Hard real-time Linux variants, RTLinux and RTAI, both use fifos and shared memory to communicate with user applications. In this work, we describe a new package, lvrtl, which allows LabVIEW VIs to use these mechanisms in a completely generic way. For the get operations, the incoming data is collected into a dynamically resized array thus handling scalar and array data for several different data types. There are symmetric put operations and a complete suite of VIs with which to build LabVIEW applications. The package also includes extensive test code under RTLinux 2.2 and RTAI 1.3.

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