130 lines
4.4 KiB
Java
130 lines
4.4 KiB
Java
/*
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* Copyright (c) 2019, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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/*
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* @test HandshakeSuspendExitTest
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* @summary This test tries to stress the handshakes with new and exiting threads while suspending them.
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* @library /testlibrary /test/lib
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* @build HandshakeSuspendExitTest
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:GuaranteedSafepointInterval=1 -XX:+HandshakeALot HandshakeSuspendExitTest
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*/
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import jvmti.JVMTIUtils;
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public class HandshakeSuspendExitTest implements Runnable {
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static Thread[] _suspend_threads = new Thread[16];
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static volatile boolean _exit_now = false;
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static java.util.concurrent.Semaphore _sem = new java.util.concurrent.Semaphore(0);
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static void suspendThread(Thread t) {
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try {
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JVMTIUtils.suspendThread(t);
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} catch (JVMTIUtils.JvmtiException e) {
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if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_SUSPENDED
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&& e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE) {
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throw e;
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}
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}
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}
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static void resumeThread(Thread t) {
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try {
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JVMTIUtils.resumeThread(t);
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} catch (JVMTIUtils.JvmtiException e) {
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if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_SUSPENDED
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&& e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE) {
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throw e;
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}
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}
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}
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@Override
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public void run() {
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_sem.release();
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while (!_exit_now) {
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// Leave last 2 threads running.
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for (int i = 0; i < _suspend_threads.length - 2; i++) {
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if (Thread.currentThread() != _suspend_threads[i]) {
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suspendThread(_suspend_threads[i]);
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resumeThread(_suspend_threads[i]);
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}
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}
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}
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_sem.release();
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}
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public static void main(String... args) throws Exception {
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HandshakeSuspendExitTest test = new HandshakeSuspendExitTest();
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// Fire-up suspend threads.
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for (int i = 0; i < _suspend_threads.length; i++) {
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_suspend_threads[i] = new Thread(test);
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}
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for (int i = 0; i < _suspend_threads.length; i++) {
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_suspend_threads[i].start();
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}
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// Wait for all suspend-threads to start looping.
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for (Thread thr : _suspend_threads) {
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_sem.acquire();
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}
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// Fire-up exiting threads.
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Thread[] exit_threads = new Thread[128];
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for (int i = 0; i < exit_threads.length; i++) {
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exit_threads[i] = new Thread();
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exit_threads[i].start();
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}
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// Try to suspend them.
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for (Thread thr : exit_threads) {
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suspendThread(thr);
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}
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for (Thread thr : exit_threads) {
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resumeThread(thr);
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}
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// Start exit and join.
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_exit_now = true;
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int waiting = _suspend_threads.length;
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do {
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// Resume any worker threads that might have suspended
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// each other at exactly the same time so they can see
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// _exit_now and check in via the semaphore.
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for (Thread thr : _suspend_threads) {
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resumeThread(thr);
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}
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while (_sem.tryAcquire()) {
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--waiting;
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}
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} while (waiting > 0);
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for (Thread thr : _suspend_threads) {
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thr.join();
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}
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for (Thread thr : exit_threads) {
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thr.join();
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}
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}
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}
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