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 00031 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 00032 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00033 * POSSIBILITY OF SUCH DAMAGE. 00034 * 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