File: mp_preload_flush.py

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import multiprocessing
import sys

modname = 'preloaded_module'
if __name__ == '__main__':
    if modname in sys.modules:
        raise AssertionError(f'{modname!r} is not in sys.modules')
    multiprocessing.set_start_method('forkserver')
    multiprocessing.set_forkserver_preload([modname])
    for _ in range(2):
        p = multiprocessing.Process()
        p.start()
        p.join()
elif modname not in sys.modules:
    raise AssertionError(f'{modname!r} is not in sys.modules')