On Mon, Jun 09, 2014 at 10:23:54PM -0700, Andy Zhou wrote:
> Yes indeed.  ovs_wait() internally sleeps. The first sleep is with
> 0.1 seconds.  So fractional seconds are portable after all.

I don't know whether they are portable in practice, but ovs_wait works
even if they are not portable.  The comment even says that:
    # First try a quick sleep, so that the test completes very quickly
    # in the normal case.  POSIX doesn't require fractional times to
    # work, so this might not work.
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