And here's the timeout template for UNIX:
<?php
pcntl_signal(SIGALRM, function() {});
pcntl_alarm(3);
try {
 if (!flock($handle, LOCK_EX)) {
 throw new \Exception("Timeout");
 }
} finally {
 pcntl_alarm(0);
 pcntl_signal_dispatch();
 pcntl_signal(SIGALRM, SIG_DFL);
}
?>