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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 Mar 22
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      Both async-std and tokio are reimplementing the whole std::fs in an async manner. But can we invent some kind of async adapter for std::fs instead of replacing it entirely? 3/13

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    2. Stjepan Glavina‏ @stjepang Mar 22
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      Consider a function like tokio::fs::read_to_string(). Do we really need it? 4/13 https://docs.rs/tokio/0.2.13/tokio/fs/fn.read_to_string.html …pic.twitter.com/8X85P1j2D5

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    3. Stjepan Glavina‏ @stjepang Mar 22
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      Imagine there was a blocking!() macro that offloads a piece of code onto the blocking pool, kind of like spawn_blocking() with a nicer syntax. Then we could simply use std::fs::read_to_string() inside this macro. 5/13pic.twitter.com/GTjnEdHXrq

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    4. Stjepan Glavina‏ @stjepang Mar 22
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      That's actually not too bad! If we have the blocking!() macro, we don't really need async versions of any of the standalone functions in the std::fs module. 6/13

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    5. Stjepan Glavina‏ @stjepang Mar 22
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      What about the File type, though? In the vast majority of uses, files are only read or only written. Seeking is not a very common operation - in fact, I'd say seeking is a vestigial function that is now superseded by read_at()/write_at() functions. 7/13

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    6. Stjepan Glavina‏ @stjepang Mar 22
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      We need an adapter that takes anything implementing Read/Write and converts it into an async type implementing AsyncRead/AsyncWrite. Let's create functions reader()/writer() that look like this. 8/13pic.twitter.com/xY3aMJeyY1

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    7. Stjepan Glavina‏ @stjepang Mar 22
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      When reader()/writer() is called, a blocking task gets spawned that reads/writes data from the file and pipes it through an async channel. Here's how we'd convert a file into an async reader. 9/13pic.twitter.com/OvlQ6qZZwk

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    8. Stjepan Glavina‏ @stjepang Mar 22
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      Now we don't even need tokio::io::{stdin,stdout,stderr} anymore. Functions reader()/writer() can easily do asynchronous standard input/output. 10/13pic.twitter.com/iubNUkWfTX

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    9. Stjepan Glavina‏ @stjepang Mar 22
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      There's just one more async adapter... Similarly to reader()/writer(), let's create iter() that converts any blocking iterator into an async stream. 11/13pic.twitter.com/4rU0eYFAXg

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    10. Stjepan Glavina‏ @stjepang Mar 22
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      Function iter() comes in handy when listing files in a directory, for example. This is how we can list files asynchronously using the standard APIs from std::fs. 12/13pic.twitter.com/PN8NDo0KWN

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      Stjepan Glavina‏ @stjepang Mar 22
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      There you go. If we have blocking!(), reader(), writer(), and iter(), there's really no need to have modules like tokio::fs or even tokio::io. We can just use std::fs and std::io and apply async adapters to them! 13/13pic.twitter.com/Sym6Qbjnlf

      6:30 AM - 22 Mar 2020
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        1. Stjepan Glavina‏ @stjepang Mar 22
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          I forgot to mention: The blocking!() macro already exists and was first introduced in Bastion and it's really nice! https://docs.rs/bastion/0.3.5-alpha/bastion/macro.blocking.html …pic.twitter.com/rQjdrwX2ZZ

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        2. Lucretiel  🦀‏ @Lucretiel Apr 4
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          Replying to @stjepang

          Wait- if we're spawning blocking i/o operations into a thread pool, doesn't that defeat the purpose of using async i/o in the first place? We already have techniques for doing stuff in a thread pool; I had understood that context switching becomes an issue.

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        3. Stjepan Glavina‏ @stjepang Apr 4
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          Replying to @Lucretiel

          Networking can be done truly asynchronously using epoll/kqueue/WSAPoll. However, OSs don't handle async files and some other things as well. In those cases there isn't a better solution than offloading blocking operations onto a threadpool. Other runtimes like Go's do the same.

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