io_uring_wait_cqe_timeout - wait for one io_uring completion event with timeout
#include <liburing.h>
int io_uring_wait_cqe_timeout(struct io_uring *ring,
struct io_uring_cqe **cqe_ptr,
struct __kernel_timespec *ts);
The function waits for one IO completion to
be available from the queue belonging to the
ring param, waiting for it
if necessary or until the timeout
ts expires. If an event is already
available in the ring when invoked, no waiting will occur.
The
cqe_ptr param is filled in on success.
If
ts is specified and an older kernel without
IORING_FEAT_EXT_ARG
is used, the application does not need to call
io_uring_submit(3)
before calling
io_uring_wait_cqes(3). For newer kernels with that
feature flag set, there is no implied submit when waiting for a request.
On success
io_uring_wait_cqes(3) returns 0 and the cqe_ptr param is
filled in. On failure it returns
-errno. The return value indicates the
result of waiting for a CQE, and it has no relation to the CQE result itself.
io_uring_submit(3), ,
io_uring_wait_cqe(3)