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4 years ago
<?php // Usage processor in Windows using FFI
  if(!dl("ffi")) // Load the extension
    throw new Exception('Cound not load the FFI extension.');

  function GetSystemTimes()
  {
    static $Kernel32;
    $Kernel32??=FFI::cdef(<<<'IDL'
      bool GetSystemTimes(long long *IdleTime, long long *KernelTime, long long *UserTime);
      int GetLastError();
    IDL, 'Kernel32.dll');
    
    $IdleTime   = FFI::new('long long');
    $KernelTime = FFI::new('long long'); // already has idle time
    $UserTime   = FFI::new('long long');
  
    if($Kernel32->GetSystemTimes(FFI::addr($IdleTime), FFI::addr($KernelTime), FFI::addr($UserTime)))
      return [
        'Idle'   =>$IdleTime   ->cdata,
        'Kernel' =>$KernelTime ->cdata, // already has idle time
        'User'   =>$UserTime   ->cdata,
      ];
    return [];
  }
  
  function GetSystemTimesDelta()
  {
    static $Last=null;
    static $Delta=[0,1];
    $Times=GetSystemTimes();
    $Last??=$Times;
    $Idle =$Times['Idle'   ]-$Last['Idle'   ];
    $All  =$Times['Kernel' ]-$Last['Kernel' ]+  // Kernel already has idle time
           $Times['User'   ]-$Last['User'   ];
    if($All>1_000_000) // 100ms
    {
      $Delta=[$Idle, $All];
      $Last=$Times;
    }
    return $Delta;
  }

  function ProcessorLoad()
  {
    static $Load=0;
    [$Idle, $All]=GetSystemTimesDelta();
    if($All>0.0)
      $Load=1-$Idle/$All;
    return $Load;
  }
  
  function KbHit()
  {
    Static $Sys;
    $Sys??=FFI::cdef('bool _kbhit();', 'msvcrt.dll');
    return $Sys->_kbhit();
  }
  
  while(!KbHit())
  {
    echo str_pad((string)round(ProcessorLoad()*100), 3, ' ', STR_PAD_LEFT), "%\n";
    sleep(1);
  }
?>
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