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-rw-r--r--generic/tkEvent.c148
1 files changed, 147 insertions, 1 deletions
diff --git a/generic/tkEvent.c b/generic/tkEvent.c
index f95bf9e..f6bf9d4 100644
--- a/generic/tkEvent.c
+++ b/generic/tkEvent.c
@@ -11,7 +11,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkEvent.c,v 1.18 2003/07/19 01:01:36 hobbs Exp $
+ * RCS: @(#) $Id: tkEvent.c,v 1.19 2003/12/21 23:50:13 davygrvy Exp $
*/
#include "tkPort.h"
@@ -154,6 +154,29 @@ typedef struct ThreadSpecificData {
static Tcl_ThreadDataKey dataKey;
/*
+ * For each exit handler created with a call to TkCreateExitHandler
+ * there is a structure of the following type:
+ */
+
+typedef struct ExitHandler {
+ Tcl_ExitProc *proc; /* Procedure to call when process exits. */
+ ClientData clientData; /* One word of information to pass to proc. */
+ struct ExitHandler *nextPtr;/* Next in list of all exit handlers for
+ * this application, or NULL for end of list. */
+} ExitHandler;
+
+/*
+ * There is both per-process and per-thread exit handlers.
+ * The first list is controlled by a mutex. The other is in
+ * thread local storage.
+ */
+
+static ExitHandler *firstExitPtr = NULL;
+ /* First in list of all exit handlers for
+ * application. */
+TCL_DECLARE_MUTEX(exitMutex)
+
+/*
* Prototypes for procedures that are only referenced locally within
* this file.
*/
@@ -1458,6 +1481,129 @@ DelayedMotionProc(clientData)
}
/*
+ *---------------------------------------------------------------------------
+ *
+ * TkCreateExitHandler --
+ *
+ * Same as Tcl_CreateExitHandler, but private to Tk.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects.
+ * Sets a handler with Tcl_CreateExitHandler if this is the first call.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+void
+TkCreateExitHandler (proc, clientData)
+ Tcl_ExitProc *proc; /* Procedure to invoke. */
+ ClientData clientData; /* Arbitrary value to pass to proc. */
+{
+ ExitHandler *exitPtr;
+
+ exitPtr = (ExitHandler *) ckalloc(sizeof(ExitHandler));
+ exitPtr->proc = proc;
+ exitPtr->clientData = clientData;
+ Tcl_MutexLock(&exitMutex);
+ if (firstExitPtr == NULL) {
+ Tcl_CreateExitHandler(TkFinalize, NULL);
+ }
+ exitPtr->nextPtr = firstExitPtr;
+ firstExitPtr = exitPtr;
+ Tcl_MutexUnlock(&exitMutex);
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * TkDeleteExitHandler --
+ *
+ * Same as Tcl_DeleteExitHandler, but private to Tk.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects.
+ * None.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+void
+TkDeleteExitHandler (proc, clientData)
+ Tcl_ExitProc *proc; /* Procedure that was previously registered. */
+ ClientData clientData; /* Arbitrary value to pass to proc. */
+{
+ ExitHandler *exitPtr, *prevPtr;
+
+ Tcl_MutexLock(&exitMutex);
+ for (prevPtr = NULL, exitPtr = firstExitPtr; exitPtr != NULL;
+ prevPtr = exitPtr, exitPtr = exitPtr->nextPtr) {
+ if ((exitPtr->proc == proc)
+ && (exitPtr->clientData == clientData)) {
+ if (prevPtr == NULL) {
+ firstExitPtr = exitPtr->nextPtr;
+ } else {
+ prevPtr->nextPtr = exitPtr->nextPtr;
+ }
+ ckfree((char *) exitPtr);
+ break;
+ }
+ }
+ Tcl_MutexUnlock(&exitMutex);
+ return;
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * TkFinalize --
+ *
+ * Runs our private exit handlers and removes itself from Tcl. This is
+ * benificial should we want to protect from dangling pointers should
+ * the Tk shared library be unloaded prior to Tcl which can happen on
+ * windows should the process be forcefully exiting from an exception
+ * handler.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects.
+ * None.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+void
+TkFinalize (clientData)
+ ClientData clientData; /* Arbitrary value to pass to proc. */
+{
+ ExitHandler *exitPtr;
+
+ Tcl_DeleteExitHandler(TkFinalize, NULL);
+
+ Tcl_MutexLock(&exitMutex);
+ for (exitPtr = firstExitPtr; exitPtr != NULL; exitPtr = firstExitPtr) {
+ /*
+ * Be careful to remove the handler from the list before
+ * invoking its callback. This protects us against
+ * double-freeing if the callback should call
+ * TkDeleteExitHandler on itself.
+ */
+
+ firstExitPtr = exitPtr->nextPtr;
+ Tcl_MutexUnlock(&exitMutex);
+ (*exitPtr->proc)(exitPtr->clientData);
+ ckfree((char *) exitPtr);
+ Tcl_MutexLock(&exitMutex);
+ }
+ firstExitPtr = NULL;
+ Tcl_MutexUnlock(&exitMutex);
+}
+
+/*
*--------------------------------------------------------------
*
* Tk_MainLoop --