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gh-117657: Fix some races in tracebacks #121748

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gh-117657: Fix some races in tracebacks #121748

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6cb8897
Fix races in tracebacks
Fidget-Spinner Jul 14, 2024
5bc855c
use atomics in new_reference
Fidget-Spinner Jul 14, 2024
da8415d
Add more atomics
Fidget-Spinner Jul 14, 2024
ef99cb9
Update Include/cpython/pyatomic_msc.h
Fidget-Spinner Jul 22, 2024
951a34d
revert atomics
Fidget-Spinner Jul 24, 2024
6e0e176
Use argumentclinic
Fidget-Spinner Jul 24, 2024
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Fix races in tracebacks
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@Fidget-Spinner
Fidget-Spinner committed Jul 14, 2024
commit 6cb88977e006ec426daa823921739e12620ac64c
24 changes: 22 additions & 2 deletions Objects/exceptions.c
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Original file line number Diff line number Diff line change
Expand Up @@ -308,16 +308,26 @@ BaseException_set_args(PyBaseExceptionObject *self, PyObject *val, void *Py_UNUS
}

static PyObject *
BaseException_get_tb(PyBaseExceptionObject *self, void *Py_UNUSED(ignored))
BaseException_get_tb_lock_held(PyBaseExceptionObject *self, void *Py_UNUSED(ignored))
{
if (self->traceback == NULL) {
Py_RETURN_NONE;
}
return Py_NewRef(self->traceback);
}

static PyObject *
BaseException_get_tb(PyBaseExceptionObject *self, void *Py_UNUSED(ignored))
{
PyObject *res;
Py_BEGIN_CRITICAL_SECTION(self);
res = BaseException_get_tb_lock_held(self, NULL);
Py_END_CRITICAL_SECTION();
return res;
}

static int
BaseException_set_tb(PyBaseExceptionObject *self, PyObject *tb, void *Py_UNUSED(ignored))
BaseException_set_tb_lock_held(PyBaseExceptionObject *self, PyObject *tb, void *Py_UNUSED(ignored))
{
if (tb == NULL) {
PyErr_SetString(PyExc_TypeError, "__traceback__ may not be deleted");
Expand All @@ -337,6 +347,16 @@ BaseException_set_tb(PyBaseExceptionObject *self, PyObject *tb, void *Py_UNUSED(
return 0;
}

static int
BaseException_set_tb(PyBaseExceptionObject *self, PyObject *tb, void *Py_UNUSED(ignored))
{
int res;
Py_BEGIN_CRITICAL_SECTION(self);
res = BaseException_set_tb_lock_held(self, tb, NULL);
Py_END_CRITICAL_SECTION();
return res;
}

static PyObject *
BaseException_get_context(PyObject *self, void *Py_UNUSED(ignored))
{
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