1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/gonk/WidgetTraceEvent.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,96 @@
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 +#include "mozilla/StaticPtr.h"
1.10 +#include "nsThreadUtils.h"
1.11 +#include <mozilla/CondVar.h>
1.12 +#include <mozilla/Mutex.h>
1.13 +
1.14 +using mozilla::CondVar;
1.15 +using mozilla::Mutex;
1.16 +using mozilla::MutexAutoLock;
1.17 +
1.18 +namespace mozilla {
1.19 + class TracerRunnable : public nsRunnable {
1.20 + public:
1.21 + TracerRunnable() {
1.22 + mTracerLock = new Mutex("TracerRunnable");
1.23 + mTracerCondVar = new CondVar(*mTracerLock, "TracerRunnable");
1.24 + mMainThread = do_GetMainThread();
1.25 + }
1.26 +
1.27 + ~TracerRunnable() {
1.28 + delete mTracerCondVar;
1.29 + delete mTracerLock;
1.30 + mTracerLock = nullptr;
1.31 + mTracerCondVar = nullptr;
1.32 + }
1.33 +
1.34 + virtual nsresult Run() {
1.35 + MutexAutoLock lock(*mTracerLock);
1.36 + mHasRun = true;
1.37 + mTracerCondVar->Notify();
1.38 + return NS_OK;
1.39 + }
1.40 +
1.41 + bool Fire() {
1.42 + if (!mTracerLock || !mTracerCondVar) {
1.43 + return false;
1.44 + }
1.45 +
1.46 + MutexAutoLock lock(*mTracerLock);
1.47 + mHasRun = false;
1.48 + mMainThread->Dispatch(this, NS_DISPATCH_NORMAL);
1.49 + while (!mHasRun) {
1.50 + mTracerCondVar->Wait();
1.51 + }
1.52 + return true;
1.53 + }
1.54 +
1.55 + void Signal() {
1.56 + MutexAutoLock lock(*mTracerLock);
1.57 + mHasRun = true;
1.58 + mTracerCondVar->Notify();
1.59 + }
1.60 +
1.61 + private:
1.62 + Mutex* mTracerLock;
1.63 + CondVar* mTracerCondVar;
1.64 + bool mHasRun;
1.65 + nsCOMPtr<nsIThread> mMainThread;
1.66 + };
1.67 +
1.68 + StaticRefPtr<TracerRunnable> sTracerRunnable;
1.69 +
1.70 + bool InitWidgetTracing()
1.71 + {
1.72 + if (!sTracerRunnable) {
1.73 + sTracerRunnable = new TracerRunnable();
1.74 + }
1.75 + return true;
1.76 + }
1.77 +
1.78 + void CleanUpWidgetTracing()
1.79 + {
1.80 + sTracerRunnable = nullptr;
1.81 + }
1.82 +
1.83 + bool FireAndWaitForTracerEvent()
1.84 + {
1.85 + if (sTracerRunnable) {
1.86 + return sTracerRunnable->Fire();
1.87 + }
1.88 +
1.89 + return false;
1.90 + }
1.91 +
1.92 + void SignalTracerThread()
1.93 + {
1.94 + if (sTracerRunnable) {
1.95 + return sTracerRunnable->Signal();
1.96 + }
1.97 + }
1.98 +} // namespace mozilla
1.99 +
