From owner-freebsd-hackers@FreeBSD.ORG  Fri May 23 23:35:43 2003
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Date: Sat, 24 May 2003 02:35:31 -0400 (EDT)
From: Daniel Eischen <eischen@pcnet1.pcnet.com>
To: Terry Lambert <tlambert2@mindspring.com>
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cc: freebsd-hackers@freebsd.org
cc: Dan Nelson <dnelson@allantgroup.com>
cc: Julian Elischer <julian@elischer.org>
Subject: Re: libkse and SMP (was Re: USB bulk read & pthreads)
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On Fri, 23 May 2003, Terry Lambert wrote:

> Daniel Eischen wrote:
> > On Fri, 23 May 2003, Terry Lambert wrote:
> > > This is handy to know; so basically, my expectation from
> > > reading the code around PTHREAD_SCOPE_SYSTEM was correct:
> > > a single CPU system with PTHREAD_SCOPE_PROCESS (the default)
> > > can still get itself blocked in the kernel by a single
> > > blocking call (as in the USB bulk read device issue).
> > 
> > If I am reading you correctly, then no.  Scope process
> > threads will block in the kernel, but upcalls will be
> > made to the originating KSE and new threads will be
> > scheduled.
> 
> I'm rereading it, but I don't see that interpretation.
> 
> I guess if both you and Julian both called me on it, I must
> have misexpressed myself, but I currently don't understand
> how.  8-|.

I think it was the part about "a single CPU system with
PTHREAD_SCOPE_PROCESS (the default) can still get itself
blocked in the kernel by a single blocking call" without
mentioning that it won't block other scope process
threads from being run.

-- 
Dan Eischen