C Specification

The list of platforms available can be obtained with the function:

cl_int clGetPlatformIDs(
    cl_uint num_entries,
    cl_platform_id* platforms,
    cl_uint* num_platforms);


  • num_entries is the number of cl_platform_id entries that can be added to platforms. If platforms is not NULL, the num_entries must be greater than zero.

  • platforms returns a list of OpenCL platforms found. The cl_platform_id values returned in platforms can be used to identify a specific OpenCL platform. If platforms is NULL, this argument is ignored. The number of OpenCL platforms returned is the minimum of the value specified by num_entries or the number of OpenCL platforms available.

  • num_platforms returns the number of OpenCL platforms available. If num_platforms is NULL, this argument is ignored.


clGetPlatformIDs returns CL_​SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:

  • CL_​INVALID_​VALUE if num_entries is equal to zero and platforms is not NULL or if both num_platforms and platforms are NULL.

  • CL_​OUT_​OF_​HOST_​MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

See Also

Document Notes

For more information, see the OpenCL Specification

This page is extracted from the OpenCL Specification. Fixes and changes should be made to the Specification, not directly.

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.