void GetCpuUsage()

in src/process.cc [77:105]

• 24 lines of code
• 5 McCabe index (conditional complexity)

void GetCpuUsage(Cpu* cpu_info, uint32_t* process_index, BOOL first_pass) {
  DWORD pid = cpu_info[*process_index].pid;
  HANDLE hProcess;

  hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, false, pid);

  if (hProcess == NULL) {
    return;
  }

  FILETIME creationTime, exitTime, kernelTime, userTime;
  FILETIME sysIdleTime, sysKernelTime, sysUserTime;
  if (GetProcessTimes(hProcess, &creationTime, &exitTime, &kernelTime, &userTime)
    && GetSystemTimes(&sysIdleTime, &sysKernelTime, &sysUserTime)) {
    if (first_pass) {
      cpu_info[*process_index].initialProcRunTime = GetTotalTime(&kernelTime, &userTime);
      cpu_info[*process_index].initialSystemTime = GetTotalTime(&sysKernelTime, &sysUserTime);
    } else {
      ULONGLONG endProcTime = GetTotalTime(&kernelTime, &userTime);
      ULONGLONG endSysTime = GetTotalTime(&sysKernelTime, &sysUserTime);

      cpu_info[*process_index].cpu = 100.0 * (endProcTime - cpu_info[*process_index].initialProcRunTime) / (endSysTime - cpu_info[*process_index].initialSystemTime);
    }
  } else {
    cpu_info[*process_index].cpu = std::numeric_limits<double>::quiet_NaN();
  }

  CloseHandle(hProcess);
}