Commit | Line | Data |
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3c13664e | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 MV |
31 | #include <stdio.h> |
32 | #include <assert.h> | |
8ab3d8a0 KR |
33 | |
34 | #ifdef HAVE_STRING_H | |
35 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
36 | #endif | |
37 | ||
fcc5d734 | 38 | #if HAVE_SYS_TIME_H |
d823b11b | 39 | #include <sys/time.h> |
fcc5d734 | 40 | #endif |
5f05c406 | 41 | |
d823b11b MV |
42 | #include "libguile/validate.h" |
43 | #include "libguile/root.h" | |
44 | #include "libguile/eval.h" | |
45 | #include "libguile/async.h" | |
46 | #include "libguile/ports.h" | |
47 | #include "libguile/threads.h" | |
a0599745 | 48 | #include "libguile/dynwind.h" |
d823b11b | 49 | #include "libguile/iselect.h" |
9de87eea MV |
50 | #include "libguile/fluids.h" |
51 | #include "libguile/continuations.h" | |
2b829bbb | 52 | #include "libguile/gc.h" |
9de87eea | 53 | #include "libguile/init.h" |
2e77f720 | 54 | #include "libguile/scmsigs.h" |
6180e336 | 55 | #include "libguile/strings.h" |
a0faf7dd | 56 | #include "libguile/weaks.h" |
7bfd3b9e | 57 | |
ecc9f40f MV |
58 | #ifdef __MINGW32__ |
59 | #ifndef ETIMEDOUT | |
60 | # define ETIMEDOUT WSAETIMEDOUT | |
61 | #endif | |
62 | # include <fcntl.h> | |
63 | # include <process.h> | |
64 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
65 | #endif /* __MINGW32__ */ | |
66 | ||
634aa8de LC |
67 | #include <full-read.h> |
68 | ||
69 | \f | |
6180e336 NJ |
70 | static void |
71 | to_timespec (SCM t, scm_t_timespec *waittime) | |
72 | { | |
73 | if (scm_is_pair (t)) | |
74 | { | |
75 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
76 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
77 | } | |
78 | else | |
79 | { | |
80 | double time = scm_to_double (t); | |
81 | double sec = scm_c_truncate (time); | |
82 | ||
83 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 84 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
85 | } |
86 | } | |
87 | ||
c058db8a | 88 | \f |
d823b11b | 89 | /*** Queues */ |
7bfd3b9e | 90 | |
c058db8a LC |
91 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
92 | the risk of false references leading to unbounded retained space as | |
93 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
94 | H.J. Boehm, 2001. */ | |
95 | ||
9de87eea MV |
96 | /* Make an empty queue data structure. |
97 | */ | |
d823b11b MV |
98 | static SCM |
99 | make_queue () | |
100 | { | |
101 | return scm_cons (SCM_EOL, SCM_EOL); | |
102 | } | |
7bfd3b9e | 103 | |
9de87eea MV |
104 | /* Put T at the back of Q and return a handle that can be used with |
105 | remqueue to remove T from Q again. | |
106 | */ | |
d823b11b MV |
107 | static SCM |
108 | enqueue (SCM q, SCM t) | |
109 | { | |
110 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 111 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 112 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
113 | SCM_SETCDR (q, c); |
114 | else | |
115 | SCM_SETCDR (SCM_CAR (q), c); | |
116 | SCM_SETCAR (q, c); | |
d2a51087 | 117 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
118 | return c; |
119 | } | |
7bfd3b9e | 120 | |
9de87eea MV |
121 | /* Remove the element that the handle C refers to from the queue Q. C |
122 | must have been returned from a call to enqueue. The return value | |
123 | is zero when the element referred to by C has already been removed. | |
124 | Otherwise, 1 is returned. | |
125 | */ | |
126 | static int | |
d823b11b MV |
127 | remqueue (SCM q, SCM c) |
128 | { | |
129 | SCM p, prev = q; | |
d2a51087 | 130 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 131 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 132 | { |
bc36d050 | 133 | if (scm_is_eq (p, c)) |
d823b11b | 134 | { |
bc36d050 | 135 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
136 | SCM_SETCAR (q, SCM_CDR (c)); |
137 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
138 | |
139 | /* GC-robust */ | |
140 | SCM_SETCDR (c, SCM_EOL); | |
141 | ||
d2a51087 | 142 | SCM_CRITICAL_SECTION_END; |
9de87eea | 143 | return 1; |
d823b11b MV |
144 | } |
145 | prev = p; | |
146 | } | |
d2a51087 | 147 | SCM_CRITICAL_SECTION_END; |
9de87eea | 148 | return 0; |
d823b11b MV |
149 | } |
150 | ||
9de87eea MV |
151 | /* Remove the front-most element from the queue Q and return it. |
152 | Return SCM_BOOL_F when Q is empty. | |
153 | */ | |
d823b11b MV |
154 | static SCM |
155 | dequeue (SCM q) | |
156 | { | |
d2a51087 NJ |
157 | SCM c; |
158 | SCM_CRITICAL_SECTION_START; | |
159 | c = SCM_CDR (q); | |
d2e53ed6 | 160 | if (scm_is_null (c)) |
d2a51087 NJ |
161 | { |
162 | SCM_CRITICAL_SECTION_END; | |
163 | return SCM_BOOL_F; | |
164 | } | |
d823b11b MV |
165 | else |
166 | { | |
167 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 168 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 169 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 170 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
171 | |
172 | /* GC-robust */ | |
173 | SCM_SETCDR (c, SCM_EOL); | |
174 | ||
d823b11b MV |
175 | return SCM_CAR (c); |
176 | } | |
177 | } | |
7bfd3b9e | 178 | |
9de87eea | 179 | /*** Thread smob routines */ |
76da80e7 | 180 | |
d823b11b MV |
181 | |
182 | static int | |
183 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
184 | { | |
23d72566 KR |
185 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
186 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
187 | the struct case, hence we go via a union, and extract according to the | |
188 | size of pthread_t. */ | |
189 | union { | |
190 | scm_i_pthread_t p; | |
191 | unsigned short us; | |
192 | unsigned int ui; | |
193 | unsigned long ul; | |
194 | scm_t_uintmax um; | |
195 | } u; | |
9de87eea | 196 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
197 | scm_i_pthread_t p = t->pthread; |
198 | scm_t_uintmax id; | |
199 | u.p = p; | |
200 | if (sizeof (p) == sizeof (unsigned short)) | |
201 | id = u.us; | |
202 | else if (sizeof (p) == sizeof (unsigned int)) | |
203 | id = u.ui; | |
204 | else if (sizeof (p) == sizeof (unsigned long)) | |
205 | id = u.ul; | |
206 | else | |
207 | id = u.um; | |
208 | ||
d823b11b | 209 | scm_puts ("#<thread ", port); |
23d72566 | 210 | scm_uintprint (id, 10, port); |
1b92fb6b | 211 | scm_puts (" (", port); |
0345e278 | 212 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 213 | scm_puts (")>", port); |
d823b11b MV |
214 | return 1; |
215 | } | |
216 | ||
706846f6 | 217 | \f |
9de87eea | 218 | /*** Blocking on queues. */ |
f7eca35d | 219 | |
9de87eea MV |
220 | /* See also scm_i_queue_async_cell for how such a block is |
221 | interrputed. | |
222 | */ | |
d823b11b | 223 | |
9de87eea MV |
224 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
225 | be woken up by a call to 'unblock_from_queue', or to be | |
226 | interrupted. Upon return of this function, the current thread is | |
227 | no longer on QUEUE, even when the sleep has been interrupted. | |
228 | ||
d2a51087 | 229 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
230 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
231 | ||
232 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
233 | as MUTEX is needed. | |
234 | ||
235 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
236 | ||
237 | The return value of block_self is an errno value. It will be zero | |
238 | when the sleep has been successfully completed by a call to | |
239 | unblock_from_queue, EINTR when it has been interrupted by the | |
240 | delivery of a system async, and ETIMEDOUT when the timeout has | |
241 | expired. | |
242 | ||
243 | The system asyncs themselves are not executed by block_self. | |
244 | */ | |
245 | static int | |
246 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
247 | const scm_t_timespec *waittime) | |
76da80e7 | 248 | { |
9de87eea MV |
249 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
250 | SCM q_handle; | |
251 | int err; | |
252 | ||
253 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
254 | err = EINTR; | |
255 | else | |
256 | { | |
257 | t->block_asyncs++; | |
258 | q_handle = enqueue (queue, t->handle); | |
259 | if (waittime == NULL) | |
260 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
261 | else | |
262 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
263 | ||
264 | /* When we are still on QUEUE, we have been interrupted. We | |
265 | report this only when no other error (such as a timeout) has | |
266 | happened above. | |
267 | */ | |
268 | if (remqueue (queue, q_handle) && err == 0) | |
269 | err = EINTR; | |
270 | t->block_asyncs--; | |
271 | scm_i_reset_sleep (t); | |
272 | } | |
273 | ||
274 | return err; | |
76da80e7 | 275 | } |
9de87eea | 276 | |
d2a51087 NJ |
277 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
278 | returned, or #f if the queue was empty. | |
9de87eea MV |
279 | */ |
280 | static SCM | |
281 | unblock_from_queue (SCM queue) | |
282 | { | |
283 | SCM thread = dequeue (queue); | |
284 | if (scm_is_true (thread)) | |
285 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
286 | return thread; | |
287 | } | |
288 | ||
45f15cac | 289 | \f |
9de87eea MV |
290 | /* Getting into and out of guile mode. |
291 | */ | |
292 | ||
705edb95 LC |
293 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
294 | ||
295 | /* When thread-local storage (TLS) is available, a pointer to the | |
296 | current-thread object is kept in TLS. Note that storing the thread-object | |
297 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
298 | possible since thread objects may live longer than the actual thread they | |
299 | represent. */ | |
300 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
301 | ||
302 | # define SET_CURRENT_THREAD(_t) scm_i_current_thread = (_t) | |
303 | ||
304 | #else /* !SCM_HAVE_THREAD_STORAGE_CLASS */ | |
305 | ||
306 | /* Key used to retrieve the current thread with `pthread_getspecific ()'. */ | |
9de87eea MV |
307 | scm_i_pthread_key_t scm_i_thread_key; |
308 | ||
705edb95 LC |
309 | # define SET_CURRENT_THREAD(_t) \ |
310 | scm_i_pthread_setspecific (scm_i_thread_key, (_t)) | |
311 | ||
312 | #endif /* !SCM_HAVE_THREAD_STORAGE_CLASS */ | |
313 | ||
d823b11b | 314 | |
9de87eea MV |
315 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
316 | static scm_i_thread *all_threads = NULL; | |
317 | static int thread_count; | |
318 | ||
319 | static SCM scm_i_default_dynamic_state; | |
320 | ||
321 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 322 | */ |
9de87eea MV |
323 | static void |
324 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 325 | { |
c812243b | 326 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
327 | |
328 | t->pthread = scm_i_pthread_self (); | |
329 | t->handle = SCM_BOOL_F; | |
330 | t->result = SCM_BOOL_F; | |
2e77f720 | 331 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 332 | t->mutexes = SCM_EOL; |
d2a51087 | 333 | t->held_mutex = NULL; |
9de87eea MV |
334 | t->join_queue = SCM_EOL; |
335 | t->dynamic_state = SCM_BOOL_F; | |
336 | t->dynwinds = SCM_EOL; | |
337 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
338 | t->block_asyncs = 1; |
339 | t->pending_asyncs = 1; | |
87f30eda | 340 | t->critical_section_level = 0; |
9de87eea MV |
341 | t->last_debug_frame = NULL; |
342 | t->base = base; | |
346e4402 NJ |
343 | #ifdef __ia64__ |
344 | /* Calculate and store off the base of this thread's register | |
345 | backing store (RBS). Unfortunately our implementation(s) of | |
346 | scm_ia64_register_backing_store_base are only reliable for the | |
347 | main thread. For other threads, therefore, find out the current | |
348 | top of the RBS, and use that as a maximum. */ | |
349 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
350 | { | |
351 | ucontext_t ctx; | |
352 | void *bsp; | |
353 | getcontext (&ctx); | |
354 | bsp = scm_ia64_ar_bsp (&ctx); | |
355 | if (t->register_backing_store_base > bsp) | |
356 | t->register_backing_store_base = bsp; | |
357 | } | |
358 | #endif | |
0c97d7dd | 359 | t->continuation_root = SCM_EOL; |
9de87eea MV |
360 | t->continuation_base = base; |
361 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
362 | t->sleep_mutex = NULL; | |
363 | t->sleep_object = SCM_BOOL_F; | |
364 | t->sleep_fd = -1; | |
634aa8de LC |
365 | |
366 | if (pipe (t->sleep_pipe) != 0) | |
367 | /* FIXME: Error conditions during the initialization phase are handled | |
368 | gracelessly since public functions such as `scm_init_guile ()' | |
369 | currently have type `void'. */ | |
370 | abort (); | |
371 | ||
86a597f8 | 372 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
378f2625 LC |
373 | t->current_mark_stack_ptr = NULL; |
374 | t->current_mark_stack_limit = NULL; | |
2e77f720 | 375 | t->canceled = 0; |
9de87eea | 376 | t->exited = 0; |
72e6b608 | 377 | t->guile_mode = 0; |
9de87eea | 378 | |
705edb95 | 379 | SET_CURRENT_THREAD (t); |
9de87eea | 380 | |
9de87eea MV |
381 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
382 | t->next_thread = all_threads; | |
383 | all_threads = t; | |
384 | thread_count++; | |
385 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
386 | } |
387 | ||
9de87eea | 388 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 389 | */ |
9de87eea MV |
390 | static void |
391 | guilify_self_2 (SCM parent) | |
d823b11b | 392 | { |
9de87eea MV |
393 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
394 | ||
72e6b608 LC |
395 | t->guile_mode = 1; |
396 | ||
9de87eea | 397 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 398 | |
9de87eea MV |
399 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
400 | t->continuation_base = t->base; | |
2bbe1533 | 401 | t->vm = SCM_BOOL_F; |
9de87eea MV |
402 | |
403 | if (scm_is_true (parent)) | |
404 | t->dynamic_state = scm_make_dynamic_state (parent); | |
405 | else | |
406 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
407 | ||
408 | t->join_queue = make_queue (); | |
409 | t->block_asyncs = 0; | |
d823b11b MV |
410 | } |
411 | ||
6180e336 NJ |
412 | \f |
413 | /*** Fat mutexes */ | |
414 | ||
415 | /* We implement our own mutex type since we want them to be 'fair', we | |
416 | want to do fancy things while waiting for them (like running | |
417 | asyncs) and we might want to add things that are nice for | |
418 | debugging. | |
419 | */ | |
420 | ||
421 | typedef struct { | |
422 | scm_i_pthread_mutex_t lock; | |
423 | SCM owner; | |
adc085f1 | 424 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 425 | |
adc085f1 | 426 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
427 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
428 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
429 | owned by the current thread? */ | |
430 | ||
431 | SCM waiting; /* the threads waiting for this mutex. */ | |
432 | } fat_mutex; | |
433 | ||
434 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
435 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
436 | ||
9de87eea | 437 | /* Perform thread tear-down, in guile mode. |
d823b11b | 438 | */ |
9de87eea MV |
439 | static void * |
440 | do_thread_exit (void *v) | |
441 | { | |
2e77f720 LC |
442 | scm_i_thread *t = (scm_i_thread *) v; |
443 | ||
444 | if (!scm_is_false (t->cleanup_handler)) | |
445 | { | |
446 | SCM ptr = t->cleanup_handler; | |
447 | ||
448 | t->cleanup_handler = SCM_BOOL_F; | |
449 | t->result = scm_internal_catch (SCM_BOOL_T, | |
450 | (scm_t_catch_body) scm_call_0, ptr, | |
451 | scm_handle_by_message_noexit, NULL); | |
452 | } | |
9de87eea | 453 | |
86a597f8 | 454 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
455 | |
456 | t->exited = 1; | |
0c97d7dd MV |
457 | close (t->sleep_pipe[0]); |
458 | close (t->sleep_pipe[1]); | |
9de87eea MV |
459 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
460 | ; | |
9de87eea | 461 | |
74926120 | 462 | while (!scm_is_null (t->mutexes)) |
6180e336 | 463 | { |
a0faf7dd | 464 | SCM mutex = SCM_WEAK_PAIR_CAR (t->mutexes); |
74926120 | 465 | |
a0faf7dd LC |
466 | if (!SCM_UNBNDP (mutex)) |
467 | { | |
468 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
469 | ||
470 | scm_i_pthread_mutex_lock (&m->lock); | |
471 | unblock_from_queue (m->waiting); | |
472 | scm_i_pthread_mutex_unlock (&m->lock); | |
473 | } | |
6180e336 | 474 | |
a0faf7dd | 475 | t->mutexes = SCM_WEAK_PAIR_CDR (t->mutexes); |
6180e336 NJ |
476 | } |
477 | ||
86a597f8 | 478 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 479 | |
9de87eea MV |
480 | return NULL; |
481 | } | |
482 | ||
d823b11b | 483 | static void |
9de87eea | 484 | on_thread_exit (void *v) |
d823b11b | 485 | { |
29776e85 | 486 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 487 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 488 | |
d2a51087 NJ |
489 | /* If this thread was cancelled while doing a cond wait, it will |
490 | still have a mutex locked, so we unlock it here. */ | |
491 | if (t->held_mutex) | |
492 | { | |
493 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
494 | t->held_mutex = NULL; | |
495 | } | |
496 | ||
705edb95 | 497 | SET_CURRENT_THREAD (v); |
0c97d7dd | 498 | |
2e77f720 LC |
499 | /* Ensure the signal handling thread has been launched, because we might be |
500 | shutting it down. */ | |
501 | scm_i_ensure_signal_delivery_thread (); | |
502 | ||
0c97d7dd | 503 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 504 | since the queue is a SCM data structure. */ |
35747a3e | 505 | |
47b6e9bd LC |
506 | /* Note: Since `do_thread_exit ()' uses allocates memory via `libgc', we |
507 | assume the GC is usable at this point, and notably that thread-local | |
508 | storage (TLS) hasn't been deallocated yet. */ | |
509 | do_thread_exit (v); | |
0c97d7dd MV |
510 | |
511 | /* Removing ourself from the list of all threads needs to happen in | |
512 | non-guile mode since all SCM values on our stack become | |
29776e85 | 513 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
514 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
515 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
516 | if (*tp == t) | |
517 | { | |
518 | *tp = t->next_thread; | |
c058db8a LC |
519 | |
520 | /* GC-robust */ | |
521 | t->next_thread = NULL; | |
522 | ||
0c97d7dd MV |
523 | break; |
524 | } | |
525 | thread_count--; | |
2e77f720 LC |
526 | |
527 | /* If there's only one other thread, it could be the signal delivery | |
528 | thread, so we need to notify it to shut down by closing its read pipe. | |
529 | If it's not the signal delivery thread, then closing the read pipe isn't | |
530 | going to hurt. */ | |
531 | if (thread_count <= 1) | |
532 | scm_i_close_signal_pipe (); | |
533 | ||
0c97d7dd MV |
534 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
535 | ||
705edb95 | 536 | SET_CURRENT_THREAD (NULL); |
d823b11b MV |
537 | } |
538 | ||
705edb95 LC |
539 | #ifndef SCM_HAVE_THREAD_STORAGE_CLASS |
540 | ||
9de87eea | 541 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 542 | |
9de87eea MV |
543 | static void |
544 | init_thread_key (void) | |
545 | { | |
47b6e9bd | 546 | scm_i_pthread_key_create (&scm_i_thread_key, NULL); |
9de87eea | 547 | } |
d823b11b | 548 | |
705edb95 LC |
549 | #endif |
550 | ||
9de87eea MV |
551 | /* Perform any initializations necessary to bring the current thread |
552 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 553 | |
9de87eea MV |
554 | BASE is the stack base to use with GC. |
555 | ||
556 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
557 | which case the default dynamic state is used. | |
558 | ||
559 | Return zero when the thread was in guile mode already; otherwise | |
560 | return 1. | |
561 | */ | |
562 | ||
563 | static int | |
564 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 565 | { |
9de87eea MV |
566 | scm_i_thread *t; |
567 | ||
705edb95 | 568 | #ifndef SCM_HAVE_THREAD_STORAGE_CLASS |
9de87eea | 569 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
705edb95 | 570 | #endif |
9de87eea | 571 | |
705edb95 LC |
572 | t = SCM_I_CURRENT_THREAD; |
573 | if (t == NULL) | |
9de87eea MV |
574 | { |
575 | /* This thread has not been guilified yet. | |
576 | */ | |
577 | ||
578 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
579 | if (scm_initialized_p == 0) | |
580 | { | |
581 | /* First thread ever to enter Guile. Run the full | |
582 | initialization. | |
583 | */ | |
584 | scm_i_init_guile (base); | |
585 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
586 | } | |
587 | else | |
588 | { | |
589 | /* Guile is already initialized, but this thread enters it for | |
590 | the first time. Only initialize this thread. | |
591 | */ | |
592 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
593 | guilify_self_1 (base); | |
594 | guilify_self_2 (parent); | |
595 | } | |
596 | return 1; | |
597 | } | |
598 | else if (t->top) | |
599 | { | |
600 | /* This thread is already guilified but not in guile mode, just | |
601 | resume it. | |
74926120 | 602 | |
ccf1ca4a LC |
603 | A user call to scm_with_guile() will lead us to here. This could |
604 | happen from anywhere on the stack, and in particular lower on the | |
605 | stack than when it was when this thread was first guilified. Thus, | |
606 | `base' must be updated. */ | |
607 | #if SCM_STACK_GROWS_UP | |
608 | if (base < t->base) | |
609 | t->base = base; | |
610 | #else | |
611 | if (base > t->base) | |
612 | t->base = base; | |
613 | #endif | |
614 | ||
45f15cac | 615 | t->top = NULL; |
9de87eea MV |
616 | return 1; |
617 | } | |
618 | else | |
619 | { | |
620 | /* Thread is already in guile mode. Nothing to do. | |
621 | */ | |
622 | return 0; | |
623 | } | |
d823b11b MV |
624 | } |
625 | ||
9de87eea | 626 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 627 | |
23d72566 KR |
628 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
629 | /* This method for GNU/Linux and perhaps some other systems. | |
630 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
631 | available on them. */ | |
9de87eea MV |
632 | #define HAVE_GET_THREAD_STACK_BASE |
633 | ||
634 | static SCM_STACKITEM * | |
635 | get_thread_stack_base () | |
d823b11b | 636 | { |
9de87eea MV |
637 | pthread_attr_t attr; |
638 | void *start, *end; | |
639 | size_t size; | |
640 | ||
9de87eea MV |
641 | pthread_getattr_np (pthread_self (), &attr); |
642 | pthread_attr_getstack (&attr, &start, &size); | |
643 | end = (char *)start + size; | |
644 | ||
2b829bbb KR |
645 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
646 | for the main thread, but we can use scm_get_stack_base in that | |
647 | case. | |
648 | */ | |
649 | ||
650 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 651 | if ((void *)&attr < start || (void *)&attr >= end) |
071e0d93 | 652 | return (SCM_STACKITEM *) GC_stackbottom; |
9de87eea | 653 | else |
2b829bbb | 654 | #endif |
9de87eea MV |
655 | { |
656 | #if SCM_STACK_GROWS_UP | |
657 | return start; | |
658 | #else | |
659 | return end; | |
660 | #endif | |
661 | } | |
a54a94b3 MV |
662 | } |
663 | ||
23d72566 KR |
664 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
665 | /* This method for MacOS X. | |
666 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
667 | but as of 2006 there's nothing obvious at apple.com. */ | |
668 | #define HAVE_GET_THREAD_STACK_BASE | |
669 | static SCM_STACKITEM * | |
670 | get_thread_stack_base () | |
671 | { | |
672 | return pthread_get_stackaddr_np (pthread_self ()); | |
673 | } | |
674 | ||
675 | #elif defined (__MINGW32__) | |
676 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
677 | in any thread. We don't like hard-coding the name of a system, but there | |
678 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
679 | work. */ | |
680 | #define HAVE_GET_THREAD_STACK_BASE | |
681 | static SCM_STACKITEM * | |
682 | get_thread_stack_base () | |
683 | { | |
071e0d93 | 684 | return (SCM_STACKITEM *) GC_stackbottom; |
23d72566 KR |
685 | } |
686 | ||
687 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
688 | |
689 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
690 | ||
691 | #define HAVE_GET_THREAD_STACK_BASE | |
692 | ||
693 | static SCM_STACKITEM * | |
694 | get_thread_stack_base () | |
a54a94b3 | 695 | { |
071e0d93 | 696 | return (SCM_STACKITEM *) GC_stackbottom; |
d823b11b MV |
697 | } |
698 | ||
9de87eea | 699 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
700 | |
701 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
702 | ||
703 | void | |
704 | scm_init_guile () | |
d823b11b | 705 | { |
9de87eea MV |
706 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
707 | scm_i_default_dynamic_state); | |
d823b11b MV |
708 | } |
709 | ||
9de87eea MV |
710 | #endif |
711 | ||
712 | void * | |
713 | scm_with_guile (void *(*func)(void *), void *data) | |
714 | { | |
715 | return scm_i_with_guile_and_parent (func, data, | |
716 | scm_i_default_dynamic_state); | |
717 | } | |
718 | ||
70eca635 | 719 | SCM_UNUSED static void |
2e77f720 LC |
720 | scm_leave_guile_cleanup (void *x) |
721 | { | |
47b6e9bd | 722 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
723 | } |
724 | ||
9de87eea | 725 | void * |
2e77f720 | 726 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
727 | { |
728 | void *res; | |
729 | int really_entered; | |
730 | SCM_STACKITEM base_item; | |
2e77f720 | 731 | |
9de87eea | 732 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 733 | if (really_entered) |
2e77f720 LC |
734 | { |
735 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
736 | res = scm_c_with_continuation_barrier (func, data); | |
737 | scm_i_pthread_cleanup_pop (0); | |
2e77f720 | 738 | } |
74926120 | 739 | else |
2e77f720 LC |
740 | res = scm_c_with_continuation_barrier (func, data); |
741 | ||
9de87eea MV |
742 | return res; |
743 | } | |
744 | ||
72e6b608 LC |
745 | \f |
746 | /*** Non-guile mode. */ | |
747 | ||
748 | #if (defined HAVE_GC_DO_BLOCKING) && (!defined HAVE_DECL_GC_DO_BLOCKING) | |
749 | ||
750 | /* This declaration is missing from the public headers of GC 7.1. */ | |
751 | extern void GC_do_blocking (void (*) (void *), void *); | |
752 | ||
753 | #endif | |
754 | ||
755 | #ifdef HAVE_GC_DO_BLOCKING | |
756 | struct without_guile_arg | |
757 | { | |
758 | void * (*function) (void *); | |
759 | void *data; | |
760 | void *result; | |
761 | }; | |
762 | ||
763 | static void | |
764 | without_guile_trampoline (void *closure) | |
765 | { | |
766 | struct without_guile_arg *arg; | |
767 | ||
768 | SCM_I_CURRENT_THREAD->guile_mode = 0; | |
769 | ||
770 | arg = (struct without_guile_arg *) closure; | |
771 | arg->result = arg->function (arg->data); | |
772 | ||
773 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
774 | } | |
775 | #endif | |
776 | ||
9de87eea MV |
777 | void * |
778 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 779 | { |
72e6b608 LC |
780 | void *result; |
781 | ||
782 | #ifdef HAVE_GC_DO_BLOCKING | |
783 | if (SCM_I_CURRENT_THREAD->guile_mode) | |
784 | { | |
785 | struct without_guile_arg arg; | |
786 | ||
787 | arg.function = func; | |
788 | arg.data = data; | |
789 | GC_do_blocking (without_guile_trampoline, &arg); | |
790 | result = arg.result; | |
791 | } | |
792 | else | |
793 | #endif | |
794 | result = func (data); | |
795 | ||
796 | return result; | |
9de87eea MV |
797 | } |
798 | ||
72e6b608 | 799 | \f |
9de87eea MV |
800 | /*** Thread creation */ |
801 | ||
802 | typedef struct { | |
803 | SCM parent; | |
804 | SCM thunk; | |
805 | SCM handler; | |
76da80e7 | 806 | SCM thread; |
9de87eea MV |
807 | scm_i_pthread_mutex_t mutex; |
808 | scm_i_pthread_cond_t cond; | |
809 | } launch_data; | |
d823b11b | 810 | |
9de87eea MV |
811 | static void * |
812 | really_launch (void *d) | |
813 | { | |
814 | launch_data *data = (launch_data *)d; | |
815 | SCM thunk = data->thunk, handler = data->handler; | |
816 | scm_i_thread *t; | |
d823b11b | 817 | |
9de87eea | 818 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 819 | |
9de87eea MV |
820 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
821 | data->thread = scm_current_thread (); | |
822 | scm_i_pthread_cond_signal (&data->cond); | |
823 | scm_i_pthread_mutex_unlock (&data->mutex); | |
824 | ||
825 | if (SCM_UNBNDP (handler)) | |
826 | t->result = scm_call_0 (thunk); | |
827 | else | |
828 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
829 | ||
47b6e9bd LC |
830 | /* Trigger a call to `on_thread_exit ()'. */ |
831 | pthread_exit (NULL); | |
832 | ||
9de87eea | 833 | return 0; |
d823b11b MV |
834 | } |
835 | ||
9de87eea MV |
836 | static void * |
837 | launch_thread (void *d) | |
838 | { | |
839 | launch_data *data = (launch_data *)d; | |
840 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
841 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
842 | return NULL; | |
843 | } | |
844 | ||
845 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 846 | (SCM thunk, SCM handler), |
9de87eea MV |
847 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
848 | "returning a new thread object representing the thread. The procedure\n" | |
849 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
850 | "\n" | |
851 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
852 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
853 | "handler. This catch is established inside the continuation barrier.\n" | |
854 | "\n" | |
855 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
856 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
857 | #define FUNC_NAME s_scm_call_with_new_thread |
858 | { | |
9de87eea MV |
859 | launch_data data; |
860 | scm_i_pthread_t id; | |
861 | int err; | |
d823b11b | 862 | |
9de87eea MV |
863 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
864 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
865 | handler, SCM_ARG2, FUNC_NAME); | |
866 | ||
867 | data.parent = scm_current_dynamic_state (); | |
868 | data.thunk = thunk; | |
869 | data.handler = handler; | |
870 | data.thread = SCM_BOOL_F; | |
871 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
872 | scm_i_pthread_cond_init (&data.cond, NULL); | |
873 | ||
874 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
875 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
876 | if (err) | |
877 | { | |
878 | scm_i_pthread_mutex_unlock (&data.mutex); | |
879 | errno = err; | |
880 | scm_syserror (NULL); | |
881 | } | |
882 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
883 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 884 | |
9de87eea | 885 | return data.thread; |
d823b11b MV |
886 | } |
887 | #undef FUNC_NAME | |
888 | ||
9de87eea MV |
889 | typedef struct { |
890 | SCM parent; | |
891 | scm_t_catch_body body; | |
892 | void *body_data; | |
893 | scm_t_catch_handler handler; | |
894 | void *handler_data; | |
895 | SCM thread; | |
896 | scm_i_pthread_mutex_t mutex; | |
897 | scm_i_pthread_cond_t cond; | |
898 | } spawn_data; | |
899 | ||
900 | static void * | |
901 | really_spawn (void *d) | |
902 | { | |
903 | spawn_data *data = (spawn_data *)d; | |
904 | scm_t_catch_body body = data->body; | |
905 | void *body_data = data->body_data; | |
906 | scm_t_catch_handler handler = data->handler; | |
907 | void *handler_data = data->handler_data; | |
908 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
909 | ||
910 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
911 | data->thread = scm_current_thread (); | |
912 | scm_i_pthread_cond_signal (&data->cond); | |
913 | scm_i_pthread_mutex_unlock (&data->mutex); | |
914 | ||
915 | if (handler == NULL) | |
916 | t->result = body (body_data); | |
917 | else | |
918 | t->result = scm_internal_catch (SCM_BOOL_T, | |
919 | body, body_data, | |
920 | handler, handler_data); | |
921 | ||
922 | return 0; | |
923 | } | |
924 | ||
925 | static void * | |
926 | spawn_thread (void *d) | |
927 | { | |
928 | spawn_data *data = (spawn_data *)d; | |
929 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
930 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
931 | return NULL; | |
932 | } | |
933 | ||
934 | SCM | |
935 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
936 | scm_t_catch_handler handler, void *handler_data) | |
937 | { | |
938 | spawn_data data; | |
939 | scm_i_pthread_t id; | |
940 | int err; | |
941 | ||
942 | data.parent = scm_current_dynamic_state (); | |
943 | data.body = body; | |
944 | data.body_data = body_data; | |
945 | data.handler = handler; | |
946 | data.handler_data = handler_data; | |
947 | data.thread = SCM_BOOL_F; | |
948 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
949 | scm_i_pthread_cond_init (&data.cond, NULL); | |
950 | ||
951 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
952 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
953 | if (err) | |
954 | { | |
955 | scm_i_pthread_mutex_unlock (&data.mutex); | |
956 | errno = err; | |
957 | scm_syserror (NULL); | |
958 | } | |
959 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
960 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 961 | |
9de87eea MV |
962 | return data.thread; |
963 | } | |
964 | ||
29717c89 MD |
965 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
966 | (), | |
967 | "Move the calling thread to the end of the scheduling queue.") | |
968 | #define FUNC_NAME s_scm_yield | |
969 | { | |
9de87eea | 970 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
971 | } |
972 | #undef FUNC_NAME | |
973 | ||
2e77f720 LC |
974 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
975 | (SCM thread), | |
976 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
977 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
978 | "been signaled to terminate, this function is a no-op.") | |
979 | #define FUNC_NAME s_scm_cancel_thread | |
980 | { | |
981 | scm_i_thread *t = NULL; | |
982 | ||
983 | SCM_VALIDATE_THREAD (1, thread); | |
984 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 985 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
986 | if (!t->canceled) |
987 | { | |
988 | t->canceled = 1; | |
86a597f8 | 989 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
990 | scm_i_pthread_cancel (t->pthread); |
991 | } | |
992 | else | |
86a597f8 | 993 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
994 | |
995 | return SCM_UNSPECIFIED; | |
996 | } | |
997 | #undef FUNC_NAME | |
998 | ||
999 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1000 | (SCM thread, SCM proc), | |
1001 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1002 | "This handler will be called when the thread exits.") | |
1003 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1004 | { | |
1005 | scm_i_thread *t; | |
1006 | ||
1007 | SCM_VALIDATE_THREAD (1, thread); | |
1008 | if (!scm_is_false (proc)) | |
1009 | SCM_VALIDATE_THUNK (2, proc); | |
1010 | ||
2e77f720 | 1011 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1012 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1013 | ||
2e77f720 LC |
1014 | if (!(t->exited || t->canceled)) |
1015 | t->cleanup_handler = proc; | |
1016 | ||
86a597f8 | 1017 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1018 | |
1019 | return SCM_UNSPECIFIED; | |
1020 | } | |
1021 | #undef FUNC_NAME | |
1022 | ||
1023 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1024 | (SCM thread), | |
1025 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1026 | #define FUNC_NAME s_scm_thread_cleanup | |
1027 | { | |
1028 | scm_i_thread *t; | |
1029 | SCM ret; | |
1030 | ||
1031 | SCM_VALIDATE_THREAD (1, thread); | |
1032 | ||
2e77f720 | 1033 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1034 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1035 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1036 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1037 | |
1038 | return ret; | |
1039 | } | |
1040 | #undef FUNC_NAME | |
1041 | ||
6180e336 NJ |
1042 | SCM scm_join_thread (SCM thread) |
1043 | { | |
1044 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1045 | } | |
1046 | ||
1047 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1048 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1049 | "Suspend execution of the calling thread until the target @var{thread} " |
1050 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1051 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1052 | { |
9de87eea | 1053 | scm_i_thread *t; |
6180e336 NJ |
1054 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1055 | SCM res = SCM_BOOL_F; | |
1056 | ||
1057 | if (! (SCM_UNBNDP (timeoutval))) | |
1058 | res = timeoutval; | |
d823b11b MV |
1059 | |
1060 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1061 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1062 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1063 | |
9de87eea | 1064 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1065 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1066 | ||
6180e336 NJ |
1067 | if (! SCM_UNBNDP (timeout)) |
1068 | { | |
1069 | to_timespec (timeout, &ctimeout); | |
1070 | timeout_ptr = &ctimeout; | |
1071 | } | |
1072 | ||
1073 | if (t->exited) | |
1074 | res = t->result; | |
1075 | else | |
d823b11b | 1076 | { |
9de87eea MV |
1077 | while (1) |
1078 | { | |
74926120 | 1079 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1080 | timeout_ptr); |
1081 | if (err == 0) | |
1082 | { | |
1083 | if (t->exited) | |
1084 | { | |
1085 | res = t->result; | |
1086 | break; | |
1087 | } | |
1088 | } | |
1089 | else if (err == ETIMEDOUT) | |
9de87eea | 1090 | break; |
6180e336 | 1091 | |
86a597f8 | 1092 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1093 | SCM_TICK; |
86a597f8 | 1094 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1095 | |
1096 | /* Check for exit again, since we just released and | |
1097 | reacquired the admin mutex, before the next block_self | |
1098 | call (which would block forever if t has already | |
1099 | exited). */ | |
1100 | if (t->exited) | |
1101 | { | |
1102 | res = t->result; | |
1103 | break; | |
1104 | } | |
9de87eea | 1105 | } |
d823b11b | 1106 | } |
9de87eea | 1107 | |
86a597f8 | 1108 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1109 | |
d823b11b | 1110 | return res; |
5f05c406 MV |
1111 | } |
1112 | #undef FUNC_NAME | |
1113 | ||
6180e336 NJ |
1114 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1115 | (SCM obj), | |
1116 | "Return @code{#t} if @var{obj} is a thread.") | |
1117 | #define FUNC_NAME s_scm_thread_p | |
1118 | { | |
1119 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1120 | } | |
1121 | #undef FUNC_NAME | |
5f05c406 | 1122 | |
4079f87e | 1123 | |
9de87eea MV |
1124 | static size_t |
1125 | fat_mutex_free (SCM mx) | |
76da80e7 | 1126 | { |
9de87eea MV |
1127 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1128 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1129 | return 0; |
1130 | } | |
1131 | ||
1132 | static int | |
9de87eea | 1133 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1134 | { |
9de87eea MV |
1135 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1136 | scm_puts ("#<mutex ", port); | |
1137 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1138 | scm_puts (">", port); | |
1139 | return 1; | |
76da80e7 MV |
1140 | } |
1141 | ||
76da80e7 | 1142 | static SCM |
6180e336 | 1143 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1144 | { |
9de87eea MV |
1145 | fat_mutex *m; |
1146 | SCM mx; | |
1147 | ||
1148 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1149 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1150 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1151 | m->level = 0; |
6180e336 | 1152 | |
adc085f1 | 1153 | m->recursive = recursive; |
6180e336 NJ |
1154 | m->unchecked_unlock = unchecked_unlock; |
1155 | m->allow_external_unlock = external_unlock; | |
1156 | ||
9de87eea MV |
1157 | m->waiting = SCM_EOL; |
1158 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1159 | m->waiting = make_queue (); | |
1160 | return mx; | |
76da80e7 MV |
1161 | } |
1162 | ||
6180e336 NJ |
1163 | SCM scm_make_mutex (void) |
1164 | { | |
1165 | return scm_make_mutex_with_flags (SCM_EOL); | |
1166 | } | |
1167 | ||
2a1d0688 NJ |
1168 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1169 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1170 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1171 | |
1172 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1173 | (SCM flags), | |
9de87eea | 1174 | "Create a new mutex. ") |
6180e336 | 1175 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1176 | { |
6180e336 NJ |
1177 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1178 | ||
1179 | SCM ptr = flags; | |
1180 | while (! scm_is_null (ptr)) | |
1181 | { | |
1182 | SCM flag = SCM_CAR (ptr); | |
1183 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1184 | unchecked_unlock = 1; | |
1185 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1186 | external_unlock = 1; | |
1187 | else if (scm_is_eq (flag, recursive_sym)) | |
1188 | recursive = 1; | |
74926120 | 1189 | else |
2a1d0688 | 1190 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1191 | ptr = SCM_CDR (ptr); |
1192 | } | |
1193 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1194 | } |
1195 | #undef FUNC_NAME | |
1196 | ||
9de87eea | 1197 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1198 | (void), |
9de87eea MV |
1199 | "Create a new recursive mutex. ") |
1200 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1201 | { |
6180e336 | 1202 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1203 | } |
1204 | #undef FUNC_NAME | |
1205 | ||
6180e336 NJ |
1206 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1207 | ||
1208 | static SCM | |
adc085f1 | 1209 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1210 | { |
1211 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1212 | |
adc085f1 | 1213 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1214 | SCM err = SCM_BOOL_F; |
1215 | ||
1216 | struct timeval current_time; | |
9de87eea MV |
1217 | |
1218 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1219 | |
1220 | while (1) | |
9de87eea | 1221 | { |
adc085f1 | 1222 | if (m->level == 0) |
6180e336 | 1223 | { |
adc085f1 | 1224 | m->owner = new_owner; |
6180e336 | 1225 | m->level++; |
74926120 | 1226 | |
adc085f1 | 1227 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1228 | { |
adc085f1 | 1229 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 | 1230 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1231 | |
1232 | /* Only keep a weak reference to MUTEX so that it's not | |
1233 | retained when not referenced elsewhere (bug #27450). Note | |
1234 | that the weak pair itself it still retained, but it's better | |
1235 | than retaining MUTEX and the threads referred to by its | |
1236 | associated queue. */ | |
1237 | t->mutexes = scm_weak_car_pair (mutex, t->mutexes); | |
1238 | ||
6180e336 | 1239 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1240 | } |
adc085f1 JG |
1241 | *ret = 1; |
1242 | break; | |
1243 | } | |
1244 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1245 | { | |
1246 | m->owner = new_owner; | |
1247 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1248 | scm_from_locale_string ("lock obtained on abandoned " | |
1249 | "mutex")); | |
1250 | *ret = 1; | |
1251 | break; | |
1252 | } | |
1253 | else if (scm_is_eq (m->owner, new_owner)) | |
1254 | { | |
1255 | if (m->recursive) | |
1256 | { | |
1257 | m->level++; | |
74926120 | 1258 | *ret = 1; |
adc085f1 JG |
1259 | } |
1260 | else | |
6180e336 | 1261 | { |
adc085f1 JG |
1262 | err = scm_cons (scm_misc_error_key, |
1263 | scm_from_locale_string ("mutex already locked " | |
1264 | "by thread")); | |
1265 | *ret = 0; | |
1266 | } | |
74926120 | 1267 | break; |
adc085f1 | 1268 | } |
9de87eea | 1269 | else |
9de87eea | 1270 | { |
74926120 | 1271 | if (timeout != NULL) |
adc085f1 JG |
1272 | { |
1273 | gettimeofday (¤t_time, NULL); | |
1274 | if (current_time.tv_sec > timeout->tv_sec || | |
1275 | (current_time.tv_sec == timeout->tv_sec && | |
1276 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1277 | { |
adc085f1 JG |
1278 | *ret = 0; |
1279 | break; | |
6180e336 | 1280 | } |
6180e336 | 1281 | } |
37a52039 | 1282 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1283 | scm_i_pthread_mutex_unlock (&m->lock); |
1284 | SCM_TICK; | |
1285 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1286 | } | |
1287 | } | |
1288 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1289 | return err; |
9de87eea MV |
1290 | } |
1291 | ||
6180e336 NJ |
1292 | SCM scm_lock_mutex (SCM mx) |
1293 | { | |
adc085f1 | 1294 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1295 | } |
1296 | ||
adc085f1 JG |
1297 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1298 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1299 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1300 | "blocks until the mutex becomes available. The function returns when " | |
1301 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1302 | "a thread already owns will succeed right away and will not block the " | |
1303 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1304 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1305 | { |
6180e336 NJ |
1306 | SCM exception; |
1307 | int ret = 0; | |
1308 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1309 | |
6180e336 NJ |
1310 | SCM_VALIDATE_MUTEX (1, m); |
1311 | ||
1312 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1313 | { | |
1314 | to_timespec (timeout, &cwaittime); | |
1315 | waittime = &cwaittime; | |
1316 | } | |
1317 | ||
adc085f1 | 1318 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1319 | if (!scm_is_false (exception)) |
1320 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1321 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1322 | } |
76da80e7 | 1323 | #undef FUNC_NAME |
9bc4701c | 1324 | |
a4d106c7 | 1325 | void |
661ae7ab | 1326 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1327 | { |
661ae7ab MV |
1328 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1329 | SCM_F_WIND_EXPLICITLY); | |
1330 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1331 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1332 | } |
1333 | ||
9bc4701c | 1334 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1335 | (SCM mutex), |
9bc4701c MD |
1336 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1337 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1338 | #define FUNC_NAME s_scm_try_mutex | |
1339 | { | |
6180e336 NJ |
1340 | SCM exception; |
1341 | int ret = 0; | |
1342 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1343 | |
ba1b7223 | 1344 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1345 | |
1346 | to_timespec (scm_from_int(0), &cwaittime); | |
1347 | waittime = &cwaittime; | |
74926120 | 1348 | |
adc085f1 | 1349 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1350 | if (!scm_is_false (exception)) |
1351 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1352 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1353 | } |
1354 | #undef FUNC_NAME | |
76da80e7 | 1355 | |
6180e336 NJ |
1356 | /*** Fat condition variables */ |
1357 | ||
1358 | typedef struct { | |
1359 | scm_i_pthread_mutex_t lock; | |
1360 | SCM waiting; /* the threads waiting for this condition. */ | |
1361 | } fat_cond; | |
1362 | ||
1363 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1364 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1365 | ||
1366 | static int | |
1367 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1368 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1369 | { |
6180e336 NJ |
1370 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1371 | fat_cond *c = NULL; | |
1372 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1373 | int err = 0, ret = 0; | |
9de87eea MV |
1374 | |
1375 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1376 | |
1377 | SCM owner = m->owner; | |
1378 | ||
1379 | if (!scm_is_eq (owner, scm_current_thread ())) | |
9bc4701c | 1380 | { |
adc085f1 | 1381 | if (m->level == 0) |
6180e336 NJ |
1382 | { |
1383 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1384 | { |
1385 | scm_i_pthread_mutex_unlock (&m->lock); | |
1386 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1387 | } | |
adc085f1 | 1388 | owner = scm_current_thread (); |
6180e336 NJ |
1389 | } |
1390 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1391 | { |
1392 | scm_i_pthread_mutex_unlock (&m->lock); | |
1393 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1394 | } | |
6180e336 NJ |
1395 | } |
1396 | ||
1397 | if (! (SCM_UNBNDP (cond))) | |
1398 | { | |
6180e336 NJ |
1399 | c = SCM_CONDVAR_DATA (cond); |
1400 | while (1) | |
1401 | { | |
1402 | int brk = 0; | |
1403 | ||
6180e336 NJ |
1404 | if (m->level > 0) |
1405 | m->level--; | |
adc085f1 | 1406 | if (m->level == 0) |
6180e336 | 1407 | m->owner = unblock_from_queue (m->waiting); |
adc085f1 | 1408 | |
6180e336 | 1409 | t->block_asyncs++; |
74926120 | 1410 | |
d2a51087 NJ |
1411 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1412 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1413 | |
1414 | if (err == 0) | |
1415 | { | |
1416 | ret = 1; | |
1417 | brk = 1; | |
1418 | } | |
1419 | else if (err == ETIMEDOUT) | |
1420 | { | |
1421 | ret = 0; | |
1422 | brk = 1; | |
1423 | } | |
1424 | else if (err != EINTR) | |
74926120 | 1425 | { |
6180e336 | 1426 | errno = err; |
6180e336 | 1427 | scm_syserror (NULL); |
74926120 | 1428 | } |
6180e336 NJ |
1429 | |
1430 | if (brk) | |
1431 | { | |
1432 | if (relock) | |
adc085f1 | 1433 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1434 | t->block_asyncs--; |
6180e336 NJ |
1435 | break; |
1436 | } | |
74926120 | 1437 | |
6180e336 NJ |
1438 | t->block_asyncs--; |
1439 | scm_async_click (); | |
74926120 | 1440 | |
6180e336 NJ |
1441 | scm_remember_upto_here_2 (cond, mutex); |
1442 | ||
1443 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1444 | } | |
9bc4701c | 1445 | } |
9de87eea | 1446 | else |
6180e336 NJ |
1447 | { |
1448 | if (m->level > 0) | |
1449 | m->level--; | |
74926120 | 1450 | if (m->level == 0) |
6180e336 | 1451 | m->owner = unblock_from_queue (m->waiting); |
74926120 | 1452 | |
6180e336 NJ |
1453 | scm_i_pthread_mutex_unlock (&m->lock); |
1454 | ret = 1; | |
1455 | } | |
9de87eea | 1456 | |
6180e336 | 1457 | return ret; |
9bc4701c | 1458 | } |
9bc4701c | 1459 | |
6180e336 NJ |
1460 | SCM scm_unlock_mutex (SCM mx) |
1461 | { | |
1462 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1463 | } |
9bc4701c | 1464 | |
6180e336 NJ |
1465 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1466 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1467 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1468 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1469 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1470 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1471 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1472 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1473 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1474 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1475 | { |
6180e336 NJ |
1476 | scm_t_timespec cwaittime, *waittime = NULL; |
1477 | ||
9bc4701c | 1478 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1479 | if (! (SCM_UNBNDP (cond))) |
1480 | { | |
1481 | SCM_VALIDATE_CONDVAR (2, cond); | |
1482 | ||
1483 | if (! (SCM_UNBNDP (timeout))) | |
1484 | { | |
1485 | to_timespec (timeout, &cwaittime); | |
1486 | waittime = &cwaittime; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1491 | } |
1492 | #undef FUNC_NAME | |
1493 | ||
6180e336 NJ |
1494 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1495 | (SCM obj), | |
1496 | "Return @code{#t} if @var{obj} is a mutex.") | |
1497 | #define FUNC_NAME s_scm_mutex_p | |
1498 | { | |
1499 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1500 | } | |
74926120 | 1501 | #undef FUNC_NAME |
9de87eea MV |
1502 | |
1503 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1504 | (SCM mx), | |
1505 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1506 | #define FUNC_NAME s_scm_mutex_owner | |
1507 | { | |
adc085f1 JG |
1508 | SCM owner; |
1509 | fat_mutex *m = NULL; | |
1510 | ||
9de87eea | 1511 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1512 | m = SCM_MUTEX_DATA (mx); |
1513 | scm_i_pthread_mutex_lock (&m->lock); | |
1514 | owner = m->owner; | |
1515 | scm_i_pthread_mutex_unlock (&m->lock); | |
1516 | ||
1517 | return owner; | |
9de87eea MV |
1518 | } |
1519 | #undef FUNC_NAME | |
1520 | ||
1521 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1522 | (SCM mx), | |
adc085f1 | 1523 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1524 | #define FUNC_NAME s_scm_mutex_level |
1525 | { | |
1526 | SCM_VALIDATE_MUTEX (1, mx); | |
1527 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1528 | } | |
1529 | #undef FUNC_NAME | |
1530 | ||
adc085f1 JG |
1531 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1532 | (SCM mx), | |
1533 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1534 | #define FUNC_NAME s_scm_mutex_locked_p | |
1535 | { | |
1536 | SCM_VALIDATE_MUTEX (1, mx); | |
1537 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1538 | } | |
1539 | #undef FUNC_NAME | |
9de87eea | 1540 | |
9de87eea MV |
1541 | static int |
1542 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1543 | { | |
1544 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1545 | scm_puts ("#<condition-variable ", port); | |
1546 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1547 | scm_puts (">", port); | |
1548 | return 1; | |
1549 | } | |
9bc4701c | 1550 | |
d823b11b MV |
1551 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1552 | (void), | |
1553 | "Make a new condition variable.") | |
1554 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1555 | { |
9de87eea MV |
1556 | fat_cond *c; |
1557 | SCM cv; | |
1558 | ||
1559 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1560 | c->waiting = SCM_EOL; |
1561 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1562 | c->waiting = make_queue (); | |
d823b11b | 1563 | return cv; |
5f05c406 | 1564 | } |
d823b11b | 1565 | #undef FUNC_NAME |
5f05c406 | 1566 | |
d823b11b MV |
1567 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1568 | (SCM cv, SCM mx, SCM t), | |
1569 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1570 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1571 | "is locked again when this function returns. When @var{time} is given, " | |
1572 | "it specifies a point in time where the waiting should be aborted. It " | |
1573 | "can be either a integer as returned by @code{current-time} or a pair " | |
1574 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1575 | "mutex is locked and @code{#f} is returned. When the condition " | |
1576 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1577 | "is returned. ") | |
1578 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1579 | { |
9de87eea | 1580 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1581 | |
1582 | SCM_VALIDATE_CONDVAR (1, cv); | |
1583 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1584 | |
d823b11b MV |
1585 | if (!SCM_UNBNDP (t)) |
1586 | { | |
6180e336 | 1587 | to_timespec (t, &waittime); |
9de87eea | 1588 | waitptr = &waittime; |
d823b11b MV |
1589 | } |
1590 | ||
2a1d0688 | 1591 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1592 | } |
d823b11b | 1593 | #undef FUNC_NAME |
5f05c406 | 1594 | |
9de87eea MV |
1595 | static void |
1596 | fat_cond_signal (fat_cond *c) | |
1597 | { | |
9de87eea | 1598 | unblock_from_queue (c->waiting); |
9de87eea MV |
1599 | } |
1600 | ||
d823b11b MV |
1601 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1602 | (SCM cv), | |
1603 | "Wake up one thread that is waiting for @var{cv}") | |
1604 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1605 | { |
d823b11b | 1606 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1607 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1608 | return SCM_BOOL_T; |
5f05c406 | 1609 | } |
d823b11b | 1610 | #undef FUNC_NAME |
5f05c406 | 1611 | |
9de87eea MV |
1612 | static void |
1613 | fat_cond_broadcast (fat_cond *c) | |
1614 | { | |
9de87eea MV |
1615 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1616 | ; | |
9de87eea MV |
1617 | } |
1618 | ||
d823b11b MV |
1619 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1620 | (SCM cv), | |
1621 | "Wake up all threads that are waiting for @var{cv}. ") | |
1622 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1623 | { |
d823b11b | 1624 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1625 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1626 | return SCM_BOOL_T; |
5f05c406 | 1627 | } |
d823b11b | 1628 | #undef FUNC_NAME |
5f05c406 | 1629 | |
6180e336 NJ |
1630 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1631 | (SCM obj), | |
1632 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1633 | #define FUNC_NAME s_scm_condition_variable_p | |
1634 | { | |
1635 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1636 | } | |
1637 | #undef FUNC_NAME | |
1638 | ||
6087fad9 | 1639 | |
8c2b3143 | 1640 | \f |
d823b11b MV |
1641 | /*** Select */ |
1642 | ||
8c2b3143 LC |
1643 | struct select_args |
1644 | { | |
1645 | int nfds; | |
1646 | SELECT_TYPE *read_fds; | |
1647 | SELECT_TYPE *write_fds; | |
1648 | SELECT_TYPE *except_fds; | |
1649 | struct timeval *timeout; | |
1650 | ||
1651 | int result; | |
1652 | int errno_value; | |
1653 | }; | |
1654 | ||
1655 | static void * | |
1656 | do_std_select (void *args) | |
1657 | { | |
1658 | struct select_args *select_args; | |
1659 | ||
1660 | select_args = (struct select_args *) args; | |
1661 | ||
1662 | select_args->result = | |
1663 | select (select_args->nfds, | |
1664 | select_args->read_fds, select_args->write_fds, | |
1665 | select_args->except_fds, select_args->timeout); | |
1666 | select_args->errno_value = errno; | |
1667 | ||
1668 | return NULL; | |
1669 | } | |
1670 | ||
911782b7 | 1671 | int |
9de87eea MV |
1672 | scm_std_select (int nfds, |
1673 | SELECT_TYPE *readfds, | |
1674 | SELECT_TYPE *writefds, | |
1675 | SELECT_TYPE *exceptfds, | |
1676 | struct timeval *timeout) | |
1677 | { | |
1678 | fd_set my_readfds; | |
1679 | int res, eno, wakeup_fd; | |
1680 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1681 | struct select_args args; |
9de87eea MV |
1682 | |
1683 | if (readfds == NULL) | |
1684 | { | |
1685 | FD_ZERO (&my_readfds); | |
1686 | readfds = &my_readfds; | |
1687 | } | |
1688 | ||
1689 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1690 | SCM_TICK; | |
1691 | ||
1692 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1693 | FD_SET (wakeup_fd, readfds); |
1694 | if (wakeup_fd >= nfds) | |
1695 | nfds = wakeup_fd+1; | |
9de87eea | 1696 | |
8c2b3143 LC |
1697 | args.nfds = nfds; |
1698 | args.read_fds = readfds; | |
1699 | args.write_fds = writefds; | |
1700 | args.except_fds = exceptfds; | |
1701 | args.timeout = timeout; | |
1702 | ||
1703 | /* Explicitly cooperate with the GC. */ | |
1704 | scm_without_guile (do_std_select, &args); | |
1705 | ||
1706 | res = args.result; | |
1707 | eno = args.errno_value; | |
1708 | ||
1709 | t->sleep_fd = -1; | |
9de87eea MV |
1710 | scm_i_reset_sleep (t); |
1711 | ||
1712 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1713 | { | |
1714 | char dummy; | |
634aa8de LC |
1715 | full_read (wakeup_fd, &dummy, 1); |
1716 | ||
9de87eea MV |
1717 | FD_CLR (wakeup_fd, readfds); |
1718 | res -= 1; | |
1719 | if (res == 0) | |
1720 | { | |
1721 | eno = EINTR; | |
1722 | res = -1; | |
1723 | } | |
1724 | } | |
d823b11b MV |
1725 | errno = eno; |
1726 | return res; | |
5f05c406 MV |
1727 | } |
1728 | ||
9de87eea | 1729 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1730 | |
9de87eea | 1731 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1732 | |
2956b071 LC |
1733 | /* It seems reasonable to not run procedures related to mutex and condition |
1734 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1735 | without it, and (ii) the only potential gain would be GC latency. See | |
1736 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1737 | for a discussion of the pros and cons. */ | |
1738 | ||
9bc4701c | 1739 | int |
9de87eea | 1740 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1741 | { |
9de87eea | 1742 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1743 | return res; |
1744 | } | |
1745 | ||
9de87eea | 1746 | static void |
2b829bbb | 1747 | do_unlock (void *data) |
28d52ebb | 1748 | { |
9de87eea | 1749 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1750 | } |
1751 | ||
1752 | void | |
661ae7ab | 1753 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1754 | { |
9de87eea | 1755 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1756 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1757 | } |
1758 | ||
9bc4701c | 1759 | int |
9de87eea | 1760 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1761 | { |
4cf72f0b LC |
1762 | int res; |
1763 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1764 | ||
1765 | t->held_mutex = mutex; | |
1766 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1767 | t->held_mutex = NULL; | |
1768 | ||
9bc4701c MD |
1769 | return res; |
1770 | } | |
9bc4701c | 1771 | |
76da80e7 | 1772 | int |
9de87eea MV |
1773 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1774 | scm_i_pthread_mutex_t *mutex, | |
1775 | const scm_t_timespec *wt) | |
76da80e7 | 1776 | { |
4cf72f0b LC |
1777 | int res; |
1778 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1779 | ||
1780 | t->held_mutex = mutex; | |
1781 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1782 | t->held_mutex = NULL; | |
1783 | ||
9de87eea | 1784 | return res; |
76da80e7 MV |
1785 | } |
1786 | ||
9de87eea | 1787 | #endif |
76da80e7 | 1788 | |
d823b11b | 1789 | unsigned long |
9de87eea | 1790 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1791 | { |
d823b11b MV |
1792 | struct timeval tv; |
1793 | tv.tv_usec = usecs % 1000000; | |
1794 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1795 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1796 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1797 | } |
1798 | ||
9de87eea MV |
1799 | unsigned int |
1800 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1801 | { |
d823b11b MV |
1802 | struct timeval tv; |
1803 | tv.tv_usec = 0; | |
1804 | tv.tv_sec = secs; | |
9de87eea | 1805 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1806 | return tv.tv_sec; |
6c214b62 MD |
1807 | } |
1808 | ||
d823b11b MV |
1809 | /*** Misc */ |
1810 | ||
1811 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1812 | (void), | |
1813 | "Return the thread that called this function.") | |
1814 | #define FUNC_NAME s_scm_current_thread | |
1815 | { | |
9de87eea | 1816 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1817 | } |
1818 | #undef FUNC_NAME | |
1819 | ||
9de87eea MV |
1820 | static SCM |
1821 | scm_c_make_list (size_t n, SCM fill) | |
1822 | { | |
1823 | SCM res = SCM_EOL; | |
1824 | while (n-- > 0) | |
1825 | res = scm_cons (fill, res); | |
1826 | return res; | |
1827 | } | |
1828 | ||
d823b11b MV |
1829 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1830 | (void), | |
1831 | "Return a list of all threads.") | |
9bc4701c | 1832 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1833 | { |
9de87eea MV |
1834 | /* We can not allocate while holding the thread_admin_mutex because |
1835 | of the way GC is done. | |
1836 | */ | |
1837 | int n = thread_count; | |
1838 | scm_i_thread *t; | |
1839 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1840 | |
9de87eea MV |
1841 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1842 | l = &list; | |
1843 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1844 | { | |
2e77f720 LC |
1845 | if (t != scm_i_signal_delivery_thread) |
1846 | { | |
1847 | SCM_SETCAR (*l, t->handle); | |
1848 | l = SCM_CDRLOC (*l); | |
1849 | } | |
9de87eea MV |
1850 | n--; |
1851 | } | |
1852 | *l = SCM_EOL; | |
1853 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1854 | return list; | |
d823b11b | 1855 | } |
9de87eea | 1856 | #undef FUNC_NAME |
d823b11b MV |
1857 | |
1858 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1859 | (SCM thread), | |
1860 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1861 | #define FUNC_NAME s_scm_thread_exited_p | |
1862 | { | |
7888309b | 1863 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1864 | } |
1865 | #undef FUNC_NAME | |
1866 | ||
911782b7 | 1867 | int |
d823b11b MV |
1868 | scm_c_thread_exited_p (SCM thread) |
1869 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1870 | { |
9de87eea | 1871 | scm_i_thread *t; |
d823b11b | 1872 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1873 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1874 | return t->exited; |
5f05c406 | 1875 | } |
d823b11b | 1876 | #undef FUNC_NAME |
5f05c406 | 1877 | |
9de87eea | 1878 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
1879 | static int threads_initialized_p = 0; |
1880 | ||
9bc4701c | 1881 | |
a4d106c7 MV |
1882 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1883 | */ | |
d1138028 | 1884 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 1885 | |
661ae7ab | 1886 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1887 | |
9bc4701c | 1888 | void |
661ae7ab | 1889 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1890 | { |
a4d106c7 | 1891 | if (scm_is_false (mutex)) |
661ae7ab MV |
1892 | mutex = dynwind_critical_section_mutex; |
1893 | scm_dynwind_lock_mutex (mutex); | |
1894 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1895 | } |
1896 | ||
1897 | /*** Initialization */ | |
1898 | ||
9de87eea MV |
1899 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
1900 | ||
d1138028 MV |
1901 | #if SCM_USE_PTHREAD_THREADS |
1902 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1903 | #endif | |
1904 | ||
9de87eea MV |
1905 | void |
1906 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1907 | { | |
d1138028 MV |
1908 | #if SCM_USE_PTHREAD_THREADS |
1909 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1910 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1911 | PTHREAD_MUTEX_RECURSIVE); | |
1912 | #endif | |
1913 | ||
1914 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1915 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1916 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1917 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 1918 | |
9de87eea | 1919 | guilify_self_1 (base); |
9bc4701c MD |
1920 | } |
1921 | ||
d823b11b MV |
1922 | scm_t_bits scm_tc16_thread; |
1923 | scm_t_bits scm_tc16_mutex; | |
1924 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1925 | |
7bfd3b9e | 1926 | void |
9de87eea | 1927 | scm_init_threads () |
7bfd3b9e | 1928 | { |
9de87eea | 1929 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 1930 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 1931 | |
9de87eea | 1932 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
1933 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
1934 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1935 | |
9de87eea MV |
1936 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1937 | sizeof (fat_cond)); | |
9de87eea | 1938 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 1939 | |
9de87eea MV |
1940 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1941 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1942 | threads_initialized_p = 1; |
a4d106c7 | 1943 | |
661ae7ab | 1944 | dynwind_critical_section_mutex = |
a4d106c7 | 1945 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 1946 | } |
89e00824 | 1947 | |
5f05c406 | 1948 | void |
9de87eea | 1949 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1950 | { |
9de87eea MV |
1951 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1952 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1953 | } |
1954 | ||
d823b11b | 1955 | void |
9de87eea | 1956 | scm_init_thread_procs () |
d823b11b | 1957 | { |
9de87eea | 1958 | #include "libguile/threads.x" |
d823b11b MV |
1959 | } |
1960 | ||
3c13664e LC |
1961 | \f |
1962 | /* IA64-specific things. */ | |
1963 | ||
1964 | #ifdef __ia64__ | |
1965 | # ifdef __hpux | |
1966 | # include <sys/param.h> | |
1967 | # include <sys/pstat.h> | |
1968 | void * | |
1969 | scm_ia64_register_backing_store_base (void) | |
1970 | { | |
1971 | struct pst_vm_status vm_status; | |
1972 | int i = 0; | |
1973 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
1974 | if (vm_status.pst_type == PS_RSESTACK) | |
1975 | return (void *) vm_status.pst_vaddr; | |
1976 | abort (); | |
1977 | } | |
1978 | void * | |
1979 | scm_ia64_ar_bsp (const void *ctx) | |
1980 | { | |
1981 | uint64_t bsp; | |
1982 | __uc_get_ar_bsp (ctx, &bsp); | |
1983 | return (void *) bsp; | |
1984 | } | |
1985 | # endif /* hpux */ | |
1986 | # ifdef linux | |
1987 | # include <ucontext.h> | |
1988 | void * | |
1989 | scm_ia64_register_backing_store_base (void) | |
1990 | { | |
1991 | extern void *__libc_ia64_register_backing_store_base; | |
1992 | return __libc_ia64_register_backing_store_base; | |
1993 | } | |
1994 | void * | |
1995 | scm_ia64_ar_bsp (const void *opaque) | |
1996 | { | |
1997 | const ucontext_t *ctx = opaque; | |
1998 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
1999 | } | |
2000 | # endif /* linux */ | |
2001 | #endif /* __ia64__ */ | |
2002 | ||
2003 | ||
89e00824 ML |
2004 | /* |
2005 | Local Variables: | |
2006 | c-file-style: "gnu" | |
2007 | End: | |
2008 | */ |