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65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
/*
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* PROGRAM: JRD Access Method
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* MODULE: sdw.h
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* DESCRIPTION: Shadowing definitions
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*
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* The contents of this file are subject to the Interbase Public
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* License Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy
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* of the License at http://www.Inprise.com/IPL.html
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*
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* Software distributed under the License is distributed on an
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* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code was created by Inprise Corporation
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* and its predecessors. Portions created by Inprise Corporation are
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* Copyright (C) Inprise Corporation.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef JRD_SDW_H
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#define JRD_SDW_H
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#include "../include/fb_blk.h"
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namespace Jrd {
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class jrd_file;
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/* Shadowing block */
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class Shadow : public pool_alloc<type_sdw>
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{
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public:
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Shadow* sdw_next; // next in linked list
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jrd_file* sdw_file; // Stack of shadow files
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USHORT sdw_number; // number of shadow
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USHORT sdw_flags;
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};
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// sdw_flags
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const USHORT SDW_dumped = 1; /* bit set when file has been copied */
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const USHORT SDW_shutdown = 2; /* stop shadowing on next cache flush */
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const USHORT SDW_manual = 4; /* shadow is a manual shadow--don't delete */
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const USHORT SDW_delete = 8; /* delete the shadow at the next shutdown */
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const USHORT SDW_found = 16; /* flag to mark shadow found in database */
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const USHORT SDW_rollover = 32; /* this shadow was rolled over to when the main db file went away */
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const USHORT SDW_conditional = 64; /* shadow to be used if another shadow becomes unavailable */
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/* these macros are a convenient combination of switches:
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the first specifies the shadow is invalid for writing to;
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the second specifies that the shadow no SLONGer exists and the
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shadow block simply hasn't been cleared out yet */
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const USHORT SDW_INVALID = (SDW_shutdown | SDW_delete | SDW_rollover | SDW_conditional);
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const USHORT SDW_IGNORE = (SDW_shutdown | SDW_delete);
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} //namespace Jrd
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#endif // JRD_SDW_H
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