Add CHANGELOG entry for #1028

Add a CHANGELOG entry for pull request #1028, which added Send + Sync
bounds to the OpenObject and Object types. Also add missing SAFETY
comments.

Signed-off-by: Daniel Müller <deso@posteo.net>

libbpf-rs/CHANGELOG.md

@@ -1,6 +1,7 @@
 0.25.0-beta.0
 -------------
 - Added `Map::lookup_batch` and `Map::lookup_and_delete_batch` method
+- Added `Send` & `Sync` impl for `OpenObject` & `Object` types
 
 
 0.24.8

libbpf-rs/src/object.rs

@@ -222,9 +222,6 @@ pub struct OpenObject {
     ptr: NonNull<libbpf_sys::bpf_object>,
 }
 
-unsafe impl Send for OpenObject {}
-unsafe impl Sync for OpenObject {}
-
 impl OpenObject {
     /// Takes ownership from pointer.
     ///
@@ -299,6 +296,11 @@ impl OpenObject {
     }
 }
 
+// SAFETY: `bpf_object` is freely transferable between threads.
+unsafe impl Send for OpenObject {}
+// SAFETY: `bpf_object` has no interior mutability.
+unsafe impl Sync for OpenObject {}
+
 impl AsRawLibbpf for OpenObject {
     type LibbpfType = libbpf_sys::bpf_object;
 
@@ -317,6 +319,7 @@ impl Drop for OpenObject {
     }
 }
 
+
 /// Represents a loaded BPF object file.
 ///
 /// An `Object` is logically in charge of all the contained [`Program`]s and [`Map`]s as well as
@@ -332,9 +335,6 @@ pub struct Object {
     ptr: NonNull<libbpf_sys::bpf_object>,
 }
 
-unsafe impl Send for Object {}
-unsafe impl Sync for Object {}
-
 impl Object {
     /// Takes ownership from pointer.
     ///
@@ -393,6 +393,11 @@ impl Object {
     }
 }
 
+// SAFETY: `bpf_object` is freely transferable between threads.
+unsafe impl Send for Object {}
+// SAFETY: `bpf_object` has no interior mutability.
+unsafe impl Sync for Object {}
+
 impl AsRawLibbpf for Object {
     type LibbpfType = libbpf_sys::bpf_object;