75 lines
1.8 KiB
Rust
75 lines
1.8 KiB
Rust
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// Copyright 2012 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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// Based on threadring.erlang by Jira Isa
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fn start(n_tasks: int, token: int) {
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let mut (p, ch1) = comm::stream();
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ch1.send(token);
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// XXX could not get this to work with a range closure
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let mut i = 2;
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while i <= n_tasks {
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let (next_p, ch) = comm::stream();
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let imm_i = i;
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let imm_p = p;
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do task::spawn {
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roundtrip(imm_i, n_tasks, &imm_p, &ch);
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};
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p = next_p;
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i += 1;
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}
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let imm_p = p;
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let imm_ch = ch1;
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do task::spawn {
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roundtrip(1, n_tasks, &imm_p, &imm_ch);
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}
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}
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fn roundtrip(id: int, n_tasks: int, p: &comm::Port<int>, ch: &comm::Chan<int>) {
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while (true) {
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match p.recv() {
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1 => {
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io::println(fmt!("%d\n", id));
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return;
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}
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token => {
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debug!("thread: %d got token: %d", id, token);
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ch.send(token - 1);
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if token <= n_tasks {
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return;
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}
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}
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}
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}
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}
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fn main() {
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let args = if os::getenv(~"RUST_BENCH").is_some() {
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~[~"", ~"2000000", ~"503"]
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}
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else {
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os::args()
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};
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let token = if args.len() > 1u {
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int::from_str(args[1]).get()
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}
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else {
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1000
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};
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let n_tasks = if args.len() > 2u {
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int::from_str(args[2]).get()
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}
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else {
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503
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};
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start(n_tasks, token);
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}
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