好的,在使用 Cython 的 C++ 支持后,我遇到了一个奇怪的错误,因为我认为 manual advises (使用 __cinit__
分配堆 RAM 并使用 __dealloc__
再次释放它。
我有一个 C++ 类,它在其构造函数中calloc
和 malloc
一些 RAM,并在析构函数中释放
它。如有必要,我会发布这个,但错误不是来自 C++ 领域,new
和 delete
调用工作正常,所以我只给你 cython现在:
cdef extern from "../clibs/adjacency.hpp":
cdef cppclass Adjacency:
int* _bv
void** _meta
unsigned int length
Adjacency(int graph_order, int meta_on)
int get(int i, int j)
void set(int i, int j, int on, void* meta)
void reset_to_zero()
void edges_iter(void* global_meta, void (*callback)(void*, int, int, void*))
cdef class Graph:
cdef Adjacency* adj
def __init__(self, graph_order):
print "__init__"
def __cinit__(self, graph_order, *args, **kwargs):
print "__cinit__"
print "allocating, no meta."
self.adj = new Adjacency(<int>graph_order, 0)
def __dealloc__(self):
print "__dealloc__"
del self.adj
当我测试这个时,我得到以下信息:
In [1]: import graph
In [2]: g = graph.Graph(302)
__cinit__
allocating, no meta.
__init__
In [3]: ^D
Do you really want to exit ([y]/n)?
__dealloc__
Python(7389,0x7fff70f9acc0) malloc: *** error for object 0x100defa08: incorrect
checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Abort trap
我有时也会遇到段错误而不是错误的校验和。
我破解了 cython 生成的 C++ 文件并在 delete
调用周围添加了以下内容:
/* "graph.pyx":75
* def __dealloc__(self):
* print "__dealloc__"
* del self.adj # <<<<<<<<<<<<<<
*
* def __init__(self, graph_order):
*/
printf("about to delete adj:\n");
delete __pyx_v_self->adj;
printf("just deleted adj!\n");
我们可以清楚地看到我对 delete
的调用运行良好:
In [1]: import graph
In [2]: g = graph.Graph(302)
__cinit__
allocating, no meta.
__init__
In [3]: ^D
Do you really want to exit ([y]/n)?
__dealloc__
about to delete adj:
just deleted adj!
Python(7389,0x7fff70f9acc0) malloc: *** error for object 0x100defa08: incorrect
checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Abort trap
在我按照 Cython 手册中的指示完成整理后,Python 发脾气。
我还尝试在 __dealloc__
中设置 self.adj = NULL
,以防 Python 试图查看我的对象内部,但这没有帮助。
知道我做错了什么吗?
最佳答案
我在我的 C++ 代码中犯了一个错误(我没有显示)。
我有一堆这样的函数:
if (_meta != NULL) {
// do stuff with _meta, like loop over the void*s
}
但是在构造函数中,我在设置 _meta = NULL;
之前调用了其中一个 ...
关于c++ - Cython 扩展类 : "incorrect checksum for freed object" after __dealloc__ method,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14115121/