(PECL sync >= 1.0.0)
SyncReaderWriter::writelock — Waits for an exclusive write lock
Obtains an exclusive write lock on a SyncReaderWriter object.
wait
The number of milliseconds to wait for a lock. A value of -1 is infinite.
Example #1 SyncReaderWriter::writelock() example
<?php
$readwrite = new SyncReaderWriter("FileCacheLock");
$readwrite->writelock();
/* ... */
$readwrite->writeunlock();
?>