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