(PECL sync >= 1.0.0)
SyncMutex::lock — Waits for an exclusive lock
$wait = -1): boolObtains an exclusive lock on a SyncMutex object. If the lock is already acquired, then this increments an internal counter.
waitThe number of milliseconds to wait for the exclusive lock. A value of -1 is infinite.
成功した場合に true を、失敗した場合に false を返します。
例1 SyncMutex::lock() example
<?php
$mutex = new SyncMutex("UniqueName");
if (!$mutex->lock(3000))
{
echo "Unable to lock mutex.";
exit();
}
/* ... */
$mutex->unlock();
?>