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Document potential memory leak in unbounded channel #121778

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merged 2 commits into from
Feb 29, 2024
Merged

Document potential memory leak in unbounded channel #121778

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9c6a076
document potential memory leak in unbounded channel
ibraheemdev Feb 29, 2024
7c9fa95
fix typos
ibraheemdev Feb 29, 2024
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3 changes: 3 additions & 0 deletions library/std/src/sync/mpmc/list.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -547,6 +547,9 @@ impl<T> Channel<T> {
}

let mut head = self.head.index.load(Ordering::Acquire);
// The channel may be uninitialized, so we have to swap to avoid overwriting any sender's attempts
// to initalize the first block before noticing that the receivers disconnected. Late allocations
// will be deallocated by the sender in Drop.
let mut block = self.head.block.swap(ptr::null_mut(), Ordering::AcqRel);

// If we're going to be dropping messages we need to synchronize with initialization
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