Browse Prior Art Database

Conditional High Priority Break-In Contention

IP.com Disclosure Number: IPCOM000066934D
Original Publication Date: 1979-May-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Bhatia, HS Meifert, KA Ryan, TF Smith, VA Walters, RT [+details]

Abstract

Multiple input/output channels of a data processing system may operate on a time-shared basis through a common microprocessor. In such systems a channel requiring execution of an associated function (e.g., command retrieval and data transfer) presents a "break-in" request of predetermined priority ranking to the shared control subsystem. If the priority of such a request outranks the priorities of other requests which may be simultaneously active, and if the function currently being performed by the control microprocessor is susceptible to interruption, the processor is interrupted to perform the associated function (either in part or completely).