| /* |
| * Copyright (c) 2010, 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. |
| */ |
| |
| import java.util.Properties; |
| import java.util.concurrent.CyclicBarrier; |
| import java.util.concurrent.BrokenBarrierException; |
| import java.io.IOException; |
| import java.net.URL; |
| |
| /* @test |
| * @bug 6977738 8029891 |
| * @summary Test ClassLoader.getResource() that should not deadlock |
| # if another thread is holding the system properties object |
| * |
| * @build GetResource |
| * @run main GetResource |
| */ |
| |
| public class GetResource { |
| CyclicBarrier go = new CyclicBarrier(2); |
| CyclicBarrier done = new CyclicBarrier(2); |
| Thread t1, t2; |
| public GetResource() { |
| t1 = new Thread() { |
| public void run() { |
| Properties prop = System.getProperties(); |
| synchronized (prop) { |
| System.out.println("Thread 1 ready"); |
| try { |
| go.await(); |
| prop.put("property", "value"); |
| prop.store(System.out, ""); |
| done.await(); // keep holding the lock until t2 finishes |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } catch (BrokenBarrierException e) { |
| throw new RuntimeException(e); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| System.out.println("Thread 1 exits"); |
| } |
| }; |
| |
| t2 = new Thread() { |
| public void run() { |
| System.out.println("Thread 2 ready"); |
| try { |
| go.await(); // wait until t1 holds the lock of the system properties |
| |
| URL u1 = Thread.currentThread().getContextClassLoader().getResource("unknownresource"); |
| done.await(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } catch (BrokenBarrierException e) { |
| throw new RuntimeException(e); |
| } |
| System.out.println("Thread 2 exits"); |
| } |
| }; |
| } |
| |
| public void run() throws Exception { |
| t1.start(); |
| t2.start(); |
| try { |
| t1.join(); |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| throw e; |
| } |
| try { |
| t2.join(); |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| throw e; |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| new GetResource().run(); |
| } |
| } |