You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
2.7 KiB
95 lines
2.7 KiB
3 years ago
|
/*-
|
||
|
|
* See the file LICENSE for redistribution information.
|
||
|
|
*
|
||
|
|
* Copyright (c) 1999
|
||
|
|
* Sleepycat Software. All rights reserved.
|
||
|
|
*
|
||
|
|
* @(#)qam.h 11.7 (Sleepycat) 9/10/99
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* QAM data elements: a status field and the data.
|
||
|
|
*/
|
||
|
|
typedef struct _qamdata {
|
||
|
|
u_int8_t flags; /* 00: delete bit. */
|
||
|
|
#define QAM_VALID 0x01
|
||
|
|
#define QAM_SET 0x02
|
||
|
|
u_int8_t data[1]; /* Record. */
|
||
|
|
} QAMDATA;
|
||
|
|
|
||
|
|
struct __queue; typedef struct __queue QUEUE;
|
||
|
|
struct __qcursor; typedef struct __qcursor QUEUE_CURSOR;
|
||
|
|
|
||
|
|
struct __qcursor {
|
||
|
|
/* Per-thread information: queue private. */
|
||
|
|
PAGE *page; /* Cursor page. */
|
||
|
|
db_recno_t start; /* start record number. */
|
||
|
|
db_recno_t recno; /* Current record number. */
|
||
|
|
|
||
|
|
db_pgno_t pgno; /* Page. */
|
||
|
|
db_indx_t indx; /* Page item ref'd by the cursor. */
|
||
|
|
|
||
|
|
DB_LOCK lock; /* Cursor lock. */
|
||
|
|
db_lockmode_t lock_mode; /* Lock mode. */
|
||
|
|
|
||
|
|
u_int32_t flags;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The in-memory, per-tree queue data structure.
|
||
|
|
*/
|
||
|
|
struct __queue {
|
||
|
|
db_pgno_t q_meta; /* Database meta-data page. */
|
||
|
|
db_pgno_t q_root; /* Database root page. */
|
||
|
|
|
||
|
|
int re_pad; /* Fixed-length padding byte. */
|
||
|
|
u_int32_t re_len; /* Length for fixed-length records. */
|
||
|
|
u_int32_t rec_page; /* records per page */
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Caculate the page number of a recno
|
||
|
|
*
|
||
|
|
* Number of records per page =
|
||
|
|
* Divide the available space on the page by the record len + header.
|
||
|
|
*
|
||
|
|
* Page number for record =
|
||
|
|
* divide the physical record number by the records per page
|
||
|
|
* add the root page number
|
||
|
|
* For now the root page will always be 1, but we might want to change
|
||
|
|
* in the future (e.g. multiple fixed len queues per file).
|
||
|
|
*
|
||
|
|
* Index of record on page =
|
||
|
|
* physical record number, less the logical pno times records/page
|
||
|
|
*/
|
||
|
|
#define CALC_QAM_RECNO_PER_PAGE(dbp) \
|
||
|
|
(((dbp)->pgsize - ALIGN(sizeof(QPAGE), sizeof(u_int32_t))) / \
|
||
|
|
ALIGN(((QUEUE *)(dbp)->q_internal)->re_len + \
|
||
|
|
sizeof(QAMDATA) - sizeof ((QAMDATA *)0)->data, sizeof(u_int32_t)))
|
||
|
|
|
||
|
|
#define QAM_RECNO_PER_PAGE(dbp) (((QUEUE*)(dbp)->q_internal)->rec_page)
|
||
|
|
|
||
|
|
#define QAM_RECNO_PAGE(dbp, start, recno) \
|
||
|
|
(((QUEUE *)(dbp)->q_internal)->q_root \
|
||
|
|
+ (((recno) - (start)) / QAM_RECNO_PER_PAGE(dbp)))
|
||
|
|
|
||
|
|
#define QAM_RECNO_INDEX(dbp, pgno, start, recno) \
|
||
|
|
(((recno) - (start)) - \
|
||
|
|
(QAM_RECNO_PER_PAGE(dbp) * \
|
||
|
|
(pgno - ((QUEUE *)(dbp)->q_internal)->q_root)))
|
||
|
|
|
||
|
|
#define QAM_GET_RECORD(dbp, page, index) \
|
||
|
|
((QAMDATA *) ((char *)(page) + \
|
||
|
|
ALIGN(sizeof(QPAGE), sizeof(u_int32_t)) + \
|
||
|
|
(ALIGN(sizeof(QAMDATA) - sizeof ((QAMDATA *)0)->data + \
|
||
|
|
((QUEUE *)(dbp)->q_internal)->re_len, sizeof (u_int32_t)) * index)))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Log opcodes for the mvptr routine.
|
||
|
|
*/
|
||
|
|
#define QAM_SETFIRST 0x01
|
||
|
|
#define QAM_SETCUR 0x02
|
||
|
|
|
||
|
|
#include "qam_auto.h"
|
||
|
|
#include "qam_ext.h"
|