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!/usr/bin/perl

...
    ## END refill queue block ##
    print "mainloop\n";
}

--> enqueue 28304
--> enqueue 28305
...
7
--> 28310 is ready
...

--> enqueue 28319
--> enqueue 28320
...
--> 28330 is ready
--> enqueue 28340
...

kill 9 => $pid;  # I don't care.

#!/usr/bin/perl

...
    $state{$id} = 'finished';
    return $x;
}