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//usr/include/python3.9/context.h

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

#ifndef Py_LIMITED_API

PyAPI_DATA(PyTypeObject) PyContext_Type;
typedef struct _pycontextobject PyContext;

PyAPI_DATA(PyTypeObject) PyContextVar_Type;
typedef struct _pycontextvarobject PyContextVar;

PyAPI_DATA(PyTypeObject) PyContextToken_Type;
typedef struct _pycontexttokenobject PyContextToken;

#define PyContext_CheckExact(o) Py_IS_TYPE(o, &PyContext_Type)
#define PyContextVar_CheckExact(o) Py_IS_TYPE(o, &PyContextVar_Type)
#define PyContextToken_CheckExact(o) Py_IS_TYPE(o, &PyContextToken_Type)

PyAPI_FUNC(PyObject *) PyContext_New(void);
PyAPI_FUNC(PyObject *) PyContext_Copy(PyObject *);
PyAPI_FUNC(PyObject *) PyContext_CopyCurrent(void);

PyAPI_FUNC(int) PyContext_Enter(PyObject *);
PyAPI_FUNC(int) PyContext_Exit(PyObject *);

/* Create a new context variable.

default_value can be NULL.
*/
PyAPI_FUNC(PyObject *) PyContextVar_New(
    const char *name, PyObject *default_value);

/* Get a value for the variable.

Returns -1 if an error occurred during lookup.

Returns 0 if value either was or was not found.

If value was found, *value will point to it.
   If not, it will point to:

- default_value, if not NULL;
   - the default value of "var", if not NULL;
   - NULL.

'*value' will be a new ref, if not NULL.
*/
PyAPI_FUNC(int) PyContextVar_Get(
    PyObject *var, PyObject *default_value, PyObject **value);

/* Set a new value for the variable.
   Returns NULL if an error occurs.
*/
PyAPI_FUNC(PyObject *) PyContextVar_Set(PyObject *var, PyObject *value);

/* Reset a variable to its previous value.
   Returns 0 on success, -1 on error.
*/
PyAPI_FUNC(int) PyContextVar_Reset(PyObject *var, PyObject *token);

/* This method is exposed only for CPython tests. Don not use it. */
PyAPI_FUNC(PyObject *) _PyContext_NewHamtForTests(void);

#endif /* !Py_LIMITED_API */

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