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test/hotspot/jtreg/vmTestbase/gc/gctests/WeakReference/weak001/weak001.java

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rev 59094 : imported patch randomness-keyword_vmTestbase_gc
rev 59095 : imported patch 8243430.00
   1 /*
   2  * Copyright (c) 2004, 2018, 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  * @key stress gc
  27  *
  28  * @summary converted from VM Testbase gc/gctests/WeakReference/weak001.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  30  * VM Testbase readme:
  31  * DESCRIPTION
  32  *     The test checks that Garbage Collector correctly works with
  33  *     WeakReferences. It also checks that no unexpected exceptions and errors
  34  *     are thrown or the JVM is not crashed.
  35  *     The test starts a number of threads. Each thread run tests for some time
  36  *     or serveral iterations.  See javadoc StressOptions for configuration.
  37  *     First of all each test defines what type to check (there are 10 types
  38  *     totally). As soon as the type is defined, a WeakReference is created that
  39  *     refers to an array of tested type and is registered with in a queue. A
  40  *     WeakReference for NonbranchyTree class does not refer to an array, but to
  41  *     instances of the class.
  42  *     After that a thread performs next checks for the reference:
  43  *         1. The reference is in queue after GC is provoked with
  44  *            Algorithms.eatMemory() method (a single thread eats the memory).
  45  *         2. queue.remove() returns reference from the queue.
  46  *         3. queue.poll() returns null.


   1 /*
   2  * Copyright (c) 2004, 2020, 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  * @key stress gc randomness
  27  *
  28  * @summary converted from VM Testbase gc/gctests/WeakReference/weak001.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  30  * VM Testbase readme:
  31  * DESCRIPTION
  32  *     The test checks that Garbage Collector correctly works with
  33  *     WeakReferences. It also checks that no unexpected exceptions and errors
  34  *     are thrown or the JVM is not crashed.
  35  *     The test starts a number of threads. Each thread run tests for some time
  36  *     or serveral iterations.  See javadoc StressOptions for configuration.
  37  *     First of all each test defines what type to check (there are 10 types
  38  *     totally). As soon as the type is defined, a WeakReference is created that
  39  *     refers to an array of tested type and is registered with in a queue. A
  40  *     WeakReference for NonbranchyTree class does not refer to an array, but to
  41  *     instances of the class.
  42  *     After that a thread performs next checks for the reference:
  43  *         1. The reference is in queue after GC is provoked with
  44  *            Algorithms.eatMemory() method (a single thread eats the memory).
  45  *         2. queue.remove() returns reference from the queue.
  46  *         3. queue.poll() returns null.


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