* Used the predicate version of condition_variable::wait_until() which
correctly handles time jump events.
* Fixed an issue with sync_timed_queue::pull_until()/pull_for() where
they could incorrectly return queue_op_status::timeout instead of
queue_op_status::success.
* Changed sync_timed_queue::wait_pull() to return
queue_op_status::success instead of queue_op_status::closed when the
queue has been closed but an item is available and is ready to be
pulled off the queue.
* Changed sync_priority_queue::pull_until()/pull_for() and
sync_timed_queue::pull_until()/pull_for() to return
queue_op_status::closed instead of throwing an exception when the
queue is closed since they have a queue_op_status return type.
