67deb2e65e
of `use bar as foo`. Change all uses of `use foo = bar` to `use bar as foo`. Implements RFC #47. Closes #16461. [breaking-change]
66 lines
1.7 KiB
Rust
66 lines
1.7 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use alloc::arc::Arc;
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use std::sync::mpsc_queue as mpsc;
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use std::kinds::marker;
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pub enum PopResult<T> {
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Inconsistent,
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Empty,
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Data(T),
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}
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pub fn queue<T: Send>() -> (Consumer<T>, Producer<T>) {
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let a = Arc::new(mpsc::Queue::new());
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(Consumer { inner: a.clone(), noshare: marker::NoSync },
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Producer { inner: a, noshare: marker::NoSync })
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}
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pub struct Producer<T> {
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inner: Arc<mpsc::Queue<T>>,
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noshare: marker::NoSync,
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}
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pub struct Consumer<T> {
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inner: Arc<mpsc::Queue<T>>,
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noshare: marker::NoSync,
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}
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impl<T: Send> Consumer<T> {
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pub fn pop(&self) -> PopResult<T> {
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match self.inner.pop() {
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mpsc::Inconsistent => Inconsistent,
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mpsc::Empty => Empty,
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mpsc::Data(t) => Data(t),
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}
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}
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pub fn casual_pop(&self) -> Option<T> {
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match self.inner.pop() {
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mpsc::Inconsistent => None,
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mpsc::Empty => None,
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mpsc::Data(t) => Some(t),
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}
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}
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}
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impl<T: Send> Producer<T> {
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pub fn push(&self, t: T) {
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self.inner.push(t);
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}
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}
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impl<T: Send> Clone for Producer<T> {
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fn clone(&self) -> Producer<T> {
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Producer { inner: self.inner.clone(), noshare: marker::NoSync }
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}
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}
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