8078490: Missed submissions in ForkJoinPool

Reviewed-by: psandoz, shade, martin, chegar

src/share/classes/java/util/concurrent/ForkJoinPool.java

@@ -2406,7 +2406,7 @@ public class ForkJoinPool extends AbstractExecutorService {
                 int j = ((am & s) << ASHIFT) + ABASE;
                 U.putOrderedObject(a, j, task);
                 U.putOrderedInt(q, QTOP, s + 1);
-                U.putOrderedInt(q, QLOCK, 0);
+                U.putIntVolatile(q, QLOCK, 0);
                 if (n <= 1)
                     signalWork(ws, q);
                 return;

test/java/util/concurrent/forkjoin/SubmissionTest.java

+/*
+ * Copyright (c) 2015, 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.
+ */
+
+import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/*
+ * @test
+ * @bug 8078490
+ * @summary Test submission and execution of task without joining
+ */
+public class SubmissionTest {
+    public static void main(String[] args) throws Throwable {
+        final ForkJoinPool e = new ForkJoinPool(1);
+        final AtomicBoolean b = new AtomicBoolean();
+        final Runnable setFalse = () -> b.set(false);
+        for (int i = 0; i < 100000; i++) {
+            b.set(true);
+            e.execute(setFalse);
+            long st = System.nanoTime();
+            while (b.get()) {
+                if (System.nanoTime() - st >= TimeUnit.SECONDS.toNanos(10)) {
+                    throw new RuntimeException("Submitted task failed to execute");
+                }
+            }
+        }
+    }
+}