IPC::Semaphore - Online Linux Manual PageSection : 3
Updated : 2022-01-21
Source : perl v5.34.0
Note : User Contributed Perl Documentation
NAMEIPC::Semaphore − SysV Semaphore IPC object class
SYNOPSIS use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR IPC_CREAT);
use IPC::Semaphore;
$sem = IPC::Semaphore−>new(IPC_PRIVATE, 10, S_IRUSR | S_IWUSR | IPC_CREAT);
$sem−>setall( (0) x 10);
@sem = $sem−>getall;
$ncnt = $sem−>getncnt;
$zcnt = $sem−>getzcnt;
$ds = $sem−>stat;
$sem−>remove;
DESCRIPTIONA class providing an object based interface to SysV IPC semaphores.
METHODSnew ( KEY , NSEMS , FLAGS ) Create a new semaphore set associated with KEY. NSEMS is the number of semaphores in the set. A new set is created if • KEY is equal to IPC_PRIVATE • KEY does not already have a semaphore identifier associated with it, and FLAGS & IPC_CREAT is true. On creation of a new semaphore set FLAGS is used to set the permissions. Be careful not to set any flags that the Sys V IPC implementation does not allow: in some systems setting execute bits makes the operations fail. getall Returns the values of the semaphore set as an array. getncnt ( SEM ) Returns the number of processes waiting for the semaphore SEM to become greater than its current value getpid ( SEM ) Returns the process id of the last process that performed an operation on the semaphore SEM. getval ( SEM ) Returns the current value of the semaphore SEM. getzcnt ( SEM ) Returns the number of processes waiting for the semaphore SEM to become zero. id Returns the system identifier for the semaphore set. op ( OPLIST ) OPLIST is a list of operations to pass to semop. OPLIST is a concatenation of smaller lists, each which has three values. The first is the semaphore number, the second is the operation and the last is a flags value. See semop (2) for more details. For example $sem−>op(
0, −1, IPC_NOWAIT,
1, 1, IPC_NOWAIT
);
remove Remove and destroy the semaphore set from the system. set ( STAT ) set ( NAME => VALUE [, NAME => VALUE ...] ) set will set the following values of the stat structure associated with the semaphore set. uid
gid
mode (only the permission bits)
set accepts either a stat object, as returned by the stat method, or a list of name−value pairs. setall ( VALUES ) Sets all values in the semaphore set to those given on the VALUES list. VALUES must contain the correct number of values. setval ( N , VALUE ) Set the Nth value in the semaphore set to VALUE stat Returns an object of type IPC::Semaphore::stat which is a sub-class of Class::Struct. It provides the following fields. For a description of these fields see your system documentation. uid
gid
cuid
cgid
mode
ctime
otime
nsems
SEE ALSOIPC::SysV, Class::Struct, semget (2), semctl (2), semop (2)
AUTHORSGraham Barr <gbarr@pobox.com>, Marcus Holland-Moritz <mhx@cpan.org>
COPYRIGHTVersion 2.x, Copyright (C) 2007−2013, Marcus Holland-Moritz. Version 1.x, Copyright (c) 1997, Graham Barr. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. 0
Johanes Gumabo
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