1 /* 2 * Copyright (c) 2007, 2018, 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 package nsk.jvmti.unit.GetAllStackTraces; 25 26 import java.io.PrintStream; 27 import nsk.share.Consts; 28 29 public class getallstktr001 { 30 31 final static int THREADS_LIMIT = 40; 32 final static String NAME_PREFIX = "getallstktr001-"; 33 final static String THREAD_WAIT_METHOD_NAME = "RawMonitorEnter"; 34 GetResult()35 native static int GetResult(); CreateRawMonitor()36 native static void CreateRawMonitor(); RawMonitorEnter()37 native static void RawMonitorEnter(); RawMonitorExit()38 native static void RawMonitorExit(); GetAllStackTraces()39 native static void GetAllStackTraces(); GetThreadsInfo()40 native static void GetThreadsInfo(); GetThreadListStackTraces()41 native static void GetThreadListStackTraces(); ForceGC()42 native static void ForceGC(); CompareStackTraces()43 native static void CompareStackTraces(); DeallocateBuffers()44 native static void DeallocateBuffers(); 45 46 static volatile int thrCount = 0; 47 main(String args[])48 public static void main(String args[]) { 49 args = nsk.share.jvmti.JVMTITest.commonInit(args); 50 51 // produce JCK-like exit status. 52 System.exit(run(args, System.out) + Consts.JCK_STATUS_BASE); 53 } 54 run(String args[], PrintStream out)55 public static int run(String args[], PrintStream out) { 56 CreateRawMonitor(); 57 TestThread thr[] = new TestThread[THREADS_LIMIT]; 58 59 RawMonitorEnter(); 60 61 for (int i=0; i < THREADS_LIMIT; i++) { 62 thr[i] = new TestThread(NAME_PREFIX + i); 63 thr[i].start(); 64 } 65 66 // Wait until all hreads reach the expected state. 67 TestThread.waitAll(); 68 69 // Now some of them have increased the counter, 70 // but may haven't reached RawMonitorEnter yet 71 // Wait for such threads to enter raw monitor 72 int tries = 100; 73 for ( ;; ) { 74 try { Thread.sleep(500); } catch ( InterruptedException e ) {} 75 76 boolean allThreadsReady = true; 77 for ( Thread t : thr ) { 78 StackTraceElement[] stack = t.getStackTrace(); 79 if ( stack.length == 0 ) { 80 System.out.println("Thread " + t.getName() + " has an empty stack. Seems strange."); 81 continue; 82 } 83 84 if ( ! stack[0].getMethodName().equals(THREAD_WAIT_METHOD_NAME) ) { 85 System.out.println("Thread " + t.getName() + " hasn't reached the raw monitor yet:"); 86 for ( StackTraceElement s : stack ) { 87 System.out.println("\t" + s); 88 } 89 allThreadsReady = false; 90 break; 91 } 92 } 93 94 if ( allThreadsReady ) 95 break; 96 97 if ( --tries <= 0 ) 98 throw new Error("Timed out waiting for all threads reaching the raw monitor"); 99 } 100 101 GetAllStackTraces(); 102 GetThreadsInfo(); 103 GetThreadListStackTraces(); 104 ForceGC(); 105 CompareStackTraces(); 106 DeallocateBuffers(); 107 108 RawMonitorExit(); 109 110 try { 111 for (int i=0; i < THREADS_LIMIT; i++) { 112 thr[i].join(); 113 } 114 115 } catch (InterruptedException e) { 116 throw new Error("Unexpected: " + e); 117 } 118 return GetResult(); 119 } 120 121 static class TestThread extends Thread { 122 static int counter=0; 123 int ind; TestThread(String name)124 public TestThread(String name) { 125 super(name); 126 } run()127 public void run() { 128 thrCount++; 129 foo(0); 130 } incrCounter()131 private static synchronized void incrCounter() { 132 if (++counter == THREADS_LIMIT) { 133 TestThread.class.notify(); 134 } 135 } 136 waitAll()137 public static void waitAll() { 138 synchronized(TestThread.class) { 139 while (counter < THREADS_LIMIT) { 140 try { 141 TestThread.class.wait(); 142 } catch (InterruptedException ex) { 143 } 144 } 145 } 146 } 147 foo(int i)148 public void foo(int i) { 149 i++; 150 if ( i < 10 ) { 151 foo(i); 152 } else { 153 incrCounter(); 154 RawMonitorEnter(); 155 RawMonitorExit(); 156 } 157 158 } 159 } 160 } 161