delays in lightspeed C

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I am working on a project (in lightspeed C on a MAC II), and I require
a statement similar to the turbo-pascal DELAY(X); procedure call,
where X is the number of milliseconds that the program waits. So far
I have not been able to find such a function. I have been implementing
millisecond-delays with for structures, which compute some dummy
result over and over; the problem with this is that I can not control
the amount of time that the computer spneds on this function exactly.
The function sleep would be fine; however, I need milliseconds and not
seconds. Any suggestions? By the way, the program interfaces with a
synchro-to digital converter interface, which computes an angle value and
is very slow (at 16bits resolution...).

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