The concept of threads is to control concurrent use of the same code. If the two processes are intended to execute different code concurrently, you probably want to use fork instead, e.g.: 
my $pid = fork;
if (!$pid) {
    # execute background code
    exit;
}
else {
    # execute concurrent foreground code
    waitpid $pid, 0;
}
# execute non-concurrent foreground code

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In reply to Re: threads->create hangs by anonymized user 468275
in thread threads->create hangs by duane_ellis2

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