83 lines
3.0 KiB
Java
83 lines
3.0 KiB
Java
/*
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* Copyright (c) 2001, 2025, 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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/**
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* @test
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* @bug 4490253 6535542 8357959
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* @key randomness
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* @library /test/lib
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* @build jdk.test.lib.RandomFactory
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* @summary Verify that newly allocated direct buffers are initialized.
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* @run main/othervm AllocateDirectInit
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*/
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import java.nio.ByteBuffer;
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import java.util.Random;
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import jdk.test.lib.RandomFactory;
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public class AllocateDirectInit {
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private static final int MAX_BIN_LIMIT = 16 * 1024 * 1024;
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private static final int MAX_DEC_LIMIT = 10 * 1000 * 1000;
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private static final int TRIES_PER_LIMIT = 1024;
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private static final Random RND = RandomFactory.getRandom();
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public static void main(String [] args){
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// Try power of two limits
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for (int limit = 1; limit < MAX_BIN_LIMIT; limit *= 2) {
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check(ByteBuffer.allocateDirect(limit - 1));
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check(ByteBuffer.allocateDirect(limit));
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check(ByteBuffer.allocateDirect(limit + 1));
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}
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// Try power of ten limits
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for (int limit = 1; limit < MAX_DEC_LIMIT; limit *= 10) {
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check(ByteBuffer.allocateDirect(limit - 1));
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check(ByteBuffer.allocateDirect(limit));
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check(ByteBuffer.allocateDirect(limit + 1));
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}
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// Try random sizes within power of two limits
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for (int limit = 1; limit < MAX_BIN_LIMIT; limit *= 2) {
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for (int t = 0; t < TRIES_PER_LIMIT; t++) {
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check(ByteBuffer.allocateDirect(RND.nextInt(limit)));
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}
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}
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}
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private static void check(ByteBuffer bb) {
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while (bb.hasRemaining()) {
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if (bb.get() != 0) {
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int mismatchPos = bb.position();
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System.out.print("byte [");
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for (bb.position(0); bb.position() < bb.limit(); ) {
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System.out.print(" " + Integer.toHexString(bb.get() & 0xff));
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}
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System.out.println(" ]");
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throw new RuntimeException("uninitialized buffer, position = " + mismatchPos);
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}
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}
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}
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}
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