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runtime: fix a bug causing sockets to get stuck in CLOSE-WAIT.

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This commit is contained in:
whitequark 2017-07-05 16:24:16 +00:00
parent 86c027e9c5
commit 1e2603572a
2 changed files with 25 additions and 13 deletions
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3
artiq/firmware/runtime/mgmt.rs
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@ -83,7 +83,8 @@ pub fn thread(io: Io) {
io.spawn(4096, move |io| {
let mut stream = TcpStream::from_handle(&io, stream);
match worker(&mut stream) {
Ok(()) => {},
Ok(()) => (),
Err(ref err) if err.kind() == io::ErrorKind::UnexpectedEof => (),
Err(err) => error!("aborted: {}", err)
}
});

35
artiq/firmware/runtime/sched.rs
View File

@ -466,16 +466,22 @@ impl<'a> TcpStream<'a> {
impl<'a> Read for TcpStream<'a> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
// fast path
// Only borrow the underlying socket for the span of the next statement.
let result = self.as_lower().recv_slice(buf);
match result {
// Slow path: we need to block until buffer is non-empty.
Ok(0) | Err(()) => {
// slow path
if !self.as_lower().may_recv() { return Ok(0) }
until!(self, TcpSocketLower, |s| s.can_recv())?;
Ok(self.as_lower().recv_slice(buf)
.expect("may_recv implies that data was available"))
until!(self, TcpSocketLower, |s| s.can_recv() || !s.may_recv())?;
let mut socket = self.as_lower();
if socket.may_recv() {
Ok(socket.recv_slice(buf)
.expect("can_recv implies that data was available"))
} else {
// This socket will never receive data again.
Ok(0)
}
}
// Fast path: we had data in buffer.
Ok(length) => Ok(length)
}
}
@ -483,16 +489,21 @@ impl<'a> Read for TcpStream<'a> {
impl<'a> Write for TcpStream<'a> {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
// fast path
// Only borrow the underlying socket for the span of the next statement.
let result = self.as_lower().send_slice(buf);
match result {
// Slow path: we need to block until buffer is non-full.
Ok(0) | Err(()) => {
// slow path
if !self.as_lower().may_send() { return Ok(0) }
until!(self, TcpSocketLower, |s| s.can_send())?;
Ok(self.as_lower().send_slice(buf)
.expect("may_send implies that data was available"))
until!(self, TcpSocketLower, |s| s.can_send() || !s.may_send())?;
if self.as_lower().may_send() {
Ok(self.as_lower().send_slice(buf)
.expect("can_send implies that data was available"))
} else {
// This socket will never send data again.
Ok(0)
}
}
// Fast path: we had space in buffer.
Ok(length) => Ok(length)
}
}