c32d03f417
This commit is an implementation of [RFC 503][rfc] which is a stabilization story for the prelude. Most of the RFC was directly applied, removing reexports. Some reexports are kept around, however: * `range` remains until range syntax has landed to reduce churn. * `Path` and `GenericPath` remain until path reform lands. This is done to prevent many imports of `GenericPath` which will soon be removed. * All `io` traits remain until I/O reform lands so imports can be rewritten all at once to `std::io::prelude::*`. This is a breaking change because many prelude reexports have been removed, and the RFC can be consulted for the exact list of removed reexports, as well as to find the locations of where to import them. [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md [breaking-change] Closes #20068
79 lines
2.8 KiB
Rust
79 lines
2.8 KiB
Rust
// The Computer Language Benchmarks Game
|
|
// http://benchmarksgame.alioth.debian.org/
|
|
//
|
|
// contributed by the Rust Project Developers
|
|
|
|
// Copyright (c) 2012-2014 The Rust Project Developers
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions
|
|
// are met:
|
|
//
|
|
// - Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
//
|
|
// - Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in
|
|
// the documentation and/or other materials provided with the
|
|
// distribution.
|
|
//
|
|
// - Neither the name of "The Computer Language Benchmarks Game" nor
|
|
// the name of "The Computer Language Shootout Benchmarks" nor the
|
|
// names of its contributors may be used to endorse or promote
|
|
// products derived from this software without specific prior
|
|
// written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
// OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
use std::comm::{channel, Sender, Receiver};
|
|
use std::str::from_str;
|
|
use std::thread::Thread;
|
|
|
|
fn start(n_tasks: int, token: int) {
|
|
let (tx, mut rx) = channel();
|
|
tx.send(token);
|
|
for i in range(2, n_tasks + 1) {
|
|
let (tx, next_rx) = channel();
|
|
Thread::spawn(move|| roundtrip(i, tx, rx)).detach();
|
|
rx = next_rx;
|
|
}
|
|
Thread::spawn(move|| roundtrip(1, tx, rx)).detach();
|
|
}
|
|
|
|
fn roundtrip(id: int, tx: Sender<int>, rx: Receiver<int>) {
|
|
for token in rx.iter() {
|
|
if token == 1 {
|
|
println!("{}", id);
|
|
break;
|
|
}
|
|
tx.send(token - 1);
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let args = std::os::args();
|
|
let args = args.as_slice();
|
|
let token = if std::os::getenv("RUST_BENCH").is_some() {
|
|
2000000
|
|
} else {
|
|
args.get(1).and_then(|arg| from_str(arg.as_slice())).unwrap_or(1000)
|
|
};
|
|
let n_tasks = args.get(2)
|
|
.and_then(|arg| from_str(arg.as_slice()))
|
|
.unwrap_or(503);
|
|
|
|
start(n_tasks, token);
|
|
}
|