Use NonZeroUsize in remutex

components/remutex/lib.rs

@@ -10,13 +10,13 @@
 //! It provides the same interface as https://github.com/rust-lang/rust/blob/master/src/libstd/sys/common/remutex.rs
 //! so if those types are ever exported, we should be able to replace this implemtation.
 
-#![feature(nonzero)]
+#![cfg_attr(feature = "unstable", feature(nonzero))]
 
-extern crate core;
+extern crate nonzero;
 #[macro_use] extern crate lazy_static;
 #[macro_use] extern crate log;
 
-use core::nonzero::NonZero;
+use nonzero::NonZeroUsize;
 use std::cell::{Cell, UnsafeCell};
 use std::ops::Deref;
 use std::sync::{LockResult, Mutex, MutexGuard, PoisonError, TryLockError, TryLockResult};
@@ -27,7 +27,7 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 // TODO: can we use the thread-id crate for this?
 
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
-pub struct ThreadId(NonZero<usize>);
+pub struct ThreadId(NonZeroUsize);
 
 lazy_static!{ static ref THREAD_COUNT: AtomicUsize = AtomicUsize::new(1); }
 
@@ -35,7 +35,7 @@ impl ThreadId {
     #[allow(unsafe_code)]
     fn new() -> ThreadId {
         let number = THREAD_COUNT.fetch_add(1, Ordering::SeqCst);
-        ThreadId(NonZero::new(number).unwrap())
+        ThreadId(NonZeroUsize::new(number).unwrap())
     }
     pub fn current() -> ThreadId {
         THREAD_ID.with(|tls| tls.clone())
@@ -59,13 +59,13 @@ impl AtomicOptThreadId {
     #[allow(unsafe_code)]
     pub fn load(&self, ordering: Ordering) -> Option<ThreadId> {
         let number = self.0.load(ordering);
-        NonZero::new(number).map(ThreadId)
+        NonZeroUsize::new(number).map(ThreadId)
     }
     #[allow(unsafe_code)]
     pub fn swap(&self, value: Option<ThreadId>, ordering: Ordering) -> Option<ThreadId> {
         let number = value.map(|id| id.0.get()).unwrap_or(0);
         let number = self.0.swap(number, ordering);
-        NonZero::new(number).map(ThreadId)
+        NonZeroUsize::new(number).map(ThreadId)
     }
 }