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Use nanosleep for I_SleepDuration on *nix
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2 changed files with 46 additions and 35 deletions
35
src/i_time.c
35
src/i_time.c
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@ -88,38 +88,3 @@ void I_UpdateTime(fixed_t timescale)
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g_time.timefrac = FLOAT_TO_FIXED(fractional);
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}
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}
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void I_SleepDuration(precise_t duration)
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{
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UINT64 precision = I_GetPrecisePrecision();
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INT32 sleepvalue = cv_sleep.value;
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UINT64 delaygranularity;
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precise_t cur;
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precise_t dest;
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{
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double gran = round(((double)(precision / 1000) * sleepvalue * MIN_SLEEP_DURATION_MS));
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delaygranularity = (UINT64)gran;
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}
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cur = I_GetPreciseTime();
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dest = cur + duration;
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// the reason this is not dest > cur is because the precise counter may wrap
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// two's complement arithmetic is our friend here, though!
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// e.g. cur 0xFFFFFFFFFFFFFFFE = -2, dest 0x0000000000000001 = 1
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// 0x0000000000000001 - 0xFFFFFFFFFFFFFFFE = 3
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while ((INT64)(dest - cur) > 0)
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{
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// If our cv_sleep value exceeds the remaining sleep duration, use the
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// hard sleep function.
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if (sleepvalue > 0 && (dest - cur) > delaygranularity)
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{
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I_Sleep(sleepvalue);
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}
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// Otherwise, this is a spinloop.
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cur = I_GetPreciseTime();
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}
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}
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@ -2265,6 +2265,52 @@ void I_Sleep(UINT32 ms)
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SDL_Delay(ms);
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}
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void I_SleepDuration(precise_t duration)
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{
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#if defined(__linux__) || defined(__FreeBSD__)
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UINT64 precision = I_GetPrecisePrecision();
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struct timespec ts = {
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.tv_sec = duration / precision,
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.tv_nsec = duration * 1000000000 / precision % 1000000000,
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};
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int status;
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do status = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &ts);
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while (status == EINTR);
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#else
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UINT64 precision = I_GetPrecisePrecision();
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INT32 sleepvalue = cv_sleep.value;
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UINT64 delaygranularity;
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precise_t cur;
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precise_t dest;
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{
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double gran = round(((double)(precision / 1000) * sleepvalue * MIN_SLEEP_DURATION_MS));
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delaygranularity = (UINT64)gran;
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}
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cur = I_GetPreciseTime();
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dest = cur + duration;
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// the reason this is not dest > cur is because the precise counter may wrap
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// two's complement arithmetic is our friend here, though!
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// e.g. cur 0xFFFFFFFFFFFFFFFE = -2, dest 0x0000000000000001 = 1
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// 0x0000000000000001 - 0xFFFFFFFFFFFFFFFE = 3
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while ((INT64)(dest - cur) > 0)
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{
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// If our cv_sleep value exceeds the remaining sleep duration, use the
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// hard sleep function.
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if (sleepvalue > 0 && (dest - cur) > delaygranularity)
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{
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I_Sleep(sleepvalue);
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}
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// Otherwise, this is a spinloop.
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cur = I_GetPreciseTime();
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}
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#endif
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}
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#ifdef NEWSIGNALHANDLER
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ATTRNORETURN static FUNCNORETURN void newsignalhandler_Warn(const char *pr)
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{
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