c6204279eb
# Objective - Contributes to #15460 - Supersedes #8520 - Fixes #4906 ## Solution - Added a new `web` feature to `bevy`, and several of its crates. - Enabled new `web` feature automatically within crates without `no_std` support. ## Testing - `cargo build --no-default-features --target wasm32v1-none` --- ## Migration Guide When using Bevy crates which _don't_ automatically enable the `web` feature, please enable it when building for the browser. ## Notes - I added [`cfg_if`](https://crates.io/crates/cfg-if) to help manage some of the feature gate gore that this extra feature introduces. It's still pretty ugly, but I think much easier to read. - Certain `wasm` targets (e.g., [wasm32-wasip1](https://doc.rust-lang.org/nightly/rustc/platform-support/wasm32-wasip1.html#wasm32-wasip1)) provide an incomplete implementation for `std`. I have not tested these platforms, but I suspect Bevy's liberal use of usually unsupported features (e.g., threading) will cause these targets to fail. As such, consider `wasm32-unknown-unknown` as the only `wasm` platform with support from Bevy for `std`. All others likely will need to be treated as `no_std` platforms.
34 lines
1018 B
Rust
34 lines
1018 B
Rust
//! This sample demonstrates a thread pool with one thread per logical core and only one task
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//! spinning. Other than the one thread, the system should remain idle, demonstrating good behavior
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//! for small workloads.
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use bevy_platform_support::time::Instant;
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use bevy_tasks::TaskPoolBuilder;
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use core::time::Duration;
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fn main() {
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let pool = TaskPoolBuilder::new()
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.thread_name("Idle Behavior ThreadPool".to_string())
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.build();
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pool.scope(|s| {
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for i in 0..1 {
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s.spawn(async move {
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println!("Blocking for 10 seconds");
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let now = Instant::now();
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while Instant::now() - now < Duration::from_millis(10000) {
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// spin, simulating work being done
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}
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println!(
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"Thread {:?} index {} finished",
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std::thread::current().id(),
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i
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);
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});
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}
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});
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println!("all tasks finished");
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}
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