From 43d0ee87a73b70443ff7328d9d599c1973aa494a Mon Sep 17 00:00:00 2001 From: Chris Krycho Date: Tue, 14 May 2024 15:59:10 -0600 Subject: [PATCH] =?UTF-8?q?Ch.=2017:=20start=20in=20earnest=20on=20=C2=A72?= =?UTF-8?q?,=20showing=20relation=20to=20threads?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add some listings which I can actually run, with `TODO` paths in them since I do not know what the numbers will be, since I have not actually finished with §0 or §1 yet! --- .../listing-TODO-01/Cargo.lock | 540 ++++++++++++++++++ .../listing-TODO-01/Cargo.toml | 9 + .../listing-TODO-01/src/main.rs | 17 + .../listing-TODO-02/Cargo.lock | 540 ++++++++++++++++++ .../listing-TODO-02/Cargo.toml | 9 + .../listing-TODO-02/src/main.rs | 19 + .../listing-TODO-03/Cargo.lock | 540 ++++++++++++++++++ .../listing-TODO-03/Cargo.toml | 9 + .../listing-TODO-03/src/main.rs | 21 + src/ch17-02.md | 110 ++++ 10 files changed, 1814 insertions(+) create mode 100644 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https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +trpl = { path = "../../../packages/trpl" } diff --git a/listings/ch17-async-await/listing-TODO-01/src/main.rs b/listings/ch17-async-await/listing-TODO-01/src/main.rs new file mode 100644 index 0000000000..4af024741e --- /dev/null +++ b/listings/ch17-async-await/listing-TODO-01/src/main.rs @@ -0,0 +1,17 @@ +use std::time::Duration; + +fn main() { + trpl::block_on(async { + trpl::spawn_task(async { + for i in 1..10 { + println!("hi number {i} from the first task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }); + + for i in 1..5 { + println!("hi number {i} from the second task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }); +} diff --git a/listings/ch17-async-await/listing-TODO-02/Cargo.lock b/listings/ch17-async-await/listing-TODO-02/Cargo.lock new file mode 100644 index 0000000000..3be4eaaa53 --- /dev/null +++ b/listings/ch17-async-await/listing-TODO-02/Cargo.lock @@ -0,0 +1,540 @@ +# 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https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +trpl = { path = "../../../packages/trpl" } diff --git a/listings/ch17-async-await/listing-TODO-02/src/main.rs b/listings/ch17-async-await/listing-TODO-02/src/main.rs new file mode 100644 index 0000000000..71cb24e34c --- /dev/null +++ b/listings/ch17-async-await/listing-TODO-02/src/main.rs @@ -0,0 +1,19 @@ +use std::time::Duration; + +fn main() { + trpl::block_on(async { + let handle = trpl::spawn_task(async { + for i in 1..10 { + println!("hi number {i} from the first task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }); + + for i in 1..5 { + println!("hi number {i} from the second task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + + handle.await; + }); +} diff --git a/listings/ch17-async-await/listing-TODO-03/Cargo.lock b/listings/ch17-async-await/listing-TODO-03/Cargo.lock new file mode 100644 index 0000000000..3be4eaaa53 --- /dev/null +++ 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+version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +trpl = { path = "../../../packages/trpl" } diff --git a/listings/ch17-async-await/listing-TODO-03/src/main.rs b/listings/ch17-async-await/listing-TODO-03/src/main.rs new file mode 100644 index 0000000000..8797b5d634 --- /dev/null +++ b/listings/ch17-async-await/listing-TODO-03/src/main.rs @@ -0,0 +1,21 @@ +use std::time::Duration; + +fn main() { + trpl::block_on(async { + let fut1 = async { + for i in 1..10 { + println!("hi number {i} from the first task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }; + + let fut2 = async { + for i in 1..5 { + println!("hi number {i} from the second task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }; + + trpl::join(fut1, fut2).await; + }); +} diff --git a/src/ch17-02.md b/src/ch17-02.md index 2ff1a880d6..eeb335866e 100644 --- a/src/ch17-02.md +++ b/src/ch17-02.md @@ -1 +1,111 @@ ## TODO: Section Title + +Back in Chapter 16, we saw an example of counting up on multiple threads. Given +that threads allow us to implement a form of concurrency, we might expect that +async APIs can substitute fairly directly for the threading APIs. The `trpl` +crate supplies a `spawn_task` function which looks very similar to the +`thread::spawn` API, and a `sleep` function which is an async version of the +`thread::sleep` API. We can use these together to implement the same counting +example as with threads: + + + ++ +```rust +{{#rustdoc_include ../listings/ch17-async-await/listing-TODO-01/src/main.rs}} +``` + + + +This does something very similar to what the thread-base implementation did, as +we can see from the output: + +```text +hi number 1 from the second task! +hi number 1 from the first task! +hi number 2 from the first task! +hi number 2 from the second task! +hi number 3 from the first task! +hi number 3 from the second task! +hi number 4 from the first task! +hi number 4 from the second task! +hi number 5 from the first task! +``` + +Just like with the threading example, you may see a different order in your own +terminal output when you run this. And, just like the threading example, if you +want to run all the way to the completion of the first task, you will need to +use a join handle to wait for the first task to complete. With threads, we used +the `join` method to “block” until the thread was done running. Here, we can use +`await` to do the same thing: + + + +```rust +use std::time::Duration; + +fn main() { + trpl::block_on(async { + let handle = trpl::spawn_task(async { + for i in 1..10 { + println!("hi number {i} from the first task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + }); + + for i in 1..5 { + println!("hi number {i} from the second task!"); + trpl::sleep(Duration::from_millis(1)).await; + } + + handle.join().await + }); +} +``` + +Now the output again matches + +```text +hi number 1 from the second task! +hi number 1 from the first task! +hi number 2 from the first task! +hi number 2 from the second task! +hi number 3 from the first task! +hi number 3 from the second task! +hi number 4 from the first task! +hi number 4 from the second task! +hi number 5 from the first task! +hi number 6 from the first task! +hi number 7 from the first task! +hi number 8 from the first task! +hi number 9 from the first task! +``` + + + + + +```text +hi number 1 from the first task! +hi number 1 from the second task! +hi number 2 from the first task! +hi number 2 from the second task! +hi number 3 from the first task! +hi number 3 from the second task! +hi number 4 from the first task! +hi number 4 from the second task! +hi number 5 from the first task! +hi number 6 from the first task! +hi number 7 from the first task! +hi number 8 from the first task! +hi number 9 from the first task! +``` + +Here, at least with the implementation we are using in `trpl`, you will see +the exact same order every time, which is *very* different from what we saw with +threads. +