From d978c71a145f02173aa57d24489511a45f4d8957 Mon Sep 17 00:00:00 2001
From: amosjeffries <>
Date: Sun, 24 Feb 2008 19:06:41 +0000
Subject: [PATCH] Author: Alexey Veselovsky <alexey.veselovsky@eykontech.com>
 Bug #2101: Reuse pconns using LIFO

Change the reuse order of persistent connections to LIFO to keep hot
connections and let unused connections expire.

This is how Squid-2 has been doing things for a long time.
---
 src/pconn.cc | 6 +++---
 src/pconn.h  | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/pconn.cc b/src/pconn.cc
index d6d3f5f25f..16cd75db85 100644
--- a/src/pconn.cc
+++ b/src/pconn.cc
@@ -1,6 +1,6 @@
 
 /*
- * $Id: pconn.cc,v 1.53 2007/05/29 13:31:40 amosjeffries Exp $
+ * $Id: pconn.cc,v 1.53.4.1 2008/02/24 12:06:41 amosjeffries Exp $
  *
  * DEBUG: section 48    Persistent Connections
  * AUTHOR: Duane Wessels
@@ -139,7 +139,7 @@ IdleConnList::findUseableFD()
 {
     assert(nfds);
 
-    for (int i = 0; i< nfds; i++) {
+    for (int i=nfds-1; i>=0; i--) {
         if (!comm_has_pending_read_callback(fds[i])) {
             return fds[i];
         }
@@ -284,7 +284,7 @@ PconnPool::pop(const char *host, u_short port, const char *domain, struct IN_ADD
     if (list == NULL)
         return -1;
 
-    int fd = list->findUseableFD();
+    int fd = list->findUseableFD(); // search from the end. skip pending reads.
 
     if (fd >= 0)
     {
diff --git a/src/pconn.h b/src/pconn.h
index a2d4df6ec5..8b08f07e82 100644
--- a/src/pconn.h
+++ b/src/pconn.h
@@ -19,10 +19,10 @@ public:
     ~IdleConnList();
     int numIdle() { return nfds; }
 
-    int findFDIndex(int fd);
+    int findFDIndex(int fd); ///< search from the end of array
     void removeFD(int fd);
     void push(int fd);
-    int findUseableFD();
+    int findUseableFD();     ///< find first from the end not pending read fd.
     void clearHandlers(int fd);
 
 private:
-- 
2.47.3