1 /*

     2  * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 6724218

    27  * @summary Fix raise_LCA_above_marks() early termination

    28  * @run main/othervm -Xbatch -XX:CompileCommand=exclude,Test.update Test

    29  */

    30 

    31 public class Test {

    32     Test   next  = null;

    33     Object value = null;

    34 

    35     static boolean _closed = false;

    36     static int size = 0;

    37     static Test list  = null;

    38     static int cache_size = 0;

    39     static Test cache = null;

    40 

    41     Object get(int i) {

    42         Test t = list;

    43         list = t.next;

    44         size -= 1;

    45         Object o = t.value;

    46         if (i > 0) {

    47             t.next = cache;

    48             t.value = null;

    49             cache = t;

    50             cache_size = +1;

    51         }

    52         return o;

    53     }

    54 

    55     void update() {

    56         // Exclude compilation of this one.

    57         if (size == 0) {

    58             Test t;

    59             if (cache_size > 0) {

    60                 t = cache;

    61                 cache = t.next;

    62                 cache_size = -1;

    63             } else {

    64                 t = new Test();

    65             }

    66             t.value = new Object();

    67             t.next = list;

    68             list = t;

    69             size += 1;

    70         }

    71     }

    72 

    73     synchronized Object test(int i) {

    74         while (true) {

    75             if (_closed) {

    76                 return null;

    77             } else if (size > 0) {

    78                 return get(i);

    79             }

    80             update();

    81         }

    82     }

    83 

    84     public static void main(String argv[]) throws Exception {

    85         Test t = new Test();

    86         int lim = 500000;

    87         Object o;

    88         for (int j = 0; j < lim; j++) {

    89             o = t.test(j&1);

    90             if (o == null) {

    91               throw new Exception("*** Failed on iteration " + j);

    92             }

    93             if ((j&1) == 0) {

    94               t.update();

    95             }

    96         }

    97     }

    98 }