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Overview
Comment: | TIP #458 implementation: Add Support for epoll() and kqueue() in the Notifier |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
858569fb0484a15478f8583287a263ac |
User & Date: | jan.nijtmans 2017-05-18 12:33:15 |
Context
2017-05-18
| ||
13:27 | merge core-8-6-branch check-in: 91616b46d8 user: jan.nijtmans tags: trunk | |
12:36 | merge trunk check-in: 8295a7cc33 user: jan.nijtmans tags: novem | |
12:33 | TIP #458 implementation: Add Support for epoll() and kqueue() in the Notifier check-in: 858569fb04 user: jan.nijtmans tags: trunk | |
12:09 | autoconf-2.59 check-in: 74228b692b user: dgp tags: core-8-6-branch | |
09:24 | merge core-8-6-branch check-in: 66276befa2 user: jan.nijtmans tags: trunk | |
2017-05-04
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14:51 | merge trunk Closed-Leaf check-in: 50be45e71e user: dgp tags: tip-458 | |
Changes
Changes to unix/Makefile.in.
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341 342 343 344 345 346 347 | ${COMPAT_OBJS} UNIX_OBJS = tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o \ tclUnixFile.o tclUnixPipe.o tclUnixSock.o \ tclUnixTime.o tclUnixInit.o tclUnixThrd.o \ tclUnixCompat.o | | | 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 | ${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 |
︙ | ︙ | |||
561 562 563 564 565 566 567 | $(UNIX_DIR)/tclUnixTest.c \ $(UNIX_DIR)/tclUnixThrd.c \ $(UNIX_DIR)/tclUnixTime.c \ $(UNIX_DIR)/tclUnixInit.c \ $(UNIX_DIR)/tclUnixCompat.c NOTIFY_SRCS = \ | | > > | 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 | $(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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1555 1556 1557 1558 1559 1560 1561 | 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 | | | > > > > > > | 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 | 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 |
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Changes to unix/configure.
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8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 | 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 | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454 8455 8456 8457 8458 8459 8460 8461 8462 8463 8464 8465 8466 8467 8468 8469 8470 8471 8472 8473 8474 8475 8476 8477 8478 8479 8480 8481 8482 8483 8484 8485 8486 8487 8488 8489 8490 8491 8492 8493 8494 8495 8496 8497 8498 8499 8500 8501 8502 | 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 |
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Changes to unix/configure.ac.
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295 296 297 298 299 300 301 302 303 304 305 306 307 308 | 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 | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 | 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 |
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Added unix/tclEpollNotfy.c.
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This file works together with generic/tclNotify.c. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright (c) 2016 Lucio Andrés 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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606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 | /* * 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 Andrés 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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969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 | /* * 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(¬ifierInitMutex); #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(¬ifierInitMutex); #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(¬ifierInitMutex); 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(¬ifierMutex); while(triggerPipe != -1) { pthread_cond_wait(¬ifierCV, ¬ifierMutex); } pthread_mutex_unlock(¬ifierMutex); 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(¬ifierInitMutex); #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(¬ifierMutex); 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(¬ifierMutex); MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279); pthread_mutex_lock(¬ifierMutex); } #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, ¬ifierMutex, &ptime); } else { pthread_cond_wait(&tsdPtr->waitCV, ¬ifierMutex); } #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(¬ifierMutex); #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(¬ifierMutex); triggerPipe = fds[1]; /* * Signal any threads that are waiting. */ pthread_cond_broadcast(¬ifierCV); pthread_mutex_unlock(¬ifierMutex); /* * 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(¬ifierMutex); 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(¬ifierMutex); /* * 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(¬ifierMutex); 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(¬ifierMutex); /* * 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(¬ifierMutex); triggerPipe = -1; pthread_cond_broadcast(¬ifierCV); pthread_mutex_unlock(¬ifierMutex); 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.
︙ | ︙ | |||
1721 1722 1723 1724 1725 1726 1727 | 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; } | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 | 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.
1 2 3 | /* * tclUnixNotfy.c -- * | | | < > < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < > < > < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | /* * 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 Andrés 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. |
︙ | ︙ | |||
296 297 298 299 300 301 302 | notifierThreadRunning = 1; } pthread_mutex_unlock(¬ifierInitMutex); } } #endif /* TCL_THREADS */ | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < > | > > > > > > > > > > > > > > > > > > > > > | 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | notifierThreadRunning = 1; } pthread_mutex_unlock(¬ifierInitMutex); } } #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(¬ifierMutex); tsdPtr->eventReady = 1; # ifdef __CYGWIN__ PostMessageW(tsdPtr->hwnd, 1024, 0, 0); # else pthread_cond_broadcast(&tsdPtr->waitCV); # endif /* __CYGWIN__ */ pthread_mutex_unlock(¬ifierMutex); #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 -- |
︙ | ︙ | |||
561 562 563 564 565 566 567 568 569 570 | 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 | > < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | 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 -- |
︙ | ︙ | |||
805 806 807 808 809 810 811 | filePtr->proc(filePtr->clientData, mask); } break; } return 1; } | < | < < < < < < < < < < < < < < < < < < < < < | < < < < < < < < < < < < < < < | < < < < < < < < < < < < < < < < < < < < < | < < < < | < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | < < < < < < < | < < < < < < | < < < < < < < | < < < < < | < < < | < < < < | < < < < < < < < < < < < < | < < < | < < < < < < < < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | | < < | < < < < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | | | | | | | | | | | | | | | | | | | | | | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 | 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 -- |
︙ | ︙ | |||
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 | 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 */ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 | 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: */ |