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 training product	x
Atlas inference product	√
Atlas 200I/500 A2 inference product	√

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.

Prototype

C 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);

Python Function

        
             event, event_num, ret = acl.himpi.sys_wait_epoll(epoll_fd, max_events, timeout)

Parameters

Parameter	Description
epoll_fd	Int, pointer address of the media data processing epoll file descriptor. The file descriptor is created by calling acl.himpi.sys_create_epoll.
max_events	Int, maximum number of events. Must not exceed the number of elements in the events array.
timeout	Int, timeout interval, in milliseconds. -1: permanently blocked. 0: no timeout. > 0: timeout interval.

Return Value

Return Value	Description
event	list: saves the generated event information. For details, see hi_dvpp_epoll_event.
event_num	Int, number of events occurred on the epoll instance.
ret	Int, error code. 0 indicates success. Other values indicate failures. For details, see Common Return Codes.

Description

event

list: saves the generated event information. For details, see hi_dvpp_epoll_event.

event_num

Int, number of events occurred on the epoll instance.

ret

Int, error code.

0 indicates success.

Other values indicate failures. For details, see Common Return Codes.

Restrictions

acl.himpi.sys_create_epoll, acl.himpi.sys_ctl_epoll, acl.himpi.sys_wait_epoll, and acl.himpi.sys_close_epoll must be used together to operate the input and output data of the media data processing channel by using the epoll programming model.
The VPC function does not support this API.

Reference

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

For details about the API call sequence and sample code, see JPEGE.

Parent topic: Common APIs