mirror of
https://github.com/elmasas/lcs-recomp
synced 2026-10-23 16:08:20 -04:00
elmasas
41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#include "lcs_frame_limit.hpp"
|
|
|
|
#include <thread>
|
|
|
|
#if defined(_WIN32)
|
|
#ifndef WIN32_LEAN_AND_MEAN
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#endif
|
|
#ifndef NOMINMAX
|
|
#define NOMINMAX
|
|
#endif
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
namespace lcs {
|
|
|
|
void precise_sleep_until(std::chrono::steady_clock::time_point deadline) noexcept {
|
|
#if defined(_WIN32)
|
|
thread_local HANDLE timer = CreateWaitableTimerExW(
|
|
nullptr, nullptr, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
|
|
if (timer == nullptr) {
|
|
std::this_thread::sleep_until(deadline);
|
|
return;
|
|
}
|
|
constexpr auto kSpinMargin = std::chrono::microseconds(500);
|
|
const auto remaining = deadline - std::chrono::steady_clock::now() - kSpinMargin;
|
|
if (remaining > std::chrono::steady_clock::duration::zero()) {
|
|
LARGE_INTEGER due{};
|
|
due.QuadPart = -static_cast<LONGLONG>(
|
|
std::chrono::duration_cast<std::chrono::nanoseconds>(remaining).count() / 100);
|
|
if (SetWaitableTimerEx(timer, &due, 0, nullptr, nullptr, nullptr, 0))
|
|
WaitForSingleObject(timer, INFINITE);
|
|
}
|
|
while (std::chrono::steady_clock::now() < deadline) YieldProcessor();
|
|
#else
|
|
std::this_thread::sleep_until(deadline);
|
|
#endif
|
|
}
|
|
|
|
}
|