32 const NOTIFIED: usize = 2;  constant
85             .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst)  in park()
96             Err(NOTIFIED) => {  in park()
104                 debug_assert_eq!(old, NOTIFIED, "park state changed unexpectedly");  in park()
116                 .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst)  in park()
132             .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst)  in park_timeout()
146             Err(NOTIFIED) => {  in park_timeout()
149                 debug_assert_eq!(old, NOTIFIED, "park state changed unexpectedly");  in park_timeout()
163             NOTIFIED => {} // got a notification, hurray!  in park_timeout()
175         match self.state.swap(NOTIFIED, SeqCst) {  in unpark()
177             NOTIFIED => return, // already unparked  in unpark()