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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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 alloc::arc::Arc;
use mpsc = std::sync::mpsc_queue;
use std::kinds::marker;
pub enum PopResult<T> {
Inconsistent,
Empty,
Data(T),
}
pub fn queue<T: Send>() -> (Consumer<T>, Producer<T>) {
let a = Arc::new(mpsc::Queue::new());
(Consumer { inner: a.clone(), noshare: marker::NoShare },
Producer { inner: a, noshare: marker::NoShare })
}
pub struct Producer<T> {
inner: Arc<mpsc::Queue<T>>,
noshare: marker::NoShare,
}
pub struct Consumer<T> {
inner: Arc<mpsc::Queue<T>>,
noshare: marker::NoShare,
}
impl<T: Send> Consumer<T> {
pub fn pop(&self) -> PopResult<T> {
match self.inner.pop() {
mpsc::Inconsistent => Inconsistent,
mpsc::Empty => Empty,
mpsc::Data(t) => Data(t),
}
}
pub fn casual_pop(&self) -> Option<T> {
match self.inner.pop() {
mpsc::Inconsistent => None,
mpsc::Empty => None,
mpsc::Data(t) => Some(t),
}
}
}
impl<T: Send> Producer<T> {
pub fn push(&self, t: T) {
self.inner.push(t);
}
}
impl<T: Send> Clone for Producer<T> {
fn clone(&self) -> Producer<T> {
Producer { inner: self.inner.clone(), noshare: marker::NoShare }
}
}
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