Opened 6 years ago
Last modified 5 years ago
#20360 new enhancement
Add sig_on/sig_off to COINBackend
Reported by: | mkoeppe | Owned by: | |
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Priority: | major | Milestone: | sage-7.2 |
Component: | numerical | Keywords: | lp |
Cc: | dimpase, vdelecroix, jdemeyer | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
The COIN backend needs sig_on
, sig_off
throughout so that bounds errors do not crash Sage.
sage: p = get_solver(solver = "Coin") sage: p.is_variable_continuous(1234567) True sage: p.add_linear_constraint([(123, 456.7)], None, 0) ... Unhandled SIGSEGV: A segmentation fault occurred.
Another one, from #20326:
sage: coeffs = ([0, vector([1, 2])], [1, vector([2, 3])]) sage: upper = vector([5, 5]) sage: lower = vector([0, 0]) sage: from sage.numerical.backends.generic_backend import get_solver sage: p = get_solver(solver = "Coin") # optional - cbc sage: p.add_linear_constraint_vector(2, coeffs, lower, upper)
Change History (3)
comment:1 Changed 6 years ago by
- Description modified (diff)
comment:2 follow-up: ↓ 3 Changed 5 years ago by
comment:3 in reply to: ↑ 2 Changed 5 years ago by
Replying to jdemeyer:
I don't think this is a matter of adding
sig_on
/sig_off
. Letting a program segfault and then catching the segfault is not a proper way of handling errors.You should just check invalid input before calling COIN.
IMHO it's rather the backend's task (and that's more pythonic, if you ask me). They should check for such things, and perhaps they will fix it at some point.
That being said, it might still be a good idea to add the
sig_on
/sig_off
but not as a substitute for input checking.
I don't think this is a matter of adding
sig_on
/sig_off
. Letting a program segfault and then catching the segfault is not a proper way of handling errors.You should just check invalid input before calling COIN.
That being said, it might still be a good idea to add the
sig_on
/sig_off
but not as a substitute for input checking.