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        tie *OFH, "IOQueue", $obuff, $self;
        tie *EFH, "IOQueue", $ebuff, $self;
...
        $$out = $self->{'outh'} = \*OFH;
        $$err = $self->{'errh'} = \*EFH;

        if (! defined $self->{'rc'}) {
                ...
...
        print "Threads joined\n";

                ...