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Add watch::Sender::send_replace #3962

merged 1 commit into from
Sep 25, 2021


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The tokio::sync::watch channel currently requires that each value sent into the channel is completely independent, but this means that the buffers of old values cannot be reused.


Add send_replace which allows the sender to retrieve the previous value that was in the channel. The naming is inspired by mem::replace.

@Darksonn Darksonn added A-tokio Area: The main tokio crate M-sync Module: tokio/sync labels Jul 17, 2021
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@Noah-Kennedy Noah-Kennedy left a comment

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This seems fine.

@Darksonn Darksonn merged commit dee3236 into tokio-rs:master Sep 25, 2021
suikammd pushed a commit to suikammd/tokio that referenced this pull request Oct 7, 2021
jlebon added a commit to jlebon/ostree-rs-ext that referenced this pull request Jun 24, 2022
We use `Sender::send_replace` which was added in 1.13.0:

Closes: ostreedev#316
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A-tokio Area: The main tokio crate M-sync Module: tokio/sync
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3 participants