RE: [sv-bc] function task calling

If the call is to a class virtual task, it is very complicate
to check all possible implementations of the task.  

> -----Original Message-----
> From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On 
> Behalf Of Maidment, Matthew R
> Sent: Saturday, September 08, 2007 11:25 AM
> To: Brad Pierce; sv-bc@eda-stds.org
> Subject: RE: [sv-bc] function task calling
> 
> Does this imply traversing any potential call stack to 
> identify those tasks that have statements that are illegal in 
> a function?
> I think this is impractical.
> 
> --
> Matt Maidment
> mmaidmen@ichips.intel.com
>   
> 
> >-----Original Message-----
> >From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of 
> >Brad Pierce
> >Sent: Saturday, September 08, 2007 11:21 AM
> >To: sv-bc@eda-stds.org
> >Subject: RE: [sv-bc] function task calling
> >
> >Rather than a blanket prohibition on task enables in function 
> >definitions, should the prohibition in 13.4.b be weakened to only 
> >disallow enables of tasks with statements that would be illegal in a 
> >function?
> >
> >-- Brad
> >
> >-----Original Message-----
> >From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of 
> >Steven Sharp
> >Sent: Friday, September 07, 2007 11:28 AM
> >To: sv-bc@eda-stds.org; shalom.bresticker@intel.com
> >Subject: Re: [sv-bc] function task calling
> >
> >
> >>Since functions are not allowed to call tasks, how can a function 
> >>contain a call to $display?
> >
> >Functions are not allowed to delay.  Functions are not 
> allowed to call 
> >tasks because a task could delay, indirectly delaying the function.
> >
> >System tasks cannot delay, so there is no problem with allowing 
> >functions to call them.  In SV terms, all system tasks are 
> essentially 
> >void functions.
> >
> >
> >>What types of built-in system tasks are functions allowed to call?
> >
> >I am not aware of any built-in system task that can delay, 
> so I don't 
> >think there is any restriction.  I don't think there is a way for a 
> >user-defined system task to delay either, so I don't think 
> there is any 
> >need for a restriction there either.
> >
> >I think this restriction is a case where "task" means 
> "task", not "task 
> >or system task."
> >
> >Steven Sharp
> >sharp@cadence.com
> >
> >
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