36.2.3 Functions for Waiting According to a Specific Clock

The GNU C Library provides several waiting functions that expect an explicit clockid_t argument. These functions were all adopted by POSIX.1-2024.

Function: int pthread_cond_clockwait (pthread_cond_t *cond, pthread_mutex_t *mutex, clockid_t clockid, const struct timespec *abstime)

Preliminary: | MT-Safe | AS-Unsafe lock | AC-Unsafe lock | See POSIX Safety Concepts.

Behaves like pthread_cond_timedwait except the time abstime is measured against the clock specified by clockid rather than the clock specified or defaulted when pthread_cond_init was called. Currently, clockid must be either CLOCK_MONOTONIC or CLOCK_REALTIME.

Function: int pthread_rwlock_clockrdlock (pthread_rwlock_t *rwlock, clockid_t clockid, const struct timespec *abstime)

Preliminary: | MT-Safe | AS-Unsafe lock | AC-Unsafe lock | See POSIX Safety Concepts.

Behaves like pthread_rwlock_timedrdlock except the time abstime is measured against the clock specified by clockid rather than CLOCK_REALTIME. Currently, clockid must be either CLOCK_MONOTONIC or CLOCK_REALTIME, otherwise EINVAL is returned.

Function: int pthread_rwlock_clockwrlock (pthread_rwlock_t *rwlock, clockid_t clockid, const struct timespec *abstime)

Preliminary: | MT-Safe | AS-Unsafe lock | AC-Unsafe lock | See POSIX Safety Concepts.

Behaves like pthread_rwlock_timedwrlock except the time abstime is measured against the clock specified by clockid rather than CLOCK_REALTIME. Currently, clockid must be either CLOCK_MONOTONIC or CLOCK_REALTIME, otherwise EINVAL is returned.