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pa_usec_t pa_rtclock_age(const struct timeval *tv);
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pa_bool_t pa_rtclock_hrtimer(void);
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/* timer with a resolution better than this are considered high-resolution */
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#define PA_HRTIMER_THRESHOLD_USEC 10
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struct timeval* pa_rtclock_from_wallclock(struct timeval *tv);