[issue41344] SharedMemory crash when size is 0

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Python 3.10.0a0  Jul 23 2020, win32 (without patch)

>>> from multiprocessing import shared_memory
>>> shm_a = shared_memory.SharedMemory(create=True, size=0)
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    shm_a = shared_memory.SharedMemory(create=True, size=0)
  File "f:\dev\3x\lib\multiprocessing\shared_memory.py", line 129, in __init__
    h_map = _winapi.CreateFileMapping(
OSError: [WinError 87] The parameter is incorrect: 'wnsm_4ab39616'

After the patch, I get the value error.

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nosy: +terry.reedy
versions: +Python 3.10

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