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SDL_DelayNS() will attempt to sleep exactly the requested amount of time

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This provides a highly accurate sleep function for your application, although you are still subject to being switched out occasionally.

Fixes https://github.com/libsdl-org/SDL/issues/10210
This commit is contained in:
Sam Lantinga
2024-07-15 18:05:31 -07:00
parent 54366181c3
commit 033df70d4c
12 changed files with 62 additions and 11 deletions
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23
src/timer/SDL_timer.c
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@@ -643,5 +643,26 @@ Uint64 SDL_GetTicks(void)
void SDL_Delay(Uint32 ms)
{
SDL_DelayNS(SDL_MS_TO_NS(ms));
SDL_SYS_DelayNS(SDL_MS_TO_NS(ms));
}
void SDL_DelayNS(Uint64 ns)
{
Uint64 current_value = SDL_GetTicksNS();
Uint64 target_value = current_value + ns;
// Sleep for a short number of cycles
// We'll use 1 ms as a scheduling timeslice, it's a good value for modern operating systems
const int SCHEDULING_TIMESLICE_NS = 1 * SDL_NS_PER_MS;
while (current_value < target_value) {
Uint64 remaining_ns = (target_value - current_value);
if (remaining_ns > (SCHEDULING_TIMESLICE_NS + SDL_NS_PER_US)) {
// Sleep for a short time, less than the scheduling timeslice
SDL_SYS_DelayNS(SCHEDULING_TIMESLICE_NS - SDL_NS_PER_US);
} else {
// Spin for any remaining time
SDL_CPUPauseInstruction();
}
current_value = SDL_GetTicksNS();
}
}