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Diffstat (limited to 'man7/sem_overview.7')
| -rw-r--r-- | man7/sem_overview.7 | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/man7/sem_overview.7 b/man7/sem_overview.7 index c452a1c..67f2e41 100644 --- a/man7/sem_overview.7 +++ b/man7/sem_overview.7 @@ -2,12 +2,12 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH sem_overview 7 2022-12-04 "Linux man-pages 6.05.01" +.TH sem_overview 7 2023-10-31 "Linux man-pages 6.7" .SH NAME sem_overview \- overview of POSIX semaphores .SH DESCRIPTION POSIX semaphores allow processes and threads to synchronize their actions. -.PP +.P A semaphore is an integer whose value is never allowed to fall below zero. Two operations can be performed on semaphores: increment the semaphore value by one @@ -17,7 +17,7 @@ and decrement the semaphore value by one If the value of a semaphore is currently zero, then a .BR sem_wait (3) operation will block until the value becomes greater than zero. -.PP +.P POSIX semaphores come in two forms: named semaphores and unnamed semaphores. .TP @@ -81,7 +81,7 @@ When the semaphore is no longer required, and before the memory in which it is located is deallocated, the semaphore should be destroyed using .BR sem_destroy (3). -.PP +.P The remainder of this section describes some specific details of the Linux implementation of POSIX semaphores. .SS Versions @@ -111,7 +111,7 @@ with names of the form rather than .B NAME_MAX characters.) -.PP +.P Since Linux 2.6.19, ACLs can be placed on files under this directory, to control object permissions on a per-user and per-group basis. .SH NOTES |