1 /*
   2  * Copyright (c) 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 /*
  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 }