use super::*;
use std::{
path::PathBuf,
sync::{
Arc, Condvar, Mutex,
atomic::{AtomicBool, Ordering},
mpsc,
},
thread,
time::Instant,
};
pub(in crate::app::jobs) struct DirectoryPool {
shared: Arc<DirectoryShared>,
workers: Vec<thread::JoinHandle<()>>,
metrics: Arc<Mutex<SchedulerMetrics>>,
}
struct DirectoryShared {
state: Mutex<DirectoryState>,
available: Condvar,
}
struct DirectoryState {
pending: Option<DirectoryRequest>,
pending_key: Option<DirectoryJobKey>,
active: Option<ActiveDirectoryJob>,
closed: bool,
}
#[derive(Clone, Debug)]
struct ActiveDirectoryJob {
key: DirectoryJobKey,
canceled: Arc<AtomicBool>,
}
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
struct DirectoryJobKey {
cwd: PathBuf,
show_hidden: bool,
sort_mode: SortMode,
}
impl DirectoryPool {
pub(in crate::app::jobs) fn new(
worker_count: usize,
result_tx: mpsc::Sender<JobResult>,
metrics: Arc<Mutex<SchedulerMetrics>>,
) -> Self {
let shared = Arc::new(DirectoryShared {
state: Mutex::new(DirectoryState {
pending: None,
pending_key: None,
active: None,
closed: false,
}),
available: Condvar::new(),
});
let mut workers = Vec::with_capacity(worker_count);
for _ in 0..worker_count {
let shared = Arc::clone(&shared);
let result_tx = result_tx.clone();
let metrics = Arc::clone(&metrics);
workers.push(thread::spawn(move || {
while let Some((request, canceled)) = DirectoryShared::pop(&shared) {
let key = DirectoryJobKey::from_request(&request);
let started_at = Instant::now();
let result = crate::fs::load_directory_snapshot_cancellable(
&request.cwd,
request.show_hidden,
request.sort_mode,
&|| canceled.load(Ordering::Relaxed),
)
.map_err(|error| {
let canceled = error
.downcast_ref::<std::io::Error>()
.is_some_and(|error| error.kind() == std::io::ErrorKind::Interrupted);
(canceled, error)
});
DirectoryShared::finish(&shared, &key);
lock_unpoison(&metrics).record_directory_completed(started_at.elapsed());
if canceled.load(Ordering::Relaxed) {
continue;
}
let result = match result {
Ok(snapshot) => Ok(snapshot),
Err((true, _)) => continue,
Err((false, error)) => Err(error
.downcast_ref::<std::io::Error>()
.map(crate::fs::describe_io_error)
.unwrap_or("Read error")
.to_string()),
};
if result_tx
.send(JobResult::Directory(DirectoryBuild {
token: request.token,
cwd: request.cwd,
result,
}))
.is_err()
{
break;
}
}
}));
}
Self {
shared,
workers,
metrics,
}
}
pub(in crate::app::jobs) fn submit(&self, request: DirectoryRequest) -> bool {
let key = DirectoryJobKey::from_request(&request);
let mut state = lock_unpoison(&self.shared.state);
if state.closed {
return false;
}
if state.pending_key.as_ref() == Some(&key) {
state.pending = Some(request);
if let Some(active) = &state.active {
active.canceled.store(true, Ordering::Relaxed);
}
self.shared.available.notify_one();
return true;
}
state.pending = Some(request);
state.pending_key = Some(key);
if let Some(active) = &state.active {
active.canceled.store(true, Ordering::Relaxed);
}
lock_unpoison(&self.metrics).directory_jobs_submitted += 1;
self.shared.available.notify_one();
true
}
pub(in crate::app::jobs) fn has_pending_work(&self) -> bool {
let state = lock_unpoison(&self.shared.state);
state.pending.is_some() || state.active.is_some()
}
}
impl Drop for DirectoryPool {
fn drop(&mut self) {
{
let mut state = lock_unpoison(&self.shared.state);
state.closed = true;
state.pending = None;
state.pending_key = None;
if let Some(active) = &state.active {
active.canceled.store(true, Ordering::Relaxed);
}
}
self.shared.available.notify_all();
for worker in self.workers.drain(..) {
let _ = worker.join();
}
}
}
impl DirectoryShared {
fn pop(shared: &Arc<Self>) -> Option<(DirectoryRequest, Arc<AtomicBool>)> {
let mut state = lock_unpoison(&shared.state);
loop {
if state.closed {
return None;
}
if state.active.is_none()
&& let Some(request) = state.pending.take()
{
let key = state
.pending_key
.take()
.expect("pending key should exist for directory job");
let canceled = Arc::new(AtomicBool::new(false));
state.active = Some(ActiveDirectoryJob {
key,
canceled: Arc::clone(&canceled),
});
return Some((request, canceled));
}
state = wait_unpoison(&shared.available, state);
}
}
fn finish(shared: &Arc<Self>, key: &DirectoryJobKey) {
let mut state = lock_unpoison(&shared.state);
if state
.active
.as_ref()
.is_some_and(|active| &active.key == key)
{
state.active = None;
}
shared.available.notify_one();
}
}
impl DirectoryJobKey {
fn from_request(request: &DirectoryRequest) -> Self {
Self {
cwd: request.cwd.clone(),
show_hidden: request.show_hidden,
sort_mode: request.sort_mode,
}
}
}