php app1.php app2.php //success

php app1.php app2.php
Fatal error: Uncaught Error: Call to undefined function Workerman\Lib\pcntl_alarm()

php app1.php //success
php app2.php //success

if (self::$_event) {  //3.3.9 is Obj but 3.4.2 is NULL
    return self::$_event->add($time_interval,
    $persistent ? EventInterface::EV_TIMER : EventInterface::EV_TIMER_ONCE, $func, $args);
}

if (empty(self::$_tasks)) {
    pcntl_alarm(1); //3.4.2 run here
}

php app1.php app2.php

php app1.php

php app1.php app2.php