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d90ca38d | 1 | /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
7bfd3b9e 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 | |
7bfd3b9e 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. */ |
7bfd3b9e JB |
41 | \f |
42 | ||
51d394a1 | 43 | /* $Id: coop.c,v 1.7 1998-03-30 21:02:31 mdj Exp $ */ |
7bfd3b9e JB |
44 | |
45 | /* Cooperative thread library, based on QuickThreads */ | |
46 | ||
47 | #include <qt.h> | |
51d394a1 | 48 | #include "eval.h" |
7bfd3b9e | 49 | |
51d394a1 MD |
50 | /* #define COOP_STKSIZE (0x10000) */ |
51 | #define COOP_STKSIZE (SCM_EVAL_STACK) | |
7bfd3b9e JB |
52 | |
53 | /* `alignment' must be a power of 2. */ | |
54 | #define COOP_STKALIGN(sp, alignment) \ | |
55 | ((void *)((((qt_word_t)(sp)) + (alignment) - 1) & ~((alignment)-1))) | |
56 | ||
57 | \f | |
58 | ||
59 | /* Queue access functions. */ | |
60 | ||
61 | #ifdef __STDC__ | |
62 | static void | |
63 | coop_qinit (coop_q_t *q) | |
64 | #else | |
65 | static void | |
66 | coop_qinit (q) | |
67 | coop_q_t *q; | |
68 | #endif | |
69 | { | |
70 | q->t.next = q->tail = &q->t; | |
71 | ||
72 | q->t.all_prev = NULL; | |
73 | q->t.all_next = NULL; | |
44e8413c MD |
74 | #ifdef GUILE_ISELECT |
75 | q->t.nfds = 0; | |
76 | q->t.readfds = NULL; | |
77 | q->t.writefds = NULL; | |
78 | q->t.exceptfds = NULL; | |
79 | q->t.timeoutp = 0; | |
80 | #endif | |
7bfd3b9e JB |
81 | } |
82 | ||
83 | ||
84 | #ifdef __STDC__ | |
44e8413c | 85 | coop_t * |
7bfd3b9e JB |
86 | coop_qget (coop_q_t *q) |
87 | #else | |
44e8413c | 88 | coop_t * |
7bfd3b9e JB |
89 | coop_qget (q) |
90 | coop_q_t *q; | |
91 | #endif | |
92 | { | |
93 | coop_t *t; | |
94 | ||
95 | t = q->t.next; | |
96 | q->t.next = t->next; | |
97 | if (t->next == &q->t) { | |
98 | if (t == &q->t) { /* If it was already empty .. */ | |
99 | return (NULL); /* .. say so. */ | |
100 | } | |
101 | q->tail = &q->t; /* Else now it is empty. */ | |
102 | } | |
103 | return (t); | |
104 | } | |
105 | ||
106 | ||
107 | #ifdef __STDC__ | |
44e8413c | 108 | void |
7bfd3b9e JB |
109 | coop_qput (coop_q_t *q, coop_t *t) |
110 | #else | |
44e8413c | 111 | void |
7bfd3b9e JB |
112 | coop_qput (q, t) |
113 | coop_q_t *q; | |
114 | coop_t *t; | |
115 | #endif | |
116 | { | |
117 | q->tail->next = t; | |
118 | t->next = &q->t; | |
119 | q->tail = t; | |
120 | } | |
121 | ||
122 | #ifdef __STDC__ | |
123 | static void | |
124 | coop_all_qput (coop_q_t *q, coop_t *t) | |
125 | #else | |
126 | static void | |
127 | coop_all_qput (q, t) | |
128 | coop_q_t *q; | |
129 | coop_t *t; | |
130 | #endif | |
131 | { | |
132 | if (q->t.all_next) | |
133 | q->t.all_next->all_prev = t; | |
134 | t->all_prev = NULL; | |
135 | t->all_next = q->t.all_next; | |
136 | q->t.all_next = t; | |
137 | } | |
138 | ||
139 | #ifdef __STDC__ | |
140 | static void | |
141 | coop_all_qremove (coop_q_t *q, coop_t *t) | |
142 | #else | |
143 | static void | |
144 | coop_all_qremove (q, t) | |
145 | coop_q_t *q; | |
146 | coop_t *t; | |
147 | #endif | |
148 | { | |
149 | if (t->all_prev) | |
150 | t->all_prev->all_next = t->all_next; | |
151 | else | |
152 | q->t.all_next = t->all_next; | |
153 | if (t->all_next) | |
154 | t->all_next->all_prev = t->all_prev; | |
155 | } | |
156 | ||
157 | ||
158 | \f/* Thread routines. */ | |
159 | ||
44e8413c MD |
160 | coop_q_t coop_global_runq; /* A queue of runable threads. */ |
161 | coop_q_t coop_global_sleepq; /* A queue of sleeping threads. */ | |
162 | coop_q_t coop_tmp_queue; /* A temp working queue */ | |
163 | coop_q_t coop_global_allq; /* A queue of all threads. */ | |
164 | static coop_t coop_global_main; /* Thread for the process. */ | |
165 | coop_t *coop_global_curr; /* Currently-executing thread. */ | |
7bfd3b9e JB |
166 | |
167 | static void *coop_starthelp (qt_t *old, void *ignore0, void *ignore1); | |
168 | static void coop_only (void *pu, void *pt, qt_userf_t *f); | |
169 | static void *coop_aborthelp (qt_t *sp, void *old, void *null); | |
170 | static void *coop_yieldhelp (qt_t *sp, void *old, void *blockq); | |
171 | ||
172 | ||
173 | #ifdef __STDC__ | |
174 | void | |
175 | coop_init() | |
176 | #else | |
177 | void | |
178 | coop_init() | |
179 | #endif | |
180 | { | |
181 | coop_qinit (&coop_global_runq); | |
182 | coop_qinit (&coop_global_sleepq); | |
44e8413c | 183 | coop_qinit (&coop_tmp_queue); |
7bfd3b9e JB |
184 | coop_qinit (&coop_global_allq); |
185 | coop_global_curr = &coop_global_main; | |
186 | } | |
187 | ||
188 | ||
189 | /* Return the next runnable thread. If no threads are currently runnable, | |
190 | and there are sleeping threads - wait until one wakes up. Otherwise, | |
191 | return NULL. */ | |
192 | ||
44e8413c MD |
193 | #ifdef GUILE_ISELECT |
194 | extern coop_t *coop_next_runnable_thread (); | |
195 | #else | |
7bfd3b9e JB |
196 | #ifdef __STDC__ |
197 | coop_t * | |
198 | coop_next_runnable_thread() | |
199 | #else | |
200 | coop_t * | |
201 | coop_next_runnable_thread() | |
202 | #endif | |
203 | { | |
204 | int sleepers; | |
205 | coop_t *t; | |
206 | time_t now; | |
207 | ||
208 | do { | |
209 | sleepers = 0; | |
210 | now = time(NULL); | |
211 | ||
212 | /* Check the sleeping queue */ | |
213 | while ((t = coop_qget(&coop_global_sleepq)) != NULL) | |
214 | { | |
215 | sleepers++; | |
216 | if (t->wakeup_time <= now) | |
217 | coop_qput(&coop_global_runq, t); | |
218 | else | |
44e8413c | 219 | coop_qput(&coop_tmp_queue, t); |
7bfd3b9e | 220 | } |
44e8413c | 221 | while ((t = coop_qget(&coop_tmp_queue)) != NULL) |
7bfd3b9e JB |
222 | coop_qput(&coop_global_sleepq, t); |
223 | ||
224 | t = coop_qget (&coop_global_runq); | |
225 | ||
226 | } while ((t == NULL) && (sleepers > 0)); | |
227 | ||
228 | return t; | |
229 | } | |
44e8413c | 230 | #endif |
7bfd3b9e JB |
231 | |
232 | #ifdef __STDC__ | |
233 | void | |
234 | coop_start() | |
235 | #else | |
236 | void | |
237 | coop_start() | |
238 | #endif | |
239 | { | |
240 | coop_t *next; | |
241 | ||
242 | while ((next = coop_qget (&coop_global_runq)) != NULL) { | |
243 | coop_global_curr = next; | |
244 | QT_BLOCK (coop_starthelp, 0, 0, next->sp); | |
245 | } | |
246 | } | |
247 | ||
248 | ||
249 | #ifdef __STDC__ | |
250 | static void * | |
251 | coop_starthelp (qt_t *old, void *ignore0, void *ignore1) | |
252 | #else | |
253 | static void * | |
254 | coop_starthelp (old, ignore0, ignore1) | |
255 | qt_t *old; | |
256 | void *ignore0; | |
257 | void *ignore1; | |
258 | #endif | |
259 | { | |
260 | coop_global_main.sp = old; | |
261 | coop_global_main.joining = NULL; | |
262 | coop_qput (&coop_global_runq, &coop_global_main); | |
263 | return NULL; /* not used, but keeps compiler happy */ | |
264 | } | |
265 | ||
266 | #ifdef __STDC__ | |
c8bf4ecd | 267 | int |
7bfd3b9e JB |
268 | coop_mutex_init (coop_m *m) |
269 | #else | |
c8bf4ecd | 270 | int |
7bfd3b9e JB |
271 | coop_mutex_init (m) |
272 | coop_m *m; | |
273 | #endif | |
274 | { | |
275 | m->owner = NULL; | |
276 | coop_qinit(&(m->waiting)); | |
c8bf4ecd | 277 | return 0; |
7bfd3b9e JB |
278 | } |
279 | ||
280 | #ifdef __STDC__ | |
c8bf4ecd | 281 | int |
7bfd3b9e JB |
282 | coop_mutex_lock (coop_m *m) |
283 | #else | |
c8bf4ecd | 284 | int |
7bfd3b9e JB |
285 | coop_mutex_lock () |
286 | coop_m *m; | |
287 | #endif | |
288 | { | |
289 | if (m->owner == NULL) | |
290 | { | |
291 | m->owner = coop_global_curr; | |
292 | } | |
293 | else | |
294 | { | |
295 | coop_t *old, *newthread; | |
296 | ||
297 | /* Record the current top-of-stack before going to sleep */ | |
298 | coop_global_curr->top = &old; | |
299 | ||
44e8413c MD |
300 | #ifdef GUILE_ISELECT |
301 | newthread = coop_wait_for_runnable_thread(); | |
d186aac6 MD |
302 | if (newthread == coop_global_curr) |
303 | coop_abort (); | |
44e8413c | 304 | #else |
7bfd3b9e | 305 | newthread = coop_next_runnable_thread(); |
44e8413c | 306 | #endif |
7bfd3b9e JB |
307 | old = coop_global_curr; |
308 | coop_global_curr = newthread; | |
309 | QT_BLOCK (coop_yieldhelp, old, &(m->waiting), newthread->sp); | |
310 | } | |
c8bf4ecd | 311 | return 0; |
7bfd3b9e JB |
312 | } |
313 | ||
314 | ||
315 | #ifdef __STDC__ | |
c8bf4ecd | 316 | int |
7bfd3b9e JB |
317 | coop_mutex_unlock (coop_m *m) |
318 | #else | |
c8bf4ecd | 319 | int |
7bfd3b9e JB |
320 | coop_mutex_unlock (m) |
321 | coop_m *m; | |
322 | #endif | |
323 | { | |
324 | coop_t *old, *newthread; | |
325 | ||
326 | newthread = coop_qget (&(m->waiting)); | |
327 | if (newthread != NULL) | |
328 | { | |
329 | /* Record the current top-of-stack before going to sleep */ | |
330 | coop_global_curr->top = &old; | |
331 | ||
332 | old = coop_global_curr; | |
333 | coop_global_curr = newthread; | |
334 | m->owner = coop_global_curr; | |
335 | QT_BLOCK (coop_yieldhelp, old, &coop_global_runq, newthread->sp); | |
336 | } | |
337 | else | |
338 | { | |
339 | m->owner = NULL; | |
340 | } | |
c8bf4ecd | 341 | return 0; |
7bfd3b9e JB |
342 | } |
343 | ||
344 | ||
345 | #ifdef __STDC__ | |
c8bf4ecd MD |
346 | int |
347 | coop_mutex_destroy (coop_m *m) | |
348 | #else | |
349 | int | |
350 | coop_mutex_destroy (m) | |
351 | coop_m *m; | |
352 | #endif | |
353 | { | |
354 | return 0; | |
355 | } | |
356 | ||
357 | ||
358 | #ifdef __STDC__ | |
359 | int | |
7bfd3b9e JB |
360 | coop_condition_variable_init (coop_c *c) |
361 | #else | |
c8bf4ecd | 362 | int |
7bfd3b9e JB |
363 | coop_condition_variable_init (c) |
364 | coop_c *c; | |
365 | #endif | |
366 | { | |
367 | coop_qinit(&(c->waiting)); | |
c8bf4ecd | 368 | return 0; |
7bfd3b9e JB |
369 | } |
370 | ||
371 | #ifdef __STDC__ | |
c8bf4ecd | 372 | int |
7bfd3b9e JB |
373 | coop_condition_variable_wait (coop_c *c) |
374 | #else | |
c8bf4ecd | 375 | int |
7bfd3b9e JB |
376 | coop_condition_variable_wait (c) |
377 | coop_c *c; | |
378 | #endif | |
379 | { | |
380 | coop_t *old, *newthread; | |
381 | ||
44e8413c MD |
382 | #ifdef GUILE_ISELECT |
383 | newthread = coop_wait_for_runnable_thread(); | |
d186aac6 MD |
384 | if (newthread == coop_global_curr) |
385 | coop_abort (); | |
44e8413c | 386 | #else |
7bfd3b9e | 387 | newthread = coop_next_runnable_thread(); |
44e8413c | 388 | #endif |
7bfd3b9e JB |
389 | old = coop_global_curr; |
390 | coop_global_curr = newthread; | |
391 | QT_BLOCK (coop_yieldhelp, old, &(c->waiting), newthread->sp); | |
c8bf4ecd MD |
392 | return 0; |
393 | } | |
394 | ||
395 | ||
396 | #ifdef __STDC__ | |
397 | int | |
398 | coop_condition_variable_wait_mutex (coop_c *c, coop_m *m) | |
399 | #else | |
400 | int | |
401 | coop_condition_variable_wait_mutex (c, m) | |
402 | coop_c *c; | |
403 | coop_m *m; | |
404 | #endif | |
405 | { | |
406 | coop_mutex_unlock (m); | |
407 | coop_condition_variable_wait (c); | |
408 | coop_mutex_lock (m); | |
409 | return 0; | |
7bfd3b9e JB |
410 | } |
411 | ||
c8bf4ecd | 412 | |
7bfd3b9e | 413 | #ifdef __STDC__ |
c8bf4ecd | 414 | int |
7bfd3b9e JB |
415 | coop_condition_variable_signal (coop_c *c) |
416 | #else | |
c8bf4ecd | 417 | int |
7bfd3b9e JB |
418 | coop_condition_variable_signal (c) |
419 | coop_c *c; | |
420 | #endif | |
421 | { | |
422 | coop_t *newthread; | |
423 | ||
424 | while ((newthread = coop_qget (&(c->waiting))) != NULL) | |
425 | { | |
426 | coop_qput (&coop_global_runq, newthread); | |
427 | } | |
c8bf4ecd MD |
428 | return 0; |
429 | } | |
430 | ||
431 | ||
432 | #ifdef __STDC__ | |
433 | int | |
434 | coop_condition_variable_destroy (coop_c *c) | |
435 | #else | |
436 | int | |
437 | coop_condition_variable_destroy (c) | |
438 | coop_c *c; | |
439 | #endif | |
440 | { | |
441 | return 0; | |
7bfd3b9e JB |
442 | } |
443 | ||
444 | ||
445 | #ifdef __STDC__ | |
446 | coop_t * | |
447 | coop_create (coop_userf_t *f, void *pu) | |
448 | #else | |
449 | coop_t * | |
450 | coop_create (f, pu) | |
451 | coop_userf_t *f; | |
452 | void *pu; | |
453 | #endif | |
454 | { | |
455 | coop_t *t; | |
456 | void *sto; | |
457 | ||
458 | t = malloc (sizeof(coop_t)); | |
459 | ||
460 | t->data = NULL; | |
461 | t->sto = malloc (COOP_STKSIZE); | |
462 | sto = COOP_STKALIGN (t->sto, QT_STKALIGN); | |
463 | t->sp = QT_SP (sto, COOP_STKSIZE - QT_STKALIGN); | |
464 | t->base = t->sp; | |
465 | t->sp = QT_ARGS (t->sp, pu, t, (qt_userf_t *)f, coop_only); | |
466 | t->joining = NULL; | |
467 | coop_qput (&coop_global_runq, t); | |
468 | coop_all_qput (&coop_global_allq, t); | |
469 | ||
470 | return t; | |
471 | } | |
472 | ||
473 | ||
474 | #ifdef __STDC__ | |
475 | static void | |
476 | coop_only (void *pu, void *pt, qt_userf_t *f) | |
477 | #else | |
478 | static void | |
479 | coop_only (pu. pt, f) | |
480 | void *pu, | |
481 | void *pt, | |
482 | qt_userf_t *f; | |
483 | #endif | |
484 | { | |
485 | coop_global_curr = (coop_t *)pt; | |
486 | (*(coop_userf_t *)f)(pu); | |
487 | coop_abort(); | |
488 | /* NOTREACHED */ | |
489 | } | |
490 | ||
491 | ||
492 | #ifdef __STDC__ | |
493 | void | |
494 | coop_abort () | |
495 | #else | |
496 | void | |
497 | coop_abort () | |
498 | #endif | |
499 | { | |
500 | coop_t *old, *newthread; | |
501 | ||
502 | /* Wake up any threads that are waiting to join this one */ | |
503 | if (coop_global_curr->joining) | |
504 | { | |
505 | while ((newthread = coop_qget ((coop_q_t *)(coop_global_curr->joining))) | |
506 | != NULL) | |
507 | { | |
508 | coop_qput (&coop_global_runq, newthread); | |
509 | } | |
510 | free(coop_global_curr->joining); | |
511 | } | |
512 | ||
44e8413c | 513 | #ifdef GUILE_ISELECT |
d186aac6 MD |
514 | scm_I_am_dead = 1; |
515 | do { | |
516 | newthread = coop_wait_for_runnable_thread(); | |
517 | } while (newthread == coop_global_curr); | |
518 | scm_I_am_dead = 0; | |
44e8413c | 519 | #else |
7bfd3b9e | 520 | newthread = coop_next_runnable_thread(); |
44e8413c | 521 | #endif |
7bfd3b9e JB |
522 | coop_all_qremove(&coop_global_allq, coop_global_curr); |
523 | old = coop_global_curr; | |
524 | coop_global_curr = newthread; | |
525 | QT_ABORT (coop_aborthelp, old, (void *)NULL, newthread->sp); | |
526 | } | |
527 | ||
528 | ||
529 | #ifdef __STDC__ | |
530 | static void * | |
531 | coop_aborthelp (qt_t *sp, void *old, void *null) | |
532 | #else | |
533 | static void * | |
534 | coop_aborthelp (sp, old, null) | |
535 | qt_t *sp; | |
536 | void *old; | |
537 | void *null; | |
538 | #endif | |
539 | { | |
540 | coop_t *oldthread = (coop_t *) old; | |
541 | ||
542 | free (oldthread->sto); | |
543 | ||
544 | /* "old" is freed in scm_threads_thread_die(). | |
545 | Marking old->base NULL indicates that this thread is dead */ | |
546 | ||
547 | oldthread->base = NULL; | |
548 | ||
549 | return NULL; | |
550 | } | |
551 | ||
552 | ||
553 | #ifdef __STDC__ | |
554 | void | |
555 | coop_join(coop_t *t) | |
556 | #else | |
557 | void | |
558 | coop_join() | |
559 | coop_t *t; | |
560 | #endif | |
561 | { | |
562 | coop_t *old, *newthread; | |
563 | ||
564 | /* Check if t is already finished */ | |
565 | if (t->base == NULL) | |
566 | return; | |
567 | ||
568 | /* Create a join list if necessary */ | |
569 | if (t->joining == NULL) | |
570 | { | |
571 | t->joining = malloc(sizeof(coop_q_t)); | |
572 | coop_qinit((coop_q_t *) t->joining); | |
573 | } | |
574 | ||
44e8413c MD |
575 | #ifdef GUILE_ISELECT |
576 | newthread = coop_wait_for_runnable_thread(); | |
d186aac6 MD |
577 | if (newthread == coop_global_curr) |
578 | return; | |
44e8413c | 579 | #else |
7bfd3b9e | 580 | newthread = coop_next_runnable_thread(); |
44e8413c | 581 | #endif |
7bfd3b9e JB |
582 | old = coop_global_curr; |
583 | coop_global_curr = newthread; | |
584 | QT_BLOCK (coop_yieldhelp, old, (coop_q_t *) t->joining, newthread->sp); | |
585 | } | |
586 | ||
587 | #ifdef __STDC__ | |
588 | void | |
589 | coop_yield() | |
590 | #else | |
591 | void | |
592 | coop_yield() | |
593 | #endif | |
594 | { | |
595 | coop_t *old = NULL; | |
596 | coop_t *newthread; | |
597 | ||
598 | newthread = coop_next_runnable_thread(); | |
599 | ||
600 | /* There may be no other runnable threads. Return if this is the | |
601 | case. */ | |
d186aac6 MD |
602 | #if GUILE_ISELECT |
603 | if (newthread == coop_global_curr) | |
604 | return; | |
605 | #else | |
7bfd3b9e JB |
606 | if (newthread == NULL) |
607 | return; | |
d186aac6 | 608 | #endif |
7bfd3b9e JB |
609 | |
610 | old = coop_global_curr; | |
611 | ||
612 | coop_global_curr = newthread; | |
613 | QT_BLOCK (coop_yieldhelp, old, &coop_global_runq, newthread->sp); | |
614 | } | |
615 | ||
616 | ||
617 | #ifdef __STDC__ | |
618 | static void * | |
619 | coop_yieldhelp (qt_t *sp, void *old, void *blockq) | |
620 | #else | |
621 | static void * | |
622 | coop_yieldhelp (sp, old, blockq) | |
623 | qt_t *sp; | |
624 | void *old; | |
625 | void *blockq; | |
626 | #endif | |
627 | { | |
628 | ((coop_t *)old)->sp = sp; | |
629 | coop_qput ((coop_q_t *)blockq, (coop_t *)old); | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | /* Replacement for the system's sleep() function. Does the right thing | |
634 | for the process - but not for the system (it busy-waits) */ | |
635 | ||
636 | #ifdef __STDC__ | |
44e8413c | 637 | void * |
7bfd3b9e JB |
638 | coop_sleephelp (qt_t *sp, void *old, void *blockq) |
639 | #else | |
44e8413c | 640 | void * |
7bfd3b9e JB |
641 | coop_sleephelp (sp, old, bolckq) |
642 | qt_t *sp; | |
643 | void *old; | |
644 | void *blockq; | |
645 | #endif | |
646 | { | |
647 | ((coop_t *)old)->sp = sp; | |
648 | /* old is already on the sleep queue - so there's no need to | |
649 | do anything extra here */ | |
650 | return NULL; | |
651 | } | |
652 | ||
44e8413c MD |
653 | #ifdef GUILE_ISELECT |
654 | ||
655 | void | |
656 | usleep (unsigned usec) | |
657 | { | |
658 | struct timeval timeout; | |
659 | timeout.tv_sec = 0; | |
660 | timeout.tv_usec = usec; | |
661 | scm_internal_select (0, NULL, NULL, NULL, &timeout); | |
662 | } | |
663 | ||
664 | unsigned | |
665 | sleep (unsigned sec) | |
666 | { | |
667 | time_t now = time (NULL); | |
668 | struct timeval timeout; | |
669 | int slept; | |
670 | timeout.tv_sec = sec; | |
671 | timeout.tv_usec = 0; | |
672 | scm_internal_select (0, NULL, NULL, NULL, &timeout); | |
673 | slept = time (NULL) - now; | |
674 | return slept > sec ? 0 : sec - slept; | |
675 | } | |
676 | ||
677 | #else /* GUILE_ISELECT */ | |
678 | ||
7bfd3b9e JB |
679 | #ifdef __STDC__ |
680 | unsigned | |
681 | sleep (unsigned s) | |
682 | #else | |
683 | unsigned | |
684 | sleep (s) | |
685 | unsigned s; | |
686 | #endif | |
687 | { | |
688 | coop_t *newthread, *old; | |
44e8413c | 689 | time_t now = time (NULL); |
7bfd3b9e JB |
690 | coop_global_curr->wakeup_time = now + s; |
691 | ||
692 | /* Put the current thread on the sleep queue */ | |
693 | coop_qput (&coop_global_sleepq, coop_global_curr); | |
694 | ||
695 | newthread = coop_next_runnable_thread(); | |
696 | ||
697 | /* If newthread is the same as the sleeping thread, do nothing */ | |
698 | if (newthread == coop_global_curr) | |
699 | return s; | |
700 | ||
701 | old = coop_global_curr; | |
702 | ||
703 | coop_global_curr = newthread; | |
704 | QT_BLOCK (coop_sleephelp, old, NULL, newthread->sp); | |
705 | ||
706 | return s; | |
707 | } | |
44e8413c MD |
708 | |
709 | #endif /* GUILE_ISELECT */ |