blob: 9306a57715a747c1d626dd1623de28676350d5f3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
Copyright (c) 2000, BeOpen.com.
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
All rights reserved.
See the file "Misc/COPYRIGHT" for information on usage and
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
******************************************************************/
/* Thread and interpreter state structures and their interfaces */
#include "Python.h"
#define ZAP(x) { \
PyObject *tmp = (PyObject *)(x); \
(x) = NULL; \
Py_XDECREF(tmp); \
}
#ifdef WITH_THREAD
#include "pythread.h"
static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
#define HEAD_INIT() (head_mutex || (head_mutex = PyThread_allocate_lock()))
#define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
#define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
#else
#define HEAD_INIT() /* Nothing */
#define HEAD_LOCK() /* Nothing */
#define HEAD_UNLOCK() /* Nothing */
#endif
static PyInterpreterState *interp_head = NULL;
PyThreadState *_PyThreadState_Current = NULL;
PyInterpreterState *
PyInterpreterState_New()
{
PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
if (interp != NULL) {
HEAD_INIT();
interp->modules = NULL;
interp->sysdict = NULL;
interp->builtins = NULL;
interp->checkinterval = 10;
interp->tstate_head = NULL;
interp->next = interp_head;
interp_head = interp;
}
return interp;
}
void
PyInterpreterState_Clear(interp)
PyInterpreterState *interp;
{
PyThreadState *p;
HEAD_LOCK();
for (p = interp->tstate_head; p != NULL; p = p->next)
PyThreadState_Clear(p);
HEAD_UNLOCK();
ZAP(interp->modules);
ZAP(interp->sysdict);
ZAP(interp->builtins);
}
static void
zapthreads(interp)
PyInterpreterState *interp;
{
PyThreadState *p;
/* No need to lock the mutex here because this should only happen
when the threads are all really dead (XXX famous last words). */
while ((p = interp->tstate_head) != NULL) {
PyThreadState_Delete(p);
}
}
void
PyInterpreterState_Delete(interp)
PyInterpreterState *interp;
{
PyInterpreterState **p;
zapthreads(interp);
for (p = &interp_head; ; p = &(*p)->next) {
if (*p == NULL)
Py_FatalError(
"PyInterpreterState_Delete: invalid interp");
if (*p == interp)
break;
}
if (interp->tstate_head != NULL)
Py_FatalError("PyInterpreterState_Delete: remaining threads");
*p = interp->next;
PyMem_DEL(interp);
}
PyThreadState *
PyThreadState_New(interp)
PyInterpreterState *interp;
{
PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
if (tstate != NULL) {
tstate->interp = interp;
tstate->frame = NULL;
tstate->recursion_depth = 0;
tstate->ticker = 0;
tstate->tracing = 0;
tstate->dict = NULL;
tstate->curexc_type = NULL;
tstate->curexc_value = NULL;
tstate->curexc_traceback = NULL;
tstate->exc_type = NULL;
tstate->exc_value = NULL;
tstate->exc_traceback = NULL;
tstate->sys_profilefunc = NULL;
tstate->sys_tracefunc = NULL;
HEAD_LOCK();
tstate->next = interp->tstate_head;
interp->tstate_head = tstate;
HEAD_UNLOCK();
}
return tstate;
}
void
PyThreadState_Clear(tstate)
PyThreadState *tstate;
{
if (Py_VerboseFlag && tstate->frame != NULL)
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a frame\n");
ZAP(tstate->frame);
ZAP(tstate->dict);
ZAP(tstate->curexc_type);
ZAP(tstate->curexc_value);
ZAP(tstate->curexc_traceback);
ZAP(tstate->exc_type);
ZAP(tstate->exc_value);
ZAP(tstate->exc_traceback);
ZAP(tstate->sys_profilefunc);
ZAP(tstate->sys_tracefunc);
}
void
PyThreadState_Delete(tstate)
PyThreadState *tstate;
{
PyInterpreterState *interp;
PyThreadState **p;
if (tstate == NULL)
Py_FatalError("PyThreadState_Delete: NULL tstate");
if (tstate == _PyThreadState_Current)
Py_FatalError("PyThreadState_Delete: tstate is still current");
interp = tstate->interp;
if (interp == NULL)
Py_FatalError("PyThreadState_Delete: NULL interp");
HEAD_LOCK();
for (p = &interp->tstate_head; ; p = &(*p)->next) {
if (*p == NULL)
Py_FatalError(
"PyThreadState_Delete: invalid tstate");
if (*p == tstate)
break;
}
*p = tstate->next;
HEAD_UNLOCK();
PyMem_DEL(tstate);
}
PyThreadState *
PyThreadState_Get()
{
if (_PyThreadState_Current == NULL)
Py_FatalError("PyThreadState_Get: no current thread");
return _PyThreadState_Current;
}
PyThreadState *
PyThreadState_Swap(new)
PyThreadState *new;
{
PyThreadState *old = _PyThreadState_Current;
_PyThreadState_Current = new;
return old;
}
/* An extension mechanism to store arbitrary additional per-thread state.
PyThreadState_GetDict() returns a dictionary that can be used to hold such
state; the caller should pick a unique key and store its state there. If
PyThreadState_GetDict() returns NULL, an exception has been raised (most
likely MemoryError) and the caller should pass on the exception. */
PyObject *
PyThreadState_GetDict()
{
if (_PyThreadState_Current == NULL)
Py_FatalError("PyThreadState_GetDict: no current thread");
if (_PyThreadState_Current->dict == NULL)
_PyThreadState_Current->dict = PyDict_New();
return _PyThreadState_Current->dict;
}
|
