(PECL sync >= 1.0.0)
SyncSemaphore::__construct — Constructs a new SyncSemaphore object
Constructs a named or unnamed semaphore.
nameThe name of the semaphore if this is a named semaphore object.
注意:
If the name already exists, it must be able to be opened by the current user that the process is running as or an exception will be thrown with a meaningless error message.
initialvalThe initial value of the semaphore. This is the number of locks that may be obtained.
autounlockSpecifies whether or not to automatically unlock the semaphore at the conclusion of the PHP script.
If an object is: A named semaphore with an autounlock of false, the object is
locked, and the PHP script concludes before the object is unlocked, 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.
示例 #1 SyncSemaphore::__construct() example
<?php
$semaphore = new SyncSemaphore("LimitedResource_2clients", 2);
if (!$semaphore->lock(3000))
{
echo "Unable to lock semaphore.";
exit();
}
/* ... */
$semaphore->unlock();
?>