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Merge branch 'bug21035' into maint-0.2.9

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This commit is contained in:
Nick Mathewson 2016-12-23 08:06:11 -05:00
commit 1d91bf57df
1 changed files with 30 additions and 2 deletions
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32
src/common/compat_time.c
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@ -324,10 +324,27 @@ monotime_diff_nsec(const monotime_t *start,
/* end of "__APPLE__" */
#elif defined(HAVE_CLOCK_GETTIME)
#ifdef CLOCK_MONOTONIC_COARSE
/**
* Which clock should we use for coarse-grained monotonic time? By default
* this is CLOCK_MONOTONIC_COARSE, but it might not work -- for example,
* if we're compiled with newer Linux headers and then we try to run on
* an old Linux kernel. In that case, we will fall back to CLOCK_MONOTONIC.
*/
static int clock_monotonic_coarse = CLOCK_MONOTONIC_COARSE;
#endif
static void
monotime_init_internal(void)
{
/* no action needed. */
#ifdef CLOCK_MONOTONIC_COARSE
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) < 0) {
log_info(LD_GENERAL, "CLOCK_MONOTONIC_COARSE isn't working (%s); "
"falling back to CLOCK_MONOTONIC.", strerror(errno));
clock_monotonic_coarse = CLOCK_MONOTONIC;
}
#endif
}
void
@ -355,7 +372,18 @@ monotime_coarse_get(monotime_coarse_t *out)
return;
}
#endif
int r = clock_gettime(CLOCK_MONOTONIC_COARSE, &out->ts_);
int r = clock_gettime(clock_monotonic_coarse, &out->ts_);
if (PREDICT_UNLIKELY(r < 0) &&
errno == EINVAL &&
clock_monotonic_coarse == CLOCK_MONOTONIC_COARSE) {
/* We should have caught this at startup in monotime_init_internal!
*/
log_warn(LD_BUG, "Falling back to non-coarse monotonic time %s initial "
"system start?", monotime_initialized?"after":"without");
clock_monotonic_coarse = CLOCK_MONOTONIC;
r = clock_gettime(clock_monotonic_coarse, &out->ts_);
}
tor_assert(r == 0);
}
#endif