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Semaphore example for limiting access to a file #5939

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merged 4 commits into from Aug 20, 2023
Merged

Semaphore example for limiting access to a file #5939

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916e92f
Semaphore example for limiting access to a file
matildasmeds Aug 18, 2023
157a744
Use non-blocking File implementation
matildasmeds Aug 19, 2023
9d1f079
Use async methods in example
matildasmeds Aug 19, 2023
89f28eb
Explain the example
matildasmeds Aug 19, 2023
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15 changes: 15 additions & 0 deletions tokio/src/sync/semaphore.rs
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Expand Up @@ -73,6 +73,21 @@ use std::sync::Arc;
/// }
/// ```
///
/// Limit access to a file:
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/// ```
/// use std::io::{Result, Write};
/// use std::fs::File;
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///
/// static PERMITS: Semaphore = Semaphore::const_new(100);
///
/// async fn write_to_file(message: &[u8]) -> Result<()> {
/// let _permit = PERMITS.acquire().await.unwrap();
/// let mut buffer = File::create("example.txt")?;
/// buffer.write_all(message)?;
/// Ok(())
/// }
/// ```
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///
/// [`PollSemaphore`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSemaphore.html
/// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned
#[derive(Debug)]
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