Dunno! I don't know how to fork a thread.

This is what I meant:

# some code here....

for (0 ..3))
{
    my $thr = threads->create (
                sub {
                   worker();
                    }
                 )->detach();
}

# Master Thread
while (1)
{
    master();
}
[download]

How can master() function monitor the threads that were created?

I am new at threads, sorry for mis-understanding.

In your loop, you assign the return value from threads->create to a variable. What do you then do with that variable?