Improve thread safety docs/bounds for PrimitiveMut

PiperOrigin-RevId: 591047379
protocolbuffers · Dec 14, 2023 · 8505082 · 8505082
1 parent f51182b
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diff --git a/rust/primitive.rs b/rust/primitive.rs
@@ -37,6 +37,8 @@ impl<'msg, T> PrimitiveMut<'msg, T> {
     }
 }
 
+// SAFETY: all `T` that can perform mutations don't mutate through a shared
+// reference.
 unsafe impl<'msg, T> Sync for PrimitiveMut<'msg, T> {}
 
 impl<'msg, T> PrimitiveMut<'msg, T>

diff --git a/rust/vtable.rs b/rust/vtable.rs
@@ -432,6 +432,8 @@ pub trait PrimitiveWithRawVTable:
     + Debug
     + 'static
     + ProxiedWithPresence
+    + Sync
+    + Send
     + for<'msg> Proxied<View<'msg> = Self, Mut<'msg> = PrimitiveMut<'msg, Self>>
 {
 }