[Tinyos-help] Detecting one event in another event

[ram kishore]

Hi,
      The problem is exactly like this:
""When the message is send,send.done() event is generated.I start waiting
for a packet to be received.If it doesn't come in 1ms,I will re-transmit
else I will transmit the next packet.""

*Coding part:*
  In send.done ()
  {
             while ( timer <= 1000)
         {
              TOSH_uwait(1);  //wait for 1microsecond
                timer++;
               if ( flag == 1)     //flag is a conditional variable;If
packet is received,Receive.receive() event will set the flag to 1.
               {
                call Leds.yellowToggle();
               break;
               }
         }
if  ( timer == 1001)
post ResendTask();
        return SUCCESS;

  }


I will transmit the next packet in receive.receive event.
Conditional variable is not working in this regard.Any suggestion on
different paradigm ?

Regards,
Kishore

On Wed, Jul 30, 2008 at 11:54 PM, Eric Decker <cire831 at gmail.com> wrote:
>
>
> On Wed, Jul 30, 2008 at 10:55 AM, ram kishore <rapoliit at gmail.com> wrote:
>>
>> Hi all,
>>
>> When ever a packet is received, an event ReceiveMsg.receive(TOS_MsgPtr
>> Msg) is generated.Can I detect this in some other event for example in
>> send.senddone() event,so that I can perform alternative task.How to
>> detect it?
>
> First I'm not sure what problem you are trying to solve.  The description
> you
> give above sounds complicated.  If I understand correctly from the event
> handler for send.senddone you want to check to see if a message was
> received and do something else.  Is that correct?  If so it seems simpler
> to let the different handlers handler their one thing.  Just an aside.
> events are signaled from  another module and as such are pieces of static
> code.  As such there isn't a way to detect an event in another event.
> That said your alternative sounds like it might work but it depends on
what
> kind of events, async or not, are being used.  And as soon as you start
> mixing
> async stuff and wanting it to interact with a task level event things get
> complicated
> quickly.
> eric
>>
>> An alternative to this may be using conditional variables.I declare a
>> global variable "flag" as "false".Keep performing some task in
>> senddone() event.when a packet is received,receive event generated
>> will set the flag as "true", then I will stop doing task in senddone()
>> event.Will this work?
>>
>>
>> Best Regards,
>> Kishore
>> _______________________________________________
>> Tinyos-help mailing list
>> Tinyos-help at millennium.berkeley.edu
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
>
>
> --
> Eric B. Decker
> Senior (over 50 :-) Researcher
> Autonomous Systems Lab
> Jack Baskin School of Engineering
> UCSC
>
>
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