Rundown of Async/Await in Rust

Feb 16, 20211 like263 views

Asynchronous programming is a method of programming that can allow multiple different things to be run concurrently (or in parallel). In Rust, it is accomplished using a high-level idea called a Future. Asynchronous programming is used a lot for IO because there are many times where you have to wait for something to happen (such as reading from a socket or a file) during which no progress can be made. This is a perfect moment to hand over control to something else so that it can start to make progress. This allows our program to always be making progress, which is the name of the game. Go through this slides, where Pawan Bisht will be talking about the asynchronous concept in Rust Programming like what operations performed by the Rust compiler that actually makes our code asynchronous and what's the role of waker, poll, etc. With this, you can increase your software/application's performance and responsiveness.

Rundown of
Async/Await
Presented By: Pawan Singh Bisht
Software Consultant
Knoldus Inc.

About Knoldus
Knoldus is a technology consulting firm with focus on modernizing the digital systems
at the pace your business demands.
Functional. Reactive. Cloud Native

What is Asynchronous programming?
Our Agenda
1
05
3
7
4
6
5
8
2
9
10
Alternatives for handling concurrent programming
Internals & Workflow
Rust vs. Go
Rust Future
Rust Future: Internal Execution
Executor & Reactor
Rust Future: Internal Execution (Quick Demo)
async/.await: Quick Intro
async/.await: Quick Demo

What is Asynchronous programming?
Asynchronous programming is a concept which allows multiple things to
happen at the same time.
● Parallel
● Concurrent
● Asynchronous

Parallel
● Parallelism is about doing a lot of things at the same time.
● Can be achieved only on multi cores.
Concurrent
● Concurrency is about dealing with a lot of things at the same time.
Asynchronous
● Asynchrony is used to present the impression of concurrent or parallel
tasking.

Alternatives for handling
concurrent programming
● Threads provided by the operating system : OS Threads
● Green threads

OS Threads (Native)
New OS thread for each task.
Pros:
● Easy to use
● Switching between tasks is reasonably fast
Cons:
● OS level threads come with a rather large stack.
● Could go out of memory if you have many tasks waiting simultaneously.
● Can be costly when the number of tasks are high.

Green Threads
Green threads are user level threads rather than kernel level threads.
Includes context switching
Pros:
● Light Weight
● Context switch" is reasonably fast.
Cons:
● Not a zero cost abstraction
● You need to save the CPU state on every switch.

async/.await: Quick Intro
Built-in tool of Rust Programming for writing asynchronous functions.
Async:
Transforms a block of code into a state machine that implements a
trait called Future.
Await:
Mechanism to run a Future.
It asynchronously waits for the future to complete.

async
‘async’ transforms a block of code into a state machine that
implements a trait called Future.
Two ways to use async: async fn and async blocks.
Each returns a value that implements the Future trait.

async
Using async keyword
with function
Using async block
inside function

.await
Asynchronously waits for the Future to complete
Inside async fn
Inside async block

Rust vs. Go
In terms of:
● Syntax
● Type
● Runtime

Rust Future
● Representation of some operation which will complete in the future.
● Zero-cost futures

References
● https://docs.rs/futures/0.3.12/futures/
● Understanding Futures In Rust
● Futures in Rust

Thank You!
@pawan.bisht@knoldus.com
@pawan-bisht-b70bb87a
@pawanbisht62

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