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// Based on threadring.erlang by Jira Isa
extern mod std;
const n_threads: int = 503;
fn start(+token: int) {
use iter::*;
let p = comm::Port();
let mut ch = comm::Chan(&p);
for int::range(2, n_threads + 1) |i| {
let id = n_threads + 2 - i;
let to_child = do task::spawn_listener::<int> |p, copy ch| {
roundtrip(id, p, ch)
};
ch = to_child;
}
comm::send(ch, token);
roundtrip(1, p, ch);
}
fn roundtrip(id: int, p: comm::Port<int>, ch: comm::Chan<int>) {
while (true) {
match comm::recv(p) {
1 => {
io::println(fmt!("%d\n", id));
return;
}
token => {
debug!("%d %d", id, token);
comm::send(ch, token - 1);
if token <= n_threads {
return;
}
}
}
}
}
fn main() {
let args = os::args();
let args = if os::getenv(~"RUST_BENCH").is_some() {
~[~"", ~"2000000"]
} else if args.len() <= 1u {
~[~"", ~"1000"]
} else {
args
};
let token = int::from_str(args[1]).get();
start(token);
}
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