1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 */
22
23 /*
24 * This file is available under and governed by the GNU General Public
25 * License version 2 only, as published by the Free Software Foundation.
26 * However, the following notice accompanied the original version of this
27 * file:
28 *
29 * Written by Doug Lea with assistance from members of JCP JSR-166
30 * Expert Group and released to the public domain, as explained at
31 * http://creativecommons.org/publicdomain/zero/1.0/
32 */
33
34 /*
35 * @test
36 * @bug 6805775 6815766
37 * @library /test/lib
38 * @run main OfferDrainToLoops 100
39 * @summary Test concurrent offer vs. drainTo
40 */
41
42 import java.util.ArrayList;
43 import java.util.List;
44 import java.util.SplittableRandom;
45 import java.util.concurrent.ArrayBlockingQueue;
46 import java.util.concurrent.BlockingQueue;
47 import java.util.concurrent.LinkedBlockingDeque;
48 import java.util.concurrent.LinkedBlockingQueue;
49 import java.util.concurrent.LinkedTransferQueue;
50 import java.util.concurrent.atomic.AtomicLong;
51 import jdk.test.lib.Utils;
52
53 @SuppressWarnings({"unchecked", "rawtypes", "deprecation"})
54 public class OfferDrainToLoops {
55 static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
56 final long testDurationMillisDefault = 10_000L;
57 final long testDurationMillis;
58
59 OfferDrainToLoops(String[] args) {
60 testDurationMillis = (args.length > 0) ?
61 Long.valueOf(args[0]) : testDurationMillisDefault;
62 }
63
64 void checkNotContainsNull(Iterable it) {
65 for (Object x : it)
66 check(x != null);
67 }
68
69 void test(String[] args) throws Throwable {
70 test(new LinkedBlockingQueue());
71 test(new LinkedBlockingQueue(2000));
72 test(new LinkedBlockingDeque());
73 test(new LinkedBlockingDeque(2000));
74 test(new ArrayBlockingQueue(2000));
75 test(new LinkedTransferQueue());
76 }
77
78 void test(final BlockingQueue q) throws Throwable {
79 System.out.println(q.getClass().getSimpleName());
80 final long testDurationNanos = testDurationMillis * 1000L * 1000L;
81 final long quittingTimeNanos = System.nanoTime() + testDurationNanos;
82 final SplittableRandom rnd = new SplittableRandom();
83
84 // Poor man's bounded buffer.
85 final AtomicLong approximateCount = new AtomicLong(0L);
86
87 abstract class CheckedThread extends Thread {
88 final SplittableRandom rnd;
89
90 CheckedThread(String name, SplittableRandom rnd) {
91 super(name);
92 this.rnd = rnd;
93 setDaemon(true);
94 start();
95 }
96 /** Polls for quitting time. */
97 protected boolean quittingTime() {
98 return System.nanoTime() - quittingTimeNanos > 0;
99 }
100 /** Polls occasionally for quitting time. */
101 protected boolean quittingTime(long i) {
102 return (i % 1024) == 0 && quittingTime();
103 }
104 protected abstract void realRun();
105 public void run() {
106 try { realRun(); } catch (Throwable t) { unexpected(t); }
107 }
108 }
109
110 Thread offerer = new CheckedThread("offerer", rnd.split()) {
111 protected void realRun() {
112 long c = 0;
113 for (long i = 0; ! quittingTime(i); i++) {
114 if (q.offer(c)) {
115 if ((++c % 1024) == 0) {
116 approximateCount.getAndAdd(1024);
117 while (approximateCount.get() > 10000)
118 Thread.yield();
119 }
120 } else {
121 Thread.yield();
122 }}}};
123
124 Thread drainer = new CheckedThread("drainer", rnd.split()) {
125 protected void realRun() {
126 while (! quittingTime()) {
127 List list = new ArrayList();
128 int n = rnd.nextBoolean() ?
129 q.drainTo(list) :
130 q.drainTo(list, 100);
131 approximateCount.getAndAdd(-n);
132 equal(list.size(), n);
133 for (int j = 0; j < n - 1; j++)
134 equal((Long) list.get(j) + 1L, list.get(j + 1));
135 Thread.yield();
136 }
137 q.clear();
138 approximateCount.set(0); // Releases waiting offerer thread
139 }};
140
141 Thread scanner = new CheckedThread("scanner", rnd.split()) {
142 protected void realRun() {
143 while (! quittingTime()) {
144 switch (rnd.nextInt(3)) {
145 case 0: checkNotContainsNull(q); break;
146 case 1: q.size(); break;
147 case 2:
148 Long[] a = (Long[]) q.toArray(new Long[0]);
149 int n = a.length;
150 for (int j = 0; j < n - 1; j++) {
151 check(a[j] < a[j+1]);
152 check(a[j] != null);
153 }
154 break;
155 }
156 Thread.yield();
157 }}};
158
159 for (Thread thread : new Thread[] { offerer, drainer, scanner }) {
160 thread.join(LONG_DELAY_MS + testDurationMillis);
161 if (thread.isAlive()) {
162 System.err.printf("Hung thread: %s%n", thread.getName());
163 failed++;
164 for (StackTraceElement e : thread.getStackTrace())
165 System.err.println(e);
166 thread.join(LONG_DELAY_MS);
167 }
168 }
169 }
170
171 //--------------------- Infrastructure ---------------------------
172 volatile int passed = 0, failed = 0;
173 void pass() {passed++;}
174 void fail() {failed++; Thread.dumpStack();}
175 void fail(String msg) {System.err.println(msg); fail();}
176 void unexpected(Throwable t) {failed++; t.printStackTrace();}
177 void check(boolean cond) {if (cond) pass(); else fail();}
178 void equal(Object x, Object y) {
179 if (x == null ? y == null : x.equals(y)) pass();
180 else fail(x + " not equal to " + y);}
181 public static void main(String[] args) throws Throwable {
182 new OfferDrainToLoops(args).instanceMain(args);}
183 public void instanceMain(String[] args) throws Throwable {
184 try {test(args);} catch (Throwable t) {unexpected(t);}
185 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
186 if (failed > 0) throw new AssertionError("Some tests failed");}
187 }