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[thirdparty/squid.git] / src / DiskIO / AIO / AIODiskIOStrategy.h
1 /*
2 * SQUID Web Proxy Cache http://www.squid-cache.org/
3 * ----------------------------------------------------------
4 *
5 * Squid is the result of efforts by numerous individuals from
6 * the Internet community; see the CONTRIBUTORS file for full
7 * details. Many organizations have provided support for Squid's
8 * development; see the SPONSORS file for full details. Squid is
9 * Copyrighted (C) 2001 by the Regents of the University of
10 * California; see the COPYRIGHT file for full details. Squid
11 * incorporates software developed and/or copyrighted by other
12 * sources; see the CREDITS file for full details.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
27 *
28 * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
29 */
30
31 #ifndef SQUID_AIODISKIOSTRATEGY_H
32 #define SQUID_AIODISKIOSTRATEGY_H
33
34 #if USE_DISKIO_AIO
35
36 #include "async_io.h"
37 #include "DiskIO/DiskIOStrategy.h"
38
39 class AIODiskIOStrategy : public DiskIOStrategy
40 {
41
42 public:
43 AIODiskIOStrategy();
44 virtual ~AIODiskIOStrategy();
45
46 virtual bool shedLoad();
47 /* What is the current load? 999 = 99.9% */
48 virtual int load();
49 /* Return a handle for performing IO operations */
50 virtual RefCount<DiskFile> newFile (char const *path);
51 /* flush all IO operations */
52 virtual void sync();
53 /** whether the IO Strategy can use unlinkd */
54 virtual bool unlinkdUseful() const;
55 /* unlink a file by path */
56 virtual void unlinkFile (char const *);
57
58 /* perform any pending callbacks */
59 virtual int callback();
60
61 /* Init per-instance logic */
62 virtual void init();
63
64 /* cachemgr output on the IO instance stats */
65 virtual void statfs(StoreEntry & sentry)const;
66 /* module specific options */
67 virtual ConfigOption *getOptionTree() const;
68 /* a file descriptor */
69 int fd;
70 /* queue of requests */
71 async_queue_t aq;
72
73 int findSlot();
74 };
75
76 #endif /* USE_DISKIO_AIO */
77 #endif /* SQUID_AIODISKIOSTRATEGY_H */