undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/lang/Thread/virtual/stress/PingPong.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2020, 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 id=sq
+ * @summary Stress test virtual threads with a SynchronousQueue
+ * @requires vm.debug != true
+ * @run main PingPong SQ 500000
+ */
+
+/*
+ * @test id=ltq
+ * @summary Stress test virtual threads with a LinkedTransferQueue
+ * @requires vm.debug != true
+ * @run main PingPong LTQ 500000
+ */
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.concurrent.SynchronousQueue;
+import java.util.concurrent.LinkedTransferQueue;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class PingPong {
+
+    public static void main(String[] args) throws Exception {
+        Exchanger<String> queue;
+        int iterations;
+        if (args.length == 0) {
+            queue = new LTQExchanger<>();
+            iterations = 10_000_000;
+        } else {
+            if (args[0].equals("SQ")) {
+                queue = new SQExchanger<>();
+            } else {
+                queue = new LTQExchanger<>();
+            }
+            iterations = Integer.parseInt(args[1]);
+        }
+
+        AtomicInteger count1 = new AtomicInteger();
+        AtomicInteger count2 = new AtomicInteger();
+
+        Thread t1 = Thread.ofVirtual().start(() -> {
+            try {
+                while (count1.incrementAndGet() < iterations) {
+                    queue.transfer("hello");
+                    String reply = queue.take();
+                    if (!"ack".equals(reply)) {
+                        throw new RuntimeException("reply=" + reply);
+                    }
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        });
+
+        Thread t2 = Thread.ofVirtual().start(() -> {
+            try {
+                while (count2.incrementAndGet() < iterations) {
+                    String message = queue.take();
+                    if (!"hello".equals(message)) {
+                        throw new RuntimeException("message=" + message);
+                    }
+                    queue.transfer("ack");
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        });
+
+        boolean terminated;
+        do {
+            terminated = t1.join(Duration.ofMillis(500));
+            if (terminated) {
+                terminated = t2.join(Duration.ofMillis(500));
+            }
+            System.out.format("%s => T1 %d of %d, T2 %d of %d%n",
+                    Instant.now(), count1.get(), iterations, count2.get(), iterations);
+        } while (!terminated);
+    }
+
+    interface Exchanger<E> {
+        void transfer (E value) throws InterruptedException;
+        E take() throws InterruptedException;
+    }
+
+    static class SQExchanger<E> implements Exchanger<E> {
+        private final SynchronousQueue<E> queue = new SynchronousQueue<>();
+        @Override
+        public void transfer(E value) throws InterruptedException {
+            queue.put(value);
+        }
+        @Override
+        public E take() throws InterruptedException {
+            return queue.take();
+        }
+    }
+
+    static class LTQExchanger<E> implements Exchanger<E> {
+        private final LinkedTransferQueue<E> queue = new LinkedTransferQueue<>();
+        @Override
+        public void transfer(E value) throws InterruptedException {
+            queue.transfer(value);
+        }
+        @Override
+        public E take() throws InterruptedException {
+            return queue.take();
+        }
+    }
+}