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https://github.com/mozilla/gecko-dev.git
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79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/WidgetTraceEvent.h"
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#include <glib.h>
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#include <mozilla/CondVar.h>
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#include <mozilla/Mutex.h>
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#include <stdio.h>
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using mozilla::CondVar;
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using mozilla::Mutex;
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using mozilla::MutexAutoLock;
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namespace {
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Mutex* sMutex = nullptr;
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CondVar* sCondVar = nullptr;
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bool sTracerProcessed = false;
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// This function is called from the main (UI) thread.
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gboolean TracerCallback(gpointer data)
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{
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mozilla::SignalTracerThread();
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return FALSE;
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}
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} // namespace
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namespace mozilla {
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bool InitWidgetTracing()
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{
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sMutex = new Mutex("Event tracer thread mutex");
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sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
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return sMutex && sCondVar;
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}
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void CleanUpWidgetTracing()
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{
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delete sMutex;
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delete sCondVar;
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sMutex = nullptr;
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sCondVar = nullptr;
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}
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// This function is called from the background tracer thread.
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bool FireAndWaitForTracerEvent()
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{
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NS_ABORT_IF_FALSE(sMutex && sCondVar, "Tracing not initialized!");
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// Send a default-priority idle event through the
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// event loop, and wait for it to finish.
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MutexAutoLock lock(*sMutex);
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NS_ABORT_IF_FALSE(!sTracerProcessed, "Tracer synchronization state is wrong");
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g_idle_add_full(G_PRIORITY_DEFAULT,
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TracerCallback,
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nullptr,
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nullptr);
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while (!sTracerProcessed)
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sCondVar->Wait();
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sTracerProcessed = false;
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return true;
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}
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void SignalTracerThread()
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{
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if (!sMutex || !sCondVar)
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return;
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MutexAutoLock lock(*sMutex);
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if (!sTracerProcessed) {
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sTracerProcessed = true;
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sCondVar->Notify();
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}
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}
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} // namespace mozilla
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