Comments (5)
One way of doing this would be with a channel.
let (sender, receiver) = async_channel::bounded(1);
let ex = Executor::new();
let mut handles = vec![];
// Spawn all of the futures.
for future in futures_to_race {
handles.push(ex.spawn({
let sender = send.clone();
async move {
// Send the result of the future down the channel.
sender.send(future.await).await.ok();
}
});
}
// Run the executor while waiting for the result.
let result = ex.run(receiver.recv()).await.unwrap();
for handle in handles {
handle.cancel().await;
}
However, this is pretty unwieldy and I would like a way to implement this pattern in a simpler way. Same could probably go for the zip
and or
patterns.
from smol.
A fully generic channel looks a like a bit too much, why not e.g. a once_cell, an event and a flag (or just some kind of one-shot channel with clonable sending end)?
from smol.
Although that would work, it's unfair to expect this burden to fall onto the user. My idea was to create an async-executor-util
(name open to suggestions) crate to have all of the combinators that would be needed for this.
from smol.
ok, oh some additional prior art would also be https://github.com/YZITE/server-executor, which I wrote to have an executor for tests, simple async servers, etc.
from smol.
I think the futures-concurrency
crate provides a good solution to this problem for now, at least on the short scale. For larger scale futures we'll wait for a conclusion in smol-rs/futures-lite#93.
from smol.
Related Issues (20)
- async-net add TcpSocket? HOT 1
- It's not clear how to use Executor instead of smol::spawn HOT 1
- smol violates API guidelines' "C-STABLE" HOT 2
- TLS example should use `async_tls` instead of `async-native-tls`
- RUSTSEC-2021-0060: `aes-soft` has been merged into the `aes` crate HOT 1
- RUSTSEC-2021-0059: `aesni` has been merged into the `aes` crate HOT 1
- RUSTSEC-2021-0064: `cpuid-bool` has been renamed to `cpufeatures` HOT 1
- RUSTSEC-2020-0056: stdweb is unmaintained HOT 1
- RUSTSEC-2018-0017: `tempdir` crate has been deprecated; use `tempfile` instead HOT 1
- smol::spawn: BrokenPipe io::copy failed
- Panic: "There is no reactor running, must be called from the context of a Tokio 1.x runtime" HOT 3
- Give smol-rs a logo/mascot HOT 3
- Tracking issue for potentially useful features in future Rust versions HOT 11
- Tracking issue for smol v2.0.0 HOT 9
- Failing to check for closed socket causes future to spin, hogging executor thread HOT 2
- Should we expose event-listener in this crate? HOT 3
- concurrent futures combinators with smol HOT 1
- Destructors aren't run for detached tasks HOT 5
- File write just before exit seems racey HOT 2
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