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opt / alt / postgresql11 / usr / include / pgsql / server / storage /

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

Editing: off.h

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

#include "storage/itemid.h"
/*
 * OffsetNumber:
 *
 * this is a 1-based index into the linp (ItemIdData) array in the
 * header of each disk page.
 */
typedef uint16 OffsetNumber;

#define InvalidOffsetNumber		((OffsetNumber) 0)
#define FirstOffsetNumber		((OffsetNumber) 1)
#define MaxOffsetNumber			((OffsetNumber) (BLCKSZ / sizeof(ItemIdData)))
#define OffsetNumberMask		(0xffff)		/* valid uint16 bits */

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

/*
 * OffsetNumberIsValid
 *		True iff the offset number is valid.
 */
#define OffsetNumberIsValid(offsetNumber) \
	((bool) ((offsetNumber != InvalidOffsetNumber) && \
			 (offsetNumber <= MaxOffsetNumber)))

/*
 * OffsetNumberNext
 * OffsetNumberPrev
 *		Increments/decrements the argument.  These macros look pointless
 *		but they help us disambiguate the different manipulations on
 *		OffsetNumbers (e.g., sometimes we subtract one from an
 *		OffsetNumber to move back, and sometimes we do so to form a
 *		real C array index).
 */
#define OffsetNumberNext(offsetNumber) \
	((OffsetNumber) (1 + (offsetNumber)))
#define OffsetNumberPrev(offsetNumber) \
	((OffsetNumber) (-1 + (offsetNumber)))

#endif   /* OFF_H */

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Editing: off.h

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