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This document uses PHP Chinese website manual Release
(PECL sync >= 1.0.0)
SyncSemaphore::lock — Decreases the count of the semaphore or waits
$wait
] )Decreases the count of a SyncSemaphore object or waits until the semaphore becomes non-zero.
wait
The number of milliseconds to wait for the semaphore. A value of -1 is infinite.
A boolean of TRUE if the lock operation was successful, FALSE otherwise.
Example #1 SyncSemaphore::lock() example
<?php
$semaphore = new SyncSemaphore ( "LimitedResource_2clients" , 2 );
if (! $semaphore -> lock ( 3000 ))
{
echo "Unable to lock semaphore." ;
exit();
}
$semaphore -> unlock ();
?>