BSDI specific patches, inspired by Nigel Head and otto@mail.olympus.net. Also (non-BSDI specific): - Change the CHECK_STATUS() macro so it tests for nonzero error codes instead of negative error codes only (this was needed for BSDI, but appears to be correct according to the PTHREADS spec). - use memset() to zero out the allocated lock structure. Again, this was needed for BSDI, but can't hurt elsewhere either.