International Business Machines Corporation

John R Disbrow

Everett T Eiselen

David T Wang

Stephen Gouze Luning

James Garman Belleson

Gerald I Findley

Processors communicatively attaching a storage sub-system and which place a message on a queue no longer have to wait on a queue lock set by another processor or sub-system dequeuing a message. This is realized by use of a double ended linked list or queue of messages having an isolation/reference point wherein an enqueuing end of the list is lockable and accessible independently from the dequeuing end of the list. The locking primitive may be of the multi-processor lock synchronizing atomic type such as TEST AND SET.

Message queue processing among cooperative processors having significant

Page modification method in a printer subsystem of the partial page

A raster printer with sufficient flexibility so that text data and image data of any size and orientation can be placed at any position on a page. Input data has a succession of coded character data along with control data which specifies information concerning font selection and the placement of the characters on the page. Control circuits process the input data, one character at a time, and generate for each of the characters, data relating to the position of the character on the page, the size of the character and the address in storage of the graphic pattern for the character. The data is utilized by pattern move control logic to access the graphic pattern in the order the characters are to be printed and move the graphic data to a strip buffer. Data is read out of the strip buffer to energize imaging apparatus to print a page corresponding to the graphic pattern of the character data. An accumulator provides temporary storage for parts of the graphic pattern data and this data is logically ORed with later data so that a page of unlimited complexity can be printed.

Flexible text and image generator for a raster printer

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Los Gatos, CA, United States of America

John R Disbrow