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use threads;
$| ++;
...
    eval(threads->self->join);#Waiting for Godot
    print "before return\n";#will not show up
}

use threads;
$| ++;
...
    }
    print "child thread stop\n";
}

$| ++;
if (($chld = fork()) == 0) {
...
   waitpid $chld, 0;
   print "parent exit\n";
}

$| ++;
waitpid $$, 0; #wait for Godot
print "exit\n";