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docs: add countdown latch example to Semaphore #6105

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docs: add countdown latch example to Semaphore #6105

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Commits on Oct 24, 2023

  1. docs: add countdown latch example to Semaphore 

    ## Motivation

Some users have requested that `tokio::sync` add a countdown latch
synchronization primitive. This can be implemented using the existing
`Semaphore` API, so rather than adding a countdown latch type, we should
add documentation examples showing how the `Semaphore` can be used as a
countdown latch.

## Solution

This branch adds an example to the `tokio::sync::Semaphore` docs
demonstrating its usage as a countdown latch. This example was extracted
from #6087 (comment).

Closes #6087
    @hawkw
    hawkw committed Oct 24, 2023
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Commits on Nov 5, 2023

  1. Update semaphore.rs 

    Co-authored-by: Alice Ryhl <aliceryhl@google.com>
    @hawkw @Darksonn
    hawkw and Darksonn committed Nov 5, 2023
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  2. Update semaphore.rs 

    Co-authored-by: Alice Ryhl <aliceryhl@google.com>
    @hawkw @Darksonn
    hawkw and Darksonn committed Nov 5, 2023
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  3. Update semaphore.rs 

    Co-authored-by: Alice Ryhl <aliceryhl@google.com>
    @hawkw @Darksonn
    hawkw and Darksonn committed Nov 5, 2023
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  4. Update semaphore.rs 

    Co-authored-by: Alice Ryhl <aliceryhl@google.com>
    @hawkw @Darksonn
    hawkw and Darksonn committed Nov 5, 2023
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