clCreateKernel
clCreateKernel
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3
clCreateKernel Creates a kernel object.

##

cl_kernel `clCreateKernel` cl_program program const char*kernel_name cl_int*errcode_ret

## Parameters

`program`

  A program object with a successfully built executable.

`kernel_name`

  A function name in the program declared with the `__kernel` qualifier

`errcode_ret`

  Returns an appropriate error code. If `errcode_ret` is NULL, no error code is returned.

## Notes

A kernel is a function declared in a program. A kernel is identified by the __kernel qualifier applied to any function in a program. A kernel object encapsulates the specific `__kernel` function declared in a program and the argument values to be used when executing this `__kernel` function.

## Errors

`clCreateKernel` returns a valid non-zero kernel object and `errcode_ret` is set to CL_SUCCESS if the kernel object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in `errcode_ret`:

- CL_INVALID_PROGRAM if `program` is not a valid program object.
- CL_INVALID_PROGRAM_EXECUTABLE if there is no successfully built executable for `program`.
- CL_INVALID_KERNEL_NAME if `kernel_name` is not found in `program`.
- CL_INVALID_KERNEL_DEFINITION if the function definition for `__kernel` function given by `kernel_name` such as the number of arguments, the argument types are not the same for all devices for which the `program` executable has been built.
- CL_INVALID_VALUE if `kernel_name` is NULL.
- 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

clCreateKernelsInProgram, clRetainKernel, clReleaseKernel, clSetKernelArg, clGetKernelInfo, clGetKernelWorkGroupInfo, Cardinality Diagram

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