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io: document cancel safety of AsyncBufReadExt::fill_buf #6431

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Mar 26, 2024
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io: document cancel safety of AsyncBufReadExt::fill_buf #6431

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6 changes: 6 additions & 0 deletions tokio/src/io/util/async_buf_read_ext.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -267,6 +267,12 @@ cfg_io_util! {
/// This function will return an I/O error if the underlying reader was
/// read, but returned an error.
///
/// # Cancel safety
///
/// This method is cancel safe. If you use it as the event in a
/// [`tokio::select!`](crate::select) statement and some other branch
/// completes first, then it is guaranteed that no data was read.
///
/// [`consume`]: crate::io::AsyncBufReadExt::consume
fn fill_buf(&mut self) -> FillBuf<'_, Self>
where
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