From f4dacfda980b54e333db96e008951b4fd6fd7ba5 Mon Sep 17 00:00:00 2001
From: yuqing <yuqing@yongche.com>
Date: Thu, 5 Jun 2014 18:16:20 +0800
Subject: [PATCH] add macro fast_mblock_to_node_ptr

---
 src/fast_mblock.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/fast_mblock.h b/src/fast_mblock.h
index afc786f..496c9c7 100644
--- 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
-- 
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