michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <Cocoa/Cocoa.h>
michael@0: #include "CustomCocoaEvents.h"
michael@0: #include <Foundation/NSAutoreleasePool.h>
michael@0: #include <mozilla/CondVar.h>
michael@0: #include <mozilla/Mutex.h>
michael@0: #include "mozilla/WidgetTraceEvent.h"
michael@0: 
michael@0: using mozilla::CondVar;
michael@0: using mozilla::Mutex;
michael@0: using mozilla::MutexAutoLock;
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: Mutex* sMutex = NULL;
michael@0: CondVar* sCondVar = NULL;
michael@0: bool sTracerProcessed = false;
michael@0: 
michael@0: }
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: bool InitWidgetTracing()
michael@0: {
michael@0:   sMutex = new Mutex("Event tracer thread mutex");
michael@0:   sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
michael@0:   return sMutex && sCondVar;
michael@0: }
michael@0: 
michael@0: void CleanUpWidgetTracing()
michael@0: {
michael@0:   delete sMutex;
michael@0:   delete sCondVar;
michael@0:   sMutex = NULL;
michael@0:   sCondVar = NULL;
michael@0: }
michael@0: 
michael@0: // This function is called from the main (UI) thread.
michael@0: void SignalTracerThread()
michael@0: {
michael@0:   if (!sMutex || !sCondVar)
michael@0:     return;
michael@0:   MutexAutoLock lock(*sMutex);
michael@0:   if (!sTracerProcessed) {
michael@0:     sTracerProcessed = true;
michael@0:     sCondVar->Notify();
michael@0:   }
michael@0: }
michael@0: 
michael@0: // This function is called from the background tracer thread.
michael@0: bool FireAndWaitForTracerEvent()
michael@0: {
michael@0:   NS_ABORT_IF_FALSE(sMutex && sCondVar, "Tracing not initialized!");
michael@0:   NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
michael@0:   MutexAutoLock lock(*sMutex);
michael@0:   if (sTracerProcessed) {
michael@0:     // Things are out of sync. This is likely because we're in
michael@0:     // the middle of shutting down. Just return false and hope the
michael@0:     // tracer thread is quitting anyway.
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   // Post an application-defined event to the main thread's event queue
michael@0:   // and wait for it to get processed.
michael@0:   [NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
michael@0:                                       location:NSMakePoint(0,0)
michael@0:                                  modifierFlags:0
michael@0:                                      timestamp:0
michael@0:                                   windowNumber:0
michael@0:                                        context:NULL
michael@0:                                        subtype:kEventSubtypeTrace
michael@0:                                          data1:0
michael@0:                                          data2:0]
michael@0:              atStart:NO];
michael@0:   while (!sTracerProcessed)
michael@0:     sCondVar->Wait();
michael@0:   sTracerProcessed = false;
michael@0:   [pool release];
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: }  // namespace mozilla