use threads;
use strict;
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# I added this to make sure we see all printing on time
$| ++;
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# constants
my $workers = 1; #number of simultaneous workers
workerPool();

sub list_threads {
    my @threads = threads->list;
    print "--threads i know of: -----\n";
    for my $t (@threads) {
        print $t->tid."\n";
    }
    print "--------------------------";
}

# sub which maintains a set number of simultaneous threads
sub workerPool {
    print "Starting workerPool...\n";

    my $count = 0;
    my @running_threads = ();
    while (1) {
        @running_threads = threads->list;
        if (scalar(@running_threads) < $workers) {
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        #I added this, and it only shows ONCE 
        print "creating new threads\n";
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    # add a new worker
            $count++;
            my $thread = threads->new(\&worker, $count);
        }
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        # I commented out this, with this flushing the output all the 
+time, I cannot see anything useful
        #list_threads();
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    }
}

# this sub represents a thread
sub worker {
    my $thread_num = $_[0];
    print "---I am thread $thread_num!\n";
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    #this is simply a lie
    print "+++Thread $thread_num gone!\n";
    #this hangs this worker thread itself
    eval(((threads->self)->join));
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}
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