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.

For kernels not created from OpenCL C source and the clCreateProgramWithSource API call the string returned from this query will be empty.

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.

Also see

Specification