247
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1 /*
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2 * Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 6724218
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27 * @summary Fix raise_LCA_above_marks() early termination
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28 * @run main/othervm -Xbatch -XX:CompileCommand=exclude,Test.update Test
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29 */
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30
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31 public class Test {
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32 Test next = null;
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33 Object value = null;
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34
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35 static boolean _closed = false;
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36 static int size = 0;
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37 static Test list = null;
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38 static int cache_size = 0;
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39 static Test cache = null;
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40
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41 Object get(int i) {
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42 Test t = list;
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43 list = t.next;
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44 size -= 1;
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45 Object o = t.value;
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46 if (i > 0) {
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47 t.next = cache;
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48 t.value = null;
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49 cache = t;
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50 cache_size = +1;
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51 }
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52 return o;
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53 }
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54
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55 void update() {
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56 // Exclude compilation of this one.
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57 if (size == 0) {
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58 Test t;
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59 if (cache_size > 0) {
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60 t = cache;
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61 cache = t.next;
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62 cache_size = -1;
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63 } else {
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64 t = new Test();
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65 }
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66 t.value = new Object();
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67 t.next = list;
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68 list = t;
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69 size += 1;
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70 }
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71 }
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72
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73 synchronized Object test(int i) {
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74 while (true) {
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75 if (_closed) {
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76 return null;
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77 } else if (size > 0) {
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78 return get(i);
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79 }
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80 update();
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81 }
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82 }
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83
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84 public static void main(String argv[]) throws Exception {
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85 Test t = new Test();
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86 int lim = 500000;
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87 Object o;
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88 for (int j = 0; j < lim; j++) {
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89 o = t.test(j&1);
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90 if (o == null) {
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91 throw new Exception("*** Failed on iteration " + j);
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92 }
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93 if ((j&1) == 0) {
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94 t.update();
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95 }
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96 }
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97 }
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98 }
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