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by marcan_42
2404 days ago
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It's standard procedure. I've done the exact same thing when wrapping C APIs into Python using Cython, several times. You pass the Python closure as the void *data and then register a shared generic callback which casts it and calls it. Easy. Getting the memory management right is slightly tricky, but not too bad. Fun fact: you can't safely do this with ctypes. Since it is called as pure Python, it cannot do watertight Python exception handling in a callback context (because even if you have a try/except block, an exception can always happen right before or after it), and ctypes provides no usable internal way of doing it - it just eats exceptions inside callbacks. This is what motivated me to rewrite Ceph's librbd bindings from ctypes to Cython. |
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