sema_post(3synch)                                  sema_post(3synch)


       NAME
             sema_post - release a lock by incrementing the count value of
             the semaphore

       SYNOPSIS
             cc [options] -Kthread file
             #include <synch.h>
             int sema_post(sema_t *sema);

          Parameters
             sema    pointer to the semaphore to increment

       DESCRIPTION
             sema_post increments the count of the semaphore pointed to by
             sema, and if the new count value is less than or equal to
             zero, makes the next thread waiting at the semaphore runnable.

             If more than one thread is waiting, release from the blocked
             group is scheduling policy-specific for bound threads, and may
             be dependent on scheduling parameters for multiplexed threads.

          sema Parameter
             sema must previously have been initialized, either by
             sema_init or statically (see sema_init).

          Return Values
             sema_post returns zero for success and an error number for
             failure, as described below.

          Errors
             If any of the following conditions is detected, sema_post
             returns the corresponding value:

             EINVAL   Invalid argument specified.

       REFERENCES
             semaphore(3synch), sema_destroy(3synch), sema_init(3synch),
             sema_trywait(3synch), sema_wait(3synch), synch(3synch)










                           Copyright 1994 Novell, Inc.               Page 1