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perf: limit high-resolution sleep busy-waiting

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This commit is contained in:
nmzik
2026-08-07 17:44:55 +02:00
parent 7907a50817
commit 216c580d13
3 changed files with 16 additions and 24 deletions
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src/graphics/presentation/videoOut.cpp
+4 -8
View File
@@ -788,14 +788,10 @@ void VideoOutDriver::Impl::PresentThread(std::stop_token token) {
while (!token.stop_requested()) {
const auto sleep_begin = Common::Timer::QueryPerformanceCounter();
if (total_wait > 0) {
const auto sleep_end = sleep_begin + static_cast<uint64_t>(total_wait);
auto now = sleep_begin;
while (!token.stop_requested() && now < sleep_end) {
const auto remaining_us = (sleep_end - now) * 1000000u / frequency;
Common::Thread::SleepMicro(
static_cast<uint32_t>(std::clamp<uint64_t>(remaining_us, 1, 1000)));
now = Common::Timer::QueryPerformanceCounter();
}
const auto remaining_us =
(static_cast<uint64_t>(total_wait) * 1000000u + frequency - 1) / frequency;
Common::Thread::SleepMicro(static_cast<uint32_t>(
std::clamp<uint64_t>(remaining_us, 1, std::numeric_limits<uint32_t>::max())));
}
if (token.stop_requested()) {
break;
src/graphics/presentation/window/window.cpp
+6 -14
View File
@@ -752,26 +752,18 @@ void WindowContext::Run() {
#if defined(__APPLE__)
DrainMainThreadTasks();
#endif
if (SDL_PollEvent(&loop.event) != 0) {
ProcessEvent(timer.GetTimeS());
continue;
}
if (loop.paused.load(std::memory_order_acquire)) {
if (!timer.IsPaused()) {
timer.Pause();
}
if (SDL_WaitEvent(&loop.event) == 0) {
EXIT("%s\n", SDL_GetError());
}
ProcessEvent(timer.GetTimeS());
continue;
}
if (timer.IsPaused()) {
} else if (timer.IsPaused()) {
timer.Resume();
}
Common::Thread::SleepMicro(1000);
if (SDL_WaitEvent(&loop.event) == 0) {
EXIT("%s\n", SDL_GetError());
}
ProcessEvent(timer.GetTimeS());
}
}