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+'\" et
+.TH SEM_POST "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.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
+\(em unlock a semaphore
+.SH SYNOPSIS
+.LP
+.nf
+#include <semaphore.h>
+.P
+int sem_post(sem_t *\fIsem\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIsem_post\fR()
+function shall unlock the semaphore referenced by
+.IR sem
+by performing a semaphore unlock operation on that semaphore.
+.P
+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.
+.P
+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\fR().
+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.
+.P
+If the Process Sporadic Server option is supported, and the scheduling
+policy is SCHED_SPORADIC, the semantics are as per SCHED_FIFO above.
+.P
+The
+\fIsem_post\fR()
+function shall be async-signal-safe and may be invoked from a
+signal-catching function.
+.SH "RETURN VALUE"
+If successful, the
+\fIsem_post\fR()
+function shall return zero; otherwise, the function shall return \-1
+and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIsem_post\fR()
+function may fail if:
+.TP
+.BR EINVAL
+The
+.IR sem
+argument does not refer to a valid semaphore.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+See
+.IR "\fIsem_timedwait\fR\^(\|)".
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIsemctl\fR\^(\|)",
+.IR "\fIsemget\fR\^(\|)",
+.IR "\fIsemop\fR\^(\|)",
+.IR "\fIsem_timedwait\fR\^(\|)",
+.IR "\fIsem_trywait\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.12" ", " "Memory Synchronization",
+.IR "\fB<semaphore.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .