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122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
//
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// RWLock_POSIX.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/RWLock_POSIX.h#1 $
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//
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// Library: Foundation
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// Package: Threading
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// Module: RWLock
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//
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// Definition of the RWLockImpl class for POSIX Threads.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_RWLock_POSIX_INCLUDED
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#define Foundation_RWLock_POSIX_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Exception.h"
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#include <pthread.h>
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#include <errno.h>
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namespace Poco {
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class Foundation_API RWLockImpl
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{
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protected:
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RWLockImpl();
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~RWLockImpl();
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void readLockImpl();
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bool tryReadLockImpl();
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void writeLockImpl();
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bool tryWriteLockImpl();
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void unlockImpl();
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private:
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pthread_rwlock_t _rwl;
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};
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//
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// inlines
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//
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inline void RWLockImpl::readLockImpl()
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{
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if (pthread_rwlock_rdlock(&_rwl))
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throw SystemException("cannot lock reader/writer lock");
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}
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inline bool RWLockImpl::tryReadLockImpl()
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{
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int rc = pthread_rwlock_tryrdlock(&_rwl);
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if (rc == 0)
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return true;
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else if (rc == EBUSY)
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return false;
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else
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throw SystemException("cannot lock reader/writer lock");
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}
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inline void RWLockImpl::writeLockImpl()
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{
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if (pthread_rwlock_wrlock(&_rwl))
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throw SystemException("cannot lock reader/writer lock");
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}
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inline bool RWLockImpl::tryWriteLockImpl()
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{
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int rc = pthread_rwlock_trywrlock(&_rwl);
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if (rc == 0)
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return true;
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else if (rc == EBUSY)
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return false;
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else
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throw SystemException("cannot lock reader/writer lock");
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}
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inline void RWLockImpl::unlockImpl()
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{
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if (pthread_rwlock_unlock(&_rwl))
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throw SystemException("cannot unlock mutex");
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}
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} // namespace Poco
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#endif // Foundation_RWLock_POSIX_INCLUDED
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