2016-09-26 16:59 GMT+02:00 lin li <sdeber@hotmail.com>:

I suspect that the time interval for the function suspend_until() may be too short.

if you don't explicitly put a fiber to sleep (sleep_until()/sleep_for()) suspend_until() sleeps forever.

If that is the case, then how can I increase it?

you should provide simple test code that demonstrates your problem