RT-CRM: Real-Time Channel-based Re ective Memory

In this paper, we propose and present Real-Time Channel-based Re ective Memory (RT-CRM) { a useful programming model and middleware communication service for constructing distributed real-time industrial monitoring and control applications on commercially available open systems. RT-CRM provides remote real-time data re ection abstraction using a simple writer-push model. This writer-push approach enables us to easily decouple the QoS characteristics of the writers from that of the readers. This decoupling is crucial in supporting di erent kinds of remote data transfer and access needs that one often nds in distributed industrial systems. We will describe the design of RT-CRM, along with a set of easy-to-use API to access the RT-CRM service. We have implemented RT-CRM as part of a larger real-time middleware project, MidART. We address many of the important implementation issues including bu er management and QoS support. We demonstrate the feasiblity of RT-CRM through a discussion of our application programming support and preliminary performance data.