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/* An arena-like memory interface for the compiler.
*/
#ifndef Py_PYARENA_H
#define Py_PYARENA_H
#ifdef __cplusplus
extern "C" {
#endif
typedef struct _arena PyArena;
/* PyArena_New() and PyArena_Free() create a new arena and free it,
respectively. Once an arena has been created, it can be used
to allocate memory via PyArena_Malloc(). Pointers to PyObject can
also be registered with the arena via PyArena_AddPyObject(), and the
arena will ensure that the PyObjects stay alive at least until
PyArena_Free() is called. When an arena is freed, all the memory it
allocated is freed, the arena releases internal references to registered
PyObject*, and none of its pointers are valid.
XXX (tim) What does "none of its pointers are valid" mean? Does it
XXX mean that pointers previously obtained via PyArena_Malloc() are
XXX no longer valid? (That's clearly true, but not sure that's what
XXX the text is trying to say.)
PyArena_New() returns an arena pointer. On error, it
returns a negative number and sets an exception.
XXX (tim): Not true. On error, PyArena_New() actually returns NULL,
XXX and looks like it may or may not set an exception (e.g., if the
XXX internal PyList_New(0) returns NULL, PyArena_New() passes that on
XXX and an exception is set; OTOH, if the internal
XXX block_new(DEFAULT_BLOCK_SIZE) returns NULL, that's passed on but
XXX an exception is not set in that case).
*/
PyAPI_FUNC(PyArena *) PyArena_New(void);
PyAPI_FUNC(void) PyArena_Free(PyArena *);
PyAPI_FUNC(void *) PyArena_Malloc(PyArena *, size_t);
/* This routines isn't a proper arena allocation routine. It takes
a PyObject* and records it so that it can be DECREFed when the
arena is freed.
*/
PyAPI_FUNC(int) PyArena_AddPyObject(PyArena *, PyObject *);
#ifdef __cplusplus
}
#endif
#endif /* !Py_PYARENA_H */
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