On Tue, Sep 26, 2006 at 04:44:53PM -0700, Allison Randal wrote: > I've committed an updated I/O PDD. I'm close to pronouncing this ready > to implement, so get in your comments now. > > One piece that is currently missing is a discussion of which lightweight > concurrency model we're going to use for the asynchronous operations. > I've had ongoing back-channel conversations with various people, but I > need to congeal them. Pitch in your own 2 cents. > > Also, any reactions to the distinction that async ops return status > objects while sync ops return integer error codes? Sync opcodes could > have 2 signatures, one with an integer return type (int error code) and > one with a PMC return type (status object).
What's the relative cost of creating a PMC vs passing one in? I assume passing one in is significantly faster. If so, then perhaps speed-sensitive ops that are likely to be used in loops can be given the PMC to (re)use. Tim.
