[SDL] Looping mp3/ogg music

[Mattias Engdegård]

>Actually, I looked at the glibc 2.1 source code, and usleep() is implemented
>using select().  Heheh.

I *did* some experiments before writing that. usleep(10000)
consistently slept for 20 ms. That was with glibc 2.1.3, kernel 2.2.14
(SMP). (Solaris 8 showed the same behaviour, interestingly.)

Of course, if you don't take the nap in the beginning of a tick (say,
do cpu-intensive work for 9 ms first), you will get different figures.

And even 10 ms is still *way* too large - almost the vertical refresh
frequency nowadays