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//
// RWLock.h
//
// Library: Foundation
// Package: Threading
// Module: RWLock
//
// Definition of the RWLock class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_RWLock_INCLUDED
#define Foundation_RWLock_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#if defined(POCO_OS_FAMILY_WINDOWS)
#if defined(_WIN32_WCE)
#include "Poco/RWLock_WINCE.h"
#else
#include "Poco/RWLock_WIN32.h"
#endif
#elif POCO_OS == POCO_OS_ANDROID
#include "Poco/RWLock_Android.h"
#elif defined(POCO_VXWORKS)
#include "Poco/RWLock_VX.h"
#else
#include "Poco/RWLock_POSIX.h"
#endif
namespace Poco {
class ScopedRWLock;
class ScopedReadRWLock;
class ScopedWriteRWLock;
class Foundation_API RWLock: private RWLockImpl
/// A reader writer lock allows multiple concurrent
/// readers or one exclusive writer.
{
public:
typedef ScopedRWLock ScopedLock;
typedef ScopedReadRWLock ScopedReadLock;
typedef ScopedWriteRWLock ScopedWriteLock;
RWLock();
/// Creates the Reader/Writer lock.
~RWLock();
/// Destroys the Reader/Writer lock.
void readLock();
/// Acquires a read lock. If another thread currently holds a write lock,
/// waits until the write lock is released.
bool tryReadLock();
/// Tries to acquire a read lock. Immediately returns true if successful, or
/// false if another thread currently holds a write lock.
void writeLock();
/// Acquires a write lock. If one or more other threads currently hold
/// locks, waits until all locks are released. The results are undefined
/// if the same thread already holds a read or write lock
bool tryWriteLock();
/// Tries to acquire a write lock. Immediately returns true if successful,
/// or false if one or more other threads currently hold
/// locks. The result is undefined if the same thread already
/// holds a read or write lock.
void unlock();
/// Releases the read or write lock.
private:
RWLock(const RWLock&);
RWLock& operator = (const RWLock&);
};
class Foundation_API ScopedRWLock
/// A variant of ScopedLock for reader/writer locks.
{
public:
ScopedRWLock(RWLock& rwl, bool write = false);
~ScopedRWLock();
private:
RWLock& _rwl;
ScopedRWLock();
ScopedRWLock(const ScopedRWLock&);
ScopedRWLock& operator = (const ScopedRWLock&);
};
class Foundation_API ScopedReadRWLock : public ScopedRWLock
/// A variant of ScopedLock for reader locks.
{
public:
ScopedReadRWLock(RWLock& rwl);
~ScopedReadRWLock();
};
class Foundation_API ScopedWriteRWLock : public ScopedRWLock
/// A variant of ScopedLock for writer locks.
{
public:
ScopedWriteRWLock(RWLock& rwl);
~ScopedWriteRWLock();
};
//
// inlines
//
inline void RWLock::readLock()
{
readLockImpl();
}
inline bool RWLock::tryReadLock()
{
return tryReadLockImpl();
}
inline void RWLock::writeLock()
{
writeLockImpl();
}
inline bool RWLock::tryWriteLock()
{
return tryWriteLockImpl();
}
inline void RWLock::unlock()
{
unlockImpl();
}
inline ScopedRWLock::ScopedRWLock(RWLock& rwl, bool write): _rwl(rwl)
{
if (write)
_rwl.writeLock();
else
_rwl.readLock();
}
inline ScopedRWLock::~ScopedRWLock()
{
try
{
_rwl.unlock();
}
catch (...)
{
poco_unexpected();
}
}
inline ScopedReadRWLock::ScopedReadRWLock(RWLock& rwl): ScopedRWLock(rwl, false)
{
}
inline ScopedReadRWLock::~ScopedReadRWLock()
{
}
inline ScopedWriteRWLock::ScopedWriteRWLock(RWLock& rwl): ScopedRWLock(rwl, true)
{
}
inline ScopedWriteRWLock::~ScopedWriteRWLock()
{
}
} // namespace Poco
#endif // Foundation_RWLock_INCLUDED
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