87 lines
2.7 KiB
Java
87 lines
2.7 KiB
Java
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/*
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* Copyright (c) 2001, 2012, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package sun.nio.ch;
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import sun.misc.*;
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/**
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* Manipulates a native array of pollfd structs.
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*
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* @author Mike McCloskey
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* @since 1.4
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*/
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public abstract class AbstractPollArrayWrapper {
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// Miscellaneous constants
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static final short SIZE_POLLFD = 8;
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static final short FD_OFFSET = 0;
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static final short EVENT_OFFSET = 4;
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static final short REVENT_OFFSET = 6;
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// The poll fd array
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protected AllocatedNativeObject pollArray;
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// Number of valid entries in the pollArray
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protected int totalChannels = 0;
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// Base address of the native pollArray
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protected long pollArrayAddress;
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// Access methods for fd structures
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int getEventOps(int i) {
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int offset = SIZE_POLLFD * i + EVENT_OFFSET;
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return pollArray.getShort(offset);
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}
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int getReventOps(int i) {
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int offset = SIZE_POLLFD * i + REVENT_OFFSET;
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return pollArray.getShort(offset);
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}
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int getDescriptor(int i) {
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int offset = SIZE_POLLFD * i + FD_OFFSET;
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return pollArray.getInt(offset);
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}
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void putEventOps(int i, int event) {
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int offset = SIZE_POLLFD * i + EVENT_OFFSET;
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pollArray.putShort(offset, (short)event);
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}
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void putReventOps(int i, int revent) {
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int offset = SIZE_POLLFD * i + REVENT_OFFSET;
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pollArray.putShort(offset, (short)revent);
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}
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void putDescriptor(int i, int fd) {
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int offset = SIZE_POLLFD * i + FD_OFFSET;
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pollArray.putInt(offset, fd);
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}
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}
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