Add broadcast::Sender::len #5343
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The binary search can race with updates to |
sfackler
commented
Jan 4, 2023
| while low < high { | ||
| let mid = low + (high - low) / 2; | ||
| let idx = base_idx.wrapping_add(mid) & self.shared.mask; | ||
| if self.shared.buffer[idx].read().unwrap().rem.load(SeqCst) == 0 { |
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I think this can probably be a relaxed load rather than sequentially consistent, but haven't thought too carefully about it.
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Ping! |
Darksonn
reviewed
Jan 11, 2023
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Sorry about the delay. It looks correct, but its rather complicated, so I would like to see a more comprehensive test. Perhaps something that randomly chooses between "recv on chan 1, recv on chan 2, send a message" and checks that the length is correct between each iteration, for 1000 iterations?
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Will do! |
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Updated with a test that performs random operations and compares Sender::len against Receiver::len. |
Darksonn
reviewed
Jan 11, 2023
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Updated! |
crapStone
pushed a commit
to Calciumdibromid/CaBr2
that referenced
this pull request
Feb 2, 2023
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dependencies | minor | `1.24.2` -> `1.25.0` | | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dev-dependencies | minor | `1.24.2` -> `1.25.0` | --- ### Release Notes <details> <summary>tokio-rs/tokio</summary> ### [`v1.25.0`](https://github.com/tokio-rs/tokio/releases/tag/tokio-1.25.0): Tokio v1.25.0 ##### 1.25.0 (January 28, 2023) ##### Fixed - rt: fix runtime metrics reporting ([#​5330]) ##### Added - sync: add `broadcast::Sender::len` ([#​5343]) ##### Changed - fs: increase maximum read buffer size to 2MiB ([#​5397]) [#​5330]: tokio-rs/tokio#5330 [#​5343]: tokio-rs/tokio#5343 [#​5397]: tokio-rs/tokio#5397 </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:eyJjcmVhdGVkSW5WZXIiOiIzNC4xMTYuMSIsInVwZGF0ZWRJblZlciI6IjM0LjExOS4yIn0=--> Co-authored-by: cabr2-bot <[email protected]> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1761 Reviewed-by: crapStone <[email protected]> Co-authored-by: Calciumdibromid Bot <[email protected]> Co-committed-by: Calciumdibromid Bot <[email protected]>
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Since the head index for each receiver isn't stored in a location accessible from the sender, we need to instead binary search for the last value with remaining readers.
Closes #5334