Cython currently segfaults when using a buffer in nogil and accessing
out of bounds (which triggers an IndexError). This is a bug, however I
would like to do more than disallow it.
I.e. what should happen here:
cdef object[int] buf = ... # buffer of length < 6
with nogil:
buf[5] = 0
Option 1) Reacquire the GIL temporarily to construct the IndexError
instance. This seems to work wonderfully in my current patch; but is it
too unintuitive to raise an exception from an operation in a nogil
section? Will any other operation trigger an exception within a nogil
section?
Option 2) Only allow buffer use in nogil if @cython.boundscheck(False).
This has some usability problems; it would be a pain to turn on/off
nogil for debugging.
Option 3) Print to standard output using printf instead of raising
exception.
--
Dag Sverre
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