Re: Remove SunOS LWP support

[Howard Chu <hyc@symas.com>]

Doug Leavitt wrote:
> To the best of my knowledge, within Sun we use almost exclusively
> threads APIs and not LWP APIs.  I scanned the current Nevada (OpenSolaris)
> code base and the only references that remain to LWP calls are
> internally in the threads APIs themselves, the kernel&  syscall interfaces
> and one spot in dtrace.

In fact, you're looking at a completely different API. The code in question is 
for SunOS4 LWP, not SunOS5/Solaris. I'd be shocked if anyone was still running 
a Sparc1/SunOS4 out there today...
> My recommendation is to remove the non-functional LWP code.
>
> If someone at Sun used LWP calls instead of normal thread calls in OpenSolaris
> code, during the code review people here would certainly question it.
>
> Also FYI, during Solaris 10, the threading model was updated to 1-1 LWPs to
> threads vs. MxN LWP pools [prior to Solaris 10], and the thread APIs were
> all moved to libc [libthread is now a stub library so Makefiles don't break].
> This happened as part of the "Solaris Process Model Unification" project.
> Google can provide some further details if desired.
>
> Doug.
>
>
> Hallvard B Furuseth wrote:
> > libraries/libldap_r/thr_lwp.c (SunOS LWP) has since 1999 (rev 1.5) said:
> > /* This implementation NEEDS WORK.   It currently does not compile */
> >
> > I suggest we kill LWP support.  Has anyone tried to use it since 1999?
> >
> > Note, configure --with-threads=lwp turns into either Solaris
> > threads (#define HAVE_THR) or SunOS LWP (#define HAVE_LWP).

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/