process-whostate sometimes returns a weird value

[rme]

Sometimes, something like this happens.

Welcome to Clozure Common Lisp Version 1.2-r10446:10448M-trunk  (DarwinX8632)!
? (process-run-function "do nothing" (lambda ()))
#<PROCESS do nothing(2) [#<Unprintable IMMEDIATE : #xF3>] #x88CB886>

#xf3 is x8632::subtag-no-thread-local-binding.

One expect to see this:

#<PROCESS do nothing(2) [Reset] #x88CB886>

[gb]

%TCR-BINDING-LOCATION is supposed to check for that (i.e., if the contents of the fixnum representing a native-word-aligned address are target::subtag-no-thread-local-binding) and return NIL rather than that fixnum. The tcr's thread is supposed to be suspended while we're looking at it, so it would seem that either the check for the no-thread-local-binding-marker is wrong or (b) there are memory-synchronization issues involved here.

I hope that it's (a), or (c) something else entirely.

[gb]

Never mind; we suspend the tcr and check to see if it has a thread-local binding for *WHOSTATE*, conclude that it does, then resume the tcr and allow its state to change.

D'oh.

[rme]

Fixed in r10461.