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/*
* tkMacOSXNotify.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 (c) 2005-2007 Daniel A. Steffen <das@users.sourceforge.net>
*
* 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 1.21 2008/11/08 18:44:40 dkf Exp $
*/
#include "tkMacOSXPrivate.h"
#include "tkMacOSXEvent.h"
#include <pthread.h>
/*
* The following static indicates whether this module has been initialized
* in the current thread.
*/
typedef struct ThreadSpecificData {
int initialized;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
static void TkMacOSXNotifyExitHandler(ClientData clientData);
static void CarbonEventsSetupProc(ClientData clientData, int flags);
static void CarbonEventsCheckProc(ClientData clientData, int flags);
/*
*----------------------------------------------------------------------
*
* Tk_MacOSXSetupTkNotifier --
*
* This procedure is called during Tk initialization to create
* the event source for Carbon events.
*
* Results:
* None.
*
* Side effects:
* A new event source is created.
*
*----------------------------------------------------------------------
*/
void
Tk_MacOSXSetupTkNotifier(void)
{
ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey,
sizeof(ThreadSpecificData));
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.
*/
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);
}
}
}
/*
*----------------------------------------------------------------------
*
* TkMacOSXNotifyExitHandler --
*
* This function is called during finalization to clean up the
* TkMacOSXNotify module.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
TkMacOSXNotifyExitHandler(
ClientData clientData) /* Not used. */
{
ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey,
sizeof(ThreadSpecificData));
Tcl_DeleteEventSource(CarbonEventsSetupProc,
CarbonEventsCheckProc, GetMainEventQueue());
tsdPtr->initialized = 0;
}
/*
*----------------------------------------------------------------------
*
* CarbonEventsSetupProc --
*
* 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 Carbon events are queued, then the maximum block time will be set
* to 0 to ensure that the notifier returns control to Tcl.
*
*----------------------------------------------------------------------
*/
static void
CarbonEventsSetupProc(
ClientData clientData,
int flags)
{
static Tcl_Time blockTime = { 0, 0 };
if (!(flags & TCL_WINDOW_EVENTS)) {
return;
}
if (GetNumEventsInQueue((EventQueueRef) clientData)) {
Tcl_SetMaxBlockTime(&blockTime);
}
}
/*
*----------------------------------------------------------------------
*
* CarbonEventsCheckProc --
*
* This procedure processes events sitting in the Carbon event queue.
*
* Results:
* None.
*
* Side effects:
* Moves applicable queued Carbon events onto the Tcl event queue.
*
*----------------------------------------------------------------------
*/
static void
CarbonEventsCheckProc(
ClientData clientData,
int flags)
{
int numFound;
OSStatus err = noErr;
if (!(flags & TCL_WINDOW_EVENTS)) {
return;
}
numFound = GetNumEventsInQueue((EventQueueRef) clientData);
/*
* Avoid starving other event sources:
*/
if (numFound > 4) {
numFound = 4;
}
while (numFound > 0 && err == noErr) {
err = TkMacOSXReceiveAndDispatchEvent();
numFound--;
}
}
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