1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use std::sync::mpsc::channel;
15 // A simple implementation of parfib. One subtree is found in a new
16 // thread and communicated over a oneshot pipe, the other is found
17 // locally. There is no sequential-mode threshold.
19 fn parfib(n: u64) -> u64 {
24 let (tx, rx) = channel();
25 thread::spawn(move|| {
26 tx.send(parfib(n-1)).unwrap();
29 return rx.recv().unwrap() + m2;
33 let mut args = env::args();
34 let n = if args.len() == 2 {
35 args.nth(1).unwrap().parse::<u64>().unwrap()