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(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; // The PyThreadState typedef is in Include/pystate.h. struct _ts { /* See Python/ceval.c for comments explaining most fields */ struct _ts *prev; struct _ts *next; PyInterpreterState *interp; /* Borrowed reference to the current frame (it can be NULL) */ 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 * _PyRuntime.gilstate.tstate_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 *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 */ }; /* Get the current interpreter state. Issue a fatal error if there no current Python thread state or no current interpreter. It cannot return NULL. The caller must hold the GIL.*/ PyAPI_FUNC(PyInterpreterState *) _PyInterpreterState_Get(void); PyAPI_FUNC(int) _PyState_AddModule(PyObject*, struct PyModuleDef*); PyAPI_FUNC(void) _PyState_ClearModules(void); PyAPI_FUNC(PyThreadState *) _PyThreadState_Prealloc(PyInterpreterState *); /* Similar to PyThreadState_Get(), but don't issue a fatal error * if it is NULL. */ PyAPI_FUNC(PyThreadState *) _PyThreadState_UncheckedGet(void); /* PyGILState */ /* 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); /* Get the single PyInterpreterState used by this process' GILState implementation. This function doesn't check for error. Return NULL before _PyGILState_Init() is called and after _PyGILState_Fini() is called. See also _PyInterpreterState_Get() and _PyInterpreterState_GET_UNSAFE(). */ PyAPI_FUNC(PyInterpreterState *) _PyGILState_GetInterpreterStateUnsafe(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_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_); /* cross-interpreter data */ struct _xid; // _PyCrossInterpreterData is similar to Py_buffer as an effectively // opaque struct that holds data outside the object machinery. This // is necessary to pass safely between interpreters in the same process. typedef struct _xid { // data is the cross-interpreter-safe derivation of a Python object // (see _PyObject_GetCrossInterpreterData). It will be NULL if the // new_object func (below) encodes the data. void *data; // obj is the Python object from which the data was derived. This // is non-NULL only if the data remains bound to the object in some // way, such that the object must be "released" (via a decref) when // the data is released. In that case the code that sets the field, // likely a registered "crossinterpdatafunc", is responsible for // ensuring it owns the reference (i.e. incref). PyObject *obj; // interp is the ID of the owning interpreter of the original // object. It corresponds to the active interpreter when // _PyObject_GetCrossInterpreterData() was called. This should only // be set by the cross-interpreter machinery. // // We use the ID rather than the PyInterpreterState to avoid issues // with deleted interpreters. Note that IDs are never re-used, so // each one will always correspond to a specific interpreter // (whether still alive or not). int64_t interp; // new_object is a function that returns a new object in the current // interpreter given the data. The resulting object (a new // reference) will be equivalent to the original object. This field // is required. PyObject *(*new_object)(struct _xid *); // free is called when the data is released. If it is NULL then // nothing will be done to free the data. For some types this is // okay (e.g. bytes) and for those types this field should be set // to NULL. However, for most the data was allocated just for // cross-interpreter use, so it must be freed when // _PyCrossInterpreterData_Release is called or the memory will // leak. In that case, at the very least this field should be set // to PyMem_RawFree (the default if not explicitly set to NULL). // The call will happen with the original interpreter activated. void (*free)(void *); } _PyCrossInterpreterData; PyAPI_FUNC(int) _PyObject_GetCrossInterpreterData(PyObject *, _PyCrossInterpreterData *); PyAPI_FUNC(PyObject *) _PyCrossInterpreterData_NewObject(_PyCrossInterpreterData *); PyAPI_FUNC(void) _PyCrossInterpreterData_Release(_PyCrossInterpreterData *); PyAPI_FUNC(int) _PyObject_CheckCrossInterpreterData(PyObject *); /* cross-interpreter data registry */ typedef int (*crossinterpdatafunc)(PyObject *, struct _xid *); PyAPI_FUNC(int) _PyCrossInterpreterData_RegisterClass(PyTypeObject *, crossinterpdatafunc); PyAPI_FUNC(crossinterpdatafunc) _PyCrossInterpreterData_Lookup(PyObject *); #ifdef __cplusplus } #endif