This implements the general fix from
b1a79c6b (in particular, making sure
that Sleep(0) will not immediately resume execution of the thread if
there are no other runnable threads) while preserving the existing
behavior of NtYieldExecution() / SwitchToThread(). Thanks Rémi for the
idea.
Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>