src/DiskIO/DiskThreads/DiskThreadsDiskFile.h

   1 /*
   2  * DEBUG: section 79    Disk IO Routines
   3  * AUTHOR: Robert Collins
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  32  */
  33
  34 #ifndef SQUID_DISKTHREADSDISKFILE_H
  35 #define SQUID_DISKTHREADSDISKFILE_H
  36 #include "cbdata.h"
  37 #include "DiskIO/DiskFile.h"
  38 #include "DiskThreads.h"
  39
  40 class DiskThreadsDiskFile : public DiskFile
  41 {
  42
  43 public:
  44     DiskThreadsDiskFile(char const *path, DiskThreadsIOStrategy *);
  45     ~DiskThreadsDiskFile();
  46     virtual void open(int flags, mode_t mode, RefCount<IORequestor> callback);
  47     virtual void create(int flags, mode_t mode, RefCount<IORequestor> callback);
  48     virtual void read(ReadRequest *);
  49     virtual void write(WriteRequest *);
  50     virtual void close();
  51     virtual bool error() const;
  52     virtual int getFD() const { return fd;}
  53
  54     virtual bool canRead() const;
  55     virtual bool canWrite() const;
  56     virtual bool ioInProgress() const;
  57
  58 private:
  59 #if ASYNC_READ
  60
  61     static AIOCB ReadDone;
  62 #else
  63
  64     static DRCB ReadDone;
  65 #endif
  66 #if ASYNC_WRITE
  67
  68     static AIOCB WriteDone;
  69 #else
  70
  71     static DWCB WriteDone;
  72 #endif
  73
  74     int fd;
  75     bool errorOccured;
  76     char const *path_;
  77     DiskThreadsIOStrategy *IO;
  78     size_t inProgressIOs;
  79     static AIOCB OpenDone;
  80     void openDone(int fd, const char *buf, int aio_return, int aio_errno);
  81     RefCount<IORequestor> ioRequestor;
  82     void doClose();
  83
  84     void readDone(int fd, const char *buf, int len, int errflag, RefCount<ReadRequest> request);
  85     void writeDone(int fd, int errflag, size_t len, RefCount<WriteRequest> request);
  86
  87     CBDATA_CLASS2(DiskThreadsDiskFile);
  88 };
  89
  90 #include "DiskIO/ReadRequest.h"
  91
  92 template <class RT>
  93 class IoResult
  94 {
  95
  96 public:
  97     void * operator new (size_t);
  98     void operator delete (void *);
  99     IoResult(RefCount<DiskThreadsDiskFile> aFile, RefCount<RT> aRequest) : file(aFile), request(aRequest) {}
 100
 101     RefCount<DiskThreadsDiskFile> file;
 102     RefCount<RT> request;
 103
 104 private:
 105     CBDATA_CLASS(IoResult);
 106 };
 107
 108 template <class RT>
 109 IoResult<RT>
 110 IOResult(RefCount<RT> aRequest, RefCount<DiskThreadsDiskFile> aFile) { return IoResult<RT>(aFile, aRequest);}
 111
 112 #endif /* SQUID_DISKTHREADSDISKFILE_H */