Created
June 28, 2015 13:18
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use std::char; | |
use std::collections::HashMap; | |
use std::sync::{Arc, Barrier}; | |
use std::sync::mpsc::{Sender, channel}; | |
use std::thread; | |
const NTHREADS: u32 = 5; | |
fn slow(n: u32) -> char { | |
thread::sleep_ms(n); | |
let chr = char::from_u32(n % 26 + 65).unwrap(); | |
chr | |
} | |
fn main() { | |
println!("[start]"); | |
// poor man's actor | |
let (mem_tx, mem_rx) = channel::<(u32, Sender<char>)>(); | |
thread::spawn(move|| { | |
let mut mem = HashMap::new(); | |
for (n, tx) in mem_rx.iter() { | |
let chr = *mem.entry(n).or_insert_with(|| { slow(n) }); | |
tx.send(chr).unwrap(); | |
} | |
}); | |
for pass in 0..3 { | |
let barrier = Arc::new(Barrier::new((NTHREADS as usize) + 1)); | |
for i in 0..NTHREADS { | |
let n = (i + 1) * 500; | |
let bc = barrier.clone(); | |
let mem_txc = mem_tx.clone(); | |
thread::spawn(move|| { | |
let (tx, rx) = channel::<char>(); | |
mem_txc.send((n, tx)).unwrap(); | |
let chr = rx.recv().unwrap(); | |
println!("pass {}: slow({}) = {}", pass, n, chr); | |
bc.wait(); | |
println!("[thread {} about to end]", i); | |
}); | |
} | |
barrier.wait(); | |
} | |
println!("[main end]"); | |
} |
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