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changeset 1419:79f033a89dd4

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add guard code to prevent endless loop
author Igor Sysoev <igor@sysoev.ru>
date Fri, 24 Aug 2007 15:58:13 +0000
parents acb1f441e7b2
children 24778e7450af
files src/http/ngx_http_upstream_round_robin.c
diffstat 1 files changed, 21 insertions(+), 6 deletions(-) [+]
line wrap: on
line diff
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -303,6 +303,8 @@ ngx_http_upstream_get_round_robin_peer(n
 
             /* it's a first try - get a current peer */
 
+            i = pc->tries;
+
             for ( ;; ) {
                 rrp->current = ngx_http_upstream_get_peer(rrp->peers);
 
@@ -339,16 +341,24 @@ ngx_http_upstream_get_round_robin_peer(n
                     pc->tries--;
                 }
 
-                if (pc->tries) {
-                    continue;
+                if (pc->tries == 0) {
+                    goto failed;
                 }
 
-                goto failed;
+                if (--i == 0) {
+                    ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
+                                  "round robin upstream stuck on %ui tries",
+                                  pc->tries);
+                    goto failed;
+                }
             }
 
             peer->current_weight--;
 
         } else {
+
+            i = pc->tries;
+
             for ( ;; ) {
                 n = rrp->current / (8 * sizeof(uintptr_t));
                 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
@@ -385,11 +395,16 @@ ngx_http_upstream_get_round_robin_peer(n
                     rrp->current = 0;
                 }
 
-                if (pc->tries) {
-                    continue;
+                if (pc->tries == 0) {
+                    goto failed;
                 }
 
-                goto failed;
+                if (--i == 0) {
+                    ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
+                                  "round robin upstream stuck on %ui tries",
+                                  pc->tries);
+                    goto failed;
+                }
             }
 
             peer->current_weight--;