func()

in sigar_common_darwin.go [115:166]

• 34 lines of code
• 4 McCabe index (conditional complexity)

func (self *CpuList) Get() error {
	var count C.mach_msg_type_number_t
	var cpuload *C.processor_cpu_load_info_data_t
	var ncpu C.natural_t

	status := C.host_processor_info(C.host_t(C.mach_host_self()),
		C.PROCESSOR_CPU_LOAD_INFO,
		&ncpu,
		(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
		&count)

	if status != C.KERN_SUCCESS {
		return fmt.Errorf("host_processor_info error=%d", status)
	}

	// jump through some cgo casting hoops and ensure we properly free
	// the memory that cpuload points to
	target := C.vm_map_t(C.mach_task_self_)
	address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
	defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))

	// the body of struct processor_cpu_load_info
	// aka processor_cpu_load_info_data_t
	var cpuTicks [C.CPU_STATE_MAX]uint32

	// copy the cpuload array to a []byte buffer
	// where we can binary.Read the data
	size := int(ncpu) * binary.Size(cpuTicks)
	buf := C.GoBytes(unsafe.Pointer(cpuload), C.int(size))

	bbuf := bytes.NewBuffer(buf)

	self.List = make([]Cpu, 0, ncpu)

	for i := 0; i < int(ncpu); i++ {
		cpu := Cpu{}

		err := binary.Read(bbuf, binary.LittleEndian, &cpuTicks)
		if err != nil {
			return err
		}

		cpu.User = uint64(cpuTicks[C.CPU_STATE_USER])
		cpu.Sys = uint64(cpuTicks[C.CPU_STATE_SYSTEM])
		cpu.Idle = uint64(cpuTicks[C.CPU_STATE_IDLE])
		cpu.Nice = uint64(cpuTicks[C.CPU_STATE_NICE])

		self.List = append(self.List, cpu)
	}

	return nil
}