A crontab access locker
https://github.com/McBugFix/upAccessLocker
@author Uli Pahlke <[email protected]>
@link http://www.matrix-tools.de
@version 0.1

Usage
$al = new AccessLocker();
if ($al->setAccessLocker('process1') == false) {
    exit('Process is running already...');
} else {
    // do something...
    $al->freeAccessLocker();
}