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273b7b94 | 1 | /* Copyright (C) 1995, 96, 97, 98, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
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 | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
48 | #include <signal.h> | |
49 | #include "_scm.h" | |
20e6290e JB |
50 | #include "eval.h" |
51 | #include "throw.h" | |
ba11fd4c | 52 | #include "root.h" |
20e6290e JB |
53 | #include "smob.h" |
54 | ||
b6791b2e | 55 | #include "validate.h" |
20e6290e | 56 | #include "async.h" |
0f2d19dd | 57 | |
95b88819 GH |
58 | #ifdef HAVE_STRING_H |
59 | #include <string.h> | |
60 | #endif | |
0f2d19dd JB |
61 | #ifdef HAVE_UNISTD_H |
62 | #include <unistd.h> | |
63 | #endif | |
64 | ||
65 | ||
66 | \f | |
67 | /* {Asynchronous Events} | |
68 | * | |
69 | * | |
70 | * Async == thunk + mark. | |
71 | * | |
72 | * Setting the mark guarantees future execution of the thunk. More | |
73 | * than one set may be satisfied by a single execution. | |
74 | * | |
75 | * scm_tick_clock decremented once per SCM_ALLOW_INTS. | |
76 | * Async execution triggered by SCM_ALLOW_INTS when scm_tick_clock drops to 0. | |
77 | * Async execution prevented by scm_mask_ints != 0. | |
78 | * | |
79 | * If the clock reaches 0 when scm_mask_ints != 0, then reset the clock | |
80 | * to 1. | |
81 | * | |
82 | * If the clock reaches 0 any other time, run marked asyncs. | |
83 | * | |
84 | * From a unix signal handler, mark a corresponding async and set the clock | |
85 | * to 1. Do SCM_REDEFER_INTS;/SCM_REALLOW_INTS so that if the signal handler is not | |
86 | * called in the dynamic scope of a critical section, it is excecuted immediately. | |
87 | * | |
88 | * Overall, closely timed signals of a particular sort may be combined. Pending signals | |
89 | * are delivered in a fixed priority order, regardless of arrival order. | |
90 | * | |
91 | */ | |
92 | ||
a574455a GH |
93 | /* True between SCM_DEFER_INTS and SCM_ALLOW_INTS, and |
94 | * when the interpreter is not running at all. | |
95 | */ | |
96 | int scm_ints_disabled = 1; | |
9f0e55a6 | 97 | unsigned int scm_mask_ints = 1; |
0f2d19dd | 98 | |
9f0e55a6 | 99 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
100 | unsigned int scm_async_clock = 20; |
101 | static unsigned int scm_async_rate = 20; | |
0f2d19dd JB |
102 | |
103 | static unsigned int scm_tick_clock = 0; | |
104 | static unsigned int scm_tick_rate = 0; | |
105 | static unsigned int scm_desired_tick_rate = 0; | |
106 | static unsigned int scm_switch_clock = 0; | |
107 | static unsigned int scm_switch_rate = 0; | |
108 | static unsigned int scm_desired_switch_rate = 0; | |
9f0e55a6 MD |
109 | #else |
110 | int scm_asyncs_pending_p = 0; | |
111 | #endif | |
0f2d19dd | 112 | |
0f2d19dd JB |
113 | static long scm_tc16_async; |
114 | ||
0f2d19dd JB |
115 | \f |
116 | ||
9f0e55a6 | 117 | #ifdef GUILE_OLD_ASYNC_CLICK |
5e569ca8 MD |
118 | int |
119 | scm_asyncs_pending () | |
0f2d19dd JB |
120 | { |
121 | SCM pos; | |
122 | pos = scm_asyncs; | |
123 | while (pos != SCM_EOL) | |
124 | { | |
125 | SCM a; | |
126 | struct scm_async * it; | |
127 | a = SCM_CAR (pos); | |
128 | it = SCM_ASYNC (a); | |
129 | if (it->got_it) | |
130 | return 1; | |
131 | pos = SCM_CDR (pos); | |
132 | } | |
133 | return 0; | |
134 | } | |
135 | ||
9ea54cc6 | 136 | static SCM |
1bbd0b84 | 137 | scm_sys_tick_async_thunk (void) |
9ea54cc6 GH |
138 | { |
139 | scm_deliver_signal (SCM_TICK_SIGNAL); | |
140 | return SCM_BOOL_F; | |
141 | } | |
1cc91f1b | 142 | |
0f2d19dd JB |
143 | void |
144 | scm_async_click () | |
0f2d19dd JB |
145 | { |
146 | int owe_switch; | |
147 | int owe_tick; | |
148 | ||
149 | if (!scm_switch_rate) | |
150 | { | |
151 | owe_switch = 0; | |
152 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
153 | scm_desired_switch_rate = 0; | |
154 | } | |
155 | else | |
156 | { | |
157 | owe_switch = (scm_async_rate >= scm_switch_clock); | |
158 | if (owe_switch) | |
159 | { | |
160 | if (scm_desired_switch_rate) | |
161 | { | |
162 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
163 | scm_desired_switch_rate = 0; | |
164 | } | |
165 | else | |
166 | scm_switch_clock = scm_switch_rate; | |
167 | } | |
168 | else | |
169 | { | |
170 | if (scm_desired_switch_rate) | |
171 | { | |
172 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
173 | scm_desired_switch_rate = 0; | |
174 | } | |
175 | else | |
176 | scm_switch_clock -= scm_async_rate; | |
177 | } | |
178 | } | |
179 | ||
180 | if (scm_mask_ints) | |
181 | { | |
182 | if (owe_switch) | |
183 | scm_switch (); | |
184 | scm_async_clock = 1; | |
185 | return;; | |
186 | } | |
187 | ||
188 | if (!scm_tick_rate) | |
189 | { | |
190 | unsigned int r; | |
191 | owe_tick = 0; | |
192 | r = scm_desired_tick_rate; | |
193 | if (r) | |
194 | { | |
195 | scm_desired_tick_rate = 0; | |
196 | scm_tick_rate = r; | |
197 | scm_tick_clock = r; | |
198 | } | |
199 | } | |
200 | else | |
201 | { | |
202 | owe_tick = (scm_async_rate >= scm_tick_clock); | |
203 | if (owe_tick) | |
204 | { | |
205 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
206 | scm_desired_tick_rate = 0; | |
207 | } | |
208 | else | |
209 | { | |
210 | if (scm_desired_tick_rate) | |
211 | { | |
212 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
213 | scm_desired_tick_rate = 0; | |
214 | } | |
215 | else | |
216 | scm_tick_clock -= scm_async_rate; | |
217 | } | |
218 | } | |
219 | ||
9ea54cc6 GH |
220 | /* |
221 | if (owe_tick) | |
222 | scm_async_mark (system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)]); | |
223 | */ | |
0f2d19dd JB |
224 | |
225 | SCM_DEFER_INTS; | |
226 | if (scm_tick_rate && scm_switch_rate) | |
227 | { | |
228 | scm_async_rate = min (scm_tick_clock, scm_switch_clock); | |
229 | scm_async_clock = scm_async_rate; | |
230 | } | |
231 | else if (scm_tick_rate) | |
232 | { | |
233 | scm_async_clock = scm_async_rate = scm_tick_clock; | |
234 | } | |
235 | else if (scm_switch_rate) | |
236 | { | |
237 | scm_async_clock = scm_async_rate = scm_switch_clock; | |
238 | } | |
239 | else | |
240 | scm_async_clock = scm_async_rate = 1 << 16; | |
241 | SCM_ALLOW_INTS_ONLY; | |
242 | ||
243 | tail: | |
244 | scm_run_asyncs (scm_asyncs); | |
245 | ||
246 | SCM_DEFER_INTS; | |
5e569ca8 | 247 | if (scm_asyncs_pending ()) |
0f2d19dd JB |
248 | { |
249 | SCM_ALLOW_INTS_ONLY; | |
250 | goto tail; | |
251 | } | |
252 | SCM_ALLOW_INTS; | |
253 | ||
254 | if (owe_switch) | |
255 | scm_switch (); | |
256 | } | |
257 | ||
9f0e55a6 MD |
258 | #else |
259 | ||
260 | void | |
261 | scm_async_click () | |
262 | { | |
263 | if (!scm_mask_ints) | |
264 | do | |
265 | scm_run_asyncs (scm_asyncs); | |
266 | while (scm_asyncs_pending_p); | |
267 | } | |
268 | #endif | |
0f2d19dd JB |
269 | |
270 | \f | |
271 | ||
1cc91f1b | 272 | |
9f0e55a6 MD |
273 | #if 0 /* Thread switching code should probably reside here, but the |
274 | async switching code doesn't seem to work, so it's put in the | |
275 | SCM_DEFER_INTS macro instead. /mdj */ | |
0f2d19dd JB |
276 | void |
277 | scm_switch () | |
7ad737b6 | 278 | { |
7ad737b6 | 279 | SCM_THREAD_SWITCHING_CODE; |
7ad737b6 | 280 | } |
9f0e55a6 | 281 | #endif |
0f2d19dd | 282 | |
0f2d19dd JB |
283 | \f |
284 | ||
0f2d19dd | 285 | static SCM |
1bbd0b84 | 286 | mark_async (SCM obj) |
0f2d19dd JB |
287 | { |
288 | struct scm_async * it; | |
0f2d19dd JB |
289 | it = SCM_ASYNC (obj); |
290 | return it->thunk; | |
291 | } | |
292 | ||
0f2d19dd JB |
293 | \f |
294 | ||
3b3b36dd | 295 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
1bbd0b84 GB |
296 | (SCM thunk), |
297 | "") | |
298 | #define FUNC_NAME s_scm_async | |
0f2d19dd | 299 | { |
273b7b94 | 300 | SCM_RETURN_NEWSMOB2 (scm_tc16_async, 0, thunk); |
0f2d19dd | 301 | } |
1bbd0b84 | 302 | #undef FUNC_NAME |
0f2d19dd | 303 | |
3b3b36dd | 304 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
1bbd0b84 GB |
305 | (SCM thunk), |
306 | "") | |
307 | #define FUNC_NAME s_scm_system_async | |
0f2d19dd JB |
308 | { |
309 | SCM it; | |
310 | SCM list; | |
311 | ||
312 | it = scm_async (thunk); | |
273b7b94 MD |
313 | SCM_NEWCELL (list); |
314 | SCM_SETCAR (list, it); | |
315 | SCM_SETCDR (list, scm_asyncs); | |
0f2d19dd | 316 | scm_asyncs = list; |
0f2d19dd JB |
317 | return it; |
318 | } | |
1bbd0b84 | 319 | #undef FUNC_NAME |
0f2d19dd | 320 | |
3b3b36dd | 321 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 GB |
322 | (SCM a), |
323 | "") | |
324 | #define FUNC_NAME s_scm_async_mark | |
0f2d19dd JB |
325 | { |
326 | struct scm_async * it; | |
3b3b36dd | 327 | SCM_VALIDATE_ASYNC_COPY (1,a,it); |
9f0e55a6 | 328 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd | 329 | it->got_it = 1; |
9f0e55a6 MD |
330 | #else |
331 | scm_asyncs_pending_p = it->got_it = 1; | |
332 | #endif | |
0f2d19dd JB |
333 | return SCM_UNSPECIFIED; |
334 | } | |
1bbd0b84 | 335 | #undef FUNC_NAME |
0f2d19dd JB |
336 | |
337 | ||
3b3b36dd | 338 | SCM_DEFINE (scm_system_async_mark, "system-async-mark", 1, 0, 0, |
1bbd0b84 GB |
339 | (SCM a), |
340 | "") | |
341 | #define FUNC_NAME s_scm_system_async_mark | |
0f2d19dd JB |
342 | { |
343 | struct scm_async * it; | |
3b3b36dd | 344 | SCM_VALIDATE_ASYNC_COPY (1,a,it); |
0f2d19dd | 345 | SCM_REDEFER_INTS; |
9f0e55a6 | 346 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
347 | it->got_it = 1; |
348 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; | |
349 | scm_async_clock = 1; | |
9f0e55a6 MD |
350 | #else |
351 | scm_asyncs_pending_p = it->got_it = 1; | |
352 | #endif | |
0f2d19dd JB |
353 | SCM_REALLOW_INTS; |
354 | return SCM_UNSPECIFIED; | |
355 | } | |
1bbd0b84 | 356 | #undef FUNC_NAME |
0f2d19dd JB |
357 | |
358 | ||
3b3b36dd | 359 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
1bbd0b84 GB |
360 | (SCM list_of_a), |
361 | "") | |
362 | #define FUNC_NAME s_scm_run_asyncs | |
0f2d19dd | 363 | { |
9f0e55a6 | 364 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
365 | if (scm_mask_ints) |
366 | return SCM_BOOL_F; | |
9f0e55a6 MD |
367 | #endif |
368 | scm_asyncs_pending_p = 0; | |
1bbd0b84 | 369 | while (list_of_a != SCM_EOL) |
0f2d19dd JB |
370 | { |
371 | SCM a; | |
372 | struct scm_async * it; | |
9f0e55a6 | 373 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 374 | a = SCM_CAR (list_of_a); |
5d2d2ffc | 375 | SCM_VALIDATE_ASYNC_COPY (SCM_ARG1,a,it); |
0f2d19dd JB |
376 | scm_mask_ints = 1; |
377 | if (it->got_it) | |
378 | { | |
379 | it->got_it = 0; | |
380 | scm_apply (it->thunk, SCM_EOL, SCM_EOL); | |
381 | } | |
382 | scm_mask_ints = 0; | |
1bbd0b84 | 383 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
384 | } |
385 | return SCM_BOOL_T; | |
386 | } | |
1bbd0b84 | 387 | #undef FUNC_NAME |
0f2d19dd JB |
388 | |
389 | \f | |
390 | ||
391 | ||
3b3b36dd | 392 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
1bbd0b84 GB |
393 | (SCM args), |
394 | "") | |
395 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 396 | { |
5d2d2ffc | 397 | return (SCM_NULLP (args) ? SCM_BOOL_F : SCM_CAR (args)); |
0f2d19dd | 398 | } |
1bbd0b84 | 399 | #undef FUNC_NAME |
0f2d19dd JB |
400 | |
401 | ||
402 | \f | |
403 | ||
9f0e55a6 MD |
404 | #ifdef GUILE_OLD_ASYNC_CLICK |
405 | ||
3b3b36dd | 406 | SCM_DEFINE (scm_set_tick_rate, "set-tick-rate", 1, 0, 0, |
1bbd0b84 GB |
407 | (SCM n), |
408 | "") | |
409 | #define FUNC_NAME s_scm_set_tick_rate | |
0f2d19dd | 410 | { |
9b139b4e DH |
411 | unsigned int old_n = scm_tick_rate; |
412 | SCM_VALIDATE_INUM (1, n); | |
413 | scm_desired_tick_rate = SCM_INUM (n); | |
0f2d19dd JB |
414 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
415 | scm_async_clock = 1; | |
416 | return SCM_MAKINUM (old_n); | |
417 | } | |
1bbd0b84 | 418 | #undef FUNC_NAME |
0f2d19dd JB |
419 | |
420 | \f | |
421 | ||
422 | ||
3b3b36dd | 423 | SCM_DEFINE (scm_set_switch_rate, "set-switch-rate", 1, 0, 0, |
1bbd0b84 GB |
424 | (SCM n), |
425 | "") | |
426 | #define FUNC_NAME s_scm_set_switch_rate | |
0f2d19dd | 427 | { |
9b139b4e DH |
428 | unsigned int old_n = scm_switch_rate; |
429 | SCM_VALIDATE_INUM (1, n); | |
430 | scm_desired_switch_rate = SCM_INUM (n); | |
0f2d19dd JB |
431 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
432 | scm_async_clock = 1; | |
433 | return SCM_MAKINUM (old_n); | |
434 | } | |
1bbd0b84 | 435 | #undef FUNC_NAME |
0f2d19dd | 436 | |
9f0e55a6 | 437 | #endif |
0f2d19dd JB |
438 | \f |
439 | ||
9ea54cc6 GH |
440 | /* points to the GC system-async, so that scm_gc_end can find it. */ |
441 | SCM scm_gc_async; | |
1cc91f1b | 442 | |
9ea54cc6 GH |
443 | /* the vcell for gc-thunk. */ |
444 | static SCM scm_gc_vcell; | |
1cc91f1b | 445 | |
9ea54cc6 GH |
446 | /* the thunk installed in the GC system-async, which is marked at the |
447 | end of garbage collection. */ | |
0f2d19dd | 448 | static SCM |
9ea54cc6 | 449 | scm_sys_gc_async_thunk (void) |
0f2d19dd | 450 | { |
9ea54cc6 GH |
451 | if (SCM_NFALSEP (scm_gc_vcell)) |
452 | { | |
453 | SCM proc = SCM_CDR (scm_gc_vcell); | |
1cc91f1b | 454 | |
9ea54cc6 GH |
455 | if (SCM_NFALSEP (proc) && !SCM_UNBNDP (proc)) |
456 | scm_apply (proc, SCM_EOL, SCM_EOL); | |
457 | } | |
458 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
459 | } |
460 | ||
0f2d19dd JB |
461 | \f |
462 | ||
3b3b36dd | 463 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
1bbd0b84 GB |
464 | (), |
465 | "") | |
466 | #define FUNC_NAME s_scm_unmask_signals | |
0f2d19dd JB |
467 | { |
468 | scm_mask_ints = 0; | |
469 | return SCM_UNSPECIFIED; | |
470 | } | |
1bbd0b84 | 471 | #undef FUNC_NAME |
0f2d19dd JB |
472 | |
473 | ||
3b3b36dd | 474 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
1bbd0b84 GB |
475 | (), |
476 | "") | |
477 | #define FUNC_NAME s_scm_mask_signals | |
0f2d19dd JB |
478 | { |
479 | scm_mask_ints = 1; | |
480 | return SCM_UNSPECIFIED; | |
481 | } | |
1bbd0b84 | 482 | #undef FUNC_NAME |
0f2d19dd JB |
483 | |
484 | \f | |
485 | ||
0f2d19dd JB |
486 | void |
487 | scm_init_async () | |
0f2d19dd JB |
488 | { |
489 | SCM a_thunk; | |
273b7b94 | 490 | scm_tc16_async = scm_make_smob_type_mfpe ("async", 0, |
23a62151 | 491 | mark_async, NULL, NULL, NULL); |
9ea54cc6 | 492 | scm_gc_vcell = scm_sysintern ("gc-thunk", SCM_BOOL_F); |
0f2d19dd | 493 | a_thunk = scm_make_gsubr ("%gc-thunk", 0, 0, 0, scm_sys_gc_async_thunk); |
9ea54cc6 | 494 | scm_gc_async = scm_system_async (a_thunk); |
0f2d19dd | 495 | |
0f2d19dd JB |
496 | #include "async.x" |
497 | } | |
89e00824 ML |
498 | |
499 | /* | |
500 | Local Variables: | |
501 | c-file-style: "gnu" | |
502 | End: | |
503 | */ |