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Code Issues Projects Releases Packages Wiki Activity Actions 11

gh-123471: Make itertools.chain thread-safe (#135689)

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Pieter Eendebak 2025-06-30 13:06:58 +02:00 • committed by GitHub
parent 536a5ff153
commit 0533c1faf2
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3 changed files with 43 additions and 4 deletions
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14
Modules/itertoolsmodule.c
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@ -1880,8 +1880,8 @@ chain_traverse(PyObject *op, visitproc visit, void *arg)
return 0;
}
static PyObject *
chain_next(PyObject *op)
static inline PyObject *
chain_next_lock_held(PyObject *op)
{
chainobject *lz = chainobject_CAST(op);
PyObject *item;
@ -1919,6 +1919,16 @@ chain_next(PyObject *op)
return NULL;
}
static PyObject *
chain_next(PyObject *op)
{
PyObject *result;
Py_BEGIN_CRITICAL_SECTION(op);
result = chain_next_lock_held(op);
Py_END_CRITICAL_SECTION()
return result;
}
PyDoc_STRVAR(chain_doc,
"chain(*iterables)\n\
--\n\