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annotate test/include/python2.7/weakrefobject.h @ 3:7d1a9a91b989 draft

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planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
author yating-l
date Thu, 18 May 2017 18:37:28 -0400
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1 /* Weak references objects for Python. */
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3 #ifndef Py_WEAKREFOBJECT_H
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4 #define Py_WEAKREFOBJECT_H
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5 #ifdef __cplusplus
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6 extern "C" {
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7 #endif
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10 typedef struct _PyWeakReference PyWeakReference;
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12 /* PyWeakReference is the base struct for the Python ReferenceType, ProxyType,
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13 * and CallableProxyType.
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14 */
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15 struct _PyWeakReference {
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16 PyObject_HEAD
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18 /* The object to which this is a weak reference, or Py_None if none.
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19 * Note that this is a stealth reference: wr_object's refcount is
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20 * not incremented to reflect this pointer.
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21 */
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22 PyObject *wr_object;
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24 /* A callable to invoke when wr_object dies, or NULL if none. */
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25 PyObject *wr_callback;
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27 /* A cache for wr_object's hash code. As usual for hashes, this is -1
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28 * if the hash code isn't known yet.
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29 */
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30 long hash;
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32 /* If wr_object is weakly referenced, wr_object has a doubly-linked NULL-
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33 * terminated list of weak references to it. These are the list pointers.
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34 * If wr_object goes away, wr_object is set to Py_None, and these pointers
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35 * have no meaning then.
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36 */
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37 PyWeakReference *wr_prev;
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38 PyWeakReference *wr_next;
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39 };
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40
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41 PyAPI_DATA(PyTypeObject) _PyWeakref_RefType;
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42 PyAPI_DATA(PyTypeObject) _PyWeakref_ProxyType;
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43 PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType;
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45 #define PyWeakref_CheckRef(op) PyObject_TypeCheck(op, &_PyWeakref_RefType)
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46 #define PyWeakref_CheckRefExact(op) \
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47 (Py_TYPE(op) == &_PyWeakref_RefType)
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48 #define PyWeakref_CheckProxy(op) \
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49 ((Py_TYPE(op) == &_PyWeakref_ProxyType) || \
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50 (Py_TYPE(op) == &_PyWeakref_CallableProxyType))
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52 #define PyWeakref_Check(op) \
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53 (PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op))
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56 PyAPI_FUNC(PyObject *) PyWeakref_NewRef(PyObject *ob,
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57 PyObject *callback);
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58 PyAPI_FUNC(PyObject *) PyWeakref_NewProxy(PyObject *ob,
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59 PyObject *callback);
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60 PyAPI_FUNC(PyObject *) PyWeakref_GetObject(PyObject *ref);
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62 PyAPI_FUNC(Py_ssize_t) _PyWeakref_GetWeakrefCount(PyWeakReference *head);
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64 PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self);
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66 /* Explanation for the Py_REFCNT() check: when a weakref's target is part
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67 of a long chain of deallocations which triggers the trashcan mechanism,
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68 clearing the weakrefs can be delayed long after the target's refcount
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69 has dropped to zero. In the meantime, code accessing the weakref will
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70 be able to "see" the target object even though it is supposed to be
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71 unreachable. See issue #16602. */
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73 #define PyWeakref_GET_OBJECT(ref) \
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74 (Py_REFCNT(((PyWeakReference *)(ref))->wr_object) > 0 \
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75 ? ((PyWeakReference *)(ref))->wr_object \
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76 : Py_None)
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79 #ifdef __cplusplus
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80 }
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81 #endif
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82 #endif /* !Py_WEAKREFOBJECT_H */