|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
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 for more details. For example
|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.
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|
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.
IPC::SysV, Class::Struct, semget, semctl, semop
Graham Barr <email@example.com>, Marcus Holland-Moritz <firstname.lastname@example.org>
Version 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.
|perl v5.22.1||IPC::SEMAPHORE (3)||2015-10-17|