[Click] Spinlock question

[Eddie Kohler]

Michael Walfish wrote:
> Eddie wrote:
> | It might make sense for Click to guarantee mutual exclusion between
> | threads and write handlers.  Would this help you in any way?
> 
> I think so. If I've understood you, then this mutual exclusion would
> prevent me from having to worry about whether a packet processing event
> that's reading a data structure is in fact getting a coherent version of
> the data structure (since a write handler might be mucking with the data
> structure at the same time the packet processing code needs to read the
> data structure).
> 
> Thanks!
> 
> -Mike

Yes, that's right.  You'd still have to worry about _read_ handlers (if the read 
handler changed something, or accessed pointer data that the Click thread might 
alter), but that's generally less of a problem.

E