sem_post(3C)							  sem_post(3C)

NAME    [Toc]    [Back]

     sem_post -	release	a posix	named or unnamed semaphore

SYNOPSIS    [Toc]    [Back]

     #include <semaphore.h>

     int sem_post(sem_t	*sem<b>);

DESCRIPTION    [Toc]    [Back]

     sem_post atomically increments the	value of the semaphore located at
     address sem.  If any processes are	blocked	on the semaphore, the highest
     priority process waiting the longest is unblocked and made	runnable.

     The address sem may reside	anywhere in the	calling	processes address
     space, but	the process must have read and write access to sem.

     sem_post will fail	if the following is true:

     [EINVAL]	 The semaphore located at address sem is not a valid posix
		 named or unnamed semaphore.

SEE ALSO    [Toc]    [Back]

     sem_init(3C), sem_destroy(3C), sem_getvalue(3C), sem_post(3C),
     sem_wait(3C), sem_trywait(3C), sem_open(3C), sem_close(3C),
     sem_unlink(3C),

DIAGNOSTICS    [Toc]    [Back]

     Upon successful completion, a value of 0 is returned to the calling
     process. Otherwise, a value of -1 is returned and errno is	set to
     indicate the error.


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