src/DiskIO/DiskThreads/DiskThreadsDiskFile.h

   1
   2 /*
   3  * $Id: DiskThreadsDiskFile.h,v 1.2 2006/08/21 00:50:45 robertc Exp $
   4  *
   5  * DEBUG: section 79    Disk IO Routines
   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 SQUID_DISKTHREADSDISKFILE_H
  38 #define SQUID_DISKTHREADSDISKFILE_H
  39 #include "cbdata.h"
  40 #include "DiskIO/DiskFile.h"
  41 #include "DiskThreads.h"
  42
  43 class DiskThreadsDiskFile : public DiskFile
  44 {
  45
  46 public:
  47     void * operator new (size_t);
  48     void operator delete (void *);
  49     DiskThreadsDiskFile (char const *path, DiskThreadsIOStrategy *);
  50     ~DiskThreadsDiskFile();
  51     virtual void open (int, mode_t, RefCount<IORequestor>);
  52     virtual void create (int, mode_t, RefCount<IORequestor>);
  53     virtual void read(ReadRequest *);
  54     virtual void write(WriteRequest *);
  55     virtual void close ();
  56     virtual bool error() const;
  57     virtual int getFD() const { return fd;}
  58
  59     virtual bool canRead() const;
  60     virtual bool canWrite() const;
  61     virtual bool ioInProgress()const;
  62
  63 private:
  64 #if ASYNC_READ
  65
  66     static AIOCB ReadDone;
  67 #else
  68
  69     static DRCB ReadDone;
  70 #endif
  71 #if ASYNC_WRITE
  72
  73     static AIOCB WriteDone;
  74 #else
  75
  76     static DWCB WriteDone;
  77 #endif
  78
  79     int fd;
  80     bool errorOccured;
  81     char const *path_;
  82     DiskThreadsIOStrategy *IO;
  83     size_t inProgressIOs;
  84     static AIOCB OpenDone;
  85     void openDone(int fd, const char *buf, int aio_return, int aio_errno);
  86     RefCount<IORequestor> ioRequestor;
  87     CBDATA_CLASS(DiskThreadsDiskFile);
  88     void doClose();
  89
  90     void readDone(int fd, const char *buf, int len, int errflag, RefCount<ReadRequest>);
  91     void writeDone (int fd, int errflag, size_t len, RefCount<WriteRequest>);
  92 };
  93
  94 #include "DiskIO/ReadRequest.h"
  95
  96 template <class RT>
  97
  98 class IoResult
  99 {
 100
 101 public:
 102     void * operator new (size_t);
 103     void operator delete (void *);
 104     IoResult(RefCount<DiskThreadsDiskFile> aFile, RefCount<RT> aRequest) : file(aFile), request(aRequest){}
 105
 106     RefCount<DiskThreadsDiskFile> file;
 107     RefCount<RT> request;
 108
 109 private:
 110     CBDATA_CLASS(IoResult);
 111 };
 112
 113 template <class RT>
 114 IoResult<RT>
 115 IOResult(RefCount<RT> aRequest, RefCount<DiskThreadsDiskFile> aFile) { return IoResult<RT>(aFile, aRequest);}
 116
 117 #endif /* SQUID_DISKTHREADSDISKFILE_H */