File Manager

Hackfut Security File Manager

Current Path: /opt/alt/postgresql11/usr/include/pgsql/server/storage

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: itemid.h

/*-------------------------------------------------------------------------
 *
 * itemid.h
 *	  Standard POSTGRES buffer page item identifier definitions.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/itemid.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef ITEMID_H
#define ITEMID_H

/*
 * An item pointer (also called line pointer) on a buffer page
 *
 * In some cases an item pointer is "in use" but does not have any associated
 * storage on the page.  By convention, lp_len == 0 in every item pointer
 * that does not have storage, independently of its lp_flags state.
 */
typedef struct ItemIdData
{
	unsigned	lp_off:15,		/* offset to tuple (from start of page) */
				lp_flags:2,		/* state of item pointer, see below */
				lp_len:15;		/* byte length of tuple */
} ItemIdData;

typedef ItemIdData *ItemId;

/*
 * lp_flags has these possible states.  An UNUSED line pointer is available
 * for immediate re-use, the other states are not.
 */
#define LP_UNUSED		0		/* unused (should always have lp_len=0) */
#define LP_NORMAL		1		/* used (should always have lp_len>0) */
#define LP_REDIRECT		2		/* HOT redirect (should have lp_len=0) */
#define LP_DEAD			3		/* dead, may or may not have storage */

/*
 * Item offsets and lengths are represented by these types when
 * they're not actually stored in an ItemIdData.
 */
typedef uint16 ItemOffset;
typedef uint16 ItemLength;

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

/*
 *		ItemIdGetLength
 */
#define ItemIdGetLength(itemId) \
   ((itemId)->lp_len)

/*
 *		ItemIdGetOffset
 */
#define ItemIdGetOffset(itemId) \
   ((itemId)->lp_off)

/*
 *		ItemIdGetFlags
 */
#define ItemIdGetFlags(itemId) \
   ((itemId)->lp_flags)

/*
 *		ItemIdGetRedirect
 * In a REDIRECT pointer, lp_off holds the link to the next item pointer
 */
#define ItemIdGetRedirect(itemId) \
   ((itemId)->lp_off)

/*
 * ItemIdIsValid
 *		True iff item identifier is valid.
 *		This is a pretty weak test, probably useful only in Asserts.
 */
#define ItemIdIsValid(itemId)	PointerIsValid(itemId)

/*
 * ItemIdIsUsed
 *		True iff item identifier is in use.
 */
#define ItemIdIsUsed(itemId) \
	((itemId)->lp_flags != LP_UNUSED)

/*
 * ItemIdIsNormal
 *		True iff item identifier is in state NORMAL.
 */
#define ItemIdIsNormal(itemId) \
	((itemId)->lp_flags == LP_NORMAL)

/*
 * ItemIdIsRedirected
 *		True iff item identifier is in state REDIRECT.
 */
#define ItemIdIsRedirected(itemId) \
	((itemId)->lp_flags == LP_REDIRECT)

/*
 * ItemIdIsDead
 *		True iff item identifier is in state DEAD.
 */
#define ItemIdIsDead(itemId) \
	((itemId)->lp_flags == LP_DEAD)

/*
 * ItemIdHasStorage
 *		True iff item identifier has associated storage.
 */
#define ItemIdHasStorage(itemId) \
	((itemId)->lp_len != 0)

/*
 * ItemIdSetUnused
 *		Set the item identifier to be UNUSED, with no storage.
 *		Beware of multiple evaluations of itemId!
 */
#define ItemIdSetUnused(itemId) \
( \
	(itemId)->lp_flags = LP_UNUSED, \
	(itemId)->lp_off = 0, \
	(itemId)->lp_len = 0 \
)

/*
 * ItemIdSetNormal
 *		Set the item identifier to be NORMAL, with the specified storage.
 *		Beware of multiple evaluations of itemId!
 */
#define ItemIdSetNormal(itemId, off, len) \
( \
	(itemId)->lp_flags = LP_NORMAL, \
	(itemId)->lp_off = (off), \
	(itemId)->lp_len = (len) \
)

/*
 * ItemIdSetRedirect
 *		Set the item identifier to be REDIRECT, with the specified link.
 *		Beware of multiple evaluations of itemId!
 */
#define ItemIdSetRedirect(itemId, link) \
( \
	(itemId)->lp_flags = LP_REDIRECT, \
	(itemId)->lp_off = (link), \
	(itemId)->lp_len = 0 \
)

/*
 * ItemIdSetDead
 *		Set the item identifier to be DEAD, with no storage.
 *		Beware of multiple evaluations of itemId!
 */
#define ItemIdSetDead(itemId) \
( \
	(itemId)->lp_flags = LP_DEAD, \
	(itemId)->lp_off = 0, \
	(itemId)->lp_len = 0 \
)

/*
 * ItemIdMarkDead
 *		Set the item identifier to be DEAD, keeping its existing storage.
 *
 * Note: in indexes, this is used as if it were a hint-bit mechanism;
 * we trust that multiple processors can do this in parallel and get
 * the same result.
 */
#define ItemIdMarkDead(itemId) \
( \
	(itemId)->lp_flags = LP_DEAD \
)

#endif   /* ITEMID_H */

Hackfut Security File Manager

Editing: itemid.h

Upload File

Create Folder