The Tor Browser: widget/gonk/WidgetTraceEvent.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "mozilla/WidgetTraceEvent.h"

     6 #include "mozilla/StaticPtr.h"

     7 #include "nsThreadUtils.h"

     8 #include <mozilla/CondVar.h>

     9 #include <mozilla/Mutex.h>

    11 using mozilla::CondVar;

    12 using mozilla::Mutex;

    13 using mozilla::MutexAutoLock;

    15 namespace mozilla {

    16   class TracerRunnable : public nsRunnable {

    17     public:

    18       TracerRunnable() {

    19         mTracerLock = new Mutex("TracerRunnable");

    20         mTracerCondVar = new CondVar(*mTracerLock, "TracerRunnable");

    21         mMainThread = do_GetMainThread();

    22       }

    24       ~TracerRunnable() {

    25         delete mTracerCondVar;

    26         delete mTracerLock;

    27         mTracerLock = nullptr;

    28         mTracerCondVar = nullptr;

    29       }

    31       virtual nsresult Run() {

    32         MutexAutoLock lock(*mTracerLock);

    33         mHasRun = true;

    34         mTracerCondVar->Notify();

    35         return NS_OK;

    36       }

    38       bool Fire() {

    39         if (!mTracerLock || !mTracerCondVar) {

    40           return false;

    41         }

    43         MutexAutoLock lock(*mTracerLock);

    44         mHasRun = false;

    45         mMainThread->Dispatch(this, NS_DISPATCH_NORMAL);

    46         while (!mHasRun) {

    47           mTracerCondVar->Wait();

    48         }

    49         return true;

    50       }

    52       void Signal() {

    53         MutexAutoLock lock(*mTracerLock);

    54         mHasRun = true;

    55         mTracerCondVar->Notify();

    56       }

    58     private:

    59       Mutex* mTracerLock;

    60       CondVar* mTracerCondVar;

    61       bool mHasRun;

    62       nsCOMPtr<nsIThread> mMainThread;

    63   };

    65   StaticRefPtr<TracerRunnable> sTracerRunnable;

    67   bool InitWidgetTracing()

    68   {

    69     if (!sTracerRunnable) {

    70       sTracerRunnable = new TracerRunnable();

    71     }

    72     return true;

    73   }

    75   void CleanUpWidgetTracing()

    76   {

    77     sTracerRunnable = nullptr;

    78   }

    80   bool FireAndWaitForTracerEvent()

    81   {

    82     if (sTracerRunnable) {

    83       return sTracerRunnable->Fire();

    84     }

    86     return false;

    87   }

    89   void SignalTracerThread()

    90   {

    91     if (sTracerRunnable) {

    92       return sTracerRunnable->Signal();

    93     }

    94   }

    95 }  // namespace mozilla

The Tor Browser / file revision