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MINOR: time: add now_mono_time() and now_cpu_time()

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These two functions retrieve respectively the monotonic clock time and
the per-thread CPU time when available on the platform, or return zero.
These syscalls may require to link with -lrt on certain libc, which is
enabled in the Makefile with USE_RT=1 (default on Linux systems).
This commit is contained in:
Willy Tarreau 2018-10-17 18:59:53 +02:00
parent 58e90cbb9e
commit 5ceeb15002
1 changed files with 26 additions and 0 deletions
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26
include/common/time.h
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@ -22,7 +22,9 @@
#ifndef _COMMON_TIME_H
#define _COMMON_TIME_H
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <common/config.h>
#include <common/standard.h>
@ -514,6 +516,30 @@ REGPRM3 static inline struct timeval *__tv_ms_add(struct timeval *tv, const stru
tv1; \
})
/* returns the system's monotonic time in nanoseconds if supported, otherwise zero */
static inline uint64_t now_mono_time()
{
#if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
#else
return 0;
#endif
}
/* returns the current thread's cumulated CPU time in nanoseconds if supported, otherwise zero */
static inline uint64_t now_cpu_time()
{
#if defined(_POSIX_TIMERS) && defined(_POSIX_THREAD_CPUTIME)
struct timespec ts;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
#else
return 0;
#endif
}
/* Update the idle time value twice a second, to be called after
* tv_update_date() when called after poll(). It relies on <before_poll> to be
* updated to the system time before calling poll().