mod_proxy: Make ap_proxy_retry_worker() into an optional function. Allows

mod_lbmethod_bybusyness, mod_lbmethod_byrequests, mod_lbmethod_bytraffic
and mod_lbmethod_heartbeat to be loaded without mod_proxy yet being present,
which happens when modules are loaded in alphabetical order.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1209754 13f79535-47bb-0310-9956-ffa450edef68

modules/proxy/proxy_util.h

@@ -0,0 +1,36 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PROXY_UTIL_H_
+#define PROXY_UTIL_H_
+
+/**
+ * @file  proxy_util.h
+ * @brief Internal interfaces private to mod_proxy.
+ *
+ * @defgroup MOD_PROXY_PRIVATE Private
+ * @ingroup MOD_PROXY
+ * @{
+ */
+
+/**
+ * Register optional functions declared within proxy_util.c.
+ */
+void proxy_util_register_hooks(apr_pool_t *p);
+
+/** @} */
+
+#endif /* PROXY_UTIL_H_ */