出现错误“TypeError：无法pickle”_cffi_backend.FFI“对象”在Python中

Question

这个 cffi 库是通过某些依赖项安装的，现在它出现了这个错误：

File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.1264.0_x64__qbz5n2kfra8p0\lib\multiprocessing\pool.py", line 372, in 
starmap
    return self._map_async(func, iterable, starmapstar, chunksize).get()
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.1264.0_x64__qbz5n2kfra8p0\lib\multiprocessing\pool.py", line 771, in 
get
    raise self._value
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.1264.0_x64__qbz5n2kfra8p0\lib\multiprocessing\pool.py", line 537, in 
_handle_tasks
    put(task)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.1264.0_x64__qbz5n2kfra8p0\lib\multiprocessing\connection.py", line 211, in send
    self._send_bytes(_ForkingPickler.dumps(obj))
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.1264.0_x64__qbz5n2kfra8p0\lib\multiprocessing\reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
TypeError: cannot pickle '_cffi_backend.FFI' object

出现错误的代码点是这样的：

    if parallel_process is True:
        print("Start parallel processing")
        with multiprocessing.Pool() as pool:
            boxes = pool.starmap(      <<<----- Here is where the traceback reports the error
                action,
                zip(
                    boxes,
                    repeat(var1),
                    repeat(var2),
                    repeat(var3),
                    repeat(var4),
                ),
            )

我做了一些研究，但唯一发现的是这个错误修正报告，但我不知道如何实现它： https://github.com/mcpyproject/McPy/pull/20

我的环境是 Windows 10 pro、python 3.10.4 和 cffi 1.15.0。

编辑

我发现只有当parallel_process为True时才会出现错误，否则，池不会执行，错误也不会出现。综上所述，我认为 cffi 与 python 的多处理功能不兼容。

有人知道是这样吗？