postgres.git / summary / log / commit / refs

commit    a04dc87db140ddfb86008f424b8c4b2b6eeaa4cf
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Thu May 31 15:20:02 2012 +0000
First released in: 9.2.0

    Improve comment for GetStableLatestTransactionId().


 src/backend/access/transam/xact.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 5ae46dee9b5..49c14cb64c0 100644
--- 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)


[parent: a2b516dab9b9]