sema_rel(2)                                           sema_rel(2)



NAME
     sema_rel - releases a semaphore previously acquired

SYNOPSIS
     #include <sys/time.h>
     #include <sys/sema.h>

     int sema_rel(sem)
     semaphore *sem;

DESCRIPTION
     sema_rel releases a semaphore previously acquired by
     sema_acq.  If another process is waiting for the semaphore,
     its execution is resumed so that it can attempt to acquire
     the semaphore.

STATUS MESSAGES AND VALUES
     The sema_rel system call returns 0 on success, 1 if the
     semaphore was already released, or -1 if an error occurred.

     Upon an error, errno may be set to EFAULT to indicate that
     the sem parameter points to an invalid location.

SEE ALSO
     sema_acq(2), semget(2), shmat(2), shmget(2)






























March 1993                                                      1