* macosx/tkMacOSXInit.c:

	* macosx/tkMacOSXNotify.c: introduction of new tcl notifier based on
	CFRunLoop allows replacement of the custom TkAqua notifier by a
	standard tcl event source. Removes requirement of threaded tcl core
	for TkAqua, allows to stub-link TkAqua against Tcl by removing use of
	the unstubbed TclInitNotifier & TclFinalizeNotifier. [Tcl Patch 1202052]

	* macosx/Wish.xcode/project.pbxproj:
	* macosx/Wish.pbproj/project.pbxproj: stub-link TkAqua: build with
	USE_TCL_STUBS and link against libtclstub instead of Tcl.framework,
	unexport libtclstub symbols from Tk to avoid duplicate symbol warnings
	when linking with both Tcl and Tk, fixes for gcc4.0 warnings.

	* macosx/Wish.xcode/project.pbxproj: sync with Wish.pbproj changes
	since 2004-11-19.
	NOTE: to use this project, need to uncomment the tclConfig.h settings
	at the top of tcl/unix/configure.in, autoconf and rebuild tcl !

	* macosx/tkMacOSXBitmap.c:
	* macosx/tkMacOSXButton.c:
	* macosx/tkMacOSXDialog.c:
	* macosx/tkMacOSXFont.c:
	* macosx/tkMacOSXHLEvents.c:
	* macosx/tkMacOSXInit.c:
	* macosx/tkMacOSXKeyboard.c:
	* macosx/tkMacOSXMenu.c:
	* macosx/tkMacOSXMenubutton.c:
	* macosx/tkMacOSXWm.c:
	* macosx/tkMacOSXXStubs.c: fixed gcc 4.0 warnings.

	* unix/tcl.m4: sync with tcl
	* unix/configure: autoconf-2.59

1 files changed, 78 insertions, 1057 deletions

diff --git a/macosx/tkMacOSXNotify.c b/macosx/tkMacOSXNotify.c
index abf83b4..8c9a4e4 100644
--- a/macosx/tkMacOSXNotify.c
+++ b/macosx/tkMacOSXNotify.c
@@ -1,462 +1,97 @@
 /*
  * tkMacOSXNotify.c --
  *
- *	This file contains the implementation of a merged 
- *	Carbon/select-based notifier, which is the lowest-level part 
- *	of the Tcl event loop.  This file works together with
- *	generic/tclNotify.c.
+ *	This file contains the implementation of a tcl event source 
+ *	for the Carbon event loop.
  *
  * Copyright (c) 1995-1997 Sun Microsystems, Inc.
  * Copyright 2001, Apple Computer, Inc.
+ * Copyright 2005, Tcl Core Team.
  *
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tkMacOSXNotify.c,v 1.10 2005/04/28 08:37:01 dkf Exp $
+ * RCS: @(#) $Id: tkMacOSXNotify.c,v 1.11 2005/05/14 20:48:15 das Exp $
  */
 
 #include "tclInt.h"
 #include "tkInt.h"
 #include "tkMacOSXEvent.h"
-
-#include <signal.h> 
-
-#ifndef TCL_THREADS
-#error Mac OS X notifier requires tcl threads!
-#endif
-
-/*
- * This structure is used to keep track of the notifier info for a 
- * 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;		/* Procedure 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;
+#include <pthread.h>
 
 /*
- * The following structure is what is added to the Tcl event queue when
- * file handlers are ready to fire.
- */
-
-typedef struct FileHandlerEvent {
-    Tcl_Event header;		/* Information that is standard for
-				 * all events. */
-    int fd;			/* File descriptor that is ready.  Used
-				 * to find the FileHandler structure for
-				 * the file (can't point directly to the
-				 * FileHandler structure because it could
-				 * go away while the event is queued). */
-} FileHandlerEvent;
-
-/*
- *
- * The following structure contains a set of select() masks to track
- * readable, writable, and exceptional conditions.
- */
-
-typedef struct SelectMasks {
-    fd_set readable;
-    fd_set writable;
-    fd_set exceptional;
-} SelectMasks;
-
-/*
- * The following static structure contains the state information for the
- * select based implementation of the Tcl notifier.  One of these structures
- * is created for each thread that is using the notifier.  
+ * The following static indicates whether this module has been initialized
+ * in the current thread.
  */
 
 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). */
-    int isMainLoop;		/* Is this the main Carbon Loop (in which case
-				 * we will call RNE in the actual wait... */
-    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. */
-    Tcl_Condition waitCV;	/* Any other thread alerts a notifier
-				 * that an event is ready to be processed
-				 * by signaling this condition variable. */
-    int eventReady;		/* True if an event is ready to be processed.
-				 * Used as condition flag together with
-				 * waitCV above. */
+    int initialized;
 } ThreadSpecificData;
-
 static Tcl_ThreadDataKey dataKey;
 
-/*
- * 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 
- * 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 accessing this list.
- */
-
-static int triggerPipe = -1;
-
-/*
- * The notifierMutex locks access to all of the global notifier state. 
- */
-
-TCL_DECLARE_MUTEX(notifierMutex)
-
-/*
- * The notifier thread signals the notifierCV when it has finished
- * initializing the triggerPipe and right before the notifier
- * thread terminates.
- */
-
-static Tcl_Condition notifierCV;
-
-/*
- * 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;
-
-/*
- * Static routines defined in this file.
- */
+static void TkMacOSXNotifyExitHandler(ClientData clientData);
+static void CarbonEventsSetupProc(ClientData clientData, int flags);
+static void CarbonEventsCheckProc(ClientData clientData, int flags);
 
-static void	NotifierThreadProc(ClientData clientData);
-static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);
-static void	AlertNotifier(ThreadSpecificData *tsdPtr);
-
-/* DKF: Should these be static? */
-void		TkMacOSXSetTimer(Tcl_Time *timePtr);
-void		TkMacOSXCreateFileHandler(int fd, int mask, Tcl_FileProc *proc,
-		    ClientData clientData);
-void		TkMacOSXDeleteFileHandler(int fd);
-int		TkMacOSXWaitForEvent(Tcl_Time *timePtr);
-void		TkMacOSXAlertNotifier(ClientData clientData);
-ClientData	TkMacOSXInitNotifier();
-void		TkMacOSXFinalizeNotifier(ClientData clientData);
-void		TkMacOSXServiceModeHook(int mode);
-EventRef	TkMacOSXCreateFakeEvent();
 /*
  *----------------------------------------------------------------------
  *
  * Tk_MacOSXSetupTkNotifier --
  *
- *	Replaces the Tcl notifier (from tclUnixNotfy.c) with
- *	the Mac notifier that melds the Unix select based notifer
- *	with the Carbon event handling side of the Tk notifier.
+ *	This procedure is called during Tk initialization to create
+ *	the event source for Carbon events.
  *
  * Results:
- *	Replaces the notifier callbacks with MacOS X specific ones.
- *
- * Side effects:
  *	None.
  *
- *----------------------------------------------------------------------
- */
-
-void
-Tk_MacOSXSetupTkNotifier()
-{
-    EventQueueRef mainEventQueue;
-    Tcl_NotifierProcs macNotifierProcs = {
-	TkMacOSXSetTimer,
-	TkMacOSXWaitForEvent,
-	TkMacOSXCreateFileHandler,
-	TkMacOSXDeleteFileHandler,
-	TkMacOSXInitNotifier,
-	TkMacOSXFinalizeNotifier,
-	TkMacOSXAlertNotifier,
-	TkMacOSXServiceModeHook
-    };
-
-    /*
-     * Dispose of existing unix notifier thread
-     */
-
-    TclFinalizeNotifier();
-
-    Tcl_SetNotifier(&macNotifierProcs);
-
-    /* HACK ALERT: There is a bug in Jaguar where when it goes to make
-     * the event queue for the Main Event Loop, it stores the Current
-     * event loop rather than the Main Event Loop in the Queue structure.
-     * So we have to make sure that the Main Event Queue gets set up on
-     * the main thread.  Calling GetMainEventQueue will force this to
-     * happen.
-     */
-
-    mainEventQueue = GetMainEventQueue();
-
-    /* 
-     * Tcl_SetNotifier doesn't call the TclInitNotifier
-     * so we call it now. If we don't do this the
-     * ThreadSpecificData will keep a pointer to the original
-     * InitNotifier. See tclNotify.c:TclInitNotifier().
-     */
-
-    TclInitNotifier(); 
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_InitNotifier --
- *
- *	Initializes the platform specific notifier state.
- *
- * Results:
- *	Returns a handle to the notifier state for this thread..
- *
  * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
- */
-
-ClientData
-TkMacOSXInitNotifier()
-{
-    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
-
-    tsdPtr->eventReady = 0;
-
-    /*
-     * Start the Notifier thread if necessary.
-     */
-
-    Tcl_MutexLock(&notifierMutex);
-    if (notifierCount == 0) {
-	if (Tcl_CreateThread(&notifierThread, NotifierThreadProc, NULL,
-		TCL_THREAD_STACK_DEFAULT, TCL_THREAD_NOFLAGS) != TCL_OK) {
-	    Tcl_Panic("Tcl_InitNotifier: unable to start notifier thread");
-	}
-    }
-    notifierCount++;
-
-    if (GetCurrentEventLoop() == GetMainEventLoop()) {
-	tsdPtr->isMainLoop = 1;
-    } else {
-	tsdPtr->isMainLoop = 0;
-    }
-
-    /*
-     * Wait for the notifier pipe to be created.
-     */
-
-    while (triggerPipe < 0) {
-	Tcl_ConditionWait(&notifierCV, &notifierMutex, NULL);
-    }
-
-    Tcl_MutexUnlock(&notifierMutex);
-    return (ClientData) 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.
+ *	A new event source is created.
  *
  *----------------------------------------------------------------------
  */
 
 void
-TkMacOSXFinalizeNotifier(clientData)
-    ClientData clientData;		/* Not used. */
+Tk_MacOSXSetupTkNotifier()
 {
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
-
-    Tcl_MutexLock(&notifierMutex);
-    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 < 0) {
-	    Tcl_Panic("Tcl_FinalizeNotifier: notifier pipe not initialized");
+    
+    if (!tsdPtr->initialized) {
+        /* HACK ALERT: There is a bug in Jaguar where when it goes to make
+         * the event queue for the Main Event Loop, it stores the Current
+         * event loop rather than the Main Event Loop in the Queue structure.
+         * So we have to make sure that the Main Event Queue gets set up on
+         * the main thread.  Calling GetMainEventQueue will force this to
+         * happen.
+         */
+        EventQueueRef mainEventQueue = GetMainEventQueue();
+
+        tsdPtr->initialized = 1;
+        /* Install Carbon events event source in main event loop thread. */
+        if (GetCurrentEventLoop() == GetMainEventLoop()) {
+            if (!pthread_main_np()) {
+                /* 
+                 * Panic if the Carbon main event loop thread (i.e. the 
+                 * thread  where HIToolbox was first loaded) is not the
+                 * main application thread, as Carbon does not support
+                 * this properly.
+                 */
+                Tcl_Panic("Tk_MacOSXSetupTkNotifier: %s",
+                    "first [load] of TkAqua has to occur in the main thread!");
+            }
+            Tcl_CreateEventSource(CarbonEventsSetupProc, 
+                    CarbonEventsCheckProc, GetMainEventQueue());
+            TkCreateExitHandler(TkMacOSXNotifyExitHandler, NULL);
 	}
-
-	/*
-	 * Send "q" message to the notifier thread so that it will
-	 * terminate.  The notifier will return from its call to select()
-	 * and notice that a "q" message has arrived, it will then close
-	 * its side of the pipe and terminate its thread.  Note the we can
-	 * not just close the pipe and check for EOF in the notifier
-	 * thread because if a background child process was created with
-	 * exec, select() would not register the EOF on the pipe until the
-	 * child processes had terminated. [Bug: 4139]
-	 */
-	write(triggerPipe, "q", 1);
-	close(triggerPipe);
-
-	Tcl_ConditionWait(&notifierCV, &notifierMutex, NULL);
     }
-
-    /*
-     * Clean up any synchronization objects in the thread local storage.
-     */
-
-    Tcl_ConditionFinalize(&(tsdPtr->waitCV));
-
-    Tcl_MutexUnlock(&notifierMutex);
 }
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_AlertNotifier --
- *
- *	Wake up the specified notifier from any thread. This routine
- *	is called by the platform independent notifier code whenever
- *	the Tcl_ThreadAlert routine is called.  This routine is
- *	guaranteed not to be called on a given notifier after
- *	Tcl_FinalizeNotifier is called for that notifier.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Signals the notifier condition variable for the specified
- *	notifier.
- *
- *----------------------------------------------------------------------
- */
 
-void
-TkMacOSXAlertNotifier(clientData)
-    ClientData clientData;
-{
-    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData;
-    Tcl_MutexLock(&notifierMutex);
-    tsdPtr->eventReady = 1;
-    AlertNotifier(tsdPtr);
-    Tcl_MutexUnlock(&notifierMutex);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * AlertNotifier --
- *
- *	The core of the notifier alerting scheme. Either we wake up
- *	the main event loop and stuff the event to it, or we signal
- *	the thread's condition variable. Note that callers are
- *	responsible for locking the right mutexes, managing the rest
- *	of the notifier state, etc. The thread to alert is determined
- *	by whose tsdPtr we actually have as our argument. The only
- *	expected callers are TkMacOSXAlertNotifier() and
- *	NotifierThreadProc(), both of which take appropriate
- *	precautions.
- *
- * Results:
- *	none
- *
- * Side effects:
- *	A notifier is alerted.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-AlertNotifier(tsdPtr)
-    ThreadSpecificData *tsdPtr;
-{
-    if (tsdPtr->isMainLoop) {
-	/* We need to wake up the main loop, and let it have the event. */
-	EventRef fakeEvent = TkMacOSXCreateFakeEvent();
-	EventQueueRef mainEventQueue = GetMainEventQueue();
-	OSErr err;
-
-	err = PostEventToQueue(mainEventQueue, fakeEvent, kEventPriorityHigh);
-	ReleaseEvent(fakeEvent);
-    } else {
-	Tcl_ConditionNotify(&tsdPtr->waitCV);
-    }
-}
-
 /*
  *----------------------------------------------------------------------
  *
- * Tcl_SetTimer --
+ * TkMacOSXNotifyExitHandler --
  *
- *	This procedure sets the current notifier timer value.  This
- *	interface is not implemented in this notifier because we are
- *	always running inside of Tcl_DoOneEvent.
+ *	This function is called during finalization to clean up the
+ *	TkMacOSXNotify module.
  *
  * Results:
  *	None.
@@ -467,693 +102,79 @@ AlertNotifier(tsdPtr)
  *----------------------------------------------------------------------
  */
 
-void
-TkMacOSXSetTimer(timePtr)
-    Tcl_Time *timePtr;		/* Timeout value, may be NULL. */
-{
-    /*
-     * The interval timer doesn't do anything in this implementation,
-     * because the only event loop is via Tcl_DoOneEvent, which passes
-     * timeout values to Tcl_WaitForEvent.
-     */
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_ServiceModeHook --
- *
- *	This function is invoked whenever the service mode changes.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
- */
-
-void
-TkMacOSXServiceModeHook(mode)
-    int mode;			/* Either TCL_SERVICE_ALL, or
-				 * TCL_SERVICE_NONE. */
-{
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_CreateFileHandler --
- *
- *	This procedure registers a file handler with the select notifier.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Creates a new file handler structure.
- *
- *----------------------------------------------------------------------
- */
-
-void
-TkMacOSXCreateFileHandler(fd, mask, proc, clientData)
-    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;		/* Procedure to call for each
-				 * selected event. */
-    ClientData clientData;	/* Arbitrary data to pass to proc. */
+static void
+TkMacOSXNotifyExitHandler(clientData)
+    ClientData clientData;	/* Not used. */
 {
     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 = (FileHandler*) 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.exceptional));
-    } else {
-	FD_CLR(fd, &(tsdPtr->checkMasks.exceptional));
-    }
-    if (tsdPtr->numFdBits <= fd) {
-	tsdPtr->numFdBits = fd+1;
-    }
+    Tcl_DeleteEventSource(CarbonEventsSetupProc, 
+            CarbonEventsCheckProc, GetMainEventQueue());
+    tsdPtr->initialized = 0;
 }
 
 /*
  *----------------------------------------------------------------------
  *
- * Tcl_DeleteFileHandler --
+ * CarbonEventsSetupProc --
  *
- *	Cancel a previously-arranged callback arrangement for
- *	a file.
+ *	This procedure implements the setup part of the Carbon Events
+ *	event source.  It is invoked by Tcl_DoOneEvent before entering
+ *	the notifier to check for events.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	If a callback was previously registered on file, remove it.
+ *	If Carbon events are queued, then the maximum block time will be
+ *	set to 0 to ensure that the notifier returns control to Tcl.
  *
  *----------------------------------------------------------------------
  */
 
-void
-TkMacOSXDeleteFileHandler(fd)
-    int fd;		/* Stream id for which to remove callback procedure. */
+static void
+CarbonEventsSetupProc(clientData, flags)
+    ClientData clientData;
+    int flags;
 {
-    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.exceptional));
-    }
-
-    /*
-     * Find current max fd.
-     */
+    static Tcl_Time blockTime = { 0, 0 };
 
-    if (fd+1 == tsdPtr->numFdBits) {
-	tsdPtr->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.exceptional))) {
-		tsdPtr->numFdBits = i+1;
-		break;
-	    }
-	}
+    if (!(flags & TCL_WINDOW_EVENTS)) {
+	return;
     }
 
-    /*
-     * Clean up information in the callback record.
-     */
-
-    if (prevPtr == NULL) {
-	tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
-    } else {
-	prevPtr->nextPtr = filePtr->nextPtr;
+    if (GetNumEventsInQueue((EventQueueRef)clientData)) {
+        Tcl_SetMaxBlockTime(&blockTime);
     }
-    ckfree((char *) filePtr);
 }
-
-/*
- *----------------------------------------------------------------------
- *
- * FileHandlerEventProc --
- *
- *	This procedure is called by Tcl_ServiceEvent when a file event
- *	reaches the front of the event queue.  This procedure is
- *	responsible for actually handling the event by invoking the
- *	callback for the file handler.
- *
- * Results:
- *	Returns 1 if the event was handled, meaning it should be removed
- *	from the queue.  Returns 0 if the event was not handled, meaning
- *	it should stay on the queue.  The only time the event isn't
- *	handled is if the TCL_FILE_EVENTS flag bit isn't set.
- *
- * Side effects:
- *	Whatever the file handler's callback procedure does.
- *
- *----------------------------------------------------------------------
- */
-
-static int
-FileHandlerEventProc(evPtr, flags)
-    Tcl_Event *evPtr;		/* Event to service. */
-    int flags;			/* Flags that indicate what events to
-				 * handle, such as TCL_FILE_EVENTS. */
-{
-    int mask;
-    FileHandler *filePtr;
-    FileHandlerEvent *fileEvPtr = (FileHandlerEvent *) evPtr;
-    ThreadSpecificData *tsdPtr;
-
-    if (!(flags & TCL_FILE_EVENTS)) {
-	return 0;
-    }
-
-    /*
-     * Search through the file handlers to find the one whose handle matches
-     * the event.  We do this rather than keeping a pointer to the file
-     * handler directly in the event, so that the handler can be deleted
-     * while the event is queued without leaving a dangling pointer.
-     */
-
-    tsdPtr = TCL_TSD_INIT(&dataKey);
-    for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
-	    filePtr = filePtr->nextPtr) {
-	if (filePtr->fd != fileEvPtr->fd) {
-	    continue;
-	}
 
-	/*
-	 * The code is tricky for two reasons:
-	 * 1. The file handler's desired events could have changed
-	 *    since the time when the event was queued, so AND the
-	 *    ready mask with the desired mask.
-	 * 2. The file could have been closed and re-opened since
-	 *    the time when the event was queued.  This is why the
-	 *    ready mask is stored in the file handler rather than
-	 *    the queued event:  it will be zeroed when a new
-	 *    file handler is created for the newly opened file.
-	 */
-
-	mask = filePtr->readyMask & filePtr->mask;
-	filePtr->readyMask = 0;
-	if (mask != 0) {
-	    (*filePtr->proc)(filePtr->clientData, mask);
-	}
-	break;
-    }
-    return 1;
-}
-
 /*
  *----------------------------------------------------------------------
  *
- * Tcl_WaitForEvent --
+ * CarbonEventsCheckProc --
  *
- *	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.
+ *	This procedure processes events sitting in the Carbon event
+ *	queue.
  *
  * Results:
- *	Returns -1 if the select would block forever, otherwise
- *	returns 0.
- *
- * Side effects:
- *	Queues file events that are detected by the select.
- *
- *----------------------------------------------------------------------
- */
-
-int
-TkMacOSXWaitForEvent(timePtr)
-    Tcl_Time *timePtr;		/* Maximum block time, or NULL. */
-{
-    FileHandler *filePtr;
-    FileHandlerEvent *fileEvPtr;
-    int mask;
-    Tcl_Time myTime;
-    int waitForFiles;
-    Tcl_Time *myTimePtr;
-    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 */
-
-	myTime.sec  = timePtr->sec;
-	myTime.usec = timePtr->usec;
-
-	if (myTime.sec != 0 || myTime.usec != 0) {
-	    Tcl_ScaleTimeProc* tclScaleTimeProcPtr;
-	    ClientData tclTimeClientData;
-
-	    Tcl_QueryTimeProc(NULL, &tclScaleTimeProcPtr, &tclTimeClientData);
-	    (*tclScaleTimeProcPtr) (&myTime, tclTimeClientData);
-	}
-	myTimePtr = &myTime;
-    } else {
-	myTimePtr = NULL;
-    }
-
-    /*
-     * Place this thread on the list of interested threads, signal the
-     * notifier thread, and wait for a response or a timeout.
-     */
-
-    Tcl_MutexLock(&notifierMutex);
-
-    waitForFiles = (tsdPtr->numFdBits > 0);
-    if (myTimePtr != NULL && myTimePtr->sec == 0 && myTimePtr->usec == 0) {
-	/*
-	 * 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;
-	myTimePtr = NULL;
-    } else {
-	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;
-
-	write(triggerPipe, "", 1);
-    }
-
-    FD_ZERO(&(tsdPtr->readyMasks.readable));
-    FD_ZERO(&(tsdPtr->readyMasks.writable));
-    FD_ZERO(&(tsdPtr->readyMasks.exceptional));
-
-    if (!tsdPtr->eventReady) {
-	if (!tsdPtr->isMainLoop) {
-	    Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, myTimePtr);
-	} else {
-	    OSErr err;
-	    EventRef eventRef;
-	    EventTime waitTime;
-
-	    if (myTimePtr == NULL) {
-		waitTime = kEventDurationForever;
-	    } else {
-		waitTime = myTimePtr->sec  * kEventDurationSecond 
-			+ myTimePtr->usec * kEventDurationMicrosecond;
-	    }
-	    Tcl_MutexUnlock(&notifierMutex);
-	    err = ReceiveNextEvent(0, NULL, waitTime, false, &eventRef);
-	    Tcl_MutexLock(&notifierMutex);
-	}
-    }
-    tsdPtr->eventReady = 0;
-
-    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;
-	write(triggerPipe, "", 1);
-    }
-
-    /*
-     * 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.exceptional))) {
-	    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) {
-	    fileEvPtr = (FileHandlerEvent *) ckalloc(sizeof(FileHandlerEvent));
-	    fileEvPtr->header.proc = FileHandlerEventProc;
-	    fileEvPtr->fd = filePtr->fd;
-	    Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
-	}
-	filePtr->readyMask = mask;
-    }
-    Tcl_MutexUnlock(&notifierMutex);
-
-    /* 
-     * Also queue the Mac Events found...
-     */
-    if (tsdPtr->isMainLoop) {
-	TkMacOSXCountAndProcessMacEvents();
-    }
-
-    return 0;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * 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.
+ *	None.
  *
  * Side effects:
- *	The trigger pipe used to signal the notifier thread is created
- *	when the notifier thread first starts.
+ *	Moves applicable queued Carbon events onto the Tcl event queue.
  *
  *----------------------------------------------------------------------
  */
 
 static void
-NotifierThreadProc(clientData)
-    ClientData clientData;	/* Not used. */
+CarbonEventsCheckProc(clientData, flags)
+    ClientData clientData;
+    int flags;
 {
-    ThreadSpecificData *tsdPtr;
-    fd_set readableMask;
-    fd_set writableMask;
-    fd_set exceptionalMask;
-    int fds[2];
-    int i, status, numFdBits = 0, receivePipe;
-    long found;
-    struct timeval poll = {0., 0.}, *timePtr;
-    char buf[2];
-
-    if (pipe(fds) != 0) {
-	Tcl_Panic("NotifierThreadProc: could not create trigger pipe.");
-    }
-
-    receivePipe = fds[0];
-
-    status = fcntl(receivePipe, F_GETFL);
-    status |= O_NONBLOCK;
-    if (fcntl(receivePipe, F_SETFL, status) < 0) {
-	Tcl_Panic("NotifierThreadProc: could not make receive pipe non blocking.");
+    if (!(flags & TCL_WINDOW_EVENTS)) {
+	return;
     }
-    status = fcntl(fds[1], F_GETFL);
-    status |= O_NONBLOCK;
-    if (fcntl(fds[1], F_SETFL, status) < 0) {
-	Tcl_Panic("NotifierThreadProc: could not make trigger pipe non blocking.");
-    }
-
-    /*
-     * Install the write end of the pipe into the global variable.
-     */
-
-    Tcl_MutexLock(&notifierMutex);
-    triggerPipe = fds[1];
-
-    /*
-     * Signal any threads that are waiting.
-     */
-
-    Tcl_ConditionNotify(&notifierCV);
-    Tcl_MutexUnlock(&notifierMutex);
-
-    /*
-     * Look for file events and report them to interested threads.
-     */
-
-    while (1) {
-	FD_ZERO(&readableMask);
-	FD_ZERO(&writableMask);
-	FD_ZERO(&exceptionalMask);
-
-	/*
-	 * Compute the logical OR of the select masks from all the
-	 * waiting notifiers.
-	 */
-
-	Tcl_MutexLock(&notifierMutex);
-	timePtr = NULL;
-	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
-	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.readable))) {
-		    FD_SET(i, &readableMask);
-		}
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.writable))) {
-		    FD_SET(i, &writableMask);
-		}
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.exceptional))) {
-		    FD_SET(i, &exceptionalMask);
-		}
-	    }
-	    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;
-	    }
-	}
-	Tcl_MutexUnlock(&notifierMutex);
-
-	/*
-	 * Set up the select mask to include the receive pipe.
-	 */
-
-	if (receivePipe >= numFdBits) {
-	    numFdBits = receivePipe + 1;
-	}
-	FD_SET(receivePipe, &readableMask);
-
-	if (select(numFdBits, &readableMask, &writableMask, &exceptionalMask,
-		timePtr) == -1) {
-	    /*
-	     * Try again immediately on an error.
-	     */
-
-	    continue;
-	}
-
-	/*
-	 * Alert any threads that are waiting on a ready file descriptor.
-	 */
-
-	Tcl_MutexLock(&notifierMutex);
-	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
-	    found = 0;
-
-	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.readable))
-			&& FD_ISSET(i, &readableMask)) {
-		    FD_SET(i, &(tsdPtr->readyMasks.readable));
-		    found = 1;
-		}
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.writable))
-			&& FD_ISSET(i, &writableMask)) {
-		    FD_SET(i, &(tsdPtr->readyMasks.writable));
-		    found = 1;
-		}
-		if (FD_ISSET(i, &(tsdPtr->checkMasks.exceptional))
-			&& FD_ISSET(i, &exceptionalMask)) {
-		    FD_SET(i, &(tsdPtr->readyMasks.exceptional));
-		    found = 1;
-		}
-	    }
-
-	    if (found || (tsdPtr->pollState & POLL_DONE)) {
-		tsdPtr->eventReady = 1;
-		if (tsdPtr->onList) {
-		    /*
-		     * Remove the ThreadSpecificData structure of this
-		     * thread from the waiting list. This prevents us from
-		     * continuously spining on select until the other
-		     * threads runs and services the file event.
-		     */
-
-		    if (tsdPtr->prevPtr) {
-			tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
-		    } else {
-			waitingListPtr = tsdPtr->nextPtr;
-		    }
-		    if (tsdPtr->nextPtr) {
-			tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
-		    }
-		    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
-		    tsdPtr->onList = 0;
-		    tsdPtr->pollState = 0;
-		}
-		AlertNotifier(tsdPtr);
-	    }
-	}
-	Tcl_MutexUnlock(&notifierMutex);
-
-	/*
-	 * Consume the next byte from the notifier pipe if the pipe was
-	 * readable.  Note that there may be multiple bytes pending, but
-	 * to avoid a race condition we only read one at a time.
-	 */
-
-	if (FD_ISSET(receivePipe, &readableMask)) {
-	    i = read(receivePipe, buf, 1);
-
-	    if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) {
-		/*
-		 * Someone closed the write end of the pipe or sent us a
-		 * Quit message [Bug: 4139] and then closed the write end
-		 * of the pipe so we need to shut down the notifier thread.
-		 */
-
-		break;
-	    }
-	}
-    }
-
-    /*
-     * Clean up the read end of the pipe and signal any threads waiting on
-     * termination of the notifier thread.
-     */
-
-    close(receivePipe);
-    Tcl_MutexLock(&notifierMutex);
-    triggerPipe = -1;
-    Tcl_ConditionNotify(&notifierCV);
-    Tcl_MutexUnlock(&notifierMutex);
-
-    Tcl_ExitThread(0);
-}
-
-EventRef 
-TkMacOSXCreateFakeEvent()
-{
-    EventKind	    eKind;
-    EventClass	    eClass;
-    EventTime	    eTime;
-    EventRef	    eventRef;
-    EventAttributes flags;
 
-    eClass = kEventClassWish;
-    eKind = 0xffff;
-    eTime = GetLastUserEventTime() + 0.001;
-    flags = kEventAttributeUserEvent;
-    if (CreateEvent(NULL,eClass,eKind,eTime,flags,&eventRef) != noErr) {
-	/* DKF: Printing to stderr? Leaked debug code here? */
-        fprintf(stderr, "CreateEvent failed\n");
-        return NULL;
+    if (GetNumEventsInQueue((EventQueueRef)clientData)) {
+        TkMacOSXCountAndProcessMacEvents();
     }
-    return eventRef;
 }