Golang cl.CLReleaseKernel函数代码示例

//.........这里部分代码省略.........
	// Associate the input and output buffers with the
	// kernel
	// using clSetKernelArg()
	status = cl.CLSetKernelArg(kernel,
		0,
		cl.CL_size_t(unsafe.Sizeof(bufferA)),
		unsafe.Pointer(&bufferA))
	status |= cl.CLSetKernelArg(kernel,
		1,
		cl.CL_size_t(unsafe.Sizeof(bufferB)),
		unsafe.Pointer(&bufferB))
	status |= cl.CLSetKernelArg(kernel,
		2,
		cl.CL_size_t(unsafe.Sizeof(bufferC)),
		unsafe.Pointer(&bufferC))
	if status != cl.CL_SUCCESS {
		println("CLSetKernelArg status!=cl.CL_SUCCESS")
		return
	}
	//-----------------------------------------------------
	// STEP 10: Configure the work-item structure
	//-----------------------------------------------------

	// Define an index space (global work size) of work
	// items for
	// execution. A workgroup size (local work size) is not
	// required,
	// but can be used.
	var globalWorkSize [1]cl.CL_size_t
	// There are 'elements' work-items
	globalWorkSize[0] = elements

	//-----------------------------------------------------
	// STEP 11: Enqueue the kernel for execution
	//-----------------------------------------------------

	// Execute the kernel by using
	// clEnqueueNDRangeKernel().
	// 'globalWorkSize' is the 1D dimension of the
	// work-items
	status = cl.CLEnqueueNDRangeKernel(cmdQueue,
		kernel,
		1,
		nil,
		globalWorkSize[:],
		nil,
		0,
		nil,
		nil)
	if status != cl.CL_SUCCESS {
		println("CLEnqueueNDRangeKernel status!=cl.CL_SUCCESS")
		return
	}
	//-----------------------------------------------------
	// STEP 12: Read the output buffer back to the host
	//-----------------------------------------------------

	// Use clEnqueueReadBuffer() to read the OpenCL output
	// buffer (bufferC)
	// to the host output array (C)
	cl.CLEnqueueReadBuffer(cmdQueue,
		bufferC,
		cl.CL_TRUE,
		0,
		datasize,
		unsafe.Pointer(&C[0]),
		0,
		nil,
		nil)
	if status != cl.CL_SUCCESS {
		println("CLEnqueueReadBuffer status!=cl.CL_SUCCESS")
		return
	}
	// Verify the output
	result := true
	for i := cl.CL_int(0); i < cl.CL_int(elements); i++ {
		if C[i] != i+i {
			result = false
			break
		}
	}
	if result {
		println("Output is correct\n")
	} else {
		println("Output is incorrect\n")
	}

	//-----------------------------------------------------
	// STEP 13: Release OpenCL resources
	//-----------------------------------------------------

	// Free OpenCL resources
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseProgram(program)
	cl.CLReleaseCommandQueue(cmdQueue)
	cl.CLReleaseMemObject(bufferA)
	cl.CLReleaseMemObject(bufferB)
	cl.CLReleaseMemObject(bufferC)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	f = cl.CL_int(filterWidth)
	status = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(d_inputImage)), unsafe.Pointer(&d_inputImage))
	status |= cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(d_outputImage)), unsafe.Pointer(&d_outputImage))
	status |= cl.CLSetKernelArg(kernel, 2, cl.CL_size_t(unsafe.Sizeof(h)), unsafe.Pointer(&h))
	status |= cl.CLSetKernelArg(kernel, 3, cl.CL_size_t(unsafe.Sizeof(w)), unsafe.Pointer(&w))
	status |= cl.CLSetKernelArg(kernel, 4, cl.CL_size_t(unsafe.Sizeof(d_filter)), unsafe.Pointer(&d_filter))
	status |= cl.CLSetKernelArg(kernel, 5, cl.CL_size_t(unsafe.Sizeof(f)), unsafe.Pointer(&f))
	status |= cl.CLSetKernelArg(kernel, 6, cl.CL_size_t(unsafe.Sizeof(sampler)), unsafe.Pointer(&sampler))
	chk(status, "clSetKernelArg")

	// Set the work item dimensions
	var globalSize = [2]cl.CL_size_t{imageWidth, imageHeight}
	status = cl.CLEnqueueNDRangeKernel(queue, kernel, 2, nil, globalSize[:], nil, 0,
		nil, nil)
	chk(status, "clEnqueueNDRange")

	// Read the image back to the host
	status = cl.CLEnqueueReadImage(queue, d_outputImage, cl.CL_TRUE, origin,
		region, 0, 0, unsafe.Pointer(&outputImage[0]), 0, nil, nil)
	chk(status, "clEnqueueReadImage")

	// Write the output image to file
	for i = 0; i < imageHeight*imageWidth; i++ {
		outputpixels[i] = uint16(outputImage[i])
	}
	utils.Write_image_data(outputFile, outputpixels, imageWidth, imageHeight)

	// Compute the reference image
	for i = 0; i < imageHeight; i++ {
		for j = 0; j < imageWidth; j++ {
			refImage[i*imageWidth+j] = 0
		}
	}

	// Iterate over the rows of the source image
	halfFilterWidth := filterWidth / 2
	var sum float32
	for i = 0; i < imageHeight; i++ {
		// Iterate over the columns of the source image
		for j = 0; j < imageWidth; j++ {
			sum = 0 // Reset sum for new source pixel
			// Apply the filter to the neighborhood
			for k := -halfFilterWidth; k <= halfFilterWidth; k++ {
				for l := -halfFilterWidth; l <= halfFilterWidth; l++ {
					if i+k >= 0 && i+k < imageHeight &&
						j+l >= 0 && j+l < imageWidth {
						sum += inputImage[(i+k)*imageWidth+j+l] *
							filter[(k+halfFilterWidth)*filterWidth+
								l+halfFilterWidth]
					} else {
						i_k := i + k
						j_l := j + l
						if i+k < 0 {
							i_k = 0
						} else if i+k >= imageHeight {
							i_k = imageHeight - 1
						}
						if j+l < 0 {
							j_l = 0
						} else if j+l >= imageWidth {
							j_l = imageWidth - 1
						}
						sum += inputImage[(i_k)*imageWidth+j_l] *
							filter[(k+halfFilterWidth)*filterWidth+
								l+halfFilterWidth]
					}
				}
			}
			refImage[i*imageWidth+j] = sum
		}
	}
	// Write the ref image to file
	for i = 0; i < imageHeight*imageWidth; i++ {
		outputpixels[i] = uint16(refImage[i])
	}
	utils.Write_image_data(refFile, outputpixels, imageWidth, imageHeight)

	failed := 0
	for i = 0; i < imageHeight; i++ {
		for j = 0; j < imageWidth; j++ {
			if math.Abs(float64(outputImage[i*imageWidth+j]-refImage[i*imageWidth+j])) > 0.01 {
				//fmt.Printf("Results are INCORRECT\n");
				//fmt.Printf("Pixel mismatch at <%d,%d> (%f vs. %f) %f\n", i, j,
				//   outputImage[i*imageWidth+j], refImage[i*imageWidth+j], inputImage[i*imageWidth+j]);
				failed++
			}
		}
	}
	fmt.Printf("Mismatch Pixel number/Total pixel number = %d/%d\n", failed, imageWidth*imageHeight)

	// Free OpenCL resources
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseMemObject(d_inputImage)
	cl.CLReleaseMemObject(d_outputImage)
	cl.CLReleaseMemObject(d_filter)
	cl.CLReleaseSampler(sampler)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	var err cl.CL_int

	var err1 error
	var global_size [2]cl.CL_size_t

	/* Image data */
	var pixels []uint16
	var png_format cl.CL_image_format
	var input_image, output_image cl.CL_mem
	var origin, region [3]cl.CL_size_t
	var width, height cl.CL_size_t

	/* Open input file and read image data */
	pixels, width, height, err1 = utils.Read_image_data(INPUT_FILE)
	if err1 != nil {
		return
	} else {
		fmt.Printf("width=%d, height=%d", width, height)
	}

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		fmt.Printf("Couldn't create a kernel: %d", err)
		return
	}

	/* Create image object */
	png_format.Image_channel_order = cl.CL_LUMINANCE
	png_format.Image_channel_data_type = cl.CL_UNORM_INT16
	input_image = cl.CLCreateImage2D(context,
		cl.CL_MEM_READ_ONLY|cl.CL_MEM_COPY_HOST_PTR,
		&png_format, width, height, 0, unsafe.Pointer(&pixels[0]), &err)
	output_image = cl.CLCreateImage2D(context,
		cl.CL_MEM_WRITE_ONLY, &png_format, width, height, 0, nil, &err)
	if err < 0 {
		println("Couldn't create the image object")
		return
	}

	/* Create kernel arguments */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(input_image)), unsafe.Pointer(&input_image))
	err |= cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(output_image)), unsafe.Pointer(&output_image))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	global_size[0] = width
	global_size[1] = height
	err = cl.CLEnqueueNDRangeKernel(queue, kernel, 2, nil, global_size[:],
		nil, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read the image object */
	origin[0] = 0
	origin[1] = 0
	origin[2] = 0
	region[0] = width
	region[1] = height
	region[2] = 1
	err = cl.CLEnqueueReadImage(queue, output_image, cl.CL_TRUE, origin,
		region, 0, 0, unsafe.Pointer(&pixels[0]), 0, nil, nil)
	if err < 0 {
		println("Couldn't read from the image object")
		return
	}

	/* Create output PNG file and write data */
	utils.Write_image_data(OUTPUT_FILE, pixels, width, height)

	/* Deallocate resources */
	cl.CLReleaseMemObject(input_image)
	cl.CLReleaseMemObject(output_image)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)

}

func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and buffers */
	var select1 [4]float32
	var select2 [2]cl.CL_uchar
	var select1_buffer, select2_buffer cl.CL_mem

	/* Create a context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a write-only buffer to hold the output data */
	select1_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(select1)), nil, &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}
	select2_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(select2)), nil, &err)

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(select1_buffer)), unsafe.Pointer(&select1_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(select2_buffer)), unsafe.Pointer(&select2_buffer))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read and print the result */
	err = cl.CLEnqueueReadBuffer(queue, select1_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(select1)), unsafe.Pointer(&select1), 0, nil, nil)
	if err < 0 {
		println("Couldn't read the buffer")
		return
	}
	cl.CLEnqueueReadBuffer(queue, select2_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(select2)), unsafe.Pointer(&select2), 0, nil, nil)

	fmt.Printf("select: ")
	for i := 0; i < 3; i++ {
		fmt.Printf("%.2f, ", select1[i])
	}
	fmt.Printf("%.2f\n", select1[3])

	fmt.Printf("bitselect: %X, %X\n", select2[0], select2[1])

	/* Deallocate resources */
	cl.CLReleaseMemObject(select1_buffer)
	cl.CLReleaseMemObject(select2_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

func (this *kernel) Release() error {
	if errCode := cl.CLReleaseKernel(this.kernel_id); errCode != cl.CL_SUCCESS {
		return fmt.Errorf("Release failure with errcode_ret %d: %s", errCode, cl.ERROR_CODES_STRINGS[-errCode])
	}
	return nil
}

func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and buffers */
	var r_coords = [4]float32{2, 1, 3, 4}
	var angles = [4]float32{3 * M_PI / 8, 3 * M_PI / 4, 4 * M_PI / 3, 11 * M_PI / 6}
	var x_coords, y_coords [4]float32
	var r_coords_buffer, angles_buffer,
		x_coords_buffer, y_coords_buffer cl.CL_mem

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a write-only buffer to hold the output data */
	r_coords_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|cl.CL_MEM_COPY_HOST_PTR,
		cl.CL_size_t(unsafe.Sizeof(r_coords)), unsafe.Pointer(&r_coords[0]), &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}
	angles_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|cl.CL_MEM_COPY_HOST_PTR,
		cl.CL_size_t(unsafe.Sizeof(angles)), unsafe.Pointer(&angles[0]), &err)
	x_coords_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE,
		cl.CL_size_t(unsafe.Sizeof(x_coords)), nil, &err)
	y_coords_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE,
		cl.CL_size_t(unsafe.Sizeof(y_coords)), nil, &err)

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(r_coords_buffer)), unsafe.Pointer(&r_coords_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(angles_buffer)), unsafe.Pointer(&angles_buffer))
	cl.CLSetKernelArg(kernel, 2, cl.CL_size_t(unsafe.Sizeof(x_coords_buffer)), unsafe.Pointer(&x_coords_buffer))
	cl.CLSetKernelArg(kernel, 3, cl.CL_size_t(unsafe.Sizeof(y_coords_buffer)), unsafe.Pointer(&y_coords_buffer))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read and print the result */
	err = cl.CLEnqueueReadBuffer(queue, x_coords_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(x_coords)), unsafe.Pointer(&x_coords), 0, nil, nil)
	if err < 0 {
		println("Couldn't read the buffer")
		return
	}
	cl.CLEnqueueReadBuffer(queue, y_coords_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(y_coords)), unsafe.Pointer(&y_coords), 0, nil, nil)

	/* Display the results */
	for i := 0; i < 4; i++ {
		fmt.Printf("(%6.3f, %6.3f)\n", x_coords[i], y_coords[i])
	}

	/* Deallocate resources */
	cl.CLReleaseMemObject(r_coords_buffer)
	cl.CLReleaseMemObject(angles_buffer)
	cl.CLReleaseMemObject(x_coords_buffer)
	cl.CLReleaseMemObject(y_coords_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	var offset, global_size, local_size [1]cl.CL_size_t

	/* Data and events */
	var data [2]cl.CL_int
	var data_buffer cl.CL_mem

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold data */
	data_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*2, nil, &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(data_buffer)), unsafe.Pointer(&data_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	offset[0] = 0
	global_size[0] = 8
	local_size[0] = 4
	err = cl.CLEnqueueNDRangeKernel(queue, kernel, 1, offset[:], global_size[:], local_size[:], 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read the buffer */
	err = cl.CLEnqueueReadBuffer(queue, data_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*2, unsafe.Pointer(&data[0]), 0, nil, nil)
	if err < 0 {
		println("Couldn't read the buffer")
		return
	}

	fmt.Printf("Increment: %d\n", data[0])
	fmt.Printf("Atomic increment: %d\n", data[1])

	/* Deallocate resources */
	cl.CLReleaseMemObject(data_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	defer cl.CLReleaseProgram(program)

	// Build (compile) the program for the devices with
	// clBuildProgram()
	options := "-cl-std=CL2.0"
	status = cl.CLBuildProgram(program,
		numDevices,
		devices,
		[]byte(options),
		nil,
		nil)
	if status != cl.CL_SUCCESS {
		var program_log interface{}
		var log_size cl.CL_size_t

		/* Find size of log and print to std output */
		cl.CLGetProgramBuildInfo(program, devices[0], cl.CL_PROGRAM_BUILD_LOG,
			0, nil, &log_size)
		cl.CLGetProgramBuildInfo(program, devices[0], cl.CL_PROGRAM_BUILD_LOG,
			log_size, &program_log, nil)
		fmt.Printf("%s\n", program_log)
		return
	}
	//utils.CHECK_STATUS(status, cl.CL_SUCCESS, "CLBuildProgram")

	//-----------------------------------------------------
	// STEP 7: Create the kernel
	//-----------------------------------------------------
	var kernel cl.CL_kernel

	// Use clCreateKernel() to create a kernel
	kernel = cl.CLCreateKernel(program, []byte("bst_kernel"), &status)
	utils.CHECK_STATUS(status, cl.CL_SUCCESS, "CLCreateKernel")
	defer cl.CLReleaseKernel(kernel)

	//-----------------------------------------------------
	// STEP 8: Set the kernel arguments
	//-----------------------------------------------------
	// Associate the input and output buffers with the
	// kernel
	// using clSetKernelArg()
	// Set appropriate arguments to the kernel
	status = cl.CLSetKernelArgSVMPointer(kernel,
		0,
		svmTreeBuf)
	utils.CHECK_STATUS(status, cl.CL_SUCCESS, "clSetKernelArgSVMPointer(svmTreeBuf)")

	status = cl.CLSetKernelArgSVMPointer(kernel,
		1,
		svmSearchBuf)
	utils.CHECK_STATUS(status, cl.CL_SUCCESS, "clSetKernelArgSVMPointer(svmSearchBuf)")

	//-----------------------------------------------------
	// STEP 9: Configure the work-item structure
	//-----------------------------------------------------
	// Define an index space (global work size) of work
	// items for
	// execution. A workgroup size (local work size) is not
	// required,
	// but can be used.
	var localWorkSize [1]cl.CL_size_t
	var kernelWorkGroupSize interface{}
	status = cl.CLGetKernelWorkGroupInfo(kernel,
		devices[0],
		cl.CL_KERNEL_WORK_GROUP_SIZE,
		cl.CL_size_t(unsafe.Sizeof(localWorkSize[0])),

//.........这里部分代码省略.........

	/* Initialize arrays */
	for i := 0; i < 100; i++ {
		data_one[i] = 1.0 * float32(i)
		data_two[i] = -1.0 * float32(i)
		result_array[i] = 0.0
	}

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create the kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, []byte(KERNEL_FUNC), &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create buffers */
	buffer_one = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(data_one)), unsafe.Pointer(&data_one[0]), &err)
	if err < 0 {
		println("Couldn't create buffer object 1")
		return
	}
	buffer_two = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(data_two)), unsafe.Pointer(&data_two), &err)
	if err < 0 {
		println("Couldn't create buffer object 2")
		return
	}
	/* Set buffers as arguments to the kernel */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(buffer_one)), unsafe.Pointer(&buffer_one))
	err |= cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(buffer_two)), unsafe.Pointer(&buffer_two))
	if err < 0 {
		println("Couldn't set the buffer as the kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Enqueue command to copy buffer one to buffer two */
	err = cl.CLEnqueueCopyBuffer(queue, buffer_one, buffer_two, 0, 0,
		cl.CL_size_t(unsafe.Sizeof(data_one)), 0, nil, nil)
	if err < 0 {
		println("Couldn't perform the buffer copy")
		return
	}

	/* Enqueue command to map buffer two to host memory */
	mapped_memory = cl.CLEnqueueMapBuffer(queue, buffer_two, cl.CL_TRUE,
		cl.CL_MAP_READ, 0, cl.CL_size_t(unsafe.Sizeof(data_two)), 0, nil, nil, &err)
	if err < 0 {
		println("Couldn't map the buffer to host memory")
		return
	}

	/* Transfer memory and unmap the buffer */
	C.memcpy(unsafe.Pointer(&result_array[0]), mapped_memory, C.size_t(unsafe.Sizeof(data_two)))
	err = cl.CLEnqueueUnmapMemObject(queue, buffer_two, mapped_memory,
		0, nil, nil)
	if err < 0 {
		println("Couldn't unmap the buffer")
		return
	}

	/* Display updated buffer */
	for i := 0; i < 10; i++ {
		for j := 0; j < 10; j++ {
			fmt.Printf("%6.1f", result_array[j+i*10])
		}
		fmt.Printf("\n")
	}

	/* Deallocate resources */
	cl.CLReleaseMemObject(buffer_one)
	cl.CLReleaseMemObject(buffer_two)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	/* Extension data */
	var sizeofuint cl.CL_uint
	var addr_data interface{}
	var ext_data interface{}
	fp64_ext := "cl_khr_fp64"
	var ext_size cl.CL_size_t
	var options []byte

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Obtain the device data */
	if cl.CLGetDeviceInfo(device[0], cl.CL_DEVICE_ADDRESS_BITS,
		cl.CL_size_t(unsafe.Sizeof(sizeofuint)), &addr_data, nil) < 0 {
		println("Couldn't read extension data")
		return
	}
	fmt.Printf("Address width: %v\n", addr_data.(cl.CL_uint))

	/* Define "FP_64" option if doubles are supported */
	cl.CLGetDeviceInfo(device[0], cl.CL_DEVICE_EXTENSIONS,
		0, nil, &ext_size)
	// ext_data = (char*)malloc(ext_size + 1);
	// ext_data[ext_size] = '\0';
	cl.CLGetDeviceInfo(device[0], cl.CL_DEVICE_EXTENSIONS,
		ext_size, &ext_data, nil)
	if strings.Contains(ext_data.(string), fp64_ext) {
		fmt.Printf("The %s extension is supported.\n", fp64_ext)
		options = []byte("-DFP_64 ")
	} else {
		fmt.Printf("The %s extension is not supported. %s\n", fp64_ext, ext_data.(string))
	}

	/* Build the program and create the kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, options)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create CL buffers to hold input and output data */
	a_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(a)), unsafe.Pointer(&a), &err)
	if err < 0 {
		println("Couldn't create a memory object")
		return
	}

	b_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(b)), unsafe.Pointer(&b), nil)
	output_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(b)), nil, nil)

	/* Create kernel arguments */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(a_buffer)), unsafe.Pointer(&a_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(b_buffer)), unsafe.Pointer(&b_buffer))
	cl.CLSetKernelArg(kernel, 2, cl.CL_size_t(unsafe.Sizeof(output_buffer)), unsafe.Pointer(&output_buffer))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read and print the result */
	err = cl.CLEnqueueReadBuffer(queue, output_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(result)), unsafe.Pointer(&result), 0, nil, nil)
	if err < 0 {
		println("Couldn't read the output buffer")
		return
	}
	fmt.Printf("The kernel result is %f\n", result)

	/* Deallocate resources */
	cl.CLReleaseMemObject(a_buffer)
	cl.CLReleaseMemObject(b_buffer)
	cl.CLReleaseMemObject(output_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and events */
	var num_ints cl.CL_int
	var num_items [1]cl.CL_size_t
	var data [NUM_INTS]cl.CL_int
	var data_buffer cl.CL_mem
	var prof_event cl.CL_event
	var total_time cl.CL_ulong
	var time_start, time_end interface{}

	/* Initialize data */
	for i := 0; i < NUM_INTS; i++ {
		data[i] = cl.CL_int(i)
	}

	/* Set number of data points and work-items */
	num_ints = NUM_INTS
	num_items[0] = NUM_ITEMS

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold data */
	data_buffer = cl.CLCreateBuffer(context,
		cl.CL_MEM_READ_WRITE|cl.CL_MEM_COPY_HOST_PTR,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_INTS, unsafe.Pointer(&data[0]), &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(data_buffer)), unsafe.Pointer(&data_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(num_ints)), unsafe.Pointer(&num_ints))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0],
		cl.CL_QUEUE_PROFILING_ENABLE, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	total_time = 0.0
	for i := 0; i < NUM_ITERATIONS; i++ {

		/* Enqueue kernel */
		cl.CLEnqueueNDRangeKernel(queue, kernel, 1, nil, num_items[:],
			nil, 0, nil, &prof_event)
		if err < 0 {
			println("Couldn't enqueue the kernel")
			return
		}

		/* Finish processing the queue and get profiling information */
		cl.CLFinish(queue)
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_START,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_start, nil)
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_END,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_end, nil)
		total_time += time_end.(cl.CL_ulong) - time_start.(cl.CL_ulong)
	}
	fmt.Printf("Average time = %v\n", total_time/NUM_ITERATIONS)

	/* Deallocate resources */
	cl.CLReleaseEvent(prof_event)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseMemObject(data_buffer)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and buffers */
	var full_matrix, zero_matrix [80]float32
	var sizeoffloat32 = cl.CL_size_t(unsafe.Sizeof(full_matrix[0]))
	var buffer_origin = [3]cl.CL_size_t{5 * sizeoffloat32, 3, 0}
	var host_origin = [3]cl.CL_size_t{1 * sizeoffloat32, 1, 0}
	var region = [3]cl.CL_size_t{4 * sizeoffloat32, 4, 1}
	var matrix_buffer cl.CL_mem

	/* Initialize data */
	for i := 0; i < 80; i++ {
		full_matrix[i] = float32(i) * 1.0
		zero_matrix[i] = 0.0
	}

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create the kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	if program == nil {
		println("Couldn't build program")
		return
	}

	kernel = cl.CLCreateKernel(*program, []byte(KERNEL_FUNC), &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold 80 floats */
	matrix_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(full_matrix)), unsafe.Pointer(&full_matrix[0]), &err)
	if err < 0 {
		println("Couldn't create a buffer object")
		return
	}

	/* Set buffer as argument to the kernel */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(matrix_buffer)), unsafe.Pointer(&matrix_buffer))
	if err < 0 {
		println("Couldn't set the buffer as the kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Enqueue command to write to buffer */
	err = cl.CLEnqueueWriteBuffer(queue, matrix_buffer, cl.CL_TRUE, 0,
		cl.CL_size_t(unsafe.Sizeof(full_matrix)), unsafe.Pointer(&full_matrix[0]), 0, nil, nil)
	if err < 0 {
		println("Couldn't write to the buffer object")
		return
	}

	/* Enqueue command to read rectangle of data */
	err = cl.CLEnqueueReadBufferRect(queue, matrix_buffer, cl.CL_TRUE,
		buffer_origin, host_origin, region, 10*sizeoffloat32, 0,
		10*sizeoffloat32, 0, unsafe.Pointer(&zero_matrix[0]), 0, nil, nil)
	if err < 0 {
		println("Couldn't read the rectangle from the buffer object")
		return
	}

	/* Display updated buffer */
	for i := 0; i < 8; i++ {
		for j := 0; j < 10; j++ {
			fmt.Printf("%6.1f", zero_matrix[j+i*10])
		}
		fmt.Printf("\n")
	}

	/* Deallocate resources */
	cl.CLReleaseMemObject(matrix_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold data */
	data_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, nil, &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(data_buffer)), unsafe.Pointer(&data_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}

	/* Tell kernel number of char16 vectors */
	num_vectors = NUM_BYTES / 16
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(num_vectors)), unsafe.Pointer(&num_vectors))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0],
		cl.CL_QUEUE_PROFILING_ENABLE, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	total_time = 0.0
	for i := 0; i < NUM_ITERATIONS; i++ {

		/* Enqueue kernel */
		err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
		if err < 0 {
			println("Couldn't enqueue the kernel")
			return
		}

		if PROFILE_READ == 1 {
			/* Read the buffer */
			err = cl.CLEnqueueReadBuffer(queue, data_buffer, cl.CL_TRUE, 0,
				cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, unsafe.Pointer(&data[0]), 0, nil, &prof_event)
			if err < 0 {
				println("Couldn't read the buffer")
				return
			}
		} else {
			/* Create memory map */
			mapped_memory = cl.CLEnqueueMapBuffer(queue, data_buffer, cl.CL_TRUE,
				cl.CL_MAP_READ, 0, cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, 0, nil, &prof_event, &err)
			if err < 0 {
				println("Couldn't map the buffer to host memory")
				return
			}
		}

		/* Get profiling information */
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_START,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_start, nil)
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_END,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_end, nil)
		total_time += time_end.(cl.CL_ulong) - time_start.(cl.CL_ulong)

		if PROFILE_READ == 0 {
			/* Unmap the buffer */
			err = cl.CLEnqueueUnmapMemObject(queue, data_buffer, mapped_memory,
				0, nil, nil)
			if err < 0 {
				println("Couldn't unmap the buffer")
				return
			}
		}
	}

	if PROFILE_READ == 1 {
		fmt.Printf("Average read time: %v\n", total_time/NUM_ITERATIONS)
	} else {
		fmt.Printf("Average map time: %v\n", total_time/NUM_ITERATIONS)
	}

	/* Deallocate resources */
	cl.CLReleaseEvent(prof_event)
	cl.CLReleaseMemObject(data_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........
	if err2 != nil {
		t.Errorf("Couldn't find the program stat")
	}
	program_size[0] = cl.CL_size_t(fi.Size())
	program_buffer[0] = make([]byte, program_size[0])
	read_size, err3 := program_handle.Read(program_buffer[0])
	if err3 != nil || cl.CL_size_t(read_size) != program_size[0] {
		t.Errorf("read file error or file size wrong")
	}

	/* Create a program containing all program content */
	program = cl.CLCreateProgramWithSource(context, 1,
		program_buffer[:], program_size[:], &err)
	if err < 0 {
		t.Errorf("Couldn't create the program")
	}

	/* Build program */
	err = cl.CLBuildProgram(program, 1, device[:], nil, nil, nil)
	if err < 0 {
		/* Find size of log and print to std output */
		cl.CLGetProgramBuildInfo(program, device[0], cl.CL_PROGRAM_BUILD_LOG,
			0, nil, &log_size)
		//program_log = (char*) malloc(log_size+1);
		//program_log[log_size] = '\0';
		cl.CLGetProgramBuildInfo(program, device[0], cl.CL_PROGRAM_BUILD_LOG,
			log_size, &program_log, nil)
		t.Errorf("%s\n", program_log)
		//free(program_log);
	}

	/* Create kernel for the mat_vec_mult function */
	kernel = cl.CLCreateKernel(program, []byte("matvec_mult"), &err)
	if err < 0 {
		t.Errorf("Couldn't create the kernel")
		return
	}

	/* Create CL buffers to hold input and output data */
	mat_buff = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(mat)), unsafe.Pointer(&mat[0]), &err)
	if err < 0 {
		t.Errorf("Couldn't create a buffer object")
		return
	}
	vec_buff = cl.CLCreateBuffer(context, cl.CL_MEM_READ_ONLY|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(vec)), unsafe.Pointer(&vec[0]), nil)
	res_buff = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(result)), nil, nil)

	/* Create kernel arguments from the CL buffers */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(mat_buff)), unsafe.Pointer(&mat_buff))
	if err < 0 {
		t.Errorf("Couldn't set the kernel argument")
		return
	}
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(vec_buff)), unsafe.Pointer(&vec_buff))
	cl.CLSetKernelArg(kernel, 2, cl.CL_size_t(unsafe.Sizeof(res_buff)), unsafe.Pointer(&res_buff))

	/* Create a CL command queue for the device*/
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		t.Errorf("Couldn't create the command queue, errcode=%d\n", err)
		return
	}

	/* Enqueue the command queue to the device */
	var work_units_per_kernel = [1]cl.CL_size_t{4} /* 4 work-units per kernel */
	err = cl.CLEnqueueNDRangeKernel(queue, kernel, 1, nil, work_units_per_kernel[:],
		nil, 0, nil, nil)
	if err < 0 {
		t.Errorf("Couldn't enqueue the kernel execution command, errcode=%d\n", err)
		return
	}

	/* Read the result */
	err = cl.CLEnqueueReadBuffer(queue, res_buff, cl.CL_TRUE, 0, cl.CL_size_t(unsafe.Sizeof(result)),
		unsafe.Pointer(&result[0]), 0, nil, nil)
	if err < 0 {
		t.Errorf("Couldn't enqueue the read buffer command")
		return
	}

	/* Test the result */
	if (result[0] == correct[0]) && (result[1] == correct[1]) &&
		(result[2] == correct[2]) && (result[3] == correct[3]) {
		t.Logf("Matrix-vector multiplication successful.")
	} else {
		t.Errorf("Matrix-vector multiplication unsuccessful.")
	}

	/* Deallocate resources */
	cl.CLReleaseMemObject(mat_buff)
	cl.CLReleaseMemObject(vec_buff)
	cl.CLReleaseMemObject(res_buff)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(program)
	cl.CLReleaseContext(context)
}

//.........这里部分代码省略.........

	/* Initialize data */
	data = make([]float32, 4)
	for i := 0; i < 4; i++ {
		data[i] = float32(i) * 1.0
	}

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold data */
	data_buffer = cl.CLCreateBuffer(context,
		cl.CL_MEM_READ_WRITE|cl.CL_MEM_COPY_HOST_PTR,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*4, unsafe.Pointer(&data[0]), &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(data_buffer)), unsafe.Pointer(&data_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0],
		cl.CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Configure events */
	user_event[0] = cl.CLCreateUserEvent(context, &err)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 1, user_event[:], &kernel_event[0])
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Read the buffer */
	err = cl.CLEnqueueReadBuffer(queue, data_buffer, cl.CL_FALSE, 0,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*4, unsafe.Pointer(&data[0]), 1, kernel_event[:], &read_event[0])
	if err < 0 {
		println("Couldn't read the buffer")
		return
	}

	/* Set callback for event */
	err = cl.CLSetEventCallback(read_event[0], cl.CL_COMPLETE,
		read_complete, unsafe.Pointer(&data))
	if err < 0 {
		println("Couldn't set callback for event")
		return
	}

	/* Sleep for a second to demonstrate the that commands haven't
	   started executing. Then prompt user */
	time.Sleep(1)
	fmt.Printf("Old data: %4.2f, %4.2f, %4.2f, %4.2f\n",
		data[0], data[1], data[2], data[3])
	fmt.Printf("Press ENTER to continue.\n")
	//getchar();
	reader := bufio.NewReader(os.Stdin)
	reader.ReadString('\n')

	/* Set user event to success */
	cl.CLSetUserEventStatus(user_event[0], cl.CL_SUCCESS)

	/* Deallocate resources */
	cl.CLReleaseEvent(read_event[0])
	cl.CLReleaseEvent(kernel_event[0])
	cl.CLReleaseEvent(user_event[0])
	cl.CLReleaseMemObject(data_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}