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fix: reduce CPU usage when stdin is null #246

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fix: reduce CPU usage when stdin is null #246

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2 changes: 2 additions & 0 deletions libshpool/src/protocol.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ use super::{consts, tty};

const JOIN_POLL_DUR: time::Duration = time::Duration::from_millis(100);
const JOIN_HANGUP_DUR: time::Duration = time::Duration::from_millis(300);
const STDIN_POLL_DUR: time::Duration = time::Duration::from_millis(200);

/// The centralized encoding function that should be used for all protocol
/// serialization.
Expand Down Expand Up @@ -257,6 +258,7 @@ impl Client {
loop {
let nread = stdin.read(&mut buf).context("reading stdin from user")?;
if nread == 0 {
thread::sleep(STDIN_POLL_DUR);
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@ethanpailes ethanpailes Aug 14, 2025

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Do you mind adding a comment here explaining that this is just a tmp mitigation until we can gracefully detach in the face of EOF.

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@ethanpailes ethanpailes Aug 14, 2025

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I think hanging up here may be as simple as just returning Ok(()). It looks like that breaks a few tests, though hopefully just for timing reasons, so it's not entirely trivial. We probably want to write a new test ensuring that shpool attach with a null stdin does create the session as you would expect and the early hangup doesn't cause trouble as well.

continue;
}
debug!("read {} bytes", nread);
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