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Add assert(PyGILState_Check()) in gil_scoped_release constructor. #30067

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Add assert(PyGILState_Check()) in gil_scoped_release constructor. #30067

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1 change: 1 addition & 0 deletions include/pybind11/gil.h
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,7 @@ class gil_scoped_acquire {
class gil_scoped_release {
public:
explicit gil_scoped_release(bool disassoc = false) : disassoc(disassoc) {
assert(PyGILState_Check());
// `get_internals()` must be called here unconditionally in order to initialize
// `internals.tstate` for subsequent `gil_scoped_acquire` calls. Otherwise, an
// initialization race could occur as multiple threads try `gil_scoped_acquire`.
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