cpython/Lib/test/mp_preload.py

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import multiprocessing
multiprocessing.Lock()
def f():
print("ok")
if __name__ == "__main__":
ctx = multiprocessing.get_context("forkserver")
modname = "test.mp_preload"
# Make sure it's importable
__import__(modname)
ctx.set_forkserver_preload([modname])
proc = ctx.Process(target=f)
proc.start()
proc.join()