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// Copyright 2023 the V8 project 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 V8_BASE_PLATFORM_PLATFORM_WIN32_H_
#define V8_BASE_PLATFORM_PLATFORM_WIN32_H_
#include "src/base/platform/time.h"
namespace v8 {
namespace base {
// A timer which allows more precise sleep intervals. Sleeping on Windows is
// generally limited by the granularity of the system timer (64 Hz by default),
// but on Windows 10 version 1803 and newer, this class allows much shorter
// sleeps including sub-millisecond intervals.
class V8_BASE_EXPORT PreciseSleepTimer {
public:
PreciseSleepTimer();
~PreciseSleepTimer();
// Moving is supported but copying is not, because this class owns a
// platform handle.
PreciseSleepTimer(const PreciseSleepTimer& other) = delete;
PreciseSleepTimer& operator=(const PreciseSleepTimer& other) = delete;
PreciseSleepTimer(PreciseSleepTimer&& other) V8_NOEXCEPT;
PreciseSleepTimer& operator=(PreciseSleepTimer&& other) V8_NOEXCEPT;
// Attempts to initialize this timer. Precise timers are only available on
// Windows 10 version 1803 and later. To check whether initialization worked,
// use IsInitialized.
void TryInit();
bool IsInitialized() const;
// Sleeps for a specified time interval. This function requires that the timer
// has been initialized, as can be checked with IsInitialized. A single
// PreciseSleepTimer instance must not be used simultaneously on multiple
// threads.
void Sleep(TimeDelta interval) const;
private:
void Close();
HANDLE timer_;
};
} // namespace base
} // namespace v8
#endif // V8_BASE_PLATFORM_PLATFORM_WIN32_H_
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