parameters: (self)
docstring: Mark the future as running or process any cancel notifications.
  
          Should only be used by Executor implementations and unit tests.
  
          If the future has been cancelled (cancel() was called and returned
          True) then any threads waiting on the future completing (though calls
          to as_completed() or wait()) are notified and False is returned.
  
          If the future was not cancelled then it is put in the running state
          (future calls to running() will return True) and True is returned.
  
          This method should be called by Executor implementations before
          executing the work associated with this future. If this method returns
          False then the work should not be executed.
  
          Returns:
              False if the Future was cancelled, True otherwise.
  
          Raises:
              RuntimeError: if this method was already called or if set_result()
                  or set_exception() was called.
docstring_summary: Mark the future as running or process any cancel notifications.
docstring_tokens: Mark the future as running or process any cancel notifications .
function: def set_running_or_notify_cancel(self):
          """Mark the future as running or process any cancel notifications.
  
          Should only be used by Executor implementations and unit tests.
  
          If the future has been cancelled (cancel() was called and returned
          True) then any threads waiting on the future completing (though calls
          to as_completed() or wait()) are notified and False is returned.
  
          If the future was not cancelled then it is put in the running state
          (future calls to running() will return True) and True is returned.
  
          This method should be called by Executor implementations before
          executing the work associated with this future. If this method returns
          False then the work should not be executed.
  
          Returns:
              False if the Future was cancelled, True otherwise.
  
          Raises:
              RuntimeError: if this method was already called or if set_result()
                  or set_exception() was called.
          """
          with self._condition:
              if self._state == CANCELLED:
                  self._state = CANCELLED_AND_NOTIFIED
                  for waiter in self._waiters:
                      waiter.add_cancelled(self)
                  # self._condition.notify_all() is not necessary because
                  # self.cancel() triggers a notification.
                  return False
              elif self._state == PENDING:
                  self._state = RUNNING
                  return True
              else:
                  LOGGER.critical('Future %s in unexpected state: %s',
                                  id(self.future),
                                  self.future._state)
                  raise RuntimeError('Future in unexpected state')
function_tokens: def set_running_or_notify_cancel ( self ) : with self . _condition : if self . _state == CANCELLED : self . _state = CANCELLED_AND_NOTIFIED for waiter in self . _waiters : waiter . add_cancelled ( self ) # self._condition.notify_all() is not necessary because # self.cancel() triggers a notification. return False elif self . _state == PENDING : self . _state = RUNNING return True else : LOGGER . critical ( 'Future %s in unexpected state: %s' , id ( self . future ) , self . future . _state ) raise RuntimeError ( 'Future in unexpected state' )