src/DiskIO/AIO/AIODiskIOStrategy.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H
  10 #define SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H
  11
  12 #if HAVE_DISKIO_MODULE_AIO
  13
  14 #include "DiskIO/AIO/async_io.h"
  15 #include "DiskIO/DiskIOStrategy.h"
  16
  17 class AIODiskIOStrategy : public DiskIOStrategy
  18 {
  19
  20 public:
  21     AIODiskIOStrategy();
  22     virtual ~AIODiskIOStrategy();
  23
  24     virtual bool shedLoad();
  25     /* What is the current load? 999 = 99.9% */
  26     virtual int load();
  27     /* Return a handle for performing IO operations */
  28     virtual RefCount<DiskFile> newFile (char const *path);
  29     /* flush all IO operations  */
  30     virtual void sync();
  31     /** whether the IO Strategy can use unlinkd */
  32     virtual bool unlinkdUseful() const;
  33     /* unlink a file by path */
  34     virtual void unlinkFile (char const *);
  35
  36     /* perform any pending callbacks */
  37     virtual int callback();
  38
  39     /* Init per-instance logic */
  40     virtual void init();
  41
  42     /* cachemgr output on the IO instance stats */
  43     virtual void statfs(StoreEntry & sentry)const;
  44     /* module specific options */
  45     virtual ConfigOption *getOptionTree() const;
  46     /* a file descriptor */
  47     int fd;
  48     /* queue of requests */
  49     async_queue_t aq;
  50
  51     int findSlot();
  52 };
  53
  54 #endif /* HAVE_DISKIO_MODULE_AIO */
  55 #endif /* SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H */
  56