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b57a0953 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2004 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 | static SCM |
2d3179db | 90 | async_gc_mark (SCM obj) |
0f2d19dd | 91 | { |
e94e3f21 | 92 | return ASYNC_THUNK (obj); |
0f2d19dd JB |
93 | } |
94 | ||
843e4e9d | 95 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
96 | (SCM thunk), |
97 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 98 | #define FUNC_NAME s_scm_async |
0f2d19dd | 99 | { |
e94e3f21 | 100 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 101 | } |
1bbd0b84 | 102 | #undef FUNC_NAME |
0f2d19dd | 103 | |
843e4e9d | 104 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 105 | (SCM a), |
811cf846 | 106 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 107 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 108 | { |
e94e3f21 | 109 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 110 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
111 | return SCM_UNSPECIFIED; |
112 | } | |
1bbd0b84 | 113 | #undef FUNC_NAME |
0f2d19dd | 114 | |
843e4e9d | 115 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
116 | (SCM list_of_a), |
117 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 118 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 119 | { |
c96d76b8 | 120 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
121 | { |
122 | SCM a; | |
9f0e55a6 | 123 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 124 | a = SCM_CAR (list_of_a); |
e94e3f21 | 125 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 126 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 127 | { |
e94e3f21 | 128 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 129 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 130 | } |
1bbd0b84 | 131 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
132 | } |
133 | return SCM_BOOL_T; | |
134 | } | |
1bbd0b84 | 135 | #undef FUNC_NAME |
0f2d19dd JB |
136 | |
137 | \f | |
138 | ||
9de87eea MV |
139 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
140 | ||
2d3179db | 141 | /* System asyncs. */ |
0f2d19dd | 142 | |
2d3179db MV |
143 | void |
144 | scm_async_click () | |
0f2d19dd | 145 | { |
9de87eea MV |
146 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
147 | SCM asyncs; | |
148 | ||
402858a4 | 149 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
150 | executed since this will avoid future futile calls to this |
151 | function. When asyncs are unblocked again, this function is | |
152 | invoked even when pending_asyncs is zero. | |
402858a4 | 153 | */ |
2d3179db | 154 | |
9de87eea MV |
155 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
156 | t->pending_asyncs = 0; | |
157 | if (t->block_asyncs == 0) | |
2d3179db | 158 | { |
9de87eea MV |
159 | asyncs = t->active_asyncs; |
160 | t->active_asyncs = SCM_EOL; | |
161 | } | |
162 | else | |
163 | asyncs = SCM_EOL; | |
164 | scm_i_pthread_mutex_unlock (&async_mutex); | |
165 | ||
166 | while (scm_is_pair (asyncs)) | |
167 | { | |
168 | SCM next = SCM_CDR (asyncs); | |
169 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
170 | scm_call_0 (SCM_CAR (asyncs)); | |
171 | asyncs = next; | |
2d3179db | 172 | } |
0f2d19dd JB |
173 | } |
174 | ||
100ae50d DH |
175 | #if (SCM_ENABLE_DEPRECATED == 1) |
176 | ||
2d3179db MV |
177 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
178 | (SCM thunk), | |
179 | "This function is deprecated. You can use @var{thunk} directly\n" | |
100ae50d | 180 | "instead of explicitely creating an async object.\n") |
2d3179db MV |
181 | #define FUNC_NAME s_scm_system_async |
182 | { | |
183 | scm_c_issue_deprecation_warning | |
184 | ("'system-async' is deprecated. " | |
185 | "Use the procedure directly with 'system-async-mark'."); | |
186 | return thunk; | |
187 | } | |
188 | #undef FUNC_NAME | |
0f2d19dd | 189 | |
100ae50d DH |
190 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
191 | ||
2d3179db | 192 | void |
9de87eea | 193 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 194 | { |
9de87eea MV |
195 | SCM sleep_object; |
196 | scm_i_pthread_mutex_t *sleep_mutex; | |
197 | int sleep_fd; | |
198 | SCM p; | |
199 | ||
200 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
201 | p = t->active_asyncs; | |
402858a4 | 202 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
203 | if (!scm_is_pair (p)) |
204 | t->active_asyncs = c; | |
402858a4 | 205 | else |
2d3179db | 206 | { |
402858a4 | 207 | SCM pp; |
9de87eea | 208 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 209 | { |
9de87eea MV |
210 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
211 | { | |
212 | scm_i_pthread_mutex_unlock (&async_mutex); | |
213 | return; | |
214 | } | |
402858a4 | 215 | p = pp; |
f6b44bd9 | 216 | } |
402858a4 | 217 | SCM_SETCDR (p, c); |
2d3179db | 218 | } |
9de87eea MV |
219 | t->pending_asyncs = 1; |
220 | sleep_object = t->sleep_object; | |
221 | sleep_mutex = t->sleep_mutex; | |
222 | sleep_fd = t->sleep_fd; | |
223 | scm_i_pthread_mutex_unlock (&async_mutex); | |
224 | ||
225 | if (sleep_mutex) | |
226 | { | |
227 | /* By now, the thread T might be out of its sleep already, or | |
228 | might even be in the next, unrelated sleep. Interrupting it | |
229 | anyway does no harm, however. | |
230 | ||
231 | The important thing to prevent here is to signal sleep_cond | |
232 | before T waits on it. This can not happen since T has | |
233 | sleep_mutex locked while setting t->sleep_mutex and will only | |
234 | unlock it again while waiting on sleep_cond. | |
235 | */ | |
236 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
237 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
238 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
239 | } | |
240 | ||
241 | if (sleep_fd >= 0) | |
242 | { | |
243 | char dummy = 0; | |
244 | /* Likewise, T might already been done with sleeping here, but | |
245 | interrupting it once too often does no harm. T might also | |
246 | not yet have started sleeping, but this is no problem either | |
247 | since the data written to a pipe will not be lost, unlike a | |
248 | condition variable signal. | |
249 | */ | |
250 | write (sleep_fd, &dummy, 1); | |
251 | } | |
252 | ||
253 | /* This is needed to protect sleep_mutex. | |
254 | */ | |
255 | scm_remember_upto_here_1 (sleep_object); | |
256 | } | |
257 | ||
258 | int | |
259 | scm_i_setup_sleep (scm_i_thread *t, | |
260 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
261 | int sleep_fd) | |
262 | { | |
263 | int pending; | |
264 | ||
265 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
266 | pending = t->pending_asyncs; | |
267 | if (!pending) | |
268 | { | |
269 | t->sleep_object = sleep_object; | |
270 | t->sleep_mutex = sleep_mutex; | |
271 | t->sleep_fd = sleep_fd; | |
272 | } | |
273 | scm_i_pthread_mutex_unlock (&async_mutex); | |
274 | return pending; | |
275 | } | |
276 | ||
277 | void | |
278 | scm_i_reset_sleep (scm_i_thread *t) | |
279 | { | |
280 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
281 | t->sleep_object = SCM_BOOL_F; | |
282 | t->sleep_mutex = NULL; | |
283 | t->sleep_fd = -1; | |
284 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 285 | } |
0f2d19dd | 286 | |
2d3179db MV |
287 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
288 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
289 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
290 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
291 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
292 | "If @var{thread} is omitted, the thread that called\n" | |
293 | "@code{system-async-mark} is used.\n\n" | |
294 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
295 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
296 | "signal handlers.") | |
2d3179db MV |
297 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
298 | { | |
9de87eea MV |
299 | /* The current thread might not have a handle yet. This can happen |
300 | when the GC runs immediately before allocating the handle. At | |
301 | the end of that GC, a system async might be marked. Thus, we can | |
302 | not use scm_current_thread here. | |
303 | */ | |
304 | ||
305 | scm_i_thread *t; | |
306 | ||
028e573c | 307 | if (SCM_UNBNDP (thread)) |
9de87eea | 308 | t = SCM_I_CURRENT_THREAD; |
028e573c | 309 | else |
402858a4 MV |
310 | { |
311 | SCM_VALIDATE_THREAD (2, thread); | |
312 | if (scm_c_thread_exited_p (thread)) | |
313 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 314 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 315 | } |
9de87eea | 316 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
317 | return SCM_UNSPECIFIED; |
318 | } | |
319 | #undef FUNC_NAME | |
9f0e55a6 | 320 | |
2d3179db MV |
321 | SCM |
322 | scm_system_async_mark (SCM proc) | |
323 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 324 | { |
2d3179db | 325 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 326 | } |
1bbd0b84 | 327 | #undef FUNC_NAME |
0f2d19dd JB |
328 | |
329 | \f | |
330 | ||
331 | ||
2d3179db MV |
332 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
333 | (SCM args), | |
334 | "Do nothing. When called without arguments, return @code{#f},\n" | |
335 | "otherwise return the first argument.") | |
336 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 337 | { |
2d3179db MV |
338 | SCM_VALIDATE_REST_ARGUMENT (args); |
339 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 340 | } |
1bbd0b84 | 341 | #undef FUNC_NAME |
0f2d19dd | 342 | |
0f2d19dd | 343 | |
0f2d19dd JB |
344 | \f |
345 | ||
100ae50d | 346 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 347 | |
843e4e9d | 348 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
349 | (), |
350 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 351 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 352 | { |
9de87eea MV |
353 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
354 | ||
e292f7aa MV |
355 | scm_c_issue_deprecation_warning |
356 | ("'unmask-signals' is deprecated. " | |
357 | "Use 'call-with-blocked-asyncs' instead."); | |
358 | ||
9de87eea | 359 | if (t->block_asyncs == 0) |
e292f7aa | 360 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 361 | t->block_asyncs = 0; |
402858a4 | 362 | scm_async_click (); |
0f2d19dd JB |
363 | return SCM_UNSPECIFIED; |
364 | } | |
1bbd0b84 | 365 | #undef FUNC_NAME |
0f2d19dd JB |
366 | |
367 | ||
843e4e9d | 368 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
369 | (), |
370 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 371 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 372 | { |
9de87eea MV |
373 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
374 | ||
e292f7aa MV |
375 | scm_c_issue_deprecation_warning |
376 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
377 | ||
9de87eea | 378 | if (t->block_asyncs > 0) |
e292f7aa | 379 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 380 | t->block_asyncs = 1; |
0f2d19dd JB |
381 | return SCM_UNSPECIFIED; |
382 | } | |
1bbd0b84 | 383 | #undef FUNC_NAME |
0f2d19dd | 384 | |
100ae50d | 385 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
386 | |
387 | static void | |
9de87eea | 388 | increase_block (void *data) |
e292f7aa | 389 | { |
9de87eea | 390 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
391 | } |
392 | ||
393 | static void | |
9de87eea | 394 | decrease_block (void *data) |
e292f7aa | 395 | { |
9de87eea | 396 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 397 | scm_async_click (); |
e292f7aa MV |
398 | } |
399 | ||
400 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
401 | (SCM proc), | |
402 | "Call @var{proc} with no arguments and block the execution\n" | |
403 | "of system asyncs by one level for the current thread while\n" | |
404 | "it is running. Return the value returned by @var{proc}.\n") | |
405 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
406 | { | |
407 | return scm_internal_dynamic_wind (increase_block, | |
408 | (scm_t_inner) scm_call_0, | |
409 | decrease_block, | |
9de87eea MV |
410 | (void *)proc, |
411 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
412 | } |
413 | #undef FUNC_NAME | |
414 | ||
415 | void * | |
416 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
417 | { | |
402858a4 MV |
418 | return (void *)scm_internal_dynamic_wind (increase_block, |
419 | (scm_t_inner) proc, | |
420 | decrease_block, | |
9de87eea MV |
421 | data, |
422 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
423 | } |
424 | ||
425 | ||
426 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
427 | (SCM proc), | |
428 | "Call @var{proc} with no arguments and unblock the execution\n" | |
429 | "of system asyncs by one level for the current thread while\n" | |
430 | "it is running. Return the value returned by @var{proc}.\n") | |
431 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
432 | { | |
9de87eea | 433 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
434 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
435 | return scm_internal_dynamic_wind (decrease_block, | |
436 | (scm_t_inner) scm_call_0, | |
437 | increase_block, | |
9de87eea MV |
438 | (void *)proc, |
439 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
440 | } |
441 | #undef FUNC_NAME | |
442 | ||
443 | void * | |
444 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
445 | { | |
9de87eea | 446 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
447 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
448 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
449 | return (void *)scm_internal_dynamic_wind (decrease_block, |
450 | (scm_t_inner) proc, | |
451 | increase_block, | |
9de87eea MV |
452 | data, |
453 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
454 | } |
455 | ||
b57a0953 | 456 | void |
dfe610a0 | 457 | scm_frame_block_asyncs () |
b57a0953 | 458 | { |
9de87eea MV |
459 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
460 | scm_frame_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
461 | scm_frame_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
462 | } |
463 | ||
464 | void | |
dfe610a0 | 465 | scm_frame_unblock_asyncs () |
b57a0953 | 466 | { |
9de87eea MV |
467 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
468 | if (t->block_asyncs == 0) | |
b57a0953 MV |
469 | scm_misc_error ("scm_with_unblocked_asyncs", |
470 | "asyncs already unblocked", SCM_EOL); | |
9de87eea MV |
471 | scm_frame_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
472 | scm_frame_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
473 | } |
474 | ||
475 | ||
0f2d19dd JB |
476 | \f |
477 | ||
0f2d19dd JB |
478 | void |
479 | scm_init_async () | |
0f2d19dd | 480 | { |
939794ce | 481 | scm_asyncs = SCM_EOL; |
73ea78af | 482 | tc16_async = scm_make_smob_type ("async", 0); |
2d3179db | 483 | scm_set_smob_mark (tc16_async, async_gc_mark); |
73ea78af | 484 | |
a0599745 | 485 | #include "libguile/async.x" |
0f2d19dd | 486 | } |
89e00824 ML |
487 | |
488 | /* | |
489 | Local Variables: | |
490 | c-file-style: "gnu" | |
491 | End: | |
492 | */ |