summaryrefslogtreecommitdiffstats
path: root/widget/gonk/WidgetTraceEvent.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'widget/gonk/WidgetTraceEvent.cpp')
-rw-r--r--widget/gonk/WidgetTraceEvent.cpp96
1 files changed, 96 insertions, 0 deletions
diff --git a/widget/gonk/WidgetTraceEvent.cpp b/widget/gonk/WidgetTraceEvent.cpp
new file mode 100644
index 000000000..558d9313e
--- /dev/null
+++ b/widget/gonk/WidgetTraceEvent.cpp
@@ -0,0 +1,96 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/WidgetTraceEvent.h"
+#include "mozilla/StaticPtr.h"
+#include "nsThreadUtils.h"
+#include <mozilla/CondVar.h>
+#include <mozilla/Mutex.h>
+
+using mozilla::CondVar;
+using mozilla::Mutex;
+using mozilla::MutexAutoLock;
+
+namespace mozilla {
+ class TracerRunnable : public Runnable {
+ public:
+ TracerRunnable() {
+ mTracerLock = new Mutex("TracerRunnable");
+ mTracerCondVar = new CondVar(*mTracerLock, "TracerRunnable");
+ mMainThread = do_GetMainThread();
+ }
+
+ ~TracerRunnable() {
+ delete mTracerCondVar;
+ delete mTracerLock;
+ mTracerLock = nullptr;
+ mTracerCondVar = nullptr;
+ }
+
+ virtual nsresult Run() {
+ MutexAutoLock lock(*mTracerLock);
+ mHasRun = true;
+ mTracerCondVar->Notify();
+ return NS_OK;
+ }
+
+ bool Fire() {
+ if (!mTracerLock || !mTracerCondVar) {
+ return false;
+ }
+
+ MutexAutoLock lock(*mTracerLock);
+ mHasRun = false;
+ mMainThread->Dispatch(this, NS_DISPATCH_NORMAL);
+ while (!mHasRun) {
+ mTracerCondVar->Wait();
+ }
+ return true;
+ }
+
+ void Signal() {
+ MutexAutoLock lock(*mTracerLock);
+ mHasRun = true;
+ mTracerCondVar->Notify();
+ }
+
+ private:
+ Mutex* mTracerLock;
+ CondVar* mTracerCondVar;
+ bool mHasRun;
+ nsCOMPtr<nsIThread> mMainThread;
+ };
+
+ StaticRefPtr<TracerRunnable> sTracerRunnable;
+
+ bool InitWidgetTracing()
+ {
+ if (!sTracerRunnable) {
+ sTracerRunnable = new TracerRunnable();
+ }
+ return true;
+ }
+
+ void CleanUpWidgetTracing()
+ {
+ sTracerRunnable = nullptr;
+ }
+
+ bool FireAndWaitForTracerEvent()
+ {
+ if (sTracerRunnable) {
+ return sTracerRunnable->Fire();
+ }
+
+ return false;
+ }
+
+ void SignalTracerThread()
+ {
+ if (sTracerRunnable) {
+ return sTracerRunnable->Signal();
+ }
+ }
+} // namespace mozilla
+