static void unixCheckClockType()
{
#if (_POSIX_MONOTONIC_CLOCK-0 == 0)
if (is_likely(load_acquire(monotonicClockChecked)))
return;
# if defined(_SC_MONOTONIC_CLOCK)
// detect if the system support monotonic timers
long x = sysconf(_SC_MONOTONIC_CLOCK);
store_release(monotonicClockAvailable, x >= 200112L);
# endif
store_release(monotonicClockChecked, true);
#endif
}
static inline void do_gettime(qint64 *sec, qint64 *frac)
{
#if (_POSIX_MONOTONIC_CLOCK-0 >= 0)
unixCheckClockType();
if (is_likely(monotonicClockAvailable)) {
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
*sec = ts.tv_sec;
*frac = ts.tv_nsec;
return;
}
#endif
*sec = 0;
*frac = 0;
}