Cython in Practice: A Deep Dive into Legacy C Integration and Debugging
summary
Cython wrapper for the Triangle C library compiles to under a thousand lines and ultimately runs on Linux Mac Windows after fixing concrete issues: an unsigned long size mismatch (4 vs 8 bytes) is changed to unsigned long long, pointer aliasing that causes double frees is replaced by copying, and holes/regions buffers are reallocated correctly. Runtime stepping uses GDB; memory corruption and invalid read/writes are diagnosed with Valgrind. Packaging uses Poetry then CI-built manylinux wheels with a uV/scikit-build workaround.
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chapters (11)
- 0:00Cython and legacy C
- 3:55Triangle library wrapper
- 7:44Cython conventions and types
- 10:51Memory corruption on Windows
- 13:43Valgrind for memory errors
- 16:55Data type compatibility
- 18:23Double-free memory errors
- 20:49Packaging with Poetry
- 22:57UV and scikit-build-core
- 24:00Key takeaways
- 25:22Q&A
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