Split embassy-time from embassy-executor.

embassy-executor/src/raw/util.rs

@@ -0,0 +1,33 @@
+use core::cell::UnsafeCell;
+use core::mem::MaybeUninit;
+use core::ptr;
+
+pub(crate) struct UninitCell<T>(MaybeUninit<UnsafeCell<T>>);
+impl<T> UninitCell<T> {
+    pub const fn uninit() -> Self {
+        Self(MaybeUninit::uninit())
+    }
+
+    pub unsafe fn as_mut_ptr(&self) -> *mut T {
+        (*self.0.as_ptr()).get()
+    }
+
+    #[allow(clippy::mut_from_ref)]
+    pub unsafe fn as_mut(&self) -> &mut T {
+        &mut *self.as_mut_ptr()
+    }
+
+    pub unsafe fn write(&self, val: T) {
+        ptr::write(self.as_mut_ptr(), val)
+    }
+
+    pub unsafe fn drop_in_place(&self) {
+        ptr::drop_in_place(self.as_mut_ptr())
+    }
+}
+
+impl<T: Copy> UninitCell<T> {
+    pub unsafe fn read(&self) -> T {
+        ptr::read(self.as_mut_ptr())
+    }
+}