def listener():
while 1:
# Make sure this thread can't die.
try:
try:
self, sender, kw = _signal_queue.get()
except ValueError:
log.error('Error unpacking queue item.', exc_info=True)
if self is _sentinel:
break
try:
Signal.sync_send(self, sender, **kw)
except Exception:
log.error('Error calling signal.', exc_info=True)
except Exception:
# Weird things happen during interpreter shutdown.
if log:
log.critical('Uncaught error.', exc_info=True)
def async_send(self, sender, **named):
# Bail early if no one is listening.
if not self.receivers:
return []
# Django depends on class_prepared being synchronous.
if self is models.signals.class_prepared:
return Signal.sync_send(self, sender, **named)
_signal_queue.put_nowait((self, sender, named))
return []
