Inner workings of turnstiles and sleepqueues

Ed Schouten ed at
Mon Oct 15 14:13:04 PDT 2007


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

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

 Ed Schouten <ed at>
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