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-.\" $Darwin$
-.\"
-.\" Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
-.\"
-.\" @APPLE_LICENSE_HEADER_START@
-.\"
-.\" The contents of this file constitute Original Code as defined in and
-.\" are subject to the Apple Public Source License Version 1.1 (the
-.\" "License"). You may not use this file except in compliance with the
-.\" License. Please obtain a copy of the License at
-.\" http://www.apple.com/publicsource and read it before using this file.
-.\"
-.\" This Original Code and all software distributed under the License are
-.\" distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
-.\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
-.\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
-.\" FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
-.\" License for the specific language governing rights and limitations
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-.\" @APPLE_LICENSE_HEADER_END@
-.\"
-.Dd June 8, 2000
-.Dt SEM_POST 2
-.Os Darwin
-.Sh NAME
-.Nm sem_post
-.Nd unlock a semaphore
-.Sh SYNOPSIS
-.Fd #include <semaphore.h>
-.Ft int
-.Fn sem_post "sem_t *sem"
-.Sh DESCRIPTION
-The the semaphore referenced by
-.Fa sem
-is unlocked, the value of the semaphore is incremented, and all
-threads which are waiting on the semaphore are awakened.
-.Pp
-.Fn sem_post
-is reentrant with respect to signals and may be called from within a
-signal hanlder.
-.Pp
-If successful,
-.Fn sem_post
-will return 0. Otherwise, -1 is returned and
-.Va errno
-is set.
-.Sh ERRORS
-.Fn sem_post
-succeeds unless:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-.Fa sem
-is not a valid semaphore descriptor.
-.El
-.Sh SEE ALSO
-.Xr semctl 2 ,
-.Xr semget 2 ,
-.Xr semop 2 ,
-.Xr sem_open 2 ,
-.Xr sem_trywait 2 ,
-.Xr sem_wait 2
-.Sh HISTORY
-.Fn sem_post
-is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995).