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Rename the packing_data lock to obd_lock and upgrade it to a recursive mutex to make it suitable for current read_lock usages. Additionally remove the superfluous #ifndef NO_PTHREADS guard around mutex initialization in prepare_packing_data as the mutex functions themselves are already protected. Signed-off-by: Patrick Hogg <phogg@novamoon.net> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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