1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/gtk/WidgetTraceEvent.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,78 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "mozilla/WidgetTraceEvent.h"
1.9 +
1.10 +#include <glib.h>
1.11 +#include <mozilla/CondVar.h>
1.12 +#include <mozilla/Mutex.h>
1.13 +#include <stdio.h>
1.14 +
1.15 +using mozilla::CondVar;
1.16 +using mozilla::Mutex;
1.17 +using mozilla::MutexAutoLock;
1.18 +
1.19 +namespace {
1.20 +
1.21 +Mutex* sMutex = nullptr;
1.22 +CondVar* sCondVar = nullptr;
1.23 +bool sTracerProcessed = false;
1.24 +
1.25 +// This function is called from the main (UI) thread.
1.26 +gboolean TracerCallback(gpointer data)
1.27 +{
1.28 + mozilla::SignalTracerThread();
1.29 + return FALSE;
1.30 +}
1.31 +
1.32 +} // namespace
1.33 +
1.34 +namespace mozilla {
1.35 +
1.36 +bool InitWidgetTracing()
1.37 +{
1.38 + sMutex = new Mutex("Event tracer thread mutex");
1.39 + sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
1.40 + return sMutex && sCondVar;
1.41 +}
1.42 +
1.43 +void CleanUpWidgetTracing()
1.44 +{
1.45 + delete sMutex;
1.46 + delete sCondVar;
1.47 + sMutex = nullptr;
1.48 + sCondVar = nullptr;
1.49 +}
1.50 +
1.51 +// This function is called from the background tracer thread.
1.52 +bool FireAndWaitForTracerEvent()
1.53 +{
1.54 + NS_ABORT_IF_FALSE(sMutex && sCondVar, "Tracing not initialized!");
1.55 +
1.56 + // Send a default-priority idle event through the
1.57 + // event loop, and wait for it to finish.
1.58 + MutexAutoLock lock(*sMutex);
1.59 + NS_ABORT_IF_FALSE(!sTracerProcessed, "Tracer synchronization state is wrong");
1.60 + g_idle_add_full(G_PRIORITY_DEFAULT,
1.61 + TracerCallback,
1.62 + nullptr,
1.63 + nullptr);
1.64 + while (!sTracerProcessed)
1.65 + sCondVar->Wait();
1.66 + sTracerProcessed = false;
1.67 + return true;
1.68 +}
1.69 +
1.70 +void SignalTracerThread()
1.71 +{
1.72 + if (!sMutex || !sCondVar)
1.73 + return;
1.74 + MutexAutoLock lock(*sMutex);
1.75 + if (!sTracerProcessed) {
1.76 + sTracerProcessed = true;
1.77 + sCondVar->Notify();
1.78 + }
1.79 +}
1.80 +
1.81 +} // namespace mozilla
