-d0_malloc_t *d0_malloc = malloc;
-d0_free_t *d0_free = free;
-d0_createmutex_t *d0_createmutex = dummy_createmutex;
-d0_destroymutex_t *d0_destroymutex = dummy_destroymutex;
-d0_lockmutex_t *d0_lockmutex = dummy_lockmutex;
-d0_unlockmutex_t *d0_unlockmutex = dummy_unlockmutex;
+d0_malloc_t *d0_malloc = NULL;
+d0_free_t *d0_free = NULL;
+d0_createmutex_t *d0_createmutex = NULL;
+d0_destroymutex_t *d0_destroymutex = NULL;
+d0_lockmutex_t *d0_lockmutex = NULL;
+d0_unlockmutex_t *d0_unlockmutex = NULL;