TestDescription.java

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/*
 * @test
 * @key stress randomness
 *
 * @summary converted from VM Testbase gc/gctests/WeakReference/weak002.
 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
 * VM Testbase readme:
 * DESCRIPTION
 *     The test checks that Garbage Collector correctly works with
 *     WeakReferences. It also checks that no unexpected exceptions and errors
 *     are thrown or the JVM is not crashed.
 *     The test starts a number of threads. Each thread run tests for some time
 *     or serveral iterations.  See javadoc StressOptions for configuration.
 *     First of all each test defines what type to check (there are 10 types
 *     totally). As soon as the type is defined, a WeakReference is created that
 *     refers to an array of tested type and is registered with in a queue. A
 *     WeakReference for NonbranchyTree class does not refer to an array, but to
 *     instances of the class.
 *     After that a thread performs next checks for the reference:
 *         1. The reference is in queue after GC is provoked with
 *            Algorithms.eatMemory() method (a single thread eats the memory).
 *         2. queue.remove() returns reference from the queue.
 *         3. queue.poll() returns null.
 *         4. reference.clear() does not throw any exception.
 *     The test extends ThreadedGCTest and implements GarbageProducerAware and
 *     MemoryStrategyAware interfaces. The corresponding javadoc documentation
 *     for additional test configuration.
 *
 * @library /vmTestbase
 *          /test/lib
 * @run main/othervm gc.gctests.WeakReference.weak001.weak001 -ms high
 */