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

---
 ext/monitor/monitor.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ext/monitor/monitor.c b/ext/monitor/monitor.c
index 256fc4d7db..627d8211d6 100644
--- a/ext/monitor/monitor.c
+++ b/ext/monitor/monitor.c
@@ -203,6 +203,10 @@ monitor_synchronize(VALUE monitor)
 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);