time management module

This commit introduces a time management module.

See doc/time_management.md for details.

common/utils/time_manager/time_client.h

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (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.openairinterface.org/?page_id=698
+ *
+ * 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.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef COMMON_UTIL_TIME_MANAGER_TIME_CLIENT
+#define COMMON_UTIL_TIME_MANAGER_TIME_CLIENT
+
+/* opaque data type */
+typedef void time_client_t;
+
+time_client_t *new_time_client(const char *server_ip,
+                               int server_port,
+                               void (*callback)(void *),
+                               void *callback_data);
+
+void free_time_client(time_client_t *time_client);
+
+
+#endif /* COMMON_UTIL_TIME_MANAGER_TIME_CLIENT */