JRE-624 CThreading isAppKit() fails to detect main app thread if it was renamed

(cherry picked from commit c8f248a936)

with fix for JBR-5300 Change source code and test files to use GPL license

(cherry picked from commit 9aa93e5907)

test/jdk/jb/sun/lwawt/macosx/CThreading/IsAppKit.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2000-2023 JetBrains s.r.o.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary regression test on JRE-624 CThreading.isAppKit() fails to detect main app thread if it was renamed
+ * @compile -XDignore.symbol.file IsAppKit.java
+ * @run main/othervm IsAppKit 
+ */
+
+import javax.swing.*;
+import java.util.concurrent.*;
+import sun.lwawt.macosx.*;
+
+/*
+ * Description: The test checks detection of the main application thread
+ *
+ */
+
+public class IsAppKit {
+    public static void main(String[] args) throws Exception {
+
+        final CountDownLatch counter = new CountDownLatch(1);
+
+        SwingUtilities.invokeAndWait(() -> {
+            JFrame frame = new JFrame();
+            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            frame.pack();
+            frame.setVisible(true);
+            counter.countDown();
+        });
+
+        counter.await();
+
+        CThreading.privilegedExecuteOnAppKit(() -> {
+            String name = Thread.currentThread().getName();
+            if (!"AWT-AppKit".equals(name)) {
+                throw new RuntimeException("Unexpected thread name: " + name);
+            }
+
+            Thread.currentThread().setName("Some other thread name");
+            return null;
+        });
+
+
+        String name = CThreading.privilegedExecuteOnAppKit(() -> {
+            return Thread.currentThread().getName();
+        });
+
+        if (!"AWT-AppKit".equals(name)) {
+            throw new RuntimeException("Unexpected thread name: " + name);
+        }
+    }
+}