Michael Squadrito

Real-time CORBA

This paper describes the requirements for real-time extensions to the CORBA standard, which are being developed by the object management groups special Interest Group on Real-Time CORBA. The paper also surveys efforts that are developing Real-Time CORBA systems. It provides a more detailed description of the dynamic real-time CORBA system being developed at the US Navys NRaD facilities and at the University of Rhode Island.

Expressing and Enforcing Timing Constraints in a DynamicReal-Time CORBA System

Distributed real-time applications have presented the need to extend the Object Management Groups Common Object Request Broker Architecture (CORBA) standard to support real-time. This paper describes a Dynamic Real-Time CORBA system, which supports the expression and enforcement of end-to-end timing constraints as an extension to a commercial CORBA system. The paper also describes performance tests that demonstrate the systems ability to enforce expressed timing constraints.

Concurrency control in real-time object-oriented systems: the affected set priority ceiling protocols

This paper presents the affected set priority ceiling protocols (ASPCP) for concurrency control in real-time object-oriented systems. These protocols are based on a combination of semantic locking and priority ceiling techniques. This paper shows that the ASPCP protocols provide higher potential concurrency for object-oriented systems than existing priority ceiling protocols, while still bounding priority inversion and preventing deadlock.

Object-oriented implementation of an infrastructure and data manager for real-time command and control systems

MITREs Evolvable Real-Time C3 (command, control, and communications) project attempts to develop an approach that would enable current real-time systems to evolve into the systems of the future. The project has chosen AWACS (Airborne Warning and Control System) as an example to test out the concepts and architectures to be developed. In this paper, we describe an object-oriented implementation of an infrastructure and data manager for next-generation real-time command-and-control systems.

A scheduling service for a dynamic real-time CORBA system

Distributed real time applications have presented the need to extend the Object Management Groups (OMG) Common Object Request Broker Architecture (CORBA) standard to support real time. The OMG has formed a real time special interest group (RT SIG) to specify requirements for extending CORBA for real time. One of these requirements involves providing global scheduling of all executions to support end to end timing constraints in the real time CORBA system. The paper describes the design and implementation of a real time scheduling service for a Dynamic Real Time CORBA system.

Adaptable real-time distributed object management for command and control systems

Between now and the early part of the next century, significant portions of todays real-time command, control, and communication (C3) systems will become either functionally inadequate or logistically insupportable. Furthermore, due to the continuing budget reductions, new developments of next generation real-time C3 systems may not be possible. Therefore, current real-time C3 systems need to become easier, faster and less costly to upgrade in capability, and easier to support. What is needed is an approach to evolve current real-time C3 systems into the extensible systems required for the future. This paper describes our Adaptable Real-time Distributed Object Management (ARTDOM) approach for command and control systems. We have constructed a testbed environment and experimented with a Common Object Request Broker Architecture (CORBA) Object Request Broker (ORB). This project is a three year initiative and is expected to be completed at the end of 1999.

Object technology for the integration of the infrastructure, data manager, and tracker for command and control applications

Mitres evolvable real-time C3 (command, control and communications) initiative attempts to develop an approach that would enable current real-time systems to evolve into the systems of the future. Bensley et al. (1996) described the design and proof-of-concept object-oriented implementation of the infrastructure and data manager. In this paper, we describe the object technology-based integration of the real-time software infrastructure, data manager and tracking application.

Evolvable real-time C3 systems-II: real-time infrastructure requirements

MITREs Evolvable Real-Time Command Control, and Communications (C3) project, funded under the Air Force Mission Oriented Investigation and Experimentation (MOIE) program attempts to develop an approach that would enable current real-time systems to evolve into the systems of the future. The project has chosen the Airborne Warning and Control System (AWACS) as an example to test the concepts and architectures to be developed. We discuss the requirements for the infrastructure for next generation complex real-time command and control systems. This discussion also includes an overview of the infrastructure requirements for each of the three architectures that we have considered.