[Numpy-discussion] Long-standing issue with using numpy in embedded CPython

[Yang Zhang]

On Tue, Oct 4, 2011 at 12:05 PM, Yang Zhang <yanghatespam at gmail.com> wrote:
> On Tue, Oct 4, 2011 at 1:28 AM, Robin <robince at gmail.com> wrote:
>> On Mon, Oct 3, 2011 at 9:42 PM, Yang Zhang <yanghatespam at gmail.com> wrote:
>>> It turns out that there's a long-standing problem in numpy that
>>> prevents it from being used in embedded CPython environments:
>>
>> Just wanted to make the point for reference that in general Numpy does
>> work fine in (non-threaded) embedded CPython situations, see for
>> example pymex [1] which embeds Python + Numpy in a Matlab mex file and
>> works really well.
>>
>> This seems to a be a problem specific to Jepp.
>>
>> Just wanted to mention it in case it puts someone off trying something
>> unnecessarily in the future.
>
> My (second-hand) understanding is that this is a problem with having
> multiple CPython interpreters, which both Jepp and numpy utilize,
> incompatibly - is that right?  I.e., if either one were restricted to
> using a single CPython interpreter, we wouldn't see this problem?
>
> I'm curious how to disable threads in numpy (not an ideal solution).
> Googling seems to point me to setting NPY_ALLOW_THREADS to
> 0....somewhere.

Anyone?

>
>>
>> Cheers
>>
>> Robin
>>
>> [1] https://github.com/kw/pymex
>>
>>>
>>> http://stackoverflow.com/questions/7592565/when-embedding-cpython-in-java-why-does-this-hang/7630992#7630992
>>> http://mail.scipy.org/pipermail/numpy-discussion/2009-July/044046.html
>>> Is there any fix or workaround for this?  Thanks.
>>> --
>>> Yang Zhang
>>> http://yz.mit.edu/
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>
>
>
> --
> Yang Zhang
> http://yz.mit.edu/



-- 
Yang Zhang
http://yz.mit.edu/