| /* |
| * Copyright (c) 2000, 2018, 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 |
| * @key stress |
| * |
| * @summary converted from VM testbase nsk/stress/thread/thread006. |
| * VM testbase keywords: [stress, diehard, slow, nonconcurrent, quick] |
| * VM testbase readme: |
| * DESCRIPTION |
| * Try many threads of lower priority |
| * starting simultaneously. |
| * |
| * @run main/othervm nsk.stress.thread.thread006 500 2m 5s |
| */ |
| |
| package nsk.stress.thread; |
| |
| |
| import java.io.PrintStream; |
| |
| /** |
| * Try many threads of lower priority starting simultaneously. |
| */ |
| public class thread006 extends Thread { |
| /** |
| * Enable/disable printing of debugging info. |
| */ |
| private static boolean DEBUG_MODE = false; |
| |
| /** |
| * The minimal number of threads that the tested JVM must support. |
| * (This number should be specified by the command-line parameter. |
| */ |
| private static int THREADS_EXPECTED = 1000; |
| |
| /** |
| * Timeout (in milliseconds) after which all threads must halt. |
| */ |
| private static long TIMEOUT = 300000; // 5 minutes |
| |
| /** |
| * Wait few seconds to allow child threads actually start. |
| */ |
| private static long YIELD_TIME = 5000; // 5 seconds |
| |
| /** |
| * Once <code>arg</code> is ``XXXs'', or ``XXXm'', or ``XXXms'', |
| * return the given number of seconds, minutes, or milliseconds |
| * correspondingly. |
| */ |
| private static long parseTime(String arg) { |
| for (int i = arg.lastIndexOf("ms"); i > -1; ) |
| return Long.parseLong(arg.substring(0, i)); |
| for (int i = arg.lastIndexOf("s"); i > -1; ) |
| return Long.parseLong(arg.substring(0, i)) * 1000; |
| for (int i = arg.lastIndexOf("m"); i > -1; ) |
| return Long.parseLong(arg.substring(0, i)) * 60000; |
| throw new IllegalArgumentException( |
| "cannot recognize time scale: " + arg); |
| } |
| |
| /** |
| * Re-invoke to <code>run(args,out)</code> in a JCK style. |
| */ |
| public static void main(String args[]) { |
| int exitCode = run(args, System.out); |
| System.exit(exitCode + 95); |
| } |
| |
| /** |
| * JavaTest-like entry: <code>args[]</code> may reset |
| * <code>THREADS_EXPECTED</code>, <code>TIMEOUT</code> |
| * and <code>YIELD_TIME</code> values. |
| */ |
| public static int run(String args[], PrintStream out) { |
| if (args.length > 0) |
| THREADS_EXPECTED = Integer.parseInt(args[0]); |
| if (args.length > 1) |
| TIMEOUT = parseTime(args[1]); |
| if (args.length > 2) |
| YIELD_TIME = parseTime(args[2]); |
| if (args.length > 3) |
| DEBUG_MODE = args[3].toLowerCase().startsWith("-v"); |
| if (args.length > 4) { |
| out.println("#"); |
| out.println("# Too namy command-line arguments!"); |
| out.println("#"); |
| return 2; |
| } |
| |
| if (DEBUG_MODE) { |
| out.println("Start " + THREADS_EXPECTED + " threads of lower priority,"); |
| out.println("wait " + YIELD_TIME + " milliseconds to let them go,"); |
| out.println("and halt after " + TIMEOUT + " milliseconds:"); |
| } |
| |
| Thread thread[] = new Thread[THREADS_EXPECTED]; |
| for (int i = 0; i < THREADS_EXPECTED; i++) |
| try { |
| thread[i] = new thread006(); |
| thread[i].setPriority(Thread.MIN_PRIORITY); |
| if (thread[i].getPriority() == currentThread().getPriority()) { |
| out.println("*"); |
| out.println("* Sorry! -- The test cannot execute because"); |
| out.println("* it cannot create threads with lower priority"); |
| out.println("* than that executing run(args[],out) method."); |
| out.println("*"); |
| out.println("* However, since no JVM mistakes were found,"); |
| out.println("* the test finishes as PASSED."); |
| out.println("*"); |
| return 0; |
| } |
| thread[i].start(); |
| if (DEBUG_MODE) |
| out.println("Threads started: " + (i + 1)); |
| } catch (OutOfMemoryError oome) { |
| oome.printStackTrace(out); |
| out.println("#"); |
| out.println("# The test have FAILED:"); |
| out.println("# Only " + i + " threads could start,"); |
| out.println("# while at least " + THREADS_EXPECTED + |
| " were expected."); |
| out.println("#"); |
| return 2; |
| } |
| |
| // Actually start: |
| GO = true; |
| // ...and let them go: |
| try { |
| doSleep(YIELD_TIME); |
| } catch (InterruptedException ie) { |
| ie.printStackTrace(out); |
| out.println("#"); |
| out.println("# OOPS! Could not let threads actually start!"); |
| out.println("#"); |
| return 2; |
| } |
| STOP = true; |
| |
| if (DEBUG_MODE) |
| out.println("The test have PASSED."); |
| return 0; |
| } |
| |
| private static boolean GO = false; |
| private static boolean STOP = false; |
| |
| |
| /** |
| * The thread activity: do nothing special, but do not |
| * free CPU time so that the thread's memory could not |
| * be moved to swap file. |
| */ |
| public void run() { |
| while (!GO && !timeout()) |
| yield(); |
| while (!STOP && !timeout()) |
| ; |
| } |
| |
| private static long startTime = System.currentTimeMillis(); |
| |
| /** |
| * Check if timeout for this test is exceeded. |
| */ |
| private boolean timeout() { |
| long elapsedTime = System.currentTimeMillis() - startTime; |
| return elapsedTime > TIMEOUT; |
| } |
| |
| /** |
| * Yield to other threads for the given amount of |
| * <code>time</code> (milliseconds). |
| */ |
| private static void doSleep(long time) throws InterruptedException { |
| // |
| // Since Java 2, the method Thread.sleep() doesn't guarantee |
| // to yield to other threads. So, call Object.wait() to yield: |
| // |
| Object lock = new Object(); // local scope, nobody can notify it |
| synchronized (lock) { |
| lock.wait(time); |
| } |
| } |
| } |