| /* |
| * Copyright (c) 2011, 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. |
| */ |
| |
| /* |
| * KQueueArrayWrapper.java |
| * Implementation of Selector using FreeBSD / Mac OS X kqueues |
| * Derived from Sun's DevPollArrayWrapper |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import sun.security.action.GetPropertyAction; |
| |
| /* |
| * struct kevent { // 32-bit 64-bit |
| * uintptr_t ident; // 4 8 |
| * short filter; // 2 2 |
| * u_short flags; // 2 2 |
| * u_int fflags; // 4 4 |
| * intptr_t data; // 4 8 |
| * void *udata; // 4 8 |
| * } // Total: 20 32 |
| * |
| * The implementation works in 32-bit and 64-bit world. We do this by calling a |
| * native function that actually sets the sizes and offsets of the fields based |
| * on which mode we're in. |
| */ |
| |
| class KQueueArrayWrapper { |
| // kevent filters |
| static short EVFILT_READ; |
| static short EVFILT_WRITE; |
| |
| // kevent struct |
| // These fields are now set by initStructSizes in the static initializer. |
| static short SIZEOF_KEVENT; |
| static short FD_OFFSET; |
| static short FILTER_OFFSET; |
| |
| // kevent array size |
| static final int NUM_KEVENTS = 128; |
| |
| // Are we in a 64-bit VM? |
| static boolean is64bit = false; |
| |
| // The kevent array (used for outcoming events only) |
| private AllocatedNativeObject keventArray = null; |
| private long keventArrayAddress; |
| |
| // The kqueue fd |
| private int kq = -1; |
| |
| // The fd of the interrupt line going out |
| private int outgoingInterruptFD; |
| |
| // The fd of the interrupt line coming in |
| private int incomingInterruptFD; |
| |
| static { |
| IOUtil.load(); |
| initStructSizes(); |
| String datamodel = GetPropertyAction.getProperty("sun.arch.data.model"); |
| is64bit = "64".equals(datamodel); |
| } |
| |
| KQueueArrayWrapper() { |
| int allocationSize = SIZEOF_KEVENT * NUM_KEVENTS; |
| keventArray = new AllocatedNativeObject(allocationSize, true); |
| keventArrayAddress = keventArray.address(); |
| kq = init(); |
| } |
| |
| // Used to update file description registrations |
| private static class Update { |
| SelChImpl channel; |
| int events; |
| Update(SelChImpl channel, int events) { |
| this.channel = channel; |
| this.events = events; |
| } |
| } |
| |
| private LinkedList<Update> updateList = new LinkedList<Update>(); |
| |
| void initInterrupt(int fd0, int fd1) { |
| outgoingInterruptFD = fd1; |
| incomingInterruptFD = fd0; |
| register0(kq, fd0, 1, 0); |
| } |
| |
| int getReventOps(int index) { |
| int result = 0; |
| int offset = SIZEOF_KEVENT*index + FILTER_OFFSET; |
| short filter = keventArray.getShort(offset); |
| |
| // This is all that's necessary based on inspection of usage: |
| // SinkChannelImpl, SourceChannelImpl, DatagramChannelImpl, |
| // ServerSocketChannelImpl, SocketChannelImpl |
| if (filter == EVFILT_READ) { |
| result |= Net.POLLIN; |
| } else if (filter == EVFILT_WRITE) { |
| result |= Net.POLLOUT; |
| } |
| |
| return result; |
| } |
| |
| int getDescriptor(int index) { |
| int offset = SIZEOF_KEVENT*index + FD_OFFSET; |
| /* The ident field is 8 bytes in 64-bit world, however the API wants us |
| * to return an int. Hence read the 8 bytes but return as an int. |
| */ |
| if (is64bit) { |
| long fd = keventArray.getLong(offset); |
| assert fd <= Integer.MAX_VALUE; |
| return (int) fd; |
| } else { |
| return keventArray.getInt(offset); |
| } |
| } |
| |
| void setInterest(SelChImpl channel, int events) { |
| synchronized (updateList) { |
| // update existing registration |
| updateList.add(new Update(channel, events)); |
| } |
| } |
| |
| void release(SelChImpl channel) { |
| synchronized (updateList) { |
| // flush any pending updates |
| for (Iterator<Update> it = updateList.iterator(); it.hasNext();) { |
| if (it.next().channel == channel) { |
| it.remove(); |
| } |
| } |
| |
| // remove |
| register0(kq, channel.getFDVal(), 0, 0); |
| } |
| } |
| |
| void updateRegistrations() { |
| synchronized (updateList) { |
| Update u = null; |
| while ((u = updateList.poll()) != null) { |
| SelChImpl ch = u.channel; |
| if (!ch.isOpen()) |
| continue; |
| |
| register0(kq, ch.getFDVal(), u.events & Net.POLLIN, u.events & Net.POLLOUT); |
| } |
| } |
| } |
| |
| |
| void close() throws IOException { |
| if (keventArray != null) { |
| keventArray.free(); |
| keventArray = null; |
| } |
| if (kq >= 0) { |
| FileDispatcherImpl.closeIntFD(kq); |
| kq = -1; |
| } |
| } |
| |
| int poll(long timeout) { |
| updateRegistrations(); |
| int updated = kevent0(kq, keventArrayAddress, NUM_KEVENTS, timeout); |
| return updated; |
| } |
| |
| void interrupt() { |
| interrupt(outgoingInterruptFD); |
| } |
| |
| private native int init(); |
| private static native void initStructSizes(); |
| |
| private native void register0(int kq, int fd, int read, int write); |
| private native int kevent0(int kq, long keventAddress, int keventCount, |
| long timeout); |
| private static native void interrupt(int fd); |
| } |