Commit | Line | Data |
---|---|---|
634aa8de | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2004, 2006, 2008 Free Software Foundation, Inc. |
843e4e9d | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
843e4e9d | 7 | * |
73be1d9e | 8 | * This library is distributed in the hope that it will be useful, |
0f2d19dd | 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
843e4e9d | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
dbb605f5 | 20 | #ifdef HAVE_CONFIG_H |
ef92a2a2 RB |
21 | # include <config.h> |
22 | #endif | |
0f2d19dd | 23 | |
0f2d19dd | 24 | #include <signal.h> |
a0599745 MD |
25 | #include "libguile/_scm.h" |
26 | #include "libguile/eval.h" | |
27 | #include "libguile/throw.h" | |
28 | #include "libguile/root.h" | |
29 | #include "libguile/smob.h" | |
c96d76b8 | 30 | #include "libguile/lang.h" |
e292f7aa | 31 | #include "libguile/dynwind.h" |
2d3179db | 32 | #include "libguile/deprecation.h" |
20e6290e | 33 | |
a0599745 MD |
34 | #include "libguile/validate.h" |
35 | #include "libguile/async.h" | |
0f2d19dd | 36 | |
95b88819 GH |
37 | #ifdef HAVE_STRING_H |
38 | #include <string.h> | |
39 | #endif | |
0f2d19dd JB |
40 | #ifdef HAVE_UNISTD_H |
41 | #include <unistd.h> | |
42 | #endif | |
43 | ||
634aa8de LC |
44 | #include <full-write.h> |
45 | ||
0f2d19dd JB |
46 | \f |
47 | /* {Asynchronous Events} | |
48 | * | |
2d3179db MV |
49 | * There are two kinds of asyncs: system asyncs and user asyncs. The |
50 | * two kinds have some concepts in commen but work slightly | |
51 | * differently and are not interchangeable. | |
0f2d19dd | 52 | * |
2d3179db MV |
53 | * System asyncs are used to run arbitrary code at the next safe point |
54 | * in a specified thread. You can use them to trigger execution of | |
55 | * Scheme code from signal handlers or to interrupt a thread, for | |
56 | * example. | |
0f2d19dd | 57 | * |
2d3179db MV |
58 | * Each thread has a list of 'activated asyncs', which is a normal |
59 | * Scheme list of procedures with zero arguments. When a thread | |
60 | * executes a SCM_ASYNC_TICK statement (which is included in | |
61 | * SCM_TICK), it will call all procedures on this list. | |
843e4e9d | 62 | * |
2d3179db MV |
63 | * Also, a thread will wake up when a procedure is added to its list |
64 | * of active asyncs and call them. After that, it will go to sleep | |
65 | * again. (Not implemented yet.) | |
0f2d19dd | 66 | * |
0f2d19dd | 67 | * |
2d3179db MV |
68 | * User asyncs are a little data structure that consists of a |
69 | * procedure of zero arguments and a mark. There are functions for | |
70 | * setting the mark of a user async and for calling all procedures of | |
71 | * marked asyncs in a given list. Nothing you couldn't quickly | |
72 | * implement yourself. | |
0f2d19dd JB |
73 | */ |
74 | ||
0f2d19dd | 75 | |
2d3179db | 76 | \f |
0f2d19dd | 77 | |
2d3179db | 78 | /* User asyncs. */ |
e94e3f21 | 79 | |
2d3179db | 80 | static scm_t_bits tc16_async; |
e94e3f21 ML |
81 | |
82 | /* cmm: this has SCM_ prefix because SCM_MAKE_VALIDATE expects it. | |
83 | this is ugly. */ | |
e841c3e0 | 84 | #define SCM_ASYNCP(X) SCM_TYP16_PREDICATE (tc16_async, X) |
6182ceac | 85 | #define VALIDATE_ASYNC(pos, a) SCM_MAKE_VALIDATE_MSG(pos, a, ASYNCP, "user async") |
e94e3f21 ML |
86 | |
87 | #define ASYNC_GOT_IT(X) (SCM_CELL_WORD_0 (X) >> 16) | |
d1ca2c64 | 88 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_CELL_WORD_0 ((X), SCM_TYP16 (X) | ((V) << 16))) |
e94e3f21 | 89 | #define ASYNC_THUNK(X) SCM_CELL_OBJECT_1 (X) |
0f2d19dd | 90 | |
0f2d19dd | 91 | static SCM |
2d3179db | 92 | async_gc_mark (SCM obj) |
0f2d19dd | 93 | { |
e94e3f21 | 94 | return ASYNC_THUNK (obj); |
0f2d19dd JB |
95 | } |
96 | ||
843e4e9d | 97 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
98 | (SCM thunk), |
99 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 100 | #define FUNC_NAME s_scm_async |
0f2d19dd | 101 | { |
e94e3f21 | 102 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 103 | } |
1bbd0b84 | 104 | #undef FUNC_NAME |
0f2d19dd | 105 | |
843e4e9d | 106 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 107 | (SCM a), |
811cf846 | 108 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 109 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 110 | { |
e94e3f21 | 111 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 112 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
113 | return SCM_UNSPECIFIED; |
114 | } | |
1bbd0b84 | 115 | #undef FUNC_NAME |
0f2d19dd | 116 | |
843e4e9d | 117 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
118 | (SCM list_of_a), |
119 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 120 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 121 | { |
c96d76b8 | 122 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
123 | { |
124 | SCM a; | |
9f0e55a6 | 125 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 126 | a = SCM_CAR (list_of_a); |
e94e3f21 | 127 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 128 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 129 | { |
e94e3f21 | 130 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 131 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 132 | } |
1bbd0b84 | 133 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
134 | } |
135 | return SCM_BOOL_T; | |
136 | } | |
1bbd0b84 | 137 | #undef FUNC_NAME |
0f2d19dd JB |
138 | |
139 | \f | |
140 | ||
9de87eea MV |
141 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
142 | ||
2d3179db | 143 | /* System asyncs. */ |
0f2d19dd | 144 | |
2d3179db MV |
145 | void |
146 | scm_async_click () | |
0f2d19dd | 147 | { |
9de87eea MV |
148 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
149 | SCM asyncs; | |
150 | ||
402858a4 | 151 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
152 | executed since this will avoid future futile calls to this |
153 | function. When asyncs are unblocked again, this function is | |
154 | invoked even when pending_asyncs is zero. | |
402858a4 | 155 | */ |
2d3179db | 156 | |
9de87eea MV |
157 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
158 | t->pending_asyncs = 0; | |
159 | if (t->block_asyncs == 0) | |
2d3179db | 160 | { |
9de87eea MV |
161 | asyncs = t->active_asyncs; |
162 | t->active_asyncs = SCM_EOL; | |
163 | } | |
164 | else | |
165 | asyncs = SCM_EOL; | |
166 | scm_i_pthread_mutex_unlock (&async_mutex); | |
167 | ||
168 | while (scm_is_pair (asyncs)) | |
169 | { | |
170 | SCM next = SCM_CDR (asyncs); | |
171 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
172 | scm_call_0 (SCM_CAR (asyncs)); | |
173 | asyncs = next; | |
2d3179db | 174 | } |
0f2d19dd JB |
175 | } |
176 | ||
100ae50d DH |
177 | #if (SCM_ENABLE_DEPRECATED == 1) |
178 | ||
2d3179db MV |
179 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
180 | (SCM thunk), | |
181 | "This function is deprecated. You can use @var{thunk} directly\n" | |
100ae50d | 182 | "instead of explicitely creating an async object.\n") |
2d3179db MV |
183 | #define FUNC_NAME s_scm_system_async |
184 | { | |
185 | scm_c_issue_deprecation_warning | |
186 | ("'system-async' is deprecated. " | |
187 | "Use the procedure directly with 'system-async-mark'."); | |
188 | return thunk; | |
189 | } | |
190 | #undef FUNC_NAME | |
0f2d19dd | 191 | |
100ae50d DH |
192 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
193 | ||
2d3179db | 194 | void |
9de87eea | 195 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 196 | { |
9de87eea MV |
197 | SCM sleep_object; |
198 | scm_i_pthread_mutex_t *sleep_mutex; | |
199 | int sleep_fd; | |
200 | SCM p; | |
201 | ||
202 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
203 | p = t->active_asyncs; | |
402858a4 | 204 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
205 | if (!scm_is_pair (p)) |
206 | t->active_asyncs = c; | |
402858a4 | 207 | else |
2d3179db | 208 | { |
402858a4 | 209 | SCM pp; |
9de87eea | 210 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 211 | { |
9de87eea MV |
212 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
213 | { | |
214 | scm_i_pthread_mutex_unlock (&async_mutex); | |
215 | return; | |
216 | } | |
402858a4 | 217 | p = pp; |
f6b44bd9 | 218 | } |
402858a4 | 219 | SCM_SETCDR (p, c); |
2d3179db | 220 | } |
9de87eea MV |
221 | t->pending_asyncs = 1; |
222 | sleep_object = t->sleep_object; | |
223 | sleep_mutex = t->sleep_mutex; | |
224 | sleep_fd = t->sleep_fd; | |
225 | scm_i_pthread_mutex_unlock (&async_mutex); | |
226 | ||
227 | if (sleep_mutex) | |
228 | { | |
229 | /* By now, the thread T might be out of its sleep already, or | |
230 | might even be in the next, unrelated sleep. Interrupting it | |
231 | anyway does no harm, however. | |
232 | ||
233 | The important thing to prevent here is to signal sleep_cond | |
234 | before T waits on it. This can not happen since T has | |
235 | sleep_mutex locked while setting t->sleep_mutex and will only | |
236 | unlock it again while waiting on sleep_cond. | |
237 | */ | |
238 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
239 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
240 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
241 | } | |
242 | ||
243 | if (sleep_fd >= 0) | |
244 | { | |
245 | char dummy = 0; | |
634aa8de | 246 | |
9de87eea MV |
247 | /* Likewise, T might already been done with sleeping here, but |
248 | interrupting it once too often does no harm. T might also | |
249 | not yet have started sleeping, but this is no problem either | |
250 | since the data written to a pipe will not be lost, unlike a | |
634aa8de LC |
251 | condition variable signal. */ |
252 | full_write (sleep_fd, &dummy, 1); | |
9de87eea MV |
253 | } |
254 | ||
255 | /* This is needed to protect sleep_mutex. | |
256 | */ | |
257 | scm_remember_upto_here_1 (sleep_object); | |
258 | } | |
259 | ||
260 | int | |
261 | scm_i_setup_sleep (scm_i_thread *t, | |
262 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
263 | int sleep_fd) | |
264 | { | |
265 | int pending; | |
266 | ||
267 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
268 | pending = t->pending_asyncs; | |
269 | if (!pending) | |
270 | { | |
271 | t->sleep_object = sleep_object; | |
272 | t->sleep_mutex = sleep_mutex; | |
273 | t->sleep_fd = sleep_fd; | |
274 | } | |
275 | scm_i_pthread_mutex_unlock (&async_mutex); | |
276 | return pending; | |
277 | } | |
278 | ||
279 | void | |
280 | scm_i_reset_sleep (scm_i_thread *t) | |
281 | { | |
282 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
283 | t->sleep_object = SCM_BOOL_F; | |
284 | t->sleep_mutex = NULL; | |
285 | t->sleep_fd = -1; | |
286 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 287 | } |
0f2d19dd | 288 | |
2d3179db MV |
289 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
290 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
291 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
292 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
293 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
294 | "If @var{thread} is omitted, the thread that called\n" | |
295 | "@code{system-async-mark} is used.\n\n" | |
296 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
297 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
298 | "signal handlers.") | |
2d3179db MV |
299 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
300 | { | |
9de87eea MV |
301 | /* The current thread might not have a handle yet. This can happen |
302 | when the GC runs immediately before allocating the handle. At | |
303 | the end of that GC, a system async might be marked. Thus, we can | |
304 | not use scm_current_thread here. | |
305 | */ | |
306 | ||
307 | scm_i_thread *t; | |
308 | ||
028e573c | 309 | if (SCM_UNBNDP (thread)) |
9de87eea | 310 | t = SCM_I_CURRENT_THREAD; |
028e573c | 311 | else |
402858a4 MV |
312 | { |
313 | SCM_VALIDATE_THREAD (2, thread); | |
314 | if (scm_c_thread_exited_p (thread)) | |
315 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 316 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 317 | } |
9de87eea | 318 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
319 | return SCM_UNSPECIFIED; |
320 | } | |
321 | #undef FUNC_NAME | |
9f0e55a6 | 322 | |
2d3179db MV |
323 | SCM |
324 | scm_system_async_mark (SCM proc) | |
325 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 326 | { |
2d3179db | 327 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 328 | } |
1bbd0b84 | 329 | #undef FUNC_NAME |
0f2d19dd JB |
330 | |
331 | \f | |
332 | ||
333 | ||
2d3179db MV |
334 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
335 | (SCM args), | |
336 | "Do nothing. When called without arguments, return @code{#f},\n" | |
337 | "otherwise return the first argument.") | |
338 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 339 | { |
2d3179db MV |
340 | SCM_VALIDATE_REST_ARGUMENT (args); |
341 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 342 | } |
1bbd0b84 | 343 | #undef FUNC_NAME |
0f2d19dd | 344 | |
0f2d19dd | 345 | |
0f2d19dd JB |
346 | \f |
347 | ||
100ae50d | 348 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 349 | |
843e4e9d | 350 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
351 | (), |
352 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 353 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 354 | { |
9de87eea MV |
355 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
356 | ||
e292f7aa MV |
357 | scm_c_issue_deprecation_warning |
358 | ("'unmask-signals' is deprecated. " | |
359 | "Use 'call-with-blocked-asyncs' instead."); | |
360 | ||
9de87eea | 361 | if (t->block_asyncs == 0) |
e292f7aa | 362 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 363 | t->block_asyncs = 0; |
402858a4 | 364 | scm_async_click (); |
0f2d19dd JB |
365 | return SCM_UNSPECIFIED; |
366 | } | |
1bbd0b84 | 367 | #undef FUNC_NAME |
0f2d19dd JB |
368 | |
369 | ||
843e4e9d | 370 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
371 | (), |
372 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 373 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 374 | { |
9de87eea MV |
375 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
376 | ||
e292f7aa MV |
377 | scm_c_issue_deprecation_warning |
378 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
379 | ||
9de87eea | 380 | if (t->block_asyncs > 0) |
e292f7aa | 381 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 382 | t->block_asyncs = 1; |
0f2d19dd JB |
383 | return SCM_UNSPECIFIED; |
384 | } | |
1bbd0b84 | 385 | #undef FUNC_NAME |
0f2d19dd | 386 | |
100ae50d | 387 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
388 | |
389 | static void | |
9de87eea | 390 | increase_block (void *data) |
e292f7aa | 391 | { |
9de87eea | 392 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
393 | } |
394 | ||
395 | static void | |
9de87eea | 396 | decrease_block (void *data) |
e292f7aa | 397 | { |
9de87eea | 398 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 399 | scm_async_click (); |
e292f7aa MV |
400 | } |
401 | ||
402 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
403 | (SCM proc), | |
404 | "Call @var{proc} with no arguments and block the execution\n" | |
405 | "of system asyncs by one level for the current thread while\n" | |
406 | "it is running. Return the value returned by @var{proc}.\n") | |
407 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
408 | { | |
409 | return scm_internal_dynamic_wind (increase_block, | |
410 | (scm_t_inner) scm_call_0, | |
411 | decrease_block, | |
9de87eea MV |
412 | (void *)proc, |
413 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
414 | } |
415 | #undef FUNC_NAME | |
416 | ||
417 | void * | |
418 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
419 | { | |
402858a4 MV |
420 | return (void *)scm_internal_dynamic_wind (increase_block, |
421 | (scm_t_inner) proc, | |
422 | decrease_block, | |
9de87eea MV |
423 | data, |
424 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
425 | } |
426 | ||
427 | ||
428 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
429 | (SCM proc), | |
430 | "Call @var{proc} with no arguments and unblock the execution\n" | |
431 | "of system asyncs by one level for the current thread while\n" | |
432 | "it is running. Return the value returned by @var{proc}.\n") | |
433 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
434 | { | |
9de87eea | 435 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
436 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
437 | return scm_internal_dynamic_wind (decrease_block, | |
438 | (scm_t_inner) scm_call_0, | |
439 | increase_block, | |
9de87eea MV |
440 | (void *)proc, |
441 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
442 | } |
443 | #undef FUNC_NAME | |
444 | ||
445 | void * | |
446 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
447 | { | |
9de87eea | 448 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
449 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
450 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
451 | return (void *)scm_internal_dynamic_wind (decrease_block, |
452 | (scm_t_inner) proc, | |
453 | increase_block, | |
9de87eea MV |
454 | data, |
455 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
456 | } |
457 | ||
b57a0953 | 458 | void |
661ae7ab | 459 | scm_dynwind_block_asyncs () |
b57a0953 | 460 | { |
9de87eea | 461 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
661ae7ab MV |
462 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); |
463 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
464 | } |
465 | ||
466 | void | |
661ae7ab | 467 | scm_dynwind_unblock_asyncs () |
b57a0953 | 468 | { |
9de87eea MV |
469 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
470 | if (t->block_asyncs == 0) | |
b57a0953 MV |
471 | scm_misc_error ("scm_with_unblocked_asyncs", |
472 | "asyncs already unblocked", SCM_EOL); | |
661ae7ab MV |
473 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
474 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
475 | } |
476 | ||
477 | ||
0f2d19dd JB |
478 | \f |
479 | ||
0f2d19dd JB |
480 | void |
481 | scm_init_async () | |
0f2d19dd | 482 | { |
939794ce | 483 | scm_asyncs = SCM_EOL; |
73ea78af | 484 | tc16_async = scm_make_smob_type ("async", 0); |
2d3179db | 485 | scm_set_smob_mark (tc16_async, async_gc_mark); |
73ea78af | 486 | |
a0599745 | 487 | #include "libguile/async.x" |
0f2d19dd | 488 | } |
89e00824 ML |
489 | |
490 | /* | |
491 | Local Variables: | |
492 | c-file-style: "gnu" | |
493 | End: | |
494 | */ |