Hi Gilles, I spent a few brain cycles on the design of a generic fast-lock via xnsynch. The first thing was defining the lock word and going through its use cases.
You suggested to realize lock stealing directly in user space, but I don't see now how this should work reasonably. Our problem is that we would have to atomically check for the woken state AND compare the current priority against the owner ones. Imaginable only if we replicate the priorities into the lock word - but this makes things at least horribly complicated (e.g. when priorities change). So I think we have to drop this goal. Or what did you have in mind? Jan
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