From 595404c5ffc37ce95ffb2b6999ab85e6818bfa50 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Sun, 9 Apr 2017 22:42:17 -0500
Subject: compile time verified ceilings

---
 src/checked.rs | 78 ----------------------------------------------------------
 1 file changed, 78 deletions(-)
 delete mode 100644 src/checked.rs

(limited to 'src/checked.rs')

diff --git a/src/checked.rs b/src/checked.rs
deleted file mode 100644
index ec4114d..0000000
--- a/src/checked.rs
+++ /dev/null
@@ -1,78 +0,0 @@
-//! Safe, run-time checked resources
-
-use core::marker::PhantomData;
-use core::cell::UnsafeCell;
-
-use cortex_m::interrupt;
-use cortex_m::register::{basepri, basepri_max};
-use vcell::VolatileCell;
-
-use Ceiling;
-
-unsafe fn acquire(locked: &VolatileCell<bool>, ceiling: u8) -> u8 {
-    assert!(!locked.get(), "resource already locked");
-    let old_basepri = basepri::read();
-    basepri_max::write(ceiling);
-    locked.set(true);
-    old_basepri
-}
-
-unsafe fn release(locked: &VolatileCell<bool>, old_basepri: u8) {
-    locked.set(false);
-    basepri::write(old_basepri);
-}
-
-/// A totally safe `Resource` that panics on misuse
-pub struct Resource<T, C> {
-    _marker: PhantomData<C>,
-    data: UnsafeCell<T>,
-    locked: VolatileCell<bool>,
-}
-
-impl<T, C> Resource<T, C>
-where
-    C: Ceiling,
-{
-    /// Creates a new `Resource` with ceiling `C`
-    pub const fn new(data: T) -> Resource<T, C> {
-        Resource {
-            _marker: PhantomData,
-            data: UnsafeCell::new(data),
-            locked: VolatileCell::new(false),
-        }
-    }
-
-    /// Locks the resource, blocking tasks with priority equal or smaller than
-    /// the ceiling `C`
-    pub fn lock<R, F>(&'static self, f: F) -> R
-    where
-        F: FnOnce(&T) -> R,
-    {
-        unsafe {
-            let old_basepri = acquire(&self.locked, C::hw_ceiling());
-            ::compiler_barrier();
-            let ret = f(&*self.data.get());
-            ::compiler_barrier();
-            release(&self.locked, old_basepri);
-            ret
-        }
-    }
-
-    /// Mutably locks the resource, blocking tasks with priority equal or
-    /// smaller than the ceiling `C`
-    pub fn lock_mut<R, F>(&'static self, f: F) -> R
-    where
-        F: FnOnce(&mut T) -> R,
-    {
-        unsafe {
-            let old_basepri = acquire(&self.locked, C::hw_ceiling());
-            ::compiler_barrier();
-            let ret = f(&mut *self.data.get());
-            ::compiler_barrier();
-            release(&self.locked, old_basepri);
-            ret
-        }
-    }
-}
-
-unsafe impl<T, C> Sync for Resource<T, C> {}
-- 
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