/** * Copyright 2015 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS-IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.apphosting.tests.usercode.testservlets; import java.io.IOException; import java.util.concurrent.LinkedTransferQueue; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Tests various functions that read number of cores internally. * Copycat from other tests found nearby. * */ public class MulticoreTestServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); boolean indirect = Boolean.parseBoolean(request.getParameter("indirect")); if (indirect) { response.getWriter().print(tryLinkedTransferQueue()); } else { response.getWriter().print(Integer.toString(getCoresDirectlyTest())); } } private int getCoresDirectlyTest() { return Runtime.getRuntime().availableProcessors(); } private String tryLinkedTransferQueue() { // This class is known to call native Runtime.availableProcessors() rather than the our // override. Constructing is enough to call it. LinkedTransferQueue<String> queue = new LinkedTransferQueue<>(); // Some classes are known to be loaded early, so their construction does not trigger security // violation because the sysconf() calls were made before sandboxing happenes. These are // SynchronousQueue, ConcurrentHashMap, and possibly others. return "No syscall violation."; } }