| /* |
| * Copyright (c) 2015, 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 |
| * @summary Create a thread which stops in methods a(), a()->b(), a()->b()->c(), |
| * synchronizing on one monitor inside of each method. |
| * After checking that lock info is correct invoke another method |
| * and get the lock again. Repeat this action. |
| * @modules java.base/jdk.internal.misc |
| * @library /test/lib |
| * @library ../share |
| * @run main/othervm -XX:+UsePerfData SpreadLockTest |
| */ |
| import common.ToolResults; |
| import java.util.Iterator; |
| import utils.*; |
| |
| class SpreadLockDebuggee extends Thread { |
| |
| static final String THREAD_NAME = "MyThread"; |
| |
| SpreadLockDebuggee() { |
| setName(THREAD_NAME); |
| } |
| |
| Object monitor = new Object(); |
| |
| public void c() { |
| synchronized (monitor) { |
| Utils.sleep(); |
| } |
| } |
| |
| public void b() { |
| synchronized (monitor) { |
| try { |
| while (true) { |
| Thread.sleep(Long.MAX_VALUE); |
| } |
| } catch (InterruptedException e) { |
| c(); |
| } |
| } |
| } |
| |
| public void a() { |
| synchronized (monitor) { |
| try { |
| while (true) { |
| Thread.sleep(Long.MAX_VALUE); |
| } |
| } catch (InterruptedException e) { |
| b(); |
| } |
| } |
| } |
| |
| @Override |
| public void run() { |
| a(); |
| } |
| |
| } |
| |
| public class SpreadLockTest { |
| |
| public static void main(String[] args) throws Exception { |
| new SpreadLockTest().doTest(); |
| } |
| |
| private void doTest() throws Exception { |
| SpreadLockDebuggee debuggee = new SpreadLockDebuggee(); |
| |
| // Start in method a() |
| debuggee.start(); |
| |
| // Collect output from the jstack tool |
| JstackTool jstackTool = new JstackTool(ProcessHandle.current().pid()); |
| ToolResults results1 = jstackTool.measure(); |
| |
| // Go to method b() |
| debuggee.interrupt(); |
| |
| // Collect output from the jstack tool |
| ToolResults results2 = jstackTool.measure(); |
| |
| // Go to method c() |
| debuggee.interrupt(); |
| |
| // Collect output from the jstack tool |
| ToolResults results3 = jstackTool.measure(); |
| |
| analyse(results1.getStdoutString(), results2.getStdoutString(), results3.getStdoutString()); |
| } |
| |
| // Analyzing the outputs from the 3 jstack runs |
| public void analyse(String result1, String result2, String result3) { |
| String jstackStr1 = result1; |
| String jstackStr2 = result2; |
| String jstackStr3 = result3; |
| |
| if (jstackStr1 == null) { |
| throw new RuntimeException("First jstack output is empty"); |
| } |
| if (jstackStr2 == null) { |
| throw new RuntimeException("Second jstack output is empty"); |
| } |
| if (jstackStr3 == null) { |
| throw new RuntimeException("Third jstack output is empty"); |
| } |
| |
| Format format = new DefaultFormat(); |
| JStack jstack1 = format.parse(jstackStr1); |
| JStack jstack2 = format.parse(jstackStr2); |
| JStack jstack3 = format.parse(jstackStr3); |
| |
| ThreadStack ts1 = jstack1.getThreadStack(SpreadLockDebuggee.THREAD_NAME); |
| ThreadStack ts2 = jstack2.getThreadStack(SpreadLockDebuggee.THREAD_NAME); |
| ThreadStack ts3 = jstack3.getThreadStack(SpreadLockDebuggee.THREAD_NAME); |
| |
| if (ts1 == null || ts2 == null || ts3 == null) { |
| throw new RuntimeException( |
| "One of thread stack trace is null in the first jstack output : " |
| + ts1 + ", " + ts2 + ", " + ts3); |
| } |
| |
| MonitorInfo[] monitorInfo = new MonitorInfo[6]; |
| int counter = 0; |
| |
| Iterator<MethodInfo> it = ts1.getStack().iterator(); |
| while (it.hasNext()) { |
| MethodInfo mi = it.next(); |
| if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a")) { |
| monitorInfo[counter++] = haveToHaveOneLock(mi); |
| } |
| } |
| |
| it = ts2.getStack().iterator(); |
| while (it.hasNext()) { |
| MethodInfo mi = it.next(); |
| if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a") |
| || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".b")) { |
| monitorInfo[counter++] = haveToHaveOneLock(mi); |
| } |
| } |
| |
| it = ts3.getStack().iterator(); |
| while (it.hasNext()) { |
| MethodInfo mi = it.next(); |
| if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a") |
| || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".b") |
| || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".c")) { |
| monitorInfo[counter++] = haveToHaveOneLock(mi); |
| } |
| } |
| |
| System.out.println("All monitors found - passed"); |
| |
| } |
| |
| private MonitorInfo haveToHaveOneLock(MethodInfo mi) { |
| if (mi.getLocks().size() == 1) { |
| System.out.println("Method \"" + mi.getName() |
| + "\" contain 1 lock - correct"); |
| return mi.getLocks().getFirst(); |
| } else { |
| throw new RuntimeException("Lock count (" |
| + mi.getLocks().size() + ") is incorrect in method \"" |
| + mi.getName() + "\""); |
| } |
| } |
| |
| } |