- CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
- switch (mode)
- {
- /* for applications: */
- case CRYPTO_MEM_CHECK_ON: /* aka MemCheck_start() */
- mh_mode = CRYPTO_MEM_CHECK_ON|CRYPTO_MEM_CHECK_ENABLE;
- disabling_thread = 0;
- break;
- case CRYPTO_MEM_CHECK_OFF: /* aka MemCheck_stop() */
- mh_mode = 0;
- disabling_thread = 0;
- break;
-
- /* switch off temporarily (for library-internal use): */
- case CRYPTO_MEM_CHECK_DISABLE: /* aka MemCheck_off() */
- if (mh_mode & CRYPTO_MEM_CHECK_ON)
- {
- mh_mode&= ~CRYPTO_MEM_CHECK_ENABLE;
- 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();
- }
- }
- break;
- case CRYPTO_MEM_CHECK_ENABLE: /* aka MemCheck_on() */
- if (mh_mode & CRYPTO_MEM_CHECK_ON)
- {
- mh_mode|=CRYPTO_MEM_CHECK_ENABLE;
- if (disabling_thread != 0)
- {
- disabling_thread=0;
- CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
- }
- }
- break;
-
- default:
- break;
- }
- CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
- return(ret);
- }