Avoid deadlock.

		if (mh_mode & CRYPTO_MEM_CHECK_ON)

			{

			mh_mode&= ~CRYPTO_MEM_CHECK_ENABLE;

			if (disabling_thread != CRYPTO_thread_id())

				{

			if (disabling_thread != CRYPTO_thread_id()) /* otherwise we already have the MALLOC2 lock */

				{

				/* Long-time lock CRYPTO_LOCK_MALLOC2 must not be claimed while

				 * we're holding CRYPTO_LOCK_MALLOC, or we'll deadlock if

				 * somebody else holds CRYPTO_LOCK_MALLOC2 (and cannot release it

				 * because we block entry to this function).

				 * Give them a chance, first, and then claim the locks in

				 * appropriate order (long-time lock first).

				 */

				CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);

				/* Note that after we have waited for CRYPTO_LOCK_MALLOC2

				 * and CRYPTO_LOCK_MALLOC, we'll still be in the right

				 * "case" and "if" branch because MemCheck_start and

				 * MemCheck_stop may never be used while there are multiple

				 * OpenSSL threads. */

				CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);

				CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);

				disabling_thread=CRYPTO_thread_id();

				}

			}