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📁 ..
📄 backendid.h(1.1 KB)
📄 barrier.h(674 B)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(12.24 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(9 KB)
📄 bufpage.h(14.91 KB)
📄 checksum.h(666 B)
📄 checksum_impl.h(8.59 KB)
📄 copydir.h(561 B)
📄 dsm.h(1.95 KB)
📄 dsm_impl.h(2.12 KB)
📄 fd.h(4.27 KB)
📄 freespace.h(1.36 KB)
📄 fsm_internals.h(2.26 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.67 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.93 KB)
📄 large_object.h(3.6 KB)
📄 latch.h(6.55 KB)
📄 lmgr.h(4.19 KB)
📄 lock.h(22.89 KB)
📄 lockdefs.h(1.86 KB)
📄 lwlock.h(9.19 KB)
📄 lwlocknames.h(2.42 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.39 KB)
📄 pg_shmem.h(2.23 KB)
📄 pmsignal.h(2.1 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.96 KB)
📄 proc.h(10.81 KB)
📄 procarray.h(3.5 KB)
📄 procsignal.h(1.9 KB)
📄 reinit.h(592 B)
📄 relfilenode.h(3.81 KB)
📄 s_lock.h(28.64 KB)
📄 shm_mq.h(2.59 KB)
📄 shm_toc.h(2.01 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(5.41 KB)
📄 sinvaladt.h(1.58 KB)
📄 smgr.h(5.96 KB)
📄 spin.h(2.42 KB)
📄 standby.h(3.35 KB)
📄 standbydefs.h(2.25 KB)

Editing: itemptr.h

/*-------------------------------------------------------------------------
 *
 * itemptr.h
 *	  POSTGRES disk item pointer definitions.
 *
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/itemptr.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef ITEMPTR_H
#define ITEMPTR_H

#include "storage/block.h"
#include "storage/off.h"

/*
 * ItemPointer:
 *
 * This is a pointer to an item within a disk page of a known file
 * (for example, a cross-link from an index to its parent table).
 * blkid tells us which block, posid tells us which entry in the linp
 * (ItemIdData) array we want.
 *
 * Note: because there is an item pointer in each tuple header and index
 * tuple header on disk, it's very important not to waste space with
 * structure padding bytes.  The struct is designed to be six bytes long
 * (it contains three int16 fields) but a few compilers will pad it to
 * eight bytes unless coerced.  We apply appropriate persuasion where
 * possible, and to cope with unpersuadable compilers, we try to use
 * "SizeOfIptrData" rather than "sizeof(ItemPointerData)" when computing
 * on-disk sizes.
 */
typedef struct ItemPointerData
{
	BlockIdData ip_blkid;
	OffsetNumber ip_posid;
}
/* If compiler understands packed and aligned pragmas, use those */
#if defined(pg_attribute_packed) && defined(pg_attribute_aligned)
pg_attribute_packed()
pg_attribute_aligned(2)
#endif
ItemPointerData;

#define SizeOfIptrData	\
	(offsetof(ItemPointerData, ip_posid) + sizeof(OffsetNumber))

typedef ItemPointerData *ItemPointer;

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

/*
 * ItemPointerIsValid
 *		True iff the disk item pointer is not NULL.
 */
#define ItemPointerIsValid(pointer) \
	((bool) (PointerIsValid(pointer) && ((pointer)->ip_posid != 0)))

/*
 * ItemPointerGetBlockNumber
 *		Returns the block number of a disk item pointer.
 */
#define ItemPointerGetBlockNumber(pointer) \
( \
	AssertMacro(ItemPointerIsValid(pointer)), \
	BlockIdGetBlockNumber(&(pointer)->ip_blkid) \
)

/*
 * ItemPointerGetOffsetNumber
 *		Returns the offset number of a disk item pointer.
 */
#define ItemPointerGetOffsetNumber(pointer) \
( \
	AssertMacro(ItemPointerIsValid(pointer)), \
	(pointer)->ip_posid \
)

/*
 * ItemPointerSet
 *		Sets a disk item pointer to the specified block and offset.
 */
#define ItemPointerSet(pointer, blockNumber, offNum) \
( \
	AssertMacro(PointerIsValid(pointer)), \
	BlockIdSet(&((pointer)->ip_blkid), blockNumber), \
	(pointer)->ip_posid = offNum \
)

/*
 * ItemPointerSetBlockNumber
 *		Sets a disk item pointer to the specified block.
 */
#define ItemPointerSetBlockNumber(pointer, blockNumber) \
( \
	AssertMacro(PointerIsValid(pointer)), \
	BlockIdSet(&((pointer)->ip_blkid), blockNumber) \
)

/*
 * ItemPointerSetOffsetNumber
 *		Sets a disk item pointer to the specified offset.
 */
#define ItemPointerSetOffsetNumber(pointer, offsetNumber) \
( \
	AssertMacro(PointerIsValid(pointer)), \
	(pointer)->ip_posid = (offsetNumber) \
)

/*
 * ItemPointerCopy
 *		Copies the contents of one disk item pointer to another.
 *
 * Should there ever be padding in an ItemPointer this would need to be handled
 * differently as it's used as hash key.
 */
#define ItemPointerCopy(fromPointer, toPointer) \
( \
	AssertMacro(PointerIsValid(toPointer)), \
	AssertMacro(PointerIsValid(fromPointer)), \
	*(toPointer) = *(fromPointer) \
)

/*
 * ItemPointerSetInvalid
 *		Sets a disk item pointer to be invalid.
 */
#define ItemPointerSetInvalid(pointer) \
( \
	AssertMacro(PointerIsValid(pointer)), \
	BlockIdSet(&((pointer)->ip_blkid), InvalidBlockNumber), \
	(pointer)->ip_posid = InvalidOffsetNumber \
)

/* ----------------
 *		externs
 * ----------------
 */

extern bool ItemPointerEquals(ItemPointer pointer1, ItemPointer pointer2);
extern int32 ItemPointerCompare(ItemPointer arg1, ItemPointer arg2);

#endif   /* ITEMPTR_H */

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Editing: itemptr.h

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