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Edit File : pystate.h \| Size : 15.94 KB
/* Thread and interpreter state structures and their interfaces / #ifndef Py_PYSTATE_H #define Py_PYSTATE_H #ifdef __cplusplus extern "C" { #endif #include "pythread.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); typedef struct { int install_signal_handlers; /* Install signal handlers? -1 means unset / int ignore_environment; / -E, Py_IgnoreEnvironmentFlag / int use_hash_seed; / PYTHONHASHSEED=x / unsigned long hash_seed; const char allocator; /* Memory allocator: _PyMem_SetupAllocators() / int dev_mode; / PYTHONDEVMODE, -X dev / int faulthandler; / PYTHONFAULTHANDLER, -X faulthandler / int tracemalloc; / PYTHONTRACEMALLOC, -X tracemalloc=N / int import_time; / PYTHONPROFILEIMPORTTIME, -X importtime / int show_ref_count; / -X showrefcount / int show_alloc_count; / -X showalloccount / int dump_refs; / PYTHONDUMPREFS / int malloc_stats; / PYTHONMALLOCSTATS / int coerce_c_locale; / PYTHONCOERCECLOCALE, -1 means unknown / int coerce_c_locale_warn; / PYTHONCOERCECLOCALE=warn / int utf8_mode; / PYTHONUTF8, -X utf8; -1 means unknown / wchar_t program_name; /* Program name, see also Py_GetProgramName() / int argc; / Number of command line arguments, -1 means unset / wchar_t argv; / Command line arguments / wchar_t program; /* argv[0] or "" / int nxoption; / Number of -X options / wchar_t xoptions; / -X options / int nwarnoption; / Number of warnings options / wchar_t warnoptions; / Warnings options / / Path configuration inputs / wchar_t module_search_path_env; /* PYTHONPATH environment variable / wchar_t home; /* PYTHONHOME environment variable, see also Py_SetPythonHome(). / / Path configuration outputs / int nmodule_search_path; / Number of sys.path paths, -1 means unset / wchar_t module_search_paths; / sys.path paths / wchar_t executable; /* sys.executable / wchar_t prefix; /* sys.prefix / wchar_t base_prefix; /* sys.base_prefix / wchar_t exec_prefix; /* sys.exec_prefix / wchar_t base_exec_prefix; /* sys.base_exec_prefix / / Private fields / int _disable_importlib; / Needed by freeze_importlib / } _PyCoreConfig; #define _PyCoreConfig_INIT \ (_PyCoreConfig){ \ .install_signal_handlers = -1, \ .ignore_environment = -1, \ .use_hash_seed = -1, \ .coerce_c_locale = -1, \ .faulthandler = -1, \ .tracemalloc = -1, \ .utf8_mode = -1, \ .argc = -1, \ .nmodule_search_path = -1} / Note: _PyCoreConfig_INIT sets other fields to 0/NULL / / 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 / } _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; /* 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 * _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) \|\| 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 */ Back

Edit File : pystate.h | Size : 15.94 KB

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

#ifndef Py_PYSTATE_H
#define Py_PYSTATE_H
#ifdef __cplusplus
extern "C" {
#endif

#include "pythread.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);

typedef struct {
    int install_signal_handlers;  /* Install signal handlers? -1 means unset */

int ignore_environment; /* -E, Py_IgnoreEnvironmentFlag */
    int use_hash_seed;      /* PYTHONHASHSEED=x */
    unsigned long hash_seed;
    const char *allocator;  /* Memory allocator: _PyMem_SetupAllocators() */
    int dev_mode;           /* PYTHONDEVMODE, -X dev */
    int faulthandler;       /* PYTHONFAULTHANDLER, -X faulthandler */
    int tracemalloc;        /* PYTHONTRACEMALLOC, -X tracemalloc=N */
    int import_time;        /* PYTHONPROFILEIMPORTTIME, -X importtime */
    int show_ref_count;     /* -X showrefcount */
    int show_alloc_count;   /* -X showalloccount */
    int dump_refs;          /* PYTHONDUMPREFS */
    int malloc_stats;       /* PYTHONMALLOCSTATS */
    int coerce_c_locale;    /* PYTHONCOERCECLOCALE, -1 means unknown */
    int coerce_c_locale_warn; /* PYTHONCOERCECLOCALE=warn */
    int utf8_mode;          /* PYTHONUTF8, -X utf8; -1 means unknown */

wchar_t *program_name;  /* Program name, see also Py_GetProgramName() */
    int argc;               /* Number of command line arguments,
                               -1 means unset */
    wchar_t **argv;         /* Command line arguments */
    wchar_t *program;       /* argv[0] or "" */

int nxoption;           /* Number of -X options */
    wchar_t **xoptions;     /* -X options */

int nwarnoption;        /* Number of warnings options */
    wchar_t **warnoptions;  /* Warnings options */

/* Path configuration inputs */
    wchar_t *module_search_path_env; /* PYTHONPATH environment variable */
    wchar_t *home;          /* PYTHONHOME environment variable,
                               see also Py_SetPythonHome(). */

/* Path configuration outputs */
    int nmodule_search_path;        /* Number of sys.path paths,
                                       -1 means unset */
    wchar_t **module_search_paths;  /* sys.path paths */
    wchar_t *executable;    /* sys.executable */
    wchar_t *prefix;        /* sys.prefix */
    wchar_t *base_prefix;   /* sys.base_prefix */
    wchar_t *exec_prefix;   /* sys.exec_prefix */
    wchar_t *base_exec_prefix;  /* sys.base_exec_prefix */

/* Private fields */
    int _disable_importlib; /* Needed by freeze_importlib */
} _PyCoreConfig;

#define _PyCoreConfig_INIT \
    (_PyCoreConfig){ \
        .install_signal_handlers = -1, \
        .ignore_environment = -1, \
        .use_hash_seed = -1, \
        .coerce_c_locale = -1, \
        .faulthandler = -1, \
        .tracemalloc = -1, \
        .utf8_mode = -1, \
        .argc = -1, \
        .nmodule_search_path = -1}
/* Note: _PyCoreConfig_INIT sets other fields to 0/NULL */

/* 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 */
} _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;

/* 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
     * _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) || 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 */

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