blocxx

RWLocker.cpp

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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 #include "blocxx/BLOCXX_config.h"
00039 #include "blocxx/RWLocker.hpp"
00040 #include "blocxx/ThreadImpl.hpp"
00041 
00042 namespace BLOCXX_NAMESPACE
00043 {
00044 
00045 BLOCXX_DEFINE_EXCEPTION_WITH_ID(RWLocker);
00046 
00047 inline bool RWLocker::ThreadComparer::operator()(Thread_t x, Thread_t y) const
00048 {
00049 #ifdef BLOCXX_NCR
00050    return !ThreadImpl::sameThreads(x, y) && (cma_thread_get_unique(&x) < cma_thread_get_unique(&y));
00051 #else
00052    return !ThreadImpl::sameThreads(x, y) && x < y;
00053 #endif
00054 }
00055 
00057 RWLocker::RWLocker()
00058 {
00059 }
00061 RWLocker::~RWLocker()
00062 {
00063 }
00065 void
00066 RWLocker::getReadLock(UInt32 sTimeout, UInt32 usTimeout)
00067 {
00068    getReadLock(Timeout::relative(sTimeout + static_cast<float>(usTimeout) * 1000000.0));
00069 }
00070 
00072 void
00073 RWLocker::getReadLock(const Timeout& timeout)
00074 {
00075    Thread_t tid = ThreadImpl::currentThread();
00076    m_impl.acquireReadLock(tid, timeout);
00077 }
00078 
00080 void
00081 RWLocker::releaseReadLock()
00082 {
00083    Thread_t tid = ThreadImpl::currentThread();
00084    try
00085    {
00086       m_impl.releaseReadLock(tid);
00087    }
00088    catch (GenericRWLockImplException& e)
00089    {
00090       BLOCXX_THROW_SUBEX(RWLockerException, "Cannot release a read lock when no read lock is held", e);
00091    }
00092 }
00093 
00095 void
00096 RWLocker::getWriteLock(UInt32 sTimeout, UInt32 usTimeout)
00097 {
00098    getWriteLock(Timeout::relative(sTimeout + static_cast<float>(usTimeout) * 1000000.0));
00099 }
00101 void
00102 RWLocker::getWriteLock(const Timeout& timeout)
00103 {
00104    Thread_t tid = ThreadImpl::currentThread();
00105    m_impl.acquireWriteLock(tid, timeout);
00106 }
00107 
00109 void
00110 RWLocker::releaseWriteLock()
00111 {
00112    Thread_t tid = ThreadImpl::currentThread();
00113    try
00114    {
00115       m_impl.releaseWriteLock(tid);
00116    }
00117    catch (GenericRWLockImplException& e)
00118    {
00119       BLOCXX_THROW_SUBEX(RWLockerException, "Cannot release a write lock when no write lock is held", e);
00120    }
00121 }
00122 
00123 } // end namespace BLOCXX_NAMESPACE
00124