{"id":119737,"date":"2026-10-30T08:19:09","date_gmt":"2026-10-30T00:19:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/119737.html"},"modified":"2026-10-30T08:19:09","modified_gmt":"2026-10-30T00:19:09","slug":"io_uring-%e7%9a%84%e5%bc%82%e6%ad%a5%e4%ba%8b%e4%bb%b6%e8%bd%ae%e8%af%a2%ef%bc%88ioring_op_poll_add%ef%bc%89%ef%bc%9a%e6%9e%84%e5%bb%ba%e7%99%be%e4%b8%87%e5%b9%b6%e5%8f%91%e9%95%bf%e8%bf%9e%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/119737.html","title":{"rendered":"io_uring \u7684\u5f02\u6b65\u4e8b\u4ef6\u8f6e\u8be2\uff08IORING_OP_POLL_ADD\uff09\uff1a\u6784\u5efa\u767e\u4e07\u5e76\u53d1\u957f\u8fde\u63a5\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668\u7684\u5e95\u5c42\u89e3\u5bc6"},"content":{"rendered":"

\"\u5c01\u9762\u4fe1\u606f\u56fe\"<\/p>\n

\u5728\u5373\u65f6\u901a\u8baf（IM）\u3001\u957f\u8fde\u63a5\u7f51\u5173\u3001\u7269\u8054\u7f51（IoT）\u4f20\u611f\u5668\u6c47\u805a\u8282\u70b9\u7b49\u6d77\u91cf\u5e76\u53d1\u63a5\u5165\u573a\u666f\u4e0b，\u5355\u53f0\u7269\u7406\u673a\u901a\u5e38\u9700\u8981\u540c\u65f6\u7ef4\u6301\u6570\u5341\u4e07\u4e43\u81f3\u6570\u767e\u4e07\u6761\u5904\u4e8e\u95f2\u7f6e\u72b6\u6001（Idle）\u7684 TCP \u957f\u8fde\u63a5\u3002\u5728\u8fc7\u53bb\u7684\u67b6\u6784\u4f53\u7cfb\u4e2d，\u552f\u4e00\u7684\u6807\u51c6\u89e3\u6cd5\u662f\u57fa\u4e8e epoll \u7684\u4e8b\u4ef6\u591a\u8def\u590d\u7528\u3002\u7136\u800c，\u968f\u7740\u5e76\u53d1\u8fde\u63a5\u6570\u7a81\u7834 100 \u4e07\u5927\u5173，epoll \u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u4e0e\u63a7\u5236\u6d41\u8bbe\u8ba1\u9010\u6e10\u663e\u9732\u51fa\u5176\u56fa\u6709\u7684\u6027\u80fd\u5929\u82b1\u677f：\u57fa\u4e8e\u7ea2\u9ed1\u6811\u7684\u4e8b\u4ef6\u76d1\u542c\u8868\u5728\u9ad8\u9891\u589e\u5220\u65f6\u4f34\u968f\u7740\u5168\u5c40\u4e92\u65a5\u9501\u7ade\u4e89，\u9891\u7e41\u7684 epoll_ctl \u7cfb\u7edf\u8c03\u7528\u5728\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u4e4b\u95f4\u6495\u626f，\u5bfc\u81f4\u7cfb\u7edf\u65e0\u6cd5\u81ea\u62d4\u5730\u9677\u5165\u7279\u6743\u7ea7\u5207\u6362\u5f00\u9500\u4e2d\u3002<\/p>\n

io_uring \u63d0\u4f9b\u7684\u5f02\u6b65\u4e8b\u4ef6\u8f6e\u8be2\u64cd\u4f5c\u7b26\u2014\u2014IORING_OP_POLL_ADD（\u4ee5\u53ca\u73b0\u4ee3\u5185\u6838\u652f\u6301\u7684 IORING_POLL_ADD_MULTI），\u63d0\u4f9b\u4e86\u4e00\u79cd\u5f7b\u5e95\u89e3\u8026\u4e14\u6027\u80fd\u66f4\u5f3a\u52b2\u7684\u66ff\u4ee3\u67b6\u6784\u3002\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u50cf\u63d0\u4ea4\u666e\u901a\u5f02\u6b65\u8bfb\u5199\u8bf7\u6c42\u4e00\u6837，\u5411\u73af\u5f62\u65e0\u9501\u63d0\u4ea4\u961f\u5217（SQ）\u6295\u9012\u7f51\u7edc\u5957\u63a5\u5b57\u7684\u4e8b\u4ef6\u76d1\u542c\u610f\u56fe，\u5185\u6838\u5168\u6743\u63a5\u7ba1\u7b49\u5f85\u961f\u5217\u9a71\u52a8，\u5e76\u5728\u4e8b\u4ef6\u5c31\u7eea\u65f6\u5c06\u7ed3\u679c\u7edf\u4e00\u8f93\u51fa\u81f3\u5b8c\u6210\u961f\u5217（CQ）\u3002\u8fd9\u4e0d\u4ec5\u62b9\u5e73\u4e86\u6587\u4ef6 I\/O \u4e0e\u7f51\u7edc\u4e8b\u4ef6\u4e4b\u95f4\u7684\u5272\u88c2，\u66f4\u4e3a\u767e\u4e07\u7ea7\u5e76\u53d1\u670d\u52a1\u5668\u8d4b\u4e88\u4e86\u524d\u6240\u672a\u6709\u7684\u541e\u5410\u80fd\u529b\u3002<\/p>\n

\u5e95\u5c42\u673a\u7406\u900f\u89c6：IORING_OP_POLL_ADD vs epoll_ctl<\/h4>\n

\u8981\u7406\u89e3 IORING_OP_POLL_ADD \u7684\u5a01\u529b，\u5fc5\u987b\u4ece\u5185\u6838\u7b49\u5f85\u961f\u5217（Wait Queue）\u7684\u6302\u8f7d\u8def\u5f84\u5207\u5165：<\/p>\n

  • epoll \u7684\u6811\u72b6\u7ba1\u7406\u4e0e\u63a7\u5236\u6d41\u635f\u8017：\u5f53\u8c03\u7528 epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) \u65f6，\u5185\u6838\u5fc5\u987b\u5148\u901a\u8fc7\u54c8\u5e0c\u8868\u67e5\u627e\u76ee\u6807 struct file，\u7136\u540e\u5c06\u5176\u63d2\u5165\u7ea2\u9ed1\u6811（ep->rbr），\u540c\u65f6\u8fd8\u8981\u83b7\u53d6\u81ea\u65cb\u9501\u6216\u4e92\u65a5\u9501（ep->lock）\u3002\u5f53\u5927\u91cf\u5ba2\u6237\u7aef\u53d1\u751f\u9891\u7e41\u65ad\u8fde\u91cd\u8fde\u65f6，\u7ea2\u9ed1\u6811\u7684\u65cb\u8f6c\u5e73\u8861\u4e0e\u9501\u7b49\u5f85\u5f00\u9500\u6025\u5267\u98d9\u5347\u3002<\/li>\n
  • io_uring \u7684\u76f4\u63a5\u56de\u8c03\u6302\u8f7d（Direct Callback Insertion）：IORING_OP_POLL_ADD \u5c06\u6bcf\u6b21\u76d1\u542c\u8bf7\u6c42\u5efa\u6a21\u4e3a\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u63d0\u4ea4\u961f\u5217\u9879（SQE）\u3002\u5f53 SQE \u88ab\u5185\u6838\u6d88\u8d39\u65f6，\u5185\u6838\u76f4\u63a5\u8c03\u7528\u76ee\u6807\u5957\u63a5\u5b57\u5e95\u5c42\u6587\u4ef6\u64cd\u4f5c\u96c6\u4e2d\u7684 file->f_op->poll()，\u5e76\u5c06\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u7b49\u5f85\u961f\u5217\u6761\u76ee（struct io_poll_iocb）\u6302\u5165\u5957\u63a5\u5b57\u81ea\u8eab\u7684\u7b49\u5f85\u5934（sk_sleep(sk)）\u3002\u8fd9\u91cc\u5b8c\u5168\u6ca1\u6709\u5168\u5c40\u7ea2\u9ed1\u6811\u7684\u5f00\u9500，\u6240\u6709\u72b6\u6001\u5747\u4f9d\u6258 io_uring \u81ea\u8eab\u7684\u65e0\u9501\u73af\u5f62\u7f13\u51b2\u533a\u8fdb\u884c\u95ed\u73af\u7ba1\u7406\u3002<\/li>\n
  • \u591a\u91cd\u8f6e\u8be2\u6a21\u5f0f（IORING_POLL_ADD_MULTI）：\u5728\u65e9\u671f\u7684 io_uring \u4e2d，IORING_OP_POLL_ADD \u662f\u201c\u4e00\u6b21\u6027\u89e6\u53d1（One-shot）\u201d\u7684，\u4e8b\u4ef6\u5c31\u7eea\u5e76\u4ea7\u751f CQE \u540e\u76d1\u542c\u81ea\u52a8\u6ce8\u9500，\u5fc5\u987b\u91cd\u65b0\u63d0\u4ea4 SQE\u3002\u81ea Linux 5.13 \u8d77，\u5f15\u5165\u4e86 IORING_POLL_ADD_MULTI \u6807\u5fd7，\u4f7f\u8f6e\u8be2\u8f6c\u53d8\u4e3a\u201c\u6301\u4e45\u5316\u6301\u7eed\u76d1\u542c\u201d：\u53ea\u8981\u6ca1\u6709\u88ab\u663e\u5f0f\u53d6\u6d88\u6216\u5bf9\u7aef\u5173\u95ed，\u53ea\u8981\u5e95\u5c42\u4ea7\u751f\u65b0\u7684\u53ef\u8bfb\u5199\u4e8b\u4ef6，\u5185\u6838\u5c31\u4f1a\u6e90\u6e90\u4e0d\u65ad\u5730\u751f\u6210\u643a\u5e26 IORING_CQE_F_MORE \u6807\u5fd7\u7684 CQE，\u5f7b\u5e95\u6d88\u9664\u4e86\u6d77\u91cf\u957f\u8fde\u63a5\u5728\u8fd0\u884c\u65f6\u7684\u4efb\u4f55\u91cd\u6ce8\u518c\u6210\u672c\u3002<\/li>\n

    [\u767e\u4e07\u5ba2\u6237\u7aef TCP \u8fde\u63a5\u6c60]
    \n |
    \n[\u63d0\u4ea4 IORING_OP_POLL_ADD \u6279\u91cf\u4efb\u52a1] (\u901a\u8fc7\u7528\u6237\u6001\u65e0\u9501\u73af\u5f62\u961f\u5217 SQ \u96f6\u62f7\u8d1d\u63d0\u4ea4)
    \n |
    \n[\u5185\u6838\u9a71\u52a8\u5c42] —> \u76f4\u63a5\u5c06 io_poll_iocb \u6ce8\u518c\u8fdb sk->sk_sleep
    \n |
    \n (\u7f51\u7edc\u6570\u636e\u5305\u5230\u8fbe \/ \u5524\u9192\u4e2d\u65ad)
    \n v
    \n[\u5185\u6838\u7b49\u5f85\u961f\u5217\u56de\u8c03 io_poll_wake] —> \u751f\u6210\u5c31\u7eea\u4e8b\u4ef6
    \n |
    \n +—> \u82e5\u914d\u7f6e\u4e86 MULTI: \u4fdd\u6301\u6302\u8f7d，\u4ea7\u751f CQE (\u8bbe\u7f6e IORING_CQE_F_MORE)
    \n +—> \u82e5\u672a\u914d\u7f6e MULTI: \u89e3\u9664\u6302\u8f7d，\u4ea7\u751f\u5355\u6b21 CQE
    \n |
    \n[\u7528\u6237\u6001\u73af\u5f62\u961f\u5217 CQ] <— \u5e94\u7528\u7a0b\u5e8f\u6279\u91cf\u6279\u91cf\u635e\u53d6，0 \u6b21\u7cfb\u7edf\u8c03\u7528\u7cfb\u7edf\u9677\u5165<\/p>\n

    C23 \u6807\u51c6\u5b9e\u6218：\u767e\u4e07\u957f\u8fde\u63a5\u4e8b\u4ef6\u8f6e\u8be2\u9a71\u52a8\u6838\u5fc3<\/h4>\n

    \u4e0b\u9762\u7ed9\u51fa\u7b26\u5408 C23 \u6807\u51c6\u7684\u9ad8\u6027\u80fd\u7f51\u7edc\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u6838\u5fc3\u5b9e\u73b0\u3002\u4ee3\u7801\u8fd0\u7528\u4e86\u663e\u5f0f\u5e38\u91cf\u3001\u5185\u5b58\u5bf9\u9f50\u4e0e\u7cfb\u7edf\u8c03\u7528\u5305\u88c5\u5668，\u6f14\u793a\u5982\u4f55\u6279\u91cf\u6ce8\u518c\u4e0a\u4e07\u4e2a\u5957\u63a5\u5b57\u7684\u4e8b\u4ef6\u76d1\u542c\u5e76\u5b9e\u73b0\u6301\u4e45\u5316\u8f6e\u8be2\u3002<\/p>\n

    #define _GNU_SOURCE
    \n#include <stdio.h>
    \n#include <stdlib.h>
    \n#include <stdint.h>
    \n#include <stdbool.h>
    \n#include <string.h>
    \n#include <unistd.h>
    \n#include <fcntl.h>
    \n#include <errno.h>
    \n#include <poll.h>
    \n#include <sys\/socket.h>
    \n#include <netinet\/in.h>
    \n#include <linux\/io_uring.h>
    \n#include <sys\/syscall.h>
    \n#include <sys\/mman.h><\/p>\n

    constexpr size_t QUEUE_DEPTH = 4096;
    \nconstexpr size_t BATCH_SUBMIT = 64;<\/p>\n

    static inline int io_uring_setup(uint32_t entries, struct io_uring_params *p) {
    \n return (int)syscall(__NR_io_uring_setup, entries, p);
    \n}<\/p>\n

    static inline int io_uring_enter(int fd, uint32_t to_submit, uint32_t min_complete,
    \n uint32_t flags, sigset_t *sig) {
    \n return (int)syscall(__NR_io_uring_enter, fd, to_submit, min_complete, flags, sig);
    \n}<\/p>\n

    \/\/ \u73af\u5f62\u961f\u5217\u6307\u9488\u7ba1\u7406\u7ed3\u6784\u4f53
    \ntypedef struct {
    \n int ring_fd;
    \n uint32_t *sq_head;
    \n uint32_t *sq_tail;
    \n uint32_t *sq_ring_mask;
    \n uint32_t *sq_array;
    \n struct io_uring_sqe *sqes;<\/p>\n

    uint32_t *cq_head;
    \n uint32_t *cq_tail;
    \n uint32_t *cq_ring_mask;
    \n struct io_uring_cqe *cqes;
    \n} UringContext;<\/p>\n

    \/\/ \u6ce8\u518c\u5957\u63a5\u5b57\u7684\u6301\u4e45\u5316\u5f02\u6b65\u4e8b\u4ef6\u8f6e\u8be2 (Poll Add Multi)
    \nbool add_socket_poll_multishot(UringContext *ctx, int socket_fd, uint32_t poll_mask) {
    \n uint32_t tail = *ctx->sq_tail;
    \n uint32_t head = *ctx->sq_head;
    \n uint32_t mask = *ctx->sq_ring_mask;<\/p>\n

    if (tail – head >= QUEUE_DEPTH) {
    \n return false; \/\/ \u961f\u5217\u6ea2\u51fa
    \n }<\/p>\n

    uint32_t index = tail & mask;
    \n struct io_uring_sqe *sqe = &ctx->sqes[index];
    \n memset(sqe, 0, sizeof(*sqe));<\/p>\n

    sqe->opcode = IORING_OP_POLL_ADD;
    \n sqe->fd = socket_fd;
    \n sqe->poll_events = poll_mask; \/\/ \u5982 POLLIN | POLLRDHUP
    \n sqe->len = IORING_POLL_ADD_MULTI; \/\/ \u5173\u952e：\u5f00\u542f\u6301\u4e45\u5316\u6301\u7eed\u76d1\u542c
    \n sqe->user_data = (uint64_t)socket_fd; \/\/ \u643a\u5e26\u4e0a\u4e0b\u6587\u53e5\u67c4<\/p>\n

    ctx->sq_array[index] = index;
    \n __atomic_store_n(ctx->sq_tail, tail + 1, __ATOMIC_RELEASE);
    \n return true;
    \n}<\/p>\n

    \/\/ \u6279\u91cf\u6536\u5272\u5df2\u5c31\u7eea\u4e8b\u4ef6\u5e76\u6267\u884c\u96f6\u62f7\u8d1d I\/O \u8c03\u5ea6
    \nsize_t reap_ready_events(UringContext *ctx, size_t max_events) {
    \n uint32_t head = *ctx->cq_head;
    \n uint32_t tail = __atomic_load_n(ctx->cq_tail, __ATOMIC_ACQUIRE);
    \n uint32_t mask = *ctx->cq_ring_mask;
    \n size_t reaped = 0;<\/p>\n

    while (head != tail && reaped < max_events) {
    \n uint32_t index = head & mask;
    \n struct io_uring_cqe *cqe = &ctx->cqes[index];<\/p>\n

    int socket_fd = (int)cqe->user_data;
    \n int res = cqe->res;<\/p>\n

    if (res < 0) {
    \n fprintf(stderr, "[-] \u5957\u63a5\u5b57 %d \u8f6e\u8be2\u5f02\u5e38: %s\\\\n", socket_fd, strerror(-res));
    \n } else {
    \n uint32_t revents = (uint32_t)res;
    \n if (revents & POLLIN) {
    \n \/\/ \u5957\u63a5\u5b57\u53ef\u8bfb，\u5728\u6b64\u5904\u53ef\u8054\u52a8\u63d0\u4ea4 IORING_OP_RECV \u6216\u6267\u884c\u7528\u6237\u6001\u534f\u8bae\u89e3\u6790
    \n \/\/ \u6b64\u65f6\u6570\u636e\u5df2\u5c31\u7eea，\u65e0\u9700\u518d\u8c03\u7528 epoll_wait
    \n }
    \n if (revents & (POLLERR | POLLHUP | POLLRDHUP)) {
    \n \/\/ \u8fde\u63a5\u65ad\u5f00\u6216\u5f02\u5e38，\u5173\u95ed\u5957\u63a5\u5b57
    \n close(socket_fd);
    \n }
    \n }<\/p>\n

    \/\/ \u68c0\u67e5\u662f\u5426\u4ecd\u7136\u5177\u5907\u591a\u91cd\u76d1\u542c\u6548\u529b
    \n if (!(cqe->flags & IORING_CQE_F_MORE)) {
    \n \/\/ \u82e5\u672a\u8bbe\u7f6e F_MORE，\u8bf4\u660e\u8be5\u5957\u63a5\u5b57\u5355\u6b21\u76d1\u542c\u5df2\u5931\u6548\u6216\u9047\u5230\u7ec8\u6b62\u9519\u8bef
    \n }<\/p>\n

    head++;
    \n reaped++;
    \n }<\/p>\n

    __atomic_store_n(ctx->cq_head, head, __ATOMIC_RELEASE);
    \n return reaped;
    \n}<\/p>\n

    \u767e\u4e07\u5e76\u53d1\u5b9e\u6218\u4e2d\u7684\u67b6\u6784\u8c03\u4f18\u4e0e\u5185\u5b58\u8fb9\u754c<\/h4>\n

    \u5728\u5b9e\u9645\u538b\u6d4b 100 \u4e07\u957f\u8fde\u63a5\u5e76\u53d1\u73af\u5883\u65f6，\u5fc5\u987b\u7279\u522b\u6ce8\u610f\u4ee5\u4e0b\u4e24\u9879\u7cfb\u7edf\u7ea7\u8c03\u4f18：<\/p>\n

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