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doc: clarify limits on return values of AsyncWrite::poll_write (#3820)

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Edward Shen 2021-05-31 06:55:55 -04:00 committed by GitHub
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tokio/src/io/async_write.rs
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@ -45,7 +45,11 @@ use std::task::{Context, Poll};
pub trait AsyncWrite { pub trait AsyncWrite {
/// Attempt to write bytes from `buf` into the object. /// Attempt to write bytes from `buf` into the object.
/// ///
/// On success, returns `Poll::Ready(Ok(num_bytes_written))`. /// On success, returns `Poll::Ready(Ok(num_bytes_written))`. If successful,
/// then it must be guaranteed that `n <= buf.len()`. A return value of `0`
/// typically means that the underlying object is no longer able to accept
/// bytes and will likely not be able to in the future as well, or that the
/// buffer provided is empty.
/// ///
/// If the object is not ready for writing, the method returns /// If the object is not ready for writing, the method returns
/// `Poll::Pending` and arranges for the current task (via /// `Poll::Pending` and arranges for the current task (via