/* * Copyright (c) 2011, 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. */ /* * KQueueArrayWrapper.java * Implementation of Selector using FreeBSD / Mac OS X kqueues * Derived from Sun's DevPollArrayWrapper */ package sun.nio.ch; import sun.misc.*; import java.io.IOException; import java.io.FileDescriptor; /* * 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 { // Event masks static final short POLLIN = AbstractPollArrayWrapper.POLLIN; static final short POLLOUT = AbstractPollArrayWrapper.POLLOUT; // 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 (just under 1K bytes) static final int NUM_KEVENTS = 50; // 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 { initStructSizes(); String datamodel = (String) java.security.AccessController.doPrivileged( new sun.security.action.GetPropertyAction("sun.arch.data.model")); is64bit = datamodel.equals("64"); } KQueueArrayWrapper() { int allocationSize = SIZEOF_KEVENT * NUM_KEVENTS; keventArray = new AllocatedNativeObject(allocationSize, true); keventArrayAddress = keventArray.address(); kq = init(); } 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 |= POLLIN; } else if (filter == EVFILT_WRITE) { result |= 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(int fd, int events) { register0(kq, fd, events & POLLIN, events & POLLOUT); } void release(int fd) { register0(kq, fd, 0, 0); } void close() throws IOException { if (keventArray != null) { keventArray.free(); keventArray = null; } if (kq >= 0) { FileDispatcherImpl.closeIntFD(kq); kq = -1; } } int poll(long timeout) { 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); }