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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_IRWLOCK_H
#define INCLUDED_FRAMEWORK_INC_THREADHELP_IRWLOCK_H
namespace framework{
/*-************************************************************************************************************
@descr A guard (specialy a write guard) support different internal working states.
His lock can set for reading or writing/reading! Or he was unlocked by user ...
*//*-*************************************************************************************************************/
enum ELockMode
{
E_NOLOCK ,
E_READLOCK ,
E_WRITELOCK
};
/*-************************************************************************************************************
@descr We implement two guards for using an rw-lock. But if you wish to implement
different rw-locks to you will have problems by using with same guard implementation!
Thats why we define this "pure virtual base class" ...
All rw-locks must support this base interface for working and all guard must use this one too!
*//*-*************************************************************************************************************/
class IRWLock
{
// public methods
public:
/*-****************************************************************************************************
@descr These functions must be supported by a derived class!
acquireReadAccess() -try to register thread as reader
releaseReadAccess() -unregister thread as reader
acquireWriteAccess() -try to register thread as writer
releaseWriteAccess() -unregister thread as writer
downgradeWriteAccess() -make writer to reader
*//*-*****************************************************************************************************/
virtual void acquireReadAccess () =0;
virtual void releaseReadAccess () =0;
virtual void acquireWriteAccess () =0;
virtual void releaseWriteAccess () =0;
virtual void downgradeWriteAccess () =0;
protected:
~IRWLock() {}
}; // class IRWLock
} // namespace framework
#endif // INCLUDED_FRAMEWORK_INC_THREADHELP_IRWLOCK_H
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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