| |
| /* Thread and interpreter state structures and their interfaces */ |
| |
| |
| #ifndef Py_PYSTATE_H |
| #define Py_PYSTATE_H |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* This limitation is for performance and simplicity. If needed it can be |
| removed (with effort). */ |
| #define MAX_CO_EXTRA_USERS 255 |
| |
| /* State shared between threads */ |
| |
| struct _ts; /* Forward */ |
| struct _is; /* Forward */ |
| struct _frame; /* Forward declaration for PyFrameObject. */ |
| |
| #ifdef Py_LIMITED_API |
| typedef struct _is PyInterpreterState; |
| #else |
| typedef PyObject* (*_PyFrameEvalFunction)(struct _frame *, int); |
| |
| typedef struct _is { |
| |
| struct _is *next; |
| struct _ts *tstate_head; |
| |
| PyObject *modules; |
| PyObject *modules_by_index; |
| PyObject *sysdict; |
| PyObject *builtins; |
| PyObject *importlib; |
| |
| PyObject *codec_search_path; |
| PyObject *codec_search_cache; |
| PyObject *codec_error_registry; |
| int codecs_initialized; |
| int fscodec_initialized; |
| |
| #ifdef HAVE_DLOPEN |
| int dlopenflags; |
| #endif |
| #ifdef WITH_TSC |
| int tscdump; |
| #endif |
| |
| PyObject *builtins_copy; |
| PyObject *import_func; |
| /* Initialized to PyEval_EvalFrameDefault(). */ |
| _PyFrameEvalFunction eval_frame; |
| } PyInterpreterState; |
| #endif |
| |
| |
| /* State unique per thread */ |
| |
| #ifndef Py_LIMITED_API |
| /* 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 |
| #endif |
| |
| #ifdef Py_LIMITED_API |
| typedef struct _ts PyThreadState; |
| #else |
| typedef struct _ts { |
| /* See Python/ceval.c for comments explaining most fields */ |
| |
| struct _ts *prev; |
| struct _ts *next; |
| PyInterpreterState *interp; |
| |
| struct _frame *frame; |
| int recursion_depth; |
| char overflowed; /* The stack has overflowed. Allow 50 more calls |
| to handle the runtime error. */ |
| char recursion_critical; /* The current calls must not cause |
| a stack overflow. */ |
| /* '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 */ |
| |
| int gilstate_counter; |
| |
| PyObject *async_exc; /* Asynchronous exception to raise */ |
| long thread_id; /* Thread id where this tstate was created */ |
| |
| int trash_delete_nesting; |
| PyObject *trash_delete_later; |
| |
| /* Called when a thread state is deleted normally, but not when it |
| * is destroyed after fork(). |
| * Pain: to prevent rare but fatal shutdown errors (issue 18808), |
| * Thread.join() must wait for the join'ed thread's tstate to be unlinked |
| * from the tstate chain. That happens at the end of a thread's life, |
| * in pystate.c. |
| * The obvious way doesn't quite work: create a lock which the tstate |
| * unlinking code releases, and have Thread.join() wait to acquire that |
| * lock. The problem is that we _are_ at the end of the thread's life: |
| * if the thread holds the last reference to the lock, decref'ing the |
| * lock will delete the lock, and that may trigger arbitrary Python code |
| * if there's a weakref, with a callback, to the lock. But by this time |
| * _PyThreadState_Current is already NULL, so only the simplest of C code |
| * can be allowed to run (in particular it must not be possible to |
| * release the GIL). |
| * So instead of holding the lock directly, the tstate holds a weakref to |
| * the lock: that's the value of on_delete_data below. Decref'ing a |
| * weakref is harmless. |
| * on_delete points to _threadmodule.c's static release_sentinel() function. |
| * After the tstate is unlinked, release_sentinel is called with the |
| * weakref-to-lock (on_delete_data) argument, and release_sentinel releases |
| * the indirectly held lock. |
| */ |
| void (*on_delete)(void *); |
| void *on_delete_data; |
| |
| PyObject *coroutine_wrapper; |
| int in_coroutine_wrapper; |
| |
| Py_ssize_t co_extra_user_count; |
| freefunc co_extra_freefuncs[MAX_CO_EXTRA_USERS]; |
| |
| /* XXX signal handlers should also be here */ |
| |
| } PyThreadState; |
| #endif |
| |
| |
| PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_New(void); |
| PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *); |
| PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *); |
| PyAPI_FUNC(int) _PyState_AddModule(PyObject*, struct PyModuleDef*); |
| #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000 |
| /* New in 3.3 */ |
| PyAPI_FUNC(int) PyState_AddModule(PyObject*, struct PyModuleDef*); |
| PyAPI_FUNC(int) PyState_RemoveModule(struct PyModuleDef*); |
| #endif |
| PyAPI_FUNC(PyObject*) PyState_FindModule(struct PyModuleDef*); |
| #ifndef Py_LIMITED_API |
| PyAPI_FUNC(void) _PyState_ClearModules(void); |
| #endif |
| |
| PyAPI_FUNC(PyThreadState *) PyThreadState_New(PyInterpreterState *); |
| PyAPI_FUNC(PyThreadState *) _PyThreadState_Prealloc(PyInterpreterState *); |
| PyAPI_FUNC(void) _PyThreadState_Init(PyThreadState *); |
| PyAPI_FUNC(void) PyThreadState_Clear(PyThreadState *); |
| PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *); |
| PyAPI_FUNC(void) _PyThreadState_DeleteExcept(PyThreadState *tstate); |
| #ifdef WITH_THREAD |
| PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void); |
| PyAPI_FUNC(void) _PyGILState_Reinit(void); |
| #endif |
| |
| /* Return the current thread state. The global interpreter lock must be held. |
| * When the current thread state is NULL, this issues a fatal error (so that |
| * the caller needn't check for NULL). */ |
| PyAPI_FUNC(PyThreadState *) PyThreadState_Get(void); |
| |
| /* Similar to PyThreadState_Get(), but don't issue a fatal error |
| * if it is NULL. */ |
| PyAPI_FUNC(PyThreadState *) _PyThreadState_UncheckedGet(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 */ |
| |
| /* Assuming the current thread holds the GIL, this is the |
| PyThreadState for the current thread. */ |
| #ifdef Py_BUILD_CORE |
| PyAPI_DATA(_Py_atomic_address) _PyThreadState_Current; |
| # define PyThreadState_GET() \ |
| ((PyThreadState*)_Py_atomic_load_relaxed(&_PyThreadState_Current)) |
| #else |
| # define PyThreadState_GET() PyThreadState_Get() |
| #endif |
| |
| typedef |
| enum {PyGILState_LOCKED, PyGILState_UNLOCKED} |
| PyGILState_STATE; |
| |
| #ifdef WITH_THREAD |
| |
| /* 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 that 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); |
| |
| #ifndef Py_LIMITED_API |
| /* Issue #26558: Flag to disable PyGILState_Check(). |
| If set to non-zero, PyGILState_Check() always return 1. */ |
| PyAPI_DATA(int) _PyGILState_check_enabled; |
| |
| /* Helper/diagnostic function - return 1 if the current thread |
| currently holds the GIL, 0 otherwise. |
| |
| The function returns 1 if _PyGILState_check_enabled is non-zero. */ |
| PyAPI_FUNC(int) PyGILState_Check(void); |
| |
| /* Unsafe function to get the single PyInterpreterState used by this process' |
| GILState implementation. |
| |
| Return NULL before _PyGILState_Init() is called and after _PyGILState_Fini() |
| is called. */ |
| PyAPI_FUNC(PyInterpreterState *) _PyGILState_GetInterpreterStateUnsafe(void); |
| #endif |
| |
| #endif /* #ifdef WITH_THREAD */ |
| |
| /* The implementation of sys._current_frames() Returns a dict mapping |
| thread id to that thread's current frame. |
| */ |
| #ifndef Py_LIMITED_API |
| PyAPI_FUNC(PyObject *) _PyThread_CurrentFrames(void); |
| #endif |
| |
| /* Routines for advanced debuggers, requested by David Beazley. |
| Don't use unless you know what you are doing! */ |
| #ifndef Py_LIMITED_API |
| 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_); |
| #endif |
| |
| /* hook for PyEval_GetFrame(), requested for Psyco */ |
| #ifndef Py_LIMITED_API |
| PyAPI_DATA(PyThreadFrameGetter) _PyThreadState_GetFrame; |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif /* !Py_PYSTATE_H */ |