b2dcc910d4fd2a2acce66c128c59d345392f6b2a
test75 sometimes false-fails if something else is going on at the same time, presumably because the child doesn't spin enough to register a nonzero getrusage() cpu time value, as spin() uses the real time to limit the spinning. this change forces spin() to do a minimum amount of spinning before exiting, regardless of scheduling. Change-Id: I57c63d22969bba418f36bcc8c5ace2b6fb445968
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