1 /*
2 * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /* @test
25 * @bug 4118056
26 *
27 * @summary synopsis: Distributed Garbage Collection Deadlock
28 * @author Laird Dornin
29 *
30 * @library ../../testlibrary
31 * @build DGCDeadLock
32 * @build Test
33 * @build TestImpl
34 * @build TestImpl_Stub
35 * @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock
36 */
37
38 /* This test attempts to cause a deadlock between the rmi leaseChecker
39 * thread and a thread that is servicing a dgc clean call. Before the
40 * fix for this bug was implemented, deadlock could occur when the
41 * leaseChecker held the lock on the lease table and the clean thread
42 * held the lock on a target x. The clean thread would attempt to get
43 * the lock on the leaseTable to do DGCImpl.unregisterTarget and the
44 * leaseChecker would attempt to get the lock on x to do
45 * Target.vmidDead. Each thread held a resource that the other thread
46 * was attempting to lock.
47 *
48 * This test causes the above conditions to occur and waits to see if
49 * a given set of remote calls finishes "quickly enough."
50 */
51
52 import java.rmi.*;
53 import java.io.*;
54
55 public class DGCDeadLock implements Runnable {
56
57 final static public int HOLD_TARGET_TIME = 25000;
58 public static int TEST_FAIL_TIME = HOLD_TARGET_TIME + 30000;
59 public static boolean finished = false;
60 static DGCDeadLock test = new DGCDeadLock();
61
62 static {
63 System.setProperty("sun.rmi.transport.cleanInterval", "50");
64 }
65
66 static public void main(String[] args) {
67
68 JavaVM testImplVM = null;
69
70 System.err.println("\nregression test for 4118056\n");
71 TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager");
72
73 try {
74 String options = " -Djava.security.policy=" +
75 TestParams.defaultPolicy +
76 " -Djava.rmi.dgc.leaseValue=500000" +
77 " -Dsun.rmi.dgc.checkInterval=" +
78 (HOLD_TARGET_TIME - 5000) + "";
79
80 testImplVM = new JavaVM("TestImpl", options, "");
81 testImplVM.start();
82
83 synchronized (test) {
84 Thread t = new Thread(test);
85 t.setDaemon(true);
86 t.start();
87
88 // wait for the remote calls to take place
89 test.wait(TEST_FAIL_TIME);
90 }
91
92 if (!finished) {
93 TestLibrary.bomb("Test failed, had exception or exercise" +
94 " routines took too long to " +
95 "execute");
96 }
97 System.err.println("Test passed, exercises " +
98 "finished in time.");
99
100 } catch (Exception e) {
101 testImplVM = null;
102 TestLibrary.bomb("test failed", e);
103 }
104 }
105
106 public void run() {
107 try {
108 String echo = null;
109
110 // give the test remote object time to initialize.
111 Thread.currentThread().sleep(8000);
112
113 // create a test client
114 Test foo = (Test) Naming.lookup("rmi://:" +
115 TestLibrary.REGISTRY_PORT +
116 "/Foo");
117 echo = foo.echo("Hello world");
118 System.err.println("Test object created.");
119
120 /* give TestImpl time to lock the target in the
121 * object table and any dirtys finish.
122 */
123 Thread.currentThread().sleep(5000);
124
125 //unreference "Foo"
126 foo = null;
127
128 //garbage collect and finalize foo
129 Runtime.getRuntime().gc();
130 Runtime.getRuntime().runFinalization();
131
132 //import "Bar"
133 Test bar = (Test) Naming.lookup("rmi://:" +
134 TestLibrary.REGISTRY_PORT +
135 "/Bar");
136
137 /* infinite loop to show the liveness of Client,
138 * if we have deadlock remote call will not return
139 */
140 try {
141 for (int i = 0; i < 500; i++) {
142 echo = bar.echo("Remote call" + i);
143 Thread.sleep(10);
144 }
145
146 // flag exercises finished
147 finished = true;
148
149 } catch (RemoteException e) {
150 }
151
152 } catch (Exception e) {
153 TestLibrary.bomb("test failed", e);
154 } finally {
155 }
156 }
157 }