Method: Process.setpriority

Defined in:
lib/win32/process.rb

.setpriority(kind, int, int_priority) ⇒ Object

Sets the priority class for the specified process id int.

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

Possible int_priority values are:

  • Process::NORMAL_PRIORITY_CLASS

  • Process::IDLE_PRIORITY_CLASS

  • Process::HIGH_PRIORITY_CLASS

  • Process::REALTIME_PRIORITY_CLASS

  • Process::BELOW_NORMAL_PRIORITY_CLASS

  • Process::ABOVE_NORMAL_PRIORITY_CLASS

Raises:

  • (TypeError) 


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# File 'lib/win32/process.rb', line 139

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, false , int)

  if handle == INVALID_HANDLE_VALUE
    raise SystemCallError, FFI.errno, "OpenProcess"
  end

  begin
    unless SetPriorityClass(handle, int_priority)
      raise SystemCallError, FFI.errno, "SetPriorityClass"
    end
  ensure
    CloseHandle(handle)
  end

  return 0 # Match the spec
end