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Further improve sleep accuracy on UNIX systems

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This commit is contained in:
Gustaf Alhäll 2025-01-04 20:12:00 +01:00
parent 3e6862b1c2
commit c00d139e55
1 changed files with 15 additions and 7 deletions
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22
src/sdl/i_system.c
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@ -2309,13 +2309,21 @@ void I_SleepDuration(precise_t duration)
{
#if defined(__linux__) || defined(__FreeBSD__) || defined(__HAIKU__)
UINT64 precision = I_GetPrecisePrecision();
struct timespec ts = {
.tv_sec = duration / precision,
.tv_nsec = duration * 1000000000 / precision % 1000000000,
};
int status;
do status = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &ts);
while (status == EINTR);
precise_t dest = I_GetPreciseTime() + duration;
if (duration > 100000)
{
duration -= 100000; // 0.1 ms slack
struct timespec ts = {
.tv_sec = duration / precision,
.tv_nsec = duration * 1000000000 / precision % 1000000000,
};
int status;
do status = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &ts);
while (status == EINTR);
}
// busy-wait the rest
while (((INT64)dest - (INT64)I_GetPreciseTime()) > 0);
#elif defined (MIN_SLEEP_DURATION_MS)
UINT64 precision = I_GetPrecisePrecision();
INT32 sleepvalue = cv_sleep.value;