1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
#ifndef MONOCLOCK_H_
#define MONOCLOCK_H_
#include <sys/time.h>
/* Macro to simplify benchmarks. */
#define timeval_diff(x, y) ((double)((y).tv_sec - (x).tv_sec) + \
(double)((y).tv_usec - (x).tv_usec) * 0.000001)
/**
* monoclock_get(tv):
* Store the current time in ${tv}. If CLOCK_MONOTONIC is available, use
* that clock; if CLOCK_MONOTONIC is unavailable, use CLOCK_REALTIME (if
* available) or gettimeofday(2).
*/
int monoclock_get(struct timeval *);
/**
* monoclock_get_cputime(tv):
* Store in ${tv} the duration the process has been running if
* CLOCK_PROCESS_CPUTIME_ID is available; fall back to monoclock_get()
* otherwise.
*/
int monoclock_get_cputime(struct timeval *);
/**
* monoclock_getres(resd):
* Store an upper limit on timer granularity in ${resd}. If CLOCK_MONOTONIC
* is available, use that clock; if CLOCK_MONOTONIC is unavailable, use
* CLOCK_REALTIME (if available) or gettimeofday(2). For this value to be
* meaningful, we assume that clock_getres(x) succeeds iff clock_gettime(x)
* succeeds.
*/
int monoclock_getres(double *);
#endif /* !MONOCLOCK_H_ */
|
