class Supervisor:
    def __init__(self):
        self.restarts = 0
        if sys.implementation.name != "circuitpython":
            while True:
                (PARENT, CHILD) = Pipe()
                self.child=CHILD

                FORK = os.fork()

                if FORK == 0:
                    break;

                missed = 0
                n = 0

                while missed < 6:
                    if time.time() > n:
                        print("restart count", self.restarts)
                        n = time.time() + 60
                    if PARENT.poll(10):
                        missed = 0
                        PARENT.recv()
                    else:
                        print("missed checkin", missed)
                        missed = missed + 1
                        
                print("ashes to ashes")
                subprocess.run(["kill", "-9", str(FORK)], check=True)
                self.restarts = self.restarts + 1
    def ping(self):
        if sys.implementation.name != "circuitpython":
            self.child.send("sup")
    def step(self):
        self.ping()