#5862: [with patch, needs work] OSX 64 bit libsingular -- sage/libsingular
segfaults on first creation of a ring
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Reporter: was | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-3.4.2
Component: commutative algebra | Keywords:
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Comment(by GeorgSWeber):
Hi,
I digged around in the Mac OS X documentation, especially:
http://developer.apple.com/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryUsageGuidelines.html#//apple_ref/doc/uid/TP40001928-SW10
In the section about "Opening Dynamic Libraries" there is also something
said about closing dynamic libraries. Especially, the dynamic loader might
or might not after "dlclose()" remove the library from the applications
address space. That would be an explanation for seeing segfaults, I guess.
Now in line 168 of "multi_polynomial_libsingular.pyx", there is a call to
"dlclose()", and this call most probably is done before any ring is
instantiated. I remember to have seen a file where on Sage shutdown many
memory deallocations and such are performed, probably that call to
"dlclose()" is done better there (I don't remember what that place was).
See also trac #5522 about issues with whether libsingular was loaded or
not.
Cheers, gsw
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5862#comment:5>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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