sem_post(2) BSD System Calls Manual sem_post(2)
NAME
sem_post -- unlock a semaphore
SYNOPSIS
#include <semaphore.h>
int
sem_post(sem_t *sem);
DESCRIPTION
The semaphore referenced by sem is unlocked, the value of the semaphore
is incremented, and all threads which are waiting on the semaphore are
awakened.
sem_post() is reentrant with respect to signals and may be called from
within a signal hanlder.
If successful, sem_post() will return 0. Otherwise, -1 is returned and
errno is set.
ERRORS
sem_post() succeeds unless:
[EINVAL] sem is not a valid semaphore descriptor.
SEE ALSO
sem_open(2), sem_trywait(2), sem_wait(2), semctl(2), semget(2), semop(2)
HISTORY
sem_post() is specified in the POSIX Realtime Extension
(1003.1b-1993/1003.1i-1995).
Darwin June 8, 2000 Darwin
Mac OS X 10.9.1 - Generated Mon Jan 6 13:32:14 CST 2014