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/*
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* Copyright (c) 2001, 2002, 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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/*
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*/
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package sun.nio.ch;
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/**
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* Manipulates a native array of structs corresponding to (fd, events) pairs.
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*
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* typedef struct pollfd {
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* SOCKET fd; // 4 bytes
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* short events; // 2 bytes
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* } pollfd_t;
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*
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* @author Konstantin Kladko
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* @author Mike McCloskey
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*/
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class PollArrayWrapper {
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private AllocatedNativeObject pollArray; // The fd array
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long pollArrayAddress; // pollArrayAddress
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private static final short FD_OFFSET = 0; // fd offset in pollfd
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private static final short EVENT_OFFSET = 4; // events offset in pollfd
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static short SIZE_POLLFD = 8; // sizeof pollfd struct
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// events masks
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static final short POLLIN = AbstractPollArrayWrapper.POLLIN;
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static final short POLLOUT = AbstractPollArrayWrapper.POLLOUT;
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static final short POLLERR = AbstractPollArrayWrapper.POLLERR;
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static final short POLLHUP = AbstractPollArrayWrapper.POLLHUP;
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static final short POLLNVAL = AbstractPollArrayWrapper.POLLNVAL;
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static final short POLLREMOVE = AbstractPollArrayWrapper.POLLREMOVE;
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static final short POLLCONN = 0x0002;
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private int size; // Size of the pollArray
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PollArrayWrapper(int newSize) {
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int allocationSize = newSize * SIZE_POLLFD;
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pollArray = new AllocatedNativeObject(allocationSize, true);
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pollArrayAddress = pollArray.address();
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this.size = newSize;
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}
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// Prepare another pollfd struct for use.
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void addEntry(int index, SelectionKeyImpl ski) {
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putDescriptor(index, ski.channel.getFDVal());
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}
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// Writes the pollfd entry from the source wrapper at the source index
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// over the entry in the target wrapper at the target index.
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void replaceEntry(PollArrayWrapper source, int sindex,
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PollArrayWrapper target, int tindex) {
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target.putDescriptor(tindex, source.getDescriptor(sindex));
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target.putEventOps(tindex, source.getEventOps(sindex));
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}
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// Grows the pollfd array to new size
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void grow(int newSize) {
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PollArrayWrapper temp = new PollArrayWrapper(newSize);
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for (int i = 0; i < size; i++)
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replaceEntry(this, i, temp, i);
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pollArray.free();
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pollArray = temp.pollArray;
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this.size = temp.size;
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pollArrayAddress = pollArray.address();
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}
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void free() {
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pollArray.free();
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}
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// Access methods for fd structures
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void putDescriptor(int i, int fd) {
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pollArray.putInt(SIZE_POLLFD * i + FD_OFFSET, fd);
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}
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void putEventOps(int i, int event) {
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pollArray.putShort(SIZE_POLLFD * i + EVENT_OFFSET, (short)event);
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}
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int getEventOps(int i) {
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return pollArray.getShort(SIZE_POLLFD * i + EVENT_OFFSET);
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}
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int getDescriptor(int i) {
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return pollArray.getInt(SIZE_POLLFD * i + FD_OFFSET);
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}
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// Adds Windows wakeup socket at a given index.
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void addWakeupSocket(int fdVal, int index) {
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putDescriptor(index, fdVal);
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putEventOps(index, POLLIN);
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}
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}
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