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OK, so it looks like they are using signal() as a
communications mechanism.

Then I'm not sure if it's worth fixing the thread test: the
accept() call just happens to be the call that's being
interrupted by thread creation in the test, but in a real
application, *any* I/O system call can return an error with
EINTR set, and in general this will cause Python application
failures.

Maybe it's better to disable threads on UW...