[Numpy-discussion] CAPI segfault running python embedded

Lane Brooks lbrooks@MIT....
Fri Jun 20 08:30:33 CDT 2008

David Cournapeau wrote:
> Lane Brooks wrote:
>> I have successfully written several extension modules that use the numpy 
>> CAPI to manipulate numpy arrays.  I have to say numpy is great.
>> I am now having a problem, however, when calling numpy capi functions 
>> when running python embedded in a third party, closed source, 
>> application.  It segfaults whenever I make any PyArray* function call.  
>> Any ideas on why that might be happening?
> You most likely forgot to call import_array functions when initializing 
> your extension (the PyMODULE_INIT function): with python, extensions 
> which define new C-API does it through an array of function pointers, 
> which is garbage before you call import_array. I have never used 
> embedded python, so I don't know how initialization works there, but 
> that should be similar I guess.
> cheers,
> David
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Your exactly right.  I was side-tracked by the fact that this was 
embedded python (which is not really that different) and thought was 
thinking it was an environmental condition.  Adding the import_array() 
cleared the problem up immediately.  Thanks for the help.


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