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