FileControl.mesa
Last edited by:
Taft on April 14, 1983 3:07 pm
Kolling on May 27, 1983 2:04 pm
DIRECTORY
AlpineEnvironment,
AlpineInternal;
FileControl: DEFINITIONS =
BEGIN
Procedures called from the Transaction manager to control the completion of File actions
CommitPhase1: PROCEDURE [trans: AlpineInternal.TransHandle] RETURNS [readOnly: BOOLEAN];
! Lock.Failed, Lock.TransAborting;
Notifies the File machinery that phase 1 of commit has begun: no new AlpineFile operations are possible, and the File machinery should ensure that all actions have been logged and that its data structures are in a good state for either commit or abort. Returns readOnly=TRUE if no files were updated during trans.
CommitPhase2: PROCEDURE [trans, newTrans: AlpineInternal.TransHandle];
Notifies the File machinery that phase 2 of commit for trans has finished with outcome = commit. CommitPhase1 must have been called previously. The File machinery should now begin carrying out any deferred actions for the transaction (however, CommitPhase2 does not necessarily wait for those actions to be completed). If newTrans # TransactionMap.nullHandle then newTrans is the continuation of trans.
Abort: PROCEDURE [trans: AlpineInternal.TransHandle];
Notifies the File machinery that phase 2 of commit has finished with outcome = abort. CommitPhase1 may or may not have been called previously. This procedure performs any file-related undo actions before returning.
Procedures called during recovery
CallBeforeUpdatePass: PROCEDURE;
Called to notify AlpineFileImpls that the update pass of recovery is beginning.
CallAfterUpdatePass: PROCEDURE;
Called to notify AlpineFileImpls that the update pass of recovery has ended.
Initialization
Initialize: PROCEDURE;
Initializes the entire AlpineFileImpls configuration. No prerequisites. May be called only once.
RegisterVolumeGroup: PROCEDURE [volumeGroupID: AlpineEnvironment.VolumeGroupID, volumes: LIST OF AlpineEnvironment.VolumeID];
TEMPORARY (until we figure out how this should really be done...)
Registers a volume group consisting of the specified volumes. Must be called after Initialize and before any operation that specifies a VolumeID or VolumeGroupID (AlpineFile.Open, AlpineFile.Create). Fatal error if volumeGroupID or any of volumes has already been registered.
END.