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stjepang's profile
Stjepan Glavina
Stjepan Glavina
Stjepan Glavina
@stjepang

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Stjepan Glavina

@stjepang

async runtimes and concurrency primitives in @rustlang he/they (available for hire)

Berlin, Germany
stjepang.github.io
Joined October 2009

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    1. Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      Another crate: async-listener. https://docs.rs/event-listener/  It's the secret sauce behind async-mutex and can turn any non-blocking operation into a blocking or asynchronous one. For example, let's implement a mutex... 👇pic.twitter.com/qqbriyvLu2

      5 replies 9 retweets 49 likes
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    2. Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      All you need to think about is function try_lock(). As soon as you have implemented it, with async-listener it's trivial to also add: 1. fn lock() 2. fn lock_timeout() 3. async fn lock()

      1 reply 0 retweets 2 likes
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    3. Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      Have a lock_ops variable of type Event inside the mutex. Every time it is unlocked, call lock_ops.notify_one(). To implement lock() function, follow this procedure: 1. Attempt locking with try_lock(). 2. Start listening for events. 3. Attempt locking again. 4. Wait for an event.

      1 reply 0 retweets 1 like
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    4. Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      fn lock(&self) -> MutexGuard<'_, T> { loop { if let Some(g) = self.try_lock() { return g; } let listener = self.lock_ops.listen(); if let Some(g) = self.try_lock() { return g; } listener.wait(); } }

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    5. Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      That's it! If you want an asynchronous version, just change this line: listener.wait(); To this: listener.await; Event also has methods wait_timeout() and wait_deadline() that only wait for a limited amount of time. See full mutex implementation here: https://github.com/stjepang/event-listener/blob/036865ed5cc529d51be4045adf32c29b16b966e7/examples/mutex.rs …

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      Stjepan Glavina‏ @stjepang May 17
      • Report Tweet
      • Report NetzDG Violation

      This also works with other data structures. As an example, if you have a concurrent queue, you can trivially add blocking or async methods to turn it into a channel. Think about how you would implement send() or recv() if all you have is try_send() or try_recv()!

      10:20 AM - 17 May 2020
      • 5 Likes
      • Smerity Gray_Jack David Bonet Jonathan Dunlap |∑|
      0 replies 0 retweets 5 likes

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