Have the parent execute something while waiting for child

Question

I am trying to have two things execute at the same time. I have some code to run a PWM module, and I have some code to read from an ADC and both work. I want to now read from the ADC while waiting for the pwm module to finish. I thought of forking, but wasn't sure how to get the parent to wait for the child to finish.

I'd like to have something like the following:

pid = os.fork()
if(pid > 0):
     while(child not done):
         adc code 
else:
    pwm code

Answer 1

Using multiprocessing I was able to do it.

pwm_p = Process(target=my_pwm, args=(my_args,))
pmw_p.start()
while(pwm_p.is_alive()):
    read_from_adc()

Answer 2

You can use os.wait() from the parent process to wait for the child to terminate. You can find an example of this here .