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d823b11b | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002 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. */ |
1bbd0b84 | 41 | |
1bbd0b84 | 42 | |
7bfd3b9e JB |
43 | \f |
44 | ||
d823b11b MV |
45 | /* This file implements nice Scheme level threads on top of the gastly |
46 | C level threads. | |
7f0f3eaa JB |
47 | */ |
48 | ||
d823b11b MV |
49 | #include <unistd.h> |
50 | #include <stdio.h> | |
51 | #include <assert.h> | |
52 | #include <sys/time.h> | |
5f05c406 | 53 | |
a0599745 | 54 | #include "libguile/_scm.h" |
d823b11b MV |
55 | #include "libguile/validate.h" |
56 | #include "libguile/root.h" | |
57 | #include "libguile/eval.h" | |
58 | #include "libguile/async.h" | |
59 | #include "libguile/ports.h" | |
60 | #include "libguile/threads.h" | |
a0599745 | 61 | #include "libguile/dynwind.h" |
d823b11b | 62 | #include "libguile/iselect.h" |
7bfd3b9e | 63 | |
d823b11b | 64 | /*** Queues */ |
7bfd3b9e | 65 | |
d823b11b MV |
66 | static SCM |
67 | make_queue () | |
68 | { | |
69 | return scm_cons (SCM_EOL, SCM_EOL); | |
70 | } | |
7bfd3b9e | 71 | |
d823b11b MV |
72 | static SCM |
73 | enqueue (SCM q, SCM t) | |
74 | { | |
75 | SCM c = scm_cons (t, SCM_EOL); | |
76 | if (SCM_NULLP (SCM_CDR (q))) | |
77 | SCM_SETCDR (q, c); | |
78 | else | |
79 | SCM_SETCDR (SCM_CAR (q), c); | |
80 | SCM_SETCAR (q, c); | |
81 | return c; | |
82 | } | |
7bfd3b9e | 83 | |
d823b11b MV |
84 | static void |
85 | remqueue (SCM q, SCM c) | |
86 | { | |
87 | SCM p, prev = q; | |
88 | for (p = SCM_CDR (q); !SCM_NULLP (p); p = SCM_CDR (p)) | |
89 | { | |
90 | if (SCM_EQ_P (p, c)) | |
91 | { | |
92 | if (SCM_EQ_P (c, SCM_CAR (q))) | |
93 | SCM_SETCAR (q, SCM_CDR (c)); | |
94 | SCM_SETCDR (prev, SCM_CDR (c)); | |
95 | return; | |
96 | } | |
97 | prev = p; | |
98 | } | |
99 | abort (); | |
100 | } | |
101 | ||
102 | static SCM | |
103 | dequeue (SCM q) | |
104 | { | |
105 | SCM c = SCM_CDR (q); | |
106 | if (SCM_NULLP (c)) | |
107 | return SCM_BOOL_F; | |
108 | else | |
109 | { | |
110 | SCM_SETCDR (q, SCM_CDR (c)); | |
111 | if (SCM_NULLP (SCM_CDR (q))) | |
112 | SCM_SETCAR (q, SCM_EOL); | |
113 | return SCM_CAR (c); | |
114 | } | |
115 | } | |
7bfd3b9e | 116 | |
d823b11b MV |
117 | /*** Threads */ |
118 | ||
9bc4701c MD |
119 | #define THREAD_INITIALIZED_P(t) (t->base != NULL) |
120 | ||
121 | struct scm_thread { | |
d823b11b MV |
122 | |
123 | /* Blocking. | |
124 | */ | |
125 | scm_t_cond sleep_cond; | |
126 | struct scm_thread *next_waiting; | |
127 | ||
9bc4701c MD |
128 | /* This mutex represents this threads right to access the heap. |
129 | That right can temporarily be taken away by the GC. */ | |
130 | scm_t_mutex heap_mutex; | |
131 | int clear_freelists_p; /* set if GC was done while thread was asleep */ | |
132 | ||
d823b11b MV |
133 | scm_root_state *root; |
134 | SCM handle; | |
135 | scm_t_thread thread; | |
136 | SCM result; | |
137 | int exited; | |
138 | ||
139 | SCM joining_threads; | |
140 | ||
141 | /* For keeping track of the stack and registers. */ | |
142 | SCM_STACKITEM *base; | |
143 | SCM_STACKITEM *top; | |
144 | jmp_buf regs; | |
145 | ||
9bc4701c | 146 | }; |
d823b11b MV |
147 | |
148 | static SCM | |
149 | make_thread (SCM creation_protects) | |
150 | { | |
151 | SCM z; | |
152 | scm_thread *t; | |
153 | z = scm_make_smob (scm_tc16_thread); | |
154 | t = SCM_THREAD_DATA (z); | |
155 | t->handle = z; | |
156 | t->result = creation_protects; | |
157 | t->base = NULL; | |
158 | t->joining_threads = make_queue (); | |
9bc4701c MD |
159 | scm_i_plugin_cond_init (&t->sleep_cond, 0); |
160 | scm_i_plugin_mutex_init (&t->heap_mutex, 0); | |
161 | t->clear_freelists_p = 0; | |
d823b11b MV |
162 | t->exited = 0; |
163 | return z; | |
164 | } | |
165 | ||
166 | static void | |
9bc4701c MD |
167 | init_thread_creatant (SCM thread, |
168 | SCM_STACKITEM *base) | |
d823b11b | 169 | { |
9bc4701c MD |
170 | scm_thread *t = SCM_THREAD_DATA (thread); |
171 | t->thread = scm_thread_self (); | |
d823b11b MV |
172 | t->base = base; |
173 | t->top = NULL; | |
174 | } | |
4079f87e | 175 | |
d823b11b MV |
176 | static SCM |
177 | thread_mark (SCM obj) | |
178 | { | |
179 | scm_thread *t = SCM_THREAD_DATA (obj); | |
180 | scm_gc_mark (t->result); | |
181 | scm_gc_mark (t->joining_threads); | |
9bc4701c | 182 | return t->root->handle; /* mark root-state of this thread */ |
d823b11b MV |
183 | } |
184 | ||
185 | static int | |
186 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
187 | { | |
188 | scm_thread *t = SCM_THREAD_DATA (exp); | |
189 | scm_puts ("#<thread ", port); | |
190 | scm_intprint ((unsigned long)t, 16, port); | |
191 | scm_putc ('>', port); | |
192 | return 1; | |
193 | } | |
194 | ||
195 | static size_t | |
196 | thread_free (SCM obj) | |
197 | { | |
198 | scm_thread *t = SCM_THREAD_DATA (obj); | |
199 | if (!t->exited) | |
200 | abort (); | |
201 | scm_gc_free (t, sizeof (*t), "thread"); | |
202 | return 0; | |
203 | } | |
204 | ||
d823b11b | 205 | /*** Scheduling */ |
f7eca35d | 206 | |
9bc4701c MD |
207 | #define cur_thread (SCM_CURRENT_THREAD->handle) |
208 | scm_t_key scm_i_thread_key; | |
209 | scm_t_key scm_i_root_state_key; | |
d823b11b MV |
210 | |
211 | void | |
212 | scm_i_set_thread_data (void *data) | |
213 | { | |
9bc4701c MD |
214 | scm_thread *t = SCM_CURRENT_THREAD; |
215 | scm_setspecific (scm_i_root_state_key, data); | |
d823b11b MV |
216 | t->root = (scm_root_state *)data; |
217 | } | |
218 | ||
219 | static void | |
220 | resume (scm_thread *t) | |
221 | { | |
d823b11b | 222 | t->top = NULL; |
9bc4701c MD |
223 | if (t->clear_freelists_p) |
224 | { | |
225 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
226 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
227 | t->clear_freelists_p = 0; | |
228 | } | |
d823b11b MV |
229 | } |
230 | ||
9bc4701c MD |
231 | void |
232 | scm_i_enter_guile (scm_thread *t) | |
d823b11b | 233 | { |
9bc4701c | 234 | scm_i_plugin_mutex_lock (&t->heap_mutex); |
d823b11b MV |
235 | resume (t); |
236 | } | |
237 | ||
238 | static scm_thread * | |
239 | suspend () | |
240 | { | |
9bc4701c | 241 | scm_thread *c = SCM_CURRENT_THREAD; |
d823b11b MV |
242 | |
243 | /* record top of stack for the GC */ | |
244 | c->top = (SCM_STACKITEM *)&c; | |
245 | /* save registers. */ | |
246 | SCM_FLUSH_REGISTER_WINDOWS; | |
247 | setjmp (c->regs); | |
248 | ||
249 | return c; | |
250 | } | |
251 | ||
9bc4701c MD |
252 | scm_thread * |
253 | scm_i_leave_guile () | |
d823b11b | 254 | { |
9bc4701c MD |
255 | scm_thread *t = suspend (); |
256 | scm_i_plugin_mutex_unlock (&t->heap_mutex); | |
257 | return t; | |
d823b11b MV |
258 | } |
259 | ||
260 | /* Put the current thread to sleep until it is explicitely unblocked. | |
261 | */ | |
262 | static int | |
263 | block () | |
264 | { | |
265 | int err; | |
266 | scm_thread *t = suspend (); | |
9bc4701c | 267 | err = scm_i_plugin_cond_wait (&t->sleep_cond, &t->heap_mutex); |
d823b11b MV |
268 | resume (t); |
269 | return err; | |
270 | } | |
271 | ||
272 | /* Put the current thread to sleep until it is explicitely unblocked | |
273 | or until a signal arrives or until time AT (absolute time) is | |
274 | reached. Return 0 when it has been unblocked; errno otherwise. | |
275 | */ | |
276 | static int | |
9bc4701c | 277 | timed_block (const struct timespec *at) |
d823b11b MV |
278 | { |
279 | int err; | |
280 | scm_thread *t = suspend (); | |
9bc4701c | 281 | err = scm_i_plugin_cond_timedwait (&t->sleep_cond, &t->heap_mutex, at); |
d823b11b MV |
282 | resume (t); |
283 | return err; | |
284 | } | |
285 | ||
286 | /* Unblock a sleeping thread. | |
287 | */ | |
288 | static void | |
289 | unblock (scm_thread *t) | |
290 | { | |
9bc4701c | 291 | scm_i_plugin_cond_signal (&t->sleep_cond); |
d823b11b MV |
292 | } |
293 | ||
294 | /*** Thread creation */ | |
295 | ||
9bc4701c | 296 | static scm_t_mutex thread_admin_mutex; |
d823b11b MV |
297 | static SCM all_threads; |
298 | static int thread_count; | |
299 | ||
300 | typedef struct launch_data { | |
301 | SCM thread; | |
302 | SCM rootcont; | |
303 | scm_t_catch_body body; | |
304 | void *body_data; | |
305 | scm_t_catch_handler handler; | |
306 | void *handler_data; | |
307 | } launch_data; | |
308 | ||
309 | static SCM | |
310 | body_bootstrip (launch_data* data) | |
311 | { | |
312 | /* First save the new root continuation */ | |
313 | data->rootcont = scm_root->rootcont; | |
314 | return (data->body) (data->body_data); | |
315 | } | |
316 | ||
317 | static SCM | |
318 | handler_bootstrip (launch_data* data, SCM tag, SCM throw_args) | |
319 | { | |
320 | scm_root->rootcont = data->rootcont; | |
321 | return (data->handler) (data->handler_data, tag, throw_args); | |
322 | } | |
323 | ||
324 | static void | |
325 | really_launch (SCM_STACKITEM *base, launch_data *data) | |
326 | { | |
9bc4701c MD |
327 | SCM thread; |
328 | scm_thread *t; | |
329 | thread = data->thread; | |
330 | t = SCM_THREAD_DATA (thread); | |
331 | SCM_FREELIST_CREATE (scm_i_freelist); | |
332 | SCM_FREELIST_CREATE (scm_i_freelist2); | |
333 | scm_setspecific (scm_i_thread_key, t); | |
334 | scm_setspecific (scm_i_root_state_key, t->root); | |
335 | scm_i_plugin_mutex_lock (&t->heap_mutex); /* ensure that we "own" the heap */ | |
336 | init_thread_creatant (thread, base); /* must own the heap */ | |
337 | ||
d823b11b MV |
338 | data->rootcont = SCM_BOOL_F; |
339 | t->result = | |
340 | scm_internal_cwdr ((scm_t_catch_body) body_bootstrip, | |
341 | data, | |
342 | (scm_t_catch_handler) handler_bootstrip, | |
343 | data, base); | |
c4c52ebe | 344 | scm_i_plugin_mutex_unlock (&t->heap_mutex); /* release the heap */ |
d823b11b MV |
345 | free (data); |
346 | ||
9bc4701c MD |
347 | scm_i_plugin_mutex_lock (&thread_admin_mutex); |
348 | all_threads = scm_delq_x (thread, all_threads); | |
d823b11b MV |
349 | t->exited = 1; |
350 | thread_count--; | |
9bc4701c MD |
351 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); |
352 | /* We're leaving with heap_mutex still locked. */ | |
c4c52ebe | 353 | scm_thread_detach (t->thread); |
d823b11b MV |
354 | } |
355 | ||
9bc4701c | 356 | static void * |
d823b11b MV |
357 | launch_thread (void *p) |
358 | { | |
359 | really_launch ((SCM_STACKITEM *)&p, (launch_data *)p); | |
9bc4701c | 360 | return 0; |
d823b11b MV |
361 | } |
362 | ||
363 | static SCM | |
364 | create_thread (scm_t_catch_body body, void *body_data, | |
365 | scm_t_catch_handler handler, void *handler_data, | |
366 | SCM protects) | |
367 | { | |
368 | SCM thread; | |
369 | ||
370 | /* Make new thread. The first thing the new thread will do is to | |
371 | lock guile_mutex. Thus, we can safely complete its | |
372 | initialization after creating it. While the new thread starts, | |
373 | all its data is protected via all_threads. | |
374 | */ | |
375 | ||
376 | { | |
377 | scm_t_thread th; | |
c4c52ebe | 378 | SCM root, old_winds; |
d823b11b | 379 | launch_data *data; |
9bc4701c | 380 | scm_thread *t; |
d823b11b MV |
381 | int err; |
382 | ||
383 | /* Unwind wind chain. */ | |
384 | old_winds = scm_dynwinds; | |
385 | scm_dowinds (SCM_EOL, scm_ilength (scm_root->dynwinds)); | |
386 | ||
387 | /* Allocate thread locals. */ | |
388 | root = scm_make_root (scm_root->handle); | |
389 | data = scm_malloc (sizeof (launch_data)); | |
390 | ||
391 | /* Make thread. */ | |
392 | thread = make_thread (protects); | |
393 | data->thread = thread; | |
394 | data->body = body; | |
395 | data->body_data = body_data; | |
396 | data->handler = handler; | |
397 | data->handler_data = handler_data; | |
9bc4701c MD |
398 | t = SCM_THREAD_DATA (thread); |
399 | /* must initialize root state pointer before the thread is linked | |
400 | into all_threads */ | |
401 | t->root = SCM_ROOT_STATE (root); | |
402 | ||
403 | /* In order to avoid the need of synchronization between parent | |
404 | and child thread, we need to insert the child into all_threads | |
405 | before creation. */ | |
c4c52ebe MD |
406 | { |
407 | SCM new_threads = scm_cons (thread, SCM_BOOL_F); /* could cause GC */ | |
408 | scm_thread *parent = scm_i_leave_guile (); /* to prevent deadlock */ | |
409 | scm_i_plugin_mutex_lock (&thread_admin_mutex); | |
410 | SCM_SETCDR (new_threads, all_threads); | |
411 | all_threads = new_threads; | |
412 | thread_count++; | |
413 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); | |
414 | scm_i_enter_guile (parent); | |
415 | } | |
9bc4701c MD |
416 | |
417 | err = scm_i_plugin_thread_create (&th, 0, launch_thread, (void *) data); | |
418 | if (err != 0) | |
d823b11b | 419 | { |
9bc4701c MD |
420 | scm_i_plugin_mutex_lock (&thread_admin_mutex); |
421 | all_threads = scm_delq_x (thread, all_threads); | |
422 | ((scm_thread *) SCM_THREAD_DATA(thread))->exited = 1; | |
423 | thread_count--; | |
424 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 425 | } |
d823b11b MV |
426 | |
427 | /* Return to old dynamic context. */ | |
428 | scm_dowinds (old_winds, - scm_ilength (old_winds)); | |
429 | ||
430 | if (err) | |
431 | { | |
432 | errno = err; | |
433 | scm_syserror ("create-thread"); | |
434 | } | |
435 | } | |
436 | ||
437 | return thread; | |
438 | } | |
439 | ||
440 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 2, 0, 0, | |
441 | (SCM thunk, SCM handler), | |
442 | "Evaluate @var{(thunk)} in a new thread, and new dynamic context, " | |
443 | "returning a new thread object representing the thread. " | |
444 | "If an error occurs during evaluation, call error-thunk, passing it an " | |
445 | "error code describing the condition. " | |
446 | "If this happens, the error-thunk is called outside the scope of the new " | |
447 | "root -- it is called in the same dynamic context in which " | |
448 | "with-new-thread was evaluated, but not in the callers thread. " | |
449 | "All the evaluation rules for dynamic roots apply to threads.") | |
450 | #define FUNC_NAME s_scm_call_with_new_thread | |
451 | { | |
452 | SCM_ASSERT (SCM_NFALSEP (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); | |
453 | SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (handler)), handler, SCM_ARG2, | |
454 | FUNC_NAME); | |
455 | ||
456 | return create_thread ((scm_t_catch_body) scm_call_0, thunk, | |
457 | (scm_t_catch_handler) scm_apply_1, handler, | |
458 | scm_cons (thunk, handler)); | |
459 | } | |
460 | #undef FUNC_NAME | |
461 | ||
d823b11b | 462 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 463 | (SCM thread), |
d823b11b MV |
464 | "Suspend execution of the calling thread until the target @var{thread} " |
465 | "terminates, unless the target @var{thread} has already terminated. ") | |
466 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 467 | { |
d823b11b MV |
468 | scm_thread *t; |
469 | SCM res; | |
470 | ||
471 | SCM_VALIDATE_THREAD (1, thread); | |
472 | if (SCM_EQ_P (cur_thread, thread)) | |
473 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); | |
474 | ||
475 | t = SCM_THREAD_DATA (thread); | |
476 | if (!t->exited) | |
477 | { | |
9bc4701c MD |
478 | scm_thread *c = scm_i_leave_guile (); |
479 | while (!THREAD_INITIALIZED_P (t)) | |
480 | SCM_TICK; | |
481 | scm_thread_join (t->thread, 0); | |
482 | scm_i_enter_guile (c); | |
d823b11b MV |
483 | } |
484 | res = t->result; | |
485 | t->result = SCM_BOOL_F; | |
486 | return res; | |
5f05c406 MV |
487 | } |
488 | #undef FUNC_NAME | |
489 | ||
9bc4701c | 490 | /*** Fair mutexes */ |
4079f87e | 491 | |
d823b11b MV |
492 | /* We implement our own mutex type since we want them to be 'fair', we |
493 | want to do fancy things while waiting for them (like running | |
494 | asyncs) and we want to support waiting on many things at once. | |
495 | Also, we might add things that are nice for debugging. | |
496 | */ | |
4079f87e | 497 | |
9bc4701c | 498 | typedef struct fair_mutex { |
d823b11b | 499 | /* the thread currently owning the mutex, or SCM_BOOL_F. */ |
9bc4701c MD |
500 | scm_t_mutex lock; |
501 | int lockedp; | |
d823b11b MV |
502 | SCM owner; |
503 | /* how much the owner owns us. */ | |
504 | int level; | |
505 | /* the threads waiting for this mutex. */ | |
506 | SCM waiting; | |
9bc4701c | 507 | } fair_mutex; |
5f05c406 | 508 | |
d823b11b | 509 | static SCM |
9bc4701c | 510 | fair_mutex_mark (SCM mx) |
d823b11b | 511 | { |
9bc4701c | 512 | fair_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
513 | scm_gc_mark (m->owner); |
514 | return m->waiting; | |
515 | } | |
4079f87e | 516 | |
9bc4701c | 517 | SCM_DEFINE (scm_make_fair_mutex, "make-fair-mutex", 0, 0, 0, |
d823b11b | 518 | (void), |
9bc4701c MD |
519 | "Create a new fair mutex object. ") |
520 | #define FUNC_NAME s_scm_make_fair_mutex | |
d823b11b | 521 | { |
9bc4701c MD |
522 | SCM mx = scm_make_smob (scm_tc16_fair_mutex); |
523 | fair_mutex *m = SCM_MUTEX_DATA (mx); | |
524 | scm_i_plugin_mutex_init (&m->lock, 0); | |
525 | m->lockedp = 0; | |
d823b11b MV |
526 | m->owner = SCM_BOOL_F; |
527 | m->level = 0; | |
528 | m->waiting = make_queue (); | |
529 | return mx; | |
530 | } | |
531 | #undef FUNC_NAME | |
4079f87e | 532 | |
9bc4701c MD |
533 | static int |
534 | fair_mutex_lock (fair_mutex *m) | |
d823b11b | 535 | { |
9bc4701c MD |
536 | scm_i_plugin_mutex_lock (&m->lock); |
537 | #if 0 | |
538 | /* Need to wait if another thread is just temporarily unlocking. | |
539 | This is happens very seldom and only when the other thread is | |
540 | between scm_mutex_unlock and scm_i_plugin_mutex_lock below. */ | |
541 | while (m->lockedp) | |
542 | SCM_TICK; | |
543 | m->lockedp = 1; | |
544 | #endif | |
545 | ||
d823b11b MV |
546 | if (m->owner == SCM_BOOL_F) |
547 | m->owner = cur_thread; | |
548 | else if (m->owner == cur_thread) | |
549 | m->level++; | |
550 | else | |
551 | { | |
552 | while (1) | |
553 | { | |
554 | SCM c = enqueue (m->waiting, cur_thread); | |
9bc4701c MD |
555 | int err; |
556 | /* Note: It's important that m->lock is never locked for | |
557 | any longer amount of time since that could prevent GC */ | |
558 | scm_i_plugin_mutex_unlock (&m->lock); | |
559 | err = block (); | |
d823b11b | 560 | if (m->owner == cur_thread) |
9bc4701c MD |
561 | return 0; |
562 | scm_i_plugin_mutex_lock (&m->lock); | |
d823b11b | 563 | remqueue (m->waiting, c); |
9bc4701c | 564 | scm_i_plugin_mutex_unlock (&m->lock); |
d823b11b | 565 | if (err) |
9bc4701c | 566 | return err; |
d823b11b | 567 | SCM_ASYNC_TICK; |
9bc4701c | 568 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
569 | } |
570 | } | |
9bc4701c MD |
571 | scm_i_plugin_mutex_unlock (&m->lock); |
572 | return 0; | |
d823b11b | 573 | } |
7bfd3b9e | 574 | |
9bc4701c MD |
575 | static int |
576 | fair_mutex_trylock (fair_mutex *m) | |
d823b11b | 577 | { |
9bc4701c | 578 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
579 | if (m->owner == SCM_BOOL_F) |
580 | m->owner = cur_thread; | |
581 | else if (m->owner == cur_thread) | |
582 | m->level++; | |
583 | else | |
9bc4701c MD |
584 | { |
585 | scm_i_plugin_mutex_unlock (&m->lock); | |
586 | return EBUSY; | |
587 | } | |
588 | scm_i_plugin_mutex_unlock (&m->lock); | |
589 | return 0; | |
d823b11b | 590 | } |
d823b11b | 591 | |
9bc4701c MD |
592 | static int |
593 | fair_mutex_unlock (fair_mutex *m) | |
5f05c406 | 594 | { |
9bc4701c | 595 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
596 | if (m->owner != cur_thread) |
597 | { | |
9bc4701c MD |
598 | scm_i_plugin_mutex_unlock (&m->lock); |
599 | return EPERM; | |
d823b11b MV |
600 | } |
601 | else if (m->level > 0) | |
602 | m->level--; | |
603 | else | |
604 | { | |
605 | SCM next = dequeue (m->waiting); | |
606 | if (!SCM_FALSEP (next)) | |
607 | { | |
608 | m->owner = next; | |
609 | unblock (SCM_THREAD_DATA (next)); | |
d823b11b MV |
610 | } |
611 | else | |
612 | m->owner = SCM_BOOL_F; | |
613 | } | |
9bc4701c MD |
614 | scm_i_plugin_mutex_unlock (&m->lock); |
615 | return 0; | |
5f05c406 MV |
616 | } |
617 | ||
9bc4701c | 618 | /*** Fair condition variables */ |
7bfd3b9e | 619 | |
d823b11b MV |
620 | /* Like mutexes, we implement our own condition variables using the |
621 | primitives above. | |
622 | */ | |
5f05c406 | 623 | |
9bc4701c MD |
624 | typedef struct fair_cond { |
625 | scm_t_mutex lock; | |
d823b11b MV |
626 | /* the threads waiting for this condition. */ |
627 | SCM waiting; | |
9bc4701c | 628 | } fair_cond; |
5f05c406 | 629 | |
d823b11b | 630 | static SCM |
9bc4701c | 631 | fair_cond_mark (SCM cv) |
5f05c406 | 632 | { |
9bc4701c | 633 | fair_cond *c = SCM_CONDVAR_DATA (cv); |
d823b11b | 634 | return c->waiting; |
5f05c406 MV |
635 | } |
636 | ||
9bc4701c MD |
637 | SCM_DEFINE (scm_make_fair_condition_variable, "make-fair-condition-variable", 0, 0, 0, |
638 | (void), | |
639 | "Make a new fair condition variable.") | |
640 | #define FUNC_NAME s_scm_make_fair_condition_variable | |
641 | { | |
642 | SCM cv = scm_make_smob (scm_tc16_fair_condvar); | |
643 | fair_cond *c = SCM_CONDVAR_DATA (cv); | |
644 | scm_i_plugin_mutex_init (&c->lock, 0); | |
645 | c->waiting = make_queue (); | |
646 | return cv; | |
647 | } | |
648 | #undef FUNC_NAME | |
649 | ||
650 | static int | |
651 | fair_cond_timedwait (fair_cond *c, | |
652 | fair_mutex *m, | |
653 | const struct timespec *waittime) | |
654 | { | |
655 | int err; | |
656 | scm_i_plugin_mutex_lock (&c->lock); | |
657 | ||
658 | while (1) | |
659 | { | |
660 | enqueue (c->waiting, cur_thread); | |
661 | scm_i_plugin_mutex_unlock (&c->lock); | |
662 | fair_mutex_unlock (m); /*fixme* - not thread safe */ | |
663 | if (waittime == NULL) | |
664 | err = block (); | |
665 | else | |
666 | err = timed_block (waittime); | |
667 | fair_mutex_lock (m); | |
668 | if (err) | |
669 | return err; | |
670 | /* XXX - check whether we have been signalled. */ | |
671 | break; | |
672 | } | |
673 | return err; | |
674 | } | |
675 | ||
676 | static int | |
677 | fair_cond_signal (fair_cond *c) | |
678 | { | |
679 | SCM th; | |
680 | scm_i_plugin_mutex_lock (&c->lock); | |
681 | if (!SCM_FALSEP (th = dequeue (c->waiting))) | |
682 | unblock (SCM_THREAD_DATA (th)); | |
683 | scm_i_plugin_mutex_unlock (&c->lock); | |
684 | return 0; | |
685 | } | |
686 | ||
687 | static int | |
688 | fair_cond_broadcast (fair_cond *c) | |
689 | { | |
690 | SCM th; | |
691 | scm_i_plugin_mutex_lock (&c->lock); | |
692 | while (!SCM_FALSEP (th = dequeue (c->waiting))) | |
693 | unblock (SCM_THREAD_DATA (th)); | |
694 | scm_i_plugin_mutex_unlock (&c->lock); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | /*** Mutexes */ | |
699 | ||
700 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, | |
701 | (void), | |
702 | "Create a new mutex object. ") | |
703 | #define FUNC_NAME s_scm_make_mutex | |
704 | { | |
705 | SCM mx = scm_make_smob (scm_tc16_mutex); | |
706 | scm_i_plugin_mutex_init (SCM_MUTEX_DATA (mx), 0); | |
707 | return mx; | |
708 | } | |
709 | #undef FUNC_NAME | |
710 | ||
711 | /*fixme* change documentation */ | |
712 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, | |
713 | (SCM mx), | |
714 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
715 | "blocks until the mutex becomes available. The function returns when " | |
716 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
717 | "a thread already owns will succeed right away and will not block the " | |
718 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
719 | #define FUNC_NAME s_scm_lock_mutex | |
720 | { | |
721 | int err; | |
722 | SCM_VALIDATE_MUTEX (1, mx); | |
723 | ||
724 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
725 | err = fair_mutex_lock (SCM_MUTEX_DATA (mx)); | |
726 | else | |
727 | { | |
728 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
729 | scm_thread *t = scm_i_leave_guile (); | |
730 | err = scm_i_plugin_mutex_lock (m); | |
731 | scm_i_enter_guile (t); | |
732 | } | |
733 | ||
734 | if (err) | |
735 | { | |
736 | errno = err; | |
737 | SCM_SYSERROR; | |
738 | } | |
739 | return SCM_BOOL_T; | |
740 | } | |
741 | #undef FUNC_NAME | |
742 | ||
743 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, | |
744 | (SCM mx), | |
745 | "Try to lock @var{mutex}. If the mutex is already locked by someone " | |
746 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
747 | #define FUNC_NAME s_scm_try_mutex | |
748 | { | |
749 | int err; | |
750 | SCM_VALIDATE_MUTEX (1, mx); | |
751 | ||
752 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
753 | err = fair_mutex_trylock (SCM_MUTEX_DATA (mx)); | |
754 | else | |
755 | { | |
756 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
757 | scm_thread *t = scm_i_leave_guile (); | |
758 | err = scm_i_plugin_mutex_trylock (m); | |
759 | scm_i_enter_guile (t); | |
760 | } | |
761 | ||
762 | if (err == EBUSY) | |
763 | return SCM_BOOL_F; | |
764 | ||
765 | if (err) | |
766 | { | |
767 | errno = err; | |
768 | SCM_SYSERROR; | |
769 | } | |
770 | ||
771 | return SCM_BOOL_T; | |
772 | } | |
773 | #undef FUNC_NAME | |
774 | ||
775 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
776 | (SCM mx), | |
777 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
778 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
779 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
780 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
781 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
782 | "with a call to @code{unlock-mutex}. Only the last call to " | |
783 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
784 | #define FUNC_NAME s_scm_unlock_mutex | |
785 | { | |
786 | int err; | |
787 | SCM_VALIDATE_MUTEX (1, mx); | |
788 | ||
789 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
790 | { | |
791 | err = fair_mutex_unlock (SCM_MUTEX_DATA (mx)); | |
792 | if (err == EPERM) | |
793 | { | |
794 | fair_mutex *m = SCM_MUTEX_DATA (mx); | |
795 | if (m->owner != cur_thread) | |
796 | { | |
797 | if (m->owner == SCM_BOOL_F) | |
798 | SCM_MISC_ERROR ("mutex not locked", SCM_EOL); | |
799 | else | |
800 | SCM_MISC_ERROR ("mutex not locked by this thread", SCM_EOL); | |
801 | } | |
802 | } | |
803 | } | |
804 | else | |
805 | { | |
806 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
807 | err = scm_i_plugin_mutex_unlock (m); | |
808 | } | |
809 | ||
810 | if (err) | |
811 | { | |
812 | errno = err; | |
813 | SCM_SYSERROR; | |
814 | } | |
815 | return SCM_BOOL_T; | |
816 | } | |
817 | #undef FUNC_NAME | |
818 | ||
819 | /*** Condition variables */ | |
820 | ||
d823b11b MV |
821 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
822 | (void), | |
823 | "Make a new condition variable.") | |
824 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 825 | { |
d823b11b | 826 | SCM cv = scm_make_smob (scm_tc16_condvar); |
9bc4701c | 827 | scm_i_plugin_cond_init (SCM_CONDVAR_DATA (cv), 0); |
d823b11b | 828 | return cv; |
5f05c406 | 829 | } |
d823b11b | 830 | #undef FUNC_NAME |
5f05c406 | 831 | |
d823b11b MV |
832 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
833 | (SCM cv, SCM mx, SCM t), | |
834 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
835 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
836 | "is locked again when this function returns. When @var{time} is given, " | |
837 | "it specifies a point in time where the waiting should be aborted. It " | |
838 | "can be either a integer as returned by @code{current-time} or a pair " | |
839 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
840 | "mutex is locked and @code{#f} is returned. When the condition " | |
841 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
842 | "is returned. ") | |
843 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 844 | { |
d823b11b MV |
845 | struct timespec waittime; |
846 | int err; | |
847 | ||
848 | SCM_VALIDATE_CONDVAR (1, cv); | |
849 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c MD |
850 | if (!((SCM_TYP16 (cv) == scm_tc16_condvar |
851 | && SCM_TYP16 (mx) == scm_tc16_mutex) | |
852 | || (SCM_TYP16 (cv) == scm_tc16_fair_condvar | |
853 | && SCM_TYP16 (mx) == scm_tc16_fair_mutex))) | |
854 | SCM_MISC_ERROR ("Condition variable and mutex are of different kinds.", | |
855 | SCM_EOL); | |
856 | ||
d823b11b MV |
857 | if (!SCM_UNBNDP (t)) |
858 | { | |
859 | if (SCM_CONSP (t)) | |
860 | { | |
9bc4701c MD |
861 | SCM_VALIDATE_UINT_COPY (3, SCM_CAR (t), waittime.tv_sec); |
862 | SCM_VALIDATE_UINT_COPY (3, SCM_CDR (t), waittime.tv_nsec); | |
d823b11b MV |
863 | waittime.tv_nsec *= 1000; |
864 | } | |
865 | else | |
866 | { | |
867 | SCM_VALIDATE_UINT_COPY (3, t, waittime.tv_sec); | |
868 | waittime.tv_nsec = 0; | |
869 | } | |
870 | } | |
871 | ||
9bc4701c MD |
872 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
873 | err = fair_cond_timedwait (SCM_CONDVAR_DATA (cv), | |
874 | SCM_MUTEX_DATA (mx), | |
875 | SCM_UNBNDP (t) ? NULL : &waittime); | |
876 | else | |
877 | { | |
878 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
879 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
880 | scm_thread *t = scm_i_leave_guile (); | |
881 | err = scm_i_plugin_cond_wait (c, m); | |
882 | scm_i_enter_guile (t); | |
883 | } | |
d823b11b | 884 | |
9bc4701c | 885 | if (err) |
d823b11b | 886 | { |
9bc4701c MD |
887 | errno = err; |
888 | SCM_SYSERROR; | |
d823b11b | 889 | } |
9bc4701c | 890 | return SCM_BOOL_T; |
5f05c406 | 891 | } |
d823b11b | 892 | #undef FUNC_NAME |
5f05c406 | 893 | |
d823b11b MV |
894 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
895 | (SCM cv), | |
896 | "Wake up one thread that is waiting for @var{cv}") | |
897 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 898 | { |
d823b11b | 899 | SCM_VALIDATE_CONDVAR (1, cv); |
9bc4701c MD |
900 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
901 | fair_cond_signal (SCM_CONDVAR_DATA (cv)); | |
902 | else | |
903 | { | |
904 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
905 | scm_i_plugin_cond_signal (c); | |
906 | } | |
d823b11b | 907 | return SCM_BOOL_T; |
5f05c406 | 908 | } |
d823b11b | 909 | #undef FUNC_NAME |
5f05c406 | 910 | |
d823b11b MV |
911 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
912 | (SCM cv), | |
913 | "Wake up all threads that are waiting for @var{cv}. ") | |
914 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 915 | { |
d823b11b | 916 | SCM_VALIDATE_CONDVAR (1, cv); |
9bc4701c MD |
917 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
918 | fair_cond_broadcast (SCM_CONDVAR_DATA (cv)); | |
919 | else | |
920 | { | |
921 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
922 | scm_i_plugin_cond_broadcast (c); | |
923 | } | |
d823b11b | 924 | return SCM_BOOL_T; |
5f05c406 | 925 | } |
d823b11b | 926 | #undef FUNC_NAME |
5f05c406 | 927 | |
d823b11b MV |
928 | /*** Marking stacks */ |
929 | ||
930 | /* XXX - what to do with this? Do we need to handle this for blocked | |
931 | threads as well? | |
932 | */ | |
933 | #ifdef __ia64__ | |
934 | # define SCM_MARK_BACKING_STORE() do { \ | |
935 | ucontext_t ctx; \ | |
936 | SCM_STACKITEM * top, * bot; \ | |
937 | getcontext (&ctx); \ | |
938 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
939 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
940 | / sizeof (SCM_STACKITEM))); \ | |
941 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
942 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
943 | scm_mark_locations (bot, top - bot); } while (0) | |
944 | #else | |
945 | # define SCM_MARK_BACKING_STORE() | |
946 | #endif | |
947 | ||
948 | void | |
949 | scm_threads_mark_stacks (void) | |
5f05c406 | 950 | { |
d823b11b MV |
951 | volatile SCM c; |
952 | for (c = all_threads; !SCM_NULLP (c); c = SCM_CDR (c)) | |
953 | { | |
954 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (c)); | |
9bc4701c | 955 | if (!THREAD_INITIALIZED_P (t)) |
d823b11b MV |
956 | { |
957 | /* Not fully initialized yet. */ | |
958 | continue; | |
959 | } | |
960 | if (t->top == NULL) | |
961 | { | |
9bc4701c MD |
962 | long stack_len; |
963 | #ifdef SCM_DEBUG | |
964 | if (t->thread != scm_thread_self ()) | |
965 | abort (); | |
966 | #endif | |
d823b11b MV |
967 | /* Active thread */ |
968 | /* stack_len is long rather than sizet in order to guarantee | |
969 | that &stack_len is long aligned */ | |
970 | #ifdef STACK_GROWS_UP | |
9bc4701c MD |
971 | stack_len = ((SCM_STACKITEM *) (&t) - |
972 | (SCM_STACKITEM *) thread->base); | |
d823b11b MV |
973 | |
974 | /* Protect from the C stack. This must be the first marking | |
975 | * done because it provides information about what objects | |
976 | * are "in-use" by the C code. "in-use" objects are those | |
977 | * for which the information about length and base address must | |
978 | * remain usable. This requirement is stricter than a liveness | |
979 | * requirement -- in particular, it constrains the implementation | |
980 | * of scm_resizuve. | |
981 | */ | |
982 | SCM_FLUSH_REGISTER_WINDOWS; | |
983 | /* This assumes that all registers are saved into the jmp_buf */ | |
984 | setjmp (scm_save_regs_gc_mark); | |
985 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
986 | ((size_t) sizeof scm_save_regs_gc_mark | |
987 | / sizeof (SCM_STACKITEM))); | |
988 | ||
989 | scm_mark_locations (((size_t) t->base, | |
990 | (sizet) stack_len)); | |
991 | #else | |
9bc4701c MD |
992 | stack_len = ((SCM_STACKITEM *) t->base - |
993 | (SCM_STACKITEM *) (&t)); | |
d823b11b MV |
994 | |
995 | /* Protect from the C stack. This must be the first marking | |
996 | * done because it provides information about what objects | |
997 | * are "in-use" by the C code. "in-use" objects are those | |
998 | * for which the information about length and base address must | |
999 | * remain usable. This requirement is stricter than a liveness | |
1000 | * requirement -- in particular, it constrains the implementation | |
1001 | * of scm_resizuve. | |
1002 | */ | |
1003 | SCM_FLUSH_REGISTER_WINDOWS; | |
1004 | /* This assumes that all registers are saved into the jmp_buf */ | |
1005 | setjmp (scm_save_regs_gc_mark); | |
1006 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
1007 | ((size_t) sizeof scm_save_regs_gc_mark | |
1008 | / sizeof (SCM_STACKITEM))); | |
1009 | ||
1010 | scm_mark_locations ((SCM_STACKITEM *) &t, | |
1011 | stack_len); | |
1012 | #endif | |
1013 | } | |
1014 | else | |
1015 | { | |
1016 | /* Suspended thread */ | |
1017 | #ifdef STACK_GROWS_UP | |
1018 | long stack_len = t->top - t->base; | |
1019 | scm_mark_locations (t->base, stack_len); | |
1020 | #else | |
1021 | long stack_len = t->base - t->top; | |
1022 | scm_mark_locations (t->top, stack_len); | |
1023 | #endif | |
1024 | scm_mark_locations ((SCM_STACKITEM *) t->regs, | |
1025 | ((size_t) sizeof(t->regs) | |
1026 | / sizeof (SCM_STACKITEM))); | |
1027 | } | |
1028 | } | |
5f05c406 MV |
1029 | } |
1030 | ||
d823b11b MV |
1031 | /*** Select */ |
1032 | ||
911782b7 | 1033 | int |
d823b11b MV |
1034 | scm_internal_select (int nfds, |
1035 | SELECT_TYPE *readfds, | |
1036 | SELECT_TYPE *writefds, | |
1037 | SELECT_TYPE *exceptfds, | |
1038 | struct timeval *timeout) | |
5f05c406 | 1039 | { |
d823b11b | 1040 | int res, eno; |
9bc4701c MD |
1041 | scm_thread *c = scm_i_leave_guile (); |
1042 | res = scm_i_plugin_select (nfds, readfds, writefds, exceptfds, timeout); | |
d823b11b | 1043 | eno = errno; |
9bc4701c | 1044 | scm_i_enter_guile (c); |
d823b11b MV |
1045 | SCM_ASYNC_TICK; |
1046 | errno = eno; | |
1047 | return res; | |
5f05c406 MV |
1048 | } |
1049 | ||
9bc4701c MD |
1050 | /* Low-level C API */ |
1051 | ||
1052 | SCM | |
1053 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1054 | scm_t_catch_handler handler, void *handler_data) | |
1055 | { | |
1056 | return create_thread (body, body_data, handler, handler_data, SCM_BOOL_F); | |
1057 | } | |
1058 | ||
9bc4701c MD |
1059 | int |
1060 | scm_mutex_lock (scm_t_mutex *m) | |
1061 | { | |
1062 | scm_thread *t = scm_i_leave_guile (); | |
1063 | int res = scm_i_plugin_mutex_lock (m); | |
1064 | scm_i_enter_guile (t); | |
1065 | return res; | |
1066 | } | |
1067 | ||
1068 | int | |
1069 | scm_cond_wait (scm_t_cond *c, scm_t_mutex *m) | |
1070 | { | |
1071 | scm_thread *t = scm_i_leave_guile (); | |
1072 | scm_i_plugin_cond_wait (c, m); | |
1073 | scm_i_enter_guile (t); | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | int | |
06babecc | 1078 | scm_cond_timedwait (scm_t_cond *c, scm_t_mutex *m, const struct timespec *wt) |
9bc4701c MD |
1079 | { |
1080 | scm_thread *t = scm_i_leave_guile (); | |
06babecc | 1081 | int res = scm_i_plugin_cond_timedwait (c, m, wt); |
9bc4701c MD |
1082 | scm_i_enter_guile (t); |
1083 | return res; | |
1084 | } | |
9bc4701c MD |
1085 | |
1086 | void | |
1087 | scm_enter_guile () | |
1088 | { | |
1089 | scm_i_enter_guile (SCM_CURRENT_THREAD); | |
1090 | } | |
1091 | ||
1092 | void | |
1093 | scm_leave_guile () | |
1094 | { | |
1095 | scm_i_leave_guile (); | |
1096 | } | |
1097 | ||
d823b11b MV |
1098 | unsigned long |
1099 | scm_thread_usleep (unsigned long usecs) | |
5f05c406 | 1100 | { |
d823b11b MV |
1101 | struct timeval tv; |
1102 | tv.tv_usec = usecs % 1000000; | |
1103 | tv.tv_sec = usecs / 1000000; | |
1104 | scm_internal_select (0, NULL, NULL, NULL, &tv); | |
1105 | return tv.tv_usec + tv.tv_sec*1000000; | |
5f05c406 MV |
1106 | } |
1107 | ||
d823b11b MV |
1108 | unsigned long |
1109 | scm_thread_sleep (unsigned long secs) | |
6c214b62 | 1110 | { |
d823b11b MV |
1111 | struct timeval tv; |
1112 | tv.tv_usec = 0; | |
1113 | tv.tv_sec = secs; | |
1114 | scm_internal_select (0, NULL, NULL, NULL, &tv); | |
1115 | return tv.tv_sec; | |
6c214b62 MD |
1116 | } |
1117 | ||
d823b11b MV |
1118 | /*** Misc */ |
1119 | ||
1120 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1121 | (void), | |
1122 | "Return the thread that called this function.") | |
1123 | #define FUNC_NAME s_scm_current_thread | |
1124 | { | |
1125 | return cur_thread; | |
1126 | } | |
1127 | #undef FUNC_NAME | |
1128 | ||
1129 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, | |
1130 | (void), | |
1131 | "Return a list of all threads.") | |
9bc4701c | 1132 | #define FUNC_NAME s_scm_all_threads |
d823b11b MV |
1133 | { |
1134 | return all_threads; | |
1135 | } | |
1136 | #undef FUNC_NAME | |
1137 | ||
1138 | scm_root_state * | |
1139 | scm_i_thread_root (SCM thread) | |
1140 | { | |
9bc4701c | 1141 | return ((scm_thread *) SCM_THREAD_DATA (thread))->root; |
d823b11b MV |
1142 | } |
1143 | ||
1144 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1145 | (SCM thread), | |
1146 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1147 | #define FUNC_NAME s_scm_thread_exited_p | |
1148 | { | |
1149 | return SCM_BOOL (scm_c_thread_exited_p (thread)); | |
1150 | } | |
1151 | #undef FUNC_NAME | |
1152 | ||
911782b7 | 1153 | int |
d823b11b MV |
1154 | scm_c_thread_exited_p (SCM thread) |
1155 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1156 | { |
d823b11b MV |
1157 | scm_thread *t; |
1158 | SCM_VALIDATE_THREAD (1, thread); | |
1159 | t = SCM_THREAD_DATA (thread); | |
1160 | return t->exited; | |
5f05c406 | 1161 | } |
d823b11b | 1162 | #undef FUNC_NAME |
5f05c406 | 1163 | |
9bc4701c MD |
1164 | static scm_t_cond wake_up_cond; |
1165 | int scm_i_thread_go_to_sleep; | |
9bc4701c MD |
1166 | static scm_t_mutex gc_section_mutex; |
1167 | static scm_thread *gc_section_owner; | |
1168 | static int gc_section_count = 0; | |
1169 | static int threads_initialized_p = 0; | |
1170 | ||
1171 | void | |
1172 | scm_i_thread_put_to_sleep () | |
1173 | { | |
1174 | SCM_REC_CRITICAL_SECTION_START (gc_section); | |
1175 | if (threads_initialized_p && gc_section_count == 1) | |
1176 | { | |
c4c52ebe MD |
1177 | SCM threads; |
1178 | scm_i_plugin_mutex_lock (&thread_admin_mutex); | |
1179 | threads = all_threads; | |
9bc4701c MD |
1180 | /* Signal all threads to go to sleep */ |
1181 | scm_i_thread_go_to_sleep = 1; | |
1182 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1183 | if (SCM_CAR (threads) != cur_thread) | |
1184 | { | |
1185 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
9bc4701c MD |
1186 | scm_i_plugin_mutex_lock (&t->heap_mutex); |
1187 | } | |
9bc4701c | 1188 | scm_i_thread_go_to_sleep = 0; |
c4c52ebe | 1189 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); |
9bc4701c MD |
1190 | } |
1191 | } | |
1192 | ||
b0dc3d71 MD |
1193 | void |
1194 | scm_i_thread_invalidate_freelists () | |
1195 | { | |
c4c52ebe | 1196 | /* Don't need to lock thread_admin_mutex here since we are sinle threaded */ |
b0dc3d71 MD |
1197 | SCM threads = all_threads; |
1198 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1199 | if (SCM_CAR (threads) != cur_thread) | |
1200 | { | |
1201 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
1202 | t->clear_freelists_p = 1; | |
1203 | } | |
1204 | } | |
1205 | ||
9bc4701c MD |
1206 | void |
1207 | scm_i_thread_wake_up () | |
1208 | { | |
1209 | if (threads_initialized_p && gc_section_count == 1) | |
1210 | { | |
c4c52ebe MD |
1211 | SCM threads; |
1212 | /* Need to lock since woken threads can die and be deleted from list */ | |
1213 | scm_i_plugin_mutex_lock (&thread_admin_mutex); | |
1214 | threads = all_threads; | |
9bc4701c MD |
1215 | scm_i_plugin_cond_broadcast (&wake_up_cond); |
1216 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1217 | if (SCM_CAR (threads) != cur_thread) | |
1218 | { | |
1219 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
1220 | scm_i_plugin_mutex_unlock (&t->heap_mutex); | |
1221 | } | |
c4c52ebe | 1222 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); |
9bc4701c MD |
1223 | } |
1224 | SCM_REC_CRITICAL_SECTION_END (gc_section); | |
1225 | } | |
1226 | ||
1227 | void | |
1228 | scm_i_thread_sleep_for_gc () | |
1229 | { | |
1230 | scm_thread *t; | |
1231 | t = suspend (); | |
9bc4701c | 1232 | scm_i_plugin_cond_wait (&wake_up_cond, &t->heap_mutex); |
b0dc3d71 | 1233 | resume (t); |
9bc4701c MD |
1234 | } |
1235 | ||
1236 | /* The mother of all recursive critical sections */ | |
1237 | scm_t_mutex scm_i_section_mutex; | |
1238 | ||
1239 | scm_t_mutex scm_i_critical_section_mutex; | |
1240 | scm_t_mutex scm_i_defer_mutex; | |
1241 | int scm_i_defer_count = 0; | |
1242 | scm_thread *scm_i_defer_owner = 0; | |
1243 | ||
d823b11b | 1244 | /*** Initialization */ |
7bfd3b9e | 1245 | |
9bc4701c MD |
1246 | void |
1247 | scm_threads_prehistory () | |
1248 | { | |
1249 | scm_thread *t; | |
1250 | scm_i_plugin_mutex_init (&thread_admin_mutex, 0); | |
1251 | scm_i_plugin_mutex_init (&gc_section_mutex, 0); | |
1252 | scm_i_plugin_cond_init (&wake_up_cond, 0); | |
1253 | scm_i_plugin_mutex_init (&scm_i_critical_section_mutex, 0); | |
1254 | thread_count = 1; | |
1255 | scm_i_plugin_key_create (&scm_i_thread_key, 0); | |
1256 | scm_i_plugin_key_create (&scm_i_root_state_key, 0); | |
1257 | scm_i_plugin_mutex_init (&scm_i_defer_mutex, 0); | |
1258 | scm_i_plugin_mutex_init (&scm_i_section_mutex, 0); | |
1259 | /* Allocate a fake thread object to be used during bootup. */ | |
1260 | t = malloc (sizeof (scm_thread)); | |
1261 | t->base = NULL; | |
1262 | t->clear_freelists_p = 0; | |
1263 | scm_setspecific (scm_i_thread_key, t); | |
1264 | } | |
1265 | ||
d823b11b MV |
1266 | scm_t_bits scm_tc16_thread; |
1267 | scm_t_bits scm_tc16_mutex; | |
9bc4701c | 1268 | scm_t_bits scm_tc16_fair_mutex; |
d823b11b | 1269 | scm_t_bits scm_tc16_condvar; |
9bc4701c | 1270 | scm_t_bits scm_tc16_fair_condvar; |
7bfd3b9e | 1271 | |
7bfd3b9e | 1272 | void |
d823b11b | 1273 | scm_init_threads (SCM_STACKITEM *base) |
7bfd3b9e | 1274 | { |
9bc4701c | 1275 | SCM thread; |
d823b11b | 1276 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_thread)); |
9bc4701c MD |
1277 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (scm_t_mutex)); |
1278 | scm_tc16_fair_mutex = scm_make_smob_type ("fair-mutex", | |
1279 | sizeof (fair_mutex)); | |
d823b11b | 1280 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
9bc4701c MD |
1281 | sizeof (scm_t_cond)); |
1282 | scm_tc16_fair_condvar = scm_make_smob_type ("fair-condition-variable", | |
1283 | sizeof (fair_cond)); | |
d823b11b | 1284 | |
9bc4701c MD |
1285 | thread = make_thread (SCM_BOOL_F); |
1286 | /* Replace initial fake thread with a real thread object */ | |
1287 | free (SCM_CURRENT_THREAD); | |
1288 | scm_setspecific (scm_i_thread_key, SCM_THREAD_DATA (thread)); | |
1289 | scm_i_enter_guile (SCM_CURRENT_THREAD); | |
d823b11b | 1290 | |
d823b11b | 1291 | /* root is set later from init.c */ |
9bc4701c | 1292 | init_thread_creatant (thread, base); |
d823b11b MV |
1293 | thread_count = 1; |
1294 | scm_gc_register_root (&all_threads); | |
9bc4701c | 1295 | all_threads = scm_cons (thread, SCM_EOL); |
d823b11b MV |
1296 | |
1297 | scm_set_smob_mark (scm_tc16_thread, thread_mark); | |
1298 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
1299 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
1300 | ||
9bc4701c MD |
1301 | scm_set_smob_mark (scm_tc16_fair_mutex, fair_mutex_mark); |
1302 | ||
1303 | scm_set_smob_mark (scm_tc16_fair_condvar, fair_cond_mark); | |
d823b11b | 1304 | |
9bc4701c | 1305 | threads_initialized_p = 1; |
7bfd3b9e | 1306 | } |
89e00824 | 1307 | |
5f05c406 MV |
1308 | void |
1309 | scm_init_thread_procs () | |
1310 | { | |
1311 | #include "libguile/threads.x" | |
1312 | } | |
1313 | ||
d823b11b MV |
1314 | /* XXX */ |
1315 | ||
1316 | void | |
1317 | scm_init_iselect () | |
1318 | { | |
1319 | } | |
1320 | ||
89e00824 ML |
1321 | /* |
1322 | Local Variables: | |
1323 | c-file-style: "gnu" | |
1324 | End: | |
1325 | */ |