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fix: make gil_safe_call_once thread-safe in free-threaded CPython (#5246)
* fix: Make gil_safe_call_once thread-safe in free-threaded CPython The "is_initialized_" flags is not protected by the GIL in free-threaded Python, so it needs to be an atomic field. Fixes #5245 * style: pre-commit fixes * Apply changes from code review --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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@ -8,6 +8,10 @@
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#include <cassert>
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#include <mutex>
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#ifdef Py_GIL_DISABLED
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# include <atomic>
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#endif
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PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
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// Use the `gil_safe_call_once_and_store` class below instead of the naive
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@ -82,7 +86,12 @@ public:
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private:
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alignas(T) char storage_[sizeof(T)] = {};
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std::once_flag once_flag_ = {};
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bool is_initialized_ = false;
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#ifdef Py_GIL_DISABLED
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std::atomic_bool
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#else
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bool
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#endif
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is_initialized_{false};
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// The `is_initialized_`-`storage_` pair is very similar to `std::optional`,
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// but the latter does not have the triviality properties of former,
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// therefore `std::optional` is not a viable alternative here.
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