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cd038da5 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2004, 2006, 2008, 2009, 2010 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 | |
0eb934f1 LC |
25 | #define SCM_BUILDING_DEPRECATED_CODE |
26 | ||
0f2d19dd | 27 | #include <signal.h> |
a0599745 MD |
28 | #include "libguile/_scm.h" |
29 | #include "libguile/eval.h" | |
30 | #include "libguile/throw.h" | |
31 | #include "libguile/root.h" | |
32 | #include "libguile/smob.h" | |
e292f7aa | 33 | #include "libguile/dynwind.h" |
2d3179db | 34 | #include "libguile/deprecation.h" |
20e6290e | 35 | |
a0599745 MD |
36 | #include "libguile/validate.h" |
37 | #include "libguile/async.h" | |
0f2d19dd | 38 | |
95b88819 GH |
39 | #ifdef HAVE_STRING_H |
40 | #include <string.h> | |
41 | #endif | |
0f2d19dd JB |
42 | #ifdef HAVE_UNISTD_H |
43 | #include <unistd.h> | |
44 | #endif | |
45 | ||
634aa8de LC |
46 | #include <full-write.h> |
47 | ||
0f2d19dd JB |
48 | \f |
49 | /* {Asynchronous Events} | |
50 | * | |
2d3179db MV |
51 | * There are two kinds of asyncs: system asyncs and user asyncs. The |
52 | * two kinds have some concepts in commen but work slightly | |
53 | * differently and are not interchangeable. | |
0f2d19dd | 54 | * |
2d3179db MV |
55 | * System asyncs are used to run arbitrary code at the next safe point |
56 | * in a specified thread. You can use them to trigger execution of | |
57 | * Scheme code from signal handlers or to interrupt a thread, for | |
58 | * example. | |
0f2d19dd | 59 | * |
2d3179db MV |
60 | * Each thread has a list of 'activated asyncs', which is a normal |
61 | * Scheme list of procedures with zero arguments. When a thread | |
62 | * executes a SCM_ASYNC_TICK statement (which is included in | |
63 | * SCM_TICK), it will call all procedures on this list. | |
843e4e9d | 64 | * |
2d3179db MV |
65 | * Also, a thread will wake up when a procedure is added to its list |
66 | * of active asyncs and call them. After that, it will go to sleep | |
67 | * again. (Not implemented yet.) | |
0f2d19dd | 68 | * |
0f2d19dd | 69 | * |
2d3179db MV |
70 | * User asyncs are a little data structure that consists of a |
71 | * procedure of zero arguments and a mark. There are functions for | |
72 | * setting the mark of a user async and for calling all procedures of | |
73 | * marked asyncs in a given list. Nothing you couldn't quickly | |
74 | * implement yourself. | |
0f2d19dd JB |
75 | */ |
76 | ||
0f2d19dd | 77 | |
2d3179db | 78 | \f |
0f2d19dd | 79 | |
2d3179db | 80 | /* User asyncs. */ |
e94e3f21 | 81 | |
2d3179db | 82 | static scm_t_bits tc16_async; |
e94e3f21 ML |
83 | |
84 | /* cmm: this has SCM_ prefix because SCM_MAKE_VALIDATE expects it. | |
85 | this is ugly. */ | |
e841c3e0 | 86 | #define SCM_ASYNCP(X) SCM_TYP16_PREDICATE (tc16_async, X) |
6182ceac | 87 | #define VALIDATE_ASYNC(pos, a) SCM_MAKE_VALIDATE_MSG(pos, a, ASYNCP, "user async") |
e94e3f21 | 88 | |
e779fef7 AW |
89 | #define ASYNC_GOT_IT(X) (SCM_SMOB_FLAGS (X)) |
90 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_SMOB_FLAGS ((X), ((V)))) | |
91 | #define ASYNC_THUNK(X) SCM_SMOB_OBJECT_1 (X) | |
0f2d19dd | 92 | |
0f2d19dd | 93 | |
843e4e9d | 94 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
95 | (SCM thunk), |
96 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 97 | #define FUNC_NAME s_scm_async |
0f2d19dd | 98 | { |
e94e3f21 | 99 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 100 | } |
1bbd0b84 | 101 | #undef FUNC_NAME |
0f2d19dd | 102 | |
843e4e9d | 103 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 104 | (SCM a), |
811cf846 | 105 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 106 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 107 | { |
e94e3f21 | 108 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 109 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
110 | return SCM_UNSPECIFIED; |
111 | } | |
1bbd0b84 | 112 | #undef FUNC_NAME |
0f2d19dd | 113 | |
843e4e9d | 114 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
115 | (SCM list_of_a), |
116 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 117 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 118 | { |
c96d76b8 | 119 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
120 | { |
121 | SCM a; | |
9f0e55a6 | 122 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 123 | a = SCM_CAR (list_of_a); |
e94e3f21 | 124 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 125 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 126 | { |
e94e3f21 | 127 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 128 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 129 | } |
1bbd0b84 | 130 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
131 | } |
132 | return SCM_BOOL_T; | |
133 | } | |
1bbd0b84 | 134 | #undef FUNC_NAME |
0f2d19dd JB |
135 | |
136 | \f | |
137 | ||
9de87eea MV |
138 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
139 | ||
2d3179db | 140 | /* System asyncs. */ |
0f2d19dd | 141 | |
2d3179db MV |
142 | void |
143 | scm_async_click () | |
0f2d19dd | 144 | { |
9de87eea MV |
145 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
146 | SCM asyncs; | |
147 | ||
402858a4 | 148 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
149 | executed since this will avoid future futile calls to this |
150 | function. When asyncs are unblocked again, this function is | |
151 | invoked even when pending_asyncs is zero. | |
402858a4 | 152 | */ |
2d3179db | 153 | |
9de87eea MV |
154 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
155 | t->pending_asyncs = 0; | |
156 | if (t->block_asyncs == 0) | |
2d3179db | 157 | { |
9de87eea MV |
158 | asyncs = t->active_asyncs; |
159 | t->active_asyncs = SCM_EOL; | |
160 | } | |
161 | else | |
162 | asyncs = SCM_EOL; | |
163 | scm_i_pthread_mutex_unlock (&async_mutex); | |
164 | ||
165 | while (scm_is_pair (asyncs)) | |
166 | { | |
167 | SCM next = SCM_CDR (asyncs); | |
168 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
169 | scm_call_0 (SCM_CAR (asyncs)); | |
170 | asyncs = next; | |
2d3179db | 171 | } |
0f2d19dd JB |
172 | } |
173 | ||
100ae50d DH |
174 | #if (SCM_ENABLE_DEPRECATED == 1) |
175 | ||
2d3179db MV |
176 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
177 | (SCM thunk), | |
178 | "This function is deprecated. You can use @var{thunk} directly\n" | |
877f06c3 | 179 | "instead of explicitly creating an async object.\n") |
2d3179db MV |
180 | #define FUNC_NAME s_scm_system_async |
181 | { | |
182 | scm_c_issue_deprecation_warning | |
183 | ("'system-async' is deprecated. " | |
184 | "Use the procedure directly with 'system-async-mark'."); | |
185 | return thunk; | |
186 | } | |
187 | #undef FUNC_NAME | |
0f2d19dd | 188 | |
100ae50d DH |
189 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
190 | ||
2d3179db | 191 | void |
9de87eea | 192 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 193 | { |
9de87eea MV |
194 | SCM sleep_object; |
195 | scm_i_pthread_mutex_t *sleep_mutex; | |
196 | int sleep_fd; | |
197 | SCM p; | |
198 | ||
199 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
200 | p = t->active_asyncs; | |
402858a4 | 201 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
202 | if (!scm_is_pair (p)) |
203 | t->active_asyncs = c; | |
402858a4 | 204 | else |
2d3179db | 205 | { |
402858a4 | 206 | SCM pp; |
9de87eea | 207 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 208 | { |
9de87eea MV |
209 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
210 | { | |
211 | scm_i_pthread_mutex_unlock (&async_mutex); | |
212 | return; | |
213 | } | |
402858a4 | 214 | p = pp; |
f6b44bd9 | 215 | } |
402858a4 | 216 | SCM_SETCDR (p, c); |
2d3179db | 217 | } |
9de87eea MV |
218 | t->pending_asyncs = 1; |
219 | sleep_object = t->sleep_object; | |
220 | sleep_mutex = t->sleep_mutex; | |
221 | sleep_fd = t->sleep_fd; | |
222 | scm_i_pthread_mutex_unlock (&async_mutex); | |
223 | ||
224 | if (sleep_mutex) | |
225 | { | |
226 | /* By now, the thread T might be out of its sleep already, or | |
227 | might even be in the next, unrelated sleep. Interrupting it | |
228 | anyway does no harm, however. | |
229 | ||
230 | The important thing to prevent here is to signal sleep_cond | |
231 | before T waits on it. This can not happen since T has | |
232 | sleep_mutex locked while setting t->sleep_mutex and will only | |
233 | unlock it again while waiting on sleep_cond. | |
234 | */ | |
235 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
236 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
237 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
238 | } | |
239 | ||
240 | if (sleep_fd >= 0) | |
241 | { | |
242 | char dummy = 0; | |
634aa8de | 243 | |
9de87eea MV |
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 | |
634aa8de LC |
248 | condition variable signal. */ |
249 | full_write (sleep_fd, &dummy, 1); | |
9de87eea MV |
250 | } |
251 | ||
252 | /* This is needed to protect sleep_mutex. | |
253 | */ | |
254 | scm_remember_upto_here_1 (sleep_object); | |
255 | } | |
256 | ||
257 | int | |
258 | scm_i_setup_sleep (scm_i_thread *t, | |
259 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
260 | int sleep_fd) | |
261 | { | |
262 | int pending; | |
263 | ||
264 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
265 | pending = t->pending_asyncs; | |
266 | if (!pending) | |
267 | { | |
268 | t->sleep_object = sleep_object; | |
269 | t->sleep_mutex = sleep_mutex; | |
270 | t->sleep_fd = sleep_fd; | |
271 | } | |
272 | scm_i_pthread_mutex_unlock (&async_mutex); | |
273 | return pending; | |
274 | } | |
275 | ||
276 | void | |
277 | scm_i_reset_sleep (scm_i_thread *t) | |
278 | { | |
279 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
280 | t->sleep_object = SCM_BOOL_F; | |
281 | t->sleep_mutex = NULL; | |
282 | t->sleep_fd = -1; | |
283 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 284 | } |
0f2d19dd | 285 | |
2d3179db MV |
286 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
287 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
288 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
289 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
290 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
291 | "If @var{thread} is omitted, the thread that called\n" | |
292 | "@code{system-async-mark} is used.\n\n" | |
293 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
294 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
295 | "signal handlers.") | |
2d3179db MV |
296 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
297 | { | |
9de87eea MV |
298 | /* The current thread might not have a handle yet. This can happen |
299 | when the GC runs immediately before allocating the handle. At | |
300 | the end of that GC, a system async might be marked. Thus, we can | |
301 | not use scm_current_thread here. | |
302 | */ | |
303 | ||
304 | scm_i_thread *t; | |
305 | ||
028e573c | 306 | if (SCM_UNBNDP (thread)) |
9de87eea | 307 | t = SCM_I_CURRENT_THREAD; |
028e573c | 308 | else |
402858a4 MV |
309 | { |
310 | SCM_VALIDATE_THREAD (2, thread); | |
311 | if (scm_c_thread_exited_p (thread)) | |
312 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 313 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 314 | } |
9de87eea | 315 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
316 | return SCM_UNSPECIFIED; |
317 | } | |
318 | #undef FUNC_NAME | |
9f0e55a6 | 319 | |
2d3179db MV |
320 | SCM |
321 | scm_system_async_mark (SCM proc) | |
322 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 323 | { |
2d3179db | 324 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 325 | } |
1bbd0b84 | 326 | #undef FUNC_NAME |
0f2d19dd JB |
327 | |
328 | \f | |
329 | ||
330 | ||
2d3179db MV |
331 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
332 | (SCM args), | |
333 | "Do nothing. When called without arguments, return @code{#f},\n" | |
334 | "otherwise return the first argument.") | |
335 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 336 | { |
2d3179db MV |
337 | SCM_VALIDATE_REST_ARGUMENT (args); |
338 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 339 | } |
1bbd0b84 | 340 | #undef FUNC_NAME |
0f2d19dd | 341 | |
0f2d19dd | 342 | |
0f2d19dd JB |
343 | \f |
344 | ||
100ae50d | 345 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 346 | |
843e4e9d | 347 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
348 | (), |
349 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 350 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 351 | { |
9de87eea MV |
352 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
353 | ||
e292f7aa MV |
354 | scm_c_issue_deprecation_warning |
355 | ("'unmask-signals' is deprecated. " | |
356 | "Use 'call-with-blocked-asyncs' instead."); | |
357 | ||
9de87eea | 358 | if (t->block_asyncs == 0) |
e292f7aa | 359 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 360 | t->block_asyncs = 0; |
402858a4 | 361 | scm_async_click (); |
0f2d19dd JB |
362 | return SCM_UNSPECIFIED; |
363 | } | |
1bbd0b84 | 364 | #undef FUNC_NAME |
0f2d19dd JB |
365 | |
366 | ||
843e4e9d | 367 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
368 | (), |
369 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 370 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 371 | { |
9de87eea MV |
372 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
373 | ||
e292f7aa MV |
374 | scm_c_issue_deprecation_warning |
375 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
376 | ||
9de87eea | 377 | if (t->block_asyncs > 0) |
e292f7aa | 378 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 379 | t->block_asyncs = 1; |
0f2d19dd JB |
380 | return SCM_UNSPECIFIED; |
381 | } | |
1bbd0b84 | 382 | #undef FUNC_NAME |
0f2d19dd | 383 | |
100ae50d | 384 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
385 | |
386 | static void | |
9de87eea | 387 | increase_block (void *data) |
e292f7aa | 388 | { |
9de87eea | 389 | ((scm_i_thread *)data)->block_asyncs++; |
e292f7aa MV |
390 | } |
391 | ||
392 | static void | |
9de87eea | 393 | decrease_block (void *data) |
e292f7aa | 394 | { |
9de87eea | 395 | if (--((scm_i_thread *)data)->block_asyncs == 0) |
402858a4 | 396 | scm_async_click (); |
e292f7aa MV |
397 | } |
398 | ||
399 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, | |
400 | (SCM proc), | |
401 | "Call @var{proc} with no arguments and block the execution\n" | |
402 | "of system asyncs by one level for the current thread while\n" | |
403 | "it is running. Return the value returned by @var{proc}.\n") | |
404 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
405 | { | |
406 | return scm_internal_dynamic_wind (increase_block, | |
407 | (scm_t_inner) scm_call_0, | |
408 | decrease_block, | |
9de87eea MV |
409 | (void *)proc, |
410 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
411 | } |
412 | #undef FUNC_NAME | |
413 | ||
414 | void * | |
415 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
416 | { | |
402858a4 MV |
417 | return (void *)scm_internal_dynamic_wind (increase_block, |
418 | (scm_t_inner) proc, | |
419 | decrease_block, | |
9de87eea MV |
420 | data, |
421 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
422 | } |
423 | ||
424 | ||
425 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
426 | (SCM proc), | |
427 | "Call @var{proc} with no arguments and unblock the execution\n" | |
428 | "of system asyncs by one level for the current thread while\n" | |
429 | "it is running. Return the value returned by @var{proc}.\n") | |
430 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
431 | { | |
9de87eea | 432 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
433 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
434 | return scm_internal_dynamic_wind (decrease_block, | |
435 | (scm_t_inner) scm_call_0, | |
436 | increase_block, | |
9de87eea MV |
437 | (void *)proc, |
438 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
439 | } |
440 | #undef FUNC_NAME | |
441 | ||
442 | void * | |
443 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
444 | { | |
9de87eea | 445 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
446 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
447 | "asyncs already unblocked", SCM_EOL); | |
402858a4 MV |
448 | return (void *)scm_internal_dynamic_wind (decrease_block, |
449 | (scm_t_inner) proc, | |
450 | increase_block, | |
9de87eea MV |
451 | data, |
452 | SCM_I_CURRENT_THREAD); | |
e292f7aa MV |
453 | } |
454 | ||
b57a0953 | 455 | void |
661ae7ab | 456 | scm_dynwind_block_asyncs () |
b57a0953 | 457 | { |
9de87eea | 458 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
661ae7ab MV |
459 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); |
460 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
461 | } |
462 | ||
463 | void | |
661ae7ab | 464 | scm_dynwind_unblock_asyncs () |
b57a0953 | 465 | { |
9de87eea MV |
466 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
467 | if (t->block_asyncs == 0) | |
b57a0953 MV |
468 | scm_misc_error ("scm_with_unblocked_asyncs", |
469 | "asyncs already unblocked", SCM_EOL); | |
661ae7ab MV |
470 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); |
471 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
b57a0953 MV |
472 | } |
473 | ||
46935a1f LC |
474 | \f |
475 | /* These are function variants of the same-named macros (uppercase) for use | |
476 | outside of libguile. This is so that `SCM_I_CURRENT_THREAD', which may | |
477 | reside in TLS, is not accessed from outside of libguile. It thus allows | |
478 | libguile to be built with the "local-dynamic" TLS model. */ | |
479 | ||
480 | void | |
481 | scm_critical_section_start (void) | |
482 | { | |
483 | SCM_CRITICAL_SECTION_START; | |
484 | } | |
485 | ||
486 | void | |
487 | scm_critical_section_end (void) | |
488 | { | |
489 | SCM_CRITICAL_SECTION_END; | |
490 | } | |
491 | ||
492 | void | |
493 | scm_async_tick (void) | |
494 | { | |
495 | SCM_ASYNC_TICK; | |
496 | } | |
b57a0953 | 497 | |
0f2d19dd JB |
498 | \f |
499 | ||
0f2d19dd JB |
500 | void |
501 | scm_init_async () | |
0f2d19dd | 502 | { |
73ea78af | 503 | tc16_async = scm_make_smob_type ("async", 0); |
73ea78af | 504 | |
a0599745 | 505 | #include "libguile/async.x" |
0f2d19dd | 506 | } |
89e00824 ML |
507 | |
508 | /* | |
509 | Local Variables: | |
510 | c-file-style: "gnu" | |
511 | End: | |
512 | */ |