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An example myhdl sim showing two sims running concurrently in different threads with no problem. In such an example, it is necessary to have separate signals, otherwise they *will* step on each other.
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| from myhdl import * | |
| import threading | |
| a = Signal(intbv(0)[5:]) | |
| b = Signal(intbv(0)[5:]) | |
| clock1 = Signal(False) | |
| clock2 = Signal(False) | |
| reset1 = ResetSignal(False, active=True, async=False) | |
| reset2 = ResetSignal(False, active=True, async=False) | |
| lock = threading.Lock() | |
| def clockgen(clock): | |
| @instance | |
| def clkgen(): | |
| while True: | |
| yield delay(10) | |
| clock.next = not clock | |
| return clkgen | |
| def stimulus(sig, clock, reset): | |
| data = [0] | |
| @always(clock.posedge, reset) | |
| def stimulus_inst(): | |
| sig.next = data[0] | |
| data[0] += 1 | |
| return stimulus_inst | |
| def printer(sig, clock, reset): | |
| @always_seq(clock.posedge, reset) | |
| def printer_inst(): | |
| with lock: | |
| print threading.current_thread(), now(), sig | |
| return printer_inst | |
| sim1 = Simulation([clockgen(clock1), stimulus(a, clock1, reset1), | |
| printer(a, clock1, reset1)]) | |
| sim2 = Simulation([clockgen(clock2), stimulus(b, clock2, reset2), | |
| printer(b, clock2, reset2)]) | |
| sim1_thread = threading.Thread(target=sim1.run, args=(200,)) | |
| sim2_thread = threading.Thread(target=sim2.run, args=(300,)) | |
| sim1_thread.start() | |
| sim2_thread.start() | |
| sim1_thread.join() | |
| sim2_thread.join() |
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The output from the above is something like:
myhdl 0.9 will just run forever.