1 /* 2 * Copyright (c) 2012, 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 7194254 27 * @summary Creates several threads with different java priorities and checks 28 * whether jstack reports correct priorities for them. 29 * 30 * @library /testlibrary 31 * @run main ThreadPriorities 32 */ 33 34 import java.util.ArrayList; 35 import java.util.concurrent.CyclicBarrier; 36 import java.util.regex.Matcher; 37 import java.util.regex.Pattern; 38 39 import com.oracle.java.testlibrary.*; 40 import static com.oracle.java.testlibrary.Asserts.*; 41 42 public class ThreadPriorities { 43 44 public static void main(String[] args) throws Throwable { 45 final int NUMBER_OF_JAVA_PRIORITIES = 46 Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1; 47 final CyclicBarrier barrier = 48 new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1); 49 50 for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) { 51 final int priority = p; 52 new Thread("Priority=" + p) { 53 { 54 setPriority(priority); 55 } 56 public void run() { 57 try { 58 barrier.await(); // 1st 59 barrier.await(); // 2nd 60 } catch (Exception exc) { 61 // ignore 62 } 63 } 64 }.start(); 65 } 66 barrier.await(); // 1st 67 68 int matches = 0; 69 ArrayList<String> failed = new ArrayList<>(); 70 ProcessBuilder pb = new ProcessBuilder( 71 JDKToolFinder.getJDKTool("jstack"), 72 String.valueOf(ProcessTools.getProcessId())); 73 74 String[] output = new OutputAnalyzer(pb.start()).getOutput().split("\\n+"); 75 76 Pattern pattern = Pattern.compile( 77 "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*"); 78 for (String line : output) { 79 Matcher matcher = pattern.matcher(line); 80 if (matcher.matches()) { 81 matches += 1; 82 String expected = matcher.group(1); 83 String actual = matcher.group(2); 84 if (!expected.equals(actual)) { 85 failed.add(line); 86 } 87 } 88 } 89 barrier.await(); // 2nd 90 barrier.reset(); 91 92 assertEquals(matches, NUMBER_OF_JAVA_PRIORITIES); 93 assertTrue(failed.isEmpty(), failed.size() + ":" + failed); 94 } 95 } 96