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/synchronization/waitable_event.h"
   9 #include "base/trace_event/trace_event_impl.h"
  10 #include "content/common/content_export.h"
  11
  12 namespace content {
  13
  14 class Sampler;
  15 class V8SamplingThread;
  16
  17 // The class monitors enablement of V8 CPU profiler and
  18 // spawns a sampling thread when needed.
  19 class CONTENT_EXPORT V8SamplingProfiler final
  20     : public base::trace_event::TraceLog::EnabledStateObserver {
  21  public:
  22   explicit V8SamplingProfiler(bool underTest = false);
  23   ~V8SamplingProfiler();
  24
  25   // Implementation of TraceLog::EnabledStateObserver
  26   void OnTraceLogEnabled() override;
  27   void OnTraceLogDisabled() override;
  28
  29   void EnableSamplingEventForTesting(int code_added_events, int sample_events);
  30   void WaitSamplingEventForTesting();
  31
  32  private:
  33   void StartSamplingThread();
  34
  35   scoped_ptr<base::WaitableEvent> waitable_event_for_testing_;
  36   scoped_ptr<V8SamplingThread> sampling_thread_;
  37   scoped_ptr<Sampler> render_thread_sampler_;
  38   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
  39
  40   DISALLOW_COPY_AND_ASSIGN(V8SamplingProfiler);
  41 };
  42
  43 }  // namespace content
  44
  45 #endif  // CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_