destruction_guard.h
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00001 /*********************************************************************
00002 *
00003 * Software License Agreement (BSD License)
00004 *
00005 *  Copyright (c) 2009, Willow Garage, Inc.
00006 *  All rights reserved.
00007 *
00008 *  Redistribution and use in source and binary forms, with or without
00009 *  modification, are permitted provided that the following conditions
00010 *  are met:
00011 *
00012 *   * Redistributions of source code must retain the above copyright
00013 *     notice, this list of conditions and the following disclaimer.
00014 *   * Redistributions in binary form must reproduce the above
00015 *     copyright notice, this list of conditions and the following
00016 *     disclaimer in the documentation and/or other materials provided
00017 *     with the distribution.
00018 *   * Neither the name of Willow Garage, Inc. nor the names of its
00019 *     contributors may be used to endorse or promote products derived
00020 *     from this software without specific prior written permission.
00021 *
00022 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00023 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00024 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00025 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
00026 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00027 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00028 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00029 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00030 *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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00035 * Author: Eitan Marder-Eppstein
00036 *********************************************************************/
00037 #ifndef ACTIONLIB_DESTRUCTION_GUARD_
00038 #define ACTIONLIB_DESTRUCTION_GUARD_
00039 
00040 #include <boost/thread/condition.hpp>
00041 #include <boost/thread/mutex.hpp>
00042 
00043 namespace actionlib {
00048   class DestructionGuard {
00049     public:
00053       DestructionGuard() : use_count_(0), destructing_(false){}
00054       void destruct(){
00055         boost::mutex::scoped_lock lock(mutex_);
00056         destructing_ = true;
00057         while(use_count_ > 0){
00058           count_condition_.timed_wait(lock, boost::posix_time::milliseconds(1000.0f)); 
00059         }
00060       }
00061 
00066       bool tryProtect(){
00067         boost::mutex::scoped_lock lock(mutex_);
00068         if(destructing_)
00069           return false;
00070         use_count_++;
00071         return true;
00072       }
00073 
00077       void unprotect(){
00078         boost::mutex::scoped_lock lock(mutex_);
00079         use_count_--;
00080       }
00081 
00086       class ScopedProtector
00087       {
00088         public:
00093           ScopedProtector(DestructionGuard& guard) : guard_(guard), protected_(false){
00094             protected_ = guard_.tryProtect();
00095           }
00096 
00101           bool isProtected(){
00102             return protected_;
00103           }
00104 
00108           ~ScopedProtector(){
00109             if(protected_)
00110               guard_.unprotect();
00111           }
00112 
00113         private:
00114           DestructionGuard& guard_;
00115           bool protected_;
00116       };
00117 
00118 
00119     private:
00120       boost::mutex mutex_;
00121       int use_count_;
00122       bool destructing_;
00123       boost::condition count_condition_;
00124   };
00125 
00126 };
00127 #endif


actionlib
Author(s): Eitan Marder-Eppstein, Vijay Pradeep
autogenerated on Sun Oct 5 2014 22:02:55