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|
use task::Task;
use worker;
use crossbeam_deque::Injector;
use futures::task::AtomicTask;
use futures::{Async, Future, Poll};
use std::sync::{Arc, Mutex};
/// Future that resolves when the thread pool is shutdown.
///
/// A `ThreadPool` is shutdown once all the worker have drained their queues and
/// shutdown their threads.
///
/// `Shutdown` is returned by [`shutdown`], [`shutdown_on_idle`], and
/// [`shutdown_now`].
///
/// [`shutdown`]: struct.ThreadPool.html#method.shutdown
/// [`shutdown_on_idle`]: struct.ThreadPool.html#method.shutdown_on_idle
/// [`shutdown_now`]: struct.ThreadPool.html#method.shutdown_now
#[derive(Debug)]
pub struct Shutdown {
inner: Arc<Mutex<Inner>>,
}
/// Shared state between `Shutdown` and `ShutdownTrigger`.
///
/// This is used for notifying the `Shutdown` future when `ShutdownTrigger` gets dropped.
#[derive(Debug)]
struct Inner {
/// The task to notify when the threadpool completes the shutdown process.
task: AtomicTask,
/// `true` if the threadpool has been shut down.
completed: bool,
}
impl Shutdown {
pub(crate) fn new(trigger: &ShutdownTrigger) -> Shutdown {
Shutdown {
inner: trigger.inner.clone(),
}
}
}
impl Future for Shutdown {
type Item = ();
type Error = ();
fn poll(&mut self) -> Poll<(), ()> {
let inner = self.inner.lock().unwrap();
if !inner.completed {
inner.task.register();
Ok(Async::NotReady)
} else {
Ok(().into())
}
}
}
/// When dropped, cleans up threadpool's resources and completes the shutdown process.
#[derive(Debug)]
pub(crate) struct ShutdownTrigger {
inner: Arc<Mutex<Inner>>,
workers: Arc<[worker::Entry]>,
queue: Arc<Injector<Arc<Task>>>,
}
unsafe impl Send for ShutdownTrigger {}
unsafe impl Sync for ShutdownTrigger {}
impl ShutdownTrigger {
pub(crate) fn new(
workers: Arc<[worker::Entry]>,
queue: Arc<Injector<Arc<Task>>>,
) -> ShutdownTrigger {
ShutdownTrigger {
inner: Arc::new(Mutex::new(Inner {
task: AtomicTask::new(),
completed: false,
})),
workers,
queue,
}
}
}
impl Drop for ShutdownTrigger {
fn drop(&mut self) {
// Drain the global task queue.
while !self.queue.steal().is_empty() {}
// Drop the remaining incomplete tasks and parkers assosicated with workers.
for worker in self.workers.iter() {
worker.shutdown();
}
// Notify the task interested in shutdown.
let mut inner = self.inner.lock().unwrap();
inner.completed = true;
inner.task.notify();
}
}
|
