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