/* * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions.
*/
/* @test * @summary Test failure paths for MAP_SYNC FileChannel.map of non-DAX files * @modules java.base/jdk.internal.misc * @run main MapSyncFail true * @run main MapSyncFail false
*/
publicstaticvoid main(String[] args) throws Exception { if (args.length != 1) { thrownew Exception("Expected true or false as argument");
} boolean is_rw = Boolean.valueOf(args[0]);
FileChannel.MapMode mode = (is_rw ? ExtendedMapMode.READ_WRITE_SYNC : ExtendedMapMode.READ_ONLY_SYNC); // it is assumed that /tmp is not a DAX file system
File file = File.createTempFile("MapSyncFail", null);
file.deleteOnExit(); long filesize = (8 * K); try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.setLength(filesize);
FileChannel fc = raf.getChannel();
MappedByteBuffer mbb = fc.map(mode, 0, filesize);
} catch(IOException ioe) { // when writeback is enabled for the current os/cpu // combination the underlying mmap should be attempted and // the map call should fail with IOException if (!Unsafe.isWritebackEnabled()) { thrownew Exception("IOException not expected");
}
System.out.println("caught " + ioe);
ioe.printStackTrace(); return;
} catch (UnsupportedOperationException uoe) { // when writeback is not enabled for the current os/cpu // combination the mmap should not be attempted and the // map call should fail with UnsupportedOperationException
if (Unsafe.isWritebackEnabled()) { thrownew Exception("UnsupportedOperationException not expected");
}
System.out.println("caught " + uoe);
uoe.printStackTrace(); return;
}
thrownew Exception("expected IOException or UnsupportedOperationException");
}
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.