do not exit if jobs are pending, add multiple loop test

src/main/java/com/oracle/avatar/js/eventloop/EventLoop.java

@@ -95,14 +95,15 @@ public final class EventLoop {
             this.hooks = hooks;
             this.refHandle = refHandle;
             this.unrefHandle = unrefHandle;
-            if (hooks.incrementAndGet() == 1) {
+
+            if (this.hooks.incrementAndGet() == 1) {
                 this.refHandle.send();
             }
         }
 
         @Override
         public void close() {
-            if (hooks.decrementAndGet() == 0) {
+            if (this.hooks.decrementAndGet() == 0) {
                 this.unrefHandle.send();
             }
         }
@@ -156,7 +157,10 @@ public final class EventLoop {
                 pendingException = null;
                 throw pex;
             }
-        } while (hooks.get() > 0 || eventQueue.peek() != null);
+        } while (hooks.get() > 0 ||
+                eventQueue.peek() != null ||
+                executor.hasActiveTasks() ||
+                executor.hasQueuedTasks());
     }
 
     /**

src/test/java/MultipleEventLoopTest.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2013, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.io.FileReader;
+import java.io.Reader;
+import java.util.Properties;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import com.oracle.avatar.js.eventloop.EventLoop;
+import com.oracle.avatar.js.eventloop.ThreadPool;
+import com.oracle.avatar.js.log.Logging;
+
+public class MultipleEventLoopTest {
+
+    @Test
+    public void testSubmit() throws Throwable {
+        final Properties properties = new Properties();
+        try (Reader reader = new FileReader("project.properties")) {
+            properties.load(reader);
+        }
+
+        final int CONCURRENCY = 256;
+        final Logging logging = new Logging(false);
+        final EventLoop[] loops = new EventLoop[CONCURRENCY];
+        final boolean[] didRun = new boolean[loops.length];
+        for (int i=0; i < loops.length; i++) {
+            didRun[i] = false;
+            final EventLoop loop = loops[i] = new EventLoop(
+                    properties.getProperty("source.compatible.version"),
+                    properties.getProperty("libuv.compatible.version"),
+                    logging,
+                    System.getProperty("user.dir"),
+                    i,
+                    ThreadPool.getInstance(),
+                    true);
+            final int fi = i;
+            try (EventLoop.Handle handle = loop.acquire()) {
+                loop.submit(new Runnable() {
+                    @Override
+                    public void run() {
+                        System.out.println("++ " + fi);
+                        try {
+                            Thread.sleep((long) (Math.random() * 1000));
+                            didRun[fi] = true;
+                        } catch (InterruptedException ex) {
+                        } finally {
+                            System.out.println("-- " + fi);
+                        }
+                    }
+                });
+            }
+        }
+
+        for (int i=0; i < loops.length; i++) {
+            loops[i].run();
+        }
+
+        for (int i=0; i < loops.length; i++) {
+            Assert.assertTrue(didRun[i]);
+        }
+    }
+
+    public static void main(String[] args) throws Throwable {
+        MultipleEventLoopTest test = new MultipleEventLoopTest();
+        test.testSubmit();
+    }
+}