accessiblecontexthelper.hxx

Go to the documentation of this file.

/* -*- 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_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
#define INCLUDED_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
 
#include <comphelper/accessiblecomponenthelper.hxx>
#include <comphelper/solarmutex.hxx>
 
 
namespace comphelper
{
 
 
    //= OContextEntryGuard
 
    class OContextEntryGuard : public ::osl::ClearableMutexGuard
    {
    public:
        inline OContextEntryGuard( OCommonAccessibleComponent* _pContext );
    };
 
 
    inline OContextEntryGuard::OContextEntryGuard( OCommonAccessibleComponent* _pContext  )
        : ::osl::ClearableMutexGuard( _pContext->GetMutex() )
    {
        _pContext->ensureAlive();
    }
 
 
    //= OExternalLockGuard
 
    class OExternalLockGuard
            :public osl::Guard<SolarMutex>
            ,public OContextEntryGuard
    {
    public:
        inline OExternalLockGuard( OCommonAccessibleComponent* _pContext );
    };
 
 
    inline OExternalLockGuard::OExternalLockGuard( OCommonAccessibleComponent* _pContext )
        :osl::Guard<SolarMutex>( SolarMutex::get() )
        ,OContextEntryGuard( _pContext )
    {
        // Only lock the external mutex,
        // release the ::osl::Mutex of the OCommonAccessibleComponent instance.
        // If you call into another UNO object with locked ::osl::Mutex,
        // this may lead to dead locks.
        clear();
    }
 
 
}   // namespace comphelper
 
 
#endif // INCLUDED_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
 
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */