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Hardcode platform list in short-read optimization #6668

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merged 2 commits into from
Jul 2, 2024
Merged

Hardcode platform list in short-read optimization #6668

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7e2fe10
io: hardcode platform list in short-read optimization
Darksonn Jun 30, 2024
d03ba27
Fix unused vars warning
Darksonn Jul 2, 2024
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37 changes: 32 additions & 5 deletions tokio/src/io/poll_evented.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -179,15 +179,42 @@ feature! {
let evt = ready!(self.registration.poll_read_ready(cx))?;

let b = &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]);

// used only when the cfgs below apply
#[allow(unused_variables)]
let len = b.len();

match self.io.as_ref().unwrap().read(b) {
Ok(n) => {
// if we read a partially full buffer, this is sufficient on unix to show
// that the socket buffer has been drained. Unfortunately this assumption
// fails for level-triggered selectors (like on Windows or poll even for
// UNIX): https://github.com/tokio-rs/tokio/issues/5866
if n > 0 && (!cfg!(windows) && !cfg!(mio_unsupported_force_poll_poll) && n < len) {
// When mio is using the epoll or kqueue selector, reading a partially full
// buffer is sufficient to show that the socket buffer has been drained.
//
// This optimization does not work for level-triggered selectors such as
// windows or when poll is used.
//
// Read more:
// https://github.com/tokio-rs/tokio/issues/5866
#[cfg(all(
not(mio_unsupported_force_poll_poll),
any(
// epoll
target_os = "android",
target_os = "illumos",
target_os = "linux",
target_os = "redox",
// kqueue
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
target_os = "tvos",
target_os = "visionos",
target_os = "watchos",
)
))]
if 0 < n && n < len {
self.registration.clear_readiness(evt);
}

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