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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 | |
843e4e9d | 92 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
93 | (SCM thunk), |
94 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 95 | #define FUNC_NAME s_scm_async |
0f2d19dd | 96 | { |
e94e3f21 | 97 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 98 | } |
1bbd0b84 | 99 | #undef FUNC_NAME |
0f2d19dd | 100 | |
843e4e9d | 101 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 102 | (SCM a), |
811cf846 | 103 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 104 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 105 | { |
e94e3f21 | 106 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 107 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
108 | return SCM_UNSPECIFIED; |
109 | } | |
1bbd0b84 | 110 | #undef FUNC_NAME |
0f2d19dd | 111 | |
843e4e9d | 112 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
113 | (SCM list_of_a), |
114 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 115 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 116 | { |
c96d76b8 | 117 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
118 | { |
119 | SCM a; | |
9f0e55a6 | 120 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 121 | a = SCM_CAR (list_of_a); |
e94e3f21 | 122 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 123 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 124 | { |
e94e3f21 | 125 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 126 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 127 | } |
1bbd0b84 | 128 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
129 | } |
130 | return SCM_BOOL_T; | |
131 | } | |
1bbd0b84 | 132 | #undef FUNC_NAME |
0f2d19dd JB |
133 | |
134 | \f | |
135 | ||
9de87eea MV |
136 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
137 | ||
2d3179db | 138 | /* System asyncs. */ |
0f2d19dd | 139 | |
2d3179db MV |
140 | void |
141 | scm_async_click () | |
0f2d19dd | 142 | { |
9de87eea MV |
143 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
144 | SCM asyncs; | |
145 | ||
402858a4 | 146 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
147 | executed since this will avoid future futile calls to this |
148 | function. When asyncs are unblocked again, this function is | |
149 | invoked even when pending_asyncs is zero. | |
402858a4 | 150 | */ |
2d3179db | 151 | |
9de87eea MV |
152 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
153 | t->pending_asyncs = 0; | |
154 | if (t->block_asyncs == 0) | |
2d3179db | 155 | { |
9de87eea MV |
156 | asyncs = t->active_asyncs; |
157 | t->active_asyncs = SCM_EOL; | |
158 | } | |
159 | else | |
160 | asyncs = SCM_EOL; | |
161 | scm_i_pthread_mutex_unlock (&async_mutex); | |
162 | ||
163 | while (scm_is_pair (asyncs)) | |
164 | { | |
165 | SCM next = SCM_CDR (asyncs); | |
166 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
167 | scm_call_0 (SCM_CAR (asyncs)); | |
168 | asyncs = next; | |
2d3179db | 169 | } |
0f2d19dd JB |
170 | } |
171 | ||
100ae50d DH |
172 | #if (SCM_ENABLE_DEPRECATED == 1) |
173 | ||
2d3179db MV |
174 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
175 | (SCM thunk), | |
176 | "This function is deprecated. You can use @var{thunk} directly\n" | |
100ae50d | 177 | "instead of explicitely creating an async object.\n") |
2d3179db MV |
178 | #define FUNC_NAME s_scm_system_async |
179 | { | |
180 | scm_c_issue_deprecation_warning | |
181 | ("'system-async' is deprecated. " | |
182 | "Use the procedure directly with 'system-async-mark'."); | |
183 | return thunk; | |
184 | } | |
185 | #undef FUNC_NAME | |
0f2d19dd | 186 | |
100ae50d DH |
187 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
188 | ||
2d3179db | 189 | void |
9de87eea | 190 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 191 | { |
9de87eea MV |
192 | SCM sleep_object; |
193 | scm_i_pthread_mutex_t *sleep_mutex; | |
194 | int sleep_fd; | |
195 | SCM p; | |
196 | ||
197 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
198 | p = t->active_asyncs; | |
402858a4 | 199 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
200 | if (!scm_is_pair (p)) |
201 | t->active_asyncs = c; | |
402858a4 | 202 | else |
2d3179db | 203 | { |
402858a4 | 204 | SCM pp; |
9de87eea | 205 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 206 | { |
9de87eea MV |
207 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
208 | { | |
209 | scm_i_pthread_mutex_unlock (&async_mutex); | |
210 | return; | |
211 | } | |
402858a4 | 212 | p = pp; |
f6b44bd9 | 213 | } |
402858a4 | 214 | SCM_SETCDR (p, c); |
2d3179db | 215 | } |
9de87eea MV |
216 | t->pending_asyncs = 1; |
217 | sleep_object = t->sleep_object; | |
218 | sleep_mutex = t->sleep_mutex; | |
219 | sleep_fd = t->sleep_fd; | |
220 | scm_i_pthread_mutex_unlock (&async_mutex); | |
221 | ||
222 | if (sleep_mutex) | |
223 | { | |
224 | /* By now, the thread T might be out of its sleep already, or | |
225 | might even be in the next, unrelated sleep. Interrupting it | |
226 | anyway does no harm, however. | |
227 | ||
228 | The important thing to prevent here is to signal sleep_cond | |
229 | before T waits on it. This can not happen since T has | |
230 | sleep_mutex locked while setting t->sleep_mutex and will only | |
231 | unlock it again while waiting on sleep_cond. | |
232 | */ | |
233 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
234 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
235 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
236 | } | |
237 | ||
238 | if (sleep_fd >= 0) | |
239 | { | |
240 | char dummy = 0; | |
634aa8de | 241 | |
9de87eea MV |
242 | /* Likewise, T might already been done with sleeping here, but |
243 | interrupting it once too often does no harm. T might also | |
244 | not yet have started sleeping, but this is no problem either | |
245 | since the data written to a pipe will not be lost, unlike a | |
634aa8de LC |
246 | condition variable signal. */ |
247 | full_write (sleep_fd, &dummy, 1); | |
9de87eea MV |
248 | } |
249 | ||
250 | /* This is needed to protect sleep_mutex. | |
251 | */ | |
252 | scm_remember_upto_here_1 (sleep_object); | |
253 | } | |
254 | ||
255 | int | |
256 | scm_i_setup_sleep (scm_i_thread *t, | |
257 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
258 | int sleep_fd) | |
259 | { | |
260 | int pending; | |
261 | ||
262 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
263 | pending = t->pending_asyncs; | |
264 | if (!pending) | |
265 | { | |
266 | t->sleep_object = sleep_object; | |
267 | t->sleep_mutex = sleep_mutex; | |
268 | t->sleep_fd = sleep_fd; | |
269 | } | |
270 | scm_i_pthread_mutex_unlock (&async_mutex); | |
271 | return pending; | |
272 | } | |
273 | ||
274 | void | |
275 | scm_i_reset_sleep (scm_i_thread *t) | |
276 | { | |
277 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
278 | t->sleep_object = SCM_BOOL_F; | |
279 | t->sleep_mutex = NULL; | |
280 | t->sleep_fd = -1; | |
281 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 282 | } |
0f2d19dd | 283 | |
2d3179db MV |
284 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
285 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
286 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
287 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
288 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
289 | "If @var{thread} is omitted, the thread that called\n" | |
290 | "@code{system-async-mark} is used.\n\n" | |
291 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
292 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
293 | "signal handlers.") | |
2d3179db MV |
294 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
295 | { | |
9de87eea MV |
296 | /* The current thread might not have a handle yet. This can happen |
297 | when the GC runs immediately before allocating the handle. At | |
298 | the end of that GC, a system async might be marked. Thus, we can | |
299 | not use scm_current_thread here. | |
300 | */ | |
301 | ||
302 | scm_i_thread *t; | |
303 | ||
028e573c | 304 | if (SCM_UNBNDP (thread)) |
9de87eea | 305 | t = SCM_I_CURRENT_THREAD; |
028e573c | 306 | else |
402858a4 MV |
307 | { |
308 | SCM_VALIDATE_THREAD (2, thread); | |
309 | if (scm_c_thread_exited_p (thread)) | |
310 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 311 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 312 | } |
9de87eea | 313 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
314 | return SCM_UNSPECIFIED; |
315 | } | |
316 | #undef FUNC_NAME | |
9f0e55a6 | 317 | |
2d3179db MV |
318 | SCM |
319 | scm_system_async_mark (SCM proc) | |
320 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 321 | { |
2d3179db | 322 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 323 | } |
1bbd0b84 | 324 | #undef FUNC_NAME |
0f2d19dd JB |
325 | |
326 | \f | |
327 | ||
328 | ||
2d3179db MV |
329 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
330 | (SCM args), | |
331 | "Do nothing. When called without arguments, return @code{#f},\n" | |
332 | "otherwise return the first argument.") | |
333 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 334 | { |
2d3179db MV |
335 | SCM_VALIDATE_REST_ARGUMENT (args); |
336 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 337 | } |
1bbd0b84 | 338 | #undef FUNC_NAME |
0f2d19dd | 339 | |
0f2d19dd | 340 | |
0f2d19dd JB |
341 | \f |
342 | ||
100ae50d | 343 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 344 | |
843e4e9d | 345 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
346 | (), |
347 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 348 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 349 | { |
9de87eea MV |
350 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
351 | ||
e292f7aa MV |
352 | scm_c_issue_deprecation_warning |
353 | ("'unmask-signals' is deprecated. " | |
354 | "Use 'call-with-blocked-asyncs' instead."); | |
355 | ||
9de87eea | 356 | if (t->block_asyncs == 0) |
e292f7aa | 357 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 358 | t->block_asyncs = 0; |
402858a4 | 359 | scm_async_click (); |
0f2d19dd JB |
360 | return SCM_UNSPECIFIED; |
361 | } | |
1bbd0b84 | 362 | #undef FUNC_NAME |
0f2d19dd JB |
363 | |
364 | ||
843e4e9d | 365 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
366 | (), |
367 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 368 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 369 | { |
9de87eea MV |
370 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
371 | ||
e292f7aa MV |
372 | scm_c_issue_deprecation_warning |
373 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
374 | ||
9de87eea | 375 | if (t->block_asyncs > 0) |
e292f7aa | 376 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 377 | t->block_asyncs = 1; |
0f2d19dd JB |
378 | return SCM_UNSPECIFIED; |
379 | } | |
1bbd0b84 | 380 | #undef FUNC_NAME |
0f2d19dd | 381 | |
100ae50d | 382 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
383 | |
384 | static void | |
9de87eea | 385 | increase_block (void *data) |
e292f7aa | 386 | { |
9de87eea | 387 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
388 | } |
389 | ||
390 | static void | |
9de87eea | 391 | decrease_block (void *data) |
e292f7aa | 392 | { |
9de87eea | 393 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 394 | scm_async_click (); |
e292f7aa MV |
395 | } |
396 | ||
397 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
398 | (SCM proc), | |
399 | "Call @var{proc} with no arguments and block the execution\n" | |
400 | "of system asyncs by one level for the current thread while\n" | |
401 | "it is running. Return the value returned by @var{proc}.\n") | |
402 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
403 | { | |
404 | return scm_internal_dynamic_wind (increase_block, | |
405 | (scm_t_inner) scm_call_0, | |
406 | decrease_block, | |
9de87eea MV |
407 | (void *)proc, |
408 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
409 | } |
410 | #undef FUNC_NAME | |
411 | ||
412 | void * | |
413 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
414 | { | |
402858a4 MV |
415 | return (void *)scm_internal_dynamic_wind (increase_block, |
416 | (scm_t_inner) proc, | |
417 | decrease_block, | |
9de87eea MV |
418 | data, |
419 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
420 | } |
421 | ||
422 | ||
423 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
424 | (SCM proc), | |
425 | "Call @var{proc} with no arguments and unblock the execution\n" | |
426 | "of system asyncs by one level for the current thread while\n" | |
427 | "it is running. Return the value returned by @var{proc}.\n") | |
428 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
429 | { | |
9de87eea | 430 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
431 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
432 | return scm_internal_dynamic_wind (decrease_block, | |
433 | (scm_t_inner) scm_call_0, | |
434 | increase_block, | |
9de87eea MV |
435 | (void *)proc, |
436 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
437 | } |
438 | #undef FUNC_NAME | |
439 | ||
440 | void * | |
441 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
442 | { | |
9de87eea | 443 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
444 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
445 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
446 | return (void *)scm_internal_dynamic_wind (decrease_block, |
447 | (scm_t_inner) proc, | |
448 | increase_block, | |
9de87eea MV |
449 | data, |
450 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
451 | } |
452 | ||
b57a0953 | 453 | void |
661ae7ab | 454 | scm_dynwind_block_asyncs () |
b57a0953 | 455 | { |
9de87eea | 456 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
661ae7ab MV |
457 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); |
458 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
459 | } |
460 | ||
461 | void | |
661ae7ab | 462 | scm_dynwind_unblock_asyncs () |
b57a0953 | 463 | { |
9de87eea MV |
464 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
465 | if (t->block_asyncs == 0) | |
b57a0953 MV |
466 | scm_misc_error ("scm_with_unblocked_asyncs", |
467 | "asyncs already unblocked", SCM_EOL); | |
661ae7ab MV |
468 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
469 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
470 | } |
471 | ||
472 | ||
0f2d19dd JB |
473 | \f |
474 | ||
0f2d19dd JB |
475 | void |
476 | scm_init_async () | |
0f2d19dd | 477 | { |
939794ce | 478 | scm_asyncs = SCM_EOL; |
73ea78af | 479 | tc16_async = scm_make_smob_type ("async", 0); |
73ea78af | 480 | |
a0599745 | 481 | #include "libguile/async.x" |
0f2d19dd | 482 | } |
89e00824 ML |
483 | |
484 | /* | |
485 | Local Variables: | |
486 | c-file-style: "gnu" | |
487 | End: | |
488 | */ |