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Revert "Revert "libasync: don't let TcpStream::read() call back for empty buffers""

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Zero-length buffer is really a special case, as one must return Poll::Pending in this case.

This reverts commit 1ac10ba0d4.
This commit is contained in:
Sebastien Bourdeauducq 2020-04-15 09:16:25 +08:00
parent 1ac10ba0d4
commit be35be8d38
1 changed files with 12 additions and 6 deletions
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18
libasync/src/smoltcp/tcp_stream.rs
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@ -141,12 +141,18 @@ impl TcpStream {
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let result = self.stream.with_socket(|mut socket| {
socket.recv(|buf| match (self.f)(buf) {
Poll::Ready((amount, result)) =>
(amount, Poll::Ready(Ok(result))),
Poll::Pending =>
// 0 bytes consumed
(0, Poll::Pending),
socket.recv(|buf| {
if buf.len() > 0 {
match (self.f)(buf) {
Poll::Ready((amount, result)) =>
(amount, Poll::Ready(Ok(result))),
Poll::Pending =>
// 0 bytes consumed
(0, Poll::Pending),
}
} else {
(0, Poll::Pending)
}
})
});
match result {