def search(self, line):
if self.tasklet is None:
self.reqchannel = Channel()
self.queued = {}
self.tasklet = Tasklet(self._checker)
self.tasklet()
ch = Channel()
if line in self.queued:
self.queued[line].append(ch)
else:
self.queued[line] = [ch]
self.reqchannel.send(line)
return ch.recv()
