00001 /******************************************************************************* 00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved. 00003 * Copyright (C) 2005 Novell, Inc. 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 notice, 00009 * this list of conditions and the following disclaimer. 00010 * 00011 * - Redistributions in binary form must reproduce the above copyright notice, 00012 * this list of conditions and the following disclaimer in the documentation 00013 * and/or other materials provided with the distribution. 00014 * 00015 * - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its 00016 * contributors may be used to endorse or promote products derived from this 00017 * software without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc., Novell, Inc., OR THE 00023 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00024 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00025 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00026 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00027 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00028 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00029 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 *******************************************************************************/ 00031 00032 00038 #ifndef BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_ 00039 #define BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_ 00040 #include "blocxx/BLOCXX_config.h" 00041 #include "blocxx/Mutex.hpp" 00042 #include <cassert> 00043 00044 namespace BLOCXX_NAMESPACE 00045 { 00046 00048 class BLOCXX_COMMON_API MutexLock 00049 { 00050 public: 00051 explicit MutexLock(Mutex& mutex, bool initially_locked=true) 00052 : m_mutex(&mutex), m_locked(false) 00053 { 00054 if (initially_locked) 00055 { 00056 lock(); 00057 } 00058 } 00059 ~MutexLock() 00060 { 00061 try 00062 { 00063 if (m_locked) 00064 { 00065 release(); 00066 } 00067 } 00068 catch (...) 00069 { 00070 // don't let exceptions escape 00071 } 00072 } 00073 void lock() 00074 { 00075 assert(m_locked == false); 00076 m_mutex->acquire(); 00077 m_locked = true; 00078 } 00079 void release() 00080 { 00081 assert(m_locked == true); 00082 m_mutex->release(); 00083 m_locked = false; 00084 } 00085 MutexLock(const MutexLock& arg) 00086 : m_mutex(arg.m_mutex), m_locked(arg.m_locked) 00087 { 00088 arg.m_locked = false; 00089 } 00090 bool isLocked() const 00091 { 00092 return m_locked; 00093 } 00094 private: 00095 Mutex* m_mutex; 00096 mutable bool m_locked; 00097 friend class Condition; 00098 }; 00099 00100 } // end namespace BLOCXX_NAMESPACE 00101 00102 #endif