module Process

def setpriority(kind, int, int_priority)


* Process::ABOVE_NORMAL_PRIORITY_CLASS
* Process::BELOW_NORMAL_PRIORITY_CLASS
* Process::REALTIME_PRIORITY_CLASS
* Process::HIGH_PRIORITY_CLASS
* Process::IDLE_PRIORITY_CLASS
* Process::NORMAL_PRIORITY_CLASS

Possible +int_priority+ values are:

information, so it is effectively always Process::PRIO_PROCESS.
You can only retrieve process information, not process group or user
The +kind+ parameter is ignored but present for API compatibility.

Sets the priority class for the specified process id +int+. 
def setpriority(kind, int, int_priority)
  raise TypeError unless kind.is_a?(Integer)          # Match spec
  raise TypeError unless int.is_a?(Integer)           # Match spec
  raise TypeError unless int_priority.is_a?(Integer)  # Match spec
  int = Process.pid if int == 0                       # Match spec
  handle = OpenProcess(PROCESS_SET_INFORMATION, 0 , int)
  if handle == 0
    raise SystemCallError, FFI.errno, "OpenProcess"
  end
  begin
    unless SetPriorityClass(handle, int_priority)
      raise SystemCallError, FFI.errno, "SetPriorityClass"
    end
  ensure
    CloseHandle(handle)
  end
  0 # Match the spec
end