#13447: Make libsingular multivariate polynomial rings collectable
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Reporter: nbruin |
Owner: rlm
Type: defect |
Status: needs_review
Priority: major |
Milestone: sage-5.4
Component: memleak |
Resolution:
Keywords: | Work
issues: Input from a libsingular expert
Report Upstream: None of the above - read trac for reasoning. |
Reviewers: Simon King
Authors: Nils Bruin, Simon King | Merged
in:
Dependencies: #11521 |
Stopgaps:
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Comment (by SimonKing):
Now I think I understand:
`currRingHdl = enterid("my_awesome_sage_ring", 0, RING_CMD, &IDROOT, 1)`
has the purpose to create `currRingHdl` (it is only called if
`currRingHdl==NULL`), but the value assigned to `currRingHdl.data.uring`
is ''invalid''. In particular, the attempt to change to
`currRingHdl.data.uring` results in a segfault. Hence,
`singular_ring_delete(currRingHdl.data.uring)` would not work.
Solution: We create `currRingHdl`, but we immediately delete the invalid
`currRingHdl.data.uring` and replace it by a new reference to `currRing`.
If there is no `currRing` then I print a warning, but I hope that we will
never see that warning...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13447#comment:47>
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