/* Thread and interpreter state structures and their interfaces */ #ifndef Py_PYSTATE_H #define Py_PYSTATE_H #ifdef __cplusplus extern "C" { #endif #include "pythread.h" #include "coreconfig.h" /* 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); /* Placeholders while working on the new configuration API * * See PEP 432 for final anticipated contents */ typedef struct { int install_signal_handlers; /* Install signal handlers? -1 means unset */ PyObject *argv; /* sys.argv list, can be NULL */ PyObject *executable; /* sys.executable str */ PyObject *prefix; /* sys.prefix str */ PyObject *base_prefix; /* sys.base_prefix str, can be NULL */ PyObject *exec_prefix; /* sys.exec_prefix str */ PyObject *base_exec_prefix; /* sys.base_exec_prefix str, can be NULL */ PyObject *warnoptions; /* sys.warnoptions list, can be NULL */ PyObject *xoptions; /* sys._xoptions dict, can be NULL */ PyObject *module_search_path; /* sys.path list */ PyObject *pycache_prefix; /* sys.pycache_prefix str, can be NULL */ } _PyMainInterpreterConfig; #define _PyMainInterpreterConfig_INIT \ (_PyMainInterpreterConfig){.install_signal_handlers = -1} /* Note: _PyMainInterpreterConfig_INIT sets other fields to 0/NULL */ typedef struct _is { struct _is *next; struct _ts *tstate_head; int64_t id; int64_t id_refcount; PyThread_type_lock id_mutex; PyObject *modules; PyObject *modules_by_index; PyObject *sysdict; PyObject *builtins; PyObject *importlib; /* Used in Python/sysmodule.c. */ int check_interval; /* Used in Modules/_threadmodule.c. */ long num_threads; /* Support for runtime thread stack size tuning. A value of 0 means using the platform's default stack size or the size specified by the THREAD_STACK_SIZE macro. */ /* Used in Python/thread.c. */ size_t pythread_stacksize; PyObject *codec_search_path; PyObject *codec_search_cache; PyObject *codec_error_registry; int codecs_initialized; int fscodec_initialized; _PyCoreConfig core_config; _PyMainInterpreterConfig config; #ifdef HAVE_DLOPEN int dlopenflags; #endif PyObject *builtins_copy; PyObject *import_func; /* Initialized to PyEval_EvalFrameDefault(). */ _PyFrameEvalFunction eval_frame; Py_ssize_t co_extra_user_count; freefunc co_extra_freefuncs[MAX_CO_EXTRA_USERS]; #ifdef HAVE_FORK PyObject *before_forkers; PyObject *after_forkers_parent; PyObject *after_forkers_child; #endif /* AtExit module */ void (*pyexitfunc)(PyObject *); PyObject *pyexitmodule; uint64_t tstate_next_unique_id; } PyInterpreterState; #endif /* !Py_LIMITED_API */ /* 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 * * To add a new kind of trace event, also update "trace_init" in * Python/sysmodule.c to define the Python level event name */ #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 #define PyTrace_OPCODE 7 #endif /* Py_LIMITED_API */ #ifdef Py_LIMITED_API typedef struct _ts PyThreadState; #else typedef struct _err_stackitem { /* This struct represents an entry on the exception stack, which is a * per-coroutine state. (Coroutine in the computer science sense, * including the thread and generators). * This ensures that the exception state is not impacted by "yields" * from an except handler. */ PyObject *exc_type, *exc_value, *exc_traceback; struct _err_stackitem *previous_item; } _PyErr_StackItem; 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. */ int stackcheck_counter; /* '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; /* The exception currently being raised */ PyObject *curexc_type; PyObject *curexc_value; PyObject *curexc_traceback; /* The exception currently being handled, if no coroutines/generators * are present. Always last element on the stack referred to be exc_info. */ _PyErr_StackItem exc_state; /* Pointer to the top of the stack of the exceptions currently * being handled */ _PyErr_StackItem *exc_info; PyObject *dict; /* Stores per-thread state */ int gilstate_counter; PyObject *async_exc; /* Asynchronous exception to raise */ unsigned 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; int coroutine_origin_tracking_depth; PyObject *coroutine_wrapper; int in_coroutine_wrapper; PyObject *async_gen_firstiter; PyObject *async_gen_finalizer; PyObject *context; uint64_t context_ver; /* Unique thread state id. */ uint64_t id; /* XXX signal handlers should also be here */ } PyThreadState; #endif /* !Py_LIMITED_API */ PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_New(void); PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *); PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *); #if !defined(Py_LIMITED_API) PyAPI_FUNC(PyInterpreterState *) _PyInterpreterState_Get(void); #endif #ifdef Py_BUILD_CORE /* Macro which should only be used for performance critical code */ # define _PyInterpreterState_GET_UNSAFE() (PyThreadState_GET()->interp) #endif #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03070000 /* New in 3.7 */ PyAPI_FUNC(int64_t) PyInterpreterState_GetID(PyInterpreterState *); #endif #ifndef Py_LIMITED_API PyAPI_FUNC(int) _PyState_AddModule(PyObject*, struct PyModuleDef*); #endif /* !Py_LIMITED_API */ #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 *); #ifndef Py_LIMITED_API PyAPI_FUNC(PyThreadState *) _PyThreadState_Prealloc(PyInterpreterState *); PyAPI_FUNC(void) _PyThreadState_Init(PyThreadState *); #endif /* !Py_LIMITED_API */ PyAPI_FUNC(void) PyThreadState_Clear(PyThreadState *); PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *); #ifndef Py_LIMITED_API PyAPI_FUNC(void) _PyThreadState_DeleteExcept(PyThreadState *tstate); #endif /* !Py_LIMITED_API */ PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void); #ifndef Py_LIMITED_API PyAPI_FUNC(void) _PyGILState_Reinit(void); #endif /* !Py_LIMITED_API */ /* 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); #ifndef Py_LIMITED_API /* Similar to PyThreadState_Get(), but don't issue a fatal error * if it is NULL. */ PyAPI_FUNC(PyThreadState *) _PyThreadState_UncheckedGet(void); #endif /* !Py_LIMITED_API */ PyAPI_FUNC(PyThreadState *) PyThreadState_Swap(PyThreadState *); PyAPI_FUNC(PyObject *) PyThreadState_GetDict(void); PyAPI_FUNC(int) PyThreadState_SetAsyncExc(unsigned 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 # define _PyThreadState_Current _PyRuntime.gilstate.tstate_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; /* 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 /* 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 /* !Py_LIMITED_API */ /* 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_Main(void); 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 #ifdef __cplusplus } #endif #endif /* !Py_PYSTATE_H */