From 89a81625f4e4e0a065524e1a6c5b4d03289347ea Mon Sep 17 00:00:00 2001
From: Stjepan Glavina <stjepang@gmail.com>
Date: Fri, 27 Jul 2018 01:08:13 +0200
Subject: [PATCH 1/2] Impl Send & Sync for JoinHandle

---
 src/libstd/thread/mod.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 90f054186d1..fcb7fc87cb2 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -1276,6 +1276,9 @@ impl<T> JoinInner<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct JoinHandle<T>(JoinInner<T>);
 
+unsafe impl<T> Send for JoinHandle<T> {}
+unsafe impl<T> Sync for JoinHandle<T> {}
+
 impl<T> JoinHandle<T> {
     /// Extracts a handle to the underlying thread.
     ///

From 688db1df80b9754c28b79abb141e381861402fca Mon Sep 17 00:00:00 2001
From: Stjepan Glavina <stjepang@gmail.com>
Date: Fri, 27 Jul 2018 10:08:02 +0200
Subject: [PATCH 2/2] Add stability attributes

---
 src/libstd/thread/mod.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index fcb7fc87cb2..ebd9e8ba731 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -1276,7 +1276,9 @@ impl<T> JoinInner<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct JoinHandle<T>(JoinInner<T>);
 
+#[stable(feature = "joinhandle_impl_send_sync", since = "1.29.0")]
 unsafe impl<T> Send for JoinHandle<T> {}
+#[stable(feature = "joinhandle_impl_send_sync", since = "1.29.0")]
 unsafe impl<T> Sync for JoinHandle<T> {}
 
 impl<T> JoinHandle<T> {