PropBasic - example code using locks?

pmrobert · 2012-10-16 14:24

I have finally given in and am asking for example PropBasic code showing use of locks between tasks. I've tried pretty much every permutation of code I could envision - to no avail. I've searched and the only clue I was able to find is that it works just like in Spini. All well and good, but the way it works in Spin seems to utilize globally visible hub variables - which do not directly exist in PropBasic. I've tried rdlong/wrlong conversions, etc., but still no go. Even a clue would be very welcome!

-Mike

VonSzarvas · 2012-10-16 23:52

Locks do work with PropBasic. Here is a snippet from a generic debug library I use:

' Wait for lock
      DO
          LOCKSET 0, __param1
       LOOP UNTIL __param1 = 0

' Do something that needs to be done exclusively (ie. whilst locked!)...


' Release lock
      LOCKCLR 0

The __param1 usage here is just as a temporary variable. It could have been any unused variable.

If you check the Propeller manual you can find how LOCKSET works, and then this should make sense. I suspect the PropBASIC manual and/or instruction-reference guide/s might also mention LOCKSET.. might be worth a look there too.

If you are still unsure after checking the guides, feel free to reply and I will try to provide a more complete explanation or example.

Good luck!

VonSzarvas · 2012-10-16 23:56

.. You can find the latest PropBasic guides included in the zip file posted by Bean at this thread:

http://forums.parallax.com/showthread.php?143050-PropBASIC-status&p=1134491&viewfull=1#post1134491

The manual describes LOCKSET on page 56!

pmrobert · 2012-10-17 05:42

Thanks so very much! I did examine the literature, I just could not fully comprehend the concept. Now it's all crystal clear.

-Mike

PropBasic - example code using locks?

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