Simple coroutine question

Comments

• sebastiaan

  June 2016 edited 5:49AM

  Hi,

  That's an interesting question. Right now, coroutines has a fixed duration. But what you could do is define your own generator function in an inline_script that

  1. Checks whether a response has been given; and if so
  2. Changes the coroutines duration to 0, triggering an immediate timeout.

  Like so:

  def break_coroutines():
  
      """A generator that breaks a coroutine when a response is given."""
  
      # To start, set response to None
      var.response = None
      yield
      # Loop while coroutines is running
      while True:
          # If a response is given, set the coroutines duration to 0, causing
          # it to stop
          if var.response is not None:
              items['my_coroutines'].var.duration = 0
              break
          # Also break if the coroutines signals that it's over
          keep_going = yield
          if not keep_going:
              break
  

  You'd then add 'break_coroutines' in the 'Generator function name' field of the coroutines plug-in.

  It's a bit of a hack though ... I'll see if I can think of a more elegant way to do this.

  Cheers,
  Sebastiaan

  
  
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• mikaelr

  June 2016 edited 5:49AM

  Hi Sebastiaan,

  Great thank you! I will give it a shot and let you know how it goes.

  Best,
  Mikael
• mikaelr

  June 2016 edited 5:49AM

  Hi Sebastiaan,

  So I am getting a 'zero division error' - float division by zero. It seems like the loop in the inline script isn't working: if I set items['my_coroutines'].var.duration = 1 then I see subsequent trials for 1ms, so the script is not only applying the 'set coroutines duration to 0' to a single trial, but to every subsequent trial.
• sebastiaan

  June 2016 edited 5:49AM

  Ow right! You need to set duration back to its original value before the coroutines is started. To do so, you can add an inline_script immediately before the coroutines plug-in, with the following code in it (either in the Run or Prepare phase):

  # Replace 5000 by the original duration of the coroutines
  items['my_coroutines'].var.duration = 5000
  

  
  
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• mikaelr

  June 2016 edited 5:49AM

  Works great! I placed it in the prepare phase of the main script you passed along - a super useful fix!