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use std::sync::{mpsc, Arc};
use std::io;
use std::sync::atomic::{AtomicUsize, Ordering};
use user_event::UserEvent;
#[cfg(any(target_os = "linux", target_os = "android"))]
use epoll::KernelRegistrar;
#[cfg(any(target_os = "bitrig", target_os = "dragonfly",
target_os = "freebsd", target_os = "ios", target_os = "macos",
target_os = "netbsd", target_os = "openbsd"))]
pub use kqueue::KernelRegistrar;
pub fn channel<T>(registrar: &mut KernelRegistrar) -> io::Result<(Sender<T>, Receiver<T>)> {
let (tx, rx) = mpsc::channel();
let pending = Arc::new(AtomicUsize::new(0));
let user_event = try!(registrar.register_user_event().map_err(|e| io::Error::from(e)));
let dup = try!(user_event.try_clone());
let tx = Sender {
tx: tx,
user_event: user_event,
pending: pending.clone()
};
let rx = Receiver {
rx: rx,
user_event: dup,
pending: pending
};
Ok((tx, rx))
}
pub fn sync_channel<T>(registrar: &mut KernelRegistrar,
bound: usize) -> io::Result<(SyncSender<T>, Receiver<T>)> {
let (tx, rx) = mpsc::sync_channel(bound);
let pending = Arc::new(AtomicUsize::new(0));
let user_event = try!(registrar.register_user_event().map_err(|e| io::Error::from(e)));
let dup = try!(user_event.try_clone());
let tx = SyncSender {
tx: tx,
user_event: user_event,
pending: pending.clone()
};
let rx = Receiver {
rx: rx,
user_event: dup,
pending: pending
};
Ok((tx, rx))
}
#[derive(Debug)]
pub struct Sender<T> {
tx: mpsc::Sender<T>,
user_event: UserEvent,
pending: Arc<AtomicUsize>
}
impl<T> Sender<T> {
pub fn send(&self, msg: T) -> Result<(), ChannelError<T>> {
try!(self.tx.send(msg));
if self.pending.fetch_add(1, Ordering::SeqCst) == 0 {
try!(self.user_event.trigger());
}
Ok(())
}
pub fn try_clone(&self) -> io::Result<Sender<T>> {
Ok(Sender {
tx: self.tx.clone(),
user_event: self.user_event.try_clone()?,
pending: self.pending.clone()
})
}
pub fn get_id(&self) -> usize {
self.user_event.get_id()
}
}
#[derive(Debug)]
pub struct SyncSender<T> {
tx: mpsc::SyncSender<T>,
user_event: UserEvent,
pending: Arc<AtomicUsize>
}
impl<T> SyncSender<T> {
pub fn send(&self, msg: T) -> Result<(), ChannelError<T>> {
try!(self.tx.send(msg));
if self.pending.fetch_add(1, Ordering::SeqCst) == 0 {
try!(self.user_event.trigger());
}
Ok(())
}
pub fn try_send(&self, msg: T) -> Result<(), ChannelError<T>> {
try!(self.tx.try_send(msg));
if self.pending.fetch_add(1, Ordering::SeqCst) == 0 {
try!(self.user_event.trigger());
}
Ok(())
}
pub fn try_clone(&self) -> io::Result<SyncSender<T>> {
Ok(SyncSender {
tx: self.tx.clone(),
user_event: self.user_event.try_clone()?,
pending: self.pending.clone()
})
}
pub fn get_id(&self) -> usize {
self.user_event.get_id()
}
}
pub struct Receiver<T> {
rx: mpsc::Receiver<T>,
user_event: UserEvent,
pending: Arc<AtomicUsize>
}
impl<T> Receiver<T> {
pub fn try_recv(&self) -> Result<T, ChannelError<T>> {
if self.pending.load(Ordering::SeqCst) == 0 {
try!(self.user_event.clear());
if self.pending.load(Ordering::SeqCst) == 0 {
return Err(ChannelError::TryRecvError(mpsc::TryRecvError::Empty));
}
try!(self.user_event.trigger());
}
self.pending.fetch_sub(1, Ordering::SeqCst);
self.rx.try_recv().map_err(|e| ChannelError::from(e))
}
pub fn get_id(&self) -> usize {
self.user_event.id
}
}
#[cfg(not(any(target_os = "linux", target_os = "android")))]
impl<T> Drop for Receiver<T> {
fn drop(&mut self) {
let _ = self.user_event.deregister();
}
}
#[derive(Debug)]
pub enum ChannelError<T> {
SendError(mpsc::SendError<T>),
TrySendError(mpsc::TrySendError<T>),
TryRecvError(mpsc::TryRecvError),
Io(io::Error)
}
impl<T> From<io::Error> for ChannelError<T> {
fn from(e: io::Error) -> ChannelError<T> {
ChannelError::Io(e)
}
}
impl<T> From<mpsc::SendError<T>> for ChannelError<T> {
fn from(e: mpsc::SendError<T>) -> ChannelError<T> {
ChannelError::SendError(e)
}
}
impl<T> From<mpsc::TrySendError<T>> for ChannelError<T> {
fn from(e: mpsc::TrySendError<T>) -> ChannelError<T> {
ChannelError::TrySendError(e)
}
}
impl<T> From<mpsc::TryRecvError> for ChannelError<T> {
fn from(e: mpsc::TryRecvError) -> ChannelError<T> {
ChannelError::TryRecvError(e)
}
}