Best way for two Raptors to talk

I have a complex time-sensitive system coordinating a lot of sensors and actuators. A single Raptor is unable able to keep up with the processing of events. I am considering splitting off a complete sub-system of sensors and actuators to a second Raptor. Both Raptors are essentially running a game loop, and will need to communicate state (pass an integer) with every loop in order to stay in sync. Is there a standard way to connect two Raptors and pass this information?