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/* Copyright 2016 Joshua Gentry * * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or * http://www.apache.org/licenses/LICENSE-2.0> or the MIT license * <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your * option. This file may not be copied, modified, or distributed * except according to those terms. */ use std::sync::Arc; use std::sync::atomic::{AtomicUsize, Ordering}; //************************************************************************************************* /// Shareable u8 data element. /// /// # Examples /// /// ``` /// use std::sync::mpsc; /// use std::thread; /// use shareable::SharedU8; /// /// // Multiple threads, atomic values are used. /// let value1 = SharedU8::new(63); /// let value2 = value1.clone(); /// /// let (tx, rx) = mpsc::channel(); /// /// let thread = thread::spawn(move || { /// rx.recv(); /// assert_eq!(value2.get(), 31); /// }); /// /// value1.set(31); /// /// tx.send(()); /// thread.join().unwrap(); /// ``` #[derive(Clone)] pub struct SharedU8 { //--------------------------------------------------------------------------------------------- /// The internal data element. data : Arc<AtomicUsize> } impl SharedU8 { //******************************************************************************************** /// Construct a new instance of the object. pub fn new( value : u8 ) -> SharedU8 { SharedU8 { data : Arc::new(AtomicUsize::new(value as usize)) } } //******************************************************************************************** /// Set the value of the object. pub fn set( &self, value : u8 ) { self.data.store(value as usize, Ordering::Relaxed); } //******************************************************************************************** /// Returns the value of the object. pub fn get(&self) -> u8 { self.data.load(Ordering::Relaxed) as u8 } } use std::fmt::{Debug, Display, Formatter, Error}; impl Debug for SharedU8 { //********************************************************************************************* /// Implementation of Debug. fn fmt( &self, f : &mut Formatter ) -> Result<(), Error> { write!(f, "{:?}", self.get()) } } impl Display for SharedU8 { //********************************************************************************************* /// Implementation of Display. fn fmt( &self, f : &mut Formatter ) -> Result<(), Error> { write!(f, "{}", self.get()) } } #[cfg(test)] mod tests { //********************************************************************************************* /// Test that get/set work with only 1 instance. #[test] fn test_single() { let test = super::SharedU8::new(79); assert_eq!(test.get(), 79); test.set(41); assert_eq!(test.get(), 41); } //********************************************************************************************* /// Test that get/set work with multiple instances. #[test] fn test_multiple() { let test1 = super::SharedU8::new(79); let test2 = test1.clone(); let test3 = test2.clone(); assert_eq!(test1.get(), 79); assert_eq!(test2.get(), 79); assert_eq!(test3.get(), 79); test1.set(51); assert_eq!(test1.get(), 51); assert_eq!(test2.get(), 51); assert_eq!(test3.get(), 51); test2.set(31); assert_eq!(test1.get(), 31); assert_eq!(test2.get(), 31); assert_eq!(test3.get(), 31); test3.set(11); assert_eq!(test1.get(), 11); assert_eq!(test2.get(), 11); assert_eq!(test3.get(), 11); } }