content/renderer/devtools/v8_sampling_profiler.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_
   6 #define CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_
   7
   8 #include "base/single_thread_task_runner.h"
   9 #include "base/synchronization/waitable_event.h"
  10 #include "base/trace_event/trace_log.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace content {
  14
  15 class Sampler;
  16 class V8SamplingThread;
  17
  18 // The class monitors enablement of V8 CPU profiler and
  19 // spawns a sampling thread when needed.
  20 class CONTENT_EXPORT V8SamplingProfiler final
  21     : public base::trace_event::TraceLog::EnabledStateObserver {
  22  public:
  23   explicit V8SamplingProfiler(bool underTest = false);
  24   ~V8SamplingProfiler() override;
  25
  26   // Implementation of TraceLog::EnabledStateObserver
  27   void OnTraceLogEnabled() override;
  28   void OnTraceLogDisabled() override;
  29
  30   void EnableSamplingEventForTesting(int code_added_events, int sample_events);
  31   void WaitSamplingEventForTesting();
  32
  33  private:
  34   void StartSamplingThread();
  35   void StopSamplingThread();
  36
  37   scoped_ptr<base::WaitableEvent> waitable_event_for_testing_;
  38   scoped_ptr<V8SamplingThread> sampling_thread_;
  39   scoped_ptr<Sampler> render_thread_sampler_;
  40   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(V8SamplingProfiler);
  43 };
  44
  45 }  // namespace content
  46
  47 #endif  // CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_