ufs_file.h

/***************************************************************************
 *  include/stxxl/bits/io/ufs_file.h
 *
 *  UNIX file system file base
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2002 Roman Dementiev <[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_UFSFILEBASE_HEADER
#define STXXL_UFSFILEBASE_HEADER

#include <stxxl/bits/io/iobase.h>


__STXXL_BEGIN_NAMESPACE


class ufs_request_base;

class ufs_file_base : public file
{
protected:
    int file_des;          // file descriptor
    int mode_;             // open mode
    ufs_file_base(const std::string & filename, int mode, int disk);

public:
    int get_file_des() const;
    ~ufs_file_base();
    stxxl::int64 size();
    void set_size(stxxl::int64 newsize);
    void lock();
};

class ufs_request_base : public request
{
    friend class ufs_file_base;

protected:
    // states of request
    enum { OP = 0, DONE = 1, READY2DIE = 2 };
    // OP - operating, DONE - request served,
    // READY2DIE - can be destroyed
    /*
       ufs_file_base *file;
       void *buffer;
       stxxl::int64 offset;
       size_t bytes;
       request_type type;
     */

    state _state;
    mutex waiters_mutex;
    std::set<onoff_switch *> waiters;

    ufs_request_base(
        ufs_file_base * f,
        void * buf,
        stxxl::int64 off,
        size_t b,
        request_type t,
        completion_handler on_cmpl);
    bool add_waiter(onoff_switch * sw);
    void delete_waiter(onoff_switch * sw);
    int nwaiters();             // returns number of waiters
    void check_aligning();

public:
    virtual ~ufs_request_base();
    void wait();
    bool poll();
    const char * io_type();
};


__STXXL_END_NAMESPACE

#endif // !STXXL_UFSFILEBASE_HEADER