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changeset 6824:ea12328518dc

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Slab: added comment about list heads.
author Ruslan Ermilov <ru@nginx.com>
date Wed, 07 Dec 2016 22:25:37 +0300
parents 88c8c3d65184
children f6beb55792de
files src/core/ngx_slab.c
diffstat 1 files changed, 4 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/src/core/ngx_slab.c
+++ b/src/core/ngx_slab.c
@@ -113,6 +113,7 @@ ngx_slab_init(ngx_slab_pool_t *pool)
     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 @@ ngx_slab_init(ngx_slab_pool_t *pool)
 
     page = pool->pages;
 
+    /* only "next" is used in list head */
+    pool->free.slab = 0;
+    pool->free.next = page;
     pool->free.prev = 0;
-    pool->free.next = page;
 
     page->slab = pages;
     page->next = &pool->free;