| 1 | #ifndef Py_WEAKREFOBJECT_H |
| 2 | #define Py_WEAKREFOBJECT_H |
| 3 | #ifdef __cplusplus |
| 4 | extern "C" { |
| 5 | #endif |
| 6 | |
| 7 | |
| 8 | typedef struct _PyWeakReference PyWeakReference; |
| 9 | |
| 10 | /* PyWeakReference is the base struct for the Python ReferenceType, ProxyType, |
| 11 | * and CallableProxyType. |
| 12 | */ |
| 13 | struct _PyWeakReference { |
| 14 | PyObject_HEAD |
| 15 | |
| 16 | /* The object to which this is a weak reference, or Py_None if none. |
| 17 | * Note that this is a stealth reference: wr_object's refcount is |
| 18 | * not incremented to reflect this pointer. |
| 19 | */ |
| 20 | PyObject *wr_object; |
| 21 | |
| 22 | /* A callable to invoke when wr_object dies, or NULL if none. */ |
| 23 | PyObject *wr_callback; |
| 24 | |
| 25 | /* A cache for wr_object's hash code. As usual for hashes, this is -1 |
| 26 | * if the hash code isn't known yet. |
| 27 | */ |
| 28 | long hash; |
| 29 | |
| 30 | /* If wr_object is weakly referenced, wr_object has a doubly-linked NULL- |
| 31 | * terminated list of weak references to it. These are the list pointers. |
| 32 | * If wr_object goes away, wr_object is set to Py_None, and these pointers |
| 33 | * have no meaning then. |
| 34 | */ |
| 35 | PyWeakReference *wr_prev; |
| 36 | PyWeakReference *wr_next; |
| 37 | }; |
| 38 | |
| 39 | PyAPI_DATA(PyTypeObject) _PyWeakref_RefType; |
| 40 | PyAPI_DATA(PyTypeObject) _PyWeakref_ProxyType; |
| 41 | PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType; |
| 42 | |
| 43 | #define PyWeakref_CheckRef(op) PyObject_TypeCheck(op, &_PyWeakref_RefType) |
| 44 | #define PyWeakref_CheckRefExact(op) \ |
| 45 | ((op)->ob_type == &_PyWeakref_RefType) |
| 46 | #define PyWeakref_CheckProxy(op) \ |
| 47 | (((op)->ob_type == &_PyWeakref_ProxyType) || \ |
| 48 | ((op)->ob_type == &_PyWeakref_CallableProxyType)) |
| 49 | |
| 50 | /* This macro calls PyWeakref_CheckRef() last since that can involve a |
| 51 | function call; this makes it more likely that the function call |
| 52 | will be avoided. */ |
| 53 | #define PyWeakref_Check(op) \ |
| 54 | (PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op)) |
| 55 | |
| 56 | |
| 57 | PyAPI_FUNC(PyObject *) PyWeakref_NewRef(PyObject *ob, |
| 58 | PyObject *callback); |
| 59 | PyAPI_FUNC(PyObject *) PyWeakref_NewProxy(PyObject *ob, |
| 60 | PyObject *callback); |
| 61 | PyAPI_FUNC(PyObject *) PyWeakref_GetObject(PyObject *ref); |
| 62 | |
| 63 | PyAPI_FUNC(long) _PyWeakref_GetWeakrefCount(PyWeakReference *head); |
| 64 | |
| 65 | PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self); |
| 66 | |
| 67 | #define PyWeakref_GET_OBJECT(ref) (((PyWeakReference *)(ref))->wr_object) |
| 68 | |
| 69 | |
| 70 | #ifdef __cplusplus |
| 71 | } |
| 72 | #endif |
| 73 | #endif /* !Py_WEAKREFOBJECT_H */ |