Hello again. This is driving me nuts, and i'm beginning to think it's a bug with threads. AFAIK the following code is correct and should continue to spawn 1 thread, wait until it's finished, spawn another, so on and so forth for all eternity. However, on my machine it spawns around 1021 or so threads and around there somewhere it begins to create threads that never return :-/ Could people please confirm that this is a problem, or modify the code so as to make it work (& also work with more than one $worker). Many thanks, Zoltan. 
#!/usr/local/bin/perl

use threads;
use strict;

# 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) {
            # add a new worker
            $count++;
            my $thread = threads->new(\&worker, $count);
        }
        list_threads();
    }
}

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

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In reply to Possible bug with threads by znu

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