Inner workings of turnstiles and sleepqueues

Kris Kennaway kris at
Tue Oct 16 02:07:17 PDT 2007

Ed Schouten wrote:
> Hello,
> For some reason, I want to understand how the queueing of blocked
> threads in the kernel works when waiting for a lock, which is if I
> understand correctly done by the turnstiles and sleepqueues. I'm the
> proud owner of The Design and Implementation of the FreeBSD Operating
> System book, but for some reason, I can't find anything about it in the
> book.
> Is there a way to obtain information about how they work? I already read
> the source somewhat, but that shouldn't be an ideal solution, in my
> opinion.
> Yours,

I think this is a question to ask on hackers@


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