d8450d69bb
Conflicts: src/test/bench/rt-messaging-ping-pong.rs src/test/bench/rt-parfib.rs src/test/bench/task-perf-spawnalot.rs
43 lines
1.1 KiB
Rust
43 lines
1.1 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 std::sync::mpsc::channel;
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use std::env;
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use std::thread;
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// A simple implementation of parfib. One subtree is found in a new
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// task and communicated over a oneshot pipe, the other is found
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// locally. There is no sequential-mode threshold.
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fn parfib(n: u64) -> u64 {
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if n == 0 || n == 1 {
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return 1;
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}
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let (tx, rx) = channel();
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thread::spawn(move|| {
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tx.send(parfib(n-1)).unwrap();
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});
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let m2 = parfib(n-2);
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return rx.recv().unwrap() + m2;
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}
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fn main() {
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let mut args = env::args();
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let n = if args.len() == 2 {
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args.nth(1).unwrap().parse::<u64>().unwrap()
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} else {
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10
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};
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parfib(n);
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}
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