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 00037 #ifndef BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_ 00038 #define BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_ 00039 #include "blocxx/BLOCXX_config.h" 00040 #include "blocxx/Types.hpp" 00041 #include "blocxx/NonRecursiveMutex.hpp" 00042 #include "blocxx/Condition.hpp" 00043 #include "blocxx/NonRecursiveMutexLock.hpp" 00044 00045 namespace BLOCXX_NAMESPACE 00046 { 00047 // TODO: uninline this class. 00048 class Semaphore 00049 { 00050 public: 00051 Semaphore() 00052 : m_curCount(0) 00053 {} 00054 Semaphore(Int32 initCount) 00055 : m_curCount(initCount) 00056 {} 00057 void wait() 00058 { 00059 NonRecursiveMutexLock l(m_mutex); 00060 while (m_curCount <= 0) 00061 { 00062 m_cond.wait(l); 00063 } 00064 --m_curCount; 00065 } 00066 bool timedWait(UInt32 sTimeout, UInt32 usTimeout=0) 00067 { 00068 bool ret = true; 00069 NonRecursiveMutexLock l(m_mutex); 00070 while (m_curCount <= 0 && ret == true) 00071 { 00072 ret = m_cond.timedWait(l, sTimeout, usTimeout); 00073 } 00074 if (ret == true) 00075 { 00076 --m_curCount; 00077 } 00078 return ret; 00079 } 00080 void signal() 00081 { 00082 NonRecursiveMutexLock l(m_mutex); 00083 ++m_curCount; 00084 m_cond.notifyAll(); 00085 } 00086 Int32 getCount() 00087 { 00088 NonRecursiveMutexLock l(m_mutex); 00089 return m_curCount; 00090 } 00091 private: 00092 Int32 m_curCount; 00093 Condition m_cond; 00094 NonRecursiveMutex m_mutex; 00095 // noncopyable 00096 Semaphore(const Semaphore&); 00097 Semaphore& operator=(const Semaphore&); 00098 }; 00099 00100 } // end namespace BLOCXX_NAMESPACE 00101 00102 #endif