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December 21, 2015 03:48
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Playing around w/ trying to implement multicast.
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use std::task; | |
use std::task::TaskBuilder; | |
enum MultiCastMsgChan<T> { | |
Msg(T), | |
MsgChan(Chan<T>) | |
} | |
struct MultiCast<T> { | |
priv ch: Chan<MultiCastMsgChan<T>>, | |
} | |
impl<T:Send+Clone> MultiCast<T> { | |
fn new() -> MultiCast<T> { | |
let (po, ch) = stream::<MultiCastMsgChan<T>>(); | |
do named_task(~"mc").spawn { | |
let mut chans: ~[Chan<T>] = ~[]; | |
loop { | |
match po.try_recv() { | |
Some(Msg(msg)) => { | |
for c in chans.iter() { | |
c.send(msg.clone()); | |
} | |
} | |
Some(MsgChan(ch)) => { | |
chans.push(ch); | |
} | |
None => break | |
} | |
} | |
} | |
MultiCast { ch: ch } | |
} | |
fn send(&self, msg: T) { | |
self.ch.send(Msg(msg)); | |
} | |
fn push(&self, ch: Chan<T>) { | |
self.ch.send(MsgChan(ch)); | |
} | |
} | |
pub fn named_task(name: ~str) -> TaskBuilder { | |
let mut ui_task = task::task(); | |
ui_task.name(name); | |
ui_task | |
} | |
pub fn do_something(name: ~str, po: Port<int>) { | |
do named_task(name.clone()).spawn { | |
loop { | |
match po.try_recv() { | |
Some(i) => printfln!("%s got %i", name, i), | |
None => break | |
} | |
} | |
} | |
} | |
fn main() { | |
let (po0, ch0) = stream(); | |
let (po1, ch1) = stream(); | |
let (po2, ch2) = stream(); | |
do_something(~"po0", po0); | |
do_something(~"po1", po1); | |
do_something(~"po2", po2); | |
let mc = MultiCast::new(); | |
mc.push(ch0); | |
mc.push(ch1); | |
for i in range(1, 5) { | |
mc.send(i) | |
} | |
mc.push(ch2); | |
for i in range(5, 10) { | |
mc.send(i) | |
} | |
} |
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Fixed up w/ help from @kballard: https://gist.github.com/kballard/6244625