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/CompletableFutureTimedGet.java

@@ -0,0 +1,106 @@
+/*
+ * 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
+ * @summary Stress parking with CompletableFuture timed get
+ * @requires vm.debug != true & vm.continuations
+ * @run main/othervm -Xmx1g CompletableFutureTimedGet 100000
+ */
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class CompletableFutureTimedGet {
+
+    static final String RESULT = "foo";
+
+    public static void main(String... args) throws InterruptedException {
+        int threadCount = 250_000;
+        if (args.length > 0) {
+            threadCount = Integer.parseInt(args[0]);
+        }
+
+        // the count of the number of threads that complete successfully
+        AtomicInteger completed = new AtomicInteger();
+
+        // list of futures and threads
+        List<CompletableFuture<String>> futures = new ArrayList<>();
+        List<Thread> threads = new ArrayList<>();
+
+        // start threads that wait with timeout for a result
+        for (int i = 0; i < threadCount; i++) {
+            var future = new CompletableFuture<String>();
+            futures.add(future);
+
+            // start a thread that uses a timed-get to wait for the result
+            Thread thread = Thread.ofVirtual().start(() -> {
+                try {
+                    String result = future.get(1, TimeUnit.DAYS);
+                    if (!RESULT.equals(result)) {
+                        throw new RuntimeException("result=" + result);
+                    }
+                    completed.incrementAndGet();
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            });
+            threads.add(thread);
+        }
+
+        // sets the result, which will unpark waiting threads
+        futures.forEach(f -> f.complete(RESULT));
+
+        // wait for all threads to terminate
+        long lastTimestamp = System.currentTimeMillis();
+        boolean done;
+        do {
+            done = true;
+            for (Thread t : threads) {
+                if (!t.join(Duration.ofSeconds(1))) {
+                    done = false;
+                }
+            }
+
+            // print trace message so the output tracks progress
+            long currentTime = System.currentTimeMillis();
+            if (done || ((currentTime - lastTimestamp) > 500)) {
+                System.out.format("%s => completed %d of %d%n",
+                        Instant.now(), completed.get(), threadCount);
+                lastTimestamp = currentTime;
+            }
+
+        } while (!done);
+
+        // all tasks should have completed successfully
+        int completedCount = completed.get();
+        if (completedCount != threadCount) {
+            throw new RuntimeException("completed = " + completedCount);
+        }
+    }
+}