[PATCH_v2] use CLOCK_MONOTONIC_COARSE posix timer instead of CLOCK_MONOTONIC in Xorg
Jeremy Huddleston
jeremyhu at apple.com
Thu Aug 26 20:36:00 PDT 2010
On Aug 26, 2010, at 18:20, yakui.zhao at intel.com wrote:
> #ifdef MONOTONIC_CLOCK
> struct timespec tp;
> - if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
> + static clockid_t clockid;
static clockid_t clockid = 0;
> + if (!clockid) {
> +#if defined(__linux__) && defined(CLOCK_MONONOTIC_COARSE)
> + if ((clock_getres(CLOCK_MONOTONIC_COARSE, &tp) == 0) &&
> + (tp.tv_nsec / 1000 <= 1000))
> + clockid = CLOCK_MONOTONIC_COARSE;
> + else
> +#endif
> + clockid = CLOCK_MONOTONIC;
> + }
> + if (clock_gettime(clockid, &tp) == 0)
> return (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000L);
> #endif
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