70     tail: CachePadded<AtomicUsize>,  in from_os_status()
108         let tail = 0;  in from_os_status()
135             tail: CachePadded::new(AtomicUsize::new(tail)),  in from_os_status()
156         let mut tail = self.tail.load(Ordering::Relaxed);  in from_os_status()
160             let index = tail & (self.one_lap - 1);  in from_os_status()
161             let lap = tail & !(self.one_lap - 1);  in from_os_status()
168             if tail == stamp {  in from_os_status()
172                     tail + 1  in from_os_status()
181                     .tail  in from_os_status()
182                     .compare_exchange_weak(tail, new_tail, Ordering::SeqCst, Ordering::Relaxed)  in from_os_status()
187                         slot.stamp.store(tail + 1, Ordering::Release);  in from_os_status()
191                         tail = t;  in from_os_status()
195             } else if stamp.wrapping_add(self.one_lap) == tail + 1 {  in from_os_status()
200                 if head.wrapping_add(self.one_lap) == tail {  in from_os_status()
206                 tail = self.tail.load(Ordering::Relaxed);  in from_os_status()
210                 tail = self.tail.load(Ordering::Relaxed);  in from_os_status()
273                 let tail = self.tail.load(Ordering::Relaxed);  in from_os_status()
276                 if tail == head {  in from_os_status()
320         let tail = self.tail.load(Ordering::SeqCst);  in from_os_status()
327         tail == head  in from_os_status()
344         let tail = self.tail.load(Ordering::SeqCst);  in from_os_status()
351         head.wrapping_add(self.one_lap) == tail  in from_os_status()
373             let tail = self.tail.load(Ordering::SeqCst);  in from_os_status()
377             if self.tail.load(Ordering::SeqCst) == tail {  in from_os_status()
379                 let tix = tail & (self.one_lap - 1);  in from_os_status()
385                 } else if tail == head {  in from_os_status()