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Issue #18112: PEP 442 implementation (safe object finalization).

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This commit is contained in:
Antoine Pitrou 2013-07-30 19:59:21 +02:00
parent c5d95b17ac
commit 796564c27b
25 changed files with 1254 additions and 321 deletions
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74
Modules/_io/bufferedio.c
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@ -190,7 +190,8 @@ PyTypeObject PyBufferedIOBase_Type = {
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
bufferediobase_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
@ -209,6 +210,16 @@ PyTypeObject PyBufferedIOBase_Type = {
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
0, /* tp_finalize */
};
@ -220,7 +231,7 @@ typedef struct {
int detached;
int readable;
int writable;
int deallocating;
char finalizing;
/* True if this is a vanilla Buffered object (rather than a user derived
class) *and* the raw stream is a vanilla FileIO object. */
@ -384,8 +395,8 @@ _enter_buffered_busy(buffered *self)
static void
buffered_dealloc(buffered *self)
{
self->deallocating = 1;
if (self->ok && _PyIOBase_finalize((PyObject *) self) < 0)
self->finalizing = 1;
if (_PyIOBase_finalize((PyObject *) self) < 0)
return;
_PyObject_GC_UNTRACK(self);
self->ok = 0;
@ -428,8 +439,6 @@ buffered_traverse(buffered *self, visitproc visit, void *arg)
static int
buffered_clear(buffered *self)
{
if (self->ok && _PyIOBase_finalize((PyObject *) self) < 0)
return -1;
self->ok = 0;
Py_CLEAR(self->raw);
Py_CLEAR(self->dict);
@ -508,7 +517,7 @@ buffered_close(buffered *self, PyObject *args)
goto end;
}
if (self->deallocating) {
if (self->finalizing) {
PyObject *r = buffered_dealloc_warn(self, (PyObject *) self);
if (r)
Py_DECREF(r);
@ -1749,6 +1758,7 @@ static PyMethodDef bufferedreader_methods[] = {
static PyMemberDef bufferedreader_members[] = {
{"raw", T_OBJECT, offsetof(buffered, raw), READONLY},
{"_finalizing", T_BOOL, offsetof(buffered, finalizing), 0},
{NULL}
};
@ -1781,7 +1791,7 @@ PyTypeObject PyBufferedReader_Type = {
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC, /*tp_flags*/
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
bufferedreader_doc, /* tp_doc */
(traverseproc)buffered_traverse, /* tp_traverse */
(inquiry)buffered_clear, /* tp_clear */
@ -1800,6 +1810,16 @@ PyTypeObject PyBufferedReader_Type = {
(initproc)bufferedreader_init, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
0, /* tp_finalize */
};
@ -2130,6 +2150,7 @@ static PyMethodDef bufferedwriter_methods[] = {
static PyMemberDef bufferedwriter_members[] = {
{"raw", T_OBJECT, offsetof(buffered, raw), READONLY},
{"_finalizing", T_BOOL, offsetof(buffered, finalizing), 0},
{NULL}
};
@ -2162,7 +2183,7 @@ PyTypeObject PyBufferedWriter_Type = {
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC, /*tp_flags*/
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
bufferedwriter_doc, /* tp_doc */
(traverseproc)buffered_traverse, /* tp_traverse */
(inquiry)buffered_clear, /* tp_clear */
@ -2181,6 +2202,16 @@ PyTypeObject PyBufferedWriter_Type = {
(initproc)bufferedwriter_init, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
0, /* tp_finalize */
};
@ -2416,7 +2447,7 @@ PyTypeObject PyBufferedRWPair_Type = {
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC, /* tp_flags */
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /* tp_flags */
bufferedrwpair_doc, /* tp_doc */
(traverseproc)bufferedrwpair_traverse, /* tp_traverse */
(inquiry)bufferedrwpair_clear, /* tp_clear */
@ -2435,6 +2466,16 @@ PyTypeObject PyBufferedRWPair_Type = {
(initproc)bufferedrwpair_init, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
0, /* tp_finalize */
};
@ -2522,6 +2563,7 @@ static PyMethodDef bufferedrandom_methods[] = {
static PyMemberDef bufferedrandom_members[] = {
{"raw", T_OBJECT, offsetof(buffered, raw), READONLY},
{"_finalizing", T_BOOL, offsetof(buffered, finalizing), 0},
{NULL}
};
@ -2554,7 +2596,7 @@ PyTypeObject PyBufferedRandom_Type = {
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC, /*tp_flags*/
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
bufferedrandom_doc, /* tp_doc */
(traverseproc)buffered_traverse, /* tp_traverse */
(inquiry)buffered_clear, /* tp_clear */
@ -2573,4 +2615,14 @@ PyTypeObject PyBufferedRandom_Type = {
(initproc)bufferedrandom_init, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
0, /* tp_finalize */
};