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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_UTIL_THREAD_CPU_THROTTLER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_UTIL_THREAD_CPU_THROTTLER_H_
#include <memory>
#include "base/macros.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
};
namespace blink {
namespace scheduler {
// This class is used to slow down the main thread for
// inspector "cpu throttling". It does it by spawning an
// additional thread which frequently interrupts main thread
// and sleeps.
class PLATFORM_EXPORT ThreadCPUThrottler final {
public:
static ThreadCPUThrottler* GetInstance();
// |rate| is a slow-down factor - passing 2.0 will make
// everything two times slower.
// Any rate less or equal to 1.0 disables throttling and
// cleans up helper thread.
void SetThrottlingRate(double rate);
private:
ThreadCPUThrottler();
~ThreadCPUThrottler();
friend struct base::DefaultSingletonTraits<ThreadCPUThrottler>;
class ThrottlingThread;
std::unique_ptr<ThrottlingThread> throttling_thread_;
DISALLOW_COPY_AND_ASSIGN(ThreadCPUThrottler);
};
} // namespace scheduler
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_UTIL_THREAD_CPU_THROTTLER_H_
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