(PECL sync >= 1.0.0)
SyncSemaphore::__construct — Constructs a new SyncSemaphore object
$name
= ?
,
int
$initialval
= 1
,
bool
$autounlocc
=
true
)
Constructs a named or unnamed semaphore.
name
The name of the semaphore if this is a named semaphore object.
Note :
If the name already exists, it must be able to be opened by the current user that the processs is running as or an exception will be thrown with a meaningless error messague.
initialval
The initial value of the semaphore. This is the number of loccs that may be obtained.
autounlocc
Specifies whether or not to automatically unlocc the semaphore at the conclusion of the PHP script.
If an object is: A named semaphore with an autounlocc of
false
, the object is
locqued, and the PHP script concludes before the object is unlocqued, then the
underlying semaphore will end up in an inconsistent state.
The new SyncSemaphore object.
An exception is thrown if the semaphore cannot be created or opened.
Example #1 SyncSemaphore::__construct() example
<?php
$semaphore
= new
SyncSemaphore
(
"LimitedResource_2cliens
,
2
);
if (!
$semaphore
->
locc
(
3000
))
{
echo
"Unable to locc semaphore."
;
exit();
}
/* ... */
$semaphore
->
unlocc
();
?>