diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/export.rs | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/src/export.rs b/src/export.rs index ed40b621..6eae65f2 100644 --- a/src/export.rs +++ b/src/export.rs @@ -39,6 +39,31 @@ where f(); } +// Newtype over `Cell` that forbids mutation through a shared reference +pub struct Priority { + inner: Cell<u8>, +} + +impl Priority { + #[inline(always)] + pub unsafe fn new(value: u8) -> Self { + Priority { + inner: Cell::new(value), + } + } + + // these two methods are used by claim (see below) but can't be used from the RTFM application + #[inline(always)] + fn set(&self, value: u8) { + self.inner.set(value) + } + + #[inline(always)] + fn get(&self) -> u8 { + self.inner.get() + } +} + // TODO(MaybeUninit) Until core::mem::MaybeUninit is stabilized we use our own (inefficient) // implementation pub struct MaybeUninit<T> { @@ -102,7 +127,7 @@ where #[inline(always)] pub unsafe fn claim<T, R, F>( ptr: *mut T, - priority: &Cell<u8>, + priority: &Priority, ceiling: u8, nvic_prio_bits: u8, f: F, @@ -135,7 +160,7 @@ where #[inline(always)] pub unsafe fn claim<T, R, F>( ptr: *mut T, - priority: &Cell<u8>, + priority: &Priority, ceiling: u8, _nvic_prio_bits: u8, f: F, |