C++ PyObject_ClearWeakRefs函数代码示例

static void __Pyx_Generator_dealloc(PyObject *self) {
    __pyx_GeneratorObject *gen = (__pyx_GeneratorObject *) self;

    PyObject_GC_UnTrack(gen);
    if (gen->gi_weakreflist != NULL)
        PyObject_ClearWeakRefs(self);

    if (gen->resume_label > 0) {
        // Generator is paused, so we need to close
        PyObject_GC_Track(self);
#if PY_VERSION_HEX >= 0x030400a1
        if (PyObject_CallFinalizerFromDealloc(self))
#else
        Py_TYPE(gen)->tp_del(self);
        if (self->ob_refcnt > 0)
#endif
        {
            // resurrected.  :(
            return;
        }
        PyObject_GC_UnTrack(self);
    }

    __Pyx_Generator_clear(self);
    PyObject_GC_Del(gen);
}

static void
mmap_object_dealloc(mmap_object *m_obj)
{
#ifdef MS_WINDOWS
    if (m_obj->data != NULL)
        UnmapViewOfFile (m_obj->data);
    if (m_obj->map_handle != NULL)
        CloseHandle (m_obj->map_handle);
    if (m_obj->file_handle != INVALID_HANDLE_VALUE)
        CloseHandle (m_obj->file_handle);
    if (m_obj->tagname)
        PyMem_Free(m_obj->tagname);
#endif /* MS_WINDOWS */

#ifdef UNIX
    if (m_obj->fd >= 0)
        (void) close(m_obj->fd);
    if (m_obj->data!=NULL) {
        munmap(m_obj->data, m_obj->size);
    }
#endif /* UNIX */

    if (m_obj->weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject *) m_obj);
    Py_TYPE(m_obj)->tp_free((PyObject*)m_obj);
}

static void
code_dealloc(PyCodeObject *co)
{
    if (co->co_extra != NULL) {
        PyInterpreterState *interp = PyThreadState_Get()->interp;
        _PyCodeObjectExtra *co_extra = co->co_extra;

        for (Py_ssize_t i = 0; i < co_extra->ce_size; i++) {
            freefunc free_extra = interp->co_extra_freefuncs[i];

            if (free_extra != NULL) {
                free_extra(co_extra->ce_extras[i]);
            }
        }

        PyMem_Free(co_extra);
    }

    Py_XDECREF(co->co_code);
    Py_XDECREF(co->co_consts);
    Py_XDECREF(co->co_names);
    Py_XDECREF(co->co_varnames);
    Py_XDECREF(co->co_freevars);
    Py_XDECREF(co->co_cellvars);
    Py_XDECREF(co->co_filename);
    Py_XDECREF(co->co_name);
    Py_XDECREF(co->co_lnotab);
    if (co->co_cell2arg != NULL)
        PyMem_FREE(co->co_cell2arg);
    if (co->co_zombieframe != NULL)
        PyObject_GC_Del(co->co_zombieframe);
    if (co->co_weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject*)co);
    PyObject_DEL(co);
}

static int Params_clear(ParamsObject *self) {
    if (self->weakreflist != NULL) {
        PyObject_ClearWeakRefs((PyObject*)self);
    }
    Py_CLEAR(self->py_lp);
    return 0;
}

static void
connection_dealloc(PyObject* obj)
{
    connectionObject *self = (connectionObject *)obj;

    /* Make sure to untrack the connection before calling conn_close, which may
     * allow a different thread to try and dealloc the connection again,
     * resulting in a double-free segfault (ticket #166). */
    PyObject_GC_UnTrack(self);

    conn_close(self);

    if (self->weakreflist) {
        PyObject_ClearWeakRefs(obj);
    }

    conn_notice_clean(self);

    PyMem_Free(self->dsn);
    PyMem_Free(self->encoding);
    if (self->critical) free(self->critical);
    if (self->cancel) PQfreeCancel(self->cancel);

    connection_clear(self);

    pthread_mutex_destroy(&(self->lock));

    Dprintf("connection_dealloc: deleted connection object at %p, refcnt = "
        FORMAT_CODE_PY_SSIZE_T,
        obj, Py_REFCNT(obj)
      );

    Py_TYPE(obj)->tp_free(obj);
}

static void
Handle_tp_dealloc(Handle *self)
{
    ASSERT(self->uv_handle);
    if (self->initialized && !uv_is_closing(self->uv_handle)) {
        uv_close(self->uv_handle, on_handle_dealloc_close);
        ASSERT(uv_is_closing(self->uv_handle));
        /* resurrect the Python object until the close callback is called */
        Py_INCREF(self);
        resurrect_object((PyObject *)self);
        return;
    } else {
        /* There are a few cases why the code will take this path:
         *   - A subclass of a handle didn't call it's parent's __init__
         *   - Aclosed handle is deallocated. Refcount is increased in close(),
         *     so it's guaranteed that if we arrived here and the user had called close(),
         *     the callback was already executed.
         *  - A handle goes out of scope and it's closed here in tp_dealloc and resurrected.
         *    Once it's deallocated again it will take this path because the handle is now
         *    closed.
         */
        ;
    }
    if (self->weakreflist != NULL) {
        PyObject_ClearWeakRefs((PyObject *)self);
    }
    Py_TYPE(self)->tp_clear((PyObject *)self);
    Py_TYPE(self)->tp_free((PyObject *)self);
}

/**
 * \param self A PyObjectPlus_Proxy
 */
void PyObjectPlus::py_base_dealloc(PyObject *self)				// python wrapper
{
#ifdef USE_WEAKREFS
	if (BGE_PROXY_WKREF(self) != NULL)
		PyObject_ClearWeakRefs((PyObject *) self);
#endif

	if (BGE_PROXY_PYREF(self)) {
		PyObjectPlus *self_plus= BGE_PROXY_REF(self);
		if (self_plus) {
			if (BGE_PROXY_PYOWNS(self)) { /* Does python own this?, then delete it  */
				self_plus->m_proxy = NULL; /* Need this to stop ~PyObjectPlus from decrefing m_proxy otherwise its decref'd twice and py-debug crashes */
				delete self_plus;
			}
			BGE_PROXY_REF(self)= NULL; // not really needed
		}
		// the generic pointer is not deleted directly, only through self_plus
		BGE_PROXY_PTR(self)= NULL; // not really needed
	} else {
		void *ptr= BGE_PROXY_PTR(self);
		if (ptr) {
			if (BGE_PROXY_PYOWNS(self)) { /* Does python own this?, then delete it  */
				// generic structure owned by python MUST be created though MEM_alloc
				MEM_freeN(ptr);
			}
			BGE_PROXY_PTR(self)= NULL; // not really needed
		}
	}
#if 0
	/* is ok normally but not for subtyping, use tp_free instead. */
	PyObject_DEL( self );
#else
	Py_TYPE(self)->tp_free(self);
#endif
};

static void
tasklet_dealloc(PyTaskletObject *t)
{
    if (tasklet_has_c_stack(t)) {
        /*
         * we want to cleanly kill the tasklet in the case it
         * was forgotten. One way would be to resurrect it,
         * but this is quite ugly with many ifdefs, see
         * classobject/typeobject.
         * Well, we do it.
         */
        if (slp_resurrect_and_kill((PyObject *) t, kill_finally)) {
            /* the beast has grown new references */
            return;
        }
    }

    tasklet_clear_frames(t);
    if (t->tsk_weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject *)t);
    if (t->cstate != NULL) {
        assert(t->cstate->task != t || t->cstate->ob_size == 0);
        Py_DECREF(t->cstate);
    }
    Py_DECREF(t->tempval);
    Py_XDECREF(t->def_globals);
    t->ob_type->tp_free((PyObject*)t);
}

void WeakSet_dealloc(WeakSet *self){
    if (self->in_weakreflist != NULL)
            PyObject_ClearWeakRefs((PyObject *) self);
    Py_XDECREF(self->set);
    Py_XDECREF(self->selfref);
    self->ob_type->tp_free((PyObject*)self);
}

static int sllist_clear_refs(SLListObject* self)
{
    PyObject* node = self->first;

    if (self->weakref_list != NULL)
        PyObject_ClearWeakRefs((PyObject*)self);

    self->first = NULL;
    self->last = NULL;
    self->weakref_list = NULL;

    if (node != NULL)
    {
        while (node != Py_None)
        {
            PyObject* next_node = ((SLListNodeObject*)node)->next;
            ((SLListNodeObject*)node)->next = Py_None;
            Py_DECREF(node);
            node = next_node;
        }
    }

    Py_DECREF(Py_None);

    return 0;
}

static int Bar_clear(BarObject *self) {
  if (self->weakreflist != NULL) {
    PyObject_ClearWeakRefs((PyObject*)self);
  }
  Py_CLEAR(self->py_bc);
  return 0;
}

static void
__Pyx_Generator_dealloc(PyObject *self)
{
    __pyx_GeneratorObject *gen = (__pyx_GeneratorObject *) self;

    PyObject_GC_UnTrack(gen);
    if (gen->gi_weakreflist != NULL)
        PyObject_ClearWeakRefs(self);
    PyObject_GC_Track(self);

    if (gen->resume_label > 0) {
        /* Generator is paused, so we need to close */
        Py_TYPE(gen)->tp_del(self);
        if (self->ob_refcnt > 0)
            return;                     /* resurrected.  :( */
    }

    PyObject_GC_UnTrack(self);
    Py_CLEAR(gen->closure);
    Py_CLEAR(gen->classobj);
    Py_CLEAR(gen->exc_type);
    Py_CLEAR(gen->exc_value);
    Py_CLEAR(gen->exc_traceback);
    PyObject_GC_Del(gen);
}

static void compose_dealloc(PyComposeObject* self) {
    PyObject_GC_UnTrack(self);

    if(self->weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject*)self);

    compose_clear(self);
    PyObject_GC_Del(self);
}

static void
eConsolePy_dealloc(eConsolePy* self)
{
	if (self->in_weakreflist != NULL)
		PyObject_ClearWeakRefs((PyObject *) self);
	eConsolePy_clear(self);
	self->cont->Release();
	self->ob_type->tp_free((PyObject*)self);
}

static void
dbgbp_dealloc(PyDebugBreakpointObject *self)
{
    if (self->weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject *)self);
    if (self->bp)
        self->bp = NULL;
    Py_TYPE(self)->tp_free((PyObject *)self);
}