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[core] Implement downgrade for the lock module's RwLocks.

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Implement `RwLockWriteGuard::downgrade` for `lock::vanilla` and
`lock::ranked`, to downgrade a write lock to a read lock.
This commit is contained in:
Jim Blandy 2024-05-01 17:39:45 -07:00 committed by Erich Gubler
parent 651214ef74
commit 7c842a3b48
2 changed files with 15 additions and 0 deletions
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9
wgpu-core/src/lock/ranked.rs
View File

@ -281,6 +281,15 @@ impl<T> RwLock<T> {
}
}
impl<'a, T> RwLockWriteGuard<'a, T> {
pub fn downgrade(this: Self) -> RwLockReadGuard<'a, T> {
RwLockReadGuard {
inner: parking_lot::RwLockWriteGuard::downgrade(this.inner),
saved: this.saved,
}
}
}
impl<T: std::fmt::Debug> std::fmt::Debug for RwLock<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.inner.fmt(f)

6
wgpu-core/src/lock/vanilla.rs
View File

@ -86,6 +86,12 @@ impl<T> RwLock<T> {
}
}
impl<'a, T> RwLockWriteGuard<'a, T> {
pub fn downgrade(this: Self) -> RwLockReadGuard<'a, T> {
RwLockReadGuard(parking_lot::RwLockWriteGuard::downgrade(this.0))
}
}
impl<T: std::fmt::Debug> std::fmt::Debug for RwLock<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.0.fmt(f)