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timer-linux: fallback to CLOCK_MONOTONIC instead of timespec_get

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CLOCK_MONOTONIC_RAW is linux-specific (macOS later supported it but it
has its own timer code) and not neccessarily available everywhere like
on BSDs. It makes sense to prefer it because mpv does a lot of
measurements at small intervals (e.g. every frame) so theoretically it
should be more accurate. However if the OS doesn't have it, fallback to
CLOCK_MONOTONIC instead which is almost exactly the same and very widely
supported across unix-like systems. This clock is technically optional
according to POSIX, but any half-decent OS supports it anyway (sorry
Solaris users). As a benefit, we now know that the clock from mp_time is
always monotonic.
This commit is contained in:
Dudemanguy 2023-10-27 13:11:30 -05:00
parent bc3e850168
commit 891efca9d7
1 changed files with 4 additions and 3 deletions
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7
osdep/timer-linux.c
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@ -35,11 +35,12 @@ void mp_sleep_ns(int64_t ns)
uint64_t mp_raw_time_ns(void)
{
struct timespec tp = {0};
int ret = -1;
#if defined(CLOCK_MONOTONIC_RAW)
clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
#else
timespec_get(&tp, TIME_UTC);
ret = clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
#endif
if (ret)
clock_gettime(CLOCK_MONOTONIC, &tp);
return MP_TIME_S_TO_NS(tp.tv_sec) + tp.tv_nsec;
}