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gh-132713: Fix typing.Union[index] race condition #132802

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Merged
merged 8 commits into from
Apr 23, 2025
Merged

gh-132713: Fix typing.Union[index] race condition #132802

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gh-132713: Fix typing.Union[index] race condition
vstinner Apr 22, 2025
d81ec9b
Add comment
vstinner Apr 22, 2025
d93396a
Add comment about the micro-optimization
vstinner Apr 22, 2025
f12f905
Fix also union_parameters()
vstinner Apr 22, 2025
a7b74a3
Use FT_ATOMIC to load/store the pointer
vstinner Apr 22, 2025
27da04d
Remove the optimization
vstinner Apr 23, 2025
26c9a32
Remove empty line
vstinner Apr 23, 2025
8eb3cbd
Merge branch 'main' into union_getitem
vstinner Apr 23, 2025
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10 changes: 9 additions & 1 deletion Objects/unionobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -327,8 +327,16 @@ union_getitem(PyObject *self, PyObject *item)
{
unionobject *alias = (unionobject *)self;
// Populate __parameters__ if needed.
// Avoid the critical section if it's already initialized.
if (alias->parameters == NULL) {
alias->parameters = _Py_make_parameters(alias->args);
Py_BEGIN_CRITICAL_SECTION(alias);
// Need to check again once we got the lock, another thread may have
// initialized it while we were waiting for the lock.
if (alias->parameters == NULL) {
alias->parameters = _Py_make_parameters(alias->args);
}
Py_END_CRITICAL_SECTION();

if (alias->parameters == NULL) {
return NULL;
}
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