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process: expose AW::poll_write_vectored on unix #5216

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merged 3 commits into from Nov 21, 2022

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koivunej
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Motivation

For inter-process communication over stdin and stdout it would be helpful to use vectored writes.

Solution

Expose already existing vectored facilities in tokio::io::PollEvented on the AsyncWrite implementation of tokio::process::ChildStdin by providing a forwarding implementation instead of using the default non-vectoring implementation.

Adjusts the tokio::io::PollEvented vectored writes support to be enabled on feature = "process".

@koivunej
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Quite unsure how to test this. tests-integration has process-stdio.rs, one could make a test that a cat being fed on cfg!(unix) a poll_write_vectored completes with 1 poll?

@Darksonn Darksonn added A-tokio Area: The main tokio crate M-process Module: tokio/process labels Nov 21, 2022
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Looks good to me.

@Darksonn Darksonn enabled auto-merge (squash) November 21, 2022 11:17
Co-authored-by: Alice Ryhl <aliceryhl@google.com>
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Ok looks good to me.

@Darksonn Darksonn enabled auto-merge (squash) November 21, 2022 13:33
@Darksonn Darksonn merged commit f15d14e into tokio-rs:master Nov 21, 2022
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@koivunej koivunej deleted the expose_childstdin_writev branch November 21, 2022 14:25
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Darksonn commented Nov 21, 2022

Yes, that seems to be due to a flaky test. I believe it is related to #5207.

failures:

---- worker_noop_count stdout ----
thread 'main' panicked at 'assertion failed: 2 <= metrics.worker_noop_count(0)', tokio/tests/rt_metrics.rs:131:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    worker_noop_count

on cross-test (aarch64-unknown-linux-gnu)

carllerche added a commit that referenced this pull request Dec 5, 2022
 - net: fix Windows named pipe connect ([#5208])
 - io: support vectored writes for `ChildStdin` ([#5216])
 - io: fix `async fn ready()` false positive for OS-specific events ([#5231])

 ### Changed
 - runtime: `yield_now` defers task until after driver poll ([#5223])
 - runtime: reduce amount of codegen needed per spawned task ([#5213])
 - windows: replace `winapi` dependency with `windows-sys` ([#5204])

 [#5208]: #5208
 [#5216]: #5216
 [#5213]: #5213
 [#5204]: #5204
 [#5223]: #5223
 [#5231]: #5231
carllerche added a commit that referenced this pull request Dec 5, 2022
### Fixed
 - net: fix Windows named pipe connect ([#5208])
 - io: support vectored writes for `ChildStdin` ([#5216])
 - io: fix `async fn ready()` false positive for OS-specific events ([#5231])

 ### Changed
 - runtime: `yield_now` defers task until after driver poll ([#5223])
 - runtime: reduce amount of codegen needed per spawned task ([#5213])
 - windows: replace `winapi` dependency with `windows-sys` ([#5204])

 [#5208]: #5208
 [#5216]: #5216
 [#5213]: #5213
 [#5204]: #5204
 [#5223]: #5223
 [#5231]: #5231
crapStone pushed a commit to Calciumdibromid/CaBr2 that referenced this pull request Dec 23, 2022
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dependencies | minor | `1.22.0` -> `1.23.0` |
| [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dev-dependencies | minor | `1.22.0` -> `1.23.0` |

---

### Release Notes

<details>
<summary>tokio-rs/tokio</summary>

### [`v1.23.0`](https://github.com/tokio-rs/tokio/releases/tag/tokio-1.23.0): Tokio v1.23.0

[Compare Source](tokio-rs/tokio@tokio-1.22.0...tokio-1.23.0)

##### Fixed

-   net: fix Windows named pipe connect ([#&#8203;5208])
-   io: support vectored writes for `ChildStdin` ([#&#8203;5216])
-   io: fix `async fn ready()` false positive for OS-specific events ([#&#8203;5231])

##### Changed

-   runtime: `yield_now` defers task until after driver poll ([#&#8203;5223])
-   runtime: reduce amount of codegen needed per spawned task ([#&#8203;5213])
-   windows: replace `winapi` dependency with `windows-sys` ([#&#8203;5204])

[#&#8203;5208]: tokio-rs/tokio#5208

[#&#8203;5216]: tokio-rs/tokio#5216

[#&#8203;5213]: tokio-rs/tokio#5213

[#&#8203;5204]: tokio-rs/tokio#5204

[#&#8203;5223]: tokio-rs/tokio#5223

[#&#8203;5231]: tokio-rs/tokio#5231

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these updates again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC43MC4wIiwidXBkYXRlZEluVmVyIjoiMzQuNzAuMCJ9-->

Co-authored-by: cabr2-bot <cabr2.help@gmail.com>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1687
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>
Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
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