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 | 41 | #include <assert.h> |
d20912e6 | 42 | #include <nproc.h> |
f57fdf07 | 43 | |
d823b11b MV |
44 | #include "libguile/validate.h" |
45 | #include "libguile/root.h" | |
46 | #include "libguile/eval.h" | |
47 | #include "libguile/async.h" | |
48 | #include "libguile/ports.h" | |
49 | #include "libguile/threads.h" | |
a0599745 | 50 | #include "libguile/dynwind.h" |
d823b11b | 51 | #include "libguile/iselect.h" |
9de87eea MV |
52 | #include "libguile/fluids.h" |
53 | #include "libguile/continuations.h" | |
2b829bbb | 54 | #include "libguile/gc.h" |
9de87eea | 55 | #include "libguile/init.h" |
2e77f720 | 56 | #include "libguile/scmsigs.h" |
6180e336 | 57 | #include "libguile/strings.h" |
a0faf7dd | 58 | #include "libguile/weaks.h" |
7bfd3b9e | 59 | |
ecc9f40f MV |
60 | #ifdef __MINGW32__ |
61 | #ifndef ETIMEDOUT | |
62 | # define ETIMEDOUT WSAETIMEDOUT | |
63 | #endif | |
64 | # include <fcntl.h> | |
65 | # include <process.h> | |
66 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
67 | #endif /* __MINGW32__ */ | |
68 | ||
634aa8de LC |
69 | #include <full-read.h> |
70 | ||
cde24ce1 AW |
71 | |
72 | \f | |
73 | ||
74 | /* First some libgc shims. */ | |
75 | ||
76 | /* Make sure GC_fn_type is defined; it is missing from the public | |
77 | headers of GC 7.1 and earlier. */ | |
78 | #ifndef HAVE_GC_FN_TYPE | |
79 | typedef void * (* GC_fn_type) (void *); | |
80 | #endif | |
81 | ||
82 | ||
5f0d2951 AW |
83 | #ifndef GC_SUCCESS |
84 | #define GC_SUCCESS 0 | |
85 | #endif | |
86 | ||
87 | #ifndef GC_UNIMPLEMENTED | |
88 | #define GC_UNIMPLEMENTED 3 | |
89 | #endif | |
90 | ||
91 | /* Likewise struct GC_stack_base is missing before 7.1. */ | |
92 | #ifndef HAVE_GC_STACK_BASE | |
12c1d861 AW |
93 | struct GC_stack_base { |
94 | void * mem_base; /* Base of memory stack. */ | |
95 | #ifdef __ia64__ | |
96 | void * reg_base; /* Base of separate register stack. */ | |
97 | #endif | |
98 | }; | |
5f0d2951 AW |
99 | |
100 | static int | |
987b8160 | 101 | GC_register_my_thread (struct GC_stack_base *stack_base) |
5f0d2951 AW |
102 | { |
103 | return GC_UNIMPLEMENTED; | |
104 | } | |
105 | ||
106 | static void | |
107 | GC_unregister_my_thread () | |
108 | { | |
109 | } | |
110 | ||
12c1d861 AW |
111 | #if !SCM_USE_PTHREAD_THREADS |
112 | /* No threads; we can just use GC_stackbottom. */ | |
5f0d2951 | 113 | static void * |
12c1d861 AW |
114 | get_thread_stack_base () |
115 | { | |
116 | return GC_stackbottom; | |
117 | } | |
118 | ||
119 | #elif defined HAVE_PTHREAD_ATTR_GETSTACK && defined HAVE_PTHREAD_GETATTR_NP \ | |
120 | && defined PTHREAD_ATTR_GETSTACK_WORKS | |
121 | /* This method for GNU/Linux and perhaps some other systems. | |
122 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
123 | available on them. */ | |
124 | static void * | |
125 | get_thread_stack_base () | |
126 | { | |
127 | pthread_attr_t attr; | |
128 | void *start, *end; | |
129 | size_t size; | |
130 | ||
131 | pthread_getattr_np (pthread_self (), &attr); | |
132 | pthread_attr_getstack (&attr, &start, &size); | |
133 | end = (char *)start + size; | |
134 | ||
135 | #if SCM_STACK_GROWS_UP | |
136 | return start; | |
137 | #else | |
138 | return end; | |
139 | #endif | |
140 | } | |
141 | ||
142 | #elif defined HAVE_PTHREAD_GET_STACKADDR_NP | |
143 | /* This method for MacOS X. | |
144 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
145 | but as of 2006 there's nothing obvious at apple.com. */ | |
146 | static void * | |
147 | get_thread_stack_base () | |
148 | { | |
149 | return pthread_get_stackaddr_np (pthread_self ()); | |
150 | } | |
151 | ||
152 | #else | |
153 | #error Threads enabled with old BDW-GC, but missing get_thread_stack_base impl. Please upgrade to libgc >= 7.1. | |
154 | #endif | |
155 | ||
156 | static int | |
987b8160 | 157 | GC_get_stack_base (struct GC_stack_base *stack_base) |
5f0d2951 | 158 | { |
12c1d861 AW |
159 | stack_base->mem_base = get_thread_stack_base (); |
160 | #ifdef __ia64__ | |
161 | /* Calculate and store off the base of this thread's register | |
162 | backing store (RBS). Unfortunately our implementation(s) of | |
163 | scm_ia64_register_backing_store_base are only reliable for the | |
164 | main thread. For other threads, therefore, find out the current | |
165 | top of the RBS, and use that as a maximum. */ | |
166 | stack_base->reg_base = scm_ia64_register_backing_store_base (); | |
167 | { | |
168 | ucontext_t ctx; | |
169 | void *bsp; | |
170 | getcontext (&ctx); | |
171 | bsp = scm_ia64_ar_bsp (&ctx); | |
172 | if (stack_base->reg_base > bsp) | |
173 | stack_base->reg_base = bsp; | |
174 | } | |
175 | #endif | |
176 | return GC_SUCCESS; | |
5f0d2951 | 177 | } |
12c1d861 AW |
178 | |
179 | static void * | |
180 | GC_call_with_stack_base(void * (*fn) (struct GC_stack_base*, void*), void *arg) | |
181 | { | |
182 | struct GC_stack_base stack_base; | |
183 | ||
184 | stack_base.mem_base = (void*)&stack_base; | |
185 | #ifdef __ia64__ | |
186 | /* FIXME: Untested. */ | |
187 | { | |
188 | ucontext_t ctx; | |
189 | getcontext (&ctx); | |
190 | stack_base.reg_base = scm_ia64_ar_bsp (&ctx); | |
191 | } | |
5f0d2951 AW |
192 | #endif |
193 | ||
12c1d861 AW |
194 | return fn (&stack_base, arg); |
195 | } | |
196 | #endif /* HAVE_GC_STACK_BASE */ | |
197 | ||
5f0d2951 | 198 | |
cde24ce1 AW |
199 | /* Now define with_gc_active and with_gc_inactive. */ |
200 | ||
201 | #if (defined(HAVE_GC_DO_BLOCKING) && defined (HAVE_DECL_GC_DO_BLOCKING) && defined (HAVE_GC_CALL_WITH_GC_ACTIVE)) | |
202 | ||
203 | /* We have a sufficiently new libgc (7.2 or newer). */ | |
204 | ||
205 | static void* | |
206 | with_gc_inactive (GC_fn_type func, void *data) | |
207 | { | |
208 | return GC_do_blocking (func, data); | |
209 | } | |
210 | ||
211 | static void* | |
212 | with_gc_active (GC_fn_type func, void *data) | |
213 | { | |
214 | return GC_call_with_gc_active (func, data); | |
215 | } | |
216 | ||
217 | #else | |
218 | ||
219 | /* libgc not new enough, so never actually deactivate GC. | |
220 | ||
221 | Note that though GC 7.1 does have a GC_do_blocking, it doesn't have | |
222 | GC_call_with_gc_active. */ | |
223 | ||
224 | static void* | |
225 | with_gc_inactive (GC_fn_type func, void *data) | |
226 | { | |
227 | return func (data); | |
228 | } | |
229 | ||
230 | static void* | |
231 | with_gc_active (GC_fn_type func, void *data) | |
232 | { | |
233 | return func (data); | |
234 | } | |
235 | ||
236 | #endif /* HAVE_GC_DO_BLOCKING */ | |
237 | ||
238 | ||
634aa8de | 239 | \f |
6180e336 NJ |
240 | static void |
241 | to_timespec (SCM t, scm_t_timespec *waittime) | |
242 | { | |
243 | if (scm_is_pair (t)) | |
244 | { | |
245 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
246 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
247 | } | |
248 | else | |
249 | { | |
250 | double time = scm_to_double (t); | |
251 | double sec = scm_c_truncate (time); | |
252 | ||
253 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 254 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
255 | } |
256 | } | |
257 | ||
c058db8a | 258 | \f |
d823b11b | 259 | /*** Queues */ |
7bfd3b9e | 260 | |
c058db8a LC |
261 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
262 | the risk of false references leading to unbounded retained space as | |
263 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
264 | H.J. Boehm, 2001. */ | |
265 | ||
9de87eea MV |
266 | /* Make an empty queue data structure. |
267 | */ | |
d823b11b MV |
268 | static SCM |
269 | make_queue () | |
270 | { | |
271 | return scm_cons (SCM_EOL, SCM_EOL); | |
272 | } | |
7bfd3b9e | 273 | |
9de87eea MV |
274 | /* Put T at the back of Q and return a handle that can be used with |
275 | remqueue to remove T from Q again. | |
276 | */ | |
d823b11b MV |
277 | static SCM |
278 | enqueue (SCM q, SCM t) | |
279 | { | |
280 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 281 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 282 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
283 | SCM_SETCDR (q, c); |
284 | else | |
285 | SCM_SETCDR (SCM_CAR (q), c); | |
286 | SCM_SETCAR (q, c); | |
d2a51087 | 287 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
288 | return c; |
289 | } | |
7bfd3b9e | 290 | |
9de87eea MV |
291 | /* Remove the element that the handle C refers to from the queue Q. C |
292 | must have been returned from a call to enqueue. The return value | |
293 | is zero when the element referred to by C has already been removed. | |
294 | Otherwise, 1 is returned. | |
295 | */ | |
296 | static int | |
d823b11b MV |
297 | remqueue (SCM q, SCM c) |
298 | { | |
299 | SCM p, prev = q; | |
d2a51087 | 300 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 301 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 302 | { |
bc36d050 | 303 | if (scm_is_eq (p, c)) |
d823b11b | 304 | { |
bc36d050 | 305 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
306 | SCM_SETCAR (q, SCM_CDR (c)); |
307 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
308 | |
309 | /* GC-robust */ | |
310 | SCM_SETCDR (c, SCM_EOL); | |
311 | ||
d2a51087 | 312 | SCM_CRITICAL_SECTION_END; |
9de87eea | 313 | return 1; |
d823b11b MV |
314 | } |
315 | prev = p; | |
316 | } | |
d2a51087 | 317 | SCM_CRITICAL_SECTION_END; |
9de87eea | 318 | return 0; |
d823b11b MV |
319 | } |
320 | ||
9de87eea MV |
321 | /* Remove the front-most element from the queue Q and return it. |
322 | Return SCM_BOOL_F when Q is empty. | |
323 | */ | |
d823b11b MV |
324 | static SCM |
325 | dequeue (SCM q) | |
326 | { | |
d2a51087 NJ |
327 | SCM c; |
328 | SCM_CRITICAL_SECTION_START; | |
329 | c = SCM_CDR (q); | |
d2e53ed6 | 330 | if (scm_is_null (c)) |
d2a51087 NJ |
331 | { |
332 | SCM_CRITICAL_SECTION_END; | |
333 | return SCM_BOOL_F; | |
334 | } | |
d823b11b MV |
335 | else |
336 | { | |
337 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 338 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 339 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 340 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
341 | |
342 | /* GC-robust */ | |
343 | SCM_SETCDR (c, SCM_EOL); | |
344 | ||
d823b11b MV |
345 | return SCM_CAR (c); |
346 | } | |
347 | } | |
7bfd3b9e | 348 | |
9de87eea | 349 | /*** Thread smob routines */ |
76da80e7 | 350 | |
d823b11b MV |
351 | |
352 | static int | |
353 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
354 | { | |
23d72566 KR |
355 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
356 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
357 | the struct case, hence we go via a union, and extract according to the | |
358 | size of pthread_t. */ | |
359 | union { | |
360 | scm_i_pthread_t p; | |
361 | unsigned short us; | |
362 | unsigned int ui; | |
363 | unsigned long ul; | |
364 | scm_t_uintmax um; | |
365 | } u; | |
9de87eea | 366 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
367 | scm_i_pthread_t p = t->pthread; |
368 | scm_t_uintmax id; | |
369 | u.p = p; | |
370 | if (sizeof (p) == sizeof (unsigned short)) | |
371 | id = u.us; | |
372 | else if (sizeof (p) == sizeof (unsigned int)) | |
373 | id = u.ui; | |
374 | else if (sizeof (p) == sizeof (unsigned long)) | |
375 | id = u.ul; | |
376 | else | |
377 | id = u.um; | |
378 | ||
d823b11b | 379 | scm_puts ("#<thread ", port); |
23d72566 | 380 | scm_uintprint (id, 10, port); |
1b92fb6b | 381 | scm_puts (" (", port); |
0345e278 | 382 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 383 | scm_puts (")>", port); |
d823b11b MV |
384 | return 1; |
385 | } | |
386 | ||
706846f6 | 387 | \f |
9de87eea | 388 | /*** Blocking on queues. */ |
f7eca35d | 389 | |
9de87eea MV |
390 | /* See also scm_i_queue_async_cell for how such a block is |
391 | interrputed. | |
392 | */ | |
d823b11b | 393 | |
9de87eea MV |
394 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
395 | be woken up by a call to 'unblock_from_queue', or to be | |
396 | interrupted. Upon return of this function, the current thread is | |
397 | no longer on QUEUE, even when the sleep has been interrupted. | |
398 | ||
d2a51087 | 399 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
400 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
401 | ||
402 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
403 | as MUTEX is needed. | |
404 | ||
405 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
406 | ||
407 | The return value of block_self is an errno value. It will be zero | |
408 | when the sleep has been successfully completed by a call to | |
409 | unblock_from_queue, EINTR when it has been interrupted by the | |
410 | delivery of a system async, and ETIMEDOUT when the timeout has | |
411 | expired. | |
412 | ||
413 | The system asyncs themselves are not executed by block_self. | |
414 | */ | |
415 | static int | |
416 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
417 | const scm_t_timespec *waittime) | |
76da80e7 | 418 | { |
9de87eea MV |
419 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
420 | SCM q_handle; | |
421 | int err; | |
422 | ||
423 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
424 | err = EINTR; | |
425 | else | |
426 | { | |
427 | t->block_asyncs++; | |
428 | q_handle = enqueue (queue, t->handle); | |
429 | if (waittime == NULL) | |
430 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
431 | else | |
432 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
433 | ||
434 | /* When we are still on QUEUE, we have been interrupted. We | |
435 | report this only when no other error (such as a timeout) has | |
436 | happened above. | |
437 | */ | |
438 | if (remqueue (queue, q_handle) && err == 0) | |
439 | err = EINTR; | |
440 | t->block_asyncs--; | |
441 | scm_i_reset_sleep (t); | |
442 | } | |
443 | ||
444 | return err; | |
76da80e7 | 445 | } |
9de87eea | 446 | |
d2a51087 NJ |
447 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
448 | returned, or #f if the queue was empty. | |
9de87eea MV |
449 | */ |
450 | static SCM | |
451 | unblock_from_queue (SCM queue) | |
452 | { | |
453 | SCM thread = dequeue (queue); | |
454 | if (scm_is_true (thread)) | |
455 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
456 | return thread; | |
457 | } | |
458 | ||
45f15cac | 459 | \f |
9de87eea MV |
460 | /* Getting into and out of guile mode. |
461 | */ | |
462 | ||
f60a7648 AW |
463 | /* Key used to attach a cleanup handler to a given thread. Also, if |
464 | thread-local storage is unavailable, this key is used to retrieve the | |
465 | current thread with `pthread_getspecific ()'. */ | |
466 | scm_i_pthread_key_t scm_i_thread_key; | |
467 | ||
468 | ||
705edb95 LC |
469 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
470 | ||
471 | /* When thread-local storage (TLS) is available, a pointer to the | |
472 | current-thread object is kept in TLS. Note that storing the thread-object | |
473 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
474 | possible since thread objects may live longer than the actual thread they | |
475 | represent. */ | |
476 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
477 | ||
f60a7648 | 478 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 479 | |
d823b11b | 480 | |
9de87eea MV |
481 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
482 | static scm_i_thread *all_threads = NULL; | |
483 | static int thread_count; | |
484 | ||
485 | static SCM scm_i_default_dynamic_state; | |
486 | ||
487 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 488 | */ |
9de87eea | 489 | static void |
12c1d861 | 490 | guilify_self_1 (struct GC_stack_base *base) |
d823b11b | 491 | { |
7f22442b AW |
492 | scm_i_thread t; |
493 | ||
494 | /* We must arrange for SCM_I_CURRENT_THREAD to point to a valid value | |
495 | before allocating anything in this thread, because allocation could | |
496 | cause GC to run, and GC could cause finalizers, which could invoke | |
497 | Scheme functions, which need the current thread to be set. */ | |
498 | ||
499 | t.pthread = scm_i_pthread_self (); | |
500 | t.handle = SCM_BOOL_F; | |
501 | t.result = SCM_BOOL_F; | |
502 | t.cleanup_handler = SCM_BOOL_F; | |
503 | t.mutexes = SCM_EOL; | |
504 | t.held_mutex = NULL; | |
505 | t.join_queue = SCM_EOL; | |
506 | t.dynamic_state = SCM_BOOL_F; | |
507 | t.dynwinds = SCM_EOL; | |
508 | t.active_asyncs = SCM_EOL; | |
509 | t.block_asyncs = 1; | |
510 | t.pending_asyncs = 1; | |
511 | t.critical_section_level = 0; | |
512 | t.base = base->mem_base; | |
346e4402 | 513 | #ifdef __ia64__ |
7f22442b | 514 | t.register_backing_store_base = base->reg-base; |
346e4402 | 515 | #endif |
7f22442b AW |
516 | t.continuation_root = SCM_EOL; |
517 | t.continuation_base = t.base; | |
518 | scm_i_pthread_cond_init (&t.sleep_cond, NULL); | |
519 | t.sleep_mutex = NULL; | |
520 | t.sleep_object = SCM_BOOL_F; | |
521 | t.sleep_fd = -1; | |
522 | ||
523 | if (pipe (t.sleep_pipe) != 0) | |
634aa8de LC |
524 | /* FIXME: Error conditions during the initialization phase are handled |
525 | gracelessly since public functions such as `scm_init_guile ()' | |
526 | currently have type `void'. */ | |
527 | abort (); | |
528 | ||
7f22442b AW |
529 | scm_i_pthread_mutex_init (&t.admin_mutex, NULL); |
530 | t.current_mark_stack_ptr = NULL; | |
531 | t.current_mark_stack_limit = NULL; | |
532 | t.canceled = 0; | |
533 | t.exited = 0; | |
534 | t.guile_mode = 0; | |
9de87eea | 535 | |
7f22442b AW |
536 | /* The switcheroo. */ |
537 | { | |
538 | scm_i_thread *t_ptr = &t; | |
539 | ||
540 | GC_disable (); | |
541 | t_ptr = GC_malloc (sizeof (scm_i_thread)); | |
542 | memcpy (t_ptr, &t, sizeof t); | |
543 | ||
544 | scm_i_pthread_setspecific (scm_i_thread_key, t_ptr); | |
f60a7648 AW |
545 | |
546 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
7f22442b AW |
547 | /* Cache the current thread in TLS for faster lookup. */ |
548 | scm_i_current_thread = t_ptr; | |
f60a7648 | 549 | #endif |
9de87eea | 550 | |
7f22442b AW |
551 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
552 | t_ptr->next_thread = all_threads; | |
553 | all_threads = t_ptr; | |
554 | thread_count++; | |
555 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
556 | ||
557 | GC_enable (); | |
558 | } | |
d823b11b MV |
559 | } |
560 | ||
9de87eea | 561 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 562 | */ |
9de87eea MV |
563 | static void |
564 | guilify_self_2 (SCM parent) | |
d823b11b | 565 | { |
9de87eea MV |
566 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
567 | ||
72e6b608 LC |
568 | t->guile_mode = 1; |
569 | ||
9de87eea | 570 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 571 | |
9de87eea MV |
572 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
573 | t->continuation_base = t->base; | |
2bbe1533 | 574 | t->vm = SCM_BOOL_F; |
9de87eea MV |
575 | |
576 | if (scm_is_true (parent)) | |
577 | t->dynamic_state = scm_make_dynamic_state (parent); | |
578 | else | |
579 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
580 | ||
581 | t->join_queue = make_queue (); | |
582 | t->block_asyncs = 0; | |
d823b11b MV |
583 | } |
584 | ||
6180e336 NJ |
585 | \f |
586 | /*** Fat mutexes */ | |
587 | ||
588 | /* We implement our own mutex type since we want them to be 'fair', we | |
589 | want to do fancy things while waiting for them (like running | |
590 | asyncs) and we might want to add things that are nice for | |
591 | debugging. | |
592 | */ | |
593 | ||
594 | typedef struct { | |
595 | scm_i_pthread_mutex_t lock; | |
596 | SCM owner; | |
adc085f1 | 597 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 598 | |
adc085f1 | 599 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
600 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
601 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
602 | owned by the current thread? */ | |
603 | ||
604 | SCM waiting; /* the threads waiting for this mutex. */ | |
605 | } fat_mutex; | |
606 | ||
607 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
608 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
609 | ||
2002f1f8 AW |
610 | static SCM |
611 | call_cleanup (void *data) | |
612 | { | |
613 | SCM *proc_p = data; | |
614 | return scm_call_0 (*proc_p); | |
615 | } | |
616 | ||
9de87eea | 617 | /* Perform thread tear-down, in guile mode. |
d823b11b | 618 | */ |
9de87eea MV |
619 | static void * |
620 | do_thread_exit (void *v) | |
621 | { | |
2e77f720 LC |
622 | scm_i_thread *t = (scm_i_thread *) v; |
623 | ||
91230883 LC |
624 | /* Ensure the signal handling thread has been launched, because we might be |
625 | shutting it down. This needs to be done in Guile mode. */ | |
626 | scm_i_ensure_signal_delivery_thread (); | |
627 | ||
2e77f720 LC |
628 | if (!scm_is_false (t->cleanup_handler)) |
629 | { | |
630 | SCM ptr = t->cleanup_handler; | |
631 | ||
632 | t->cleanup_handler = SCM_BOOL_F; | |
633 | t->result = scm_internal_catch (SCM_BOOL_T, | |
2002f1f8 | 634 | call_cleanup, &ptr, |
2e77f720 LC |
635 | scm_handle_by_message_noexit, NULL); |
636 | } | |
9de87eea | 637 | |
86a597f8 | 638 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
639 | |
640 | t->exited = 1; | |
0c97d7dd MV |
641 | close (t->sleep_pipe[0]); |
642 | close (t->sleep_pipe[1]); | |
9de87eea MV |
643 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
644 | ; | |
9de87eea | 645 | |
74926120 | 646 | while (!scm_is_null (t->mutexes)) |
6180e336 | 647 | { |
a0faf7dd | 648 | SCM mutex = SCM_WEAK_PAIR_CAR (t->mutexes); |
74926120 | 649 | |
a0faf7dd LC |
650 | if (!SCM_UNBNDP (mutex)) |
651 | { | |
652 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
653 | ||
654 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 LC |
655 | |
656 | /* Since MUTEX is in `t->mutexes', T must be its owner. */ | |
657 | assert (scm_is_eq (m->owner, t->handle)); | |
658 | ||
a0faf7dd | 659 | unblock_from_queue (m->waiting); |
f57fdf07 | 660 | |
a0faf7dd LC |
661 | scm_i_pthread_mutex_unlock (&m->lock); |
662 | } | |
6180e336 | 663 | |
a0faf7dd | 664 | t->mutexes = SCM_WEAK_PAIR_CDR (t->mutexes); |
6180e336 NJ |
665 | } |
666 | ||
86a597f8 | 667 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 668 | |
9de87eea MV |
669 | return NULL; |
670 | } | |
671 | ||
f60a7648 AW |
672 | static void * |
673 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
674 | { | |
7f22442b | 675 | /* Won't hurt if we are already registered. */ |
8e76ce94 | 676 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 677 | GC_register_my_thread (sb); |
8e76ce94 | 678 | #endif |
f60a7648 | 679 | |
7f22442b | 680 | return scm_with_guile (do_thread_exit, v); |
f60a7648 AW |
681 | } |
682 | ||
d823b11b | 683 | static void |
9de87eea | 684 | on_thread_exit (void *v) |
d823b11b | 685 | { |
29776e85 | 686 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 687 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 688 | |
d2a51087 NJ |
689 | /* If this thread was cancelled while doing a cond wait, it will |
690 | still have a mutex locked, so we unlock it here. */ | |
691 | if (t->held_mutex) | |
692 | { | |
693 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
694 | t->held_mutex = NULL; | |
695 | } | |
696 | ||
f60a7648 AW |
697 | /* Reinstate the current thread for purposes of scm_with_guile |
698 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
699 | case but it doesn't hurt to be consistent. */ | |
700 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 701 | |
7f22442b AW |
702 | /* Scheme-level thread finalizers and other cleanup needs to happen in |
703 | guile mode. */ | |
704 | GC_call_with_stack_base (do_thread_exit_trampoline, t); | |
0c97d7dd MV |
705 | |
706 | /* Removing ourself from the list of all threads needs to happen in | |
707 | non-guile mode since all SCM values on our stack become | |
29776e85 | 708 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
709 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
710 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
711 | if (*tp == t) | |
712 | { | |
713 | *tp = t->next_thread; | |
c058db8a LC |
714 | |
715 | /* GC-robust */ | |
716 | t->next_thread = NULL; | |
717 | ||
0c97d7dd MV |
718 | break; |
719 | } | |
720 | thread_count--; | |
2e77f720 LC |
721 | |
722 | /* If there's only one other thread, it could be the signal delivery | |
723 | thread, so we need to notify it to shut down by closing its read pipe. | |
724 | If it's not the signal delivery thread, then closing the read pipe isn't | |
725 | going to hurt. */ | |
726 | if (thread_count <= 1) | |
727 | scm_i_close_signal_pipe (); | |
728 | ||
0c97d7dd MV |
729 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
730 | ||
f60a7648 | 731 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
7f22442b | 732 | |
8e76ce94 | 733 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 734 | GC_unregister_my_thread (); |
653ccd78 | 735 | #endif |
d823b11b MV |
736 | } |
737 | ||
9de87eea | 738 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 739 | |
9de87eea MV |
740 | static void |
741 | init_thread_key (void) | |
742 | { | |
f60a7648 | 743 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 744 | } |
d823b11b | 745 | |
cde24ce1 AW |
746 | /* Perform any initializations necessary to make the current thread |
747 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
748 | if necessary. | |
a54a94b3 | 749 | |
9de87eea MV |
750 | BASE is the stack base to use with GC. |
751 | ||
752 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
753 | which case the default dynamic state is used. | |
754 | ||
cde24ce1 | 755 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 756 | return 1. |
cde24ce1 AW |
757 | |
758 | Note that it could be the case that the thread was known | |
759 | to Guile, but not in guile mode (because we are within a | |
760 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
761 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
762 | |
763 | static int | |
12c1d861 | 764 | scm_i_init_thread_for_guile (struct GC_stack_base *base, SCM parent) |
d823b11b | 765 | { |
9de87eea MV |
766 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
767 | ||
cde24ce1 AW |
768 | if (SCM_I_CURRENT_THREAD) |
769 | { | |
770 | /* Thread is already known to Guile. | |
771 | */ | |
772 | return 0; | |
773 | } | |
774 | else | |
9de87eea MV |
775 | { |
776 | /* This thread has not been guilified yet. | |
777 | */ | |
778 | ||
779 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
780 | if (scm_initialized_p == 0) | |
781 | { | |
782 | /* First thread ever to enter Guile. Run the full | |
783 | initialization. | |
784 | */ | |
785 | scm_i_init_guile (base); | |
12c1d861 | 786 | |
8e76ce94 | 787 | #if defined (HAVE_GC_ALLOW_REGISTER_THREADS) && SCM_USE_PTHREAD_THREADS |
12c1d861 AW |
788 | /* Allow other threads to come in later. */ |
789 | GC_allow_register_threads (); | |
4000d064 | 790 | #endif |
12c1d861 | 791 | |
9de87eea MV |
792 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); |
793 | } | |
794 | else | |
795 | { | |
796 | /* Guile is already initialized, but this thread enters it for | |
797 | the first time. Only initialize this thread. | |
798 | */ | |
799 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
12c1d861 AW |
800 | |
801 | /* Register this thread with libgc. */ | |
8e76ce94 | 802 | #if SCM_USE_PTHREAD_THREADS |
12c1d861 | 803 | GC_register_my_thread (base); |
8e76ce94 | 804 | #endif |
12c1d861 | 805 | |
9de87eea MV |
806 | guilify_self_1 (base); |
807 | guilify_self_2 (parent); | |
808 | } | |
809 | return 1; | |
810 | } | |
d823b11b MV |
811 | } |
812 | ||
12c1d861 AW |
813 | void |
814 | scm_init_guile () | |
d823b11b | 815 | { |
12c1d861 AW |
816 | struct GC_stack_base stack_base; |
817 | ||
818 | if (GC_get_stack_base (&stack_base) == GC_SUCCESS) | |
819 | scm_i_init_thread_for_guile (&stack_base, | |
820 | scm_i_default_dynamic_state); | |
9de87eea MV |
821 | else |
822 | { | |
12c1d861 AW |
823 | fprintf (stderr, "Failed to get stack base for current thread.\n"); |
824 | exit (1); | |
9de87eea | 825 | } |
a54a94b3 MV |
826 | } |
827 | ||
70eca635 | 828 | SCM_UNUSED static void |
2e77f720 LC |
829 | scm_leave_guile_cleanup (void *x) |
830 | { | |
47b6e9bd | 831 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
832 | } |
833 | ||
12c1d861 | 834 | struct with_guile_args |
cde24ce1 AW |
835 | { |
836 | GC_fn_type func; | |
837 | void *data; | |
12c1d861 | 838 | SCM parent; |
cde24ce1 AW |
839 | }; |
840 | ||
841 | static void * | |
842 | with_guile_trampoline (void *data) | |
843 | { | |
12c1d861 | 844 | struct with_guile_args *args = data; |
cde24ce1 AW |
845 | |
846 | return scm_c_with_continuation_barrier (args->func, args->data); | |
847 | } | |
848 | ||
12c1d861 AW |
849 | static void * |
850 | with_guile_and_parent (struct GC_stack_base *base, void *data) | |
9de87eea MV |
851 | { |
852 | void *res; | |
cde24ce1 AW |
853 | int new_thread; |
854 | scm_i_thread *t; | |
12c1d861 | 855 | struct with_guile_args *args = data; |
2e77f720 | 856 | |
12c1d861 | 857 | new_thread = scm_i_init_thread_for_guile (base, args->parent); |
cde24ce1 AW |
858 | t = SCM_I_CURRENT_THREAD; |
859 | if (new_thread) | |
2e77f720 | 860 | { |
cde24ce1 AW |
861 | /* We are in Guile mode. */ |
862 | assert (t->guile_mode); | |
863 | ||
12c1d861 | 864 | res = scm_c_with_continuation_barrier (args->func, args->data); |
cde24ce1 AW |
865 | |
866 | /* Leave Guile mode. */ | |
867 | t->guile_mode = 0; | |
868 | } | |
869 | else if (t->guile_mode) | |
870 | { | |
871 | /* Already in Guile mode. */ | |
12c1d861 | 872 | res = scm_c_with_continuation_barrier (args->func, args->data); |
2e77f720 | 873 | } |
74926120 | 874 | else |
cde24ce1 | 875 | { |
cde24ce1 AW |
876 | /* We are not in Guile mode, either because we are not within a |
877 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 878 | |
cde24ce1 AW |
879 | This call to scm_with_guile() could happen from anywhere on the |
880 | stack, and in particular lower on the stack than when it was | |
881 | when this thread was first guilified. Thus, `base' must be | |
882 | updated. */ | |
883 | #if SCM_STACK_GROWS_UP | |
12c1d861 AW |
884 | if (SCM_STACK_PTR (base->mem_base) < t->base) |
885 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 886 | #else |
12c1d861 AW |
887 | if (SCM_STACK_PTR (base->mem_base) > t->base) |
888 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 889 | #endif |
72e6b608 | 890 | |
cde24ce1 | 891 | t->guile_mode = 1; |
12c1d861 | 892 | res = with_gc_active (with_guile_trampoline, args); |
cde24ce1 AW |
893 | t->guile_mode = 0; |
894 | } | |
895 | return res; | |
72e6b608 | 896 | } |
3d1af79f | 897 | |
12c1d861 AW |
898 | static void * |
899 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) | |
900 | { | |
901 | struct with_guile_args args; | |
902 | ||
903 | args.func = func; | |
904 | args.data = data; | |
905 | args.parent = parent; | |
906 | ||
907 | return GC_call_with_stack_base (with_guile_and_parent, &args); | |
908 | } | |
909 | ||
910 | void * | |
911 | scm_with_guile (void *(*func)(void *), void *data) | |
912 | { | |
913 | return scm_i_with_guile_and_parent (func, data, | |
914 | scm_i_default_dynamic_state); | |
915 | } | |
916 | ||
9de87eea MV |
917 | void * |
918 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 919 | { |
72e6b608 | 920 | void *result; |
cde24ce1 | 921 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 922 | |
cde24ce1 | 923 | if (t->guile_mode) |
72e6b608 | 924 | { |
cde24ce1 AW |
925 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
926 | result = with_gc_inactive (func, data); | |
927 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
72e6b608 LC |
928 | } |
929 | else | |
cde24ce1 | 930 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
931 | result = func (data); |
932 | ||
933 | return result; | |
9de87eea MV |
934 | } |
935 | ||
72e6b608 | 936 | \f |
9de87eea MV |
937 | /*** Thread creation */ |
938 | ||
939 | typedef struct { | |
940 | SCM parent; | |
941 | SCM thunk; | |
942 | SCM handler; | |
76da80e7 | 943 | SCM thread; |
9de87eea MV |
944 | scm_i_pthread_mutex_t mutex; |
945 | scm_i_pthread_cond_t cond; | |
946 | } launch_data; | |
d823b11b | 947 | |
9de87eea MV |
948 | static void * |
949 | really_launch (void *d) | |
950 | { | |
951 | launch_data *data = (launch_data *)d; | |
952 | SCM thunk = data->thunk, handler = data->handler; | |
953 | scm_i_thread *t; | |
d823b11b | 954 | |
9de87eea | 955 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 956 | |
9de87eea MV |
957 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
958 | data->thread = scm_current_thread (); | |
959 | scm_i_pthread_cond_signal (&data->cond); | |
960 | scm_i_pthread_mutex_unlock (&data->mutex); | |
961 | ||
962 | if (SCM_UNBNDP (handler)) | |
963 | t->result = scm_call_0 (thunk); | |
964 | else | |
965 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
966 | ||
967 | return 0; | |
d823b11b MV |
968 | } |
969 | ||
9de87eea MV |
970 | static void * |
971 | launch_thread (void *d) | |
972 | { | |
973 | launch_data *data = (launch_data *)d; | |
974 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
975 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
976 | return NULL; | |
977 | } | |
978 | ||
979 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 980 | (SCM thunk, SCM handler), |
9de87eea MV |
981 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
982 | "returning a new thread object representing the thread. The procedure\n" | |
983 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
984 | "\n" | |
985 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
986 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
987 | "handler. This catch is established inside the continuation barrier.\n" | |
988 | "\n" | |
989 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
990 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
991 | #define FUNC_NAME s_scm_call_with_new_thread |
992 | { | |
9de87eea MV |
993 | launch_data data; |
994 | scm_i_pthread_t id; | |
995 | int err; | |
d823b11b | 996 | |
9de87eea MV |
997 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
998 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
999 | handler, SCM_ARG2, FUNC_NAME); | |
1000 | ||
1001 | data.parent = scm_current_dynamic_state (); | |
1002 | data.thunk = thunk; | |
1003 | data.handler = handler; | |
1004 | data.thread = SCM_BOOL_F; | |
1005 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1006 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1007 | ||
1008 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1009 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
1010 | if (err) | |
1011 | { | |
1012 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1013 | errno = err; | |
1014 | scm_syserror (NULL); | |
1015 | } | |
1016 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1017 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1018 | |
9de87eea | 1019 | return data.thread; |
d823b11b MV |
1020 | } |
1021 | #undef FUNC_NAME | |
1022 | ||
9de87eea MV |
1023 | typedef struct { |
1024 | SCM parent; | |
1025 | scm_t_catch_body body; | |
1026 | void *body_data; | |
1027 | scm_t_catch_handler handler; | |
1028 | void *handler_data; | |
1029 | SCM thread; | |
1030 | scm_i_pthread_mutex_t mutex; | |
1031 | scm_i_pthread_cond_t cond; | |
1032 | } spawn_data; | |
1033 | ||
1034 | static void * | |
1035 | really_spawn (void *d) | |
1036 | { | |
1037 | spawn_data *data = (spawn_data *)d; | |
1038 | scm_t_catch_body body = data->body; | |
1039 | void *body_data = data->body_data; | |
1040 | scm_t_catch_handler handler = data->handler; | |
1041 | void *handler_data = data->handler_data; | |
1042 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1043 | ||
1044 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1045 | data->thread = scm_current_thread (); | |
1046 | scm_i_pthread_cond_signal (&data->cond); | |
1047 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1048 | ||
1049 | if (handler == NULL) | |
1050 | t->result = body (body_data); | |
1051 | else | |
1052 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1053 | body, body_data, | |
1054 | handler, handler_data); | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | static void * | |
1060 | spawn_thread (void *d) | |
1061 | { | |
1062 | spawn_data *data = (spawn_data *)d; | |
1063 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1064 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1065 | return NULL; | |
1066 | } | |
1067 | ||
1068 | SCM | |
1069 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1070 | scm_t_catch_handler handler, void *handler_data) | |
1071 | { | |
1072 | spawn_data data; | |
1073 | scm_i_pthread_t id; | |
1074 | int err; | |
1075 | ||
1076 | data.parent = scm_current_dynamic_state (); | |
1077 | data.body = body; | |
1078 | data.body_data = body_data; | |
1079 | data.handler = handler; | |
1080 | data.handler_data = handler_data; | |
1081 | data.thread = SCM_BOOL_F; | |
1082 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1083 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1084 | ||
1085 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1086 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1087 | if (err) | |
1088 | { | |
1089 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1090 | errno = err; | |
1091 | scm_syserror (NULL); | |
1092 | } | |
1093 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1094 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1095 | |
9de87eea MV |
1096 | return data.thread; |
1097 | } | |
1098 | ||
29717c89 MD |
1099 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1100 | (), | |
1101 | "Move the calling thread to the end of the scheduling queue.") | |
1102 | #define FUNC_NAME s_scm_yield | |
1103 | { | |
9de87eea | 1104 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1105 | } |
1106 | #undef FUNC_NAME | |
1107 | ||
2e77f720 LC |
1108 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1109 | (SCM thread), | |
1110 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1111 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1112 | "been signaled to terminate, this function is a no-op.") | |
1113 | #define FUNC_NAME s_scm_cancel_thread | |
1114 | { | |
1115 | scm_i_thread *t = NULL; | |
1116 | ||
1117 | SCM_VALIDATE_THREAD (1, thread); | |
1118 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1119 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1120 | if (!t->canceled) |
1121 | { | |
1122 | t->canceled = 1; | |
86a597f8 | 1123 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1124 | scm_i_pthread_cancel (t->pthread); |
1125 | } | |
1126 | else | |
86a597f8 | 1127 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1128 | |
1129 | return SCM_UNSPECIFIED; | |
1130 | } | |
1131 | #undef FUNC_NAME | |
1132 | ||
1133 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1134 | (SCM thread, SCM proc), | |
1135 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1136 | "This handler will be called when the thread exits.") | |
1137 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1138 | { | |
1139 | scm_i_thread *t; | |
1140 | ||
1141 | SCM_VALIDATE_THREAD (1, thread); | |
1142 | if (!scm_is_false (proc)) | |
1143 | SCM_VALIDATE_THUNK (2, proc); | |
1144 | ||
2e77f720 | 1145 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1146 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1147 | ||
2e77f720 LC |
1148 | if (!(t->exited || t->canceled)) |
1149 | t->cleanup_handler = proc; | |
1150 | ||
86a597f8 | 1151 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1152 | |
1153 | return SCM_UNSPECIFIED; | |
1154 | } | |
1155 | #undef FUNC_NAME | |
1156 | ||
1157 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1158 | (SCM thread), | |
1159 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1160 | #define FUNC_NAME s_scm_thread_cleanup | |
1161 | { | |
1162 | scm_i_thread *t; | |
1163 | SCM ret; | |
1164 | ||
1165 | SCM_VALIDATE_THREAD (1, thread); | |
1166 | ||
2e77f720 | 1167 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1168 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1169 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1170 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1171 | |
1172 | return ret; | |
1173 | } | |
1174 | #undef FUNC_NAME | |
1175 | ||
6180e336 NJ |
1176 | SCM scm_join_thread (SCM thread) |
1177 | { | |
1178 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1179 | } | |
1180 | ||
1181 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1182 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1183 | "Suspend execution of the calling thread until the target @var{thread} " |
1184 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1185 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1186 | { |
9de87eea | 1187 | scm_i_thread *t; |
6180e336 NJ |
1188 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1189 | SCM res = SCM_BOOL_F; | |
1190 | ||
1191 | if (! (SCM_UNBNDP (timeoutval))) | |
1192 | res = timeoutval; | |
d823b11b MV |
1193 | |
1194 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1195 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1196 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1197 | |
9de87eea | 1198 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1199 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1200 | ||
6180e336 NJ |
1201 | if (! SCM_UNBNDP (timeout)) |
1202 | { | |
1203 | to_timespec (timeout, &ctimeout); | |
1204 | timeout_ptr = &ctimeout; | |
1205 | } | |
1206 | ||
1207 | if (t->exited) | |
1208 | res = t->result; | |
1209 | else | |
d823b11b | 1210 | { |
9de87eea MV |
1211 | while (1) |
1212 | { | |
74926120 | 1213 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1214 | timeout_ptr); |
1215 | if (err == 0) | |
1216 | { | |
1217 | if (t->exited) | |
1218 | { | |
1219 | res = t->result; | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | else if (err == ETIMEDOUT) | |
9de87eea | 1224 | break; |
6180e336 | 1225 | |
86a597f8 | 1226 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1227 | SCM_TICK; |
86a597f8 | 1228 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1229 | |
1230 | /* Check for exit again, since we just released and | |
1231 | reacquired the admin mutex, before the next block_self | |
1232 | call (which would block forever if t has already | |
1233 | exited). */ | |
1234 | if (t->exited) | |
1235 | { | |
1236 | res = t->result; | |
1237 | break; | |
1238 | } | |
9de87eea | 1239 | } |
d823b11b | 1240 | } |
9de87eea | 1241 | |
86a597f8 | 1242 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1243 | |
d823b11b | 1244 | return res; |
5f05c406 MV |
1245 | } |
1246 | #undef FUNC_NAME | |
1247 | ||
6180e336 NJ |
1248 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1249 | (SCM obj), | |
1250 | "Return @code{#t} if @var{obj} is a thread.") | |
1251 | #define FUNC_NAME s_scm_thread_p | |
1252 | { | |
1253 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1254 | } | |
1255 | #undef FUNC_NAME | |
5f05c406 | 1256 | |
4079f87e | 1257 | |
9de87eea MV |
1258 | static size_t |
1259 | fat_mutex_free (SCM mx) | |
76da80e7 | 1260 | { |
9de87eea MV |
1261 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1262 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1263 | return 0; |
1264 | } | |
1265 | ||
1266 | static int | |
9de87eea | 1267 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1268 | { |
9de87eea MV |
1269 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1270 | scm_puts ("#<mutex ", port); | |
1271 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1272 | scm_puts (">", port); | |
1273 | return 1; | |
76da80e7 MV |
1274 | } |
1275 | ||
76da80e7 | 1276 | static SCM |
6180e336 | 1277 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1278 | { |
9de87eea MV |
1279 | fat_mutex *m; |
1280 | SCM mx; | |
1281 | ||
1282 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1283 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1284 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1285 | m->level = 0; |
6180e336 | 1286 | |
adc085f1 | 1287 | m->recursive = recursive; |
6180e336 NJ |
1288 | m->unchecked_unlock = unchecked_unlock; |
1289 | m->allow_external_unlock = external_unlock; | |
1290 | ||
9de87eea MV |
1291 | m->waiting = SCM_EOL; |
1292 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1293 | m->waiting = make_queue (); | |
1294 | return mx; | |
76da80e7 MV |
1295 | } |
1296 | ||
6180e336 NJ |
1297 | SCM scm_make_mutex (void) |
1298 | { | |
1299 | return scm_make_mutex_with_flags (SCM_EOL); | |
1300 | } | |
1301 | ||
2a1d0688 NJ |
1302 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1303 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1304 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1305 | |
1306 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1307 | (SCM flags), | |
9de87eea | 1308 | "Create a new mutex. ") |
6180e336 | 1309 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1310 | { |
6180e336 NJ |
1311 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1312 | ||
1313 | SCM ptr = flags; | |
1314 | while (! scm_is_null (ptr)) | |
1315 | { | |
1316 | SCM flag = SCM_CAR (ptr); | |
1317 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1318 | unchecked_unlock = 1; | |
1319 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1320 | external_unlock = 1; | |
1321 | else if (scm_is_eq (flag, recursive_sym)) | |
1322 | recursive = 1; | |
74926120 | 1323 | else |
2a1d0688 | 1324 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1325 | ptr = SCM_CDR (ptr); |
1326 | } | |
1327 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1328 | } |
1329 | #undef FUNC_NAME | |
1330 | ||
9de87eea | 1331 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1332 | (void), |
9de87eea MV |
1333 | "Create a new recursive mutex. ") |
1334 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1335 | { |
6180e336 | 1336 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1337 | } |
1338 | #undef FUNC_NAME | |
1339 | ||
6180e336 NJ |
1340 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1341 | ||
1342 | static SCM | |
adc085f1 | 1343 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1344 | { |
1345 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1346 | |
adc085f1 | 1347 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1348 | SCM err = SCM_BOOL_F; |
1349 | ||
1350 | struct timeval current_time; | |
9de87eea MV |
1351 | |
1352 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1353 | |
1354 | while (1) | |
9de87eea | 1355 | { |
adc085f1 | 1356 | if (m->level == 0) |
6180e336 | 1357 | { |
adc085f1 | 1358 | m->owner = new_owner; |
6180e336 | 1359 | m->level++; |
74926120 | 1360 | |
adc085f1 | 1361 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1362 | { |
adc085f1 | 1363 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 | 1364 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1365 | |
1366 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1367 | retained when not referenced elsewhere (bug #27450). |
1368 | The weak pair itself is eventually removed when MUTEX | |
1369 | is unlocked. Note that `t->mutexes' lists mutexes | |
1370 | currently held by T, so it should be small. */ | |
a0faf7dd LC |
1371 | t->mutexes = scm_weak_car_pair (mutex, t->mutexes); |
1372 | ||
6180e336 | 1373 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1374 | } |
adc085f1 JG |
1375 | *ret = 1; |
1376 | break; | |
1377 | } | |
1378 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1379 | { | |
1380 | m->owner = new_owner; | |
1381 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1382 | scm_from_locale_string ("lock obtained on abandoned " | |
1383 | "mutex")); | |
1384 | *ret = 1; | |
1385 | break; | |
1386 | } | |
1387 | else if (scm_is_eq (m->owner, new_owner)) | |
1388 | { | |
1389 | if (m->recursive) | |
1390 | { | |
1391 | m->level++; | |
74926120 | 1392 | *ret = 1; |
adc085f1 JG |
1393 | } |
1394 | else | |
6180e336 | 1395 | { |
adc085f1 JG |
1396 | err = scm_cons (scm_misc_error_key, |
1397 | scm_from_locale_string ("mutex already locked " | |
1398 | "by thread")); | |
1399 | *ret = 0; | |
1400 | } | |
74926120 | 1401 | break; |
adc085f1 | 1402 | } |
9de87eea | 1403 | else |
9de87eea | 1404 | { |
74926120 | 1405 | if (timeout != NULL) |
adc085f1 JG |
1406 | { |
1407 | gettimeofday (¤t_time, NULL); | |
1408 | if (current_time.tv_sec > timeout->tv_sec || | |
1409 | (current_time.tv_sec == timeout->tv_sec && | |
1410 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1411 | { |
adc085f1 JG |
1412 | *ret = 0; |
1413 | break; | |
6180e336 | 1414 | } |
6180e336 | 1415 | } |
37a52039 | 1416 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1417 | scm_i_pthread_mutex_unlock (&m->lock); |
1418 | SCM_TICK; | |
1419 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1420 | } | |
1421 | } | |
1422 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1423 | return err; |
9de87eea MV |
1424 | } |
1425 | ||
6180e336 NJ |
1426 | SCM scm_lock_mutex (SCM mx) |
1427 | { | |
adc085f1 | 1428 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1429 | } |
1430 | ||
adc085f1 JG |
1431 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1432 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1433 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1434 | "blocks until the mutex becomes available. The function returns when " | |
1435 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1436 | "a thread already owns will succeed right away and will not block the " | |
1437 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1438 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1439 | { |
6180e336 NJ |
1440 | SCM exception; |
1441 | int ret = 0; | |
1442 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1443 | |
6180e336 NJ |
1444 | SCM_VALIDATE_MUTEX (1, m); |
1445 | ||
1446 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1447 | { | |
1448 | to_timespec (timeout, &cwaittime); | |
1449 | waittime = &cwaittime; | |
1450 | } | |
1451 | ||
adc085f1 | 1452 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1453 | if (!scm_is_false (exception)) |
1454 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1455 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1456 | } |
76da80e7 | 1457 | #undef FUNC_NAME |
9bc4701c | 1458 | |
2a3db25e MW |
1459 | static void |
1460 | lock_mutex_return_void (SCM mx) | |
1461 | { | |
1462 | (void) scm_lock_mutex (mx); | |
1463 | } | |
1464 | ||
1465 | static void | |
1466 | unlock_mutex_return_void (SCM mx) | |
1467 | { | |
1468 | (void) scm_unlock_mutex (mx); | |
1469 | } | |
1470 | ||
a4d106c7 | 1471 | void |
661ae7ab | 1472 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1473 | { |
2a3db25e | 1474 | scm_dynwind_unwind_handler_with_scm (unlock_mutex_return_void, mutex, |
661ae7ab | 1475 | SCM_F_WIND_EXPLICITLY); |
2a3db25e | 1476 | scm_dynwind_rewind_handler_with_scm (lock_mutex_return_void, mutex, |
661ae7ab | 1477 | SCM_F_WIND_EXPLICITLY); |
a4d106c7 MV |
1478 | } |
1479 | ||
9bc4701c | 1480 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1481 | (SCM mutex), |
9bc4701c MD |
1482 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1483 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1484 | #define FUNC_NAME s_scm_try_mutex | |
1485 | { | |
6180e336 NJ |
1486 | SCM exception; |
1487 | int ret = 0; | |
1488 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1489 | |
ba1b7223 | 1490 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1491 | |
1492 | to_timespec (scm_from_int(0), &cwaittime); | |
1493 | waittime = &cwaittime; | |
74926120 | 1494 | |
adc085f1 | 1495 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &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; | |
9de87eea MV |
1499 | } |
1500 | #undef FUNC_NAME | |
76da80e7 | 1501 | |
6180e336 NJ |
1502 | /*** Fat condition variables */ |
1503 | ||
1504 | typedef struct { | |
1505 | scm_i_pthread_mutex_t lock; | |
1506 | SCM waiting; /* the threads waiting for this condition. */ | |
1507 | } fat_cond; | |
1508 | ||
1509 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1510 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1511 | ||
1512 | static int | |
1513 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1514 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1515 | { |
7f991c7d | 1516 | SCM owner; |
6180e336 NJ |
1517 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1518 | fat_cond *c = NULL; | |
1519 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1520 | int err = 0, ret = 0; | |
9de87eea MV |
1521 | |
1522 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1523 | |
7f991c7d | 1524 | owner = m->owner; |
adc085f1 | 1525 | |
d31ae2c3 | 1526 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1527 | { |
adc085f1 | 1528 | if (m->level == 0) |
6180e336 NJ |
1529 | { |
1530 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1531 | { |
1532 | scm_i_pthread_mutex_unlock (&m->lock); | |
1533 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1534 | } | |
d31ae2c3 | 1535 | owner = t->handle; |
6180e336 NJ |
1536 | } |
1537 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1538 | { |
1539 | scm_i_pthread_mutex_unlock (&m->lock); | |
1540 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1541 | } | |
6180e336 NJ |
1542 | } |
1543 | ||
1544 | if (! (SCM_UNBNDP (cond))) | |
1545 | { | |
6180e336 NJ |
1546 | c = SCM_CONDVAR_DATA (cond); |
1547 | while (1) | |
1548 | { | |
1549 | int brk = 0; | |
1550 | ||
6180e336 NJ |
1551 | if (m->level > 0) |
1552 | m->level--; | |
adc085f1 | 1553 | if (m->level == 0) |
f57fdf07 LC |
1554 | { |
1555 | /* Change the owner of MUTEX. */ | |
1556 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1557 | m->owner = unblock_from_queue (m->waiting); | |
1558 | } | |
adc085f1 | 1559 | |
6180e336 | 1560 | t->block_asyncs++; |
74926120 | 1561 | |
d2a51087 NJ |
1562 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1563 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1564 | |
1565 | if (err == 0) | |
1566 | { | |
1567 | ret = 1; | |
1568 | brk = 1; | |
1569 | } | |
1570 | else if (err == ETIMEDOUT) | |
1571 | { | |
1572 | ret = 0; | |
1573 | brk = 1; | |
1574 | } | |
1575 | else if (err != EINTR) | |
74926120 | 1576 | { |
6180e336 | 1577 | errno = err; |
6180e336 | 1578 | scm_syserror (NULL); |
74926120 | 1579 | } |
6180e336 NJ |
1580 | |
1581 | if (brk) | |
1582 | { | |
1583 | if (relock) | |
adc085f1 | 1584 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1585 | t->block_asyncs--; |
6180e336 NJ |
1586 | break; |
1587 | } | |
74926120 | 1588 | |
6180e336 NJ |
1589 | t->block_asyncs--; |
1590 | scm_async_click (); | |
74926120 | 1591 | |
6180e336 NJ |
1592 | scm_remember_upto_here_2 (cond, mutex); |
1593 | ||
1594 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1595 | } | |
9bc4701c | 1596 | } |
9de87eea | 1597 | else |
6180e336 NJ |
1598 | { |
1599 | if (m->level > 0) | |
1600 | m->level--; | |
74926120 | 1601 | if (m->level == 0) |
f57fdf07 LC |
1602 | { |
1603 | /* Change the owner of MUTEX. */ | |
1604 | t->mutexes = scm_delq_x (mutex, t->mutexes); | |
1605 | m->owner = unblock_from_queue (m->waiting); | |
1606 | } | |
74926120 | 1607 | |
6180e336 NJ |
1608 | scm_i_pthread_mutex_unlock (&m->lock); |
1609 | ret = 1; | |
1610 | } | |
9de87eea | 1611 | |
6180e336 | 1612 | return ret; |
9bc4701c | 1613 | } |
9bc4701c | 1614 | |
6180e336 NJ |
1615 | SCM scm_unlock_mutex (SCM mx) |
1616 | { | |
1617 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1618 | } |
9bc4701c | 1619 | |
6180e336 NJ |
1620 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1621 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1622 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1623 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1624 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1625 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1626 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1627 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1628 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1629 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1630 | { |
6180e336 NJ |
1631 | scm_t_timespec cwaittime, *waittime = NULL; |
1632 | ||
9bc4701c | 1633 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1634 | if (! (SCM_UNBNDP (cond))) |
1635 | { | |
1636 | SCM_VALIDATE_CONDVAR (2, cond); | |
1637 | ||
1638 | if (! (SCM_UNBNDP (timeout))) | |
1639 | { | |
1640 | to_timespec (timeout, &cwaittime); | |
1641 | waittime = &cwaittime; | |
1642 | } | |
1643 | } | |
1644 | ||
1645 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1646 | } |
1647 | #undef FUNC_NAME | |
1648 | ||
6180e336 NJ |
1649 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1650 | (SCM obj), | |
1651 | "Return @code{#t} if @var{obj} is a mutex.") | |
1652 | #define FUNC_NAME s_scm_mutex_p | |
1653 | { | |
1654 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1655 | } | |
74926120 | 1656 | #undef FUNC_NAME |
9de87eea MV |
1657 | |
1658 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1659 | (SCM mx), | |
1660 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1661 | #define FUNC_NAME s_scm_mutex_owner | |
1662 | { | |
adc085f1 JG |
1663 | SCM owner; |
1664 | fat_mutex *m = NULL; | |
1665 | ||
9de87eea | 1666 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1667 | m = SCM_MUTEX_DATA (mx); |
1668 | scm_i_pthread_mutex_lock (&m->lock); | |
1669 | owner = m->owner; | |
1670 | scm_i_pthread_mutex_unlock (&m->lock); | |
1671 | ||
1672 | return owner; | |
9de87eea MV |
1673 | } |
1674 | #undef FUNC_NAME | |
1675 | ||
1676 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1677 | (SCM mx), | |
adc085f1 | 1678 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1679 | #define FUNC_NAME s_scm_mutex_level |
1680 | { | |
1681 | SCM_VALIDATE_MUTEX (1, mx); | |
1682 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1683 | } | |
1684 | #undef FUNC_NAME | |
1685 | ||
adc085f1 JG |
1686 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1687 | (SCM mx), | |
1688 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1689 | #define FUNC_NAME s_scm_mutex_locked_p | |
1690 | { | |
1691 | SCM_VALIDATE_MUTEX (1, mx); | |
1692 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1693 | } | |
1694 | #undef FUNC_NAME | |
9de87eea | 1695 | |
9de87eea MV |
1696 | static int |
1697 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1698 | { | |
1699 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1700 | scm_puts ("#<condition-variable ", port); | |
1701 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1702 | scm_puts (">", port); | |
1703 | return 1; | |
1704 | } | |
9bc4701c | 1705 | |
d823b11b MV |
1706 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1707 | (void), | |
1708 | "Make a new condition variable.") | |
1709 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1710 | { |
9de87eea MV |
1711 | fat_cond *c; |
1712 | SCM cv; | |
1713 | ||
1714 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1715 | c->waiting = SCM_EOL; |
1716 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1717 | c->waiting = make_queue (); | |
d823b11b | 1718 | return cv; |
5f05c406 | 1719 | } |
d823b11b | 1720 | #undef FUNC_NAME |
5f05c406 | 1721 | |
d823b11b MV |
1722 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1723 | (SCM cv, SCM mx, SCM t), | |
1724 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1725 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1726 | "is locked again when this function returns. When @var{time} is given, " | |
1727 | "it specifies a point in time where the waiting should be aborted. It " | |
1728 | "can be either a integer as returned by @code{current-time} or a pair " | |
1729 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1730 | "mutex is locked and @code{#f} is returned. When the condition " | |
1731 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1732 | "is returned. ") | |
1733 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1734 | { |
9de87eea | 1735 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1736 | |
1737 | SCM_VALIDATE_CONDVAR (1, cv); | |
1738 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1739 | |
d823b11b MV |
1740 | if (!SCM_UNBNDP (t)) |
1741 | { | |
6180e336 | 1742 | to_timespec (t, &waittime); |
9de87eea | 1743 | waitptr = &waittime; |
d823b11b MV |
1744 | } |
1745 | ||
2a1d0688 | 1746 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1747 | } |
d823b11b | 1748 | #undef FUNC_NAME |
5f05c406 | 1749 | |
9de87eea MV |
1750 | static void |
1751 | fat_cond_signal (fat_cond *c) | |
1752 | { | |
9de87eea | 1753 | unblock_from_queue (c->waiting); |
9de87eea MV |
1754 | } |
1755 | ||
d823b11b MV |
1756 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1757 | (SCM cv), | |
1758 | "Wake up one thread that is waiting for @var{cv}") | |
1759 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1760 | { |
d823b11b | 1761 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1762 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1763 | return SCM_BOOL_T; |
5f05c406 | 1764 | } |
d823b11b | 1765 | #undef FUNC_NAME |
5f05c406 | 1766 | |
9de87eea MV |
1767 | static void |
1768 | fat_cond_broadcast (fat_cond *c) | |
1769 | { | |
9de87eea MV |
1770 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1771 | ; | |
9de87eea MV |
1772 | } |
1773 | ||
d823b11b MV |
1774 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1775 | (SCM cv), | |
1776 | "Wake up all threads that are waiting for @var{cv}. ") | |
1777 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1778 | { |
d823b11b | 1779 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1780 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1781 | return SCM_BOOL_T; |
5f05c406 | 1782 | } |
d823b11b | 1783 | #undef FUNC_NAME |
5f05c406 | 1784 | |
6180e336 NJ |
1785 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1786 | (SCM obj), | |
1787 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1788 | #define FUNC_NAME s_scm_condition_variable_p | |
1789 | { | |
1790 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1791 | } | |
1792 | #undef FUNC_NAME | |
1793 | ||
6087fad9 | 1794 | |
8c2b3143 | 1795 | \f |
d823b11b MV |
1796 | /*** Select */ |
1797 | ||
8c2b3143 LC |
1798 | struct select_args |
1799 | { | |
1800 | int nfds; | |
1801 | SELECT_TYPE *read_fds; | |
1802 | SELECT_TYPE *write_fds; | |
1803 | SELECT_TYPE *except_fds; | |
1804 | struct timeval *timeout; | |
1805 | ||
1806 | int result; | |
1807 | int errno_value; | |
1808 | }; | |
1809 | ||
1810 | static void * | |
1811 | do_std_select (void *args) | |
1812 | { | |
1813 | struct select_args *select_args; | |
1814 | ||
1815 | select_args = (struct select_args *) args; | |
1816 | ||
1817 | select_args->result = | |
1818 | select (select_args->nfds, | |
1819 | select_args->read_fds, select_args->write_fds, | |
1820 | select_args->except_fds, select_args->timeout); | |
1821 | select_args->errno_value = errno; | |
1822 | ||
1823 | return NULL; | |
1824 | } | |
1825 | ||
911782b7 | 1826 | int |
9de87eea MV |
1827 | scm_std_select (int nfds, |
1828 | SELECT_TYPE *readfds, | |
1829 | SELECT_TYPE *writefds, | |
1830 | SELECT_TYPE *exceptfds, | |
1831 | struct timeval *timeout) | |
1832 | { | |
1833 | fd_set my_readfds; | |
1834 | int res, eno, wakeup_fd; | |
1835 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1836 | struct select_args args; |
9de87eea MV |
1837 | |
1838 | if (readfds == NULL) | |
1839 | { | |
1840 | FD_ZERO (&my_readfds); | |
1841 | readfds = &my_readfds; | |
1842 | } | |
1843 | ||
1844 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1845 | SCM_TICK; | |
1846 | ||
1847 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1848 | FD_SET (wakeup_fd, readfds); |
1849 | if (wakeup_fd >= nfds) | |
1850 | nfds = wakeup_fd+1; | |
9de87eea | 1851 | |
8c2b3143 LC |
1852 | args.nfds = nfds; |
1853 | args.read_fds = readfds; | |
1854 | args.write_fds = writefds; | |
1855 | args.except_fds = exceptfds; | |
1856 | args.timeout = timeout; | |
1857 | ||
1858 | /* Explicitly cooperate with the GC. */ | |
1859 | scm_without_guile (do_std_select, &args); | |
1860 | ||
1861 | res = args.result; | |
1862 | eno = args.errno_value; | |
1863 | ||
1864 | t->sleep_fd = -1; | |
9de87eea MV |
1865 | scm_i_reset_sleep (t); |
1866 | ||
1867 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1868 | { | |
1869 | char dummy; | |
634aa8de LC |
1870 | full_read (wakeup_fd, &dummy, 1); |
1871 | ||
9de87eea MV |
1872 | FD_CLR (wakeup_fd, readfds); |
1873 | res -= 1; | |
1874 | if (res == 0) | |
1875 | { | |
1876 | eno = EINTR; | |
1877 | res = -1; | |
1878 | } | |
1879 | } | |
d823b11b MV |
1880 | errno = eno; |
1881 | return res; | |
5f05c406 MV |
1882 | } |
1883 | ||
9de87eea | 1884 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1885 | |
9de87eea | 1886 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1887 | |
2956b071 LC |
1888 | /* It seems reasonable to not run procedures related to mutex and condition |
1889 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1890 | without it, and (ii) the only potential gain would be GC latency. See | |
1891 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1892 | for a discussion of the pros and cons. */ | |
1893 | ||
9bc4701c | 1894 | int |
9de87eea | 1895 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1896 | { |
9de87eea | 1897 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1898 | return res; |
1899 | } | |
1900 | ||
9de87eea | 1901 | static void |
2b829bbb | 1902 | do_unlock (void *data) |
28d52ebb | 1903 | { |
9de87eea | 1904 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1905 | } |
1906 | ||
1907 | void | |
661ae7ab | 1908 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1909 | { |
9de87eea | 1910 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1911 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1912 | } |
1913 | ||
9bc4701c | 1914 | int |
9de87eea | 1915 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1916 | { |
4cf72f0b LC |
1917 | int res; |
1918 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1919 | ||
1920 | t->held_mutex = mutex; | |
1921 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1922 | t->held_mutex = NULL; | |
1923 | ||
9bc4701c MD |
1924 | return res; |
1925 | } | |
9bc4701c | 1926 | |
76da80e7 | 1927 | int |
9de87eea MV |
1928 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1929 | scm_i_pthread_mutex_t *mutex, | |
1930 | const scm_t_timespec *wt) | |
76da80e7 | 1931 | { |
4cf72f0b LC |
1932 | int res; |
1933 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1934 | ||
1935 | t->held_mutex = mutex; | |
1936 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1937 | t->held_mutex = NULL; | |
1938 | ||
9de87eea | 1939 | return res; |
76da80e7 MV |
1940 | } |
1941 | ||
9de87eea | 1942 | #endif |
76da80e7 | 1943 | |
d823b11b | 1944 | unsigned long |
9de87eea | 1945 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1946 | { |
d823b11b MV |
1947 | struct timeval tv; |
1948 | tv.tv_usec = usecs % 1000000; | |
1949 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1950 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1951 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1952 | } |
1953 | ||
9de87eea MV |
1954 | unsigned int |
1955 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1956 | { |
d823b11b MV |
1957 | struct timeval tv; |
1958 | tv.tv_usec = 0; | |
1959 | tv.tv_sec = secs; | |
9de87eea | 1960 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1961 | return tv.tv_sec; |
6c214b62 MD |
1962 | } |
1963 | ||
d823b11b MV |
1964 | /*** Misc */ |
1965 | ||
1966 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1967 | (void), | |
1968 | "Return the thread that called this function.") | |
1969 | #define FUNC_NAME s_scm_current_thread | |
1970 | { | |
9de87eea | 1971 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1972 | } |
1973 | #undef FUNC_NAME | |
1974 | ||
9de87eea MV |
1975 | static SCM |
1976 | scm_c_make_list (size_t n, SCM fill) | |
1977 | { | |
1978 | SCM res = SCM_EOL; | |
1979 | while (n-- > 0) | |
1980 | res = scm_cons (fill, res); | |
1981 | return res; | |
1982 | } | |
1983 | ||
d823b11b MV |
1984 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1985 | (void), | |
1986 | "Return a list of all threads.") | |
9bc4701c | 1987 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1988 | { |
9de87eea MV |
1989 | /* We can not allocate while holding the thread_admin_mutex because |
1990 | of the way GC is done. | |
1991 | */ | |
1992 | int n = thread_count; | |
1993 | scm_i_thread *t; | |
1994 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1995 | |
9de87eea MV |
1996 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1997 | l = &list; | |
1998 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1999 | { | |
2e77f720 LC |
2000 | if (t != scm_i_signal_delivery_thread) |
2001 | { | |
2002 | SCM_SETCAR (*l, t->handle); | |
2003 | l = SCM_CDRLOC (*l); | |
2004 | } | |
9de87eea MV |
2005 | n--; |
2006 | } | |
2007 | *l = SCM_EOL; | |
2008 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
2009 | return list; | |
d823b11b | 2010 | } |
9de87eea | 2011 | #undef FUNC_NAME |
d823b11b MV |
2012 | |
2013 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
2014 | (SCM thread), | |
2015 | "Return @code{#t} iff @var{thread} has exited.\n") | |
2016 | #define FUNC_NAME s_scm_thread_exited_p | |
2017 | { | |
7888309b | 2018 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
2019 | } |
2020 | #undef FUNC_NAME | |
2021 | ||
911782b7 | 2022 | int |
d823b11b MV |
2023 | scm_c_thread_exited_p (SCM thread) |
2024 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 2025 | { |
9de87eea | 2026 | scm_i_thread *t; |
d823b11b | 2027 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 2028 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 2029 | return t->exited; |
5f05c406 | 2030 | } |
d823b11b | 2031 | #undef FUNC_NAME |
5f05c406 | 2032 | |
d20912e6 LC |
2033 | SCM_DEFINE (scm_total_processor_count, "total-processor-count", 0, 0, 0, |
2034 | (void), | |
2035 | "Return the total number of processors of the machine, which\n" | |
2036 | "is guaranteed to be at least 1. A ``processor'' here is a\n" | |
2037 | "thread execution unit, which can be either:\n\n" | |
2038 | "@itemize\n" | |
2039 | "@item an execution core in a (possibly multi-core) chip, in a\n" | |
2040 | " (possibly multi- chip) module, in a single computer, or\n" | |
2041 | "@item a thread execution unit inside a core in the case of\n" | |
2042 | " @dfn{hyper-threaded} CPUs.\n" | |
2043 | "@end itemize\n\n" | |
2044 | "Which of the two definitions is used, is unspecified.\n") | |
2045 | #define FUNC_NAME s_scm_total_processor_count | |
2046 | { | |
2047 | return scm_from_ulong (num_processors (NPROC_ALL)); | |
2048 | } | |
2049 | #undef FUNC_NAME | |
2050 | ||
2051 | SCM_DEFINE (scm_current_processor_count, "current-processor-count", 0, 0, 0, | |
2052 | (void), | |
2053 | "Like @code{total-processor-count}, but return the number of\n" | |
2054 | "processors available to the current process. See\n" | |
2055 | "@code{setaffinity} and @code{getaffinity} for more\n" | |
2056 | "information.\n") | |
2057 | #define FUNC_NAME s_scm_current_processor_count | |
2058 | { | |
2059 | return scm_from_ulong (num_processors (NPROC_CURRENT)); | |
2060 | } | |
2061 | #undef FUNC_NAME | |
2062 | ||
2063 | ||
2064 | \f | |
2065 | ||
9de87eea | 2066 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
2067 | static int threads_initialized_p = 0; |
2068 | ||
9bc4701c | 2069 | |
a4d106c7 MV |
2070 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2071 | */ | |
d1138028 | 2072 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 2073 | |
661ae7ab | 2074 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2075 | |
9bc4701c | 2076 | void |
661ae7ab | 2077 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2078 | { |
a4d106c7 | 2079 | if (scm_is_false (mutex)) |
661ae7ab MV |
2080 | mutex = dynwind_critical_section_mutex; |
2081 | scm_dynwind_lock_mutex (mutex); | |
2082 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2083 | } |
2084 | ||
2085 | /*** Initialization */ | |
2086 | ||
9de87eea MV |
2087 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2088 | ||
d1138028 MV |
2089 | #if SCM_USE_PTHREAD_THREADS |
2090 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2091 | #endif | |
2092 | ||
9de87eea | 2093 | void |
12c1d861 | 2094 | scm_threads_prehistory (void *base) |
9de87eea | 2095 | { |
d1138028 MV |
2096 | #if SCM_USE_PTHREAD_THREADS |
2097 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2098 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2099 | PTHREAD_MUTEX_RECURSIVE); | |
2100 | #endif | |
2101 | ||
2102 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2103 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2104 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2105 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2106 | |
12c1d861 | 2107 | guilify_self_1 ((struct GC_stack_base *) base); |
9bc4701c MD |
2108 | } |
2109 | ||
d823b11b MV |
2110 | scm_t_bits scm_tc16_thread; |
2111 | scm_t_bits scm_tc16_mutex; | |
2112 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2113 | |
7bfd3b9e | 2114 | void |
9de87eea | 2115 | scm_init_threads () |
7bfd3b9e | 2116 | { |
9de87eea | 2117 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2118 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2119 | |
9de87eea | 2120 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2121 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2122 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2123 | |
9de87eea MV |
2124 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2125 | sizeof (fat_cond)); | |
9de87eea | 2126 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2127 | |
9de87eea MV |
2128 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2129 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2130 | threads_initialized_p = 1; |
a4d106c7 | 2131 | |
f39448c5 | 2132 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2133 | } |
89e00824 | 2134 | |
5f05c406 | 2135 | void |
9de87eea | 2136 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2137 | { |
9de87eea | 2138 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2139 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2140 | } |
2141 | ||
d823b11b | 2142 | void |
9de87eea | 2143 | scm_init_thread_procs () |
d823b11b | 2144 | { |
9de87eea | 2145 | #include "libguile/threads.x" |
d823b11b MV |
2146 | } |
2147 | ||
3c13664e LC |
2148 | \f |
2149 | /* IA64-specific things. */ | |
2150 | ||
2151 | #ifdef __ia64__ | |
2152 | # ifdef __hpux | |
2153 | # include <sys/param.h> | |
2154 | # include <sys/pstat.h> | |
2155 | void * | |
2156 | scm_ia64_register_backing_store_base (void) | |
2157 | { | |
2158 | struct pst_vm_status vm_status; | |
2159 | int i = 0; | |
2160 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2161 | if (vm_status.pst_type == PS_RSESTACK) | |
2162 | return (void *) vm_status.pst_vaddr; | |
2163 | abort (); | |
2164 | } | |
2165 | void * | |
2166 | scm_ia64_ar_bsp (const void *ctx) | |
2167 | { | |
2168 | uint64_t bsp; | |
2169 | __uc_get_ar_bsp (ctx, &bsp); | |
2170 | return (void *) bsp; | |
2171 | } | |
2172 | # endif /* hpux */ | |
2173 | # ifdef linux | |
2174 | # include <ucontext.h> | |
2175 | void * | |
2176 | scm_ia64_register_backing_store_base (void) | |
2177 | { | |
2178 | extern void *__libc_ia64_register_backing_store_base; | |
2179 | return __libc_ia64_register_backing_store_base; | |
2180 | } | |
2181 | void * | |
2182 | scm_ia64_ar_bsp (const void *opaque) | |
2183 | { | |
2184 | const ucontext_t *ctx = opaque; | |
2185 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2186 | } | |
2187 | # endif /* linux */ | |
2188 | #endif /* __ia64__ */ | |
2189 | ||
2190 | ||
89e00824 ML |
2191 | /* |
2192 | Local Variables: | |
2193 | c-file-style: "gnu" | |
2194 | End: | |
2195 | */ |