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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 | ||
a0599745 MD |
27 | #include "libguile/_scm.h" |
28 | #include "libguile/eval.h" | |
29 | #include "libguile/throw.h" | |
30 | #include "libguile/root.h" | |
31 | #include "libguile/smob.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 | 87 | |
e779fef7 AW |
88 | #define ASYNC_GOT_IT(X) (SCM_SMOB_FLAGS (X)) |
89 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_SMOB_FLAGS ((X), ((V)))) | |
90 | #define ASYNC_THUNK(X) SCM_SMOB_OBJECT_1 (X) | |
0f2d19dd | 91 | |
0f2d19dd | 92 | |
843e4e9d | 93 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
811cf846 MG |
94 | (SCM thunk), |
95 | "Create a new async for the procedure @var{thunk}.") | |
1bbd0b84 | 96 | #define FUNC_NAME s_scm_async |
0f2d19dd | 97 | { |
e94e3f21 | 98 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 99 | } |
1bbd0b84 | 100 | #undef FUNC_NAME |
0f2d19dd | 101 | |
843e4e9d | 102 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 | 103 | (SCM a), |
811cf846 | 104 | "Mark the async @var{a} for future execution.") |
1bbd0b84 | 105 | #define FUNC_NAME s_scm_async_mark |
0f2d19dd | 106 | { |
e94e3f21 | 107 | VALIDATE_ASYNC (1, a); |
e94e3f21 | 108 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
109 | return SCM_UNSPECIFIED; |
110 | } | |
1bbd0b84 | 111 | #undef FUNC_NAME |
0f2d19dd | 112 | |
843e4e9d | 113 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
811cf846 MG |
114 | (SCM list_of_a), |
115 | "Execute all thunks from the asyncs of the list @var{list_of_a}.") | |
1bbd0b84 | 116 | #define FUNC_NAME s_scm_run_asyncs |
0f2d19dd | 117 | { |
c96d76b8 | 118 | while (! SCM_NULL_OR_NIL_P (list_of_a)) |
0f2d19dd JB |
119 | { |
120 | SCM a; | |
9f0e55a6 | 121 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 122 | a = SCM_CAR (list_of_a); |
e94e3f21 | 123 | VALIDATE_ASYNC (SCM_ARG1, a); |
e94e3f21 | 124 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 125 | { |
e94e3f21 | 126 | SET_ASYNC_GOT_IT (a, 0); |
fdc28395 | 127 | scm_call_0 (ASYNC_THUNK (a)); |
0f2d19dd | 128 | } |
1bbd0b84 | 129 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
130 | } |
131 | return SCM_BOOL_T; | |
132 | } | |
1bbd0b84 | 133 | #undef FUNC_NAME |
0f2d19dd JB |
134 | |
135 | \f | |
136 | ||
9de87eea MV |
137 | static scm_i_pthread_mutex_t async_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
138 | ||
2d3179db | 139 | /* System asyncs. */ |
0f2d19dd | 140 | |
2d3179db MV |
141 | void |
142 | scm_async_click () | |
0f2d19dd | 143 | { |
9de87eea MV |
144 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
145 | SCM asyncs; | |
146 | ||
402858a4 | 147 | /* Reset pending_asyncs even when asyncs are blocked and not really |
9de87eea MV |
148 | executed since this will avoid future futile calls to this |
149 | function. When asyncs are unblocked again, this function is | |
150 | invoked even when pending_asyncs is zero. | |
402858a4 | 151 | */ |
2d3179db | 152 | |
9de87eea MV |
153 | scm_i_scm_pthread_mutex_lock (&async_mutex); |
154 | t->pending_asyncs = 0; | |
155 | if (t->block_asyncs == 0) | |
2d3179db | 156 | { |
9de87eea MV |
157 | asyncs = t->active_asyncs; |
158 | t->active_asyncs = SCM_EOL; | |
159 | } | |
160 | else | |
161 | asyncs = SCM_EOL; | |
162 | scm_i_pthread_mutex_unlock (&async_mutex); | |
163 | ||
164 | while (scm_is_pair (asyncs)) | |
165 | { | |
166 | SCM next = SCM_CDR (asyncs); | |
167 | SCM_SETCDR (asyncs, SCM_BOOL_F); | |
168 | scm_call_0 (SCM_CAR (asyncs)); | |
169 | asyncs = next; | |
2d3179db | 170 | } |
0f2d19dd JB |
171 | } |
172 | ||
100ae50d DH |
173 | #if (SCM_ENABLE_DEPRECATED == 1) |
174 | ||
2d3179db MV |
175 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
176 | (SCM thunk), | |
177 | "This function is deprecated. You can use @var{thunk} directly\n" | |
877f06c3 | 178 | "instead of explicitly creating an async object.\n") |
2d3179db MV |
179 | #define FUNC_NAME s_scm_system_async |
180 | { | |
181 | scm_c_issue_deprecation_warning | |
182 | ("'system-async' is deprecated. " | |
183 | "Use the procedure directly with 'system-async-mark'."); | |
184 | return thunk; | |
185 | } | |
186 | #undef FUNC_NAME | |
0f2d19dd | 187 | |
100ae50d DH |
188 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
189 | ||
2d3179db | 190 | void |
9de87eea | 191 | scm_i_queue_async_cell (SCM c, scm_i_thread *t) |
2d3179db | 192 | { |
9de87eea MV |
193 | SCM sleep_object; |
194 | scm_i_pthread_mutex_t *sleep_mutex; | |
195 | int sleep_fd; | |
196 | SCM p; | |
197 | ||
198 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
199 | p = t->active_asyncs; | |
402858a4 | 200 | SCM_SETCDR (c, SCM_EOL); |
9de87eea MV |
201 | if (!scm_is_pair (p)) |
202 | t->active_asyncs = c; | |
402858a4 | 203 | else |
2d3179db | 204 | { |
402858a4 | 205 | SCM pp; |
9de87eea | 206 | while (scm_is_pair (pp = SCM_CDR (p))) |
f6b44bd9 | 207 | { |
9de87eea MV |
208 | if (scm_is_eq (SCM_CAR (p), SCM_CAR (c))) |
209 | { | |
210 | scm_i_pthread_mutex_unlock (&async_mutex); | |
211 | return; | |
212 | } | |
402858a4 | 213 | p = pp; |
f6b44bd9 | 214 | } |
402858a4 | 215 | SCM_SETCDR (p, c); |
2d3179db | 216 | } |
9de87eea MV |
217 | t->pending_asyncs = 1; |
218 | sleep_object = t->sleep_object; | |
219 | sleep_mutex = t->sleep_mutex; | |
220 | sleep_fd = t->sleep_fd; | |
221 | scm_i_pthread_mutex_unlock (&async_mutex); | |
222 | ||
223 | if (sleep_mutex) | |
224 | { | |
225 | /* By now, the thread T might be out of its sleep already, or | |
226 | might even be in the next, unrelated sleep. Interrupting it | |
227 | anyway does no harm, however. | |
228 | ||
229 | The important thing to prevent here is to signal sleep_cond | |
230 | before T waits on it. This can not happen since T has | |
231 | sleep_mutex locked while setting t->sleep_mutex and will only | |
232 | unlock it again while waiting on sleep_cond. | |
233 | */ | |
234 | scm_i_scm_pthread_mutex_lock (sleep_mutex); | |
235 | scm_i_pthread_cond_signal (&t->sleep_cond); | |
236 | scm_i_pthread_mutex_unlock (sleep_mutex); | |
237 | } | |
238 | ||
239 | if (sleep_fd >= 0) | |
240 | { | |
241 | char dummy = 0; | |
634aa8de | 242 | |
9de87eea MV |
243 | /* Likewise, T might already been done with sleeping here, but |
244 | interrupting it once too often does no harm. T might also | |
245 | not yet have started sleeping, but this is no problem either | |
246 | since the data written to a pipe will not be lost, unlike a | |
634aa8de LC |
247 | condition variable signal. */ |
248 | full_write (sleep_fd, &dummy, 1); | |
9de87eea MV |
249 | } |
250 | ||
251 | /* This is needed to protect sleep_mutex. | |
252 | */ | |
253 | scm_remember_upto_here_1 (sleep_object); | |
254 | } | |
255 | ||
256 | int | |
257 | scm_i_setup_sleep (scm_i_thread *t, | |
258 | SCM sleep_object, scm_i_pthread_mutex_t *sleep_mutex, | |
259 | int sleep_fd) | |
260 | { | |
261 | int pending; | |
262 | ||
263 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
264 | pending = t->pending_asyncs; | |
265 | if (!pending) | |
266 | { | |
267 | t->sleep_object = sleep_object; | |
268 | t->sleep_mutex = sleep_mutex; | |
269 | t->sleep_fd = sleep_fd; | |
270 | } | |
271 | scm_i_pthread_mutex_unlock (&async_mutex); | |
272 | return pending; | |
273 | } | |
274 | ||
275 | void | |
276 | scm_i_reset_sleep (scm_i_thread *t) | |
277 | { | |
278 | scm_i_scm_pthread_mutex_lock (&async_mutex); | |
279 | t->sleep_object = SCM_BOOL_F; | |
280 | t->sleep_mutex = NULL; | |
281 | t->sleep_fd = -1; | |
282 | scm_i_pthread_mutex_unlock (&async_mutex); | |
2d3179db | 283 | } |
0f2d19dd | 284 | |
2d3179db MV |
285 | SCM_DEFINE (scm_system_async_mark_for_thread, "system-async-mark", 1, 1, 0, |
286 | (SCM proc, SCM thread), | |
0a50eeaa NJ |
287 | "Mark @var{proc} (a procedure with zero arguments) for future execution\n" |
288 | "in @var{thread}. If @var{proc} has already been marked for\n" | |
289 | "@var{thread} but has not been executed yet, this call has no effect.\n" | |
290 | "If @var{thread} is omitted, the thread that called\n" | |
291 | "@code{system-async-mark} is used.\n\n" | |
292 | "This procedure is not safe to be called from C signal handlers. Use\n" | |
293 | "@code{scm_sigaction} or @code{scm_sigaction_for_thread} to install\n" | |
294 | "signal handlers.") | |
2d3179db MV |
295 | #define FUNC_NAME s_scm_system_async_mark_for_thread |
296 | { | |
9de87eea MV |
297 | /* The current thread might not have a handle yet. This can happen |
298 | when the GC runs immediately before allocating the handle. At | |
299 | the end of that GC, a system async might be marked. Thus, we can | |
300 | not use scm_current_thread here. | |
301 | */ | |
302 | ||
303 | scm_i_thread *t; | |
304 | ||
028e573c | 305 | if (SCM_UNBNDP (thread)) |
9de87eea | 306 | t = SCM_I_CURRENT_THREAD; |
028e573c | 307 | else |
402858a4 MV |
308 | { |
309 | SCM_VALIDATE_THREAD (2, thread); | |
310 | if (scm_c_thread_exited_p (thread)) | |
311 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
9de87eea | 312 | t = SCM_I_THREAD_DATA (thread); |
402858a4 | 313 | } |
9de87eea | 314 | scm_i_queue_async_cell (scm_cons (proc, SCM_BOOL_F), t); |
2d3179db MV |
315 | return SCM_UNSPECIFIED; |
316 | } | |
317 | #undef FUNC_NAME | |
9f0e55a6 | 318 | |
2d3179db MV |
319 | SCM |
320 | scm_system_async_mark (SCM proc) | |
321 | #define FUNC_NAME s_scm_system_async_mark_for_thread | |
0f2d19dd | 322 | { |
2d3179db | 323 | return scm_system_async_mark_for_thread (proc, SCM_UNDEFINED); |
0f2d19dd | 324 | } |
1bbd0b84 | 325 | #undef FUNC_NAME |
0f2d19dd JB |
326 | |
327 | \f | |
328 | ||
329 | ||
2d3179db MV |
330 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
331 | (SCM args), | |
332 | "Do nothing. When called without arguments, return @code{#f},\n" | |
333 | "otherwise return the first argument.") | |
334 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 335 | { |
2d3179db MV |
336 | SCM_VALIDATE_REST_ARGUMENT (args); |
337 | return (SCM_NULL_OR_NIL_P (args) ? SCM_BOOL_F : SCM_CAR (args)); | |
0f2d19dd | 338 | } |
1bbd0b84 | 339 | #undef FUNC_NAME |
0f2d19dd | 340 | |
0f2d19dd | 341 | |
0f2d19dd JB |
342 | \f |
343 | ||
100ae50d | 344 | #if (SCM_ENABLE_DEPRECATED == 1) |
e292f7aa | 345 | |
843e4e9d | 346 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
811cf846 MG |
347 | (), |
348 | "Unmask signals. The returned value is not specified.") | |
1bbd0b84 | 349 | #define FUNC_NAME s_scm_unmask_signals |
0f2d19dd | 350 | { |
9de87eea MV |
351 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
352 | ||
e292f7aa MV |
353 | scm_c_issue_deprecation_warning |
354 | ("'unmask-signals' is deprecated. " | |
355 | "Use 'call-with-blocked-asyncs' instead."); | |
356 | ||
9de87eea | 357 | if (t->block_asyncs == 0) |
e292f7aa | 358 | SCM_MISC_ERROR ("signals already unmasked", SCM_EOL); |
9de87eea | 359 | t->block_asyncs = 0; |
402858a4 | 360 | scm_async_click (); |
0f2d19dd JB |
361 | return SCM_UNSPECIFIED; |
362 | } | |
1bbd0b84 | 363 | #undef FUNC_NAME |
0f2d19dd JB |
364 | |
365 | ||
843e4e9d | 366 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
811cf846 MG |
367 | (), |
368 | "Mask signals. The returned value is not specified.") | |
1bbd0b84 | 369 | #define FUNC_NAME s_scm_mask_signals |
0f2d19dd | 370 | { |
9de87eea MV |
371 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
372 | ||
e292f7aa MV |
373 | scm_c_issue_deprecation_warning |
374 | ("'mask-signals' is deprecated. Use 'call-with-blocked-asyncs' instead."); | |
375 | ||
9de87eea | 376 | if (t->block_asyncs > 0) |
e292f7aa | 377 | SCM_MISC_ERROR ("signals already masked", SCM_EOL); |
9de87eea | 378 | t->block_asyncs = 1; |
0f2d19dd JB |
379 | return SCM_UNSPECIFIED; |
380 | } | |
1bbd0b84 | 381 | #undef FUNC_NAME |
0f2d19dd | 382 | |
100ae50d | 383 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |
e292f7aa MV |
384 | |
385 | static void | |
9de87eea | 386 | increase_block (void *data) |
e292f7aa | 387 | { |
c98ce8f5 AW |
388 | scm_i_thread *t = data; |
389 | t->block_asyncs++; | |
e292f7aa MV |
390 | } |
391 | ||
392 | static void | |
9de87eea | 393 | decrease_block (void *data) |
e292f7aa | 394 | { |
c98ce8f5 AW |
395 | scm_i_thread *t = data; |
396 | if (--t->block_asyncs == 0) | |
402858a4 | 397 | scm_async_click (); |
e292f7aa MV |
398 | } |
399 | ||
c98ce8f5 AW |
400 | void |
401 | scm_dynwind_block_asyncs (void) | |
402 | { | |
403 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
404 | scm_dynwind_rewind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
405 | scm_dynwind_unwind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
406 | } | |
407 | ||
408 | void | |
409 | scm_dynwind_unblock_asyncs (void) | |
410 | { | |
411 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
412 | if (t->block_asyncs == 0) | |
413 | scm_misc_error ("scm_with_unblocked_asyncs", | |
414 | "asyncs already unblocked", SCM_EOL); | |
415 | scm_dynwind_rewind_handler (decrease_block, t, SCM_F_WIND_EXPLICITLY); | |
416 | scm_dynwind_unwind_handler (increase_block, t, SCM_F_WIND_EXPLICITLY); | |
417 | } | |
418 | ||
e292f7aa MV |
419 | SCM_DEFINE (scm_call_with_blocked_asyncs, "call-with-blocked-asyncs", 1, 0, 0, |
420 | (SCM proc), | |
421 | "Call @var{proc} with no arguments and block the execution\n" | |
422 | "of system asyncs by one level for the current thread while\n" | |
423 | "it is running. Return the value returned by @var{proc}.\n") | |
424 | #define FUNC_NAME s_scm_call_with_blocked_asyncs | |
425 | { | |
c98ce8f5 AW |
426 | SCM ans; |
427 | ||
428 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
429 | scm_dynwind_block_asyncs (); | |
430 | ans = scm_call_0 (proc); | |
431 | scm_dynwind_end (); | |
432 | ||
433 | return ans; | |
e292f7aa MV |
434 | } |
435 | #undef FUNC_NAME | |
436 | ||
437 | void * | |
438 | scm_c_call_with_blocked_asyncs (void *(*proc) (void *data), void *data) | |
439 | { | |
c98ce8f5 AW |
440 | void* ans; |
441 | ||
442 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
443 | scm_dynwind_block_asyncs (); | |
444 | ans = proc (data); | |
445 | scm_dynwind_end (); | |
446 | ||
447 | return ans; | |
e292f7aa MV |
448 | } |
449 | ||
450 | ||
451 | SCM_DEFINE (scm_call_with_unblocked_asyncs, "call-with-unblocked-asyncs", 1, 0, 0, | |
452 | (SCM proc), | |
453 | "Call @var{proc} with no arguments and unblock the execution\n" | |
454 | "of system asyncs by one level for the current thread while\n" | |
455 | "it is running. Return the value returned by @var{proc}.\n") | |
456 | #define FUNC_NAME s_scm_call_with_unblocked_asyncs | |
457 | { | |
c98ce8f5 AW |
458 | SCM ans; |
459 | ||
9de87eea | 460 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa | 461 | SCM_MISC_ERROR ("asyncs already unblocked", SCM_EOL); |
c98ce8f5 AW |
462 | |
463 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); | |
464 | scm_dynwind_unblock_asyncs (); | |
465 | ans = scm_call_0 (proc); | |
466 | scm_dynwind_end (); | |
467 | ||
468 | return ans; | |
e292f7aa MV |
469 | } |
470 | #undef FUNC_NAME | |
471 | ||
472 | void * | |
473 | scm_c_call_with_unblocked_asyncs (void *(*proc) (void *data), void *data) | |
474 | { | |
c98ce8f5 AW |
475 | void* ans; |
476 | ||
9de87eea | 477 | if (SCM_I_CURRENT_THREAD->block_asyncs == 0) |
e292f7aa MV |
478 | scm_misc_error ("scm_c_call_with_unblocked_asyncs", |
479 | "asyncs already unblocked", SCM_EOL); | |
e292f7aa | 480 | |
c98ce8f5 AW |
481 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
482 | scm_dynwind_unblock_asyncs (); | |
483 | ans = proc (data); | |
484 | scm_dynwind_end (); | |
b57a0953 | 485 | |
c98ce8f5 | 486 | return ans; |
b57a0953 MV |
487 | } |
488 | ||
46935a1f LC |
489 | \f |
490 | /* These are function variants of the same-named macros (uppercase) for use | |
491 | outside of libguile. This is so that `SCM_I_CURRENT_THREAD', which may | |
492 | reside in TLS, is not accessed from outside of libguile. It thus allows | |
493 | libguile to be built with the "local-dynamic" TLS model. */ | |
494 | ||
495 | void | |
496 | scm_critical_section_start (void) | |
497 | { | |
498 | SCM_CRITICAL_SECTION_START; | |
499 | } | |
500 | ||
501 | void | |
502 | scm_critical_section_end (void) | |
503 | { | |
504 | SCM_CRITICAL_SECTION_END; | |
505 | } | |
506 | ||
507 | void | |
508 | scm_async_tick (void) | |
509 | { | |
510 | SCM_ASYNC_TICK; | |
511 | } | |
b57a0953 | 512 | |
0f2d19dd JB |
513 | \f |
514 | ||
0f2d19dd JB |
515 | void |
516 | scm_init_async () | |
0f2d19dd | 517 | { |
73ea78af | 518 | tc16_async = scm_make_smob_type ("async", 0); |
73ea78af | 519 | |
a0599745 | 520 | #include "libguile/async.x" |
0f2d19dd | 521 | } |
89e00824 ML |
522 | |
523 | /* | |
524 | Local Variables: | |
525 | c-file-style: "gnu" | |
526 | End: | |
527 | */ |