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// Copyright 2012-2014 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.
// Test for concurrent tasks
// ignore-test OOM on linux-32 without opts
use std::os;
use std::task;
use std::uint;
use std::slice;
fn calc(children: uint, parent_wait_chan: &Sender<Sender<Sender<int>>>) {
let wait_ports: Vec<Reciever<Sender<Sender<int>>>> = vec::from_fn(children, |_| {
let (wait_port, wait_chan) = stream::<Sender<Sender<int>>>();
task::spawn(proc() {
calc(children / 2, &wait_chan);
});
wait_port
});
let child_start_chans: Vec<Sender<Sender<int>>> =
wait_ports.into_iter().map(|port| port.recv()).collect();
let (start_port, start_chan) = stream::<Sender<int>>();
parent_wait_chan.send(start_chan);
let parent_result_chan: Sender<int> = start_port.recv();
let child_sum_ports: Vec<Reciever<int>> =
child_start_chans.into_iter().map(|child_start_chan| {
let (child_sum_port, child_sum_chan) = stream::<int>();
child_start_chan.send(child_sum_chan);
child_sum_port
}).collect();
let sum = child_sum_ports.into_iter().fold(0, |sum, sum_port| sum + sum_port.recv() );
parent_result_chan.send(sum + 1);
}
fn main() {
let args = os::args();
let args = if os::getenv("RUST_BENCH").is_some() {
vec!("".to_string(), "30".to_string())
} else if args.len() <= 1u {
vec!("".to_string(), "10".to_string())
} else {
args
};
let children = from_str::<uint>(args[1]).unwrap();
let (wait_port, wait_chan) = stream();
task::spawn(proc() {
calc(children, &wait_chan);
});
let start_chan = wait_port.recv();
let (sum_port, sum_chan) = stream::<int>();
start_chan.send(sum_chan);
let sum = sum_port.recv();
println!("How many tasks? {} tasks.", sum);
}
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