add macro fast_mblock_to_node_ptr

2014-06-05 18:16:20 +08:00 · 2014-06-05 18:16:20 +08:00 · f4dacfda98
parent 80fba80f41
commit f4dacfda98
1 changed files with 4 additions and 0 deletions
--- a/src/fast_mblock.h
+++ b/src/fast_mblock.h
@ -40,6 +40,10 @@ struct fast_mblock_man
 	pthread_mutex_t lock;     //the lock for read / write free node chain
 };

+#define fast_mblock_to_node_ptr(data_ptr) \
+        (struct fast_mblock_node *)(data_ptr - ((size_t)(char *) \
+                    &((struct fast_mblock_node *)0)->data))
+
 #ifdef __cplusplus
 extern "C" {
 #endif