diff -r 2c3cc4b01880 -r c16ac7a2eba4 test/jdk/jdk/jfr/api/consumer/recordingstream/TestClose.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/api/consumer/recordingstream/TestClose.java	Wed Oct 30 19:43:52 2019 +0100
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+package jdk.jfr.api.consumer.recordingstream;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicLong;
+
+import jdk.jfr.Event;
+import jdk.jfr.consumer.RecordingStream;
+
+/**
+ * @test
+ * @summary Tests RecordingStream::close()
+ * @key jfr
+ * @requires vm.hasJFR
+ * @library /test/lib
+ * @run main/othervm jdk.jfr.api.consumer.recordingstream.TestClose
+ */
+public class TestClose {
+
+    private static class CloseEvent extends Event {
+    }
+
+    public static void main(String... args) throws Exception {
+        testCloseUnstarted();
+        testCloseStarted();
+        testCloseTwice();
+        testCloseStreaming();
+        testCloseMySelf();
+    }
+
+    private static void testCloseMySelf() throws Exception {
+        log("Entering testCloseMySelf()");
+        CountDownLatch l1 = new CountDownLatch(1);
+        CountDownLatch l2 = new CountDownLatch(1);
+        RecordingStream r = new RecordingStream();
+        r.onEvent(e -> {
+            try {
+                l1.await();
+                r.close();
+                l2.countDown();
+            } catch (InterruptedException ie) {
+                throw new Error(ie);
+            }
+        });
+        r.startAsync();
+        CloseEvent c = new CloseEvent();
+        c.commit();
+        l1.countDown();
+        l2.await();
+        log("Leaving testCloseMySelf()");
+    }
+
+    private static void testCloseStreaming() throws Exception {
+        log("Entering testCloseStreaming()");
+        CountDownLatch streaming = new CountDownLatch(1);
+        RecordingStream r = new RecordingStream();
+        AtomicLong count = new AtomicLong();
+        r.onEvent(e -> {
+            if (count.incrementAndGet() > 100) {
+                streaming.countDown();
+            }
+        });
+        r.startAsync();
+        var streamingLoop = CompletableFuture.runAsync(() -> {
+            while (true) {
+                CloseEvent c = new CloseEvent();
+                c.commit();
+            }
+        });
+        streaming.await();
+        r.close();
+        streamingLoop.cancel(true);
+        log("Leaving testCloseStreaming()");
+    }
+
+    private static void testCloseStarted() {
+        log("Entering testCloseStarted()");
+        RecordingStream r = new RecordingStream();
+        r.startAsync();
+        r.close();
+        log("Leaving testCloseStarted()");
+    }
+
+    private static void testCloseUnstarted() {
+        log("Entering testCloseUnstarted()");
+        RecordingStream r = new RecordingStream();
+        r.close();
+        log("Leaving testCloseUnstarted()");
+    }
+
+    private static void testCloseTwice() {
+        log("Entering testCloseTwice()");
+        RecordingStream r = new RecordingStream();
+        r.startAsync();
+        r.close();
+        r.close();
+        log("Leaving testCloseTwice()");
+    }
+
+    private static void log(String msg) {
+        System.out.println(msg);
+    }
+}