什么是初始化一个Python对象到现有存储器(类似于C的就地新++)Python的C-API对象初始化
我试过但是这个代码它会导致访问冲突与调试版本,因为正确的方法在_ob_prev和_ob_next没有设置..
//PyVarObject *mem; -previously allocated memory
Py_INCREF(type);
//couldnt get PyObject_HEAD_INIT or PyVarObject_HEAD_INIT to compile
//however the macros resolve to this
PyVarObject init = {{_PyObject_EXTRA_INIT 1, ((_typeobject*)type)}, 0};
*mem = init;
//...other init code for type...
的崩溃object.c
void
_Py_ForgetReference(register PyObject *op)
{
#ifdef SLOW_UNREF_CHECK
register PyObject *p;
#endif
if (op->ob_refcnt < 0)
Py_FatalError("UNREF negative refcnt");
if (op == &refchain ||
op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op) { //----HERE----//
fprintf(stderr, "* ob\n");
_PyObject_Dump(op);
fprintf(stderr, "* op->_ob_prev->_ob_next\n");
_PyObject_Dump(op->_ob_prev->_ob_next);
fprintf(stderr, "* op->_ob_next->_ob_prev\n");
_PyObject_Dump(op->_ob_next->_ob_prev);
Py_FatalError("UNREF invalid object");
}
#ifdef SLOW_UNREF_CHECK
for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
if (p == op)
break;
}
if (p == &refchain) /* Not found */
Py_FatalError("UNREF unknown object");
#endif
op->_ob_next->_ob_prev = op->_ob_prev;
op->_ob_prev->_ob_next = op->_ob_next;
op->_ob_next = op->_ob_prev = NULL;
_Py_INC_TPFREES(op);
}
refrence counting是正确的,而不是这里的问题(因此它在发布版本中工作正常的原因)。问题是,在调试构建下next和prev为空的事实似乎导致python在清理对象时崩溃,所以看起来我需要一种方法来初始化它们。 – 2009-02-26 07:31:28