76 lines
1.8 KiB
Rust
76 lines
1.8 KiB
Rust
// Copyright 2013 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 container::Container;
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use option::*;
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use vec::OwnedVector;
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use unstable::sync::Exclusive;
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use cell::Cell;
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use kinds::Send;
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use clone::Clone;
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pub struct WorkQueue<T> {
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// XXX: Another mystery bug fixed by boxing this lock
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priv queue: ~Exclusive<~[T]>
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}
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impl<T: Send> WorkQueue<T> {
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pub fn new() -> WorkQueue<T> {
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WorkQueue {
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queue: ~Exclusive::new(~[])
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}
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}
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pub fn push(&mut self, value: T) {
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unsafe {
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let value = Cell::new(value);
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self.queue.with(|q| q.unshift(value.take()) );
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}
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}
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pub fn pop(&mut self) -> Option<T> {
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unsafe {
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do self.queue.with |q| {
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if !q.is_empty() {
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Some(q.shift())
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} else {
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None
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}
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}
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}
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}
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pub fn steal(&mut self) -> Option<T> {
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unsafe {
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do self.queue.with |q| {
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if !q.is_empty() {
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Some(q.pop())
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} else {
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None
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}
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}
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}
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}
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pub fn is_empty(&self) -> bool {
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unsafe {
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self.queue.with_imm(|q| q.is_empty() )
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}
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}
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}
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impl<T> Clone for WorkQueue<T> {
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fn clone(&self) -> WorkQueue<T> {
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WorkQueue {
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queue: self.queue.clone()
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}
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}
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}
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