1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 /* 26 * @test HandshakeWalkOneExitTest 27 * @summary This test tries to stress the handshakes with new and exiting threads 28 * @library /testlibrary /test/lib 29 * @build HandshakeWalkOneExitTest 30 * @run main ClassFileInstaller sun.hotspot.WhiteBox 31 * sun.hotspot.WhiteBox$WhiteBoxPermission 32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI HandshakeWalkOneExitTest 33 */ 34 35 import jdk.test.lib.Asserts; 36 import sun.hotspot.WhiteBox; 37 38 public class HandshakeWalkOneExitTest implements Runnable { 39 40 @Override 41 public void run() { 42 } 43 44 static volatile boolean exit_now = false; 45 static Thread[] threads; 46 47 public static void main(String... args) throws Exception { 48 int testRuns = 20; 49 int testThreads = 128; 50 51 HandshakeWalkOneExitTest test = new HandshakeWalkOneExitTest(); 52 53 Runnable hser = new Runnable(){ 54 public void run(){ 55 WhiteBox wb = WhiteBox.getWhiteBox(); 56 while(!exit_now) { 57 Thread[] t = threads; 58 for (int i = 0; i<t.length ; i++) { 59 wb.handshakeWalkStack(t[i], false); 60 } 61 } 62 } 63 }; 64 Thread hst = new Thread(hser); 65 for (int k = 0; k<testRuns ; k++) { 66 threads = new Thread[testThreads]; 67 for (int i = 0; i<threads.length ; i++) { 68 threads[i] = new Thread(test); 69 threads[i].start(); 70 } 71 if (k == 0) { 72 hst.start(); 73 } 74 } 75 exit_now = true; 76 hst.join(); 77 } 78 }