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#ifndef _GTM_GXID_H
#define _GTM_GXID_H
/* ----------------
* Special transaction ID values
*
* BootstrapGlobalTransactionId is the XID for "bootstrap" operations, and
* FrozenGlobalTransactionId is used for very old tuples. Both should
* always be considered valid.
*
* FirstNormalGlobalTransactionId is the first "normal" transaction id.
* Note: if you need to change it, you must change pg_class.h as well.
* ----------------
*/
#define FirstNormalGlobalTransactionId ((GlobalTransactionId) 3)
#define MaxGlobalTransactionId ((GlobalTransactionId) 0xFFFFFFFF)
/* ----------------
* transaction ID manipulation macros
* ----------------
*/
#define GlobalTransactionIdIsNormal(xid) ((xid) >= FirstNormalGlobalTransactionId)
#define GlobalTransactionIdEquals(id1, id2) ((id1) == (id2))
/* advance a transaction ID variable, handling wraparound correctly */
#define GlobalTransactionIdAdvance(dest) \
do { \
(dest)++; \
if ((dest) < FirstNormalGlobalTransactionId) \
(dest) = FirstNormalGlobalTransactionId; \
} while(0)
extern bool GlobalTransactionIdPrecedes(GlobalTransactionId id1, GlobalTransactionId id2);
extern bool GlobalTransactionIdPrecedesOrEquals(GlobalTransactionId id1, GlobalTransactionId id2);
extern bool GlobalTransactionIdFollows(GlobalTransactionId id1, GlobalTransactionId id2);
extern bool GlobalTransactionIdFollowsOrEquals(GlobalTransactionId id1, GlobalTransactionId id2);
#endif
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