Commit | Line | Data |
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cde24ce1 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
74926120 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
7bfd3b9e | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
7bfd3b9e | 20 | \f |
dbb605f5 LC |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
7bfd3b9e | 24 | |
1c44468d | 25 | #include "libguile/bdw-gc.h" |
1810dc4e RB |
26 | #include "libguile/_scm.h" |
27 | ||
fcc5d734 | 28 | #if HAVE_UNISTD_H |
d823b11b | 29 | #include <unistd.h> |
fcc5d734 | 30 | #endif |
d823b11b | 31 | #include <stdio.h> |
8ab3d8a0 KR |
32 | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
35 | #endif | |
36 | ||
fcc5d734 | 37 | #if HAVE_SYS_TIME_H |
d823b11b | 38 | #include <sys/time.h> |
fcc5d734 | 39 | #endif |
5f05c406 | 40 | |
f57fdf07 LC |
41 | #include <assert.h> |
42 | ||
d823b11b MV |
43 | #include "libguile/validate.h" |
44 | #include "libguile/root.h" | |
45 | #include "libguile/eval.h" | |
46 | #include "libguile/async.h" | |
47 | #include "libguile/ports.h" | |
48 | #include "libguile/threads.h" | |
a0599745 | 49 | #include "libguile/dynwind.h" |
d823b11b | 50 | #include "libguile/iselect.h" |
9de87eea MV |
51 | #include "libguile/fluids.h" |
52 | #include "libguile/continuations.h" | |
2b829bbb | 53 | #include "libguile/gc.h" |
9de87eea | 54 | #include "libguile/init.h" |
2e77f720 | 55 | #include "libguile/scmsigs.h" |
6180e336 | 56 | #include "libguile/strings.h" |
a0faf7dd | 57 | #include "libguile/weaks.h" |
7bfd3b9e | 58 | |
ecc9f40f MV |
59 | #ifdef __MINGW32__ |
60 | #ifndef ETIMEDOUT | |
61 | # define ETIMEDOUT WSAETIMEDOUT | |
62 | #endif | |
63 | # include <fcntl.h> | |
64 | # include <process.h> | |
65 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
66 | #endif /* __MINGW32__ */ | |
67 | ||
634aa8de LC |
68 | #include <full-read.h> |
69 | ||
cde24ce1 AW |
70 | |
71 | \f | |
72 | ||
73 | /* First some libgc shims. */ | |
74 | ||
75 | /* Make sure GC_fn_type is defined; it is missing from the public | |
76 | headers of GC 7.1 and earlier. */ | |
77 | #ifndef HAVE_GC_FN_TYPE | |
78 | typedef void * (* GC_fn_type) (void *); | |
79 | #endif | |
80 | ||
81 | ||
5f0d2951 AW |
82 | #ifndef GC_SUCCESS |
83 | #define GC_SUCCESS 0 | |
84 | #endif | |
85 | ||
86 | #ifndef GC_UNIMPLEMENTED | |
87 | #define GC_UNIMPLEMENTED 3 | |
88 | #endif | |
89 | ||
90 | /* Likewise struct GC_stack_base is missing before 7.1. */ | |
91 | #ifndef HAVE_GC_STACK_BASE | |
92 | struct GC_stack_base; | |
93 | ||
94 | static int | |
95 | GC_register_my_thread (struct GC_stack_base *) | |
96 | { | |
97 | return GC_UNIMPLEMENTED; | |
98 | } | |
99 | ||
100 | static void | |
101 | GC_unregister_my_thread () | |
102 | { | |
103 | } | |
104 | ||
105 | static void * | |
106 | GC_call_with_stack_base(void * (*fn) (struct GC_stack_base*, void*), void *arg) | |
107 | { | |
108 | return fn (NULL, arg); | |
109 | } | |
110 | #endif | |
111 | ||
112 | ||
cde24ce1 AW |
113 | /* Now define with_gc_active and with_gc_inactive. */ |
114 | ||
115 | #if (defined(HAVE_GC_DO_BLOCKING) && defined (HAVE_DECL_GC_DO_BLOCKING) && defined (HAVE_GC_CALL_WITH_GC_ACTIVE)) | |
116 | ||
117 | /* We have a sufficiently new libgc (7.2 or newer). */ | |
118 | ||
119 | static void* | |
120 | with_gc_inactive (GC_fn_type func, void *data) | |
121 | { | |
122 | return GC_do_blocking (func, data); | |
123 | } | |
124 | ||
125 | static void* | |
126 | with_gc_active (GC_fn_type func, void *data) | |
127 | { | |
128 | return GC_call_with_gc_active (func, data); | |
129 | } | |
130 | ||
131 | #else | |
132 | ||
133 | /* libgc not new enough, so never actually deactivate GC. | |
134 | ||
135 | Note that though GC 7.1 does have a GC_do_blocking, it doesn't have | |
136 | GC_call_with_gc_active. */ | |
137 | ||
138 | static void* | |
139 | with_gc_inactive (GC_fn_type func, void *data) | |
140 | { | |
141 | return func (data); | |
142 | } | |
143 | ||
144 | static void* | |
145 | with_gc_active (GC_fn_type func, void *data) | |
146 | { | |
147 | return func (data); | |
148 | } | |
149 | ||
150 | #endif /* HAVE_GC_DO_BLOCKING */ | |
151 | ||
152 | ||
634aa8de | 153 | \f |
6180e336 NJ |
154 | static void |
155 | to_timespec (SCM t, scm_t_timespec *waittime) | |
156 | { | |
157 | if (scm_is_pair (t)) | |
158 | { | |
159 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
160 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
161 | } | |
162 | else | |
163 | { | |
164 | double time = scm_to_double (t); | |
165 | double sec = scm_c_truncate (time); | |
166 | ||
167 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 168 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
169 | } |
170 | } | |
171 | ||
c058db8a | 172 | \f |
d823b11b | 173 | /*** Queues */ |
7bfd3b9e | 174 | |
c058db8a LC |
175 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
176 | the risk of false references leading to unbounded retained space as | |
177 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
178 | H.J. Boehm, 2001. */ | |
179 | ||
9de87eea MV |
180 | /* Make an empty queue data structure. |
181 | */ | |
d823b11b MV |
182 | static SCM |
183 | make_queue () | |
184 | { | |
185 | return scm_cons (SCM_EOL, SCM_EOL); | |
186 | } | |
7bfd3b9e | 187 | |
9de87eea MV |
188 | /* Put T at the back of Q and return a handle that can be used with |
189 | remqueue to remove T from Q again. | |
190 | */ | |
d823b11b MV |
191 | static SCM |
192 | enqueue (SCM q, SCM t) | |
193 | { | |
194 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 195 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 196 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
197 | SCM_SETCDR (q, c); |
198 | else | |
199 | SCM_SETCDR (SCM_CAR (q), c); | |
200 | SCM_SETCAR (q, c); | |
d2a51087 | 201 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
202 | return c; |
203 | } | |
7bfd3b9e | 204 | |
9de87eea MV |
205 | /* Remove the element that the handle C refers to from the queue Q. C |
206 | must have been returned from a call to enqueue. The return value | |
207 | is zero when the element referred to by C has already been removed. | |
208 | Otherwise, 1 is returned. | |
209 | */ | |
210 | static int | |
d823b11b MV |
211 | remqueue (SCM q, SCM c) |
212 | { | |
213 | SCM p, prev = q; | |
d2a51087 | 214 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 215 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 216 | { |
bc36d050 | 217 | if (scm_is_eq (p, c)) |
d823b11b | 218 | { |
bc36d050 | 219 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
220 | SCM_SETCAR (q, SCM_CDR (c)); |
221 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
222 | |
223 | /* GC-robust */ | |
224 | SCM_SETCDR (c, SCM_EOL); | |
225 | ||
d2a51087 | 226 | SCM_CRITICAL_SECTION_END; |
9de87eea | 227 | return 1; |
d823b11b MV |
228 | } |
229 | prev = p; | |
230 | } | |
d2a51087 | 231 | SCM_CRITICAL_SECTION_END; |
9de87eea | 232 | return 0; |
d823b11b MV |
233 | } |
234 | ||
9de87eea MV |
235 | /* Remove the front-most element from the queue Q and return it. |
236 | Return SCM_BOOL_F when Q is empty. | |
237 | */ | |
d823b11b MV |
238 | static SCM |
239 | dequeue (SCM q) | |
240 | { | |
d2a51087 NJ |
241 | SCM c; |
242 | SCM_CRITICAL_SECTION_START; | |
243 | c = SCM_CDR (q); | |
d2e53ed6 | 244 | if (scm_is_null (c)) |
d2a51087 NJ |
245 | { |
246 | SCM_CRITICAL_SECTION_END; | |
247 | return SCM_BOOL_F; | |
248 | } | |
d823b11b MV |
249 | else |
250 | { | |
251 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 252 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 253 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 254 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
255 | |
256 | /* GC-robust */ | |
257 | SCM_SETCDR (c, SCM_EOL); | |
258 | ||
d823b11b MV |
259 | return SCM_CAR (c); |
260 | } | |
261 | } | |
7bfd3b9e | 262 | |
9de87eea | 263 | /*** Thread smob routines */ |
76da80e7 | 264 | |
d823b11b MV |
265 | |
266 | static int | |
267 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
268 | { | |
23d72566 KR |
269 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
270 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
271 | the struct case, hence we go via a union, and extract according to the | |
272 | size of pthread_t. */ | |
273 | union { | |
274 | scm_i_pthread_t p; | |
275 | unsigned short us; | |
276 | unsigned int ui; | |
277 | unsigned long ul; | |
278 | scm_t_uintmax um; | |
279 | } u; | |
9de87eea | 280 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
281 | scm_i_pthread_t p = t->pthread; |
282 | scm_t_uintmax id; | |
283 | u.p = p; | |
284 | if (sizeof (p) == sizeof (unsigned short)) | |
285 | id = u.us; | |
286 | else if (sizeof (p) == sizeof (unsigned int)) | |
287 | id = u.ui; | |
288 | else if (sizeof (p) == sizeof (unsigned long)) | |
289 | id = u.ul; | |
290 | else | |
291 | id = u.um; | |
292 | ||
d823b11b | 293 | scm_puts ("#<thread ", port); |
23d72566 | 294 | scm_uintprint (id, 10, port); |
1b92fb6b | 295 | scm_puts (" (", port); |
0345e278 | 296 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 297 | scm_puts (")>", port); |
d823b11b MV |
298 | return 1; |
299 | } | |
300 | ||
706846f6 | 301 | \f |
9de87eea | 302 | /*** Blocking on queues. */ |
f7eca35d | 303 | |
9de87eea MV |
304 | /* See also scm_i_queue_async_cell for how such a block is |
305 | interrputed. | |
306 | */ | |
d823b11b | 307 | |
9de87eea MV |
308 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
309 | be woken up by a call to 'unblock_from_queue', or to be | |
310 | interrupted. Upon return of this function, the current thread is | |
311 | no longer on QUEUE, even when the sleep has been interrupted. | |
312 | ||
d2a51087 | 313 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
314 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
315 | ||
316 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
317 | as MUTEX is needed. | |
318 | ||
319 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
320 | ||
321 | The return value of block_self is an errno value. It will be zero | |
322 | when the sleep has been successfully completed by a call to | |
323 | unblock_from_queue, EINTR when it has been interrupted by the | |
324 | delivery of a system async, and ETIMEDOUT when the timeout has | |
325 | expired. | |
326 | ||
327 | The system asyncs themselves are not executed by block_self. | |
328 | */ | |
329 | static int | |
330 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
331 | const scm_t_timespec *waittime) | |
76da80e7 | 332 | { |
9de87eea MV |
333 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
334 | SCM q_handle; | |
335 | int err; | |
336 | ||
337 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
338 | err = EINTR; | |
339 | else | |
340 | { | |
341 | t->block_asyncs++; | |
342 | q_handle = enqueue (queue, t->handle); | |
343 | if (waittime == NULL) | |
344 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
345 | else | |
346 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
347 | ||
348 | /* When we are still on QUEUE, we have been interrupted. We | |
349 | report this only when no other error (such as a timeout) has | |
350 | happened above. | |
351 | */ | |
352 | if (remqueue (queue, q_handle) && err == 0) | |
353 | err = EINTR; | |
354 | t->block_asyncs--; | |
355 | scm_i_reset_sleep (t); | |
356 | } | |
357 | ||
358 | return err; | |
76da80e7 | 359 | } |
9de87eea | 360 | |
d2a51087 NJ |
361 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
362 | returned, or #f if the queue was empty. | |
9de87eea MV |
363 | */ |
364 | static SCM | |
365 | unblock_from_queue (SCM queue) | |
366 | { | |
367 | SCM thread = dequeue (queue); | |
368 | if (scm_is_true (thread)) | |
369 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
370 | return thread; | |
371 | } | |
372 | ||
45f15cac | 373 | \f |
9de87eea MV |
374 | /* Getting into and out of guile mode. |
375 | */ | |
376 | ||
f60a7648 AW |
377 | /* Key used to attach a cleanup handler to a given thread. Also, if |
378 | thread-local storage is unavailable, this key is used to retrieve the | |
379 | current thread with `pthread_getspecific ()'. */ | |
380 | scm_i_pthread_key_t scm_i_thread_key; | |
381 | ||
382 | ||
705edb95 LC |
383 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
384 | ||
385 | /* When thread-local storage (TLS) is available, a pointer to the | |
386 | current-thread object is kept in TLS. Note that storing the thread-object | |
387 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
388 | possible since thread objects may live longer than the actual thread they | |
389 | represent. */ | |
390 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
391 | ||
f60a7648 | 392 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 393 | |
d823b11b | 394 | |
9de87eea MV |
395 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
396 | static scm_i_thread *all_threads = NULL; | |
397 | static int thread_count; | |
398 | ||
399 | static SCM scm_i_default_dynamic_state; | |
400 | ||
401 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 402 | */ |
9de87eea MV |
403 | static void |
404 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 405 | { |
c812243b | 406 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
407 | |
408 | t->pthread = scm_i_pthread_self (); | |
409 | t->handle = SCM_BOOL_F; | |
410 | t->result = SCM_BOOL_F; | |
2e77f720 | 411 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 412 | t->mutexes = SCM_EOL; |
d2a51087 | 413 | t->held_mutex = NULL; |
9de87eea MV |
414 | t->join_queue = SCM_EOL; |
415 | t->dynamic_state = SCM_BOOL_F; | |
416 | t->dynwinds = SCM_EOL; | |
417 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
418 | t->block_asyncs = 1; |
419 | t->pending_asyncs = 1; | |
87f30eda | 420 | t->critical_section_level = 0; |
9de87eea | 421 | t->base = base; |
346e4402 NJ |
422 | #ifdef __ia64__ |
423 | /* Calculate and store off the base of this thread's register | |
424 | backing store (RBS). Unfortunately our implementation(s) of | |
425 | scm_ia64_register_backing_store_base are only reliable for the | |
426 | main thread. For other threads, therefore, find out the current | |
427 | top of the RBS, and use that as a maximum. */ | |
428 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
429 | { | |
430 | ucontext_t ctx; | |
431 | void *bsp; | |
432 | getcontext (&ctx); | |
433 | bsp = scm_ia64_ar_bsp (&ctx); | |
434 | if (t->register_backing_store_base > bsp) | |
435 | t->register_backing_store_base = bsp; | |
436 | } | |
437 | #endif | |
0c97d7dd | 438 | t->continuation_root = SCM_EOL; |
9de87eea MV |
439 | t->continuation_base = base; |
440 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
441 | t->sleep_mutex = NULL; | |
442 | t->sleep_object = SCM_BOOL_F; | |
443 | t->sleep_fd = -1; | |
634aa8de LC |
444 | |
445 | if (pipe (t->sleep_pipe) != 0) | |
446 | /* FIXME: Error conditions during the initialization phase are handled | |
447 | gracelessly since public functions such as `scm_init_guile ()' | |
448 | currently have type `void'. */ | |
449 | abort (); | |
450 | ||
86a597f8 | 451 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
378f2625 LC |
452 | t->current_mark_stack_ptr = NULL; |
453 | t->current_mark_stack_limit = NULL; | |
2e77f720 | 454 | t->canceled = 0; |
9de87eea | 455 | t->exited = 0; |
72e6b608 | 456 | t->guile_mode = 0; |
9de87eea | 457 | |
f60a7648 AW |
458 | scm_i_pthread_setspecific (scm_i_thread_key, t); |
459 | ||
460 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
461 | /* Cache the current thread in TLS for faster lookup. */ | |
462 | scm_i_current_thread = t; | |
463 | #endif | |
9de87eea | 464 | |
9de87eea MV |
465 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
466 | t->next_thread = all_threads; | |
467 | all_threads = t; | |
468 | thread_count++; | |
469 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
470 | } |
471 | ||
9de87eea | 472 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 473 | */ |
9de87eea MV |
474 | static void |
475 | guilify_self_2 (SCM parent) | |
d823b11b | 476 | { |
9de87eea MV |
477 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
478 | ||
72e6b608 LC |
479 | t->guile_mode = 1; |
480 | ||
9de87eea | 481 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 482 | |
9de87eea MV |
483 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
484 | t->continuation_base = t->base; | |
2bbe1533 | 485 | t->vm = SCM_BOOL_F; |
9de87eea MV |
486 | |
487 | if (scm_is_true (parent)) | |
488 | t->dynamic_state = scm_make_dynamic_state (parent); | |
489 | else | |
490 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
491 | ||
492 | t->join_queue = make_queue (); | |
493 | t->block_asyncs = 0; | |
d823b11b MV |
494 | } |
495 | ||
6180e336 NJ |
496 | \f |
497 | /*** Fat mutexes */ | |
498 | ||
499 | /* We implement our own mutex type since we want them to be 'fair', we | |
500 | want to do fancy things while waiting for them (like running | |
501 | asyncs) and we might want to add things that are nice for | |
502 | debugging. | |
503 | */ | |
504 | ||
505 | typedef struct { | |
506 | scm_i_pthread_mutex_t lock; | |
507 | SCM owner; | |
adc085f1 | 508 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 509 | |
adc085f1 | 510 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
511 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
512 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
513 | owned by the current thread? */ | |
514 | ||
515 | SCM waiting; /* the threads waiting for this mutex. */ | |
516 | } fat_mutex; | |
517 | ||
518 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
519 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
520 | ||
9de87eea | 521 | /* Perform thread tear-down, in guile mode. |
d823b11b | 522 | */ |
9de87eea MV |
523 | static void * |
524 | do_thread_exit (void *v) | |
525 | { | |
2e77f720 LC |
526 | scm_i_thread *t = (scm_i_thread *) v; |
527 | ||
528 | if (!scm_is_false (t->cleanup_handler)) | |
529 | { | |
530 | SCM ptr = t->cleanup_handler; | |
531 | ||
532 | t->cleanup_handler = SCM_BOOL_F; | |
533 | t->result = scm_internal_catch (SCM_BOOL_T, | |
534 | (scm_t_catch_body) scm_call_0, ptr, | |
535 | scm_handle_by_message_noexit, NULL); | |
536 | } | |
9de87eea | 537 | |
86a597f8 | 538 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
539 | |
540 | t->exited = 1; | |
0c97d7dd MV |
541 | close (t->sleep_pipe[0]); |
542 | close (t->sleep_pipe[1]); | |
9de87eea MV |
543 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
544 | ; | |
9de87eea | 545 | |
74926120 | 546 | while (!scm_is_null (t->mutexes)) |
6180e336 | 547 | { |
a0faf7dd | 548 | SCM mutex = SCM_WEAK_PAIR_CAR (t->mutexes); |
74926120 | 549 | |
a0faf7dd LC |
550 | if (!SCM_UNBNDP (mutex)) |
551 | { | |
552 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
553 | ||
554 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 LC |
555 | |
556 | /* Since MUTEX is in `t->mutexes', T must be its owner. */ | |
557 | assert (scm_is_eq (m->owner, t->handle)); | |
558 | ||
a0faf7dd | 559 | unblock_from_queue (m->waiting); |
f57fdf07 | 560 | |
a0faf7dd LC |
561 | scm_i_pthread_mutex_unlock (&m->lock); |
562 | } | |
6180e336 | 563 | |
a0faf7dd | 564 | t->mutexes = SCM_WEAK_PAIR_CDR (t->mutexes); |
6180e336 NJ |
565 | } |
566 | ||
86a597f8 | 567 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 568 | |
9de87eea MV |
569 | return NULL; |
570 | } | |
571 | ||
f60a7648 AW |
572 | static void * |
573 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
574 | { | |
575 | void *ret; | |
576 | int registered; | |
577 | ||
578 | registered = GC_register_my_thread (sb); | |
579 | ||
580 | ret = scm_with_guile (do_thread_exit, v); | |
581 | ||
582 | if (registered == GC_SUCCESS) | |
583 | GC_unregister_my_thread (); | |
584 | ||
585 | return ret; | |
586 | } | |
587 | ||
d823b11b | 588 | static void |
9de87eea | 589 | on_thread_exit (void *v) |
d823b11b | 590 | { |
29776e85 | 591 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 592 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 593 | |
d2a51087 NJ |
594 | /* If this thread was cancelled while doing a cond wait, it will |
595 | still have a mutex locked, so we unlock it here. */ | |
596 | if (t->held_mutex) | |
597 | { | |
598 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
599 | t->held_mutex = NULL; | |
600 | } | |
601 | ||
f60a7648 AW |
602 | /* Reinstate the current thread for purposes of scm_with_guile |
603 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
604 | case but it doesn't hurt to be consistent. */ | |
605 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 606 | |
2e77f720 LC |
607 | /* Ensure the signal handling thread has been launched, because we might be |
608 | shutting it down. */ | |
609 | scm_i_ensure_signal_delivery_thread (); | |
610 | ||
0c97d7dd | 611 | /* Unblocking the joining threads needs to happen in guile mode |
f60a7648 AW |
612 | since the queue is a SCM data structure. Trampoline through |
613 | GC_call_with_stack_base so that the GC works even if it already | |
614 | cleaned up for this thread. */ | |
615 | GC_call_with_stack_base (do_thread_exit_trampoline, v); | |
0c97d7dd MV |
616 | |
617 | /* Removing ourself from the list of all threads needs to happen in | |
618 | non-guile mode since all SCM values on our stack become | |
29776e85 | 619 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
620 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
621 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
622 | if (*tp == t) | |
623 | { | |
624 | *tp = t->next_thread; | |
c058db8a LC |
625 | |
626 | /* GC-robust */ | |
627 | t->next_thread = NULL; | |
628 | ||
0c97d7dd MV |
629 | break; |
630 | } | |
631 | thread_count--; | |
2e77f720 LC |
632 | |
633 | /* If there's only one other thread, it could be the signal delivery | |
634 | thread, so we need to notify it to shut down by closing its read pipe. | |
635 | If it's not the signal delivery thread, then closing the read pipe isn't | |
636 | going to hurt. */ | |
637 | if (thread_count <= 1) | |
638 | scm_i_close_signal_pipe (); | |
639 | ||
0c97d7dd MV |
640 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
641 | ||
f60a7648 | 642 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
643 | } |
644 | ||
9de87eea | 645 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 646 | |
9de87eea MV |
647 | static void |
648 | init_thread_key (void) | |
649 | { | |
f60a7648 | 650 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 651 | } |
d823b11b | 652 | |
cde24ce1 AW |
653 | /* Perform any initializations necessary to make the current thread |
654 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
655 | if necessary. | |
a54a94b3 | 656 | |
9de87eea MV |
657 | BASE is the stack base to use with GC. |
658 | ||
659 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
660 | which case the default dynamic state is used. | |
661 | ||
cde24ce1 | 662 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 663 | return 1. |
cde24ce1 AW |
664 | |
665 | Note that it could be the case that the thread was known | |
666 | to Guile, but not in guile mode (because we are within a | |
667 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
668 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
669 | |
670 | static int | |
671 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 672 | { |
9de87eea MV |
673 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
674 | ||
cde24ce1 AW |
675 | if (SCM_I_CURRENT_THREAD) |
676 | { | |
677 | /* Thread is already known to Guile. | |
678 | */ | |
679 | return 0; | |
680 | } | |
681 | else | |
9de87eea MV |
682 | { |
683 | /* This thread has not been guilified yet. | |
684 | */ | |
685 | ||
686 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
687 | if (scm_initialized_p == 0) | |
688 | { | |
689 | /* First thread ever to enter Guile. Run the full | |
690 | initialization. | |
691 | */ | |
692 | scm_i_init_guile (base); | |
693 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
694 | } | |
695 | else | |
696 | { | |
697 | /* Guile is already initialized, but this thread enters it for | |
698 | the first time. Only initialize this thread. | |
699 | */ | |
700 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
701 | guilify_self_1 (base); | |
702 | guilify_self_2 (parent); | |
703 | } | |
704 | return 1; | |
705 | } | |
d823b11b MV |
706 | } |
707 | ||
9de87eea | 708 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 709 | |
534bbcc1 | 710 | #if defined HAVE_PTHREAD_ATTR_GETSTACK && defined HAVE_PTHREAD_GETATTR_NP |
23d72566 KR |
711 | /* This method for GNU/Linux and perhaps some other systems. |
712 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
713 | available on them. */ | |
9de87eea MV |
714 | #define HAVE_GET_THREAD_STACK_BASE |
715 | ||
716 | static SCM_STACKITEM * | |
717 | get_thread_stack_base () | |
d823b11b | 718 | { |
9de87eea MV |
719 | pthread_attr_t attr; |
720 | void *start, *end; | |
721 | size_t size; | |
722 | ||
9de87eea MV |
723 | pthread_getattr_np (pthread_self (), &attr); |
724 | pthread_attr_getstack (&attr, &start, &size); | |
725 | end = (char *)start + size; | |
726 | ||
2b829bbb KR |
727 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
728 | for the main thread, but we can use scm_get_stack_base in that | |
729 | case. | |
730 | */ | |
731 | ||
732 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 733 | if ((void *)&attr < start || (void *)&attr >= end) |
071e0d93 | 734 | return (SCM_STACKITEM *) GC_stackbottom; |
9de87eea | 735 | else |
2b829bbb | 736 | #endif |
9de87eea MV |
737 | { |
738 | #if SCM_STACK_GROWS_UP | |
739 | return start; | |
740 | #else | |
741 | return end; | |
742 | #endif | |
743 | } | |
a54a94b3 MV |
744 | } |
745 | ||
56a3dcd4 | 746 | #elif defined HAVE_PTHREAD_GET_STACKADDR_NP |
23d72566 KR |
747 | /* This method for MacOS X. |
748 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
749 | but as of 2006 there's nothing obvious at apple.com. */ | |
750 | #define HAVE_GET_THREAD_STACK_BASE | |
751 | static SCM_STACKITEM * | |
752 | get_thread_stack_base () | |
753 | { | |
754 | return pthread_get_stackaddr_np (pthread_self ()); | |
755 | } | |
756 | ||
757 | #elif defined (__MINGW32__) | |
758 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
759 | in any thread. We don't like hard-coding the name of a system, but there | |
760 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
761 | work. */ | |
762 | #define HAVE_GET_THREAD_STACK_BASE | |
763 | static SCM_STACKITEM * | |
764 | get_thread_stack_base () | |
765 | { | |
071e0d93 | 766 | return (SCM_STACKITEM *) GC_stackbottom; |
23d72566 KR |
767 | } |
768 | ||
769 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
770 | |
771 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
772 | ||
773 | #define HAVE_GET_THREAD_STACK_BASE | |
774 | ||
775 | static SCM_STACKITEM * | |
776 | get_thread_stack_base () | |
a54a94b3 | 777 | { |
071e0d93 | 778 | return (SCM_STACKITEM *) GC_stackbottom; |
d823b11b MV |
779 | } |
780 | ||
9de87eea | 781 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
782 | |
783 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
784 | ||
785 | void | |
786 | scm_init_guile () | |
d823b11b | 787 | { |
9de87eea MV |
788 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
789 | scm_i_default_dynamic_state); | |
d823b11b MV |
790 | } |
791 | ||
9de87eea MV |
792 | #endif |
793 | ||
794 | void * | |
795 | scm_with_guile (void *(*func)(void *), void *data) | |
796 | { | |
797 | return scm_i_with_guile_and_parent (func, data, | |
798 | scm_i_default_dynamic_state); | |
799 | } | |
800 | ||
70eca635 | 801 | SCM_UNUSED static void |
2e77f720 LC |
802 | scm_leave_guile_cleanup (void *x) |
803 | { | |
47b6e9bd | 804 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
805 | } |
806 | ||
cde24ce1 AW |
807 | struct with_guile_trampoline_args |
808 | { | |
809 | GC_fn_type func; | |
810 | void *data; | |
811 | }; | |
812 | ||
813 | static void * | |
814 | with_guile_trampoline (void *data) | |
815 | { | |
816 | struct with_guile_trampoline_args *args = data; | |
817 | ||
818 | return scm_c_with_continuation_barrier (args->func, args->data); | |
819 | } | |
820 | ||
9de87eea | 821 | void * |
2e77f720 | 822 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
823 | { |
824 | void *res; | |
cde24ce1 AW |
825 | int new_thread; |
826 | scm_i_thread *t; | |
9de87eea | 827 | SCM_STACKITEM base_item; |
2e77f720 | 828 | |
cde24ce1 AW |
829 | new_thread = scm_i_init_thread_for_guile (&base_item, parent); |
830 | t = SCM_I_CURRENT_THREAD; | |
831 | if (new_thread) | |
2e77f720 | 832 | { |
cde24ce1 AW |
833 | /* We are in Guile mode. */ |
834 | assert (t->guile_mode); | |
835 | ||
2e77f720 | 836 | res = scm_c_with_continuation_barrier (func, data); |
cde24ce1 AW |
837 | |
838 | /* Leave Guile mode. */ | |
839 | t->guile_mode = 0; | |
840 | } | |
841 | else if (t->guile_mode) | |
842 | { | |
843 | /* Already in Guile mode. */ | |
844 | res = scm_c_with_continuation_barrier (func, data); | |
2e77f720 | 845 | } |
74926120 | 846 | else |
cde24ce1 AW |
847 | { |
848 | struct with_guile_trampoline_args args; | |
849 | args.func = func; | |
850 | args.data = data; | |
72e6b608 | 851 | |
cde24ce1 AW |
852 | /* We are not in Guile mode, either because we are not within a |
853 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 854 | |
cde24ce1 AW |
855 | This call to scm_with_guile() could happen from anywhere on the |
856 | stack, and in particular lower on the stack than when it was | |
857 | when this thread was first guilified. Thus, `base' must be | |
858 | updated. */ | |
859 | #if SCM_STACK_GROWS_UP | |
860 | if (SCM_STACK_PTR (&base_item) < t->base) | |
861 | t->base = SCM_STACK_PTR (&base_item); | |
862 | #else | |
863 | if (SCM_STACK_PTR (&base_item) > t->base) | |
864 | t->base = SCM_STACK_PTR (&base_item); | |
865 | #endif | |
72e6b608 | 866 | |
cde24ce1 AW |
867 | t->guile_mode = 1; |
868 | res = with_gc_active (with_guile_trampoline, &args); | |
869 | t->guile_mode = 0; | |
870 | } | |
871 | return res; | |
72e6b608 | 872 | } |
3d1af79f | 873 | |
9de87eea MV |
874 | void * |
875 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 876 | { |
72e6b608 | 877 | void *result; |
cde24ce1 | 878 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 879 | |
cde24ce1 | 880 | if (t->guile_mode) |
72e6b608 | 881 | { |
cde24ce1 AW |
882 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
883 | result = with_gc_inactive (func, data); | |
884 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
72e6b608 LC |
885 | } |
886 | else | |
cde24ce1 | 887 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
888 | result = func (data); |
889 | ||
890 | return result; | |
9de87eea MV |
891 | } |
892 | ||
72e6b608 | 893 | \f |
9de87eea MV |
894 | /*** Thread creation */ |
895 | ||
896 | typedef struct { | |
897 | SCM parent; | |
898 | SCM thunk; | |
899 | SCM handler; | |
76da80e7 | 900 | SCM thread; |
9de87eea MV |
901 | scm_i_pthread_mutex_t mutex; |
902 | scm_i_pthread_cond_t cond; | |
903 | } launch_data; | |
d823b11b | 904 | |
9de87eea MV |
905 | static void * |
906 | really_launch (void *d) | |
907 | { | |
908 | launch_data *data = (launch_data *)d; | |
909 | SCM thunk = data->thunk, handler = data->handler; | |
910 | scm_i_thread *t; | |
d823b11b | 911 | |
9de87eea | 912 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 913 | |
9de87eea MV |
914 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
915 | data->thread = scm_current_thread (); | |
916 | scm_i_pthread_cond_signal (&data->cond); | |
917 | scm_i_pthread_mutex_unlock (&data->mutex); | |
918 | ||
919 | if (SCM_UNBNDP (handler)) | |
920 | t->result = scm_call_0 (thunk); | |
921 | else | |
922 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
923 | ||
924 | return 0; | |
d823b11b MV |
925 | } |
926 | ||
9de87eea MV |
927 | static void * |
928 | launch_thread (void *d) | |
929 | { | |
930 | launch_data *data = (launch_data *)d; | |
931 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
932 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
933 | return NULL; | |
934 | } | |
935 | ||
936 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 937 | (SCM thunk, SCM handler), |
9de87eea MV |
938 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
939 | "returning a new thread object representing the thread. The procedure\n" | |
940 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
941 | "\n" | |
942 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
943 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
944 | "handler. This catch is established inside the continuation barrier.\n" | |
945 | "\n" | |
946 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
947 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
948 | #define FUNC_NAME s_scm_call_with_new_thread |
949 | { | |
9de87eea MV |
950 | launch_data data; |
951 | scm_i_pthread_t id; | |
952 | int err; | |
d823b11b | 953 | |
9de87eea MV |
954 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
955 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
956 | handler, SCM_ARG2, FUNC_NAME); | |
957 | ||
958 | data.parent = scm_current_dynamic_state (); | |
959 | data.thunk = thunk; | |
960 | data.handler = handler; | |
961 | data.thread = SCM_BOOL_F; | |
962 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
963 | scm_i_pthread_cond_init (&data.cond, NULL); | |
964 | ||
965 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
966 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
967 | if (err) | |
968 | { | |
969 | scm_i_pthread_mutex_unlock (&data.mutex); | |
970 | errno = err; | |
971 | scm_syserror (NULL); | |
972 | } | |
973 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
974 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 975 | |
9de87eea | 976 | return data.thread; |
d823b11b MV |
977 | } |
978 | #undef FUNC_NAME | |
979 | ||
9de87eea MV |
980 | typedef struct { |
981 | SCM parent; | |
982 | scm_t_catch_body body; | |
983 | void *body_data; | |
984 | scm_t_catch_handler handler; | |
985 | void *handler_data; | |
986 | SCM thread; | |
987 | scm_i_pthread_mutex_t mutex; | |
988 | scm_i_pthread_cond_t cond; | |
989 | } spawn_data; | |
990 | ||
991 | static void * | |
992 | really_spawn (void *d) | |
993 | { | |
994 | spawn_data *data = (spawn_data *)d; | |
995 | scm_t_catch_body body = data->body; | |
996 | void *body_data = data->body_data; | |
997 | scm_t_catch_handler handler = data->handler; | |
998 | void *handler_data = data->handler_data; | |
999 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1000 | ||
1001 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1002 | data->thread = scm_current_thread (); | |
1003 | scm_i_pthread_cond_signal (&data->cond); | |
1004 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1005 | ||
1006 | if (handler == NULL) | |
1007 | t->result = body (body_data); | |
1008 | else | |
1009 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1010 | body, body_data, | |
1011 | handler, handler_data); | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static void * | |
1017 | spawn_thread (void *d) | |
1018 | { | |
1019 | spawn_data *data = (spawn_data *)d; | |
1020 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1021 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1022 | return NULL; | |
1023 | } | |
1024 | ||
1025 | SCM | |
1026 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1027 | scm_t_catch_handler handler, void *handler_data) | |
1028 | { | |
1029 | spawn_data data; | |
1030 | scm_i_pthread_t id; | |
1031 | int err; | |
1032 | ||
1033 | data.parent = scm_current_dynamic_state (); | |
1034 | data.body = body; | |
1035 | data.body_data = body_data; | |
1036 | data.handler = handler; | |
1037 | data.handler_data = handler_data; | |
1038 | data.thread = SCM_BOOL_F; | |
1039 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1040 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1041 | ||
1042 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1043 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1044 | if (err) | |
1045 | { | |
1046 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1047 | errno = err; | |
1048 | scm_syserror (NULL); | |
1049 | } | |
1050 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1051 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1052 | |
9de87eea MV |
1053 | return data.thread; |
1054 | } | |
1055 | ||
29717c89 MD |
1056 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1057 | (), | |
1058 | "Move the calling thread to the end of the scheduling queue.") | |
1059 | #define FUNC_NAME s_scm_yield | |
1060 | { | |
9de87eea | 1061 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1062 | } |
1063 | #undef FUNC_NAME | |
1064 | ||
2e77f720 LC |
1065 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1066 | (SCM thread), | |
1067 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1068 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1069 | "been signaled to terminate, this function is a no-op.") | |
1070 | #define FUNC_NAME s_scm_cancel_thread | |
1071 | { | |
1072 | scm_i_thread *t = NULL; | |
1073 | ||
1074 | SCM_VALIDATE_THREAD (1, thread); | |
1075 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1076 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1077 | if (!t->canceled) |
1078 | { | |
1079 | t->canceled = 1; | |
86a597f8 | 1080 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1081 | scm_i_pthread_cancel (t->pthread); |
1082 | } | |
1083 | else | |
86a597f8 | 1084 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1085 | |
1086 | return SCM_UNSPECIFIED; | |
1087 | } | |
1088 | #undef FUNC_NAME | |
1089 | ||
1090 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1091 | (SCM thread, SCM proc), | |
1092 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1093 | "This handler will be called when the thread exits.") | |
1094 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1095 | { | |
1096 | scm_i_thread *t; | |
1097 | ||
1098 | SCM_VALIDATE_THREAD (1, thread); | |
1099 | if (!scm_is_false (proc)) | |
1100 | SCM_VALIDATE_THUNK (2, proc); | |
1101 | ||
2e77f720 | 1102 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1103 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1104 | ||
2e77f720 LC |
1105 | if (!(t->exited || t->canceled)) |
1106 | t->cleanup_handler = proc; | |
1107 | ||
86a597f8 | 1108 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1109 | |
1110 | return SCM_UNSPECIFIED; | |
1111 | } | |
1112 | #undef FUNC_NAME | |
1113 | ||
1114 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1115 | (SCM thread), | |
1116 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1117 | #define FUNC_NAME s_scm_thread_cleanup | |
1118 | { | |
1119 | scm_i_thread *t; | |
1120 | SCM ret; | |
1121 | ||
1122 | SCM_VALIDATE_THREAD (1, thread); | |
1123 | ||
2e77f720 | 1124 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1125 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1126 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1127 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1128 | |
1129 | return ret; | |
1130 | } | |
1131 | #undef FUNC_NAME | |
1132 | ||
6180e336 NJ |
1133 | SCM scm_join_thread (SCM thread) |
1134 | { | |
1135 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1136 | } | |
1137 | ||
1138 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1139 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1140 | "Suspend execution of the calling thread until the target @var{thread} " |
1141 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1142 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1143 | { |
9de87eea | 1144 | scm_i_thread *t; |
6180e336 NJ |
1145 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1146 | SCM res = SCM_BOOL_F; | |
1147 | ||
1148 | if (! (SCM_UNBNDP (timeoutval))) | |
1149 | res = timeoutval; | |
d823b11b MV |
1150 | |
1151 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1152 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1153 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1154 | |
9de87eea | 1155 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1156 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1157 | ||
6180e336 NJ |
1158 | if (! SCM_UNBNDP (timeout)) |
1159 | { | |
1160 | to_timespec (timeout, &ctimeout); | |
1161 | timeout_ptr = &ctimeout; | |
1162 | } | |
1163 | ||
1164 | if (t->exited) | |
1165 | res = t->result; | |
1166 | else | |
d823b11b | 1167 | { |
9de87eea MV |
1168 | while (1) |
1169 | { | |
74926120 | 1170 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1171 | timeout_ptr); |
1172 | if (err == 0) | |
1173 | { | |
1174 | if (t->exited) | |
1175 | { | |
1176 | res = t->result; | |
1177 | break; | |
1178 | } | |
1179 | } | |
1180 | else if (err == ETIMEDOUT) | |
9de87eea | 1181 | break; |
6180e336 | 1182 | |
86a597f8 | 1183 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1184 | SCM_TICK; |
86a597f8 | 1185 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1186 | |
1187 | /* Check for exit again, since we just released and | |
1188 | reacquired the admin mutex, before the next block_self | |
1189 | call (which would block forever if t has already | |
1190 | exited). */ | |
1191 | if (t->exited) | |
1192 | { | |
1193 | res = t->result; | |
1194 | break; | |
1195 | } | |
9de87eea | 1196 | } |
d823b11b | 1197 | } |
9de87eea | 1198 | |
86a597f8 | 1199 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1200 | |
d823b11b | 1201 | return res; |
5f05c406 MV |
1202 | } |
1203 | #undef FUNC_NAME | |
1204 | ||
6180e336 NJ |
1205 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1206 | (SCM obj), | |
1207 | "Return @code{#t} if @var{obj} is a thread.") | |
1208 | #define FUNC_NAME s_scm_thread_p | |
1209 | { | |
1210 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1211 | } | |
1212 | #undef FUNC_NAME | |
5f05c406 | 1213 | |
4079f87e | 1214 | |
9de87eea MV |
1215 | static size_t |
1216 | fat_mutex_free (SCM mx) | |
76da80e7 | 1217 | { |
9de87eea MV |
1218 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1219 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | static int | |
9de87eea | 1224 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1225 | { |
9de87eea MV |
1226 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1227 | scm_puts ("#<mutex ", port); | |
1228 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1229 | scm_puts (">", port); | |
1230 | return 1; | |
76da80e7 MV |
1231 | } |
1232 | ||
76da80e7 | 1233 | static SCM |
6180e336 | 1234 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1235 | { |
9de87eea MV |
1236 | fat_mutex *m; |
1237 | SCM mx; | |
1238 | ||
1239 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1240 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1241 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1242 | m->level = 0; |
6180e336 | 1243 | |
adc085f1 | 1244 | m->recursive = recursive; |
6180e336 NJ |
1245 | m->unchecked_unlock = unchecked_unlock; |
1246 | m->allow_external_unlock = external_unlock; | |
1247 | ||
9de87eea MV |
1248 | m->waiting = SCM_EOL; |
1249 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1250 | m->waiting = make_queue (); | |
1251 | return mx; | |
76da80e7 MV |
1252 | } |
1253 | ||
6180e336 NJ |
1254 | SCM scm_make_mutex (void) |
1255 | { | |
1256 | return scm_make_mutex_with_flags (SCM_EOL); | |
1257 | } | |
1258 | ||
2a1d0688 NJ |
1259 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1260 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1261 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1262 | |
1263 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1264 | (SCM flags), | |
9de87eea | 1265 | "Create a new mutex. ") |
6180e336 | 1266 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1267 | { |
6180e336 NJ |
1268 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1269 | ||
1270 | SCM ptr = flags; | |
1271 | while (! scm_is_null (ptr)) | |
1272 | { | |
1273 | SCM flag = SCM_CAR (ptr); | |
1274 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1275 | unchecked_unlock = 1; | |
1276 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1277 | external_unlock = 1; | |
1278 | else if (scm_is_eq (flag, recursive_sym)) | |
1279 | recursive = 1; | |
74926120 | 1280 | else |
2a1d0688 | 1281 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1282 | ptr = SCM_CDR (ptr); |
1283 | } | |
1284 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1285 | } |
1286 | #undef FUNC_NAME | |
1287 | ||
9de87eea | 1288 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1289 | (void), |
9de87eea MV |
1290 | "Create a new recursive mutex. ") |
1291 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1292 | { |
6180e336 | 1293 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1294 | } |
1295 | #undef FUNC_NAME | |
1296 | ||
6180e336 NJ |
1297 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1298 | ||
1299 | static SCM | |
adc085f1 | 1300 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1301 | { |
1302 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1303 | |
adc085f1 | 1304 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1305 | SCM err = SCM_BOOL_F; |
1306 | ||
1307 | struct timeval current_time; | |
9de87eea MV |
1308 | |
1309 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1310 | |
1311 | while (1) | |
9de87eea | 1312 | { |
adc085f1 | 1313 | if (m->level == 0) |
6180e336 | 1314 | { |
adc085f1 | 1315 | m->owner = new_owner; |
6180e336 | 1316 | m->level++; |
74926120 | 1317 | |
adc085f1 | 1318 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1319 | { |
adc085f1 | 1320 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 | 1321 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1322 | |
1323 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1324 | retained when not referenced elsewhere (bug #27450). |
1325 | The weak pair itself is eventually removed when MUTEX | |
1326 | is unlocked. Note that `t->mutexes' lists mutexes | |
1327 | currently held by T, so it should be small. */ | |
a0faf7dd LC |
1328 | t->mutexes = scm_weak_car_pair (mutex, t->mutexes); |
1329 | ||
6180e336 | 1330 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1331 | } |
adc085f1 JG |
1332 | *ret = 1; |
1333 | break; | |
1334 | } | |
1335 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1336 | { | |
1337 | m->owner = new_owner; | |
1338 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1339 | scm_from_locale_string ("lock obtained on abandoned " | |
1340 | "mutex")); | |
1341 | *ret = 1; | |
1342 | break; | |
1343 | } | |
1344 | else if (scm_is_eq (m->owner, new_owner)) | |
1345 | { | |
1346 | if (m->recursive) | |
1347 | { | |
1348 | m->level++; | |
74926120 | 1349 | *ret = 1; |
adc085f1 JG |
1350 | } |
1351 | else | |
6180e336 | 1352 | { |
adc085f1 JG |
1353 | err = scm_cons (scm_misc_error_key, |
1354 | scm_from_locale_string ("mutex already locked " | |
1355 | "by thread")); | |
1356 | *ret = 0; | |
1357 | } | |
74926120 | 1358 | break; |
adc085f1 | 1359 | } |
9de87eea | 1360 | else |
9de87eea | 1361 | { |
74926120 | 1362 | if (timeout != NULL) |
adc085f1 JG |
1363 | { |
1364 | gettimeofday (¤t_time, NULL); | |
1365 | if (current_time.tv_sec > timeout->tv_sec || | |
1366 | (current_time.tv_sec == timeout->tv_sec && | |
1367 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1368 | { |
adc085f1 JG |
1369 | *ret = 0; |
1370 | break; | |
6180e336 | 1371 | } |
6180e336 | 1372 | } |
37a52039 | 1373 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1374 | scm_i_pthread_mutex_unlock (&m->lock); |
1375 | SCM_TICK; | |
1376 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1377 | } | |
1378 | } | |
1379 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1380 | return err; |
9de87eea MV |
1381 | } |
1382 | ||
6180e336 NJ |
1383 | SCM scm_lock_mutex (SCM mx) |
1384 | { | |
adc085f1 | 1385 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1386 | } |
1387 | ||
adc085f1 JG |
1388 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1389 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1390 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1391 | "blocks until the mutex becomes available. The function returns when " | |
1392 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1393 | "a thread already owns will succeed right away and will not block the " | |
1394 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1395 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1396 | { |
6180e336 NJ |
1397 | SCM exception; |
1398 | int ret = 0; | |
1399 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1400 | |
6180e336 NJ |
1401 | SCM_VALIDATE_MUTEX (1, m); |
1402 | ||
1403 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1404 | { | |
1405 | to_timespec (timeout, &cwaittime); | |
1406 | waittime = &cwaittime; | |
1407 | } | |
1408 | ||
adc085f1 | 1409 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1410 | if (!scm_is_false (exception)) |
1411 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1412 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1413 | } |
76da80e7 | 1414 | #undef FUNC_NAME |
9bc4701c | 1415 | |
a4d106c7 | 1416 | void |
661ae7ab | 1417 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1418 | { |
661ae7ab MV |
1419 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1420 | SCM_F_WIND_EXPLICITLY); | |
1421 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1422 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1423 | } |
1424 | ||
9bc4701c | 1425 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1426 | (SCM mutex), |
9bc4701c MD |
1427 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1428 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1429 | #define FUNC_NAME s_scm_try_mutex | |
1430 | { | |
6180e336 NJ |
1431 | SCM exception; |
1432 | int ret = 0; | |
1433 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1434 | |
ba1b7223 | 1435 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1436 | |
1437 | to_timespec (scm_from_int(0), &cwaittime); | |
1438 | waittime = &cwaittime; | |
74926120 | 1439 | |
adc085f1 | 1440 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1441 | if (!scm_is_false (exception)) |
1442 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1443 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1444 | } |
1445 | #undef FUNC_NAME | |
76da80e7 | 1446 | |
6180e336 NJ |
1447 | /*** Fat condition variables */ |
1448 | ||
1449 | typedef struct { | |
1450 | scm_i_pthread_mutex_t lock; | |
1451 | SCM waiting; /* the threads waiting for this condition. */ | |
1452 | } fat_cond; | |
1453 | ||
1454 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1455 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1456 | ||
1457 | static int | |
1458 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1459 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1460 | { |
7f991c7d | 1461 | SCM owner; |
6180e336 NJ |
1462 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1463 | fat_cond *c = NULL; | |
1464 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1465 | int err = 0, ret = 0; | |
9de87eea MV |
1466 | |
1467 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1468 | |
7f991c7d | 1469 | owner = m->owner; |
adc085f1 | 1470 | |
d31ae2c3 | 1471 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1472 | { |
adc085f1 | 1473 | if (m->level == 0) |
6180e336 NJ |
1474 | { |
1475 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1476 | { |
1477 | scm_i_pthread_mutex_unlock (&m->lock); | |
1478 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1479 | } | |
d31ae2c3 | 1480 | owner = t->handle; |
6180e336 NJ |
1481 | } |
1482 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1483 | { |
1484 | scm_i_pthread_mutex_unlock (&m->lock); | |
1485 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1486 | } | |
6180e336 NJ |
1487 | } |
1488 | ||
1489 | if (! (SCM_UNBNDP (cond))) | |
1490 | { | |
6180e336 NJ |
1491 | c = SCM_CONDVAR_DATA (cond); |
1492 | while (1) | |
1493 | { | |
1494 | int brk = 0; | |
1495 | ||
6180e336 NJ |
1496 | if (m->level > 0) |
1497 | m->level--; | |
adc085f1 | 1498 | if (m->level == 0) |
f57fdf07 LC |
1499 | { |
1500 | /* Change the owner of MUTEX. */ | |
1501 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1502 | m->owner = unblock_from_queue (m->waiting); | |
1503 | } | |
adc085f1 | 1504 | |
6180e336 | 1505 | t->block_asyncs++; |
74926120 | 1506 | |
d2a51087 NJ |
1507 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1508 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1509 | |
1510 | if (err == 0) | |
1511 | { | |
1512 | ret = 1; | |
1513 | brk = 1; | |
1514 | } | |
1515 | else if (err == ETIMEDOUT) | |
1516 | { | |
1517 | ret = 0; | |
1518 | brk = 1; | |
1519 | } | |
1520 | else if (err != EINTR) | |
74926120 | 1521 | { |
6180e336 | 1522 | errno = err; |
6180e336 | 1523 | scm_syserror (NULL); |
74926120 | 1524 | } |
6180e336 NJ |
1525 | |
1526 | if (brk) | |
1527 | { | |
1528 | if (relock) | |
adc085f1 | 1529 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1530 | t->block_asyncs--; |
6180e336 NJ |
1531 | break; |
1532 | } | |
74926120 | 1533 | |
6180e336 NJ |
1534 | t->block_asyncs--; |
1535 | scm_async_click (); | |
74926120 | 1536 | |
6180e336 NJ |
1537 | scm_remember_upto_here_2 (cond, mutex); |
1538 | ||
1539 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1540 | } | |
9bc4701c | 1541 | } |
9de87eea | 1542 | else |
6180e336 NJ |
1543 | { |
1544 | if (m->level > 0) | |
1545 | m->level--; | |
74926120 | 1546 | if (m->level == 0) |
f57fdf07 LC |
1547 | { |
1548 | /* Change the owner of MUTEX. */ | |
1549 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1550 | m->owner = unblock_from_queue (m->waiting); | |
1551 | } | |
74926120 | 1552 | |
6180e336 NJ |
1553 | scm_i_pthread_mutex_unlock (&m->lock); |
1554 | ret = 1; | |
1555 | } | |
9de87eea | 1556 | |
6180e336 | 1557 | return ret; |
9bc4701c | 1558 | } |
9bc4701c | 1559 | |
6180e336 NJ |
1560 | SCM scm_unlock_mutex (SCM mx) |
1561 | { | |
1562 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1563 | } |
9bc4701c | 1564 | |
6180e336 NJ |
1565 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1566 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1567 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1568 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1569 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1570 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1571 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1572 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1573 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1574 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1575 | { |
6180e336 NJ |
1576 | scm_t_timespec cwaittime, *waittime = NULL; |
1577 | ||
9bc4701c | 1578 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1579 | if (! (SCM_UNBNDP (cond))) |
1580 | { | |
1581 | SCM_VALIDATE_CONDVAR (2, cond); | |
1582 | ||
1583 | if (! (SCM_UNBNDP (timeout))) | |
1584 | { | |
1585 | to_timespec (timeout, &cwaittime); | |
1586 | waittime = &cwaittime; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1591 | } |
1592 | #undef FUNC_NAME | |
1593 | ||
6180e336 NJ |
1594 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1595 | (SCM obj), | |
1596 | "Return @code{#t} if @var{obj} is a mutex.") | |
1597 | #define FUNC_NAME s_scm_mutex_p | |
1598 | { | |
1599 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1600 | } | |
74926120 | 1601 | #undef FUNC_NAME |
9de87eea MV |
1602 | |
1603 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1604 | (SCM mx), | |
1605 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1606 | #define FUNC_NAME s_scm_mutex_owner | |
1607 | { | |
adc085f1 JG |
1608 | SCM owner; |
1609 | fat_mutex *m = NULL; | |
1610 | ||
9de87eea | 1611 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1612 | m = SCM_MUTEX_DATA (mx); |
1613 | scm_i_pthread_mutex_lock (&m->lock); | |
1614 | owner = m->owner; | |
1615 | scm_i_pthread_mutex_unlock (&m->lock); | |
1616 | ||
1617 | return owner; | |
9de87eea MV |
1618 | } |
1619 | #undef FUNC_NAME | |
1620 | ||
1621 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1622 | (SCM mx), | |
adc085f1 | 1623 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1624 | #define FUNC_NAME s_scm_mutex_level |
1625 | { | |
1626 | SCM_VALIDATE_MUTEX (1, mx); | |
1627 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1628 | } | |
1629 | #undef FUNC_NAME | |
1630 | ||
adc085f1 JG |
1631 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1632 | (SCM mx), | |
1633 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1634 | #define FUNC_NAME s_scm_mutex_locked_p | |
1635 | { | |
1636 | SCM_VALIDATE_MUTEX (1, mx); | |
1637 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1638 | } | |
1639 | #undef FUNC_NAME | |
9de87eea | 1640 | |
9de87eea MV |
1641 | static int |
1642 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1643 | { | |
1644 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1645 | scm_puts ("#<condition-variable ", port); | |
1646 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1647 | scm_puts (">", port); | |
1648 | return 1; | |
1649 | } | |
9bc4701c | 1650 | |
d823b11b MV |
1651 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1652 | (void), | |
1653 | "Make a new condition variable.") | |
1654 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1655 | { |
9de87eea MV |
1656 | fat_cond *c; |
1657 | SCM cv; | |
1658 | ||
1659 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1660 | c->waiting = SCM_EOL; |
1661 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1662 | c->waiting = make_queue (); | |
d823b11b | 1663 | return cv; |
5f05c406 | 1664 | } |
d823b11b | 1665 | #undef FUNC_NAME |
5f05c406 | 1666 | |
d823b11b MV |
1667 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1668 | (SCM cv, SCM mx, SCM t), | |
1669 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1670 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1671 | "is locked again when this function returns. When @var{time} is given, " | |
1672 | "it specifies a point in time where the waiting should be aborted. It " | |
1673 | "can be either a integer as returned by @code{current-time} or a pair " | |
1674 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1675 | "mutex is locked and @code{#f} is returned. When the condition " | |
1676 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1677 | "is returned. ") | |
1678 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1679 | { |
9de87eea | 1680 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1681 | |
1682 | SCM_VALIDATE_CONDVAR (1, cv); | |
1683 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1684 | |
d823b11b MV |
1685 | if (!SCM_UNBNDP (t)) |
1686 | { | |
6180e336 | 1687 | to_timespec (t, &waittime); |
9de87eea | 1688 | waitptr = &waittime; |
d823b11b MV |
1689 | } |
1690 | ||
2a1d0688 | 1691 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1692 | } |
d823b11b | 1693 | #undef FUNC_NAME |
5f05c406 | 1694 | |
9de87eea MV |
1695 | static void |
1696 | fat_cond_signal (fat_cond *c) | |
1697 | { | |
9de87eea | 1698 | unblock_from_queue (c->waiting); |
9de87eea MV |
1699 | } |
1700 | ||
d823b11b MV |
1701 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1702 | (SCM cv), | |
1703 | "Wake up one thread that is waiting for @var{cv}") | |
1704 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1705 | { |
d823b11b | 1706 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1707 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1708 | return SCM_BOOL_T; |
5f05c406 | 1709 | } |
d823b11b | 1710 | #undef FUNC_NAME |
5f05c406 | 1711 | |
9de87eea MV |
1712 | static void |
1713 | fat_cond_broadcast (fat_cond *c) | |
1714 | { | |
9de87eea MV |
1715 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1716 | ; | |
9de87eea MV |
1717 | } |
1718 | ||
d823b11b MV |
1719 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1720 | (SCM cv), | |
1721 | "Wake up all threads that are waiting for @var{cv}. ") | |
1722 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1723 | { |
d823b11b | 1724 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1725 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1726 | return SCM_BOOL_T; |
5f05c406 | 1727 | } |
d823b11b | 1728 | #undef FUNC_NAME |
5f05c406 | 1729 | |
6180e336 NJ |
1730 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1731 | (SCM obj), | |
1732 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1733 | #define FUNC_NAME s_scm_condition_variable_p | |
1734 | { | |
1735 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1736 | } | |
1737 | #undef FUNC_NAME | |
1738 | ||
6087fad9 | 1739 | |
8c2b3143 | 1740 | \f |
d823b11b MV |
1741 | /*** Select */ |
1742 | ||
8c2b3143 LC |
1743 | struct select_args |
1744 | { | |
1745 | int nfds; | |
1746 | SELECT_TYPE *read_fds; | |
1747 | SELECT_TYPE *write_fds; | |
1748 | SELECT_TYPE *except_fds; | |
1749 | struct timeval *timeout; | |
1750 | ||
1751 | int result; | |
1752 | int errno_value; | |
1753 | }; | |
1754 | ||
1755 | static void * | |
1756 | do_std_select (void *args) | |
1757 | { | |
1758 | struct select_args *select_args; | |
1759 | ||
1760 | select_args = (struct select_args *) args; | |
1761 | ||
1762 | select_args->result = | |
1763 | select (select_args->nfds, | |
1764 | select_args->read_fds, select_args->write_fds, | |
1765 | select_args->except_fds, select_args->timeout); | |
1766 | select_args->errno_value = errno; | |
1767 | ||
1768 | return NULL; | |
1769 | } | |
1770 | ||
911782b7 | 1771 | int |
9de87eea MV |
1772 | scm_std_select (int nfds, |
1773 | SELECT_TYPE *readfds, | |
1774 | SELECT_TYPE *writefds, | |
1775 | SELECT_TYPE *exceptfds, | |
1776 | struct timeval *timeout) | |
1777 | { | |
1778 | fd_set my_readfds; | |
1779 | int res, eno, wakeup_fd; | |
1780 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1781 | struct select_args args; |
9de87eea MV |
1782 | |
1783 | if (readfds == NULL) | |
1784 | { | |
1785 | FD_ZERO (&my_readfds); | |
1786 | readfds = &my_readfds; | |
1787 | } | |
1788 | ||
1789 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1790 | SCM_TICK; | |
1791 | ||
1792 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1793 | FD_SET (wakeup_fd, readfds); |
1794 | if (wakeup_fd >= nfds) | |
1795 | nfds = wakeup_fd+1; | |
9de87eea | 1796 | |
8c2b3143 LC |
1797 | args.nfds = nfds; |
1798 | args.read_fds = readfds; | |
1799 | args.write_fds = writefds; | |
1800 | args.except_fds = exceptfds; | |
1801 | args.timeout = timeout; | |
1802 | ||
1803 | /* Explicitly cooperate with the GC. */ | |
1804 | scm_without_guile (do_std_select, &args); | |
1805 | ||
1806 | res = args.result; | |
1807 | eno = args.errno_value; | |
1808 | ||
1809 | t->sleep_fd = -1; | |
9de87eea MV |
1810 | scm_i_reset_sleep (t); |
1811 | ||
1812 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1813 | { | |
1814 | char dummy; | |
634aa8de LC |
1815 | full_read (wakeup_fd, &dummy, 1); |
1816 | ||
9de87eea MV |
1817 | FD_CLR (wakeup_fd, readfds); |
1818 | res -= 1; | |
1819 | if (res == 0) | |
1820 | { | |
1821 | eno = EINTR; | |
1822 | res = -1; | |
1823 | } | |
1824 | } | |
d823b11b MV |
1825 | errno = eno; |
1826 | return res; | |
5f05c406 MV |
1827 | } |
1828 | ||
9de87eea | 1829 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1830 | |
9de87eea | 1831 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1832 | |
2956b071 LC |
1833 | /* It seems reasonable to not run procedures related to mutex and condition |
1834 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1835 | without it, and (ii) the only potential gain would be GC latency. See | |
1836 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1837 | for a discussion of the pros and cons. */ | |
1838 | ||
9bc4701c | 1839 | int |
9de87eea | 1840 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1841 | { |
9de87eea | 1842 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1843 | return res; |
1844 | } | |
1845 | ||
9de87eea | 1846 | static void |
2b829bbb | 1847 | do_unlock (void *data) |
28d52ebb | 1848 | { |
9de87eea | 1849 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1850 | } |
1851 | ||
1852 | void | |
661ae7ab | 1853 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1854 | { |
9de87eea | 1855 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1856 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1857 | } |
1858 | ||
9bc4701c | 1859 | int |
9de87eea | 1860 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1861 | { |
4cf72f0b LC |
1862 | int res; |
1863 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1864 | ||
1865 | t->held_mutex = mutex; | |
1866 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1867 | t->held_mutex = NULL; | |
1868 | ||
9bc4701c MD |
1869 | return res; |
1870 | } | |
9bc4701c | 1871 | |
76da80e7 | 1872 | int |
9de87eea MV |
1873 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1874 | scm_i_pthread_mutex_t *mutex, | |
1875 | const scm_t_timespec *wt) | |
76da80e7 | 1876 | { |
4cf72f0b LC |
1877 | int res; |
1878 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1879 | ||
1880 | t->held_mutex = mutex; | |
1881 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1882 | t->held_mutex = NULL; | |
1883 | ||
9de87eea | 1884 | return res; |
76da80e7 MV |
1885 | } |
1886 | ||
9de87eea | 1887 | #endif |
76da80e7 | 1888 | |
d823b11b | 1889 | unsigned long |
9de87eea | 1890 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1891 | { |
d823b11b MV |
1892 | struct timeval tv; |
1893 | tv.tv_usec = usecs % 1000000; | |
1894 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1895 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1896 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1897 | } |
1898 | ||
9de87eea MV |
1899 | unsigned int |
1900 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1901 | { |
d823b11b MV |
1902 | struct timeval tv; |
1903 | tv.tv_usec = 0; | |
1904 | tv.tv_sec = secs; | |
9de87eea | 1905 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1906 | return tv.tv_sec; |
6c214b62 MD |
1907 | } |
1908 | ||
d823b11b MV |
1909 | /*** Misc */ |
1910 | ||
1911 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1912 | (void), | |
1913 | "Return the thread that called this function.") | |
1914 | #define FUNC_NAME s_scm_current_thread | |
1915 | { | |
9de87eea | 1916 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1917 | } |
1918 | #undef FUNC_NAME | |
1919 | ||
9de87eea MV |
1920 | static SCM |
1921 | scm_c_make_list (size_t n, SCM fill) | |
1922 | { | |
1923 | SCM res = SCM_EOL; | |
1924 | while (n-- > 0) | |
1925 | res = scm_cons (fill, res); | |
1926 | return res; | |
1927 | } | |
1928 | ||
d823b11b MV |
1929 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1930 | (void), | |
1931 | "Return a list of all threads.") | |
9bc4701c | 1932 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1933 | { |
9de87eea MV |
1934 | /* We can not allocate while holding the thread_admin_mutex because |
1935 | of the way GC is done. | |
1936 | */ | |
1937 | int n = thread_count; | |
1938 | scm_i_thread *t; | |
1939 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1940 | |
9de87eea MV |
1941 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1942 | l = &list; | |
1943 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1944 | { | |
2e77f720 LC |
1945 | if (t != scm_i_signal_delivery_thread) |
1946 | { | |
1947 | SCM_SETCAR (*l, t->handle); | |
1948 | l = SCM_CDRLOC (*l); | |
1949 | } | |
9de87eea MV |
1950 | n--; |
1951 | } | |
1952 | *l = SCM_EOL; | |
1953 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1954 | return list; | |
d823b11b | 1955 | } |
9de87eea | 1956 | #undef FUNC_NAME |
d823b11b MV |
1957 | |
1958 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1959 | (SCM thread), | |
1960 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1961 | #define FUNC_NAME s_scm_thread_exited_p | |
1962 | { | |
7888309b | 1963 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1964 | } |
1965 | #undef FUNC_NAME | |
1966 | ||
911782b7 | 1967 | int |
d823b11b MV |
1968 | scm_c_thread_exited_p (SCM thread) |
1969 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1970 | { |
9de87eea | 1971 | scm_i_thread *t; |
d823b11b | 1972 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1973 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1974 | return t->exited; |
5f05c406 | 1975 | } |
d823b11b | 1976 | #undef FUNC_NAME |
5f05c406 | 1977 | |
9de87eea | 1978 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
1979 | static int threads_initialized_p = 0; |
1980 | ||
9bc4701c | 1981 | |
a4d106c7 MV |
1982 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1983 | */ | |
d1138028 | 1984 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 1985 | |
661ae7ab | 1986 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1987 | |
9bc4701c | 1988 | void |
661ae7ab | 1989 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1990 | { |
a4d106c7 | 1991 | if (scm_is_false (mutex)) |
661ae7ab MV |
1992 | mutex = dynwind_critical_section_mutex; |
1993 | scm_dynwind_lock_mutex (mutex); | |
1994 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1995 | } |
1996 | ||
1997 | /*** Initialization */ | |
1998 | ||
9de87eea MV |
1999 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2000 | ||
d1138028 MV |
2001 | #if SCM_USE_PTHREAD_THREADS |
2002 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2003 | #endif | |
2004 | ||
9de87eea MV |
2005 | void |
2006 | scm_threads_prehistory (SCM_STACKITEM *base) | |
2007 | { | |
d1138028 MV |
2008 | #if SCM_USE_PTHREAD_THREADS |
2009 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2010 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2011 | PTHREAD_MUTEX_RECURSIVE); | |
2012 | #endif | |
2013 | ||
2014 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2015 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2016 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2017 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2018 | |
9de87eea | 2019 | guilify_self_1 (base); |
9bc4701c MD |
2020 | } |
2021 | ||
d823b11b MV |
2022 | scm_t_bits scm_tc16_thread; |
2023 | scm_t_bits scm_tc16_mutex; | |
2024 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2025 | |
7bfd3b9e | 2026 | void |
9de87eea | 2027 | scm_init_threads () |
7bfd3b9e | 2028 | { |
9de87eea | 2029 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2030 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2031 | |
9de87eea | 2032 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2033 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2034 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2035 | |
9de87eea MV |
2036 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2037 | sizeof (fat_cond)); | |
9de87eea | 2038 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2039 | |
9de87eea MV |
2040 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2041 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2042 | threads_initialized_p = 1; |
a4d106c7 | 2043 | |
f39448c5 | 2044 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2045 | } |
89e00824 | 2046 | |
5f05c406 | 2047 | void |
9de87eea | 2048 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2049 | { |
9de87eea | 2050 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2051 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2052 | } |
2053 | ||
d823b11b | 2054 | void |
9de87eea | 2055 | scm_init_thread_procs () |
d823b11b | 2056 | { |
9de87eea | 2057 | #include "libguile/threads.x" |
d823b11b MV |
2058 | } |
2059 | ||
3c13664e LC |
2060 | \f |
2061 | /* IA64-specific things. */ | |
2062 | ||
2063 | #ifdef __ia64__ | |
2064 | # ifdef __hpux | |
2065 | # include <sys/param.h> | |
2066 | # include <sys/pstat.h> | |
2067 | void * | |
2068 | scm_ia64_register_backing_store_base (void) | |
2069 | { | |
2070 | struct pst_vm_status vm_status; | |
2071 | int i = 0; | |
2072 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2073 | if (vm_status.pst_type == PS_RSESTACK) | |
2074 | return (void *) vm_status.pst_vaddr; | |
2075 | abort (); | |
2076 | } | |
2077 | void * | |
2078 | scm_ia64_ar_bsp (const void *ctx) | |
2079 | { | |
2080 | uint64_t bsp; | |
2081 | __uc_get_ar_bsp (ctx, &bsp); | |
2082 | return (void *) bsp; | |
2083 | } | |
2084 | # endif /* hpux */ | |
2085 | # ifdef linux | |
2086 | # include <ucontext.h> | |
2087 | void * | |
2088 | scm_ia64_register_backing_store_base (void) | |
2089 | { | |
2090 | extern void *__libc_ia64_register_backing_store_base; | |
2091 | return __libc_ia64_register_backing_store_base; | |
2092 | } | |
2093 | void * | |
2094 | scm_ia64_ar_bsp (const void *opaque) | |
2095 | { | |
2096 | const ucontext_t *ctx = opaque; | |
2097 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2098 | } | |
2099 | # endif /* linux */ | |
2100 | #endif /* __ia64__ */ | |
2101 | ||
2102 | ||
89e00824 ML |
2103 | /* |
2104 | Local Variables: | |
2105 | c-file-style: "gnu" | |
2106 | End: | |
2107 | */ |