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042be43d29
{{{
svn merge -r 20089:20155 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
.
git-svn-id: file:///svn/toku/tokudb@20156 c7de825b-a66e-492c-adef-691d508d4ae1
31 lines
1.4 KiB
C
31 lines
1.4 KiB
C
/* -*- mode: C; c-basic-offset: 4 -*- */
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#ifndef TOKU_DBUFIO_H
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#define TOKU_DBUFIO_H
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#ident "$Id: queue.c 20104 2010-05-12 17:22:40Z bkuszmaul $"
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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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#if defined(__cplusplus) || defined(__cilkplusplus)
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extern "C" {
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#endif
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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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#if defined(__cplusplus) || defined(__cilkplusplus)
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};
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#endif
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#endif
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