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Name	Size	Permission
backendid.h	730 B	-rw-r--r--
barrier.h	6.6 KB	-rw-r--r--
block.h	3.21 KB	-rw-r--r--
buf.h	1.06 KB	-rw-r--r--
buf_internals.h	7.79 KB	-rw-r--r--
buffile.h	1.67 KB	-rw-r--r--
bufmgr.h	7.2 KB	-rw-r--r--
bufpage.h	12.91 KB	-rw-r--r--
copydir.h	561 B	-rw-r--r--
fd.h	3.56 KB	-rw-r--r--
freespace.h	1.23 KB	-rw-r--r--
fsm_internals.h	2.24 KB	-rw-r--r--
indexfsm.h	795 B	-rw-r--r--
ipc.h	2.54 KB	-rw-r--r--
item.h	469 B	-rw-r--r--
itemid.h	4.24 KB	-rw-r--r--
itemptr.h	3.72 KB	-rw-r--r--
large_object.h	2.89 KB	-rw-r--r--
latch.h	5.28 KB	-rw-r--r--
lmgr.h	3.22 KB	-rw-r--r--
lock.h	21.16 KB	-rw-r--r--
lwlock.h	3.58 KB	-rw-r--r--
off.h	1.58 KB	-rw-r--r--
pg_sema.h	2.41 KB	-rw-r--r--
pg_shmem.h	1.95 KB	-rw-r--r--
pmsignal.h	2.03 KB	-rw-r--r--
pos.h	1.56 KB	-rw-r--r--
predicate.h	2.56 KB	-rw-r--r--
predicate_internals.h	16.98 KB	-rw-r--r--
proc.h	9.58 KB	-rw-r--r--
procarray.h	2.96 KB	-rw-r--r--
procsignal.h	1.76 KB	-rw-r--r--
reinit.h	588 B	-rw-r--r--
relfilenode.h	4.31 KB	-rw-r--r--
s_lock.h	28 KB	-rw-r--r--
shmem.h	2.63 KB	-rw-r--r--
sinval.h	4.97 KB	-rw-r--r--
sinvaladt.h	1.49 KB	-rw-r--r--
smgr.h	5.67 KB	-rw-r--r--
spin.h	2.71 KB	-rw-r--r--
standby.h	3.97 KB	-rw-r--r--

Code Editor : block.h

/*-------------------------------------------------------------------------
 *
 * block.h
 *	  POSTGRES disk block definitions.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/block.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef BLOCK_H
#define BLOCK_H

/*
 * BlockNumber:
 *
 * each data file (heap or index) is divided into postgres disk blocks
 * (which may be thought of as the unit of i/o -- a postgres buffer
 * contains exactly one disk block).  the blocks are numbered
 * sequentially, 0 to 0xFFFFFFFE.
 *
 * InvalidBlockNumber is the same thing as P_NEW in buf.h.
 *
 * the access methods, the buffer manager and the storage manager are
 * more or less the only pieces of code that should be accessing disk
 * blocks directly.
 */
typedef uint32 BlockNumber;

#define InvalidBlockNumber		((BlockNumber) 0xFFFFFFFF)

#define MaxBlockNumber			((BlockNumber) 0xFFFFFFFE)

/*
 * BlockId:
 *
 * 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).
 *
 * there doesn't appear to be any reason to have separate types except
 * for the fact that BlockIds can be SHORTALIGN'd (and therefore any
 * structures that contains them, such as ItemPointerData, can also be
 * SHORTALIGN'd).  this is an important consideration for reducing the
 * space requirements of the line pointer (ItemIdData) array on each
 * 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 BlockIdData *BlockId;	/* block identifier */

/* ----------------
 *		support macros
 * ----------------
 */

/*
 * BlockNumberIsValid
 *		True iff blockNumber is valid.
 */
#define BlockNumberIsValid(blockNumber) \
	((bool) ((BlockNumber) (blockNumber) != InvalidBlockNumber))

/*
 * BlockIdIsValid
 *		True iff the block identifier is valid.
 */
#define BlockIdIsValid(blockId) \
	((bool) PointerIsValid(blockId))

/*
 * BlockIdSet
 *		Sets a block identifier to the specified value.
 */
#define BlockIdSet(blockId, blockNumber) \
( \
	AssertMacro(PointerIsValid(blockId)), \
	(blockId)->bi_hi = (blockNumber) >> 16, \
	(blockId)->bi_lo = (blockNumber) & 0xffff \
)

/*
 * BlockIdCopy
 *		Copy a block identifier.
 */
#define BlockIdCopy(toBlockId, fromBlockId) \
( \
	AssertMacro(PointerIsValid(toBlockId)), \
	AssertMacro(PointerIsValid(fromBlockId)), \
	(toBlockId)->bi_hi = (fromBlockId)->bi_hi, \
	(toBlockId)->bi_lo = (fromBlockId)->bi_lo \
)

/*
 * BlockIdEquals
 *		Check for block number equality.
 */
#define BlockIdEquals(blockId1, blockId2) \
	((blockId1)->bi_hi == (blockId2)->bi_hi && \
	 (blockId1)->bi_lo == (blockId2)->bi_lo)

/*
 * BlockIdGetBlockNumber
 *		Retrieve the block number from a block identifier.
 */
#define BlockIdGetBlockNumber(blockId) \
( \
	AssertMacro(BlockIdIsValid(blockId)), \
	(BlockNumber) (((blockId)->bi_hi << 16) | ((uint16) (blockId)->bi_lo)) \
)

#endif   /* BLOCK_H */

${this.title}

Code Editor : block.h