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Merge branch 'improve-sleep-accuracy' into 'next'

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Further improve sleep accuracy on UNIX systems

Closes #1210

See merge request STJr/SRB2!2583
This commit is contained in:
Alam Ed Arias 2025-01-10 06:56:03 +00:00
commit 209ba5e7cf
2 changed files with 32 additions and 14 deletions
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23
src/dedicated/i_system.c
View file

@ -379,13 +379,22 @@ 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;
precise_t slack = (precision / 5000); // 0.2 ms slack
if (duration > slack)
{
duration -= 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);
#else
UINT64 precision = I_GetPrecisePrecision();
INT32 sleepvalue = cv_sleep.value;

23
src/sdl/i_system.c
View file

@ -2302,13 +2302,22 @@ 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;
precise_t slack = (precision / 5000); // 0.2 ms slack
if (duration > slack)
{
duration -= 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;