KQueueIoHandler.java — netty Source File

Source Code

/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.kqueue;

import io.netty.channel.Channel;
import io.netty.channel.DefaultSelectStrategyFactory;
import io.netty.channel.IoHandle;
import io.netty.channel.IoHandler;
import io.netty.channel.IoHandlerContext;
import io.netty.channel.IoHandlerFactory;
import io.netty.channel.IoOps;
import io.netty.channel.IoRegistration;
import io.netty.channel.SelectStrategy;
import io.netty.channel.SelectStrategyFactory;
import io.netty.channel.unix.FileDescriptor;
import io.netty.util.IntSupplier;
import io.netty.util.collection.LongObjectHashMap;
import io.netty.util.collection.LongObjectMap;
import io.netty.util.concurrent.ThreadAwareExecutor;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.StringUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.io.IOException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

import static java.lang.Math.min;

/**
 * {@link IoHandler} which uses kqueue under the covers. Only works on BSD!
 */
public final class KQueueIoHandler implements IoHandler {
    private static final InternalLogger logger = InternalLoggerFactory.getInstance(KQueueIoHandler.class);
    private static final AtomicIntegerFieldUpdater<KQueueIoHandler> WAKEN_UP_UPDATER =
            AtomicIntegerFieldUpdater.newUpdater(KQueueIoHandler.class, "wakenUp");
    private static final int KQUEUE_WAKE_UP_IDENT = 0;
    // `kqueue()` may return EINVAL when a large number such as Integer.MAX_VALUE is specified as timeout.
    // 24 hours would be a large enough value.
    // https://man.freebsd.org/cgi/man.cgi?query=kevent&apropos=0&sektion=0&manpath=FreeBSD+6.1-RELEASE&format=html#end
    private static final int KQUEUE_MAX_TIMEOUT_SECONDS = 86399; // 24 hours - 1 second
// ... (459 more lines)