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