晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

/* Forward declarations */
struct pyruntimestate;
struct _ceval_runtime_state;

#include "pycore_interp.h"   /* PyInterpreterState.eval_frame */

extern void _Py_FinishPendingCalls(PyThreadState *tstate);
extern void _PyEval_InitRuntimeState(struct _ceval_runtime_state *);
extern int _PyEval_InitState(struct _ceval_state *ceval);
extern void _PyEval_FiniState(struct _ceval_state *ceval);
PyAPI_FUNC(void) _PyEval_SignalReceived(PyInterpreterState *interp);
PyAPI_FUNC(int) _PyEval_AddPendingCall(
    PyInterpreterState *interp,
    int (*func)(void *),
    void *arg);
PyAPI_FUNC(void) _PyEval_SignalAsyncExc(PyInterpreterState *interp);
#ifdef HAVE_FORK
extern PyStatus _PyEval_ReInitThreads(PyThreadState *tstate);
#endif
PyAPI_FUNC(void) _PyEval_SetCoroutineOriginTrackingDepth(
    PyThreadState *tstate,
    int new_depth);

void _PyEval_Fini(void);


extern PyObject* _PyEval_GetBuiltins(PyThreadState *tstate);
extern PyObject *_PyEval_BuiltinsFromGlobals(
    PyThreadState *tstate,
    PyObject *globals);


static inline PyObject*
_PyEval_EvalFrame(PyThreadState *tstate, PyFrameObject *f, int throwflag)
{
    return tstate->interp->eval_frame(tstate, f, throwflag);
}

extern PyObject *
_PyEval_Vector(PyThreadState *tstate,
            PyFrameConstructor *desc, PyObject *locals,
            PyObject* const* args, size_t argcount,
            PyObject *kwnames);

#ifdef EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
extern int _PyEval_ThreadsInitialized(PyInterpreterState *interp);
#else
extern int _PyEval_ThreadsInitialized(struct pyruntimestate *runtime);
#endif
extern PyStatus _PyEval_InitGIL(PyThreadState *tstate);
extern void _PyEval_FiniGIL(PyInterpreterState *interp);

extern void _PyEval_ReleaseLock(PyThreadState *tstate);

extern void _PyEval_DeactivateOpCache(void);


/* --- _Py_EnterRecursiveCall() ----------------------------------------- */

#ifdef USE_STACKCHECK
/* With USE_STACKCHECK macro defined, trigger stack checks in
   _Py_CheckRecursiveCall() on every 64th call to Py_EnterRecursiveCall. */
static inline int _Py_MakeRecCheck(PyThreadState *tstate)  {
    return (++tstate->recursion_depth > tstate->interp->ceval.recursion_limit
            || ++tstate->stackcheck_counter > 64);
}
#else
static inline int _Py_MakeRecCheck(PyThreadState *tstate) {
    return (++tstate->recursion_depth > tstate->interp->ceval.recursion_limit);
}
#endif

PyAPI_FUNC(int) _Py_CheckRecursiveCall(
    PyThreadState *tstate,
    const char *where);

static inline int _Py_EnterRecursiveCall(PyThreadState *tstate,
                                         const char *where) {
    return (_Py_MakeRecCheck(tstate) && _Py_CheckRecursiveCall(tstate, where));
}

static inline int _Py_EnterRecursiveCall_inline(const char *where) {
    PyThreadState *tstate = PyThreadState_GET();
    return _Py_EnterRecursiveCall(tstate, where);
}

#define Py_EnterRecursiveCall(where) _Py_EnterRecursiveCall_inline(where)

static inline void _Py_LeaveRecursiveCall(PyThreadState *tstate)  {
    tstate->recursion_depth--;
}

static inline void _Py_LeaveRecursiveCall_inline(void)  {
    PyThreadState *tstate = PyThreadState_GET();
    _Py_LeaveRecursiveCall(tstate);
}

#define Py_LeaveRecursiveCall() _Py_LeaveRecursiveCall_inline()


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