لطفا منتظر باشید ...
 |  |
8.136. IPC::Semaphore
System V Semaphore IPC object class.
Uses constants defined in IPC::SysV.
| new |
$sem = new IPC::Semaphore(key, nsems, flags)
Creates a new semaphore set associated with
key and containing
nsems semaphores. Uses
flags to set the permissions. Creates the
new set if the following are true:
key is equal to IPC_PRIVATE.
key doesn't already have
an associated semaphore identifier, and FLAGS &
IPC_CREAT is true.
| getall |
$sem->getall
Returns the values of the semaphore set as an array.
| getncnt |
$sem->getncnt(sem)
Returns the number of processes waiting for the semaphore
sem to become greater than its current
value.
| getpid |
$sem->getpid(sem)
Returns the process ID of the last process that operated on semaphore
sem.
| getval |
$sem->getval(sem)
Returns the current value of semaphore sem.
| getzcnt |
$sem->getzcnt(sem)
Returns the number of processes waiting for the semaphore
sem to become 0.
| id |
$sem->id
Returns the system identifier for the semaphore set.
| op |
$sem->op(oplist)
Passes a list of operations to the semop function.
oplist is the list of operations,
consisting of a concatenation of smaller lists. Each of the smaller
lists has three values: the semaphore number, the operation, and a
flag. See the semop function in Chapter 5, "Function Reference" for more information.
| remove |
$sem->remove
Removes and destroys the semaphore set.
| set |
$sem->set(stat $sem->set(name=>value[, name=>value...]) |
stat method or a list of name/value pairs and sets
the following values of the stat structure associated with the
semaphore set:
uid
gid
mode (the permission bits)
| setall |
$sem->setall(values)
Sets the values of all the semaphores in the set to those given by
the values list. The number of values on
the list must match the number of semaphores in the set.
| setval |
$sem->setval(n, value)
Sets the nth value in the semaphore set to
value.
| stat |
$ds = $sem->stat
Returns an object of type IPC::Semaphore::stat
(which is a subclass of Class::Struct) that provides the following
fields:
uid gid cuid cgid
mode ctime otime nsems
|  | |
| 8.135. IPC::Open3 |  | 8.137. IPC::SysV |
Copyright © 2002 O'Reilly & Associates. All rights reserved.
