boostfd_file.h

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/***************************************************************************
 * include/stxxl/bits/io/boostfd_file.h
 *
 * File implementation based on boost::iostreams::file_decriptor
 *
 * Part of the STXXL. See http://stxxl.sourceforge.net
 *
 * Copyright (C) 2006 Roman Dementiev <[email protected]>
 * Copyright (C) 2008 Andreas Beckmann <[email protected]>
 * Copyright (C) 2009 Johannes Singler <[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_BOOSTFD_FILE_HEADER
#define STXXL_IO_BOOSTFD_FILE_HEADER

#include <stxxl/bits/config.h>

#ifndef STXXL_HAVE_BOOSTFD_FILE
#if STXXL_BOOST_CONFIG // if boost is available
 #define STXXL_HAVE_BOOSTFD_FILE 1
#else
 #define STXXL_HAVE_BOOSTFD_FILE 0
#endif
#endif

#if STXXL_HAVE_BOOSTFD_FILE

#include <stxxl/bits/io/disk_queued_file.h>
#include <stxxl/bits/io/request.h>

#include <boost/iostreams/device/file_descriptor.hpp>


STXXL_BEGIN_NAMESPACE

//! \addtogroup fileimpl
//! \{

//! Implementation based on boost::iostreams::file_decriptor.
class boostfd_file : public disk_queued_file
{
 typedef boost::iostreams::file_descriptor fd_type;

protected:
 mutex fd_mutex; // sequentialize function calls involving file_des
 fd_type file_des;
 int mode_;
 offset_type _size();

public:
 boostfd_file(const std::string& filename, int mode, int queue_id = DEFAULT_QUEUE, int allocator_id = NO_ALLOCATOR);
 ~boostfd_file();
 offset_type size();
 void set_size(offset_type newsize);
 void lock();
 void serve(const request* req) throw (io_error);
 const char * io_type() const;
};

//! \}

STXXL_END_NAMESPACE

#endif // #if STXXL_HAVE_BOOSTFD_FILE

#endif // !STXXL_IO_BOOSTFD_FILE_HEADER