sem_post man page on CentOS

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SEM_POST(3)		   Linux Programmer's Manual		   SEM_POST(3)

NAME
       sem_post - unlock a semaphore

SYNOPSIS
       #include <semaphore.h>

       int sem_post(sem_t *sem);

DESCRIPTION
       sem_post()  increments  (unlocks)  the semaphore pointed to by sem.  If
       the semaphore's value consequently  becomes  greater  than  zero,  then
       another	process	 or thread blocked in a sem_wait(3) call will be woken
       up and proceed to lock the semaphore.

RETURN VALUE
       sem_post() returns 0 on success; on error, the value of	the  semaphore
       is  left	 unchanged,  -1	 is returned, and errno is set to indicate the
       error.

ERRORS
       EINVAL sem is not a valid semaphore.

CONFORMING TO
       POSIX.1-2001.

NOTES
       sem_post() is async-signal-safe: it may be safely called within a  sig‐
       nal handler.

SEE ALSO
       sem_getvalue(3), sem_wait(3), sem_overview(7)

Linux 2.6.16			  2006-03-25			   SEM_POST(3)
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