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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SEM_POST" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" sem_post 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+sem_post \- unlock a semaphore (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <semaphore.h>
+.br
+.sp
+int sem_post(sem_t *\fP\fIsem\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsem_post\fP() function shall unlock the semaphore referenced
+by \fIsem\fP by performing a semaphore unlock operation on
+that semaphore.
+.LP
+If the semaphore value resulting from this operation is positive,
+then no threads were blocked waiting for the semaphore to
+become unlocked; the semaphore value is simply incremented.
+.LP
+If the value of the semaphore resulting from this operation is zero,
+then one of the threads blocked waiting for the semaphore
+shall be allowed to return successfully from its call to \fIsem_wait\fP().
+\ If the Process
+Scheduling option is supported, the thread to be unblocked shall be
+chosen in a manner appropriate to the scheduling policies and
+parameters in effect for the blocked threads. In the case of the schedulers
+SCHED_FIFO and SCHED_RR, the highest priority waiting
+thread shall be unblocked, and if there is more than one highest priority
+thread blocked waiting for the semaphore, then the
+highest priority thread that has been waiting the longest shall be
+unblocked. If the Process Scheduling option is not defined, the
+choice of a thread to unblock is unspecified. 
+.LP
+If
+the Process Sporadic Server option is supported, and the scheduling
+policy is SCHED_SPORADIC, the semantics are as per SCHED_FIFO
+above. 
+.LP
+The \fIsem_post\fP() function shall be reentrant with respect to signals
+and may be invoked from a signal-catching
+function.
+.SH RETURN VALUE
+.LP
+If successful, the \fIsem_post\fP() function shall return zero; otherwise,
+the function shall return -1 and set \fIerrno\fP to
+indicate the error.
+.SH ERRORS
+.LP
+The \fIsem_post\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The \fIsem\fP argument does not refer to a valid semaphore.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIsem_post\fP() function is part of the Semaphores option and
+need not be available on all implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIsemctl\fP(), \fIsemget\fP(), \fIsemop\fP(),
+\fIsem_timedwait\fP(), \fIsem_trywait\fP(), \fIsem_wait\fP(),
+the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<semaphore.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .