[Tinyos-help] Using the Scheduler/SchedulerBasicP

[Philip Levis]

On Aug 4, 2008, at 5:54 PM, Hazem Al- Ojeh wrote:

> Hi Philip,
>
> Thanks for the reply, I did read TEP 106, that is where I thought I  
> can use the
> Scheduler provided instead of writing my own loop. I went through the
> implementation of SchedulerBasicP and I think I understand how it is  
> being used.
>
> I tried following the structure shown in SchedulerBasicP in my own  
> code so I can
> understand how it works and it did work; as in, it did replace  
> everything
> perfectly, and by using pushTask(id) and popTask(), I was able to  
> add and remove
> tasks from the m_tasks[NO_TASK] array.
>
> However, the problem remains in radio communication! I mean I use the
> Scheduler.taskLoop() to loop through all the tasks, and if I send  
> more than one
> task to another node over the radio communication, only the first  
> actually gets
> sent (given that I use a busy flag as shown earlier in the  
> tutorials). If I
> remove the busy flag, then only the last task is being sent. I  
> expected that if
> I make multiple send request through radio communication they would  
> be added to
> a queue and eventually all be sent.
>
> So I am not really sure if I misunderstood TEP 106, or maybe I am  
> having this
> problem because I am trying to run this on TOSSIM. I would really  
> appreciate
> your opinion.

TOSSIM does not model CPU execution time. If you simply cycle through  
tasks, then almost no time will have passed since the first one  
executed.

Phil