https://git.ruby-lang.org/ruby.git/commit/?id=de80b92891

From de80b928910b7ca785725382cec53cb27f1d65ed Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@u...>
Date: Sun, 20 Dec 2020 00:40:47 +0900
Subject: [pathname] Make Pathname Ractor safe (#3940)


diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index f71cec1..6f4c8d2 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -1512,6 +1512,10 @@ path_f_pathname(VALUE self, VALUE str) https://github.com/ruby/ruby/blob/trunk/ext/pathname/pathname.c#L1512
 void
 Init_pathname(void)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+#endif
+
     InitVM(pathname);
 
     rb_cPathname = rb_define_class("Pathname", rb_cObject);
diff --git a/test/pathname/test_ractor.rb b/test/pathname/test_ractor.rb
new file mode 100644
index 0000000..9ce43ef
--- /dev/null
+++ b/test/pathname/test_ractor.rb
@@ -0,0 +1,22 @@ https://github.com/ruby/ruby/blob/trunk/test/pathname/test_ractor.rb#L1
+# frozen_string_literal: true
+require "test/unit"
+require "pathname"
+
+class TestPathnameRactor < Test::Unit::TestCase
+  def setup
+    skip unless defined? Ractor
+  end
+
+  def test_ractor_shareable
+    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      $VERBOSE = nil
+      require "pathname"
+      r = Ractor.new Pathname("a") do |x|
+        x.join(Pathname("b"), Pathname("c"))
+      end
+      assert_equal(Pathname("a/b/c"), r.take)
+    end;
+  end
+end
+
-- 
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