Revert previous fix.  Instead, using a wait queue to cut down CPU cost.
Revert previous fix.  Instead, using a wait queue to cut down CPU cost.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable