Execute Jobs parallel using JobQueue

Hello,

Consider my code below would like to execute the sleep() function in
parallel, using POE JobQueue component:


#=============
use strict;
use POE qw(Component::JobQueue);

# Passive queue waits for enqueue events.
POE::Component::JobQueue->spawn(
	Alias       => 'passive',
	WorkerLimit => 16,
	Worker      => \&spawn_a_worker,
	Passive => {
		Prioritizer => sub { 1 }
	}
);

sub spawn_a_worker {
	my ( $postback, @job_params ) = @_;
	POE::Session->create(
		inline_states => {
			_start => \&start,
			sleep  => \&sleep
		},
		args => [
			$postback,
			@job_params,
		],
	);
}

POE::Session->create(
	inline_states => {
		_start => \&init,
		_stop  => sub { print "END" }
	}
);
POE::Kernel->run();
exit(0);

sub init {
	my $kernel = $_[KERNEL];

	foreach ( 1 .. 10 ) {
		$kernel->post( passive => enqueue => response => $_ );
	}
}

sub start {
	my $kernel = $_[ KERNEL ];
	print "Starting\n";
	$kernel->yield("sleep");    	
}

sub sleep {
	print "Sleeping for 5 seconds\n";
	sleep 5;
}

#==========

It seems that tasks still block each other? If not, I would have all
message executed at the end of 5 seconds.