Hello everybody!
When I call fork() inside a daemon thread, the main thread in the child
process has the "daemon" property set to True. This is very confusing,
since the program keeps running while the only thread is a daemon.
According to the docs, if all the threads are daemons the program should
exit. Here is an example:
import os
import threading
def child():
assert not threading.current_thread().daemon # This shouldn't fail
def parent():
new_pid = os.fork()
if new_pid == 0:
child()
else:
os.waitpid(new_pid, 0)
t = threading.Thread(target=parent)
t.setDaemon(True)
t.start()
t.join()
Is it a bug in the CPython implementation?
Also let's assume the second example. I have another non-daemon thread
in the child process and want to detect this situation. Does anybody
know a way to find such fake daemon threads that are really main
threads?
Best regards,
Elizaveta Shashkova.
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