Commit | Line | Data |
---|---|---|
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 () | |
7ad737b6 MD |
263 | { |
264 | #if 0 /* Thread switching code should probably reside here, but the | |
265 | async switching code doesn't seem to work, so it's put in the | |
266 | SCM_ASYNC_TICK macro instead. /mdj */ | |
267 | SCM_THREAD_SWITCHING_CODE; | |
268 | #endif | |
269 | } | |
0f2d19dd JB |
270 | |
271 | ||
1cc91f1b JB |
272 | |
273 | static void scm_deliver_signal SCM_P ((int num)); | |
274 | ||
0f2d19dd JB |
275 | static void |
276 | scm_deliver_signal (num) | |
277 | int num; | |
0f2d19dd JB |
278 | { |
279 | SCM handler; | |
280 | handler = SCM_CDR (handler_var); | |
281 | if (handler != SCM_BOOL_F) | |
282 | scm_apply (handler, SCM_MAKINUM (num), scm_listofnull); | |
283 | else | |
284 | { | |
285 | scm_mask_ints = 0; | |
286 | scm_throw (symbol_signal, | |
287 | scm_listify (SCM_MAKINUM (num), SCM_UNDEFINED)); | |
288 | } | |
289 | } | |
290 | ||
291 | ||
292 | \f | |
293 | ||
1cc91f1b JB |
294 | |
295 | static int print_async SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
296 | ||
0f2d19dd | 297 | static int |
9882ea19 | 298 | print_async (exp, port, pstate) |
0f2d19dd JB |
299 | SCM exp; |
300 | SCM port; | |
9882ea19 | 301 | scm_print_state *pstate; |
0f2d19dd JB |
302 | { |
303 | scm_gen_puts (scm_regular_string, "#<async ", port); | |
304 | scm_intprint(exp, 16, port); | |
305 | scm_gen_putc('>', port); | |
306 | return 1; | |
307 | } | |
308 | ||
1cc91f1b JB |
309 | |
310 | static SCM mark_async SCM_P ((SCM obj)); | |
311 | ||
0f2d19dd JB |
312 | static SCM |
313 | mark_async (obj) | |
314 | SCM obj; | |
0f2d19dd JB |
315 | { |
316 | struct scm_async * it; | |
317 | if (SCM_GC8MARKP (obj)) | |
318 | return SCM_BOOL_F; | |
319 | SCM_SETGC8MARK (obj); | |
320 | it = SCM_ASYNC (obj); | |
321 | return it->thunk; | |
322 | } | |
323 | ||
1cc91f1b JB |
324 | |
325 | static scm_sizet free_async SCM_P ((SCM obj)); | |
326 | ||
0f2d19dd | 327 | static scm_sizet |
1cc91f1b | 328 | free_async (obj) |
0f2d19dd | 329 | SCM obj; |
0f2d19dd JB |
330 | { |
331 | struct scm_async * it; | |
332 | it = SCM_ASYNC (obj); | |
333 | scm_must_free ((char *)it); | |
334 | return (sizeof (*it)); | |
335 | } | |
336 | ||
337 | ||
338 | static scm_smobfuns async_smob = | |
339 | { | |
340 | mark_async, | |
341 | free_async, | |
342 | print_async, | |
343 | 0 | |
344 | }; | |
345 | ||
346 | ||
347 | \f | |
348 | ||
349 | SCM_PROC(s_async, "async", 1, 0, 0, scm_async); | |
1cc91f1b | 350 | |
0f2d19dd JB |
351 | SCM |
352 | scm_async (thunk) | |
353 | SCM thunk; | |
0f2d19dd JB |
354 | { |
355 | SCM it; | |
356 | struct scm_async * async; | |
357 | ||
358 | SCM_NEWCELL (it); | |
359 | SCM_DEFER_INTS; | |
360 | SCM_SETCDR (it, SCM_EOL); | |
361 | async = (struct scm_async *)scm_must_malloc (sizeof (*async), s_async); | |
362 | async->got_it = 0; | |
363 | async->thunk = thunk; | |
364 | SCM_SETCDR (it, (SCM)async); | |
365 | SCM_SETCAR (it, (SCM)scm_tc16_async); | |
366 | SCM_ALLOW_INTS; | |
367 | return it; | |
368 | } | |
369 | ||
370 | SCM_PROC(s_system_async, "system-async", 1, 0, 0, scm_system_async); | |
1cc91f1b | 371 | |
0f2d19dd JB |
372 | SCM |
373 | scm_system_async (thunk) | |
374 | SCM thunk; | |
0f2d19dd JB |
375 | { |
376 | SCM it; | |
377 | SCM list; | |
378 | ||
379 | it = scm_async (thunk); | |
380 | SCM_NEWCELL (list); | |
381 | SCM_DEFER_INTS; | |
382 | SCM_SETCAR (list, it); | |
383 | SCM_SETCDR (list, scm_asyncs); | |
384 | scm_asyncs = list; | |
385 | SCM_ALLOW_INTS; | |
386 | return it; | |
387 | } | |
388 | ||
389 | SCM_PROC(s_async_mark, "async-mark", 1, 0, 0, scm_async_mark); | |
1cc91f1b | 390 | |
0f2d19dd JB |
391 | SCM |
392 | scm_async_mark (a) | |
393 | SCM a; | |
0f2d19dd JB |
394 | { |
395 | struct scm_async * it; | |
396 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark); | |
397 | it = SCM_ASYNC (a); | |
398 | it->got_it = 1; | |
399 | return SCM_UNSPECIFIED; | |
400 | } | |
401 | ||
402 | ||
403 | SCM_PROC(s_system_async_mark, "system-async-mark", 1, 0, 0, scm_system_async_mark); | |
1cc91f1b | 404 | |
0f2d19dd JB |
405 | SCM |
406 | scm_system_async_mark (a) | |
407 | SCM a; | |
0f2d19dd JB |
408 | { |
409 | struct scm_async * it; | |
410 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark); | |
411 | it = SCM_ASYNC (a); | |
412 | SCM_REDEFER_INTS; | |
413 | it->got_it = 1; | |
414 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
415 | scm_async_clock = 1; | |
416 | SCM_REALLOW_INTS; | |
417 | return SCM_UNSPECIFIED; | |
418 | } | |
419 | ||
420 | ||
421 | SCM_PROC(s_run_asyncs, "run-asyncs", 1, 0, 0, scm_run_asyncs); | |
1cc91f1b | 422 | |
0f2d19dd JB |
423 | SCM |
424 | scm_run_asyncs (list_of_a) | |
425 | SCM list_of_a; | |
0f2d19dd JB |
426 | { |
427 | SCM pos; | |
428 | ||
429 | if (scm_mask_ints) | |
430 | return SCM_BOOL_F; | |
431 | pos = list_of_a; | |
432 | while (pos != SCM_EOL) | |
433 | { | |
434 | SCM a; | |
435 | struct scm_async * it; | |
436 | SCM_ASSERT (SCM_NIMP (pos) && SCM_CONSP (pos), pos, SCM_ARG1, s_run_asyncs); | |
437 | a = SCM_CAR (pos); | |
438 | SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_run_asyncs); | |
439 | it = SCM_ASYNC (a); | |
440 | scm_mask_ints = 1; | |
441 | if (it->got_it) | |
442 | { | |
443 | it->got_it = 0; | |
444 | scm_apply (it->thunk, SCM_EOL, SCM_EOL); | |
445 | } | |
446 | scm_mask_ints = 0; | |
447 | pos = SCM_CDR (pos); | |
448 | } | |
449 | return SCM_BOOL_T; | |
450 | } | |
451 | ||
452 | \f | |
453 | ||
454 | ||
455 | SCM_PROC(s_noop, "noop", 0, 0, 1, scm_noop); | |
1cc91f1b | 456 | |
0f2d19dd JB |
457 | SCM |
458 | scm_noop (args) | |
459 | SCM args; | |
0f2d19dd JB |
460 | { |
461 | return (SCM_NULLP (args) | |
462 | ? SCM_BOOL_F | |
463 | : SCM_CAR (args)); | |
464 | } | |
465 | ||
466 | ||
467 | \f | |
468 | ||
469 | SCM_PROC(s_set_tick_rate, "set-tick-rate", 1, 0, 0, scm_set_tick_rate); | |
1cc91f1b | 470 | |
0f2d19dd JB |
471 | SCM |
472 | scm_set_tick_rate (n) | |
473 | SCM n; | |
0f2d19dd JB |
474 | { |
475 | unsigned int old_n; | |
476 | SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_tick_rate); | |
477 | old_n = scm_tick_rate; | |
478 | scm_desired_tick_rate = SCM_INUM (n); | |
479 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
480 | scm_async_clock = 1; | |
481 | return SCM_MAKINUM (old_n); | |
482 | } | |
483 | ||
484 | \f | |
485 | ||
486 | ||
487 | SCM_PROC(s_set_switch_rate, "set-switch-rate", 1, 0, 0, scm_set_switch_rate); | |
1cc91f1b | 488 | |
0f2d19dd JB |
489 | SCM |
490 | scm_set_switch_rate (n) | |
491 | SCM n; | |
0f2d19dd JB |
492 | { |
493 | unsigned int old_n; | |
494 | SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_switch_rate); | |
495 | old_n = scm_switch_rate; | |
496 | scm_desired_switch_rate = SCM_INUM (n); | |
497 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
498 | scm_async_clock = 1; | |
499 | return SCM_MAKINUM (old_n); | |
500 | } | |
501 | ||
502 | \f | |
503 | ||
1cc91f1b JB |
504 | |
505 | static SCM scm_sys_hup_async_thunk SCM_P ((void)); | |
506 | ||
0f2d19dd JB |
507 | static SCM |
508 | scm_sys_hup_async_thunk () | |
0f2d19dd JB |
509 | { |
510 | scm_deliver_signal (SCM_HUP_SIGNAL); | |
511 | return SCM_BOOL_F; | |
512 | } | |
513 | ||
1cc91f1b JB |
514 | |
515 | static SCM scm_sys_int_async_thunk SCM_P ((void)); | |
516 | ||
0f2d19dd JB |
517 | static SCM |
518 | scm_sys_int_async_thunk () | |
0f2d19dd JB |
519 | { |
520 | scm_deliver_signal (SCM_INT_SIGNAL); | |
521 | return SCM_BOOL_F; | |
522 | } | |
523 | ||
1cc91f1b JB |
524 | |
525 | static SCM scm_sys_fpe_async_thunk SCM_P ((void)); | |
526 | ||
0f2d19dd JB |
527 | static SCM |
528 | scm_sys_fpe_async_thunk () | |
0f2d19dd JB |
529 | { |
530 | scm_deliver_signal (SCM_FPE_SIGNAL); | |
531 | return SCM_BOOL_F; | |
532 | } | |
533 | ||
1cc91f1b JB |
534 | |
535 | static SCM scm_sys_bus_async_thunk SCM_P ((void)); | |
536 | ||
0f2d19dd JB |
537 | static SCM |
538 | scm_sys_bus_async_thunk () | |
0f2d19dd JB |
539 | { |
540 | scm_deliver_signal (SCM_BUS_SIGNAL); | |
541 | return SCM_BOOL_F; | |
542 | } | |
543 | ||
1cc91f1b JB |
544 | |
545 | static SCM scm_sys_segv_async_thunk SCM_P ((void)); | |
546 | ||
0f2d19dd JB |
547 | static SCM |
548 | scm_sys_segv_async_thunk () | |
0f2d19dd JB |
549 | { |
550 | scm_deliver_signal (SCM_SEGV_SIGNAL); | |
551 | return SCM_BOOL_F; | |
552 | } | |
553 | ||
1cc91f1b JB |
554 | |
555 | static SCM scm_sys_alrm_async_thunk SCM_P ((void)); | |
556 | ||
0f2d19dd JB |
557 | static SCM |
558 | scm_sys_alrm_async_thunk () | |
0f2d19dd JB |
559 | { |
560 | scm_deliver_signal (SCM_ALRM_SIGNAL); | |
561 | return SCM_BOOL_F; | |
562 | } | |
563 | ||
1cc91f1b JB |
564 | |
565 | static SCM scm_sys_gc_async_thunk SCM_P ((void)); | |
566 | ||
0f2d19dd JB |
567 | static SCM |
568 | scm_sys_gc_async_thunk () | |
0f2d19dd JB |
569 | { |
570 | scm_deliver_signal (SCM_GC_SIGNAL); | |
571 | return SCM_BOOL_F; | |
572 | } | |
573 | ||
1cc91f1b JB |
574 | |
575 | static SCM scm_sys_tick_async_thunk SCM_P ((void)); | |
576 | ||
0f2d19dd JB |
577 | static SCM |
578 | scm_sys_tick_async_thunk () | |
0f2d19dd JB |
579 | { |
580 | scm_deliver_signal (SCM_TICK_SIGNAL); | |
581 | return SCM_BOOL_F; | |
582 | } | |
583 | ||
584 | ||
585 | ||
586 | \f | |
587 | ||
1cc91f1b | 588 | |
0f2d19dd JB |
589 | SCM |
590 | scm_take_signal (n) | |
591 | int n; | |
0f2d19dd JB |
592 | { |
593 | SCM ignored; | |
594 | if (!scm_ints_disabled) | |
595 | { | |
e4d24f3a JB |
596 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer |
597 | interrupts. Instead, it first sets its argument to point to | |
598 | the first cell in the list, and then advances the freelist | |
599 | pointer to the next cell. Now, if this procedure is | |
600 | interrupted, the only anomalous state possible is to have | |
601 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
602 | same cell. To deal with this case, we always throw away the | |
603 | first cell in scm_freelist here. | |
604 | ||
605 | At least, that's the theory. I'm not convinced that that's | |
606 | the only anomalous path we need to worry about. */ | |
607 | SCM_NEWCELL (ignored); | |
0f2d19dd JB |
608 | } |
609 | scm_system_async_mark (system_signal_asyncs[SCM_SIG_ORD(n)]); | |
610 | return SCM_BOOL_F; | |
611 | } | |
612 | ||
613 | \f | |
614 | ||
615 | SCM_PROC(s_unmask_signals, "unmask-signals", 0, 0, 0, scm_unmask_signals); | |
1cc91f1b | 616 | |
0f2d19dd JB |
617 | SCM |
618 | scm_unmask_signals () | |
0f2d19dd JB |
619 | { |
620 | scm_mask_ints = 0; | |
621 | return SCM_UNSPECIFIED; | |
622 | } | |
623 | ||
624 | ||
625 | SCM_PROC(s_mask_signals, "mask-signals", 0, 0, 0, scm_mask_signals); | |
1cc91f1b | 626 | |
0f2d19dd JB |
627 | SCM |
628 | scm_mask_signals () | |
0f2d19dd JB |
629 | { |
630 | scm_mask_ints = 1; | |
631 | return SCM_UNSPECIFIED; | |
632 | } | |
633 | ||
634 | \f | |
635 | ||
1cc91f1b | 636 | |
0f2d19dd JB |
637 | void |
638 | scm_init_async () | |
0f2d19dd JB |
639 | { |
640 | SCM a_thunk; | |
641 | scm_tc16_async = scm_newsmob (&async_smob); | |
ffa19a75 | 642 | symbol_signal = SCM_CAR (scm_sysintern ("signal", SCM_UNDEFINED)); |
0f2d19dd JB |
643 | scm_permanent_object (symbol_signal); |
644 | ||
645 | /* These are in the opposite order of delivery priortity. | |
646 | * | |
647 | * Error conditions are given low priority: | |
648 | */ | |
649 | a_thunk = scm_make_gsubr ("%hup-thunk", 0, 0, 0, scm_sys_hup_async_thunk); | |
650 | system_signal_asyncs[SCM_SIG_ORD(SCM_HUP_SIGNAL)] = scm_system_async (a_thunk); | |
651 | a_thunk = scm_make_gsubr ("%int-thunk", 0, 0, 0, scm_sys_int_async_thunk); | |
652 | system_signal_asyncs[SCM_SIG_ORD(SCM_INT_SIGNAL)] = scm_system_async (a_thunk); | |
653 | a_thunk = scm_make_gsubr ("%fpe-thunk", 0, 0, 0, scm_sys_fpe_async_thunk); | |
654 | system_signal_asyncs[SCM_SIG_ORD(SCM_FPE_SIGNAL)] = scm_system_async (a_thunk); | |
655 | a_thunk = scm_make_gsubr ("%bus-thunk", 0, 0, 0, scm_sys_bus_async_thunk); | |
656 | system_signal_asyncs[SCM_SIG_ORD(SCM_BUS_SIGNAL)] = scm_system_async (a_thunk); | |
657 | a_thunk = scm_make_gsubr ("%segv-thunk", 0, 0, 0, scm_sys_segv_async_thunk); | |
658 | system_signal_asyncs[SCM_SIG_ORD(SCM_SEGV_SIGNAL)] = scm_system_async (a_thunk); | |
659 | ||
660 | ||
661 | a_thunk = scm_make_gsubr ("%gc-thunk", 0, 0, 0, scm_sys_gc_async_thunk); | |
662 | system_signal_asyncs[SCM_SIG_ORD(SCM_GC_SIGNAL)] = scm_system_async (a_thunk); | |
663 | ||
664 | /* Clock and PC driven conditions are given highest priority. */ | |
665 | a_thunk = scm_make_gsubr ("%tick-thunk", 0, 0, 0, scm_sys_tick_async_thunk); | |
666 | system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)] = scm_system_async (a_thunk); | |
667 | a_thunk = scm_make_gsubr ("%alrm-thunk", 0, 0, 0, scm_sys_alrm_async_thunk); | |
668 | system_signal_asyncs[SCM_SIG_ORD(SCM_ALRM_SIGNAL)] = scm_system_async (a_thunk); | |
669 | ||
ffa19a75 | 670 | handler_var = scm_sysintern ("signal-handler", SCM_UNDEFINED); |
0f2d19dd JB |
671 | SCM_SETCDR (handler_var, SCM_BOOL_F); |
672 | scm_permanent_object (handler_var); | |
673 | #include "async.x" | |
674 | } |