3 #![allow(non_camel_case_types)]
6 // ignore-emscripten No support for threads
9 A somewhat reduced test case to expose some Valgrind issues.
11 This originally came from the word-count benchmark.
14 pub fn map(filename: String, mut emit: map_reduce::putter) {
15 emit(filename, "1".to_string());
19 use std::collections::HashMap;
20 use std::sync::mpsc::{channel, Sender};
24 pub type putter<'a> = Box<dyn FnMut(String, String) + 'a>;
26 pub type mapper = extern "C" fn(String, putter);
28 enum ctrl_proto { find_reducer(Vec<u8>, Sender<isize>), mapper_done, }
30 fn start_mappers(ctrl: Sender<ctrl_proto>, inputs: Vec<String>) {
32 let ctrl = ctrl.clone();
34 thread::spawn(move|| map_task(ctrl.clone(), i.clone()) );
38 fn map_task(ctrl: Sender<ctrl_proto>, input: String) {
39 let mut intermediates = HashMap::new();
41 fn emit(im: &mut HashMap<String, isize>,
42 ctrl: Sender<ctrl_proto>, key: String,
44 if im.contains_key(&key) {
47 let (tx, rx) = channel();
48 println!("sending find_reducer");
49 ctrl.send(ctrl_proto::find_reducer(key.as_bytes().to_vec(), tx)).unwrap();
50 println!("receiving");
51 let c = rx.recv().unwrap();
56 let ctrl_clone = ctrl.clone();
57 ::map(input, Box::new(|a,b| emit(&mut intermediates, ctrl.clone(), a, b)));
58 ctrl_clone.send(ctrl_proto::mapper_done).unwrap();
61 pub fn map_reduce(inputs: Vec<String>) {
62 let (tx, rx) = channel();
64 // This thread becomes the master control thread. It spawns others
67 let mut reducers: HashMap<String, isize>;
69 reducers = HashMap::new();
71 start_mappers(tx, inputs.clone());
73 let mut num_mappers = inputs.len() as isize;
75 while num_mappers > 0 {
76 match rx.recv().unwrap() {
77 ctrl_proto::mapper_done => { num_mappers -= 1; }
78 ctrl_proto::find_reducer(k, cc) => {
80 match reducers.get(&str::from_utf8(&k).unwrap().to_string()) {
81 Some(&_c) => { c = _c; }
92 map_reduce::map_reduce(
93 vec!["../src/test/run-pass/hashmap-memory.rs".to_string()]);