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 00038 #ifndef BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_ 00039 #define BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_ 00040 #include "blocxx/BLOCXX_config.h" 00041 #include "blocxx/Types.hpp" 00042 #include "blocxx/NonRecursiveMutex.hpp" 00043 #include "blocxx/Condition.hpp" 00044 #include "blocxx/NonRecursiveMutexLock.hpp" 00045 #include "blocxx/Timeout.hpp" 00046 #include "blocxx/TimeoutTimer.hpp" 00047 00048 namespace BLOCXX_NAMESPACE 00049 { 00050 // TODO: uninline this class. 00051 class Semaphore 00052 { 00053 public: 00054 Semaphore() 00055 : m_curCount(0) 00056 {} 00057 Semaphore(Int32 initCount) 00058 : m_curCount(initCount) 00059 {} 00060 void wait() 00061 { 00062 NonRecursiveMutexLock l(m_mutex); 00063 while (m_curCount <= 0) 00064 { 00065 m_cond.wait(l); 00066 } 00067 --m_curCount; 00068 } 00069 BLOCXX_DEPRECATED bool timedWait(UInt32 sTimeout, UInt32 usTimeout=0) // in 4.0.0 00070 { 00071 return timedWait(Timeout::relative(sTimeout + static_cast<float>(usTimeout) * 1000000.0)); 00072 } 00073 bool timedWait(const Timeout& timeout) 00074 { 00075 bool ret = true; 00076 NonRecursiveMutexLock l(m_mutex); 00077 TimeoutTimer timer(timeout); 00078 while (m_curCount <= 0 && ret == true) 00079 { 00080 ret = m_cond.timedWait(l, timer.asAbsoluteTimeout()); 00081 } 00082 if (ret == true) 00083 { 00084 --m_curCount; 00085 } 00086 return ret; 00087 } 00088 void signal() 00089 { 00090 NonRecursiveMutexLock l(m_mutex); 00091 ++m_curCount; 00092 m_cond.notifyAll(); 00093 } 00094 Int32 getCount() 00095 { 00096 NonRecursiveMutexLock l(m_mutex); 00097 return m_curCount; 00098 } 00099 private: 00100 Int32 m_curCount; 00101 Condition m_cond; 00102 NonRecursiveMutex m_mutex; 00103 // noncopyable 00104 Semaphore(const Semaphore&); 00105 Semaphore& operator=(const Semaphore&); 00106 }; 00107 00108 } // end namespace BLOCXX_NAMESPACE 00109 00110 #endif