>>>>> "Jim" == Jim Blandy <xxxxxx@redhat.com> writes:

Jim> But the thread-related problems with GCPRO that I don't see how
Jim> to solve are those created by the user's compiler rearranging
Jim> code that operates directly on heap references.  The compiler is
Jim> free to make copies of heap references in registers where a
Jim> copying GC can't find them to update them.

I don't think so---the typical GCPRO annotation (such as that in
Scheme 48) is going to take the address of the reference (which the
SRFI allows) which limits the compiler's ability to do such things
exactly in the way desired.

(This isn't a comment on the general issue, just on this specific
point.)

--
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla