Attachment "autoclean.patch" to
ticket [940207ffff]
added by
msofer
2004-04-23 01:47:25.
? generic/tclObj.c.ORIG
? unix/ERR
? unix/dltest.marker
? unix/tclsh-head
? unix/tclsh-noAsync
? unix/tclsh-noStart
Index: generic/tclBasic.c
===================================================================
RCS file: /cvsroot/tcl/tcl/generic/tclBasic.c,v
retrieving revision 1.99
diff -u -r1.99 tclBasic.c
--- generic/tclBasic.c 6 Apr 2004 22:25:48 -0000 1.99
+++ generic/tclBasic.c 22 Apr 2004 18:40:07 -0000
@@ -50,6 +50,10 @@
* The built-in commands, and the procedures that implement them:
*/
+int SetAutoCleaningCmdObjCmd _ANSI_ARGS_((ClientData clientData,
+ Tcl_Interp * interp, int objc, Tcl_Obj *CONST objv[]));
+
+
static CmdInfo builtInCmds[] = {
/*
* Commands in the generic core. Note that at least one of the proc or
@@ -489,6 +493,14 @@
iPtr->flags |= EXPR_INITIALIZED;
/*
+ * Create the SetAutoCleaningCmd command.
+ */
+
+ Tcl_CreateObjCommand(interp, "::tcl::unsupported::SetAutoCleaningCmd",
+ SetAutoCleaningCmdObjCmd, NULL,NULL);
+
+
+ /*
* Do Multiple/Safe Interps Tcl init stuff
*/
@@ -2711,6 +2723,11 @@
cmdPtr->refCount--;
if (cmdPtr->refCount <= 0) {
ckfree((char *) cmdPtr);
+ } else if ((cmdPtr->flags & CMD_AUTOCLEAN)
+ && !(cmdPtr->flags & CMD_IS_DELETED)
+ && (cmdPtr->refCount == 1)) {
+ Tcl_DeleteCommandFromToken(cmdPtr->nsPtr->interp,
+ (Tcl_Command)cmdPtr);
}
}
@@ -4996,3 +5013,72 @@
}
}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclSetAutoCleaningCmdObjCmd
+ *
+ * This object-based procedure is invoked to process the
+ * ::tcl::unsupported::SetAutoCleaningCmd command.
+ *
+ * When the CMD_AUTOCLEAN flag is set, the command will be
+ * deleted when its reference count reaches 1 - ie, when
+ * its only reference is in its namespace's hash table.
+ *
+ * Arguments:
+ * objv[1] is the name of the command whose autocleaning
+ * flag will be set
+ * objv[2] (if present) is a boolean indicating if the flag
+ * is to be set or unset. Defaults to 1.
+ *
+ * Results:
+ * A standard Tcl result; only returns an error if objc
+ * is neither 2 or 3.
+ *
+ * Side effects:
+ * The CMD_AUTOCLEAN flag of the command named objv[1] is set to
+ * the requested value; objv[1] is converted to cmdNameType.
+ *
+ * **********
+ * WARNING
+ * **********
+ *
+ * Autocleaning commands can break the Tcl semantics. Care has to be
+ * taken to insure that the command can be recreated from its name's
+ * string rep.
+ *
+ * This command is used in [lambda] implementations (TIP 187); they
+ * rely on [unknown] to restore the Tcl semantics.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+SetAutoCleaningCmdObjCmd(dummy, interp, objc, objv)
+ ClientData dummy; /* Not used. */
+ Tcl_Interp *interp; /* Current interpreter. */
+ int objc; /* Number of arguments. */
+ Tcl_Obj *CONST objv[]; /* Argument objects. */
+{
+ Command *cmdPtr;
+ int bool = 1;
+
+ if (objc == 3) {
+ Tcl_GetBooleanFromObj(interp, objv[2], &bool);
+ } else if (objc != 2) {
+ Tcl_WrongNumArgs(interp, 1, objv, "cmdName ?boolVal?");
+ return TCL_ERROR;
+ }
+
+ cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, objv[1]);
+ if (cmdPtr != NULL) {
+ if (bool) {
+ cmdPtr->flags |= CMD_AUTOCLEAN;
+ } else {
+ cmdPtr->flags &= ~CMD_AUTOCLEAN;
+ }
+ }
+
+ return TCL_OK;
+}
Index: generic/tclInt.h
===================================================================
RCS file: /cvsroot/tcl/tcl/generic/tclInt.h,v
retrieving revision 1.152
diff -u -r1.152 tclInt.h
--- generic/tclInt.h 7 Apr 2004 22:04:29 -0000 1.152
+++ generic/tclInt.h 22 Apr 2004 18:40:08 -0000
@@ -1080,6 +1080,10 @@
* underway for a rename/delete change.
* See the two flags below for which is
* currently being processed.
+ * CMD_AUTOCLEAN 1 means this command should delete itself
+ * when its reference count reaches 1 - ie,
+ * when the only reference is in its namespace's
+ * hash table.
* CMD_HAS_EXEC_TRACES - 1 means that this command has at least
* one execution trace (as opposed to simple
* delete/rename traces) in its tracePtr list.
@@ -1092,6 +1096,7 @@
#define CMD_IS_DELETED 0x1
#define CMD_TRACE_ACTIVE 0x2
#define CMD_HAS_EXEC_TRACES 0x4
+#define CMD_AUTOCLEAN 0x8
/*
*----------------------------------------------------------------
