Re: %gs:0 thread pseudoregister in oskit-mach

[Farid Hajji]

Roland McGrath wrote:
> The only time %gs:0 would be changed would be by the pthreads
> implementation when doing a user-level thread switch when using the model
> of n pthreads to m kernel threads.  But if an LIPC context switch happens
> the way I'm guessing (essentially a user-level switch performed by code in
> the KIP) then I imagine that pthreads would want to just use 1-to-1 and
> integrate with the LIPC optimizations.

If I understand this correctly, a pthreads implementation for L4 will
switch user-level threads by doing an explicit LIPC call _instead_ of
modifying %gs:0, right?

This is important to know, so that it can be neatly isolated in
Mach and L4 sysdeps...

-Farid.

-- 
Farid Hajji -- Unix Systems and Network Admin | Phone: +49-2131-67-555
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