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[solved] Using thread

edited July 2012 in OpenSesame

Hi Sebastian.

I have a problem with this code that uses thread to produce a windows beep. I run OpenSesame from source, in order to avoid modules problems, but the problem is the same, irrespective of the installation.

import thread import winsound def windowsBeep(): lock = thread.allocate_lock() lock.acquire() winsound.Beep(1000, 100) lock.release() # ... # ... # subsequently, in a part of the code... thread.start_new_thread(windowsBeep,()) # produce a beep


The debug window doesn't return any error, simply the beep doesn't start. However, the cmd window returns this error:

Unhandles exception in thread started by Traceback (most recent call last): file "(string)", line 44, in windowsBeep NameError: global name 'thread' is not defined


I noticed that, inside OpenSesame, you have to define global variables if you want to use them inside a function. Is the problem due to this aspect?

PS. If I use the winsound command, without the thread, the beep starts, but it doesn't works in as I would want, so the thread is important for me.

Do you have any suggestion?

Thanks,

Andrea

Comments

  • edited 4:33AM

    Hi Andrea,

    Yes, this is because what you're really doing is defining a function within a function, because the script is in itself already the body of a function. So in practice your script would look like this:

    def run()
        import thread
        import winsound
        def windowsBeep():
            lock = thread.allocate_lock()
            lock.acquire()
            winsound.Beep(1000, 100)
            lock.release()
    

    Does that make sense? It's not very intuitive, I know.

    Because of this structure it gets a bit awkward when you're defining functions, having to make variables global and re-importing modules in each function.

    So the solution would be to add the import statement also to the function. Or you could use the external_script plug-in, in which case you can use a Python script with real functions etc (see plug-in documentation).

    Cheers!
    Sebastiaan

  • edited 4:33AM

    Many many thanks, Sebastian. This solves the problem. :)

    Best,

    Andrea

  • edited 4:33AM

    Related to the use of functions in OpenSesame, if I want to define a function that I have to repeatedly use in (say) four different inline scripts, how can I write that function only one time at the begin of the experiment, making it callable in the various scripts?

  • edited 4:33AM

    Good question!

    Quite amazingly, you can treat functions pretty much like variables in Python. So you could make a function globally available either by adding as a property to the experiment object, or by making it global. Both methods are identical to what you could do with a variable.

    Define your functions in one inline_script:

    # Method 1: Add function as property to experiment
    def func1():
        print "I'm a property!"
    exp.func1 = func1
    
    # Method 2: Make function global
    global func2
    def func2():
        print "I'm global!"

    Use them in another inline_script:

    exp.func1()
    func2()
  • edited 4:33AM

    Perfect! I think that defining variables and functions as global is more easy, at least when one has to use a lot of objects.

    Thanks again.

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