04587609 is referenced by 113 patents and cites 22 patents.

A data processing system having a plurality of units includes a shareable unit which is shareable between two or more of the other units. Lock apparatus is provided in the shareable unit to allow a first unit to lock the shareable unit so that no other unit attempting to lock the shareable unit will be permitted access to the shareable unit. The lock apparatus includes means that permit two units desiring to lock the shareable unit to make simultaneously asynchronous requests to lock the shareable unit. The lock apparatus further includes means to permit the unit which has locked the shareable unit to unlock the shareable unit so that it becomes available for a subsequent lock by a unit. The lock apparatus also includes means to allow the shared unit to be accessed by other units not attempting to lock the shareable unit even when the shareable unit is locked.

Title
Lockout operation among asynchronous accessers of a shared computer system resource
Application Number
6/510472
Publication Number
4587609
Application Date
July 1, 1983
Publication Date
May 6, 1986
Inventor
Edward R Salas
Billerica
MA, US
James M Sandini
Berlin
MA, US
Daniel A Boudreau
Billerica
MA, US
Agent
John S Solakian
George Grayson
William A Linnell
Assignee
Honeywell Information Systems
MA, US
IPC
G06F 9/46
G06F 13/14
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