release geodifflib on shutdown() for macOS - #261
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harminius wants to merge 1 commit into
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Fixes MerginMaps/qgis-plugin#867 and maybe MerginMaps/qgis-plugin#866
Problem:
shutdown()previously only released the library on Windows; on Linux/macOS it just dropped the Python reference, so ctypes never calleddlclose()and the image stayed mapped. On macOS the old and new copies of the library coexisted in the process resulting in QGIS to crash.Solution:
This makes
pygeodiff.shutdown()actually unload the library on macOS.Limitation:
dlclose()is best-effort - on modern Linux (glibc ≥ 2.34) the library often stays mapped anyway. However, the bug doesn't appear on Linux because it re-dlopen()the lib by its name (SONAME). This means only one copy is ever loaded - unfortunately, the old one.Also added a small guard so a failed load doesn't raise in
__del__.