141 lines
4.2 KiB
Rust
141 lines
4.2 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::sync::Arc;
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use std::thread::{JoinHandle, self};
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use std::sync::atomic::{AtomicBool, Ordering as AtomicOrdering};
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use crossbeam::sync::chase_lev;
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use service::{HandlerId, IoChannel, IoContext};
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use IoHandler;
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use std::cell::Cell;
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use std::sync::{Condvar as SCondvar, Mutex as SMutex};
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const STACK_SIZE: usize = 16*1024*1024;
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thread_local! {
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/// Stack size
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/// Should be modified if it is changed in Rust since it is no way
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/// to know or get it
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pub static LOCAL_STACK_SIZE: Cell<usize> = Cell::new(::std::env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok()).unwrap_or(2 * 1024 * 1024));
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}
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pub enum WorkType<Message> {
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Readable,
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Writable,
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Hup,
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Timeout,
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Message(Message)
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}
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pub struct Work<Message> {
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pub work_type: WorkType<Message>,
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pub token: usize,
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pub handler_id: HandlerId,
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pub handler: Arc<IoHandler<Message>>,
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}
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/// An IO worker thread
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/// Sorts them ready for blockchain insertion.
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pub struct Worker {
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thread: Option<JoinHandle<()>>,
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wait: Arc<SCondvar>,
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deleting: Arc<AtomicBool>,
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wait_mutex: Arc<SMutex<()>>,
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}
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impl Worker {
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/// Creates a new worker instance.
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pub fn new<Message>(index: usize,
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stealer: chase_lev::Stealer<Work<Message>>,
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channel: IoChannel<Message>,
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wait: Arc<SCondvar>,
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wait_mutex: Arc<SMutex<()>>,
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) -> Worker
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where Message: Send + Sync + Clone + 'static {
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let deleting = Arc::new(AtomicBool::new(false));
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let mut worker = Worker {
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thread: None,
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wait: wait.clone(),
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deleting: deleting.clone(),
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wait_mutex: wait_mutex.clone(),
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};
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worker.thread = Some(thread::Builder::new().stack_size(STACK_SIZE).name(format!("IO Worker #{}", index)).spawn(
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move || {
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LOCAL_STACK_SIZE.with(|val| val.set(STACK_SIZE));
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Worker::work_loop(stealer, channel.clone(), wait, wait_mutex.clone(), deleting)
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})
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.expect("Error creating worker thread"));
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worker
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}
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fn work_loop<Message>(stealer: chase_lev::Stealer<Work<Message>>,
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channel: IoChannel<Message>, wait: Arc<SCondvar>,
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wait_mutex: Arc<SMutex<()>>,
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deleting: Arc<AtomicBool>)
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where Message: Send + Sync + Clone + 'static {
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loop {
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{
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let lock = wait_mutex.lock().expect("Poisoned work_loop mutex");
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if deleting.load(AtomicOrdering::Acquire) {
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return;
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}
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let _ = wait.wait(lock);
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}
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while !deleting.load(AtomicOrdering::Acquire) {
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match stealer.steal() {
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chase_lev::Steal::Data(work) => Worker::do_work(work, channel.clone()),
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_ => break,
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}
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}
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}
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}
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fn do_work<Message>(work: Work<Message>, channel: IoChannel<Message>) where Message: Send + Sync + Clone + 'static {
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match work.work_type {
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WorkType::Readable => {
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work.handler.stream_readable(&IoContext::new(channel, work.handler_id), work.token);
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},
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WorkType::Writable => {
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work.handler.stream_writable(&IoContext::new(channel, work.handler_id), work.token);
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}
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WorkType::Hup => {
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work.handler.stream_hup(&IoContext::new(channel, work.handler_id), work.token);
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}
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WorkType::Timeout => {
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work.handler.timeout(&IoContext::new(channel, work.handler_id), work.token);
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}
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WorkType::Message(message) => {
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work.handler.message(&IoContext::new(channel, work.handler_id), &message);
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}
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}
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}
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}
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impl Drop for Worker {
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fn drop(&mut self) {
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trace!(target: "shutdown", "[IoWorker] Closing...");
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let _ = self.wait_mutex.lock().expect("Poisoned work_loop mutex");
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self.deleting.store(true, AtomicOrdering::Release);
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self.wait.notify_all();
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if let Some(thread) = self.thread.take() {
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thread.join().ok();
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}
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trace!(target: "shutdown", "[IoWorker] Closed");
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}
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}
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