IPC::Semaphore(3pPerl Programmers Reference GuiIPC::Semaphore(3p)
IPC::Semaphore - SysV Semaphore IPC object class
use IPC::SysV qw(IPC_PRIVATE S_IRWXU IPC_CREAT); use IPC::Semaphore; $sem = new IPC::Semaphore(IPC_PRIVATE, 10, S_IRWXU | IPC_CREAT); $sem->setall( (0) x 10); @sem = $sem->getall; $ncnt = $sem->getncnt; $zcnt = $sem->getzcnt; $ds = $sem->stat; $sem->remove;
A class providing an object based interface to SysV IPC semaphores.
new ( 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 identif- ier associated with it, and "FLAGS & IPC_CREAT" is true. On creation of a new semaphore set "FLAGS" is used to set the permissions. getall Returns the values of the semaphore set as an array. getncnt ( SEM ) Returns the number of processes waiting for the sema- phore "SEM" to become greater than its current value getpid ( SEM ) Returns the process id of the last process that per- formed an operation on the semaphore "SEM". getval ( SEM ) perl v5.8.8 2005-02-05 1 IPC::Semaphore(3pPerl Programmers Reference GuiIPC::Semaphore(3p) Returns the current value of the semaphore "SEM". getzcnt ( SEM ) Returns the number of processes waiting for the sema- phore "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 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" struc- ture 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 "N"th 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 fol- lowing fields. For a description of these fields see your system documentation. perl v5.8.8 2005-02-05 2 IPC::Semaphore(3pPerl Programmers Reference GuiIPC::Semaphore(3p) uid gid cuid cgid mode ctime otime nsems
IPC::SysV Class::Struct semget semctl semop
Graham Barr <email@example.com>
Copyright (c) 1997 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2005-02-05 3
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