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Add a better error message for #39364

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There is a known bug in the implementation of mpsc channels in rust.
This adds a clearer error message when the bug occurs, so that developers don't lose too much time looking for the origin of the bug.
See https://github.com/rust-lang/rust/issues/39364
This commit is contained in:
Ophir LOJKINE 2021-09-03 12:14:55 +02:00 • committed by GitHub
parent fbdff7fae9
commit aaa6de7905
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library/std/src/sync/mpsc/shared.rs
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@ -248,7 +248,7 @@ impl<T> Packet<T> {
// Returns true if blocking should proceed.
fn decrement(&self, token: SignalToken) -> StartResult {
unsafe {
assert_eq!(self.to_wake.load(Ordering::SeqCst), 0);
assert_eq!(self.to_wake.load(Ordering::SeqCst), 0, "This is a known bug in rust. See https://github.com/rust-lang/rust/issues/39364");
let ptr = token.cast_to_usize();
self.to_wake.store(ptr, Ordering::SeqCst);