The C++ demonstration is based on the program 'tcdemo', written by Maurizio Martignano at ESTEC to simulate a simple remote computer controlled by tele-commands and returning telemetry data.

The data flow diagram, which is loosely based on MASCOT terminology, is shown in Figure 1. This diagram shows instance of classes with active instances drawn as circles, and passive instances drawn as a large letter "I".

The object 'buffer' is not active. It is a traditional cyclic buffer, and ensures any producing and consuming threads get exclusive access to the buffer's variables by means of a mutex. For the C++ version both the POSIX Threads mutex type and the cond type are expressed as C++ classes. The bodies of the operation are written in line so there is no code size or execution time overhead associated with this extra layer of abstraction.

The output from the telemetry thread is shown in Figure 2.