protected function tryToStartNewTasks()
{
if ($this->scheduled->isEmpty() || false === ($threadId = array_search(false, $this->threads, true))) {
return;
}
do {
$task = $this->scheduled->dequeue();
$this->dispatchEvent(self::EVENT_TASK_STARTED_PRE, $task, $threadId);
$this->threads[$threadId] = $task;
$this->runningThreads++;
$task->start($threadId);
$this->dispatchEvent(self::EVENT_TASK_STARTED_POST, $task, $threadId);
} while (!$this->scheduled->isEmpty() && false !== ($threadId = array_search(false, $this->threads, true)));
}
