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Stop using an upgradeable read lock in interning

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Only one upgradeable read lock can be handed out at the same time, and
we never acquire a non-upgradeable read lock, so this has no benefit
over just using a write lock in the first place.
This commit is contained in:
Jonas Schievink 2021-04-02 20:46:37 +02:00
parent 0129628a0f
commit e73d26fa62
1 changed files with 2 additions and 5 deletions
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7
crates/hir_def/src/intern.rs
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@ -25,7 +25,7 @@ impl<T: Internable> Interned<T> {
let storage = T::storage().get();
let shard_idx = storage.determine_map(&obj);
let shard = &storage.shards()[shard_idx];
let shard = shard.upgradeable_read();
let mut shard = shard.write();
// Atomically,
// - check if `obj` is already in the map
@ -43,10 +43,7 @@ impl<T: Internable> Interned<T> {
let arc = Arc::new(obj);
let arc2 = arc.clone();
{
let mut shard = shard.upgrade();
shard.insert(arc2, SharedValue::new(()));
}
shard.insert(arc2, SharedValue::new(()));
Self { arc }
}