151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1999, 2000
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* Sleepycat Software. All rights reserved.
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*
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* $Id: qam.h,v 11.26 2001/01/11 18:19:52 bostic Exp $
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*/
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/*
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* QAM data elements: a status field and the data.
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*/
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typedef struct _qamdata {
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u_int8_t flags; /* 00: delete bit. */
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#define QAM_VALID 0x01
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#define QAM_SET 0x02
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u_int8_t data[1]; /* Record. */
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} QAMDATA;
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struct __queue; typedef struct __queue QUEUE;
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struct __qcursor; typedef struct __qcursor QUEUE_CURSOR;
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struct __qcursor {
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/* struct __dbc_internal */
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__DBC_INTERNAL
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/* Queue private part */
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/* Per-thread information: queue private. */
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db_recno_t recno; /* Current record number. */
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u_int32_t flags;
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};
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/*
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* The in-memory, per-tree queue data structure.
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*/
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typedef struct __mpfarray {
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u_int32_t n_extent; /* Number of extents in table. */
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u_int32_t low_extent; /* First extent open. */
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u_int32_t hi_extent; /* Last extent open. */
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struct __qmpf {
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int pinref;
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DB_MPOOLFILE *mpf;
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} *mpfarray; /* Array of open extents. */
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} MPFARRAY;
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struct __queue {
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db_pgno_t q_meta; /* Database meta-data page. */
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db_pgno_t q_root; /* Database root page. */
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int re_pad; /* Fixed-length padding byte. */
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u_int32_t re_len; /* Length for fixed-length records. */
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u_int32_t rec_page; /* records per page */
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u_int32_t page_ext; /* Pages per extent */
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MPFARRAY array1, array2; /* File arrays. */
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DB_MPOOL_FINFO finfo; /* Initialized info struct. */
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DB_PGINFO pginfo; /* Initialized pginfo struct. */
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DBT pgcookie; /* Initialized pgcookie. */
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char *path; /* Space allocated to file pathname. */
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char *name; /* The name of the file. */
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char *dir; /* The dir of the file. */
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int mode; /* Mode to open extents. */
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};
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/* Format for queue extent names. */
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#define QUEUE_EXTENT "%s/__dbq.%s.%d"
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typedef struct __qam_filelist {
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DB_MPOOLFILE *mpf;
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u_int32_t id;
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} QUEUE_FILELIST;
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/*
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* Caculate the page number of a recno
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*
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* Number of records per page =
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* Divide the available space on the page by the record len + header.
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*
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* Page number for record =
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* divide the physical record number by the records per page
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* add the root page number
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* For now the root page will always be 1, but we might want to change
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* in the future (e.g. multiple fixed len queues per file).
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*
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* Index of record on page =
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* physical record number, less the logical pno times records/page
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*/
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#define CALC_QAM_RECNO_PER_PAGE(dbp) \
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(((dbp)->pgsize - sizeof(QPAGE)) / \
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ALIGN(((QUEUE *)(dbp)->q_internal)->re_len + \
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sizeof(QAMDATA) - SSZA(QAMDATA, data), sizeof(u_int32_t)))
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#define QAM_RECNO_PER_PAGE(dbp) (((QUEUE*)(dbp)->q_internal)->rec_page)
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#define QAM_RECNO_PAGE(dbp, recno) \
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(((QUEUE *)(dbp)->q_internal)->q_root \
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+ (((recno) - 1) / QAM_RECNO_PER_PAGE(dbp)))
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#define QAM_RECNO_INDEX(dbp, pgno, recno) \
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(((recno) - 1) - (QAM_RECNO_PER_PAGE(dbp) \
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* (pgno - ((QUEUE *)(dbp)->q_internal)->q_root)))
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#define QAM_GET_RECORD(dbp, page, index) \
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((QAMDATA *)((u_int8_t *)(page) + \
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sizeof(QPAGE) + (ALIGN(sizeof(QAMDATA) - SSZA(QAMDATA, data) + \
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((QUEUE *)(dbp)->q_internal)->re_len, sizeof(u_int32_t)) * index)))
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#define QAM_AFTER_CURRENT(meta, recno) \
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((recno) > (meta)->cur_recno && \
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((meta)->first_recno <= (meta)->cur_recno || (recno) < (meta)->first_recno))
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#define QAM_BEFORE_FIRST(meta, recno) \
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((recno) < (meta)->first_recno && \
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((meta->first_recno <= (meta)->cur_recno || (recno) > (meta)->cur_recno)))
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#define QAM_NOT_VALID(meta, recno) \
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(recno == RECNO_OOB || \
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QAM_BEFORE_FIRST(meta, recno) || QAM_AFTER_CURRENT(meta, recno))
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/*
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* Log opcodes for the mvptr routine.
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*/
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#define QAM_SETFIRST 0x01
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#define QAM_SETCUR 0x02
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/*
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* Parameter to __qam_position.
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*/
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typedef enum {
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QAM_READ,
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QAM_WRITE,
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QAM_CONSUME
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} qam_position_mode;
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typedef enum {
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QAM_PROBE_GET,
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QAM_PROBE_PUT,
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QAM_PROBE_MPF
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} qam_probe_mode;
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#define __qam_fget(dbp, pgnoaddr, flags, addrp) \
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__qam_fprobe(dbp, *pgnoaddr, addrp, QAM_PROBE_GET, flags)
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#define __qam_fput(dbp, pageno, addrp, flags) \
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__qam_fprobe(dbp, pageno, addrp, QAM_PROBE_PUT, flags)
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#include "qam_auto.h"
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#include "qam_ext.h"
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