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Explain the purpose of the b_needsfree flag (forward ported from release25-maint).

This commit is contained in:
Thomas Heller 2007-03-22 20:34:37 +00:00
parent f493cbd824
commit 82730f8d11
1 changed files with 6 additions and 0 deletions
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6
Modules/_ctypes/_ctypes.c
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@ -2181,6 +2181,12 @@ static void CData_MallocBuffer(CDataObject *obj, StgDictObject *dict)
if ((size_t)dict->size <= sizeof(obj->b_value)) {
/* No need to call malloc, can use the default buffer */
obj->b_ptr = (char *)&obj->b_value;
/* The b_needsfree flag does not mean that we actually did
call PyMem_Malloc to allocate the memory block; instead it
means we are the *owner* of the memory and are responsible
for freeing resources associated with the memory. This is
also the reason that b_needsfree is exposed to Python.
*/
obj->b_needsfree = 1;
} else {
/* In python 2.4, and ctypes 0.9.6, the malloc call took about