00001 /* 00002 * Copyright (c) 2013 hiDOF, Inc. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * 00008 * * Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * * Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * * Neither the name of the Willow Garage, Inc. nor the names of its 00014 * contributors may be used to endorse or promote products derived from 00015 * this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00018 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00021 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00022 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00023 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00024 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00025 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00026 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00027 * POSSIBILITY OF SUCH DAMAGE. 00028 */ 00029 00030 /* 00031 * Publishing ROS messages is difficult, as the publish function is 00032 * not realtime safe. This class provides the proper locking so that 00033 * you can call publish in realtime and a separate (non-realtime) 00034 * thread will ensure that the message gets published over ROS. 00035 * 00036 * Author: Wim Meeussen 00037 */ 00038 00039 #ifndef REALTIME_TOOLS_REALTIME_CLOCK 00040 #define REALTIME_TOOLS_REALTIME_CLOCK 00041 00042 #include <boost/thread/mutex.hpp> 00043 #include <boost/thread.hpp> 00044 #include <ros/ros.h> 00045 00046 namespace realtime_tools 00047 { 00048 00049 class RealtimeClock 00050 { 00051 public: 00052 RealtimeClock(); 00053 ~RealtimeClock(); 00054 00055 ros::Time getSystemTime(const ros::Time& realtime_time); 00056 void loop(); 00057 00058 00059 private: 00060 void lock(); 00061 00062 unsigned int lock_misses_; 00063 ros::Time system_time_; 00064 ros::Duration clock_offset_; 00065 00066 ros::Time last_realtime_time_; 00067 bool running_, initialized_; 00068 boost::mutex mutex_; 00069 boost::thread thread_; 00070 00071 00072 00073 }; // class 00074 }// namespace 00075 00076 #endif