3 files changed, 35 insertions, 12 deletions
diff --git a/vendor/lock_api/src/mutex.rs b/vendor/lock_api/src/mutex.rs
index 4e1b879e5..c97e5430b 100644
--- a/vendor/lock_api/src/mutex.rs
+++ b/vendor/lock_api/src/mutex.rs
@@ -681,15 +681,38 @@ unsafe impl<'a, R: RawMutex + 'a, T: ?Sized + 'a> StableAddress for MutexGuard<'
 #[must_use = "if unused the Mutex will immediately unlock"]
 pub struct ArcMutexGuard<R: RawMutex, T: ?Sized> {
     mutex: Arc<Mutex<R, T>>,
-    marker: PhantomData<R::GuardMarker>,
+    marker: PhantomData<*const ()>,
+}
+
+#[cfg(feature = "arc_lock")]
+unsafe impl<R: RawMutex + Send + Sync, T: Send + ?Sized> Send for ArcMutexGuard<R, T> where
+    R::GuardMarker: Send
+{
+}
+#[cfg(feature = "arc_lock")]
+unsafe impl<R: RawMutex + Sync, T: Sync + ?Sized> Sync for ArcMutexGuard<R, T> where
+    R::GuardMarker: Sync
+{
 }
 
 #[cfg(feature = "arc_lock")]
 impl<R: RawMutex, T: ?Sized> ArcMutexGuard<R, T> {
     /// Returns a reference to the `Mutex` this is guarding, contained in its `Arc`.
     #[inline]
-    pub fn mutex(&self) -> &Arc<Mutex<R, T>> {
-        &self.mutex
+    pub fn mutex(s: &Self) -> &Arc<Mutex<R, T>> {
+        &s.mutex
+    }
+
+    /// Unlocks the mutex and returns the `Arc` that was held by the [`ArcMutexGuard`].
+    #[inline]
+    pub fn into_arc(s: Self) -> Arc<Mutex<R, T>> {
+        // Safety: Skip our Drop impl and manually unlock the mutex.
+        let arc = unsafe { ptr::read(&s.mutex) };
+        mem::forget(s);
+        unsafe {
+            arc.raw.unlock();
+        }
+        arc
     }
 
     /// Temporarily unlocks the mutex to execute the given function.
diff --git a/vendor/lock_api/src/remutex.rs b/vendor/lock_api/src/remutex.rs
index fa0e934d1..3e2010f2b 100644
--- a/vendor/lock_api/src/remutex.rs
+++ b/vendor/lock_api/src/remutex.rs
@@ -646,7 +646,7 @@ impl<'a, R: RawMutex + 'a, G: GetThreadId + 'a, T: ?Sized + 'a> ReentrantMutexGu
     /// in already locked the mutex.
     ///
     /// This is an associated function that needs to be
-    /// used as `ReentrantMutexGuard::map(...)`. A method would interfere with methods of
+    /// used as `ReentrantMutexGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(
@@ -654,10 +654,10 @@ impl<'a, R: RawMutex + 'a, G: GetThreadId + 'a, T: ?Sized + 'a> ReentrantMutexGu
         f: F,
     ) -> Result<MappedReentrantMutexGuard<'a, R, G, U>, Self>
     where
-        F: FnOnce(&mut T) -> Option<&mut U>,
+        F: FnOnce(&T) -> Option<&U>,
     {
         let raw = &s.remutex.raw;
-        let data = match f(unsafe { &mut *s.remutex.data.get() }) {
+        let data = match f(unsafe { &*s.remutex.data.get() }) {
             Some(data) => data,
             None => return Err(s),
         };
@@ -942,7 +942,7 @@ impl<'a, R: RawMutex + 'a, G: GetThreadId + 'a, T: ?Sized + 'a>
     /// in already locked the mutex.
     ///
     /// This is an associated function that needs to be
-    /// used as `MappedReentrantMutexGuard::map(...)`. A method would interfere with methods of
+    /// used as `MappedReentrantMutexGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(
diff --git a/vendor/lock_api/src/rwlock.rs b/vendor/lock_api/src/rwlock.rs
index e947f1ec0..c972fb6c6 100644
--- a/vendor/lock_api/src/rwlock.rs
+++ b/vendor/lock_api/src/rwlock.rs
@@ -1218,13 +1218,13 @@ impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> RwLockReadGuard<'a, R, T> {
     }
 
     /// Attempts to make  a new `MappedRwLockReadGuard` for a component of the
-    /// locked data. The original guard is return if the closure returns `None`.
+    /// locked data. Returns the original guard if the closure returns `None`.
     ///
     /// This operation cannot fail as the `RwLockReadGuard` passed
     /// in already locked the data.
     ///
     /// This is an associated function that needs to be
-    /// used as `RwLockReadGuard::map(...)`. A method would interfere with methods of
+    /// used as `RwLockReadGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(s: Self, f: F) -> Result<MappedRwLockReadGuard<'a, R, U>, Self>
@@ -1512,7 +1512,7 @@ impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> RwLockWriteGuard<'a, R, T> {
     /// in already locked the data.
     ///
     /// This is an associated function that needs to be
-    /// used as `RwLockWriteGuard::map(...)`. A method would interfere with methods of
+    /// used as `RwLockWriteGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(s: Self, f: F) -> Result<MappedRwLockWriteGuard<'a, R, U>, Self>
@@ -2374,7 +2374,7 @@ impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> MappedRwLockReadGuard<'a, R, T> {
     /// in already locked the data.
     ///
     /// This is an associated function that needs to be
-    /// used as `MappedRwLockReadGuard::map(...)`. A method would interfere with methods of
+    /// used as `MappedRwLockReadGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(s: Self, f: F) -> Result<MappedRwLockReadGuard<'a, R, U>, Self>
@@ -2512,7 +2512,7 @@ impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> MappedRwLockWriteGuard<'a, R, T> {
     /// in already locked the data.
     ///
     /// This is an associated function that needs to be
-    /// used as `MappedRwLockWriteGuard::map(...)`. A method would interfere with methods of
+    /// used as `MappedRwLockWriteGuard::try_map(...)`. A method would interfere with methods of
     /// the same name on the contents of the locked data.
     #[inline]
     pub fn try_map<U: ?Sized, F>(s: Self, f: F) -> Result<MappedRwLockWriteGuard<'a, R, U>, Self>