cpython/Include/pystate.h

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/* 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 */
Mass checkin (more to follow for other directories). Introduce truly separate (sub)interpreter objects. For now, these must be used by separate threads, created from C. See Demo/pysvr for an example of how to use this. This also rationalizes Python's initialization and finalization behavior: Py_Initialize() -- initialize the whole interpreter Py_Finalize() -- finalize the whole interpreter tstate = Py_NewInterpreter() -- create a new (sub)interpreter Py_EndInterpreter(tstate) -- delete a new (sub)interpreter There are also new interfaces relating to threads and the interpreter lock, which can be used to create new threads, and sometimes have to be used to manipulate the interpreter lock when creating or deleting sub-interpreters. These are only defined when WITH_THREAD is defined: PyEval_AcquireLock() -- acquire the interpreter lock PyEval_ReleaseLock() -- release the interpreter lock PyEval_AcquireThread(tstate) -- acquire the lock and make the thread current PyEval_ReleaseThread(tstate) -- release the lock and make NULL current Other administrative changes: - The header file bltinmodule.h is deleted. - The init functions for Import, Sys and Builtin are now internal and declared in pythonrun.h. - Py_Setup() and Py_Cleanup() are no longer declared. - The interpreter state and thread state structures are now linked together in a chain (the chain of interpreters is a static variable in pythonrun.c). - Some members of the interpreter and thread structures have new, shorter, more consistent, names. - Added declarations for _PyImport_{Find,Fixup}Extension() to import.h.
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struct _ts; /* Forward */
struct _is; /* Forward */
typedef struct _is {
struct _is *next;
struct _ts *tstate_head;
PyObject *modules;
PyObject *sysdict;
PyObject *builtins;
PyObject *codec_search_path;
PyObject *codec_search_cache;
PyObject *codec_error_registry;
#ifdef HAVE_DLOPEN
int dlopenflags;
#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
typedef struct _ts {
struct _ts *next;
PyInterpreterState *interp;
struct _frame *frame;
int recursion_depth;
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;
int tick_counter;
/* 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);
/* 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
/* 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 */