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1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | ||
42 | ||
43 | \f | |
44 | ||
45 | #include "libguile/validate.h" | |
46 | #include "libguile/root.h" | |
47 | #include "libguile/stackchk.h" | |
48 | #include "libguile/async.h" | |
64e00566 MV |
49 | #include <sys/time.h> |
50 | #include <sys/types.h> | |
51 | #include <time.h> | |
3d527b27 MV |
52 | |
53 | void *scm_null_threads_data; | |
54 | ||
55 | static SCM main_thread; | |
56 | ||
57 | void | |
58 | scm_threads_init (SCM_STACKITEM *i) | |
59 | { | |
60 | main_thread = scm_permanent_object (scm_cell (scm_tc16_thread, 0)); | |
61 | scm_null_threads_data = NULL; | |
62 | } | |
63 | ||
64 | #ifdef __ia64__ | |
65 | # define SCM_MARK_BACKING_STORE() do { \ | |
66 | ucontext_t ctx; \ | |
67 | SCM_STACKITEM * top, * bot; \ | |
68 | getcontext (&ctx); \ | |
69 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
70 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
71 | / sizeof (SCM_STACKITEM))); \ | |
72 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
73 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
74 | scm_mark_locations (bot, top - bot); } while (0) | |
75 | #else | |
76 | # define SCM_MARK_BACKING_STORE() | |
77 | #endif | |
78 | ||
79 | void | |
80 | scm_threads_mark_stacks (void) | |
81 | { | |
82 | /* Mark objects on the C stack. */ | |
83 | SCM_FLUSH_REGISTER_WINDOWS; | |
84 | /* This assumes that all registers are saved into the jmp_buf */ | |
85 | setjmp (scm_save_regs_gc_mark); | |
86 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
87 | ( (size_t) (sizeof (SCM_STACKITEM) - 1 + | |
88 | sizeof scm_save_regs_gc_mark) | |
89 | / sizeof (SCM_STACKITEM))); | |
90 | ||
91 | { | |
92 | unsigned long stack_len = scm_stack_size (scm_stack_base); | |
93 | #ifdef SCM_STACK_GROWS_UP | |
94 | scm_mark_locations (scm_stack_base, stack_len); | |
95 | #else | |
96 | scm_mark_locations (scm_stack_base - stack_len, stack_len); | |
97 | #endif | |
98 | } | |
99 | SCM_MARK_BACKING_STORE(); | |
100 | } | |
101 | ||
102 | SCM | |
103 | scm_call_with_new_thread (SCM argl) | |
104 | #define FUNC_NAME s_call_with_new_thread | |
105 | { | |
106 | SCM_MISC_ERROR ("threads are not supported in this version of Guile", | |
107 | SCM_EOL); | |
108 | return SCM_BOOL_F; | |
109 | } | |
110 | #undef FUNC_NAME | |
111 | ||
112 | SCM | |
113 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
114 | scm_t_catch_handler handler, void *handler_data) | |
115 | { | |
116 | scm_misc_error ("scm_spawn_thread", | |
117 | "threads are not supported in this version of Guile", | |
118 | SCM_EOL); | |
119 | return SCM_BOOL_F; | |
120 | } | |
121 | ||
122 | SCM | |
123 | scm_current_thread (void) | |
124 | { | |
125 | return main_thread; | |
126 | } | |
127 | ||
128 | SCM | |
129 | scm_all_threads (void) | |
130 | { | |
131 | return scm_list_1 (main_thread); | |
132 | } | |
133 | ||
134 | scm_root_state * | |
135 | scm_i_thread_root (SCM thread) | |
136 | { | |
137 | return (scm_root_state *)scm_null_threads_data; | |
138 | } | |
139 | ||
140 | SCM | |
141 | scm_join_thread (SCM thread) | |
142 | #define FUNC_NAME s_join_thread | |
143 | { | |
144 | SCM_MISC_ERROR ("threads are not supported in this version of Guile", | |
145 | SCM_EOL); | |
146 | return SCM_BOOL_F; | |
147 | } | |
148 | #undef FUNC_NAME | |
149 | ||
150 | SCM | |
151 | scm_yield (void) | |
152 | { | |
153 | return SCM_BOOL_T; | |
154 | } | |
155 | ||
156 | /* Block until a new async might have been queued. | |
157 | */ | |
158 | static void | |
159 | block () | |
160 | { | |
161 | select (0, NULL, NULL, NULL, NULL); | |
162 | } | |
163 | ||
164 | int | |
165 | scm_null_mutex_init (scm_null_mutex *m) | |
166 | { | |
167 | m->locked = 0; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | int | |
172 | scm_null_mutex_lock (scm_null_mutex *m) | |
173 | { | |
174 | while (m->locked) | |
175 | { | |
176 | block (); | |
177 | SCM_ASYNC_TICK; | |
178 | } | |
179 | m->locked = 1; | |
180 | return 1; | |
181 | } | |
182 | ||
183 | int | |
184 | scm_null_mutex_unlock (scm_null_mutex *m) | |
185 | { | |
186 | if (m->locked == 0) | |
187 | return 0; | |
188 | m->locked = 0; | |
189 | return 1; | |
190 | } | |
191 | ||
192 | int | |
193 | scm_null_mutex_destroy (scm_null_mutex *m) | |
194 | { | |
195 | return 1; | |
196 | } | |
197 | ||
198 | SCM | |
199 | scm_make_mutex (void) | |
200 | { | |
201 | SCM m = scm_make_smob (scm_tc16_mutex); | |
202 | scm_null_mutex_init (SCM_MUTEX_DATA(m)); | |
203 | return m; | |
204 | } | |
205 | ||
206 | SCM | |
207 | scm_lock_mutex (SCM m) | |
208 | { | |
209 | SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex); | |
210 | scm_null_mutex_lock (SCM_MUTEX_DATA(m)); | |
211 | return SCM_BOOL_T; | |
212 | } | |
213 | ||
214 | SCM | |
215 | scm_unlock_mutex (SCM m) | |
216 | { | |
217 | SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_unlock_mutex); | |
218 | if (!scm_null_mutex_unlock (SCM_MUTEX_DATA(m))) | |
219 | scm_misc_error (s_unlock_mutex, "mutex is not locked", SCM_EOL); | |
220 | return SCM_BOOL_T; | |
221 | } | |
222 | ||
223 | int | |
224 | scm_null_condvar_init (scm_null_condvar *c) | |
225 | { | |
226 | c->signalled = 0; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | int | |
231 | scm_null_condvar_wait (scm_null_condvar *c, scm_null_mutex *m) | |
232 | { | |
233 | scm_null_mutex_unlock (m); | |
234 | while (!c->signalled) | |
235 | { | |
236 | block (); | |
237 | SCM_ASYNC_TICK; | |
238 | } | |
239 | scm_null_mutex_lock (m); | |
240 | c->signalled = 0; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | int | |
245 | scm_null_condvar_signal (scm_null_condvar *c) | |
246 | { | |
247 | c->signalled = 1; | |
248 | return 0; | |
249 | } | |
250 | ||
251 | int | |
252 | scm_null_condvar_destroy (scm_null_condvar *c) | |
253 | { | |
254 | return 1; | |
255 | } | |
256 | ||
257 | SCM | |
258 | scm_make_condition_variable (void) | |
259 | { | |
260 | SCM c = scm_make_smob (scm_tc16_condvar); | |
261 | scm_null_condvar_init (SCM_CONDVAR_DATA (c)); | |
262 | return c; | |
263 | } | |
264 | ||
265 | SCM | |
266 | scm_wait_condition_variable (SCM c, SCM m) | |
267 | { | |
268 | SCM_ASSERT (SCM_CONDVARP (c), | |
269 | c, | |
270 | SCM_ARG1, | |
271 | s_wait_condition_variable); | |
272 | SCM_ASSERT (SCM_MUTEXP (m), | |
273 | m, | |
274 | SCM_ARG2, | |
275 | s_wait_condition_variable); | |
276 | scm_null_condvar_wait (SCM_CONDVAR_DATA (c), SCM_MUTEX_DATA (m)); | |
277 | return SCM_BOOL_T; | |
278 | } | |
279 | ||
280 | SCM | |
281 | scm_signal_condition_variable (SCM c) | |
282 | { | |
283 | SCM_ASSERT (SCM_CONDVARP (c), | |
284 | c, | |
285 | SCM_ARG1, | |
286 | s_signal_condition_variable); | |
287 | scm_null_condvar_signal (SCM_CONDVAR_DATA (c)); | |
288 | return SCM_BOOL_T; | |
289 | } | |
290 | ||
291 | unsigned long | |
292 | scm_thread_usleep (unsigned long usec) | |
293 | { | |
294 | struct timeval timeout; | |
295 | timeout.tv_sec = 0; | |
296 | timeout.tv_usec = usec; | |
297 | select (0, NULL, NULL, NULL, &timeout); | |
298 | return 0; /* Maybe we should calculate actual time slept, | |
299 | but this is faster... :) */ | |
300 | } | |
301 | ||
302 | unsigned long | |
303 | scm_thread_sleep (unsigned long sec) | |
304 | { | |
305 | time_t now = time (NULL); | |
306 | struct timeval timeout; | |
307 | unsigned long slept; | |
308 | timeout.tv_sec = sec; | |
309 | timeout.tv_usec = 0; | |
310 | select (0, NULL, NULL, NULL, &timeout); | |
311 | slept = time (NULL) - now; | |
312 | return slept > sec ? 0 : sec - slept; | |
313 | } | |
314 | ||
315 | /* | |
316 | Local Variables: | |
317 | c-file-style: "gnu" | |
318 | End: | |
319 | */ |