Commit | Line | Data |
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cde24ce1 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
74926120 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
7bfd3b9e | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
7bfd3b9e | 20 | \f |
dbb605f5 LC |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
7bfd3b9e | 24 | |
1c44468d | 25 | #include "libguile/bdw-gc.h" |
1810dc4e RB |
26 | #include "libguile/_scm.h" |
27 | ||
fcc5d734 | 28 | #if HAVE_UNISTD_H |
d823b11b | 29 | #include <unistd.h> |
fcc5d734 | 30 | #endif |
d823b11b | 31 | #include <stdio.h> |
8ab3d8a0 KR |
32 | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
35 | #endif | |
36 | ||
fcc5d734 | 37 | #if HAVE_SYS_TIME_H |
d823b11b | 38 | #include <sys/time.h> |
fcc5d734 | 39 | #endif |
5f05c406 | 40 | |
f57fdf07 LC |
41 | #include <assert.h> |
42 | ||
d823b11b MV |
43 | #include "libguile/validate.h" |
44 | #include "libguile/root.h" | |
45 | #include "libguile/eval.h" | |
46 | #include "libguile/async.h" | |
47 | #include "libguile/ports.h" | |
48 | #include "libguile/threads.h" | |
a0599745 | 49 | #include "libguile/dynwind.h" |
d823b11b | 50 | #include "libguile/iselect.h" |
9de87eea MV |
51 | #include "libguile/fluids.h" |
52 | #include "libguile/continuations.h" | |
2b829bbb | 53 | #include "libguile/gc.h" |
9de87eea | 54 | #include "libguile/init.h" |
2e77f720 | 55 | #include "libguile/scmsigs.h" |
6180e336 | 56 | #include "libguile/strings.h" |
a0faf7dd | 57 | #include "libguile/weaks.h" |
7bfd3b9e | 58 | |
ecc9f40f MV |
59 | #ifdef __MINGW32__ |
60 | #ifndef ETIMEDOUT | |
61 | # define ETIMEDOUT WSAETIMEDOUT | |
62 | #endif | |
63 | # include <fcntl.h> | |
64 | # include <process.h> | |
65 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
66 | #endif /* __MINGW32__ */ | |
67 | ||
634aa8de LC |
68 | #include <full-read.h> |
69 | ||
cde24ce1 AW |
70 | |
71 | \f | |
72 | ||
73 | /* First some libgc shims. */ | |
74 | ||
75 | /* Make sure GC_fn_type is defined; it is missing from the public | |
76 | headers of GC 7.1 and earlier. */ | |
77 | #ifndef HAVE_GC_FN_TYPE | |
78 | typedef void * (* GC_fn_type) (void *); | |
79 | #endif | |
80 | ||
81 | ||
5f0d2951 AW |
82 | #ifndef GC_SUCCESS |
83 | #define GC_SUCCESS 0 | |
84 | #endif | |
85 | ||
86 | #ifndef GC_UNIMPLEMENTED | |
87 | #define GC_UNIMPLEMENTED 3 | |
88 | #endif | |
89 | ||
90 | /* Likewise struct GC_stack_base is missing before 7.1. */ | |
91 | #ifndef HAVE_GC_STACK_BASE | |
12c1d861 AW |
92 | struct GC_stack_base { |
93 | void * mem_base; /* Base of memory stack. */ | |
94 | #ifdef __ia64__ | |
95 | void * reg_base; /* Base of separate register stack. */ | |
96 | #endif | |
97 | }; | |
5f0d2951 AW |
98 | |
99 | static int | |
100 | GC_register_my_thread (struct GC_stack_base *) | |
101 | { | |
102 | return GC_UNIMPLEMENTED; | |
103 | } | |
104 | ||
105 | static void | |
106 | GC_unregister_my_thread () | |
107 | { | |
108 | } | |
109 | ||
12c1d861 AW |
110 | #if !SCM_USE_PTHREAD_THREADS |
111 | /* No threads; we can just use GC_stackbottom. */ | |
5f0d2951 | 112 | static void * |
12c1d861 AW |
113 | get_thread_stack_base () |
114 | { | |
115 | return GC_stackbottom; | |
116 | } | |
117 | ||
118 | #elif defined HAVE_PTHREAD_ATTR_GETSTACK && defined HAVE_PTHREAD_GETATTR_NP \ | |
119 | && defined PTHREAD_ATTR_GETSTACK_WORKS | |
120 | /* This method for GNU/Linux and perhaps some other systems. | |
121 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
122 | available on them. */ | |
123 | static void * | |
124 | get_thread_stack_base () | |
125 | { | |
126 | pthread_attr_t attr; | |
127 | void *start, *end; | |
128 | size_t size; | |
129 | ||
130 | pthread_getattr_np (pthread_self (), &attr); | |
131 | pthread_attr_getstack (&attr, &start, &size); | |
132 | end = (char *)start + size; | |
133 | ||
134 | #if SCM_STACK_GROWS_UP | |
135 | return start; | |
136 | #else | |
137 | return end; | |
138 | #endif | |
139 | } | |
140 | ||
141 | #elif defined HAVE_PTHREAD_GET_STACKADDR_NP | |
142 | /* This method for MacOS X. | |
143 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
144 | but as of 2006 there's nothing obvious at apple.com. */ | |
145 | static void * | |
146 | get_thread_stack_base () | |
147 | { | |
148 | return pthread_get_stackaddr_np (pthread_self ()); | |
149 | } | |
150 | ||
151 | #else | |
152 | #error Threads enabled with old BDW-GC, but missing get_thread_stack_base impl. Please upgrade to libgc >= 7.1. | |
153 | #endif | |
154 | ||
155 | static int | |
156 | GC_get_stack_base (struct GC_stack_base *) | |
5f0d2951 | 157 | { |
12c1d861 AW |
158 | stack_base->mem_base = get_thread_stack_base (); |
159 | #ifdef __ia64__ | |
160 | /* Calculate and store off the base of this thread's register | |
161 | backing store (RBS). Unfortunately our implementation(s) of | |
162 | scm_ia64_register_backing_store_base are only reliable for the | |
163 | main thread. For other threads, therefore, find out the current | |
164 | top of the RBS, and use that as a maximum. */ | |
165 | stack_base->reg_base = scm_ia64_register_backing_store_base (); | |
166 | { | |
167 | ucontext_t ctx; | |
168 | void *bsp; | |
169 | getcontext (&ctx); | |
170 | bsp = scm_ia64_ar_bsp (&ctx); | |
171 | if (stack_base->reg_base > bsp) | |
172 | stack_base->reg_base = bsp; | |
173 | } | |
174 | #endif | |
175 | return GC_SUCCESS; | |
5f0d2951 | 176 | } |
12c1d861 AW |
177 | |
178 | static void * | |
179 | GC_call_with_stack_base(void * (*fn) (struct GC_stack_base*, void*), void *arg) | |
180 | { | |
181 | struct GC_stack_base stack_base; | |
182 | ||
183 | stack_base.mem_base = (void*)&stack_base; | |
184 | #ifdef __ia64__ | |
185 | /* FIXME: Untested. */ | |
186 | { | |
187 | ucontext_t ctx; | |
188 | getcontext (&ctx); | |
189 | stack_base.reg_base = scm_ia64_ar_bsp (&ctx); | |
190 | } | |
5f0d2951 AW |
191 | #endif |
192 | ||
12c1d861 AW |
193 | return fn (&stack_base, arg); |
194 | } | |
195 | #endif /* HAVE_GC_STACK_BASE */ | |
196 | ||
5f0d2951 | 197 | |
cde24ce1 AW |
198 | /* Now define with_gc_active and with_gc_inactive. */ |
199 | ||
200 | #if (defined(HAVE_GC_DO_BLOCKING) && defined (HAVE_DECL_GC_DO_BLOCKING) && defined (HAVE_GC_CALL_WITH_GC_ACTIVE)) | |
201 | ||
202 | /* We have a sufficiently new libgc (7.2 or newer). */ | |
203 | ||
204 | static void* | |
205 | with_gc_inactive (GC_fn_type func, void *data) | |
206 | { | |
207 | return GC_do_blocking (func, data); | |
208 | } | |
209 | ||
210 | static void* | |
211 | with_gc_active (GC_fn_type func, void *data) | |
212 | { | |
213 | return GC_call_with_gc_active (func, data); | |
214 | } | |
215 | ||
216 | #else | |
217 | ||
218 | /* libgc not new enough, so never actually deactivate GC. | |
219 | ||
220 | Note that though GC 7.1 does have a GC_do_blocking, it doesn't have | |
221 | GC_call_with_gc_active. */ | |
222 | ||
223 | static void* | |
224 | with_gc_inactive (GC_fn_type func, void *data) | |
225 | { | |
226 | return func (data); | |
227 | } | |
228 | ||
229 | static void* | |
230 | with_gc_active (GC_fn_type func, void *data) | |
231 | { | |
232 | return func (data); | |
233 | } | |
234 | ||
235 | #endif /* HAVE_GC_DO_BLOCKING */ | |
236 | ||
237 | ||
634aa8de | 238 | \f |
6180e336 NJ |
239 | static void |
240 | to_timespec (SCM t, scm_t_timespec *waittime) | |
241 | { | |
242 | if (scm_is_pair (t)) | |
243 | { | |
244 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
245 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
246 | } | |
247 | else | |
248 | { | |
249 | double time = scm_to_double (t); | |
250 | double sec = scm_c_truncate (time); | |
251 | ||
252 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 253 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
254 | } |
255 | } | |
256 | ||
c058db8a | 257 | \f |
d823b11b | 258 | /*** Queues */ |
7bfd3b9e | 259 | |
c058db8a LC |
260 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
261 | the risk of false references leading to unbounded retained space as | |
262 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
263 | H.J. Boehm, 2001. */ | |
264 | ||
9de87eea MV |
265 | /* Make an empty queue data structure. |
266 | */ | |
d823b11b MV |
267 | static SCM |
268 | make_queue () | |
269 | { | |
270 | return scm_cons (SCM_EOL, SCM_EOL); | |
271 | } | |
7bfd3b9e | 272 | |
9de87eea MV |
273 | /* Put T at the back of Q and return a handle that can be used with |
274 | remqueue to remove T from Q again. | |
275 | */ | |
d823b11b MV |
276 | static SCM |
277 | enqueue (SCM q, SCM t) | |
278 | { | |
279 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 280 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 281 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
282 | SCM_SETCDR (q, c); |
283 | else | |
284 | SCM_SETCDR (SCM_CAR (q), c); | |
285 | SCM_SETCAR (q, c); | |
d2a51087 | 286 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
287 | return c; |
288 | } | |
7bfd3b9e | 289 | |
9de87eea MV |
290 | /* Remove the element that the handle C refers to from the queue Q. C |
291 | must have been returned from a call to enqueue. The return value | |
292 | is zero when the element referred to by C has already been removed. | |
293 | Otherwise, 1 is returned. | |
294 | */ | |
295 | static int | |
d823b11b MV |
296 | remqueue (SCM q, SCM c) |
297 | { | |
298 | SCM p, prev = q; | |
d2a51087 | 299 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 300 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 301 | { |
bc36d050 | 302 | if (scm_is_eq (p, c)) |
d823b11b | 303 | { |
bc36d050 | 304 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
305 | SCM_SETCAR (q, SCM_CDR (c)); |
306 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
307 | |
308 | /* GC-robust */ | |
309 | SCM_SETCDR (c, SCM_EOL); | |
310 | ||
d2a51087 | 311 | SCM_CRITICAL_SECTION_END; |
9de87eea | 312 | return 1; |
d823b11b MV |
313 | } |
314 | prev = p; | |
315 | } | |
d2a51087 | 316 | SCM_CRITICAL_SECTION_END; |
9de87eea | 317 | return 0; |
d823b11b MV |
318 | } |
319 | ||
9de87eea MV |
320 | /* Remove the front-most element from the queue Q and return it. |
321 | Return SCM_BOOL_F when Q is empty. | |
322 | */ | |
d823b11b MV |
323 | static SCM |
324 | dequeue (SCM q) | |
325 | { | |
d2a51087 NJ |
326 | SCM c; |
327 | SCM_CRITICAL_SECTION_START; | |
328 | c = SCM_CDR (q); | |
d2e53ed6 | 329 | if (scm_is_null (c)) |
d2a51087 NJ |
330 | { |
331 | SCM_CRITICAL_SECTION_END; | |
332 | return SCM_BOOL_F; | |
333 | } | |
d823b11b MV |
334 | else |
335 | { | |
336 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 337 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 338 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 339 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
340 | |
341 | /* GC-robust */ | |
342 | SCM_SETCDR (c, SCM_EOL); | |
343 | ||
d823b11b MV |
344 | return SCM_CAR (c); |
345 | } | |
346 | } | |
7bfd3b9e | 347 | |
9de87eea | 348 | /*** Thread smob routines */ |
76da80e7 | 349 | |
d823b11b MV |
350 | |
351 | static int | |
352 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
353 | { | |
23d72566 KR |
354 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
355 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
356 | the struct case, hence we go via a union, and extract according to the | |
357 | size of pthread_t. */ | |
358 | union { | |
359 | scm_i_pthread_t p; | |
360 | unsigned short us; | |
361 | unsigned int ui; | |
362 | unsigned long ul; | |
363 | scm_t_uintmax um; | |
364 | } u; | |
9de87eea | 365 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
366 | scm_i_pthread_t p = t->pthread; |
367 | scm_t_uintmax id; | |
368 | u.p = p; | |
369 | if (sizeof (p) == sizeof (unsigned short)) | |
370 | id = u.us; | |
371 | else if (sizeof (p) == sizeof (unsigned int)) | |
372 | id = u.ui; | |
373 | else if (sizeof (p) == sizeof (unsigned long)) | |
374 | id = u.ul; | |
375 | else | |
376 | id = u.um; | |
377 | ||
d823b11b | 378 | scm_puts ("#<thread ", port); |
23d72566 | 379 | scm_uintprint (id, 10, port); |
1b92fb6b | 380 | scm_puts (" (", port); |
0345e278 | 381 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 382 | scm_puts (")>", port); |
d823b11b MV |
383 | return 1; |
384 | } | |
385 | ||
706846f6 | 386 | \f |
9de87eea | 387 | /*** Blocking on queues. */ |
f7eca35d | 388 | |
9de87eea MV |
389 | /* See also scm_i_queue_async_cell for how such a block is |
390 | interrputed. | |
391 | */ | |
d823b11b | 392 | |
9de87eea MV |
393 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
394 | be woken up by a call to 'unblock_from_queue', or to be | |
395 | interrupted. Upon return of this function, the current thread is | |
396 | no longer on QUEUE, even when the sleep has been interrupted. | |
397 | ||
d2a51087 | 398 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
399 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
400 | ||
401 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
402 | as MUTEX is needed. | |
403 | ||
404 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
405 | ||
406 | The return value of block_self is an errno value. It will be zero | |
407 | when the sleep has been successfully completed by a call to | |
408 | unblock_from_queue, EINTR when it has been interrupted by the | |
409 | delivery of a system async, and ETIMEDOUT when the timeout has | |
410 | expired. | |
411 | ||
412 | The system asyncs themselves are not executed by block_self. | |
413 | */ | |
414 | static int | |
415 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
416 | const scm_t_timespec *waittime) | |
76da80e7 | 417 | { |
9de87eea MV |
418 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
419 | SCM q_handle; | |
420 | int err; | |
421 | ||
422 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
423 | err = EINTR; | |
424 | else | |
425 | { | |
426 | t->block_asyncs++; | |
427 | q_handle = enqueue (queue, t->handle); | |
428 | if (waittime == NULL) | |
429 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
430 | else | |
431 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
432 | ||
433 | /* When we are still on QUEUE, we have been interrupted. We | |
434 | report this only when no other error (such as a timeout) has | |
435 | happened above. | |
436 | */ | |
437 | if (remqueue (queue, q_handle) && err == 0) | |
438 | err = EINTR; | |
439 | t->block_asyncs--; | |
440 | scm_i_reset_sleep (t); | |
441 | } | |
442 | ||
443 | return err; | |
76da80e7 | 444 | } |
9de87eea | 445 | |
d2a51087 NJ |
446 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
447 | returned, or #f if the queue was empty. | |
9de87eea MV |
448 | */ |
449 | static SCM | |
450 | unblock_from_queue (SCM queue) | |
451 | { | |
452 | SCM thread = dequeue (queue); | |
453 | if (scm_is_true (thread)) | |
454 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
455 | return thread; | |
456 | } | |
457 | ||
45f15cac | 458 | \f |
9de87eea MV |
459 | /* Getting into and out of guile mode. |
460 | */ | |
461 | ||
f60a7648 AW |
462 | /* Key used to attach a cleanup handler to a given thread. Also, if |
463 | thread-local storage is unavailable, this key is used to retrieve the | |
464 | current thread with `pthread_getspecific ()'. */ | |
465 | scm_i_pthread_key_t scm_i_thread_key; | |
466 | ||
467 | ||
705edb95 LC |
468 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
469 | ||
470 | /* When thread-local storage (TLS) is available, a pointer to the | |
471 | current-thread object is kept in TLS. Note that storing the thread-object | |
472 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
473 | possible since thread objects may live longer than the actual thread they | |
474 | represent. */ | |
475 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
476 | ||
f60a7648 | 477 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 478 | |
d823b11b | 479 | |
9de87eea MV |
480 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
481 | static scm_i_thread *all_threads = NULL; | |
482 | static int thread_count; | |
483 | ||
484 | static SCM scm_i_default_dynamic_state; | |
485 | ||
486 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 487 | */ |
9de87eea | 488 | static void |
12c1d861 | 489 | guilify_self_1 (struct GC_stack_base *base) |
d823b11b | 490 | { |
7f22442b AW |
491 | scm_i_thread t; |
492 | ||
493 | /* We must arrange for SCM_I_CURRENT_THREAD to point to a valid value | |
494 | before allocating anything in this thread, because allocation could | |
495 | cause GC to run, and GC could cause finalizers, which could invoke | |
496 | Scheme functions, which need the current thread to be set. */ | |
497 | ||
498 | t.pthread = scm_i_pthread_self (); | |
499 | t.handle = SCM_BOOL_F; | |
500 | t.result = SCM_BOOL_F; | |
501 | t.cleanup_handler = SCM_BOOL_F; | |
502 | t.mutexes = SCM_EOL; | |
503 | t.held_mutex = NULL; | |
504 | t.join_queue = SCM_EOL; | |
505 | t.dynamic_state = SCM_BOOL_F; | |
506 | t.dynwinds = SCM_EOL; | |
507 | t.active_asyncs = SCM_EOL; | |
508 | t.block_asyncs = 1; | |
509 | t.pending_asyncs = 1; | |
510 | t.critical_section_level = 0; | |
511 | t.base = base->mem_base; | |
346e4402 | 512 | #ifdef __ia64__ |
7f22442b | 513 | t.register_backing_store_base = base->reg-base; |
346e4402 | 514 | #endif |
7f22442b AW |
515 | t.continuation_root = SCM_EOL; |
516 | t.continuation_base = t.base; | |
517 | scm_i_pthread_cond_init (&t.sleep_cond, NULL); | |
518 | t.sleep_mutex = NULL; | |
519 | t.sleep_object = SCM_BOOL_F; | |
520 | t.sleep_fd = -1; | |
521 | ||
522 | if (pipe (t.sleep_pipe) != 0) | |
634aa8de LC |
523 | /* FIXME: Error conditions during the initialization phase are handled |
524 | gracelessly since public functions such as `scm_init_guile ()' | |
525 | currently have type `void'. */ | |
526 | abort (); | |
527 | ||
7f22442b AW |
528 | scm_i_pthread_mutex_init (&t.admin_mutex, NULL); |
529 | t.current_mark_stack_ptr = NULL; | |
530 | t.current_mark_stack_limit = NULL; | |
531 | t.canceled = 0; | |
532 | t.exited = 0; | |
533 | t.guile_mode = 0; | |
9de87eea | 534 | |
7f22442b AW |
535 | /* The switcheroo. */ |
536 | { | |
537 | scm_i_thread *t_ptr = &t; | |
538 | ||
539 | GC_disable (); | |
540 | t_ptr = GC_malloc (sizeof (scm_i_thread)); | |
541 | memcpy (t_ptr, &t, sizeof t); | |
542 | ||
543 | scm_i_pthread_setspecific (scm_i_thread_key, t_ptr); | |
f60a7648 AW |
544 | |
545 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
7f22442b AW |
546 | /* Cache the current thread in TLS for faster lookup. */ |
547 | scm_i_current_thread = t_ptr; | |
f60a7648 | 548 | #endif |
9de87eea | 549 | |
7f22442b AW |
550 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
551 | t_ptr->next_thread = all_threads; | |
552 | all_threads = t_ptr; | |
553 | thread_count++; | |
554 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
555 | ||
556 | GC_enable (); | |
557 | } | |
d823b11b MV |
558 | } |
559 | ||
9de87eea | 560 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 561 | */ |
9de87eea MV |
562 | static void |
563 | guilify_self_2 (SCM parent) | |
d823b11b | 564 | { |
9de87eea MV |
565 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
566 | ||
72e6b608 LC |
567 | t->guile_mode = 1; |
568 | ||
9de87eea | 569 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 570 | |
9de87eea MV |
571 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
572 | t->continuation_base = t->base; | |
2bbe1533 | 573 | t->vm = SCM_BOOL_F; |
9de87eea MV |
574 | |
575 | if (scm_is_true (parent)) | |
576 | t->dynamic_state = scm_make_dynamic_state (parent); | |
577 | else | |
578 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
579 | ||
580 | t->join_queue = make_queue (); | |
581 | t->block_asyncs = 0; | |
d823b11b MV |
582 | } |
583 | ||
6180e336 NJ |
584 | \f |
585 | /*** Fat mutexes */ | |
586 | ||
587 | /* We implement our own mutex type since we want them to be 'fair', we | |
588 | want to do fancy things while waiting for them (like running | |
589 | asyncs) and we might want to add things that are nice for | |
590 | debugging. | |
591 | */ | |
592 | ||
593 | typedef struct { | |
594 | scm_i_pthread_mutex_t lock; | |
595 | SCM owner; | |
adc085f1 | 596 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 597 | |
adc085f1 | 598 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
599 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
600 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
601 | owned by the current thread? */ | |
602 | ||
603 | SCM waiting; /* the threads waiting for this mutex. */ | |
604 | } fat_mutex; | |
605 | ||
606 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
607 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
608 | ||
9de87eea | 609 | /* Perform thread tear-down, in guile mode. |
d823b11b | 610 | */ |
9de87eea MV |
611 | static void * |
612 | do_thread_exit (void *v) | |
613 | { | |
2e77f720 LC |
614 | scm_i_thread *t = (scm_i_thread *) v; |
615 | ||
616 | if (!scm_is_false (t->cleanup_handler)) | |
617 | { | |
618 | SCM ptr = t->cleanup_handler; | |
619 | ||
620 | t->cleanup_handler = SCM_BOOL_F; | |
621 | t->result = scm_internal_catch (SCM_BOOL_T, | |
622 | (scm_t_catch_body) scm_call_0, ptr, | |
623 | scm_handle_by_message_noexit, NULL); | |
624 | } | |
9de87eea | 625 | |
86a597f8 | 626 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
627 | |
628 | t->exited = 1; | |
0c97d7dd MV |
629 | close (t->sleep_pipe[0]); |
630 | close (t->sleep_pipe[1]); | |
9de87eea MV |
631 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
632 | ; | |
9de87eea | 633 | |
74926120 | 634 | while (!scm_is_null (t->mutexes)) |
6180e336 | 635 | { |
a0faf7dd | 636 | SCM mutex = SCM_WEAK_PAIR_CAR (t->mutexes); |
74926120 | 637 | |
a0faf7dd LC |
638 | if (!SCM_UNBNDP (mutex)) |
639 | { | |
640 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
641 | ||
642 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 LC |
643 | |
644 | /* Since MUTEX is in `t->mutexes', T must be its owner. */ | |
645 | assert (scm_is_eq (m->owner, t->handle)); | |
646 | ||
a0faf7dd | 647 | unblock_from_queue (m->waiting); |
f57fdf07 | 648 | |
a0faf7dd LC |
649 | scm_i_pthread_mutex_unlock (&m->lock); |
650 | } | |
6180e336 | 651 | |
a0faf7dd | 652 | t->mutexes = SCM_WEAK_PAIR_CDR (t->mutexes); |
6180e336 NJ |
653 | } |
654 | ||
86a597f8 | 655 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 656 | |
9de87eea MV |
657 | return NULL; |
658 | } | |
659 | ||
f60a7648 AW |
660 | static void * |
661 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
662 | { | |
7f22442b AW |
663 | /* Won't hurt if we are already registered. */ |
664 | GC_register_my_thread (sb); | |
f60a7648 | 665 | |
7f22442b | 666 | return scm_with_guile (do_thread_exit, v); |
f60a7648 AW |
667 | } |
668 | ||
d823b11b | 669 | static void |
9de87eea | 670 | on_thread_exit (void *v) |
d823b11b | 671 | { |
29776e85 | 672 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 673 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 674 | |
d2a51087 NJ |
675 | /* If this thread was cancelled while doing a cond wait, it will |
676 | still have a mutex locked, so we unlock it here. */ | |
677 | if (t->held_mutex) | |
678 | { | |
679 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
680 | t->held_mutex = NULL; | |
681 | } | |
682 | ||
f60a7648 AW |
683 | /* Reinstate the current thread for purposes of scm_with_guile |
684 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
685 | case but it doesn't hurt to be consistent. */ | |
686 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 687 | |
2e77f720 LC |
688 | /* Ensure the signal handling thread has been launched, because we might be |
689 | shutting it down. */ | |
690 | scm_i_ensure_signal_delivery_thread (); | |
691 | ||
7f22442b AW |
692 | /* Scheme-level thread finalizers and other cleanup needs to happen in |
693 | guile mode. */ | |
694 | GC_call_with_stack_base (do_thread_exit_trampoline, t); | |
0c97d7dd MV |
695 | |
696 | /* Removing ourself from the list of all threads needs to happen in | |
697 | non-guile mode since all SCM values on our stack become | |
29776e85 | 698 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
699 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
700 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
701 | if (*tp == t) | |
702 | { | |
703 | *tp = t->next_thread; | |
c058db8a LC |
704 | |
705 | /* GC-robust */ | |
706 | t->next_thread = NULL; | |
707 | ||
0c97d7dd MV |
708 | break; |
709 | } | |
710 | thread_count--; | |
2e77f720 LC |
711 | |
712 | /* If there's only one other thread, it could be the signal delivery | |
713 | thread, so we need to notify it to shut down by closing its read pipe. | |
714 | If it's not the signal delivery thread, then closing the read pipe isn't | |
715 | going to hurt. */ | |
716 | if (thread_count <= 1) | |
717 | scm_i_close_signal_pipe (); | |
718 | ||
0c97d7dd MV |
719 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
720 | ||
f60a7648 | 721 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
7f22442b AW |
722 | |
723 | GC_unregister_my_thread (); | |
d823b11b MV |
724 | } |
725 | ||
9de87eea | 726 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 727 | |
9de87eea MV |
728 | static void |
729 | init_thread_key (void) | |
730 | { | |
f60a7648 | 731 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 732 | } |
d823b11b | 733 | |
cde24ce1 AW |
734 | /* Perform any initializations necessary to make the current thread |
735 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
736 | if necessary. | |
a54a94b3 | 737 | |
9de87eea MV |
738 | BASE is the stack base to use with GC. |
739 | ||
740 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
741 | which case the default dynamic state is used. | |
742 | ||
cde24ce1 | 743 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 744 | return 1. |
cde24ce1 AW |
745 | |
746 | Note that it could be the case that the thread was known | |
747 | to Guile, but not in guile mode (because we are within a | |
748 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
749 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
750 | |
751 | static int | |
12c1d861 | 752 | scm_i_init_thread_for_guile (struct GC_stack_base *base, SCM parent) |
d823b11b | 753 | { |
9de87eea MV |
754 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
755 | ||
cde24ce1 AW |
756 | if (SCM_I_CURRENT_THREAD) |
757 | { | |
758 | /* Thread is already known to Guile. | |
759 | */ | |
760 | return 0; | |
761 | } | |
762 | else | |
9de87eea MV |
763 | { |
764 | /* This thread has not been guilified yet. | |
765 | */ | |
766 | ||
767 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
768 | if (scm_initialized_p == 0) | |
769 | { | |
770 | /* First thread ever to enter Guile. Run the full | |
771 | initialization. | |
772 | */ | |
773 | scm_i_init_guile (base); | |
12c1d861 AW |
774 | |
775 | /* Allow other threads to come in later. */ | |
776 | GC_allow_register_threads (); | |
777 | ||
9de87eea MV |
778 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); |
779 | } | |
780 | else | |
781 | { | |
782 | /* Guile is already initialized, but this thread enters it for | |
783 | the first time. Only initialize this thread. | |
784 | */ | |
785 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
12c1d861 AW |
786 | |
787 | /* Register this thread with libgc. */ | |
788 | GC_register_my_thread (base); | |
789 | ||
9de87eea MV |
790 | guilify_self_1 (base); |
791 | guilify_self_2 (parent); | |
792 | } | |
793 | return 1; | |
794 | } | |
d823b11b MV |
795 | } |
796 | ||
12c1d861 AW |
797 | void |
798 | scm_init_guile () | |
d823b11b | 799 | { |
12c1d861 AW |
800 | struct GC_stack_base stack_base; |
801 | ||
802 | if (GC_get_stack_base (&stack_base) == GC_SUCCESS) | |
803 | scm_i_init_thread_for_guile (&stack_base, | |
804 | scm_i_default_dynamic_state); | |
9de87eea MV |
805 | else |
806 | { | |
12c1d861 AW |
807 | fprintf (stderr, "Failed to get stack base for current thread.\n"); |
808 | exit (1); | |
9de87eea | 809 | } |
a54a94b3 MV |
810 | } |
811 | ||
70eca635 | 812 | SCM_UNUSED static void |
2e77f720 LC |
813 | scm_leave_guile_cleanup (void *x) |
814 | { | |
47b6e9bd | 815 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
816 | } |
817 | ||
12c1d861 | 818 | struct with_guile_args |
cde24ce1 AW |
819 | { |
820 | GC_fn_type func; | |
821 | void *data; | |
12c1d861 | 822 | SCM parent; |
cde24ce1 AW |
823 | }; |
824 | ||
825 | static void * | |
826 | with_guile_trampoline (void *data) | |
827 | { | |
12c1d861 | 828 | struct with_guile_args *args = data; |
cde24ce1 AW |
829 | |
830 | return scm_c_with_continuation_barrier (args->func, args->data); | |
831 | } | |
832 | ||
12c1d861 AW |
833 | static void * |
834 | with_guile_and_parent (struct GC_stack_base *base, void *data) | |
9de87eea MV |
835 | { |
836 | void *res; | |
cde24ce1 AW |
837 | int new_thread; |
838 | scm_i_thread *t; | |
12c1d861 | 839 | struct with_guile_args *args = data; |
2e77f720 | 840 | |
12c1d861 | 841 | new_thread = scm_i_init_thread_for_guile (base, args->parent); |
cde24ce1 AW |
842 | t = SCM_I_CURRENT_THREAD; |
843 | if (new_thread) | |
2e77f720 | 844 | { |
cde24ce1 AW |
845 | /* We are in Guile mode. */ |
846 | assert (t->guile_mode); | |
847 | ||
12c1d861 | 848 | res = scm_c_with_continuation_barrier (args->func, args->data); |
cde24ce1 AW |
849 | |
850 | /* Leave Guile mode. */ | |
851 | t->guile_mode = 0; | |
852 | } | |
853 | else if (t->guile_mode) | |
854 | { | |
855 | /* Already in Guile mode. */ | |
12c1d861 | 856 | res = scm_c_with_continuation_barrier (args->func, args->data); |
2e77f720 | 857 | } |
74926120 | 858 | else |
cde24ce1 | 859 | { |
cde24ce1 AW |
860 | /* We are not in Guile mode, either because we are not within a |
861 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 862 | |
cde24ce1 AW |
863 | This call to scm_with_guile() could happen from anywhere on the |
864 | stack, and in particular lower on the stack than when it was | |
865 | when this thread was first guilified. Thus, `base' must be | |
866 | updated. */ | |
867 | #if SCM_STACK_GROWS_UP | |
12c1d861 AW |
868 | if (SCM_STACK_PTR (base->mem_base) < t->base) |
869 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 870 | #else |
12c1d861 AW |
871 | if (SCM_STACK_PTR (base->mem_base) > t->base) |
872 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 873 | #endif |
72e6b608 | 874 | |
cde24ce1 | 875 | t->guile_mode = 1; |
12c1d861 | 876 | res = with_gc_active (with_guile_trampoline, args); |
cde24ce1 AW |
877 | t->guile_mode = 0; |
878 | } | |
879 | return res; | |
72e6b608 | 880 | } |
3d1af79f | 881 | |
12c1d861 AW |
882 | static void * |
883 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) | |
884 | { | |
885 | struct with_guile_args args; | |
886 | ||
887 | args.func = func; | |
888 | args.data = data; | |
889 | args.parent = parent; | |
890 | ||
891 | return GC_call_with_stack_base (with_guile_and_parent, &args); | |
892 | } | |
893 | ||
894 | void * | |
895 | scm_with_guile (void *(*func)(void *), void *data) | |
896 | { | |
897 | return scm_i_with_guile_and_parent (func, data, | |
898 | scm_i_default_dynamic_state); | |
899 | } | |
900 | ||
9de87eea MV |
901 | void * |
902 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 903 | { |
72e6b608 | 904 | void *result; |
cde24ce1 | 905 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 906 | |
cde24ce1 | 907 | if (t->guile_mode) |
72e6b608 | 908 | { |
cde24ce1 AW |
909 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
910 | result = with_gc_inactive (func, data); | |
911 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
72e6b608 LC |
912 | } |
913 | else | |
cde24ce1 | 914 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
915 | result = func (data); |
916 | ||
917 | return result; | |
9de87eea MV |
918 | } |
919 | ||
72e6b608 | 920 | \f |
9de87eea MV |
921 | /*** Thread creation */ |
922 | ||
923 | typedef struct { | |
924 | SCM parent; | |
925 | SCM thunk; | |
926 | SCM handler; | |
76da80e7 | 927 | SCM thread; |
9de87eea MV |
928 | scm_i_pthread_mutex_t mutex; |
929 | scm_i_pthread_cond_t cond; | |
930 | } launch_data; | |
d823b11b | 931 | |
9de87eea MV |
932 | static void * |
933 | really_launch (void *d) | |
934 | { | |
935 | launch_data *data = (launch_data *)d; | |
936 | SCM thunk = data->thunk, handler = data->handler; | |
937 | scm_i_thread *t; | |
d823b11b | 938 | |
9de87eea | 939 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 940 | |
9de87eea MV |
941 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
942 | data->thread = scm_current_thread (); | |
943 | scm_i_pthread_cond_signal (&data->cond); | |
944 | scm_i_pthread_mutex_unlock (&data->mutex); | |
945 | ||
946 | if (SCM_UNBNDP (handler)) | |
947 | t->result = scm_call_0 (thunk); | |
948 | else | |
949 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
950 | ||
951 | return 0; | |
d823b11b MV |
952 | } |
953 | ||
9de87eea MV |
954 | static void * |
955 | launch_thread (void *d) | |
956 | { | |
957 | launch_data *data = (launch_data *)d; | |
958 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
959 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
960 | return NULL; | |
961 | } | |
962 | ||
963 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 964 | (SCM thunk, SCM handler), |
9de87eea MV |
965 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
966 | "returning a new thread object representing the thread. The procedure\n" | |
967 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
968 | "\n" | |
969 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
970 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
971 | "handler. This catch is established inside the continuation barrier.\n" | |
972 | "\n" | |
973 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
974 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
975 | #define FUNC_NAME s_scm_call_with_new_thread |
976 | { | |
9de87eea MV |
977 | launch_data data; |
978 | scm_i_pthread_t id; | |
979 | int err; | |
d823b11b | 980 | |
9de87eea MV |
981 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
982 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
983 | handler, SCM_ARG2, FUNC_NAME); | |
984 | ||
985 | data.parent = scm_current_dynamic_state (); | |
986 | data.thunk = thunk; | |
987 | data.handler = handler; | |
988 | data.thread = SCM_BOOL_F; | |
989 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
990 | scm_i_pthread_cond_init (&data.cond, NULL); | |
991 | ||
992 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
993 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
994 | if (err) | |
995 | { | |
996 | scm_i_pthread_mutex_unlock (&data.mutex); | |
997 | errno = err; | |
998 | scm_syserror (NULL); | |
999 | } | |
1000 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1001 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1002 | |
9de87eea | 1003 | return data.thread; |
d823b11b MV |
1004 | } |
1005 | #undef FUNC_NAME | |
1006 | ||
9de87eea MV |
1007 | typedef struct { |
1008 | SCM parent; | |
1009 | scm_t_catch_body body; | |
1010 | void *body_data; | |
1011 | scm_t_catch_handler handler; | |
1012 | void *handler_data; | |
1013 | SCM thread; | |
1014 | scm_i_pthread_mutex_t mutex; | |
1015 | scm_i_pthread_cond_t cond; | |
1016 | } spawn_data; | |
1017 | ||
1018 | static void * | |
1019 | really_spawn (void *d) | |
1020 | { | |
1021 | spawn_data *data = (spawn_data *)d; | |
1022 | scm_t_catch_body body = data->body; | |
1023 | void *body_data = data->body_data; | |
1024 | scm_t_catch_handler handler = data->handler; | |
1025 | void *handler_data = data->handler_data; | |
1026 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1027 | ||
1028 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1029 | data->thread = scm_current_thread (); | |
1030 | scm_i_pthread_cond_signal (&data->cond); | |
1031 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1032 | ||
1033 | if (handler == NULL) | |
1034 | t->result = body (body_data); | |
1035 | else | |
1036 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1037 | body, body_data, | |
1038 | handler, handler_data); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static void * | |
1044 | spawn_thread (void *d) | |
1045 | { | |
1046 | spawn_data *data = (spawn_data *)d; | |
1047 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1048 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | SCM | |
1053 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1054 | scm_t_catch_handler handler, void *handler_data) | |
1055 | { | |
1056 | spawn_data data; | |
1057 | scm_i_pthread_t id; | |
1058 | int err; | |
1059 | ||
1060 | data.parent = scm_current_dynamic_state (); | |
1061 | data.body = body; | |
1062 | data.body_data = body_data; | |
1063 | data.handler = handler; | |
1064 | data.handler_data = handler_data; | |
1065 | data.thread = SCM_BOOL_F; | |
1066 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1067 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1068 | ||
1069 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1070 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1071 | if (err) | |
1072 | { | |
1073 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1074 | errno = err; | |
1075 | scm_syserror (NULL); | |
1076 | } | |
1077 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1078 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1079 | |
9de87eea MV |
1080 | return data.thread; |
1081 | } | |
1082 | ||
29717c89 MD |
1083 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1084 | (), | |
1085 | "Move the calling thread to the end of the scheduling queue.") | |
1086 | #define FUNC_NAME s_scm_yield | |
1087 | { | |
9de87eea | 1088 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1089 | } |
1090 | #undef FUNC_NAME | |
1091 | ||
2e77f720 LC |
1092 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1093 | (SCM thread), | |
1094 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1095 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1096 | "been signaled to terminate, this function is a no-op.") | |
1097 | #define FUNC_NAME s_scm_cancel_thread | |
1098 | { | |
1099 | scm_i_thread *t = NULL; | |
1100 | ||
1101 | SCM_VALIDATE_THREAD (1, thread); | |
1102 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1103 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1104 | if (!t->canceled) |
1105 | { | |
1106 | t->canceled = 1; | |
86a597f8 | 1107 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1108 | scm_i_pthread_cancel (t->pthread); |
1109 | } | |
1110 | else | |
86a597f8 | 1111 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1112 | |
1113 | return SCM_UNSPECIFIED; | |
1114 | } | |
1115 | #undef FUNC_NAME | |
1116 | ||
1117 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1118 | (SCM thread, SCM proc), | |
1119 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1120 | "This handler will be called when the thread exits.") | |
1121 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1122 | { | |
1123 | scm_i_thread *t; | |
1124 | ||
1125 | SCM_VALIDATE_THREAD (1, thread); | |
1126 | if (!scm_is_false (proc)) | |
1127 | SCM_VALIDATE_THUNK (2, proc); | |
1128 | ||
2e77f720 | 1129 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1130 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1131 | ||
2e77f720 LC |
1132 | if (!(t->exited || t->canceled)) |
1133 | t->cleanup_handler = proc; | |
1134 | ||
86a597f8 | 1135 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1136 | |
1137 | return SCM_UNSPECIFIED; | |
1138 | } | |
1139 | #undef FUNC_NAME | |
1140 | ||
1141 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1142 | (SCM thread), | |
1143 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1144 | #define FUNC_NAME s_scm_thread_cleanup | |
1145 | { | |
1146 | scm_i_thread *t; | |
1147 | SCM ret; | |
1148 | ||
1149 | SCM_VALIDATE_THREAD (1, thread); | |
1150 | ||
2e77f720 | 1151 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1152 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1153 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1154 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1155 | |
1156 | return ret; | |
1157 | } | |
1158 | #undef FUNC_NAME | |
1159 | ||
6180e336 NJ |
1160 | SCM scm_join_thread (SCM thread) |
1161 | { | |
1162 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1163 | } | |
1164 | ||
1165 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1166 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1167 | "Suspend execution of the calling thread until the target @var{thread} " |
1168 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1169 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1170 | { |
9de87eea | 1171 | scm_i_thread *t; |
6180e336 NJ |
1172 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1173 | SCM res = SCM_BOOL_F; | |
1174 | ||
1175 | if (! (SCM_UNBNDP (timeoutval))) | |
1176 | res = timeoutval; | |
d823b11b MV |
1177 | |
1178 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1179 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1180 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1181 | |
9de87eea | 1182 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1183 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1184 | ||
6180e336 NJ |
1185 | if (! SCM_UNBNDP (timeout)) |
1186 | { | |
1187 | to_timespec (timeout, &ctimeout); | |
1188 | timeout_ptr = &ctimeout; | |
1189 | } | |
1190 | ||
1191 | if (t->exited) | |
1192 | res = t->result; | |
1193 | else | |
d823b11b | 1194 | { |
9de87eea MV |
1195 | while (1) |
1196 | { | |
74926120 | 1197 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1198 | timeout_ptr); |
1199 | if (err == 0) | |
1200 | { | |
1201 | if (t->exited) | |
1202 | { | |
1203 | res = t->result; | |
1204 | break; | |
1205 | } | |
1206 | } | |
1207 | else if (err == ETIMEDOUT) | |
9de87eea | 1208 | break; |
6180e336 | 1209 | |
86a597f8 | 1210 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1211 | SCM_TICK; |
86a597f8 | 1212 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1213 | |
1214 | /* Check for exit again, since we just released and | |
1215 | reacquired the admin mutex, before the next block_self | |
1216 | call (which would block forever if t has already | |
1217 | exited). */ | |
1218 | if (t->exited) | |
1219 | { | |
1220 | res = t->result; | |
1221 | break; | |
1222 | } | |
9de87eea | 1223 | } |
d823b11b | 1224 | } |
9de87eea | 1225 | |
86a597f8 | 1226 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1227 | |
d823b11b | 1228 | return res; |
5f05c406 MV |
1229 | } |
1230 | #undef FUNC_NAME | |
1231 | ||
6180e336 NJ |
1232 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1233 | (SCM obj), | |
1234 | "Return @code{#t} if @var{obj} is a thread.") | |
1235 | #define FUNC_NAME s_scm_thread_p | |
1236 | { | |
1237 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1238 | } | |
1239 | #undef FUNC_NAME | |
5f05c406 | 1240 | |
4079f87e | 1241 | |
9de87eea MV |
1242 | static size_t |
1243 | fat_mutex_free (SCM mx) | |
76da80e7 | 1244 | { |
9de87eea MV |
1245 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1246 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1247 | return 0; |
1248 | } | |
1249 | ||
1250 | static int | |
9de87eea | 1251 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1252 | { |
9de87eea MV |
1253 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1254 | scm_puts ("#<mutex ", port); | |
1255 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1256 | scm_puts (">", port); | |
1257 | return 1; | |
76da80e7 MV |
1258 | } |
1259 | ||
76da80e7 | 1260 | static SCM |
6180e336 | 1261 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1262 | { |
9de87eea MV |
1263 | fat_mutex *m; |
1264 | SCM mx; | |
1265 | ||
1266 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1267 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1268 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1269 | m->level = 0; |
6180e336 | 1270 | |
adc085f1 | 1271 | m->recursive = recursive; |
6180e336 NJ |
1272 | m->unchecked_unlock = unchecked_unlock; |
1273 | m->allow_external_unlock = external_unlock; | |
1274 | ||
9de87eea MV |
1275 | m->waiting = SCM_EOL; |
1276 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1277 | m->waiting = make_queue (); | |
1278 | return mx; | |
76da80e7 MV |
1279 | } |
1280 | ||
6180e336 NJ |
1281 | SCM scm_make_mutex (void) |
1282 | { | |
1283 | return scm_make_mutex_with_flags (SCM_EOL); | |
1284 | } | |
1285 | ||
2a1d0688 NJ |
1286 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1287 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1288 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1289 | |
1290 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1291 | (SCM flags), | |
9de87eea | 1292 | "Create a new mutex. ") |
6180e336 | 1293 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1294 | { |
6180e336 NJ |
1295 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1296 | ||
1297 | SCM ptr = flags; | |
1298 | while (! scm_is_null (ptr)) | |
1299 | { | |
1300 | SCM flag = SCM_CAR (ptr); | |
1301 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1302 | unchecked_unlock = 1; | |
1303 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1304 | external_unlock = 1; | |
1305 | else if (scm_is_eq (flag, recursive_sym)) | |
1306 | recursive = 1; | |
74926120 | 1307 | else |
2a1d0688 | 1308 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1309 | ptr = SCM_CDR (ptr); |
1310 | } | |
1311 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1312 | } |
1313 | #undef FUNC_NAME | |
1314 | ||
9de87eea | 1315 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1316 | (void), |
9de87eea MV |
1317 | "Create a new recursive mutex. ") |
1318 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1319 | { |
6180e336 | 1320 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1321 | } |
1322 | #undef FUNC_NAME | |
1323 | ||
6180e336 NJ |
1324 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1325 | ||
1326 | static SCM | |
adc085f1 | 1327 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1328 | { |
1329 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1330 | |
adc085f1 | 1331 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1332 | SCM err = SCM_BOOL_F; |
1333 | ||
1334 | struct timeval current_time; | |
9de87eea MV |
1335 | |
1336 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1337 | |
1338 | while (1) | |
9de87eea | 1339 | { |
adc085f1 | 1340 | if (m->level == 0) |
6180e336 | 1341 | { |
adc085f1 | 1342 | m->owner = new_owner; |
6180e336 | 1343 | m->level++; |
74926120 | 1344 | |
adc085f1 | 1345 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1346 | { |
adc085f1 | 1347 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 | 1348 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1349 | |
1350 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1351 | retained when not referenced elsewhere (bug #27450). |
1352 | The weak pair itself is eventually removed when MUTEX | |
1353 | is unlocked. Note that `t->mutexes' lists mutexes | |
1354 | currently held by T, so it should be small. */ | |
a0faf7dd LC |
1355 | t->mutexes = scm_weak_car_pair (mutex, t->mutexes); |
1356 | ||
6180e336 | 1357 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1358 | } |
adc085f1 JG |
1359 | *ret = 1; |
1360 | break; | |
1361 | } | |
1362 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1363 | { | |
1364 | m->owner = new_owner; | |
1365 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1366 | scm_from_locale_string ("lock obtained on abandoned " | |
1367 | "mutex")); | |
1368 | *ret = 1; | |
1369 | break; | |
1370 | } | |
1371 | else if (scm_is_eq (m->owner, new_owner)) | |
1372 | { | |
1373 | if (m->recursive) | |
1374 | { | |
1375 | m->level++; | |
74926120 | 1376 | *ret = 1; |
adc085f1 JG |
1377 | } |
1378 | else | |
6180e336 | 1379 | { |
adc085f1 JG |
1380 | err = scm_cons (scm_misc_error_key, |
1381 | scm_from_locale_string ("mutex already locked " | |
1382 | "by thread")); | |
1383 | *ret = 0; | |
1384 | } | |
74926120 | 1385 | break; |
adc085f1 | 1386 | } |
9de87eea | 1387 | else |
9de87eea | 1388 | { |
74926120 | 1389 | if (timeout != NULL) |
adc085f1 JG |
1390 | { |
1391 | gettimeofday (¤t_time, NULL); | |
1392 | if (current_time.tv_sec > timeout->tv_sec || | |
1393 | (current_time.tv_sec == timeout->tv_sec && | |
1394 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1395 | { |
adc085f1 JG |
1396 | *ret = 0; |
1397 | break; | |
6180e336 | 1398 | } |
6180e336 | 1399 | } |
37a52039 | 1400 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1401 | scm_i_pthread_mutex_unlock (&m->lock); |
1402 | SCM_TICK; | |
1403 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1404 | } | |
1405 | } | |
1406 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1407 | return err; |
9de87eea MV |
1408 | } |
1409 | ||
6180e336 NJ |
1410 | SCM scm_lock_mutex (SCM mx) |
1411 | { | |
adc085f1 | 1412 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1413 | } |
1414 | ||
adc085f1 JG |
1415 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1416 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1417 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1418 | "blocks until the mutex becomes available. The function returns when " | |
1419 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1420 | "a thread already owns will succeed right away and will not block the " | |
1421 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1422 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1423 | { |
6180e336 NJ |
1424 | SCM exception; |
1425 | int ret = 0; | |
1426 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1427 | |
6180e336 NJ |
1428 | SCM_VALIDATE_MUTEX (1, m); |
1429 | ||
1430 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1431 | { | |
1432 | to_timespec (timeout, &cwaittime); | |
1433 | waittime = &cwaittime; | |
1434 | } | |
1435 | ||
adc085f1 | 1436 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1437 | if (!scm_is_false (exception)) |
1438 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1439 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1440 | } |
76da80e7 | 1441 | #undef FUNC_NAME |
9bc4701c | 1442 | |
a4d106c7 | 1443 | void |
661ae7ab | 1444 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1445 | { |
661ae7ab MV |
1446 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1447 | SCM_F_WIND_EXPLICITLY); | |
1448 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1449 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1450 | } |
1451 | ||
9bc4701c | 1452 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1453 | (SCM mutex), |
9bc4701c MD |
1454 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1455 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1456 | #define FUNC_NAME s_scm_try_mutex | |
1457 | { | |
6180e336 NJ |
1458 | SCM exception; |
1459 | int ret = 0; | |
1460 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1461 | |
ba1b7223 | 1462 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1463 | |
1464 | to_timespec (scm_from_int(0), &cwaittime); | |
1465 | waittime = &cwaittime; | |
74926120 | 1466 | |
adc085f1 | 1467 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1468 | if (!scm_is_false (exception)) |
1469 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1470 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1471 | } |
1472 | #undef FUNC_NAME | |
76da80e7 | 1473 | |
6180e336 NJ |
1474 | /*** Fat condition variables */ |
1475 | ||
1476 | typedef struct { | |
1477 | scm_i_pthread_mutex_t lock; | |
1478 | SCM waiting; /* the threads waiting for this condition. */ | |
1479 | } fat_cond; | |
1480 | ||
1481 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1482 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1483 | ||
1484 | static int | |
1485 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1486 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1487 | { |
7f991c7d | 1488 | SCM owner; |
6180e336 NJ |
1489 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1490 | fat_cond *c = NULL; | |
1491 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1492 | int err = 0, ret = 0; | |
9de87eea MV |
1493 | |
1494 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1495 | |
7f991c7d | 1496 | owner = m->owner; |
adc085f1 | 1497 | |
d31ae2c3 | 1498 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1499 | { |
adc085f1 | 1500 | if (m->level == 0) |
6180e336 NJ |
1501 | { |
1502 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1503 | { |
1504 | scm_i_pthread_mutex_unlock (&m->lock); | |
1505 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1506 | } | |
d31ae2c3 | 1507 | owner = t->handle; |
6180e336 NJ |
1508 | } |
1509 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1510 | { |
1511 | scm_i_pthread_mutex_unlock (&m->lock); | |
1512 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1513 | } | |
6180e336 NJ |
1514 | } |
1515 | ||
1516 | if (! (SCM_UNBNDP (cond))) | |
1517 | { | |
6180e336 NJ |
1518 | c = SCM_CONDVAR_DATA (cond); |
1519 | while (1) | |
1520 | { | |
1521 | int brk = 0; | |
1522 | ||
6180e336 NJ |
1523 | if (m->level > 0) |
1524 | m->level--; | |
adc085f1 | 1525 | if (m->level == 0) |
f57fdf07 LC |
1526 | { |
1527 | /* Change the owner of MUTEX. */ | |
1528 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1529 | m->owner = unblock_from_queue (m->waiting); | |
1530 | } | |
adc085f1 | 1531 | |
6180e336 | 1532 | t->block_asyncs++; |
74926120 | 1533 | |
d2a51087 NJ |
1534 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1535 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1536 | |
1537 | if (err == 0) | |
1538 | { | |
1539 | ret = 1; | |
1540 | brk = 1; | |
1541 | } | |
1542 | else if (err == ETIMEDOUT) | |
1543 | { | |
1544 | ret = 0; | |
1545 | brk = 1; | |
1546 | } | |
1547 | else if (err != EINTR) | |
74926120 | 1548 | { |
6180e336 | 1549 | errno = err; |
6180e336 | 1550 | scm_syserror (NULL); |
74926120 | 1551 | } |
6180e336 NJ |
1552 | |
1553 | if (brk) | |
1554 | { | |
1555 | if (relock) | |
adc085f1 | 1556 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1557 | t->block_asyncs--; |
6180e336 NJ |
1558 | break; |
1559 | } | |
74926120 | 1560 | |
6180e336 NJ |
1561 | t->block_asyncs--; |
1562 | scm_async_click (); | |
74926120 | 1563 | |
6180e336 NJ |
1564 | scm_remember_upto_here_2 (cond, mutex); |
1565 | ||
1566 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1567 | } | |
9bc4701c | 1568 | } |
9de87eea | 1569 | else |
6180e336 NJ |
1570 | { |
1571 | if (m->level > 0) | |
1572 | m->level--; | |
74926120 | 1573 | if (m->level == 0) |
f57fdf07 LC |
1574 | { |
1575 | /* Change the owner of MUTEX. */ | |
1576 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1577 | m->owner = unblock_from_queue (m->waiting); | |
1578 | } | |
74926120 | 1579 | |
6180e336 NJ |
1580 | scm_i_pthread_mutex_unlock (&m->lock); |
1581 | ret = 1; | |
1582 | } | |
9de87eea | 1583 | |
6180e336 | 1584 | return ret; |
9bc4701c | 1585 | } |
9bc4701c | 1586 | |
6180e336 NJ |
1587 | SCM scm_unlock_mutex (SCM mx) |
1588 | { | |
1589 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1590 | } |
9bc4701c | 1591 | |
6180e336 NJ |
1592 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1593 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1594 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1595 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1596 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1597 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1598 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1599 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1600 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1601 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1602 | { |
6180e336 NJ |
1603 | scm_t_timespec cwaittime, *waittime = NULL; |
1604 | ||
9bc4701c | 1605 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1606 | if (! (SCM_UNBNDP (cond))) |
1607 | { | |
1608 | SCM_VALIDATE_CONDVAR (2, cond); | |
1609 | ||
1610 | if (! (SCM_UNBNDP (timeout))) | |
1611 | { | |
1612 | to_timespec (timeout, &cwaittime); | |
1613 | waittime = &cwaittime; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1618 | } |
1619 | #undef FUNC_NAME | |
1620 | ||
6180e336 NJ |
1621 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1622 | (SCM obj), | |
1623 | "Return @code{#t} if @var{obj} is a mutex.") | |
1624 | #define FUNC_NAME s_scm_mutex_p | |
1625 | { | |
1626 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1627 | } | |
74926120 | 1628 | #undef FUNC_NAME |
9de87eea MV |
1629 | |
1630 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1631 | (SCM mx), | |
1632 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1633 | #define FUNC_NAME s_scm_mutex_owner | |
1634 | { | |
adc085f1 JG |
1635 | SCM owner; |
1636 | fat_mutex *m = NULL; | |
1637 | ||
9de87eea | 1638 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1639 | m = SCM_MUTEX_DATA (mx); |
1640 | scm_i_pthread_mutex_lock (&m->lock); | |
1641 | owner = m->owner; | |
1642 | scm_i_pthread_mutex_unlock (&m->lock); | |
1643 | ||
1644 | return owner; | |
9de87eea MV |
1645 | } |
1646 | #undef FUNC_NAME | |
1647 | ||
1648 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1649 | (SCM mx), | |
adc085f1 | 1650 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1651 | #define FUNC_NAME s_scm_mutex_level |
1652 | { | |
1653 | SCM_VALIDATE_MUTEX (1, mx); | |
1654 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1655 | } | |
1656 | #undef FUNC_NAME | |
1657 | ||
adc085f1 JG |
1658 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1659 | (SCM mx), | |
1660 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1661 | #define FUNC_NAME s_scm_mutex_locked_p | |
1662 | { | |
1663 | SCM_VALIDATE_MUTEX (1, mx); | |
1664 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1665 | } | |
1666 | #undef FUNC_NAME | |
9de87eea | 1667 | |
9de87eea MV |
1668 | static int |
1669 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1670 | { | |
1671 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1672 | scm_puts ("#<condition-variable ", port); | |
1673 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1674 | scm_puts (">", port); | |
1675 | return 1; | |
1676 | } | |
9bc4701c | 1677 | |
d823b11b MV |
1678 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1679 | (void), | |
1680 | "Make a new condition variable.") | |
1681 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1682 | { |
9de87eea MV |
1683 | fat_cond *c; |
1684 | SCM cv; | |
1685 | ||
1686 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1687 | c->waiting = SCM_EOL; |
1688 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1689 | c->waiting = make_queue (); | |
d823b11b | 1690 | return cv; |
5f05c406 | 1691 | } |
d823b11b | 1692 | #undef FUNC_NAME |
5f05c406 | 1693 | |
d823b11b MV |
1694 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1695 | (SCM cv, SCM mx, SCM t), | |
1696 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1697 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1698 | "is locked again when this function returns. When @var{time} is given, " | |
1699 | "it specifies a point in time where the waiting should be aborted. It " | |
1700 | "can be either a integer as returned by @code{current-time} or a pair " | |
1701 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1702 | "mutex is locked and @code{#f} is returned. When the condition " | |
1703 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1704 | "is returned. ") | |
1705 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1706 | { |
9de87eea | 1707 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1708 | |
1709 | SCM_VALIDATE_CONDVAR (1, cv); | |
1710 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1711 | |
d823b11b MV |
1712 | if (!SCM_UNBNDP (t)) |
1713 | { | |
6180e336 | 1714 | to_timespec (t, &waittime); |
9de87eea | 1715 | waitptr = &waittime; |
d823b11b MV |
1716 | } |
1717 | ||
2a1d0688 | 1718 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1719 | } |
d823b11b | 1720 | #undef FUNC_NAME |
5f05c406 | 1721 | |
9de87eea MV |
1722 | static void |
1723 | fat_cond_signal (fat_cond *c) | |
1724 | { | |
9de87eea | 1725 | unblock_from_queue (c->waiting); |
9de87eea MV |
1726 | } |
1727 | ||
d823b11b MV |
1728 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1729 | (SCM cv), | |
1730 | "Wake up one thread that is waiting for @var{cv}") | |
1731 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1732 | { |
d823b11b | 1733 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1734 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1735 | return SCM_BOOL_T; |
5f05c406 | 1736 | } |
d823b11b | 1737 | #undef FUNC_NAME |
5f05c406 | 1738 | |
9de87eea MV |
1739 | static void |
1740 | fat_cond_broadcast (fat_cond *c) | |
1741 | { | |
9de87eea MV |
1742 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1743 | ; | |
9de87eea MV |
1744 | } |
1745 | ||
d823b11b MV |
1746 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1747 | (SCM cv), | |
1748 | "Wake up all threads that are waiting for @var{cv}. ") | |
1749 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1750 | { |
d823b11b | 1751 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1752 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1753 | return SCM_BOOL_T; |
5f05c406 | 1754 | } |
d823b11b | 1755 | #undef FUNC_NAME |
5f05c406 | 1756 | |
6180e336 NJ |
1757 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1758 | (SCM obj), | |
1759 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1760 | #define FUNC_NAME s_scm_condition_variable_p | |
1761 | { | |
1762 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1763 | } | |
1764 | #undef FUNC_NAME | |
1765 | ||
6087fad9 | 1766 | |
8c2b3143 | 1767 | \f |
d823b11b MV |
1768 | /*** Select */ |
1769 | ||
8c2b3143 LC |
1770 | struct select_args |
1771 | { | |
1772 | int nfds; | |
1773 | SELECT_TYPE *read_fds; | |
1774 | SELECT_TYPE *write_fds; | |
1775 | SELECT_TYPE *except_fds; | |
1776 | struct timeval *timeout; | |
1777 | ||
1778 | int result; | |
1779 | int errno_value; | |
1780 | }; | |
1781 | ||
1782 | static void * | |
1783 | do_std_select (void *args) | |
1784 | { | |
1785 | struct select_args *select_args; | |
1786 | ||
1787 | select_args = (struct select_args *) args; | |
1788 | ||
1789 | select_args->result = | |
1790 | select (select_args->nfds, | |
1791 | select_args->read_fds, select_args->write_fds, | |
1792 | select_args->except_fds, select_args->timeout); | |
1793 | select_args->errno_value = errno; | |
1794 | ||
1795 | return NULL; | |
1796 | } | |
1797 | ||
911782b7 | 1798 | int |
9de87eea MV |
1799 | scm_std_select (int nfds, |
1800 | SELECT_TYPE *readfds, | |
1801 | SELECT_TYPE *writefds, | |
1802 | SELECT_TYPE *exceptfds, | |
1803 | struct timeval *timeout) | |
1804 | { | |
1805 | fd_set my_readfds; | |
1806 | int res, eno, wakeup_fd; | |
1807 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1808 | struct select_args args; |
9de87eea MV |
1809 | |
1810 | if (readfds == NULL) | |
1811 | { | |
1812 | FD_ZERO (&my_readfds); | |
1813 | readfds = &my_readfds; | |
1814 | } | |
1815 | ||
1816 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1817 | SCM_TICK; | |
1818 | ||
1819 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1820 | FD_SET (wakeup_fd, readfds); |
1821 | if (wakeup_fd >= nfds) | |
1822 | nfds = wakeup_fd+1; | |
9de87eea | 1823 | |
8c2b3143 LC |
1824 | args.nfds = nfds; |
1825 | args.read_fds = readfds; | |
1826 | args.write_fds = writefds; | |
1827 | args.except_fds = exceptfds; | |
1828 | args.timeout = timeout; | |
1829 | ||
1830 | /* Explicitly cooperate with the GC. */ | |
1831 | scm_without_guile (do_std_select, &args); | |
1832 | ||
1833 | res = args.result; | |
1834 | eno = args.errno_value; | |
1835 | ||
1836 | t->sleep_fd = -1; | |
9de87eea MV |
1837 | scm_i_reset_sleep (t); |
1838 | ||
1839 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1840 | { | |
1841 | char dummy; | |
634aa8de LC |
1842 | full_read (wakeup_fd, &dummy, 1); |
1843 | ||
9de87eea MV |
1844 | FD_CLR (wakeup_fd, readfds); |
1845 | res -= 1; | |
1846 | if (res == 0) | |
1847 | { | |
1848 | eno = EINTR; | |
1849 | res = -1; | |
1850 | } | |
1851 | } | |
d823b11b MV |
1852 | errno = eno; |
1853 | return res; | |
5f05c406 MV |
1854 | } |
1855 | ||
9de87eea | 1856 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1857 | |
9de87eea | 1858 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1859 | |
2956b071 LC |
1860 | /* It seems reasonable to not run procedures related to mutex and condition |
1861 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1862 | without it, and (ii) the only potential gain would be GC latency. See | |
1863 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1864 | for a discussion of the pros and cons. */ | |
1865 | ||
9bc4701c | 1866 | int |
9de87eea | 1867 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1868 | { |
9de87eea | 1869 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1870 | return res; |
1871 | } | |
1872 | ||
9de87eea | 1873 | static void |
2b829bbb | 1874 | do_unlock (void *data) |
28d52ebb | 1875 | { |
9de87eea | 1876 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1877 | } |
1878 | ||
1879 | void | |
661ae7ab | 1880 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1881 | { |
9de87eea | 1882 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1883 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1884 | } |
1885 | ||
9bc4701c | 1886 | int |
9de87eea | 1887 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1888 | { |
4cf72f0b LC |
1889 | int res; |
1890 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1891 | ||
1892 | t->held_mutex = mutex; | |
1893 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1894 | t->held_mutex = NULL; | |
1895 | ||
9bc4701c MD |
1896 | return res; |
1897 | } | |
9bc4701c | 1898 | |
76da80e7 | 1899 | int |
9de87eea MV |
1900 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1901 | scm_i_pthread_mutex_t *mutex, | |
1902 | const scm_t_timespec *wt) | |
76da80e7 | 1903 | { |
4cf72f0b LC |
1904 | int res; |
1905 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1906 | ||
1907 | t->held_mutex = mutex; | |
1908 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1909 | t->held_mutex = NULL; | |
1910 | ||
9de87eea | 1911 | return res; |
76da80e7 MV |
1912 | } |
1913 | ||
9de87eea | 1914 | #endif |
76da80e7 | 1915 | |
d823b11b | 1916 | unsigned long |
9de87eea | 1917 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1918 | { |
d823b11b MV |
1919 | struct timeval tv; |
1920 | tv.tv_usec = usecs % 1000000; | |
1921 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1922 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1923 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1924 | } |
1925 | ||
9de87eea MV |
1926 | unsigned int |
1927 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1928 | { |
d823b11b MV |
1929 | struct timeval tv; |
1930 | tv.tv_usec = 0; | |
1931 | tv.tv_sec = secs; | |
9de87eea | 1932 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1933 | return tv.tv_sec; |
6c214b62 MD |
1934 | } |
1935 | ||
d823b11b MV |
1936 | /*** Misc */ |
1937 | ||
1938 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1939 | (void), | |
1940 | "Return the thread that called this function.") | |
1941 | #define FUNC_NAME s_scm_current_thread | |
1942 | { | |
9de87eea | 1943 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1944 | } |
1945 | #undef FUNC_NAME | |
1946 | ||
9de87eea MV |
1947 | static SCM |
1948 | scm_c_make_list (size_t n, SCM fill) | |
1949 | { | |
1950 | SCM res = SCM_EOL; | |
1951 | while (n-- > 0) | |
1952 | res = scm_cons (fill, res); | |
1953 | return res; | |
1954 | } | |
1955 | ||
d823b11b MV |
1956 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1957 | (void), | |
1958 | "Return a list of all threads.") | |
9bc4701c | 1959 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1960 | { |
9de87eea MV |
1961 | /* We can not allocate while holding the thread_admin_mutex because |
1962 | of the way GC is done. | |
1963 | */ | |
1964 | int n = thread_count; | |
1965 | scm_i_thread *t; | |
1966 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1967 | |
9de87eea MV |
1968 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1969 | l = &list; | |
1970 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1971 | { | |
2e77f720 LC |
1972 | if (t != scm_i_signal_delivery_thread) |
1973 | { | |
1974 | SCM_SETCAR (*l, t->handle); | |
1975 | l = SCM_CDRLOC (*l); | |
1976 | } | |
9de87eea MV |
1977 | n--; |
1978 | } | |
1979 | *l = SCM_EOL; | |
1980 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1981 | return list; | |
d823b11b | 1982 | } |
9de87eea | 1983 | #undef FUNC_NAME |
d823b11b MV |
1984 | |
1985 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1986 | (SCM thread), | |
1987 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1988 | #define FUNC_NAME s_scm_thread_exited_p | |
1989 | { | |
7888309b | 1990 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1991 | } |
1992 | #undef FUNC_NAME | |
1993 | ||
911782b7 | 1994 | int |
d823b11b MV |
1995 | scm_c_thread_exited_p (SCM thread) |
1996 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1997 | { |
9de87eea | 1998 | scm_i_thread *t; |
d823b11b | 1999 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 2000 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 2001 | return t->exited; |
5f05c406 | 2002 | } |
d823b11b | 2003 | #undef FUNC_NAME |
5f05c406 | 2004 | |
9de87eea | 2005 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
2006 | static int threads_initialized_p = 0; |
2007 | ||
9bc4701c | 2008 | |
a4d106c7 MV |
2009 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2010 | */ | |
d1138028 | 2011 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 2012 | |
661ae7ab | 2013 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2014 | |
9bc4701c | 2015 | void |
661ae7ab | 2016 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2017 | { |
a4d106c7 | 2018 | if (scm_is_false (mutex)) |
661ae7ab MV |
2019 | mutex = dynwind_critical_section_mutex; |
2020 | scm_dynwind_lock_mutex (mutex); | |
2021 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2022 | } |
2023 | ||
2024 | /*** Initialization */ | |
2025 | ||
9de87eea MV |
2026 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2027 | ||
d1138028 MV |
2028 | #if SCM_USE_PTHREAD_THREADS |
2029 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2030 | #endif | |
2031 | ||
9de87eea | 2032 | void |
12c1d861 | 2033 | scm_threads_prehistory (void *base) |
9de87eea | 2034 | { |
d1138028 MV |
2035 | #if SCM_USE_PTHREAD_THREADS |
2036 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2037 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2038 | PTHREAD_MUTEX_RECURSIVE); | |
2039 | #endif | |
2040 | ||
2041 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2042 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2043 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2044 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2045 | |
12c1d861 | 2046 | guilify_self_1 ((struct GC_stack_base *) base); |
9bc4701c MD |
2047 | } |
2048 | ||
d823b11b MV |
2049 | scm_t_bits scm_tc16_thread; |
2050 | scm_t_bits scm_tc16_mutex; | |
2051 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2052 | |
7bfd3b9e | 2053 | void |
9de87eea | 2054 | scm_init_threads () |
7bfd3b9e | 2055 | { |
9de87eea | 2056 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2057 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2058 | |
9de87eea | 2059 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2060 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2061 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2062 | |
9de87eea MV |
2063 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2064 | sizeof (fat_cond)); | |
9de87eea | 2065 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2066 | |
9de87eea MV |
2067 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2068 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2069 | threads_initialized_p = 1; |
a4d106c7 | 2070 | |
f39448c5 | 2071 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2072 | } |
89e00824 | 2073 | |
5f05c406 | 2074 | void |
9de87eea | 2075 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2076 | { |
9de87eea | 2077 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2078 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2079 | } |
2080 | ||
d823b11b | 2081 | void |
9de87eea | 2082 | scm_init_thread_procs () |
d823b11b | 2083 | { |
9de87eea | 2084 | #include "libguile/threads.x" |
d823b11b MV |
2085 | } |
2086 | ||
3c13664e LC |
2087 | \f |
2088 | /* IA64-specific things. */ | |
2089 | ||
2090 | #ifdef __ia64__ | |
2091 | # ifdef __hpux | |
2092 | # include <sys/param.h> | |
2093 | # include <sys/pstat.h> | |
2094 | void * | |
2095 | scm_ia64_register_backing_store_base (void) | |
2096 | { | |
2097 | struct pst_vm_status vm_status; | |
2098 | int i = 0; | |
2099 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2100 | if (vm_status.pst_type == PS_RSESTACK) | |
2101 | return (void *) vm_status.pst_vaddr; | |
2102 | abort (); | |
2103 | } | |
2104 | void * | |
2105 | scm_ia64_ar_bsp (const void *ctx) | |
2106 | { | |
2107 | uint64_t bsp; | |
2108 | __uc_get_ar_bsp (ctx, &bsp); | |
2109 | return (void *) bsp; | |
2110 | } | |
2111 | # endif /* hpux */ | |
2112 | # ifdef linux | |
2113 | # include <ucontext.h> | |
2114 | void * | |
2115 | scm_ia64_register_backing_store_base (void) | |
2116 | { | |
2117 | extern void *__libc_ia64_register_backing_store_base; | |
2118 | return __libc_ia64_register_backing_store_base; | |
2119 | } | |
2120 | void * | |
2121 | scm_ia64_ar_bsp (const void *opaque) | |
2122 | { | |
2123 | const ucontext_t *ctx = opaque; | |
2124 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2125 | } | |
2126 | # endif /* linux */ | |
2127 | #endif /* __ia64__ */ | |
2128 | ||
2129 | ||
89e00824 ML |
2130 | /* |
2131 | Local Variables: | |
2132 | c-file-style: "gnu" | |
2133 | End: | |
2134 | */ |