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"""
Check that the @cython.no_gc decorator disables generation of the
tp_clear and tp_traverse slots, that is, disables cycle collection.
"""
cimport cython
from cpython.ref cimport PyObject, Py_TYPE
# Force non-gc'd PyTypeObject when safety is guaranteed by user but not provable
cdef extern from *:
ctypedef struct PyTypeObject:
void (*tp_clear)(object)
void (*tp_traverse)(object)
def is_tp_clear_null(obj):
return (<PyTypeObject*>Py_TYPE(obj)).tp_clear is NULL
def is_tp_traverse_null(obj):
return (<PyTypeObject*>Py_TYPE(obj)).tp_traverse is NULL
@cython.no_gc
cdef class DisableGC:
"""
An extension type that has tp_clear and tp_traverse methods generated
to test that it actually clears the references to NULL.
>>> uut = DisableGC()
>>> is_tp_clear_null(uut)
True
>>> is_tp_traverse_null(uut)
True
"""
cdef public object requires_cleanup
def __cinit__(self):
self.requires_cleanup = (
"Tuples to strings don't really need cleanup, cannot take part of cycles",)
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