73 lines
2.8 KiB
Java
73 lines
2.8 KiB
Java
/*
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* Copyright (c) 2015, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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// Note: we run the test with MallocLimit for the "other" category set to 100m (oom mode),
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// in order to trigger and observe a fake os::malloc oom. This needs NMT.
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/*
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* @test
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* @requires vm.compMode != "Xcomp"
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* @bug 8058897
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:NativeMemoryTracking=summary -XX:MallocLimit=other:100m:oom Reallocate
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*/
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import jdk.internal.misc.Unsafe;
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import static jdk.test.lib.Asserts.*;
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public class Reallocate {
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public static void main(String args[]) throws Exception {
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Unsafe unsafe = Unsafe.getUnsafe();
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long address = unsafe.allocateMemory(1);
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assertNotEquals(address, 0L);
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// Make sure we reallocate correctly
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unsafe.putByte(address, Byte.MAX_VALUE);
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address = unsafe.reallocateMemory(address, 2);
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assertNotEquals(address, 0L);
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assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);
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// Reallocating with a 0 size should return a null pointer
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address = unsafe.reallocateMemory(address, 0);
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assertEquals(address, 0L);
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// Reallocating with a null pointer should result in a normal allocation
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address = unsafe.reallocateMemory(0L, 1);
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assertNotEquals(address, 0L);
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unsafe.putByte(address, Byte.MAX_VALUE);
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assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);
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// Make sure we can throw an OOME when we fail to reallocate due to OOM
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try {
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unsafe.reallocateMemory(address, 100 * 1024 * 1024);
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} catch (OutOfMemoryError e) {
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// Expected
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return;
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}
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throw new RuntimeException("Did not get expected OOM");
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}
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}
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