human
Solve the following python programming problem given the following code:
def consume_in_thread(self) : 
    'Consumer from all queues/consumers in a greenthread.' 
    def _consumer_thread() : 
        try : 
            self.consume () 
except greenlet.GreenletExit : 
            return 
if (self.consumer_thread is None) : 
        self.consumer_thread = eventlet.spawn (<MASK>) 
return self.consumer_thread 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def _consumer_thread(