diff options
Diffstat (limited to 'test/ce593a6c480a.c')
-rw-r--r-- | test/ce593a6c480a.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/test/ce593a6c480a.c b/test/ce593a6c480a.c new file mode 100644 index 0000000..47de128 --- /dev/null +++ b/test/ce593a6c480a.c @@ -0,0 +1,136 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Test 5.7 regression with task_work not being run while a task is + * waiting on another event in the kernel. + */ +#include <errno.h> +#include <poll.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/eventfd.h> +#include <unistd.h> +#include <pthread.h> +#include "liburing.h" +#include "helpers.h" + +static int use_sqpoll = 0; + +void notify_fd(int fd) +{ + char buf[8] = {0, 0, 0, 0, 0, 0, 1}; + int ret; + + ret = write(fd, &buf, 8); + if (ret < 0) + perror("write"); +} + +void *delay_set_fd_from_thread(void *data) +{ + int fd = (intptr_t) data; + + sleep(1); + notify_fd(fd); + return NULL; +} + +int main(int argc, char *argv[]) +{ + struct io_uring_params p = {}; + struct io_uring ring; + int loop_fd, other_fd; + struct io_uring_sqe *sqe; + struct io_uring_cqe *cqe = NULL; + int ret, use_fd; + char buf[8] = {0, 0, 0, 0, 0, 0, 1}; + pthread_t tid; + + if (argc > 1) + return 0; + + /* Create an eventfd to be registered with the loop to be + * notified of events being ready + */ + loop_fd = eventfd(0, EFD_CLOEXEC); + if (loop_fd == -1) { + fprintf(stderr, "eventfd errno=%d\n", errno); + return 1; + } + + /* Create an eventfd that can create events */ + use_fd = other_fd = eventfd(0, EFD_CLOEXEC); + if (other_fd == -1) { + fprintf(stderr, "eventfd errno=%d\n", errno); + return 1; + } + + if (use_sqpoll) + p.flags = IORING_SETUP_SQPOLL; + + /* Setup the ring with a registered event fd to be notified on events */ + ret = t_create_ring_params(8, &ring, &p); + if (ret == T_SETUP_SKIP) + return 0; + else if (ret < 0) + return ret; + + ret = io_uring_register_eventfd(&ring, loop_fd); + if (ret < 0) { + fprintf(stderr, "register_eventfd=%d\n", ret); + return 1; + } + + if (use_sqpoll) { + ret = io_uring_register_files(&ring, &other_fd, 1); + if (ret < 0) { + fprintf(stderr, "register_files=%d\n", ret); + return 1; + } + use_fd = 0; + } + + /* Submit a poll operation to wait on an event in other_fd */ + sqe = io_uring_get_sqe(&ring); + io_uring_prep_poll_add(sqe, use_fd, POLLIN); + sqe->user_data = 1; + if (use_sqpoll) + sqe->flags |= IOSQE_FIXED_FILE; + ret = io_uring_submit(&ring); + if (ret != 1) { + fprintf(stderr, "submit=%d\n", ret); + return 1; + } + + /* + * CASE 3: Hangs forever in Linux 5.7.5; Works in Linux 5.6.0 When this + * code is uncommented, we don't se a notification on other_fd until + * _after_ we have started the read on loop_fd. In that case, the read() on + * loop_fd seems to hang forever. + */ + pthread_create(&tid, NULL, delay_set_fd_from_thread, + (void*) (intptr_t) other_fd); + + /* Wait on the event fd for an event to be ready */ + ret = read(loop_fd, buf, 8); + if (ret < 0) { + perror("read"); + return 1; + } else if (ret != 8) { + fprintf(stderr, "Odd-sized eventfd read: %d\n", ret); + return 1; + } + + + ret = io_uring_wait_cqe(&ring, &cqe); + if (ret) { + fprintf(stderr, "wait_cqe=%d\n", ret); + return ret; + } + if (cqe->res < 0) { + fprintf(stderr, "cqe->res=%d\n", cqe->res); + return 1; + } + + io_uring_cqe_seen(&ring, cqe); + return 0; +} |