From e6944c52d19176da558c7f6340ffe1f1bddf2519 Mon Sep 17 00:00:00 2001
From: fakeshadow <24548779@qq.com>
Date: Sat, 17 Apr 2021 13:21:56 +0800
Subject: [PATCH] user internal access to reduce Clone cost

---
 actix-rt/src/system.rs | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/actix-rt/src/system.rs b/actix-rt/src/system.rs
index 2fdab778..7b15d152 100644
--- a/actix-rt/src/system.rs
+++ b/actix-rt/src/system.rs
@@ -157,10 +157,15 @@ impl System {
     {
         tokio::spawn(async {
             let (tx, rx) = oneshot::channel();
-            System::current().arbiter().spawn(async move {
-                let res = tokio::spawn(task).await;
-                let _ = tx.send(res);
+
+            CURRENT.with(|cell| match *cell.borrow() {
+                Some(ref sys) => sys.arbiter_handle.spawn(async {
+                    let res = tokio::spawn(task).await;
+                    let _ = tx.send(res);
+                }),
+                None => panic!("System is not running"),
             });
+
             // unwrap would be caught by tokio and output as JoinError
             rx.await.unwrap().unwrap()
         })