---

yaml
---
r: 206452
b: refs/heads/beta
c: 833fc27
h: refs/heads/master
v: v3

Author: hydhknn

[refs]

@@ -29,7 +29,7 @@ refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
 refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: 30b883b93f94be643e4b29e32bc8dcdbf07bf1d9
+refs/heads/beta: 833fc273a7e63edea4f44e18112facdafe9185f6
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 579e31929feff51dcaf8d444648eff8de735f91a

branches/beta/src/libstd/sync/rwlock.rs

@@ -171,14 +171,16 @@ impl<T: ?Sized> RwLock<T> {
         RwLockReadGuard::new(&*self.inner, &self.data)
     }
 
-    /// Attempts to acquire this lock with shared read access.
+    /// Attempts to acquire this rwlock with shared read access.
+    ///
+    /// If the access could not be granted at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the shared access
+    /// when it is dropped.
+    ///
+    /// This function does not block.
     ///
-    /// This function will never block and will return immediately if `read`
-    /// would otherwise succeed. Returns `Some` of an RAII guard which will
-    /// release the shared access of this thread when dropped, or `None` if the
-    /// access could not be granted. This method does not provide any
-    /// guarantees with respect to the ordering of whether contentious readers
-    /// or writers will acquire the lock first.
+    /// This function does not provide any guarantees with respect to the ordering
+    /// of whether contentious readers or writers will acquire the lock first.
     ///
     /// # Failure
     ///
@@ -219,9 +221,14 @@ impl<T: ?Sized> RwLock<T> {
 
     /// Attempts to lock this rwlock with exclusive write access.
     ///
-    /// This function does not ever block, and it will return `None` if a call
-    /// to `write` would otherwise block. If successful, an RAII guard is
-    /// returned.
+    /// If the lock could not be acquired at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the lock when
+    /// it is dropped.
+    ///
+    /// This function does not block.
+    ///
+    /// This function does not provide any guarantees with respect to the ordering
+    /// of whether contentious readers or writers will acquire the lock first.
     ///
     /// # Failure
     ///