initial commit

.gitignore

+/target/
+**/*.rs.bk
+Cargo.lock

Cargo.toml

+[package]
+authors = ["Jorge Aparicio <jorge@japaric.io>"]
+categories = ["concurrency", "embedded", "no-std"]
+description = "Core abstractions of the Real Time For the Masses framework"
+documentation = "https://docs.rs/rtfm-core"
+keywords = []
+license = "MIT OR Apache-2.0"
+name = "rtfm-core"
+repository = "https://github.com/japaric/rtfm-core"
+version = "0.1.0"
+
+[dependencies]
+static-ref = "0.2.1"

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LICENSE-MIT

+Copyright (c) 2017 Jorge Aparicio
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
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+of the Software.
+
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+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

+[![crates.io](https://img.shields.io/crates/v/rtfm-core.svg)](https://crates.io/crates/rtfm-core)
+[![crates.io](https://img.shields.io/crates/d/rtfm-core.svg)](https://crates.io/crates/rtfm-core)
+
+# `rtfm-core`
+
+> Core abstractions of the Real Time For the Masses
+
+# [Documentation](https://docs.rs/rtfm-core)
+
+# License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  http://www.apache.org/licenses/LICENSE-2.0)
+
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.

src/lib.rs

+//! Core abstractions of the Real Time For the Masses (RTFM) framework
+//!
+//! You can write generic *libraries* by using the `Resource` trait in this
+//! crate. If you want to write application code then you'll need an
+//! implementation of the RTFM framework for a particular architecture.
+//! Currently there are implementations for these two architectures:
+//!
+//! - [ARM Cortex-M](https://crates.io/crates/cortex-m-rtfm)
+//! - [MSP430](https://crates.io/crates/msp430-rtfm)
+#![deny(missing_docs)]
+#![deny(warnings)]
+#![feature(optin_builtin_traits)]
+#![no_std]
+
+extern crate static_ref;
+
+use core::u8;
+
+pub use static_ref::Static;
+
+/// A resource, a mechanism to share data between tasks
+pub unsafe trait Resource {
+    /// The data protected by the resource
+    type Data;
+
+    /// Borrows the resource data for the duration of a critical section
+    ///
+    /// # Panics
+    ///
+    /// This will `panic!` if the threshold is not high enough to protect the
+    /// resource data from data races
+    fn borrow<'cs>(&'cs self, t: &'cs Threshold) -> &'cs Static<Self::Data>;
+
+    /// Mutable variant of `borrow`
+    fn borrow_mut<'cs>(
+        &'cs mut self,
+        t: &'cs Threshold,
+    ) -> &'cs mut Static<Self::Data>;
+
+    /// Claims the resource data for the span of the closure `f`. For the
+    /// duration of the closure other tasks that may access the resource data
+    /// are prevented from preempting the current task.
+    fn claim<R, F>(&self, t: &mut Threshold, f: F) -> R
+    where
+        F: FnOnce(&Static<Self::Data>, &mut Threshold) -> R;
+
+    /// Mutable variant of `claim`
+    fn claim_mut<R, F>(&mut self, t: &mut Threshold, f: F) -> R
+    where
+        F: FnOnce(&mut Static<Self::Data>, &mut Threshold) -> R;
+}
+
+unsafe impl<T> Resource for Static<T> {
+    type Data = T;
+
+    fn borrow<'cs>(&'cs self, _cs: &'cs Threshold) -> &'cs Static<T> {
+        self
+    }
+
+    fn borrow_mut<'cs>(
+        &'cs mut self,
+        _cs: &'cs Threshold,
+    ) -> &'cs mut Static<T> {
+        self
+    }
+
+    fn claim<R, F>(&self, t: &mut Threshold, f: F) -> R
+    where
+        F: FnOnce(&Static<Self::Data>, &mut Threshold) -> R,
+    {
+        f(self, t)
+    }
+
+    fn claim_mut<R, F>(&mut self, t: &mut Threshold, f: F) -> R
+    where
+        F: FnOnce(&mut Static<Self::Data>, &mut Threshold) -> R,
+    {
+        f(self, t)
+    }
+}
+
+/// Preemption threshold token
+///
+/// The preemption threshold indicates the priority a task must have to preempt
+/// the current context. For example a threshold of 2 indicates that only
+/// interrupts / exceptions with a priority of 3 or greater can preempt the
+/// current context
+pub struct Threshold {
+    value: u8,
+}
+
+impl Threshold {
+    /// Creates a new `Threshold` token
+    ///
+    /// This API is meant to be used to create abstractions and not to be
+    /// directly used by applications.
+    pub unsafe fn new(value: u8) -> Self {
+        Threshold { value }
+    }
+
+    /// Creates a `Threshold` token with maximum value
+    ///
+    /// This API is meant to be used to create abstractions and not to be
+    /// directly used by applications.
+    pub unsafe fn max() -> Self {
+        Self::new(u8::MAX)
+    }
+
+    /// Returns the value of this `Threshold` token
+    pub fn value(&self) -> u8 {
+        self.value
+    }
+}
+
+impl !Send for Threshold {}