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