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I don't have Solaris access, and I can't get this to break
on Linux. But I agree with your suggestion that posix
threads should block signals.

Are you capable of coming up with a patch that does that, in
a way that is independent of the specific platform (as long
as it has PTHREADS)? You may have to open a new issue in the
patch manager, since SF doesn't allow after-the-fact
attachments to anonymous entries. (Maybe SF logs you out
whenever you quit your browser? That's what it does for me.
:-)