thread-safe exceptions (first cut)

[Teemu Torma]

    From:  mrs@wrs.com (Mike Stump)
    Date:  Fri, 12 Sep 1997 14:24:18 -0700

    Oh, one has to be careful to watch for thread creation calls, and not
    cache the returned pointer across them.  I thought it would be easier
    to manage this with the pseudo code, rather than the cse code.
    
I think most if not all threads implementations start the new thread
by calling a separate subroutine, so there should be no need to watch
for thread creation.  

Teemu