[Click] Spinlock question

[Eddie Kohler]

Dear myself from more than 2 years ago,

If you declare a write handler with the Handler::EXCLUSIVE flag -- 
either via Element::set_handler(), or with Element::set_handler_flags() 
-- then Click will guarantee mutual exclusion between Click threads and 
the handler.

Thomas, perhaps this will help you?

Eddie


Eddie Kohler wrote:
> 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
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