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
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00028 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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00035 * Author: Eitan Marder-Eppstein
00036 *********************************************************************/
00037 #ifndef ACTIONLIB__DESTRUCTION_GUARD_H_
00038 #define ACTIONLIB__DESTRUCTION_GUARD_H_
00039 
00040 #include <boost/thread/condition.hpp>
00041 #include <boost/thread/mutex.hpp>
00042 
00043 namespace actionlib
00044 {
00049 class DestructionGuard
00050 {
00051 public:
00055   DestructionGuard()
00056   : use_count_(0), destructing_(false) {}
00057   void destruct()
00058   {
00059     boost::mutex::scoped_lock lock(mutex_);
00060     destructing_ = true;
00061     while (use_count_ > 0) {
00062       count_condition_.timed_wait(lock, boost::posix_time::milliseconds(1000));
00063     }
00064   }
00065 
00070   bool tryProtect()
00071   {
00072     boost::mutex::scoped_lock lock(mutex_);
00073     if (destructing_) {
00074       return false;
00075     }
00076     use_count_++;
00077     return true;
00078   }
00079 
00083   void unprotect()
00084   {
00085     boost::mutex::scoped_lock lock(mutex_);
00086     use_count_--;
00087   }
00088 
00093   class ScopedProtector
00094   {
00095 public:
00100     ScopedProtector(DestructionGuard & guard)
00101     : guard_(guard), protected_(false)
00102     {
00103       protected_ = guard_.tryProtect();
00104     }
00105 
00110     bool isProtected()
00111     {
00112       return protected_;
00113     }
00114 
00118     ~ScopedProtector()
00119     {
00120       if (protected_) {
00121         guard_.unprotect();
00122       }
00123     }
00124 
00125 private:
00126     DestructionGuard & guard_;
00127     bool protected_;
00128   };
00129 
00130 private:
00131   boost::mutex mutex_;
00132   int use_count_;
00133   bool destructing_;
00134   boost::condition count_condition_;
00135 };
00136 
00137 }   // namespace actionlib
00138 #endif  // ACTIONLIB__DESTRUCTION_GUARD_H_


actionlib
Author(s): Eitan Marder-Eppstein, Vijay Pradeep, Mikael Arguedas
autogenerated on Sat Feb 16 2019 03:21:28