System for providing data communication between a computer terminal and a plurality of concurrent processes running on a multiple process computer

  • US 4,761,642 A
  • Filed: 10/04/1985
  • Issued: 08/02/1988
  • Est. Priority Date: 10/04/1985
  • Status: Expired due to Term
First Claim
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1. In a computer system having a memory and having processing means for concurrently executing multiple processes, including first processes, each of which first processes receives input data produced by a computer terminal of said computer system and produces output data for controlling display on a screen of said computer terminal, a method for permitting concurrent data communication between a plurality of said first processes and a single computer terminal, the method comprising the steps of:

  • initiating and concurrently executing for each of said first processes a corresponding virtual terminal process each virtual terminal process receiving input data from the single computer terminal and forwarding said input data to the corresponding first process, receiving output data produced by the corresponding first process, and maintaining a separate display list in said memory, said display list comprising data defining a display in accordance with said output data produced by the corresponding first process;

    initiating and executing a screen process for maintaining a subrectangle list in said memory, said subrectangle list comprising a set of instructions defining positions and sizes of display windows to be displayed on a screen of said single computer terminal, each window corresponding with a separate display list; and

    initiating and executing a display list process for periodically transmitting display data to said single computer terminal for causing said single computer terminal to concurrently display said display windows on said screen at positions and of sizes defined by said subrectangle list, each window including a display in accordance with the display defined by the corresponding subrectangle list.

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