(PECL pthreads >= 2.0.0)
Pool::shutdown — Shutdown all workers
public Pool::shutdown ( ) : void
Shuts down all of the workers in the pool. This will block until all submitted tasks have been executed.
This function has no parameters.
No value is returned.
Example #1 Shutting down a pool
<?php
class Task extends Threaded
{
    public function run()
    {
        usleep(500000);
    }
}
$pool = new Pool(4);
for ($i = 0; $i < 10; ++$i) {
    $pool->submit(new Task());
}
$pool->shutdown(); // blocks until all submitted tasks have finished executing 
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    https://www.php.net/manual/en/pool.shutdown.php