https://git.ruby-lang.org/ruby.git/commit/?id=b7d01b0d1b

From b7d01b0d1bf0526e12e01c58963453f9711c67b5 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 28 Jun 2021 16:52:49 +0900
Subject: Refined define_thread_class

Reduce duplications
* ID caluculations of the same name
* checks against the same name
* registration to the root module hash
---
 thread_sync.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/thread_sync.c b/thread_sync.c
index c6183ca..f78b0b5 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -1554,10 +1554,10 @@ undumpable(VALUE obj) https://github.com/ruby/ruby/blob/trunk/thread_sync.c#L1554
 }
 
 static VALUE
-define_thread_class(VALUE outer, const char *name, VALUE super)
+define_thread_class(VALUE outer, const ID name, VALUE super)
 {
-    VALUE klass = rb_define_class_under(outer, name, super);
-    rb_define_const(rb_cObject, name, klass);
+    VALUE klass = rb_define_class_id_under(outer, name, super);
+    rb_const_set(rb_cObject, name, klass);
     return klass;
 }
 
@@ -1573,7 +1573,7 @@ Init_thread_sync(void) https://github.com/ruby/ruby/blob/trunk/thread_sync.c#L1573
 #endif
 
 #define DEFINE_CLASS(name, super) \
-    rb_c##name = define_thread_class(rb_cThread, #name, rb_c##super)
+    rb_c##name = define_thread_class(rb_cThread, rb_intern(#name), rb_c##super)
 
     /* Mutex */
     DEFINE_CLASS(Mutex, Object);
-- 
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