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win32: use QueryPerformanceCounter for timing

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clock_gettime is implemented in winpthreads, so it's unavailable when
mpv is compiled with its internal pthreads implementation. This makes
mp_raw_time_us fall back to gettimeofday(), which can cause an assert
failure in mp_add_timeout() when the system clock is changed. Use
QueryPerformanceCounter instead.

The clock_gettime(CLOCK_MONOTONIC) implementation in winpthreads uses
QueryPerformanceCounter anyway, so there shouldn't be any change in
behaviour.
This commit is contained in:
James Ross-Gowan 2015-07-04 19:26:14 +10:00 committed by wm4
parent 029da5abce
commit f544bcf105
1 changed files with 11 additions and 13 deletions
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24
osdep/timer-win2.c
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@ -23,6 +23,8 @@
#include <stdlib.h>
#include "timer.h"
static LARGE_INTEGER perf_freq;
void mp_sleep_us(int64_t us)
{
if (us < 0)
@ -35,24 +37,20 @@ void mp_sleep_us(int64_t us)
Sleep(us / 1000);
}
#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(CLOCK_MONOTONIC)
uint64_t mp_raw_time_us(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
abort();
return ts.tv_sec * 1000000LL + ts.tv_nsec / 1000;
LARGE_INTEGER perf_count;
QueryPerformanceCounter(&perf_count);
// Convert QPC units (1/perf_freq seconds) to microseconds. This will work
// without overflow because the QPC value is guaranteed not to roll-over
// within 100 years, so perf_freq must be less than 2.9*10^9.
return perf_count.QuadPart / perf_freq.QuadPart * 1000000 +
perf_count.QuadPart % perf_freq.QuadPart * 1000000 / perf_freq.QuadPart;
}
#else
uint64_t mp_raw_time_us(void)
{
struct timeval tv;
gettimeofday(&tv,NULL);
return tv.tv_sec * 1000000LL + tv.tv_usec;
}
#endif
void mp_raw_time_init(void)
{
QueryPerformanceFrequency(&perf_freq);
timeBeginPeriod(1); // request 1ms timer resolution
}