diff options
Diffstat (limited to 'src/include/storage/block.h')
| -rw-r--r-- | src/include/storage/block.h | 65 |
1 files changed, 33 insertions, 32 deletions
diff --git a/src/include/storage/block.h b/src/include/storage/block.h index 993d7f8257e..9702b53e2eb 100644 --- a/src/include/storage/block.h +++ b/src/include/storage/block.h @@ -1,16 +1,16 @@ /*------------------------------------------------------------------------- * * block.h-- - * POSTGRES disk block definitions. + * POSTGRES disk block definitions. * * * Copyright (c) 1994, Regents of the University of California * - * $Id: block.h,v 1.2 1996/10/31 09:49:40 scrappy Exp $ + * $Id: block.h,v 1.3 1997/09/07 05:00:42 momjian Exp $ * *------------------------------------------------------------------------- */ -#ifndef BLOCK_H +#ifndef BLOCK_H #define BLOCK_H /* @@ -29,12 +29,12 @@ */ typedef uint32 BlockNumber; -#define InvalidBlockNumber ((BlockNumber) 0xFFFFFFFF) +#define InvalidBlockNumber ((BlockNumber) 0xFFFFFFFF) /* * BlockId: * - * this is a storage type for BlockNumber. in other words, this type + * this is a storage type for BlockNumber. in other words, this type * is used for on-disk structures (e.g., in HeapTupleData) whereas * BlockNumber is the type on which calculations are performed (e.g., * in access method code). @@ -47,66 +47,67 @@ typedef uint32 BlockNumber; * page and the header of each heap or index tuple, so it doesn't seem * wise to change this without good reason. */ -typedef struct BlockIdData { - uint16 bi_hi; - uint16 bi_lo; -} BlockIdData; +typedef struct BlockIdData +{ + uint16 bi_hi; + uint16 bi_lo; +} BlockIdData; -typedef BlockIdData *BlockId; /* block identifier */ +typedef BlockIdData *BlockId; /* block identifier */ /* ---------------- - * support macros + * support macros * ---------------- */ /* * BlockNumberIsValid -- - * True iff blockNumber is valid. + * True iff blockNumber is valid. */ #define BlockNumberIsValid(blockNumber) \ - ((bool) ((int32) (blockNumber) != InvalidBlockNumber)) + ((bool) ((int32) (blockNumber) != InvalidBlockNumber)) /* * BlockIdIsValid -- - * True iff the block identifier is valid. + * True iff the block identifier is valid. */ #define BlockIdIsValid(blockId) \ - ((bool) PointerIsValid(blockId)) + ((bool) PointerIsValid(blockId)) /* * BlockIdSet -- - * Sets a block identifier to the specified value. + * Sets a block identifier to the specified value. */ #define BlockIdSet(blockId, blockNumber) \ - Assert(PointerIsValid(blockId)); \ - (blockId)->bi_hi = (blockNumber) >> 16; \ - (blockId)->bi_lo = (blockNumber) & 0xffff + Assert(PointerIsValid(blockId)); \ + (blockId)->bi_hi = (blockNumber) >> 16; \ + (blockId)->bi_lo = (blockNumber) & 0xffff /* * BlockIdCopy -- - * Copy a block identifier. + * Copy a block identifier. */ #define BlockIdCopy(toBlockId, fromBlockId) \ - Assert(PointerIsValid(toBlockId)); \ - Assert(PointerIsValid(fromBlockId)); \ - (toBlockId)->bi_hi = (fromBlockId)->bi_hi; \ - (toBlockId)->bi_lo = (fromBlockId)->bi_lo + Assert(PointerIsValid(toBlockId)); \ + Assert(PointerIsValid(fromBlockId)); \ + (toBlockId)->bi_hi = (fromBlockId)->bi_hi; \ + (toBlockId)->bi_lo = (fromBlockId)->bi_lo /* * BlockIdEquals -- - * Check for block number equality. + * Check for block number equality. */ #define BlockIdEquals(blockId1, blockId2) \ - ((blockId1)->bi_hi == (blockId2)->bi_hi && \ - (blockId1)->bi_lo == (blockId2)->bi_lo) + ((blockId1)->bi_hi == (blockId2)->bi_hi && \ + (blockId1)->bi_lo == (blockId2)->bi_lo) /* * BlockIdGetBlockNumber -- - * Retrieve the block number from a block identifier. + * Retrieve the block number from a block identifier. */ #define BlockIdGetBlockNumber(blockId) \ - (AssertMacro(BlockIdIsValid(blockId)) ? \ - (BlockNumber) (((blockId)->bi_hi << 16) | ((uint16) (blockId)->bi_lo)) : \ - (BlockNumber) InvalidBlockNumber) + (AssertMacro(BlockIdIsValid(blockId)) ? \ + (BlockNumber) (((blockId)->bi_hi << 16) | ((uint16) (blockId)->bi_lo)) : \ + (BlockNumber) InvalidBlockNumber) -#endif /* BLOCK_H */ +#endif /* BLOCK_H */ |