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use std::io::{self, Result}; use std::os::unix::io::{AsRawFd, FromRawFd, RawFd}; use libc; use mio::unix::EventedFd; use mio::{self, Evented, PollOpt, Ready, Token}; use futures::{try_ready, Async, AsyncSink, Poll, Sink, Stream}; use tokio_io::{AsyncRead, AsyncWrite}; use tokio_reactor::PollEvented; struct Inner(RawFd); impl Inner { fn new(sem: bool) -> Result<Self> { let flags = libc::EFD_NONBLOCK | libc::EFD_CLOEXEC; let flags = if sem { flags | libc::EFD_SEMAPHORE } else { flags }; let rv = unsafe { libc::eventfd(0, flags) }; if rv < 0 { return Err(io::Error::last_os_error()); } Ok(Inner(rv)) } fn try_clone(&self) -> Result<Self> { let rv = unsafe { libc::dup(self.0) }; if rv < 0 { return Err(io::Error::last_os_error()); } Ok(Inner(rv)) } } impl Drop for Inner { fn drop(&mut self) { unsafe { libc::close(self.0) }; } } impl io::Read for Inner { fn read(&mut self, buf: &mut [u8]) -> Result<usize> { let rv = unsafe { libc::read(self.0, buf.as_mut_ptr() as *mut std::ffi::c_void, buf.len()) }; if rv < 0 { return Err(io::Error::last_os_error()); } Ok(rv as usize) } } impl io::Write for Inner { fn write(&mut self, buf: &[u8]) -> Result<usize> { let rv = unsafe { libc::write(self.0, buf.as_ptr() as *const std::ffi::c_void, buf.len()) }; if rv < 0 { return Err(io::Error::last_os_error()); } Ok(rv as usize) } fn flush(&mut self) -> Result<()> { Ok(()) } } impl Evented for Inner { fn register( &self, poll: &mio::Poll, token: Token, interest: Ready, opts: PollOpt, ) -> Result<()> { poll.register(&EventedFd(&self.0), token, interest, opts) } fn reregister( &self, poll: &mio::Poll, token: Token, interest: Ready, opts: PollOpt, ) -> Result<()> { poll.reregister(&EventedFd(&self.0), token, interest, opts) } fn deregister(&self, poll: &mio::Poll) -> Result<()> { poll.deregister(&EventedFd(&self.0)) } } pub struct EventFd(PollEvented<Inner>); impl EventFd { pub fn new(semaphore: bool) -> Result<Self> { let inner = Inner::new(semaphore)?; Ok(EventFd(PollEvented::new(inner))) } pub fn try_clone(&self) -> Result<Self> { let inner = self.0.get_ref().try_clone()?; Ok(EventFd(PollEvented::new(inner))) } } impl Stream for EventFd { type Item = u64; type Error = io::Error; fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> { let ready = Ready::readable(); let ready = try_ready!(self.0.poll_read_ready(ready)); let mut buf = [0; 8]; match self.poll_read(&mut buf)? { Async::NotReady => { self.0.clear_read_ready(ready)?; Ok(Async::NotReady) } Async::Ready(_) => Ok(Async::Ready(Some(u64::from_ne_bytes(buf)))), } } } impl Sink for EventFd { type SinkItem = u64; type SinkError = io::Error; fn start_send(&mut self, item: Self::SinkItem) -> Result<AsyncSink<Self::SinkItem>> { if let Async::NotReady = self.0.poll_write_ready()? { return Ok(AsyncSink::NotReady(item)); } match self.poll_write(&item.to_ne_bytes()) { Ok(Async::Ready(_)) => Ok(AsyncSink::Ready), Ok(Async::NotReady) => { self.0.clear_write_ready()?; Ok(AsyncSink::NotReady(item)) } Err(err) => Err(err), } } fn poll_complete(&mut self) -> Poll<(), Self::SinkError> { Ok(Async::Ready(())) } } impl AsRawFd for EventFd { fn as_raw_fd(&self) -> RawFd { self.0.get_ref().0 } } impl FromRawFd for EventFd { unsafe fn from_raw_fd(fd: RawFd) -> Self { EventFd(PollEvented::new(Inner(fd))) } } impl io::Read for EventFd { fn read(&mut self, buf: &mut [u8]) -> Result<usize> { self.0.read(buf) } } impl AsyncRead for EventFd { fn poll_read(&mut self, buf: &mut [u8]) -> Poll<usize, io::Error> { self.0.poll_read(buf) } } impl io::Write for EventFd { fn write(&mut self, buf: &[u8]) -> Result<usize> { self.0.write(buf) } fn flush(&mut self) -> Result<()> { self.0.flush() } } impl AsyncWrite for EventFd { fn poll_write(&mut self, buf: &[u8]) -> Poll<usize, io::Error> { self.0.poll_write(buf) } fn shutdown(&mut self) -> Poll<(), io::Error> { Ok(Async::Ready(())) } } #[cfg(test)] mod tests { use super::*; use std::time::{Duration, Instant}; use tokio::prelude::*; use tokio::timer::Interval; #[test] fn increment_many() { let writer = EventFd::new(true).unwrap(); let reader = writer.try_clone().unwrap(); tokio::run(future::lazy(move || { tokio::spawn( stream::repeat(1) .take(5) .map_err(|_: ()| std::io::Error::new(std::io::ErrorKind::Other, "timer!")) .forward(writer) .map_err(|err| panic!(err)) .map(|_| ()), ); reader .for_each(|x| { println!("{}", x); Ok(()) }) .map_err(|err| panic!(err)) })); } #[test] fn it_works() { let writer = EventFd::new(true).unwrap(); let reader = writer.try_clone().unwrap(); tokio::run(future::lazy(move || { let sender = Interval::new_interval(Duration::from_secs(1)) .take(5) .map(|_| { println!("{:?} sent {}", Instant::now(), 1); 1u64 }) .map_err(|_| std::io::Error::new(std::io::ErrorKind::Other, "timer!")) .fuse() .forward(writer) .map_err(|err| panic!(err)) .map(|_| ()); let receiver = reader .for_each(|msg| { println!("{:?} received {}", Instant::now(), msg); Ok(()) }) .map_err(|err| panic!(err)); receiver.join(sender).map(|_| ()).map_err(|_| ()) })) } }