In article <slr### [at] fwicom> , Ron Parker 
<ron### [at] povrayorg>  wrote:

> might go a long way toward fixing the problem, but I don't know what
> extrwi does.

It is a bit manipulation function (actually, the simple name of a very
complex rotate and mask instruction), that moved the condition code register
(now stored in r0) into a form usable by the xor.  The sequence is part of
optimized code like "a = (b != 0.0)".

And indeed what you suggest gets rid of yet another exit condition, but
after the code already left!  You forgot the note about the (two) cooperate
threads...

> (Windows threads fall off the end of the thread function to exit.  Apparently
> Mac threads set a flag, or at least this one does.)

Mac threads do, too, but it is sitting in a loop calling povray_cooperate,
which is what drives the core code.  Leaving this thread, the core code no
longer runs and cannot accept control messages via POVMS.  As the
povray_cooperate function takes care of the repeated rendering there is no
call to povray_render!

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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