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The C and C++ Include Header Files

cat -n /usr/include/python3.14/internal/pycore_crossinterp_data_registry.h

     1	#ifndef Py_CORE_CROSSINTERP_DATA_REGISTRY_H
     2	#  error "this header must not be included directly"
     3	#endif
     4	
     5	
     6	// For now we use a global registry of shareable classes.  An
     7	// alternative would be to add a tp_* slot for a class's
     8	// xidatafunc. It would be simpler and more efficient.
     9	
    10	struct _xid_regitem;
    11	
    12	typedef struct _xid_regitem {
    13	    struct _xid_regitem *prev;
    14	    struct _xid_regitem *next;
    15	    /* This can be a dangling pointer, but only if weakref is set. */
    16	    PyTypeObject *cls;
    17	    /* This is NULL for builtin types. */
    18	    PyObject *weakref;
    19	    size_t refcount;
    20	    _PyXIData_getdata_t getdata;
    21	} _PyXIData_regitem_t;
    22	
    23	typedef struct {
    24	    int global;  /* builtin types or heap types */
    25	    int initialized;
    26	    PyMutex mutex;
    27	    _PyXIData_regitem_t *head;
    28	} _PyXIData_registry_t;
    29	
    30	PyAPI_FUNC(int) _PyXIData_RegisterClass(
    31	    PyThreadState *,
    32	    PyTypeObject *,
    33	    _PyXIData_getdata_t);
    34	PyAPI_FUNC(int) _PyXIData_UnregisterClass(
    35	    PyThreadState *,
    36	    PyTypeObject *);
    37	
    38	struct _xid_lookup_state {
    39	    // XXX Remove this field once we have a tp_* slot.
    40	    _PyXIData_registry_t registry;
    41	};