commit 0b7853b4e2ce13790ab35902917a8debe868347f
author Ruslan Ermilov <ru@nginx.com> Wed Dec 07 22:25:37 2016 +0300
committer Ruslan Ermilov <ru@nginx.com> Wed Dec 07 22:25:37 2016 +0300
tree 9280f1c3f494155cc97beec87d9c5c13c3215f94
parent 2d291605acb4697993c1b1b6d57c04321fd6ddfb

Slab: added comment about list heads.

src/core/ngx_slab.c

diff --git a/src/core/ngx_slab.c b/src/core/ngx_slab.c
index b6473ea..4357e8d 100644
--- a/src/core/ngx_slab.c
+++ b/src/core/ngx_slab.c
@@ -113,6 +113,7 @@
     n = ngx_pagesize_shift - pool->min_shift;
 
     for (i = 0; i < n; i++) {
+        /* only "next" is used in list head */
         slots[i].slab = 0;
         slots[i].next = &slots[i];
         slots[i].prev = 0;
@@ -127,8 +128,10 @@
 
     page = pool->pages;
 
-    pool->free.prev = 0;
+    /* only "next" is used in list head */
+    pool->free.slab = 0;
     pool->free.next = page;
+    pool->free.prev = 0;
 
     page->slab = pages;
     page->next = &pool->free;