bff1453282
The precision of sleep_for and wait_for is limited to 1-1.5ms on Windows. Using SleepForOneTick() allows us to sleep for exactly one interval of the current timer resolution. This allows us to take advantage of systems that have a timer resolution of 0.5ms to reduce CPU overhead in the event loop.
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#pragma once
|
|
|
|
#include <chrono>
|
|
#include <memory>
|
|
|
|
#include "common/common_types.h"
|
|
|
|
namespace Common {
|
|
|
|
class WallClock {
|
|
public:
|
|
static constexpr u64 NS_RATIO = 1'000'000'000;
|
|
static constexpr u64 US_RATIO = 1'000'000;
|
|
static constexpr u64 MS_RATIO = 1'000;
|
|
|
|
virtual ~WallClock() = default;
|
|
|
|
/// Returns current wall time in nanoseconds
|
|
[[nodiscard]] virtual std::chrono::nanoseconds GetTimeNS() = 0;
|
|
|
|
/// Returns current wall time in microseconds
|
|
[[nodiscard]] virtual std::chrono::microseconds GetTimeUS() = 0;
|
|
|
|
/// Returns current wall time in milliseconds
|
|
[[nodiscard]] virtual std::chrono::milliseconds GetTimeMS() = 0;
|
|
|
|
/// Returns current wall time in emulated clock cycles
|
|
[[nodiscard]] virtual u64 GetClockCycles() = 0;
|
|
|
|
/// Returns current wall time in emulated cpu cycles
|
|
[[nodiscard]] virtual u64 GetCPUCycles() = 0;
|
|
|
|
virtual void Pause(bool is_paused) = 0;
|
|
|
|
/// Tells if the wall clock, uses the host CPU's hardware clock
|
|
[[nodiscard]] bool IsNative() const {
|
|
return is_native;
|
|
}
|
|
|
|
protected:
|
|
explicit WallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_, bool is_native_)
|
|
: emulated_cpu_frequency{emulated_cpu_frequency_},
|
|
emulated_clock_frequency{emulated_clock_frequency_}, is_native{is_native_} {}
|
|
|
|
u64 emulated_cpu_frequency;
|
|
u64 emulated_clock_frequency;
|
|
|
|
private:
|
|
bool is_native;
|
|
};
|
|
|
|
[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
|
u64 emulated_clock_frequency);
|
|
|
|
[[nodiscard]] std::unique_ptr<WallClock> CreateStandardWallClock(u64 emulated_cpu_frequency,
|
|
u64 emulated_clock_frequency);
|
|
|
|
} // namespace Common
|