--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/security/Security/SynchronizedAccess.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 1999, 2016, 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
+ * @bug 4162583 7054918 8130181
+ * @library ../testlibrary
+ * @summary Make sure Provider api implementations are synchronized properly
+ */
+
+import java.security.*;
+
+public class SynchronizedAccess {
+
+    public static void main(String[] args) throws Exception {
+        ProvidersSnapshot snapshot = ProvidersSnapshot.create();
+        try {
+            main0(args);
+        } finally {
+            snapshot.restore();
+        }
+    }
+
+    public static void main0(String[] args) throws Exception {
+        AccessorThread[] acc = new AccessorThread[200];
+        for (int i=0; i < acc.length; i++)
+            acc[i] = new AccessorThread("thread"+i);
+        for (int i=0; i < acc.length; i++)
+            acc[i].start();
+        for (int i=0; i < acc.length; i++)
+            acc[i].join();
+    }
+}
+
+class AccessorThread extends Thread {
+
+    public AccessorThread(String str) {
+        super(str);
+    }
+
+    public void run() {
+        Provider[] provs = new Provider[10];
+        for (int i=0; i < provs.length; i++)
+            provs[i] = new MyProvider("name"+i, "1", "test");
+
+        int rounds = 20;
+        while (rounds-- > 0) {
+            try {
+                for (int i=0; i<provs.length; i++) {
+                    Security.addProvider(provs[i]);
+                }
+                Signature sig = Signature.getInstance("sigalg");
+                for (int i=0; i<provs.length; i++) {
+                    Security.removeProvider("name"+i);
+                }
+                provs = Security.getProviders();
+            } catch (NoSuchAlgorithmException nsae) {
+            }
+
+            try {
+                Thread.sleep(5);
+            } catch (InterruptedException ie) {
+            }
+        } // while
+    }
+}
+
+class MyProvider extends Provider {
+    public MyProvider(String name, String version, String info) {
+        super(name, version, info);
+        put("Signature.sigalg", "sigimpl");
+    }
+}