/* Thread and interpreter state structures and their interfaces */

#ifndef Py_PYSTATE_H

#define Py_PYSTATE_H

#ifdef __cplusplus

extern "C" {

#endif

/* State shared between threads */

struct _ts; /* Forward */

struct _is; /* Forward */

typedef struct _is {

    struct _is *next;

    struct _ts *tstate_head;

    PyObject *modules;

    PyObject *sysdict;

    PyObject *builtins;

    PyObject *modules_reloading;

    PyObject *codec_search_path;

    PyObject *codec_search_cache;

    PyObject *codec_error_registry;

#ifdef HAVE_DLOPEN

    int dlopenflags;

#endif

#ifdef WITH_TSC

    int tscdump;

#endif

} PyInterpreterState;

/* State unique per thread */

struct _frame; /* Avoid including frameobject.h */

/* Py_tracefunc return -1 when raising an exception, or 0 for success. */

typedef int (*Py_tracefunc)(PyObject *, struct _frame *, int, PyObject *);

/* The following values are used for 'what' for tracefunc functions: */

#define PyTrace_CALL 0

#define PyTrace_EXCEPTION 1

#define PyTrace_LINE 2

#define PyTrace_RETURN 3

#define PyTrace_C_CALL 4

#define PyTrace_C_EXCEPTION 5

#define PyTrace_C_RETURN 6

typedef struct _ts {

    /* See Python/ceval.c for comments explaining most fields */

    struct _ts *next;

    PyInterpreterState *interp;

    struct _frame *frame;

    int recursion_depth;

    /* 'tracing' keeps track of the execution depth when tracing/profiling.

       This is to prevent the actual trace/profile code from being recorded in

       the trace/profile. */

    int tracing;

    int use_tracing;

    Py_tracefunc c_profilefunc;

    Py_tracefunc c_tracefunc;

    PyObject *c_profileobj;

    PyObject *c_traceobj;

    PyObject *curexc_type;

    PyObject *curexc_value;

    PyObject *curexc_traceback;

    PyObject *exc_type;

    PyObject *exc_value;

    PyObject *exc_traceback;

    PyObject *dict;  /* Stores per-thread state */

    /* tick_counter is incremented whenever the check_interval ticker

     * reaches zero. The purpose is to give a useful measure of the number

     * of interpreted bytecode instructions in a given thread.  This

     * extremely lightweight statistic collector may be of interest to

     * profilers (like psyco.jit()), although nothing in the core uses it.

     */

    int tick_counter;

    int gilstate_counter;

    PyObject *async_exc; /* Asynchronous exception to raise */

    long thread_id; /* Thread id where this tstate was created */

    /* XXX signal handlers should also be here */

} PyThreadState;

PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_New(void);

PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *);

PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *);

PyAPI_FUNC(PyThreadState *) PyThreadState_New(PyInterpreterState *);

PyAPI_FUNC(void) PyThreadState_Clear(PyThreadState *);

PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *);

#ifdef WITH_THREAD

PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void);

#endif

PyAPI_FUNC(PyThreadState *) PyThreadState_Get(void);

PyAPI_FUNC(PyThreadState *) PyThreadState_Swap(PyThreadState *);

PyAPI_FUNC(PyObject *) PyThreadState_GetDict(void);

PyAPI_FUNC(int) PyThreadState_SetAsyncExc(long, PyObject *);

/* Variable and macro for in-line access to current thread state */

PyAPI_DATA(PyThreadState *) _PyThreadState_Current;

#ifdef Py_DEBUG

#define PyThreadState_GET() PyThreadState_Get()

#else

#define PyThreadState_GET() (_PyThreadState_Current)

#endif

typedef

    enum {PyGILState_LOCKED, PyGILState_UNLOCKED}

        PyGILState_STATE;

/* Ensure that the current thread is ready to call the Python

   C API, regardless of the current state of Python, or of its

   thread lock.  This may be called as many times as desired

   by a thread so long as each call is matched with a call to

   PyGILState_Release().  In general, other thread-state APIs may

   be used between _Ensure() and _Release() calls, so long as the

   thread-state is restored to its previous state before the Release().

   For example, normal use of the Py_BEGIN_ALLOW_THREADS/

   Py_END_ALLOW_THREADS macros are acceptable.

   The return value is an opaque "handle" to the thread state when

   PyGILState_Ensure() was called, and must be passed to

   PyGILState_Release() to ensure Python is left in the same state. Even

   though recursive calls are allowed, these handles can *not* be shared -

   each unique call to PyGILState_Ensure must save the handle for its

   call to PyGILState_Release.

   When the function returns, the current thread will hold the GIL.

   Failure is a fatal error.

*/

PyAPI_FUNC(PyGILState_STATE) PyGILState_Ensure(void);

/* Release any resources previously acquired.  After this call, Python's

   state will be the same as it was prior to the corresponding

   PyGILState_Ensure() call (but generally this state will be unknown to

   the caller, hence the use of the GILState API.)

   Every call to PyGILState_Ensure must be matched by a call to

   PyGILState_Release on the same thread.

*/

PyAPI_FUNC(void) PyGILState_Release(PyGILState_STATE);

/* Helper/diagnostic function - get the current thread state for

   this thread.  May return NULL if no GILState API has been used

   on the current thread.  Note the main thread always has such a

   thread-state, even if no auto-thread-state call has been made

   on the main thread.

*/

PyAPI_FUNC(PyThreadState *) PyGILState_GetThisThreadState(void);

/* The implementation of sys._current_frames()  Returns a dict mapping

   thread id to that thread's current frame.

*/

PyAPI_FUNC(PyObject *) _PyThread_CurrentFrames(void);

/* Routines for advanced debuggers, requested by David Beazley.

   Don't use unless you know what you are doing! */

PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Head(void);

PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Next(PyInterpreterState *);

PyAPI_FUNC(PyThreadState *) PyInterpreterState_ThreadHead(PyInterpreterState *);

PyAPI_FUNC(PyThreadState *) PyThreadState_Next(PyThreadState *);

typedef struct _frame *(*PyThreadFrameGetter)(PyThreadState *self_);

/* hook for PyEval_GetFrame(), requested for Psyco */

PyAPI_DATA(PyThreadFrameGetter) _PyThreadState_GetFrame;

#ifdef __cplusplus

}

#endif

#endif /* !Py_PYSTATE_H */