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In version 3.2 and earlier, Process.join() and Connection.poll() treat negative timeouts as zero timeouts. (Thread.join() does the same.)
In the current 3.3 version, they treat negative timeouts as infinite timeouts. Also multiprocessing.connection.wait() (new in 3.3) currently treats them as infinite on Unix and zero on Windows.
The attached patch fixes the regression with Process.join() and Connection.poll(). It also makes wait() treat negative timeouts as zero on both Windows and Unix.
It is worth noting that there is a fair amount of inconsistency in the handling of negative timeouts in the stdlib in 3.2:
Treat negative as infinite:
 select.select
 select.*.poll
 threading.*.acquire (new in 3.2)
 multiprocessing.dummy.*.acquire (new in 3.2)
Treat negative as zero:
 threading.Thread.join
 threading.(Condition|Event).wait
 multiprocessing.Process.join
 multiprocessing.*.acquire
 multiprocessing.(Condition|Event).wait
 multiprocessing.Connection.poll
 multiprocessing.Queue.(get|put)
 concurrent.futures.Future.result
 concurrent.futures.wait
Treat negative as error:
 queue.Queue.(get|put)
 socket.socket.settimeout

New changeset 99ef4501205b by Richard Oudkerk in branch 'default':
Issue #14753: Make multiprocessing treat negative timeouts as it did in 3.2
http://hg.python.org/cpython/rev/99ef4501205b