hi_mpi_sys_wait_epoll

Applicability

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product / Atlas A3 inference product	√
Atlas A2 training product / Atlas A2 inference product	√
Atlas 200I/500 A2 inference product	√
Atlas inference product	√
Atlas training product	☓

Function Description

Waits for the epoll instance of media data processing to generate an event when the epoll model is used to perform input and output operations on the media data processing channel.

The hi_mpi_sys_create_epoll, hi_mpi_sys_ctl_epoll, hi_mpi_sys_wait_epoll, and hi_mpi_sys_close_epoll APIs must be used together to operate the input/output data of the media data processing channel using the epoll programming model. The VPC function does not support this API.

Prototype

hi_s32 hi_mpi_sys_wait_epoll(hi_s32 epoll_fd, hi_dvpp_epoll_event *events, hi_s32 max_events, hi_s32 timeout, hi_s32 *event_num)

Parameters

Parameter	Input/Output	Description
epoll_fd	Input	Pointer to the handle of the media data processing epoll instance.
events	Output	hi_dvpp_epoll_event array, which stores the generated event information.
max_events	Input	Maximum number of events that can be returned. The value cannot exceed the number of elements in the events array.
timeout	Input	Timeout interval (ms). -1: permanently blocked. 0: no timeout. > 0: timeout interval.
event_num	Output	Pointer to the number of events generated by the epoll.

Returns

0: success
Other values: failure. For details, see Common Return Codes.