SyncMutex::__construct
(PECL sync >= 1.0.0)
SyncMutex::__construct — Constructs a new SyncMutex object
说明
public SyncMutex::__construct
([ string
$name
] )Constructs a named or unnamed countable mutex.
参数
-
name -
The name of the mutex if this is a named mutex object.
Note:
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.
返回值
The new SyncMutex object. An exception is thrown if the mutex cannot be created or opened.
范例
Example #1 SyncMutex::__construct() named mutex with lock timeout example
<?php
$mutex = new SyncMutex("UniqueName");
if (!$mutex->lock(3000))
{
echo "Unable to lock mutex.";
exit();
}
/* ... */
$mutex->unlock();
?>
Example #2 SyncMutex::__construct() unnamed mutex example
<?php
$mutex = new SyncMutex();
$mutex->lock();
/* ... */
$mutex->unlock();
?>
参见
- SyncMutex::lock() - Waits for an exclusive lock
- SyncMutex::unlock() - Unlocks the mutex