[Tinyos-devel] ENOMEM in TinyError.h

[Philip Levis]

On May 6, 2008, at 9:08 AM, Matt Welsh wrote:
> Anything that does dynamic resource allocation. There are various  
> implementations of dynamic memory management for TinyOS where this  
> would be useful. TinyOS might have a policy of static allocation  
> for most things, but there are plenty of situations -- memory pool  
> management, thread creation, packet queues, energy scheduling --  
> where an ENORESOURCE would be useful. I think it makes sense to at  
> least have an error code that represents the case of a dynamic  
> resource allocation request was denied.

OK. There's a tradeoff between just queueing the request until the  
resource is available and returning a failure code. For "now or  
never" sorts of operations, the latter is simpler than an x/cancel/ 
xDone(ECANCEL) exchange. Adding an ENORESOURCE is no big deal, but  
moving towards runtime failures being common in the core (i.e.,  
having many interfaces that return ENORESOURCE) would be.

Phil