-- DiskDriverShared.mesa (last edited by: Luniewski on: December 10, 1980 4:07 PM)

DIRECTORY

DiskChannel USING [Cylinder, IORequestHandle, Sector],

DiskChannelBackend USING [DriveObject];

DiskDriverShared: DEFINITIONS =

BEGIN

ScheduleHandle: TYPE = LONG POINTER TO ScheduleObject;

ScheduleObject: TYPE = RECORD [

drive: DiskChannelBackend.DriveObject,

currentSector: DiskChannel.Sector,

currentCylinder: DiskChannel.Cylinder,

first: DiskChannel.IORequestHandle-- ,

-- previousRequest: DiskChannel.IORequestHandle --];

GetNextPendingRequest: PROCEDURE [schedule: ScheduleHandle] RETURNS [DiskChannel.IORequestHandle];

PeekNextPendingRequest: PROCEDURE [schedule: ScheduleHandle] RETURNS [DiskChannel.IORequestHandle];

InsertRequest: PROCEDURE [req: DiskChannel.IORequestHandle];

END.

LOG

Time: February 2, 1979 4:31 PM By: Horsley Action: Create file

Time: July 24, 1979 3:32 PM By: Gobbel Action: Delete AddressEtc, get Sector, Track, etc., from DiskChannel

Time: August 16, 1979 11:16 PM By: Redell Action: Minor cleanup, incl DriveObject not machine dependent

Time: February 1, 1980 9:06 AM By: McJones Action: Drive=>Schedule, Track=>Cylinder

Time: December 10, 1980 4:07 PM By: Luniewski Action: comment out unneeded fields in ScheduleObject since no more elevator algorithm in DiskDriverShared.