On 2017-09-08 14:55, Simon King wrote:
sage: cython(""" ....: #!clib gap ....: from sage.libs.gap.gap_includes cimport * ....: from sage.libs.gap.element cimport GapElement_FiniteField ....: from sage.libs.gap.libgap import libgap ....: def test(x): ....: libgap_enter() ....: cdef GapElement_FiniteField y = libgap(x) ....: libgap_exit() ....: """) sage: test(GF(2).zero())The above crashes. When I move libgap_enter() one line down, it works.
As others have said, this is not calling the libGAP C API. So the call libgap(x) *also* does libgap_enter(). So you are nesting two calls to libgap_enter(), which is not allowed.
One could consider it a bug that this totally crashes Sage. Maybe libgap_enter() should do sig_on() and libgap_exit() should do sig_off(). That way, calling libgap_enter() twice would be an ordinary exception instead of a hard crash.
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