> NetBSD has a pthreads library, but I beileiev it is out of date WRT the
> rest of NetBSD. It does not support m68k. One difficulty with an Amiga
> implementation is that the Ami doesn't support TAS, so a syscall would
> be needed to simulate it (slow).

What TAS instruction has to do with POSIX threads support? In my
understanding it would be convenient in multiprocessor environments
but in the case of Amiga TAS is not needed (maybe that is true in
other m68k-ports too (and I suspect that there is no multiprocessor
aware NetBSD :-))).

++Tero