From f626998c4fa62973cac3a027597f97cdacd0d3c5 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Tue, 17 May 2022 00:50:02 +1200
Subject: Delete autoload data from global features after autoload has
 completed. (#5910)

* Update naming of critical section assertions macros.

* Improved locking for autoload.
---
 test/ruby/test_autoload.rb | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'test/ruby/test_autoload.rb')

diff --git a/test/ruby/test_autoload.rb b/test/ruby/test_autoload.rb
index 7709760d19..afabd5d26b 100644
--- a/test/ruby/test_autoload.rb
+++ b/test/ruby/test_autoload.rb
@@ -491,4 +491,32 @@ p Foo::Bar
     ::Object.class_eval {remove_const(:AutoloadTest)} if defined? Object::AutoloadTest
     TestAutoload.class_eval {remove_const(:AutoloadTest)} if defined? TestAutoload::AutoloadTest
   end
+
+  def test_autoload_parallel_race
+    Dir.mktmpdir('autoload') do |tmpdir|
+      autoload_path = File.join(tmpdir, "autoload_parallel_race.rb")
+      File.write(autoload_path, 'module Foo; end; module Bar; end')
+
+      assert_separately([], <<-RUBY, timeout: 100)
+        autoload_path = #{File.realpath(autoload_path).inspect}
+
+        # This should work with no errors or failures.
+        1000.times do
+          autoload :Foo, autoload_path
+          autoload :Bar, autoload_path
+
+          t1 = Thread.new {Foo}
+          t2 = Thread.new {Bar}
+
+          t1.join
+          t2.join
+
+          Object.send(:remove_const, :Foo)
+          Object.send(:remove_const, :Bar)
+
+          $LOADED_FEATURES.delete(autoload_path)
+        end
+      RUBY
+    end
+  end
 end
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