usleep in winmm/wineoss audio

[Simon Britnell]

For some games (HomeWorld 1.05 being the one I'm
working on), a hang occurs where the system thrashes
on an ioctl SNDCTL_GETOSPACE returning with 0
fragments available.  The symptom went away when I
turned on --debugmsg +wave, so it seems to be some
kind of race.

I've introduced a usleep(100); before returning FALSE
when there are no fragments available.  This seems to
fix the problem.

I'm not overly happy with this solution and I'm
examining the code with an eye to using poll/select to
handle this more efficiently.  Any comments?


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