[issue9990] PyMemoryView_FromObject alters the Py_buffer after calling PyObject_GetBuffer when ndim 1
Antoine Pitrou
report at bugs.python.org
Wed Dec 22 14:11:54 CET 2010
Antoine Pitrou <pitrou at free.fr> added the comment:
> (1) Is there documentation for the 'smalltable' field of the Py_buffer
> struct anywhere? What are the requirements for the exporter here?
No, and no particular requirements AFAIR. It is a piece of internal
storage aimed at avoiding the nagging allocation and ownership problem
(but only so when this storage is large enough, of course).
> E.g., is it / should it be a requirement that shape, strides and
> suboffsets are all NULL whenever 'smalltable' is used?
Not at all. On the contrary, smalltable can be used as a piece of
storage for some of these fields.
> (2) Same question for the 'obj' field: what's the purpose of this
> field, from the POV of 3rd party buffer exporters?
None, it's used by the consumer side of the API, to know which object
exported the buffer and to keep a reference to it so that it doesn't get
deallocated early.
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