windows环境下，gevent会出现ffi.from_handle()的错误

[jiapengwei]

报错信息：
Fatal Python error: ffi.from_handle() detected that the address passed points to garbage. If it is really the result of ffi.new_handle(), then the Python object has already been garbage collected

Thread 0x00002d30 (most recent call first):
File "D:\ProgramData\Anaconda3\lib\site-packages\gevent_threading.py", line 60 in wait
File "D:\ProgramData\Anaconda3\lib\site-packages\gevent_threading.py", line 146 in get
File "D:\ProgramData\Anaconda3\lib\site-packages\gevent\threadpool.py", line 155 in run