Re: [Gems-users] MessageBuffer

["Lei Yang" <lya755@xxxxxxxxxxxxxxxxxxxx>]

Mike, Thanks a lot for you reply. I checked in protocols and did a grep on 
"triggerQueue". There are a lot of them and I looked into 
MOESI_CMP_directory-L2cache.sm. There I found that triggerqueue is used in a 
similar way that I did. First you define MessageBuffer like this:
MessageBuffer triggerQueue, ordered="true";

Then define out_port and in_port:

out_port(triggerQueue_out, TriggerMsg, triggerQueue);

in_port(triggerQueue_in, TriggerMsg, triggerQueue) {
   if (triggerQueue_in.isReady()) {
     peek(triggerQueue_in, TriggerMsg) {
       if (in_msg.Type == TriggerType:ALL_ACKS) {
         trigger(Event:All_Acks, in_msg.Address);
       } else {
         error("Unexpected message");
       }
     }
   }
 }

Then in some actions, you enqueue to triggerQueue_out. And in some 
transitions you call the action n_popTriggerQueue to dequeue triggerQueue_in 
(and what does this mean?). I have two questions:
1. I changed my code and replaced RequestMsg and ResponseMsg of my in_port 
and out_port associated with my local MessageBuffer to TriggerMsg. But when 
I tried to compile, I got this error:
../protocols/MSI_MOSI_CMP_directory-L2cache.sm:539: Error: Type 'TriggerMsg' 
not declared.
However I grepped in MOESI_CMP_directory-L2cache.sm and didn't see 
TriggerMsg declared either. I thought this is a built in Slicc class. How do 
I fix this?
2. What is the difference of my approach and the triggerQueue approach? I 
want to fully understand how two ports communicate with one MessageBuffer.
I'm sorry for asking so many questions in this email. I really appreciate 
your help!
Thanks in advance,
Lei
----- Original Message ----- 
From: "Mike Marty" <mikem@xxxxxxxxxxx>
To: "Lei Yang" <lya755@xxxxxxxxxxxxxxxxxxxx>; "Gems Users" 
<gems-users@xxxxxxxxxxx>
Sent: Monday, November 06, 2006 11:41 AM
Subject: Re: [Gems-users] MessageBuffer


> Grep for "triggerQueue" in the protocols directory.  There are many
> examples of using a MessageBuffer in this way.
>
> --Mike
>
>
> > Does anybody know how to use MessageBuffer the way I described? I did a
> > search on the list archive and couldn't find anything close. I think the
> > GEMS author might know how to do it.  I'm stuck on this and really
> > appreciate your comments!
> >
> > Thanks in advance.
> > Lei
> > ----- Original Message -----
> > From: <lya755@xxxxxxxxxxxxxxxxxxxx>
> > To: <Gems-users@xxxxxxxxxxx>
> > Sent: Monday, November 06, 2006 1:42 AM
> > Subject: [Gems-users] MessageBuffer
> >
> >
> > > Dear list,
> > >
> > > I have a question regarding the use of MessageBuffer. I am using
> > > MSI_MOSI_CMP_directory protocol. I want to create a MessageBuffer that
> > > connects an in_port and an out_port, both belong to the
> > > L2Cache_Controller.
> > > Basically the L2 controller sends message to the out_port and the 
> > > in_port
> > > just
> > > process each message in FIFO order. No data needs to go in or out of 
> > > the
> > > L2
> > > cache.
> > >
> > > Right now I defined the following in my 
> > > MSI_MOSI_CMP_directory-L2cache.sm
> > > file:
> > >
> > > MessageBuffer LocalL2Request, ordered="true";
> > >
> > > out_port(LocalL2Request_out, RequestMsg, LocalL2Request);
> > >
> > > in_port(LocalL2Request_in, RequestMsg, LocalL2Request) {
> > >  if(LocalL2Request_in.isReady()) {
> > >    peek(LocalL2Request_in, RequestMsg) {
> > >      // Do something;
> > >    }
> > >  }
> > > }
> > >
> > > However it seems that the two ports are not "connected" even if they 
> > > share
> > > the
> > > same MessageBuffer. The simulator goes to an infinite loop when I send
> > > requests to the out_port, which implies that those requests were never
> > > processed by the in_port.
> > >
> > > Please help!!
> > >
> > > Thanks a lot!
> > > Lei
> > >
> > >
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