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/target/
**/*.rs.bk
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[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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Copyright (c) 2017 Jorge Aparicio
Permission is hereby granted, free of charge, to any
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DEALINGS IN THE SOFTWARE.
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[![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.
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//! 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 {}
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