(PECL pthreads >= 0.36)
Stackable::isWaiting — State Detection
Tell if the referenced Stackable is waiting for notification
This function has no parameters.
A boolean indication of state
Example #1 Detect the state of the referenced Stackable
<?php
class Work extends Stackable {
    public function run() {
        $this->synchronized(function($object){
            $object->wait();
        }, $this);
    }
}
class My extends Worker {
    public function run() {
        /** ... **/
    }
}
$my = new My();
$work = new Work();
$my->stack($work);
$my->start();
usleep(10000);
$work->synchronized(function($object){
    var_dump($object->isWaiting());
    $object->notify();
}, $work);
?>
The above example will output:
bool(true)