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95 lines
2.7 KiB
95 lines
2.7 KiB
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1999
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* Sleepycat Software. All rights reserved.
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*
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* @(#)qam.h 11.7 (Sleepycat) 9/10/99
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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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/* Per-thread information: queue private. */
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PAGE *page; /* Cursor page. */
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db_recno_t start; /* start record number. */
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db_recno_t recno; /* Current record number. */
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db_pgno_t pgno; /* Page. */
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db_indx_t indx; /* Page item ref'd by the cursor. */
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DB_LOCK lock; /* Cursor lock. */
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db_lockmode_t lock_mode; /* Lock mode. */
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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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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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};
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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 - ALIGN(sizeof(QPAGE), sizeof(u_int32_t))) / \
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ALIGN(((QUEUE *)(dbp)->q_internal)->re_len + \
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sizeof(QAMDATA) - sizeof ((QAMDATA *)0)->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, start, recno) \
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(((QUEUE *)(dbp)->q_internal)->q_root \
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+ (((recno) - (start)) / QAM_RECNO_PER_PAGE(dbp)))
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#define QAM_RECNO_INDEX(dbp, pgno, start, recno) \
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(((recno) - (start)) - \
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(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 *) ((char *)(page) + \
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ALIGN(sizeof(QPAGE), sizeof(u_int32_t)) + \
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(ALIGN(sizeof(QAMDATA) - sizeof ((QAMDATA *)0)->data + \
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((QUEUE *)(dbp)->q_internal)->re_len, sizeof (u_int32_t)) * index)))
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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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#include "qam_auto.h"
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#include "qam_ext.h"
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