diff --git a/src/common_define.h b/src/common_define.h
index 4c96473..7dea6ed 100644
--- a/src/common_define.h
+++ b/src/common_define.h
@@ -455,6 +455,14 @@ static inline int fc_string_compare(const string_t *s1, const string_t *s2)
     }
 }
 
+static inline bool fc_string_equal_ex(const char *str1,
+        const int len1, const char *str2, const int len2)
+{
+    return (len1 == len2) && (memcmp(str1, str2, len1) == 0);
+}
+#define fc_string_equals_ex(str1, len1, str2, len2) \
+    fc_string_equal_ex(str1, len1, str2, len2)
+
 static inline bool fc_string_equal(const string_t *s1, const string_t *s2)
 {
     return (s1->len == s2->len) && (memcmp(s1->str, s2->str, s1->len) == 0);
diff --git a/src/connection_pool.c b/src/connection_pool.c
index 26b256f..29ee4d7 100644
--- a/src/connection_pool.c
+++ b/src/connection_pool.c
@@ -25,10 +25,20 @@
 #include "server_id_func.h"
 #include "connection_pool.h"
 
+static void conn_pool_disconnect_server_cb(ConnectionInfo *conn)
+{
+    conn_pool_disconnect_server(conn);
+}
+
+static bool conn_pool_is_connected_cb(ConnectionInfo *conn)
+{
+    return conn_pool_is_connected(conn);
+}
+
 ConnectionCallbacks g_connection_callbacks = {
     false, {{conn_pool_connect_server_ex1,
-        conn_pool_disconnect_server,
-        conn_pool_is_connected},
+        conn_pool_disconnect_server_cb,
+        conn_pool_is_connected_cb},
     {NULL, NULL, NULL}}, {NULL}
 };
 
@@ -411,20 +421,6 @@ void conn_pool_destroy(ConnectionPool *cp)
     fast_mblock_destroy(&cp->node_allocator);
 }
 
-void conn_pool_disconnect_server(ConnectionInfo *conn)
-{
-    if (conn->sock >= 0)
-    {
-        close(conn->sock);
-        conn->sock = -1;
-    }
-}
-
-bool conn_pool_is_connected(ConnectionInfo *conn)
-{
-    return (conn->sock >= 0);
-}
-
 int conn_pool_connect_server_ex1(ConnectionInfo *conn,
         const char *service_name, const int connect_timeout_ms,
         const char *bind_ipaddr, const bool log_connect_error)
diff --git a/src/connection_pool.h b/src/connection_pool.h
index 8f44f20..a667aa7 100644
--- a/src/connection_pool.h
+++ b/src/connection_pool.h
@@ -331,9 +331,19 @@ int conn_pool_close_connection_ex(ConnectionPool *cp,
 *      conn: the connection
 *   return 0 for success, != 0 for error
 */
-void conn_pool_disconnect_server(ConnectionInfo *conn);
+static inline void conn_pool_disconnect_server(ConnectionInfo *conn)
+{
+    if (conn->sock >= 0)
+    {
+        close(conn->sock);
+        conn->sock = -1;
+    }
+}
 
-bool conn_pool_is_connected(ConnectionInfo *conn);
+static inline bool conn_pool_is_connected(ConnectionInfo *conn)
+{
+    return (conn->sock >= 0);
+}
 
 /**
 *   connect to the server