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From: Josef <[email protected]>
To: Jens Axboe <[email protected]>,
	Pavel Begunkov <[email protected]>,
	[email protected]
Cc: [email protected]
Subject: Re: io_uring process termination/killing is not working
Date: Sun, 16 Aug 2020 02:36:53 +0200	[thread overview]
Message-ID: <CAAss7+r8CZMVmxj0_mHTPUVbp3BzT4LGa2uEUjCK1NpXQnDkdw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>

[-- Attachment #1: Type: text/plain, Size: 375 bytes --]

> Please try:
>
> https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.9&id=41d3344604e80db0e466f9deca5262b0914e4827
>
> There was a bug with the -EAGAIN doing repeated retries on sockets that
> are marked non-blocking.
>

no it's not working, however I received the read event after
the second request (instead of the third request before) via Telnet

--
Josef Grieb

[-- Attachment #2: io_uring_read_issue.c --]
[-- Type: text/x-c-code, Size: 2619 bytes --]

#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/socket.h>
#include <unistd.h>
#include <poll.h>
#include "liburing.h"

#define BACKLOG 512

#define PORT 9700

struct io_uring ring;

char buf[100];

void add_poll(int fd, unsigned int poll_mask) {
    struct io_uring_sqe *sqe = io_uring_get_sqe(&ring);
    io_uring_prep_poll_add(sqe, fd, poll_mask);
    sqe->user_data = 1;
    sqe->flags |= IOSQE_IO_LINK;
}

void add_accept(int fd) {
    struct io_uring_sqe *sqe = io_uring_get_sqe(&ring);
    io_uring_prep_accept(sqe, fd, 0, 0, SOCK_NONBLOCK | SOCK_CLOEXEC);
    sqe->user_data = 2;
}

void add_read(int fd) {
    struct io_uring_sqe *sqe = io_uring_get_sqe(&ring);
    io_uring_prep_read(sqe, fd, &buf, 100, 0);
    sqe->user_data = 3;
}

int setup_io_uring() {
    int ret = io_uring_queue_init(16, &ring, 0);
    if (ret) {
        fprintf(stderr, "Unable to setup io_uring: %s\n", strerror(-ret));
        return 1;
    }
    return 0;
}

int main(int argc, char *argv[]) {

    struct sockaddr_in serv_addr;

    setup_io_uring();
    
    int sock_listen_fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
    const int val = 1;
    setsockopt(sock_listen_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    serv_addr.sin_addr.s_addr = INADDR_ANY;

    if (bind(sock_listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
         perror("Error binding socket\n");
         exit(1);
     }
    if (listen(sock_listen_fd, BACKLOG) < 0) {
         perror("Error listening on socket\n");
         exit(1);
    }

    setup_io_uring();

    add_poll(sock_listen_fd, POLLIN);
    add_accept(sock_listen_fd);
    io_uring_submit(&ring);

    while (1) {
        struct io_uring_cqe *cqe;
        io_uring_wait_cqe(&ring, &cqe);

        printf("Res: res: %d\n", cqe->res);
        
        if (cqe->user_data == 1) {
            printf("Poll Event\n");
        }
        
        if (cqe->user_data == 2 && cqe->res > 0) {
            printf("Accept Event\n");
                    
            add_poll(sock_listen_fd, POLLIN);
            add_accept(sock_listen_fd);

            add_poll(cqe->res, POLLIN);
            add_read(cqe->res);
        }

        if (cqe->user_data == 3) {
            printf("Read Buf: %s \n", buf);
        }
        io_uring_submit(&ring);

        io_uring_cqe_seen(&ring, cqe);
    }

    io_uring_queue_exit(&ring);

    return 0;
}

  reply	other threads:[~2020-08-16  0:37 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-12 17:58 io_uring process termination/killing is not working Josef
2020-08-12 18:05 ` Jens Axboe
2020-08-12 18:20   ` Pavel Begunkov
2020-08-12 18:22     ` Pavel Begunkov
2020-08-12 18:28       ` Pavel Begunkov
2020-08-12 23:32         ` Jens Axboe
2020-08-13 16:07           ` Josef
2020-08-13 16:09             ` Jens Axboe
2020-08-15  7:45           ` Pavel Begunkov
2020-08-15 15:12             ` Jens Axboe
2020-08-15 16:48               ` Pavel Begunkov
2020-08-15 21:43                 ` Josef
2020-08-15 22:35                   ` Jens Axboe
2020-08-15 23:21                     ` Josef
2020-08-15 23:31                     ` Jens Axboe
2020-08-16  0:36                       ` Josef [this message]
2020-08-16  0:41                         ` Jens Axboe
2020-08-16  1:21                           ` Jens Axboe
2020-08-16  3:14                             ` Josef
2020-08-16  3:20                               ` Jens Axboe
2020-08-16 17:30                                 ` Jens Axboe
2020-08-16 21:09                                   ` Josef
2020-08-16 22:17                                     ` Jens Axboe
2020-08-17  8:58                                       ` Josef
2020-08-17 10:08                                         ` Pavel Begunkov
2020-08-16 13:45                 ` Jens Axboe
2020-08-16 14:53                   ` Jens Axboe
2020-08-16 15:22                     ` Jens Axboe
2020-08-17 10:16                       ` Pavel Begunkov

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