95 lines
2.7 KiB
Rust
95 lines
2.7 KiB
Rust
// run-pass
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#![allow(non_camel_case_types)]
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#![allow(dead_code)]
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#![allow(unused_mut)]
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// ignore-emscripten No support for threads
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/**
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A somewhat reduced test case to expose some Valgrind issues.
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This originally came from the word-count benchmark.
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*/
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pub fn map(filename: String, mut emit: map_reduce::putter) {
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emit(filename, "1".to_string());
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}
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mod map_reduce {
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use std::collections::HashMap;
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use std::sync::mpsc::{channel, Sender};
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use std::str;
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use std::thread;
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pub type putter<'a> = Box<dyn FnMut(String, String) + 'a>;
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pub type mapper = extern fn(String, putter);
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enum ctrl_proto { find_reducer(Vec<u8>, Sender<isize>), mapper_done, }
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fn start_mappers(ctrl: Sender<ctrl_proto>, inputs: Vec<String>) {
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for i in &inputs {
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let ctrl = ctrl.clone();
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let i = i.clone();
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thread::spawn(move|| map_task(ctrl.clone(), i.clone()) );
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}
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}
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fn map_task(ctrl: Sender<ctrl_proto>, input: String) {
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let mut intermediates = HashMap::new();
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fn emit(im: &mut HashMap<String, isize>,
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ctrl: Sender<ctrl_proto>, key: String,
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_val: String) {
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if im.contains_key(&key) {
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return;
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}
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let (tx, rx) = channel();
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println!("sending find_reducer");
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ctrl.send(ctrl_proto::find_reducer(key.as_bytes().to_vec(), tx)).unwrap();
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println!("receiving");
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let c = rx.recv().unwrap();
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println!("{}", c);
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im.insert(key, c);
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}
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let ctrl_clone = ctrl.clone();
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::map(input, Box::new(|a,b| emit(&mut intermediates, ctrl.clone(), a, b)));
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ctrl_clone.send(ctrl_proto::mapper_done).unwrap();
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}
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pub fn map_reduce(inputs: Vec<String>) {
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let (tx, rx) = channel();
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// This thread becomes the master control thread. It spawns others
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// to do the rest.
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let mut reducers: HashMap<String, isize>;
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reducers = HashMap::new();
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start_mappers(tx, inputs.clone());
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let mut num_mappers = inputs.len() as isize;
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while num_mappers > 0 {
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match rx.recv().unwrap() {
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ctrl_proto::mapper_done => { num_mappers -= 1; }
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ctrl_proto::find_reducer(k, cc) => {
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let mut c;
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match reducers.get(&str::from_utf8(&k).unwrap().to_string()) {
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Some(&_c) => { c = _c; }
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None => { c = 0; }
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}
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cc.send(c).unwrap();
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}
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}
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}
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}
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}
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pub fn main() {
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map_reduce::map_reduce(
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vec!["../src/test/run-pass/hashmap-memory.rs".to_string()]);
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}
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