https://git.ruby-lang.org/ruby.git/commit/?id=5a048829a4

From 5a048829a488bb1cb4b0e77b3d46a1920ad92136 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Wed, 15 Sep 2021 02:40:42 -0700
Subject: Add WB_PROTECTED to mutexes

mutex_mark is (basically) NULL, so we don't have any references to mark.
This means we should safely be able to mark Mutex as WB_PROTECTED
without changing anything else.
---
 thread_sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/thread_sync.c b/thread_sync.c
index ba5a78c..98d95ff 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -125,7 +125,7 @@ mutex_memsize(const void *ptr) https://github.com/ruby/ruby/blob/trunk/thread_sync.c#L125
 static const rb_data_type_t mutex_data_type = {
     "mutex",
     {mutex_mark, mutex_free, mutex_memsize,},
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
+    0, 0, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY
 };
 
 static rb_mutex_t *
-- 
cgit v1.1


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