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|
# mode: run
import gc
cdef class nontrivial_del:
def __init__(self):
print("init")
def __del__(self):
print("del")
def test_del():
"""
>>> test_del()
start
init
del
finish
"""
print("start")
d = nontrivial_del()
d = None
gc.collect()
print("finish")
cdef class del_and_dealloc:
def __init__(self):
print("init")
def __del__(self):
print("del")
def __dealloc__(self):
print("dealloc")
def test_del_and_dealloc():
"""
>>> test_del_and_dealloc()
start
init
del
dealloc
finish
"""
print("start")
d = del_and_dealloc()
d = None
gc.collect()
print("finish")
cdef class del_with_exception:
def __init__(self):
print("init")
def __del__(self):
print("del")
raise Exception("Error")
def test_del_with_exception():
"""
>>> test_del_with_exception()
start
init
del
finish
"""
print("start")
d = nontrivial_del()
d = None
gc.collect()
print("finish")
def test_nontrivial_del_with_exception():
"""
>>> test_nontrivial_del_with_exception()
start
init
del
end
"""
print("start")
def inner():
c = nontrivial_del()
raise RuntimeError()
try:
inner()
except RuntimeError:
pass
print("end")
cdef class parent:
def __del__(self):
print("del parent")
class child(parent):
def __del__(self):
print("del child")
def test_del_inheritance():
"""
>>> test_del_inheritance()
start
del child
finish
"""
print("start")
c = child()
c = None
gc.collect()
print("finish")
cdef class cy_parent:
def __del__(self):
print("del cy_parent")
def __dealloc__(self):
print("dealloc cy_parent")
class py_parent:
def __del__(self):
print("del py_parent")
class multi_child(cy_parent, py_parent):
def __del__(self):
print("del child")
def test_multiple_inheritance():
"""
>>> test_multiple_inheritance()
start
del child
dealloc cy_parent
finish
"""
print("start")
c = multi_child()
c = None
gc.collect()
print("finish")
cdef class zombie_object:
def __del__(self):
global global_zombie_object
print("del")
global_zombie_object = self
def __dealloc__(self):
print("dealloc")
def test_zombie_object():
"""
>>> test_zombie_object()
start
del
del global
del
finish
"""
global global_zombie_object
print("start")
i = zombie_object()
i = None
print("del global")
del global_zombie_object
gc.collect()
print("finish")
# Same as above, but the member
# makes the class GC, so it
# is deallocated
cdef class gc_zombie_object:
cdef object x
def __del__(self):
global global_gc_zombie_object
print("del")
global_gc_zombie_object = self
def __dealloc__(self):
print("dealloc")
def test_gc_zombie_object():
"""
>>> test_gc_zombie_object()
start
del
del global
dealloc
finish
"""
global global_gc_zombie_object
print("start")
i = gc_zombie_object()
i = None
print("del global")
del global_gc_zombie_object
gc.collect()
print("finish")
cdef class cdef_parent:
pass
cdef class cdef_child(cdef_parent):
def __del__(self):
print("del")
def __dealloc__(self):
print("dealloc")
def test_cdef_parent_object():
"""
>>> test_cdef_parent_object()
start
del
dealloc
finish
"""
print("start")
i = cdef_child()
i = None
gc.collect()
print("finish")
cdef class cdef_nontrivial_parent:
def __del__(self):
print("del parent")
def __dealloc__(self):
print("dealloc parent")
cdef class cdef_nontrivial_child(cdef_nontrivial_parent):
def __del__(self):
print("del child")
def __dealloc__(self):
print("dealloc child")
def test_cdef_nontrivial_parent_object():
"""
>>> test_cdef_nontrivial_parent_object()
start
del child
dealloc child
dealloc parent
finish
"""
print("start")
i = cdef_nontrivial_child()
i = None
gc.collect()
print("finish")
class python_child(cdef_nontrivial_parent):
def __del__(self):
print("del python child")
super().__del__()
def test_python_child_object():
"""
>>> test_python_child_object()
Traceback (most recent call last):
...
RuntimeError: End function
"""
def func(tp):
inst = tp()
raise RuntimeError("End function")
func(python_child)
def test_python_child_fancy_inherit():
"""
>>> test_python_child_fancy_inherit()
Traceback (most recent call last):
...
RuntimeError: End function
"""
# inherit using "true python" rather than Cython
globs = { 'cdef_nontrivial_parent': cdef_nontrivial_parent }
exec("""
class derived_python_child(cdef_nontrivial_parent):
pass
""", globs)
derived_python_child = globs['derived_python_child']
def func(tp):
inst = tp()
raise RuntimeError("End function")
func(derived_python_child)
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