blocxx
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00001 /******************************************************************************* 00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved. 00003 * Copyright (C) 2006, 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 * * 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 00014 * Vintela, Inc., 00015 * nor Novell, Inc., 00016 * nor the names of its contributors or employees may be used to 00017 * endorse or promote products derived from this software without 00018 * specific prior written permission. 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00021 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00022 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00023 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00024 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00025 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00026 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00029 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00030 * POSSIBILITY OF SUCH DAMAGE. 00031 *******************************************************************************/ 00032 00033 00039 #ifndef BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_ 00040 #define BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_ 00041 #include "blocxx/BLOCXX_config.h" 00042 #include "blocxx/Mutex.hpp" 00043 #include <cassert> 00044 00045 namespace BLOCXX_NAMESPACE 00046 { 00047 00049 class BLOCXX_COMMON_API MutexLock 00050 { 00051 public: 00052 explicit MutexLock(Mutex& mutex, bool initially_locked=true) 00053 : m_mutex(&mutex), m_locked(false) 00054 { 00055 if (initially_locked) 00056 { 00057 lock(); 00058 } 00059 } 00060 ~MutexLock() 00061 { 00062 try 00063 { 00064 if (m_locked) 00065 { 00066 release(); 00067 } 00068 } 00069 catch (...) 00070 { 00071 // don't let exceptions escape 00072 } 00073 } 00074 void lock() 00075 { 00076 assert(m_locked == false); 00077 m_mutex->acquire(); 00078 m_locked = true; 00079 } 00080 void release() 00081 { 00082 assert(m_locked == true); 00083 m_mutex->release(); 00084 m_locked = false; 00085 } 00086 MutexLock(const MutexLock& arg) 00087 : m_mutex(arg.m_mutex), m_locked(arg.m_locked) 00088 { 00089 arg.m_locked = false; 00090 } 00091 bool isLocked() const 00092 { 00093 return m_locked; 00094 } 00095 private: 00096 Mutex* m_mutex; 00097 mutable bool m_locked; 00098 friend class Condition; 00099 }; 00100 00101 } // end namespace BLOCXX_NAMESPACE 00102 00103 #endif