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use CLOCK_MONOTONIC in the timer if it's available

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Linux sets _POSIX_MONOTONIC_CLOCK to 0 meaning it *might* be available,
so a sysconf check is necessary at runtime with a fallback to the
mandatory CLOCK_REALTIME clock.
This commit is contained in:
Daniel Micay 2014-10-16 17:02:18 -04:00 • committed by Jason Evans
parent f69e2f6fda
commit d6384b09e1
2 changed files with 27 additions and 0 deletions
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10
test/include/test/timer.h
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@ -1,10 +1,20 @@
/* Simple timer, for use in benchmark reporting. */
#include <unistd.h>
#include <sys/time.h>
#define JEMALLOC_CLOCK_GETTIME defined(_POSIX_MONOTONIC_CLOCK) \
&& _POSIX_MONOTONIC_CLOCK >= 0
typedef struct {
#if JEMALLOC_CLOCK_GETTIME
struct timespec tv0;
struct timespec tv1;
int clock_id;
#else
struct timeval tv0;
struct timeval tv1;
#endif
} timedelta_t;
void timer_start(timedelta_t *timer);