--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/handshake/HandshakeWalkStackTest.java Thu Aug 31 10:00:28 2017 +0200
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
+ * 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 HandshakeWalkStackTest
+ * @library /testlibrary /test/lib
+ * @build HandshakeWalkStackTest
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI HandshakeWalkStackTest
+ */
+
+import jdk.test.lib.Asserts;
+import sun.hotspot.WhiteBox;
+
+public class HandshakeWalkStackTest {
+
+ public static void main(String... args) throws Exception {
+ int iterations = 3;
+ if (args.length > 0) {
+ iterations = Integer.parseInt(args[0]);
+ }
+ test(iterations);
+ }
+
+ private static void test(int iterations) throws Exception {
+ Thread loop_thread = new Thread(() -> run_loop(create_list()));
+ Thread alloc_thread = new Thread(() -> run_alloc());
+ Thread wait_thread = new Thread(() -> run_wait(new Object() {}));
+ loop_thread.start();
+ alloc_thread.start();
+ wait_thread.start();
+
+ WhiteBox wb = WhiteBox.getWhiteBox();
+ int walked = 0;
+ for (int i = 0; i < iterations; i++) {
+ System.out.println("Iteration " + i);
+ System.out.flush();
+ Thread.sleep(200);
+ walked = wb.handshakeWalkStack(loop_thread, false);
+ Asserts.assertEQ(walked, 1, "Must have walked one thread stack");
+ Thread.sleep(200);
+ walked = wb.handshakeWalkStack(alloc_thread, false);
+ Asserts.assertEQ(walked, 1, "Must have walked one thread stack");
+ Thread.sleep(200);
+ walked = wb.handshakeWalkStack(wait_thread, false);
+ Asserts.assertEQ(walked, 1, "Must have walked one thread stack");
+ Thread.sleep(200);
+ walked = wb.handshakeWalkStack(Thread.currentThread(), false);
+ Asserts.assertEQ(walked, 1, "Must have walked one thread stack");
+ }
+ Thread.sleep(200);
+ walked = wb.handshakeWalkStack(null, true);
+ Asserts.assertGT(walked, 4, "Must have walked more than three thread stacks");
+ }
+
+ static class List {
+ List next;
+
+ List(List next) {
+ this.next = next;
+ }
+ }
+
+ public static List create_list() {
+ List head = new List(null);
+ List elem = new List(head);
+ List elem2 = new List(elem);
+ List elem3 = new List(elem2);
+ List elem4 = new List(elem3);
+ head.next = elem4;
+
+ return head;
+ }
+
+ public static void run_loop(List loop) {
+ while (loop.next != null) {
+ loop = loop.next;
+ }
+ }
+
+ public static byte[] array;
+
+ public static void run_alloc() {
+ while (true) {
+ // Write to public static to ensure the byte array escapes.
+ array = new byte[4096];
+ }
+ }
+
+ public static void run_wait(Object lock) {
+ synchronized (lock) {
+ try {
+ lock.wait();
+ } catch (InterruptedException ie) {}
+ }
+ }
+}