Change wrapping of FLINT Z/nZ polynomial gcd failure #38719
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tscrim
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Oct 4, 2024
Co-authored-by: Travis Scrimshaw <[email protected]>
Co-authored-by: Travis Scrimshaw <[email protected]>
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Sometimes FLINT fails to calculate GCDs in polynomial rings over Z/nZ. Since FLINT has no interface to report the failure, the GCD calculation needs to be wrapped and an error thrown. The present method of wrapping does not properly reactivate signals if an error happens, because the exception causes
sig_off()to never be reached. This patch rectifies that. It also adds a doctest which triggers this code path; the example is designed so that the GCD exists but FLINT fails.The error message is also adjusted, since the failure condition is more complicated than just encountering non-invertible elements (e.g., in Z/6,
gcd(2*x, x)will work).