https://git.ruby-lang.org/ruby.git/commit/?id=846c4b03b8

From 846c4b03b8e9ff788f355f1bcd12e75715288e95 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Sun, 20 Dec 2020 04:21:54 +0900
Subject: ext/monitor is ractor-safe


diff --git a/ext/monitor/monitor.c b/ext/monitor/monitor.c
index 256fc4d..627d821 100644
--- a/ext/monitor/monitor.c
+++ b/ext/monitor/monitor.c
@@ -203,6 +203,10 @@ monitor_synchronize(VALUE monitor) https://github.com/ruby/ruby/blob/trunk/ext/monitor/monitor.c#L203
 void
 Init_monitor(void)
 {
+#if HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+#endif
+
     VALUE rb_cMonitor = rb_define_class("Monitor", rb_cObject);
     rb_define_alloc_func(rb_cMonitor, monitor_alloc);
 
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