[3.8] bpo-40135: Fix multiprocessing test_shared_memory_across_processes() (GH-19892) #19903
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Don't define shared memory block's name in test_shared_memory_across_processes():
use SharedMemory(create=True) instead.
(cherry picked from commit caa3ef2)
Co-authored-by: Hai Shi shihai1992@gmail.com
https://bugs.python.org/issue40135