1 files changed, 12 insertions, 0 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index 7f5dbe9155..b2d8e73693 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1652,4 +1652,16 @@ q.pop
       end
     end;
   end
+
+  # [Bug #21836]
+  def test_mn_threads_sub_millisecond_sleep
+    assert_separately([{'RUBY_MN_THREADS' => '1'}], "#{<<~"begin;"}\n#{<<~'end;'}", timeout: 30)
+    begin;
+      t0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+      1000.times { sleep 0.0001 }
+      t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+      elapsed = t1 - t0
+      assert_operator elapsed, :>=, 0.1, "sub-millisecond sleeps should not return immediately"
+    end;
+  end
 end