[Tinyos-help] A question on TinyOS scheduling

[Michael Schippling]

If an event handler has preempted a task then it is probably
the result of an interrupt and is running in that interrupt's
context. As has been covered in previous posts, a second interrupt
may preempt if the first handler re-enables them.
I think the UART code is an example.

So the bottom line is: probably...

I don't believe that there is any specific module for
event scheduling as it is spread through all the interrupt
behavior settings for various bits of hardware. A close reading
of the controller's interrupt manual sections and the relevant
TOS code is about the best you can do.

MS

Bin Lei wrote:
> Dear All
> 
> Here's a question about scheduling of TinyOS:
> Event handler can preempt CPU from task, that's definite,
> but how about an event handler preempt another event handler?
> E.g. handler1 has 3 steps 11,12,13 while handler2 has 3 steps 21,22,23 
> respectively.
> Handler 1 execute first and goest to 11, 12, while suddenly handler2 is 
> triggered by an interrupt?
> What happens? from my understanding it should be: 11, 12, _21, 22, 23_, 13
> Is that true?
> 
> b.t.w., which module of tinyos core implement the scheduling algorithm 
> for event handlers?
>  
> Many thanks.
> 
> -- 
> Regards,
> Benjamin (Bin) Lei (雷斌)
> Department of Computer Science and Technology, Nanjing University
> Tel: 8625-83594683  
> Cell: 86-13813909880      
> Addr.: Room 508, Mengmingwei Bldg, Nanjing Univeristy, Nanjing, P.R.C.210093
> E-mail : leibin.nju at gmail.com <mailto:leibin.nju at gmail.com>
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Tinyos-help mailing list
> Tinyos-help at Millennium.Berkeley.EDU
> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help