AIODiskIOStrategy.h

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#ifndef SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H
#define SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H
 
#if HAVE_DISKIO_MODULE_AIO
 
#include "DiskIO/AIO/async_io.h"
#include "DiskIO/DiskIOStrategy.h"
 
class AIODiskIOStrategy : public DiskIOStrategy
{
 
public:
    AIODiskIOStrategy();
    ~AIODiskIOStrategy() override;
 
    bool shedLoad() override;
    /* What is the current load? 999 = 99.9% */
    int load() override;
    /* Return a handle for performing IO operations */
    RefCount<DiskFile> newFile (char const *path) override;
    /* flush all IO operations  */
    void sync() override;
    bool unlinkdUseful() const override;
    /* unlink a file by path */
    void unlinkFile (char const *) override;
 
    /* perform any pending callbacks */
    int callback() override;
 
    /* Init per-instance logic */
    void init() override;
 
    /* cachemgr output on the IO instance stats */
    void statfs(StoreEntry & sentry)const override;
    /* module specific options */
    ConfigOption *getOptionTree() const override;
    /* a file descriptor */
    int fd;
    /* queue of requests */
    async_queue_t aq;
 
    int findSlot();
};
 
#endif /* HAVE_DISKIO_MODULE_AIO */
#endif /* SQUID_SRC_DISKIO_AIO_AIODISKIOSTRATEGY_H */