1 files changed, 140 insertions, 0 deletions
diff --git a/vendor/sharded-slab/src/sync.rs b/vendor/sharded-slab/src/sync.rs
new file mode 100644
index 000000000..64a31dcd9
--- /dev/null
+++ b/vendor/sharded-slab/src/sync.rs
@@ -0,0 +1,140 @@
+pub(crate) use self::inner::*;
+
+#[cfg(all(loom, any(test, feature = "loom")))]
+mod inner {
+    pub(crate) mod atomic {
+        pub use loom::sync::atomic::*;
+        pub use std::sync::atomic::Ordering;
+    }
+    pub(crate) use loom::{
+        cell::UnsafeCell, hint, lazy_static, sync::Mutex, thread::yield_now, thread_local,
+    };
+
+    pub(crate) mod alloc {
+        #![allow(dead_code)]
+        use loom::alloc;
+        use std::fmt;
+        /// Track allocations, detecting leaks
+        ///
+        /// This is a version of `loom::alloc::Track` that adds a missing
+        /// `Default` impl.
+        pub struct Track<T>(alloc::Track<T>);
+
+        impl<T> Track<T> {
+            /// Track a value for leaks
+            #[inline(always)]
+            pub fn new(value: T) -> Track<T> {
+                Track(alloc::Track::new(value))
+            }
+
+            /// Get a reference to the value
+            #[inline(always)]
+            pub fn get_ref(&self) -> &T {
+                self.0.get_ref()
+            }
+
+            /// Get a mutable reference to the value
+            #[inline(always)]
+            pub fn get_mut(&mut self) -> &mut T {
+                self.0.get_mut()
+            }
+
+            /// Stop tracking the value for leaks
+            #[inline(always)]
+            pub fn into_inner(self) -> T {
+                self.0.into_inner()
+            }
+        }
+
+        impl<T: fmt::Debug> fmt::Debug for Track<T> {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                self.0.fmt(f)
+            }
+        }
+
+        impl<T: Default> Default for Track<T> {
+            fn default() -> Self {
+                Self::new(T::default())
+            }
+        }
+    }
+}
+
+#[cfg(not(all(loom, any(feature = "loom", test))))]
+mod inner {
+    #![allow(dead_code)]
+    pub(crate) use lazy_static::lazy_static;
+    pub(crate) use std::{
+        sync::{atomic, Mutex},
+        thread::yield_now,
+        thread_local,
+    };
+
+    pub(crate) mod hint {
+        #[inline(always)]
+        pub(crate) fn spin_loop() {
+            // MSRV: std::hint::spin_loop() stabilized in 1.49.0
+            #[allow(deprecated)]
+            super::atomic::spin_loop_hint()
+        }
+    }
+
+    #[derive(Debug)]
+    pub(crate) struct UnsafeCell<T>(std::cell::UnsafeCell<T>);
+
+    impl<T> UnsafeCell<T> {
+        pub fn new(data: T) -> UnsafeCell<T> {
+            UnsafeCell(std::cell::UnsafeCell::new(data))
+        }
+
+        #[inline(always)]
+        pub fn with<F, R>(&self, f: F) -> R
+        where
+            F: FnOnce(*const T) -> R,
+        {
+            f(self.0.get())
+        }
+
+        #[inline(always)]
+        pub fn with_mut<F, R>(&self, f: F) -> R
+        where
+            F: FnOnce(*mut T) -> R,
+        {
+            f(self.0.get())
+        }
+    }
+
+    pub(crate) mod alloc {
+        /// Track allocations, detecting leaks
+        #[derive(Debug, Default)]
+        pub struct Track<T> {
+            value: T,
+        }
+
+        impl<T> Track<T> {
+            /// Track a value for leaks
+            #[inline(always)]
+            pub fn new(value: T) -> Track<T> {
+                Track { value }
+            }
+
+            /// Get a reference to the value
+            #[inline(always)]
+            pub fn get_ref(&self) -> &T {
+                &self.value
+            }
+
+            /// Get a mutable reference to the value
+            #[inline(always)]
+            pub fn get_mut(&mut self) -> &mut T {
+                &mut self.value
+            }
+
+            /// Stop tracking the value for leaks
+            #[inline(always)]
+            pub fn into_inner(self) -> T {
+                self.value
+            }
+        }
+    }
+}