clGetKernelInfo
clGetKernelInfo
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clGetKernelInfo Returns information about the kernel object.

##

cl_int `clGetKernelInfo` cl_kernel kernel cl_kernel_info param_name size_t param_value_size void *param_value size_t *param_value_size_ret

## Parameters

`kernel`

  Specifies the kernel object being queried.

`param_name`

  Specifies the information to query. The list of supported `param_name` types and the information returned in `param_value` by `clGetKernelInfo` is described in the table below.

`param_value`

  A pointer to memory where the appropriate result being queried is returned. If `param_value` is NULL, it is ignored.

`param_value_size`

  Used to specify the size in bytes of memory pointed to by `param_value`. This size must be ≥ size of return type as described in the table below.

  cl_kernel_info | Return Type | Info. returned in `param_value`
  --- | --- | ---
  `CL_KERNEL_FUNCTION_NAME` | char[] | Return the kernel function name.
  `CL_KERNEL_NUM_ARGS` | cl_uint | Return the number of arguments to `kernel`.
  `CL_KERNEL_REFERENCE_COUNT` | cl_uint | Return the `kernel` reference count. The reference count returned should be considered immediately stale. It is unsuitable for general use in applications. This feature is provided for identifying memory leaks.
  `CL_KERNEL_CONTEXT` | cl_context | Return the context associated with `kernel`.
  `CL_KERNEL_PROGRAM` | cl_program | Return the program object associated with `kernel`.
  `CL_KERNEL_ATTRIBUTES` | char[] | Returns any attributes specified using the __attribute__ qualifier with the kernel function declaration in the program source. These attributes include those on the __attribute__ page and other attributes supported by an implementation. Attributes are returned as they were declared inside __attribute__((...)), with any surrounding whitespace and embedded newlines removed. When multiple attributes are present, they are returned as a single, space delimited string.

`param_value_size_ret`

  the actual size in bytes of data copied to `param_value`. If `param_value_size_ret` is NULL, it is ignored.

## Errors

Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:

- CL_INVALID_VALUE if `param_name` is not valid, or if size in bytes specified by `param_value_size` is < size of return type as described in the table above and `param_value` is not NULL.
- CL_INVALID_KERNEL if `kernel` is not a valid kernel object.
- CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL implementation on the device.
- CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

## Specification

OpenCL Specification

## Also see

clCreateKernel, clCreateKernelsInProgram, clGetKernelArgInfo, clRetainKernel, clReleaseKernel, clSetKernelArg, clGetKernelWorkGroupInfo

##