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//
// RWLock_POSIX.h
//
// Library: Foundation
// Package: Threading
// Module: RWLock
//
// Definition of the RWLockImpl class for POSIX Threads.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_RWLock_POSIX_INCLUDED
#define Foundation_RWLock_POSIX_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include <pthread.h>
#include <errno.h>
namespace Poco {
class Foundation_API RWLockImpl
{
protected:
RWLockImpl();
~RWLockImpl();
void readLockImpl();
bool tryReadLockImpl();
void writeLockImpl();
bool tryWriteLockImpl();
void unlockImpl();
private:
pthread_rwlock_t _rwl;
};
//
// inlines
//
inline void RWLockImpl::readLockImpl()
{
if (pthread_rwlock_rdlock(&_rwl))
throw SystemException("cannot lock reader/writer lock");
}
inline bool RWLockImpl::tryReadLockImpl()
{
int rc = pthread_rwlock_tryrdlock(&_rwl);
if (rc == 0)
return true;
else if (rc == EBUSY)
return false;
else
throw SystemException("cannot lock reader/writer lock");
}
inline void RWLockImpl::writeLockImpl()
{
if (pthread_rwlock_wrlock(&_rwl))
throw SystemException("cannot lock reader/writer lock");
}
inline bool RWLockImpl::tryWriteLockImpl()
{
int rc = pthread_rwlock_trywrlock(&_rwl);
if (rc == 0)
return true;
else if (rc == EBUSY)
return false;
else
throw SystemException("cannot lock reader/writer lock");
}
inline void RWLockImpl::unlockImpl()
{
if (pthread_rwlock_unlock(&_rwl))
throw SystemException("cannot unlock mutex");
}
} // namespace Poco
#endif // Foundation_RWLock_POSIX_INCLUDED
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