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Fix symbol resolution race #872

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Fix symbol resolution race #872

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Commits on Aug 22, 2022

  1. Refactor native library loading 

    This simplifies the process of supporting multiple paths for native
code loading and allows cleanup to occur on non-windows platforms when
the libllvmlite shared library is extracted to a temporary directory.
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    folded committed Aug 22, 2022
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  2. Avoid potential race condition in symbol lookup. 

    If two threads attempt to resolve the same symbol at the same time,
then both may test the symbol dictionary before the other has a chance
to insert a wrapper object, leading to both threads creating their
own wrapper.

Add double checked locking to avoid this possibility.
    @folded
    folded committed Aug 22, 2022
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  3. add cfn back, fix flake8

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    folded committed Aug 22, 2022
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