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Use nanosleep for I_SleepDuration on *nix

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Gustaf Alhäll 2023-10-26 23:43:07 +02:00
parent a68440c4db
commit b98d9dfe52
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GPG key ID: 6C1F67D690CDEDFD
2 changed files with 46 additions and 35 deletions
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35
src/i_time.c
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@ -88,38 +88,3 @@ void I_UpdateTime(fixed_t timescale)
g_time.timefrac = FLOAT_TO_FIXED(fractional); g_time.timefrac = FLOAT_TO_FIXED(fractional);
} }
} }
void I_SleepDuration(precise_t duration)
{
UINT64 precision = I_GetPrecisePrecision();
INT32 sleepvalue = cv_sleep.value;
UINT64 delaygranularity;
precise_t cur;
precise_t dest;
{
double gran = round(((double)(precision / 1000) * sleepvalue * MIN_SLEEP_DURATION_MS));
delaygranularity = (UINT64)gran;
}
cur = I_GetPreciseTime();
dest = cur + duration;
// the reason this is not dest > cur is because the precise counter may wrap
// two's complement arithmetic is our friend here, though!
// e.g. cur 0xFFFFFFFFFFFFFFFE = -2, dest 0x0000000000000001 = 1
// 0x0000000000000001 - 0xFFFFFFFFFFFFFFFE = 3
while ((INT64)(dest - cur) > 0)
{
// If our cv_sleep value exceeds the remaining sleep duration, use the
// hard sleep function.
if (sleepvalue > 0 && (dest - cur) > delaygranularity)
{
I_Sleep(sleepvalue);
}
// Otherwise, this is a spinloop.
cur = I_GetPreciseTime();
}
}

46
src/sdl/i_system.c
View file

@ -2265,6 +2265,52 @@ void I_Sleep(UINT32 ms)
SDL_Delay(ms); SDL_Delay(ms);
} }
void I_SleepDuration(precise_t duration)
{
#if defined(__linux__) || defined(__FreeBSD__)
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);
#else
UINT64 precision = I_GetPrecisePrecision();
INT32 sleepvalue = cv_sleep.value;
UINT64 delaygranularity;
precise_t cur;
precise_t dest;
{
double gran = round(((double)(precision / 1000) * sleepvalue * MIN_SLEEP_DURATION_MS));
delaygranularity = (UINT64)gran;
}
cur = I_GetPreciseTime();
dest = cur + duration;
// the reason this is not dest > cur is because the precise counter may wrap
// two's complement arithmetic is our friend here, though!
// e.g. cur 0xFFFFFFFFFFFFFFFE = -2, dest 0x0000000000000001 = 1
// 0x0000000000000001 - 0xFFFFFFFFFFFFFFFE = 3
while ((INT64)(dest - cur) > 0)
{
// If our cv_sleep value exceeds the remaining sleep duration, use the
// hard sleep function.
if (sleepvalue > 0 && (dest - cur) > delaygranularity)
{
I_Sleep(sleepvalue);
}
// Otherwise, this is a spinloop.
cur = I_GetPreciseTime();
}
#endif
}
#ifdef NEWSIGNALHANDLER #ifdef NEWSIGNALHANDLER
ATTRNORETURN static FUNCNORETURN void newsignalhandler_Warn(const char *pr) ATTRNORETURN static FUNCNORETURN void newsignalhandler_Warn(const char *pr)
{ {