From 9c8666a5c962bb009e6c5baf183d303f85efb642 Mon Sep 17 00:00:00 2001
From: kyren <kyren@kyju.org>
Date: Wed, 24 May 2023 09:10:59 -0400
Subject: [PATCH] Implement Send and Sync unconditionally for exposed Id type.
 (#3801)

---
 wgpu/src/lib.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/wgpu/src/lib.rs b/wgpu/src/lib.rs
index 1ba1315072..ca0c6ac50d 100644
--- a/wgpu/src/lib.rs
+++ b/wgpu/src/lib.rs
@@ -4263,6 +4263,15 @@ impl Surface {
 #[repr(transparent)]
 pub struct Id<T>(core::num::NonZeroU64, std::marker::PhantomData<*mut T>);
 
+// SAFETY: `Id` is a bare `NonZeroU64`, the type parameter is a marker purely to avoid confusing Ids
+// returned for different types , so `Id` can safely implement Send and Sync.
+#[cfg(feature = "expose-ids")]
+unsafe impl<T> Send for Id<T> {}
+
+// SAFETY: See the implementation for `Send`.
+#[cfg(feature = "expose-ids")]
+unsafe impl<T> Sync for Id<T> {}
+
 #[cfg(feature = "expose-ids")]
 impl<T> Clone for Id<T> {
     fn clone(&self) -> Self {