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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Based on threadring.erlang by Jira Isa
use std::os;
fn start(n_tasks: int, token: int) {
let (tx, mut rx) = channel();
tx.send(token);
// XXX could not get this to work with a range closure
let mut i = 2;
while i <= n_tasks {
let (tx, next_rx) = channel();
let imm_i = i;
let imm_rx = rx;
spawn(proc() {
roundtrip(imm_i, n_tasks, &imm_rx, &tx);
});
rx = next_rx;
i += 1;
}
let imm_rx = rx;
spawn(proc() {
roundtrip(1, n_tasks, &imm_rx, &tx);
});
}
fn roundtrip(id: int, n_tasks: int, p: &Receiver<int>, ch: &Sender<int>) {
loop {
match p.recv() {
1 => {
println!("{}\n", id);
return;
}
token => {
println!("thread: {} got token: {}", id, token);
ch.send(token - 1);
if token <= n_tasks {
return;
}
}
}
}
}
fn main() {
use std::from_str::FromStr;
let args = if os::getenv("RUST_BENCH").is_some() {
vec!(~"", ~"2000000", ~"503")
} else {
os::args().move_iter().collect()
};
let token = if args.len() > 1u {
FromStr::from_str(*args.get(1)).unwrap()
}
else {
1000
};
let n_tasks = if args.len() > 2u {
FromStr::from_str(*args.get(2)).unwrap()
}
else {
503
};
start(n_tasks, token);
}
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