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/*
* Copyright (c) 2024, 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
* @requires vm.compiler2.enabled
* @modules java.base/jdk.internal.vm.annotation java.base/jdk.internal.misc
* @key randomness
* @library /test/lib
*
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
*
* @run testng/othervm
* -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI
* -XX:CompileCommand=dontinline,TestConcurrentClose$SegmentAccessor::doAccess
* -Xbatch
* TestConcurrentClose
*/
import jdk.test.whitebox.WhiteBox;
import org.testng.annotations.Test;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.lang.reflect.Method;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import static java.lang.foreign.ValueLayout.JAVA_BYTE;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
public class TestConcurrentClose {
static final WhiteBox WB = WhiteBox.getWhiteBox();
static final Method DO_ACCESS_METHOD;
static final int C2_COMPILED_LEVEL = 4;
static {
try {
DO_ACCESS_METHOD = SegmentAccessor.class.getDeclaredMethod("doAccess");
} catch (ReflectiveOperationException e) {
throw new ExceptionInInitializerError(e);
}
}
static final int ITERATIONS = 5;
static final int SEGMENT_SIZE = 10_000;
static final int MAX_EXECUTOR_WAIT_SECONDS = 60;
static final int NUM_ACCESSORS = 50;
static final AtomicLong start = new AtomicLong();
static final AtomicBoolean started = new AtomicBoolean();
@Test
public void testHandshake() throws InterruptedException {
for (int it = 0; it < ITERATIONS; it++) {
System.out.println("ITERATION " + it + " - starting");
ExecutorService accessExecutor = Executors.newCachedThreadPool();
start.set(System.currentTimeMillis());
started.set(false);
CountDownLatch startClosureLatch = new CountDownLatch(1);
for (int i = 0; i < NUM_ACCESSORS ; i++) {
Arena arena = Arena.ofShared();
MemorySegment segment = arena.allocate(SEGMENT_SIZE, 1);
accessExecutor.execute(new SegmentAccessor(i, segment));
accessExecutor.execute(new Closer(i, startClosureLatch, arena));
}
awaitCompilation();
long closeDelay = System.currentTimeMillis() - start.get();
System.out.println("Starting closers after delay of " + closeDelay + " millis");
startClosureLatch.countDown();
accessExecutor.shutdown();
assertTrue(accessExecutor.awaitTermination(MAX_EXECUTOR_WAIT_SECONDS, TimeUnit.SECONDS));
long finishDelay = System.currentTimeMillis() - start.get();
System.out.println("ITERATION " + it + " - finished, after " + finishDelay + "milis");
}
}
static class SegmentAccessor implements Runnable {
final MemorySegment segment;
final int id;
boolean hasFailed = false;
SegmentAccessor(int id, MemorySegment segment) {
this.id = id;
this.segment = segment;
}
@Override
public final void run() {
start("Accessor #" + id);
while (segment.scope().isAlive()) {
try {
doAccess();
} catch (IllegalStateException ex) {
// scope was closed, loop should exit
assertFalse(hasFailed);
hasFailed = true;
}
}
long delay = System.currentTimeMillis() - start.get();
System.out.println("Accessor #" + id + " terminated - elapsed (ms): " + delay);
}
// keep this out of line, so it has a chance to be fully C2 compiled
private int doAccess() {
int sum = 0;
for (int i = 0; i < segment.byteSize(); i++) {
sum += segment.get(JAVA_BYTE, i);
}
return sum;
}
}
static class Closer implements Runnable {
final int id;
final Arena arena;
final CountDownLatch startLatch;
Closer(int id, CountDownLatch startLatch, Arena arena) {
this.id = id;
this.arena = arena;
this.startLatch = startLatch;
}
@Override
public void run() {
start("Closer #" + id);
try {
// try to close all at the same time, to simulate concurrent
// closures of unrelated arenas
startLatch.await();
} catch (InterruptedException e) {
throw new RuntimeException("Unexpected interruption", e);
}
arena.close(); // This should NOT throw
long delay = System.currentTimeMillis() - start.get();
System.out.println("Closer #" + id + "terminated - elapsed (ms): " + delay);
}
}
static void start(String name) {
if (started.compareAndSet(false, true)) {
long delay = System.currentTimeMillis() - start.get();
System.out.println("Started first thread: " + name + " ; elapsed (ms): " + delay);
}
}
private static void awaitCompilation() throws InterruptedException {
while (WB.getMethodCompilationLevel(DO_ACCESS_METHOD, false) != C2_COMPILED_LEVEL) {
Thread.sleep(1000);
}
}
}
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