FreeBSD Threading Documentation

[Olaf Wagner]

On Sun, Feb 10, 2008 at 07:13:25PM -0800, Alfred Perlstein wrote:
> * Olaf Wagner <wagner at luthien.in-berlin.de> [080210 18:37] wrote:
> > I haven't found much, so I think I'll have to ask here after all:
> > 
> > Is there any overview article or design document about the
> > different threading implementations in FreeBSD?
> 
> There have been a few approaches taken over the years,
> an N-1(libc_r), N-M(libkse) and N-N (libthr).
> 
> Currently FreeBSD supports pthreads using libthr which
> is pretty much the same way that Solaris and Linux support
> pthreads.

That's about how much I had already figured out :-)
I am looking for something a little bit longer (let's
say about 5-12 pages) which discusses the design and compares 
two or more of the solutions. Or is the source code the
only available documentation?

The FreeBSD documentation project has amassed such a wealth
of information, but I couldn't find anything related to threads,
which does not seem a very uncommon topic to me.

The reason because I'm asking is that I've started to use
FreeBSD's system threading libraries for CM3 instead of the
built-in user threads system, and there are several interesting
effects (hangs, assertion failures, ...) with one or the other
of the libraries, which may either be located in M3 or in C
code.

Olaf
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