cpython/Include/critical_section.h

#ifndef Py_CRITICAL_SECTION_H
#define Py_CRITICAL_SECTION_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_LIMITED_API
#define Py_CPYTHON_CRITICAL_SECTION_H
#  include "cpython/critical_section.h"
#  undef Py_CPYTHON_CRITICAL_SECTION_H
#endif

#ifdef __cplusplus
}
#endif
#endif /* !Py_CRITICAL_SECTION_H */