Goodbye static mut

1 files changed, 28 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index a4abc4c8..cd511996 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,3 +57,31 @@ where
 {
     NVIC::pend(interrupt)
 }
+
+use core::cell::UnsafeCell;
+
+/// Internal replacement for `static mut T`
+#[repr(transparent)]
+pub struct RacyCell<T>(UnsafeCell<T>);
+
+impl<T> RacyCell<T> {
+    /// Create a RacyCell
+    #[inline(always)]
+    pub const fn new(value: T) -> Self {
+        RacyCell(UnsafeCell::new(value))
+    }
+
+    /// Get `&mut T`
+    #[inline(always)]
+    pub unsafe fn get_mut_unchecked(&self) -> &mut T {
+        &mut *self.0.get()
+    }
+
+    /// Get `&T`
+    #[inline(always)]
+    pub unsafe fn get_unchecked(&self) -> &T {
+        &*self.0.get()
+    }
+}
+
+unsafe impl<T> Sync for RacyCell<T> {}