coroutine 0.1.6

// The MIT License (MIT)

// Copyright (c) 2015 Rustcc Developers

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

use std::cell::UnsafeCell;
use std::sync::mpsc::{Sender, Receiver, channel};

use deque::{BufferPool, Worker, Stealer};

use coroutine::{self, Handle};

thread_local!(static COROUTINE_PROCESSOR: UnsafeCell<Processor> = UnsafeCell::new(Processor::new()));

pub enum Message {
    NewNeighbor(Stealer<Handle>),
}

pub type ProcessorHandle = Sender<Message>;

pub struct Processor {
    work_queue: Worker<Handle>,
    work_stealer: Stealer<Handle>,

    neighbors: Vec<Stealer<Handle>>,

    msg_sender: Sender<Message>,
    msg_receiver: Receiver<Message>,
}

impl Processor {
    pub fn new() -> Processor {
        let pool = BufferPool::new();
        let (worker, stealer) = pool.deque();

        let (tx, rx) = channel();

        Processor {
            work_queue: worker,
            work_stealer: stealer,
            neighbors: vec![],

            msg_sender: tx,
            msg_receiver: rx,
        }
    }

    pub fn ready(&mut self, h: Handle) {
        self.work_queue.push(h)
    }

    pub fn stealer(&self) -> Stealer<Handle> {
        self.work_stealer.clone()
    }

    pub fn handle(&self) -> ProcessorHandle {
        self.msg_sender.clone()
    }
}