Commit | Line | Data |
---|---|---|
273b7b94 | 1 | /* Copyright (C) 1995, 96, 97, 98, 2000 Free Software Foundation, Inc. |
843e4e9d | 2 | * |
0f2d19dd JB |
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. | |
843e4e9d | 7 | * |
0f2d19dd JB |
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. | |
843e4e9d | 12 | * |
0f2d19dd JB |
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> | |
a0599745 MD |
49 | #include "libguile/_scm.h" |
50 | #include "libguile/eval.h" | |
51 | #include "libguile/throw.h" | |
52 | #include "libguile/root.h" | |
53 | #include "libguile/smob.h" | |
20e6290e | 54 | |
a0599745 MD |
55 | #include "libguile/validate.h" |
56 | #include "libguile/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. | |
843e4e9d | 74 | * |
0f2d19dd JB |
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 | |
e841c3e0 | 113 | static scm_bits_t tc16_async; |
e94e3f21 ML |
114 | |
115 | \f | |
116 | ||
117 | /* cmm: this has SCM_ prefix because SCM_MAKE_VALIDATE expects it. | |
118 | this is ugly. */ | |
e841c3e0 KN |
119 | #define SCM_ASYNCP(X) SCM_TYP16_PREDICATE (tc16_async, X) |
120 | #define VALIDATE_ASYNC(pos,a) SCM_MAKE_VALIDATE(pos, a, ASYNCP) | |
e94e3f21 ML |
121 | |
122 | #define ASYNC_GOT_IT(X) (SCM_CELL_WORD_0 (X) >> 16) | |
d1ca2c64 | 123 | #define SET_ASYNC_GOT_IT(X, V) (SCM_SET_CELL_WORD_0 ((X), SCM_TYP16 (X) | ((V) << 16))) |
e94e3f21 | 124 | #define ASYNC_THUNK(X) SCM_CELL_OBJECT_1 (X) |
0f2d19dd | 125 | |
0f2d19dd JB |
126 | \f |
127 | ||
9f0e55a6 | 128 | #ifdef GUILE_OLD_ASYNC_CLICK |
5e569ca8 MD |
129 | int |
130 | scm_asyncs_pending () | |
0f2d19dd JB |
131 | { |
132 | SCM pos; | |
133 | pos = scm_asyncs; | |
134 | while (pos != SCM_EOL) | |
135 | { | |
843e4e9d | 136 | SCM a = SCM_CAR (pos); |
e94e3f21 | 137 | if (ASYNC_GOT_IT (a)) |
0f2d19dd JB |
138 | return 1; |
139 | pos = SCM_CDR (pos); | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
1cc91f1b | 144 | |
0f2d19dd JB |
145 | void |
146 | scm_async_click () | |
0f2d19dd JB |
147 | { |
148 | int owe_switch; | |
149 | int owe_tick; | |
150 | ||
151 | if (!scm_switch_rate) | |
152 | { | |
153 | owe_switch = 0; | |
154 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
155 | scm_desired_switch_rate = 0; | |
156 | } | |
157 | else | |
158 | { | |
159 | owe_switch = (scm_async_rate >= scm_switch_clock); | |
160 | if (owe_switch) | |
161 | { | |
162 | if (scm_desired_switch_rate) | |
163 | { | |
164 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
165 | scm_desired_switch_rate = 0; | |
166 | } | |
167 | else | |
168 | scm_switch_clock = scm_switch_rate; | |
169 | } | |
170 | else | |
171 | { | |
172 | if (scm_desired_switch_rate) | |
173 | { | |
174 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
175 | scm_desired_switch_rate = 0; | |
176 | } | |
177 | else | |
178 | scm_switch_clock -= scm_async_rate; | |
179 | } | |
180 | } | |
181 | ||
182 | if (scm_mask_ints) | |
183 | { | |
184 | if (owe_switch) | |
185 | scm_switch (); | |
186 | scm_async_clock = 1; | |
187 | return;; | |
188 | } | |
843e4e9d | 189 | |
0f2d19dd JB |
190 | if (!scm_tick_rate) |
191 | { | |
192 | unsigned int r; | |
193 | owe_tick = 0; | |
194 | r = scm_desired_tick_rate; | |
195 | if (r) | |
196 | { | |
197 | scm_desired_tick_rate = 0; | |
198 | scm_tick_rate = r; | |
199 | scm_tick_clock = r; | |
200 | } | |
201 | } | |
202 | else | |
203 | { | |
204 | owe_tick = (scm_async_rate >= scm_tick_clock); | |
205 | if (owe_tick) | |
206 | { | |
207 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
208 | scm_desired_tick_rate = 0; | |
209 | } | |
210 | else | |
211 | { | |
212 | if (scm_desired_tick_rate) | |
213 | { | |
214 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
215 | scm_desired_tick_rate = 0; | |
216 | } | |
217 | else | |
218 | scm_tick_clock -= scm_async_rate; | |
219 | } | |
220 | } | |
221 | ||
0f2d19dd JB |
222 | SCM_DEFER_INTS; |
223 | if (scm_tick_rate && scm_switch_rate) | |
224 | { | |
225 | scm_async_rate = min (scm_tick_clock, scm_switch_clock); | |
226 | scm_async_clock = scm_async_rate; | |
227 | } | |
228 | else if (scm_tick_rate) | |
229 | { | |
230 | scm_async_clock = scm_async_rate = scm_tick_clock; | |
231 | } | |
232 | else if (scm_switch_rate) | |
233 | { | |
234 | scm_async_clock = scm_async_rate = scm_switch_clock; | |
235 | } | |
236 | else | |
237 | scm_async_clock = scm_async_rate = 1 << 16; | |
238 | SCM_ALLOW_INTS_ONLY; | |
239 | ||
240 | tail: | |
241 | scm_run_asyncs (scm_asyncs); | |
242 | ||
243 | SCM_DEFER_INTS; | |
5e569ca8 | 244 | if (scm_asyncs_pending ()) |
0f2d19dd JB |
245 | { |
246 | SCM_ALLOW_INTS_ONLY; | |
247 | goto tail; | |
248 | } | |
249 | SCM_ALLOW_INTS; | |
250 | ||
251 | if (owe_switch) | |
252 | scm_switch (); | |
253 | } | |
254 | ||
8d924bfe MD |
255 | void |
256 | scm_switch () | |
257 | { | |
258 | #if 0 /* Thread switching code should probably reside here, but the | |
259 | async switching code doesn't seem to work, so it's put in the | |
260 | SCM_DEFER_INTS macro instead. /mdj */ | |
261 | SCM_THREAD_SWITCHING_CODE; | |
262 | #endif | |
263 | } | |
264 | ||
9f0e55a6 MD |
265 | #else |
266 | ||
267 | void | |
268 | scm_async_click () | |
269 | { | |
270 | if (!scm_mask_ints) | |
271 | do | |
272 | scm_run_asyncs (scm_asyncs); | |
273 | while (scm_asyncs_pending_p); | |
274 | } | |
0f2d19dd | 275 | |
9f0e55a6 | 276 | #endif |
0f2d19dd | 277 | |
8d924bfe | 278 | |
0f2d19dd JB |
279 | \f |
280 | ||
0f2d19dd | 281 | static SCM |
e841c3e0 | 282 | async_mark (SCM obj) |
0f2d19dd | 283 | { |
e94e3f21 | 284 | return ASYNC_THUNK (obj); |
0f2d19dd JB |
285 | } |
286 | ||
0f2d19dd JB |
287 | \f |
288 | ||
843e4e9d | 289 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
1bbd0b84 GB |
290 | (SCM thunk), |
291 | "") | |
292 | #define FUNC_NAME s_scm_async | |
0f2d19dd | 293 | { |
e94e3f21 | 294 | SCM_RETURN_NEWSMOB (tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 295 | } |
1bbd0b84 | 296 | #undef FUNC_NAME |
0f2d19dd | 297 | |
843e4e9d | 298 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
1bbd0b84 GB |
299 | (SCM thunk), |
300 | "") | |
301 | #define FUNC_NAME s_scm_system_async | |
0f2d19dd JB |
302 | { |
303 | SCM it; | |
304 | SCM list; | |
305 | ||
306 | it = scm_async (thunk); | |
273b7b94 MD |
307 | SCM_NEWCELL (list); |
308 | SCM_SETCAR (list, it); | |
309 | SCM_SETCDR (list, scm_asyncs); | |
0f2d19dd | 310 | scm_asyncs = list; |
0f2d19dd JB |
311 | return it; |
312 | } | |
1bbd0b84 | 313 | #undef FUNC_NAME |
0f2d19dd | 314 | |
843e4e9d | 315 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 GB |
316 | (SCM a), |
317 | "") | |
318 | #define FUNC_NAME s_scm_async_mark | |
0f2d19dd | 319 | { |
e94e3f21 | 320 | VALIDATE_ASYNC (1, a); |
9f0e55a6 | 321 | #ifdef GUILE_OLD_ASYNC_CLICK |
e94e3f21 | 322 | SET_ASYNC_GOT_IT (a, 1); |
9f0e55a6 | 323 | #else |
e94e3f21 | 324 | SET_ASYNC_GOT_IT (a, scm_asyncs_pending_p = 1); |
9f0e55a6 | 325 | #endif |
0f2d19dd JB |
326 | return SCM_UNSPECIFIED; |
327 | } | |
1bbd0b84 | 328 | #undef FUNC_NAME |
0f2d19dd JB |
329 | |
330 | ||
843e4e9d | 331 | SCM_DEFINE (scm_system_async_mark, "system-async-mark", 1, 0, 0, |
1bbd0b84 GB |
332 | (SCM a), |
333 | "") | |
334 | #define FUNC_NAME s_scm_system_async_mark | |
0f2d19dd | 335 | { |
e94e3f21 | 336 | VALIDATE_ASYNC (1, a); |
0f2d19dd | 337 | SCM_REDEFER_INTS; |
9f0e55a6 | 338 | #ifdef GUILE_OLD_ASYNC_CLICK |
e94e3f21 | 339 | SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
340 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
341 | scm_async_clock = 1; | |
9f0e55a6 | 342 | #else |
e94e3f21 | 343 | SET_ASYNC_GOT_IT (a, scm_asyncs_pending_p = 1); |
9f0e55a6 | 344 | #endif |
0f2d19dd JB |
345 | SCM_REALLOW_INTS; |
346 | return SCM_UNSPECIFIED; | |
347 | } | |
1bbd0b84 | 348 | #undef FUNC_NAME |
0f2d19dd JB |
349 | |
350 | ||
843e4e9d | 351 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
1bbd0b84 GB |
352 | (SCM list_of_a), |
353 | "") | |
354 | #define FUNC_NAME s_scm_run_asyncs | |
0f2d19dd | 355 | { |
9f0e55a6 | 356 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
357 | if (scm_mask_ints) |
358 | return SCM_BOOL_F; | |
6587a966 | 359 | #else |
9f0e55a6 | 360 | scm_asyncs_pending_p = 0; |
6587a966 | 361 | #endif |
843524cc | 362 | while (! SCM_NULLP (list_of_a)) |
0f2d19dd JB |
363 | { |
364 | SCM a; | |
9f0e55a6 | 365 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 366 | a = SCM_CAR (list_of_a); |
e94e3f21 | 367 | VALIDATE_ASYNC (SCM_ARG1, a); |
0f2d19dd | 368 | scm_mask_ints = 1; |
e94e3f21 | 369 | if (ASYNC_GOT_IT (a)) |
0f2d19dd | 370 | { |
e94e3f21 ML |
371 | SET_ASYNC_GOT_IT (a, 0); |
372 | scm_apply (ASYNC_THUNK (a), SCM_EOL, SCM_EOL); | |
0f2d19dd JB |
373 | } |
374 | scm_mask_ints = 0; | |
1bbd0b84 | 375 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
376 | } |
377 | return SCM_BOOL_T; | |
378 | } | |
1bbd0b84 | 379 | #undef FUNC_NAME |
0f2d19dd JB |
380 | |
381 | \f | |
382 | ||
383 | ||
843e4e9d | 384 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
1bbd0b84 GB |
385 | (SCM args), |
386 | "") | |
387 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 388 | { |
af45e3b0 | 389 | SCM_VALIDATE_REST_ARGUMENT (args); |
5d2d2ffc | 390 | return (SCM_NULLP (args) ? SCM_BOOL_F : SCM_CAR (args)); |
0f2d19dd | 391 | } |
1bbd0b84 | 392 | #undef FUNC_NAME |
0f2d19dd JB |
393 | |
394 | ||
395 | \f | |
396 | ||
9f0e55a6 MD |
397 | #ifdef GUILE_OLD_ASYNC_CLICK |
398 | ||
843e4e9d | 399 | SCM_DEFINE (scm_set_tick_rate, "set-tick-rate", 1, 0, 0, |
1bbd0b84 GB |
400 | (SCM n), |
401 | "") | |
402 | #define FUNC_NAME s_scm_set_tick_rate | |
0f2d19dd | 403 | { |
9b139b4e DH |
404 | unsigned int old_n = scm_tick_rate; |
405 | SCM_VALIDATE_INUM (1, n); | |
406 | scm_desired_tick_rate = SCM_INUM (n); | |
0f2d19dd JB |
407 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
408 | scm_async_clock = 1; | |
409 | return SCM_MAKINUM (old_n); | |
410 | } | |
1bbd0b84 | 411 | #undef FUNC_NAME |
0f2d19dd JB |
412 | |
413 | \f | |
414 | ||
415 | ||
843e4e9d | 416 | SCM_DEFINE (scm_set_switch_rate, "set-switch-rate", 1, 0, 0, |
1bbd0b84 GB |
417 | (SCM n), |
418 | "") | |
419 | #define FUNC_NAME s_scm_set_switch_rate | |
0f2d19dd | 420 | { |
9b139b4e DH |
421 | unsigned int old_n = scm_switch_rate; |
422 | SCM_VALIDATE_INUM (1, n); | |
423 | scm_desired_switch_rate = SCM_INUM (n); | |
0f2d19dd JB |
424 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
425 | scm_async_clock = 1; | |
426 | return SCM_MAKINUM (old_n); | |
427 | } | |
1bbd0b84 | 428 | #undef FUNC_NAME |
0f2d19dd | 429 | |
9f0e55a6 | 430 | #endif |
0f2d19dd | 431 | |
0f2d19dd JB |
432 | \f |
433 | ||
843e4e9d | 434 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
1bbd0b84 GB |
435 | (), |
436 | "") | |
437 | #define FUNC_NAME s_scm_unmask_signals | |
0f2d19dd JB |
438 | { |
439 | scm_mask_ints = 0; | |
440 | return SCM_UNSPECIFIED; | |
441 | } | |
1bbd0b84 | 442 | #undef FUNC_NAME |
0f2d19dd JB |
443 | |
444 | ||
843e4e9d | 445 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
1bbd0b84 GB |
446 | (), |
447 | "") | |
448 | #define FUNC_NAME s_scm_mask_signals | |
0f2d19dd JB |
449 | { |
450 | scm_mask_ints = 1; | |
451 | return SCM_UNSPECIFIED; | |
452 | } | |
1bbd0b84 | 453 | #undef FUNC_NAME |
0f2d19dd JB |
454 | |
455 | \f | |
456 | ||
0f2d19dd JB |
457 | void |
458 | scm_init_async () | |
0f2d19dd | 459 | { |
939794ce | 460 | scm_asyncs = SCM_EOL; |
73ea78af | 461 | tc16_async = scm_make_smob_type ("async", 0); |
e841c3e0 | 462 | scm_set_smob_mark (tc16_async, async_mark); |
73ea78af | 463 | |
8dc9439f | 464 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 465 | #include "libguile/async.x" |
8dc9439f | 466 | #endif |
0f2d19dd | 467 | } |
89e00824 ML |
468 | |
469 | /* | |
470 | Local Variables: | |
471 | c-file-style: "gnu" | |
472 | End: | |
473 | */ |