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Update components/salsa-2022/src/storage.rs

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Niko Matsakis 2024-04-02 06:15:43 -04:00 committed by GitHub
parent 998bcf606a
commit 9deaf3e149
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1 changed files with 8 additions and 1 deletions
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components/salsa-2022/src/storage.rs
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@ -139,7 +139,14 @@ where
loop {
self.runtime.set_cancellation_flag();
// jars need to be protected by a lock to avoid deadlocks.
// Acquire lock before we check if we have unique access to the jars.
// If we do not yet have unique access, we will go to sleep and wait for
// the snapshots to be dropped, which will signal the cond var associated
// with this lock.
//
// NB: We have to acquire the lock first to ensure that we can check for
// unique access and go to sleep waiting on the condvar atomically,
// as described in PR #474.
let mut guard = self.shared.noti_lock.lock();
// If we have unique access to the jars, we are done.
if Arc::get_mut(self.shared.jars.as_mut().unwrap()).is_some() {