| /* |
| * Copyright (c) 1998, 2017, 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 4118056 |
| * @key intermittent |
| * |
| * @summary synopsis: Distributed Garbage Collection Deadlock |
| * @author Laird Dornin |
| * |
| * @library ../../testlibrary |
| * @modules java.rmi/sun.rmi.registry |
| * java.rmi/sun.rmi.server |
| * java.rmi/sun.rmi.transport |
| * java.rmi/sun.rmi.transport.tcp |
| * @build TestLibrary Test TestImpl RegistryVM RegistryRunner |
| * @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock |
| */ |
| |
| /* This test attempts to cause a deadlock between the rmi leaseChecker |
| * thread and a thread that is servicing a dgc clean call. Before the |
| * fix for this bug was implemented, deadlock could occur when the |
| * leaseChecker held the lock on the lease table and the clean thread |
| * held the lock on a target x. The clean thread would attempt to get |
| * the lock on the leaseTable to do DGCImpl.unregisterTarget and the |
| * leaseChecker would attempt to get the lock on x to do |
| * Target.vmidDead. Each thread held a resource that the other thread |
| * was attempting to lock. |
| * |
| * This test causes the above conditions to occur and waits to see if |
| * a given set of remote calls finishes "quickly enough." |
| */ |
| |
| import java.rmi.*; |
| import java.io.*; |
| |
| public class DGCDeadLock implements Runnable { |
| final static public int HOLD_TARGET_TIME = 25000; |
| public static final double TEST_FAIL_TIME = |
| (HOLD_TARGET_TIME + 30000) * TestLibrary.getTimeoutFactor(); |
| public static volatile boolean finished = false; |
| static final DGCDeadLock test = new DGCDeadLock(); |
| static volatile int registryPort = -1; |
| |
| static { |
| System.setProperty("sun.rmi.transport.cleanInterval", "50"); |
| } |
| |
| static public void main(String[] args) { |
| |
| RegistryVM testImplVM = null; |
| |
| System.err.println("\nregression test for 4118056\n"); |
| TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager"); |
| |
| try { |
| String options = " --add-opens java.rmi/sun.rmi.transport=ALL-UNNAMED" + |
| " -Djava.rmi.dgc.leaseValue=500000" + |
| " -Dsun.rmi.dgc.checkInterval=" + |
| (HOLD_TARGET_TIME - 5000); |
| |
| testImplVM = RegistryVM.createRegistryVMWithRunner("TestImpl", options); |
| testImplVM.start(); |
| registryPort = testImplVM.getPort(); |
| |
| synchronized (test) { |
| Thread t = new Thread(test); |
| t.setDaemon(true); |
| t.start(); |
| |
| // wait for the remote calls to take place |
| test.wait((long)TEST_FAIL_TIME); |
| } |
| |
| if (!finished) { |
| TestLibrary.bomb("Test failed, had exception or exercise" + |
| " routines took too long to " + |
| "execute"); |
| } |
| System.err.println("Test passed, exercises " + |
| "finished in time."); |
| |
| } catch (Exception e) { |
| TestLibrary.bomb("test failed in main()", e); |
| } finally { |
| if (testImplVM != null) { |
| testImplVM.cleanup(); |
| testImplVM = null; |
| } |
| } |
| } |
| |
| public void run() { |
| try { |
| String echo = null; |
| |
| // create a test client |
| Test foo = (Test) Naming.lookup("rmi://:" + |
| registryPort + |
| "/Foo"); |
| echo = foo.echo("Hello world"); |
| System.err.println("Test object created."); |
| |
| /* give TestImpl time to lock the target in the |
| * object table and any dirtys finish. |
| */ |
| Thread.currentThread().sleep(5000); |
| |
| //unreference "Foo" |
| foo = null; |
| |
| //garbage collect and finalize foo |
| Runtime.getRuntime().gc(); |
| Runtime.getRuntime().runFinalization(); |
| |
| //import "Bar" |
| Test bar = (Test) Naming.lookup("rmi://:" + |
| registryPort + |
| "/Bar"); |
| |
| /* infinite loop to show the liveness of Client, |
| * if we have deadlock remote call will not return |
| */ |
| try { |
| for (int i = 0; i < 500; i++) { |
| echo = bar.echo("Remote call" + i); |
| Thread.sleep(10); |
| } |
| |
| // flag exercises finished |
| finished = true; |
| |
| } catch (RemoteException e) { |
| System.err.println("catch RemoteException"); |
| e.printStackTrace(); |
| } |
| |
| } catch (Exception e) { |
| TestLibrary.bomb("test failed in run()", e); |
| } finally { |
| synchronized(this) { |
| notify(); |
| } |
| } |
| } |
| } |