1 /* 2 * Copyright (c) 2014, 2015, 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 * @test 26 * @bug 8055008 27 * @summary Redefine EMCP and non-EMCP methods that are running in an infinite loop 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * @modules java.compiler 31 * java.instrument 32 * jdk.jartool/sun.tools.jar 33 * @run main RedefineClassHelper 34 * @run main/othervm -javaagent:redefineagent.jar -XX:TraceRedefineClasses=0x600 RedefineRunningMethods 35 */ 36 public class RedefineRunningMethods { 37 38 public static String newB = 39 "class RedefineRunningMethods$B {" + 40 " static int count1 = 0;" + 41 " static int count2 = 0;" + 42 " public static volatile boolean stop = false;" + 43 " static void localSleep() { " + 44 " try{ " + 45 " Thread.currentThread().sleep(10);" + 46 " } catch(InterruptedException ie) { " + 47 " } " + 48 " } " + 49 " public static void infinite() { " + 50 " System.out.println(\"infinite called\");" + 51 " }" + 52 " public static void infinite_emcp() { " + 53 " while (!stop) { count2++; localSleep(); }" + 54 " }" + 55 "}"; 56 57 public static String evenNewerB = 58 "class RedefineRunningMethods$B {" + 59 " static int count1 = 0;" + 60 " static int count2 = 0;" + 61 " public static volatile boolean stop = false;" + 62 " static void localSleep() { " + 63 " try{ " + 64 " Thread.currentThread().sleep(1);" + 65 " } catch(InterruptedException ie) { " + 66 " } " + 67 " } " + 68 " public static void infinite() { }" + 69 " public static void infinite_emcp() { " + 70 " System.out.println(\"infinite_emcp now obsolete called\");" + 71 " }" + 72 "}"; 73 74 static class B { 75 static int count1 = 0; 76 static int count2 = 0; 77 public static volatile boolean stop = false; 78 static void localSleep() { 79 try{ 80 Thread.currentThread().sleep(10);//sleep for 10 ms 81 } catch(InterruptedException ie) { 82 } 83 } 84 85 public static void infinite() { 86 while (!stop) { count1++; localSleep(); } 87 } 88 public static void infinite_emcp() { 89 while (!stop) { count2++; localSleep(); } 90 } 91 } 92 93 94 public static void main(String[] args) throws Exception { 95 96 new Thread() { 97 public void run() { 98 B.infinite(); 99 } 100 }.start(); 101 102 new Thread() { 103 public void run() { 104 B.infinite_emcp(); 105 } 106 }.start(); 107 108 RedefineClassHelper.redefineClass(B.class, newB); 109 110 System.gc(); 111 112 B.infinite(); 113 114 // Start a thread with the second version of infinite_emcp running 115 new Thread() { 116 public void run() { 117 B.infinite_emcp(); 118 } 119 }.start(); 120 121 for (int i = 0; i < 20 ; i++) { 122 String s = new String("some garbage"); 123 System.gc(); 124 } 125 126 RedefineClassHelper.redefineClass(B.class, evenNewerB); 127 System.gc(); 128 129 for (int i = 0; i < 20 ; i++) { 130 B.infinite(); 131 String s = new String("some garbage"); 132 System.gc(); 133 } 134 135 B.infinite_emcp(); 136 137 // purge should clean everything up. 138 B.stop = true; 139 140 for (int i = 0; i < 20 ; i++) { 141 B.infinite(); 142 String s = new String("some garbage"); 143 System.gc(); 144 } 145 } 146 }