hi_mpi_sys_create_epoll
Applicable Products
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Function
Creates an epoll instance for media data processing to allow you to use the epoll programming model to operate the input and output data of 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.
Parameters
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Parameter |
Input/Output |
Description |
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size |
Input |
Maximum number of DVPP channel file descriptors that can be processed by the epoll instance. This field is reserved. Set it to a positive number. |
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epoll_fd |
Output |
Pointer to the file descriptor of an epoll instance. The number of ile descriptors is restricted by the maximum number of files that can be opened at the same time in a task in the Linux OS, which can be viewed by using the ulimit -a command. |
Returns
- 0: success
- Other values: failure. For details, see Common Return Codes.
Restrictions
- For the following models, only epoll APIs (like hi_mpi_sys_create_epoll) described in this document are available, and the epoll functions of the Linux OS are not available.
Atlas inference products inAscend EP formAtlas 200I/500 A2 inference products Atlas A2 training products /Atlas A2 inference products Atlas A3 training products /Atlas A3 inference products Ascend 950PR /Ascend 950DT - For the following models, epoll APIs (like hi_mpi_sys_create_epoll) described in this document are equivalent to the epoll functions in the Linux OS.
Atlas inference products in Open Ctrl CPU form