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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include <Cocoa/Cocoa.h>
#include "CustomCocoaEvents.h"
#include <Foundation/NSAutoreleasePool.h>
#include <mozilla/CondVar.h>
#include <mozilla/Mutex.h>
#include "mozilla/WidgetTraceEvent.h"
using mozilla::CondVar;
using mozilla::Mutex;
using mozilla::MutexAutoLock;
namespace {
Mutex* sMutex = NULL;
CondVar* sCondVar = NULL;
bool sTracerProcessed = false;
} // namespace
namespace mozilla {
bool InitWidgetTracing() {
sMutex = new Mutex("Event tracer thread mutex");
sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
return sMutex && sCondVar;
void CleanUpWidgetTracing() {
delete sMutex;
delete sCondVar;
sMutex = NULL;
sCondVar = NULL;
// This function is called from the main (UI) thread.
void SignalTracerThread() {
if (!sMutex || !sCondVar) return;
MutexAutoLock lock(*sMutex);
if (!sTracerProcessed) {
sTracerProcessed = true;
// This function is called from the background tracer thread.
bool FireAndWaitForTracerEvent() {
MOZ_ASSERT(sMutex && sCondVar, "Tracing not initialized!");
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
MutexAutoLock lock(*sMutex);
if (sTracerProcessed) {
// Things are out of sync. This is likely because we're in
// the middle of shutting down. Just return false and hope the
// tracer thread is quitting anyway.
return false;
// Post an application-defined event to the main thread's event queue
// and wait for it to get processed.
[NSApp postEvent:[NSEvent otherEventWithType:NSEventTypeApplicationDefined
location:NSMakePoint(0, 0)
while (!sTracerProcessed) sCondVar->Wait();
sTracerProcessed = false;
[pool release];
return true;
} // namespace mozilla