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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/sem_post.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sem_post 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sem_post \- unlock a semaphore
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.B #include <semaphore.h>
-.P
-.BI "int sem_post(sem_t *" sem );
-.fi
-.SH DESCRIPTION
-.BR sem_post ()
-increments (unlocks) the semaphore pointed to by
-.IR sem .
-If the semaphore's value consequently becomes greater than zero,
-then another process or thread blocked in a
-.BR sem_wait (3)
-call will be woken up and proceed to lock the semaphore.
-.SH RETURN VALUE
-.BR sem_post ()
-returns 0 on success;
-on error, the value of the semaphore is left unchanged,
-\-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I sem
-is not a valid semaphore.
-.TP
-.B EOVERFLOW
-.\" Added in POSIX.1-2008 TC1 (Austin Interpretation 213)
-The maximum allowable value for a semaphore would be exceeded.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR sem_post ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH NOTES
-.BR sem_post ()
-is async-signal-safe:
-it may be safely called within a signal handler.
-.SH EXAMPLES
-See
-.BR sem_wait (3)
-and
-.BR shm_open (3).
-.SH SEE ALSO
-.BR sem_getvalue (3),
-.BR sem_wait (3),
-.BR sem_overview (7),
-.BR signal\-safety (7)