STINNER Victor added the comment:
Hum, I should elaborate my explanation :-) os.fork() removes all threads except
of the current thread. It's clearly stated in the fork manual page, but the
Python os.fork() doesn't say anything about threads.
https://docs.python.org/dev/library/os.html#os.fork
Short example:
---
import os, threading, time
t = threading.Thread(target=time.sleep, args=(3.0,))
t.start()
print("First process", threading.enumerate())
pid = os.fork()
if pid != 0:
os.waitpid(pid, 0)
else:
print("Child process", threading.enumerate())
---
Output:
---
First process [<_MainThread(MainThread, started 140737353955072)>,
<Thread(Thread-1, started 140737216849664)>]
Child process [<_MainThread(MainThread, started 140737353955072)>]
---
The thread is removed in the child process.
Again, *don't create threads before fork*. More generally, don't create any
resource before fork: don't open files, don't create locks, don't open a
connection to a database, don't start an event loop, etc.
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<http://bugs.python.org/issue26793>
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