* thread.c (thread_cleanup_func): delete locking_mutex when thread

  object become dummy because of fork.  [ruby-core:26744]
  [ruby-core:26745]

* bootstraptest/test_thread.rb: add a test for above.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@25771 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 23 insertions, 0 deletions

diff --git a/bootstraptest/test_thread.rb b/bootstraptest/test_thread.rb
index 0e7d03d43..4b715a154 100644
--- a/bootstraptest/test_thread.rb
+++ b/bootstraptest/test_thread.rb
@@ -385,3 +385,26 @@ assert_equal 'ok', %q{
   end
   :ok
 }
+
+assert_equal 'ok', %{
+  open("zzz.rb", "w") do |f|
+    f.puts <<-END
+      begin
+        m = Mutex.new
+        Thread.new { m.lock; sleep 1 }
+        sleep 0.3
+        Thread.new do
+          sleep 0.3
+          fork { GC.start }
+        end
+        m.lock
+        pid, status = Process.wait2
+        $result = status.success? ? :ok : :ng
+      rescue NotImplementedError
+        $result = :ok
+      end
+    END
+  end
+  require "./zzz.rb"
+  $result
+}