hi_mpi_sys_wait_epoll

Applicable Products

Product	Supported
Ascend 950PR / Ascend 950DT	√
Atlas A3 training products / Atlas A3 inference products	√
Atlas A2 training products / Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	√
Atlas inference products	√
Atlas training products	☓

Function

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.

hi_mpi_sys_create_epoll, hi_mpi_sys_ctl_epoll, hi_mpi_sys_wait_epoll, and hi_mpi_sys_close_epoll must be used together to operate the input and output data of the media data processing channel through 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	File descriptor of the epoll instance for media data processing.
events	Output	hi_dvpp_epoll_event array for the event information.
max_events	Input	Maximum number of events. The value must not exceed the number of elements in the events array.
timeout	Input	Timeout interval, in ms. -1: permanently blocked. 0: no timeout. Value greater than 0: timeout interval.
event_num	Output	Pointer to the number of events occurred on the epoll instance.

Returns

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

Reference

For details about the API call sequence and example, see JPEGE and VENC.

Parent topic: Common APIs