Translating the CDL input to a SPIN program:

The local variable ready_to_produce becomes global (global_ready_to_produce_0).
The local variable ready_to_deliver becomes global (global_ready_to_deliver_0).
The local variable buffer_filled becomes global (global_buffer_filled_0).
The local variable buffer_empty becomes global (global_buffer_empty_0).
The local variable ready_to_remove becomes global (global_ready_to_remove_0).
The local variable ready_to_consume becomes global (global_ready_to_consume_0).