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 Robotics / 434
  Re: RCX Programming Questions and Sensor Ideas
 
(...) ...and it would be my sincerest recommendation that you NOT read it, Kekoa. It would be safer from the reverse-engineering standpoint that you NOT use this SDK in any manner. *I* can read it, though <g>, and I can find nothing that indicates a (...) (26 years ago, 10-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) Check and set do not have to be atomic, they have to be ordered. The sequence is: Check all flags, when clear, set our flag, check all flags again, if only ours is set, do stuff. 1. You can dedicate a task to managing semaphores. I described (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) It isn't guaranteed to work, either, though it is likely to in the end. This is because two processes can conspire to always have r31 == 2 when you test for r31 == 1. Cheers, Ben. (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
In message <3648D155.FF4306@alu...ucsc.edu>, Joshua Delahunty <lugnet.robotics@lugnet.com> writes (...) RECEIVED is spelt wrong in the Spirit.OCX software too. :-) I would like to add though that I was impressed with the high quality of the manual. (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) Oops. I don't know how the scheduler in the RCX works. It might execute 1 opcode from each task in order. If 2 tasks get in sync, then they will never leave the semaphore code as written. Here's a fixed version. I added a random backoff. (...) (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) Paul, Are you sure you want to sleep before decrementing r31? As written, r31 is always >= 1 during the sleep -- which prevents any other tasks from obtaining a lock on the resource during this sleep time. In other words, once any two tasks (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) I think "oops" applies in this case. Your fix looks correct. (...) It doesn't have to be random, just each task needs a different delay. This is easy, since each task has to run its own version of the code. For task 3 insert 3 noops, for task (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
 
  Re: RCX Programming Questions and Sensor Ideas
 
(...) Does that support an arbitrary number of tasks? If there are n tasks numbered 1 to n, and task k delays for k cycles on failure, I think you still have to be careful to make sure that the number of tasks n is smaller than the loop overhead h (...) (26 years ago, 11-Nov-98, to lugnet.robotics)

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