From 82c4e170e5775ac0f3b4d14eba56a56f0c9126b4 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Fri, 8 Feb 2019 20:47:20 +0100
Subject: [PATCH] src: add lock to inspector `MainThreadHandle` dtor
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Otherwise, the `CHECK` is reported to be a race condition
by automated tooling. It’s not easy to tell from looking at
the source code whether that is actually the case or not,
but adding this lock should be a safe way to resolve it.

PR-URL: https://github.com/nodejs/node/pull/26010
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 src/inspector/main_thread_interface.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/inspector/main_thread_interface.h b/src/inspector/main_thread_interface.h
index 3e8eb13645b009..a7d9f8a3c939d8 100644
--- a/src/inspector/main_thread_interface.h
+++ b/src/inspector/main_thread_interface.h
@@ -45,6 +45,7 @@ class MainThreadHandle : public std::enable_shared_from_this<MainThreadHandle> {
                             : main_thread_(main_thread) {
   }
   ~MainThreadHandle() {
+    Mutex::ScopedLock scoped_lock(block_lock_);
     CHECK_NULL(main_thread_);  // main_thread_ should have called Reset
   }
   std::unique_ptr<InspectorSession> Connect(