Line data    Source code

       1             : /*
       2             :  * SPDX-License-Identifier: MPL-2.0
       3             :  *
       4             :  * This Source Code Form is subject to the terms of the Mozilla Public
       5             :  * License, v. 2.0.  If a copy of the MPL was not distributed with this
       6             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       7             :  *
       8             :  * Copyright 2024 MonetDB Foundation;
       9             :  * Copyright August 2008 - 2023 MonetDB B.V.;
      10             :  * Copyright 1997 - July 2008 CWI.
      11             :  */
      12             : 
      13             : #ifndef _GDK_DELTA_H_
      14             : #define _GDK_DELTA_H_
      15             : 
      16             : /*
      17             :  * We make sure here that the BUNs section of a BAT at least starts 4
      18             :  * bytes from the BUN start.  This ensures that the first data item of
      19             :  * e.g. a BAT[void,bit] is (at least) integer aligned.  This optimizes
      20             :  * processing on such BATs (DDBENCH).
      21             :  */
      22             : static inline void
      23    10570887 : DELTAinit(BAT *b)
      24             : {
      25    10570887 :         BATsetcount(b, 0);
      26    10585856 :         b->theap->free = 0;
      27    10585856 :         b->batInserted = 0;
      28    10585856 :         b->tshift = ATOMelmshift(b->twidth);
      29    10585856 :         TRC_DEBUG(DELTA,
      30             :                   "%s free %zu ins " BUNFMT " base %p\n",
      31             :                   BBP_logical(b->batCacheid),
      32             :                   b->theap->free,
      33             :                   b->batInserted,
      34             :                   b->theap->base);
      35    10585856 : }
      36             : 
      37             : /*
      38             :  * Upon saving a BAT, we should convert the delta marker BUN pointers
      39             :  * into indexes and convert them back into pointers upon reload.
      40             :  *
      41             :  * The BATdirty(b) tells you whether a BAT's main memory
      42             :  * representation differs from its saved image on stable storage. But
      43             :  * *not* whether it has changed since last transaction commit (it can
      44             :  * be storage-clean, but transaction-dirty). For this we have
      45             :  * DELTAdirty(b).
      46             :  */
      47             : #define DELTAdirty(b)   ((b)->batInserted < BATcount(b))
      48             : 
      49             : #endif /* _GDK_DELTA_H_ */