Upgrade rust/crates/lock_api to 0.4.5 am: 3272971475 am: 42502d8df4 am: 1fd07417ce

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/lock_api/+/1833321

Change-Id: I3e91ecccbd6ee580d63e19d0ffb91a11edf97581

9 files changed, 1200 insertions, 22 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 6ffdcd3..58935f2 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "0dcf7ce54a4f8ca76367c1bd2eeb48644b416d84"
+    "sha1": "18001b819c1539c06c176c671bbe54e70b5c3d69"
   }
 }
diff --git a/Android.bp b/Android.bp
index 74f015c..8f93604 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,4 @@
-// This file is generated by cargo2android.py --run --device --dependencies --tests.
+// This file is generated by cargo2android.py --run --device --tests.
 // Do not modify this file as changes will be overridden on upgrade.
 
 package {
@@ -41,6 +41,8 @@ rust_library {
     name: "liblock_api",
     host_supported: true,
     crate_name: "lock_api",
+    cargo_env_compat: true,
+    cargo_pkg_version: "0.4.5",
     srcs: ["src/lib.rs"],
     edition: "2018",
     rustlibs: [
@@ -49,9 +51,11 @@ rust_library {
 }
 
 rust_defaults {
-    name: "lock_api_defaults",
+    name: "lock_api_test_defaults",
     crate_name: "lock_api",
     srcs: ["src/lib.rs"],
+    cargo_env_compat: true,
+    cargo_pkg_version: "0.4.5",
     test_suites: ["general-tests"],
     auto_gen_config: true,
     edition: "2018",
@@ -62,7 +66,7 @@ rust_defaults {
 
 rust_test_host {
     name: "lock_api_host_test_src_lib",
-    defaults: ["lock_api_defaults"],
+    defaults: ["lock_api_test_defaults"],
     test_options: {
         unit_test: true,
     },
@@ -70,8 +74,5 @@ rust_test_host {
 
 rust_test {
     name: "lock_api_device_test_src_lib",
-    defaults: ["lock_api_defaults"],
+    defaults: ["lock_api_test_defaults"],
 }
-
-// dependent_library ["feature_list"]
-//   scopeguard-1.1.0
diff --git a/Cargo.toml b/Cargo.toml
index 213250b..4382f30 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,17 +3,16 @@
 # When uploading crates to the registry Cargo will automatically
 # "normalize" Cargo.toml files for maximal compatibility
 # with all versions of Cargo and also rewrite `path` dependencies
-# to registry (e.g., crates.io) dependencies
+# to registry (e.g., crates.io) dependencies.
 #
-# If you believe there's an error in this file please file an
-# issue against the rust-lang/cargo repository. If you're
-# editing this file be aware that the upstream Cargo.toml
-# will likely look very different (and much more reasonable)
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
 
 [package]
 edition = "2018"
 name = "lock_api"
-version = "0.4.4"
+version = "0.4.5"
 authors = ["Amanieu d'Antras <amanieu@gmail.com>"]
 description = "Wrappers to create fully-featured Mutex and RwLock types. Compatible with no_std."
 keywords = ["mutex", "rwlock", "lock", "no_std"]
@@ -29,9 +28,10 @@ version = "1.1.0"
 default-features = false
 
 [dependencies.serde]
-version = "1.0.114"
+version = "1.0.126"
 optional = true
 default-features = false
 
 [features]
+arc_lock = []
 nightly = []
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 55b5c35..96ffdfc 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "lock_api"
-version = "0.4.4"
+version = "0.4.5"
 authors = ["Amanieu d'Antras <amanieu@gmail.com>"]
 description = "Wrappers to create fully-featured Mutex and RwLock types. Compatible with no_std."
 license = "Apache-2.0/MIT"
@@ -16,7 +16,8 @@ owning_ref = { version = "0.4.1", optional = true }
 # Optional dependency for supporting serde.  Optional crates automatically
 # create a feature with the same name as the crate, so if you need serde
 # support, just pass "--features serde" when building this crate.
-serde = { version = "1.0.114", default-features = false, optional = true }
+serde = { version = "1.0.126", default-features = false, optional = true }
 
 [features]
 nightly = []
+arc_lock = []
diff --git a/METADATA b/METADATA
index efad828..ebfc44b 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@ third_party {
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/lock_api/lock_api-0.4.4.crate"
+    value: "https://static.crates.io/crates/lock_api/lock_api-0.4.5.crate"
   }
-  version: "0.4.4"
+  version: "0.4.5"
   license_type: NOTICE
   last_upgrade_date {
     year: 2021
-    month: 5
-    day: 19
+    month: 9
+    day: 22
   }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 6d58135..c99c68b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -79,9 +79,11 @@
 //!
 //! # Cargo features
 //!
-//! This crate supports two cargo features:
+//! This crate supports three cargo features:
 //!
 //! - `owning_ref`: Allows your lock types to be used with the `owning_ref` crate.
+//! - `arc_lock`: Enables locking from an `Arc`. This enables types such as `ArcMutexGuard`. Note that this
+//!   requires the `alloc` crate to be present.
 //! - `nightly`: Enables nightly-only features. At the moment the only such
 //!   feature is `const fn` constructors for lock types.
 
@@ -93,6 +95,9 @@
 #[macro_use]
 extern crate scopeguard;
 
+#[cfg(feature = "arc_lock")]
+extern crate alloc;
+
 /// Marker type which indicates that the Guard type for a lock is `Send`.
 pub struct GuardSend(());
 
diff --git a/src/mutex.rs b/src/mutex.rs
index aded96d..f64fc13 100644
--- a/src/mutex.rs
+++ b/src/mutex.rs
@@ -11,6 +11,13 @@ use core::marker::PhantomData;
 use core::mem;
 use core::ops::{Deref, DerefMut};
 
+#[cfg(feature = "arc_lock")]
+use alloc::sync::Arc;
+#[cfg(feature = "arc_lock")]
+use core::mem::ManuallyDrop;
+#[cfg(feature = "arc_lock")]
+use core::ptr;
+
 #[cfg(feature = "owning_ref")]
 use owning_ref::StableAddress;
 
@@ -286,6 +293,45 @@ impl<R: RawMutex, T: ?Sized> Mutex<R, T> {
     pub fn data_ptr(&self) -> *mut T {
         self.data.get()
     }
+
+    /// # Safety
+    ///
+    /// The lock needs to be held for the behavior of this function to be defined.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    unsafe fn guard_arc(self: &Arc<Self>) -> ArcMutexGuard<R, T> {
+        ArcMutexGuard {
+            mutex: self.clone(),
+            marker: PhantomData,
+        }
+    }
+
+    /// Acquires a lock through an `Arc`.
+    ///
+    /// This method is similar to the `lock` method; however, it requires the `Mutex` to be inside of an `Arc`
+    /// and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn lock_arc(self: &Arc<Self>) -> ArcMutexGuard<R, T> {
+        self.raw.lock();
+        // SAFETY: the locking guarantee is upheld
+        unsafe { self.guard_arc() }
+    }
+
+    /// Attempts to acquire a lock through an `Arc`.
+    ///
+    /// This method is similar to the `try_lock` method; however, it requires the `Mutex` to be inside of an
+    /// `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc(self: &Arc<Self>) -> Option<ArcMutexGuard<R, T>> {
+        if self.raw.try_lock() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawMutexFair, T: ?Sized> Mutex<R, T> {
@@ -336,6 +382,39 @@ impl<R: RawMutexTimed, T: ?Sized> Mutex<R, T> {
             None
         }
     }
+
+    /// Attempts to acquire this lock through an `Arc` until a timeout is reached.
+    ///
+    /// This method is similar to the `try_lock_for` method; however, it requires the `Mutex` to be inside of an
+    /// `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc_for(self: &Arc<Self>, timeout: R::Duration) -> Option<ArcMutexGuard<R, T>> {
+        if self.raw.try_lock_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to acquire this lock through an `Arc` until a timeout is reached.
+    ///
+    /// This method is similar to the `try_lock_until` method; however, it requires the `Mutex` to be inside of
+    /// an `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc_until(
+        self: &Arc<Self>,
+        timeout: R::Instant,
+    ) -> Option<ArcMutexGuard<R, T>> {
+        if self.raw.try_lock_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawMutex, T: ?Sized + Default> Default for Mutex<R, T> {
@@ -583,6 +662,116 @@ impl<'a, R: RawMutex + 'a, T: fmt::Display + ?Sized + 'a> fmt::Display for Mutex
 #[cfg(feature = "owning_ref")]
 unsafe impl<'a, R: RawMutex + 'a, T: ?Sized + 'a> StableAddress for MutexGuard<'a, R, T> {}
 
+/// An RAII mutex guard returned by the `Arc` locking operations on `Mutex`.
+/// 
+/// This is similar to the `MutexGuard` struct, except instead of using a reference to unlock the `Mutex` it 
+/// uses an `Arc<Mutex>`. This has several advantages, most notably that it has an `'static` lifetime.
+#[cfg(feature = "arc_lock")]
+#[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>,
+}
+
+#[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
+    }
+
+    /// Temporarily unlocks the mutex to execute the given function.
+    ///
+    /// This is safe because `&mut` guarantees that there exist no other
+    /// references to the data protected by the mutex.
+    #[inline]
+    pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: A MutexGuard always holds the lock.
+        unsafe {
+            s.mutex.raw.unlock();
+        }
+        defer!(s.mutex.raw.lock());
+        f()
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutexFair, T: ?Sized> ArcMutexGuard<R, T> {
+    /// Unlocks the mutex using a fair unlock protocol.
+    ///
+    /// This is functionally identical to the `unlock_fair` method on [`MutexGuard`].
+    #[inline]
+    pub fn unlock_fair(s: Self) {
+        // Safety: A MutexGuard always holds the lock.
+        unsafe {
+            s.mutex.raw.unlock_fair();
+        }
+
+        // SAFETY: make sure the Arc gets it reference decremented
+        let mut s = ManuallyDrop::new(s);
+        unsafe { ptr::drop_in_place(&mut s.mutex) }; 
+    }
+
+    /// Temporarily unlocks the mutex to execute the given function.
+    ///
+    /// This is functionally identical to the `unlocked_fair` method on [`MutexGuard`].
+    #[inline]
+    pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: A MutexGuard always holds the lock.
+        unsafe {
+            s.mutex.raw.unlock_fair();
+        }
+        defer!(s.mutex.raw.lock());
+        f()
+    }
+
+    /// Temporarily yields the mutex to a waiting thread if there is one.
+    ///
+    /// This is functionally identical to the `bump` method on [`MutexGuard`].
+    #[inline]
+    pub fn bump(s: &mut Self) {
+        // Safety: A MutexGuard always holds the lock.
+        unsafe {
+            s.mutex.raw.bump();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, T: ?Sized> Deref for ArcMutexGuard<R, T> {
+    type Target = T;
+    #[inline]
+    fn deref(&self) -> &T {
+        unsafe { &*self.mutex.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, T: ?Sized> DerefMut for ArcMutexGuard<R, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.mutex.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, T: ?Sized> Drop for ArcMutexGuard<R, T> {
+    #[inline]
+    fn drop(&mut self) {
+        // Safety: A MutexGuard always holds the lock.
+        unsafe {
+            self.mutex.raw.unlock();
+        }
+    }
+}
+
 /// An RAII mutex guard returned by `MutexGuard::map`, which can point to a
 /// subfield of the protected data.
 ///
diff --git a/src/remutex.rs b/src/remutex.rs
index b49ec6c..8493a24 100644
--- a/src/remutex.rs
+++ b/src/remutex.rs
@@ -19,6 +19,13 @@ use core::{
     sync::atomic::{AtomicUsize, Ordering},
 };
 
+#[cfg(feature = "arc_lock")]
+use alloc::sync::Arc;
+#[cfg(feature = "arc_lock")]
+use core::mem::ManuallyDrop;
+#[cfg(feature = "arc_lock")]
+use core::ptr;
+
 #[cfg(feature = "owning_ref")]
 use owning_ref::StableAddress;
 
@@ -392,6 +399,45 @@ impl<R: RawMutex, G: GetThreadId, T: ?Sized> ReentrantMutex<R, G, T> {
     pub fn data_ptr(&self) -> *mut T {
         self.data.get()
     }
+
+    /// # Safety
+    /// 
+    /// The lock must be held before calling this method.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    unsafe fn guard_arc(self: &Arc<Self>) -> ArcReentrantMutexGuard<R, G, T> {
+        ArcReentrantMutexGuard {
+            remutex: self.clone(),
+            marker: PhantomData,
+        }
+    }
+
+    /// Acquires a reentrant mutex through an `Arc`.
+    /// 
+    /// This method is similar to the `lock` method; however, it requires the `ReentrantMutex` to be inside of an
+    /// `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn lock_arc(self: &Arc<Self>) -> ArcReentrantMutexGuard<R, G, T> {
+        self.raw.lock();
+        // SAFETY: locking guarantee is upheld
+        unsafe { self.guard_arc() }
+    }
+
+    /// Attempts to acquire a reentrant mutex through an `Arc`.
+    /// 
+    /// This method is similar to the `try_lock` method; however, it requires the `ReentrantMutex` to be inside
+    /// of an `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc(self: &Arc<Self>) -> Option<ArcReentrantMutexGuard<R, G, T>> {
+        if self.raw.try_lock() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawMutexFair, G: GetThreadId, T: ?Sized> ReentrantMutex<R, G, T> {
@@ -442,6 +488,36 @@ impl<R: RawMutexTimed, G: GetThreadId, T: ?Sized> ReentrantMutex<R, G, T> {
             None
         }
     }
+
+    /// Attempts to acquire this lock until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_lock_for` method; however, it requires the `ReentrantMutex` to be
+    /// inside of an `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc_for(self: &Arc<Self>, timeout: R::Duration) -> Option<ArcReentrantMutexGuard<R, G, T>> {
+        if self.raw.try_lock_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to acquire this lock until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_lock_until` method; however, it requires the `ReentrantMutex` to be
+    /// inside of an `Arc` and the resulting mutex guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_lock_arc_until(self: &Arc<Self>, timeout: R::Instant) -> Option<ArcReentrantMutexGuard<R, G, T>> {
+        if self.raw.try_lock_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawMutex, G: GetThreadId, T: ?Sized + Default> Default for ReentrantMutex<R, G, T> {
@@ -660,6 +736,7 @@ impl<'a, R: RawMutexFair + 'a, G: GetThreadId + 'a, T: ?Sized + 'a>
             s.remutex.raw.bump();
         }
     }
+
 }
 
 impl<'a, R: RawMutex + 'a, G: GetThreadId + 'a, T: ?Sized + 'a> Deref
@@ -706,6 +783,114 @@ unsafe impl<'a, R: RawMutex + 'a, G: GetThreadId + 'a, T: ?Sized + 'a> StableAdd
 {
 }
 
+/// An RAII mutex guard returned by the `Arc` locking operations on `ReentrantMutex`. 
+/// 
+/// This is similar to the `ReentrantMutexGuard` struct, except instead of using a reference to unlock the 
+/// `Mutex` it uses an `Arc<ReentrantMutex>`. This has several advantages, most notably that it has an `'static`
+/// lifetime.
+#[cfg(feature = "arc_lock")]
+#[must_use = "if unused the ReentrantMutex will immediately unlock"]
+pub struct ArcReentrantMutexGuard<R: RawMutex, G: GetThreadId, T: ?Sized> {
+    remutex: Arc<ReentrantMutex<R, G, T>>,
+    marker: PhantomData<GuardNoSend>,
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, G: GetThreadId, T: ?Sized> ArcReentrantMutexGuard<R, G, T> {
+    /// Returns a reference to the `ReentrantMutex` this object is guarding, contained in its `Arc`.
+    pub fn remutex(s: &Self) -> &Arc<ReentrantMutex<R, G, T>> {
+        &s.remutex
+    }
+
+    /// Temporarily unlocks the mutex to execute the given function.
+    ///
+    /// This is safe because `&mut` guarantees that there exist no other
+    /// references to the data protected by the mutex.
+    #[inline]
+    pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: A ReentrantMutexGuard always holds the lock.
+        unsafe {
+            s.remutex.raw.unlock();
+        }
+        defer!(s.remutex.raw.lock());
+        f()
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutexFair, G: GetThreadId, T: ?Sized>
+    ArcReentrantMutexGuard<R, G, T>
+{
+    /// Unlocks the mutex using a fair unlock protocol.
+    ///
+    /// This is functionally identical to the `unlock_fair` method on [`ReentrantMutexGuard`].
+    #[inline]
+    pub fn unlock_fair(s: Self) {
+        // Safety: A ReentrantMutexGuard always holds the lock
+        unsafe {
+            s.remutex.raw.unlock_fair();
+        }
+
+        // SAFETY: ensure that the Arc's refcount is decremented
+        let mut s = ManuallyDrop::new(s);
+        unsafe { ptr::drop_in_place(&mut s.remutex) };
+    }
+
+    /// Temporarily unlocks the mutex to execute the given function.
+    ///
+    /// This is functionally identical to the `unlocked_fair` method on [`ReentrantMutexGuard`].
+    #[inline]
+    pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: A ReentrantMutexGuard always holds the lock
+        unsafe {
+            s.remutex.raw.unlock_fair();
+        }
+        defer!(s.remutex.raw.lock());
+        f()
+    }
+
+    /// Temporarily yields the mutex to a waiting thread if there is one.
+    ///
+    /// This is functionally equivalent to the `bump` method on [`ReentrantMutexGuard`].
+    #[inline]
+    pub fn bump(s: &mut Self) {
+        // Safety: A ReentrantMutexGuard always holds the lock
+        unsafe {
+            s.remutex.raw.bump();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, G: GetThreadId, T: ?Sized> Deref
+    for ArcReentrantMutexGuard<R, G, T>
+{
+    type Target = T;
+    #[inline]
+    fn deref(&self) -> &T {
+        unsafe { &*self.remutex.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawMutex, G: GetThreadId, T: ?Sized> Drop
+    for ArcReentrantMutexGuard<R, G, T>
+{
+    #[inline]
+    fn drop(&mut self) {
+        // Safety: A ReentrantMutexGuard always holds the lock.
+        unsafe {
+            self.remutex.raw.unlock();
+        }
+    }
+}
+
 /// An RAII mutex guard returned by `ReentrantMutexGuard::map`, which can point to a
 /// subfield of the protected data.
 ///
diff --git a/src/rwlock.rs b/src/rwlock.rs
index e97de98..c404934 100644
--- a/src/rwlock.rs
+++ b/src/rwlock.rs
@@ -11,6 +11,13 @@ use core::marker::PhantomData;
 use core::mem;
 use core::ops::{Deref, DerefMut};
 
+#[cfg(feature = "arc_lock")]
+use alloc::sync::Arc;
+#[cfg(feature = "arc_lock")]
+use core::mem::ManuallyDrop;
+#[cfg(feature = "arc_lock")]
+use core::ptr;
+
 #[cfg(feature = "owning_ref")]
 use owning_ref::StableAddress;
 
@@ -557,6 +564,84 @@ impl<R: RawRwLock, T: ?Sized> RwLock<R, T> {
     pub fn data_ptr(&self) -> *mut T {
         self.data.get()
     }
+
+    /// # Safety
+    ///
+    /// The lock must be held when calling this method.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    unsafe fn read_guard_arc(self: &Arc<Self>) -> ArcRwLockReadGuard<R, T> {
+        ArcRwLockReadGuard {
+            rwlock: self.clone(),
+            marker: PhantomData,
+        }
+    }
+
+    /// # Safety
+    ///
+    /// The lock must be held when calling this method.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    unsafe fn write_guard_arc(self: &Arc<Self>) -> ArcRwLockWriteGuard<R, T> {
+        ArcRwLockWriteGuard {
+            rwlock: self.clone(),
+            marker: PhantomData,
+        }
+    }
+
+    /// Locks this `RwLock` with read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `read` method; however, it requires the `RwLock` to be inside of an `Arc`
+    /// and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn read_arc(self: &Arc<Self>) -> ArcRwLockReadGuard<R, T> {
+        self.raw.lock_shared();
+        // SAFETY: locking guarantee is upheld
+        unsafe { self.read_guard_arc() }
+    }
+
+    /// Attempts to lock this `RwLock` with read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_read` method; however, it requires the `RwLock` to be inside of an 
+    /// `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_arc(self: &Arc<Self>) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Locks this `RwLock` with write access, through an `Arc`.
+    /// 
+    /// This method is similar to the `write` method; however, it requires the `RwLock` to be inside of an `Arc`
+    /// and the resulting write guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn write_arc(self: &Arc<Self>) -> ArcRwLockWriteGuard<R, T> {
+        self.raw.lock_exclusive();
+        // SAFETY: locking guarantee is upheld
+        unsafe { self.write_guard_arc() }
+    }
+
+    /// Attempts to lock this `RwLock` with writ access, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_write` method; however, it requires the `RwLock` to be inside of an 
+    /// `Arc` and the resulting write guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_write_arc(self: &Arc<Self>) -> Option<ArcRwLockWriteGuard<R, T>> {
+        if self.raw.try_lock_exclusive() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.write_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLockFair, T: ?Sized> RwLock<R, T> {
@@ -657,6 +742,66 @@ impl<R: RawRwLockTimed, T: ?Sized> RwLock<R, T> {
             None
         }
     }
+
+    /// Attempts to acquire this `RwLock` with read access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_read_for` method; however, it requires the `RwLock` to be inside of an
+    /// `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_arc_for(self: &Arc<Self>, timeout: R::Duration) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to acquire this `RwLock` with read access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_read_until` method; however, it requires the `RwLock` to be inside of
+    /// an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_arc_until(self: &Arc<Self>, timeout: R::Instant) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to acquire this `RwLock` with write access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_write_for` method; however, it requires the `RwLock` to be inside of
+    /// an `Arc` and the resulting write guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_write_arc_for(self: &Arc<Self>, timeout: R::Duration) -> Option<ArcRwLockWriteGuard<R, T>> {
+        if self.raw.try_lock_exclusive_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.write_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to acquire this `RwLock` with read access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_write_until` method; however, it requires the `RwLock` to be inside of
+    /// an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_write_arc_until(self: &Arc<Self>, timeout: R::Instant) -> Option<ArcRwLockWriteGuard<R, T>> {
+        if self.raw.try_lock_exclusive_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.write_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLockRecursive, T: ?Sized> RwLock<R, T> {
@@ -701,6 +846,33 @@ impl<R: RawRwLockRecursive, T: ?Sized> RwLock<R, T> {
             None
         }
     }
+
+    /// Locks this `RwLock` with shared read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `read_recursive` method; however, it requires the `RwLock` to be inside of
+    /// an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn read_arc_recursive(self: &Arc<Self>) -> ArcRwLockReadGuard<R, T> {
+        self.raw.lock_shared_recursive();
+        // SAFETY: locking guarantee is upheld
+        unsafe { self.read_guard_arc() }
+    }
+
+    /// Attempts to lock this `RwLock` with shared read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_read_recursive` method; however, it requires the `RwLock` to be inside
+    /// of an `Arc` and the resulting read guard has no lifetime requirements.   
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_recursive_arc(self: &Arc<Self>) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared_recursive() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLockRecursiveTimed, T: ?Sized> RwLock<R, T> {
@@ -745,6 +917,36 @@ impl<R: RawRwLockRecursiveTimed, T: ?Sized> RwLock<R, T> {
             None
         }
     }
+
+    /// Attempts to lock this `RwLock` with read access until a timeout is reached, through an `Arc`.
+    ///
+    /// This method is similar to the `try_read_recursive_for` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_arc_recursive_for(self: &Arc<Self>, timeout: R::Duration) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared_recursive_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to lock this `RwLock` with read access until a timeout is reached, through an `Arc`.
+    ///
+    /// This method is similar to the `try_read_recursive_until` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_read_arc_recursive_until(self: &Arc<Self>, timeout: R::Instant) -> Option<ArcRwLockReadGuard<R, T>> {
+        if self.raw.try_lock_shared_recursive_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.read_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLockUpgrade, T: ?Sized> RwLock<R, T> {
@@ -791,6 +993,45 @@ impl<R: RawRwLockUpgrade, T: ?Sized> RwLock<R, T> {
             None
         }
     }
+
+    /// # Safety
+    /// 
+    /// The lock must be held when calling this method.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    unsafe fn upgradable_guard_arc(self: &Arc<Self>) -> ArcRwLockUpgradableReadGuard<R, T> {
+        ArcRwLockUpgradableReadGuard {
+            rwlock: self.clone(),
+            marker: PhantomData 
+        }
+    }
+
+    /// Locks this `RwLock` with upgradable read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `upgradable_read` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn upgradable_read_arc(self: &Arc<Self>) -> ArcRwLockUpgradableReadGuard<R, T> {
+        self.raw.lock_upgradable();
+        // SAFETY: locking guarantee is upheld
+        unsafe { self.upgradable_guard_arc() }
+    }
+
+    /// Attempts to lock this `RwLock` with upgradable read access, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_upgradable_read` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_upgradable_read_arc(self: &Arc<Self>) -> Option<ArcRwLockUpgradableReadGuard<R, T>> {
+        if self.raw.try_lock_upgradable() {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.upgradable_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLockUpgradeTimed, T: ?Sized> RwLock<R, T> {
@@ -831,6 +1072,42 @@ impl<R: RawRwLockUpgradeTimed, T: ?Sized> RwLock<R, T> {
             None
         }
     }
+
+    /// Attempts to lock this `RwLock` with upgradable access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_upgradable_read_for` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_upgradable_read_arc_for(
+        self: &Arc<Self>,
+        timeout: R::Duration,
+    ) -> Option<ArcRwLockUpgradableReadGuard<R, T>> {
+        if self.raw.try_lock_upgradable_for(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.upgradable_guard_arc() })
+        } else {
+            None
+        }
+    }
+
+    /// Attempts to lock this `RwLock` with upgradable access until a timeout is reached, through an `Arc`.
+    /// 
+    /// This method is similar to the `try_upgradable_read_until` method; however, it requires the `RwLock` to be
+    /// inside of an `Arc` and the resulting read guard has no lifetime requirements.
+    #[cfg(feature = "arc_lock")]
+    #[inline]
+    pub fn try_upgradable_read_arc_until(
+        self: &Arc<Self>,
+        timeout: R::Instant,
+    ) -> Option<ArcRwLockUpgradableReadGuard<R, T>> {
+        if self.raw.try_lock_upgradable_until(timeout) {
+            // SAFETY: locking guarantee is upheld
+            Some(unsafe { self.upgradable_guard_arc() })
+        } else {
+            None
+        }
+    }
 }
 
 impl<R: RawRwLock, T: ?Sized + Default> Default for RwLock<R, T> {
@@ -1041,6 +1318,122 @@ impl<'a, R: RawRwLock + 'a, T: fmt::Display + ?Sized + 'a> fmt::Display
 #[cfg(feature = "owning_ref")]
 unsafe impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> StableAddress for RwLockReadGuard<'a, R, T> {}
 
+/// An RAII rwlock guard returned by the `Arc` locking operations on `RwLock`. 
+/// 
+/// This is similar to the `RwLockReadGuard` struct, except instead of using a reference to unlock the `RwLock` 
+/// it uses an `Arc<RwLock>`. This has several advantages, most notably that it has an `'static` lifetime.
+#[cfg(feature = "arc_lock")]
+#[must_use = "if unused the RwLock will immediately unlock"]
+pub struct ArcRwLockReadGuard<R: RawRwLock, T: ?Sized> {
+    rwlock: Arc<RwLock<R, T>>,
+    marker: PhantomData<R::GuardMarker>,
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> ArcRwLockReadGuard<R, T> {
+    /// Returns a reference to the rwlock, contained in its `Arc`.
+    pub fn rwlock(s: &Self) -> &Arc<RwLock<R, T>> {
+        &s.rwlock
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally identical to the `unlocked` method on [`RwLockReadGuard`].
+    #[inline]
+    pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockReadGuard always holds a shared lock.
+        unsafe {
+            s.rwlock.raw.unlock_shared();
+        }
+        defer!(s.rwlock.raw.lock_shared());
+        f()
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockFair, T: ?Sized> ArcRwLockReadGuard<R, T> {
+    /// Unlocks the `RwLock` using a fair unlock protocol.
+    ///
+    /// This is functionally identical to the `unlock_fair` method on [`RwLockReadGuard`].
+    #[inline]
+    pub fn unlock_fair(s: Self) {
+        // Safety: An RwLockReadGuard always holds a shared lock.
+        unsafe {
+            s.rwlock.raw.unlock_shared_fair();
+        }
+
+        // SAFETY: ensure the Arc has its refcount decremented
+        let mut s = ManuallyDrop::new(s);
+        unsafe { ptr::drop_in_place(&mut s.rwlock) };
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally identical to the `unlocked_fair` method on [`RwLockReadGuard`].
+    #[inline]
+    pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockReadGuard always holds a shared lock.
+        unsafe {
+            s.rwlock.raw.unlock_shared_fair();
+        }
+        defer!(s.rwlock.raw.lock_shared());
+        f()
+    }
+
+    /// Temporarily yields the `RwLock` to a waiting thread if there is one.
+    ///
+    /// This is functionally identical to the `bump` method on [`RwLockReadGuard`].
+    #[inline]
+    pub fn bump(s: &mut Self) {
+        // Safety: An RwLockReadGuard always holds a shared lock.
+        unsafe {
+            s.rwlock.raw.bump_shared();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> Deref for ArcRwLockReadGuard<R, T> {
+    type Target = T;
+    #[inline]
+    fn deref(&self) -> &T {
+        unsafe { &*self.rwlock.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> Drop for ArcRwLockReadGuard<R, T> {
+    #[inline]
+    fn drop(&mut self) {
+        // Safety: An RwLockReadGuard always holds a shared lock.
+        unsafe {
+            self.rwlock.raw.unlock_shared();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: fmt::Debug + ?Sized> fmt::Debug for ArcRwLockReadGuard<R, T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&**self, f)
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: fmt::Display + ?Sized> fmt::Display
+    for ArcRwLockReadGuard<R, T>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        (**self).fmt(f)
+    }
+}
+
 /// RAII structure used to release the exclusive write access of a lock when
 /// dropped.
 #[must_use = "if unused the RwLock will immediately unlock"]
@@ -1262,6 +1655,175 @@ impl<'a, R: RawRwLock + 'a, T: fmt::Display + ?Sized + 'a> fmt::Display
 #[cfg(feature = "owning_ref")]
 unsafe impl<'a, R: RawRwLock + 'a, T: ?Sized + 'a> StableAddress for RwLockWriteGuard<'a, R, T> {}
 
+/// An RAII rwlock guard returned by the `Arc` locking operations on `RwLock`. 
+/// This is similar to the `RwLockWriteGuard` struct, except instead of using a reference to unlock the `RwLock` 
+/// it uses an `Arc<RwLock>`. This has several advantages, most notably that it has an `'static` lifetime.
+#[cfg(feature = "arc_lock")]
+#[must_use = "if unused the RwLock will immediately unlock"]
+pub struct ArcRwLockWriteGuard<R: RawRwLock, T: ?Sized> {
+    rwlock: Arc<RwLock<R, T>>,
+    marker: PhantomData<R::GuardMarker>,
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> ArcRwLockWriteGuard<R, T> {
+    /// Returns a reference to the rwlock, contained in its `Arc`.
+    pub fn rwlock(s: &Self) -> &Arc<RwLock<R, T>> {
+        &s.rwlock
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally equivalent to the `unlocked` method on [`RwLockWriteGuard`].
+    #[inline]
+    pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockWriteGuard always holds a shared lock.
+        unsafe {
+            s.rwlock.raw.unlock_exclusive();
+        }
+        defer!(s.rwlock.raw.lock_exclusive());
+        f()
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockDowngrade, T: ?Sized> ArcRwLockWriteGuard<R, T> {
+    /// Atomically downgrades a write lock into a read lock without allowing any
+    /// writers to take exclusive access of the lock in the meantime.
+    ///
+    /// This is functionally equivalent to the `downgrade` method on [`RwLockWriteGuard`].
+    pub fn downgrade(s: Self) -> ArcRwLockReadGuard<R, T> {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            s.rwlock.raw.downgrade();
+        }
+
+        // SAFETY: prevent the arc's refcount from changing using ManuallyDrop and ptr::read
+        let s = ManuallyDrop::new(s);
+        let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+        ArcRwLockReadGuard {
+            rwlock,
+            marker: PhantomData,
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgradeDowngrade, T: ?Sized> ArcRwLockWriteGuard<R, T> {
+    /// Atomically downgrades a write lock into an upgradable read lock without allowing any
+    /// writers to take exclusive access of the lock in the meantime.
+    ///
+    /// This is functionally identical to the `downgrade_to_upgradable` method on [`RwLockWriteGuard`].
+    pub fn downgrade_to_upgradable(s: Self) -> ArcRwLockUpgradableReadGuard<R, T> {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            s.rwlock.raw.downgrade_to_upgradable();
+        }
+
+        // SAFETY: same as above
+        let s = ManuallyDrop::new(s);
+        let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+        ArcRwLockUpgradableReadGuard {
+            rwlock,
+            marker: PhantomData,
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockFair, T: ?Sized> ArcRwLockWriteGuard<R, T> {
+    /// Unlocks the `RwLock` using a fair unlock protocol.
+    ///
+    /// This is functionally equivalent to the `unlock_fair` method on [`RwLockWriteGuard`].
+    #[inline]
+    pub fn unlock_fair(s: Self) {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            s.rwlock.raw.unlock_exclusive_fair();
+        }
+
+        // SAFETY: prevent the Arc from leaking memory
+        let mut s = ManuallyDrop::new(s);
+        unsafe { ptr::drop_in_place(&mut s.rwlock) };
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally equivalent to the `unlocked_fair` method on [`RwLockWriteGuard`].
+    #[inline]
+    pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            s.rwlock.raw.unlock_exclusive_fair();
+        }
+        defer!(s.rwlock.raw.lock_exclusive());
+        f()
+    }
+
+    /// Temporarily yields the `RwLock` to a waiting thread if there is one.
+    ///
+    /// This method is functionally equivalent to the `bump` method on [`RwLockWriteGuard`]. 
+    #[inline]
+    pub fn bump(s: &mut Self) {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            s.rwlock.raw.bump_exclusive();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> Deref for ArcRwLockWriteGuard<R, T> {
+    type Target = T;
+    #[inline]
+    fn deref(&self) -> &T {
+        unsafe { &*self.rwlock.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> DerefMut for ArcRwLockWriteGuard<R, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.rwlock.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: ?Sized> Drop for ArcRwLockWriteGuard<R, T> {
+    #[inline]
+    fn drop(&mut self) {
+        // Safety: An RwLockWriteGuard always holds an exclusive lock.
+        unsafe {
+            self.rwlock.raw.unlock_exclusive();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: fmt::Debug + ?Sized> fmt::Debug for ArcRwLockWriteGuard<R, T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&**self, f)
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLock, T: fmt::Display + ?Sized> fmt::Display
+    for ArcRwLockWriteGuard<R, T>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        (**self).fmt(f)
+    }
+}
+
 /// RAII structure used to release the upgradable read access of a lock when
 /// dropped.
 #[must_use = "if unused the RwLock will immediately unlock"]
@@ -1495,6 +2057,241 @@ unsafe impl<'a, R: RawRwLockUpgrade + 'a, T: ?Sized + 'a> StableAddress
 {
 }
 
+/// An RAII rwlock guard returned by the `Arc` locking operations on `RwLock`.
+/// This is similar to the `RwLockUpgradableReadGuard` struct, except instead of using a reference to unlock the
+/// `RwLock` it uses an `Arc<RwLock>`. This has several advantages, most notably that it has an `'static` 
+/// lifetime.
+#[cfg(feature = "arc_lock")]
+#[must_use = "if unused the RwLock will immediately unlock"]
+pub struct ArcRwLockUpgradableReadGuard<R: RawRwLockUpgrade, T: ?Sized> {
+    rwlock: Arc<RwLock<R, T>>,
+    marker: PhantomData<R::GuardMarker>,
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgrade , T: ?Sized> ArcRwLockUpgradableReadGuard<R, T> {
+    /// Returns a reference to the rwlock, contained in its original `Arc`.
+    pub fn rwlock(s: &Self) -> &Arc<RwLock<R, T>> {
+        &s.rwlock
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally identical to the `unlocked` method on [`RwLockUpgradableReadGuard`].
+    #[inline]
+    pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.unlock_upgradable();
+        }
+        defer!(s.rwlock.raw.lock_upgradable());
+        f()
+    }
+
+    /// Atomically upgrades an upgradable read lock lock into a exclusive write lock,
+    /// blocking the current thread until it can be acquired.
+    pub fn upgrade(s: Self) -> ArcRwLockWriteGuard<R, T> {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.upgrade();
+        }
+
+        // SAFETY: avoid incrementing or decrementing the refcount using ManuallyDrop and reading the Arc out
+        //         of the struct
+        let s = ManuallyDrop::new(s);
+        let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+        ArcRwLockWriteGuard {
+            rwlock,
+            marker: PhantomData,
+        }
+    }
+
+    /// Tries to atomically upgrade an upgradable read lock into a exclusive write lock.
+    ///
+    /// If the access could not be granted at this time, then the current guard is returned.
+    pub fn try_upgrade(s: Self) -> Result<ArcRwLockWriteGuard<R, T>, Self> {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        if unsafe { s.rwlock.raw.try_upgrade() } {
+            // SAFETY: same as above
+            let s = ManuallyDrop::new(s);
+            let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+            Ok(ArcRwLockWriteGuard {
+                rwlock,
+                marker: PhantomData,
+            })
+        } else {
+            Err(s)
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgradeFair, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T> {
+    /// Unlocks the `RwLock` using a fair unlock protocol.
+    ///
+    /// This is functionally identical to the `unlock_fair` method on [`RwLockUpgradableReadGuard`].
+    #[inline]
+    pub fn unlock_fair(s: Self) {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.unlock_upgradable_fair();
+        }
+
+        // SAFETY: make sure we decrement the refcount properly
+        let mut s = ManuallyDrop::new(s);
+        unsafe { ptr::drop_in_place(&mut s.rwlock) }; 
+    }
+
+    /// Temporarily unlocks the `RwLock` to execute the given function.
+    ///
+    /// This is functionally equivalent to the `unlocked_fair` method on [`RwLockUpgradableReadGuard`].
+    #[inline]
+    pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
+    where
+        F: FnOnce() -> U,
+    {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.unlock_upgradable_fair();
+        }
+        defer!(s.rwlock.raw.lock_upgradable());
+        f()
+    }
+
+    /// Temporarily yields the `RwLock` to a waiting thread if there is one.
+    ///
+    /// This method is functionally equivalent to calling `bump` on [`RwLockUpgradableReadGuard`].
+    #[inline]
+    pub fn bump(s: &mut Self) {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.bump_upgradable();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgradeDowngrade, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T> {
+    /// Atomically downgrades an upgradable read lock lock into a shared read lock
+    /// without allowing any writers to take exclusive access of the lock in the
+    /// meantime.
+    ///
+    /// Note that if there are any writers currently waiting to take the lock
+    /// then other readers may not be able to acquire the lock even if it was
+    /// downgraded.
+    pub fn downgrade(s: Self) -> ArcRwLockReadGuard<R, T> {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            s.rwlock.raw.downgrade_upgradable();
+        }
+
+        // SAFETY: use ManuallyDrop and ptr::read to ensure the refcount is not changed
+        let s = ManuallyDrop::new(s);
+        let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+        ArcRwLockReadGuard {
+            rwlock,
+            marker: PhantomData,
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgradeTimed, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T> {
+    /// Tries to atomically upgrade an upgradable read lock into a exclusive
+    /// write lock, until a timeout is reached.
+    ///
+    /// If the access could not be granted before the timeout expires, then
+    /// the current guard is returned.
+    pub fn try_upgrade_for(
+        s: Self,
+        timeout: R::Duration,
+    ) -> Result<ArcRwLockWriteGuard<R, T>, Self> {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        if unsafe { s.rwlock.raw.try_upgrade_for(timeout) } {
+            // SAFETY: same as above
+            let s = ManuallyDrop::new(s);
+            let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+            Ok(ArcRwLockWriteGuard {
+                rwlock,
+                marker: PhantomData,
+            })
+        } else {
+            Err(s)
+        }
+    }
+
+    /// Tries to atomically upgrade an upgradable read lock into a exclusive
+    /// write lock, until a timeout is reached.
+    ///
+    /// If the access could not be granted before the timeout expires, then
+    /// the current guard is returned.
+    #[inline]
+    pub fn try_upgrade_until(
+        s: Self,
+        timeout: R::Instant,
+    ) -> Result<ArcRwLockWriteGuard<R, T>, Self> {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        if unsafe { s.rwlock.raw.try_upgrade_until(timeout) } {
+            // SAFETY: same as above
+            let s = ManuallyDrop::new(s);
+            let rwlock = unsafe { ptr::read(&s.rwlock) };
+
+            Ok(ArcRwLockWriteGuard {
+                rwlock,
+                marker: PhantomData,
+            })
+        } else {
+            Err(s)
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgrade, T: ?Sized> Deref for ArcRwLockUpgradableReadGuard<R, T> {
+    type Target = T;
+    #[inline]
+    fn deref(&self) -> &T {
+        unsafe { &*self.rwlock.data.get() }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgrade, T: ?Sized> Drop for ArcRwLockUpgradableReadGuard<R, T> {
+    #[inline]
+    fn drop(&mut self) {
+        // Safety: An RwLockUpgradableReadGuard always holds an upgradable lock.
+        unsafe {
+            self.rwlock.raw.unlock_upgradable();
+        }
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgrade, T: fmt::Debug + ?Sized> fmt::Debug
+    for ArcRwLockUpgradableReadGuard<R, T>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&**self, f)
+    }
+}
+
+#[cfg(feature = "arc_lock")]
+impl<R: RawRwLockUpgrade, T: fmt::Display + ?Sized> fmt::Display
+    for ArcRwLockUpgradableReadGuard<R, T>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        (**self).fmt(f)
+    }
+}
+
+
 /// An RAII read lock guard returned by `RwLockReadGuard::map`, which can point to a
 /// subfield of the protected data.
 ///