Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 2 | Copyright (c) 2000, BeOpen.com. |
| 3 | Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| 4 | Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| 5 | All rights reserved. |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 6 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 7 | See the file "Misc/COPYRIGHT" for information on usage and |
| 8 | redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 9 | ******************************************************************/ |
| 10 | |
| 11 | /* Thread and interpreter state structures and their interfaces */ |
| 12 | |
| 13 | #include "Python.h" |
| 14 | |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 15 | #define ZAP(x) { \ |
| 16 | PyObject *tmp = (PyObject *)(x); \ |
| 17 | (x) = NULL; \ |
| 18 | Py_XDECREF(tmp); \ |
| 19 | } |
| 20 | |
| 21 | |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 22 | #ifdef WITH_THREAD |
| 23 | #include "pythread.h" |
| 24 | static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */ |
| 25 | #define HEAD_INIT() (head_mutex || (head_mutex = PyThread_allocate_lock())) |
| 26 | #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK) |
| 27 | #define HEAD_UNLOCK() PyThread_release_lock(head_mutex) |
| 28 | #else |
| 29 | #define HEAD_INIT() /* Nothing */ |
| 30 | #define HEAD_LOCK() /* Nothing */ |
| 31 | #define HEAD_UNLOCK() /* Nothing */ |
| 32 | #endif |
| 33 | |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 34 | static PyInterpreterState *interp_head = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 35 | |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 36 | PyThreadState *_PyThreadState_Current = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 37 | |
| 38 | |
| 39 | PyInterpreterState * |
| 40 | PyInterpreterState_New() |
| 41 | { |
| 42 | PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 43 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 44 | if (interp != NULL) { |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 45 | HEAD_INIT(); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 46 | interp->modules = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 47 | interp->sysdict = NULL; |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 48 | interp->builtins = NULL; |
| 49 | interp->checkinterval = 10; |
| 50 | interp->tstate_head = NULL; |
| 51 | |
| 52 | interp->next = interp_head; |
| 53 | interp_head = interp; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 54 | } |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 55 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 56 | return interp; |
| 57 | } |
| 58 | |
| 59 | |
| 60 | void |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 61 | PyInterpreterState_Clear(interp) |
| 62 | PyInterpreterState *interp; |
| 63 | { |
| 64 | PyThreadState *p; |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 65 | HEAD_LOCK(); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 66 | for (p = interp->tstate_head; p != NULL; p = p->next) |
| 67 | PyThreadState_Clear(p); |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 68 | HEAD_UNLOCK(); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 69 | ZAP(interp->modules); |
| 70 | ZAP(interp->sysdict); |
| 71 | ZAP(interp->builtins); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | static void |
| 76 | zapthreads(interp) |
| 77 | PyInterpreterState *interp; |
| 78 | { |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 79 | PyThreadState *p; |
| 80 | /* No need to lock the mutex here because this should only happen |
| 81 | when the threads are all really dead (XXX famous last words). */ |
| 82 | while ((p = interp->tstate_head) != NULL) { |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 83 | PyThreadState_Delete(p); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 84 | } |
| 85 | } |
| 86 | |
| 87 | |
| 88 | void |
Guido van Rossum | f9cba09 | 1997-05-20 22:23:34 +0000 | [diff] [blame] | 89 | PyInterpreterState_Delete(interp) |
| 90 | PyInterpreterState *interp; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 91 | { |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 92 | PyInterpreterState **p; |
| 93 | zapthreads(interp); |
| 94 | for (p = &interp_head; ; p = &(*p)->next) { |
| 95 | if (*p == NULL) |
| 96 | Py_FatalError( |
| 97 | "PyInterpreterState_Delete: invalid interp"); |
| 98 | if (*p == interp) |
| 99 | break; |
| 100 | } |
| 101 | if (interp->tstate_head != NULL) |
| 102 | Py_FatalError("PyInterpreterState_Delete: remaining threads"); |
| 103 | *p = interp->next; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 104 | PyMem_DEL(interp); |
| 105 | } |
| 106 | |
| 107 | |
| 108 | PyThreadState * |
Guido van Rossum | f9cba09 | 1997-05-20 22:23:34 +0000 | [diff] [blame] | 109 | PyThreadState_New(interp) |
| 110 | PyInterpreterState *interp; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 111 | { |
| 112 | PyThreadState *tstate = PyMem_NEW(PyThreadState, 1); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 113 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 114 | if (tstate != NULL) { |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 115 | tstate->interp = interp; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 116 | |
| 117 | tstate->frame = NULL; |
| 118 | tstate->recursion_depth = 0; |
| 119 | tstate->ticker = 0; |
| 120 | tstate->tracing = 0; |
| 121 | |
Guido van Rossum | ede0439 | 1998-04-10 20:18:25 +0000 | [diff] [blame] | 122 | tstate->dict = NULL; |
| 123 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 124 | tstate->curexc_type = NULL; |
| 125 | tstate->curexc_value = NULL; |
| 126 | tstate->curexc_traceback = NULL; |
| 127 | |
| 128 | tstate->exc_type = NULL; |
| 129 | tstate->exc_value = NULL; |
| 130 | tstate->exc_traceback = NULL; |
| 131 | |
| 132 | tstate->sys_profilefunc = NULL; |
| 133 | tstate->sys_tracefunc = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 134 | |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 135 | HEAD_LOCK(); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 136 | tstate->next = interp->tstate_head; |
| 137 | interp->tstate_head = tstate; |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 138 | HEAD_UNLOCK(); |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 139 | } |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 140 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 141 | return tstate; |
| 142 | } |
| 143 | |
| 144 | |
| 145 | void |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 146 | PyThreadState_Clear(tstate) |
| 147 | PyThreadState *tstate; |
| 148 | { |
Guido van Rossum | 22348dc | 1997-11-03 22:08:36 +0000 | [diff] [blame] | 149 | if (Py_VerboseFlag && tstate->frame != NULL) |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 150 | fprintf(stderr, |
Guido van Rossum | 5f896a4 | 1997-08-21 02:28:19 +0000 | [diff] [blame] | 151 | "PyThreadState_Clear: warning: thread still has a frame\n"); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 152 | |
| 153 | ZAP(tstate->frame); |
| 154 | |
Guido van Rossum | ede0439 | 1998-04-10 20:18:25 +0000 | [diff] [blame] | 155 | ZAP(tstate->dict); |
| 156 | |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 157 | ZAP(tstate->curexc_type); |
| 158 | ZAP(tstate->curexc_value); |
| 159 | ZAP(tstate->curexc_traceback); |
| 160 | |
| 161 | ZAP(tstate->exc_type); |
| 162 | ZAP(tstate->exc_value); |
| 163 | ZAP(tstate->exc_traceback); |
| 164 | |
| 165 | ZAP(tstate->sys_profilefunc); |
| 166 | ZAP(tstate->sys_tracefunc); |
| 167 | } |
| 168 | |
| 169 | |
| 170 | void |
Guido van Rossum | f9cba09 | 1997-05-20 22:23:34 +0000 | [diff] [blame] | 171 | PyThreadState_Delete(tstate) |
| 172 | PyThreadState *tstate; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 173 | { |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 174 | PyInterpreterState *interp; |
| 175 | PyThreadState **p; |
| 176 | if (tstate == NULL) |
| 177 | Py_FatalError("PyThreadState_Delete: NULL tstate"); |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 178 | if (tstate == _PyThreadState_Current) |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 179 | Py_FatalError("PyThreadState_Delete: tstate is still current"); |
| 180 | interp = tstate->interp; |
| 181 | if (interp == NULL) |
| 182 | Py_FatalError("PyThreadState_Delete: NULL interp"); |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 183 | HEAD_LOCK(); |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 184 | for (p = &interp->tstate_head; ; p = &(*p)->next) { |
| 185 | if (*p == NULL) |
| 186 | Py_FatalError( |
| 187 | "PyThreadState_Delete: invalid tstate"); |
| 188 | if (*p == tstate) |
| 189 | break; |
| 190 | } |
| 191 | *p = tstate->next; |
Guido van Rossum | 1d5ad90 | 1999-06-18 14:22:24 +0000 | [diff] [blame] | 192 | HEAD_UNLOCK(); |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 193 | PyMem_DEL(tstate); |
| 194 | } |
| 195 | |
| 196 | |
| 197 | PyThreadState * |
| 198 | PyThreadState_Get() |
| 199 | { |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 200 | if (_PyThreadState_Current == NULL) |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 201 | Py_FatalError("PyThreadState_Get: no current thread"); |
| 202 | |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 203 | return _PyThreadState_Current; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | |
| 207 | PyThreadState * |
Guido van Rossum | f9cba09 | 1997-05-20 22:23:34 +0000 | [diff] [blame] | 208 | PyThreadState_Swap(new) |
| 209 | PyThreadState *new; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 210 | { |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 211 | PyThreadState *old = _PyThreadState_Current; |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 212 | |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 213 | _PyThreadState_Current = new; |
Guido van Rossum | 25ce566 | 1997-08-02 03:10:38 +0000 | [diff] [blame] | 214 | |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 215 | return old; |
| 216 | } |
Guido van Rossum | ede0439 | 1998-04-10 20:18:25 +0000 | [diff] [blame] | 217 | |
| 218 | /* An extension mechanism to store arbitrary additional per-thread state. |
| 219 | PyThreadState_GetDict() returns a dictionary that can be used to hold such |
| 220 | state; the caller should pick a unique key and store its state there. If |
| 221 | PyThreadState_GetDict() returns NULL, an exception has been raised (most |
| 222 | likely MemoryError) and the caller should pass on the exception. */ |
| 223 | |
| 224 | PyObject * |
| 225 | PyThreadState_GetDict() |
| 226 | { |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 227 | if (_PyThreadState_Current == NULL) |
Guido van Rossum | ede0439 | 1998-04-10 20:18:25 +0000 | [diff] [blame] | 228 | Py_FatalError("PyThreadState_GetDict: no current thread"); |
| 229 | |
Guido van Rossum | 18bc7c2 | 1998-12-21 18:27:28 +0000 | [diff] [blame] | 230 | if (_PyThreadState_Current->dict == NULL) |
| 231 | _PyThreadState_Current->dict = PyDict_New(); |
| 232 | return _PyThreadState_Current->dict; |
Guido van Rossum | ede0439 | 1998-04-10 20:18:25 +0000 | [diff] [blame] | 233 | } |