make FilePointer Send/Sync

src/lib.rs

@@ -50,13 +50,17 @@ type U64 = zerocopy::byteorder::U64<LE>;
 type U32 = zerocopy::byteorder::U32<LE>;
 type U16 = zerocopy::byteorder::U16<LE>;
 
+// TODO: what is the correct PhantomData for this type
 #[derive(FromBytes, FromZeroes, AsBytes, Unaligned)]
 #[repr(transparent)]
 pub struct FilePointer<T> {
     inner: RawFilePointer,
-    _phantom: PhantomData<*const T>,
+    _phantom: PhantomData<T>,
 }
 
+unsafe impl<T> Send for FilePointer<T> {}
+unsafe impl<T> Sync for FilePointer<T> {}
+
 impl<T> Clone for FilePointer<T> {
     fn clone(&self) -> Self {
         Self {