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41c96c32 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003 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 | ||
d823b11b MV |
139 | /* For keeping track of the stack and registers. */ |
140 | SCM_STACKITEM *base; | |
141 | SCM_STACKITEM *top; | |
142 | jmp_buf regs; | |
143 | ||
9bc4701c | 144 | }; |
d823b11b MV |
145 | |
146 | static SCM | |
147 | make_thread (SCM creation_protects) | |
148 | { | |
149 | SCM z; | |
150 | scm_thread *t; | |
151 | z = scm_make_smob (scm_tc16_thread); | |
152 | t = SCM_THREAD_DATA (z); | |
153 | t->handle = z; | |
154 | t->result = creation_protects; | |
155 | t->base = NULL; | |
9bc4701c | 156 | scm_i_plugin_cond_init (&t->sleep_cond, 0); |
dea5539e | 157 | scm_i_plugin_mutex_init (&t->heap_mutex, &scm_i_plugin_mutex); |
9bc4701c | 158 | t->clear_freelists_p = 0; |
d823b11b MV |
159 | t->exited = 0; |
160 | return z; | |
161 | } | |
162 | ||
163 | static void | |
9bc4701c MD |
164 | init_thread_creatant (SCM thread, |
165 | SCM_STACKITEM *base) | |
d823b11b | 166 | { |
9bc4701c MD |
167 | scm_thread *t = SCM_THREAD_DATA (thread); |
168 | t->thread = scm_thread_self (); | |
d823b11b MV |
169 | t->base = base; |
170 | t->top = NULL; | |
171 | } | |
4079f87e | 172 | |
d823b11b MV |
173 | static SCM |
174 | thread_mark (SCM obj) | |
175 | { | |
176 | scm_thread *t = SCM_THREAD_DATA (obj); | |
177 | scm_gc_mark (t->result); | |
9bc4701c | 178 | return t->root->handle; /* mark root-state of this thread */ |
d823b11b MV |
179 | } |
180 | ||
181 | static int | |
182 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
183 | { | |
184 | scm_thread *t = SCM_THREAD_DATA (exp); | |
185 | scm_puts ("#<thread ", port); | |
1b92fb6b MD |
186 | scm_intprint ((unsigned long)t->thread, 10, port); |
187 | scm_puts (" (", port); | |
d823b11b | 188 | scm_intprint ((unsigned long)t, 16, port); |
1b92fb6b | 189 | scm_puts (")>", port); |
d823b11b MV |
190 | return 1; |
191 | } | |
192 | ||
193 | static size_t | |
194 | thread_free (SCM obj) | |
195 | { | |
196 | scm_thread *t = SCM_THREAD_DATA (obj); | |
197 | if (!t->exited) | |
198 | abort (); | |
199 | scm_gc_free (t, sizeof (*t), "thread"); | |
200 | return 0; | |
201 | } | |
202 | ||
d823b11b | 203 | /*** Scheduling */ |
f7eca35d | 204 | |
9bc4701c MD |
205 | #define cur_thread (SCM_CURRENT_THREAD->handle) |
206 | scm_t_key scm_i_thread_key; | |
207 | scm_t_key scm_i_root_state_key; | |
d823b11b MV |
208 | |
209 | void | |
210 | scm_i_set_thread_data (void *data) | |
211 | { | |
9bc4701c MD |
212 | scm_thread *t = SCM_CURRENT_THREAD; |
213 | scm_setspecific (scm_i_root_state_key, data); | |
d823b11b MV |
214 | t->root = (scm_root_state *)data; |
215 | } | |
216 | ||
217 | static void | |
218 | resume (scm_thread *t) | |
219 | { | |
d823b11b | 220 | t->top = NULL; |
9bc4701c MD |
221 | if (t->clear_freelists_p) |
222 | { | |
223 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
224 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
225 | t->clear_freelists_p = 0; | |
226 | } | |
d823b11b MV |
227 | } |
228 | ||
9bc4701c MD |
229 | void |
230 | scm_i_enter_guile (scm_thread *t) | |
d823b11b | 231 | { |
9bc4701c | 232 | scm_i_plugin_mutex_lock (&t->heap_mutex); |
d823b11b MV |
233 | resume (t); |
234 | } | |
235 | ||
236 | static scm_thread * | |
237 | suspend () | |
238 | { | |
9bc4701c | 239 | scm_thread *c = SCM_CURRENT_THREAD; |
d823b11b MV |
240 | |
241 | /* record top of stack for the GC */ | |
242 | c->top = (SCM_STACKITEM *)&c; | |
243 | /* save registers. */ | |
244 | SCM_FLUSH_REGISTER_WINDOWS; | |
245 | setjmp (c->regs); | |
246 | ||
247 | return c; | |
248 | } | |
249 | ||
9bc4701c MD |
250 | scm_thread * |
251 | scm_i_leave_guile () | |
d823b11b | 252 | { |
9bc4701c MD |
253 | scm_thread *t = suspend (); |
254 | scm_i_plugin_mutex_unlock (&t->heap_mutex); | |
255 | return t; | |
d823b11b MV |
256 | } |
257 | ||
258 | /* Put the current thread to sleep until it is explicitely unblocked. | |
259 | */ | |
260 | static int | |
261 | block () | |
262 | { | |
263 | int err; | |
264 | scm_thread *t = suspend (); | |
9bc4701c | 265 | err = scm_i_plugin_cond_wait (&t->sleep_cond, &t->heap_mutex); |
d823b11b MV |
266 | resume (t); |
267 | return err; | |
268 | } | |
269 | ||
270 | /* Put the current thread to sleep until it is explicitely unblocked | |
271 | or until a signal arrives or until time AT (absolute time) is | |
272 | reached. Return 0 when it has been unblocked; errno otherwise. | |
273 | */ | |
274 | static int | |
9bc4701c | 275 | timed_block (const struct timespec *at) |
d823b11b MV |
276 | { |
277 | int err; | |
278 | scm_thread *t = suspend (); | |
9bc4701c | 279 | err = scm_i_plugin_cond_timedwait (&t->sleep_cond, &t->heap_mutex, at); |
d823b11b MV |
280 | resume (t); |
281 | return err; | |
282 | } | |
283 | ||
284 | /* Unblock a sleeping thread. | |
285 | */ | |
286 | static void | |
287 | unblock (scm_thread *t) | |
288 | { | |
9bc4701c | 289 | scm_i_plugin_cond_signal (&t->sleep_cond); |
d823b11b MV |
290 | } |
291 | ||
292 | /*** Thread creation */ | |
293 | ||
9bc4701c | 294 | static scm_t_mutex thread_admin_mutex; |
d823b11b MV |
295 | static SCM all_threads; |
296 | static int thread_count; | |
297 | ||
298 | typedef struct launch_data { | |
299 | SCM thread; | |
300 | SCM rootcont; | |
301 | scm_t_catch_body body; | |
302 | void *body_data; | |
303 | scm_t_catch_handler handler; | |
304 | void *handler_data; | |
305 | } launch_data; | |
306 | ||
307 | static SCM | |
308 | body_bootstrip (launch_data* data) | |
309 | { | |
310 | /* First save the new root continuation */ | |
311 | data->rootcont = scm_root->rootcont; | |
312 | return (data->body) (data->body_data); | |
313 | } | |
314 | ||
315 | static SCM | |
316 | handler_bootstrip (launch_data* data, SCM tag, SCM throw_args) | |
317 | { | |
318 | scm_root->rootcont = data->rootcont; | |
319 | return (data->handler) (data->handler_data, tag, throw_args); | |
320 | } | |
321 | ||
322 | static void | |
323 | really_launch (SCM_STACKITEM *base, launch_data *data) | |
324 | { | |
9bc4701c MD |
325 | SCM thread; |
326 | scm_thread *t; | |
327 | thread = data->thread; | |
328 | t = SCM_THREAD_DATA (thread); | |
329 | SCM_FREELIST_CREATE (scm_i_freelist); | |
330 | SCM_FREELIST_CREATE (scm_i_freelist2); | |
331 | scm_setspecific (scm_i_thread_key, t); | |
332 | scm_setspecific (scm_i_root_state_key, t->root); | |
333 | scm_i_plugin_mutex_lock (&t->heap_mutex); /* ensure that we "own" the heap */ | |
334 | init_thread_creatant (thread, base); /* must own the heap */ | |
335 | ||
d823b11b MV |
336 | data->rootcont = SCM_BOOL_F; |
337 | t->result = | |
338 | scm_internal_cwdr ((scm_t_catch_body) body_bootstrip, | |
339 | data, | |
340 | (scm_t_catch_handler) handler_bootstrip, | |
341 | data, base); | |
094b640d | 342 | scm_i_leave_guile (); /* release the heap */ |
d823b11b MV |
343 | free (data); |
344 | ||
9bc4701c MD |
345 | scm_i_plugin_mutex_lock (&thread_admin_mutex); |
346 | all_threads = scm_delq_x (thread, all_threads); | |
d823b11b MV |
347 | t->exited = 1; |
348 | thread_count--; | |
e29e0b09 | 349 | /* detach before unlocking in order to not become joined when detached */ |
c4c52ebe | 350 | scm_thread_detach (t->thread); |
e29e0b09 | 351 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); |
d823b11b MV |
352 | } |
353 | ||
9bc4701c | 354 | static void * |
d823b11b MV |
355 | launch_thread (void *p) |
356 | { | |
357 | really_launch ((SCM_STACKITEM *)&p, (launch_data *)p); | |
9bc4701c | 358 | return 0; |
d823b11b MV |
359 | } |
360 | ||
361 | static SCM | |
362 | create_thread (scm_t_catch_body body, void *body_data, | |
363 | scm_t_catch_handler handler, void *handler_data, | |
364 | SCM protects) | |
365 | { | |
366 | SCM thread; | |
367 | ||
368 | /* Make new thread. The first thing the new thread will do is to | |
369 | lock guile_mutex. Thus, we can safely complete its | |
370 | initialization after creating it. While the new thread starts, | |
371 | all its data is protected via all_threads. | |
372 | */ | |
373 | ||
374 | { | |
375 | scm_t_thread th; | |
b4debead | 376 | SCM root; |
d823b11b | 377 | launch_data *data; |
9bc4701c | 378 | scm_thread *t; |
d823b11b MV |
379 | int err; |
380 | ||
d823b11b MV |
381 | /* Allocate thread locals. */ |
382 | root = scm_make_root (scm_root->handle); | |
383 | data = scm_malloc (sizeof (launch_data)); | |
384 | ||
385 | /* Make thread. */ | |
386 | thread = make_thread (protects); | |
387 | data->thread = thread; | |
388 | data->body = body; | |
389 | data->body_data = body_data; | |
390 | data->handler = handler; | |
391 | data->handler_data = handler_data; | |
9bc4701c MD |
392 | t = SCM_THREAD_DATA (thread); |
393 | /* must initialize root state pointer before the thread is linked | |
394 | into all_threads */ | |
395 | t->root = SCM_ROOT_STATE (root); | |
0d48aca5 MD |
396 | /* disconnect from parent, to prevent remembering dead threads */ |
397 | t->root->parent = SCM_BOOL_F; | |
b4debead MD |
398 | /* start with an empty dynwind chain */ |
399 | t->root->dynwinds = SCM_EOL; | |
9bc4701c MD |
400 | |
401 | /* In order to avoid the need of synchronization between parent | |
402 | and child thread, we need to insert the child into all_threads | |
403 | before creation. */ | |
c4c52ebe MD |
404 | { |
405 | SCM new_threads = scm_cons (thread, SCM_BOOL_F); /* could cause GC */ | |
406 | scm_thread *parent = scm_i_leave_guile (); /* to prevent deadlock */ | |
407 | scm_i_plugin_mutex_lock (&thread_admin_mutex); | |
408 | SCM_SETCDR (new_threads, all_threads); | |
409 | all_threads = new_threads; | |
410 | thread_count++; | |
411 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); | |
392d2833 MD |
412 | |
413 | scm_remember_upto_here_1 (root); | |
414 | ||
c4c52ebe MD |
415 | scm_i_enter_guile (parent); |
416 | } | |
9bc4701c MD |
417 | |
418 | err = scm_i_plugin_thread_create (&th, 0, launch_thread, (void *) data); | |
419 | if (err != 0) | |
d823b11b | 420 | { |
9bc4701c MD |
421 | scm_i_plugin_mutex_lock (&thread_admin_mutex); |
422 | all_threads = scm_delq_x (thread, all_threads); | |
423 | ((scm_thread *) SCM_THREAD_DATA(thread))->exited = 1; | |
424 | thread_count--; | |
425 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 426 | } |
d823b11b | 427 | |
d823b11b MV |
428 | if (err) |
429 | { | |
430 | errno = err; | |
431 | scm_syserror ("create-thread"); | |
432 | } | |
433 | } | |
434 | ||
435 | return thread; | |
436 | } | |
437 | ||
438 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 2, 0, 0, | |
439 | (SCM thunk, SCM handler), | |
440 | "Evaluate @var{(thunk)} in a new thread, and new dynamic context, " | |
441 | "returning a new thread object representing the thread. " | |
442 | "If an error occurs during evaluation, call error-thunk, passing it an " | |
443 | "error code describing the condition. " | |
444 | "If this happens, the error-thunk is called outside the scope of the new " | |
445 | "root -- it is called in the same dynamic context in which " | |
446 | "with-new-thread was evaluated, but not in the callers thread. " | |
447 | "All the evaluation rules for dynamic roots apply to threads.") | |
448 | #define FUNC_NAME s_scm_call_with_new_thread | |
449 | { | |
450 | SCM_ASSERT (SCM_NFALSEP (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); | |
451 | SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (handler)), handler, SCM_ARG2, | |
452 | FUNC_NAME); | |
453 | ||
454 | return create_thread ((scm_t_catch_body) scm_call_0, thunk, | |
455 | (scm_t_catch_handler) scm_apply_1, handler, | |
456 | scm_cons (thunk, handler)); | |
457 | } | |
458 | #undef FUNC_NAME | |
459 | ||
29717c89 MD |
460 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
461 | (), | |
462 | "Move the calling thread to the end of the scheduling queue.") | |
463 | #define FUNC_NAME s_scm_yield | |
464 | { | |
465 | return SCM_BOOL (scm_thread_yield); | |
466 | } | |
467 | #undef FUNC_NAME | |
468 | ||
d823b11b | 469 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 470 | (SCM thread), |
d823b11b MV |
471 | "Suspend execution of the calling thread until the target @var{thread} " |
472 | "terminates, unless the target @var{thread} has already terminated. ") | |
473 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 474 | { |
d823b11b MV |
475 | scm_thread *t; |
476 | SCM res; | |
477 | ||
478 | SCM_VALIDATE_THREAD (1, thread); | |
479 | if (SCM_EQ_P (cur_thread, thread)) | |
480 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); | |
481 | ||
482 | t = SCM_THREAD_DATA (thread); | |
483 | if (!t->exited) | |
484 | { | |
0b6843b1 MD |
485 | scm_thread *c; |
486 | c = scm_i_leave_guile (); | |
9bc4701c | 487 | while (!THREAD_INITIALIZED_P (t)) |
0b6843b1 | 488 | scm_i_plugin_thread_yield (); |
9bc4701c MD |
489 | scm_thread_join (t->thread, 0); |
490 | scm_i_enter_guile (c); | |
d823b11b MV |
491 | } |
492 | res = t->result; | |
493 | t->result = SCM_BOOL_F; | |
494 | return res; | |
5f05c406 MV |
495 | } |
496 | #undef FUNC_NAME | |
497 | ||
9bc4701c | 498 | /*** Fair mutexes */ |
4079f87e | 499 | |
d823b11b MV |
500 | /* We implement our own mutex type since we want them to be 'fair', we |
501 | want to do fancy things while waiting for them (like running | |
502 | asyncs) and we want to support waiting on many things at once. | |
503 | Also, we might add things that are nice for debugging. | |
504 | */ | |
4079f87e | 505 | |
9bc4701c | 506 | typedef struct fair_mutex { |
d823b11b | 507 | /* the thread currently owning the mutex, or SCM_BOOL_F. */ |
9bc4701c MD |
508 | scm_t_mutex lock; |
509 | int lockedp; | |
d823b11b MV |
510 | SCM owner; |
511 | /* how much the owner owns us. */ | |
512 | int level; | |
513 | /* the threads waiting for this mutex. */ | |
514 | SCM waiting; | |
9bc4701c | 515 | } fair_mutex; |
5f05c406 | 516 | |
d823b11b | 517 | static SCM |
9bc4701c | 518 | fair_mutex_mark (SCM mx) |
d823b11b | 519 | { |
9bc4701c | 520 | fair_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
521 | scm_gc_mark (m->owner); |
522 | return m->waiting; | |
523 | } | |
4079f87e | 524 | |
9bc4701c | 525 | SCM_DEFINE (scm_make_fair_mutex, "make-fair-mutex", 0, 0, 0, |
d823b11b | 526 | (void), |
9bc4701c MD |
527 | "Create a new fair mutex object. ") |
528 | #define FUNC_NAME s_scm_make_fair_mutex | |
d823b11b | 529 | { |
9bc4701c MD |
530 | SCM mx = scm_make_smob (scm_tc16_fair_mutex); |
531 | fair_mutex *m = SCM_MUTEX_DATA (mx); | |
dea5539e | 532 | scm_i_plugin_mutex_init (&m->lock, &scm_i_plugin_mutex); |
9bc4701c | 533 | m->lockedp = 0; |
d823b11b MV |
534 | m->owner = SCM_BOOL_F; |
535 | m->level = 0; | |
536 | m->waiting = make_queue (); | |
537 | return mx; | |
538 | } | |
539 | #undef FUNC_NAME | |
4079f87e | 540 | |
9bc4701c MD |
541 | static int |
542 | fair_mutex_lock (fair_mutex *m) | |
d823b11b | 543 | { |
9bc4701c MD |
544 | scm_i_plugin_mutex_lock (&m->lock); |
545 | #if 0 | |
546 | /* Need to wait if another thread is just temporarily unlocking. | |
547 | This is happens very seldom and only when the other thread is | |
548 | between scm_mutex_unlock and scm_i_plugin_mutex_lock below. */ | |
549 | while (m->lockedp) | |
550 | SCM_TICK; | |
551 | m->lockedp = 1; | |
552 | #endif | |
553 | ||
d823b11b MV |
554 | if (m->owner == SCM_BOOL_F) |
555 | m->owner = cur_thread; | |
556 | else if (m->owner == cur_thread) | |
557 | m->level++; | |
558 | else | |
559 | { | |
560 | while (1) | |
561 | { | |
562 | SCM c = enqueue (m->waiting, cur_thread); | |
9bc4701c MD |
563 | int err; |
564 | /* Note: It's important that m->lock is never locked for | |
565 | any longer amount of time since that could prevent GC */ | |
566 | scm_i_plugin_mutex_unlock (&m->lock); | |
567 | err = block (); | |
d823b11b | 568 | if (m->owner == cur_thread) |
9bc4701c MD |
569 | return 0; |
570 | scm_i_plugin_mutex_lock (&m->lock); | |
d823b11b | 571 | remqueue (m->waiting, c); |
9bc4701c | 572 | scm_i_plugin_mutex_unlock (&m->lock); |
d823b11b | 573 | if (err) |
9bc4701c | 574 | return err; |
d823b11b | 575 | SCM_ASYNC_TICK; |
9bc4701c | 576 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
577 | } |
578 | } | |
9bc4701c MD |
579 | scm_i_plugin_mutex_unlock (&m->lock); |
580 | return 0; | |
d823b11b | 581 | } |
7bfd3b9e | 582 | |
9bc4701c MD |
583 | static int |
584 | fair_mutex_trylock (fair_mutex *m) | |
d823b11b | 585 | { |
9bc4701c | 586 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
587 | if (m->owner == SCM_BOOL_F) |
588 | m->owner = cur_thread; | |
589 | else if (m->owner == cur_thread) | |
590 | m->level++; | |
591 | else | |
9bc4701c MD |
592 | { |
593 | scm_i_plugin_mutex_unlock (&m->lock); | |
594 | return EBUSY; | |
595 | } | |
596 | scm_i_plugin_mutex_unlock (&m->lock); | |
597 | return 0; | |
d823b11b | 598 | } |
d823b11b | 599 | |
9bc4701c MD |
600 | static int |
601 | fair_mutex_unlock (fair_mutex *m) | |
5f05c406 | 602 | { |
9bc4701c | 603 | scm_i_plugin_mutex_lock (&m->lock); |
d823b11b MV |
604 | if (m->owner != cur_thread) |
605 | { | |
9bc4701c MD |
606 | scm_i_plugin_mutex_unlock (&m->lock); |
607 | return EPERM; | |
d823b11b MV |
608 | } |
609 | else if (m->level > 0) | |
610 | m->level--; | |
611 | else | |
612 | { | |
613 | SCM next = dequeue (m->waiting); | |
614 | if (!SCM_FALSEP (next)) | |
615 | { | |
616 | m->owner = next; | |
617 | unblock (SCM_THREAD_DATA (next)); | |
d823b11b MV |
618 | } |
619 | else | |
620 | m->owner = SCM_BOOL_F; | |
621 | } | |
9bc4701c MD |
622 | scm_i_plugin_mutex_unlock (&m->lock); |
623 | return 0; | |
5f05c406 MV |
624 | } |
625 | ||
9bc4701c | 626 | /*** Fair condition variables */ |
7bfd3b9e | 627 | |
d823b11b MV |
628 | /* Like mutexes, we implement our own condition variables using the |
629 | primitives above. | |
630 | */ | |
5f05c406 | 631 | |
9bc4701c MD |
632 | typedef struct fair_cond { |
633 | scm_t_mutex lock; | |
d823b11b MV |
634 | /* the threads waiting for this condition. */ |
635 | SCM waiting; | |
9bc4701c | 636 | } fair_cond; |
5f05c406 | 637 | |
d823b11b | 638 | static SCM |
9bc4701c | 639 | fair_cond_mark (SCM cv) |
5f05c406 | 640 | { |
9bc4701c | 641 | fair_cond *c = SCM_CONDVAR_DATA (cv); |
d823b11b | 642 | return c->waiting; |
5f05c406 MV |
643 | } |
644 | ||
9bc4701c MD |
645 | SCM_DEFINE (scm_make_fair_condition_variable, "make-fair-condition-variable", 0, 0, 0, |
646 | (void), | |
647 | "Make a new fair condition variable.") | |
648 | #define FUNC_NAME s_scm_make_fair_condition_variable | |
649 | { | |
650 | SCM cv = scm_make_smob (scm_tc16_fair_condvar); | |
651 | fair_cond *c = SCM_CONDVAR_DATA (cv); | |
652 | scm_i_plugin_mutex_init (&c->lock, 0); | |
653 | c->waiting = make_queue (); | |
654 | return cv; | |
655 | } | |
656 | #undef FUNC_NAME | |
657 | ||
658 | static int | |
659 | fair_cond_timedwait (fair_cond *c, | |
660 | fair_mutex *m, | |
661 | const struct timespec *waittime) | |
662 | { | |
663 | int err; | |
664 | scm_i_plugin_mutex_lock (&c->lock); | |
665 | ||
666 | while (1) | |
667 | { | |
668 | enqueue (c->waiting, cur_thread); | |
669 | scm_i_plugin_mutex_unlock (&c->lock); | |
670 | fair_mutex_unlock (m); /*fixme* - not thread safe */ | |
671 | if (waittime == NULL) | |
672 | err = block (); | |
673 | else | |
674 | err = timed_block (waittime); | |
675 | fair_mutex_lock (m); | |
676 | if (err) | |
677 | return err; | |
678 | /* XXX - check whether we have been signalled. */ | |
679 | break; | |
680 | } | |
681 | return err; | |
682 | } | |
683 | ||
684 | static int | |
685 | fair_cond_signal (fair_cond *c) | |
686 | { | |
687 | SCM th; | |
688 | scm_i_plugin_mutex_lock (&c->lock); | |
689 | if (!SCM_FALSEP (th = dequeue (c->waiting))) | |
690 | unblock (SCM_THREAD_DATA (th)); | |
691 | scm_i_plugin_mutex_unlock (&c->lock); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static int | |
696 | fair_cond_broadcast (fair_cond *c) | |
697 | { | |
698 | SCM th; | |
699 | scm_i_plugin_mutex_lock (&c->lock); | |
700 | while (!SCM_FALSEP (th = dequeue (c->waiting))) | |
701 | unblock (SCM_THREAD_DATA (th)); | |
702 | scm_i_plugin_mutex_unlock (&c->lock); | |
703 | return 0; | |
704 | } | |
705 | ||
706 | /*** Mutexes */ | |
707 | ||
708 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, | |
709 | (void), | |
710 | "Create a new mutex object. ") | |
711 | #define FUNC_NAME s_scm_make_mutex | |
712 | { | |
713 | SCM mx = scm_make_smob (scm_tc16_mutex); | |
dea5539e | 714 | scm_i_plugin_mutex_init (SCM_MUTEX_DATA (mx), &scm_i_plugin_mutex); |
9bc4701c MD |
715 | return mx; |
716 | } | |
717 | #undef FUNC_NAME | |
718 | ||
719 | /*fixme* change documentation */ | |
720 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, | |
721 | (SCM mx), | |
722 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
723 | "blocks until the mutex becomes available. The function returns when " | |
724 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
725 | "a thread already owns will succeed right away and will not block the " | |
726 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
727 | #define FUNC_NAME s_scm_lock_mutex | |
728 | { | |
729 | int err; | |
730 | SCM_VALIDATE_MUTEX (1, mx); | |
731 | ||
732 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
733 | err = fair_mutex_lock (SCM_MUTEX_DATA (mx)); | |
734 | else | |
735 | { | |
736 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
0b6843b1 | 737 | err = scm_mutex_lock (m); |
9bc4701c MD |
738 | } |
739 | ||
740 | if (err) | |
741 | { | |
742 | errno = err; | |
743 | SCM_SYSERROR; | |
744 | } | |
745 | return SCM_BOOL_T; | |
746 | } | |
747 | #undef FUNC_NAME | |
748 | ||
749 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, | |
750 | (SCM mx), | |
751 | "Try to lock @var{mutex}. If the mutex is already locked by someone " | |
752 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
753 | #define FUNC_NAME s_scm_try_mutex | |
754 | { | |
755 | int err; | |
756 | SCM_VALIDATE_MUTEX (1, mx); | |
757 | ||
758 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
759 | err = fair_mutex_trylock (SCM_MUTEX_DATA (mx)); | |
760 | else | |
761 | { | |
762 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
0b6843b1 | 763 | err = scm_mutex_trylock (m); |
9bc4701c MD |
764 | } |
765 | ||
766 | if (err == EBUSY) | |
767 | return SCM_BOOL_F; | |
768 | ||
769 | if (err) | |
770 | { | |
771 | errno = err; | |
772 | SCM_SYSERROR; | |
773 | } | |
774 | ||
775 | return SCM_BOOL_T; | |
776 | } | |
777 | #undef FUNC_NAME | |
778 | ||
779 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
780 | (SCM mx), | |
781 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
782 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
783 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
784 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
785 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
786 | "with a call to @code{unlock-mutex}. Only the last call to " | |
787 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
788 | #define FUNC_NAME s_scm_unlock_mutex | |
789 | { | |
790 | int err; | |
791 | SCM_VALIDATE_MUTEX (1, mx); | |
792 | ||
793 | if (SCM_TYP16 (mx) == scm_tc16_fair_mutex) | |
794 | { | |
795 | err = fair_mutex_unlock (SCM_MUTEX_DATA (mx)); | |
796 | if (err == EPERM) | |
797 | { | |
798 | fair_mutex *m = SCM_MUTEX_DATA (mx); | |
799 | if (m->owner != cur_thread) | |
800 | { | |
801 | if (m->owner == SCM_BOOL_F) | |
802 | SCM_MISC_ERROR ("mutex not locked", SCM_EOL); | |
803 | else | |
804 | SCM_MISC_ERROR ("mutex not locked by this thread", SCM_EOL); | |
805 | } | |
806 | } | |
807 | } | |
808 | else | |
809 | { | |
810 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
0b6843b1 | 811 | err = scm_mutex_unlock (m); |
9bc4701c MD |
812 | } |
813 | ||
814 | if (err) | |
815 | { | |
816 | errno = err; | |
817 | SCM_SYSERROR; | |
818 | } | |
819 | return SCM_BOOL_T; | |
820 | } | |
821 | #undef FUNC_NAME | |
822 | ||
823 | /*** Condition variables */ | |
824 | ||
d823b11b MV |
825 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
826 | (void), | |
827 | "Make a new condition variable.") | |
828 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 829 | { |
d823b11b | 830 | SCM cv = scm_make_smob (scm_tc16_condvar); |
9bc4701c | 831 | scm_i_plugin_cond_init (SCM_CONDVAR_DATA (cv), 0); |
d823b11b | 832 | return cv; |
5f05c406 | 833 | } |
d823b11b | 834 | #undef FUNC_NAME |
5f05c406 | 835 | |
d823b11b MV |
836 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
837 | (SCM cv, SCM mx, SCM t), | |
838 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
839 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
840 | "is locked again when this function returns. When @var{time} is given, " | |
841 | "it specifies a point in time where the waiting should be aborted. It " | |
842 | "can be either a integer as returned by @code{current-time} or a pair " | |
843 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
844 | "mutex is locked and @code{#f} is returned. When the condition " | |
845 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
846 | "is returned. ") | |
847 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 848 | { |
d823b11b MV |
849 | struct timespec waittime; |
850 | int err; | |
851 | ||
852 | SCM_VALIDATE_CONDVAR (1, cv); | |
853 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c MD |
854 | if (!((SCM_TYP16 (cv) == scm_tc16_condvar |
855 | && SCM_TYP16 (mx) == scm_tc16_mutex) | |
856 | || (SCM_TYP16 (cv) == scm_tc16_fair_condvar | |
857 | && SCM_TYP16 (mx) == scm_tc16_fair_mutex))) | |
858 | SCM_MISC_ERROR ("Condition variable and mutex are of different kinds.", | |
859 | SCM_EOL); | |
860 | ||
d823b11b MV |
861 | if (!SCM_UNBNDP (t)) |
862 | { | |
863 | if (SCM_CONSP (t)) | |
864 | { | |
9bc4701c MD |
865 | SCM_VALIDATE_UINT_COPY (3, SCM_CAR (t), waittime.tv_sec); |
866 | SCM_VALIDATE_UINT_COPY (3, SCM_CDR (t), waittime.tv_nsec); | |
d823b11b MV |
867 | waittime.tv_nsec *= 1000; |
868 | } | |
869 | else | |
870 | { | |
871 | SCM_VALIDATE_UINT_COPY (3, t, waittime.tv_sec); | |
872 | waittime.tv_nsec = 0; | |
873 | } | |
874 | } | |
875 | ||
9bc4701c MD |
876 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
877 | err = fair_cond_timedwait (SCM_CONDVAR_DATA (cv), | |
878 | SCM_MUTEX_DATA (mx), | |
879 | SCM_UNBNDP (t) ? NULL : &waittime); | |
880 | else | |
881 | { | |
882 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
883 | scm_t_mutex *m = SCM_MUTEX_DATA (mx); | |
41c96c32 MD |
884 | if (SCM_UNBNDP (t)) |
885 | err = scm_cond_wait (c, m); | |
886 | else | |
887 | err = scm_cond_timedwait (c, m, &waittime); | |
9bc4701c | 888 | } |
d823b11b | 889 | |
9bc4701c | 890 | if (err) |
d823b11b | 891 | { |
41c96c32 MD |
892 | if (err == ETIMEDOUT) |
893 | return SCM_BOOL_F; | |
9bc4701c MD |
894 | errno = err; |
895 | SCM_SYSERROR; | |
d823b11b | 896 | } |
9bc4701c | 897 | return SCM_BOOL_T; |
5f05c406 | 898 | } |
d823b11b | 899 | #undef FUNC_NAME |
5f05c406 | 900 | |
d823b11b MV |
901 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
902 | (SCM cv), | |
903 | "Wake up one thread that is waiting for @var{cv}") | |
904 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 905 | { |
d823b11b | 906 | SCM_VALIDATE_CONDVAR (1, cv); |
9bc4701c MD |
907 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
908 | fair_cond_signal (SCM_CONDVAR_DATA (cv)); | |
909 | else | |
910 | { | |
911 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
0b6843b1 | 912 | scm_cond_signal (c); |
9bc4701c | 913 | } |
d823b11b | 914 | return SCM_BOOL_T; |
5f05c406 | 915 | } |
d823b11b | 916 | #undef FUNC_NAME |
5f05c406 | 917 | |
d823b11b MV |
918 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
919 | (SCM cv), | |
920 | "Wake up all threads that are waiting for @var{cv}. ") | |
921 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 922 | { |
d823b11b | 923 | SCM_VALIDATE_CONDVAR (1, cv); |
9bc4701c MD |
924 | if (SCM_TYP16 (cv) == scm_tc16_fair_condvar) |
925 | fair_cond_broadcast (SCM_CONDVAR_DATA (cv)); | |
926 | else | |
927 | { | |
928 | scm_t_cond *c = SCM_CONDVAR_DATA (cv); | |
0b6843b1 | 929 | scm_cond_broadcast (c); |
9bc4701c | 930 | } |
d823b11b | 931 | return SCM_BOOL_T; |
5f05c406 | 932 | } |
d823b11b | 933 | #undef FUNC_NAME |
5f05c406 | 934 | |
d823b11b MV |
935 | /*** Marking stacks */ |
936 | ||
937 | /* XXX - what to do with this? Do we need to handle this for blocked | |
938 | threads as well? | |
939 | */ | |
940 | #ifdef __ia64__ | |
941 | # define SCM_MARK_BACKING_STORE() do { \ | |
942 | ucontext_t ctx; \ | |
943 | SCM_STACKITEM * top, * bot; \ | |
944 | getcontext (&ctx); \ | |
945 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
946 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
947 | / sizeof (SCM_STACKITEM))); \ | |
948 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
949 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
950 | scm_mark_locations (bot, top - bot); } while (0) | |
951 | #else | |
952 | # define SCM_MARK_BACKING_STORE() | |
953 | #endif | |
954 | ||
955 | void | |
956 | scm_threads_mark_stacks (void) | |
5f05c406 | 957 | { |
d823b11b MV |
958 | volatile SCM c; |
959 | for (c = all_threads; !SCM_NULLP (c); c = SCM_CDR (c)) | |
960 | { | |
961 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (c)); | |
9bc4701c | 962 | if (!THREAD_INITIALIZED_P (t)) |
d823b11b MV |
963 | { |
964 | /* Not fully initialized yet. */ | |
965 | continue; | |
966 | } | |
967 | if (t->top == NULL) | |
968 | { | |
9bc4701c MD |
969 | long stack_len; |
970 | #ifdef SCM_DEBUG | |
971 | if (t->thread != scm_thread_self ()) | |
972 | abort (); | |
973 | #endif | |
d823b11b MV |
974 | /* Active thread */ |
975 | /* stack_len is long rather than sizet in order to guarantee | |
976 | that &stack_len is long aligned */ | |
977 | #ifdef STACK_GROWS_UP | |
9bc4701c MD |
978 | stack_len = ((SCM_STACKITEM *) (&t) - |
979 | (SCM_STACKITEM *) thread->base); | |
d823b11b MV |
980 | |
981 | /* Protect from the C stack. This must be the first marking | |
982 | * done because it provides information about what objects | |
983 | * are "in-use" by the C code. "in-use" objects are those | |
984 | * for which the information about length and base address must | |
985 | * remain usable. This requirement is stricter than a liveness | |
986 | * requirement -- in particular, it constrains the implementation | |
987 | * of scm_resizuve. | |
988 | */ | |
989 | SCM_FLUSH_REGISTER_WINDOWS; | |
990 | /* This assumes that all registers are saved into the jmp_buf */ | |
991 | setjmp (scm_save_regs_gc_mark); | |
992 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
993 | ((size_t) sizeof scm_save_regs_gc_mark | |
994 | / sizeof (SCM_STACKITEM))); | |
995 | ||
996 | scm_mark_locations (((size_t) t->base, | |
997 | (sizet) stack_len)); | |
998 | #else | |
9bc4701c MD |
999 | stack_len = ((SCM_STACKITEM *) t->base - |
1000 | (SCM_STACKITEM *) (&t)); | |
d823b11b MV |
1001 | |
1002 | /* Protect from the C stack. This must be the first marking | |
1003 | * done because it provides information about what objects | |
1004 | * are "in-use" by the C code. "in-use" objects are those | |
1005 | * for which the information about length and base address must | |
1006 | * remain usable. This requirement is stricter than a liveness | |
1007 | * requirement -- in particular, it constrains the implementation | |
1008 | * of scm_resizuve. | |
1009 | */ | |
1010 | SCM_FLUSH_REGISTER_WINDOWS; | |
1011 | /* This assumes that all registers are saved into the jmp_buf */ | |
1012 | setjmp (scm_save_regs_gc_mark); | |
1013 | scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark, | |
1014 | ((size_t) sizeof scm_save_regs_gc_mark | |
1015 | / sizeof (SCM_STACKITEM))); | |
1016 | ||
1017 | scm_mark_locations ((SCM_STACKITEM *) &t, | |
1018 | stack_len); | |
1019 | #endif | |
1020 | } | |
1021 | else | |
1022 | { | |
1023 | /* Suspended thread */ | |
1024 | #ifdef STACK_GROWS_UP | |
1025 | long stack_len = t->top - t->base; | |
1026 | scm_mark_locations (t->base, stack_len); | |
1027 | #else | |
1028 | long stack_len = t->base - t->top; | |
1029 | scm_mark_locations (t->top, stack_len); | |
1030 | #endif | |
1031 | scm_mark_locations ((SCM_STACKITEM *) t->regs, | |
1032 | ((size_t) sizeof(t->regs) | |
1033 | / sizeof (SCM_STACKITEM))); | |
1034 | } | |
1035 | } | |
5f05c406 MV |
1036 | } |
1037 | ||
d823b11b MV |
1038 | /*** Select */ |
1039 | ||
911782b7 | 1040 | int |
d823b11b MV |
1041 | scm_internal_select (int nfds, |
1042 | SELECT_TYPE *readfds, | |
1043 | SELECT_TYPE *writefds, | |
1044 | SELECT_TYPE *exceptfds, | |
1045 | struct timeval *timeout) | |
5f05c406 | 1046 | { |
d823b11b | 1047 | int res, eno; |
9bc4701c MD |
1048 | scm_thread *c = scm_i_leave_guile (); |
1049 | res = scm_i_plugin_select (nfds, readfds, writefds, exceptfds, timeout); | |
d823b11b | 1050 | eno = errno; |
9bc4701c | 1051 | scm_i_enter_guile (c); |
d823b11b MV |
1052 | SCM_ASYNC_TICK; |
1053 | errno = eno; | |
1054 | return res; | |
5f05c406 MV |
1055 | } |
1056 | ||
9bc4701c MD |
1057 | /* Low-level C API */ |
1058 | ||
1059 | SCM | |
1060 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1061 | scm_t_catch_handler handler, void *handler_data) | |
1062 | { | |
1063 | return create_thread (body, body_data, handler, handler_data, SCM_BOOL_F); | |
1064 | } | |
1065 | ||
9bc4701c MD |
1066 | int |
1067 | scm_mutex_lock (scm_t_mutex *m) | |
1068 | { | |
1069 | scm_thread *t = scm_i_leave_guile (); | |
1070 | int res = scm_i_plugin_mutex_lock (m); | |
1071 | scm_i_enter_guile (t); | |
1072 | return res; | |
1073 | } | |
1074 | ||
28d52ebb MD |
1075 | scm_t_rec_mutex * |
1076 | scm_make_rec_mutex () | |
1077 | { | |
1078 | scm_t_rec_mutex *m = scm_malloc (sizeof (scm_t_rec_mutex)); | |
1079 | scm_i_plugin_rec_mutex_init (m, &scm_i_plugin_rec_mutex); | |
1080 | return m; | |
1081 | } | |
1082 | ||
1083 | void | |
1084 | scm_rec_mutex_free (scm_t_rec_mutex *m) | |
1085 | { | |
1086 | scm_i_plugin_rec_mutex_destroy (m); | |
1087 | free (m); | |
1088 | } | |
1089 | ||
1090 | int | |
1091 | scm_rec_mutex_lock (scm_t_rec_mutex *m) | |
1092 | { | |
1093 | scm_thread *t = scm_i_leave_guile (); | |
1094 | int res = scm_i_plugin_rec_mutex_lock (m); | |
1095 | scm_i_enter_guile (t); | |
1096 | return res; | |
1097 | } | |
1098 | ||
9bc4701c MD |
1099 | int |
1100 | scm_cond_wait (scm_t_cond *c, scm_t_mutex *m) | |
1101 | { | |
1102 | scm_thread *t = scm_i_leave_guile (); | |
1103 | scm_i_plugin_cond_wait (c, m); | |
1104 | scm_i_enter_guile (t); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | int | |
06babecc | 1109 | scm_cond_timedwait (scm_t_cond *c, scm_t_mutex *m, const struct timespec *wt) |
9bc4701c MD |
1110 | { |
1111 | scm_thread *t = scm_i_leave_guile (); | |
06babecc | 1112 | int res = scm_i_plugin_cond_timedwait (c, m, wt); |
9bc4701c MD |
1113 | scm_i_enter_guile (t); |
1114 | return res; | |
1115 | } | |
9bc4701c MD |
1116 | |
1117 | void | |
1118 | scm_enter_guile () | |
1119 | { | |
1120 | scm_i_enter_guile (SCM_CURRENT_THREAD); | |
1121 | } | |
1122 | ||
1123 | void | |
1124 | scm_leave_guile () | |
1125 | { | |
1126 | scm_i_leave_guile (); | |
1127 | } | |
1128 | ||
d823b11b MV |
1129 | unsigned long |
1130 | scm_thread_usleep (unsigned long usecs) | |
5f05c406 | 1131 | { |
d823b11b MV |
1132 | struct timeval tv; |
1133 | tv.tv_usec = usecs % 1000000; | |
1134 | tv.tv_sec = usecs / 1000000; | |
1135 | scm_internal_select (0, NULL, NULL, NULL, &tv); | |
1136 | return tv.tv_usec + tv.tv_sec*1000000; | |
5f05c406 MV |
1137 | } |
1138 | ||
d823b11b MV |
1139 | unsigned long |
1140 | scm_thread_sleep (unsigned long secs) | |
6c214b62 | 1141 | { |
d823b11b MV |
1142 | struct timeval tv; |
1143 | tv.tv_usec = 0; | |
1144 | tv.tv_sec = secs; | |
1145 | scm_internal_select (0, NULL, NULL, NULL, &tv); | |
1146 | return tv.tv_sec; | |
6c214b62 MD |
1147 | } |
1148 | ||
d823b11b MV |
1149 | /*** Misc */ |
1150 | ||
1151 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1152 | (void), | |
1153 | "Return the thread that called this function.") | |
1154 | #define FUNC_NAME s_scm_current_thread | |
1155 | { | |
1156 | return cur_thread; | |
1157 | } | |
1158 | #undef FUNC_NAME | |
1159 | ||
1160 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, | |
1161 | (void), | |
1162 | "Return a list of all threads.") | |
9bc4701c | 1163 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1164 | { |
0b6843b1 | 1165 | return scm_list_copy (all_threads); |
d823b11b MV |
1166 | } |
1167 | #undef FUNC_NAME | |
1168 | ||
1169 | scm_root_state * | |
1170 | scm_i_thread_root (SCM thread) | |
1171 | { | |
9bc4701c | 1172 | return ((scm_thread *) SCM_THREAD_DATA (thread))->root; |
d823b11b MV |
1173 | } |
1174 | ||
1175 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1176 | (SCM thread), | |
1177 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1178 | #define FUNC_NAME s_scm_thread_exited_p | |
1179 | { | |
1180 | return SCM_BOOL (scm_c_thread_exited_p (thread)); | |
1181 | } | |
1182 | #undef FUNC_NAME | |
1183 | ||
911782b7 | 1184 | int |
d823b11b MV |
1185 | scm_c_thread_exited_p (SCM thread) |
1186 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1187 | { |
d823b11b MV |
1188 | scm_thread *t; |
1189 | SCM_VALIDATE_THREAD (1, thread); | |
1190 | t = SCM_THREAD_DATA (thread); | |
1191 | return t->exited; | |
5f05c406 | 1192 | } |
d823b11b | 1193 | #undef FUNC_NAME |
5f05c406 | 1194 | |
9bc4701c MD |
1195 | static scm_t_cond wake_up_cond; |
1196 | int scm_i_thread_go_to_sleep; | |
9bc4701c MD |
1197 | static int gc_section_count = 0; |
1198 | static int threads_initialized_p = 0; | |
1199 | ||
1200 | void | |
1201 | scm_i_thread_put_to_sleep () | |
1202 | { | |
28d52ebb | 1203 | if (threads_initialized_p && !gc_section_count++) |
9bc4701c | 1204 | { |
c4c52ebe MD |
1205 | SCM threads; |
1206 | scm_i_plugin_mutex_lock (&thread_admin_mutex); | |
1207 | threads = all_threads; | |
9bc4701c MD |
1208 | /* Signal all threads to go to sleep */ |
1209 | scm_i_thread_go_to_sleep = 1; | |
1210 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1211 | if (SCM_CAR (threads) != cur_thread) | |
1212 | { | |
1213 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
9bc4701c MD |
1214 | scm_i_plugin_mutex_lock (&t->heap_mutex); |
1215 | } | |
9bc4701c MD |
1216 | scm_i_thread_go_to_sleep = 0; |
1217 | } | |
1218 | } | |
1219 | ||
b0dc3d71 MD |
1220 | void |
1221 | scm_i_thread_invalidate_freelists () | |
1222 | { | |
e29e0b09 | 1223 | /* Don't need to lock thread_admin_mutex here since we are single threaded */ |
b0dc3d71 MD |
1224 | SCM threads = all_threads; |
1225 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1226 | if (SCM_CAR (threads) != cur_thread) | |
1227 | { | |
1228 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
1229 | t->clear_freelists_p = 1; | |
1230 | } | |
1231 | } | |
1232 | ||
9bc4701c MD |
1233 | void |
1234 | scm_i_thread_wake_up () | |
1235 | { | |
28d52ebb | 1236 | if (threads_initialized_p && !--gc_section_count) |
9bc4701c | 1237 | { |
c4c52ebe | 1238 | SCM threads; |
c4c52ebe | 1239 | threads = all_threads; |
9bc4701c MD |
1240 | scm_i_plugin_cond_broadcast (&wake_up_cond); |
1241 | for (; !SCM_NULLP (threads); threads = SCM_CDR (threads)) | |
1242 | if (SCM_CAR (threads) != cur_thread) | |
1243 | { | |
1244 | scm_thread *t = SCM_THREAD_DATA (SCM_CAR (threads)); | |
1245 | scm_i_plugin_mutex_unlock (&t->heap_mutex); | |
1246 | } | |
c4c52ebe | 1247 | scm_i_plugin_mutex_unlock (&thread_admin_mutex); |
9bc4701c | 1248 | } |
9bc4701c MD |
1249 | } |
1250 | ||
1251 | void | |
1252 | scm_i_thread_sleep_for_gc () | |
1253 | { | |
1254 | scm_thread *t; | |
1255 | t = suspend (); | |
9bc4701c | 1256 | scm_i_plugin_cond_wait (&wake_up_cond, &t->heap_mutex); |
b0dc3d71 | 1257 | resume (t); |
9bc4701c MD |
1258 | } |
1259 | ||
9bc4701c | 1260 | scm_t_mutex scm_i_critical_section_mutex; |
28d52ebb MD |
1261 | scm_t_rec_mutex scm_i_defer_mutex; |
1262 | ||
1263 | #ifdef USE_PTHREAD_THREADS | |
1264 | #include "libguile/pthread-threads.c" | |
1265 | #endif | |
29717c89 | 1266 | #include "libguile/threads-plugin.c" |
9bc4701c | 1267 | |
d823b11b | 1268 | /*** Initialization */ |
7bfd3b9e | 1269 | |
9bc4701c MD |
1270 | void |
1271 | scm_threads_prehistory () | |
1272 | { | |
1273 | scm_thread *t; | |
93cd4dcd MD |
1274 | #ifdef USE_PTHREAD_THREADS |
1275 | /* Must be called before any initialization of a mutex. */ | |
1276 | scm_init_pthread_threads (); | |
1277 | #endif | |
28d52ebb | 1278 | scm_i_plugin_mutex_init (&thread_admin_mutex, &scm_i_plugin_mutex); |
9bc4701c | 1279 | scm_i_plugin_cond_init (&wake_up_cond, 0); |
28d52ebb | 1280 | scm_i_plugin_mutex_init (&scm_i_critical_section_mutex, &scm_i_plugin_mutex); |
9bc4701c MD |
1281 | thread_count = 1; |
1282 | scm_i_plugin_key_create (&scm_i_thread_key, 0); | |
1283 | scm_i_plugin_key_create (&scm_i_root_state_key, 0); | |
28d52ebb | 1284 | scm_i_plugin_rec_mutex_init (&scm_i_defer_mutex, &scm_i_plugin_rec_mutex); |
9bc4701c MD |
1285 | /* Allocate a fake thread object to be used during bootup. */ |
1286 | t = malloc (sizeof (scm_thread)); | |
1287 | t->base = NULL; | |
1288 | t->clear_freelists_p = 0; | |
0b6843b1 | 1289 | scm_i_plugin_mutex_init (&t->heap_mutex, &scm_i_plugin_mutex); |
9bc4701c | 1290 | scm_setspecific (scm_i_thread_key, t); |
0b6843b1 | 1291 | scm_i_enter_guile (t); |
9bc4701c MD |
1292 | } |
1293 | ||
d823b11b | 1294 | scm_t_bits scm_tc16_thread; |
28d52ebb | 1295 | scm_t_bits scm_tc16_future; |
d823b11b | 1296 | scm_t_bits scm_tc16_mutex; |
9bc4701c | 1297 | scm_t_bits scm_tc16_fair_mutex; |
d823b11b | 1298 | scm_t_bits scm_tc16_condvar; |
9bc4701c | 1299 | scm_t_bits scm_tc16_fair_condvar; |
7bfd3b9e | 1300 | |
7bfd3b9e | 1301 | void |
d823b11b | 1302 | scm_init_threads (SCM_STACKITEM *base) |
7bfd3b9e | 1303 | { |
9bc4701c | 1304 | SCM thread; |
d823b11b | 1305 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_thread)); |
9bc4701c MD |
1306 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (scm_t_mutex)); |
1307 | scm_tc16_fair_mutex = scm_make_smob_type ("fair-mutex", | |
1308 | sizeof (fair_mutex)); | |
d823b11b | 1309 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
9bc4701c MD |
1310 | sizeof (scm_t_cond)); |
1311 | scm_tc16_fair_condvar = scm_make_smob_type ("fair-condition-variable", | |
1312 | sizeof (fair_cond)); | |
d823b11b | 1313 | |
9bc4701c MD |
1314 | thread = make_thread (SCM_BOOL_F); |
1315 | /* Replace initial fake thread with a real thread object */ | |
1316 | free (SCM_CURRENT_THREAD); | |
1317 | scm_setspecific (scm_i_thread_key, SCM_THREAD_DATA (thread)); | |
1318 | scm_i_enter_guile (SCM_CURRENT_THREAD); | |
d823b11b | 1319 | |
d823b11b | 1320 | /* root is set later from init.c */ |
9bc4701c | 1321 | init_thread_creatant (thread, base); |
d823b11b MV |
1322 | thread_count = 1; |
1323 | scm_gc_register_root (&all_threads); | |
9bc4701c | 1324 | all_threads = scm_cons (thread, SCM_EOL); |
d823b11b MV |
1325 | |
1326 | scm_set_smob_mark (scm_tc16_thread, thread_mark); | |
1327 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
1328 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
1329 | ||
9bc4701c MD |
1330 | scm_set_smob_mark (scm_tc16_fair_mutex, fair_mutex_mark); |
1331 | ||
1332 | scm_set_smob_mark (scm_tc16_fair_condvar, fair_cond_mark); | |
d823b11b | 1333 | |
9bc4701c | 1334 | threads_initialized_p = 1; |
7bfd3b9e | 1335 | } |
89e00824 | 1336 | |
5f05c406 MV |
1337 | void |
1338 | scm_init_thread_procs () | |
1339 | { | |
1340 | #include "libguile/threads.x" | |
1341 | } | |
1342 | ||
d823b11b MV |
1343 | /* XXX */ |
1344 | ||
1345 | void | |
1346 | scm_init_iselect () | |
1347 | { | |
1348 | } | |
1349 | ||
89e00824 ML |
1350 | /* |
1351 | Local Variables: | |
1352 | c-file-style: "gnu" | |
1353 | End: | |
1354 | */ |