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Sample text

RT CORBA provides primitives to control the dispatching of server threads; it does not provide primitives to use in the application code of CORBA objects themselves. A CORBA server process uses one or more objects called Portable Object Adapters (POAs) (OMG, 1996) to manage the creation/deletion of CORBA objects and the dispatch of threads. A CORBA POA object is constructed with a set of policies specified in the CORBA standard. These policies specify how the POA creates/deletes objects and dispatches threads for the objects that it manages.

Such coordination is necessary to effectively implement distributed scheduling policies. Middleware can provide these distributed coordination capabilities. We have developed a model, design, and middleware implementation of a distributed deadline monotonic priority assignment technique along with a distributed priority ceiling resource access protocol for fixed priority static distributed systems. Most distributed schedul- 41 156 DIPIPPO ET AL. ing techniques, including our technique, assume unique priorities for the tasks in the system.

1999). TAO's strategized scheduling service was configured with an off-line RMS strategy and an 0(1) table lookup at run-time. The dynamic strategy used MUF and therefore required an additional run-time laxity calculation. The high-priority supplier and consumer were paced so that each high-priority operation was dequeued before the next was enqueued. This design remove any queueing effect from the high-priority queue, so its minimum relative overhead could be measured accurately. 30 145 DESIGN AND PERFORMANCE II II "'" t ...

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