Subject:
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Re: Two motors at the same time... It is possible?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 19 Feb 2007 02:40:51 GMT
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Viewed:
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13197 times
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In lugnet.robotics.nxt, Johan Strandberg wrote:
> > In this case you have two threads running concurrently which both call
> > into the same subroutine. That's a recipe for disaster. Exactly what
> > will happen when two threads simultaneously call the same subroutine
> > is undefined.
>
> So, maybe a large red label warning saying "threads may not call the
> same subroutine simultaneously"?
Or maybe just wrap the calls inside a mutex, so at least the behaviour is
defined, if not optimum. Many of the NBC/NXC macros do exactly that, maybe all
of them should?
ROSCO
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Message is in Reply To:
 | | Re: Two motors at the same time... It is possible?
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| (...) I understand his confusion. Not allowing separate threads to call the same subroutine is certainly unexpected. The concept of "thread" conventionally involves separate stacks for local variables (and a shared global state -- unlike separate (...) (18 years ago, 19-Feb-07, to lugnet.robotics.nxt)
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