Computer Science Canada

Can't click GUI Buttons if a loop is running - Traffic Light System
Author:  ShifatT [ Thu Feb 28, 2013 5:37 pm ]
Post subject:  Can't click GUI Buttons if a loop is running - Traffic Light System
What I am doing:
I am trying to make a Traffic Light System for class.

Problem :
When a loop is running, I cannot click any buttons until the loop ends.
Eg: If I start Auto-Mode, I cannot click any buttons until the for-loop ends.

What I did:
Remove the loop - Which defeated the purpose of some of the features of the program

Code: Attatched

Turing Version :
4.1.2, 4.0.5 at School.[/u]
Author:  Tony [ Thu Feb 28, 2013 6:35 pm ]
Post subject:  RE:Can\'t click GUI Buttons if a loop is running - Traffic Light System
programs are linear and do one thing at a time. If the program is busy spending time inside of for-loop, it will not get to the code that handles the buttons (or anything else) for a while.

The solution -- don't block on long running loops.
Author:  ShifatT [ Thu Feb 28, 2013 7:58 pm ]
Post subject:  Re: RE:Can\'t click GUI Buttons if a loop is running - Traffic Light System
Tony @ Thu Feb 28, 2013 6:35 pm wrote:
programs are linear and do one thing at a time. If the program is busy spending time inside of for-loop, it will not get to the code that handles the buttons (or anything else) for a while.

The solution -- don't block on long running loops.


So I just leave it as it is?
Author:  Tony [ Thu Feb 28, 2013 9:22 pm ]
Post subject:  RE:Can\'t click GUI Buttons if a loop is running - Traffic Light System
If you understand what's going on and that is acceptable to you.

Basically in a scenario such as
code:

loop
  do_a
end loop

loop
  do_b
end loop


B has to wait for A to completely finish. An alternative is to design your code to be along the lines of
code:

loop
  do_a
  do_b
end loop


This way A and B alternate taking steps, and both get to make some progress, without waiting for the other for too long.

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