SyncSemaphore::lock

(PECL sync >= 1.0.0)

SyncSemaphore::lockDecreases the count of the semaphore or waits

说明

public SyncSemaphore::lock ( int $wait = -1 ) : bool

Decreases the count of a SyncSemaphore object or waits until the semaphore becomes non-zero.

参数

wait

The number of milliseconds to wait for the semaphore. A value of -1 is infinite.

返回值

成功时返回 true, 或者在失败时返回 false

范例

Example #1 SyncSemaphore::lock() example

<?php
$semaphore 
= new SyncSemaphore("LimitedResource_2clients"2);

if (!
$semaphore->lock(3000))
{
    echo 
"Unable to lock semaphore.";

    exit();
}

/* ... */

$semaphore->unlock();
?>

参见

User Contributed Notes

There are no user contributed notes for this page.