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46 lines
1.4 KiB
46 lines
1.4 KiB
2 years ago
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 1997 - July 2008 CWI, August 2008 - 2022 MonetDB B.V.
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*/
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#ifndef _GDK_DELTA_H_
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#define _GDK_DELTA_H_
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/*
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* We make sure here that the BUNs section of a BAT at least starts 4
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* bytes from the BUN start. This ensures that the first data item of
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* e.g. a BAT[void,bit] is (at least) integer aligned. This optimizes
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* processing on such BATs (DDBENCH).
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*/
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static inline void
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DELTAinit(BAT *b)
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{
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BATsetcount(b, 0);
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b->theap->free = 0;
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b->batInserted = 0;
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b->tshift = ATOMelmshift(Tsize(b));
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TRC_DEBUG(DELTA,
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"%s free %zu ins " BUNFMT " base %p\n",
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BBP_logical(b->batCacheid),
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b->theap->free,
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b->batInserted,
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b->theap->base);
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}
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/*
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* Upon saving a BAT, we should convert the delta marker BUN pointers
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* into indexes and convert them back into pointers upon reload.
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*
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* The BATdirty(b) tells you whether a BAT's main memory
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* representation differs from its saved image on stable storage. But
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* *not* whether it has changed since last transaction commit (it can
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* be storage-clean, but transaction-dirty). For this we have
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* DELTAdirty(b).
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*/
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#define DELTAdirty(b) ((b)->batInserted < BUNlast(b))
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#endif /* _GDK_DELTA_H_ */
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