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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 | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
843e4e9d | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * 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 | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd | 20 | \f |
dbb605f5 | 21 | #ifdef HAVE_CONFIG_H |
ef92a2a2 RB |
22 | # include <config.h> |
23 | #endif | |
0f2d19dd | 24 | |
0f2d19dd | 25 | #include <signal.h> |
a0599745 MD |
26 | #include "libguile/_scm.h" |
27 | #include "libguile/eval.h" | |
28 | #include "libguile/throw.h" | |
29 | #include "libguile/root.h" | |
30 | #include "libguile/smob.h" | |
c96d76b8 | 31 | #include "libguile/lang.h" |
e292f7aa | 32 | #include "libguile/dynwind.h" |
2d3179db | 33 | #include "libguile/deprecation.h" |
20e6290e | 34 | |
a0599745 MD |
35 | #include "libguile/validate.h" |
36 | #include "libguile/async.h" | |
0f2d19dd | 37 | |
95b88819 GH |
38 | #ifdef HAVE_STRING_H |
39 | #include <string.h> | |
40 | #endif | |
0f2d19dd JB |
41 | #ifdef HAVE_UNISTD_H |
42 | #include <unistd.h> | |
43 | #endif | |
44 | ||
634aa8de LC |
45 | #include <full-write.h> |
46 | ||
0f2d19dd JB |
47 | \f |
48 | /* {Asynchronous Events} | |
49 | * | |
2d3179db MV |
50 | * There are two kinds of asyncs: system asyncs and user asyncs. The |
51 | * two kinds have some concepts in commen but work slightly | |
52 | * differently and are not interchangeable. | |
0f2d19dd | 53 | * |
2d3179db MV |
54 | * System asyncs are used to run arbitrary code at the next safe point |
55 | * in a specified thread. You can use them to trigger execution of | |
56 | * Scheme code from signal handlers or to interrupt a thread, for | |
57 | * example. | |
0f2d19dd | 58 | * |
2d3179db MV |
59 | * Each thread has a list of 'activated asyncs', which is a normal |
60 | * Scheme list of procedures with zero arguments. When a thread | |
61 | * executes a SCM_ASYNC_TICK statement (which is included in | |
62 | * SCM_TICK), it will call all procedures on this list. | |
843e4e9d | 63 | * |
2d3179db MV |
64 | * Also, a thread will wake up when a procedure is added to its list |
65 | * of active asyncs and call them. After that, it will go to sleep | |
66 | * again. (Not implemented yet.) | |
0f2d19dd | 67 | * |
0f2d19dd | 68 | * |
2d3179db MV |
69 | * User asyncs are a little data structure that consists of a |
70 | * procedure of zero arguments and a mark. There are functions for | |
71 | * setting the mark of a user async and for calling all procedures of | |
72 | * marked asyncs in a given list. Nothing you couldn't quickly | |
73 | * implement yourself. | |
0f2d19dd JB |
74 | */ |
75 | ||
0f2d19dd | 76 | |
2d3179db | 77 | \f |
0f2d19dd | 78 | |
2d3179db | 79 | /* User asyncs. */ |
e94e3f21 | 80 | |
2d3179db | 81 | static scm_t_bits tc16_async; |
e94e3f21 ML |
82 | |
83 | /* cmm: this has SCM_ prefix because SCM_MAKE_VALIDATE expects it. | |
84 | this is ugly. */ | |
e841c3e0 | 85 | #define SCM_ASYNCP(X) SCM_TYP16_PREDICATE (tc16_async, X) |
6182ceac | 86 | #define VALIDATE_ASYNC(pos, a) SCM_MAKE_VALIDATE_MSG(pos, a, ASYNCP, "user async") |
e94e3f21 ML |
87 | |
88 | #define ASYNC_GOT_IT(X) (SCM_CELL_WORD_0 (X) >> 16) | |
d1ca2c64 | 89 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_CELL_WORD_0 ((X), SCM_TYP16 (X) | ((V) << 16))) |
e94e3f21 | 90 | #define ASYNC_THUNK(X) SCM_CELL_OBJECT_1 (X) |
0f2d19dd | 91 | |
0f2d19dd | 92 | static SCM |
2d3179db | 93 | async_gc_mark (SCM obj) |
0f2d19dd | 94 | { |
e94e3f21 | 95 | return ASYNC_THUNK (obj); |
0f2d19dd JB |
96 | } |
97 | ||
843e4e9d | 98 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
99 | (SCM thunk), |
100 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 101 | #define FUNC_NAME s_scm_async |
0f2d19dd | 102 | { |
e94e3f21 | 103 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 104 | } |
1bbd0b84 | 105 | #undef FUNC_NAME |
0f2d19dd | 106 | |
843e4e9d | 107 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 108 | (SCM a), |
811cf846 | 109 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 110 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 111 | { |
e94e3f21 | 112 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 113 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
114 | return SCM_UNSPECIFIED; |
115 | } | |
1bbd0b84 | 116 | #undef FUNC_NAME |
0f2d19dd | 117 | |
843e4e9d | 118 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
119 | (SCM list_of_a), |
120 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 121 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 122 | { |
c96d76b8 | 123 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
124 | { |
125 | SCM a; | |
9f0e55a6 | 126 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 127 | a = SCM_CAR (list_of_a); |
e94e3f21 | 128 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 129 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 130 | { |
e94e3f21 | 131 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 132 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 133 | } |
1bbd0b84 | 134 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
135 | } |
136 | return SCM_BOOL_T; | |
137 | } | |
1bbd0b84 | 138 | #undef FUNC_NAME |
0f2d19dd JB |
139 | |
140 | \f | |
141 | ||
9de87eea MV |
142 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
143 | ||
2d3179db | 144 | /* System asyncs. */ |
0f2d19dd | 145 | |
2d3179db MV |
146 | void |
147 | scm_async_click () | |
0f2d19dd | 148 | { |
9de87eea MV |
149 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
150 | SCM asyncs; | |
151 | ||
402858a4 | 152 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
153 | executed since this will avoid future futile calls to this |
154 | function. When asyncs are unblocked again, this function is | |
155 | invoked even when pending_asyncs is zero. | |
402858a4 | 156 | */ |
2d3179db | 157 | |
9de87eea MV |
158 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
159 | t->pending_asyncs = 0; | |
160 | if (t->block_asyncs == 0) | |
2d3179db | 161 | { |
9de87eea MV |
162 | asyncs = t->active_asyncs; |
163 | t->active_asyncs = SCM_EOL; | |
164 | } | |
165 | else | |
166 | asyncs = SCM_EOL; | |
167 | scm_i_pthread_mutex_unlock (&async_mutex); | |
168 | ||
169 | while (scm_is_pair (asyncs)) | |
170 | { | |
171 | SCM next = SCM_CDR (asyncs); | |
172 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
173 | scm_call_0 (SCM_CAR (asyncs)); | |
174 | asyncs = next; | |
2d3179db | 175 | } |
0f2d19dd JB |
176 | } |
177 | ||
100ae50d DH |
178 | #if (SCM_ENABLE_DEPRECATED == 1) |
179 | ||
2d3179db MV |
180 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
181 | (SCM thunk), | |
182 | "This function is deprecated. You can use @var{thunk} directly\n" | |
877f06c3 | 183 | "instead of explicitly creating an async object.\n") |
2d3179db MV |
184 | #define FUNC_NAME s_scm_system_async |
185 | { | |
186 | scm_c_issue_deprecation_warning | |
187 | ("'system-async' is deprecated. " | |
188 | "Use the procedure directly with 'system-async-mark'."); | |
189 | return thunk; | |
190 | } | |
191 | #undef FUNC_NAME | |
0f2d19dd | 192 | |
100ae50d DH |
193 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
194 | ||
2d3179db | 195 | void |
9de87eea | 196 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 197 | { |
9de87eea MV |
198 | SCM sleep_object; |
199 | scm_i_pthread_mutex_t *sleep_mutex; | |
200 | int sleep_fd; | |
201 | SCM p; | |
202 | ||
203 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
204 | p = t->active_asyncs; | |
402858a4 | 205 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
206 | if (!scm_is_pair (p)) |
207 | t->active_asyncs = c; | |
402858a4 | 208 | else |
2d3179db | 209 | { |
402858a4 | 210 | SCM pp; |
9de87eea | 211 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 212 | { |
9de87eea MV |
213 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
214 | { | |
215 | scm_i_pthread_mutex_unlock (&async_mutex); | |
216 | return; | |
217 | } | |
402858a4 | 218 | p = pp; |
f6b44bd9 | 219 | } |
402858a4 | 220 | SCM_SETCDR (p, c); |
2d3179db | 221 | } |
9de87eea MV |
222 | t->pending_asyncs = 1; |
223 | sleep_object = t->sleep_object; | |
224 | sleep_mutex = t->sleep_mutex; | |
225 | sleep_fd = t->sleep_fd; | |
226 | scm_i_pthread_mutex_unlock (&async_mutex); | |
227 | ||
228 | if (sleep_mutex) | |
229 | { | |
230 | /* By now, the thread T might be out of its sleep already, or | |
231 | might even be in the next, unrelated sleep. Interrupting it | |
232 | anyway does no harm, however. | |
233 | ||
234 | The important thing to prevent here is to signal sleep_cond | |
235 | before T waits on it. This can not happen since T has | |
236 | sleep_mutex locked while setting t->sleep_mutex and will only | |
237 | unlock it again while waiting on sleep_cond. | |
238 | */ | |
239 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
240 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
241 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
242 | } | |
243 | ||
244 | if (sleep_fd >= 0) | |
245 | { | |
246 | char dummy = 0; | |
634aa8de | 247 | |
9de87eea MV |
248 | /* Likewise, T might already been done with sleeping here, but |
249 | interrupting it once too often does no harm. T might also | |
250 | not yet have started sleeping, but this is no problem either | |
251 | since the data written to a pipe will not be lost, unlike a | |
634aa8de LC |
252 | condition variable signal. */ |
253 | full_write (sleep_fd, &dummy, 1); | |
9de87eea MV |
254 | } |
255 | ||
256 | /* This is needed to protect sleep_mutex. | |
257 | */ | |
258 | scm_remember_upto_here_1 (sleep_object); | |
259 | } | |
260 | ||
261 | int | |
262 | scm_i_setup_sleep (scm_i_thread *t, | |
263 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
264 | int sleep_fd) | |
265 | { | |
266 | int pending; | |
267 | ||
268 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
269 | pending = t->pending_asyncs; | |
270 | if (!pending) | |
271 | { | |
272 | t->sleep_object = sleep_object; | |
273 | t->sleep_mutex = sleep_mutex; | |
274 | t->sleep_fd = sleep_fd; | |
275 | } | |
276 | scm_i_pthread_mutex_unlock (&async_mutex); | |
277 | return pending; | |
278 | } | |
279 | ||
280 | void | |
281 | scm_i_reset_sleep (scm_i_thread *t) | |
282 | { | |
283 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
284 | t->sleep_object = SCM_BOOL_F; | |
285 | t->sleep_mutex = NULL; | |
286 | t->sleep_fd = -1; | |
287 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 288 | } |
0f2d19dd | 289 | |
2d3179db MV |
290 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
291 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
292 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
293 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
294 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
295 | "If @var{thread} is omitted, the thread that called\n" | |
296 | "@code{system-async-mark} is used.\n\n" | |
297 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
298 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
299 | "signal handlers.") | |
2d3179db MV |
300 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
301 | { | |
9de87eea MV |
302 | /* The current thread might not have a handle yet. This can happen |
303 | when the GC runs immediately before allocating the handle. At | |
304 | the end of that GC, a system async might be marked. Thus, we can | |
305 | not use scm_current_thread here. | |
306 | */ | |
307 | ||
308 | scm_i_thread *t; | |
309 | ||
028e573c | 310 | if (SCM_UNBNDP (thread)) |
9de87eea | 311 | t = SCM_I_CURRENT_THREAD; |
028e573c | 312 | else |
402858a4 MV |
313 | { |
314 | SCM_VALIDATE_THREAD (2, thread); | |
315 | if (scm_c_thread_exited_p (thread)) | |
316 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 317 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 318 | } |
9de87eea | 319 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
320 | return SCM_UNSPECIFIED; |
321 | } | |
322 | #undef FUNC_NAME | |
9f0e55a6 | 323 | |
2d3179db MV |
324 | SCM |
325 | scm_system_async_mark (SCM proc) | |
326 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 327 | { |
2d3179db | 328 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 329 | } |
1bbd0b84 | 330 | #undef FUNC_NAME |
0f2d19dd JB |
331 | |
332 | \f | |
333 | ||
334 | ||
2d3179db MV |
335 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
336 | (SCM args), | |
337 | "Do nothing. When called without arguments, return @code{#f},\n" | |
338 | "otherwise return the first argument.") | |
339 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 340 | { |
2d3179db MV |
341 | SCM_VALIDATE_REST_ARGUMENT (args); |
342 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 343 | } |
1bbd0b84 | 344 | #undef FUNC_NAME |
0f2d19dd | 345 | |
0f2d19dd | 346 | |
0f2d19dd JB |
347 | \f |
348 | ||
100ae50d | 349 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 350 | |
843e4e9d | 351 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
352 | (), |
353 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 354 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 355 | { |
9de87eea MV |
356 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
357 | ||
e292f7aa MV |
358 | scm_c_issue_deprecation_warning |
359 | ("'unmask-signals' is deprecated. " | |
360 | "Use 'call-with-blocked-asyncs' instead."); | |
361 | ||
9de87eea | 362 | if (t->block_asyncs == 0) |
e292f7aa | 363 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 364 | t->block_asyncs = 0; |
402858a4 | 365 | scm_async_click (); |
0f2d19dd JB |
366 | return SCM_UNSPECIFIED; |
367 | } | |
1bbd0b84 | 368 | #undef FUNC_NAME |
0f2d19dd JB |
369 | |
370 | ||
843e4e9d | 371 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
372 | (), |
373 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 374 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 375 | { |
9de87eea MV |
376 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
377 | ||
e292f7aa MV |
378 | scm_c_issue_deprecation_warning |
379 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
380 | ||
9de87eea | 381 | if (t->block_asyncs > 0) |
e292f7aa | 382 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 383 | t->block_asyncs = 1; |
0f2d19dd JB |
384 | return SCM_UNSPECIFIED; |
385 | } | |
1bbd0b84 | 386 | #undef FUNC_NAME |
0f2d19dd | 387 | |
100ae50d | 388 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
389 | |
390 | static void | |
9de87eea | 391 | increase_block (void *data) |
e292f7aa | 392 | { |
9de87eea | 393 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
394 | } |
395 | ||
396 | static void | |
9de87eea | 397 | decrease_block (void *data) |
e292f7aa | 398 | { |
9de87eea | 399 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 400 | scm_async_click (); |
e292f7aa MV |
401 | } |
402 | ||
403 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
404 | (SCM proc), | |
405 | "Call @var{proc} with no arguments and block the execution\n" | |
406 | "of system asyncs by one level for the current thread while\n" | |
407 | "it is running. Return the value returned by @var{proc}.\n") | |
408 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
409 | { | |
410 | return scm_internal_dynamic_wind (increase_block, | |
411 | (scm_t_inner) scm_call_0, | |
412 | decrease_block, | |
9de87eea MV |
413 | (void *)proc, |
414 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
415 | } |
416 | #undef FUNC_NAME | |
417 | ||
418 | void * | |
419 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
420 | { | |
402858a4 MV |
421 | return (void *)scm_internal_dynamic_wind (increase_block, |
422 | (scm_t_inner) proc, | |
423 | decrease_block, | |
9de87eea MV |
424 | data, |
425 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
426 | } |
427 | ||
428 | ||
429 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
430 | (SCM proc), | |
431 | "Call @var{proc} with no arguments and unblock the execution\n" | |
432 | "of system asyncs by one level for the current thread while\n" | |
433 | "it is running. Return the value returned by @var{proc}.\n") | |
434 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
435 | { | |
9de87eea | 436 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
437 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
438 | return scm_internal_dynamic_wind (decrease_block, | |
439 | (scm_t_inner) scm_call_0, | |
440 | increase_block, | |
9de87eea MV |
441 | (void *)proc, |
442 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
443 | } |
444 | #undef FUNC_NAME | |
445 | ||
446 | void * | |
447 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
448 | { | |
9de87eea | 449 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
450 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
451 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
452 | return (void *)scm_internal_dynamic_wind (decrease_block, |
453 | (scm_t_inner) proc, | |
454 | increase_block, | |
9de87eea MV |
455 | data, |
456 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
457 | } |
458 | ||
b57a0953 | 459 | void |
661ae7ab | 460 | scm_dynwind_block_asyncs () |
b57a0953 | 461 | { |
9de87eea | 462 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
661ae7ab MV |
463 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); |
464 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
465 | } |
466 | ||
467 | void | |
661ae7ab | 468 | scm_dynwind_unblock_asyncs () |
b57a0953 | 469 | { |
9de87eea MV |
470 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
471 | if (t->block_asyncs == 0) | |
b57a0953 MV |
472 | scm_misc_error ("scm_with_unblocked_asyncs", |
473 | "asyncs already unblocked", SCM_EOL); | |
661ae7ab MV |
474 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
475 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
476 | } |
477 | ||
478 | ||
0f2d19dd JB |
479 | \f |
480 | ||
0f2d19dd JB |
481 | void |
482 | scm_init_async () | |
0f2d19dd | 483 | { |
939794ce | 484 | scm_asyncs = SCM_EOL; |
73ea78af | 485 | tc16_async = scm_make_smob_type ("async", 0); |
2d3179db | 486 | scm_set_smob_mark (tc16_async, async_gc_mark); |
73ea78af | 487 | |
a0599745 | 488 | #include "libguile/async.x" |
0f2d19dd | 489 | } |
89e00824 ML |
490 | |
491 | /* | |
492 | Local Variables: | |
493 | c-file-style: "gnu" | |
494 | End: | |
495 | */ |