mirror of https://github.com/python/cpython
313 lines
10 KiB
C
313 lines
10 KiB
C
|
|
/* 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
|
|
|
|
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];
|
|
|
|
PyObject *async_gen_firstiter;
|
|
PyObject *async_gen_finalizer;
|
|
|
|
/* 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 *);
|
|
#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 */
|
|
#ifdef WITH_THREAD
|
|
PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void);
|
|
#ifndef Py_LIMITED_API
|
|
PyAPI_FUNC(void) _PyGILState_Reinit(void);
|
|
#endif /* !Py_LIMITED_API */
|
|
#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);
|
|
|
|
#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(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 */
|