semaphore interfaces: sem_wait (3) and sem_timedwait (3) (since Linux 2.6.22; beforehand, always failed ... earlier: futex (2) FUTEX_WAIT , sem_timedwait (3), sem_wait (3). • Linux…pthread_rwlock_timedrdlock () pthread_rwlock_timedwrlock () sem_timedwait () posix_trace_timedgetnext_event () TMR - _POSIX_TIMERSread() readv() recv() recvfrom() recvmsg() select() sem_timedwait() sem_wait() send() sendmsg() sendto() sigpause() [POSIX.1-2001