if "the MH way" could expand to C89 and posix threads, we'd have some
options that were both performance and correct.
I think we already assume C89 as a minimum. However, I'm not sure I want
to jump off the threads cliff just yet :-/
The cheap hack way out of this is to set up a select() loop, create a
pipe(), set a timer, then do the lock. If the alarm fires, write a byte
down the pipe from the signal handler which triggers a return from the
select(), and a lookup of the returned FD tells you "timeout!"
No, really.
--lyndon
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