https://github.com/python/cpython/commit/9d127e83b9e6fbbb50ee047a0444c189a8770ada
commit: 9d127e83b9e6fbbb50ee047a0444c189a8770ada
branch: main
author: Pieter Eendebak <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2025-04-13T13:26:58+05:30
summary:
gh-123471: Make concurrent iteration over itertools.repeat safe under
free-threading (#131247)
files:
A Misc/NEWS.d/next/Library/2025-03-14-14-18-49.gh-issue-123471.sduBKk.rst
M Modules/itertoolsmodule.c
diff --git
a/Misc/NEWS.d/next/Library/2025-03-14-14-18-49.gh-issue-123471.sduBKk.rst
b/Misc/NEWS.d/next/Library/2025-03-14-14-18-49.gh-issue-123471.sduBKk.rst
new file mode 100644
index 00000000000000..b3829c72e5cad7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-14-14-18-49.gh-issue-123471.sduBKk.rst
@@ -0,0 +1 @@
+Make concurrent iterations over :class:`itertools.repeat` safe under
free-threading.
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index c0448efed19a44..943c1e8607b38f 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -3628,10 +3628,14 @@ static PyObject *
repeat_next(PyObject *op)
{
repeatobject *ro = repeatobject_CAST(op);
- if (ro->cnt == 0)
+ Py_ssize_t cnt = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->cnt);
+ if (cnt == 0) {
return NULL;
- if (ro->cnt > 0)
- ro->cnt--;
+ }
+ if (cnt > 0) {
+ cnt--;
+ FT_ATOMIC_STORE_SSIZE_RELAXED(ro->cnt, cnt);
+ }
return Py_NewRef(ro->element);
}
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