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bpo-33583: Add note in PyObject_GC_Resize() doc (GH-7021) 

(cherry picked from commit 1179f4b40f)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2018-05-21 07:51:00 -07:00 committed by INADA Naoki
parent 316f86911a
commit 2b4ed5da1d
2 changed files with 2 additions and 1 deletions
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2
Doc/c-api/gcsupport.rst
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@ -49,7 +49,7 @@ Constructors for container types must conform to two rules:
.. c:function:: TYPE* PyObject_GC_Resize(TYPE, PyVarObject *op, Py_ssize_t newsize)
Resize an object allocated by :c:func:`PyObject_NewVar`. Returns the
resized object or *NULL* on failure.
resized object or *NULL* on failure. *op* must not be tracked by the collector yet.
.. c:function:: void PyObject_GC_Track(PyObject *op)

1
Modules/gcmodule.c
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@ -1752,6 +1752,7 @@ _PyObject_GC_Resize(PyVarObject *op, Py_ssize_t nitems)
{
const size_t basicsize = _PyObject_VAR_SIZE(Py_TYPE(op), nitems);
PyGC_Head *g = AS_GC(op);
assert(!IS_TRACKED(op));
if (basicsize > PY_SSIZE_T_MAX - sizeof(PyGC_Head))
return (PyVarObject *)PyErr_NoMemory();
g = (PyGC_Head *)PyObject_REALLOC(g, sizeof(PyGC_Head) + basicsize);