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|
use std::ffi::OsString;
use std::iter::IntoIterator;
use std::sync::Arc;
use std::sync::atomic::{
AtomicUsize,
Ordering,
};
use std::vec::Vec;
use std::{
panic,
thread,
};
use crossbeam_deque::{
Injector,
Steal,
Stealer,
Worker,
};
use dashmap::DashMap;
use crate::Flags;
#[derive(Clone, Copy, Eq, Hash, PartialEq)]
pub struct FileId(u32);
pub struct FileData {
name: OsString,
}
pub enum Job {
LexAndParse { file: FileId },
TypeCheck { file: FileId },
}
pub struct CompilerState {
pub files: DashMap<FileId, FileData>,
pub globalq: Injector<Job>,
pub njobs: AtomicUsize,
pub flags: Flags,
}
pub fn start<T>(paths: T, flags: Flags)
where
T: IntoIterator<Item = OsString>,
{
let state = Arc::new(CompilerState {
files: DashMap::new(),
globalq: Injector::new(),
njobs: AtomicUsize::new(0),
flags,
});
for (i, path) in paths.into_iter().enumerate() {
let id = FileId(i as u32);
state.files.insert(id, FileData { name: path.clone() });
state.njobs.fetch_add(1, Ordering::SeqCst);
state.globalq.push(Job::LexAndParse { file: id });
}
let mut workers = Vec::with_capacity(flags.threads);
let mut stealers = Vec::with_capacity(flags.threads);
for _ in 0..flags.threads {
let w = Worker::new_fifo();
stealers.push(w.stealer());
workers.push(w);
}
let mut threads = Vec::with_capacity(flags.threads);
let stealer_view: Arc<[_]> = Arc::from(stealers);
for (id, w) in workers.into_iter().enumerate() {
let stealer_view = Arc::clone(&stealer_view);
let state = Arc::clone(&state);
threads.push(thread::spawn(move || {
worker_loop(id, w, stealer_view, state);
}));
}
for t in threads {
t.join().unwrap_or_else(|e| panic::resume_unwind(e));
}
}
fn worker_loop(
id: usize,
queue: Worker<Job>,
stealers: Arc<[Stealer<Job>]>,
state: Arc<CompilerState>,
) {
loop {
if state.njobs.load(Ordering::SeqCst) == 0 {
break;
}
let job = find_task(&queue, &state.globalq, &stealers);
if let Some(job) = job {
match job {
LexAndParse { file } => {},
}
state.njobs.fetch_sub(1, Ordering::SeqCst);
} else {
thread::yield_now();
}
}
}
fn find_task(
localq: &Worker<Job>,
globalq: &Injector<Job>,
stealers: &Arc<[Stealer<Job>]>,
) -> Option<Job> {
if let Some(job) = localq.pop() {
return Some(job);
}
loop {
match globalq.steal_batch_and_pop(localq) {
Steal::Success(job) => return Some(job),
Steal::Empty => break,
Steal::Retry => continue,
}
}
for s in stealers.iter() {
loop {
match s.steal_batch_and_pop(localq) {
Steal::Success(job) => return Some(job),
Steal::Empty => break,
Steal::Retry => continue,
}
}
}
return None;
}
|
