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    my $thr = threads->create({'context' => 'list'}, \&foo);
    ...
    my @results = $thr->join();

    my $thr = threads->create({'context' => 'void'}, \&foo);
    ...
    $thr->join();

    threads->create({'scalar' => 1}, \&foo);
    ...
    my ($thr) = threads->list();
    my $result = $thr->join();

    # Create thread in list context
    my ($thr) = threads->create(...);
...

    # Create thread in void context
    threads->create(...);