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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);



Specifies the kernel object being queried.


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.


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


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.
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(3clc)__ qualifier with the kernel function declaration in the program source. These attributes include those on the __attribute(3clc)__ page and other attributes supported by an implementation. Attributes are returned as they were declared inside __attribute(3clc)__((...)), with any surrounding whitespace and embedded newlines removed. When multiple attributes are present, they are returned as a single, space delimited string.


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


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.


OpenCL Specification[1]


clCreateKernel(3clc), clCreateKernelsInProgram(3clc), clGetKernelArgInfo(3clc), clRetainKernel(3clc), clReleaseKernel(3clc), clSetKernelArg(3clc), clGetKernelWorkGroupInfo(3clc)


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OpenCL Specification
page 162, section 5.7.3 - Kernel Object Queries (updated for 1.2 rev 14)
01/14/2021 The Khronos Group