Commit | Line | Data |
---|---|---|
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 | |
c1d5d6d7 AW |
41 | #if HAVE_PTHREAD_NP_H |
42 | # include <pthread_np.h> | |
43 | #endif | |
44 | ||
f57fdf07 | 45 | #include <assert.h> |
32f94bf2 | 46 | #include <fcntl.h> |
d20912e6 | 47 | #include <nproc.h> |
f57fdf07 | 48 | |
d823b11b MV |
49 | #include "libguile/validate.h" |
50 | #include "libguile/root.h" | |
51 | #include "libguile/eval.h" | |
52 | #include "libguile/async.h" | |
53 | #include "libguile/ports.h" | |
54 | #include "libguile/threads.h" | |
a0599745 | 55 | #include "libguile/dynwind.h" |
d823b11b | 56 | #include "libguile/iselect.h" |
9de87eea MV |
57 | #include "libguile/fluids.h" |
58 | #include "libguile/continuations.h" | |
2b829bbb | 59 | #include "libguile/gc.h" |
9de87eea | 60 | #include "libguile/init.h" |
2e77f720 | 61 | #include "libguile/scmsigs.h" |
6180e336 | 62 | #include "libguile/strings.h" |
a0faf7dd | 63 | #include "libguile/weaks.h" |
7bfd3b9e | 64 | |
634aa8de LC |
65 | #include <full-read.h> |
66 | ||
cde24ce1 AW |
67 | |
68 | \f | |
69 | ||
70 | /* First some libgc shims. */ | |
71 | ||
72 | /* Make sure GC_fn_type is defined; it is missing from the public | |
73 | headers of GC 7.1 and earlier. */ | |
74 | #ifndef HAVE_GC_FN_TYPE | |
75 | typedef void * (* GC_fn_type) (void *); | |
76 | #endif | |
77 | ||
78 | ||
5f0d2951 AW |
79 | #ifndef GC_SUCCESS |
80 | #define GC_SUCCESS 0 | |
81 | #endif | |
82 | ||
83 | #ifndef GC_UNIMPLEMENTED | |
84 | #define GC_UNIMPLEMENTED 3 | |
85 | #endif | |
86 | ||
87 | /* Likewise struct GC_stack_base is missing before 7.1. */ | |
88 | #ifndef HAVE_GC_STACK_BASE | |
12c1d861 AW |
89 | struct GC_stack_base { |
90 | void * mem_base; /* Base of memory stack. */ | |
91 | #ifdef __ia64__ | |
92 | void * reg_base; /* Base of separate register stack. */ | |
93 | #endif | |
94 | }; | |
5f0d2951 AW |
95 | |
96 | static int | |
987b8160 | 97 | GC_register_my_thread (struct GC_stack_base *stack_base) |
5f0d2951 AW |
98 | { |
99 | return GC_UNIMPLEMENTED; | |
100 | } | |
101 | ||
102 | static void | |
103 | GC_unregister_my_thread () | |
104 | { | |
105 | } | |
106 | ||
12c1d861 AW |
107 | #if !SCM_USE_PTHREAD_THREADS |
108 | /* No threads; we can just use GC_stackbottom. */ | |
5f0d2951 | 109 | static void * |
12c1d861 AW |
110 | get_thread_stack_base () |
111 | { | |
112 | return GC_stackbottom; | |
113 | } | |
114 | ||
115 | #elif defined HAVE_PTHREAD_ATTR_GETSTACK && defined HAVE_PTHREAD_GETATTR_NP \ | |
116 | && defined PTHREAD_ATTR_GETSTACK_WORKS | |
117 | /* This method for GNU/Linux and perhaps some other systems. | |
118 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
119 | available on them. */ | |
120 | static void * | |
121 | get_thread_stack_base () | |
122 | { | |
123 | pthread_attr_t attr; | |
124 | void *start, *end; | |
125 | size_t size; | |
126 | ||
127 | pthread_getattr_np (pthread_self (), &attr); | |
128 | pthread_attr_getstack (&attr, &start, &size); | |
129 | end = (char *)start + size; | |
130 | ||
131 | #if SCM_STACK_GROWS_UP | |
132 | return start; | |
133 | #else | |
134 | return end; | |
135 | #endif | |
136 | } | |
137 | ||
138 | #elif defined HAVE_PTHREAD_GET_STACKADDR_NP | |
139 | /* This method for MacOS X. | |
140 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
141 | but as of 2006 there's nothing obvious at apple.com. */ | |
142 | static void * | |
143 | get_thread_stack_base () | |
144 | { | |
145 | return pthread_get_stackaddr_np (pthread_self ()); | |
146 | } | |
147 | ||
c1d5d6d7 AW |
148 | #elif HAVE_PTHREAD_ATTR_GET_NP |
149 | /* This one is for FreeBSD 9. */ | |
150 | static void * | |
151 | get_thread_stack_base () | |
152 | { | |
153 | pthread_attr_t attr; | |
154 | void *start, *end; | |
155 | size_t size; | |
156 | ||
157 | pthread_attr_init (&attr); | |
158 | pthread_attr_get_np (pthread_self (), &attr); | |
159 | pthread_attr_getstack (&attr, &start, &size); | |
160 | pthread_attr_destroy (&attr); | |
161 | ||
162 | end = (char *)start + size; | |
163 | ||
164 | #if SCM_STACK_GROWS_UP | |
165 | return start; | |
166 | #else | |
167 | return end; | |
168 | #endif | |
169 | } | |
170 | ||
12c1d861 AW |
171 | #else |
172 | #error Threads enabled with old BDW-GC, but missing get_thread_stack_base impl. Please upgrade to libgc >= 7.1. | |
173 | #endif | |
174 | ||
175 | static int | |
987b8160 | 176 | GC_get_stack_base (struct GC_stack_base *stack_base) |
5f0d2951 | 177 | { |
12c1d861 AW |
178 | stack_base->mem_base = get_thread_stack_base (); |
179 | #ifdef __ia64__ | |
180 | /* Calculate and store off the base of this thread's register | |
181 | backing store (RBS). Unfortunately our implementation(s) of | |
182 | scm_ia64_register_backing_store_base are only reliable for the | |
183 | main thread. For other threads, therefore, find out the current | |
184 | top of the RBS, and use that as a maximum. */ | |
185 | stack_base->reg_base = scm_ia64_register_backing_store_base (); | |
186 | { | |
187 | ucontext_t ctx; | |
188 | void *bsp; | |
189 | getcontext (&ctx); | |
190 | bsp = scm_ia64_ar_bsp (&ctx); | |
191 | if (stack_base->reg_base > bsp) | |
192 | stack_base->reg_base = bsp; | |
193 | } | |
194 | #endif | |
195 | return GC_SUCCESS; | |
5f0d2951 | 196 | } |
12c1d861 AW |
197 | |
198 | static void * | |
199 | GC_call_with_stack_base(void * (*fn) (struct GC_stack_base*, void*), void *arg) | |
200 | { | |
201 | struct GC_stack_base stack_base; | |
202 | ||
203 | stack_base.mem_base = (void*)&stack_base; | |
204 | #ifdef __ia64__ | |
205 | /* FIXME: Untested. */ | |
206 | { | |
207 | ucontext_t ctx; | |
208 | getcontext (&ctx); | |
209 | stack_base.reg_base = scm_ia64_ar_bsp (&ctx); | |
210 | } | |
5f0d2951 AW |
211 | #endif |
212 | ||
12c1d861 AW |
213 | return fn (&stack_base, arg); |
214 | } | |
215 | #endif /* HAVE_GC_STACK_BASE */ | |
216 | ||
5f0d2951 | 217 | |
cde24ce1 AW |
218 | /* Now define with_gc_active and with_gc_inactive. */ |
219 | ||
220 | #if (defined(HAVE_GC_DO_BLOCKING) && defined (HAVE_DECL_GC_DO_BLOCKING) && defined (HAVE_GC_CALL_WITH_GC_ACTIVE)) | |
221 | ||
222 | /* We have a sufficiently new libgc (7.2 or newer). */ | |
223 | ||
224 | static void* | |
225 | with_gc_inactive (GC_fn_type func, void *data) | |
226 | { | |
227 | return GC_do_blocking (func, data); | |
228 | } | |
229 | ||
230 | static void* | |
231 | with_gc_active (GC_fn_type func, void *data) | |
232 | { | |
233 | return GC_call_with_gc_active (func, data); | |
234 | } | |
235 | ||
236 | #else | |
237 | ||
238 | /* libgc not new enough, so never actually deactivate GC. | |
239 | ||
240 | Note that though GC 7.1 does have a GC_do_blocking, it doesn't have | |
241 | GC_call_with_gc_active. */ | |
242 | ||
243 | static void* | |
244 | with_gc_inactive (GC_fn_type func, void *data) | |
245 | { | |
246 | return func (data); | |
247 | } | |
248 | ||
249 | static void* | |
250 | with_gc_active (GC_fn_type func, void *data) | |
251 | { | |
252 | return func (data); | |
253 | } | |
254 | ||
255 | #endif /* HAVE_GC_DO_BLOCKING */ | |
256 | ||
257 | ||
634aa8de | 258 | \f |
6180e336 NJ |
259 | static void |
260 | to_timespec (SCM t, scm_t_timespec *waittime) | |
261 | { | |
262 | if (scm_is_pair (t)) | |
263 | { | |
264 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
265 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
266 | } | |
267 | else | |
268 | { | |
269 | double time = scm_to_double (t); | |
270 | double sec = scm_c_truncate (time); | |
271 | ||
272 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 273 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
274 | } |
275 | } | |
276 | ||
c058db8a | 277 | \f |
d823b11b | 278 | /*** Queues */ |
7bfd3b9e | 279 | |
c058db8a LC |
280 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
281 | the risk of false references leading to unbounded retained space as | |
282 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
283 | H.J. Boehm, 2001. */ | |
284 | ||
9de87eea MV |
285 | /* Make an empty queue data structure. |
286 | */ | |
d823b11b MV |
287 | static SCM |
288 | make_queue () | |
289 | { | |
290 | return scm_cons (SCM_EOL, SCM_EOL); | |
291 | } | |
7bfd3b9e | 292 | |
9de87eea MV |
293 | /* Put T at the back of Q and return a handle that can be used with |
294 | remqueue to remove T from Q again. | |
295 | */ | |
d823b11b MV |
296 | static SCM |
297 | enqueue (SCM q, SCM t) | |
298 | { | |
299 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 300 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 301 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
302 | SCM_SETCDR (q, c); |
303 | else | |
304 | SCM_SETCDR (SCM_CAR (q), c); | |
305 | SCM_SETCAR (q, c); | |
d2a51087 | 306 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
307 | return c; |
308 | } | |
7bfd3b9e | 309 | |
9de87eea MV |
310 | /* Remove the element that the handle C refers to from the queue Q. C |
311 | must have been returned from a call to enqueue. The return value | |
312 | is zero when the element referred to by C has already been removed. | |
313 | Otherwise, 1 is returned. | |
314 | */ | |
315 | static int | |
d823b11b MV |
316 | remqueue (SCM q, SCM c) |
317 | { | |
318 | SCM p, prev = q; | |
d2a51087 | 319 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 320 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 321 | { |
bc36d050 | 322 | if (scm_is_eq (p, c)) |
d823b11b | 323 | { |
bc36d050 | 324 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
325 | SCM_SETCAR (q, SCM_CDR (c)); |
326 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
327 | |
328 | /* GC-robust */ | |
329 | SCM_SETCDR (c, SCM_EOL); | |
330 | ||
d2a51087 | 331 | SCM_CRITICAL_SECTION_END; |
9de87eea | 332 | return 1; |
d823b11b MV |
333 | } |
334 | prev = p; | |
335 | } | |
d2a51087 | 336 | SCM_CRITICAL_SECTION_END; |
9de87eea | 337 | return 0; |
d823b11b MV |
338 | } |
339 | ||
9de87eea MV |
340 | /* Remove the front-most element from the queue Q and return it. |
341 | Return SCM_BOOL_F when Q is empty. | |
342 | */ | |
d823b11b MV |
343 | static SCM |
344 | dequeue (SCM q) | |
345 | { | |
d2a51087 NJ |
346 | SCM c; |
347 | SCM_CRITICAL_SECTION_START; | |
348 | c = SCM_CDR (q); | |
d2e53ed6 | 349 | if (scm_is_null (c)) |
d2a51087 NJ |
350 | { |
351 | SCM_CRITICAL_SECTION_END; | |
352 | return SCM_BOOL_F; | |
353 | } | |
d823b11b MV |
354 | else |
355 | { | |
356 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 357 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 358 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 359 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
360 | |
361 | /* GC-robust */ | |
362 | SCM_SETCDR (c, SCM_EOL); | |
363 | ||
d823b11b MV |
364 | return SCM_CAR (c); |
365 | } | |
366 | } | |
7bfd3b9e | 367 | |
9de87eea | 368 | /*** Thread smob routines */ |
76da80e7 | 369 | |
d823b11b MV |
370 | |
371 | static int | |
372 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
373 | { | |
23d72566 KR |
374 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
375 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
376 | the struct case, hence we go via a union, and extract according to the | |
377 | size of pthread_t. */ | |
378 | union { | |
379 | scm_i_pthread_t p; | |
380 | unsigned short us; | |
381 | unsigned int ui; | |
382 | unsigned long ul; | |
383 | scm_t_uintmax um; | |
384 | } u; | |
9de87eea | 385 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
386 | scm_i_pthread_t p = t->pthread; |
387 | scm_t_uintmax id; | |
388 | u.p = p; | |
389 | if (sizeof (p) == sizeof (unsigned short)) | |
390 | id = u.us; | |
391 | else if (sizeof (p) == sizeof (unsigned int)) | |
392 | id = u.ui; | |
393 | else if (sizeof (p) == sizeof (unsigned long)) | |
394 | id = u.ul; | |
395 | else | |
396 | id = u.um; | |
397 | ||
d823b11b | 398 | scm_puts ("#<thread ", port); |
23d72566 | 399 | scm_uintprint (id, 10, port); |
1b92fb6b | 400 | scm_puts (" (", port); |
0345e278 | 401 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 402 | scm_puts (")>", port); |
d823b11b MV |
403 | return 1; |
404 | } | |
405 | ||
706846f6 | 406 | \f |
9de87eea | 407 | /*** Blocking on queues. */ |
f7eca35d | 408 | |
9de87eea MV |
409 | /* See also scm_i_queue_async_cell for how such a block is |
410 | interrputed. | |
411 | */ | |
d823b11b | 412 | |
9de87eea MV |
413 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
414 | be woken up by a call to 'unblock_from_queue', or to be | |
415 | interrupted. Upon return of this function, the current thread is | |
416 | no longer on QUEUE, even when the sleep has been interrupted. | |
417 | ||
d2a51087 | 418 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
419 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
420 | ||
421 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
422 | as MUTEX is needed. | |
423 | ||
424 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
425 | ||
426 | The return value of block_self is an errno value. It will be zero | |
427 | when the sleep has been successfully completed by a call to | |
428 | unblock_from_queue, EINTR when it has been interrupted by the | |
429 | delivery of a system async, and ETIMEDOUT when the timeout has | |
430 | expired. | |
431 | ||
432 | The system asyncs themselves are not executed by block_self. | |
433 | */ | |
434 | static int | |
435 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
436 | const scm_t_timespec *waittime) | |
76da80e7 | 437 | { |
9de87eea MV |
438 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
439 | SCM q_handle; | |
440 | int err; | |
441 | ||
442 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
443 | err = EINTR; | |
444 | else | |
445 | { | |
446 | t->block_asyncs++; | |
447 | q_handle = enqueue (queue, t->handle); | |
448 | if (waittime == NULL) | |
449 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
450 | else | |
451 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
452 | ||
453 | /* When we are still on QUEUE, we have been interrupted. We | |
454 | report this only when no other error (such as a timeout) has | |
455 | happened above. | |
456 | */ | |
457 | if (remqueue (queue, q_handle) && err == 0) | |
458 | err = EINTR; | |
459 | t->block_asyncs--; | |
460 | scm_i_reset_sleep (t); | |
461 | } | |
462 | ||
463 | return err; | |
76da80e7 | 464 | } |
9de87eea | 465 | |
d2a51087 NJ |
466 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
467 | returned, or #f if the queue was empty. | |
9de87eea MV |
468 | */ |
469 | static SCM | |
470 | unblock_from_queue (SCM queue) | |
471 | { | |
472 | SCM thread = dequeue (queue); | |
473 | if (scm_is_true (thread)) | |
474 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
475 | return thread; | |
476 | } | |
477 | ||
45f15cac | 478 | \f |
9de87eea MV |
479 | /* Getting into and out of guile mode. |
480 | */ | |
481 | ||
f60a7648 AW |
482 | /* Key used to attach a cleanup handler to a given thread. Also, if |
483 | thread-local storage is unavailable, this key is used to retrieve the | |
484 | current thread with `pthread_getspecific ()'. */ | |
485 | scm_i_pthread_key_t scm_i_thread_key; | |
486 | ||
487 | ||
705edb95 LC |
488 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
489 | ||
490 | /* When thread-local storage (TLS) is available, a pointer to the | |
491 | current-thread object is kept in TLS. Note that storing the thread-object | |
492 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
493 | possible since thread objects may live longer than the actual thread they | |
494 | represent. */ | |
495 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
496 | ||
f60a7648 | 497 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 498 | |
d823b11b | 499 | |
9de87eea MV |
500 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
501 | static scm_i_thread *all_threads = NULL; | |
502 | static int thread_count; | |
503 | ||
504 | static SCM scm_i_default_dynamic_state; | |
505 | ||
0b77014f AW |
506 | /* Run when a fluid is collected. */ |
507 | void | |
aafb4ed7 | 508 | scm_i_reset_fluid (size_t n) |
0b77014f AW |
509 | { |
510 | scm_i_thread *t; | |
511 | ||
512 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
513 | for (t = all_threads; t; t = t->next_thread) | |
514 | if (SCM_I_DYNAMIC_STATE_P (t->dynamic_state)) | |
515 | { | |
516 | SCM v = SCM_I_DYNAMIC_STATE_FLUIDS (t->dynamic_state); | |
517 | ||
518 | if (n < SCM_SIMPLE_VECTOR_LENGTH (v)) | |
aafb4ed7 | 519 | SCM_SIMPLE_VECTOR_SET (v, n, SCM_UNDEFINED); |
0b77014f AW |
520 | } |
521 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
522 | } | |
523 | ||
9de87eea | 524 | /* Perform first stage of thread initialisation, in non-guile mode. |
d823b11b | 525 | */ |
9de87eea | 526 | static void |
12c1d861 | 527 | guilify_self_1 (struct GC_stack_base *base) |
d823b11b | 528 | { |
7f22442b AW |
529 | scm_i_thread t; |
530 | ||
531 | /* We must arrange for SCM_I_CURRENT_THREAD to point to a valid value | |
532 | before allocating anything in this thread, because allocation could | |
533 | cause GC to run, and GC could cause finalizers, which could invoke | |
534 | Scheme functions, which need the current thread to be set. */ | |
535 | ||
536 | t.pthread = scm_i_pthread_self (); | |
537 | t.handle = SCM_BOOL_F; | |
538 | t.result = SCM_BOOL_F; | |
539 | t.cleanup_handler = SCM_BOOL_F; | |
540 | t.mutexes = SCM_EOL; | |
541 | t.held_mutex = NULL; | |
542 | t.join_queue = SCM_EOL; | |
543 | t.dynamic_state = SCM_BOOL_F; | |
544 | t.dynwinds = SCM_EOL; | |
545 | t.active_asyncs = SCM_EOL; | |
546 | t.block_asyncs = 1; | |
547 | t.pending_asyncs = 1; | |
548 | t.critical_section_level = 0; | |
549 | t.base = base->mem_base; | |
346e4402 | 550 | #ifdef __ia64__ |
7f22442b | 551 | t.register_backing_store_base = base->reg-base; |
346e4402 | 552 | #endif |
7f22442b AW |
553 | t.continuation_root = SCM_EOL; |
554 | t.continuation_base = t.base; | |
555 | scm_i_pthread_cond_init (&t.sleep_cond, NULL); | |
556 | t.sleep_mutex = NULL; | |
557 | t.sleep_object = SCM_BOOL_F; | |
558 | t.sleep_fd = -1; | |
559 | ||
32f94bf2 | 560 | if (pipe2 (t.sleep_pipe, O_CLOEXEC) != 0) |
634aa8de LC |
561 | /* FIXME: Error conditions during the initialization phase are handled |
562 | gracelessly since public functions such as `scm_init_guile ()' | |
563 | currently have type `void'. */ | |
564 | abort (); | |
565 | ||
7f22442b AW |
566 | scm_i_pthread_mutex_init (&t.admin_mutex, NULL); |
567 | t.current_mark_stack_ptr = NULL; | |
568 | t.current_mark_stack_limit = NULL; | |
569 | t.canceled = 0; | |
570 | t.exited = 0; | |
571 | t.guile_mode = 0; | |
9de87eea | 572 | |
7f22442b AW |
573 | /* The switcheroo. */ |
574 | { | |
575 | scm_i_thread *t_ptr = &t; | |
576 | ||
577 | GC_disable (); | |
578 | t_ptr = GC_malloc (sizeof (scm_i_thread)); | |
579 | memcpy (t_ptr, &t, sizeof t); | |
580 | ||
581 | scm_i_pthread_setspecific (scm_i_thread_key, t_ptr); | |
f60a7648 AW |
582 | |
583 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
7f22442b AW |
584 | /* Cache the current thread in TLS for faster lookup. */ |
585 | scm_i_current_thread = t_ptr; | |
f60a7648 | 586 | #endif |
9de87eea | 587 | |
7f22442b AW |
588 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
589 | t_ptr->next_thread = all_threads; | |
590 | all_threads = t_ptr; | |
591 | thread_count++; | |
592 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
593 | ||
594 | GC_enable (); | |
595 | } | |
d823b11b MV |
596 | } |
597 | ||
9de87eea | 598 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 599 | */ |
9de87eea MV |
600 | static void |
601 | guilify_self_2 (SCM parent) | |
d823b11b | 602 | { |
9de87eea MV |
603 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
604 | ||
72e6b608 LC |
605 | t->guile_mode = 1; |
606 | ||
9de87eea | 607 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 608 | |
9de87eea MV |
609 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
610 | t->continuation_base = t->base; | |
2bbe1533 | 611 | t->vm = SCM_BOOL_F; |
9de87eea MV |
612 | |
613 | if (scm_is_true (parent)) | |
614 | t->dynamic_state = scm_make_dynamic_state (parent); | |
615 | else | |
616 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
617 | ||
618 | t->join_queue = make_queue (); | |
619 | t->block_asyncs = 0; | |
d823b11b MV |
620 | } |
621 | ||
6180e336 NJ |
622 | \f |
623 | /*** Fat mutexes */ | |
624 | ||
625 | /* We implement our own mutex type since we want them to be 'fair', we | |
626 | want to do fancy things while waiting for them (like running | |
627 | asyncs) and we might want to add things that are nice for | |
628 | debugging. | |
629 | */ | |
630 | ||
631 | typedef struct { | |
632 | scm_i_pthread_mutex_t lock; | |
633 | SCM owner; | |
adc085f1 | 634 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 635 | |
adc085f1 | 636 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
637 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
638 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
639 | owned by the current thread? */ | |
640 | ||
641 | SCM waiting; /* the threads waiting for this mutex. */ | |
642 | } fat_mutex; | |
643 | ||
644 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
645 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
646 | ||
2002f1f8 AW |
647 | static SCM |
648 | call_cleanup (void *data) | |
649 | { | |
650 | SCM *proc_p = data; | |
651 | return scm_call_0 (*proc_p); | |
652 | } | |
653 | ||
9de87eea | 654 | /* Perform thread tear-down, in guile mode. |
d823b11b | 655 | */ |
9de87eea MV |
656 | static void * |
657 | do_thread_exit (void *v) | |
658 | { | |
2e77f720 LC |
659 | scm_i_thread *t = (scm_i_thread *) v; |
660 | ||
91230883 LC |
661 | /* Ensure the signal handling thread has been launched, because we might be |
662 | shutting it down. This needs to be done in Guile mode. */ | |
663 | scm_i_ensure_signal_delivery_thread (); | |
664 | ||
2e77f720 LC |
665 | if (!scm_is_false (t->cleanup_handler)) |
666 | { | |
667 | SCM ptr = t->cleanup_handler; | |
668 | ||
669 | t->cleanup_handler = SCM_BOOL_F; | |
670 | t->result = scm_internal_catch (SCM_BOOL_T, | |
2002f1f8 | 671 | call_cleanup, &ptr, |
2e77f720 LC |
672 | scm_handle_by_message_noexit, NULL); |
673 | } | |
9de87eea | 674 | |
86a597f8 | 675 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
676 | |
677 | t->exited = 1; | |
0c97d7dd MV |
678 | close (t->sleep_pipe[0]); |
679 | close (t->sleep_pipe[1]); | |
9de87eea MV |
680 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
681 | ; | |
9de87eea | 682 | |
74926120 | 683 | while (!scm_is_null (t->mutexes)) |
6180e336 | 684 | { |
a0faf7dd | 685 | SCM mutex = SCM_WEAK_PAIR_CAR (t->mutexes); |
74926120 | 686 | |
a0faf7dd LC |
687 | if (!SCM_UNBNDP (mutex)) |
688 | { | |
689 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
690 | ||
691 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 LC |
692 | |
693 | /* Since MUTEX is in `t->mutexes', T must be its owner. */ | |
694 | assert (scm_is_eq (m->owner, t->handle)); | |
695 | ||
a0faf7dd | 696 | unblock_from_queue (m->waiting); |
f57fdf07 | 697 | |
a0faf7dd LC |
698 | scm_i_pthread_mutex_unlock (&m->lock); |
699 | } | |
6180e336 | 700 | |
a0faf7dd | 701 | t->mutexes = SCM_WEAK_PAIR_CDR (t->mutexes); |
6180e336 NJ |
702 | } |
703 | ||
86a597f8 | 704 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 705 | |
9de87eea MV |
706 | return NULL; |
707 | } | |
708 | ||
f60a7648 AW |
709 | static void * |
710 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
711 | { | |
7f22442b | 712 | /* Won't hurt if we are already registered. */ |
8e76ce94 | 713 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 714 | GC_register_my_thread (sb); |
8e76ce94 | 715 | #endif |
f60a7648 | 716 | |
7f22442b | 717 | return scm_with_guile (do_thread_exit, v); |
f60a7648 AW |
718 | } |
719 | ||
d823b11b | 720 | static void |
9de87eea | 721 | on_thread_exit (void *v) |
d823b11b | 722 | { |
29776e85 | 723 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 724 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 725 | |
b8441577 LC |
726 | /* If we were canceled, we were unable to clear `t->guile_mode', so do |
727 | it here. */ | |
728 | t->guile_mode = 0; | |
729 | ||
d2a51087 NJ |
730 | /* If this thread was cancelled while doing a cond wait, it will |
731 | still have a mutex locked, so we unlock it here. */ | |
732 | if (t->held_mutex) | |
733 | { | |
734 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
735 | t->held_mutex = NULL; | |
736 | } | |
737 | ||
f60a7648 AW |
738 | /* Reinstate the current thread for purposes of scm_with_guile |
739 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
740 | case but it doesn't hurt to be consistent. */ | |
741 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 742 | |
7f22442b AW |
743 | /* Scheme-level thread finalizers and other cleanup needs to happen in |
744 | guile mode. */ | |
745 | GC_call_with_stack_base (do_thread_exit_trampoline, t); | |
0c97d7dd MV |
746 | |
747 | /* Removing ourself from the list of all threads needs to happen in | |
748 | non-guile mode since all SCM values on our stack become | |
29776e85 | 749 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
750 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
751 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
752 | if (*tp == t) | |
753 | { | |
754 | *tp = t->next_thread; | |
c058db8a LC |
755 | |
756 | /* GC-robust */ | |
757 | t->next_thread = NULL; | |
758 | ||
0c97d7dd MV |
759 | break; |
760 | } | |
761 | thread_count--; | |
2e77f720 LC |
762 | |
763 | /* If there's only one other thread, it could be the signal delivery | |
764 | thread, so we need to notify it to shut down by closing its read pipe. | |
765 | If it's not the signal delivery thread, then closing the read pipe isn't | |
766 | going to hurt. */ | |
767 | if (thread_count <= 1) | |
768 | scm_i_close_signal_pipe (); | |
769 | ||
0c97d7dd MV |
770 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
771 | ||
f60a7648 | 772 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
7f22442b | 773 | |
8e76ce94 | 774 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 775 | GC_unregister_my_thread (); |
653ccd78 | 776 | #endif |
d823b11b MV |
777 | } |
778 | ||
9de87eea | 779 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 780 | |
9de87eea MV |
781 | static void |
782 | init_thread_key (void) | |
783 | { | |
f60a7648 | 784 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 785 | } |
d823b11b | 786 | |
cde24ce1 AW |
787 | /* Perform any initializations necessary to make the current thread |
788 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
789 | if necessary. | |
a54a94b3 | 790 | |
9de87eea MV |
791 | BASE is the stack base to use with GC. |
792 | ||
793 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
794 | which case the default dynamic state is used. | |
795 | ||
cde24ce1 | 796 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 797 | return 1. |
cde24ce1 AW |
798 | |
799 | Note that it could be the case that the thread was known | |
800 | to Guile, but not in guile mode (because we are within a | |
801 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
802 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
803 | |
804 | static int | |
12c1d861 | 805 | scm_i_init_thread_for_guile (struct GC_stack_base *base, SCM parent) |
d823b11b | 806 | { |
9de87eea MV |
807 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
808 | ||
cde24ce1 AW |
809 | if (SCM_I_CURRENT_THREAD) |
810 | { | |
811 | /* Thread is already known to Guile. | |
812 | */ | |
813 | return 0; | |
814 | } | |
815 | else | |
9de87eea MV |
816 | { |
817 | /* This thread has not been guilified yet. | |
818 | */ | |
819 | ||
820 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
821 | if (scm_initialized_p == 0) | |
822 | { | |
823 | /* First thread ever to enter Guile. Run the full | |
824 | initialization. | |
825 | */ | |
826 | scm_i_init_guile (base); | |
12c1d861 | 827 | |
8e76ce94 | 828 | #if defined (HAVE_GC_ALLOW_REGISTER_THREADS) && SCM_USE_PTHREAD_THREADS |
12c1d861 AW |
829 | /* Allow other threads to come in later. */ |
830 | GC_allow_register_threads (); | |
4000d064 | 831 | #endif |
12c1d861 | 832 | |
9de87eea MV |
833 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); |
834 | } | |
835 | else | |
836 | { | |
837 | /* Guile is already initialized, but this thread enters it for | |
838 | the first time. Only initialize this thread. | |
839 | */ | |
840 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
12c1d861 AW |
841 | |
842 | /* Register this thread with libgc. */ | |
8e76ce94 | 843 | #if SCM_USE_PTHREAD_THREADS |
12c1d861 | 844 | GC_register_my_thread (base); |
8e76ce94 | 845 | #endif |
12c1d861 | 846 | |
9de87eea MV |
847 | guilify_self_1 (base); |
848 | guilify_self_2 (parent); | |
849 | } | |
850 | return 1; | |
851 | } | |
d823b11b MV |
852 | } |
853 | ||
12c1d861 AW |
854 | void |
855 | scm_init_guile () | |
d823b11b | 856 | { |
12c1d861 AW |
857 | struct GC_stack_base stack_base; |
858 | ||
859 | if (GC_get_stack_base (&stack_base) == GC_SUCCESS) | |
860 | scm_i_init_thread_for_guile (&stack_base, | |
861 | scm_i_default_dynamic_state); | |
9de87eea MV |
862 | else |
863 | { | |
12c1d861 AW |
864 | fprintf (stderr, "Failed to get stack base for current thread.\n"); |
865 | exit (1); | |
9de87eea | 866 | } |
a54a94b3 MV |
867 | } |
868 | ||
12c1d861 | 869 | struct with_guile_args |
cde24ce1 AW |
870 | { |
871 | GC_fn_type func; | |
872 | void *data; | |
12c1d861 | 873 | SCM parent; |
cde24ce1 AW |
874 | }; |
875 | ||
876 | static void * | |
877 | with_guile_trampoline (void *data) | |
878 | { | |
12c1d861 | 879 | struct with_guile_args *args = data; |
cde24ce1 AW |
880 | |
881 | return scm_c_with_continuation_barrier (args->func, args->data); | |
882 | } | |
883 | ||
12c1d861 AW |
884 | static void * |
885 | with_guile_and_parent (struct GC_stack_base *base, void *data) | |
9de87eea MV |
886 | { |
887 | void *res; | |
cde24ce1 AW |
888 | int new_thread; |
889 | scm_i_thread *t; | |
12c1d861 | 890 | struct with_guile_args *args = data; |
2e77f720 | 891 | |
12c1d861 | 892 | new_thread = scm_i_init_thread_for_guile (base, args->parent); |
cde24ce1 AW |
893 | t = SCM_I_CURRENT_THREAD; |
894 | if (new_thread) | |
2e77f720 | 895 | { |
cde24ce1 AW |
896 | /* We are in Guile mode. */ |
897 | assert (t->guile_mode); | |
898 | ||
12c1d861 | 899 | res = scm_c_with_continuation_barrier (args->func, args->data); |
cde24ce1 AW |
900 | |
901 | /* Leave Guile mode. */ | |
902 | t->guile_mode = 0; | |
903 | } | |
904 | else if (t->guile_mode) | |
905 | { | |
906 | /* Already in Guile mode. */ | |
12c1d861 | 907 | res = scm_c_with_continuation_barrier (args->func, args->data); |
2e77f720 | 908 | } |
74926120 | 909 | else |
cde24ce1 | 910 | { |
cde24ce1 AW |
911 | /* We are not in Guile mode, either because we are not within a |
912 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 913 | |
cde24ce1 AW |
914 | This call to scm_with_guile() could happen from anywhere on the |
915 | stack, and in particular lower on the stack than when it was | |
916 | when this thread was first guilified. Thus, `base' must be | |
917 | updated. */ | |
918 | #if SCM_STACK_GROWS_UP | |
12c1d861 AW |
919 | if (SCM_STACK_PTR (base->mem_base) < t->base) |
920 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 921 | #else |
12c1d861 AW |
922 | if (SCM_STACK_PTR (base->mem_base) > t->base) |
923 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 924 | #endif |
72e6b608 | 925 | |
cde24ce1 | 926 | t->guile_mode = 1; |
12c1d861 | 927 | res = with_gc_active (with_guile_trampoline, args); |
cde24ce1 AW |
928 | t->guile_mode = 0; |
929 | } | |
930 | return res; | |
72e6b608 | 931 | } |
3d1af79f | 932 | |
12c1d861 AW |
933 | static void * |
934 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) | |
935 | { | |
936 | struct with_guile_args args; | |
937 | ||
938 | args.func = func; | |
939 | args.data = data; | |
940 | args.parent = parent; | |
941 | ||
942 | return GC_call_with_stack_base (with_guile_and_parent, &args); | |
943 | } | |
944 | ||
945 | void * | |
946 | scm_with_guile (void *(*func)(void *), void *data) | |
947 | { | |
948 | return scm_i_with_guile_and_parent (func, data, | |
949 | scm_i_default_dynamic_state); | |
950 | } | |
951 | ||
9de87eea MV |
952 | void * |
953 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 954 | { |
72e6b608 | 955 | void *result; |
cde24ce1 | 956 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 957 | |
cde24ce1 | 958 | if (t->guile_mode) |
72e6b608 | 959 | { |
cde24ce1 AW |
960 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
961 | result = with_gc_inactive (func, data); | |
962 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
72e6b608 LC |
963 | } |
964 | else | |
cde24ce1 | 965 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
966 | result = func (data); |
967 | ||
968 | return result; | |
9de87eea MV |
969 | } |
970 | ||
72e6b608 | 971 | \f |
9de87eea MV |
972 | /*** Thread creation */ |
973 | ||
974 | typedef struct { | |
975 | SCM parent; | |
976 | SCM thunk; | |
977 | SCM handler; | |
76da80e7 | 978 | SCM thread; |
9de87eea MV |
979 | scm_i_pthread_mutex_t mutex; |
980 | scm_i_pthread_cond_t cond; | |
981 | } launch_data; | |
d823b11b | 982 | |
9de87eea MV |
983 | static void * |
984 | really_launch (void *d) | |
985 | { | |
986 | launch_data *data = (launch_data *)d; | |
987 | SCM thunk = data->thunk, handler = data->handler; | |
988 | scm_i_thread *t; | |
d823b11b | 989 | |
9de87eea | 990 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 991 | |
9de87eea MV |
992 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
993 | data->thread = scm_current_thread (); | |
994 | scm_i_pthread_cond_signal (&data->cond); | |
995 | scm_i_pthread_mutex_unlock (&data->mutex); | |
996 | ||
997 | if (SCM_UNBNDP (handler)) | |
998 | t->result = scm_call_0 (thunk); | |
999 | else | |
1000 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
1001 | ||
1002 | return 0; | |
d823b11b MV |
1003 | } |
1004 | ||
9de87eea MV |
1005 | static void * |
1006 | launch_thread (void *d) | |
1007 | { | |
1008 | launch_data *data = (launch_data *)d; | |
1009 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1010 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
1011 | return NULL; | |
1012 | } | |
1013 | ||
1014 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 1015 | (SCM thunk, SCM handler), |
9de87eea MV |
1016 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
1017 | "returning a new thread object representing the thread. The procedure\n" | |
1018 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
1019 | "\n" | |
1020 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
1021 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
1022 | "handler. This catch is established inside the continuation barrier.\n" | |
1023 | "\n" | |
1024 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
1025 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
1026 | #define FUNC_NAME s_scm_call_with_new_thread |
1027 | { | |
9de87eea MV |
1028 | launch_data data; |
1029 | scm_i_pthread_t id; | |
1030 | int err; | |
d823b11b | 1031 | |
9de87eea MV |
1032 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
1033 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
1034 | handler, SCM_ARG2, FUNC_NAME); | |
1035 | ||
9f7537dc | 1036 | GC_collect_a_little (); |
9de87eea MV |
1037 | data.parent = scm_current_dynamic_state (); |
1038 | data.thunk = thunk; | |
1039 | data.handler = handler; | |
1040 | data.thread = SCM_BOOL_F; | |
1041 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1042 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1043 | ||
1044 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1045 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
1046 | if (err) | |
1047 | { | |
1048 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1049 | errno = err; | |
1050 | scm_syserror (NULL); | |
1051 | } | |
1052 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1053 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1054 | |
9de87eea | 1055 | return data.thread; |
d823b11b MV |
1056 | } |
1057 | #undef FUNC_NAME | |
1058 | ||
9de87eea MV |
1059 | typedef struct { |
1060 | SCM parent; | |
1061 | scm_t_catch_body body; | |
1062 | void *body_data; | |
1063 | scm_t_catch_handler handler; | |
1064 | void *handler_data; | |
1065 | SCM thread; | |
1066 | scm_i_pthread_mutex_t mutex; | |
1067 | scm_i_pthread_cond_t cond; | |
1068 | } spawn_data; | |
1069 | ||
1070 | static void * | |
1071 | really_spawn (void *d) | |
1072 | { | |
1073 | spawn_data *data = (spawn_data *)d; | |
1074 | scm_t_catch_body body = data->body; | |
1075 | void *body_data = data->body_data; | |
1076 | scm_t_catch_handler handler = data->handler; | |
1077 | void *handler_data = data->handler_data; | |
1078 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1079 | ||
1080 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1081 | data->thread = scm_current_thread (); | |
1082 | scm_i_pthread_cond_signal (&data->cond); | |
1083 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1084 | ||
1085 | if (handler == NULL) | |
1086 | t->result = body (body_data); | |
1087 | else | |
1088 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1089 | body, body_data, | |
1090 | handler, handler_data); | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | static void * | |
1096 | spawn_thread (void *d) | |
1097 | { | |
1098 | spawn_data *data = (spawn_data *)d; | |
1099 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1100 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1101 | return NULL; | |
1102 | } | |
1103 | ||
1104 | SCM | |
1105 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1106 | scm_t_catch_handler handler, void *handler_data) | |
1107 | { | |
1108 | spawn_data data; | |
1109 | scm_i_pthread_t id; | |
1110 | int err; | |
1111 | ||
1112 | data.parent = scm_current_dynamic_state (); | |
1113 | data.body = body; | |
1114 | data.body_data = body_data; | |
1115 | data.handler = handler; | |
1116 | data.handler_data = handler_data; | |
1117 | data.thread = SCM_BOOL_F; | |
1118 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1119 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1120 | ||
1121 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1122 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1123 | if (err) | |
1124 | { | |
1125 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1126 | errno = err; | |
1127 | scm_syserror (NULL); | |
1128 | } | |
1129 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1130 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1131 | |
9de87eea MV |
1132 | return data.thread; |
1133 | } | |
1134 | ||
29717c89 MD |
1135 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1136 | (), | |
1137 | "Move the calling thread to the end of the scheduling queue.") | |
1138 | #define FUNC_NAME s_scm_yield | |
1139 | { | |
9de87eea | 1140 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1141 | } |
1142 | #undef FUNC_NAME | |
1143 | ||
2e77f720 LC |
1144 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1145 | (SCM thread), | |
1146 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1147 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1148 | "been signaled to terminate, this function is a no-op.") | |
1149 | #define FUNC_NAME s_scm_cancel_thread | |
1150 | { | |
1151 | scm_i_thread *t = NULL; | |
1152 | ||
1153 | SCM_VALIDATE_THREAD (1, thread); | |
1154 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1155 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1156 | if (!t->canceled) |
1157 | { | |
1158 | t->canceled = 1; | |
86a597f8 | 1159 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1160 | scm_i_pthread_cancel (t->pthread); |
1161 | } | |
1162 | else | |
86a597f8 | 1163 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1164 | |
1165 | return SCM_UNSPECIFIED; | |
1166 | } | |
1167 | #undef FUNC_NAME | |
1168 | ||
1169 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1170 | (SCM thread, SCM proc), | |
1171 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1172 | "This handler will be called when the thread exits.") | |
1173 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1174 | { | |
1175 | scm_i_thread *t; | |
1176 | ||
1177 | SCM_VALIDATE_THREAD (1, thread); | |
1178 | if (!scm_is_false (proc)) | |
1179 | SCM_VALIDATE_THUNK (2, proc); | |
1180 | ||
2e77f720 | 1181 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1182 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1183 | ||
2e77f720 LC |
1184 | if (!(t->exited || t->canceled)) |
1185 | t->cleanup_handler = proc; | |
1186 | ||
86a597f8 | 1187 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1188 | |
1189 | return SCM_UNSPECIFIED; | |
1190 | } | |
1191 | #undef FUNC_NAME | |
1192 | ||
1193 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1194 | (SCM thread), | |
1195 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1196 | #define FUNC_NAME s_scm_thread_cleanup | |
1197 | { | |
1198 | scm_i_thread *t; | |
1199 | SCM ret; | |
1200 | ||
1201 | SCM_VALIDATE_THREAD (1, thread); | |
1202 | ||
2e77f720 | 1203 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1204 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1205 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1206 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1207 | |
1208 | return ret; | |
1209 | } | |
1210 | #undef FUNC_NAME | |
1211 | ||
6180e336 NJ |
1212 | SCM scm_join_thread (SCM thread) |
1213 | { | |
1214 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1215 | } | |
1216 | ||
1217 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1218 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1219 | "Suspend execution of the calling thread until the target @var{thread} " |
1220 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1221 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1222 | { |
9de87eea | 1223 | scm_i_thread *t; |
6180e336 NJ |
1224 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1225 | SCM res = SCM_BOOL_F; | |
1226 | ||
1227 | if (! (SCM_UNBNDP (timeoutval))) | |
1228 | res = timeoutval; | |
d823b11b MV |
1229 | |
1230 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1231 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1232 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1233 | |
9de87eea | 1234 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1235 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1236 | ||
6180e336 NJ |
1237 | if (! SCM_UNBNDP (timeout)) |
1238 | { | |
1239 | to_timespec (timeout, &ctimeout); | |
1240 | timeout_ptr = &ctimeout; | |
1241 | } | |
1242 | ||
1243 | if (t->exited) | |
1244 | res = t->result; | |
1245 | else | |
d823b11b | 1246 | { |
9de87eea MV |
1247 | while (1) |
1248 | { | |
74926120 | 1249 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1250 | timeout_ptr); |
1251 | if (err == 0) | |
1252 | { | |
1253 | if (t->exited) | |
1254 | { | |
1255 | res = t->result; | |
1256 | break; | |
1257 | } | |
1258 | } | |
1259 | else if (err == ETIMEDOUT) | |
9de87eea | 1260 | break; |
6180e336 | 1261 | |
86a597f8 | 1262 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1263 | SCM_TICK; |
86a597f8 | 1264 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1265 | |
1266 | /* Check for exit again, since we just released and | |
1267 | reacquired the admin mutex, before the next block_self | |
1268 | call (which would block forever if t has already | |
1269 | exited). */ | |
1270 | if (t->exited) | |
1271 | { | |
1272 | res = t->result; | |
1273 | break; | |
1274 | } | |
9de87eea | 1275 | } |
d823b11b | 1276 | } |
9de87eea | 1277 | |
86a597f8 | 1278 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1279 | |
d823b11b | 1280 | return res; |
5f05c406 MV |
1281 | } |
1282 | #undef FUNC_NAME | |
1283 | ||
6180e336 NJ |
1284 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1285 | (SCM obj), | |
1286 | "Return @code{#t} if @var{obj} is a thread.") | |
1287 | #define FUNC_NAME s_scm_thread_p | |
1288 | { | |
1289 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1290 | } | |
1291 | #undef FUNC_NAME | |
5f05c406 | 1292 | |
4079f87e | 1293 | |
9de87eea MV |
1294 | static size_t |
1295 | fat_mutex_free (SCM mx) | |
76da80e7 | 1296 | { |
9de87eea MV |
1297 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1298 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | static int | |
9de87eea | 1303 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1304 | { |
9de87eea MV |
1305 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1306 | scm_puts ("#<mutex ", port); | |
1307 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1308 | scm_puts (">", port); | |
1309 | return 1; | |
76da80e7 MV |
1310 | } |
1311 | ||
76da80e7 | 1312 | static SCM |
6180e336 | 1313 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1314 | { |
9de87eea MV |
1315 | fat_mutex *m; |
1316 | SCM mx; | |
1317 | ||
1318 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1319 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1320 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1321 | m->level = 0; |
6180e336 | 1322 | |
adc085f1 | 1323 | m->recursive = recursive; |
6180e336 NJ |
1324 | m->unchecked_unlock = unchecked_unlock; |
1325 | m->allow_external_unlock = external_unlock; | |
1326 | ||
9de87eea MV |
1327 | m->waiting = SCM_EOL; |
1328 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1329 | m->waiting = make_queue (); | |
1330 | return mx; | |
76da80e7 MV |
1331 | } |
1332 | ||
6180e336 NJ |
1333 | SCM scm_make_mutex (void) |
1334 | { | |
1335 | return scm_make_mutex_with_flags (SCM_EOL); | |
1336 | } | |
1337 | ||
2a1d0688 NJ |
1338 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1339 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1340 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1341 | |
1342 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1343 | (SCM flags), | |
9de87eea | 1344 | "Create a new mutex. ") |
6180e336 | 1345 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1346 | { |
6180e336 NJ |
1347 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1348 | ||
1349 | SCM ptr = flags; | |
1350 | while (! scm_is_null (ptr)) | |
1351 | { | |
1352 | SCM flag = SCM_CAR (ptr); | |
1353 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1354 | unchecked_unlock = 1; | |
1355 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1356 | external_unlock = 1; | |
1357 | else if (scm_is_eq (flag, recursive_sym)) | |
1358 | recursive = 1; | |
74926120 | 1359 | else |
2a1d0688 | 1360 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1361 | ptr = SCM_CDR (ptr); |
1362 | } | |
1363 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1364 | } |
1365 | #undef FUNC_NAME | |
1366 | ||
9de87eea | 1367 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1368 | (void), |
9de87eea MV |
1369 | "Create a new recursive mutex. ") |
1370 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1371 | { |
6180e336 | 1372 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1373 | } |
1374 | #undef FUNC_NAME | |
1375 | ||
6180e336 NJ |
1376 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1377 | ||
1378 | static SCM | |
adc085f1 | 1379 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1380 | { |
1381 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1382 | |
adc085f1 | 1383 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1384 | SCM err = SCM_BOOL_F; |
1385 | ||
1386 | struct timeval current_time; | |
9de87eea MV |
1387 | |
1388 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1389 | |
1390 | while (1) | |
9de87eea | 1391 | { |
adc085f1 | 1392 | if (m->level == 0) |
6180e336 | 1393 | { |
adc085f1 | 1394 | m->owner = new_owner; |
6180e336 | 1395 | m->level++; |
74926120 | 1396 | |
adc085f1 | 1397 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1398 | { |
adc085f1 | 1399 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
ccb80964 | 1400 | |
4f39f31e LC |
1401 | /* FIXME: The order in which `t->admin_mutex' and |
1402 | `m->lock' are taken differs from that in | |
1403 | `on_thread_exit', potentially leading to deadlocks. */ | |
6180e336 | 1404 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1405 | |
1406 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1407 | retained when not referenced elsewhere (bug #27450). |
1408 | The weak pair itself is eventually removed when MUTEX | |
1409 | is unlocked. Note that `t->mutexes' lists mutexes | |
1410 | currently held by T, so it should be small. */ | |
a0faf7dd LC |
1411 | t->mutexes = scm_weak_car_pair (mutex, t->mutexes); |
1412 | ||
6180e336 | 1413 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1414 | } |
adc085f1 JG |
1415 | *ret = 1; |
1416 | break; | |
1417 | } | |
1418 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1419 | { | |
1420 | m->owner = new_owner; | |
1421 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1422 | scm_from_locale_string ("lock obtained on abandoned " | |
1423 | "mutex")); | |
1424 | *ret = 1; | |
1425 | break; | |
1426 | } | |
1427 | else if (scm_is_eq (m->owner, new_owner)) | |
1428 | { | |
1429 | if (m->recursive) | |
1430 | { | |
1431 | m->level++; | |
74926120 | 1432 | *ret = 1; |
adc085f1 JG |
1433 | } |
1434 | else | |
6180e336 | 1435 | { |
adc085f1 JG |
1436 | err = scm_cons (scm_misc_error_key, |
1437 | scm_from_locale_string ("mutex already locked " | |
1438 | "by thread")); | |
1439 | *ret = 0; | |
1440 | } | |
74926120 | 1441 | break; |
adc085f1 | 1442 | } |
9de87eea | 1443 | else |
9de87eea | 1444 | { |
74926120 | 1445 | if (timeout != NULL) |
adc085f1 JG |
1446 | { |
1447 | gettimeofday (¤t_time, NULL); | |
1448 | if (current_time.tv_sec > timeout->tv_sec || | |
1449 | (current_time.tv_sec == timeout->tv_sec && | |
1450 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1451 | { |
adc085f1 JG |
1452 | *ret = 0; |
1453 | break; | |
6180e336 | 1454 | } |
6180e336 | 1455 | } |
37a52039 | 1456 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1457 | scm_i_pthread_mutex_unlock (&m->lock); |
1458 | SCM_TICK; | |
1459 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1460 | } | |
1461 | } | |
1462 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1463 | return err; |
9de87eea MV |
1464 | } |
1465 | ||
6180e336 NJ |
1466 | SCM scm_lock_mutex (SCM mx) |
1467 | { | |
adc085f1 | 1468 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1469 | } |
1470 | ||
adc085f1 JG |
1471 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1472 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1473 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1474 | "blocks until the mutex becomes available. The function returns when " | |
1475 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1476 | "a thread already owns will succeed right away and will not block the " | |
1477 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1478 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1479 | { |
6180e336 NJ |
1480 | SCM exception; |
1481 | int ret = 0; | |
1482 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1483 | |
6180e336 NJ |
1484 | SCM_VALIDATE_MUTEX (1, m); |
1485 | ||
1486 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1487 | { | |
1488 | to_timespec (timeout, &cwaittime); | |
1489 | waittime = &cwaittime; | |
1490 | } | |
1491 | ||
97ec95b7 LC |
1492 | if (!SCM_UNBNDP (owner) && !scm_is_false (owner)) |
1493 | SCM_VALIDATE_THREAD (3, owner); | |
1494 | ||
adc085f1 | 1495 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1496 | if (!scm_is_false (exception)) |
1497 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1498 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1499 | } |
76da80e7 | 1500 | #undef FUNC_NAME |
9bc4701c | 1501 | |
2a3db25e MW |
1502 | static void |
1503 | lock_mutex_return_void (SCM mx) | |
1504 | { | |
1505 | (void) scm_lock_mutex (mx); | |
1506 | } | |
1507 | ||
1508 | static void | |
1509 | unlock_mutex_return_void (SCM mx) | |
1510 | { | |
1511 | (void) scm_unlock_mutex (mx); | |
1512 | } | |
1513 | ||
a4d106c7 | 1514 | void |
661ae7ab | 1515 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1516 | { |
2a3db25e | 1517 | scm_dynwind_unwind_handler_with_scm (unlock_mutex_return_void, mutex, |
661ae7ab | 1518 | SCM_F_WIND_EXPLICITLY); |
2a3db25e | 1519 | scm_dynwind_rewind_handler_with_scm (lock_mutex_return_void, mutex, |
661ae7ab | 1520 | SCM_F_WIND_EXPLICITLY); |
a4d106c7 MV |
1521 | } |
1522 | ||
9bc4701c | 1523 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1524 | (SCM mutex), |
9bc4701c MD |
1525 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1526 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1527 | #define FUNC_NAME s_scm_try_mutex | |
1528 | { | |
6180e336 NJ |
1529 | SCM exception; |
1530 | int ret = 0; | |
1531 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1532 | |
ba1b7223 | 1533 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1534 | |
1535 | to_timespec (scm_from_int(0), &cwaittime); | |
1536 | waittime = &cwaittime; | |
74926120 | 1537 | |
adc085f1 | 1538 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1539 | if (!scm_is_false (exception)) |
1540 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1541 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1542 | } |
1543 | #undef FUNC_NAME | |
76da80e7 | 1544 | |
6180e336 NJ |
1545 | /*** Fat condition variables */ |
1546 | ||
1547 | typedef struct { | |
1548 | scm_i_pthread_mutex_t lock; | |
1549 | SCM waiting; /* the threads waiting for this condition. */ | |
1550 | } fat_cond; | |
1551 | ||
1552 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1553 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1554 | ||
1555 | static int | |
1556 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1557 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1558 | { |
7f991c7d | 1559 | SCM owner; |
6180e336 NJ |
1560 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1561 | fat_cond *c = NULL; | |
1562 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1563 | int err = 0, ret = 0; | |
9de87eea MV |
1564 | |
1565 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1566 | |
7f991c7d | 1567 | owner = m->owner; |
adc085f1 | 1568 | |
d31ae2c3 | 1569 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1570 | { |
adc085f1 | 1571 | if (m->level == 0) |
6180e336 NJ |
1572 | { |
1573 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1574 | { |
1575 | scm_i_pthread_mutex_unlock (&m->lock); | |
1576 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1577 | } | |
d31ae2c3 | 1578 | owner = t->handle; |
6180e336 NJ |
1579 | } |
1580 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1581 | { |
1582 | scm_i_pthread_mutex_unlock (&m->lock); | |
1583 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1584 | } | |
6180e336 NJ |
1585 | } |
1586 | ||
1587 | if (! (SCM_UNBNDP (cond))) | |
1588 | { | |
6180e336 NJ |
1589 | c = SCM_CONDVAR_DATA (cond); |
1590 | while (1) | |
1591 | { | |
1592 | int brk = 0; | |
1593 | ||
6180e336 NJ |
1594 | if (m->level > 0) |
1595 | m->level--; | |
adc085f1 | 1596 | if (m->level == 0) |
f57fdf07 LC |
1597 | { |
1598 | /* Change the owner of MUTEX. */ | |
1599 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1600 | m->owner = unblock_from_queue (m->waiting); | |
1601 | } | |
adc085f1 | 1602 | |
6180e336 | 1603 | t->block_asyncs++; |
74926120 | 1604 | |
d2a51087 NJ |
1605 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1606 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1607 | |
1608 | if (err == 0) | |
1609 | { | |
1610 | ret = 1; | |
1611 | brk = 1; | |
1612 | } | |
1613 | else if (err == ETIMEDOUT) | |
1614 | { | |
1615 | ret = 0; | |
1616 | brk = 1; | |
1617 | } | |
1618 | else if (err != EINTR) | |
74926120 | 1619 | { |
6180e336 | 1620 | errno = err; |
6180e336 | 1621 | scm_syserror (NULL); |
74926120 | 1622 | } |
6180e336 NJ |
1623 | |
1624 | if (brk) | |
1625 | { | |
1626 | if (relock) | |
adc085f1 | 1627 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1628 | t->block_asyncs--; |
6180e336 NJ |
1629 | break; |
1630 | } | |
74926120 | 1631 | |
6180e336 NJ |
1632 | t->block_asyncs--; |
1633 | scm_async_click (); | |
74926120 | 1634 | |
6180e336 NJ |
1635 | scm_remember_upto_here_2 (cond, mutex); |
1636 | ||
1637 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1638 | } | |
9bc4701c | 1639 | } |
9de87eea | 1640 | else |
6180e336 NJ |
1641 | { |
1642 | if (m->level > 0) | |
1643 | m->level--; | |
74926120 | 1644 | if (m->level == 0) |
f57fdf07 LC |
1645 | { |
1646 | /* Change the owner of MUTEX. */ | |
1647 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1648 | m->owner = unblock_from_queue (m->waiting); | |
1649 | } | |
74926120 | 1650 | |
6180e336 NJ |
1651 | scm_i_pthread_mutex_unlock (&m->lock); |
1652 | ret = 1; | |
1653 | } | |
9de87eea | 1654 | |
6180e336 | 1655 | return ret; |
9bc4701c | 1656 | } |
9bc4701c | 1657 | |
6180e336 NJ |
1658 | SCM scm_unlock_mutex (SCM mx) |
1659 | { | |
1660 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1661 | } |
9bc4701c | 1662 | |
6180e336 NJ |
1663 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1664 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1665 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1666 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1667 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1668 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1669 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1670 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1671 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1672 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1673 | { |
6180e336 NJ |
1674 | scm_t_timespec cwaittime, *waittime = NULL; |
1675 | ||
9bc4701c | 1676 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1677 | if (! (SCM_UNBNDP (cond))) |
1678 | { | |
1679 | SCM_VALIDATE_CONDVAR (2, cond); | |
1680 | ||
1681 | if (! (SCM_UNBNDP (timeout))) | |
1682 | { | |
1683 | to_timespec (timeout, &cwaittime); | |
1684 | waittime = &cwaittime; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1689 | } |
1690 | #undef FUNC_NAME | |
1691 | ||
6180e336 NJ |
1692 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1693 | (SCM obj), | |
1694 | "Return @code{#t} if @var{obj} is a mutex.") | |
1695 | #define FUNC_NAME s_scm_mutex_p | |
1696 | { | |
1697 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1698 | } | |
74926120 | 1699 | #undef FUNC_NAME |
9de87eea MV |
1700 | |
1701 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1702 | (SCM mx), | |
1703 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1704 | #define FUNC_NAME s_scm_mutex_owner | |
1705 | { | |
adc085f1 JG |
1706 | SCM owner; |
1707 | fat_mutex *m = NULL; | |
1708 | ||
9de87eea | 1709 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1710 | m = SCM_MUTEX_DATA (mx); |
1711 | scm_i_pthread_mutex_lock (&m->lock); | |
1712 | owner = m->owner; | |
1713 | scm_i_pthread_mutex_unlock (&m->lock); | |
1714 | ||
1715 | return owner; | |
9de87eea MV |
1716 | } |
1717 | #undef FUNC_NAME | |
1718 | ||
1719 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1720 | (SCM mx), | |
adc085f1 | 1721 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1722 | #define FUNC_NAME s_scm_mutex_level |
1723 | { | |
1724 | SCM_VALIDATE_MUTEX (1, mx); | |
1725 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1726 | } | |
1727 | #undef FUNC_NAME | |
1728 | ||
adc085f1 JG |
1729 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1730 | (SCM mx), | |
1731 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1732 | #define FUNC_NAME s_scm_mutex_locked_p | |
1733 | { | |
1734 | SCM_VALIDATE_MUTEX (1, mx); | |
1735 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1736 | } | |
1737 | #undef FUNC_NAME | |
9de87eea | 1738 | |
9de87eea MV |
1739 | static int |
1740 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1741 | { | |
1742 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1743 | scm_puts ("#<condition-variable ", port); | |
1744 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1745 | scm_puts (">", port); | |
1746 | return 1; | |
1747 | } | |
9bc4701c | 1748 | |
d823b11b MV |
1749 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1750 | (void), | |
1751 | "Make a new condition variable.") | |
1752 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1753 | { |
9de87eea MV |
1754 | fat_cond *c; |
1755 | SCM cv; | |
1756 | ||
1757 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1758 | c->waiting = SCM_EOL; |
1759 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1760 | c->waiting = make_queue (); | |
d823b11b | 1761 | return cv; |
5f05c406 | 1762 | } |
d823b11b | 1763 | #undef FUNC_NAME |
5f05c406 | 1764 | |
d823b11b MV |
1765 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1766 | (SCM cv, SCM mx, SCM t), | |
1767 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1768 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1769 | "is locked again when this function returns. When @var{time} is given, " | |
1770 | "it specifies a point in time where the waiting should be aborted. It " | |
1771 | "can be either a integer as returned by @code{current-time} or a pair " | |
1772 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1773 | "mutex is locked and @code{#f} is returned. When the condition " | |
1774 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1775 | "is returned. ") | |
1776 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1777 | { |
9de87eea | 1778 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1779 | |
1780 | SCM_VALIDATE_CONDVAR (1, cv); | |
1781 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1782 | |
d823b11b MV |
1783 | if (!SCM_UNBNDP (t)) |
1784 | { | |
6180e336 | 1785 | to_timespec (t, &waittime); |
9de87eea | 1786 | waitptr = &waittime; |
d823b11b MV |
1787 | } |
1788 | ||
2a1d0688 | 1789 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1790 | } |
d823b11b | 1791 | #undef FUNC_NAME |
5f05c406 | 1792 | |
9de87eea MV |
1793 | static void |
1794 | fat_cond_signal (fat_cond *c) | |
1795 | { | |
9de87eea | 1796 | unblock_from_queue (c->waiting); |
9de87eea MV |
1797 | } |
1798 | ||
d823b11b MV |
1799 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1800 | (SCM cv), | |
1801 | "Wake up one thread that is waiting for @var{cv}") | |
1802 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1803 | { |
d823b11b | 1804 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1805 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1806 | return SCM_BOOL_T; |
5f05c406 | 1807 | } |
d823b11b | 1808 | #undef FUNC_NAME |
5f05c406 | 1809 | |
9de87eea MV |
1810 | static void |
1811 | fat_cond_broadcast (fat_cond *c) | |
1812 | { | |
9de87eea MV |
1813 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1814 | ; | |
9de87eea MV |
1815 | } |
1816 | ||
d823b11b MV |
1817 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1818 | (SCM cv), | |
1819 | "Wake up all threads that are waiting for @var{cv}. ") | |
1820 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1821 | { |
d823b11b | 1822 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1823 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1824 | return SCM_BOOL_T; |
5f05c406 | 1825 | } |
d823b11b | 1826 | #undef FUNC_NAME |
5f05c406 | 1827 | |
6180e336 NJ |
1828 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1829 | (SCM obj), | |
1830 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1831 | #define FUNC_NAME s_scm_condition_variable_p | |
1832 | { | |
1833 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1834 | } | |
1835 | #undef FUNC_NAME | |
1836 | ||
6087fad9 | 1837 | |
8c2b3143 | 1838 | \f |
d823b11b MV |
1839 | /*** Select */ |
1840 | ||
8c2b3143 LC |
1841 | struct select_args |
1842 | { | |
1843 | int nfds; | |
1844 | SELECT_TYPE *read_fds; | |
1845 | SELECT_TYPE *write_fds; | |
1846 | SELECT_TYPE *except_fds; | |
1847 | struct timeval *timeout; | |
1848 | ||
1849 | int result; | |
1850 | int errno_value; | |
1851 | }; | |
1852 | ||
1853 | static void * | |
1854 | do_std_select (void *args) | |
1855 | { | |
1856 | struct select_args *select_args; | |
1857 | ||
1858 | select_args = (struct select_args *) args; | |
1859 | ||
1860 | select_args->result = | |
1861 | select (select_args->nfds, | |
1862 | select_args->read_fds, select_args->write_fds, | |
1863 | select_args->except_fds, select_args->timeout); | |
1864 | select_args->errno_value = errno; | |
1865 | ||
1866 | return NULL; | |
1867 | } | |
1868 | ||
911782b7 | 1869 | int |
9de87eea MV |
1870 | scm_std_select (int nfds, |
1871 | SELECT_TYPE *readfds, | |
1872 | SELECT_TYPE *writefds, | |
1873 | SELECT_TYPE *exceptfds, | |
1874 | struct timeval *timeout) | |
1875 | { | |
1876 | fd_set my_readfds; | |
1877 | int res, eno, wakeup_fd; | |
1878 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1879 | struct select_args args; |
9de87eea MV |
1880 | |
1881 | if (readfds == NULL) | |
1882 | { | |
1883 | FD_ZERO (&my_readfds); | |
1884 | readfds = &my_readfds; | |
1885 | } | |
1886 | ||
1887 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1888 | SCM_TICK; | |
1889 | ||
1890 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1891 | FD_SET (wakeup_fd, readfds); |
1892 | if (wakeup_fd >= nfds) | |
1893 | nfds = wakeup_fd+1; | |
9de87eea | 1894 | |
8c2b3143 LC |
1895 | args.nfds = nfds; |
1896 | args.read_fds = readfds; | |
1897 | args.write_fds = writefds; | |
1898 | args.except_fds = exceptfds; | |
1899 | args.timeout = timeout; | |
1900 | ||
1901 | /* Explicitly cooperate with the GC. */ | |
1902 | scm_without_guile (do_std_select, &args); | |
1903 | ||
1904 | res = args.result; | |
1905 | eno = args.errno_value; | |
1906 | ||
1907 | t->sleep_fd = -1; | |
9de87eea MV |
1908 | scm_i_reset_sleep (t); |
1909 | ||
1910 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1911 | { | |
1912 | char dummy; | |
634aa8de LC |
1913 | full_read (wakeup_fd, &dummy, 1); |
1914 | ||
9de87eea MV |
1915 | FD_CLR (wakeup_fd, readfds); |
1916 | res -= 1; | |
1917 | if (res == 0) | |
1918 | { | |
1919 | eno = EINTR; | |
1920 | res = -1; | |
1921 | } | |
1922 | } | |
d823b11b MV |
1923 | errno = eno; |
1924 | return res; | |
5f05c406 MV |
1925 | } |
1926 | ||
9de87eea | 1927 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1928 | |
9de87eea | 1929 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1930 | |
2956b071 LC |
1931 | /* It seems reasonable to not run procedures related to mutex and condition |
1932 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1933 | without it, and (ii) the only potential gain would be GC latency. See | |
1934 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1935 | for a discussion of the pros and cons. */ | |
1936 | ||
9bc4701c | 1937 | int |
9de87eea | 1938 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1939 | { |
9de87eea | 1940 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1941 | return res; |
1942 | } | |
1943 | ||
9de87eea | 1944 | static void |
2b829bbb | 1945 | do_unlock (void *data) |
28d52ebb | 1946 | { |
9de87eea | 1947 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1948 | } |
1949 | ||
1950 | void | |
661ae7ab | 1951 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1952 | { |
9de87eea | 1953 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1954 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1955 | } |
1956 | ||
9bc4701c | 1957 | int |
9de87eea | 1958 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1959 | { |
4cf72f0b LC |
1960 | int res; |
1961 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1962 | ||
1963 | t->held_mutex = mutex; | |
1964 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1965 | t->held_mutex = NULL; | |
1966 | ||
9bc4701c MD |
1967 | return res; |
1968 | } | |
9bc4701c | 1969 | |
76da80e7 | 1970 | int |
9de87eea MV |
1971 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1972 | scm_i_pthread_mutex_t *mutex, | |
1973 | const scm_t_timespec *wt) | |
76da80e7 | 1974 | { |
4cf72f0b LC |
1975 | int res; |
1976 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1977 | ||
1978 | t->held_mutex = mutex; | |
1979 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1980 | t->held_mutex = NULL; | |
1981 | ||
9de87eea | 1982 | return res; |
76da80e7 MV |
1983 | } |
1984 | ||
9de87eea | 1985 | #endif |
76da80e7 | 1986 | |
d823b11b | 1987 | unsigned long |
9de87eea | 1988 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1989 | { |
d823b11b MV |
1990 | struct timeval tv; |
1991 | tv.tv_usec = usecs % 1000000; | |
1992 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1993 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1994 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1995 | } |
1996 | ||
9de87eea MV |
1997 | unsigned int |
1998 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1999 | { |
d823b11b MV |
2000 | struct timeval tv; |
2001 | tv.tv_usec = 0; | |
2002 | tv.tv_sec = secs; | |
9de87eea | 2003 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 2004 | return tv.tv_sec; |
6c214b62 MD |
2005 | } |
2006 | ||
d823b11b MV |
2007 | /*** Misc */ |
2008 | ||
2009 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
2010 | (void), | |
2011 | "Return the thread that called this function.") | |
2012 | #define FUNC_NAME s_scm_current_thread | |
2013 | { | |
9de87eea | 2014 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
2015 | } |
2016 | #undef FUNC_NAME | |
2017 | ||
9de87eea MV |
2018 | static SCM |
2019 | scm_c_make_list (size_t n, SCM fill) | |
2020 | { | |
2021 | SCM res = SCM_EOL; | |
2022 | while (n-- > 0) | |
2023 | res = scm_cons (fill, res); | |
2024 | return res; | |
2025 | } | |
2026 | ||
d823b11b MV |
2027 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
2028 | (void), | |
2029 | "Return a list of all threads.") | |
9bc4701c | 2030 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 2031 | { |
9de87eea MV |
2032 | /* We can not allocate while holding the thread_admin_mutex because |
2033 | of the way GC is done. | |
2034 | */ | |
2035 | int n = thread_count; | |
2036 | scm_i_thread *t; | |
2037 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 2038 | |
9de87eea MV |
2039 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
2040 | l = &list; | |
2041 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
2042 | { | |
2e77f720 LC |
2043 | if (t != scm_i_signal_delivery_thread) |
2044 | { | |
2045 | SCM_SETCAR (*l, t->handle); | |
2046 | l = SCM_CDRLOC (*l); | |
2047 | } | |
9de87eea MV |
2048 | n--; |
2049 | } | |
2050 | *l = SCM_EOL; | |
2051 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
2052 | return list; | |
d823b11b | 2053 | } |
9de87eea | 2054 | #undef FUNC_NAME |
d823b11b MV |
2055 | |
2056 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
2057 | (SCM thread), | |
2058 | "Return @code{#t} iff @var{thread} has exited.\n") | |
2059 | #define FUNC_NAME s_scm_thread_exited_p | |
2060 | { | |
7888309b | 2061 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
2062 | } |
2063 | #undef FUNC_NAME | |
2064 | ||
911782b7 | 2065 | int |
d823b11b MV |
2066 | scm_c_thread_exited_p (SCM thread) |
2067 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 2068 | { |
9de87eea | 2069 | scm_i_thread *t; |
d823b11b | 2070 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 2071 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 2072 | return t->exited; |
5f05c406 | 2073 | } |
d823b11b | 2074 | #undef FUNC_NAME |
5f05c406 | 2075 | |
d20912e6 LC |
2076 | SCM_DEFINE (scm_total_processor_count, "total-processor-count", 0, 0, 0, |
2077 | (void), | |
2078 | "Return the total number of processors of the machine, which\n" | |
2079 | "is guaranteed to be at least 1. A ``processor'' here is a\n" | |
2080 | "thread execution unit, which can be either:\n\n" | |
2081 | "@itemize\n" | |
2082 | "@item an execution core in a (possibly multi-core) chip, in a\n" | |
2083 | " (possibly multi- chip) module, in a single computer, or\n" | |
2084 | "@item a thread execution unit inside a core in the case of\n" | |
2085 | " @dfn{hyper-threaded} CPUs.\n" | |
2086 | "@end itemize\n\n" | |
2087 | "Which of the two definitions is used, is unspecified.\n") | |
2088 | #define FUNC_NAME s_scm_total_processor_count | |
2089 | { | |
2090 | return scm_from_ulong (num_processors (NPROC_ALL)); | |
2091 | } | |
2092 | #undef FUNC_NAME | |
2093 | ||
2094 | SCM_DEFINE (scm_current_processor_count, "current-processor-count", 0, 0, 0, | |
2095 | (void), | |
2096 | "Like @code{total-processor-count}, but return the number of\n" | |
2097 | "processors available to the current process. See\n" | |
2098 | "@code{setaffinity} and @code{getaffinity} for more\n" | |
2099 | "information.\n") | |
2100 | #define FUNC_NAME s_scm_current_processor_count | |
2101 | { | |
2102 | return scm_from_ulong (num_processors (NPROC_CURRENT)); | |
2103 | } | |
2104 | #undef FUNC_NAME | |
2105 | ||
2106 | ||
2107 | \f | |
2108 | ||
9de87eea | 2109 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
2110 | static int threads_initialized_p = 0; |
2111 | ||
9bc4701c | 2112 | |
a4d106c7 MV |
2113 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2114 | */ | |
d1138028 | 2115 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 2116 | |
661ae7ab | 2117 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2118 | |
9bc4701c | 2119 | void |
661ae7ab | 2120 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2121 | { |
a4d106c7 | 2122 | if (scm_is_false (mutex)) |
661ae7ab MV |
2123 | mutex = dynwind_critical_section_mutex; |
2124 | scm_dynwind_lock_mutex (mutex); | |
2125 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2126 | } |
2127 | ||
2128 | /*** Initialization */ | |
2129 | ||
9de87eea MV |
2130 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2131 | ||
d1138028 MV |
2132 | #if SCM_USE_PTHREAD_THREADS |
2133 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2134 | #endif | |
2135 | ||
9de87eea | 2136 | void |
12c1d861 | 2137 | scm_threads_prehistory (void *base) |
9de87eea | 2138 | { |
d1138028 MV |
2139 | #if SCM_USE_PTHREAD_THREADS |
2140 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2141 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2142 | PTHREAD_MUTEX_RECURSIVE); | |
2143 | #endif | |
2144 | ||
2145 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2146 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2147 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2148 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2149 | |
12c1d861 | 2150 | guilify_self_1 ((struct GC_stack_base *) base); |
9bc4701c MD |
2151 | } |
2152 | ||
d823b11b MV |
2153 | scm_t_bits scm_tc16_thread; |
2154 | scm_t_bits scm_tc16_mutex; | |
2155 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2156 | |
7bfd3b9e | 2157 | void |
9de87eea | 2158 | scm_init_threads () |
7bfd3b9e | 2159 | { |
9de87eea | 2160 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2161 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2162 | |
9de87eea | 2163 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2164 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2165 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2166 | |
9de87eea MV |
2167 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2168 | sizeof (fat_cond)); | |
9de87eea | 2169 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2170 | |
9de87eea MV |
2171 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2172 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2173 | threads_initialized_p = 1; |
a4d106c7 | 2174 | |
f39448c5 | 2175 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2176 | } |
89e00824 | 2177 | |
5f05c406 | 2178 | void |
9de87eea | 2179 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2180 | { |
9de87eea | 2181 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2182 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2183 | } |
2184 | ||
d823b11b | 2185 | void |
9de87eea | 2186 | scm_init_thread_procs () |
d823b11b | 2187 | { |
9de87eea | 2188 | #include "libguile/threads.x" |
d823b11b MV |
2189 | } |
2190 | ||
3c13664e LC |
2191 | \f |
2192 | /* IA64-specific things. */ | |
2193 | ||
2194 | #ifdef __ia64__ | |
2195 | # ifdef __hpux | |
2196 | # include <sys/param.h> | |
2197 | # include <sys/pstat.h> | |
2198 | void * | |
2199 | scm_ia64_register_backing_store_base (void) | |
2200 | { | |
2201 | struct pst_vm_status vm_status; | |
2202 | int i = 0; | |
2203 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2204 | if (vm_status.pst_type == PS_RSESTACK) | |
2205 | return (void *) vm_status.pst_vaddr; | |
2206 | abort (); | |
2207 | } | |
2208 | void * | |
2209 | scm_ia64_ar_bsp (const void *ctx) | |
2210 | { | |
2211 | uint64_t bsp; | |
2212 | __uc_get_ar_bsp (ctx, &bsp); | |
2213 | return (void *) bsp; | |
2214 | } | |
2215 | # endif /* hpux */ | |
2216 | # ifdef linux | |
2217 | # include <ucontext.h> | |
2218 | void * | |
2219 | scm_ia64_register_backing_store_base (void) | |
2220 | { | |
2221 | extern void *__libc_ia64_register_backing_store_base; | |
2222 | return __libc_ia64_register_backing_store_base; | |
2223 | } | |
2224 | void * | |
2225 | scm_ia64_ar_bsp (const void *opaque) | |
2226 | { | |
2227 | const ucontext_t *ctx = opaque; | |
2228 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2229 | } | |
2230 | # endif /* linux */ | |
ba20d262 AW |
2231 | # ifdef __FreeBSD__ |
2232 | # include <ucontext.h> | |
2233 | void * | |
2234 | scm_ia64_register_backing_store_base (void) | |
2235 | { | |
2236 | return (void *)0x8000000000000000; | |
2237 | } | |
2238 | void * | |
2239 | scm_ia64_ar_bsp (const void *opaque) | |
2240 | { | |
2241 | const ucontext_t *ctx = opaque; | |
2242 | return (void *)(ctx->uc_mcontext.mc_special.bspstore | |
2243 | + ctx->uc_mcontext.mc_special.ndirty); | |
2244 | } | |
2245 | # endif /* __FreeBSD__ */ | |
3c13664e LC |
2246 | #endif /* __ia64__ */ |
2247 | ||
2248 | ||
89e00824 ML |
2249 | /* |
2250 | Local Variables: | |
2251 | c-file-style: "gnu" | |
2252 | End: | |
2253 | */ |