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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 */