io_uring_submit_and_wait(3)     liburing Manual    io_uring_submit_and_wait(3)

NAME
       io_uring_submit_and_wait - submit requests to the submission queue and
       wait for completion

SYNOPSIS
       #include <liburing.h>

       int io_uring_submit_and_wait(struct io_uring *ring,
                                    unsigned wait_nr);

DESCRIPTION
       The io_uring_submit_and_wait(3) function submits the next requests from
       the submission queue belonging to the ring and waits for wait_nr
       completion events.

       After the caller retrieves a submission queue entry (SQE) with
       io_uring_get_sqe(3) and prepares the SQE, it can be submitted with
       io_uring_submit_and_wait(3).

       Ideally used with a ring setup with
       IORING_SETUP_SINGLE_ISSUER|IORING_SETUP_DEFER_TASKRUN as that will
       greatly reduce the number of context switches that an application will
       see waiting on multiple requests.


RETURN VALUE
       On success io_uring_submit_and_wait(3) returns the number of submitted
       submission queue entries. On failure it returns -errno.

SEE ALSO
       io_uring_queue_init_params(3), io_uring_get_sqe(3), io_uring_submit(3),
       io_uring_submit_and_wait_timeout(3)

liburing-2.1                   November 15, 2021   io_uring_submit_and_wait(3)