*** macosx-8-4-branch merged into the mainline [tcl patch #602770] ***macosx_8_4_merge_2002_08_31_trunk

	* generic/tk.decls:
	* generic/tkInt.decls: added new "aqua" specific entries to the
	stubs tables. Changed all "unix" entries to "x11" to allow us to
	distinguish and build both "aqua" on MacOSX and "x11" on MacOSX.

	* generic/tk.h: added a #ifnded RESOURCE_INCLUDED so that tk.h can
	be passed to the resource compiler.

	* generic/tkCmds.c (Tk_TkObjCmd): added [tk windowingsystem]
	subcommand: returns "x11" when running on X11, "win32" on Windows,
	"classic" on MacOS9 and "aqua" on MacOSX Aqua (i.e. Carbon)

	* generic/tkFont.c (TkFontGetFirstTextLayout): new private function
	returning the first chunk of a Tk_TextLayout, i.e. until the first
	font change on the first line (or the whole first line if there is
	no such font change).

	* generic/tkMain.c: made Tcl_ThreadDataKey static

	* library/demos/puzzle.tcl: fixed button metrics for aqua

	* tests/cursor.test: check for presence of arrow cursor instead of
	heart cursor

	* xlib/xcolors.c: changed xColors static initialization to more
	standard C

	* macosx/Wish.pbproj/jingham.pbxuser (new):
	* macosx/Wish.pbproj/project.pbxproj (new): project for Apple's
	ProjectBuilder IDE.

	* macosx/Makefile (new): simple makefile for building the project
	from the command line via the ProjectBuilder tool 'pbxbuild'.

	* macosx/tkMacOSXAppInit.c (new): macosx specific AppInit looking
	for a AppMain.tcl file in its bundled Resources/Scripts folder. If
	present, argv[1] is set to that file and the Scripts folder is
	added to the auto_path. This allows tk apps to embed scripts within
	their bundle directory structure.

	* macosx/tkMacOSXInit.c (new): macosx adapted version of
	tkUnixInit.c: we initialize & cache the Carbon native encoding
	(e.g. 'macRoman') and try to find the tk script library files
	inside Tk packaged as a framework.

	* macosx/tkMacOSXNotify.c (new): new macosx specific merged
	Carbon/select-based notifier.

	* macosx/tkMacOSXEvent.c (new):
	* macosx/tkMacOSXEvent.h (new):
	* macosx/tkMacOSXKeyEvent.c (new):
	* macosx/tkMacOSXMouseEvent.c (new):
	* macosx/tkMacOSXWindowEvent.c (new): new macosx specific event
	handling functionality.

	* macosx/tkMacOSX.h (new):
	* macosx/tkMacOSXBitmap.c (new):
	* macosx/tkMacOSXButton.c (new):
	* macosx/tkMacOSXClipboard.c (new):
	* macosx/tkMacOSXColor.c (new):
	* macosx/tkMacOSXConfig.c (new):
	* macosx/tkMacOSXCursor.c (new):
	* macosx/tkMacOSXDefault.h (new):
	* macosx/tkMacOSXDialog.c (new):
	* macosx/tkMacOSXDraw.c (new):
	* macosx/tkMacOSXEmbed.c (new):
	* macosx/tkMacOSXFont.c (new):
	* macosx/tkMacOSXHLEvents.c (new):
	* macosx/tkMacOSXInt.h (new):
	* macosx/tkMacOSXKeyboard.c (new):
	* macosx/tkMacOSXMenu.c (new):
	* macosx/tkMacOSXMenubutton.c (new):
	* macosx/tkMacOSXMenus.c (new):
	* macosx/tkMacOSXPort.h (new):
	* macosx/tkMacOSXRegion.c (new):
	* macosx/tkMacOSXScale.c (new):
	* macosx/tkMacOSXScrlbr.c (new):
	* macosx/tkMacOSXSubwindows.c (new):
	* macosx/tkMacOSXTest.c (new):
	* macosx/tkMacOSXUtil.c (new):
	* macosx/tkMacOSXUtil.h (new):
	* macosx/tkMacOSXWm.c (new):
	* macosx/tkMacOSXWm.h (new):
	* macosx/tkMacOSXXStubs.c (new): macosx ports of classic mac Tk
	implementation in tk/mac.

	* macosx/tkMacOSXSend.c (new): only send to local interp
	implemented currently.

	* macosx/tkMacOSXDebug.h (new):
	* macosx/tkMacOSXDebug.c (new): new macosx specific functions for
	debugging MacOS events, regions, etc.

	* macosx/tkAboutDlg.r (new):
	* macosx/tkMacOSXApplication.r (new):
	* macosx/tkMacOSXCursors.r (new):
	* macosx/tkMacOSXLibrary.r (new):
	* macosx/tkMacOSXMenu.r (new):
	* macosx/tkMacOSXResource.r (new):
	* macosx/tkMacOSXXCursors.r (new):
	* macosx/tclets.r (new): sources for Rez resource compiler.

	* macosx/Wish.icns (new): Wish application icon.

	* generic/tk.h:
	* generic/default.h:
	* generic/tkBind.c:
	* generic/tkCmds.c:
	* generic/tkGrab.c:
	* generic/tkPointer.c:
	* generic/tkPort.h:
	* generic/tkSelect.c:
	* generic/tkStubLib.c:
	* generic/tkTest.c:
	* generic/tkText.c:
	* generic/tkWindow.c:
	* unix/tkUnix3d.c:
	* xlib/xgc.c:
	* xlib/X11/X.h:
	* xlib/X11/Xlib.h:
	* xlib/X11/Xutil.h: added #includes and #ifdefs for macosx

	* library/bgerror.tcl:
	* library/button.tcl:
	* library/console.tcl:
	* library/dialog.tcl:
	* library/entry.tcl:
	* library/listbox.tcl:
	* library/menu.tcl:
	* library/msgbox.tcl:
	* library/scrlbar.tcl:
	* library/spinbox.tcl:
	* library/text.tcl:
	* library/tk.tcl:
	* library/demos/menu.tcl:
	* library/demos/menubu.tcl:
	* library/demos/widget: check [tk windowingsystem] instead of
	and/or in addition to $tcl_platform(platform).

	* generic/tkInt.h:
	* mac/tkMacBitmap.c:
	* mac/tkMacWm.c: added missing CONSTification

	* generic/tkIntDecls.h:
	* generic/tkIntPlatDecls.h:
	* generic/tkIntXlibDecls.h:
	* generic/tkPlatDecls.h:
	* generic/tkStubInit.c: regen

1 files changed, 1145 insertions, 0 deletions

diff --git a/macosx/tkMacOSXNotify.c b/macosx/tkMacOSXNotify.c
new file mode 100644
index 0000000..c8c5af9
--- /dev/null
+++ b/macosx/tkMacOSXNotify.c
@@ -0,0 +1,1145 @@
+/*
+ * tclMacOSXNotify.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.
+ *
+ * Copyright (c) 1995-1997 Sun Microsystems, Inc.
+ * Copyright 2001, Apple Computer, Inc.
+ *
+ * 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 1.2 2002/08/31 06:12:30 das Exp $
+ */
+
+#include "tclInt.h"
+#include "tclPort.h"
+
+/* FIXME - Why do I need these here? */
+
+#undef environ
+#include "tkMacOSX.h"
+#include "tkMacOSXEvent.h"
+#include <signal.h> 
+
+extern TclStubs tclStubs;
+
+/*
+ * 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;
+
+/*
+ * 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 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. */
+    fd_mask checkMasks[3*MASK_SIZE];
+				/* This array 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. */
+    fd_mask readyMasks[3*MASK_SIZE];
+				/* 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... */
+#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. */
+    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. */
+#endif
+} 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 
+ * 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;
+
+#endif
+
+/*
+ * Static routines defined in this file.
+ */
+
+#ifdef TCL_THREADS
+static void	NotifierThreadProc _ANSI_ARGS_((ClientData clientData));
+#endif
+static int	FileHandlerEventProc _ANSI_ARGS_((Tcl_Event *evPtr,
+		    int flags));
+                    
+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 ();
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkMacOSXSetupTkNotifier --
+ *
+ *	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.
+ *
+ * Results:
+ *	Replaces the notifier callbacks with MacOS X specific ones.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_MacOSXSetupTkNotifier()
+{
+    Tcl_NotifierProcs macNotifierProcs = {
+        TkMacOSXSetTimer,
+        TkMacOSXWaitForEvent,
+        TkMacOSXCreateFileHandler,
+        TkMacOSXDeleteFileHandler,
+        TkMacOSXInitNotifier,
+        TkMacOSXFinalizeNotifier,
+        TkMacOSXAlertNotifier,
+        TkMacOSXServiceModeHook
+    };
+    
+    Tcl_SetNotifier(&macNotifierProcs);
+
+    /* 
+     * 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);
+
+#ifdef TCL_THREADS
+    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) {
+	    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);
+#endif
+    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.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkMacOSXFinalizeNotifier(clientData)
+    ClientData clientData;		/* Not used. */
+{
+#ifdef TCL_THREADS
+    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) {
+	    panic("Tcl_FinalizeNotifier: notifier pipe not initialized");
+	}
+
+        /*
+	 * 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);
+#endif
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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;
+{
+#ifdef TCL_THREADS
+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData;
+    Tcl_MutexLock(&notifierMutex);
+    tsdPtr->eventReady = 1;
+    Tcl_ConditionNotify(&tsdPtr->waitCV);
+    Tcl_MutexUnlock(&notifierMutex);
+#endif
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tcl_SetTimer --
+ *
+ *	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.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+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. */
+{
+    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
+    FileHandler *filePtr;
+    int index, bit;
+
+    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.
+     */
+
+    index = fd/(NBBY*sizeof(fd_mask));
+    bit = 1 << (fd%(NBBY*sizeof(fd_mask)));
+    if (mask & TCL_READABLE) {
+	tsdPtr->checkMasks[index] |= bit;
+    } else {
+	tsdPtr->checkMasks[index] &= ~bit;
+    } 
+    if (mask & TCL_WRITABLE) {
+	(tsdPtr->checkMasks+MASK_SIZE)[index] |= bit;
+    } else {
+	(tsdPtr->checkMasks+MASK_SIZE)[index] &= ~bit;
+    }
+    if (mask & TCL_EXCEPTION) {
+	(tsdPtr->checkMasks+2*(MASK_SIZE))[index] |= bit;
+    } else {
+	(tsdPtr->checkMasks+2*(MASK_SIZE))[index] &= ~bit;
+    }
+    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
+TkMacOSXDeleteFileHandler(fd)
+    int fd;		/* Stream id for which to remove callback procedure. */
+{
+    FileHandler *filePtr, *prevPtr;
+    int index, bit, i;
+    unsigned long flags;
+    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.
+     */
+
+    index = fd/(NBBY*sizeof(fd_mask));
+    bit = 1 << (fd%(NBBY*sizeof(fd_mask)));
+
+    if (filePtr->mask & TCL_READABLE) {
+	tsdPtr->checkMasks[index] &= ~bit;
+    }
+    if (filePtr->mask & TCL_WRITABLE) {
+	(tsdPtr->checkMasks+MASK_SIZE)[index] &= ~bit;
+    }
+    if (filePtr->mask & TCL_EXCEPTION) {
+	(tsdPtr->checkMasks+2*(MASK_SIZE))[index] &= ~bit;
+    }
+
+    /*
+     * Find current max fd.
+     */
+
+    if (fd+1 == tsdPtr->numFdBits) {
+	for (tsdPtr->numFdBits = 0; index >= 0; index--) {
+	    flags = tsdPtr->checkMasks[index]
+		| (tsdPtr->checkMasks+MASK_SIZE)[index]
+		| (tsdPtr->checkMasks+2*(MASK_SIZE))[index];
+	    if (flags) {
+		for (i = (NBBY*sizeof(fd_mask)); i > 0; i--) {
+		    if (flags & (((unsigned long)1) << (i-1))) {
+			break;
+		    }
+		}
+		tsdPtr->numFdBits = index * (NBBY*sizeof(fd_mask)) + i;
+		break;
+	    }
+	}
+    }
+
+    /*
+     * Clean up information in the callback record.
+     */
+
+    if (prevPtr == NULL) {
+	tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
+    } else {
+	prevPtr->nextPtr = filePtr->nextPtr;
+    }
+    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;
+}
+
+void
+DoActualWait(timePtr)
+    Tcl_Time *timePtr;		/* Maximum block time, or NULL. */
+{
+    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
+    
+    if (!tsdPtr->isMainLoop) {
+            Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, timePtr);
+    } else {
+        EventRef eventRef;
+        EventTime waitTime;
+        Tcl_MutexUnlock(&notifierMutex);
+
+        if (timePtr == NULL) {
+            waitTime = kEventDurationForever;
+        } else {
+            waitTime = timePtr->sec * kEventDurationSecond 
+                    + timePtr->usec * kEventDurationMicrosecond;
+        }
+        ReceiveNextEvent(0, NULL, waitTime, false, &eventRef);
+        Tcl_MutexLock(&notifierMutex);
+    }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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
+TkMacOSXWaitForEvent(timePtr)
+    Tcl_Time *timePtr;		/* Maximum block time, or NULL. */
+{
+    FileHandler *filePtr;
+    FileHandlerEvent *fileEvPtr;
+    struct timeval timeout, *timeoutPtr;
+    int bit, index, mask;
+#ifdef TCL_THREADS
+    int waitForFiles;
+#else
+    int numFound;
+#endif
+    
+    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) {
+	timeout.tv_sec = timePtr->sec;
+	timeout.tv_usec = timePtr->usec;
+	timeoutPtr = &timeout;
+#ifndef TCL_THREADS
+    } 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;
+#endif
+    } else {
+	timeoutPtr = NULL;
+    }
+
+#ifdef TCL_THREADS
+    /*
+     * 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 (timePtr != NULL && timePtr->sec == 0 && timePtr->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;
+	timePtr = 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);
+    }
+
+    memset((VOID *) tsdPtr->readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));
+
+    if (!tsdPtr->eventReady) {
+        DoActualWait(timePtr);
+    }
+    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);
+    }
+
+    
+#else
+    memcpy((VOID *) tsdPtr->readyMasks, (VOID *) tsdPtr->checkMasks,
+	    3*MASK_SIZE*sizeof(fd_mask));
+    numFound = select(tsdPtr->numFdBits,
+	    (SELECT_MASK *) &tsdPtr->readyMasks[0],
+	    (SELECT_MASK *) &tsdPtr->readyMasks[MASK_SIZE],
+	    (SELECT_MASK *) &tsdPtr->readyMasks[2*MASK_SIZE], timeoutPtr);
+
+    /*
+     * Some systems don't clear the masks after an error, so
+     * we have to do it here.
+     */
+
+    if (numFound == -1) {
+	memset((VOID *) tsdPtr->readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));
+    }
+#endif
+
+    /*
+     * Queue all detected file events before returning.
+     */
+
+    for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL);
+	 filePtr = filePtr->nextPtr) {
+	index = filePtr->fd / (NBBY*sizeof(fd_mask));
+	bit = 1 << (filePtr->fd % (NBBY*sizeof(fd_mask)));
+	mask = 0;
+
+	if (tsdPtr->readyMasks[index] & bit) {
+	    mask |= TCL_READABLE;
+	}
+	if ((tsdPtr->readyMasks+MASK_SIZE)[index] & bit) {
+	    mask |= TCL_WRITABLE;
+	}
+	if ((tsdPtr->readyMasks+2*(MASK_SIZE))[index] & bit) {
+	    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;
+    }
+    
+    /* 
+     * Also queue the Mac Events found...
+     */
+    
+#ifdef TCL_THREADS
+    Tcl_MutexUnlock(&notifierMutex);
+#endif
+
+    if (tsdPtr->isMainLoop) {
+        TkMacOSXCountAndProcessMacEvents();
+    }
+    
+    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 void
+NotifierThreadProc(clientData)
+    ClientData clientData;	/* Not used. */
+{
+    ThreadSpecificData *tsdPtr;
+    fd_mask masks[3*MASK_SIZE];
+    long *maskPtr = (long *)masks;	/* masks[] cast to type long[] */
+    int fds[2];
+    int i, status, index, bit, numFdBits, found, receivePipe, word;
+    struct timeval poll = {0., 0.}, *timePtr;
+    int maskSize = 3 * ((MASK_SIZE) / sizeof(long)) * sizeof(fd_mask);
+    char buf[2];
+
+    if (pipe(fds) != 0) {
+	panic("NotifierThreadProc: could not create trigger pipe.");
+    }
+
+    receivePipe = fds[0];
+
+#ifndef USE_FIONBIO
+    status = fcntl(receivePipe, F_GETFL);
+    status |= O_NONBLOCK;
+    if (fcntl(receivePipe, F_SETFL, status) < 0) {
+	panic("NotifierThreadProc: could not make receive pipe non blocking.");
+    }
+    status = fcntl(fds[1], F_GETFL);
+    status |= O_NONBLOCK;
+    if (fcntl(fds[1], F_SETFL, status) < 0) {
+	panic("NotifierThreadProc: could not make trigger pipe non blocking.");
+    }
+#else
+    if (ioctl(receivePipe, (int) FIONBIO, &status) < 0) {
+	panic("NotifierThreadProc: could not make receive pipe non blocking.");
+    }
+    if (ioctl(fds[1], (int) FIONBIO, &status) < 0) {
+	panic("NotifierThreadProc: could not make trigger pipe non blocking.");
+    }
+#endif
+
+    /*
+     * 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) {
+	/*
+	 * Set up the select mask to include the receive pipe.
+	 */
+
+	memset((VOID *)masks, 0, 3*MASK_SIZE*sizeof(fd_mask));
+        numFdBits = receivePipe + 1;
+	index = receivePipe / (NBBY*sizeof(fd_mask));
+	bit = 1 << (receivePipe % (NBBY*sizeof(fd_mask)));
+	masks[index] |= bit;
+
+	/*
+	 * Add in the check masks from all of the waiting notifiers.
+	 */
+	
+	Tcl_MutexLock(&notifierMutex);
+	timePtr = NULL;
+        for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
+            for (i = 0; i < maskSize; i++) {
+                maskPtr[i] |= ((long*)tsdPtr->checkMasks)[i];
+            }
+            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);
+
+	maskSize = 3 * ((MASK_SIZE) / sizeof(long)) * sizeof(fd_mask);
+
+	if (select(numFdBits, (SELECT_MASK *) &masks[0],
+		(SELECT_MASK *) &masks[MASK_SIZE],
+		(SELECT_MASK *) &masks[2*MASK_SIZE], 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 = 0; i < maskSize; i++) {
+                word = maskPtr[i] & ((long*)tsdPtr->checkMasks)[i];
+                found |= word;
+                (((long*)(tsdPtr->readyMasks))[i]) = word;
+	    }
+            if (found || (tsdPtr->pollState & POLL_DONE)) {
+                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;
+                }
+                tsdPtr->eventReady = 1;
+                if (tsdPtr->isMainLoop) {
+                    /* We need to wake up the main loop, and let it have the event. */
+                    EventRef fakeEvent = TkMacOSXCreateFakeEvent();
+                    PostEventToQueue(GetMainEventQueue(), fakeEvent, kEventPriorityHigh);
+                    ReleaseEvent(fakeEvent);
+                } else {
+                    Tcl_ConditionNotify(&tsdPtr->waitCV);
+                }
+            }
+        }
+	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 (masks[index] & bit) {
+	    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);
+}
+#endif
+
+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) {
+        fprintf(stderr,"CreateEvent failed\n");
+        return NULL;
+    }
+    return eventRef;
+}