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https://github.com/rust-lang/rust
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75fa9f6dec
This commit is extracted from #122036 and adds a new directive to the `compiletest` test runner, `//@ needs-threads`. This is intended to capture the need that a target must implement threading to execute a specific test, typically one that uses `std::thread`. This is primarily done for WebAssembly targets which currently do not have threads by default. This enables transitioning a lot of `//@ ignore-wasm*`-style ignores into a more self-documenting `//@ needs-threads` directive. Additionally the `wasm32-wasi-preview1-threads` target, for example, does actually have threads, but isn't tested in CI at this time. This change enables running these tests for that target, but not other wasm targets.
37 lines
764 B
Rust
37 lines
764 B
Rust
//@ run-pass
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#![allow(unused_parens)]
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//@ needs-threads
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use std::sync::mpsc::{channel, Sender};
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use std::thread;
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pub fn main() {
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let (tx, rx) = channel();
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// Spawn 10 threads each sending us back one isize.
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let mut i = 10;
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while (i > 0) {
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println!("{}", i);
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let tx = tx.clone();
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thread::spawn({let i = i; move|| { child(i, &tx) }});
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i = i - 1;
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}
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// Spawned threads are likely killed before they get a chance to send
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// anything back, so we deadlock here.
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i = 10;
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while (i > 0) {
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println!("{}", i);
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rx.recv().unwrap();
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i = i - 1;
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}
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println!("main thread exiting");
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}
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fn child(x: isize, tx: &Sender<isize>) {
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println!("{}", x);
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tx.send(x).unwrap();
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}
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