From 8ea2b40e5f621482d714fdd7cb05bbc592fc550b Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 11 Jan 2021 22:23:03 -0700
Subject: [PATCH] std.event.Loop: fix race condition when starting the time
 wheel

closes #7572
---
 lib/std/event/loop.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/std/event/loop.zig b/lib/std/event/loop.zig
index f5df637f37..8101d27a55 100644
--- a/lib/std/event/loop.zig
+++ b/lib/std/event/loop.zig
@@ -796,9 +796,10 @@ pub const Loop = struct {
                 .waiters = DelayQueue.Waiters{
                     .entries = std.atomic.Queue(anyframe).init(),
                 },
-                .thread = try std.Thread.spawn(self, DelayQueue.run),
                 .event = std.AutoResetEvent{},
                 .is_running = true,
+                // Must be last so that it can read the other state, such as `is_running`.
+                .thread = try std.Thread.spawn(self, DelayQueue.run),
             };
         }