STXXL (GIT-copy)

#ifndef MMAP_HEADER
#define MMAP_HEADER

/***************************************************************************
 *            mmap_file.h
 *
 *  Sat Aug 24 23:54:54 2002
 *  Copyright  2002  Roman Dementiev
 *  dementiev@mpi-sb.mpg.de
 ****************************************************************************/

#include "ufs_file.h"

#ifdef BOOST_MSVC
// mmap call does not exist in Windows
#else

#include <sys/mman.h>

__STXXL_BEGIN_NAMESPACE

  //! \weakgroup fileimpl File implementations
  //! \ingroup iolayer
  //! Implemantations of \c stxxl::file and \c stxxl::request 
  //! for various file access methods
  //! \{

	//! \brief Implementation of memory mapped access file
	class mmap_file:public ufs_file_base
	{
		
	public:
		//! \brief constructs file object
		//! \param filename path of file
		//! \param mode open mode, see \c stxxl::file::open_modes
		//! \param disk disk(file) identifier
		inline mmap_file (const std::string & filename, int mode, int disk = -1):
			ufs_file_base (filename, mode, disk)
		{
		}
		request_ptr aread(
				void *buffer, 
				stxxl::int64 pos, 
				size_t bytes,
				completion_handler on_cmpl);
		request_ptr awrite(
				void *buffer,
				stxxl::int64 pos,
				size_t bytes,
				completion_handler on_cmpl);
	};
	
	//! \brief Implementation of memory mapped access file request
	class mmap_request:public ufs_request_base
	{
		friend class mmap_file;
	  protected:
		inline mmap_request (mmap_file * f,
				void *buf, stxxl::int64 off, size_t b,
				request_type t,
				completion_handler on_cmpl):
				ufs_request_base (f, buf, off, b, t, on_cmpl)
		{
		}
		void serve();
		
	public:
		inline const char *io_type()
		{
			return "mmap";
		};
  private:
    // Following methods are declared but not implemented 
    // intentionnaly to forbid their usage
		mmap_request(const mmap_request &);
    mmap_request & operator=(const mmap_request &);
		mmap_request();
	};

//! \}
  
__STXXL_END_NAMESPACE

#endif

#endif