[rtl] Primitive primitives?

[Tommy Thorn <Tommy.Thorn@irisa.fr>]

Hi all,

while looking for a solution to controlling a servo directly under
Linux, I came across RT Linux.  While at first I thought it looked
ideal, I was truly surprised to discover that there seems to be no
wait to let threads sleep for an arbitrary period, as opposed to a
fixed like with the make_periodic call.

Is there a deep reason for this inflexibility?  Is there a chance
that it might evolve in the future?

Otherwise, RT Linux looks really nice.

Best regards,
  Tommy
PS: The control of a servo is pretty simple: every 20-30 ms the
control line must be taken high for a period of 400 us - 2 ms.  The
duration determines the target angle, with 1.5 ms usually being the
middle position.  I think it should be possible to control up to 12
servos with a standard printer port alone.
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