test_normalization should skip and not crash when the resource isn't available
[python.git] / Include / pystate.h
blob4919d99b6c76bca1664b3e48f7977c29397ef68d
2 /* Thread and interpreter state structures and their interfaces */
5 #ifndef Py_PYSTATE_H
6 #define Py_PYSTATE_H
7 #ifdef __cplusplus
8 extern "C" {
9 #endif
11 /* State shared between threads */
13 struct _ts; /* Forward */
14 struct _is; /* Forward */
16 typedef struct _is {
18 struct _is *next;
19 struct _ts *tstate_head;
21 PyObject *modules;
22 PyObject *sysdict;
23 PyObject *builtins;
24 PyObject *modules_reloading;
26 PyObject *codec_search_path;
27 PyObject *codec_search_cache;
28 PyObject *codec_error_registry;
30 #ifdef HAVE_DLOPEN
31 int dlopenflags;
32 #endif
33 #ifdef WITH_TSC
34 int tscdump;
35 #endif
37 } PyInterpreterState;
40 /* State unique per thread */
42 struct _frame; /* Avoid including frameobject.h */
44 /* Py_tracefunc return -1 when raising an exception, or 0 for success. */
45 typedef int (*Py_tracefunc)(PyObject *, struct _frame *, int, PyObject *);
47 /* The following values are used for 'what' for tracefunc functions: */
48 #define PyTrace_CALL 0
49 #define PyTrace_EXCEPTION 1
50 #define PyTrace_LINE 2
51 #define PyTrace_RETURN 3
52 #define PyTrace_C_CALL 4
53 #define PyTrace_C_EXCEPTION 5
54 #define PyTrace_C_RETURN 6
56 typedef struct _ts {
57 /* See Python/ceval.c for comments explaining most fields */
59 struct _ts *next;
60 PyInterpreterState *interp;
62 struct _frame *frame;
63 int recursion_depth;
64 /* 'tracing' keeps track of the execution depth when tracing/profiling.
65 This is to prevent the actual trace/profile code from being recorded in
66 the trace/profile. */
67 int tracing;
68 int use_tracing;
70 Py_tracefunc c_profilefunc;
71 Py_tracefunc c_tracefunc;
72 PyObject *c_profileobj;
73 PyObject *c_traceobj;
75 PyObject *curexc_type;
76 PyObject *curexc_value;
77 PyObject *curexc_traceback;
79 PyObject *exc_type;
80 PyObject *exc_value;
81 PyObject *exc_traceback;
83 PyObject *dict; /* Stores per-thread state */
85 /* tick_counter is incremented whenever the check_interval ticker
86 * reaches zero. The purpose is to give a useful measure of the number
87 * of interpreted bytecode instructions in a given thread. This
88 * extremely lightweight statistic collector may be of interest to
89 * profilers (like psyco.jit()), although nothing in the core uses it.
91 int tick_counter;
93 int gilstate_counter;
95 PyObject *async_exc; /* Asynchronous exception to raise */
96 long thread_id; /* Thread id where this tstate was created */
98 /* XXX signal handlers should also be here */
100 } PyThreadState;
103 PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_New(void);
104 PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *);
105 PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *);
107 PyAPI_FUNC(PyThreadState *) PyThreadState_New(PyInterpreterState *);
108 PyAPI_FUNC(void) PyThreadState_Clear(PyThreadState *);
109 PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *);
110 #ifdef WITH_THREAD
111 PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void);
112 #endif
114 PyAPI_FUNC(PyThreadState *) PyThreadState_Get(void);
115 PyAPI_FUNC(PyThreadState *) PyThreadState_Swap(PyThreadState *);
116 PyAPI_FUNC(PyObject *) PyThreadState_GetDict(void);
117 PyAPI_FUNC(int) PyThreadState_SetAsyncExc(long, PyObject *);
120 /* Variable and macro for in-line access to current thread state */
122 PyAPI_DATA(PyThreadState *) _PyThreadState_Current;
124 #ifdef Py_DEBUG
125 #define PyThreadState_GET() PyThreadState_Get()
126 #else
127 #define PyThreadState_GET() (_PyThreadState_Current)
128 #endif
130 typedef
131 enum {PyGILState_LOCKED, PyGILState_UNLOCKED}
132 PyGILState_STATE;
134 /* Ensure that the current thread is ready to call the Python
135 C API, regardless of the current state of Python, or of its
136 thread lock. This may be called as many times as desired
137 by a thread so long as each call is matched with a call to
138 PyGILState_Release(). In general, other thread-state APIs may
139 be used between _Ensure() and _Release() calls, so long as the
140 thread-state is restored to its previous state before the Release().
141 For example, normal use of the Py_BEGIN_ALLOW_THREADS/
142 Py_END_ALLOW_THREADS macros are acceptable.
144 The return value is an opaque "handle" to the thread state when
145 PyGILState_Ensure() was called, and must be passed to
146 PyGILState_Release() to ensure Python is left in the same state. Even
147 though recursive calls are allowed, these handles can *not* be shared -
148 each unique call to PyGILState_Ensure must save the handle for its
149 call to PyGILState_Release.
151 When the function returns, the current thread will hold the GIL.
153 Failure is a fatal error.
155 PyAPI_FUNC(PyGILState_STATE) PyGILState_Ensure(void);
157 /* Release any resources previously acquired. After this call, Python's
158 state will be the same as it was prior to the corresponding
159 PyGILState_Ensure() call (but generally this state will be unknown to
160 the caller, hence the use of the GILState API.)
162 Every call to PyGILState_Ensure must be matched by a call to
163 PyGILState_Release on the same thread.
165 PyAPI_FUNC(void) PyGILState_Release(PyGILState_STATE);
167 /* Helper/diagnostic function - get the current thread state for
168 this thread. May return NULL if no GILState API has been used
169 on the current thread. Note the main thread always has such a
170 thread-state, even if no auto-thread-state call has been made
171 on the main thread.
173 PyAPI_FUNC(PyThreadState *) PyGILState_GetThisThreadState(void);
175 /* The implementation of sys._current_frames() Returns a dict mapping
176 thread id to that thread's current frame.
178 PyAPI_FUNC(PyObject *) _PyThread_CurrentFrames(void);
180 /* Routines for advanced debuggers, requested by David Beazley.
181 Don't use unless you know what you are doing! */
182 PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Head(void);
183 PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Next(PyInterpreterState *);
184 PyAPI_FUNC(PyThreadState *) PyInterpreterState_ThreadHead(PyInterpreterState *);
185 PyAPI_FUNC(PyThreadState *) PyThreadState_Next(PyThreadState *);
187 typedef struct _frame *(*PyThreadFrameGetter)(PyThreadState *self_);
189 /* hook for PyEval_GetFrame(), requested for Psyco */
190 PyAPI_DATA(PyThreadFrameGetter) _PyThreadState_GetFrame;
192 #ifdef __cplusplus
194 #endif
195 #endif /* !Py_PYSTATE_H */