/* * 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 * * 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 1.1.1.2 2009/03/24 10:20:28 duncan Exp $ */ #include "tkMacOSXPrivate.h" #include "tkMacOSXEvent.h" #include /* * 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 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, flags) 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, flags) 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--; } }