diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
commit | 3d08cd331c1adcf0d917392f7e527b3f00511748 (patch) | |
tree | 312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/sem_init.3 | |
parent | Adding debian version 6.7-2. (diff) | |
download | manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip |
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/sem_init.3')
-rw-r--r-- | man3/sem_init.3 | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/man3/sem_init.3 b/man3/sem_init.3 deleted file mode 100644 index 0cae896..0000000 --- a/man3/sem_init.3 +++ /dev/null @@ -1,108 +0,0 @@ -'\" 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) |