The weak reference implementation, separated from the weakref module.
diff --git a/Objects/weakrefobject.c b/Objects/weakrefobject.c
new file mode 100644
index 0000000..56ecfb3
--- /dev/null
+++ b/Objects/weakrefobject.c
@@ -0,0 +1,715 @@
+#include "Python.h"
+#include "structmember.h"
+
+
+#define GET_WEAKREFS_LISTPTR(o) \
+ ((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
+
+static PyWeakReference *
+free_list = NULL;
+
+
+long
+_PyWeakref_GetWeakrefCount(PyWeakReference *head)
+{
+ long count = 0;
+
+ while (head != NULL) {
+ ++count;
+ head = head->wr_next;
+ }
+ return count;
+}
+
+
+static PyWeakReference *
+new_weakref(void)
+{
+ PyWeakReference *result;
+
+ if (free_list != NULL) {
+ result = free_list;
+ free_list = result->wr_next;
+ result->ob_type = &_PyWeakref_RefType;
+ _Py_NewReference((PyObject *)result);
+ }
+ else {
+ result = PyObject_GC_New(PyWeakReference, &_PyWeakref_RefType);
+ }
+ if (result)
+ result->hash = -1;
+ return result;
+}
+
+
+/* This function clears the passed-in reference and removes it from the
+ * list of weak references for the referent. This is the only code that
+ * removes an item from the doubly-linked list of weak references for an
+ * object; it is also responsible for clearing the callback slot.
+ */
+static void
+clear_weakref(PyWeakReference *self)
+{
+ PyObject *callback = self->wr_callback;
+
+ if (PyWeakref_GET_OBJECT(self) != Py_None) {
+ PyWeakReference **list = GET_WEAKREFS_LISTPTR(
+ PyWeakref_GET_OBJECT(self));
+
+ if (*list == self)
+ *list = self->wr_next;
+ self->wr_object = Py_None;
+ self->wr_callback = NULL;
+ if (self->wr_prev != NULL)
+ self->wr_prev->wr_next = self->wr_next;
+ if (self->wr_next != NULL)
+ self->wr_next->wr_prev = self->wr_prev;
+ self->wr_prev = NULL;
+ self->wr_next = NULL;
+ Py_XDECREF(callback);
+ }
+}
+
+
+static void
+weakref_dealloc(PyWeakReference *self)
+{
+ PyObject_GC_UnTrack((PyObject *)self);
+ clear_weakref(self);
+ self->wr_next = free_list;
+ free_list = self;
+}
+
+
+static int
+gc_traverse(PyWeakReference *self, visitproc visit, void *arg)
+{
+ if (self->wr_callback != NULL)
+ return visit(self->wr_callback, arg);
+ return 0;
+}
+
+
+static int
+gc_clear(PyWeakReference *self)
+{
+ clear_weakref(self);
+ return 0;
+}
+
+
+static PyObject *
+weakref_call(PyWeakReference *self, PyObject *args, PyObject *kw)
+{
+ static char *argnames[] = {NULL};
+
+ if (PyArg_ParseTupleAndKeywords(args, kw, ":__call__", argnames)) {
+ PyObject *object = PyWeakref_GET_OBJECT(self);
+ Py_INCREF(object);
+ return (object);
+ }
+ return NULL;
+}
+
+
+static long
+weakref_hash(PyWeakReference *self)
+{
+ if (self->hash != -1)
+ return self->hash;
+ if (PyWeakref_GET_OBJECT(self) == Py_None) {
+ PyErr_SetString(PyExc_TypeError, "weak object has gone away");
+ return -1;
+ }
+ self->hash = PyObject_Hash(PyWeakref_GET_OBJECT(self));
+ return self->hash;
+}
+
+
+static PyObject *
+weakref_repr(PyWeakReference *self)
+{
+ char buffer[256];
+ if (PyWeakref_GET_OBJECT(self) == Py_None) {
+ sprintf(buffer, "<weakref at %lx; dead>",
+ (long)(self));
+ }
+ else {
+ sprintf(buffer, "<weakref at %#lx; to '%s' at %#lx>",
+ (long)(self), PyWeakref_GET_OBJECT(self)->ob_type->tp_name,
+ (long)(PyWeakref_GET_OBJECT(self)));
+ }
+ return PyString_FromString(buffer);
+}
+
+/* Weak references only support equality, not ordering. Two weak references
+ are equal if the underlying objects are equal. If the underlying object has
+ gone away, they are equal if they are identical. */
+
+static PyObject *
+weakref_richcompare(PyWeakReference* self, PyWeakReference* other, int op)
+{
+ if (op != Py_EQ || self->ob_type != other->ob_type) {
+ Py_INCREF(Py_NotImplemented);
+ return Py_NotImplemented;
+ }
+ if (PyWeakref_GET_OBJECT(self) == Py_None
+ || PyWeakref_GET_OBJECT(other) == Py_None) {
+ PyObject *res = self==other ? Py_True : Py_False;
+ Py_INCREF(res);
+ return res;
+ }
+ return PyObject_RichCompare(PyWeakref_GET_OBJECT(self),
+ PyWeakref_GET_OBJECT(other), op);
+}
+
+
+PyTypeObject
+_PyWeakref_RefType = {
+ PyObject_HEAD_INIT(&PyType_Type)
+ 0,
+ "weakref",
+ sizeof(PyWeakReference),
+ 0,
+ (destructor)weakref_dealloc,/*tp_dealloc*/
+ 0, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ 0, /*tp_compare*/
+ (reprfunc)weakref_repr, /*tp_repr*/
+ 0, /*tp_as_number*/
+ 0, /*tp_as_sequence*/
+ 0, /*tp_as_mapping*/
+ (hashfunc)weakref_hash, /*tp_hash*/
+ (ternaryfunc)weakref_call, /*tp_call*/
+ 0, /*tp_str*/
+ 0, /*tp_getattro*/
+ 0, /*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_RICHCOMPARE,
+ 0, /*tp_doc*/
+ (traverseproc)gc_traverse, /*tp_traverse*/
+ (inquiry)gc_clear, /*tp_clear*/
+ (richcmpfunc)weakref_richcompare, /*tp_richcompare*/
+ 0, /*tp_weaklistoffset*/
+};
+
+
+static int
+proxy_checkref(PyWeakReference *proxy)
+{
+ if (PyWeakref_GET_OBJECT(proxy) == Py_None) {
+ PyErr_SetString(PyExc_ReferenceError,
+ "weakly-referenced object no longer exists");
+ return 0;
+ }
+ return 1;
+}
+
+
+#define WRAP_UNARY(method, generic) \
+ static PyObject * \
+ method(PyWeakReference *proxy) { \
+ if (!proxy_checkref(proxy)) { \
+ return NULL; \
+ } \
+ return generic(PyWeakref_GET_OBJECT(proxy)); \
+ }
+
+#define WRAP_BINARY(method, generic) \
+ static PyObject * \
+ method(PyWeakReference *proxy, PyObject *v) { \
+ if (!proxy_checkref(proxy)) { \
+ return NULL; \
+ } \
+ return generic(PyWeakref_GET_OBJECT(proxy), v); \
+ }
+
+#define WRAP_TERNARY(method, generic) \
+ static PyObject * \
+ method(PyWeakReference *proxy, PyObject *v, PyObject *w) { \
+ if (!proxy_checkref(proxy)) { \
+ return NULL; \
+ } \
+ return generic(PyWeakref_GET_OBJECT(proxy), v, w); \
+ }
+
+
+/* direct slots */
+
+WRAP_BINARY(proxy_getattr, PyObject_GetAttr)
+WRAP_UNARY(proxy_str, PyObject_Str)
+WRAP_TERNARY(proxy_call, PyEval_CallObjectWithKeywords)
+
+static int
+proxy_print(PyWeakReference *proxy, FILE *fp, int flags)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PyObject_Print(PyWeakref_GET_OBJECT(proxy), fp, flags);
+}
+
+static PyObject *
+proxy_repr(PyWeakReference *proxy)
+{
+ char buf[160];
+ sprintf(buf, "<weakref at %p to %.100s at %p>", proxy,
+ PyWeakref_GET_OBJECT(proxy)->ob_type->tp_name,
+ PyWeakref_GET_OBJECT(proxy));
+ return PyString_FromString(buf);
+}
+
+
+static int
+proxy_setattr(PyWeakReference *proxy, PyObject *name, PyObject *value)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PyObject_SetAttr(PyWeakref_GET_OBJECT(proxy), name, value);
+}
+
+static int
+proxy_compare(PyWeakReference *proxy, PyObject *v)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PyObject_Compare(PyWeakref_GET_OBJECT(proxy), v);
+}
+
+/* number slots */
+WRAP_BINARY(proxy_add, PyNumber_Add)
+WRAP_BINARY(proxy_sub, PyNumber_Subtract)
+WRAP_BINARY(proxy_mul, PyNumber_Multiply)
+WRAP_BINARY(proxy_div, PyNumber_Divide)
+WRAP_BINARY(proxy_mod, PyNumber_Remainder)
+WRAP_BINARY(proxy_divmod, PyNumber_Divmod)
+WRAP_TERNARY(proxy_pow, PyNumber_Power)
+WRAP_UNARY(proxy_neg, PyNumber_Negative)
+WRAP_UNARY(proxy_pos, PyNumber_Positive)
+WRAP_UNARY(proxy_abs, PyNumber_Absolute)
+WRAP_UNARY(proxy_invert, PyNumber_Invert)
+WRAP_BINARY(proxy_lshift, PyNumber_Lshift)
+WRAP_BINARY(proxy_rshift, PyNumber_Rshift)
+WRAP_BINARY(proxy_and, PyNumber_And)
+WRAP_BINARY(proxy_xor, PyNumber_Xor)
+WRAP_BINARY(proxy_or, PyNumber_Or)
+WRAP_UNARY(proxy_int, PyNumber_Int)
+WRAP_UNARY(proxy_long, PyNumber_Long)
+WRAP_UNARY(proxy_float, PyNumber_Float)
+WRAP_BINARY(proxy_iadd, PyNumber_InPlaceAdd)
+WRAP_BINARY(proxy_isub, PyNumber_InPlaceSubtract)
+WRAP_BINARY(proxy_imul, PyNumber_InPlaceMultiply)
+WRAP_BINARY(proxy_idiv, PyNumber_InPlaceDivide)
+WRAP_BINARY(proxy_imod, PyNumber_InPlaceRemainder)
+WRAP_TERNARY(proxy_ipow, PyNumber_InPlacePower)
+WRAP_BINARY(proxy_ilshift, PyNumber_InPlaceLshift)
+WRAP_BINARY(proxy_irshift, PyNumber_InPlaceRshift)
+WRAP_BINARY(proxy_iand, PyNumber_InPlaceAnd)
+WRAP_BINARY(proxy_ixor, PyNumber_InPlaceXor)
+WRAP_BINARY(proxy_ior, PyNumber_InPlaceOr)
+
+static int
+proxy_nonzero(PyWeakReference *proxy)
+{
+ PyObject *o = PyWeakref_GET_OBJECT(proxy);
+ if (!proxy_checkref(proxy))
+ return 1;
+ if (o->ob_type->tp_as_number &&
+ o->ob_type->tp_as_number->nb_nonzero)
+ return (*o->ob_type->tp_as_number->nb_nonzero)(o);
+ else
+ return 1;
+}
+
+/* sequence slots */
+
+static PyObject *
+proxy_slice(PyWeakReference *proxy, int i, int j)
+{
+ if (!proxy_checkref(proxy))
+ return NULL;
+ return PySequence_GetSlice(PyWeakref_GET_OBJECT(proxy), i, j);
+}
+
+static int
+proxy_ass_slice(PyWeakReference *proxy, int i, int j, PyObject *value)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PySequence_SetSlice(PyWeakref_GET_OBJECT(proxy), i, j, value);
+}
+
+static int
+proxy_contains(PyWeakReference *proxy, PyObject *value)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PySequence_Contains(PyWeakref_GET_OBJECT(proxy), value);
+}
+
+
+/* mapping slots */
+
+static int
+proxy_length(PyWeakReference *proxy)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PyObject_Length(PyWeakref_GET_OBJECT(proxy));
+}
+
+WRAP_BINARY(proxy_getitem, PyObject_GetItem)
+
+static int
+proxy_setitem(PyWeakReference *proxy, PyObject *key, PyObject *value)
+{
+ if (!proxy_checkref(proxy))
+ return -1;
+ return PyObject_SetItem(PyWeakref_GET_OBJECT(proxy), key, value);
+}
+
+
+static PyNumberMethods proxy_as_number = {
+ (binaryfunc)proxy_add, /*nb_add*/
+ (binaryfunc)proxy_sub, /*nb_subtract*/
+ (binaryfunc)proxy_mul, /*nb_multiply*/
+ (binaryfunc)proxy_div, /*nb_divide*/
+ (binaryfunc)proxy_mod, /*nb_remainder*/
+ (binaryfunc)proxy_divmod, /*nb_divmod*/
+ (ternaryfunc)proxy_pow, /*nb_power*/
+ (unaryfunc)proxy_neg, /*nb_negative*/
+ (unaryfunc)proxy_pos, /*nb_positive*/
+ (unaryfunc)proxy_abs, /*nb_absolute*/
+ (inquiry)proxy_nonzero, /*nb_nonzero*/
+ (unaryfunc)proxy_invert, /*nb_invert*/
+ (binaryfunc)proxy_lshift, /*nb_lshift*/
+ (binaryfunc)proxy_rshift, /*nb_rshift*/
+ (binaryfunc)proxy_and, /*nb_and*/
+ (binaryfunc)proxy_xor, /*nb_xor*/
+ (binaryfunc)proxy_or, /*nb_or*/
+ (coercion)0, /*nb_coerce*/
+ (unaryfunc)proxy_int, /*nb_int*/
+ (unaryfunc)proxy_long, /*nb_long*/
+ (unaryfunc)proxy_float, /*nb_float*/
+ (unaryfunc)0, /*nb_oct*/
+ (unaryfunc)0, /*nb_hex*/
+ (binaryfunc)proxy_iadd, /*nb_inplace_add*/
+ (binaryfunc)proxy_isub, /*nb_inplace_subtract*/
+ (binaryfunc)proxy_imul, /*nb_inplace_multiply*/
+ (binaryfunc)proxy_idiv, /*nb_inplace_divide*/
+ (binaryfunc)proxy_imod, /*nb_inplace_remainder*/
+ (ternaryfunc)proxy_ipow, /*nb_inplace_power*/
+ (binaryfunc)proxy_ilshift, /*nb_inplace_lshift*/
+ (binaryfunc)proxy_irshift, /*nb_inplace_rshift*/
+ (binaryfunc)proxy_iand, /*nb_inplace_and*/
+ (binaryfunc)proxy_ixor, /*nb_inplace_xor*/
+ (binaryfunc)proxy_ior, /*nb_inplace_or*/
+};
+
+static PySequenceMethods proxy_as_sequence = {
+ (inquiry)proxy_length, /*sq_length*/
+ 0, /*sq_concat*/
+ 0, /*sq_repeat*/
+ 0, /*sq_item*/
+ (intintargfunc)proxy_slice, /*sq_slice*/
+ 0, /*sq_ass_item*/
+ (intintobjargproc)proxy_ass_slice, /*sq_ass_slice*/
+ (objobjproc)proxy_contains, /* sq_contains */
+};
+
+static PyMappingMethods proxy_as_mapping = {
+ (inquiry)proxy_length, /*mp_length*/
+ (binaryfunc)proxy_getitem, /*mp_subscript*/
+ (objobjargproc)proxy_setitem, /*mp_ass_subscript*/
+};
+
+
+PyTypeObject
+_PyWeakref_ProxyType = {
+ PyObject_HEAD_INIT(&PyType_Type)
+ 0,
+ "weakproxy",
+ sizeof(PyWeakReference),
+ 0,
+ /* methods */
+ (destructor)weakref_dealloc,/*tp_dealloc*/
+ (printfunc)proxy_print, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ (cmpfunc)proxy_compare, /*tp_compare*/
+ (unaryfunc)proxy_repr, /*tp_repr*/
+ &proxy_as_number, /*tp_as_number*/
+ &proxy_as_sequence, /*tp_as_sequence*/
+ &proxy_as_mapping, /*tp_as_mapping*/
+ 0, /*tp_hash*/
+ (ternaryfunc)0, /*tp_call*/
+ (unaryfunc)proxy_str, /*tp_str*/
+ (getattrofunc)proxy_getattr,/*tp_getattro*/
+ (setattrofunc)proxy_setattr,/*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC
+ |Py_TPFLAGS_CHECKTYPES, /*tp_flags*/
+ 0, /*tp_doc*/
+ (traverseproc)gc_traverse, /*tp_traverse*/
+ (inquiry)gc_clear, /*tp_clear*/
+};
+
+
+PyTypeObject
+_PyWeakref_CallableProxyType = {
+ PyObject_HEAD_INIT(&PyType_Type)
+ 0,
+ "weakcallableproxy",
+ sizeof(PyWeakReference),
+ 0,
+ /* methods */
+ (destructor)weakref_dealloc,/*tp_dealloc*/
+ (printfunc)proxy_print, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ (cmpfunc)proxy_compare, /*tp_compare*/
+ (unaryfunc)proxy_repr, /*tp_repr*/
+ &proxy_as_number, /*tp_as_number*/
+ &proxy_as_sequence, /*tp_as_sequence*/
+ &proxy_as_mapping, /*tp_as_mapping*/
+ 0, /*tp_hash*/
+ (ternaryfunc)proxy_call, /*tp_call*/
+ (unaryfunc)proxy_str, /*tp_str*/
+ (getattrofunc)proxy_getattr,/*tp_getattro*/
+ (setattrofunc)proxy_setattr,/*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC
+ |Py_TPFLAGS_CHECKTYPES, /*tp_flags*/
+ 0, /*tp_doc*/
+ (traverseproc)gc_traverse, /*tp_traverse*/
+ (inquiry)gc_clear, /*tp_clear*/
+};
+
+
+/* Given the head of an object's list of weak references, extract the
+ * two callback-less refs (ref and proxy). Used to determine if the
+ * shared references exist and to determine the back link for newly
+ * inserted references.
+ */
+static void
+get_basic_refs(PyWeakReference *head,
+ PyWeakReference **refp, PyWeakReference **proxyp)
+{
+ *refp = NULL;
+ *proxyp = NULL;
+
+ if (head != NULL && head->wr_callback == NULL) {
+ if (head->ob_type == &_PyWeakref_RefType) {
+ *refp = head;
+ head = head->wr_next;
+ }
+ if (head != NULL && head->wr_callback == NULL) {
+ *proxyp = head;
+ head = head->wr_next;
+ }
+ }
+}
+
+/* Insert 'newref' in the list after 'prev'. Both must be non-NULL. */
+static void
+insert_after(PyWeakReference *newref, PyWeakReference *prev)
+{
+ newref->wr_prev = prev;
+ newref->wr_next = prev->wr_next;
+ if (prev->wr_next != NULL)
+ prev->wr_next->wr_prev = newref;
+ prev->wr_next = newref;
+}
+
+/* Insert 'newref' at the head of the list; 'list' points to the variable
+ * that stores the head.
+ */
+static void
+insert_head(PyWeakReference *newref, PyWeakReference **list)
+{
+ PyWeakReference *next = *list;
+
+ newref->wr_prev = NULL;
+ newref->wr_next = next;
+ if (next != NULL)
+ next->wr_prev = newref;
+ *list = newref;
+}
+
+
+PyObject *
+PyWeakref_NewRef(PyObject *ob, PyObject *callback)
+{
+ PyWeakReference *result = NULL;
+ PyWeakReference **list;
+ PyWeakReference *ref, *proxy;
+
+ if (!PyType_SUPPORTS_WEAKREFS(ob->ob_type)) {
+ PyErr_Format(PyExc_TypeError,
+ "'%s' objects are not weakly referencable",
+ ob->ob_type->tp_name);
+ return NULL;
+ }
+ list = GET_WEAKREFS_LISTPTR(ob);
+ get_basic_refs(*list, &ref, &proxy);
+ if (callback == NULL || callback == Py_None)
+ /* return existing weak reference if it exists */
+ result = ref;
+ if (result != NULL)
+ Py_XINCREF(result);
+ else {
+ result = new_weakref();
+ if (result != NULL) {
+ Py_XINCREF(callback);
+ result->wr_callback = callback;
+ result->wr_object = ob;
+ if (callback == NULL) {
+ insert_head(result, list);
+ }
+ else {
+ PyWeakReference *prev = (proxy == NULL) ? ref : proxy;
+
+ if (prev == NULL)
+ insert_head(result, list);
+ else
+ insert_after(result, prev);
+ }
+ PyObject_GC_Track(result);
+ }
+ }
+ return (PyObject *) result;
+}
+
+
+PyObject *
+PyWeakref_NewProxy(PyObject *ob, PyObject *callback)
+{
+ PyWeakReference *result = NULL;
+ PyWeakReference **list;
+ PyWeakReference *ref, *proxy;
+
+ if (!PyType_SUPPORTS_WEAKREFS(ob->ob_type)) {
+ PyErr_Format(PyExc_TypeError,
+ "'%s' objects are not weakly referencable",
+ ob->ob_type->tp_name);
+ return NULL;
+ }
+ list = GET_WEAKREFS_LISTPTR(ob);
+ get_basic_refs(*list, &ref, &proxy);
+ if (callback == NULL)
+ /* attempt to return an existing weak reference if it exists */
+ result = proxy;
+ if (result != NULL)
+ Py_XINCREF(result);
+ else {
+ result = new_weakref();
+ if (result != NULL) {
+ PyWeakReference *prev;
+
+ if (PyCallable_Check(ob))
+ result->ob_type = &_PyWeakref_CallableProxyType;
+ else
+ result->ob_type = &_PyWeakref_ProxyType;
+ result->wr_object = ob;
+ Py_XINCREF(callback);
+ result->wr_callback = callback;
+ if (callback == NULL)
+ prev = ref;
+ else
+ prev = (proxy == NULL) ? ref : proxy;
+
+ if (prev == NULL)
+ insert_head(result, list);
+ else
+ insert_after(result, prev);
+ PyObject_GC_Track(result);
+ }
+ }
+ return (PyObject *) result;
+}
+
+
+PyObject *
+PyWeakref_GetObject(PyObject *ref)
+{
+ if (ref == NULL || !PyWeakref_Check(ref)) {
+ PyErr_BadInternalCall();
+ return NULL;
+ }
+ return PyWeakref_GET_OBJECT(ref);
+}
+
+
+/* This is the implementation of the PyObject_ClearWeakRefs() function; it
+ * is installed in the init_weakref() function. It is called by the
+ * tp_dealloc handler to clear weak references.
+ *
+ * This iterates through the weak references for 'object' and calls callbacks
+ * for those references which have one. It returns when all callbacks have
+ * been attempted.
+ */
+void
+PyObject_ClearWeakRefs(PyObject *object)
+{
+ PyWeakReference **list;
+
+ if (object == NULL
+ || !PyType_SUPPORTS_WEAKREFS(object->ob_type)
+ || object->ob_refcnt != 0) {
+ PyErr_BadInternalCall();
+ return;
+ }
+ list = GET_WEAKREFS_LISTPTR(object);
+ /* Remove the callback-less basic and proxy references */
+ if (*list != NULL && (*list)->wr_callback == NULL) {
+ clear_weakref(*list);
+ if (*list != NULL && (*list)->wr_callback == NULL)
+ clear_weakref(*list);
+ }
+ if (*list != NULL) {
+ int count = _PyWeakref_GetWeakrefCount(*list);
+
+ if (count == 1) {
+ PyWeakReference *current = *list;
+ PyObject *callback = current->wr_callback;
+ PyObject *cbresult;
+
+ Py_INCREF(callback);
+ clear_weakref(current);
+ cbresult = PyObject_CallFunction(callback, "O", current);
+ if (cbresult == NULL)
+ PyErr_WriteUnraisable(callback);
+ else
+ Py_DECREF(cbresult);
+ Py_DECREF(callback);
+ }
+ else {
+ PyObject *tuple = PyTuple_New(count * 2);
+ PyWeakReference *current = *list;
+ int i = 0;
+
+ for (i = 0; i < count; ++i) {
+ PyWeakReference *next = current->wr_next;
+
+ Py_INCREF(current);
+ PyTuple_SET_ITEM(tuple, i * 2, (PyObject *) current);
+ PyTuple_SET_ITEM(tuple, i * 2 + 1, current->wr_callback);
+ current->wr_callback = NULL;
+ next = current->wr_next;
+ clear_weakref(current);
+ current = next;
+ }
+ for (i = 0; i < count; ++i) {
+ PyObject *current = PyTuple_GET_ITEM(tuple, i * 2);
+ PyObject *callback = PyTuple_GET_ITEM(tuple, i * 2 + 1);
+ PyObject *cbresult = PyObject_CallFunction(callback, "O",
+ current);
+ if (cbresult == NULL)
+ PyErr_WriteUnraisable(callback);
+ else
+ Py_DECREF(cbresult);
+ }
+ Py_DECREF(tuple);
+ }
+ }
+}