Improve comment for GetStableLatestTransactionId().

2012-05-31 11:20:02 -04:00 · 2012-05-31 11:20:02 -04:00 · a04dc87db1
parent a2b516dab9
commit a04dc87db1
1 changed files with 4 additions and 2 deletions
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@ -393,8 +393,10 @@ GetCurrentTransactionIdIfAny(void)
 /*
 *	GetStableLatestTransactionId
 *
- * Get the XID once and then return same value for rest of transaction.
- * Acts as a useful reference point for maintenance tasks.
+ * Get the transaction's XID if it has one, else read the next-to-be-assigned
+ * XID.  Once we have a value, return that same value for the remainder of the
+ * current transaction.  This is meant to provide the reference point for the
+ * age(xid) function, but might be useful for other maintenance tasks as well.
 */
 TransactionId
 GetStableLatestTransactionId(void)