Ist es sicher, grüne Threads und einheimische Threads in einem einzigen Python-Prozess zu mischen?

Question

Erstens ist es sicher, grüne Fäden wie Eventlet oder Gevent mit Python-Native-Threads aus der Standardbibliothek zu mischen, d. H. Lib / Threading.Py in demselben Python-Prozess?

Zweitens, wenn es sicher ist, ist es eine schlechte Idee?

Answer 1

With gevent < 1.0 it is most likely a bad idea, as libevent isn't thread safe. You might be okay if you make sure that the OS threads never interact with libevent… But that could be tricky, and bugs cause by libevent's lack of thread safety don't sound like any fun to debug.

However, gevent >= 1.0 uses libev, which is entirely thread safe. So (as far as I can tell) there's no problem mixing green threads and OS threads.

Answer 2

gevent provides monkey patching abilities for threads.

Greenlets only switch to eachother within one thread, so one thread's greenlets will be completely separate and incommunicado from another's.

I wouldn't suggest using multiple threads of greenlets until you've shown you have a performance need to do so.