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Ch. 17: Explain join! in §02
This commit is contained in:
Chris Krycho
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[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.52.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
|
||||
dependencies = [
|
||||
"windows-targets 0.52.5",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm 0.48.5",
|
||||
"windows_aarch64_msvc 0.48.5",
|
||||
"windows_i686_gnu 0.48.5",
|
||||
"windows_i686_msvc 0.48.5",
|
||||
"windows_x86_64_gnu 0.48.5",
|
||||
"windows_x86_64_gnullvm 0.48.5",
|
||||
"windows_x86_64_msvc 0.48.5",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm 0.52.5",
|
||||
"windows_aarch64_msvc 0.52.5",
|
||||
"windows_i686_gnu 0.52.5",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc 0.52.5",
|
||||
"windows_x86_64_gnu 0.52.5",
|
||||
"windows_x86_64_gnullvm 0.52.5",
|
||||
"windows_x86_64_msvc 0.52.5",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
|
||||
9
listings/ch17-async-await/listing-17-09b/Cargo.toml
Normal file
9
listings/ch17-async-await/listing-17-09b/Cargo.toml
Normal file
@@ -0,0 +1,9 @@
|
||||
[package]
|
||||
name = "async_await"
|
||||
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" }
|
||||
46
listings/ch17-async-await/listing-17-09b/src/main.rs
Normal file
46
listings/ch17-async-await/listing-17-09b/src/main.rs
Normal file
@@ -0,0 +1,46 @@
|
||||
use std::time::Duration;
|
||||
|
||||
fn main() {
|
||||
trpl::block_on(async {
|
||||
let (tx, mut rx) = trpl::channel();
|
||||
|
||||
let tx1 = tx.clone();
|
||||
let tx1_fut = async move {
|
||||
let vals = vec![
|
||||
String::from("hi"),
|
||||
String::from("from"),
|
||||
String::from("the"),
|
||||
String::from("future"),
|
||||
];
|
||||
|
||||
for val in vals {
|
||||
tx1.send(val).unwrap();
|
||||
trpl::sleep(Duration::from_secs(1)).await;
|
||||
}
|
||||
};
|
||||
|
||||
let rx_fut = async {
|
||||
while let Some(value) = rx.recv().await {
|
||||
println!("received '{value}'");
|
||||
}
|
||||
};
|
||||
|
||||
let tx_fut = async move {
|
||||
let vals = vec![
|
||||
String::from("more"),
|
||||
String::from("messages"),
|
||||
String::from("for"),
|
||||
String::from("you"),
|
||||
];
|
||||
|
||||
for val in vals {
|
||||
tx.send(val).unwrap();
|
||||
trpl::sleep(Duration::from_secs(1)).await;
|
||||
}
|
||||
};
|
||||
|
||||
// ANCHOR: here
|
||||
trpl::join!(tx1_fut, tx_fut, rx_fut);
|
||||
// ANCHOR_END: here
|
||||
});
|
||||
}
|
||||
@@ -388,16 +388,26 @@ in the same infinite loop we started out in.
|
||||
|
||||
When we switched from using two futures to three, we also had to switch from
|
||||
using `join` to using `join3`. It would be annoying to do this every time we
|
||||
changed our code.
|
||||
changed our code. Happily, we have a macro form of `join` to which we can pass
|
||||
an arbitrary number of arguments. It also handles awaiting the futures itself.
|
||||
Thus, we could rewrite the code from Listing 17-TODO to use `join!` instead of `join3`, as in Listing 17-TODO:
|
||||
|
||||
<!-- TODO: explain how to use `join!` -->
|
||||
<Listing number="17-TODO" caption="Using `join!` to wait for multiple futures" file-name="src/main.rs">
|
||||
|
||||
However, both the function nor macro forms of `join` only work for cases where
|
||||
we know the number of futures ahead of time. If instead we have a dynamic number
|
||||
of futures, we need a function which works with a collection type which can grow
|
||||
and shrink dynamically at runtime, such as a vector. In real-world Rust, pushing
|
||||
futures into a collection and then waiting on some or all the futures in that
|
||||
collection to complete is a very common pattern.
|
||||
```rust
|
||||
{{#rustdoc_include ../listings/ch17-async-await/listing-17-09b/src/main.rs:here}}
|
||||
```
|
||||
|
||||
</Listing>
|
||||
|
||||
This is definitely a nice improvement over needing to swap between `join` and
|
||||
`join3` and `join4` and so on! However, both the function nor macro forms of
|
||||
`join` only work for cases where we know the number of futures ahead of time. If
|
||||
instead we have a dynamic number of futures, we need a function which works with
|
||||
a collection type which can grow and shrink dynamically at runtime, such as a
|
||||
vector. In real-world Rust, pushing futures into a collection and then waiting
|
||||
on some or all the futures in that collection to complete is a very common
|
||||
pattern.
|
||||
|
||||
The `trpl::join_all` function accepts any type which implements the `Iterator`
|
||||
trait, which we learned about back in Chapter 13, so it seems like just the
|
||||
|
||||
Reference in New Issue
Block a user