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Even after fork, we might need the parent sigmask without having access to the real _main_tls. There's a short time at process startup, when _main_tls points to the system-allocated stack, but wait_sig is already running. If we can't lock _main_tls, because find_tls can't find it yet, we now access the parent's sigmask via child_info. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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