131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: trxlog.h /main/2 1996/05/09 04:20:43 drk $ */
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/*
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* COMPONENT_NAME: austext
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*
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* FUNCTIONS: BITMAP_SIZE
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* BM_BASE
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* IX_BASE
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* IX_SIZE
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* PZ_BASE
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*
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* ORIGINS: 157
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*
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*/
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/* ********************** EDIT HISTORY *******************************
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SCR DATE INI DESCRIPTION
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----- --------- --- -----------------------------------------------------
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611 21-Feb-89 RSC The defn of BUI for unix and vms needs parenthesis
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*/
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/* trxlog.h - header file to define structures, constants, etc. for the
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memory cache overflow and transaction log file control
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==========================================================================
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*/
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/*
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The following constants control the functioning of the cache overflow
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and transaction logging processes
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BUI The number of bits in an unsigned int
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IX_PAGESIZE The size (in bytes) of an index page
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IX_EPP The number of entries that will fit on an index page
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BITMAP_SIZE The size of the index bitmap (in unsigned int units)
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IX_SIZE The number of index pages needed to control the db pages
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OADDR_OF_IXP Calculates the overflow file address of an index page #
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==========================================================================
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*/
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/* (BITS(unsigned int)) */
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#define BUI (8*sizeof(unsigned int))
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#ifndef NO_TRANS
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/* ((((256*sizeof(F_ADDR))+D_BLKSZ-1) / D_BLKSZ)*D_BLKSZ) */
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#define IX_PAGESIZE 1024
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/* (IX_PAGESIZE / sizeof(F_ADDR)) */
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#define IX_EPP 256
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#define BITMAP_SIZE(pcnt) ((int)((IX_SIZE(pcnt)+(BUI-1)) / BUI))
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#define IX_SIZE(pcnt) ((long)( ((pcnt) + (IX_EPP-1)) / IX_EPP))
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/* Next define the base file offsets for entries in the overflow file */
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#define BM_BASE( file ) ( root_ix[file].base )
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#define IX_BASE(file, pcnt) ((long)(BM_BASE(file) + (BITMAP_SIZE(pcnt)*sizeof(unsigned int))))
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#define PZ_BASE(file, pcnt) ((long)(IX_BASE(file, pcnt) + (IX_SIZE(pcnt)*IX_PAGESIZE)))
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/*
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==========================================================================
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*/
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/* The following typedef'ed structure defines a single entry in the
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root index data. */
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typedef struct RI_ENTRY_S {
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LONG pg_cnt; /* Number of pages currently in file */
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F_ADDR base; /* Base of data stored in overflow */
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BOOLEAN pz_modified; /* Was page zero written to overflow? */
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INT_P Bitmap; /* Used index page bitmap */
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} RI_ENTRY;
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#define bitmap Bitmap.ptr
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#define RI_ENTRY_IOSIZE (sizeof(RI_ENTRY)-sizeof(INT_P)+sizeof(INT *))
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#endif
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/*
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==========================================================================
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*/
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/* page zero table entry */
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#define PGZEROSZ (2*sizeof(F_ADDR)+sizeof(ULONG))
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typedef struct PGZERO_S {
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F_ADDR pz_dchain; /* delete chain pointer */
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F_ADDR pz_next; /* next available record number */
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ULONG pz_timestamp; /* file's timestamp value */
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BOOLEAN pz_modified; /* TRUE if page zero has been modified */
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} PGZERO;
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/* binary search lookup table entry */
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#ifndef NO_TRANS
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/* External declarations */
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extern int trlog_flag; /* Transaction logging enabled flag */
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extern int trcommit; /* Transaction commit in progress flag */
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extern BOOLEAN use_ovfl; /* Do we use the overflow file ? */
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#endif
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/* Maximum number of transactions which can commit a time */
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#ifndef SINGLE_USER
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#define TAFLIMIT 5
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#else
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#define TAFLIMIT 1
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#endif
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#define TRXLOG_H
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/* End - trxlog.h */
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/* vpp -nOS2 -dUNIX -nBSD -nVANILLA_BSD -nVMS -nMEMLOCK -nWINDOWS -nFAR_ALLOC -f/usr/users/master/config/nonwin trxlog.h */
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