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2b829bbb | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2004, 2006 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 |
ef92a2a2 RB |
20 | #if HAVE_CONFIG_H |
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 | ||
0f2d19dd JB |
44 | \f |
45 | /* {Asynchronous Events} | |
46 | * | |
2d3179db MV |
47 | * There are two kinds of asyncs: system asyncs and user asyncs. The |
48 | * two kinds have some concepts in commen but work slightly | |
49 | * differently and are not interchangeable. | |
0f2d19dd | 50 | * |
2d3179db MV |
51 | * System asyncs are used to run arbitrary code at the next safe point |
52 | * in a specified thread. You can use them to trigger execution of | |
53 | * Scheme code from signal handlers or to interrupt a thread, for | |
54 | * example. | |
0f2d19dd | 55 | * |
2d3179db MV |
56 | * Each thread has a list of 'activated asyncs', which is a normal |
57 | * Scheme list of procedures with zero arguments. When a thread | |
58 | * executes a SCM_ASYNC_TICK statement (which is included in | |
59 | * SCM_TICK), it will call all procedures on this list. | |
843e4e9d | 60 | * |
2d3179db MV |
61 | * Also, a thread will wake up when a procedure is added to its list |
62 | * of active asyncs and call them. After that, it will go to sleep | |
63 | * again. (Not implemented yet.) | |
0f2d19dd | 64 | * |
0f2d19dd | 65 | * |
2d3179db MV |
66 | * User asyncs are a little data structure that consists of a |
67 | * procedure of zero arguments and a mark. There are functions for | |
68 | * setting the mark of a user async and for calling all procedures of | |
69 | * marked asyncs in a given list. Nothing you couldn't quickly | |
70 | * implement yourself. | |
0f2d19dd JB |
71 | */ |
72 | ||
0f2d19dd | 73 | |
2d3179db | 74 | \f |
0f2d19dd | 75 | |
2d3179db | 76 | /* User asyncs. */ |
e94e3f21 | 77 | |
2d3179db | 78 | static scm_t_bits tc16_async; |
e94e3f21 ML |
79 | |
80 | /* cmm: this has SCM_ prefix because SCM_MAKE_VALIDATE expects it. | |
81 | this is ugly. */ | |
e841c3e0 | 82 | #define SCM_ASYNCP(X) SCM_TYP16_PREDICATE (tc16_async, X) |
6182ceac | 83 | #define VALIDATE_ASYNC(pos, a) SCM_MAKE_VALIDATE_MSG(pos, a, ASYNCP, "user async") |
e94e3f21 ML |
84 | |
85 | #define ASYNC_GOT_IT(X) (SCM_CELL_WORD_0 (X) >> 16) | |
d1ca2c64 | 86 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_CELL_WORD_0 ((X), SCM_TYP16 (X) | ((V) << 16))) |
e94e3f21 | 87 | #define ASYNC_THUNK(X) SCM_CELL_OBJECT_1 (X) |
0f2d19dd | 88 | |
0f2d19dd | 89 | |
843e4e9d | 90 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
91 | (SCM thunk), |
92 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 93 | #define FUNC_NAME s_scm_async |
0f2d19dd | 94 | { |
e94e3f21 | 95 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 96 | } |
1bbd0b84 | 97 | #undef FUNC_NAME |
0f2d19dd | 98 | |
843e4e9d | 99 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 100 | (SCM a), |
811cf846 | 101 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 102 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 103 | { |
e94e3f21 | 104 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 105 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
106 | return SCM_UNSPECIFIED; |
107 | } | |
1bbd0b84 | 108 | #undef FUNC_NAME |
0f2d19dd | 109 | |
843e4e9d | 110 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
111 | (SCM list_of_a), |
112 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 113 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 114 | { |
c96d76b8 | 115 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
116 | { |
117 | SCM a; | |
9f0e55a6 | 118 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 119 | a = SCM_CAR (list_of_a); |
e94e3f21 | 120 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 121 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 122 | { |
e94e3f21 | 123 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 124 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 125 | } |
1bbd0b84 | 126 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
127 | } |
128 | return SCM_BOOL_T; | |
129 | } | |
1bbd0b84 | 130 | #undef FUNC_NAME |
0f2d19dd JB |
131 | |
132 | \f | |
133 | ||
9de87eea MV |
134 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
135 | ||
2d3179db | 136 | /* System asyncs. */ |
0f2d19dd | 137 | |
2d3179db MV |
138 | void |
139 | scm_async_click () | |
0f2d19dd | 140 | { |
9de87eea MV |
141 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
142 | SCM asyncs; | |
143 | ||
402858a4 | 144 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
145 | executed since this will avoid future futile calls to this |
146 | function. When asyncs are unblocked again, this function is | |
147 | invoked even when pending_asyncs is zero. | |
402858a4 | 148 | */ |
2d3179db | 149 | |
9de87eea MV |
150 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
151 | t->pending_asyncs = 0; | |
152 | if (t->block_asyncs == 0) | |
2d3179db | 153 | { |
9de87eea MV |
154 | asyncs = t->active_asyncs; |
155 | t->active_asyncs = SCM_EOL; | |
156 | } | |
157 | else | |
158 | asyncs = SCM_EOL; | |
159 | scm_i_pthread_mutex_unlock (&async_mutex); | |
160 | ||
161 | while (scm_is_pair (asyncs)) | |
162 | { | |
163 | SCM next = SCM_CDR (asyncs); | |
164 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
165 | scm_call_0 (SCM_CAR (asyncs)); | |
166 | asyncs = next; | |
2d3179db | 167 | } |
0f2d19dd JB |
168 | } |
169 | ||
100ae50d DH |
170 | #if (SCM_ENABLE_DEPRECATED == 1) |
171 | ||
2d3179db MV |
172 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
173 | (SCM thunk), | |
174 | "This function is deprecated. You can use @var{thunk} directly\n" | |
100ae50d | 175 | "instead of explicitely creating an async object.\n") |
2d3179db MV |
176 | #define FUNC_NAME s_scm_system_async |
177 | { | |
178 | scm_c_issue_deprecation_warning | |
179 | ("'system-async' is deprecated. " | |
180 | "Use the procedure directly with 'system-async-mark'."); | |
181 | return thunk; | |
182 | } | |
183 | #undef FUNC_NAME | |
0f2d19dd | 184 | |
100ae50d DH |
185 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
186 | ||
2d3179db | 187 | void |
9de87eea | 188 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 189 | { |
9de87eea MV |
190 | SCM sleep_object; |
191 | scm_i_pthread_mutex_t *sleep_mutex; | |
192 | int sleep_fd; | |
193 | SCM p; | |
194 | ||
195 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
196 | p = t->active_asyncs; | |
402858a4 | 197 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
198 | if (!scm_is_pair (p)) |
199 | t->active_asyncs = c; | |
402858a4 | 200 | else |
2d3179db | 201 | { |
402858a4 | 202 | SCM pp; |
9de87eea | 203 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 204 | { |
9de87eea MV |
205 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
206 | { | |
207 | scm_i_pthread_mutex_unlock (&async_mutex); | |
208 | return; | |
209 | } | |
402858a4 | 210 | p = pp; |
f6b44bd9 | 211 | } |
402858a4 | 212 | SCM_SETCDR (p, c); |
2d3179db | 213 | } |
9de87eea MV |
214 | t->pending_asyncs = 1; |
215 | sleep_object = t->sleep_object; | |
216 | sleep_mutex = t->sleep_mutex; | |
217 | sleep_fd = t->sleep_fd; | |
218 | scm_i_pthread_mutex_unlock (&async_mutex); | |
219 | ||
220 | if (sleep_mutex) | |
221 | { | |
222 | /* By now, the thread T might be out of its sleep already, or | |
223 | might even be in the next, unrelated sleep. Interrupting it | |
224 | anyway does no harm, however. | |
225 | ||
226 | The important thing to prevent here is to signal sleep_cond | |
227 | before T waits on it. This can not happen since T has | |
228 | sleep_mutex locked while setting t->sleep_mutex and will only | |
229 | unlock it again while waiting on sleep_cond. | |
230 | */ | |
231 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
232 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
233 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
234 | } | |
235 | ||
236 | if (sleep_fd >= 0) | |
237 | { | |
238 | char dummy = 0; | |
239 | /* Likewise, T might already been done with sleeping here, but | |
240 | interrupting it once too often does no harm. T might also | |
241 | not yet have started sleeping, but this is no problem either | |
242 | since the data written to a pipe will not be lost, unlike a | |
243 | condition variable signal. | |
244 | */ | |
245 | write (sleep_fd, &dummy, 1); | |
246 | } | |
247 | ||
248 | /* This is needed to protect sleep_mutex. | |
249 | */ | |
250 | scm_remember_upto_here_1 (sleep_object); | |
251 | } | |
252 | ||
253 | int | |
254 | scm_i_setup_sleep (scm_i_thread *t, | |
255 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
256 | int sleep_fd) | |
257 | { | |
258 | int pending; | |
259 | ||
260 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
261 | pending = t->pending_asyncs; | |
262 | if (!pending) | |
263 | { | |
264 | t->sleep_object = sleep_object; | |
265 | t->sleep_mutex = sleep_mutex; | |
266 | t->sleep_fd = sleep_fd; | |
267 | } | |
268 | scm_i_pthread_mutex_unlock (&async_mutex); | |
269 | return pending; | |
270 | } | |
271 | ||
272 | void | |
273 | scm_i_reset_sleep (scm_i_thread *t) | |
274 | { | |
275 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
276 | t->sleep_object = SCM_BOOL_F; | |
277 | t->sleep_mutex = NULL; | |
278 | t->sleep_fd = -1; | |
279 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 280 | } |
0f2d19dd | 281 | |
2d3179db MV |
282 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
283 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
284 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
285 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
286 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
287 | "If @var{thread} is omitted, the thread that called\n" | |
288 | "@code{system-async-mark} is used.\n\n" | |
289 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
290 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
291 | "signal handlers.") | |
2d3179db MV |
292 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
293 | { | |
9de87eea MV |
294 | /* The current thread might not have a handle yet. This can happen |
295 | when the GC runs immediately before allocating the handle. At | |
296 | the end of that GC, a system async might be marked. Thus, we can | |
297 | not use scm_current_thread here. | |
298 | */ | |
299 | ||
300 | scm_i_thread *t; | |
301 | ||
028e573c | 302 | if (SCM_UNBNDP (thread)) |
9de87eea | 303 | t = SCM_I_CURRENT_THREAD; |
028e573c | 304 | else |
402858a4 MV |
305 | { |
306 | SCM_VALIDATE_THREAD (2, thread); | |
307 | if (scm_c_thread_exited_p (thread)) | |
308 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 309 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 310 | } |
9de87eea | 311 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
312 | return SCM_UNSPECIFIED; |
313 | } | |
314 | #undef FUNC_NAME | |
9f0e55a6 | 315 | |
2d3179db MV |
316 | SCM |
317 | scm_system_async_mark (SCM proc) | |
318 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 319 | { |
2d3179db | 320 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 321 | } |
1bbd0b84 | 322 | #undef FUNC_NAME |
0f2d19dd JB |
323 | |
324 | \f | |
325 | ||
326 | ||
2d3179db MV |
327 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
328 | (SCM args), | |
329 | "Do nothing. When called without arguments, return @code{#f},\n" | |
330 | "otherwise return the first argument.") | |
331 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 332 | { |
2d3179db MV |
333 | SCM_VALIDATE_REST_ARGUMENT (args); |
334 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 335 | } |
1bbd0b84 | 336 | #undef FUNC_NAME |
0f2d19dd | 337 | |
0f2d19dd | 338 | |
0f2d19dd JB |
339 | \f |
340 | ||
100ae50d | 341 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 342 | |
843e4e9d | 343 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
344 | (), |
345 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 346 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 347 | { |
9de87eea MV |
348 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
349 | ||
e292f7aa MV |
350 | scm_c_issue_deprecation_warning |
351 | ("'unmask-signals' is deprecated. " | |
352 | "Use 'call-with-blocked-asyncs' instead."); | |
353 | ||
9de87eea | 354 | if (t->block_asyncs == 0) |
e292f7aa | 355 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 356 | t->block_asyncs = 0; |
402858a4 | 357 | scm_async_click (); |
0f2d19dd JB |
358 | return SCM_UNSPECIFIED; |
359 | } | |
1bbd0b84 | 360 | #undef FUNC_NAME |
0f2d19dd JB |
361 | |
362 | ||
843e4e9d | 363 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
364 | (), |
365 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 366 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 367 | { |
9de87eea MV |
368 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
369 | ||
e292f7aa MV |
370 | scm_c_issue_deprecation_warning |
371 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
372 | ||
9de87eea | 373 | if (t->block_asyncs > 0) |
e292f7aa | 374 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 375 | t->block_asyncs = 1; |
0f2d19dd JB |
376 | return SCM_UNSPECIFIED; |
377 | } | |
1bbd0b84 | 378 | #undef FUNC_NAME |
0f2d19dd | 379 | |
100ae50d | 380 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
381 | |
382 | static void | |
9de87eea | 383 | increase_block (void *data) |
e292f7aa | 384 | { |
9de87eea | 385 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
386 | } |
387 | ||
388 | static void | |
9de87eea | 389 | decrease_block (void *data) |
e292f7aa | 390 | { |
9de87eea | 391 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 392 | scm_async_click (); |
e292f7aa MV |
393 | } |
394 | ||
395 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
396 | (SCM proc), | |
397 | "Call @var{proc} with no arguments and block the execution\n" | |
398 | "of system asyncs by one level for the current thread while\n" | |
399 | "it is running. Return the value returned by @var{proc}.\n") | |
400 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
401 | { | |
402 | return scm_internal_dynamic_wind (increase_block, | |
403 | (scm_t_inner) scm_call_0, | |
404 | decrease_block, | |
9de87eea MV |
405 | (void *)proc, |
406 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
407 | } |
408 | #undef FUNC_NAME | |
409 | ||
410 | void * | |
411 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
412 | { | |
402858a4 MV |
413 | return (void *)scm_internal_dynamic_wind (increase_block, |
414 | (scm_t_inner) proc, | |
415 | decrease_block, | |
9de87eea MV |
416 | data, |
417 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
418 | } |
419 | ||
420 | ||
421 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
422 | (SCM proc), | |
423 | "Call @var{proc} with no arguments and unblock the execution\n" | |
424 | "of system asyncs by one level for the current thread while\n" | |
425 | "it is running. Return the value returned by @var{proc}.\n") | |
426 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
427 | { | |
9de87eea | 428 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
429 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
430 | return scm_internal_dynamic_wind (decrease_block, | |
431 | (scm_t_inner) scm_call_0, | |
432 | increase_block, | |
9de87eea MV |
433 | (void *)proc, |
434 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
435 | } |
436 | #undef FUNC_NAME | |
437 | ||
438 | void * | |
439 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
440 | { | |
9de87eea | 441 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
442 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
443 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
444 | return (void *)scm_internal_dynamic_wind (decrease_block, |
445 | (scm_t_inner) proc, | |
446 | increase_block, | |
9de87eea MV |
447 | data, |
448 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
449 | } |
450 | ||
b57a0953 | 451 | void |
661ae7ab | 452 | scm_dynwind_block_asyncs () |
b57a0953 | 453 | { |
9de87eea | 454 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
661ae7ab MV |
455 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); |
456 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
457 | } |
458 | ||
459 | void | |
661ae7ab | 460 | scm_dynwind_unblock_asyncs () |
b57a0953 | 461 | { |
9de87eea MV |
462 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
463 | if (t->block_asyncs == 0) | |
b57a0953 MV |
464 | scm_misc_error ("scm_with_unblocked_asyncs", |
465 | "asyncs already unblocked", SCM_EOL); | |
661ae7ab MV |
466 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
467 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
468 | } |
469 | ||
470 | ||
0f2d19dd JB |
471 | \f |
472 | ||
0f2d19dd JB |
473 | void |
474 | scm_init_async () | |
0f2d19dd | 475 | { |
939794ce | 476 | scm_asyncs = SCM_EOL; |
73ea78af | 477 | tc16_async = scm_make_smob_type ("async", 0); |
73ea78af | 478 | |
a0599745 | 479 | #include "libguile/async.x" |
0f2d19dd | 480 | } |
89e00824 ML |
481 | |
482 | /* | |
483 | Local Variables: | |
484 | c-file-style: "gnu" | |
485 | End: | |
486 | */ |