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From: "M. Warner Losh" <imp@bsdimp.com>
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Subject: Re: cvs commit: src/sys/dev/fdc fdc.c fdcvar.h
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In message: <200409232135.31918.jhb@FreeBSD.org>
            John Baldwin <jhb@FreeBSD.org> writes:
: What about someone else's interrupt preempting you?

Do others sleep on the thread pointer?  Are there other wakeups in the
system that could wake up the msleep than in the exit1() code?

Warner