seanhalle@0: 
seanhalle@0: This test app is for VReo development..  first version replicates a program
seanhalle@0: from the paper.  It has two producers and one consumer.  The circuit causes
seanhalle@0: the producers to take turns providing the next input that the consumer takes.
seanhalle@0: 
seanhalle@0: The circuit is in the paper..
seanhalle@0: 
seanhalle@0: The way the code works, the circuit is supplied separately.  A function is
seanhalle@0: generated by a tool, which creates the circuit data structs.  Those structs
seanhalle@0: contain pointers to the functions that check transitions and then perform
seanhalle@0: transitions.
seanhalle@0: 
seanhalle@0: So, the seed first starts up VReo, then it calls the create circuit Fn,
seanhalle@0: which returns a pointer to the circuit, then it calls create_VP three
seanhalle@0: times.  The first, it hands it the pointer to the producer Fn, along with
seanhalle@0: a pointer to the circuit and an integer that indicates that it connects to
seanhalle@0: port 1 of the circuit.  Second, it creates another producer, but connected
seanhalle@0: to port 2, then it creates a consumer connected to port 3.
seanhalle@0: 
seanhalle@0: Then, it waits for the computation to end.
seanhalle@0: 
seanhalle@0: A producer puts out 5 items, doing a print for each.  The consumer consumes
seanhalle@0: 10 items, doing a print for each.
seanhalle@0: 
seanhalle@0: Then each of them call "end_VP".
seanhalle@0: 
seanhalle@0: That ends the computation, and the seed comes back, and calls "end_seed_VP"
seanhalle@0: 
seanhalle@0: