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Virtual-software-machine-for-enabling-CICS-application-software-to-run-on-UNIX-based-computer-systems

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Details

Inventors: Talati, Kiritkumar; Lackie, C. Willard;
Assignee: BEA Systems, Inc. (San Jose, CA)
Primary Examiner: Treat; William M.
Assistant Examiner:
Attorney, Agent or Firm: Fliesler, Dubb, Meyer & Lovejoy LLP

The present invention relates to a virtual software machine for providing a virtual execution environment in a target computer for an application software program having one or more execution dependencies that are incompatible with a software execution environment on the target computer. The machine comprises a plurality of independent processes, and a virtual control mechanism having a virtual management interface (VMI) for generating requests for execution to the plurality of independent processes and receiving results of such processing. The requests for execution and the results are communicated via a message exchange mechanism. The machine also includes a pre-processor for generating a pre-processed application program in which the execution dependencies are masked. A compiler/linker receives the pre-processed application program and the virtual control mechanism and generates executable code for the operating system of the target computer. A run-time module of the machine is run by the operating system of the target computer for executing the application software program in the target computer despite the execution dependency that is incompatible with the target computer system software execution environment.

DETAILED DESCRIPTION It is an object of the present invention to provide an architecture for porting application software, normally compatible with a "source" computer, to a heterogenous or "target" computer.
It is still another object to create a "virtual" interface architecture which enables heterogenous machines to mask the differences in their hardware and software by isolating the application software from the processing environment.
It is another object of the invention to provide application program portability and consistency across a number of different office automation, transaction processing and non-procedural language-based system architectures.
It is yet a further object of the present invention to enable an existing application program to function as a direct link to the hardware and operating system of a diverse computer system without a transaction processing system.
It is another object of the present invention to provide a method and apparatus which facilitates the functional interconnection of programs written in procedural programming languages (such as "C", "COBOL" or "ADA"), or the interconnection of a program written in a procedural programming language with a program written in a non-procedural programming language (such as "LISP" or "PROLOG").
It is a further object of the present invention to allow the development of application programs on micro or minicomputers for migration to mainframe computers and vice versa.
As a byproduct, the present invention allows existing mainframe transaction processing system applications to run on micro or mini-computers without modifications or programming changes.
It is still another object to provide a virtual interface system which will enable the migration of existing applications to new and more advanced hardware environments created in the future.
According to the preferred embodiment of the invention, a virtual interface system for porting application software to a heterogenous or "target" computer comprises a plurality of independent interface processes for running in one or more distributed processors of the target computer

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