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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 "mozilla/WidgetTraceEvent.h"
#include <glib.h>
#include <mozilla/CondVar.h>
#include <mozilla/Mutex.h>
#include <stdio.h>
using mozilla::CondVar;
using mozilla::Mutex;
using mozilla::MutexAutoLock;
namespace {
Mutex* sMutex = nullptr;
CondVar* sCondVar = nullptr;
bool sTracerProcessed = false;
// This function is called from the main (UI) thread.
gboolean TracerCallback(gpointer data) {
return FALSE;
} // namespace
namespace mozilla {
bool InitWidgetTracing() {
sMutex = new Mutex("Event tracer thread mutex");
sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
return true;
void CleanUpWidgetTracing() {
delete sMutex;
delete sCondVar;
sMutex = nullptr;
sCondVar = nullptr;
// This function is called from the background tracer thread.
bool FireAndWaitForTracerEvent() {
MOZ_ASSERT(sMutex && sCondVar, "Tracing not initialized!");
// Send a default-priority idle event through the
// event loop, and wait for it to finish.
MutexAutoLock lock(*sMutex);
MOZ_ASSERT(!sTracerProcessed, "Tracer synchronization state is wrong");
g_idle_add_full(G_PRIORITY_DEFAULT, TracerCallback, nullptr, nullptr);
while (!sTracerProcessed) sCondVar->Wait();
sTracerProcessed = false;
return true;
void SignalTracerThread() {
if (!sMutex || !sCondVar) return;
MutexAutoLock lock(*sMutex);
if (!sTracerProcessed) {
sTracerProcessed = true;
} // namespace mozilla