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Comment:merge novem
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | dgp-properbytearray
Files: files | file ages | folders
SHA1: dcc42a5168a1babf6b3d7a4e8a07225d084ee0c2
User & Date: dgp 2017-05-19 13:23:53
Context
2017-05-23
13:05
merge novem check-in: 101f1ded72 user: dgp tags: dgp-properbytearray
2017-05-19
13:23
merge novem check-in: dcc42a5168 user: dgp tags: dgp-properbytearray
13:00
merge trunk check-in: 32225bcff4 user: dgp tags: novem
2017-05-15
18:27
merge novem check-in: 1110898196 user: dgp tags: dgp-properbytearray
Changes
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Changes to library/http/http.tcl.

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    variable $token
    upvar 0 $token state
    global errorInfo errorCode
    if {$errormsg ne ""} {
	set state(error) [list $errormsg $errorInfo $errorCode]
	set state(status) "error"
    }
    if { ($state(status) eq "timeout") 
       || ($state(status) eq "error")
       || ([info exists state(-keepalive)] && !$state(-keepalive))
       || ([info exists state(connection)] && ($state(connection) eq "close"))
    } {
        CloseSocket $state(sock) $token
    }
    if {[info exists state(after)]} {







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    variable $token
    upvar 0 $token state
    global errorInfo errorCode
    if {$errormsg ne ""} {
	set state(error) [list $errormsg $errorInfo $errorCode]
	set state(status) "error"
    }
    if { ($state(status) eq "timeout")
       || ($state(status) eq "error")
       || ([info exists state(-keepalive)] && !$state(-keepalive))
       || ([info exists state(connection)] && ($state(connection) eq "close"))
    } {
        CloseSocket $state(sock) $token
    }
    if {[info exists state(after)]} {

Changes to tests/http.test.

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    set token [http::geturl //not_a_host.tcl.tk -timeout 1000 -command \#]
    http::wait $token
    http::status $token
    # error codes vary among platforms.
} -cleanup {
    catch {http::cleanup $token}
} -returnCodes 1 -match glob -result "couldn't open socket*"
test http-1.15 {Leak with Close vs Keepalive (bug [6ca52aec14]} -body {
    set before [chan names]
    set token [http::geturl $url -headers {X-Connection keep-alive}]
    http::cleanup $token
    update
    set after [chan names]
    expr {$before eq $after}
} -result 1







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    set token [http::geturl //not_a_host.tcl.tk -timeout 1000 -command \#]
    http::wait $token
    http::status $token
    # error codes vary among platforms.
} -cleanup {
    catch {http::cleanup $token}
} -returnCodes 1 -match glob -result "couldn't open socket*"
test http-4.16 {Leak with Close vs Keepalive (bug [6ca52aec14]} -body {
    set before [chan names]
    set token [http::geturl $url -headers {X-Connection keep-alive}]
    http::cleanup $token
    update
    set after [chan names]
    expr {$before eq $after}
} -result 1

Changes to unix/Makefile.in.

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	${COMPAT_OBJS}

UNIX_OBJS = tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o \
	tclUnixFile.o tclUnixPipe.o tclUnixSock.o \
	tclUnixTime.o tclUnixInit.o tclUnixThrd.o \
	tclUnixCompat.o

NOTIFY_OBJS = tclUnixNotfy.o

MAC_OSX_OBJS = tclMacOSXBundle.o tclMacOSXFCmd.o tclMacOSXNotify.o

CYGWIN_OBJS = tclWinError.o

DTRACE_OBJ = tclDTrace.o








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	${COMPAT_OBJS}

UNIX_OBJS = tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o \
	tclUnixFile.o tclUnixPipe.o tclUnixSock.o \
	tclUnixTime.o tclUnixInit.o tclUnixThrd.o \
	tclUnixCompat.o

NOTIFY_OBJS = tclEpollNotfy.o tclKqueueNotfy.o tclSelectNotfy.o

MAC_OSX_OBJS = tclMacOSXBundle.o tclMacOSXFCmd.o tclMacOSXNotify.o

CYGWIN_OBJS = tclWinError.o

DTRACE_OBJ = tclDTrace.o

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	$(UNIX_DIR)/tclUnixTest.c \
	$(UNIX_DIR)/tclUnixThrd.c \
	$(UNIX_DIR)/tclUnixTime.c \
	$(UNIX_DIR)/tclUnixInit.c \
	$(UNIX_DIR)/tclUnixCompat.c

NOTIFY_SRCS = \
	$(UNIX_DIR)/tclUnixNotfy.c



DL_SRCS = \
	$(UNIX_DIR)/tclLoadAix.c \
	$(UNIX_DIR)/tclLoadDl.c \
	$(UNIX_DIR)/tclLoadDl2.c \
	$(UNIX_DIR)/tclLoadDld.c \
	$(UNIX_DIR)/tclLoadDyld.c \







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	$(UNIX_DIR)/tclUnixTest.c \
	$(UNIX_DIR)/tclUnixThrd.c \
	$(UNIX_DIR)/tclUnixTime.c \
	$(UNIX_DIR)/tclUnixInit.c \
	$(UNIX_DIR)/tclUnixCompat.c

NOTIFY_SRCS = \
	$(UNIX_DIR)/tclEpollNotfy.c \
	$(UNIX_DIR)/tclKqueueNotfy.c \
	$(UNIX_DIR)/tclSelectNotfy.c

DL_SRCS = \
	$(UNIX_DIR)/tclLoadAix.c \
	$(UNIX_DIR)/tclLoadDl.c \
	$(UNIX_DIR)/tclLoadDl2.c \
	$(UNIX_DIR)/tclLoadDld.c \
	$(UNIX_DIR)/tclLoadDyld.c \
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tclUnixFCmd.o: $(UNIX_DIR)/tclUnixFCmd.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFCmd.c

tclUnixFile.o: $(UNIX_DIR)/tclUnixFile.c $(FSHDR)
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFile.c

tclUnixNotfy.o: $(UNIX_DIR)/tclUnixNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixNotfy.c







tclUnixPipe.o: $(UNIX_DIR)/tclUnixPipe.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixPipe.c

tclUnixSock.o: $(UNIX_DIR)/tclUnixSock.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixSock.c








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tclUnixFCmd.o: $(UNIX_DIR)/tclUnixFCmd.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFCmd.c

tclUnixFile.o: $(UNIX_DIR)/tclUnixFile.c $(FSHDR)
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFile.c

tclEpollNotfy.o: $(UNIX_DIR)/tclEpollNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclEpollNotfy.c

tclKqueueNotfy.o: $(UNIX_DIR)/tclKqueueNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclKqueueNotfy.c

tclSelectNotfy.o: $(UNIX_DIR)/tclSelectNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclSelectNotfy.c

tclUnixPipe.o: $(UNIX_DIR)/tclUnixPipe.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixPipe.c

tclUnixSock.o: $(UNIX_DIR)/tclUnixSock.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixSock.c

Changes to unix/configure.

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		as_fn_error $? "${CC} is not a cygwin compiler." "$LINENO" 5
	    fi
	    if test "x${TCL_THREADS}" = "x0"; then
		as_fn_error $? "CYGWIN compile is only supported with --enable-threads" "$LINENO" 5
	    fi
	    do64bit_ok=yes
	    if test "x${SHARED_BUILD}" = "x1"; then
		echo "running cd ${TCL_SRC_DIR}/win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
		# The eval makes quoting arguments work.
		if cd ${TCL_SRC_DIR}/win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
		then :
		else
		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
		fi
	    fi
	    ;;
	dgux*)







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		as_fn_error $? "${CC} is not a cygwin compiler." "$LINENO" 5
	    fi
	    if test "x${TCL_THREADS}" = "x0"; then
		as_fn_error $? "CYGWIN compile is only supported with --enable-threads" "$LINENO" 5
	    fi
	    do64bit_ok=yes
	    if test "x${SHARED_BUILD}" = "x1"; then
		echo "running cd ../win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
		# The eval makes quoting arguments work.
		if cd ../win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
		then :
		else
		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
		fi
	    fi
	    ;;
	dgux*)
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	    LDFLAGS="$LDFLAGS -Wl,-Bexport"
	    CC_SEARCH_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OpenBSD-*)
	    arch=`arch -s`
	    case "$arch" in
	    vax)
		# Equivalent using configure option --disable-load
		# Step 4 will set the necessary variables
		DL_OBJS=""
		SHLIB_LD_LIBS=""
		LDFLAGS=""
		;;
	    *)
		case "$arch" in
		alpha|sparc|sparc64)
		    SHLIB_CFLAGS="-fPIC"
		    ;;
		*)
		    SHLIB_CFLAGS="-fpic"
		    ;;
		esac
		SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
		SHLIB_SUFFIX=".so"
		DL_OBJS="tclLoadDl.o"
		DL_LIBS=""
		if test $doRpath = yes; then :

		    CC_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
fi
		LD_SEARCH_FLAGS=${CC_SEARCH_FLAGS}
		SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so.${SHLIB_VERSION}'
		LDFLAGS="-Wl,-export-dynamic"
		;;
	    esac
	    case "$arch" in
	    vax)
		CFLAGS_OPTIMIZE="-O1"
		;;
	    sh)
		CFLAGS_OPTIMIZE="-O0"
		;;
	    *)
		CFLAGS_OPTIMIZE="-O2"
		;;
	    esac
	    if test "${TCL_THREADS}" = "1"; then :

		# On OpenBSD:	Compile with -pthread
		#		Don't link with -lpthread
		LIBS=`echo $LIBS | sed s/-lpthread//`
		CFLAGS="$CFLAGS -pthread"








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	    LDFLAGS="$LDFLAGS -Wl,-Bexport"
	    CC_SEARCH_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OpenBSD-*)
	    arch=`arch -s`
	    case "$arch" in









	    alpha|sparc64)
		SHLIB_CFLAGS="-fPIC"
		;;
	    *)
		SHLIB_CFLAGS="-fpic"
		;;
	    esac
	    SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
	    SHLIB_SUFFIX=".so"


	    if test $doRpath = yes; then :

		CC_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
fi
	    LD_SEARCH_FLAGS=${CC_SEARCH_FLAGS}
	    SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so${SHLIB_VERSION}'
	    LDFLAGS="-Wl,-export-dynamic"










	    CFLAGS_OPTIMIZE="-O2"


	    if test "${TCL_THREADS}" = "1"; then :

		# On OpenBSD:	Compile with -pthread
		#		Don't link with -lpthread
		LIBS=`echo $LIBS | sed s/-lpthread//`
		CFLAGS="$CFLAGS -pthread"

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    fi
fi
if test $tcl_ok = no; then

$as_echo "#define NO_FD_SET 1" >>confdefs.h

fi















































































#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------


    for ac_header in sys/time.h







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    fi
fi
if test $tcl_ok = no; then

$as_echo "#define NO_FD_SET 1" >>confdefs.h

fi

#------------------------------------------------------------------------
#	Options for the notifier. Checks for epoll(7) on Linux, and
#	kqueue(2) on {DragonFly,Free,Net,Open}BSD
#------------------------------------------------------------------------

{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for advanced notifier support" >&5
$as_echo_n "checking for advanced notifier support... " >&6; }
case x`uname -s` in
  xLinux)
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: epoll(7)" >&5
$as_echo "epoll(7)" >&6; }
	for ac_header in sys/epoll.h
do :
  ac_fn_c_check_header_mongrel "$LINENO" "sys/epoll.h" "ac_cv_header_sys_epoll_h" "$ac_includes_default"
if test "x$ac_cv_header_sys_epoll_h" = xyes; then :
  cat >>confdefs.h <<_ACEOF
#define HAVE_SYS_EPOLL_H 1
_ACEOF

$as_echo "#define NOTIFIER_EPOLL 1" >>confdefs.h

fi

done

	for ac_header in sys/eventfd.h
do :
  ac_fn_c_check_header_mongrel "$LINENO" "sys/eventfd.h" "ac_cv_header_sys_eventfd_h" "$ac_includes_default"
if test "x$ac_cv_header_sys_eventfd_h" = xyes; then :
  cat >>confdefs.h <<_ACEOF
#define HAVE_SYS_EVENTFD_H 1
_ACEOF

$as_echo "#define HAVE_EVENTFD 1" >>confdefs.h

fi

done
;;
  xDragonFlyBSD|xFreeBSD|xNetBSD|xOpenBSD)
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: kqueue(2)" >&5
$as_echo "kqueue(2)" >&6; }
	# Messy because we want to check if *all* the headers are present, and not
	# just *any*
	tcl_kqueue_headers=x
	for ac_header in sys/types.h sys/event.h sys/time.h
do :
  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
  cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
_ACEOF
 tcl_kqueue_headers=${tcl_kqueue_headers}y
fi

done

	if test $tcl_kqueue_headers = xyyy; then :


$as_echo "#define NOTIFIER_KQUEUE 1" >>confdefs.h

fi;;
  xDarwin)
	# Assume that we've got CoreFoundation present (checked elsewhere because
	# of wider impact).
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: OSX" >&5
$as_echo "OSX" >&6; };;
  *)
	cat >>confdefs.h <<_ACEOF
#define NOTIFIER_SELECT 1
_ACEOF

	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: none" >&5
$as_echo "none" >&6; };;
esac

#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------


    for ac_header in sys/time.h

Changes to unix/configure.ac.

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	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Should we include <sys/select.h>?])
	tcl_ok=yes
    fi
fi
if test $tcl_ok = no; then
    AC_DEFINE(NO_FD_SET, 1, [Do we have fd_set?])
fi
































#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------

SC_TIME_HANDLER








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	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Should we include <sys/select.h>?])
	tcl_ok=yes
    fi
fi
if test $tcl_ok = no; then
    AC_DEFINE(NO_FD_SET, 1, [Do we have fd_set?])
fi

#------------------------------------------------------------------------
#	Options for the notifier. Checks for epoll(7) on Linux, and
#	kqueue(2) on {DragonFly,Free,Net,Open}BSD
#------------------------------------------------------------------------

AC_MSG_CHECKING([for advanced notifier support])
case x`uname -s` in
  xLinux)
	AC_MSG_RESULT([epoll(7)])
	AC_CHECK_HEADERS([sys/epoll.h],
	    [AC_DEFINE(NOTIFIER_EPOLL, [1], [Is epoll(7) supported?])])
	AC_CHECK_HEADERS([sys/eventfd.h],
	    [AC_DEFINE(HAVE_EVENTFD, [1], [Is eventfd(2) supported?])]);;
  xDragonFlyBSD|xFreeBSD|xNetBSD|xOpenBSD)
	AC_MSG_RESULT([kqueue(2)])
	# Messy because we want to check if *all* the headers are present, and not
	# just *any*
	tcl_kqueue_headers=x
	AC_CHECK_HEADERS([sys/types.h sys/event.h sys/time.h],
	    [tcl_kqueue_headers=${tcl_kqueue_headers}y])
	AS_IF([test $tcl_kqueue_headers = xyyy], [
	    AC_DEFINE(NOTIFIER_KQUEUE, [1], [Is kqueue(2) supported?])]);;
  xDarwin)
	# Assume that we've got CoreFoundation present (checked elsewhere because
	# of wider impact).
	AC_MSG_RESULT([OSX]);;
  *)
	AC_DEFINE_UNQUOTED(NOTIFIER_SELECT)
	AC_MSG_RESULT([none]);;
esac

#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------

SC_TIME_HANDLER

Changes to unix/tcl.m4.

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		AC_MSG_ERROR([${CC} is not a cygwin compiler.])
	    fi
	    if test "x${TCL_THREADS}" = "x0"; then
		AC_MSG_ERROR([CYGWIN compile is only supported with --enable-threads])
	    fi
	    do64bit_ok=yes
	    if test "x${SHARED_BUILD}" = "x1"; then
		echo "running cd ${TCL_SRC_DIR}/win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
		# The eval makes quoting arguments work.
		if cd ${TCL_SRC_DIR}/win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
		then :
		else
		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
		fi
	    fi
	    ;;
	dgux*)







|

|







1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
		AC_MSG_ERROR([${CC} is not a cygwin compiler.])
	    fi
	    if test "x${TCL_THREADS}" = "x0"; then
		AC_MSG_ERROR([CYGWIN compile is only supported with --enable-threads])
	    fi
	    do64bit_ok=yes
	    if test "x${SHARED_BUILD}" = "x1"; then
		echo "running cd ../win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
		# The eval makes quoting arguments work.
		if cd ../win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
		then :
		else
		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
		fi
	    fi
	    ;;
	dgux*)
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
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	    LDFLAGS="$LDFLAGS -Wl,-Bexport"
	    CC_SEARCH_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OpenBSD-*)
	    arch=`arch -s`
	    case "$arch" in
	    vax)
		# Equivalent using configure option --disable-load
		# Step 4 will set the necessary variables
		DL_OBJS=""
		SHLIB_LD_LIBS=""
		LDFLAGS=""
		;;
	    *)
		case "$arch" in
		alpha|sparc|sparc64)
		    SHLIB_CFLAGS="-fPIC"
		    ;;
		*)
		    SHLIB_CFLAGS="-fpic"
		    ;;
		esac
		SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
		SHLIB_SUFFIX=".so"
		DL_OBJS="tclLoadDl.o"
		DL_LIBS=""
		AS_IF([test $doRpath = yes], [
		    CC_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'])
		LD_SEARCH_FLAGS=${CC_SEARCH_FLAGS}
		SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so.${SHLIB_VERSION}'
		LDFLAGS="-Wl,-export-dynamic"
		;;
	    esac
	    case "$arch" in
	    vax)
		CFLAGS_OPTIMIZE="-O1"
		;;
	    sh)
		CFLAGS_OPTIMIZE="-O0"
		;;
	    *)
		CFLAGS_OPTIMIZE="-O2"
		;;
	    esac
	    AS_IF([test "${TCL_THREADS}" = "1"], [
		# On OpenBSD:	Compile with -pthread
		#		Don't link with -lpthread
		LIBS=`echo $LIBS | sed s/-lpthread//`
		CFLAGS="$CFLAGS -pthread"
	    ])
	    # OpenBSD doesn't do version numbers with dots.







<
<
<
<
<
<
<
<
<
|
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|
|
|
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|
<
<
|
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<
<
<
<
<
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<
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|
<
<







1463
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1484


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	    LDFLAGS="$LDFLAGS -Wl,-Bexport"
	    CC_SEARCH_FLAGS=""
	    LD_SEARCH_FLAGS=""
	    ;;
	OpenBSD-*)
	    arch=`arch -s`
	    case "$arch" in









	    alpha|sparc64)
		SHLIB_CFLAGS="-fPIC"
		;;
	    *)
		SHLIB_CFLAGS="-fpic"
		;;
	    esac
	    SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
	    SHLIB_SUFFIX=".so"


	    AS_IF([test $doRpath = yes], [
		CC_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'])
	    LD_SEARCH_FLAGS=${CC_SEARCH_FLAGS}
	    SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so${SHLIB_VERSION}'
	    LDFLAGS="-Wl,-export-dynamic"










	    CFLAGS_OPTIMIZE="-O2"


	    AS_IF([test "${TCL_THREADS}" = "1"], [
		# On OpenBSD:	Compile with -pthread
		#		Don't link with -lpthread
		LIBS=`echo $LIBS | sed s/-lpthread//`
		CFLAGS="$CFLAGS -pthread"
	    ])
	    # OpenBSD doesn't do version numbers with dots.

Added unix/tclEpollNotfy.c.









































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
 * tclEpollNotfy.c --
 *
 *	This file contains the implementation of the epoll()-based
 *	Linux-specific notifier, which is the lowest-level part of the
 *	Tcl event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio AndrĂ©s Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#ifdef NOTIFIER_EPOLL

#define _GNU_SOURCE		/* For pipe2(2) */
#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <fcntl.h>
#include <signal.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/queue.h>
#include <unistd.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

struct PlatformEventData;
typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
    LIST_ENTRY(FileHandler) readyNode;
				/* Next/previous in list of FileHandlers asso-
				 * ciated with regular files (S_IFREG) that are
				 * ready for I/O. */
    struct PlatformEventData *pedPtr;
				/* Pointer to PlatformEventData associating this
				 * FileHandler with epoll(7) events. */
} FileHandler;

/*
 * The following structure associates a FileHandler and the thread that owns it
 * with the file descriptors of interest and their event masks passed to epoll_ctl(2)
 * and their corresponding event(s) returned by epoll_wait(2).
 */

struct ThreadSpecificData;
struct PlatformEventData {
    FileHandler *filePtr;
    struct ThreadSpecificData *tsdPtr;
};

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * epoll based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

LIST_HEAD(PlatformReadyFileHandlerList, FileHandler);
typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    struct PlatformReadyFileHandlerList firstReadyFileHandlerPtr;
				/* Pointer to head of list of FileHandlers
				 * associated with regular files (S_IFREG)
				 * that are ready for I/O. */
    pthread_mutex_t notifierMutex;
				/* Mutex protecting notifier termination in
				 * PlatformEventsFinalize. */
#ifdef HAVE_EVENTFD
    int triggerEventFd;		/* eventfd(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
#else
    int triggerPipe[2];		/* pipe(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
#endif /* HAVE_EVENTFD */
    int eventsFd;		/* epoll(7) file descriptor used to wait for fds */
    struct epoll_event *readyEvents;
				/* Pointer to at most maxReadyEvents events
				 * returned by epoll_wait(2). */
    size_t maxReadyEvents;	/* Count of epoll_events in readyEvents. */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

void PlatformEventsControl(FileHandler *filePtr, ThreadSpecificData *tsdPtr, int op, int isNew);
static void PlatformEventsFinalize(void);
void PlatformEventsInit(void);
static int PlatformEventsTranslate(struct epoll_event *event);
static int PlatformEventsWait(struct epoll_event *events, size_t numEvents, struct timeval *timePtr);

#include "tclUnixNotfy.c"

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	If no initNotifierProc notifier hook exists, PlatformEventsInit
 *	is called.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	PlatformEventsInit();
	return tsdPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If no finalizeNotifierProc notifier hook exists, PlatformEvents-
 *	Finalize is called.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
	PlatformEventsFinalize();
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsControl --
 *
 *	This function registers interest for the file descriptor and the mask
 *	of TCL_* bits associated with filePtr on the epoll file descriptor
 *	associated with tsdPtr.
 *	Future calls to epoll_wait will return filePtr and tsdPtr alongside with
 *	the event registered here via the PlatformEventData struct.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If adding a new file descriptor, a PlatformEventData struct will be
 *	allocated and associated with filePtr.
 *	fstat is called on the file descriptor; if it is associated with
 *	a regular file (S_IFREG,) filePtr is considered to be ready for I/O
 *	and added to or deleted from the corresponding list in tsdPtr.
 *	If it is not associated with a regular file, the file descriptor is
 *	added, modified concerning its mask of events of interest, or deleted
 *	from the epoll file descriptor of the calling thread.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsControl(
	FileHandler *filePtr,
	ThreadSpecificData *tsdPtr,
	int op,
	int isNew)
{
    struct epoll_event newEvent;
    struct PlatformEventData *newPedPtr;
    struct stat fdStat;

    newEvent.events = 0;
    if (filePtr->mask & (TCL_READABLE | TCL_EXCEPTION)) {
	newEvent.events |= EPOLLIN;
    }
    if (filePtr->mask & TCL_WRITABLE) {
	newEvent.events |= EPOLLOUT;
    }
    if (isNew) {
        newPedPtr = ckalloc(sizeof(*newPedPtr));
        newPedPtr->filePtr = filePtr;
        newPedPtr->tsdPtr = tsdPtr;
	filePtr->pedPtr = newPedPtr;
    }
    newEvent.data.ptr = filePtr->pedPtr;

    /*
     * N.B.	As discussed in Tcl_WaitForEvent(), epoll(7) does not sup-
     *		port regular files (S_IFREG.) Therefore, filePtr is in these
     *		cases simply added or deleted from the list of FileHandlers
     *		associated with regular files belonging to tsdPtr.
     */

    if (fstat(filePtr->fd, &fdStat) == -1) {
	Tcl_Panic("fstat: %s", strerror(errno));
    } else if ((fdStat.st_mode & S_IFMT) == S_IFREG) {
	switch (op) {
	case EPOLL_CTL_ADD:
	    if (isNew) {
		LIST_INSERT_HEAD(&tsdPtr->firstReadyFileHandlerPtr, filePtr, readyNode);
	    }
	    break;
	case EPOLL_CTL_DEL:
	    LIST_REMOVE(filePtr, readyNode);
	    break;
	}
	return;
   } else if (epoll_ctl(tsdPtr->eventsFd, op, filePtr->fd, &newEvent) == -1) {
	Tcl_Panic("epoll_ctl: %s", strerror(errno));
   }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsFinalize --
 *
 *	This function closes the eventfd and the epoll file descriptor and
 *	frees the epoll_event structs owned by the thread of the caller.
 *	The above operations are protected by tsdPtr->notifierMutex, which
 *	is destroyed thereafter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 * 	While tsdPtr->notifierMutex is held:
 *	The per-thread eventfd(2) is closed, if non-zero, and set to -1.
 *	The per-thread epoll(7) fd is closed, if non-zero, and set to 0.
 *	The per-thread epoll_event structs are freed, if any, and set to 0.
 *
 *	tsdPtr->notifierMutex is destroyed.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsFinalize(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    pthread_mutex_lock(&tsdPtr->notifierMutex);
#ifdef HAVE_EVENTFD
    if (tsdPtr->triggerEventFd) {
	close(tsdPtr->triggerEventFd);
	tsdPtr->triggerEventFd = -1;
    }
#else
    if (tsdPtr->triggerPipe[0]) {
	close(tsdPtr->triggerPipe[0]);
	tsdPtr->triggerPipe[0] = -1;
    }
    if (tsdPtr->triggerPipe[1]) {
	close(tsdPtr->triggerPipe[1]);
	tsdPtr->triggerPipe[1] = -1;
    }
#endif /* HAVE_EVENTFD */
    if (tsdPtr->eventsFd > 0) {
	close(tsdPtr->eventsFd);
	tsdPtr->eventsFd = 0;
    }
    if (tsdPtr->readyEvents) {
	ckfree(tsdPtr->readyEvents);
	tsdPtr->maxReadyEvents = 0;
    }
    pthread_mutex_unlock(&tsdPtr->notifierMutex);
    if ((errno = pthread_mutex_destroy(&tsdPtr->notifierMutex))) {
	Tcl_Panic("pthread_mutex_destroy: %s", strerror(errno));
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsInit --
 *
 *	This function abstracts creating a kqueue fd via the epoll_create
 *	system call and allocating memory for the epoll_event structs in
 *	tsdPtr for the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The following per-thread entities are initialised:
 *	notifierMutex is initialised.
 *	The eventfd(2) is created w/ EFD_CLOEXEC and EFD_NONBLOCK.
 *	The epoll(7) fd is created w/ EPOLL_CLOEXEC.
 *	A FileHandler struct is allocated and initialised for the event-
 *	fd(2), registering interest for TCL_READABLE on it via Platform-
 *	EventsControl().
 *	readyEvents and maxReadyEvents are initialised with 512 epoll_events.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsInit(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    FileHandler *filePtr;

    errno = pthread_mutex_init(&tsdPtr->notifierMutex, NULL);
    if (errno) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create mutex");
    }
    filePtr = ckalloc(sizeof(*filePtr));
#ifdef HAVE_EVENTFD
    if ((tsdPtr->triggerEventFd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK)) <= 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger eventfd");
    }
    filePtr->fd = tsdPtr->triggerEventFd;
#else
    if (pipe2(tsdPtr->triggerPipe, O_CLOEXEC | O_NONBLOCK) != 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger pipe");
    }
    filePtr->fd = tsdPtr->triggerPipe[0];
#endif
    if ((tsdPtr->eventsFd = epoll_create1(EPOLL_CLOEXEC)) == -1) {
	Tcl_Panic("epoll_create1: %s", strerror(errno));
    }
    filePtr->mask = TCL_READABLE;
    PlatformEventsControl(filePtr, tsdPtr, EPOLL_CTL_ADD, 1);
    if (!tsdPtr->readyEvents) {
        tsdPtr->maxReadyEvents = 512;
	tsdPtr->readyEvents = ckalloc(tsdPtr->maxReadyEvents
	    * sizeof(tsdPtr->readyEvents[0]));
    }
    LIST_INIT(&tsdPtr->firstReadyFileHandlerPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsTranslate --
 *
 *	This function translates the platform-specific mask of returned
 *	events in eventPtr to a mask of TCL_* bits.
 *
 * Results:
 *	Returns the translated mask.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsTranslate(
	struct epoll_event *eventPtr)
{
    int mask;

    mask = 0;
    if (eventPtr->events & (EPOLLIN | EPOLLHUP)) {
	mask |= TCL_READABLE;
    }
    if (eventPtr->events & EPOLLOUT) {
	mask |= TCL_WRITABLE;
    }
    if (eventPtr->events & EPOLLERR) {
	mask |= TCL_EXCEPTION;
    }
    return mask;
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsWait --
 *
 *	This function abstracts waiting for I/O events via epoll_wait.
 *
 * Results:
 *	Returns -1 if epoll_wait failed. Returns 0 if polling and if no
 *	events became available whilst polling. Returns a pointer to and
 *	the count of all returned events in all other cases.
 *
 * Side effects:
 *	gettimeofday(2), epoll_wait(2), and gettimeofday(2) are called,
 *	in the specified order.
 *	If timePtr specifies a positive value, it is updated to reflect
 *	the amount of time that has passed; if its value would {under,
 *	over}flow, it is set to zero.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsWait(
    struct epoll_event *events,
    size_t numEvents,
    struct timeval *timePtr)
{
    int numFound;
    struct timeval tv0, tv1, tv_delta;
    int timeout;

    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * If timePtr is NULL, epoll_wait(2) will wait indefinitely. If it
     * specifies a timeout of {0,0}, epoll_wait(2) will poll. Otherwise,
     * the timeout will simply be converted to milliseconds.
     */

    if (!timePtr) {
	timeout = -1;
    } else if (!timePtr->tv_sec && !timePtr->tv_usec) {
	timeout = 0;
    } else {
	timeout = (int)timePtr->tv_sec;
    }

    /*
     * Call (and possibly block on) epoll_wait(2) and substract the delta
     * of gettimeofday(2) before and after the call from timePtr if the
     * latter is not NULL. Return the number of events returned by epoll_wait(2).
     */

    gettimeofday(&tv0, NULL);
    numFound = epoll_wait(tsdPtr->eventsFd, events, (int)numEvents, timeout);
    gettimeofday(&tv1, NULL);
    if (timePtr && (timePtr->tv_sec && timePtr->tv_usec)) {
	timersub(&tv1, &tv0, &tv_delta);
	if (!timercmp(&tv_delta, timePtr, >)) {
		timersub(timePtr, &tv_delta, timePtr);
	} else {
		timePtr->tv_sec = 0;
		timePtr->tv_usec = 0;
	}
    }
    return numFound;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the epoll notifier
 *	of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *	PlatformEventsControl() is called for the new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    int isNew;

    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	    isNew = 1;
	} else {
	    isNew = 0;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	PlatformEventsControl(filePtr, tsdPtr, isNew ?
	    EPOLL_CTL_ADD : EPOLL_CTL_MOD, isNew);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file on
 *	the epoll file descriptor of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *	PlatformEventsControl() is called for the file handler structure.
 *	The PlatformEventData struct associated with the new file handler
 *	structure is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	PlatformEventsControl(filePtr, tsdPtr, EPOLL_CTL_DEL, 0);
	if (filePtr->pedPtr) {
	    ckfree(filePtr->pedPtr);
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *	The waiting logic is implemented in PlatformEventsWait.
 *
 * Results:
 *	Returns -1 if PlatformEventsWait() would block forever, otherwise
 *	returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by PlatformEventsWait().
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular epoll_wait()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound, numEvent;
	struct PlatformEventData *pedPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	int numQueued;
	ssize_t i;

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else {
	    timeoutPtr = NULL;
	}

	/*
	 * Walk the list of FileHandlers associated with regular files
	 * (S_IFREG) belonging to tsdPtr, queue Tcl events for them, and
	 * update their mask of events of interest.
	 * As epoll(7) does not support regular files, the behaviour of
	 * {select,poll}(2) is simply simulated here: fds associated with
	 * regular files are added to this list by PlatformEventsControl()
	 * and processed here before calling (and possibly blocking) on
	 * PlatformEventsWait().
	 */

	numQueued = 0;
	LIST_FOREACH(filePtr, &tsdPtr->firstReadyFileHandlerPtr, readyNode) {
	    mask = 0;
	    if (filePtr->mask & TCL_READABLE) {
		mask |= TCL_READABLE;
	    }
	    if (filePtr->mask & TCL_WRITABLE) {
		mask |= TCL_WRITABLE;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
		    ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
		numQueued++;
	    }
	    filePtr->readyMask = mask;
	}

	/*
	 * If any events were queued in the above loop, force PlatformEvents-
	 * Wait() to poll as there already are events that need to be processed
	 * at this point.
	 */

	if (numQueued) {
	    timeout.tv_sec = 0;
	    timeout.tv_usec = 0;
	    timeoutPtr = &timeout;
	}

	/*
	 * Wait or poll for new events, queue Tcl events for the FileHandlers
	 * corresponding to them, and update the FileHandlers' mask of events
	 * of interest registered by the last call to Tcl_CreateFileHandler().
	 *
	 * Events for the eventfd(2)/trigger pipe are processed here in order
	 * to facilitate inter-thread IPC. If another thread intends to wake
	 * up this thread whilst it's blocking on PlatformEventsWait(), it
	 * write(2)s to the eventfd(2)/trigger pipe (see Tcl_AlertNotifier(),)
	 * which in turn will cause PlatformEventsWait() to return immediately.
	 */

	numFound = PlatformEventsWait(tsdPtr->readyEvents, tsdPtr->maxReadyEvents, timeoutPtr);
	for (numEvent = 0; numEvent < numFound; numEvent++) {
	    pedPtr = tsdPtr->readyEvents[numEvent].data.ptr;
	    filePtr = pedPtr->filePtr;
	    mask = PlatformEventsTranslate(&tsdPtr->readyEvents[numEvent]);
#ifdef HAVE_EVENTFD
	    if (filePtr->fd == tsdPtr->triggerEventFd) {
		uint64_t eventFdVal;
		i = read(tsdPtr->triggerEventFd, &eventFdVal, sizeof(eventFdVal));
		if ((i != sizeof(eventFdVal)) && (errno != EAGAIN)) {
#else
	    if (filePtr->fd == tsdPtr->triggerPipe[0]) {
		char triggerPipeVal;
		i = read(tsdPtr->triggerPipe[0], &triggerPipeVal, sizeof(triggerPipeVal));
		if ((i != sizeof(triggerPipeVal)) && (errno != EAGAIN)) {
#endif
			Tcl_Panic("Tcl_WaitForEvent: "
				"read from %p->triggerEventFd: %s",
				(void *)tsdPtr, strerror(errno));
		} else {
		    continue;
		}
	    }
	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
	return 0;
    }
}

#endif /* !HAVE_COREFOUNDATION */

#endif /* NOTIFIER_EPOLL */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Added unix/tclKqueueNotfy.c.





















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
 * tclKqueueNotfy.c --
 *
 *	This file contains the implementation of the kqueue()-based
 *	DragonFly/Free/Net/OpenBSD-specific notifier, which is the lowest-
 *	level part of the Tcl event loop. This file works together with
 *	generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio AndrĂ©s Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#ifdef NOTIFIER_KQUEUE

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/queue.h>
#include <sys/time.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

struct PlatformEventData;
typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
    LIST_ENTRY(FileHandler) readyNode;
				/* Next/previous in list of FileHandlers asso-
				 * ciated with regular files (S_IFREG) that are
				 * ready for I/O. */
    struct PlatformEventData *pedPtr;
				/* Pointer to PlatformEventData associating this
				 * FileHandler with kevent(2) events. */
} FileHandler;

/*
 * The following structure associates a FileHandler and the thread that owns it
 * with the file descriptors of interest and their event masks passed to kevent(2)
 * and their corresponding event(s) returned by kevent(2).
 */

struct ThreadSpecificData;
struct PlatformEventData {
    FileHandler *filePtr;
    struct ThreadSpecificData *tsdPtr;
};

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * kqueue based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

LIST_HEAD(PlatformReadyFileHandlerList, FileHandler);
typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    struct PlatformReadyFileHandlerList firstReadyFileHandlerPtr;
				/* Pointer to head of list of FileHandlers
				 * associated with regular files (S_IFREG)
				 * that are ready for I/O. */
    pthread_mutex_t notifierMutex;
				/* Mutex protecting notifier termination in
				 * PlatformEventsFinalize. */
    int triggerPipe[2];		/* pipe(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
    int eventsFd;		/* kqueue(2) file descriptor used to wait for fds. */
    struct kevent *readyEvents;	/* Pointer to at most maxReadyEvents events
				 * returned by kevent(2). */
    size_t maxReadyEvents;	/* Count of kevents in readyEvents. */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

void PlatformEventsControl(FileHandler *filePtr, ThreadSpecificData *tsdPtr, int op, int isNew);
static void PlatformEventsFinalize(void);
void PlatformEventsInit(void);
static int PlatformEventsTranslate(struct kevent *eventPtr);
static int PlatformEventsWait(struct kevent *events, size_t numEvents, struct timeval *timePtr);

#include "tclUnixNotfy.c"

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	If no initNotifierProc notifier hook exists, PlatformEventsInit
 *	is called.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	PlatformEventsInit();
	return tsdPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If no finalizeNotifierProc notifier hook exists, PlatformEvents-
 *	Finalize is called.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
	PlatformEventsFinalize();
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsControl --
 *
 *	This function registers interest for the file descriptor and the mask
 *	of TCL_* bits associated with filePtr on the kqueue file descriptor
 *	associated with tsdPtr.
 *	Future calls to kevent will return filePtr and tsdPtr alongside with
 *	the event registered here via the PlatformEventData struct.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If adding a new file descriptor, a PlatformEventData struct will be
 *	allocated and associated with filePtr.
 *	fstat is called on the file descriptor; if it is associated with
 *	a regular file (S_IFREG,) filePtr is considered to be ready for I/O
 *	and added to or deleted from the corresponding list in tsdPtr.
 *	If it is not associated with a regular file, the file descriptor is
 *	added, modified concerning its mask of events of interest, or deleted
 *	from the epoll file descriptor of the calling thread.
 *	If deleting a file descriptor, kevent(2) is called twice specifying
 *	EVFILT_READ first and then EVFILT_WRITE (see note below.)
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsControl(
	FileHandler *filePtr,
	ThreadSpecificData *tsdPtr,
	int op,
	int isNew)
{
    int numChanges;
    struct kevent changeList[2];
    struct PlatformEventData *newPedPtr;
    struct stat fdStat;

    if (isNew) {
        newPedPtr = ckalloc(sizeof(*newPedPtr));
        newPedPtr->filePtr = filePtr;
        newPedPtr->tsdPtr = tsdPtr;
        filePtr->pedPtr = newPedPtr;
    }

    /*
     * N.B.	As discussed in Tcl_WaitForEvent(), kqueue(2) does not repro-
     *		duce the `always ready' {select,poll}(2) behaviour for regular
     *		files (S_IFREG) prior to FreeBSD 11.0-RELEASE. Therefore, file-
     *		Ptr is in these cases simply added or deleted from the list of
     *		FileHandlers associated with regular files belonging to tsdPtr.
     */

    if (fstat(filePtr->fd, &fdStat) == -1) {
	Tcl_Panic("fstat: %s", strerror(errno));
    } else if ((fdStat.st_mode & S_IFMT) == S_IFREG) {
	switch (op) {
	case EV_ADD:
	    if (isNew) {
		LIST_INSERT_HEAD(&tsdPtr->firstReadyFileHandlerPtr, filePtr, readyNode);
	    }
	    break;
	case EV_DELETE:
	    LIST_REMOVE(filePtr, readyNode);
	    break;
	}
	return;
    }

    numChanges = 0;
    switch (op) {
    case EV_ADD:
	if (filePtr->mask & (TCL_READABLE | TCL_EXCEPTION)) {
	    EV_SET(&changeList[numChanges], (uintptr_t)filePtr->fd, EVFILT_READ,
		op, 0, 0, filePtr->pedPtr);
	    numChanges++;
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    EV_SET(&changeList[numChanges], (uintptr_t)filePtr->fd, EVFILT_WRITE,
		op, 0, 0, filePtr->pedPtr);
	    numChanges++;
	}
        if (numChanges) {
	    if (kevent(tsdPtr->eventsFd, changeList, numChanges, NULL, 0, NULL) == -1) {
		Tcl_Panic("kevent: %s", strerror(errno));
	    }
	}
	break;
    case EV_DELETE:
	/*
	 * N.B.	kqueue(2) has separate filters for readability and writabi-
	 *		lity fd events. We therefore need to ensure that fds are
	 *		ompletely removed from the kqueue(2) fd when deleting.
	 *		This is exacerbated by changes to filePtr->mask w/o calls
	 *		to PlatforEventsControl() after e.g. an exec(3) in a child
	 *		process.
	 *		As one of these calls can fail, two separate kevent(2) calls
	 *		are made for EVFILT_{READ,WRITE}.
	 */
	EV_SET(&changeList[0], (uintptr_t)filePtr->fd, EVFILT_READ, op, 0, 0, NULL);
	if ((kevent(tsdPtr->eventsFd, changeList, 1, NULL, 0, NULL) == -1)
		&& (errno != ENOENT)) {
	    Tcl_Panic("kevent: %s", strerror(errno));
	}
	EV_SET(&changeList[0], (uintptr_t)filePtr->fd, EVFILT_WRITE, op, 0, 0, NULL);
	if ((kevent(tsdPtr->eventsFd, changeList, 1, NULL, 0, NULL) == -1)
		&& (errno != ENOENT)) {
	    Tcl_Panic("kevent: %s", strerror(errno));
	}
	break;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsFinalize --
 *
 *	This function closes the pipe and the kqueue file descriptors
 *	and frees the kevent structs owned by the thread of the caller.
 *	The above operations are protected by tsdPtr->notifierMutex, which
 *	is destroyed thereafter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 * 	While tsdPtr->notifierMutex is held:
 *	The per-thread pipe(2) fds are closed, if non-zero, and set to -1.
 *	The per-thread kqueue(2) fd is closed, if non-zero, and set to 0.
 *	The per-thread kevent structs are freed, if any, and set to 0.
 *
 *	tsdPtr->notifierMutex is destroyed.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsFinalize(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    pthread_mutex_lock(&tsdPtr->notifierMutex);
    if (tsdPtr->triggerPipe[0]) {
	close(tsdPtr->triggerPipe[0]);
	tsdPtr->triggerPipe[0] = -1;
    }
    if (tsdPtr->triggerPipe[1]) {
	close(tsdPtr->triggerPipe[1]);
	tsdPtr->triggerPipe[1] = -1;
    }
    if (tsdPtr->eventsFd > 0) {
	close(tsdPtr->eventsFd);
	tsdPtr->eventsFd = 0;
    }
    if (tsdPtr->readyEvents) {
	ckfree(tsdPtr->readyEvents);
	tsdPtr->maxReadyEvents = 0;
    }
    pthread_mutex_unlock(&tsdPtr->notifierMutex);
    if ((errno = pthread_mutex_destroy(&tsdPtr->notifierMutex))) {
	Tcl_Panic("pthread_mutex_destroy: %s", strerror(errno));
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsInit --
 *
 *	This function abstracts creating a kqueue fd via the kqueue
 *	system call and allocating memory for the kevents structs in
 *	tsdPtr for the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The following per-thread entities are initialised:
 *	notifierMutex is initialised.
 *	The pipe(2) is created; fcntl(2) is called on both fds to set
 *	FD_CLOEXEC and O_NONBLOCK.
 *	The kqueue(2) fd is created; fcntl(2) is called on it to set
 *	FD_CLOEXEC.
 *	A FileHandler struct is allocated and initialised for the event-
 *	fd(2), registering interest for TCL_READABLE on it via Platform-
 *	EventsControl().
 *	readyEvents and maxReadyEvents are initialised with 512 kevents.

 *----------------------------------------------------------------------
 */

void
PlatformEventsInit(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    int i, fdFl;
    FileHandler *filePtr;

    errno = pthread_mutex_init(&tsdPtr->notifierMutex, NULL);
    if (errno) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create mutex");
    }
    if (pipe(tsdPtr->triggerPipe) != 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger pipe");
    } else for (i = 0; i < 2; i++) {
	if (fcntl(tsdPtr->triggerPipe[i], F_SETFD, FD_CLOEXEC) == -1) {
	    Tcl_Panic("fcntl: %s", strerror(errno));
	} else {
	    fdFl = fcntl(tsdPtr->triggerPipe[i], F_GETFL);
	    fdFl |= O_NONBLOCK;
	}
	if (fcntl(tsdPtr->triggerPipe[i], F_SETFL, fdFl) == -1) {
	    Tcl_Panic("fcntl: %s", strerror(errno));
	}
    }
    if ((tsdPtr->eventsFd = kqueue()) == -1) {
	Tcl_Panic("kqueue: %s", strerror(errno));
    } else if (fcntl(tsdPtr->eventsFd, F_SETFD, FD_CLOEXEC) == -1) {
	Tcl_Panic("fcntl: %s", strerror(errno));
    }
    filePtr = ckalloc(sizeof(*filePtr));
    filePtr->fd = tsdPtr->triggerPipe[0];
    filePtr->mask = TCL_READABLE;
    PlatformEventsControl(filePtr, tsdPtr, EV_ADD, 1);
    if (!tsdPtr->readyEvents) {
        tsdPtr->maxReadyEvents = 512;
	tsdPtr->readyEvents = ckalloc(tsdPtr->maxReadyEvents
	    * sizeof(tsdPtr->readyEvents[0]));
    }
    LIST_INIT(&tsdPtr->firstReadyFileHandlerPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsTranslate --
 *
 *	This function translates the platform-specific mask of returned
 *	events in eventPtr to a mask of TCL_* bits.
 *
 * Results:
 *	Returns the translated mask.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsTranslate(
	struct kevent *eventPtr)
{
    int mask;

    mask = 0;
    if (eventPtr->filter == EVFILT_READ) {
	mask |= TCL_READABLE;
	if (eventPtr->flags & EV_ERROR) {
	    mask |= TCL_EXCEPTION;
	}
    }
    if (eventPtr->filter == EVFILT_WRITE) {
	mask |= TCL_WRITABLE;
	if (eventPtr->flags & EV_ERROR) {
	    mask |= TCL_EXCEPTION;
	}
    }
    return mask;
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsWait --
 *
 *	This function abstracts waiting for I/O events via the kevent
 *	system call.
 *
 * Results:
 *	Returns -1 if kevent failed. Returns 0 if polling and if no events
 *	became available whilst polling. Returns a pointer to and the count
 *	of all returned events in all other cases.
 *
 * Side effects:
 *	gettimeofday(2), kevent(2), and gettimeofday(2) are called,
 *	in the specified order.
 *	If timePtr specifies a positive value, it is updated to reflect
 *	the amount of time that has passed; if its value would {under,
 *	over}flow, it is set to zero.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsWait(
    struct kevent *events,
    size_t numEvents,
    struct timeval *timePtr)
{
    int numFound;
    struct timeval tv0, tv1, tv_delta;
    struct timespec timeout, *timeoutPtr;

    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * If timePtr is NULL, kevent(2) will wait indefinitely. If it speci-
     * fies a timeout of {0,0}, kevent(2) will poll. Otherwise, the time-
     * out will simply be converted to a timespec.
     */

    if (!timePtr) {
	timeoutPtr = NULL;
    } else if (!timePtr->tv_sec && !timePtr->tv_usec) {
	timeout.tv_sec = 0;
	timeout.tv_nsec = 0;
	timeoutPtr = &timeout;
    } else {
	timeout.tv_sec = timePtr->tv_sec;
	timeout.tv_nsec = timePtr->tv_usec * 1000;
	timeoutPtr = &timeout;
    }

    /*
     * Call (and possibly block on) kevent(2) and substract the delta of
     * gettimeofday(2) before and after the call from timePtr if the latter
     * is not NULL. Return the number of events returned by kevent(2).
     */

    gettimeofday(&tv0, NULL);
    numFound = kevent(tsdPtr->eventsFd, NULL, 0, events, (int)numEvents, timeoutPtr);
    gettimeofday(&tv1, NULL);
    if (timePtr && (timePtr->tv_sec && timePtr->tv_usec)) {
	timersub(&tv1, &tv0, &tv_delta);
	if (!timercmp(&tv_delta, timePtr, >)) {
		timersub(timePtr, &tv_delta, timePtr);
	} else {
		timePtr->tv_sec = 0;
		timePtr->tv_usec = 0;
	}
    }
    return numFound;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the kqueue notifier
 *	of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *	PlatformEventsControl() is called for the new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    int isNew;

    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	    isNew = 1;
	} else {
	    isNew = 0;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	PlatformEventsControl(filePtr, tsdPtr, EV_ADD, isNew);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file on
 *	the kqueue of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *	PlatformEventsControl() is called for the file handler structure.
 *	The PlatformEventData struct associated with the new file handler
 *	structure is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	PlatformEventsControl(filePtr, tsdPtr, EV_DELETE, 0);
	if (filePtr->pedPtr) {
	    ckfree(filePtr->pedPtr);
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *	The waiting logic is implemented in PlatformEventsWait.
 *
 * Results:
 *	Returns -1 if PlatformEventsWait() would block forever, otherwise
 *	returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by PlatformEventsWait().
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular epoll_wait()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound, numEvent;
	struct PlatformEventData *pedPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	int numQueued;
	ssize_t i;
	char buf[1];

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else {
	    timeoutPtr = NULL;
	}

	/*
	 * Walk the list of FileHandlers associated with regular files
	 * (S_IFREG) belonging to tsdPtr, queue Tcl events for them, and
	 * update their mask of events of interest.
	 * kqueue(2), unlike epoll(7), does support regular files, but
	 * EVFILT_READ only `[r]eturns when the file pointer is not at
	 * the end of file' as opposed to unconditionally. While FreeBSD
	 * 11.0-RELEASE adds support for this mode (NOTE_FILE_POLL,) this
	 * is not used for reasons of compatibility.
	 * Therefore, the behaviour of {select,poll}(2) is simply simulated
	 * here: fds associated with regular files are added to this list by
	 * PlatformEventsControl() and processed here before calling (and
	 * possibly blocking) on PlatformEventsWait().
	 */

	numQueued = 0;
	LIST_FOREACH(filePtr, &tsdPtr->firstReadyFileHandlerPtr, readyNode) {
	    mask = 0;
	    if (filePtr->mask & TCL_READABLE) {
		mask |= TCL_READABLE;
	    }
	    if (filePtr->mask & TCL_WRITABLE) {
		mask |= TCL_WRITABLE;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
		    ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
		numQueued++;
	    }
	    filePtr->readyMask = mask;
	}

	/*
	 * If any events were queued in the above loop, force PlatformEvents-
	 * Wait() to poll as there already are events that need to be processed
	 * at this point.
	 */

	if (numQueued) {
	    timeout.tv_sec = 0;
	    timeout.tv_usec = 0;
	    timeoutPtr = &timeout;
	}

	/*
	 * Wait or poll for new events, queue Tcl events for the FileHandlers
	 * corresponding to them, and update the FileHandlers' mask of events
	 * of interest registered by the last call to Tcl_CreateFileHandler().
	 *
	 * Events for the trigger pipe are processed here in order to facilitate
	 * inter-thread IPC. If another thread intends to wake up this thread
	 * whilst it's blocking on PlatformEventsWait(), it write(2)s to the
	 * other end of the pipe (see Tcl_AlertNotifier(),) which in turn will
	 * cause PlatformEventsWait() to return immediately.
	 */

	numFound = PlatformEventsWait(tsdPtr->readyEvents, tsdPtr->maxReadyEvents, timeoutPtr);
	for (numEvent = 0; numEvent < numFound; numEvent++) {
	    pedPtr = (struct PlatformEventData *)tsdPtr->readyEvents[numEvent].udata;
	    filePtr = pedPtr->filePtr;
	    mask = PlatformEventsTranslate(&tsdPtr->readyEvents[numEvent]);
	    if (filePtr->fd == tsdPtr->triggerPipe[0]) {
		do {
		    i = read(tsdPtr->triggerPipe[0], buf, 1);
		    if ((i == -1) && (errno != EAGAIN)) {
			Tcl_Panic("Tcl_WaitForEvent: "
				"read from %p->triggerPipe: %s",
				(void *)tsdPtr, strerror(errno));
		    } else {
			break;
		    }
		} while (1);
		continue;
	    }
	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask |= mask;
	}
	return 0;
    }
}

#endif /* !HAVE_COREFOUNDATION */

#endif /* NOTIFIER_KQUEUE */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Added unix/tclSelectNotfy.c.



























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
 * tclSelectNotfy.c --
 *
 *	This file contains the implementation of the select()-based
 *	generic Unix notifier, which is the lowest-level part of the
 *	Tcl event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#if !defined(NOTIFIER_EPOLL) && !defined(NOTIFIER_KQUEUE)

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
} FileHandler;

/*
 * The following structure contains a set of select() masks to track readable,
 * writable, and exception conditions.
 */

typedef struct {
    fd_set readable;
    fd_set writable;
    fd_set exception;
} SelectMasks;

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * select based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    SelectMasks checkMasks;	/* This structure is used to build up the
				 * masks to be used in the next call to
				 * select. Bits are set in response to calls
				 * to Tcl_CreateFileHandler. */
    SelectMasks readyMasks;	/* This array reflects the readable/writable
				 * conditions that were found to exist by the
				 * last call to select. */
    int numFdBits;		/* Number of valid bits in checkMasks (one
				 * more than highest fd for which
				 * Tcl_WatchFile has been called). */
#ifdef TCL_THREADS
    int onList;			/* True if it is in this list */
    unsigned int pollState;	/* pollState is used to implement a polling
				 * handshake between each thread and the
				 * notifier thread. Bits defined below. */
    struct ThreadSpecificData *nextPtr, *prevPtr;
				/* All threads that are currently waiting on
				 * an event have their ThreadSpecificData
				 * structure on a doubly-linked listed formed
				 * from these pointers. You must hold the
				 * notifierMutex lock before accessing these
				 * fields. */
#ifdef __CYGWIN__
    void *event;     /* Any other thread alerts a notifier
	 * that an event is ready to be processed
	 * by sending this event. */
    void *hwnd;			/* Messaging window. */
#else /* !__CYGWIN__ */
    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
#endif /* __CYGWIN__ */
    int waitCVinitialized;	/* Variable to flag initialization of the structure */
    int eventReady;		/* True if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif /* TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

#ifdef TCL_THREADS
/*
 * The following static indicates the number of threads that have initialized
 * notifiers.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */

static int notifierCount = 0;

/*
 * The following variable points to the head of a doubly-linked list of
 * ThreadSpecificData structures for all threads that are currently waiting on
 * an event.
 *
 * You must hold the notifierMutex lock before accessing this list.
 */

static ThreadSpecificData *waitingListPtr = NULL;

/*
 * The notifier thread spends all its time in select() waiting for a file
 * descriptor associated with one of the threads on the waitingListPtr list to
 * do something interesting. But if the contents of the waitingListPtr list
 * ever changes, we need to wake up and restart the select() system call. You
 * can wake up the notifier thread by writing a single byte to the file
 * descriptor defined below. This file descriptor is the input-end of a pipe
 * and the notifier thread is listening for data on the output-end of the same
 * pipe. Hence writing to this file descriptor will cause the select() system
 * call to return and wake up the notifier thread.
 *
 * You must hold the notifierMutex lock before writing to the pipe.
 */

static int triggerPipe = -1;

/*
 * The notifierMutex locks access to all of the global notifier state.
 */

static pthread_mutex_t notifierInitMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t notifierMutex     = PTHREAD_MUTEX_INITIALIZER;
/*
 * The following static indicates if the notifier thread is running.
 *
 * You must hold the notifierInitMutex before accessing this variable.
 */

static int notifierThreadRunning = 0;

/*
 * The notifier thread signals the notifierCV when it has finished
 * initializing the triggerPipe and right before the notifier thread
 * terminates.
 */

static pthread_cond_t notifierCV = PTHREAD_COND_INITIALIZER;

/*
 * The pollState bits
 *	POLL_WANT is set by each thread before it waits on its condition
 *		variable. It is checked by the notifier before it does select.
 *	POLL_DONE is set by the notifier if it goes into select after seeing
 *		POLL_WANT. The idea is to ensure it tries a select with the
 *		same bits the initial thread had set.
 */

#define POLL_WANT	0x1
#define POLL_DONE	0x2

/*
 * This is the thread ID of the notifier thread that does select.
 */

static Tcl_ThreadId notifierThread;
#endif /* TCL_THREADS */

/*
 * Static routines defined in this file.
 */

#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)
static int	atForkInit = 0;
static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */
static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);

/*
 * Import of Windows API when building threaded with Cygwin.
 */

#if defined(TCL_THREADS) && defined(__CYGWIN__)
typedef struct {
    void *hwnd;
    unsigned int *message;
    int wParam;
    int lParam;
    int time;
    int x;
    int y;
} MSG;

typedef struct {
    unsigned int style;
    void *lpfnWndProc;
    int cbClsExtra;
    int cbWndExtra;
    void *hInstance;
    void *hIcon;
    void *hCursor;
    void *hbrBackground;
    void *lpszMenuName;
    const void *lpszClassName;
} WNDCLASS;

extern void __stdcall	CloseHandle(void *);
extern void *__stdcall	CreateEventW(void *, unsigned char, unsigned char,
			    void *);
extern void * __stdcall	CreateWindowExW(void *, const void *, const void *,
			    DWORD, int, int, int, int, void *, void *, void *, void *);
extern DWORD __stdcall	DefWindowProcW(void *, int, void *, void *);
extern unsigned char __stdcall	DestroyWindow(void *);
extern int __stdcall	DispatchMessageW(const MSG *);
extern unsigned char __stdcall	GetMessageW(MSG *, void *, int, int);
extern void __stdcall	MsgWaitForMultipleObjects(DWORD, void *,
			    unsigned char, DWORD, DWORD);
extern unsigned char __stdcall	PeekMessageW(MSG *, void *, int, int, int);
extern unsigned char __stdcall	PostMessageW(void *, unsigned int, void *,
				    void *);
extern void __stdcall	PostQuitMessage(int);
extern void *__stdcall	RegisterClassW(const WNDCLASS *);
extern unsigned char __stdcall	ResetEvent(void *);
extern unsigned char __stdcall	TranslateMessage(const MSG *);

/*
 * Threaded-cygwin specific constants and functions in this file:
 */

static const WCHAR className[] = L"TclNotifier";
static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
			    void *wParam, void *lParam);
#endif /* TCL_THREADS && __CYGWIN__ */


#include "tclUnixNotfy.c"

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

#ifdef TCL_THREADS
	tsdPtr->eventReady = 0;

	/*
	 * Initialize thread specific condition variable for this thread.
	 */
	if (tsdPtr->waitCVinitialized == 0) {
#ifdef __CYGWIN__
	    WNDCLASS class;

	    class.style = 0;
	    class.cbClsExtra = 0;
	    class.cbWndExtra = 0;
	    class.hInstance = TclWinGetTclInstance();
	    class.hbrBackground = NULL;
	    class.lpszMenuName = NULL;
	    class.lpszClassName = className;
	    class.lpfnWndProc = NotifierProc;
	    class.hIcon = NULL;
	    class.hCursor = NULL;

	    RegisterClassW(&class);
	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
		    0 /* !signaled */, NULL);
#else
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif /* __CYGWIN__ */
	    tsdPtr->waitCVinitialized = 1;
	}

	pthread_mutex_lock(&notifierInitMutex);
#if defined(HAVE_PTHREAD_ATFORK)
	/*
	 * Install pthread_atfork handlers to clean up the notifier in the
	 * child of a fork.
	 */

	if (!atForkInit) {
	    int result = pthread_atfork(NULL, NULL, AtForkChild);

	    if (result) {
		Tcl_Panic("Tcl_InitNotifier: pthread_atfork failed");
	    }
	    atForkInit = 1;
	}
#endif /* HAVE_PTHREAD_ATFORK */

	notifierCount++;

	pthread_mutex_unlock(&notifierInitMutex);

#endif /* TCL_THREADS */
	return tsdPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May terminate the background notifier thread if this is the last
 *	notifier instance.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	pthread_mutex_lock(&notifierInitMutex);
	notifierCount--;

	/*
	 * If this is the last thread to use the notifier, close the notifier
	 * pipe and wait for the background thread to terminate.
	 */

	if (notifierCount == 0) {

	    if (triggerPipe != -1) {
		if (write(triggerPipe, "q", 1) != 1) {
		    Tcl_Panic("Tcl_FinalizeNotifier: %s",
			    "unable to write q to triggerPipe");
		}
		close(triggerPipe);
		pthread_mutex_lock(&notifierMutex);
		while(triggerPipe != -1) {
		    pthread_cond_wait(&notifierCV, &notifierMutex);
		}
		pthread_mutex_unlock(&notifierMutex);
		if (notifierThreadRunning) {
		    int result = pthread_join((pthread_t) notifierThread, NULL);

		    if (result) {
			Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier "
				"thread");
		    }
		    notifierThreadRunning = 0;
		}
	    }
	}

	/*
	 * Clean up any synchronization objects in the thread local storage.
	 */

#ifdef __CYGWIN__
	DestroyWindow(tsdPtr->hwnd);
	CloseHandle(tsdPtr->event);
#else /* __CYGWIN__ */
	pthread_cond_destroy(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	tsdPtr->waitCVinitialized = 0;

	pthread_mutex_unlock(&notifierInitMutex);
#endif /* TCL_THREADS */
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the select notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	/*
	 * Update the check masks for this file.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.readable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.writable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &tsdPtr->checkMasks.exception);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}
	if (tsdPtr->numFdBits <= fd) {
	    tsdPtr->numFdBits = fd+1;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	int i;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	if (filePtr->mask & TCL_READABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (filePtr->mask & TCL_EXCEPTION) {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}

	/*
	 * Find current max fd.
	 */

	if (fd+1 == tsdPtr->numFdBits) {
	    int numFdBits = 0;

	    for (i = fd-1; i >= 0; i--) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.writable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    numFdBits = i+1;
		    break;
		}
	    }
	    tsdPtr->numFdBits = numFdBits;
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}

#if defined(TCL_THREADS) && defined(__CYGWIN__)

static DWORD __stdcall
NotifierProc(
    void *hwnd,
    unsigned int message,
    void *wParam,
    void *lParam)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (message != 1024) {
	return DefWindowProcW(hwnd, message, wParam, lParam);
    }

    /*
     * Process all of the runnable events.
     */

    tsdPtr->eventReady = 1;
    Tcl_ServiceAll();
    return 0;
}
#endif /* TCL_THREADS && __CYGWIN__ */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *
 * Results:
 *	Returns -1 if the select would block forever, otherwise returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by the select.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
#ifdef TCL_THREADS
	int waitForFiles;
#   ifdef __CYGWIN__
	MSG msg;
#   endif /* __CYGWIN__ */
#else
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular select()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound;
#endif /* TCL_THREADS */
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
#ifndef TCL_THREADS
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else if (tsdPtr->numFdBits == 0) {
	    /*
	     * If there are no threads, no timeout, and no fds registered,
	     * then there are no events possible and we must avoid deadlock.
	     * Note that this is not entirely correct because there might be a
	     * signal that could interrupt the select call, but we don't
	     * handle that case if we aren't using threads.
	     */

	    return -1;
	} else {
	    timeoutPtr = NULL;
#endif /* !TCL_THREADS */
	}

#ifdef TCL_THREADS
	/*
	 * Start notifier thread and place this thread on the list of
	 * interested threads, signal the notifier thread, and wait for a
	 * response or a timeout.
	 */
	StartNotifierThread("Tcl_WaitForEvent");

	pthread_mutex_lock(&notifierMutex);

	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
#if defined(__APPLE__) && defined(__LP64__)
		/*
		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have
		 * a bug that causes it to wait forever when passed an
		 * absolute time which has already been exceeded by the system
		 * time; as a workaround, when given a very brief timeout,
		 * just do a poll. [Bug 1457797]
		 */
		|| timePtr->usec < 10
#endif /* __APPLE__ && __LP64__ */
		)) {
	    /*
	     * Cannot emulate a polling select with a polling condition
	     * variable. Instead, pretend to wait for files and tell the
	     * notifier thread what we are doing. The notifier thread makes
	     * sure it goes through select with its select mask in the same
	     * state as ours currently is. We block until that happens.
	     */

	    waitForFiles = 1;
	    tsdPtr->pollState = POLL_WANT;
	    timePtr = NULL;
	} else {
	    waitForFiles = (tsdPtr->numFdBits > 0);
	    tsdPtr->pollState = 0;
	}

	if (waitForFiles) {
	    /*
	     * Add the ThreadSpecificData structure of this thread to the list
	     * of ThreadSpecificData structures of all threads that are
	     * waiting on file events.
	     */

	    tsdPtr->nextPtr = waitingListPtr;
	    if (waitingListPtr) {
		waitingListPtr->prevPtr = tsdPtr;
	    }
	    tsdPtr->prevPtr = 0;
	    waitingListPtr = tsdPtr;
	    tsdPtr->onList = 1;

	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

	FD_ZERO(&tsdPtr->readyMasks.readable);
	FD_ZERO(&tsdPtr->readyMasks.writable);
	FD_ZERO(&tsdPtr->readyMasks.exception);

	if (!tsdPtr->eventReady) {
#ifdef __CYGWIN__
	    if (!PeekMessageW(&msg, NULL, 0, 0, 0)) {
		DWORD timeout;

		if (timePtr) {
		    timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
		} else {
		    timeout = 0xFFFFFFFF;
		}
		pthread_mutex_unlock(&notifierMutex);
		MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279);
		pthread_mutex_lock(&notifierMutex);
	    }
#else
	    if (timePtr != NULL) {
	       Tcl_Time now;
	       struct timespec ptime;

	       Tcl_GetTime(&now);
	       ptime.tv_sec = timePtr->sec + now.sec + (timePtr->usec + now.usec) / 1000000;
	       ptime.tv_nsec = 1000 * ((timePtr->usec + now.usec) % 1000000);

	       pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex, &ptime);
	    } else {
	       pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
	    }
#endif /* __CYGWIN__ */
	}
	tsdPtr->eventReady = 0;

#ifdef __CYGWIN__
	while (PeekMessageW(&msg, NULL, 0, 0, 0)) {
	    /*
	     * Retrieve and dispatch the message.
	     */

	    DWORD result = GetMessageW(&msg, NULL, 0, 0);

	    if (result == 0) {
		PostQuitMessage(msg.wParam);
		/* What to do here? */
	    } else if (result != (DWORD) -1) {
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	    }
	}
	ResetEvent(tsdPtr->event);
#endif /* __CYGWIN__ */

	if (waitForFiles && tsdPtr->onList) {
	    /*
	     * Remove the ThreadSpecificData structure of this thread from the
	     * waiting list. Alert the notifier thread to recompute its select
	     * masks - skipping this caused a hang when trying to close a pipe
	     * which the notifier thread was still doing a select on.
	     */

	    if (tsdPtr->prevPtr) {
		tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
	    } else {
		waitingListPtr = tsdPtr->nextPtr;
	    }
	    if (tsdPtr->nextPtr) {
		tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
	    }
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	    tsdPtr->onList = 0;
	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

#else
	tsdPtr->readyMasks = tsdPtr->checkMasks;
	numFound = select(tsdPtr->numFdBits, &tsdPtr->readyMasks.readable,
		&tsdPtr->readyMasks.writable, &tsdPtr->readyMasks.exception,
		timeoutPtr);

	/*
	 * Some systems don't clear the masks after an error, so we have to do
	 * it here.
	 */

	if (numFound == -1) {
	    FD_ZERO(&tsdPtr->readyMasks.readable);
	    FD_ZERO(&tsdPtr->readyMasks.writable);
	    FD_ZERO(&tsdPtr->readyMasks.exception);
	}
#endif /* TCL_THREADS */

	/*
	 * Queue all detected file events before returning.
	 */

	for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL);
		filePtr = filePtr->nextPtr) {
	    mask = 0;
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.readable)) {
		mask |= TCL_READABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.writable)) {
		mask |= TCL_WRITABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.exception)) {
		mask |= TCL_EXCEPTION;
	    }

	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
#ifdef TCL_THREADS
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
	return 0;
    }
}

#ifdef TCL_THREADS

/*
 *----------------------------------------------------------------------
 *
 * NotifierThreadProc --
 *
 *	This routine is the initial (and only) function executed by the
 *	special notifier thread. Its job is to wait for file descriptors to
 *	become readable or writable or to have an exception condition and then
 *	to notify other threads who are interested in this information by
 *	signalling a condition variable. Other threads can signal this
 *	notifier thread of a change in their interests by writing a single
 *	byte to a special pipe that the notifier thread is monitoring.
 *
 * Result:
 *	None. Once started, this routine never exits. It dies with the overall
 *	process.
 *
 * Side effects:
 *	The trigger pipe used to signal the notifier thread is created when
 *	the notifier thread first starts.
 *
 *----------------------------------------------------------------------
 */

static TCL_NORETURN void
NotifierThreadProc(
    ClientData clientData)	/* Not used. */
{
    ThreadSpecificData *tsdPtr;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;
    int i;
    int fds[2], receivePipe;
    long found;
    struct timeval poll = {0., 0.}, *timePtr;
    char buf[2];
    int numFdBits = 0;

    if (pipe(fds) != 0) {
	Tcl_Panic("NotifierThreadProc: %s", "could not create trigger pipe");
    }

    receivePipe = fds[0];

    if (TclUnixSetBlockingMode(receivePipe, TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe non blocking");
    }
    if (TclUnixSetBlockingMode(fds[1], TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe non blocking");
    }
    if (fcntl(receivePipe, F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe close-on-exec");
    }
    if (fcntl(fds[1], F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe close-on-exec");
    }

    /*
     * Install the write end of the pipe into the global variable.
     */

    pthread_mutex_lock(&notifierMutex);
    triggerPipe = fds[1];

    /*
     * Signal any threads that are waiting.
     */

    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    /*
     * Look for file events and report them to interested threads.
     */

    while (1) {
	FD_ZERO(&readableMask);
	FD_ZERO(&writableMask);
	FD_ZERO(&exceptionMask);

	/*
	 * Compute the logical OR of the masks from all the waiting
	 * notifiers.
	 */

	pthread_mutex_lock(&notifierMutex);
	timePtr = NULL;
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)) {
		    FD_SET(i, &readableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)) {
		    FD_SET(i, &writableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    FD_SET(i, &exceptionMask);
		}
	    }
	    if (tsdPtr->numFdBits > numFdBits) {
		numFdBits = tsdPtr->numFdBits;
	    }
	    if (tsdPtr->pollState & POLL_WANT) {
		/*
		 * Here we make sure we go through select() with the same mask
		 * bits that were present when the thread tried to poll.
		 */

		tsdPtr->pollState |= POLL_DONE;
		timePtr = &poll;
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Set up the mask to include the receive pipe.
	 */

	if (receivePipe >= numFdBits) {
	    numFdBits = receivePipe + 1;
	}
	FD_SET(receivePipe, &readableMask);

	if (select(numFdBits, &readableMask, &writableMask, &exceptionMask,
		timePtr) == -1) {
	    /*
	     * Try again immediately on an error.
	     */

	    continue;
	}

	/*
	 * Alert any threads that are waiting on a ready file descriptor.
	 */

	pthread_mutex_lock(&notifierMutex);
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    found = 0;

	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			&& FD_ISSET(i, &readableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.readable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)
			&& FD_ISSET(i, &writableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.writable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)
			&& FD_ISSET(i, &exceptionMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.exception);
		    found = 1;
		}
	    }

	    if (found || (tsdPtr->pollState & POLL_DONE)) {
		AlertSingleThread(tsdPtr);
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Consume the next byte from the notifier pipe if the pipe was
	 * readable. Note that there may be multiple bytes pending, but to
	 * avoid a race condition we only read one at a time.
	 */

	do {
	    i = read(receivePipe, buf, 1);
	    if (i <= 0) {
		break;
	    } else if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) {
		/*
		 * Someone closed the write end of the pipe or sent us a Quit
		 * message [Bug: 4139] and then closed the write end of the
		 * pipe so we need to shut down the notifier thread.
		 */

		break;
	    }
	} while (1);
	if ((i == 0) || (buf[0] == 'q')) {
	    break;
	}
    }

    /*
     * Clean up the read end of the pipe and signal any threads waiting on
     * termination of the notifier thread.
     */

    close(receivePipe);
    pthread_mutex_lock(&notifierMutex);
    triggerPipe = -1;
    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    TclpThreadExit(0);
}

#endif /* TCL_THREADS */

#endif /* !HAVE_COREFOUNDATION */

#endif /* !NOTIFIER_EPOLL && !NOTIFIER_KQUEUE */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Changes to unix/tclUnixChan.c.

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    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "\"%s\" cannot be used to get a FILE *", chanID));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
	    NULL);
    return TCL_ERROR;
}

#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
/*
 *----------------------------------------------------------------------
 *
 * TclUnixWaitForFile --
 *
 *	This function waits synchronously for a file to become readable or
 *	writable, with an optional timeout.
 *
 * Results:
 *	The return value is an OR'ed combination of TCL_READABLE,
 *	TCL_WRITABLE, and TCL_EXCEPTION, indicating the conditions that are
 *	present on file at the time of the return. This function will not
 *	return until either "timeout" milliseconds have elapsed or at least
 *	one of the conditions given by mask has occurred for file (a return
 *	value of 0 means that a timeout occurred). No normal events will be
 *	serviced during the execution of this function.
 *
 * Side effects:
 *	Time passes.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixWaitForFile(
    int fd,			/* Handle for file on which to wait. */
    int mask,			/* What to wait for: OR'ed combination of
				 * TCL_READABLE, TCL_WRITABLE, and
				 * TCL_EXCEPTION. */
    int timeout)		/* Maximum amount of time to wait for one of
				 * the conditions in mask to occur, in
				 * milliseconds. A value of 0 means don't wait
				 * at all, and a value of -1 means wait
				 * forever. */
{
    Tcl_Time abortTime = {0, 0}, now; /* silence gcc 4 warning */
    struct timeval blockTime, *timeoutPtr;
    int numFound, result = 0;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;

#ifndef _DARWIN_C_SOURCE
    /*
     * Sanity check fd.
     */

    if (fd >= FD_SETSIZE) {
	Tcl_Panic("TclUnixWaitForFile can't handle file id %d", fd);
	/* must never get here, or select masks overrun will occur below */
    }
#endif

    /*
     * If there is a non-zero finite timeout, compute the time when we give
     * up.
     */

    if (timeout > 0) {
	Tcl_GetTime(&now);
	abortTime.sec = now.sec + timeout/1000;
	abortTime.usec = now.usec + (timeout%1000)*1000;
	if (abortTime.usec >= 1000000) {
	    abortTime.usec -= 1000000;
	    abortTime.sec += 1;
	}
	timeoutPtr = &blockTime;
    } else if (timeout == 0) {
	timeoutPtr = &blockTime;
	blockTime.tv_sec = 0;
	blockTime.tv_usec = 0;
    } else {
	timeoutPtr = NULL;
    }

    /*
     * Initialize the select masks.
     */

    FD_ZERO(&readableMask);
    FD_ZERO(&writableMask);
    FD_ZERO(&exceptionMask);

    /*
     * Loop in a mini-event loop of our own, waiting for either the file to
     * become ready or a timeout to occur.
     */

    while (1) {
	if (timeout > 0) {
	    blockTime.tv_sec = abortTime.sec - now.sec;
	    blockTime.tv_usec = abortTime.usec - now.usec;
	    if (blockTime.tv_usec < 0) {
		blockTime.tv_sec -= 1;
		blockTime.tv_usec += 1000000;
	    }
	    if (blockTime.tv_sec < 0) {
		blockTime.tv_sec = 0;
		blockTime.tv_usec = 0;
	    }
	}

	/*
	 * Setup the select masks for the fd.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &readableMask);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &writableMask);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &exceptionMask);
	}

	/*
	 * Wait for the event or a timeout.
	 */

	numFound = select(fd + 1, &readableMask, &writableMask,
		&exceptionMask, timeoutPtr);
	if (numFound == 1) {
	    if (FD_ISSET(fd, &readableMask)) {
		SET_BITS(result, TCL_READABLE);
	    }
	    if (FD_ISSET(fd, &writableMask)) {
		SET_BITS(result, TCL_WRITABLE);
	    }
	    if (FD_ISSET(fd, &exceptionMask)) {
		SET_BITS(result, TCL_EXCEPTION);
	    }
	    result &= mask;
	    if (result) {
		break;
	    }
	}
	if (timeout == 0) {
	    break;
	}
	if (timeout < 0) {
	    continue;
	}

	/*
	 * The select returned early, so we need to recompute the timeout.
	 */

	Tcl_GetTime(&now);
	if ((abortTime.sec < now.sec)
		|| (abortTime.sec==now.sec && abortTime.usec<=now.usec)) {
	    break;
	}
    }
    return result;
}
#endif /* HAVE_COREFOUNDATION */

/*
 *----------------------------------------------------------------------
 *
 * FileTruncateProc --
 *
 *	Truncates a file to a given length.
 *







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    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "\"%s\" cannot be used to get a FILE *", chanID));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
	    NULL);
    return TCL_ERROR;
}

































































































































































/*
 *----------------------------------------------------------------------
 *
 * FileTruncateProc --
 *
 *	Truncates a file to a given length.
 *

Changes to unix/tclUnixNotfy.c.

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/*
 * tclUnixNotfy.c --
 *
 *	This file contains the implementation of the select()-based
 *	Unix-specific notifier, which is the lowest-level part of the Tcl
 *	event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.

 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
} FileHandler;

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following structure contains a set of select() masks to track readable,
 * writable, and exception conditions.
 */

typedef struct {
    fd_set readable;
    fd_set writable;
    fd_set exception;
} SelectMasks;

/*
 * The following static structure contains the state information for the
 * select based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    SelectMasks checkMasks;	/* This structure is used to build up the
				 * masks to be used in the next call to
				 * select. Bits are set in response to calls
				 * to Tcl_CreateFileHandler. */
    SelectMasks readyMasks;	/* This array reflects the readable/writable
				 * conditions that were found to exist by the
				 * last call to select. */
    int numFdBits;		/* Number of valid bits in checkMasks (one
				 * more than highest fd for which
				 * Tcl_WatchFile has been called). */
#ifdef TCL_THREADS
    int onList;			/* True if it is in this list */
    unsigned int pollState;	/* pollState is used to implement a polling
				 * handshake between each thread and the
				 * notifier thread. Bits defined below. */
    struct ThreadSpecificData *nextPtr, *prevPtr;
				/* All threads that are currently waiting on
				 * an event have their ThreadSpecificData
				 * structure on a doubly-linked listed formed
				 * from these pointers. You must hold the
				 * notifierMutex lock before accessing these
				 * fields. */
#ifdef __CYGWIN__
    void *event;     /* Any other thread alerts a notifier
	 * that an event is ready to be processed
	 * by sending this event. */
    void *hwnd;			/* Messaging window. */
#else /* !__CYGWIN__ */
    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
#endif /* __CYGWIN__ */
    int waitCVinitialized;	/* Variable to flag initialization of the structure */
    int eventReady;		/* True if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif /* TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

#ifdef TCL_THREADS
/*
 * The following static indicates the number of threads that have initialized
 * notifiers.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */

static int notifierCount = 0;

/*
 * The following variable points to the head of a doubly-linked list of
 * ThreadSpecificData structures for all threads that are currently waiting on
 * an event.
 *
 * You must hold the notifierMutex lock before accessing this list.
 */

static ThreadSpecificData *waitingListPtr = NULL;

/*
 * The notifier thread spends all its time in select() waiting for a file
 * descriptor associated with one of the threads on the waitingListPtr list to
 * do something interesting. But if the contents of the waitingListPtr list
 * ever changes, we need to wake up and restart the select() system call. You
 * can wake up the notifier thread by writing a single byte to the file
 * descriptor defined below. This file descriptor is the input-end of a pipe
 * and the notifier thread is listening for data on the output-end of the same
 * pipe. Hence writing to this file descriptor will cause the select() system
 * call to return and wake up the notifier thread.
 *
 * You must hold the notifierMutex lock before writing to the pipe.
 */

static int triggerPipe = -1;

/*
 * The notifierMutex locks access to all of the global notifier state.
 */

static pthread_mutex_t notifierInitMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t notifierMutex     = PTHREAD_MUTEX_INITIALIZER;
/*
 * The following static indicates if the notifier thread is running.
 *
 * You must hold the notifierInitMutex before accessing this variable.
 */

static int notifierThreadRunning = 0;

/*
 * The notifier thread signals the notifierCV when it has finished
 * initializing the triggerPipe and right before the notifier thread
 * terminates.
 */

static pthread_cond_t notifierCV = PTHREAD_COND_INITIALIZER;

/*
 * The pollState bits
 *	POLL_WANT is set by each thread before it waits on its condition
 *		variable. It is checked by the notifier before it does select.
 *	POLL_DONE is set by the notifier if it goes into select after seeing
 *		POLL_WANT. The idea is to ensure it tries a select with the
 *		same bits the initial thread had set.
 */

#define POLL_WANT	0x1
#define POLL_DONE	0x2

/*
 * This is the thread ID of the notifier thread that does select.
 */

static Tcl_ThreadId notifierThread;

#endif /* TCL_THREADS */

/*
 * Static routines defined in this file.
 */


#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)
static int	atForkInit = 0;
static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */

static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);

/*
 * Import of Windows API when building threaded with Cygwin.
 */

#if defined(TCL_THREADS) && defined(__CYGWIN__)
typedef struct {
    void *hwnd;
    unsigned int *message;
    int wParam;
    int lParam;
    int time;
    int x;
    int y;
} MSG;

typedef struct {
    unsigned int style;
    void *lpfnWndProc;
    int cbClsExtra;
    int cbWndExtra;
    void *hInstance;
    void *hIcon;
    void *hCursor;
    void *hbrBackground;
    void *lpszMenuName;
    const void *lpszClassName;
} WNDCLASS;

extern void __stdcall	CloseHandle(void *);
extern void *__stdcall	CreateEventW(void *, unsigned char, unsigned char,
			    void *);
extern void * __stdcall	CreateWindowExW(void *, const void *, const void *,
			    DWORD, int, int, int, int, void *, void *, void *, void *);
extern DWORD __stdcall	DefWindowProcW(void *, int, void *, void *);
extern unsigned char __stdcall	DestroyWindow(void *);
extern int __stdcall	DispatchMessageW(const MSG *);
extern unsigned char __stdcall	GetMessageW(MSG *, void *, int, int);
extern void __stdcall	MsgWaitForMultipleObjects(DWORD, void *,
			    unsigned char, DWORD, DWORD);
extern unsigned char __stdcall	PeekMessageW(MSG *, void *, int, int, int);
extern unsigned char __stdcall	PostMessageW(void *, unsigned int, void *,
				    void *);
extern void __stdcall	PostQuitMessage(int);
extern void *__stdcall	RegisterClassW(const WNDCLASS *);
extern unsigned char __stdcall	ResetEvent(void *);
extern unsigned char __stdcall	TranslateMessage(const MSG *);

/*
 * Threaded-cygwin specific constants and functions in this file:
 */

static const WCHAR className[] = L"TclNotifier";
static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
			    void *wParam, void *lParam);
#endif /* TCL_THREADS && __CYGWIN__ */

#if TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * StartNotifierThread --
 *
 *	Start a notfier thread and wait for the notifier pipe to be created.



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/*
 * tclUnixNotfy.c --
 *
 *	This file contains subroutines shared by all notifier backend
 *	implementations on *nix platforms.

 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio AndrĂ©s Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */




#include <poll.h>













































































































































































/*
 * Static routines defined in this file.
 */

#ifdef NOTIFIER_SELECT
#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)

static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */
#endif /* NOTIFIER_SELECT */
static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);




#ifdef NOTIFIER_SELECT




















































#if TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * StartNotifierThread --
 *
 *	Start a notfier thread and wait for the notifier pipe to be created.
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	    notifierThreadRunning = 1;
	}
	pthread_mutex_unlock(&notifierInitMutex);
    }
}
#endif /* TCL_THREADS */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

#ifdef TCL_THREADS
	tsdPtr->eventReady = 0;

	/*
	 * Initialize thread specific condition variable for this thread.
	 */
	if (tsdPtr->waitCVinitialized == 0) {
#ifdef __CYGWIN__
	    WNDCLASS class;

	    class.style = 0;
	    class.cbClsExtra = 0;
	    class.cbWndExtra = 0;
	    class.hInstance = TclWinGetTclInstance();
	    class.hbrBackground = NULL;
	    class.lpszMenuName = NULL;
	    class.lpszClassName = className;
	    class.lpfnWndProc = NotifierProc;
	    class.hIcon = NULL;
	    class.hCursor = NULL;

	    RegisterClassW(&class);
	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
		    0 /* !signaled */, NULL);
#else
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif /* __CYGWIN__ */
	    tsdPtr->waitCVinitialized = 1;
	}

	pthread_mutex_lock(&notifierInitMutex);
#if defined(HAVE_PTHREAD_ATFORK)
	/*
	 * Install pthread_atfork handlers to clean up the notifier in the
	 * child of a fork.
	 */

	if (!atForkInit) {
	    int result = pthread_atfork(NULL, NULL, AtForkChild);

	    if (result) {
		Tcl_Panic("Tcl_InitNotifier: pthread_atfork failed");
	    }
	    atForkInit = 1;
	}
#endif /* HAVE_PTHREAD_ATFORK */

	notifierCount++;

	pthread_mutex_unlock(&notifierInitMutex);

#endif /* TCL_THREADS */
	return tsdPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May terminate the background notifier thread if this is the last
 *	notifier instance.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	pthread_mutex_lock(&notifierInitMutex);
	notifierCount--;

	/*
	 * If this is the last thread to use the notifier, close the notifier
	 * pipe and wait for the background thread to terminate.
	 */

	if (notifierCount == 0) {

	    if (triggerPipe != -1) {
		if (write(triggerPipe, "q", 1) != 1) {
		    Tcl_Panic("Tcl_FinalizeNotifier: %s",
			    "unable to write q to triggerPipe");
		}
		close(triggerPipe);
		pthread_mutex_lock(&notifierMutex);
		while(triggerPipe != -1) {
		    pthread_cond_wait(&notifierCV, &notifierMutex);
		}
		pthread_mutex_unlock(&notifierMutex);
		if (notifierThreadRunning) {
		    int result = pthread_join((pthread_t) notifierThread, NULL);

		    if (result) {
			Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier "
				"thread");
		    }
		    notifierThreadRunning = 0;
		}
	    }
	}

	/*
	 * Clean up any synchronization objects in the thread local storage.
	 */

#ifdef __CYGWIN__
	DestroyWindow(tsdPtr->hwnd);
	CloseHandle(tsdPtr->event);
#else /* __CYGWIN__ */
	pthread_cond_destroy(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	tsdPtr->waitCVinitialized = 0;

	pthread_mutex_unlock(&notifierInitMutex);
#endif /* TCL_THREADS */
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AlertNotifier --
 *
 *	Wake up the specified notifier from any thread. This routine is called
 *	by the platform independent notifier code whenever the Tcl_ThreadAlert
 *	routine is called. This routine is guaranteed not to be called on a
 *	given notifier after Tcl_FinalizeNotifier is called for that notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:

 *	Signals the notifier condition variable for the specified notifier.





 *
 *----------------------------------------------------------------------
 */

void
Tcl_AlertNotifier(
    ClientData clientData)
{
    if (tclNotifierHooks.alertNotifierProc) {
	tclNotifierHooks.alertNotifierProc(clientData);
	return;
    } else {

#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = clientData;

	pthread_mutex_lock(&notifierMutex);
	tsdPtr->eventReady = 1;

#   ifdef __CYGWIN__
	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#   else
	pthread_cond_broadcast(&tsdPtr->waitCV);
#   endif /* __CYGWIN__ */
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */















    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetTimer --







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	    notifierThreadRunning = 1;
	}
	pthread_mutex_unlock(&notifierInitMutex);
    }
}
#endif /* TCL_THREADS */






















































#endif /* NOTIFIER_SELECT */












































































































/*
 *----------------------------------------------------------------------
 *
 * Tcl_AlertNotifier --
 *
 *	Wake up the specified notifier from any thread. This routine is called
 *	by the platform independent notifier code whenever the Tcl_ThreadAlert
 *	routine is called. This routine is guaranteed not to be called on a
 *	given notifier after Tcl_FinalizeNotifier is called for that notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	select(2) notifier:
 *		signals the notifier condition variable for the specified
 *		notifier.
 *	epoll(7) notifier:
 *		write(2)s to the eventfd(2) of the specified thread.
 *	kqueue(2) notifier:
 *		write(2)s to the trigger pipe(2) of the specified thread.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AlertNotifier(
    ClientData clientData)
{
    if (tclNotifierHooks.alertNotifierProc) {
	tclNotifierHooks.alertNotifierProc(clientData);
	return;
    } else {
#ifdef NOTIFIER_SELECT
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = clientData;

	pthread_mutex_lock(&notifierMutex);
	tsdPtr->eventReady = 1;

#   ifdef __CYGWIN__
	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#   else
	pthread_cond_broadcast(&tsdPtr->waitCV);
#   endif /* __CYGWIN__ */
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
#else
	ThreadSpecificData *tsdPtr = clientData;
#if defined(NOTIFIER_EPOLL) && defined(HAVE_EVENTFD)
	uint64_t eventFdVal = 1;
	if (write(tsdPtr->triggerEventFd, &eventFdVal,
		sizeof(eventFdVal)) != sizeof(eventFdVal)) {
	    Tcl_Panic("Tcl_AlertNotifier: unable to write to %p->triggerEventFd",
		(void *)tsdPtr);
#else
	if (write(tsdPtr->triggerPipe[1], "", 1) != 1) {
	    Tcl_Panic("Tcl_AlertNotifier: unable to write to %p->triggerPipe",
		(void *)tsdPtr);
#endif /* NOTIFIER_EPOLL && HAVE_EVENTFD */
	}
#endif /* NOTIFIER_SELECT */
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetTimer --
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    int mode)			/* Either TCL_SERVICE_ALL, or
				 * TCL_SERVICE_NONE. */
{
    if (tclNotifierHooks.serviceModeHookProc) {
	tclNotifierHooks.serviceModeHookProc(mode);
	return;
    } else if (mode == TCL_SERVICE_ALL) {

#if TCL_THREADS
	StartNotifierThread("Tcl_ServiceModeHook");
#endif
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the select notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	/*
	 * Update the check masks for this file.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.readable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.writable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &tsdPtr->checkMasks.exception);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}
	if (tsdPtr->numFdBits <= fd) {
	    tsdPtr->numFdBits = fd+1;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	int i;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	if (filePtr->mask & TCL_READABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (filePtr->mask & TCL_EXCEPTION) {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}

	/*
	 * Find current max fd.
	 */

	if (fd+1 == tsdPtr->numFdBits) {
	    int numFdBits = 0;

	    for (i = fd-1; i >= 0; i--) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.writable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    numFdBits = i+1;
		    break;
		}
	    }
	    tsdPtr->numFdBits = numFdBits;
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * FileHandlerEventProc --







>



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    int mode)			/* Either TCL_SERVICE_ALL, or
				 * TCL_SERVICE_NONE. */
{
    if (tclNotifierHooks.serviceModeHookProc) {
	tclNotifierHooks.serviceModeHookProc(mode);
	return;
    } else if (mode == TCL_SERVICE_ALL) {
#ifdef NOTIFIER_SELECT
#if TCL_THREADS
	StartNotifierThread("Tcl_ServiceModeHook");
#endif


#endif /* NOTIFIER_SELECT */

































































































































































    }
}

/*
 *----------------------------------------------------------------------
 *
 * FileHandlerEventProc --
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	    filePtr->proc(filePtr->clientData, mask);
	}
	break;
    }
    return 1;
}

#if defined(TCL_THREADS) && defined(__CYGWIN__)

static DWORD __stdcall
NotifierProc(
    void *hwnd,
    unsigned int message,
    void *wParam,
    void *lParam)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (message != 1024) {
	return DefWindowProcW(hwnd, message, wParam, lParam);
    }

    /*
     * Process all of the runnable events.
     */

    tsdPtr->eventReady = 1;
    Tcl_ServiceAll();
    return 0;
}
#endif /* TCL_THREADS && __CYGWIN__ */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *
 * Results:
 *	Returns -1 if the select would block forever, otherwise returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by the select.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
#ifdef TCL_THREADS
	int waitForFiles;
#   ifdef __CYGWIN__
	MSG msg;
#   endif /* __CYGWIN__ */
#else
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular select()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound;
#endif /* TCL_THREADS */
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
#ifndef TCL_THREADS
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else if (tsdPtr->numFdBits == 0) {
	    /*
	     * If there are no threads, no timeout, and no fds registered,
	     * then there are no events possible and we must avoid deadlock.
	     * Note that this is not entirely correct because there might be a
	     * signal that could interrupt the select call, but we don't
	     * handle that case if we aren't using threads.
	     */

	    return -1;
	} else {
	    timeoutPtr = NULL;
#endif /* !TCL_THREADS */
	}

#ifdef TCL_THREADS
	/*
	 * Start notifier thread and place this thread on the list of
	 * interested threads, signal the notifier thread, and wait for a
	 * response or a timeout.
	 */
	StartNotifierThread("Tcl_WaitForEvent");

	pthread_mutex_lock(&notifierMutex);

	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
#if defined(__APPLE__) && defined(__LP64__)
		/*
		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have
		 * a bug that causes it to wait forever when passed an
		 * absolute time which has already been exceeded by the system
		 * time; as a workaround, when given a very brief timeout,
		 * just do a poll. [Bug 1457797]
		 */
		|| timePtr->usec < 10
#endif /* __APPLE__ && __LP64__ */
		)) {
	    /*
	     * Cannot emulate a polling select with a polling condition
	     * variable. Instead, pretend to wait for files and tell the
	     * notifier thread what we are doing. The notifier thread makes
	     * sure it goes through select with its select mask in the same
	     * state as ours currently is. We block until that happens.
	     */

	    waitForFiles = 1;
	    tsdPtr->pollState = POLL_WANT;
	    timePtr = NULL;
	} else {
	    waitForFiles = (tsdPtr->numFdBits > 0);
	    tsdPtr->pollState = 0;
	}

	if (waitForFiles) {
	    /*
	     * Add the ThreadSpecificData structure of this thread to the list
	     * of ThreadSpecificData structures of all threads that are
	     * waiting on file events.
	     */

	    tsdPtr->nextPtr = waitingListPtr;
	    if (waitingListPtr) {
		waitingListPtr->prevPtr = tsdPtr;
	    }
	    tsdPtr->prevPtr = 0;
	    waitingListPtr = tsdPtr;
	    tsdPtr->onList = 1;

	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

	FD_ZERO(&tsdPtr->readyMasks.readable);
	FD_ZERO(&tsdPtr->readyMasks.writable);
	FD_ZERO(&tsdPtr->readyMasks.exception);

	if (!tsdPtr->eventReady) {
#ifdef __CYGWIN__
	    if (!PeekMessageW(&msg, NULL, 0, 0, 0)) {
		DWORD timeout;

		if (timePtr) {
		    timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
		} else {
		    timeout = 0xFFFFFFFF;
		}
		pthread_mutex_unlock(&notifierMutex);
		MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279);
		pthread_mutex_lock(&notifierMutex);
	    }
#else
	    if (timePtr != NULL) {
	       Tcl_Time now;
	       struct timespec ptime;

	       Tcl_GetTime(&now);
	       ptime.tv_sec = timePtr->sec + now.sec + (timePtr->usec + now.usec) / 1000000;
	       ptime.tv_nsec = 1000 * ((timePtr->usec + now.usec) % 1000000);

	       pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex, &ptime);
	    } else {
	       pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
	    }
#endif /* __CYGWIN__ */
	}
	tsdPtr->eventReady = 0;

#ifdef __CYGWIN__
	while (PeekMessageW(&msg, NULL, 0, 0, 0)) {
	    /*
	     * Retrieve and dispatch the message.
	     */

	    DWORD result = GetMessageW(&msg, NULL, 0, 0);

	    if (result == 0) {
		PostQuitMessage(msg.wParam);
		/* What to do here? */
	    } else if (result != (DWORD) -1) {
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	    }
	}
	ResetEvent(tsdPtr->event);
#endif /* __CYGWIN__ */

	if (waitForFiles && tsdPtr->onList) {
	    /*
	     * Remove the ThreadSpecificData structure of this thread from the
	     * waiting list. Alert the notifier thread to recompute its select
	     * masks - skipping this caused a hang when trying to close a pipe
	     * which the notifier thread was still doing a select on.
	     */

	    if (tsdPtr->prevPtr) {
		tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
	    } else {
		waitingListPtr = tsdPtr->nextPtr;
	    }
	    if (tsdPtr->nextPtr) {
		tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
	    }
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	    tsdPtr->onList = 0;
	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

#else
	tsdPtr->readyMasks = tsdPtr->checkMasks;
	numFound = select(tsdPtr->numFdBits, &tsdPtr->readyMasks.readable,
		&tsdPtr->readyMasks.writable, &tsdPtr->readyMasks.exception,
		timeoutPtr);

	/*
	 * Some systems don't clear the masks after an error, so we have to do
	 * it here.
	 */

	if (numFound == -1) {
	    FD_ZERO(&tsdPtr->readyMasks.readable);
	    FD_ZERO(&tsdPtr->readyMasks.writable);
	    FD_ZERO(&tsdPtr->readyMasks.exception);
	}
#endif /* TCL_THREADS */

	/*
	 * Queue all detected file events before returning.
	 */

	for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL);
		filePtr = filePtr->nextPtr) {
	    mask = 0;
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.readable)) {
		mask |= TCL_READABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.writable)) {
		mask |= TCL_WRITABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.exception)) {
		mask |= TCL_EXCEPTION;
	    }

	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
#ifdef TCL_THREADS
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
	return 0;
    }
}

#ifdef TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * NotifierThreadProc --
 *
 *	This routine is the initial (and only) function executed by the
 *	special notifier thread. Its job is to wait for file descriptors to
 *	become readable or writable or to have an exception condition and then
 *	to notify other threads who are interested in this information by
 *	signalling a condition variable. Other threads can signal this
 *	notifier thread of a change in their interests by writing a single
 *	byte to a special pipe that the notifier thread is monitoring.
 *
 * Result:
 *	None. Once started, this routine never exits. It dies with the overall
 *	process.
 *
 * Side effects:
 *	The trigger pipe used to signal the notifier thread is created when
 *	the notifier thread first starts.
 *
 *----------------------------------------------------------------------
 */

static TCL_NORETURN void
NotifierThreadProc(
    ClientData clientData)	/* Not used. */
{
    ThreadSpecificData *tsdPtr;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;
    int fds[2];
    int i, numFdBits = 0, receivePipe;
    long found;
    struct timeval poll = {0., 0.}, *timePtr;
    char buf[2];

    if (pipe(fds) != 0) {
	Tcl_Panic("NotifierThreadProc: %s", "could not create trigger pipe");
    }

    receivePipe = fds[0];

    if (TclUnixSetBlockingMode(receivePipe, TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe non blocking");
    }
    if (TclUnixSetBlockingMode(fds[1], TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe non blocking");
    }
    if (fcntl(receivePipe, F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe close-on-exec");
    }
    if (fcntl(fds[1], F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe close-on-exec");
    }

    /*
     * Install the write end of the pipe into the global variable.
     */

    pthread_mutex_lock(&notifierMutex);
    triggerPipe = fds[1];

    /*
     * Signal any threads that are waiting.
     */

    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    /*
     * Look for file events and report them to interested threads.
     */

    while (1) {
	FD_ZERO(&readableMask);
	FD_ZERO(&writableMask);
	FD_ZERO(&exceptionMask);

	/*
	 * Compute the logical OR of the select masks from all the waiting
	 * notifiers.
	 */

	pthread_mutex_lock(&notifierMutex);
	timePtr = NULL;
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)) {
		    FD_SET(i, &readableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)) {
		    FD_SET(i, &writableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    FD_SET(i, &exceptionMask);
		}
	    }
	    if (tsdPtr->numFdBits > numFdBits) {
		numFdBits = tsdPtr->numFdBits;
	    }
	    if (tsdPtr->pollState & POLL_WANT) {
		/*
		 * Here we make sure we go through select() with the same mask
		 * bits that were present when the thread tried to poll.
		 */

		tsdPtr->pollState |= POLL_DONE;
		timePtr = &poll;
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Set up the select mask to include the receive pipe.
	 */

	if (receivePipe >= numFdBits) {
	    numFdBits = receivePipe + 1;
	}
	FD_SET(receivePipe, &readableMask);

	if (select(numFdBits, &readableMask, &writableMask, &exceptionMask,
		timePtr) == -1) {
	    /*
	     * Try again immediately on an error.
	     */

	    continue;
	}

	/*
	 * Alert any threads that are waiting on a ready file descriptor.
	 */

	pthread_mutex_lock(&notifierMutex);
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    found = 0;

	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			&& FD_ISSET(i, &readableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.readable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)
			&& FD_ISSET(i, &writableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.writable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)
			&& FD_ISSET(i, &exceptionMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.exception);
		    found = 1;
		}
	    }

	    if (found || (tsdPtr->pollState & POLL_DONE)) {
		tsdPtr->eventReady = 1;
		if (tsdPtr->onList) {
		    /*
		     * Remove the ThreadSpecificData structure of this thread
		     * from the waiting list. This prevents us from
		     * continuously spining on select until the other threads
		     * runs and services the file event.
		     */

		    if (tsdPtr->prevPtr) {
			tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
		    } else {
			waitingListPtr = tsdPtr->nextPtr;
		    }
		    if (tsdPtr->nextPtr) {
			tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
		    }
		    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
		    tsdPtr->onList = 0;
		    tsdPtr->pollState = 0;
		}
#ifdef __CYGWIN__
		PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#else /* __CYGWIN__ */
		pthread_cond_broadcast(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Consume the next byte from the notifier pipe if the pipe was
	 * readable. Note that there may be multiple bytes pending, but to
	 * avoid a race condition we only read one at a time.
	 */

	if (FD_ISSET(receivePipe, &readableMask)) {
	    i = read(receivePipe, buf, 1);

	    if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) {
		/*
		 * Someone closed the write end of the pipe or sent us a Quit
		 * message [Bug: 4139] and then closed the write end of the
		 * pipe so we need to shut down the notifier thread.
		 */

		break;
	    }
	}
    }

    /*
     * Clean up the read end of the pipe and signal any threads waiting on
     * termination of the notifier thread.
     */

    close(receivePipe);
    pthread_mutex_lock(&notifierMutex);
    triggerPipe = -1;
    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    TclpThreadExit(0);
}

#if defined(HAVE_PTHREAD_ATFORK)
/*
 *----------------------------------------------------------------------
 *
 * AtForkChild --







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	    filePtr->proc(filePtr->clientData, mask);
	}
	break;
    }
    return 1;
}


#ifdef NOTIFIER_SELECT





















#ifdef TCL_THREADS

/*
 *----------------------------------------------------------------------
 *














 * AlertSingleThread --





















 *




 *	Notify a single thread that is waiting on a file descriptor to become





 *	readable or writable or to have an exception condition.




























































 *	notifierMutex must be held.







 *






 * Result:







 *	None.





 *



 * Side effects:




 *	The condition variable associated with the thread is broadcasted.













 *



 *----------------------------------------------------------------------












 */




























































































































static void
AlertSingleThread(


	ThreadSpecificData *tsdPtr)








{





























































































































    tsdPtr->eventReady = 1;
    if (tsdPtr->onList) {
        /*
         * Remove the ThreadSpecificData structure of this thread
         * from the waiting list. This prevents us from
         * continuously spinning on epoll_wait until the other
         * threads runs and services the file event.
         */

        if (tsdPtr->prevPtr) {
    	    tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
        } else {
    	    waitingListPtr = tsdPtr->nextPtr;
        }
        if (tsdPtr->nextPtr) {
    	    tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
        }
        tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
        tsdPtr->onList = 0;
        tsdPtr->pollState = 0;
    }
#ifdef __CYGWIN__
    PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#else /* __CYGWIN__ */
    pthread_cond_broadcast(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */





































}

#if defined(HAVE_PTHREAD_ATFORK)
/*
 *----------------------------------------------------------------------
 *
 * AtForkChild --
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		    className, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    ResetEvent(tsdPtr->event);
#else
	    pthread_cond_destroy(&tsdPtr->waitCV);
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif

	    /*
	     * In case, we had multiple threads running before the fork,
	     * make sure, we don't try to reach out to their thread local data.
	     */
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;

	    /*
	     * The list of registered event handlers at fork time is in
	     * tsdPtr->firstFileHandlerPtr;
	     */
	}
    }

    Tcl_InitNotifier();
}
#endif /* HAVE_PTHREAD_ATFORK */

#endif /* TCL_THREADS */






















































































































































#endif /* !HAVE_COREFOUNDATION */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */







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		    className, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    ResetEvent(tsdPtr->event);
#else
	    pthread_cond_destroy(&tsdPtr->waitCV);
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif

	    /*
	     * In case, we had multiple threads running before the fork,
	     * make sure, we don't try to reach out to their thread local data.
	     */
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;

	    /*
	     * The list of registered event handlers at fork time is in
	     * tsdPtr->firstFileHandlerPtr;
	     */
	}
    }

    Tcl_InitNotifier();
}
#endif /* HAVE_PTHREAD_ATFORK */

#endif /* TCL_THREADS */

#endif /* NOTIFIER_SELECT */
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
/*
 *----------------------------------------------------------------------
 *
 * TclUnixWaitForFile --
 *
 *	This function waits synchronously for a file to become readable or
 *	writable, with an optional timeout.
 *
 * Results:
 *	The return value is an OR'ed combination of TCL_READABLE,
 *	TCL_WRITABLE, and TCL_EXCEPTION, indicating the conditions that are
 *	present on file at the time of the return. This function will not
 *	return until either "timeout" milliseconds have elapsed or at least
 *	one of the conditions given by mask has occurred for file (a return
 *	value of 0 means that a timeout occurred). No normal events will be
 *	serviced during the execution of this function.
 *
 * Side effects:
 *	Time passes.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixWaitForFile(
    int fd,			/* Handle for file on which to wait. */
    int mask,			/* What to wait for: OR'ed combination of
				 * TCL_READABLE, TCL_WRITABLE, and
				 * TCL_EXCEPTION. */
    int timeout)		/* Maximum amount of time to wait for one of
				 * the conditions in mask to occur, in
				 * milliseconds. A value of 0 means don't wait
				 * at all, and a value of -1 means wait
				 * forever. */
{
    Tcl_Time abortTime = {0, 0}, now; /* silence gcc 4 warning */
    struct timeval blockTime, *timeoutPtr;
    struct pollfd pollFds[1];
    int numFound, result = 0, pollTimeout;

    /*
     * If there is a non-zero finite timeout, compute the time when we give
     * up.
     */

    if (timeout > 0) {
	Tcl_GetTime(&now);
	abortTime.sec = now.sec + timeout/1000;
	abortTime.usec = now.usec + (timeout%1000)*1000;
	if (abortTime.usec >= 1000000) {
	    abortTime.usec -= 1000000;
	    abortTime.sec += 1;
	}
	timeoutPtr = &blockTime;
    } else if (timeout == 0) {
	timeoutPtr = &blockTime;
	blockTime.tv_sec = 0;
	blockTime.tv_usec = 0;
    } else {
	timeoutPtr = NULL;
    }

    /*
     * Setup the pollfd structure for the fd.
     */

    pollFds[0].fd = fd;
    pollFds[0].events = pollFds[0].revents = 0;
    if (mask & TCL_READABLE) {
	pollFds[0].events |= (POLLIN | POLLHUP);
    }
    if (mask & TCL_WRITABLE) {
	pollFds[0].events |= POLLOUT;
    }
    if (mask & TCL_EXCEPTION) {
	pollFds[0].events |= POLLERR;
    }

    /*
     * Loop in a mini-event loop of our own, waiting for either the file to
     * become ready or a timeout to occur.
     */

    while (1) {
	if (timeout > 0) {
	    blockTime.tv_sec = abortTime.sec - now.sec;
	    blockTime.tv_usec = abortTime.usec - now.usec;
	    if (blockTime.tv_usec < 0) {
		blockTime.tv_sec -= 1;
		blockTime.tv_usec += 1000000;
	    }
	    if (blockTime.tv_sec < 0) {
		blockTime.tv_sec = 0;
		blockTime.tv_usec = 0;
	    }
	}

	/*
	 * Wait for the event or a timeout.
	 */

	if (!timeoutPtr) {
	    pollTimeout = -1;
	} else if (!timeoutPtr->tv_sec && !timeoutPtr->tv_usec) {
	    pollTimeout = 0;
	} else {
	    pollTimeout = (int)timeoutPtr->tv_sec * 1000;
	    if (timeoutPtr->tv_usec) {
		pollTimeout += ((int)timeoutPtr->tv_usec / 1000);
	    }
	}
	numFound = poll(pollFds, 1, pollTimeout);
	if (numFound == 1) {
	    result = 0;
	    if (pollFds[0].events & (POLLIN | POLLHUP)) {
		result |= TCL_READABLE;
	    }
	    if (pollFds[0].events & POLLOUT) {
		result |= TCL_WRITABLE;
	    }
	    if (pollFds[0].events & POLLERR) {
		result |= TCL_EXCEPTION;
	    }
	    if (result) {
		break;
	    }
	}
	if (timeout == 0) {
	    break;
	}
	if (timeout < 0) {
	    continue;
	}

	/*
	 * The select returned early, so we need to recompute the timeout.
	 */

	Tcl_GetTime(&now);
	if ((abortTime.sec < now.sec)
		|| (abortTime.sec==now.sec && abortTime.usec<=now.usec)) {
	    break;
	}
    }
    return result;
}
#endif /* !HAVE_COREFOUNDATION */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */