if i just turn on multi-threading and do not synchronize the EOF calls, then if two or more requests came in for EOF related operations they would choke? [is what i understand]
if you're making ajax calls that (as I understood it from your original) are NOT touching eof, you're not going to lock against EOF ... they're just unrelated method calls. if you have two direct actions touching EOF, then yes, if you are .lock()ing properly, they will become single-threaded at one of the layers of EOF.
But he'll be locking against the session, which may even be worse.
not sure how this would be worse? if he's doing a bunch of ajax stuff, it implies to me that the user is sitting on a single page, so I guess if you have two sessionful Ajax things polling against eachother you'd see that ... that said, I actually assumed that he was using sessionless DA's here (just figuring most people would use Ajax framework if they were doing sessionful things), but in hindsight that's maybe too great of an assumption.

also, i feel the need to say "he lives" every time you poke your head up from whatever world you're living in now :)

ms

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