extern size_t malloc_size(const void *ptr);
/* Returns size of given ptr */
+extern size_t malloc_good_size(size_t size);
+ /* Returns number of bytes greater than or equal to size that can be allocated without padding */
+
/********* Batch methods ************/
extern unsigned malloc_zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, unsigned num_requested);