The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 1994
Filed:
Feb. 19, 1993
Diane L Knipfer, Rochester, MN (US);
Lynn A McMahon, Rochester, MN (US);
Charlotte B Metzger, Elgin, MN (US);
International Business Machines Corp., Rochester, MN (US);
Abstract
A computer program synchronization instruction is employed to synchronize multiple processing devices sharing main storage through a common interface. The processors execute the synchronization instruction in turn, and all except the final processor are forced into a temporary holdoff condition and execute no further computer program instructions. The final processor to execute the synchronization program becomes a master, releasing itself and the 'slave' devices simultaneously to resume executing instructions. In order to force contentions between processors, a selected delay may be entered into the instruction stream of at least one of the processing devices. The delay can be incremented each time the synchronization instruction is executed, if desired. The forced contentions permit a testing of various serialization mechanisms designed to resolve contentions.