libreoffice/framework/inc/threadhelp/readguard.hxx

/*************************************************************************
 *
 *  $RCSfile: readguard.hxx,v $
 *
 *  $Revision: 1.3 $
 *
 *  last change: $Author: as $ $Date: 2001-05-02 13:00:41 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
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 ************************************************************************/

#ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_
#define __FRAMEWORK_THREADHELP_READGUARD_HXX_

//_________________________________________________________________________________________________________________
//  my own includes
//_________________________________________________________________________________________________________________

#ifndef __FRAMEWORK_THREADHELP_INONCOPYABLE_H_
#include <threadhelp/inoncopyable.h>
#endif

#ifndef __FRAMEWORK_THREADHELP_IRWLOCK_H_
#include <threadhelp/irwlock.h>
#endif

//_________________________________________________________________________________________________________________
//  interface includes
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  other includes
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  namespace
//_________________________________________________________________________________________________________________

namespace framework{

//_________________________________________________________________________________________________________________
//  const
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  declarations
//_________________________________________________________________________________________________________________

/*-************************************************************************************************************//**
    @short          implement a guard to set read locks
    @descr          This guard should be used to set a lock for reading object internal member.
                    Nobody can control it but don't use member after successfuly locking for writing!
                    We never need a own mutex to safe our internal member access - because
                    a guard is used as function-local member only. There exist no multithreaded access to it realy ...

    @attention      To prevent us against wrong using, the default ctor, copy ctor and the =operator are maked private!

    @implements     -
    @base           INonCopyAble

    @devstatus      ready to use
*//*-*************************************************************************************************************/
class ReadGuard : private INonCopyAble
{
    //-------------------------------------------------------------------------------------------------------------
    //  public methods
    //-------------------------------------------------------------------------------------------------------------
    public:

          //---------------------------------------------------------------------------------------------------------
           //   ctor/dtor
           //---------------------------------------------------------------------------------------------------------
         ReadGuard ( IRWLock* pLock );
         ReadGuard ( IRWLock& rLock );
        ~ReadGuard (                );

          //---------------------------------------------------------------------------------------------------------
           //   interface
           //---------------------------------------------------------------------------------------------------------
        void     lock     ()      ;
        void     unlock   ()      ;
        sal_Bool isLocked () const;

    //-------------------------------------------------------------------------------------------------------------
    //  private methods
    //-------------------------------------------------------------------------------------------------------------
    private:

        /*-****************************************************************************************************//**
            @short      disable using of these functions!
            @descr      It's not allowed to use this methods. Different problem can occure otherwise.
                        Thats why we disable it by make it private.

            @seealso    other ctor

            @param      -
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        ReadGuard();

    //-------------------------------------------------------------------------------------------------------------
    //  private member
    //-------------------------------------------------------------------------------------------------------------
    private:

        IRWLock*    m_pLock     ;   /// refrence to lock-member of protected object
        sal_Bool    m_bLocked   ;   /// protection against multiple lock calls without unlock!

};      //  class ReadGuard

}       //  namespace framework

#endif  //  #ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_