(PECL sync >= 1.0.0)
SyncReaderWriter::writeunlock — Releases a write lock
Releases a write lock on a SyncReaderWriter object.
此函数没有参数。
成功时返回 true， 或者在失败时返回 false。
Example #1 SyncReaderWriter::writeunlock() example
<?php
$readwrite = new SyncReaderWriter("FileCacheLock");
$readwrite->writelock();
/* ... */
$readwrite->writeunlock();
?>