Hi.. thanks for your reply. I just found the problem is causing due to one thread. I have no problem if I turn that off. The function proc1 is using Thread::Queue. I tested without proc1 and it doesnt create any problem. Code of proc1 is like the below: 
sub proc1 {
    $q = Thread::Queue->new();
    while($p = $q->dequeue()){
        if($p eq 'exit'){
            last;
        }
        .....
    }
    $q->end();
    threads->exit();
}

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In reply to Re^2: Perl how to join all threads by kamrul
in thread Perl how to join all threads by kamrul

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