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0f2d19dd JB |
1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | * | |
17 | * As a special exception, the Free Software Foundation gives permission | |
18 | * for additional uses of the text contained in its release of GUILE. | |
19 | * | |
20 | * The exception is that, if you link the GUILE library with other files | |
21 | * to produce an executable, this does not by itself cause the | |
22 | * resulting executable to be covered by the GNU General Public License. | |
23 | * Your use of that executable is in no way restricted on account of | |
24 | * linking the GUILE library code into it. | |
25 | * | |
26 | * This exception does not however invalidate any other reasons why | |
27 | * the executable file might be covered by the GNU General Public License. | |
28 | * | |
29 | * This exception applies only to the code released by the | |
30 | * Free Software Foundation under the name GUILE. If you copy | |
31 | * code from other Free Software Foundation releases into a copy of | |
32 | * GUILE, as the General Public License permits, the exception does | |
33 | * not apply to the code that you add in this way. To avoid misleading | |
34 | * anyone as to the status of such modified files, you must delete | |
35 | * this exception notice from them. | |
36 | * | |
37 | * If you write modifications of your own for GUILE, it is your choice | |
38 | * whether to permit this exception to apply to your modifications. | |
39 | * If you do not wish that, delete this exception notice. | |
40 | */ | |
41 | \f | |
42 | ||
43 | #include <stdio.h> | |
44 | #include <signal.h> | |
45 | #include "_scm.h" | |
20e6290e JB |
46 | #include "eval.h" |
47 | #include "throw.h" | |
48 | #include "smob.h" | |
49 | ||
50 | #include "async.h" | |
0f2d19dd | 51 | |
95b88819 GH |
52 | #ifdef HAVE_STRING_H |
53 | #include <string.h> | |
54 | #endif | |
0f2d19dd JB |
55 | #ifdef HAVE_UNISTD_H |
56 | #include <unistd.h> | |
57 | #endif | |
58 | ||
59 | ||
60 | \f | |
61 | /* {Asynchronous Events} | |
62 | * | |
63 | * | |
64 | * Async == thunk + mark. | |
65 | * | |
66 | * Setting the mark guarantees future execution of the thunk. More | |
67 | * than one set may be satisfied by a single execution. | |
68 | * | |
69 | * scm_tick_clock decremented once per SCM_ALLOW_INTS. | |
70 | * Async execution triggered by SCM_ALLOW_INTS when scm_tick_clock drops to 0. | |
71 | * Async execution prevented by scm_mask_ints != 0. | |
72 | * | |
73 | * If the clock reaches 0 when scm_mask_ints != 0, then reset the clock | |
74 | * to 1. | |
75 | * | |
76 | * If the clock reaches 0 any other time, run marked asyncs. | |
77 | * | |
78 | * From a unix signal handler, mark a corresponding async and set the clock | |
79 | * to 1. Do SCM_REDEFER_INTS;/SCM_REALLOW_INTS so that if the signal handler is not | |
80 | * called in the dynamic scope of a critical section, it is excecuted immediately. | |
81 | * | |
82 | * Overall, closely timed signals of a particular sort may be combined. Pending signals | |
83 | * are delivered in a fixed priority order, regardless of arrival order. | |
84 | * | |
85 | */ | |
86 | ||
87 | ||
0f2d19dd JB |
88 | |
89 | unsigned int scm_async_clock = 20; | |
90 | static unsigned int scm_async_rate = 20; | |
91 | unsigned int scm_mask_ints = 1; | |
92 | ||
93 | static unsigned int scm_tick_clock = 0; | |
94 | static unsigned int scm_tick_rate = 0; | |
95 | static unsigned int scm_desired_tick_rate = 0; | |
96 | static unsigned int scm_switch_clock = 0; | |
97 | static unsigned int scm_switch_rate = 0; | |
98 | static unsigned int scm_desired_switch_rate = 0; | |
99 | ||
100 | static SCM system_signal_asyncs[SCM_NUM_SIGS]; | |
101 | static SCM handler_var; | |
102 | static SCM symbol_signal; | |
103 | ||
104 | ||
105 | struct scm_async | |
106 | { | |
107 | int got_it; /* needs to be delivered? */ | |
108 | SCM thunk; /* the handler. */ | |
109 | }; | |
110 | ||
111 | ||
112 | static long scm_tc16_async; | |
113 | ||
114 | #define SCM_ASYNCP(X) (scm_tc16_async == SCM_GCTYP16 (X)) | |
115 | #define SCM_ASYNC(X) ((struct scm_async *)SCM_CDR (X)) | |
116 | ||
117 | ||
118 | ||
119 | ||
120 | \f | |
121 | ||
1cc91f1b JB |
122 | static int asyncs_pending SCM_P ((void)); |
123 | ||
0f2d19dd JB |
124 | static int |
125 | asyncs_pending () | |
0f2d19dd JB |
126 | { |
127 | SCM pos; | |
128 | pos = scm_asyncs; | |
129 | while (pos != SCM_EOL) | |
130 | { | |
131 | SCM a; | |
132 | struct scm_async * it; | |
133 | a = SCM_CAR (pos); | |
134 | it = SCM_ASYNC (a); | |
135 | if (it->got_it) | |
136 | return 1; | |
137 | pos = SCM_CDR (pos); | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
142 | ||
1cc91f1b | 143 | |
0f2d19dd JB |
144 | void |
145 | scm_async_click () | |
0f2d19dd JB |
146 | { |
147 | int owe_switch; | |
148 | int owe_tick; | |
149 | ||
150 | if (!scm_switch_rate) | |
151 | { | |
152 | owe_switch = 0; | |
153 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
154 | scm_desired_switch_rate = 0; | |
155 | } | |
156 | else | |
157 | { | |
158 | owe_switch = (scm_async_rate >= scm_switch_clock); | |
159 | if (owe_switch) | |
160 | { | |
161 | if (scm_desired_switch_rate) | |
162 | { | |
163 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
164 | scm_desired_switch_rate = 0; | |
165 | } | |
166 | else | |
167 | scm_switch_clock = scm_switch_rate; | |
168 | } | |
169 | else | |
170 | { | |
171 | if (scm_desired_switch_rate) | |
172 | { | |
173 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
174 | scm_desired_switch_rate = 0; | |
175 | } | |
176 | else | |
177 | scm_switch_clock -= scm_async_rate; | |
178 | } | |
179 | } | |
180 | ||
181 | if (scm_mask_ints) | |
182 | { | |
183 | if (owe_switch) | |
184 | scm_switch (); | |
185 | scm_async_clock = 1; | |
186 | return;; | |
187 | } | |
188 | ||
189 | if (!scm_tick_rate) | |
190 | { | |
191 | unsigned int r; | |
192 | owe_tick = 0; | |
193 | r = scm_desired_tick_rate; | |
194 | if (r) | |
195 | { | |
196 | scm_desired_tick_rate = 0; | |
197 | scm_tick_rate = r; | |
198 | scm_tick_clock = r; | |
199 | } | |
200 | } | |
201 | else | |
202 | { | |
203 | owe_tick = (scm_async_rate >= scm_tick_clock); | |
204 | if (owe_tick) | |
205 | { | |
206 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
207 | scm_desired_tick_rate = 0; | |
208 | } | |
209 | else | |
210 | { | |
211 | if (scm_desired_tick_rate) | |
212 | { | |
213 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
214 | scm_desired_tick_rate = 0; | |
215 | } | |
216 | else | |
217 | scm_tick_clock -= scm_async_rate; | |
218 | } | |
219 | } | |
220 | ||
221 | if (owe_tick) | |
222 | scm_async_mark (system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)]); | |
223 | ||
224 | SCM_DEFER_INTS; | |
225 | if (scm_tick_rate && scm_switch_rate) | |
226 | { | |
227 | scm_async_rate = min (scm_tick_clock, scm_switch_clock); | |
228 | scm_async_clock = scm_async_rate; | |
229 | } | |
230 | else if (scm_tick_rate) | |
231 | { | |
232 | scm_async_clock = scm_async_rate = scm_tick_clock; | |
233 | } | |
234 | else if (scm_switch_rate) | |
235 | { | |
236 | scm_async_clock = scm_async_rate = scm_switch_clock; | |
237 | } | |
238 | else | |
239 | scm_async_clock = scm_async_rate = 1 << 16; | |
240 | SCM_ALLOW_INTS_ONLY; | |
241 | ||
242 | tail: | |
243 | scm_run_asyncs (scm_asyncs); | |
244 | ||
245 | SCM_DEFER_INTS; | |
246 | if (asyncs_pending ()) | |
247 | { | |
248 | SCM_ALLOW_INTS_ONLY; | |
249 | goto tail; | |
250 | } | |
251 | SCM_ALLOW_INTS; | |
252 | ||
253 | if (owe_switch) | |
254 | scm_switch (); | |
255 | } | |
256 | ||
257 | ||
258 | \f | |
259 | ||
1cc91f1b | 260 | |
0f2d19dd JB |
261 | void |
262 | scm_switch () | |
0f2d19dd JB |
263 | {} |
264 | ||
265 | ||
1cc91f1b JB |
266 | |
267 | static void scm_deliver_signal SCM_P ((int num)); | |
268 | ||
0f2d19dd JB |
269 | static void |
270 | scm_deliver_signal (num) | |
271 | int num; | |
0f2d19dd JB |
272 | { |
273 | SCM handler; | |
274 | handler = SCM_CDR (handler_var); | |
275 | if (handler != SCM_BOOL_F) | |
276 | scm_apply (handler, SCM_MAKINUM (num), scm_listofnull); | |
277 | else | |
278 | { | |
279 | scm_mask_ints = 0; | |
280 | scm_throw (symbol_signal, | |
281 | scm_listify (SCM_MAKINUM (num), SCM_UNDEFINED)); | |
282 | } | |
283 | } | |
284 | ||
285 | ||
286 | \f | |
287 | ||
1cc91f1b JB |
288 | |
289 | static int print_async SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
290 | ||
0f2d19dd | 291 | static int |
9882ea19 | 292 | print_async (exp, port, pstate) |
0f2d19dd JB |
293 | SCM exp; |
294 | SCM port; | |
9882ea19 | 295 | scm_print_state *pstate; |
0f2d19dd JB |
296 | { |
297 | scm_gen_puts (scm_regular_string, "#<async ", port); | |
298 | scm_intprint(exp, 16, port); | |
299 | scm_gen_putc('>', port); | |
300 | return 1; | |
301 | } | |
302 | ||
1cc91f1b JB |
303 | |
304 | static SCM mark_async SCM_P ((SCM obj)); | |
305 | ||
0f2d19dd JB |
306 | static SCM |
307 | mark_async (obj) | |
308 | SCM obj; | |
0f2d19dd JB |
309 | { |
310 | struct scm_async * it; | |
311 | if (SCM_GC8MARKP (obj)) | |
312 | return SCM_BOOL_F; | |
313 | SCM_SETGC8MARK (obj); | |
314 | it = SCM_ASYNC (obj); | |
315 | return it->thunk; | |
316 | } | |
317 | ||
1cc91f1b JB |
318 | |
319 | static scm_sizet free_async SCM_P ((SCM obj)); | |
320 | ||
0f2d19dd | 321 | static scm_sizet |
1cc91f1b | 322 | free_async (obj) |
0f2d19dd | 323 | SCM obj; |
0f2d19dd JB |
324 | { |
325 | struct scm_async * it; | |
326 | it = SCM_ASYNC (obj); | |
327 | scm_must_free ((char *)it); | |
328 | return (sizeof (*it)); | |
329 | } | |
330 | ||
331 | ||
332 | static scm_smobfuns async_smob = | |
333 | { | |
334 | mark_async, | |
335 | free_async, | |
336 | print_async, | |
337 | 0 | |
338 | }; | |
339 | ||
340 | ||
341 | \f | |
342 | ||
343 | SCM_PROC(s_async, "async", 1, 0, 0, scm_async); | |
1cc91f1b | 344 | |
0f2d19dd JB |
345 | SCM |
346 | scm_async (thunk) | |
347 | SCM thunk; | |
0f2d19dd JB |
348 | { |
349 | SCM it; | |
350 | struct scm_async * async; | |
351 | ||
352 | SCM_NEWCELL (it); | |
353 | SCM_DEFER_INTS; | |
354 | SCM_SETCDR (it, SCM_EOL); | |
355 | async = (struct scm_async *)scm_must_malloc (sizeof (*async), s_async); | |
356 | async->got_it = 0; | |
357 | async->thunk = thunk; | |
358 | SCM_SETCDR (it, (SCM)async); | |
359 | SCM_SETCAR (it, (SCM)scm_tc16_async); | |
360 | SCM_ALLOW_INTS; | |
361 | return it; | |
362 | } | |
363 | ||
364 | SCM_PROC(s_system_async, "system-async", 1, 0, 0, scm_system_async); | |
1cc91f1b | 365 | |
0f2d19dd JB |
366 | SCM |
367 | scm_system_async (thunk) | |
368 | SCM thunk; | |
0f2d19dd JB |
369 | { |
370 | SCM it; | |
371 | SCM list; | |
372 | ||
373 | it = scm_async (thunk); | |
374 | SCM_NEWCELL (list); | |
375 | SCM_DEFER_INTS; | |
376 | SCM_SETCAR (list, it); | |
377 | SCM_SETCDR (list, scm_asyncs); | |
378 | scm_asyncs = list; | |
379 | SCM_ALLOW_INTS; | |
380 | return it; | |
381 | } | |
382 | ||
383 | SCM_PROC(s_async_mark, "async-mark", 1, 0, 0, scm_async_mark); | |
1cc91f1b | 384 | |
0f2d19dd JB |
385 | SCM |
386 | scm_async_mark (a) | |
387 | SCM a; | |
0f2d19dd JB |
388 | { |
389 | struct scm_async * it; | |
390 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark); | |
391 | it = SCM_ASYNC (a); | |
392 | it->got_it = 1; | |
393 | return SCM_UNSPECIFIED; | |
394 | } | |
395 | ||
396 | ||
397 | SCM_PROC(s_system_async_mark, "system-async-mark", 1, 0, 0, scm_system_async_mark); | |
1cc91f1b | 398 | |
0f2d19dd JB |
399 | SCM |
400 | scm_system_async_mark (a) | |
401 | SCM a; | |
0f2d19dd JB |
402 | { |
403 | struct scm_async * it; | |
404 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark); | |
405 | it = SCM_ASYNC (a); | |
406 | SCM_REDEFER_INTS; | |
407 | it->got_it = 1; | |
408 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
409 | scm_async_clock = 1; | |
410 | SCM_REALLOW_INTS; | |
411 | return SCM_UNSPECIFIED; | |
412 | } | |
413 | ||
414 | ||
415 | SCM_PROC(s_run_asyncs, "run-asyncs", 1, 0, 0, scm_run_asyncs); | |
1cc91f1b | 416 | |
0f2d19dd JB |
417 | SCM |
418 | scm_run_asyncs (list_of_a) | |
419 | SCM list_of_a; | |
0f2d19dd JB |
420 | { |
421 | SCM pos; | |
422 | ||
423 | if (scm_mask_ints) | |
424 | return SCM_BOOL_F; | |
425 | pos = list_of_a; | |
426 | while (pos != SCM_EOL) | |
427 | { | |
428 | SCM a; | |
429 | struct scm_async * it; | |
430 | SCM_ASSERT (SCM_NIMP (pos) && SCM_CONSP (pos), pos, SCM_ARG1, s_run_asyncs); | |
431 | a = SCM_CAR (pos); | |
432 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_run_asyncs); | |
433 | it = SCM_ASYNC (a); | |
434 | scm_mask_ints = 1; | |
435 | if (it->got_it) | |
436 | { | |
437 | it->got_it = 0; | |
438 | scm_apply (it->thunk, SCM_EOL, SCM_EOL); | |
439 | } | |
440 | scm_mask_ints = 0; | |
441 | pos = SCM_CDR (pos); | |
442 | } | |
443 | return SCM_BOOL_T; | |
444 | } | |
445 | ||
446 | \f | |
447 | ||
448 | ||
449 | SCM_PROC(s_noop, "noop", 0, 0, 1, scm_noop); | |
1cc91f1b | 450 | |
0f2d19dd JB |
451 | SCM |
452 | scm_noop (args) | |
453 | SCM args; | |
0f2d19dd JB |
454 | { |
455 | return (SCM_NULLP (args) | |
456 | ? SCM_BOOL_F | |
457 | : SCM_CAR (args)); | |
458 | } | |
459 | ||
460 | ||
461 | \f | |
462 | ||
463 | SCM_PROC(s_set_tick_rate, "set-tick-rate", 1, 0, 0, scm_set_tick_rate); | |
1cc91f1b | 464 | |
0f2d19dd JB |
465 | SCM |
466 | scm_set_tick_rate (n) | |
467 | SCM n; | |
0f2d19dd JB |
468 | { |
469 | unsigned int old_n; | |
470 | SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_tick_rate); | |
471 | old_n = scm_tick_rate; | |
472 | scm_desired_tick_rate = SCM_INUM (n); | |
473 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
474 | scm_async_clock = 1; | |
475 | return SCM_MAKINUM (old_n); | |
476 | } | |
477 | ||
478 | \f | |
479 | ||
480 | ||
481 | SCM_PROC(s_set_switch_rate, "set-switch-rate", 1, 0, 0, scm_set_switch_rate); | |
1cc91f1b | 482 | |
0f2d19dd JB |
483 | SCM |
484 | scm_set_switch_rate (n) | |
485 | SCM n; | |
0f2d19dd JB |
486 | { |
487 | unsigned int old_n; | |
488 | SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_switch_rate); | |
489 | old_n = scm_switch_rate; | |
490 | scm_desired_switch_rate = SCM_INUM (n); | |
491 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
492 | scm_async_clock = 1; | |
493 | return SCM_MAKINUM (old_n); | |
494 | } | |
495 | ||
496 | \f | |
497 | ||
1cc91f1b JB |
498 | |
499 | static SCM scm_sys_hup_async_thunk SCM_P ((void)); | |
500 | ||
0f2d19dd JB |
501 | static SCM |
502 | scm_sys_hup_async_thunk () | |
0f2d19dd JB |
503 | { |
504 | scm_deliver_signal (SCM_HUP_SIGNAL); | |
505 | return SCM_BOOL_F; | |
506 | } | |
507 | ||
1cc91f1b JB |
508 | |
509 | static SCM scm_sys_int_async_thunk SCM_P ((void)); | |
510 | ||
0f2d19dd JB |
511 | static SCM |
512 | scm_sys_int_async_thunk () | |
0f2d19dd JB |
513 | { |
514 | scm_deliver_signal (SCM_INT_SIGNAL); | |
515 | return SCM_BOOL_F; | |
516 | } | |
517 | ||
1cc91f1b JB |
518 | |
519 | static SCM scm_sys_fpe_async_thunk SCM_P ((void)); | |
520 | ||
0f2d19dd JB |
521 | static SCM |
522 | scm_sys_fpe_async_thunk () | |
0f2d19dd JB |
523 | { |
524 | scm_deliver_signal (SCM_FPE_SIGNAL); | |
525 | return SCM_BOOL_F; | |
526 | } | |
527 | ||
1cc91f1b JB |
528 | |
529 | static SCM scm_sys_bus_async_thunk SCM_P ((void)); | |
530 | ||
0f2d19dd JB |
531 | static SCM |
532 | scm_sys_bus_async_thunk () | |
0f2d19dd JB |
533 | { |
534 | scm_deliver_signal (SCM_BUS_SIGNAL); | |
535 | return SCM_BOOL_F; | |
536 | } | |
537 | ||
1cc91f1b JB |
538 | |
539 | static SCM scm_sys_segv_async_thunk SCM_P ((void)); | |
540 | ||
0f2d19dd JB |
541 | static SCM |
542 | scm_sys_segv_async_thunk () | |
0f2d19dd JB |
543 | { |
544 | scm_deliver_signal (SCM_SEGV_SIGNAL); | |
545 | return SCM_BOOL_F; | |
546 | } | |
547 | ||
1cc91f1b JB |
548 | |
549 | static SCM scm_sys_alrm_async_thunk SCM_P ((void)); | |
550 | ||
0f2d19dd JB |
551 | static SCM |
552 | scm_sys_alrm_async_thunk () | |
0f2d19dd JB |
553 | { |
554 | scm_deliver_signal (SCM_ALRM_SIGNAL); | |
555 | return SCM_BOOL_F; | |
556 | } | |
557 | ||
1cc91f1b JB |
558 | |
559 | static SCM scm_sys_gc_async_thunk SCM_P ((void)); | |
560 | ||
0f2d19dd JB |
561 | static SCM |
562 | scm_sys_gc_async_thunk () | |
0f2d19dd JB |
563 | { |
564 | scm_deliver_signal (SCM_GC_SIGNAL); | |
565 | return SCM_BOOL_F; | |
566 | } | |
567 | ||
1cc91f1b JB |
568 | |
569 | static SCM scm_sys_tick_async_thunk SCM_P ((void)); | |
570 | ||
0f2d19dd JB |
571 | static SCM |
572 | scm_sys_tick_async_thunk () | |
0f2d19dd JB |
573 | { |
574 | scm_deliver_signal (SCM_TICK_SIGNAL); | |
575 | return SCM_BOOL_F; | |
576 | } | |
577 | ||
578 | ||
579 | ||
580 | \f | |
581 | ||
1cc91f1b | 582 | |
0f2d19dd JB |
583 | SCM |
584 | scm_take_signal (n) | |
585 | int n; | |
0f2d19dd JB |
586 | { |
587 | SCM ignored; | |
588 | if (!scm_ints_disabled) | |
589 | { | |
e4d24f3a JB |
590 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer |
591 | interrupts. Instead, it first sets its argument to point to | |
592 | the first cell in the list, and then advances the freelist | |
593 | pointer to the next cell. Now, if this procedure is | |
594 | interrupted, the only anomalous state possible is to have | |
595 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
596 | same cell. To deal with this case, we always throw away the | |
597 | first cell in scm_freelist here. | |
598 | ||
599 | At least, that's the theory. I'm not convinced that that's | |
600 | the only anomalous path we need to worry about. */ | |
601 | SCM_NEWCELL (ignored); | |
0f2d19dd JB |
602 | } |
603 | scm_system_async_mark (system_signal_asyncs[SCM_SIG_ORD(n)]); | |
604 | return SCM_BOOL_F; | |
605 | } | |
606 | ||
607 | \f | |
608 | ||
609 | SCM_PROC(s_unmask_signals, "unmask-signals", 0, 0, 0, scm_unmask_signals); | |
1cc91f1b | 610 | |
0f2d19dd JB |
611 | SCM |
612 | scm_unmask_signals () | |
0f2d19dd JB |
613 | { |
614 | scm_mask_ints = 0; | |
615 | return SCM_UNSPECIFIED; | |
616 | } | |
617 | ||
618 | ||
619 | SCM_PROC(s_mask_signals, "mask-signals", 0, 0, 0, scm_mask_signals); | |
1cc91f1b | 620 | |
0f2d19dd JB |
621 | SCM |
622 | scm_mask_signals () | |
0f2d19dd JB |
623 | { |
624 | scm_mask_ints = 1; | |
625 | return SCM_UNSPECIFIED; | |
626 | } | |
627 | ||
628 | \f | |
629 | ||
1cc91f1b | 630 | |
0f2d19dd JB |
631 | void |
632 | scm_init_async () | |
0f2d19dd JB |
633 | { |
634 | SCM a_thunk; | |
635 | scm_tc16_async = scm_newsmob (&async_smob); | |
ffa19a75 | 636 | symbol_signal = SCM_CAR (scm_sysintern ("signal", SCM_UNDEFINED)); |
0f2d19dd JB |
637 | scm_permanent_object (symbol_signal); |
638 | ||
639 | /* These are in the opposite order of delivery priortity. | |
640 | * | |
641 | * Error conditions are given low priority: | |
642 | */ | |
643 | a_thunk = scm_make_gsubr ("%hup-thunk", 0, 0, 0, scm_sys_hup_async_thunk); | |
644 | system_signal_asyncs[SCM_SIG_ORD(SCM_HUP_SIGNAL)] = scm_system_async (a_thunk); | |
645 | a_thunk = scm_make_gsubr ("%int-thunk", 0, 0, 0, scm_sys_int_async_thunk); | |
646 | system_signal_asyncs[SCM_SIG_ORD(SCM_INT_SIGNAL)] = scm_system_async (a_thunk); | |
647 | a_thunk = scm_make_gsubr ("%fpe-thunk", 0, 0, 0, scm_sys_fpe_async_thunk); | |
648 | system_signal_asyncs[SCM_SIG_ORD(SCM_FPE_SIGNAL)] = scm_system_async (a_thunk); | |
649 | a_thunk = scm_make_gsubr ("%bus-thunk", 0, 0, 0, scm_sys_bus_async_thunk); | |
650 | system_signal_asyncs[SCM_SIG_ORD(SCM_BUS_SIGNAL)] = scm_system_async (a_thunk); | |
651 | a_thunk = scm_make_gsubr ("%segv-thunk", 0, 0, 0, scm_sys_segv_async_thunk); | |
652 | system_signal_asyncs[SCM_SIG_ORD(SCM_SEGV_SIGNAL)] = scm_system_async (a_thunk); | |
653 | ||
654 | ||
655 | a_thunk = scm_make_gsubr ("%gc-thunk", 0, 0, 0, scm_sys_gc_async_thunk); | |
656 | system_signal_asyncs[SCM_SIG_ORD(SCM_GC_SIGNAL)] = scm_system_async (a_thunk); | |
657 | ||
658 | /* Clock and PC driven conditions are given highest priority. */ | |
659 | a_thunk = scm_make_gsubr ("%tick-thunk", 0, 0, 0, scm_sys_tick_async_thunk); | |
660 | system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)] = scm_system_async (a_thunk); | |
661 | a_thunk = scm_make_gsubr ("%alrm-thunk", 0, 0, 0, scm_sys_alrm_async_thunk); | |
662 | system_signal_asyncs[SCM_SIG_ORD(SCM_ALRM_SIGNAL)] = scm_system_async (a_thunk); | |
663 | ||
ffa19a75 | 664 | handler_var = scm_sysintern ("signal-handler", SCM_UNDEFINED); |
0f2d19dd JB |
665 | SCM_SETCDR (handler_var, SCM_BOOL_F); |
666 | scm_permanent_object (handler_var); | |
667 | #include "async.x" | |
668 | } |