id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
4185	ChimeraX bug report submission	Andrei Istrate		"{{{
The following bug report has been submitted:
Platform:        macOS-10.16-x86_64-i386-64bit
ChimeraX Version: 1.2.dev202101090324 (2021-01-09 03:24:40 UTC)
Description
There is a problem with using multiprocessing in scripts ran by ChimeraX after the update from Python 3.7 to Python 3.8 on mac.

The problem comes from the requirement to protect the “entry point” of the program by using if __name__ == '__main__'

Like this:

from multiprocessing import Process

def slave(a):
    print(a)

if __name__ == '__main__':
    thread_list = []
    for i in range(4):
        t = Process(target=slave, args=(i,))
        thread_list.append(t)
    for thread in thread_list:
        thread.start()
    for thread in thread_list:
        thread.join()
"	defect	new	normal		Unassigned