request_with_waiters.h

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/***************************************************************************
 * include/stxxl/bits/io/request_with_waiters.h
 *
 * Part of the STXXL. See http://stxxl.sourceforge.net
 *
 * Copyright (C) 2002 Roman Dementiev <[email protected]>
 * Copyright (C) 2008 Andreas Beckmann <[email protected]>
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE_1_0.txt or copy at
 * http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#ifndef STXXL_IO_REQUEST_WITH_WAITERS_HEADER
#define STXXL_IO_REQUEST_WITH_WAITERS_HEADER

#include <set>

#include <stxxl/bits/common/mutex.h>
#include <stxxl/bits/common/onoff_switch.h>
#include <stxxl/bits/io/request_interface.h>
#include <stxxl/bits/namespace.h>


STXXL_BEGIN_NAMESPACE

//! \addtogroup fileimpl
//! \{

//! Request that is aware of threads waiting for it to complete.
class request_with_waiters : virtual public request_interface
{
 mutex waiters_mutex;
 std::set<onoff_switch*> waiters;

protected:
 bool add_waiter(onoff_switch* sw);
 void delete_waiter(onoff_switch* sw);
 void notify_waiters();
 /*
 int nwaiters(); // returns number of waiters
 */
};

//! \}

STXXL_END_NAMESPACE

#endif // !STXXL_IO_REQUEST_WITH_WAITERS_HEADER
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