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 | man pages section 3: Basic Library Functions Oracle Solaris 11 Information Library |
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| man pages section 3: Basic Library Functions Oracle Solaris 11 Information Library |
enable_extended_FILE_stdio(3C)
posix_spawnattr_getschedparam(3C)
posix_spawnattr_getschedpolicy(3C)
posix_spawnattr_getsigdefault(3C)
posix_spawnattr_getsigignore_np(3C)
posix_spawnattr_getsigmask(3C)
posix_spawnattr_setschedparam(3C)
posix_spawnattr_setschedpolicy(3C)
posix_spawnattr_setsigdefault(3C)
posix_spawnattr_setsigignore_np(3C)
posix_spawnattr_setsigmask(3C)
posix_spawn_file_actions_addclose(3C)
posix_spawn_file_actions_addclosefrom_np(3C)
posix_spawn_file_actions_adddup2(3C)
posix_spawn_file_actions_addopen(3C)
posix_spawn_file_actions_destroy(3C)
posix_spawn_file_actions_init(3C)
pthread_attr_getdetachstate(3C)
pthread_attr_getinheritsched(3C)
pthread_attr_getschedparam(3C)
pthread_attr_getschedpolicy(3C)
pthread_attr_setdetachstate(3C)
pthread_attr_setinheritsched(3C)
pthread_attr_setschedparam(3C)
pthread_attr_setschedpolicy(3C)
pthread_barrierattr_destroy(3C)
pthread_barrierattr_getpshared(3C)
pthread_barrierattr_setpshared(3C)
pthread_condattr_getpshared(3C)
pthread_condattr_setpshared(3C)
pthread_cond_reltimedwait_np(3C)
pthread_key_create_once_np(3C)
pthread_mutexattr_getprioceiling(3C)
pthread_mutexattr_getprotocol(3C)
pthread_mutexattr_getpshared(3C)
pthread_mutexattr_getrobust(3C)
pthread_mutexattr_setprioceiling(3C)
pthread_mutexattr_setprotocol(3C)
pthread_mutexattr_setpshared(3C)
pthread_mutexattr_setrobust(3C)
pthread_mutex_getprioceiling(3C)
pthread_mutex_reltimedlock_np(3C)
pthread_mutex_setprioceiling(3C)
pthread_rwlockattr_destroy(3C)
pthread_rwlockattr_getpshared(3C)
pthread_rwlockattr_setpshared(3C)
pthread_rwlock_reltimedrdlock_np(3C)
pthread_rwlock_reltimedwrlock_np(3C)
pthread_rwlock_timedrdlock(3C)
pthread_rwlock_timedwrlock(3C)
rctlblk_get_enforced_value(3C)
- get high resolution time
#include <sys/time.h>hrtime_tgethrtime(void);
hrtime_tgethrvtime(void);
Thegethrtime() function returns the current high-resolution real time. Time is expressedas nanoseconds since some arbitrary time in the past; it is notcorrelated in any way to the time of day, and thus isnot subject to resetting or drifting by way ofadjtime(2) orsettimeofday(3C). Thehi-res timer is ideally suited to performance measurement tasks, where cheap, accurateinterval timing is required.
Thegethrvtime() function returns the current high-resolution LWP virtual time, expressed astotal nanoseconds of execution time.
Thegethrtime() andgethrvtime() functions both return anhrtime_t, which is a64-bit (long long) signed integer.
The following code fragment measures the average cost ofgetpid(2):
hrtime_t start, end;int i, iters = 100;start = gethrtime();for (i = 0; i < iters; i++) getpid();end = gethrtime();printf("Avg getpid() time = %lld nsec\n", (end - start) / iters);Seeattributes(5) for descriptions of the following attributes:
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proc(1),adjtime(2),gettimeofday(3C),settimeofday(3C),attributes(5)
Although the units of hi-res time are always the same (nanoseconds), theactual resolution is hardware dependent. Hi-res time is guaranteed to bemonotonic (it won't go backward, it won't periodically wrap) and linear (itwon't occasionally speed up or slow down for adjustment, like the time ofday can), but not necessarily unique: two sufficiently proximate calls may returnthe same value.
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