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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_init.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_init 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sem_init \- initialize an unnamed semaphore
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.B #include <semaphore.h>
-.P
-.BI "int sem_init(sem_t *" sem ", int " pshared ", unsigned int " value );
-.fi
-.SH DESCRIPTION
-.BR sem_init ()
-initializes the unnamed semaphore at the address pointed to by
-.IR sem .
-The
-.I value
-argument specifies the initial value for the semaphore.
-.P
-The
-.I pshared
-argument indicates whether this semaphore is to be shared
-between the threads of a process, or between processes.
-.P
-If
-.I pshared
-has the value 0,
-then the semaphore is shared between the threads of a process,
-and should be located at some address that is visible to all threads
-(e.g., a global variable, or a variable allocated dynamically on
-the heap).
-.P
-If
-.I pshared
-is nonzero, then the semaphore is shared between processes,
-and should be located in a region of shared memory (see
-.BR shm_open (3),
-.BR mmap (2),
-and
-.BR shmget (2)).
-(Since a child created by
-.BR fork (2)
-inherits its parent's memory mappings, it can also access the semaphore.)
-Any process that can access the shared memory region
-can operate on the semaphore using
-.BR sem_post (3),
-.BR sem_wait (3),
-and so on.
-.P
-Initializing a semaphore that has already been initialized
-results in undefined behavior.
-.SH RETURN VALUE
-.BR sem_init ()
-returns 0 on success;
-on error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I value
-exceeds
-.BR SEM_VALUE_MAX .
-.TP
-.B ENOSYS
-.I pshared
-is nonzero,
-but the system does not support process-shared semaphores (see
-.BR sem_overview (7)).
-.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_init ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.P
-Bizarrely, POSIX.1-2001 does not specify the value that should
-be returned by a successful call to
-.BR sem_init ().
-POSIX.1-2008 rectifies this, specifying the zero return on success.
-.SH EXAMPLES
-See
-.BR shm_open (3)
-and
-.BR sem_wait (3).
-.SH SEE ALSO
-.BR sem_destroy (3),
-.BR sem_post (3),
-.BR sem_wait (3),
-.BR sem_overview (7)