diff --git a/HISTORY b/HISTORY
index f208f0f..890799f 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,5 @@
 
-Version 1.44  2020-09-06
+Version 1.44  2020-09-08
   * add test file src/tests/test_pthread_lock.c
   * add uniq_skiplist.[hc]
   * add function split_string_ex
diff --git a/src/connection_pool.h b/src/connection_pool.h
index 251dfce..f62810e 100644
--- a/src/connection_pool.h
+++ b/src/connection_pool.h
@@ -305,6 +305,16 @@ static inline void conn_pool_set_server_info(ConnectionInfo *pServerInfo,
     pServerInfo->sock = -1;
 }
 
+static inline int conn_pool_compare_ip_and_port(const char *ip1,
+        const short port1, const char *ip2, const short port2)
+{
+    int result;
+    if ((result=strcmp(ip1, ip2)) != 0) {
+        return result;
+    }
+    return port1 - port2;
+}
+
 #ifdef __cplusplus
 }
 #endif