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121 lines
3.8 KiB
Java
121 lines
3.8 KiB
Java
/*
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* Copyright (c) 2012, 2018, 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 java.io.IOException;
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import jdk.internal.misc.Unsafe;
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/**
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* Provides access to the BSD kqueue facility.
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*/
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class KQueue {
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private KQueue() { }
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private static final Unsafe unsafe = Unsafe.getUnsafe();
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/**
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* struct kevent {
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* uintptr_t ident; // identifier for this event, usually the fd
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* int16_t filter; // filter for event
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* uint16_t flags; // general flags
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* uint32_t fflags; // filter-specific flags
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* intptr_t data; // filter-specific data
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* void *udata; // opaque user data identifier
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* };
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*/
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private static final int SIZEOF_KQUEUEEVENT = keventSize();
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private static final int OFFSET_IDENT = identOffset();
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private static final int OFFSET_FILTER = filterOffset();
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private static final int OFFSET_FLAGS = flagsOffset();
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// filters
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static final int EVFILT_READ = -1;
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static final int EVFILT_WRITE = -2;
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// flags
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static final int EV_ADD = 0x0001;
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static final int EV_DELETE = 0x0002;
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static final int EV_ONESHOT = 0x0010;
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static final int EV_CLEAR = 0x0020;
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/**
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* Allocates a poll array to handle up to {@code count} events.
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*/
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static long allocatePollArray(int count) {
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return unsafe.allocateMemory(count * SIZEOF_KQUEUEEVENT);
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}
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/**
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* Free a poll array
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*/
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static void freePollArray(long address) {
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unsafe.freeMemory(address);
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}
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/**
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* Returns kevent[i].
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*/
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static long getEvent(long address, int i) {
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return address + (SIZEOF_KQUEUEEVENT*i);
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}
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/**
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* Returns the file descriptor from a kevent (assuming to be in ident field)
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*/
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static int getDescriptor(long address) {
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return unsafe.getInt(address + OFFSET_IDENT);
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}
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static int getFilter(long address) {
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return unsafe.getShort(address + OFFSET_FILTER);
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}
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static int getFlags(long address) {
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return unsafe.getShort(address + OFFSET_FLAGS);
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}
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// -- Native methods --
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private static native int keventSize();
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private static native int identOffset();
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private static native int filterOffset();
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private static native int flagsOffset();
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static native int kqueue() throws IOException;
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static native int keventRegister(int kqpfd, int fd, int filter, int flags);
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static native int keventPoll(int kqpfd, long pollAddress, int nevents)
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throws IOException;
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static {
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IOUtil.load();
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}
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}
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