IoUringBufferRing.java — netty Source File

Source Code

/*
 * Copyright 2025 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.uring;

import io.netty.buffer.ByteBuf;
import io.netty.channel.unix.Buffer;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.function.Consumer;

final class IoUringBufferRing {
    private static final VarHandle SHORT_HANDLE =
            MethodHandles.byteBufferViewVarHandle(short[].class, ByteOrder.nativeOrder());
    private final ByteBuffer ioUringBufRing;
    private final int tailFieldPosition;
    private final short entries;
    private final short mask;
    private final short bufferGroupId;
    private final int ringFd;
    private final ByteBuf[] buffers;
    private final IoUringBufferRingAllocator allocator;
    private final boolean batchAllocation;
    private final IoUringBufferRingExhaustedEvent exhaustedEvent;
    private final RingConsumer ringConsumer;
    private final boolean incremental;
    private final int batchSize;
    private boolean corrupted;
    private boolean closed;
    private int usableBuffers;
    private int allocatedBuffers;
    private boolean needExpand;
    private short lastGeneratedBid;

    IoUringBufferRing(int ringFd, ByteBuffer ioUringBufRing,
                      short entries, int batchSize, short bufferGroupId, boolean incremental,
                      IoUringBufferRingAllocator allocator, boolean batchAllocation) {
        assert entries % 2 == 0;
        assert batchSize % 2 == 0;
        this.batchSize = batchSize;
        this.ioUringBufRing = ioUringBufRing;
        this.tailFieldPosition = Native.IO_URING_BUFFER_RING_TAIL;
        this.entries = entries;
        this.mask = (short) (entries - 1);
// ... (237 more lines)