Commit | Line | Data |
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b3da54d1 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, |
aef1fcf9 | 2 | * 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 |
b3da54d1 | 3 | * Free Software Foundation, Inc. |
74926120 | 4 | * |
73be1d9e | 5 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
6 | * modify it under the terms of the GNU Lesser General Public License |
7 | * as published by the Free Software Foundation; either version 3 of | |
8 | * the License, or (at your option) any later version. | |
7bfd3b9e | 9 | * |
53befeb7 NJ |
10 | * This library is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * Lesser General Public License for more details. | |
7bfd3b9e | 14 | * |
73be1d9e MV |
15 | * You should have received a copy of the GNU Lesser General Public |
16 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
18 | * 02110-1301 USA | |
73be1d9e | 19 | */ |
1bbd0b84 | 20 | |
1bbd0b84 | 21 | |
7bfd3b9e | 22 | \f |
dbb605f5 LC |
23 | #ifdef HAVE_CONFIG_H |
24 | # include <config.h> | |
25 | #endif | |
7bfd3b9e | 26 | |
1c44468d | 27 | #include "libguile/bdw-gc.h" |
7af0c3b3 | 28 | #include <gc/gc_mark.h> |
1810dc4e RB |
29 | #include "libguile/_scm.h" |
30 | ||
b3da54d1 | 31 | #include <stdlib.h> |
fcc5d734 | 32 | #if HAVE_UNISTD_H |
d823b11b | 33 | #include <unistd.h> |
fcc5d734 | 34 | #endif |
d823b11b | 35 | #include <stdio.h> |
8ab3d8a0 KR |
36 | |
37 | #ifdef HAVE_STRING_H | |
38 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
39 | #endif | |
40 | ||
fcc5d734 | 41 | #if HAVE_SYS_TIME_H |
d823b11b | 42 | #include <sys/time.h> |
fcc5d734 | 43 | #endif |
5f05c406 | 44 | |
c1d5d6d7 AW |
45 | #if HAVE_PTHREAD_NP_H |
46 | # include <pthread_np.h> | |
47 | #endif | |
48 | ||
6ab4de61 AW |
49 | #include <sys/select.h> |
50 | ||
f57fdf07 | 51 | #include <assert.h> |
32f94bf2 | 52 | #include <fcntl.h> |
d20912e6 | 53 | #include <nproc.h> |
f57fdf07 | 54 | |
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" |
9de87eea MV |
63 | #include "libguile/fluids.h" |
64 | #include "libguile/continuations.h" | |
2b829bbb | 65 | #include "libguile/gc.h" |
aef1fcf9 | 66 | #include "libguile/gc-inline.h" |
9de87eea | 67 | #include "libguile/init.h" |
2e77f720 | 68 | #include "libguile/scmsigs.h" |
6180e336 | 69 | #include "libguile/strings.h" |
5f18bc84 | 70 | #include "libguile/vm.h" |
7bfd3b9e | 71 | |
634aa8de LC |
72 | #include <full-read.h> |
73 | ||
cde24ce1 AW |
74 | |
75 | \f | |
7af0c3b3 AW |
76 | |
77 | /* The GC "kind" for threads that allow them to mark their VM | |
78 | stacks. */ | |
79 | static int thread_gc_kind; | |
80 | ||
81 | static struct GC_ms_entry * | |
82 | thread_mark (GC_word *addr, struct GC_ms_entry *mark_stack_ptr, | |
83 | struct GC_ms_entry *mark_stack_limit, GC_word env) | |
84 | { | |
85 | int word; | |
86 | const struct scm_i_thread *t = (struct scm_i_thread *) addr; | |
87 | ||
88 | if (SCM_UNPACK (t->handle) == 0) | |
89 | /* T must be on the free-list; ignore. (See warning in | |
90 | gc_mark.h.) */ | |
91 | return mark_stack_ptr; | |
92 | ||
5f18bc84 | 93 | /* Mark T. We could be more precise, but it doesn't matter. */ |
7af0c3b3 AW |
94 | for (word = 0; word * sizeof (*addr) < sizeof (*t); word++) |
95 | mark_stack_ptr = GC_MARK_AND_PUSH ((void *) addr[word], | |
96 | mark_stack_ptr, mark_stack_limit, | |
97 | NULL); | |
98 | ||
aef1fcf9 AW |
99 | /* The pointerless freelists are threaded through their first word, |
100 | but GC doesn't know to trace them (as they are pointerless), so we | |
101 | need to do that here. See the comments at the top of libgc's | |
102 | gc_inline.h. */ | |
103 | { | |
104 | size_t n; | |
105 | for (n = 0; n < SCM_INLINE_GC_FREELIST_COUNT; n++) | |
106 | { | |
107 | void *chain = t->pointerless_freelists[n]; | |
108 | if (chain) | |
109 | { | |
110 | /* The first link is already marked by the freelist vector, | |
111 | so we just have to mark the tail. */ | |
112 | while ((chain = *(void **)chain)) | |
113 | mark_stack_ptr = GC_mark_and_push (chain, mark_stack_ptr, | |
114 | mark_stack_limit, NULL); | |
115 | } | |
116 | } | |
117 | } | |
118 | ||
5f18bc84 AW |
119 | if (t->vp) |
120 | mark_stack_ptr = scm_i_vm_mark_stack (t->vp, mark_stack_ptr, | |
121 | mark_stack_limit); | |
122 | ||
7af0c3b3 AW |
123 | return mark_stack_ptr; |
124 | } | |
125 | ||
126 | ||
127 | \f | |
6180e336 NJ |
128 | static void |
129 | to_timespec (SCM t, scm_t_timespec *waittime) | |
130 | { | |
131 | if (scm_is_pair (t)) | |
132 | { | |
133 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
134 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
135 | } | |
136 | else | |
137 | { | |
138 | double time = scm_to_double (t); | |
139 | double sec = scm_c_truncate (time); | |
140 | ||
141 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 142 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
143 | } |
144 | } | |
145 | ||
7af0c3b3 | 146 | |
c058db8a | 147 | \f |
d823b11b | 148 | /*** Queues */ |
7bfd3b9e | 149 | |
c058db8a LC |
150 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
151 | the risk of false references leading to unbounded retained space as | |
152 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
153 | H.J. Boehm, 2001. */ | |
154 | ||
9de87eea MV |
155 | /* Make an empty queue data structure. |
156 | */ | |
d823b11b MV |
157 | static SCM |
158 | make_queue () | |
159 | { | |
160 | return scm_cons (SCM_EOL, SCM_EOL); | |
161 | } | |
7bfd3b9e | 162 | |
9de87eea MV |
163 | /* Put T at the back of Q and return a handle that can be used with |
164 | remqueue to remove T from Q again. | |
165 | */ | |
d823b11b MV |
166 | static SCM |
167 | enqueue (SCM q, SCM t) | |
168 | { | |
169 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 170 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 171 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
172 | SCM_SETCDR (q, c); |
173 | else | |
174 | SCM_SETCDR (SCM_CAR (q), c); | |
175 | SCM_SETCAR (q, c); | |
d2a51087 | 176 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
177 | return c; |
178 | } | |
7bfd3b9e | 179 | |
9de87eea MV |
180 | /* Remove the element that the handle C refers to from the queue Q. C |
181 | must have been returned from a call to enqueue. The return value | |
182 | is zero when the element referred to by C has already been removed. | |
183 | Otherwise, 1 is returned. | |
184 | */ | |
185 | static int | |
d823b11b MV |
186 | remqueue (SCM q, SCM c) |
187 | { | |
188 | SCM p, prev = q; | |
d2a51087 | 189 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 190 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 191 | { |
bc36d050 | 192 | if (scm_is_eq (p, c)) |
d823b11b | 193 | { |
bc36d050 | 194 | if (scm_is_eq (c, SCM_CAR (q))) |
10454601 | 195 | SCM_SETCAR (q, scm_is_eq (prev, q) ? SCM_EOL : prev); |
d823b11b | 196 | SCM_SETCDR (prev, SCM_CDR (c)); |
c058db8a LC |
197 | |
198 | /* GC-robust */ | |
199 | SCM_SETCDR (c, SCM_EOL); | |
200 | ||
d2a51087 | 201 | SCM_CRITICAL_SECTION_END; |
9de87eea | 202 | return 1; |
d823b11b MV |
203 | } |
204 | prev = p; | |
205 | } | |
d2a51087 | 206 | SCM_CRITICAL_SECTION_END; |
9de87eea | 207 | return 0; |
d823b11b MV |
208 | } |
209 | ||
9de87eea MV |
210 | /* Remove the front-most element from the queue Q and return it. |
211 | Return SCM_BOOL_F when Q is empty. | |
212 | */ | |
d823b11b MV |
213 | static SCM |
214 | dequeue (SCM q) | |
215 | { | |
d2a51087 NJ |
216 | SCM c; |
217 | SCM_CRITICAL_SECTION_START; | |
218 | c = SCM_CDR (q); | |
d2e53ed6 | 219 | if (scm_is_null (c)) |
d2a51087 NJ |
220 | { |
221 | SCM_CRITICAL_SECTION_END; | |
222 | return SCM_BOOL_F; | |
223 | } | |
d823b11b MV |
224 | else |
225 | { | |
226 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 227 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 228 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 229 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
230 | |
231 | /* GC-robust */ | |
232 | SCM_SETCDR (c, SCM_EOL); | |
233 | ||
d823b11b MV |
234 | return SCM_CAR (c); |
235 | } | |
236 | } | |
7bfd3b9e | 237 | |
9de87eea | 238 | /*** Thread smob routines */ |
76da80e7 | 239 | |
d823b11b MV |
240 | |
241 | static int | |
242 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
243 | { | |
23d72566 KR |
244 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
245 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
246 | the struct case, hence we go via a union, and extract according to the | |
247 | size of pthread_t. */ | |
248 | union { | |
249 | scm_i_pthread_t p; | |
250 | unsigned short us; | |
251 | unsigned int ui; | |
252 | unsigned long ul; | |
253 | scm_t_uintmax um; | |
254 | } u; | |
9de87eea | 255 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
256 | scm_i_pthread_t p = t->pthread; |
257 | scm_t_uintmax id; | |
258 | u.p = p; | |
259 | if (sizeof (p) == sizeof (unsigned short)) | |
260 | id = u.us; | |
261 | else if (sizeof (p) == sizeof (unsigned int)) | |
262 | id = u.ui; | |
263 | else if (sizeof (p) == sizeof (unsigned long)) | |
264 | id = u.ul; | |
265 | else | |
266 | id = u.um; | |
267 | ||
0607ebbf | 268 | scm_puts_unlocked ("#<thread ", port); |
23d72566 | 269 | scm_uintprint (id, 10, port); |
0607ebbf | 270 | scm_puts_unlocked (" (", port); |
0345e278 | 271 | scm_uintprint ((scm_t_bits)t, 16, port); |
0607ebbf | 272 | scm_puts_unlocked (")>", port); |
d823b11b MV |
273 | return 1; |
274 | } | |
275 | ||
706846f6 | 276 | \f |
9de87eea | 277 | /*** Blocking on queues. */ |
f7eca35d | 278 | |
9de87eea MV |
279 | /* See also scm_i_queue_async_cell for how such a block is |
280 | interrputed. | |
281 | */ | |
d823b11b | 282 | |
9de87eea MV |
283 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
284 | be woken up by a call to 'unblock_from_queue', or to be | |
285 | interrupted. Upon return of this function, the current thread is | |
286 | no longer on QUEUE, even when the sleep has been interrupted. | |
287 | ||
d2a51087 | 288 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
289 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
290 | ||
291 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
292 | as MUTEX is needed. | |
293 | ||
294 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
295 | ||
296 | The return value of block_self is an errno value. It will be zero | |
297 | when the sleep has been successfully completed by a call to | |
298 | unblock_from_queue, EINTR when it has been interrupted by the | |
299 | delivery of a system async, and ETIMEDOUT when the timeout has | |
300 | expired. | |
301 | ||
302 | The system asyncs themselves are not executed by block_self. | |
303 | */ | |
304 | static int | |
305 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
306 | const scm_t_timespec *waittime) | |
76da80e7 | 307 | { |
9de87eea MV |
308 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
309 | SCM q_handle; | |
310 | int err; | |
311 | ||
312 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
313 | err = EINTR; | |
314 | else | |
315 | { | |
316 | t->block_asyncs++; | |
317 | q_handle = enqueue (queue, t->handle); | |
318 | if (waittime == NULL) | |
319 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
320 | else | |
321 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
322 | ||
323 | /* When we are still on QUEUE, we have been interrupted. We | |
324 | report this only when no other error (such as a timeout) has | |
325 | happened above. | |
326 | */ | |
327 | if (remqueue (queue, q_handle) && err == 0) | |
328 | err = EINTR; | |
329 | t->block_asyncs--; | |
330 | scm_i_reset_sleep (t); | |
331 | } | |
332 | ||
333 | return err; | |
76da80e7 | 334 | } |
9de87eea | 335 | |
d2a51087 NJ |
336 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
337 | returned, or #f if the queue was empty. | |
9de87eea MV |
338 | */ |
339 | static SCM | |
340 | unblock_from_queue (SCM queue) | |
341 | { | |
342 | SCM thread = dequeue (queue); | |
343 | if (scm_is_true (thread)) | |
344 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
345 | return thread; | |
346 | } | |
347 | ||
45f15cac | 348 | \f |
9de87eea MV |
349 | /* Getting into and out of guile mode. |
350 | */ | |
351 | ||
f60a7648 AW |
352 | /* Key used to attach a cleanup handler to a given thread. Also, if |
353 | thread-local storage is unavailable, this key is used to retrieve the | |
354 | current thread with `pthread_getspecific ()'. */ | |
355 | scm_i_pthread_key_t scm_i_thread_key; | |
356 | ||
357 | ||
705edb95 LC |
358 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
359 | ||
360 | /* When thread-local storage (TLS) is available, a pointer to the | |
361 | current-thread object is kept in TLS. Note that storing the thread-object | |
362 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
363 | possible since thread objects may live longer than the actual thread they | |
364 | represent. */ | |
365 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
366 | ||
f60a7648 | 367 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 368 | |
d823b11b | 369 | |
9de87eea MV |
370 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
371 | static scm_i_thread *all_threads = NULL; | |
372 | static int thread_count; | |
373 | ||
374 | static SCM scm_i_default_dynamic_state; | |
375 | ||
0b77014f AW |
376 | /* Run when a fluid is collected. */ |
377 | void | |
aafb4ed7 | 378 | scm_i_reset_fluid (size_t n) |
0b77014f AW |
379 | { |
380 | scm_i_thread *t; | |
381 | ||
382 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
383 | for (t = all_threads; t; t = t->next_thread) | |
384 | if (SCM_I_DYNAMIC_STATE_P (t->dynamic_state)) | |
385 | { | |
386 | SCM v = SCM_I_DYNAMIC_STATE_FLUIDS (t->dynamic_state); | |
387 | ||
388 | if (n < SCM_SIMPLE_VECTOR_LENGTH (v)) | |
aafb4ed7 | 389 | SCM_SIMPLE_VECTOR_SET (v, n, SCM_UNDEFINED); |
0b77014f AW |
390 | } |
391 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
392 | } | |
393 | ||
9de87eea | 394 | /* Perform first stage of thread initialisation, in non-guile mode. |
d823b11b | 395 | */ |
9de87eea | 396 | static void |
12c1d861 | 397 | guilify_self_1 (struct GC_stack_base *base) |
d823b11b | 398 | { |
7f22442b AW |
399 | scm_i_thread t; |
400 | ||
401 | /* We must arrange for SCM_I_CURRENT_THREAD to point to a valid value | |
402 | before allocating anything in this thread, because allocation could | |
403 | cause GC to run, and GC could cause finalizers, which could invoke | |
404 | Scheme functions, which need the current thread to be set. */ | |
405 | ||
406 | t.pthread = scm_i_pthread_self (); | |
407 | t.handle = SCM_BOOL_F; | |
408 | t.result = SCM_BOOL_F; | |
409 | t.cleanup_handler = SCM_BOOL_F; | |
410 | t.mutexes = SCM_EOL; | |
411 | t.held_mutex = NULL; | |
412 | t.join_queue = SCM_EOL; | |
aef1fcf9 AW |
413 | t.freelists = NULL; |
414 | t.pointerless_freelists = NULL; | |
7f22442b | 415 | t.dynamic_state = SCM_BOOL_F; |
9ede013f AW |
416 | t.dynstack.base = NULL; |
417 | t.dynstack.top = NULL; | |
418 | t.dynstack.limit = NULL; | |
7f22442b AW |
419 | t.active_asyncs = SCM_EOL; |
420 | t.block_asyncs = 1; | |
421 | t.pending_asyncs = 1; | |
422 | t.critical_section_level = 0; | |
423 | t.base = base->mem_base; | |
346e4402 | 424 | #ifdef __ia64__ |
bbd21051 | 425 | t.register_backing_store_base = base->reg_base; |
346e4402 | 426 | #endif |
7f22442b AW |
427 | t.continuation_root = SCM_EOL; |
428 | t.continuation_base = t.base; | |
429 | scm_i_pthread_cond_init (&t.sleep_cond, NULL); | |
430 | t.sleep_mutex = NULL; | |
431 | t.sleep_object = SCM_BOOL_F; | |
432 | t.sleep_fd = -1; | |
7af0c3b3 | 433 | t.vp = NULL; |
7f22442b | 434 | |
32f94bf2 | 435 | if (pipe2 (t.sleep_pipe, O_CLOEXEC) != 0) |
634aa8de LC |
436 | /* FIXME: Error conditions during the initialization phase are handled |
437 | gracelessly since public functions such as `scm_init_guile ()' | |
438 | currently have type `void'. */ | |
439 | abort (); | |
440 | ||
7f22442b | 441 | scm_i_pthread_mutex_init (&t.admin_mutex, NULL); |
7f22442b AW |
442 | t.canceled = 0; |
443 | t.exited = 0; | |
444 | t.guile_mode = 0; | |
9de87eea | 445 | |
7f22442b AW |
446 | /* The switcheroo. */ |
447 | { | |
448 | scm_i_thread *t_ptr = &t; | |
449 | ||
450 | GC_disable (); | |
7af0c3b3 | 451 | t_ptr = GC_generic_malloc (sizeof (*t_ptr), thread_gc_kind); |
7f22442b AW |
452 | memcpy (t_ptr, &t, sizeof t); |
453 | ||
454 | scm_i_pthread_setspecific (scm_i_thread_key, t_ptr); | |
f60a7648 AW |
455 | |
456 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
7f22442b AW |
457 | /* Cache the current thread in TLS for faster lookup. */ |
458 | scm_i_current_thread = t_ptr; | |
f60a7648 | 459 | #endif |
9de87eea | 460 | |
7f22442b AW |
461 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
462 | t_ptr->next_thread = all_threads; | |
463 | all_threads = t_ptr; | |
464 | thread_count++; | |
465 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
466 | ||
467 | GC_enable (); | |
468 | } | |
d823b11b MV |
469 | } |
470 | ||
9de87eea | 471 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 472 | */ |
9de87eea MV |
473 | static void |
474 | guilify_self_2 (SCM parent) | |
d823b11b | 475 | { |
9de87eea MV |
476 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
477 | ||
72e6b608 LC |
478 | t->guile_mode = 1; |
479 | ||
9de87eea | 480 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 481 | |
9de87eea MV |
482 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
483 | t->continuation_base = t->base; | |
484 | ||
aef1fcf9 AW |
485 | { |
486 | size_t size = SCM_INLINE_GC_FREELIST_COUNT * sizeof (void *); | |
487 | t->freelists = scm_gc_malloc (size, "freelists"); | |
488 | t->pointerless_freelists = scm_gc_malloc (size, "atomic freelists"); | |
489 | } | |
490 | ||
9de87eea MV |
491 | if (scm_is_true (parent)) |
492 | t->dynamic_state = scm_make_dynamic_state (parent); | |
493 | else | |
494 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
495 | ||
9ede013f AW |
496 | t->dynstack.base = scm_gc_malloc (16 * sizeof (scm_t_bits), "dynstack"); |
497 | t->dynstack.limit = t->dynstack.base + 16; | |
498 | t->dynstack.top = t->dynstack.base + SCM_DYNSTACK_HEADER_LEN; | |
499 | ||
9de87eea MV |
500 | t->join_queue = make_queue (); |
501 | t->block_asyncs = 0; | |
f740445a AW |
502 | |
503 | /* See note in finalizers.c:queue_finalizer_async(). */ | |
504 | GC_invoke_finalizers (); | |
d823b11b MV |
505 | } |
506 | ||
6180e336 NJ |
507 | \f |
508 | /*** Fat mutexes */ | |
509 | ||
510 | /* We implement our own mutex type since we want them to be 'fair', we | |
511 | want to do fancy things while waiting for them (like running | |
512 | asyncs) and we might want to add things that are nice for | |
513 | debugging. | |
514 | */ | |
515 | ||
516 | typedef struct { | |
517 | scm_i_pthread_mutex_t lock; | |
518 | SCM owner; | |
adc085f1 | 519 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 520 | |
adc085f1 | 521 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
522 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
523 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
524 | owned by the current thread? */ | |
525 | ||
526 | SCM waiting; /* the threads waiting for this mutex. */ | |
527 | } fat_mutex; | |
528 | ||
529 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
530 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
531 | ||
2002f1f8 AW |
532 | static SCM |
533 | call_cleanup (void *data) | |
534 | { | |
535 | SCM *proc_p = data; | |
536 | return scm_call_0 (*proc_p); | |
537 | } | |
538 | ||
9de87eea | 539 | /* Perform thread tear-down, in guile mode. |
d823b11b | 540 | */ |
9de87eea MV |
541 | static void * |
542 | do_thread_exit (void *v) | |
543 | { | |
2e77f720 LC |
544 | scm_i_thread *t = (scm_i_thread *) v; |
545 | ||
546 | if (!scm_is_false (t->cleanup_handler)) | |
547 | { | |
548 | SCM ptr = t->cleanup_handler; | |
549 | ||
550 | t->cleanup_handler = SCM_BOOL_F; | |
551 | t->result = scm_internal_catch (SCM_BOOL_T, | |
2002f1f8 | 552 | call_cleanup, &ptr, |
2e77f720 LC |
553 | scm_handle_by_message_noexit, NULL); |
554 | } | |
9de87eea | 555 | |
86a597f8 | 556 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
557 | |
558 | t->exited = 1; | |
0c97d7dd MV |
559 | close (t->sleep_pipe[0]); |
560 | close (t->sleep_pipe[1]); | |
9de87eea MV |
561 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
562 | ; | |
9de87eea | 563 | |
74926120 | 564 | while (!scm_is_null (t->mutexes)) |
6180e336 | 565 | { |
a141db86 | 566 | SCM mutex = scm_c_weak_vector_ref (scm_car (t->mutexes), 0); |
74926120 | 567 | |
a141db86 | 568 | if (scm_is_true (mutex)) |
a0faf7dd LC |
569 | { |
570 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
571 | ||
572 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 | 573 | |
02a362a6 LC |
574 | /* Check whether T owns MUTEX. This is usually the case, unless |
575 | T abandoned MUTEX; in that case, T is no longer its owner (see | |
576 | `fat_mutex_lock') but MUTEX is still in `t->mutexes'. */ | |
577 | if (scm_is_eq (m->owner, t->handle)) | |
578 | unblock_from_queue (m->waiting); | |
f57fdf07 | 579 | |
a0faf7dd LC |
580 | scm_i_pthread_mutex_unlock (&m->lock); |
581 | } | |
6180e336 | 582 | |
a141db86 | 583 | t->mutexes = scm_cdr (t->mutexes); |
6180e336 NJ |
584 | } |
585 | ||
86a597f8 | 586 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 587 | |
9de87eea MV |
588 | return NULL; |
589 | } | |
590 | ||
f60a7648 AW |
591 | static void * |
592 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
593 | { | |
7f22442b | 594 | /* Won't hurt if we are already registered. */ |
8e76ce94 | 595 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 596 | GC_register_my_thread (sb); |
8e76ce94 | 597 | #endif |
f60a7648 | 598 | |
7f22442b | 599 | return scm_with_guile (do_thread_exit, v); |
f60a7648 AW |
600 | } |
601 | ||
d823b11b | 602 | static void |
9de87eea | 603 | on_thread_exit (void *v) |
d823b11b | 604 | { |
29776e85 | 605 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 606 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 607 | |
b8441577 LC |
608 | /* If we were canceled, we were unable to clear `t->guile_mode', so do |
609 | it here. */ | |
610 | t->guile_mode = 0; | |
611 | ||
d2a51087 NJ |
612 | /* If this thread was cancelled while doing a cond wait, it will |
613 | still have a mutex locked, so we unlock it here. */ | |
614 | if (t->held_mutex) | |
615 | { | |
616 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
617 | t->held_mutex = NULL; | |
618 | } | |
619 | ||
f60a7648 AW |
620 | /* Reinstate the current thread for purposes of scm_with_guile |
621 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
622 | case but it doesn't hurt to be consistent. */ | |
623 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 624 | |
7f22442b AW |
625 | /* Scheme-level thread finalizers and other cleanup needs to happen in |
626 | guile mode. */ | |
627 | GC_call_with_stack_base (do_thread_exit_trampoline, t); | |
0c97d7dd MV |
628 | |
629 | /* Removing ourself from the list of all threads needs to happen in | |
630 | non-guile mode since all SCM values on our stack become | |
29776e85 | 631 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
632 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
633 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
634 | if (*tp == t) | |
635 | { | |
636 | *tp = t->next_thread; | |
c058db8a LC |
637 | |
638 | /* GC-robust */ | |
639 | t->next_thread = NULL; | |
640 | ||
0c97d7dd MV |
641 | break; |
642 | } | |
643 | thread_count--; | |
2e77f720 LC |
644 | |
645 | /* If there's only one other thread, it could be the signal delivery | |
646 | thread, so we need to notify it to shut down by closing its read pipe. | |
647 | If it's not the signal delivery thread, then closing the read pipe isn't | |
648 | going to hurt. */ | |
649 | if (thread_count <= 1) | |
650 | scm_i_close_signal_pipe (); | |
651 | ||
0c97d7dd MV |
652 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
653 | ||
f60a7648 | 654 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
7f22442b | 655 | |
5f18bc84 AW |
656 | if (t->vp) |
657 | { | |
658 | scm_i_vm_free_stack (t->vp); | |
659 | t->vp = NULL; | |
660 | } | |
661 | ||
8e76ce94 | 662 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 663 | GC_unregister_my_thread (); |
653ccd78 | 664 | #endif |
d823b11b MV |
665 | } |
666 | ||
9de87eea | 667 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 668 | |
9de87eea MV |
669 | static void |
670 | init_thread_key (void) | |
671 | { | |
f60a7648 | 672 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 673 | } |
d823b11b | 674 | |
cde24ce1 AW |
675 | /* Perform any initializations necessary to make the current thread |
676 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
677 | if necessary. | |
a54a94b3 | 678 | |
9de87eea MV |
679 | BASE is the stack base to use with GC. |
680 | ||
681 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
682 | which case the default dynamic state is used. | |
683 | ||
cde24ce1 | 684 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 685 | return 1. |
cde24ce1 AW |
686 | |
687 | Note that it could be the case that the thread was known | |
688 | to Guile, but not in guile mode (because we are within a | |
689 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
690 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
691 | |
692 | static int | |
12c1d861 | 693 | scm_i_init_thread_for_guile (struct GC_stack_base *base, SCM parent) |
d823b11b | 694 | { |
9de87eea MV |
695 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
696 | ||
cde24ce1 AW |
697 | if (SCM_I_CURRENT_THREAD) |
698 | { | |
699 | /* Thread is already known to Guile. | |
700 | */ | |
701 | return 0; | |
702 | } | |
703 | else | |
9de87eea MV |
704 | { |
705 | /* This thread has not been guilified yet. | |
706 | */ | |
707 | ||
708 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
709 | if (scm_initialized_p == 0) | |
710 | { | |
711 | /* First thread ever to enter Guile. Run the full | |
712 | initialization. | |
713 | */ | |
714 | scm_i_init_guile (base); | |
12c1d861 | 715 | |
03d12949 | 716 | #if SCM_USE_PTHREAD_THREADS |
12c1d861 AW |
717 | /* Allow other threads to come in later. */ |
718 | GC_allow_register_threads (); | |
4000d064 | 719 | #endif |
12c1d861 | 720 | |
9de87eea MV |
721 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); |
722 | } | |
723 | else | |
724 | { | |
725 | /* Guile is already initialized, but this thread enters it for | |
726 | the first time. Only initialize this thread. | |
727 | */ | |
728 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
12c1d861 AW |
729 | |
730 | /* Register this thread with libgc. */ | |
8e76ce94 | 731 | #if SCM_USE_PTHREAD_THREADS |
12c1d861 | 732 | GC_register_my_thread (base); |
8e76ce94 | 733 | #endif |
12c1d861 | 734 | |
9de87eea MV |
735 | guilify_self_1 (base); |
736 | guilify_self_2 (parent); | |
737 | } | |
738 | return 1; | |
739 | } | |
d823b11b MV |
740 | } |
741 | ||
12c1d861 AW |
742 | void |
743 | scm_init_guile () | |
d823b11b | 744 | { |
12c1d861 AW |
745 | struct GC_stack_base stack_base; |
746 | ||
747 | if (GC_get_stack_base (&stack_base) == GC_SUCCESS) | |
748 | scm_i_init_thread_for_guile (&stack_base, | |
749 | scm_i_default_dynamic_state); | |
9de87eea MV |
750 | else |
751 | { | |
12c1d861 | 752 | fprintf (stderr, "Failed to get stack base for current thread.\n"); |
4765b28f | 753 | exit (EXIT_FAILURE); |
9de87eea | 754 | } |
a54a94b3 MV |
755 | } |
756 | ||
12c1d861 | 757 | struct with_guile_args |
cde24ce1 AW |
758 | { |
759 | GC_fn_type func; | |
760 | void *data; | |
12c1d861 | 761 | SCM parent; |
cde24ce1 AW |
762 | }; |
763 | ||
764 | static void * | |
765 | with_guile_trampoline (void *data) | |
766 | { | |
12c1d861 | 767 | struct with_guile_args *args = data; |
cde24ce1 AW |
768 | |
769 | return scm_c_with_continuation_barrier (args->func, args->data); | |
770 | } | |
771 | ||
12c1d861 AW |
772 | static void * |
773 | with_guile_and_parent (struct GC_stack_base *base, void *data) | |
9de87eea MV |
774 | { |
775 | void *res; | |
cde24ce1 AW |
776 | int new_thread; |
777 | scm_i_thread *t; | |
12c1d861 | 778 | struct with_guile_args *args = data; |
2e77f720 | 779 | |
12c1d861 | 780 | new_thread = scm_i_init_thread_for_guile (base, args->parent); |
cde24ce1 AW |
781 | t = SCM_I_CURRENT_THREAD; |
782 | if (new_thread) | |
2e77f720 | 783 | { |
cde24ce1 AW |
784 | /* We are in Guile mode. */ |
785 | assert (t->guile_mode); | |
786 | ||
12c1d861 | 787 | res = scm_c_with_continuation_barrier (args->func, args->data); |
cde24ce1 AW |
788 | |
789 | /* Leave Guile mode. */ | |
790 | t->guile_mode = 0; | |
791 | } | |
792 | else if (t->guile_mode) | |
793 | { | |
794 | /* Already in Guile mode. */ | |
12c1d861 | 795 | res = scm_c_with_continuation_barrier (args->func, args->data); |
2e77f720 | 796 | } |
74926120 | 797 | else |
cde24ce1 | 798 | { |
cde24ce1 AW |
799 | /* We are not in Guile mode, either because we are not within a |
800 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 801 | |
cde24ce1 AW |
802 | This call to scm_with_guile() could happen from anywhere on the |
803 | stack, and in particular lower on the stack than when it was | |
804 | when this thread was first guilified. Thus, `base' must be | |
805 | updated. */ | |
806 | #if SCM_STACK_GROWS_UP | |
12c1d861 AW |
807 | if (SCM_STACK_PTR (base->mem_base) < t->base) |
808 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 809 | #else |
12c1d861 AW |
810 | if (SCM_STACK_PTR (base->mem_base) > t->base) |
811 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 812 | #endif |
72e6b608 | 813 | |
cde24ce1 | 814 | t->guile_mode = 1; |
03d12949 | 815 | res = GC_call_with_gc_active (with_guile_trampoline, args); |
cde24ce1 AW |
816 | t->guile_mode = 0; |
817 | } | |
818 | return res; | |
72e6b608 | 819 | } |
3d1af79f | 820 | |
12c1d861 AW |
821 | static void * |
822 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) | |
823 | { | |
824 | struct with_guile_args args; | |
825 | ||
826 | args.func = func; | |
827 | args.data = data; | |
828 | args.parent = parent; | |
829 | ||
830 | return GC_call_with_stack_base (with_guile_and_parent, &args); | |
831 | } | |
832 | ||
833 | void * | |
834 | scm_with_guile (void *(*func)(void *), void *data) | |
835 | { | |
836 | return scm_i_with_guile_and_parent (func, data, | |
837 | scm_i_default_dynamic_state); | |
838 | } | |
839 | ||
9de87eea MV |
840 | void * |
841 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 842 | { |
72e6b608 | 843 | void *result; |
cde24ce1 | 844 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 845 | |
cde24ce1 | 846 | if (t->guile_mode) |
72e6b608 | 847 | { |
cde24ce1 | 848 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
03d12949 | 849 | result = GC_do_blocking (func, data); |
cde24ce1 | 850 | SCM_I_CURRENT_THREAD->guile_mode = 1; |
72e6b608 LC |
851 | } |
852 | else | |
cde24ce1 | 853 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
854 | result = func (data); |
855 | ||
856 | return result; | |
9de87eea MV |
857 | } |
858 | ||
72e6b608 | 859 | \f |
9de87eea MV |
860 | /*** Thread creation */ |
861 | ||
862 | typedef struct { | |
863 | SCM parent; | |
864 | SCM thunk; | |
865 | SCM handler; | |
76da80e7 | 866 | SCM thread; |
9de87eea MV |
867 | scm_i_pthread_mutex_t mutex; |
868 | scm_i_pthread_cond_t cond; | |
869 | } launch_data; | |
d823b11b | 870 | |
9de87eea MV |
871 | static void * |
872 | really_launch (void *d) | |
873 | { | |
874 | launch_data *data = (launch_data *)d; | |
875 | SCM thunk = data->thunk, handler = data->handler; | |
876 | scm_i_thread *t; | |
d823b11b | 877 | |
9de87eea | 878 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 879 | |
9de87eea MV |
880 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
881 | data->thread = scm_current_thread (); | |
882 | scm_i_pthread_cond_signal (&data->cond); | |
883 | scm_i_pthread_mutex_unlock (&data->mutex); | |
884 | ||
885 | if (SCM_UNBNDP (handler)) | |
886 | t->result = scm_call_0 (thunk); | |
887 | else | |
888 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
889 | ||
890 | return 0; | |
d823b11b MV |
891 | } |
892 | ||
9de87eea MV |
893 | static void * |
894 | launch_thread (void *d) | |
895 | { | |
896 | launch_data *data = (launch_data *)d; | |
897 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
898 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
899 | return NULL; | |
900 | } | |
901 | ||
902 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 903 | (SCM thunk, SCM handler), |
9de87eea MV |
904 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
905 | "returning a new thread object representing the thread. The procedure\n" | |
906 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
907 | "\n" | |
908 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
909 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
910 | "handler. This catch is established inside the continuation barrier.\n" | |
911 | "\n" | |
912 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
913 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
914 | #define FUNC_NAME s_scm_call_with_new_thread |
915 | { | |
9de87eea MV |
916 | launch_data data; |
917 | scm_i_pthread_t id; | |
918 | int err; | |
d823b11b | 919 | |
9de87eea MV |
920 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
921 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
922 | handler, SCM_ARG2, FUNC_NAME); | |
923 | ||
9f7537dc | 924 | GC_collect_a_little (); |
9de87eea MV |
925 | data.parent = scm_current_dynamic_state (); |
926 | data.thunk = thunk; | |
927 | data.handler = handler; | |
928 | data.thread = SCM_BOOL_F; | |
929 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
930 | scm_i_pthread_cond_init (&data.cond, NULL); | |
931 | ||
932 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
933 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
934 | if (err) | |
935 | { | |
936 | scm_i_pthread_mutex_unlock (&data.mutex); | |
937 | errno = err; | |
938 | scm_syserror (NULL); | |
939 | } | |
dbab8aaa AW |
940 | |
941 | while (scm_is_false (data.thread)) | |
942 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
943 | ||
9de87eea | 944 | scm_i_pthread_mutex_unlock (&data.mutex); |
74926120 | 945 | |
9de87eea | 946 | return data.thread; |
d823b11b MV |
947 | } |
948 | #undef FUNC_NAME | |
949 | ||
9de87eea MV |
950 | typedef struct { |
951 | SCM parent; | |
952 | scm_t_catch_body body; | |
953 | void *body_data; | |
954 | scm_t_catch_handler handler; | |
955 | void *handler_data; | |
956 | SCM thread; | |
957 | scm_i_pthread_mutex_t mutex; | |
958 | scm_i_pthread_cond_t cond; | |
959 | } spawn_data; | |
960 | ||
961 | static void * | |
962 | really_spawn (void *d) | |
963 | { | |
964 | spawn_data *data = (spawn_data *)d; | |
965 | scm_t_catch_body body = data->body; | |
966 | void *body_data = data->body_data; | |
967 | scm_t_catch_handler handler = data->handler; | |
968 | void *handler_data = data->handler_data; | |
969 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
970 | ||
971 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
972 | data->thread = scm_current_thread (); | |
973 | scm_i_pthread_cond_signal (&data->cond); | |
974 | scm_i_pthread_mutex_unlock (&data->mutex); | |
975 | ||
976 | if (handler == NULL) | |
977 | t->result = body (body_data); | |
978 | else | |
979 | t->result = scm_internal_catch (SCM_BOOL_T, | |
980 | body, body_data, | |
981 | handler, handler_data); | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | static void * | |
987 | spawn_thread (void *d) | |
988 | { | |
989 | spawn_data *data = (spawn_data *)d; | |
990 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
991 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
992 | return NULL; | |
993 | } | |
994 | ||
995 | SCM | |
996 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
997 | scm_t_catch_handler handler, void *handler_data) | |
998 | { | |
999 | spawn_data data; | |
1000 | scm_i_pthread_t id; | |
1001 | int err; | |
1002 | ||
1003 | data.parent = scm_current_dynamic_state (); | |
1004 | data.body = body; | |
1005 | data.body_data = body_data; | |
1006 | data.handler = handler; | |
1007 | data.handler_data = handler_data; | |
1008 | data.thread = SCM_BOOL_F; | |
1009 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1010 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1011 | ||
1012 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1013 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1014 | if (err) | |
1015 | { | |
1016 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1017 | errno = err; | |
1018 | scm_syserror (NULL); | |
1019 | } | |
dbab8aaa AW |
1020 | |
1021 | while (scm_is_false (data.thread)) | |
1022 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1023 | ||
9de87eea | 1024 | scm_i_pthread_mutex_unlock (&data.mutex); |
74926120 | 1025 | |
0f4f2d9a LC |
1026 | assert (SCM_I_IS_THREAD (data.thread)); |
1027 | ||
9de87eea MV |
1028 | return data.thread; |
1029 | } | |
1030 | ||
29717c89 MD |
1031 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1032 | (), | |
1033 | "Move the calling thread to the end of the scheduling queue.") | |
1034 | #define FUNC_NAME s_scm_yield | |
1035 | { | |
9de87eea | 1036 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1037 | } |
1038 | #undef FUNC_NAME | |
1039 | ||
2e77f720 LC |
1040 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1041 | (SCM thread), | |
1042 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1043 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1044 | "been signaled to terminate, this function is a no-op.") | |
1045 | #define FUNC_NAME s_scm_cancel_thread | |
1046 | { | |
1047 | scm_i_thread *t = NULL; | |
1048 | ||
1049 | SCM_VALIDATE_THREAD (1, thread); | |
1050 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1051 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1052 | if (!t->canceled) |
1053 | { | |
1054 | t->canceled = 1; | |
86a597f8 | 1055 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1056 | scm_i_pthread_cancel (t->pthread); |
1057 | } | |
1058 | else | |
86a597f8 | 1059 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1060 | |
1061 | return SCM_UNSPECIFIED; | |
1062 | } | |
1063 | #undef FUNC_NAME | |
1064 | ||
1065 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1066 | (SCM thread, SCM proc), | |
1067 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1068 | "This handler will be called when the thread exits.") | |
1069 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1070 | { | |
1071 | scm_i_thread *t; | |
1072 | ||
1073 | SCM_VALIDATE_THREAD (1, thread); | |
1074 | if (!scm_is_false (proc)) | |
1075 | SCM_VALIDATE_THUNK (2, proc); | |
1076 | ||
2e77f720 | 1077 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1078 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1079 | ||
2e77f720 LC |
1080 | if (!(t->exited || t->canceled)) |
1081 | t->cleanup_handler = proc; | |
1082 | ||
86a597f8 | 1083 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1084 | |
1085 | return SCM_UNSPECIFIED; | |
1086 | } | |
1087 | #undef FUNC_NAME | |
1088 | ||
1089 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1090 | (SCM thread), | |
1091 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1092 | #define FUNC_NAME s_scm_thread_cleanup | |
1093 | { | |
1094 | scm_i_thread *t; | |
1095 | SCM ret; | |
1096 | ||
1097 | SCM_VALIDATE_THREAD (1, thread); | |
1098 | ||
2e77f720 | 1099 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1100 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1101 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1102 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1103 | |
1104 | return ret; | |
1105 | } | |
1106 | #undef FUNC_NAME | |
1107 | ||
6180e336 NJ |
1108 | SCM scm_join_thread (SCM thread) |
1109 | { | |
1110 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1111 | } | |
1112 | ||
1113 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1114 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1115 | "Suspend execution of the calling thread until the target @var{thread} " |
1116 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1117 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1118 | { |
9de87eea | 1119 | scm_i_thread *t; |
6180e336 NJ |
1120 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1121 | SCM res = SCM_BOOL_F; | |
1122 | ||
1123 | if (! (SCM_UNBNDP (timeoutval))) | |
1124 | res = timeoutval; | |
d823b11b MV |
1125 | |
1126 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1127 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1128 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1129 | |
9de87eea | 1130 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1131 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1132 | ||
6180e336 NJ |
1133 | if (! SCM_UNBNDP (timeout)) |
1134 | { | |
1135 | to_timespec (timeout, &ctimeout); | |
1136 | timeout_ptr = &ctimeout; | |
1137 | } | |
1138 | ||
1139 | if (t->exited) | |
1140 | res = t->result; | |
1141 | else | |
d823b11b | 1142 | { |
9de87eea MV |
1143 | while (1) |
1144 | { | |
74926120 | 1145 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1146 | timeout_ptr); |
1147 | if (err == 0) | |
1148 | { | |
1149 | if (t->exited) | |
1150 | { | |
1151 | res = t->result; | |
1152 | break; | |
1153 | } | |
1154 | } | |
1155 | else if (err == ETIMEDOUT) | |
9de87eea | 1156 | break; |
6180e336 | 1157 | |
86a597f8 | 1158 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1159 | SCM_TICK; |
86a597f8 | 1160 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1161 | |
1162 | /* Check for exit again, since we just released and | |
1163 | reacquired the admin mutex, before the next block_self | |
1164 | call (which would block forever if t has already | |
1165 | exited). */ | |
1166 | if (t->exited) | |
1167 | { | |
1168 | res = t->result; | |
1169 | break; | |
1170 | } | |
9de87eea | 1171 | } |
d823b11b | 1172 | } |
9de87eea | 1173 | |
86a597f8 | 1174 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1175 | |
d823b11b | 1176 | return res; |
5f05c406 MV |
1177 | } |
1178 | #undef FUNC_NAME | |
1179 | ||
6180e336 NJ |
1180 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1181 | (SCM obj), | |
1182 | "Return @code{#t} if @var{obj} is a thread.") | |
1183 | #define FUNC_NAME s_scm_thread_p | |
1184 | { | |
1185 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1186 | } | |
1187 | #undef FUNC_NAME | |
5f05c406 | 1188 | |
4079f87e | 1189 | |
76da80e7 | 1190 | static int |
9de87eea | 1191 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1192 | { |
9de87eea | 1193 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
0607ebbf | 1194 | scm_puts_unlocked ("#<mutex ", port); |
9de87eea | 1195 | scm_uintprint ((scm_t_bits)m, 16, port); |
0607ebbf | 1196 | scm_puts_unlocked (">", port); |
9de87eea | 1197 | return 1; |
76da80e7 MV |
1198 | } |
1199 | ||
76da80e7 | 1200 | static SCM |
6180e336 | 1201 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1202 | { |
9de87eea MV |
1203 | fat_mutex *m; |
1204 | SCM mx; | |
fea65eb2 | 1205 | scm_i_pthread_mutex_t lock = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
9de87eea MV |
1206 | |
1207 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
fea65eb2 AW |
1208 | /* Because PTHREAD_MUTEX_INITIALIZER is static, it's plain old data, |
1209 | and so we can just copy it. */ | |
1210 | memcpy (&m->lock, &lock, sizeof (m->lock)); | |
9de87eea | 1211 | m->owner = SCM_BOOL_F; |
adc085f1 | 1212 | m->level = 0; |
6180e336 | 1213 | |
adc085f1 | 1214 | m->recursive = recursive; |
6180e336 NJ |
1215 | m->unchecked_unlock = unchecked_unlock; |
1216 | m->allow_external_unlock = external_unlock; | |
1217 | ||
9de87eea MV |
1218 | m->waiting = SCM_EOL; |
1219 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1220 | m->waiting = make_queue (); | |
1221 | return mx; | |
76da80e7 MV |
1222 | } |
1223 | ||
6180e336 NJ |
1224 | SCM scm_make_mutex (void) |
1225 | { | |
1226 | return scm_make_mutex_with_flags (SCM_EOL); | |
1227 | } | |
1228 | ||
2a1d0688 NJ |
1229 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1230 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1231 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1232 | |
1233 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1234 | (SCM flags), | |
9de87eea | 1235 | "Create a new mutex. ") |
6180e336 | 1236 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1237 | { |
6180e336 NJ |
1238 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1239 | ||
1240 | SCM ptr = flags; | |
1241 | while (! scm_is_null (ptr)) | |
1242 | { | |
1243 | SCM flag = SCM_CAR (ptr); | |
1244 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1245 | unchecked_unlock = 1; | |
1246 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1247 | external_unlock = 1; | |
1248 | else if (scm_is_eq (flag, recursive_sym)) | |
1249 | recursive = 1; | |
74926120 | 1250 | else |
2a1d0688 | 1251 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1252 | ptr = SCM_CDR (ptr); |
1253 | } | |
1254 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1255 | } |
1256 | #undef FUNC_NAME | |
1257 | ||
9de87eea | 1258 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1259 | (void), |
9de87eea MV |
1260 | "Create a new recursive mutex. ") |
1261 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1262 | { |
6180e336 | 1263 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1264 | } |
1265 | #undef FUNC_NAME | |
1266 | ||
6180e336 NJ |
1267 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1268 | ||
1269 | static SCM | |
adc085f1 | 1270 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1271 | { |
1272 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1273 | |
adc085f1 | 1274 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1275 | SCM err = SCM_BOOL_F; |
1276 | ||
1277 | struct timeval current_time; | |
9de87eea MV |
1278 | |
1279 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1280 | |
1281 | while (1) | |
9de87eea | 1282 | { |
adc085f1 | 1283 | if (m->level == 0) |
6180e336 | 1284 | { |
adc085f1 | 1285 | m->owner = new_owner; |
6180e336 | 1286 | m->level++; |
74926120 | 1287 | |
adc085f1 | 1288 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1289 | { |
adc085f1 | 1290 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
ccb80964 | 1291 | |
4f39f31e LC |
1292 | /* FIXME: The order in which `t->admin_mutex' and |
1293 | `m->lock' are taken differs from that in | |
1294 | `on_thread_exit', potentially leading to deadlocks. */ | |
6180e336 | 1295 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1296 | |
1297 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1298 | retained when not referenced elsewhere (bug #27450). |
1299 | The weak pair itself is eventually removed when MUTEX | |
1300 | is unlocked. Note that `t->mutexes' lists mutexes | |
1301 | currently held by T, so it should be small. */ | |
a141db86 AW |
1302 | t->mutexes = scm_cons (scm_make_weak_vector (SCM_INUM1, mutex), |
1303 | t->mutexes); | |
a0faf7dd | 1304 | |
6180e336 | 1305 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1306 | } |
adc085f1 JG |
1307 | *ret = 1; |
1308 | break; | |
1309 | } | |
1310 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1311 | { | |
1312 | m->owner = new_owner; | |
1313 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1314 | scm_from_locale_string ("lock obtained on abandoned " | |
1315 | "mutex")); | |
1316 | *ret = 1; | |
1317 | break; | |
1318 | } | |
1319 | else if (scm_is_eq (m->owner, new_owner)) | |
1320 | { | |
1321 | if (m->recursive) | |
1322 | { | |
1323 | m->level++; | |
74926120 | 1324 | *ret = 1; |
adc085f1 JG |
1325 | } |
1326 | else | |
6180e336 | 1327 | { |
adc085f1 JG |
1328 | err = scm_cons (scm_misc_error_key, |
1329 | scm_from_locale_string ("mutex already locked " | |
1330 | "by thread")); | |
1331 | *ret = 0; | |
1332 | } | |
74926120 | 1333 | break; |
adc085f1 | 1334 | } |
9de87eea | 1335 | else |
9de87eea | 1336 | { |
74926120 | 1337 | if (timeout != NULL) |
adc085f1 JG |
1338 | { |
1339 | gettimeofday (¤t_time, NULL); | |
1340 | if (current_time.tv_sec > timeout->tv_sec || | |
1341 | (current_time.tv_sec == timeout->tv_sec && | |
1342 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1343 | { |
adc085f1 JG |
1344 | *ret = 0; |
1345 | break; | |
6180e336 | 1346 | } |
6180e336 | 1347 | } |
37a52039 | 1348 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1349 | scm_i_pthread_mutex_unlock (&m->lock); |
1350 | SCM_TICK; | |
1351 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1352 | } | |
1353 | } | |
1354 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1355 | return err; |
9de87eea MV |
1356 | } |
1357 | ||
6180e336 NJ |
1358 | SCM scm_lock_mutex (SCM mx) |
1359 | { | |
adc085f1 | 1360 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1361 | } |
1362 | ||
adc085f1 JG |
1363 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1364 | (SCM m, SCM timeout, SCM owner), | |
b7e64f8b BT |
1365 | "Lock mutex @var{m}. If the mutex is already locked, the calling\n" |
1366 | "thread blocks until the mutex becomes available. The function\n" | |
1367 | "returns when the calling thread owns the lock on @var{m}.\n" | |
1368 | "Locking a mutex that a thread already owns will succeed right\n" | |
1369 | "away and will not block the thread. That is, Guile's mutexes\n" | |
1370 | "are @emph{recursive}.") | |
6180e336 | 1371 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1372 | { |
6180e336 NJ |
1373 | SCM exception; |
1374 | int ret = 0; | |
1375 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1376 | |
6180e336 NJ |
1377 | SCM_VALIDATE_MUTEX (1, m); |
1378 | ||
1379 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1380 | { | |
1381 | to_timespec (timeout, &cwaittime); | |
1382 | waittime = &cwaittime; | |
1383 | } | |
1384 | ||
97ec95b7 LC |
1385 | if (!SCM_UNBNDP (owner) && !scm_is_false (owner)) |
1386 | SCM_VALIDATE_THREAD (3, owner); | |
1387 | ||
adc085f1 | 1388 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1389 | if (!scm_is_false (exception)) |
1390 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1391 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1392 | } |
76da80e7 | 1393 | #undef FUNC_NAME |
9bc4701c | 1394 | |
9ec1573d MW |
1395 | static void |
1396 | lock_mutex_return_void (SCM mx) | |
1397 | { | |
1398 | (void) scm_lock_mutex (mx); | |
1399 | } | |
1400 | ||
1401 | static void | |
1402 | unlock_mutex_return_void (SCM mx) | |
1403 | { | |
1404 | (void) scm_unlock_mutex (mx); | |
1405 | } | |
1406 | ||
a4d106c7 | 1407 | void |
661ae7ab | 1408 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1409 | { |
9ec1573d | 1410 | scm_dynwind_unwind_handler_with_scm (unlock_mutex_return_void, mutex, |
661ae7ab | 1411 | SCM_F_WIND_EXPLICITLY); |
9ec1573d | 1412 | scm_dynwind_rewind_handler_with_scm (lock_mutex_return_void, mutex, |
661ae7ab | 1413 | SCM_F_WIND_EXPLICITLY); |
a4d106c7 MV |
1414 | } |
1415 | ||
9bc4701c | 1416 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1417 | (SCM mutex), |
9bc4701c MD |
1418 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1419 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1420 | #define FUNC_NAME s_scm_try_mutex | |
1421 | { | |
6180e336 NJ |
1422 | SCM exception; |
1423 | int ret = 0; | |
1424 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1425 | |
ba1b7223 | 1426 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1427 | |
1428 | to_timespec (scm_from_int(0), &cwaittime); | |
1429 | waittime = &cwaittime; | |
74926120 | 1430 | |
adc085f1 | 1431 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1432 | if (!scm_is_false (exception)) |
1433 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1434 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1435 | } |
1436 | #undef FUNC_NAME | |
76da80e7 | 1437 | |
6180e336 NJ |
1438 | /*** Fat condition variables */ |
1439 | ||
1440 | typedef struct { | |
1441 | scm_i_pthread_mutex_t lock; | |
1442 | SCM waiting; /* the threads waiting for this condition. */ | |
1443 | } fat_cond; | |
1444 | ||
1445 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1446 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1447 | ||
a141db86 AW |
1448 | static void |
1449 | remove_mutex_from_thread (SCM mutex, scm_i_thread *t) | |
1450 | { | |
1451 | SCM walk, prev; | |
1452 | ||
1453 | for (prev = SCM_BOOL_F, walk = t->mutexes; scm_is_pair (walk); | |
1454 | walk = SCM_CDR (walk)) | |
1455 | { | |
1456 | if (scm_is_eq (mutex, scm_c_weak_vector_ref (SCM_CAR (walk), 0))) | |
1457 | { | |
1458 | if (scm_is_pair (prev)) | |
1459 | SCM_SETCDR (prev, SCM_CDR (walk)); | |
1460 | else | |
1461 | t->mutexes = SCM_CDR (walk); | |
1462 | break; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | ||
6180e336 NJ |
1467 | static int |
1468 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1469 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1470 | { |
7f991c7d | 1471 | SCM owner; |
6180e336 NJ |
1472 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1473 | fat_cond *c = NULL; | |
1474 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1475 | int err = 0, ret = 0; | |
9de87eea MV |
1476 | |
1477 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1478 | |
7f991c7d | 1479 | owner = m->owner; |
adc085f1 | 1480 | |
d31ae2c3 | 1481 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1482 | { |
adc085f1 | 1483 | if (m->level == 0) |
6180e336 NJ |
1484 | { |
1485 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1486 | { |
1487 | scm_i_pthread_mutex_unlock (&m->lock); | |
1488 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1489 | } | |
d31ae2c3 | 1490 | owner = t->handle; |
6180e336 NJ |
1491 | } |
1492 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1493 | { |
1494 | scm_i_pthread_mutex_unlock (&m->lock); | |
1495 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1496 | } | |
6180e336 NJ |
1497 | } |
1498 | ||
1499 | if (! (SCM_UNBNDP (cond))) | |
1500 | { | |
6180e336 NJ |
1501 | c = SCM_CONDVAR_DATA (cond); |
1502 | while (1) | |
1503 | { | |
1504 | int brk = 0; | |
1505 | ||
6180e336 NJ |
1506 | if (m->level > 0) |
1507 | m->level--; | |
adc085f1 | 1508 | if (m->level == 0) |
f57fdf07 LC |
1509 | { |
1510 | /* Change the owner of MUTEX. */ | |
a141db86 | 1511 | remove_mutex_from_thread (mutex, t); |
f57fdf07 LC |
1512 | m->owner = unblock_from_queue (m->waiting); |
1513 | } | |
adc085f1 | 1514 | |
6180e336 | 1515 | t->block_asyncs++; |
74926120 | 1516 | |
d2a51087 NJ |
1517 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1518 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1519 | |
1520 | if (err == 0) | |
1521 | { | |
1522 | ret = 1; | |
1523 | brk = 1; | |
1524 | } | |
1525 | else if (err == ETIMEDOUT) | |
1526 | { | |
1527 | ret = 0; | |
1528 | brk = 1; | |
1529 | } | |
1530 | else if (err != EINTR) | |
74926120 | 1531 | { |
6180e336 | 1532 | errno = err; |
6180e336 | 1533 | scm_syserror (NULL); |
74926120 | 1534 | } |
6180e336 NJ |
1535 | |
1536 | if (brk) | |
1537 | { | |
1538 | if (relock) | |
adc085f1 | 1539 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1540 | t->block_asyncs--; |
6180e336 NJ |
1541 | break; |
1542 | } | |
74926120 | 1543 | |
6180e336 | 1544 | t->block_asyncs--; |
27c6ebcb | 1545 | scm_async_tick (); |
74926120 | 1546 | |
6180e336 NJ |
1547 | scm_remember_upto_here_2 (cond, mutex); |
1548 | ||
1549 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1550 | } | |
9bc4701c | 1551 | } |
9de87eea | 1552 | else |
6180e336 NJ |
1553 | { |
1554 | if (m->level > 0) | |
1555 | m->level--; | |
74926120 | 1556 | if (m->level == 0) |
f57fdf07 LC |
1557 | { |
1558 | /* Change the owner of MUTEX. */ | |
a141db86 | 1559 | remove_mutex_from_thread (mutex, t); |
f57fdf07 LC |
1560 | m->owner = unblock_from_queue (m->waiting); |
1561 | } | |
74926120 | 1562 | |
6180e336 NJ |
1563 | scm_i_pthread_mutex_unlock (&m->lock); |
1564 | ret = 1; | |
1565 | } | |
9de87eea | 1566 | |
6180e336 | 1567 | return ret; |
9bc4701c | 1568 | } |
9bc4701c | 1569 | |
6180e336 NJ |
1570 | SCM scm_unlock_mutex (SCM mx) |
1571 | { | |
1572 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1573 | } |
9bc4701c | 1574 | |
6180e336 NJ |
1575 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1576 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1577 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1578 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1579 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1580 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1581 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1582 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1583 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1584 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1585 | { |
6180e336 NJ |
1586 | scm_t_timespec cwaittime, *waittime = NULL; |
1587 | ||
9bc4701c | 1588 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1589 | if (! (SCM_UNBNDP (cond))) |
1590 | { | |
1591 | SCM_VALIDATE_CONDVAR (2, cond); | |
1592 | ||
2a1d8403 | 1593 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) |
6180e336 NJ |
1594 | { |
1595 | to_timespec (timeout, &cwaittime); | |
1596 | waittime = &cwaittime; | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1601 | } |
1602 | #undef FUNC_NAME | |
1603 | ||
6180e336 NJ |
1604 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1605 | (SCM obj), | |
1606 | "Return @code{#t} if @var{obj} is a mutex.") | |
1607 | #define FUNC_NAME s_scm_mutex_p | |
1608 | { | |
1609 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1610 | } | |
74926120 | 1611 | #undef FUNC_NAME |
9de87eea MV |
1612 | |
1613 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1614 | (SCM mx), | |
1615 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1616 | #define FUNC_NAME s_scm_mutex_owner | |
1617 | { | |
adc085f1 JG |
1618 | SCM owner; |
1619 | fat_mutex *m = NULL; | |
1620 | ||
9de87eea | 1621 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1622 | m = SCM_MUTEX_DATA (mx); |
1623 | scm_i_pthread_mutex_lock (&m->lock); | |
1624 | owner = m->owner; | |
1625 | scm_i_pthread_mutex_unlock (&m->lock); | |
1626 | ||
1627 | return owner; | |
9de87eea MV |
1628 | } |
1629 | #undef FUNC_NAME | |
1630 | ||
1631 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1632 | (SCM mx), | |
adc085f1 | 1633 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1634 | #define FUNC_NAME s_scm_mutex_level |
1635 | { | |
1636 | SCM_VALIDATE_MUTEX (1, mx); | |
1637 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1638 | } | |
1639 | #undef FUNC_NAME | |
1640 | ||
adc085f1 JG |
1641 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1642 | (SCM mx), | |
1643 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1644 | #define FUNC_NAME s_scm_mutex_locked_p | |
1645 | { | |
1646 | SCM_VALIDATE_MUTEX (1, mx); | |
1647 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1648 | } | |
1649 | #undef FUNC_NAME | |
9de87eea | 1650 | |
9de87eea MV |
1651 | static int |
1652 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1653 | { | |
1654 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
0607ebbf | 1655 | scm_puts_unlocked ("#<condition-variable ", port); |
9de87eea | 1656 | scm_uintprint ((scm_t_bits)c, 16, port); |
0607ebbf | 1657 | scm_puts_unlocked (">", port); |
9de87eea MV |
1658 | return 1; |
1659 | } | |
9bc4701c | 1660 | |
d823b11b MV |
1661 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1662 | (void), | |
1663 | "Make a new condition variable.") | |
1664 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1665 | { |
9de87eea MV |
1666 | fat_cond *c; |
1667 | SCM cv; | |
1668 | ||
1669 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1670 | c->waiting = SCM_EOL; |
1671 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1672 | c->waiting = make_queue (); | |
d823b11b | 1673 | return cv; |
5f05c406 | 1674 | } |
d823b11b | 1675 | #undef FUNC_NAME |
5f05c406 | 1676 | |
d823b11b MV |
1677 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1678 | (SCM cv, SCM mx, SCM t), | |
b7e64f8b BT |
1679 | "Wait until condition variable @var{cv} has been signalled. While waiting, " |
1680 | "mutex @var{mx} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1681 | "is locked again when this function returns. When @var{t} is given, " | |
d823b11b MV |
1682 | "it specifies a point in time where the waiting should be aborted. It " |
1683 | "can be either a integer as returned by @code{current-time} or a pair " | |
1684 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1685 | "mutex is locked and @code{#f} is returned. When the condition " | |
1686 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1687 | "is returned. ") | |
1688 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1689 | { |
9de87eea | 1690 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1691 | |
1692 | SCM_VALIDATE_CONDVAR (1, cv); | |
1693 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1694 | |
d823b11b MV |
1695 | if (!SCM_UNBNDP (t)) |
1696 | { | |
6180e336 | 1697 | to_timespec (t, &waittime); |
9de87eea | 1698 | waitptr = &waittime; |
d823b11b MV |
1699 | } |
1700 | ||
2a1d0688 | 1701 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1702 | } |
d823b11b | 1703 | #undef FUNC_NAME |
5f05c406 | 1704 | |
9de87eea MV |
1705 | static void |
1706 | fat_cond_signal (fat_cond *c) | |
1707 | { | |
9de87eea | 1708 | unblock_from_queue (c->waiting); |
9de87eea MV |
1709 | } |
1710 | ||
d823b11b MV |
1711 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1712 | (SCM cv), | |
1713 | "Wake up one thread that is waiting for @var{cv}") | |
1714 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1715 | { |
d823b11b | 1716 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1717 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1718 | return SCM_BOOL_T; |
5f05c406 | 1719 | } |
d823b11b | 1720 | #undef FUNC_NAME |
5f05c406 | 1721 | |
9de87eea MV |
1722 | static void |
1723 | fat_cond_broadcast (fat_cond *c) | |
1724 | { | |
9de87eea MV |
1725 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1726 | ; | |
9de87eea MV |
1727 | } |
1728 | ||
d823b11b MV |
1729 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1730 | (SCM cv), | |
1731 | "Wake up all threads that are waiting for @var{cv}. ") | |
1732 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1733 | { |
d823b11b | 1734 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1735 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1736 | return SCM_BOOL_T; |
5f05c406 | 1737 | } |
d823b11b | 1738 | #undef FUNC_NAME |
5f05c406 | 1739 | |
6180e336 NJ |
1740 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1741 | (SCM obj), | |
1742 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1743 | #define FUNC_NAME s_scm_condition_variable_p | |
1744 | { | |
1745 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1746 | } | |
1747 | #undef FUNC_NAME | |
1748 | ||
6087fad9 | 1749 | |
8c2b3143 | 1750 | \f |
d823b11b MV |
1751 | /*** Select */ |
1752 | ||
8c2b3143 LC |
1753 | struct select_args |
1754 | { | |
1755 | int nfds; | |
6ab4de61 AW |
1756 | fd_set *read_fds; |
1757 | fd_set *write_fds; | |
1758 | fd_set *except_fds; | |
8c2b3143 LC |
1759 | struct timeval *timeout; |
1760 | ||
1761 | int result; | |
1762 | int errno_value; | |
1763 | }; | |
1764 | ||
1765 | static void * | |
1766 | do_std_select (void *args) | |
1767 | { | |
1768 | struct select_args *select_args; | |
1769 | ||
1770 | select_args = (struct select_args *) args; | |
1771 | ||
1772 | select_args->result = | |
1773 | select (select_args->nfds, | |
1774 | select_args->read_fds, select_args->write_fds, | |
1775 | select_args->except_fds, select_args->timeout); | |
1776 | select_args->errno_value = errno; | |
1777 | ||
1778 | return NULL; | |
1779 | } | |
1780 | ||
6ab4de61 AW |
1781 | #if !SCM_HAVE_SYS_SELECT_H |
1782 | static int scm_std_select (int nfds, | |
1783 | fd_set *readfds, | |
1784 | fd_set *writefds, | |
1785 | fd_set *exceptfds, | |
1786 | struct timeval *timeout); | |
1787 | #endif | |
1788 | ||
911782b7 | 1789 | int |
9de87eea | 1790 | scm_std_select (int nfds, |
6ab4de61 AW |
1791 | fd_set *readfds, |
1792 | fd_set *writefds, | |
1793 | fd_set *exceptfds, | |
9de87eea MV |
1794 | struct timeval *timeout) |
1795 | { | |
1796 | fd_set my_readfds; | |
1797 | int res, eno, wakeup_fd; | |
1798 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1799 | struct select_args args; |
9de87eea MV |
1800 | |
1801 | if (readfds == NULL) | |
1802 | { | |
1803 | FD_ZERO (&my_readfds); | |
1804 | readfds = &my_readfds; | |
1805 | } | |
1806 | ||
1807 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1808 | SCM_TICK; | |
1809 | ||
1810 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1811 | FD_SET (wakeup_fd, readfds); |
1812 | if (wakeup_fd >= nfds) | |
1813 | nfds = wakeup_fd+1; | |
9de87eea | 1814 | |
8c2b3143 LC |
1815 | args.nfds = nfds; |
1816 | args.read_fds = readfds; | |
1817 | args.write_fds = writefds; | |
1818 | args.except_fds = exceptfds; | |
1819 | args.timeout = timeout; | |
1820 | ||
1821 | /* Explicitly cooperate with the GC. */ | |
1822 | scm_without_guile (do_std_select, &args); | |
1823 | ||
1824 | res = args.result; | |
1825 | eno = args.errno_value; | |
1826 | ||
1827 | t->sleep_fd = -1; | |
9de87eea MV |
1828 | scm_i_reset_sleep (t); |
1829 | ||
1830 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1831 | { | |
1832 | char dummy; | |
634aa8de LC |
1833 | full_read (wakeup_fd, &dummy, 1); |
1834 | ||
9de87eea MV |
1835 | FD_CLR (wakeup_fd, readfds); |
1836 | res -= 1; | |
1837 | if (res == 0) | |
1838 | { | |
1839 | eno = EINTR; | |
1840 | res = -1; | |
1841 | } | |
1842 | } | |
d823b11b MV |
1843 | errno = eno; |
1844 | return res; | |
5f05c406 MV |
1845 | } |
1846 | ||
9de87eea | 1847 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1848 | |
9de87eea | 1849 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1850 | |
2956b071 LC |
1851 | /* It seems reasonable to not run procedures related to mutex and condition |
1852 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1853 | without it, and (ii) the only potential gain would be GC latency. See | |
1854 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1855 | for a discussion of the pros and cons. */ | |
1856 | ||
9bc4701c | 1857 | int |
9de87eea | 1858 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1859 | { |
9de87eea | 1860 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1861 | return res; |
1862 | } | |
1863 | ||
9de87eea | 1864 | static void |
2b829bbb | 1865 | do_unlock (void *data) |
28d52ebb | 1866 | { |
9de87eea | 1867 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1868 | } |
1869 | ||
1870 | void | |
661ae7ab | 1871 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1872 | { |
9de87eea | 1873 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1874 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1875 | } |
1876 | ||
9bc4701c | 1877 | int |
9de87eea | 1878 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1879 | { |
4cf72f0b LC |
1880 | int res; |
1881 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1882 | ||
1883 | t->held_mutex = mutex; | |
1884 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1885 | t->held_mutex = NULL; | |
1886 | ||
9bc4701c MD |
1887 | return res; |
1888 | } | |
9bc4701c | 1889 | |
76da80e7 | 1890 | int |
9de87eea MV |
1891 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1892 | scm_i_pthread_mutex_t *mutex, | |
1893 | const scm_t_timespec *wt) | |
76da80e7 | 1894 | { |
4cf72f0b LC |
1895 | int res; |
1896 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1897 | ||
1898 | t->held_mutex = mutex; | |
1899 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1900 | t->held_mutex = NULL; | |
1901 | ||
9de87eea | 1902 | return res; |
76da80e7 MV |
1903 | } |
1904 | ||
9de87eea | 1905 | #endif |
76da80e7 | 1906 | |
e676a4c3 MW |
1907 | static void |
1908 | do_unlock_with_asyncs (void *data) | |
1909 | { | |
1910 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); | |
1911 | SCM_I_CURRENT_THREAD->block_asyncs--; | |
1912 | } | |
1913 | ||
1914 | void | |
1915 | scm_i_dynwind_pthread_mutex_lock_block_asyncs (scm_i_pthread_mutex_t *mutex) | |
1916 | { | |
1917 | SCM_I_CURRENT_THREAD->block_asyncs++; | |
1918 | scm_i_scm_pthread_mutex_lock (mutex); | |
1919 | scm_dynwind_unwind_handler (do_unlock_with_asyncs, mutex, | |
1920 | SCM_F_WIND_EXPLICITLY); | |
1921 | } | |
1922 | ||
d823b11b | 1923 | unsigned long |
9de87eea | 1924 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1925 | { |
d823b11b MV |
1926 | struct timeval tv; |
1927 | tv.tv_usec = usecs % 1000000; | |
1928 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1929 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1930 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1931 | } |
1932 | ||
9de87eea MV |
1933 | unsigned int |
1934 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1935 | { |
d823b11b MV |
1936 | struct timeval tv; |
1937 | tv.tv_usec = 0; | |
1938 | tv.tv_sec = secs; | |
9de87eea | 1939 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1940 | return tv.tv_sec; |
6c214b62 MD |
1941 | } |
1942 | ||
d823b11b MV |
1943 | /*** Misc */ |
1944 | ||
1945 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1946 | (void), | |
1947 | "Return the thread that called this function.") | |
1948 | #define FUNC_NAME s_scm_current_thread | |
1949 | { | |
9de87eea | 1950 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1951 | } |
1952 | #undef FUNC_NAME | |
1953 | ||
9de87eea MV |
1954 | static SCM |
1955 | scm_c_make_list (size_t n, SCM fill) | |
1956 | { | |
1957 | SCM res = SCM_EOL; | |
1958 | while (n-- > 0) | |
1959 | res = scm_cons (fill, res); | |
1960 | return res; | |
1961 | } | |
1962 | ||
d823b11b MV |
1963 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1964 | (void), | |
1965 | "Return a list of all threads.") | |
9bc4701c | 1966 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1967 | { |
9de87eea MV |
1968 | /* We can not allocate while holding the thread_admin_mutex because |
1969 | of the way GC is done. | |
1970 | */ | |
1971 | int n = thread_count; | |
1972 | scm_i_thread *t; | |
1973 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1974 | |
9de87eea MV |
1975 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1976 | l = &list; | |
1977 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1978 | { | |
2e77f720 LC |
1979 | if (t != scm_i_signal_delivery_thread) |
1980 | { | |
1981 | SCM_SETCAR (*l, t->handle); | |
1982 | l = SCM_CDRLOC (*l); | |
1983 | } | |
9de87eea MV |
1984 | n--; |
1985 | } | |
1986 | *l = SCM_EOL; | |
1987 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1988 | return list; | |
d823b11b | 1989 | } |
9de87eea | 1990 | #undef FUNC_NAME |
d823b11b MV |
1991 | |
1992 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1993 | (SCM thread), | |
1994 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1995 | #define FUNC_NAME s_scm_thread_exited_p | |
1996 | { | |
7888309b | 1997 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1998 | } |
1999 | #undef FUNC_NAME | |
2000 | ||
911782b7 | 2001 | int |
d823b11b MV |
2002 | scm_c_thread_exited_p (SCM thread) |
2003 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 2004 | { |
9de87eea | 2005 | scm_i_thread *t; |
d823b11b | 2006 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 2007 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 2008 | return t->exited; |
5f05c406 | 2009 | } |
d823b11b | 2010 | #undef FUNC_NAME |
5f05c406 | 2011 | |
d20912e6 LC |
2012 | SCM_DEFINE (scm_total_processor_count, "total-processor-count", 0, 0, 0, |
2013 | (void), | |
2014 | "Return the total number of processors of the machine, which\n" | |
2015 | "is guaranteed to be at least 1. A ``processor'' here is a\n" | |
2016 | "thread execution unit, which can be either:\n\n" | |
2017 | "@itemize\n" | |
2018 | "@item an execution core in a (possibly multi-core) chip, in a\n" | |
2019 | " (possibly multi- chip) module, in a single computer, or\n" | |
2020 | "@item a thread execution unit inside a core in the case of\n" | |
2021 | " @dfn{hyper-threaded} CPUs.\n" | |
2022 | "@end itemize\n\n" | |
2023 | "Which of the two definitions is used, is unspecified.\n") | |
2024 | #define FUNC_NAME s_scm_total_processor_count | |
2025 | { | |
2026 | return scm_from_ulong (num_processors (NPROC_ALL)); | |
2027 | } | |
2028 | #undef FUNC_NAME | |
2029 | ||
2030 | SCM_DEFINE (scm_current_processor_count, "current-processor-count", 0, 0, 0, | |
2031 | (void), | |
2032 | "Like @code{total-processor-count}, but return the number of\n" | |
2033 | "processors available to the current process. See\n" | |
2034 | "@code{setaffinity} and @code{getaffinity} for more\n" | |
2035 | "information.\n") | |
2036 | #define FUNC_NAME s_scm_current_processor_count | |
2037 | { | |
2038 | return scm_from_ulong (num_processors (NPROC_CURRENT)); | |
2039 | } | |
2040 | #undef FUNC_NAME | |
2041 | ||
2042 | ||
2043 | \f | |
2044 | ||
9de87eea | 2045 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
2046 | static int threads_initialized_p = 0; |
2047 | ||
9bc4701c | 2048 | |
a4d106c7 MV |
2049 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2050 | */ | |
d1138028 | 2051 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 2052 | |
661ae7ab | 2053 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2054 | |
9bc4701c | 2055 | void |
661ae7ab | 2056 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2057 | { |
a4d106c7 | 2058 | if (scm_is_false (mutex)) |
661ae7ab MV |
2059 | mutex = dynwind_critical_section_mutex; |
2060 | scm_dynwind_lock_mutex (mutex); | |
2061 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2062 | } |
2063 | ||
2064 | /*** Initialization */ | |
2065 | ||
9de87eea MV |
2066 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2067 | ||
d1138028 MV |
2068 | #if SCM_USE_PTHREAD_THREADS |
2069 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2070 | #endif | |
2071 | ||
9de87eea | 2072 | void |
12c1d861 | 2073 | scm_threads_prehistory (void *base) |
9de87eea | 2074 | { |
d1138028 MV |
2075 | #if SCM_USE_PTHREAD_THREADS |
2076 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2077 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2078 | PTHREAD_MUTEX_RECURSIVE); | |
2079 | #endif | |
2080 | ||
2081 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2082 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2083 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2084 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2085 | |
7af0c3b3 AW |
2086 | thread_gc_kind = |
2087 | GC_new_kind (GC_new_free_list (), | |
2088 | GC_MAKE_PROC (GC_new_proc (thread_mark), 0), | |
2089 | 0, 1); | |
2090 | ||
12c1d861 | 2091 | guilify_self_1 ((struct GC_stack_base *) base); |
9bc4701c MD |
2092 | } |
2093 | ||
d823b11b MV |
2094 | scm_t_bits scm_tc16_thread; |
2095 | scm_t_bits scm_tc16_mutex; | |
2096 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2097 | |
7bfd3b9e | 2098 | void |
9de87eea | 2099 | scm_init_threads () |
7bfd3b9e | 2100 | { |
9de87eea | 2101 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2102 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2103 | |
9de87eea | 2104 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea | 2105 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
9bc4701c | 2106 | |
9de87eea MV |
2107 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2108 | sizeof (fat_cond)); | |
9de87eea | 2109 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2110 | |
9de87eea MV |
2111 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2112 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2113 | threads_initialized_p = 1; |
a4d106c7 | 2114 | |
f39448c5 | 2115 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2116 | } |
89e00824 | 2117 | |
5f05c406 | 2118 | void |
9de87eea | 2119 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2120 | { |
9de87eea | 2121 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2122 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2123 | } |
2124 | ||
d823b11b | 2125 | void |
9de87eea | 2126 | scm_init_thread_procs () |
d823b11b | 2127 | { |
9de87eea | 2128 | #include "libguile/threads.x" |
d823b11b MV |
2129 | } |
2130 | ||
3c13664e LC |
2131 | \f |
2132 | /* IA64-specific things. */ | |
2133 | ||
2134 | #ifdef __ia64__ | |
2135 | # ifdef __hpux | |
2136 | # include <sys/param.h> | |
2137 | # include <sys/pstat.h> | |
2138 | void * | |
2139 | scm_ia64_register_backing_store_base (void) | |
2140 | { | |
2141 | struct pst_vm_status vm_status; | |
2142 | int i = 0; | |
2143 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2144 | if (vm_status.pst_type == PS_RSESTACK) | |
2145 | return (void *) vm_status.pst_vaddr; | |
2146 | abort (); | |
2147 | } | |
2148 | void * | |
2149 | scm_ia64_ar_bsp (const void *ctx) | |
2150 | { | |
2151 | uint64_t bsp; | |
2152 | __uc_get_ar_bsp (ctx, &bsp); | |
2153 | return (void *) bsp; | |
2154 | } | |
2155 | # endif /* hpux */ | |
2156 | # ifdef linux | |
2157 | # include <ucontext.h> | |
2158 | void * | |
2159 | scm_ia64_register_backing_store_base (void) | |
2160 | { | |
2161 | extern void *__libc_ia64_register_backing_store_base; | |
2162 | return __libc_ia64_register_backing_store_base; | |
2163 | } | |
2164 | void * | |
2165 | scm_ia64_ar_bsp (const void *opaque) | |
2166 | { | |
2167 | const ucontext_t *ctx = opaque; | |
2168 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2169 | } | |
2170 | # endif /* linux */ | |
ba20d262 AW |
2171 | # ifdef __FreeBSD__ |
2172 | # include <ucontext.h> | |
2173 | void * | |
2174 | scm_ia64_register_backing_store_base (void) | |
2175 | { | |
2176 | return (void *)0x8000000000000000; | |
2177 | } | |
2178 | void * | |
2179 | scm_ia64_ar_bsp (const void *opaque) | |
2180 | { | |
2181 | const ucontext_t *ctx = opaque; | |
2182 | return (void *)(ctx->uc_mcontext.mc_special.bspstore | |
2183 | + ctx->uc_mcontext.mc_special.ndirty); | |
2184 | } | |
2185 | # endif /* __FreeBSD__ */ | |
3c13664e LC |
2186 | #endif /* __ia64__ */ |
2187 | ||
2188 | ||
89e00824 ML |
2189 | /* |
2190 | Local Variables: | |
2191 | c-file-style: "gnu" | |
2192 | End: | |
2193 | */ |