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SubjectRe: [PATCH][RFC] Lightweight user-level semaphores
> Rusty's idea is nice (though I think it'd be better
> with a filesystem than a device, so you can share
> names rather than file descriptors) but the page per
> lock seems like rather too much overhead.

I don't think its a big problem. A page gets you 256 locks or whatever the
number ends up as. For the case where you have many fine grained locks
between a group of threads thats great. You just parcel them out. If its
two processes just wanting a lock between them, well they get a page with
room for 256 lock objects, but they only want one. That doesn't matter.
Its one page, if they need two or two hundred locks its stil one page.

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