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Here is a new patch that adds a test, in test_socket.py
TCPTimeoutTest.testInterruptedTimeout(); the functional part
of the patch is unchanged.  The test doesn't use an actual
Ctl-C, or even a SIGINT, as sending one of them seemed hard;
it sends a SIGALRM instead.  The test passes with the patch;
without the patch it prints a confused error message, but
unfortunately that's about right.

As for what I mean by "test", well, I was confused about
what was being threaded.  I have it straight now.