Merge pull request #58 from struct/fix_issue_56

fix issue where we look for chunk size but its zero page

Author: struct

src/iso_alloc.c

@@ -808,9 +808,9 @@ INTERNAL_HIDDEN iso_alloc_zone *is_zone_usable(iso_alloc_zone *zone, size_t size
     /* If the cache for this zone is empty we should
      * refill it to make future allocations faster 
      * for all threads */
-    if(zone->free_bit_slot_cache_usable >= zone->free_bit_slot_cache_index) {
-        fill_free_bit_slot_cache(zone);
-    }
+    //if(zone->free_bit_slot_cache_usable >= zone->free_bit_slot_cache_index) {
+    //    fill_free_bit_slot_cache(zone);
+    //}
 
     bit_slot_t bit_slot = get_next_free_bit_slot(zone);
 
@@ -1731,6 +1731,12 @@ INTERNAL_HIDDEN size_t _iso_chunk_size(void *p) {
         return 0;
     }
 
+#if NO_ZERO_ALLOCATIONS
+    if(p == _zero_alloc_page) {
+        return 0;
+    }
+#endif
+
 #if ALLOC_SANITY
     LOCK_SANITY_CACHE();
     _sane_allocation_t *sane_alloc = _get_sane_alloc(p);