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27 lines
1.3 KiB
C++
27 lines
1.3 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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#ifndef TOKU_DBUFIO_H
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#define TOKU_DBUFIO_H
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#ident "$Id$"
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#ident "Copyright (c) 2010 Tokutek Inc. All rights reserved."
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#include <toku_portability.h>
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#include <toku_pthread.h>
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/* Maintain a set of files for reading, with double buffering for the reads. */
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/* A DBUFIO_FILESET is a set of files. The files are indexed from 0 to N-1, where N is specified when the set is created (and the files are also provided when the set is creaed). */
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/* An implementation would typically use a separate thread or asynchronous I/O to fetch ahead data for each file. The system will typically fill two buffers of size M for each file. One buffer is being read out of using dbuf_read(), and the other buffer is either empty (waiting on the asynchronous I/O to start), being filled in by the asynchronous I/O mechanism, or is waiting for the caller to read data from it. */
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typedef struct dbufio_fileset *DBUFIO_FILESET;
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int create_dbufio_fileset (DBUFIO_FILESET *bfsp, int N, int fds[/*N*/], size_t bufsize);
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int destroy_dbufio_fileset(DBUFIO_FILESET);
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int dbufio_fileset_read (DBUFIO_FILESET bfs, int filenum, void *buf_v, size_t count, size_t *n_read);
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int panic_dbufio_fileset(DBUFIO_FILESET, int error);
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void dbufio_print(DBUFIO_FILESET);
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#endif
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