threading SoundOut/Wait and TextDisplay objects

[David McFarlane]

Becky,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
takes any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours -- this is pretty 
much their substitute for proper documentation, so make full use of 
it.  3) If you do get an answer from PST Web Support, please extend 
the courtesy of posting their reply back here for the sake of others.

That said, here is my take...

Offhand, I do not think that E-Prime natively supports multiple 
"threads" such as you would like for this task, but I hope somebody 
else chimes in and tells me that I am wrong.

Again offhand, I think you could accomplish your end by implementing 
your own "event loop" directly in E-Basic code.  Do a search on that 
term to see where I have mentioned this before, although I don't 
think I have ever gone into much detail.  Wikipedia might have a 
better discussion of the topic in general.  In your case your event 
loop would handle both timeout for your TextDisplay, and responses.

-- David McFarlane, Professional Faultfinder


>Can anyone tell me how to set up multiple threads in E-Prime?  I need
>separate threads for running SoundOut/Wait objects and a TextDisplay
>object.  I'm creating a task which presents a continous loop of the
>following:
>
>-SoundOut1
>-Wait1
>-SoundOut2
>-Wait2
>
>The subject adjusts the timing of Wait1 and Wait2 using key responses,
>and the loop (trial) ends when the subject presses Enter.  I'm using
>InLine scripts after each sound/wait object to check for any response
>and adjust the next wait timing accordingly.
>
>The problem is that I'm also presenting a TextDisplay with background/
>default text, and I want to change this text display (to provide
>visual feedback) for 200 ms after a response, then have theTextDisplay
>return to the default text.  I can change the TextDisplay after any
>response, but if I tell E-Prime to wait 200ms, then change the text
>again, it introduces a 200ms delay in my contionous audio/wait loop.
>The timing delay problem is resolved if I just set the TextDisplay
>object to "clear after = No", but then the response feedback display
>text is held on screen until the next response, which is
>problematic.
>
>Any thoughts and suggestions are much appreciated!
>
>Becky
>
>p.s. Apologies if this has been addressed in E-Prime support/forums
>already - I've searched for related topics but couldn't find a
>solution.

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