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Date: Thu, 03 Aug 2006 11:33:14 -0700
From: Peter Grehan <grehan@freebsd.org>
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To: Daniel Eischen <deischen@freebsd.org>
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Cc: "current@freebsd.org" <current@freebsd.org>,
	Maxim Sobolev <sobomax@sippysoft.com>, freebsd-ppc@freebsd.org
Subject: Re: Looks like threading is b0rken on FreeBSD/powerpc
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> No, I've no idea.  Nothing's changed that I know of.  I'm surprised
> that it (powerpc libpthread) works!  I know some supporting MD bits
> were added to libpthread but never knew that they actually worked :)

  It only works in system scope. In theory it could work in process 
scope, though there's no simple way to determine if floating point regs 
have been used by another thread so you have to unconditionally 
context-switch fp state.

  I did a limited amount of testing, mostly with apps and the Sun 
'ping-pong' thread test. I think Suleiman also ran up a bunch of larger 
apps with it (e.g. apache-threads).

  But that was in the 6.0 timeframe, and I've not seriously run up PPC 
for a few months now, certainly not since jemalloc went in.

> Has the compiler changed recently?

  Nope, still at 3.4.4.

later,

Peter.