1 #![allow(non_camel_case_types)]
4 // ignore-emscripten No support for threads
7 A somewhat reduced test case to expose some Valgrind issues.
9 This originally came from the word-count benchmark.
12 pub fn map(filename: String, mut emit: map_reduce::putter) {
13 emit(filename, "1".to_string());
17 use std::collections::HashMap;
18 use std::sync::mpsc::{channel, Sender};
22 pub type putter<'a> = Box<dyn FnMut(String, String) + 'a>;
24 pub type mapper = extern fn(String, putter);
26 enum ctrl_proto { find_reducer(Vec<u8>, Sender<isize>), mapper_done, }
28 fn start_mappers(ctrl: Sender<ctrl_proto>, inputs: Vec<String>) {
30 let ctrl = ctrl.clone();
32 thread::spawn(move|| map_task(ctrl.clone(), i.clone()) );
36 fn map_task(ctrl: Sender<ctrl_proto>, input: String) {
37 let mut intermediates = HashMap::new();
39 fn emit(im: &mut HashMap<String, isize>,
40 ctrl: Sender<ctrl_proto>, key: String,
42 if im.contains_key(&key) {
45 let (tx, rx) = channel();
46 println!("sending find_reducer");
47 ctrl.send(ctrl_proto::find_reducer(key.as_bytes().to_vec(), tx)).unwrap();
48 println!("receiving");
49 let c = rx.recv().unwrap();
54 let ctrl_clone = ctrl.clone();
55 ::map(input, Box::new(|a,b| emit(&mut intermediates, ctrl.clone(), a, b)));
56 ctrl_clone.send(ctrl_proto::mapper_done).unwrap();
59 pub fn map_reduce(inputs: Vec<String>) {
60 let (tx, rx) = channel();
62 // This thread becomes the master control thread. It spawns others
65 let mut reducers: HashMap<String, isize>;
67 reducers = HashMap::new();
69 start_mappers(tx, inputs.clone());
71 let mut num_mappers = inputs.len() as isize;
73 while num_mappers > 0 {
74 match rx.recv().unwrap() {
75 ctrl_proto::mapper_done => { num_mappers -= 1; }
76 ctrl_proto::find_reducer(k, cc) => {
78 match reducers.get(&str::from_utf8(&k).unwrap().to_string()) {
79 Some(&_c) => { c = _c; }
90 map_reduce::map_reduce(
91 vec!["../src/test/run-pass/hashmap-memory.rs".to_string()]);