| // Copyright 2015 Colin Sherratt |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| extern crate atom; |
| |
| use atom::*; |
| use std::sync::atomic::AtomicUsize; |
| use std::sync::atomic::Ordering; |
| use std::sync::*; |
| use std::thread; |
| |
| #[test] |
| fn swap() { |
| let a = Atom::empty(); |
| assert_eq!(a.swap(Box::new(1u8)), None); |
| assert_eq!(a.swap(Box::new(2u8)), Some(Box::new(1u8))); |
| assert_eq!(a.swap(Box::new(3u8)), Some(Box::new(2u8))); |
| } |
| |
| #[test] |
| fn take() { |
| let a = Atom::new(Box::new(7u8)); |
| assert_eq!(a.take(), Some(Box::new(7))); |
| assert_eq!(a.take(), None); |
| } |
| |
| #[test] |
| fn set_if_none() { |
| let a = Atom::empty(); |
| assert_eq!(a.set_if_none(Box::new(7u8)), None); |
| assert_eq!(a.set_if_none(Box::new(8u8)), Some(Box::new(8u8))); |
| } |
| |
| #[derive(Clone)] |
| struct Canary(Arc<AtomicUsize>); |
| |
| impl Drop for Canary { |
| fn drop(&mut self) { |
| self.0.fetch_add(1, Ordering::SeqCst); |
| } |
| } |
| |
| #[test] |
| fn ensure_drop() { |
| let v = Arc::new(AtomicUsize::new(0)); |
| let a = Box::new(Canary(v.clone())); |
| let a = Atom::new(a); |
| assert_eq!(v.load(Ordering::SeqCst), 0); |
| drop(a); |
| assert_eq!(v.load(Ordering::SeqCst), 1); |
| } |
| |
| #[test] |
| fn ensure_drop_arc() { |
| let v = Arc::new(AtomicUsize::new(0)); |
| let a = Arc::new(Canary(v.clone())); |
| let a = Atom::new(a); |
| assert_eq!(v.load(Ordering::SeqCst), 0); |
| drop(a); |
| assert_eq!(v.load(Ordering::SeqCst), 1); |
| } |
| |
| #[test] |
| fn ensure_send() { |
| let atom = Arc::new(Atom::empty()); |
| let wait = Arc::new(Barrier::new(2)); |
| |
| let w = wait.clone(); |
| let a = atom.clone(); |
| thread::spawn(move || { |
| a.swap(Box::new(7u8)); |
| w.wait(); |
| }); |
| |
| wait.wait(); |
| assert_eq!(atom.take(), Some(Box::new(7u8))); |
| } |
| |
| #[test] |
| fn get() { |
| let atom = Arc::new(AtomSetOnce::empty()); |
| assert_eq!(atom.get(), None); |
| assert_eq!(atom.set_if_none(Box::new(8u8)), None); |
| assert_eq!(atom.get(), Some(&8u8)); |
| } |
| |
| #[test] |
| fn get_arc() { |
| let atom = Arc::new(AtomSetOnce::empty()); |
| assert_eq!(atom.get(), None); |
| assert_eq!(atom.set_if_none(Arc::new(8u8)), None); |
| assert_eq!(atom.get(), Some(&8u8)); |
| |
| let v = Arc::new(AtomicUsize::new(0)); |
| let atom = Arc::new(AtomSetOnce::empty()); |
| atom.get(); |
| atom.set_if_none(Arc::new(Canary(v.clone()))); |
| atom.get(); |
| drop(atom); |
| |
| assert_eq!(v.load(Ordering::SeqCst), 1); |
| } |
| |
| #[derive(Debug)] |
| struct Link { |
| next: Option<Box<Link>>, |
| value: u32, |
| } |
| |
| impl Link { |
| fn new(v: u32) -> Box<Link> { |
| Box::new(Link { |
| next: None, |
| value: v, |
| }) |
| } |
| } |
| |
| impl GetNextMut for Box<Link> { |
| type NextPtr = Option<Box<Link>>; |
| fn get_next(&mut self) -> &mut Option<Box<Link>> { |
| &mut self.next |
| } |
| } |
| |
| #[test] |
| fn lifo() { |
| let atom = Atom::empty(); |
| for i in 0..100 { |
| let x = atom.replace_and_set_next(Link::new(99 - i)); |
| assert_eq!(x, i == 0); |
| } |
| |
| let expected: Vec<u32> = (0..100).collect(); |
| let mut found = Vec::new(); |
| let mut chain = atom.take(); |
| while let Some(v) = chain { |
| found.push(v.value); |
| chain = v.next; |
| } |
| assert_eq!(expected, found); |
| } |
| |
| #[allow(dead_code)] |
| struct LinkCanary { |
| next: Option<Box<LinkCanary>>, |
| value: Canary, |
| } |
| |
| impl LinkCanary { |
| fn new(v: Canary) -> Box<LinkCanary> { |
| Box::new(LinkCanary { |
| next: None, |
| value: v, |
| }) |
| } |
| } |
| |
| impl GetNextMut for Box<LinkCanary> { |
| type NextPtr = Option<Box<LinkCanary>>; |
| fn get_next(&mut self) -> &mut Option<Box<LinkCanary>> { |
| &mut self.next |
| } |
| } |
| |
| #[test] |
| fn lifo_drop() { |
| let v = Arc::new(AtomicUsize::new(0)); |
| let canary = Canary(v.clone()); |
| let mut link = LinkCanary::new(canary.clone()); |
| link.next = Some(LinkCanary::new(canary.clone())); |
| |
| let atom = Atom::empty(); |
| atom.replace_and_set_next(link); |
| assert_eq!(1, v.load(Ordering::SeqCst)); |
| drop(atom); |
| assert_eq!(2, v.load(Ordering::SeqCst)); |
| } |