AioSignalScheduler.h

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/*
// $Id: //open/dev/fennel/device/AioSignalScheduler.h#12 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2005-2009 SQLstream, Inc.
// Copyright (C) 2005-2009 LucidEra, Inc.
// Portions Copyright (C) 1999-2009 John V. Sichi
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef Fennel_AioSignalScheduler_Included
#define Fennel_AioSignalScheduler_Included

#ifdef USE_AIO_H

#include "fennel/device/DeviceAccessScheduler.h"
#include "fennel/device/RandomAccessRequest.h"
#include "fennel/synch/SynchObj.h"

#include <aio.h>

#include <signal.h>
#include <vector>

FENNEL_BEGIN_NAMESPACE

class AioSignalHandlerThread;

class FENNEL_DEVICE_EXPORT AioSignalScheduler
    : public DeviceAccessScheduler
{
    friend class AioSignalHandlerThread;

    StrictMutex mutex;
    LocalCondition quitCondition;
    struct sigaction saOld;
    bool quit;
    std::vector<AioSignalHandlerThread *> threads;

// REVIEW: maybe change Thread from a wrapper to a derived class, and use a
// boost::thread_group?

    bool isStarted() const
    {
        return !threads.empty();
    }

public:
    explicit AioSignalScheduler(
        DeviceAccessSchedulerParams const &);

    virtual ~AioSignalScheduler();

// ----------------------------------------------------------------------
// Implementation of DeviceAccessScheduler interface (q.v.)
// ----------------------------------------------------------------------
    virtual bool schedule(RandomAccessRequest &request);
    virtual void stop();
};

FENNEL_END_NAMESPACE

#endif

#endif

// End AioSignalScheduler.h

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