inspectrunning.py

>>> import inspect
>>> import threading
>>> import time
>>>
>>> def gen():
...     yield 0
...     time.sleep(10)
...     yield 1
...
>>> a = gen()
>>>
>>> def t():
...     next(a)
...     next(a)
...
>>> threading.Thread(target=t).start()
>>> inspect.getgeneratorstate(a)
'GEN_RUNNING'