io-console is considered Ractor-safe

Author: nobu

ext/io/console/console.c

@@ -1764,6 +1764,10 @@ io_getpass(int argc, VALUE *argv, VALUE io)
 void
 Init_console(void)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    RB_EXT_RACTOR_SAFE(true);
+#endif
+
 #undef rb_intern
     id_getc = rb_intern("getc");
     id_gets = rb_intern("gets");

test/io/console/test_ractor.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+require 'test/unit'
+require 'rbconfig'
+
+class TestIOConsoleInRactor < Test::Unit::TestCase
+  def test_ractor
+    ext = "/io/console.#{RbConfig::CONFIG['DLEXT']}"
+    path = $".find {|path| path.end_with?(ext)}
+    assert_in_out_err(%W[-r#{path}], "#{<<~"begin;"}\n#{<<~'end;'}", ["true"], [])
+    begin;
+      $VERBOSE = nil
+      r = Ractor.new do
+        $stdout.console_mode
+      rescue SystemCallError
+        true
+      rescue Ractor::UnsafeError
+        false
+      else
+        true                    # should not success
+      end
+      puts r.take
+    end;
+  end
+end if defined? Ractor