/* * Copyright (c) 2020, 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 * @modules jdk.incubator.foreign java.base/jdk.internal.vm.annotation java.base/jdk.internal.misc * @key randomness * @run testng/othervm TestHandshake * @run testng/othervm -Xint TestHandshake * @run testng/othervm -XX:TieredStopAtLevel=1 TestHandshake * @run testng/othervm -XX:-TieredCompilation TestHandshake */ import jdk.incubator.foreign.MemoryAccess; import jdk.incubator.foreign.MemorySegment; import java.lang.invoke.MethodHandles; import java.lang.invoke.VarHandle; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.ThreadLocalRandom; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicLong; import org.testng.annotations.DataProvider; import org.testng.annotations.Test; import static org.testng.Assert.*; public class TestHandshake { static final int ITERATIONS = 5; static final int SEGMENT_SIZE = 1_000_000; static final int MAX_DELAY_MILLIS = 500; static final int MAX_EXECUTOR_WAIT_SECONDS = 10; static final int MAX_THREAD_SPIN_WAIT_MILLIS = 200; static final int NUM_ACCESSORS = Math.min(10, Runtime.getRuntime().availableProcessors()); static final AtomicLong start = new AtomicLong(); @Test(dataProvider = "accessors") public void testHandshake(String testName, AccessorFactory accessorFactory) throws InterruptedException { for (int it = 0 ; it < ITERATIONS ; it++) { MemorySegment segment = MemorySegment.allocateNative(SEGMENT_SIZE).share(); System.out.println("ITERATION " + it); ExecutorService accessExecutor = Executors.newCachedThreadPool(); start.set(System.currentTimeMillis()); for (int i = 0; i < NUM_ACCESSORS ; i++) { accessExecutor.execute(accessorFactory.make(i, segment)); } int delay = ThreadLocalRandom.current().nextInt(MAX_DELAY_MILLIS); System.out.println("Starting handshaker with delay set to " + delay + " millis"); Thread.sleep(delay); accessExecutor.execute(new Handshaker(segment)); accessExecutor.shutdown(); assertTrue(accessExecutor.awaitTermination(MAX_EXECUTOR_WAIT_SECONDS, TimeUnit.SECONDS)); assertTrue(!segment.isAlive()); } } static abstract class AbstractSegmentAccessor implements Runnable { final MemorySegment segment; final int id; AbstractSegmentAccessor(int id, MemorySegment segment) { this.id = id; this.segment = segment; } @Override public final void run() { outer: while (segment.isAlive()) { try { doAccess(); } catch (IllegalStateException ex) { long delay = System.currentTimeMillis() - start.get(); System.out.println("Accessor #" + id + " suspending - delay (ms): " + delay); backoff(); delay = System.currentTimeMillis() - start.get(); System.out.println("Accessor #" + id + " resuming - delay (ms): " + delay); continue outer; } } long delay = System.currentTimeMillis() - start.get(); System.out.println("Accessor #" + id + " terminated - delay (ms): " + delay); cleanup(); } abstract void doAccess(); void cleanup() {} private void backoff() { try { Thread.sleep(ThreadLocalRandom.current().nextInt(MAX_THREAD_SPIN_WAIT_MILLIS)); } catch (InterruptedException ex) { throw new AssertionError(ex); } } } static abstract class AbstractBufferAccessor extends AbstractSegmentAccessor { final ByteBuffer bb; AbstractBufferAccessor(int id, MemorySegment segment) { super(id, segment); this.bb = segment.asByteBuffer(); } } static class SegmentAccessor extends AbstractSegmentAccessor { SegmentAccessor(int id, MemorySegment segment) { super(id, segment); } @Override void doAccess() { int sum = 0; for (int i = 0; i < segment.byteSize(); i++) { sum += MemoryAccess.getByteAtOffset(segment, i); } } } static class SegmentCopyAccessor extends AbstractSegmentAccessor { MemorySegment first, second; SegmentCopyAccessor(int id, MemorySegment segment) { super(id, segment); long split = segment.byteSize() / 2; first = segment.asSlice(0, split); second = segment.asSlice(split); } @Override public void doAccess() { first.copyFrom(second); } } static class SegmentFillAccessor extends AbstractSegmentAccessor { SegmentFillAccessor(int id, MemorySegment segment) { super(id, segment); } @Override public void doAccess() { segment.fill((byte) ThreadLocalRandom.current().nextInt(10)); } } static class SegmentMismatchAccessor extends AbstractSegmentAccessor { final MemorySegment copy; SegmentMismatchAccessor(int id, MemorySegment segment) { super(id, segment); this.copy = MemorySegment.allocateNative(SEGMENT_SIZE).share(); copy.copyFrom(segment); MemoryAccess.setByteAtOffset(copy, ThreadLocalRandom.current().nextInt(SEGMENT_SIZE), (byte)42); } @Override public void doAccess() { segment.mismatch(copy); } @Override void cleanup() { copy.close(); } } static class BufferAccessor extends AbstractBufferAccessor { BufferAccessor(int id, MemorySegment segment) { super(id, segment); } @Override public void doAccess() { int sum = 0; for (int i = 0; i < bb.capacity(); i++) { sum += bb.get(i); } } } static class BufferHandleAccessor extends AbstractBufferAccessor { static VarHandle handle = MethodHandles.byteBufferViewVarHandle(short[].class, ByteOrder.nativeOrder()); public BufferHandleAccessor(int id, MemorySegment segment) { super(id, segment); } @Override public void doAccess() { int sum = 0; for (int i = 0; i < bb.capacity() / 2; i++) { sum += (short) handle.get(bb, i); } } }; static class Handshaker implements Runnable { final MemorySegment segment; Handshaker(MemorySegment segment) { this.segment = segment; } @Override public void run() { while (true) { try { segment.close(); break; } catch (IllegalStateException ex) { Thread.onSpinWait(); } } long delay = System.currentTimeMillis() - start.get(); System.out.println("Segment closed - delay (ms): " + delay); } } interface AccessorFactory { AbstractSegmentAccessor make(int id, MemorySegment segment); } @DataProvider static Object[][] accessors() { return new Object[][] { { "SegmentAccessor", (AccessorFactory)SegmentAccessor::new }, { "SegmentCopyAccessor", (AccessorFactory)SegmentCopyAccessor::new }, { "SegmentMismatchAccessor", (AccessorFactory)SegmentMismatchAccessor::new }, { "SegmentFillAccessor", (AccessorFactory)SegmentFillAccessor::new }, { "BufferAccessor", (AccessorFactory)BufferAccessor::new }, { "BufferHandleAccessor", (AccessorFactory)BufferHandleAccessor::new } }; } }