File DBStorageTuplesetScan.mesa
Copyright © 1985 by Xerox Corporation. All rights reserved.
Last edited by
MBrown on December 2, 1982 2:40 pm
Cattell on November 2, 1983 3:17 pm
Willie-Sue, February 15, 1985 11:22:33 am PST
Donahue, May 22, 1986 11:24:27 am PDT
DIRECTORY
DBCommon USING[DBPage, TID];
DBStorageTuplesetScan:
CEDAR
DEFINITIONS =
BEGIN
OPEN DBCommon;
This interface defines internal operations on tupleset scans.
Init:
PROC;
Should be called from DBStorage.Initialize.
NoticeDeletion:
PROC[dbPage: DBPage, tsID:
TID, localTSID:
CARDINAL, nextDBPage: DBPage];
Update active tupleset scans, as necessary, to account for the fact that page dbPage no longer contains any tuples from tupleset tsID, which used to have index localTSID on the page's TSDict. The "next page" field of that TSDict entry (i.e. the next page containing tuples from this tupleset) was nextDBPage.
CallAfterFinishTransaction:
PROC;
Invalidates all active scans on Segments that are no longer addressible (because transaction went away). Invalidation includes releasing tuples that are part of the scan.
END.--DBStorageTuplesetScan
CHANGE LOG
Created by MBrown on July 9, 1980 5:54 PM
Changed by MBrown on August 4, 1980 10:30 PM
Added NoticeCloseDatabase.
Changed by MBrown on September 12, 1980 1:46 PM
Added Finalize.
Changed by MBrown on December 11, 1980 2:47 PM
Clarified exceptions associated with NoticeCloseDatabase.
Changed by MBrown on December 2, 1982 2:39 pm
Added CallAfterFinishTransaction; flushed NoticeCloseDatabase and Finalize.
Changed by Willie-Sue on February 15, 1985
made Cedar, added tioga formatting