src/DiskIO/DiskThreads/DiskThreadsIOStrategy.h

   1
   2 /*
   3  * $Id$
   4  *
   5  * DEBUG: section 79    Squid-side Disk I/O functions.
   6  * AUTHOR: Robert Collins
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  35  */
  36
  37 #ifndef __STORE_DISKTHREADEDIOSTRATEGY_H__
  38 #define __STORE_DISKTHREADEDIOSTRATEGY_H__
  39
  40 #define _AIO_OPEN       0
  41 #define _AIO_READ       1
  42 #define _AIO_WRITE      2
  43 #define _AIO_CLOSE      3
  44 #define _AIO_UNLINK     4
  45 #define _AIO_OPENDIR    5
  46 #define _AIO_STAT       6
  47 #include "DiskIO/DiskIOStrategy.h"
  48
  49 class DiskThreadsIOStrategy : public DiskIOStrategy
  50 {
  51
  52 public:
  53     DiskThreadsIOStrategy();
  54     virtual bool shedLoad();
  55     virtual int load();
  56     virtual RefCount<DiskFile> newFile(char const *path);
  57     virtual void unlinkFile (char const *);
  58     virtual int callback();
  59     virtual void sync();
  60     virtual void init();
  61     void done();
  62     /* Todo: add access limitations */
  63     bool initialised;
  64     static DiskThreadsIOStrategy Instance;
  65     MemAllocator *squidaio_ctrl_pool;
  66
  67 private:
  68     static void aioStats(StoreEntry * sentry);
  69     void registerWithCacheManager(void);
  70 };
  71
  72 #endif