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