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// Test for concurrent tasks
enum msg {
ready(comm::chan<msg>),
start,
done(int),
}
fn calc(children: uint, parent_ch: comm::chan<msg>) {
let port = comm::port();
let chan = comm::chan(port);
let mut child_chs = ~[];
let mut sum = 0;
for iter::repeat (children) {
do task::spawn {
calc(0u, chan);
};
}
for iter::repeat (children) {
alt check comm::recv(port) {
ready(child_ch) {
vec::push(child_chs, child_ch);
}
}
}
comm::send(parent_ch, ready(chan));
alt check comm::recv(port) {
start {
do vec::iter (child_chs) |child_ch| {
comm::send(child_ch, start);
}
}
}
for iter::repeat (children) {
alt check comm::recv(port) {
done(child_sum) { sum += child_sum; }
}
}
comm::send(parent_ch, done(sum + 1));
}
fn main(args: ~[str]) {
let args = if os::getenv("RUST_BENCH").is_some() {
~["", "100000"]
} else if args.len() <= 1u {
~["", "100"]
} else {
args
};
let children = uint::from_str(args[1]).get();
let port = comm::port();
let chan = comm::chan(port);
do task::spawn {
calc(children, chan);
};
alt check comm::recv(port) {
ready(chan) {
comm::send(chan, start);
}
}
let sum = alt check comm::recv(port) {
done(sum) { sum }
};
#error("How many tasks? %d tasks.", sum);
}
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