94 lines
3.7 KiB
Java
94 lines
3.7 KiB
Java
/*
|
|
* Copyright (c) 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 HandshakeWalkSuspendExitTest
|
|
* @summary This test tries to stress the handshakes with new and exiting threads while suspending them.
|
|
* @library /testlibrary /test/lib
|
|
* @build HandshakeWalkSuspendExitTest
|
|
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
|
|
* sun.hotspot.WhiteBox$WhiteBoxPermission
|
|
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI HandshakeWalkSuspendExitTest
|
|
*/
|
|
|
|
import jdk.test.lib.Asserts;
|
|
import sun.hotspot.WhiteBox;
|
|
|
|
public class HandshakeWalkSuspendExitTest implements Runnable {
|
|
|
|
static final int _test_threads = 8;
|
|
static final int _test_exit_threads = 128;
|
|
static Thread[] _threads = new Thread[_test_threads];
|
|
static volatile boolean exit_now = false;
|
|
static java.util.concurrent.Semaphore _sem = new java.util.concurrent.Semaphore(0);
|
|
|
|
@Override
|
|
public void run() {
|
|
WhiteBox wb = WhiteBox.getWhiteBox();
|
|
while (!exit_now) {
|
|
_sem.release();
|
|
// We only suspend threads on even index and not ourself.
|
|
// Otherwise we can accidentially suspend all threads.
|
|
for (int i = 0; i < _threads.length; i += 2) {
|
|
wb.handshakeWalkStack(null /* ignored */, true /* stackwalk all threads */);
|
|
if (Thread.currentThread() != _threads[i]) {
|
|
_threads[i].suspend();
|
|
_threads[i].resume();
|
|
}
|
|
}
|
|
for (int i = 0; i < _threads.length; i += 2) {
|
|
wb.handshakeWalkStack(_threads[i] /* thread to stackwalk */, false /* stackwalk one thread */);
|
|
if (Thread.currentThread() != _threads[i]) {
|
|
_threads[i].suspend();
|
|
_threads[i].resume();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public static void main(String... args) throws Exception {
|
|
HandshakeWalkSuspendExitTest test = new HandshakeWalkSuspendExitTest();
|
|
|
|
for (int i = 0; i < _threads.length; i++) {
|
|
_threads[i] = new Thread(test);
|
|
_threads[i].start();
|
|
}
|
|
for (int i = 0; i < _test_threads; i++) {
|
|
_sem.acquire();
|
|
}
|
|
Thread[] exit_threads = new Thread[_test_exit_threads];
|
|
for (int i = 0; i < _test_exit_threads; i++) {
|
|
exit_threads[i] = new Thread(new Runnable() { public void run() {} });
|
|
exit_threads[i].start();
|
|
}
|
|
exit_now = true;
|
|
for (int i = 0; i < _threads.length; i++) {
|
|
_threads[i].join();
|
|
}
|
|
for (int i = 0; i < exit_threads.length; i++) {
|
|
exit_threads[i].join();
|
|
}
|
|
}
|
|
}
|