| /* |
| * Copyright (c) 2001, 2013, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| /* |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.lang.annotation.Native; |
| |
| /** |
| * Manipulates a native array of structs corresponding to (fd, events) pairs. |
| * |
| * typedef struct pollfd { |
| * SOCKET fd; // 4 bytes |
| * short events; // 2 bytes |
| * } pollfd_t; |
| * |
| * @author Konstantin Kladko |
| * @author Mike McCloskey |
| */ |
| |
| class PollArrayWrapper { |
| |
| private AllocatedNativeObject pollArray; // The fd array |
| |
| long pollArrayAddress; // pollArrayAddress |
| |
| @Native private static final short FD_OFFSET = 0; // fd offset in pollfd |
| @Native private static final short EVENT_OFFSET = 4; // events offset in pollfd |
| |
| static short SIZE_POLLFD = 8; // sizeof pollfd struct |
| |
| private int size; // Size of the pollArray |
| |
| PollArrayWrapper(int newSize) { |
| int allocationSize = newSize * SIZE_POLLFD; |
| pollArray = new AllocatedNativeObject(allocationSize, true); |
| pollArrayAddress = pollArray.address(); |
| this.size = newSize; |
| } |
| |
| // Prepare another pollfd struct for use. |
| void addEntry(int index, SelectionKeyImpl ski) { |
| putDescriptor(index, ski.channel.getFDVal()); |
| } |
| |
| // Writes the pollfd entry from the source wrapper at the source index |
| // over the entry in the target wrapper at the target index. |
| void replaceEntry(PollArrayWrapper source, int sindex, |
| PollArrayWrapper target, int tindex) { |
| target.putDescriptor(tindex, source.getDescriptor(sindex)); |
| target.putEventOps(tindex, source.getEventOps(sindex)); |
| } |
| |
| // Grows the pollfd array to new size |
| void grow(int newSize) { |
| PollArrayWrapper temp = new PollArrayWrapper(newSize); |
| for (int i = 0; i < size; i++) |
| replaceEntry(this, i, temp, i); |
| pollArray.free(); |
| pollArray = temp.pollArray; |
| this.size = temp.size; |
| pollArrayAddress = pollArray.address(); |
| } |
| |
| void free() { |
| pollArray.free(); |
| } |
| |
| // Access methods for fd structures |
| void putDescriptor(int i, int fd) { |
| pollArray.putInt(SIZE_POLLFD * i + FD_OFFSET, fd); |
| } |
| |
| void putEventOps(int i, int event) { |
| pollArray.putShort(SIZE_POLLFD * i + EVENT_OFFSET, (short)event); |
| } |
| |
| int getEventOps(int i) { |
| return pollArray.getShort(SIZE_POLLFD * i + EVENT_OFFSET); |
| } |
| |
| int getDescriptor(int i) { |
| return pollArray.getInt(SIZE_POLLFD * i + FD_OFFSET); |
| } |
| |
| // Adds Windows wakeup socket at a given index. |
| void addWakeupSocket(int fdVal, int index) { |
| putDescriptor(index, fdVal); |
| putEventOps(index, Net.POLLIN); |
| } |
| } |