From fb186a2f2d6ea3851f7e41f7e66a81a0a4f9146f Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 27 Jun 2022 11:44:45 -0400
Subject: [PATCH] make sure a thread is joined

---
 tests/pass/concurrency/sync_nopreempt.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/pass/concurrency/sync_nopreempt.rs b/tests/pass/concurrency/sync_nopreempt.rs
index 391f65ae5a9..b5e726dac7b 100644
--- a/tests/pass/concurrency/sync_nopreempt.rs
+++ b/tests/pass/concurrency/sync_nopreempt.rs
@@ -46,7 +46,7 @@ fn check_rwlock_unlock_bug1() {
 
     // Make a waiting writer.
     let l2 = l.clone();
-    thread::spawn(move || {
+    let t = thread::spawn(move || {
         let mut w = l2.write().unwrap();
         *w += 1;
     });
@@ -59,6 +59,7 @@ fn check_rwlock_unlock_bug1() {
     thread::yield_now();
     assert_eq!(*r2, 0);
     drop(r2);
+    t.join().unwrap();
 }
 
 fn check_rwlock_unlock_bug2() {