Java and native threads using libpthread

[Daniel Eischen]

On Sat, 3 May 2003, Scott Long wrote:
> Tom Samplonius wrote:
> > On Fri, 2 May 2003, Daniel Eischen wrote:
> > 
> > 
> >>I know you guys have made a lot of progress with native threading
> >>using libc_r, but I'd like to see you try out libpthread (libkse)
> >>at some point.
> > 
> > 
> >   What kind of implmentation is libpthread?  M:N or 1:1?  freebsd-current
> > has had several lengthy discussion about various competing available,
> > proposed, or planned threading implemenations.  I couldn't determine from
> > the archives what the conclusion was.  I hoping for a summary of what
> > libpthread does now.
> > 
> > ...
> >
> 
> libpthread was recently renamed back to libkse to avoid confusion until
> it is ready for prime-time.  It is M:N.  libthr is 1:1.  Both are not
> ready for prime-time, especially with SMP, but it still might be
> interesting to test them on UP systems.  I tried jdk13 with libthr last
> month and had mixed results.  SwingSet2 ran pretty well, but the
> mozilla plugin didn't.  I haven't tried libkse yet since it deadlocks
> quite quickly in rtld.

I posted a patch to libpthread a couple of days ago that helps
work around this problem; you might want to try that.

I believe the Java implementation relies on libc_r internals,
which aren't the same in libpthread (and perhaps libthr too).
I wouldn't expect copying libthr or libpthread to libc_r
to work for the JVM because of this.  Perhaps this isn't
true anymore, though...

-- 
Dan Eischen