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> |
32f94bf2 | 42 | #include <fcntl.h> |
d20912e6 | 43 | #include <nproc.h> |
f57fdf07 | 44 | |
d823b11b MV |
45 | #include "libguile/validate.h" |
46 | #include "libguile/root.h" | |
47 | #include "libguile/eval.h" | |
48 | #include "libguile/async.h" | |
49 | #include "libguile/ports.h" | |
50 | #include "libguile/threads.h" | |
a0599745 | 51 | #include "libguile/dynwind.h" |
d823b11b | 52 | #include "libguile/iselect.h" |
9de87eea MV |
53 | #include "libguile/fluids.h" |
54 | #include "libguile/continuations.h" | |
2b829bbb | 55 | #include "libguile/gc.h" |
9de87eea | 56 | #include "libguile/init.h" |
2e77f720 | 57 | #include "libguile/scmsigs.h" |
6180e336 | 58 | #include "libguile/strings.h" |
7bfd3b9e | 59 | |
634aa8de LC |
60 | #include <full-read.h> |
61 | ||
cde24ce1 AW |
62 | |
63 | \f | |
64 | ||
65 | /* First some libgc shims. */ | |
66 | ||
67 | /* Make sure GC_fn_type is defined; it is missing from the public | |
68 | headers of GC 7.1 and earlier. */ | |
69 | #ifndef HAVE_GC_FN_TYPE | |
70 | typedef void * (* GC_fn_type) (void *); | |
71 | #endif | |
72 | ||
73 | ||
5f0d2951 AW |
74 | #ifndef GC_SUCCESS |
75 | #define GC_SUCCESS 0 | |
76 | #endif | |
77 | ||
78 | #ifndef GC_UNIMPLEMENTED | |
79 | #define GC_UNIMPLEMENTED 3 | |
80 | #endif | |
81 | ||
82 | /* Likewise struct GC_stack_base is missing before 7.1. */ | |
83 | #ifndef HAVE_GC_STACK_BASE | |
12c1d861 AW |
84 | struct GC_stack_base { |
85 | void * mem_base; /* Base of memory stack. */ | |
86 | #ifdef __ia64__ | |
87 | void * reg_base; /* Base of separate register stack. */ | |
88 | #endif | |
89 | }; | |
5f0d2951 AW |
90 | |
91 | static int | |
987b8160 | 92 | GC_register_my_thread (struct GC_stack_base *stack_base) |
5f0d2951 AW |
93 | { |
94 | return GC_UNIMPLEMENTED; | |
95 | } | |
96 | ||
97 | static void | |
98 | GC_unregister_my_thread () | |
99 | { | |
100 | } | |
101 | ||
12c1d861 AW |
102 | #if !SCM_USE_PTHREAD_THREADS |
103 | /* No threads; we can just use GC_stackbottom. */ | |
5f0d2951 | 104 | static void * |
12c1d861 AW |
105 | get_thread_stack_base () |
106 | { | |
107 | return GC_stackbottom; | |
108 | } | |
109 | ||
110 | #elif defined HAVE_PTHREAD_ATTR_GETSTACK && defined HAVE_PTHREAD_GETATTR_NP \ | |
111 | && defined PTHREAD_ATTR_GETSTACK_WORKS | |
112 | /* This method for GNU/Linux and perhaps some other systems. | |
113 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
114 | available on them. */ | |
115 | static void * | |
116 | get_thread_stack_base () | |
117 | { | |
118 | pthread_attr_t attr; | |
119 | void *start, *end; | |
120 | size_t size; | |
121 | ||
122 | pthread_getattr_np (pthread_self (), &attr); | |
123 | pthread_attr_getstack (&attr, &start, &size); | |
124 | end = (char *)start + size; | |
125 | ||
126 | #if SCM_STACK_GROWS_UP | |
127 | return start; | |
128 | #else | |
129 | return end; | |
130 | #endif | |
131 | } | |
132 | ||
133 | #elif defined HAVE_PTHREAD_GET_STACKADDR_NP | |
134 | /* This method for MacOS X. | |
135 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
136 | but as of 2006 there's nothing obvious at apple.com. */ | |
137 | static void * | |
138 | get_thread_stack_base () | |
139 | { | |
140 | return pthread_get_stackaddr_np (pthread_self ()); | |
141 | } | |
142 | ||
143 | #else | |
144 | #error Threads enabled with old BDW-GC, but missing get_thread_stack_base impl. Please upgrade to libgc >= 7.1. | |
145 | #endif | |
146 | ||
147 | static int | |
987b8160 | 148 | GC_get_stack_base (struct GC_stack_base *stack_base) |
5f0d2951 | 149 | { |
12c1d861 AW |
150 | stack_base->mem_base = get_thread_stack_base (); |
151 | #ifdef __ia64__ | |
152 | /* Calculate and store off the base of this thread's register | |
153 | backing store (RBS). Unfortunately our implementation(s) of | |
154 | scm_ia64_register_backing_store_base are only reliable for the | |
155 | main thread. For other threads, therefore, find out the current | |
156 | top of the RBS, and use that as a maximum. */ | |
157 | stack_base->reg_base = scm_ia64_register_backing_store_base (); | |
158 | { | |
159 | ucontext_t ctx; | |
160 | void *bsp; | |
161 | getcontext (&ctx); | |
162 | bsp = scm_ia64_ar_bsp (&ctx); | |
163 | if (stack_base->reg_base > bsp) | |
164 | stack_base->reg_base = bsp; | |
165 | } | |
166 | #endif | |
167 | return GC_SUCCESS; | |
5f0d2951 | 168 | } |
12c1d861 AW |
169 | |
170 | static void * | |
171 | GC_call_with_stack_base(void * (*fn) (struct GC_stack_base*, void*), void *arg) | |
172 | { | |
173 | struct GC_stack_base stack_base; | |
174 | ||
175 | stack_base.mem_base = (void*)&stack_base; | |
176 | #ifdef __ia64__ | |
177 | /* FIXME: Untested. */ | |
178 | { | |
179 | ucontext_t ctx; | |
180 | getcontext (&ctx); | |
181 | stack_base.reg_base = scm_ia64_ar_bsp (&ctx); | |
182 | } | |
5f0d2951 AW |
183 | #endif |
184 | ||
12c1d861 AW |
185 | return fn (&stack_base, arg); |
186 | } | |
187 | #endif /* HAVE_GC_STACK_BASE */ | |
188 | ||
5f0d2951 | 189 | |
cde24ce1 AW |
190 | /* Now define with_gc_active and with_gc_inactive. */ |
191 | ||
192 | #if (defined(HAVE_GC_DO_BLOCKING) && defined (HAVE_DECL_GC_DO_BLOCKING) && defined (HAVE_GC_CALL_WITH_GC_ACTIVE)) | |
193 | ||
194 | /* We have a sufficiently new libgc (7.2 or newer). */ | |
195 | ||
196 | static void* | |
197 | with_gc_inactive (GC_fn_type func, void *data) | |
198 | { | |
199 | return GC_do_blocking (func, data); | |
200 | } | |
201 | ||
202 | static void* | |
203 | with_gc_active (GC_fn_type func, void *data) | |
204 | { | |
205 | return GC_call_with_gc_active (func, data); | |
206 | } | |
207 | ||
208 | #else | |
209 | ||
210 | /* libgc not new enough, so never actually deactivate GC. | |
211 | ||
212 | Note that though GC 7.1 does have a GC_do_blocking, it doesn't have | |
213 | GC_call_with_gc_active. */ | |
214 | ||
215 | static void* | |
216 | with_gc_inactive (GC_fn_type func, void *data) | |
217 | { | |
218 | return func (data); | |
219 | } | |
220 | ||
221 | static void* | |
222 | with_gc_active (GC_fn_type func, void *data) | |
223 | { | |
224 | return func (data); | |
225 | } | |
226 | ||
227 | #endif /* HAVE_GC_DO_BLOCKING */ | |
228 | ||
229 | ||
634aa8de | 230 | \f |
6180e336 NJ |
231 | static void |
232 | to_timespec (SCM t, scm_t_timespec *waittime) | |
233 | { | |
234 | if (scm_is_pair (t)) | |
235 | { | |
236 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
237 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
238 | } | |
239 | else | |
240 | { | |
241 | double time = scm_to_double (t); | |
242 | double sec = scm_c_truncate (time); | |
243 | ||
244 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 245 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
246 | } |
247 | } | |
248 | ||
c058db8a | 249 | \f |
d823b11b | 250 | /*** Queues */ |
7bfd3b9e | 251 | |
c058db8a LC |
252 | /* Note: We annotate with "GC-robust" assignments whose purpose is to avoid |
253 | the risk of false references leading to unbounded retained space as | |
254 | described in "Bounding Space Usage of Conservative Garbage Collectors", | |
255 | H.J. Boehm, 2001. */ | |
256 | ||
9de87eea MV |
257 | /* Make an empty queue data structure. |
258 | */ | |
d823b11b MV |
259 | static SCM |
260 | make_queue () | |
261 | { | |
262 | return scm_cons (SCM_EOL, SCM_EOL); | |
263 | } | |
7bfd3b9e | 264 | |
9de87eea MV |
265 | /* Put T at the back of Q and return a handle that can be used with |
266 | remqueue to remove T from Q again. | |
267 | */ | |
d823b11b MV |
268 | static SCM |
269 | enqueue (SCM q, SCM t) | |
270 | { | |
271 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 272 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 273 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
274 | SCM_SETCDR (q, c); |
275 | else | |
276 | SCM_SETCDR (SCM_CAR (q), c); | |
277 | SCM_SETCAR (q, c); | |
d2a51087 | 278 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
279 | return c; |
280 | } | |
7bfd3b9e | 281 | |
9de87eea MV |
282 | /* Remove the element that the handle C refers to from the queue Q. C |
283 | must have been returned from a call to enqueue. The return value | |
284 | is zero when the element referred to by C has already been removed. | |
285 | Otherwise, 1 is returned. | |
286 | */ | |
287 | static int | |
d823b11b MV |
288 | remqueue (SCM q, SCM c) |
289 | { | |
290 | SCM p, prev = q; | |
d2a51087 | 291 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 292 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 293 | { |
bc36d050 | 294 | if (scm_is_eq (p, c)) |
d823b11b | 295 | { |
bc36d050 | 296 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
297 | SCM_SETCAR (q, SCM_CDR (c)); |
298 | SCM_SETCDR (prev, SCM_CDR (c)); | |
c058db8a LC |
299 | |
300 | /* GC-robust */ | |
301 | SCM_SETCDR (c, SCM_EOL); | |
302 | ||
d2a51087 | 303 | SCM_CRITICAL_SECTION_END; |
9de87eea | 304 | return 1; |
d823b11b MV |
305 | } |
306 | prev = p; | |
307 | } | |
d2a51087 | 308 | SCM_CRITICAL_SECTION_END; |
9de87eea | 309 | return 0; |
d823b11b MV |
310 | } |
311 | ||
9de87eea MV |
312 | /* Remove the front-most element from the queue Q and return it. |
313 | Return SCM_BOOL_F when Q is empty. | |
314 | */ | |
d823b11b MV |
315 | static SCM |
316 | dequeue (SCM q) | |
317 | { | |
d2a51087 NJ |
318 | SCM c; |
319 | SCM_CRITICAL_SECTION_START; | |
320 | c = SCM_CDR (q); | |
d2e53ed6 | 321 | if (scm_is_null (c)) |
d2a51087 NJ |
322 | { |
323 | SCM_CRITICAL_SECTION_END; | |
324 | return SCM_BOOL_F; | |
325 | } | |
d823b11b MV |
326 | else |
327 | { | |
328 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 329 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 330 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 331 | SCM_CRITICAL_SECTION_END; |
c058db8a LC |
332 | |
333 | /* GC-robust */ | |
334 | SCM_SETCDR (c, SCM_EOL); | |
335 | ||
d823b11b MV |
336 | return SCM_CAR (c); |
337 | } | |
338 | } | |
7bfd3b9e | 339 | |
9de87eea | 340 | /*** Thread smob routines */ |
76da80e7 | 341 | |
d823b11b MV |
342 | |
343 | static int | |
344 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
345 | { | |
23d72566 KR |
346 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
347 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
348 | the struct case, hence we go via a union, and extract according to the | |
349 | size of pthread_t. */ | |
350 | union { | |
351 | scm_i_pthread_t p; | |
352 | unsigned short us; | |
353 | unsigned int ui; | |
354 | unsigned long ul; | |
355 | scm_t_uintmax um; | |
356 | } u; | |
9de87eea | 357 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
358 | scm_i_pthread_t p = t->pthread; |
359 | scm_t_uintmax id; | |
360 | u.p = p; | |
361 | if (sizeof (p) == sizeof (unsigned short)) | |
362 | id = u.us; | |
363 | else if (sizeof (p) == sizeof (unsigned int)) | |
364 | id = u.ui; | |
365 | else if (sizeof (p) == sizeof (unsigned long)) | |
366 | id = u.ul; | |
367 | else | |
368 | id = u.um; | |
369 | ||
d823b11b | 370 | scm_puts ("#<thread ", port); |
23d72566 | 371 | scm_uintprint (id, 10, port); |
1b92fb6b | 372 | scm_puts (" (", port); |
0345e278 | 373 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 374 | scm_puts (")>", port); |
d823b11b MV |
375 | return 1; |
376 | } | |
377 | ||
706846f6 | 378 | \f |
9de87eea | 379 | /*** Blocking on queues. */ |
f7eca35d | 380 | |
9de87eea MV |
381 | /* See also scm_i_queue_async_cell for how such a block is |
382 | interrputed. | |
383 | */ | |
d823b11b | 384 | |
9de87eea MV |
385 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
386 | be woken up by a call to 'unblock_from_queue', or to be | |
387 | interrupted. Upon return of this function, the current thread is | |
388 | no longer on QUEUE, even when the sleep has been interrupted. | |
389 | ||
d2a51087 | 390 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
391 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
392 | ||
393 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
394 | as MUTEX is needed. | |
395 | ||
396 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
397 | ||
398 | The return value of block_self is an errno value. It will be zero | |
399 | when the sleep has been successfully completed by a call to | |
400 | unblock_from_queue, EINTR when it has been interrupted by the | |
401 | delivery of a system async, and ETIMEDOUT when the timeout has | |
402 | expired. | |
403 | ||
404 | The system asyncs themselves are not executed by block_self. | |
405 | */ | |
406 | static int | |
407 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
408 | const scm_t_timespec *waittime) | |
76da80e7 | 409 | { |
9de87eea MV |
410 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
411 | SCM q_handle; | |
412 | int err; | |
413 | ||
414 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
415 | err = EINTR; | |
416 | else | |
417 | { | |
418 | t->block_asyncs++; | |
419 | q_handle = enqueue (queue, t->handle); | |
420 | if (waittime == NULL) | |
421 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
422 | else | |
423 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
424 | ||
425 | /* When we are still on QUEUE, we have been interrupted. We | |
426 | report this only when no other error (such as a timeout) has | |
427 | happened above. | |
428 | */ | |
429 | if (remqueue (queue, q_handle) && err == 0) | |
430 | err = EINTR; | |
431 | t->block_asyncs--; | |
432 | scm_i_reset_sleep (t); | |
433 | } | |
434 | ||
435 | return err; | |
76da80e7 | 436 | } |
9de87eea | 437 | |
d2a51087 NJ |
438 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
439 | returned, or #f if the queue was empty. | |
9de87eea MV |
440 | */ |
441 | static SCM | |
442 | unblock_from_queue (SCM queue) | |
443 | { | |
444 | SCM thread = dequeue (queue); | |
445 | if (scm_is_true (thread)) | |
446 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
447 | return thread; | |
448 | } | |
449 | ||
45f15cac | 450 | \f |
9de87eea MV |
451 | /* Getting into and out of guile mode. |
452 | */ | |
453 | ||
f60a7648 AW |
454 | /* Key used to attach a cleanup handler to a given thread. Also, if |
455 | thread-local storage is unavailable, this key is used to retrieve the | |
456 | current thread with `pthread_getspecific ()'. */ | |
457 | scm_i_pthread_key_t scm_i_thread_key; | |
458 | ||
459 | ||
705edb95 LC |
460 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
461 | ||
462 | /* When thread-local storage (TLS) is available, a pointer to the | |
463 | current-thread object is kept in TLS. Note that storing the thread-object | |
464 | itself in TLS (rather than a pointer to some malloc'd memory) is not | |
465 | possible since thread objects may live longer than the actual thread they | |
466 | represent. */ | |
467 | SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread = NULL; | |
468 | ||
f60a7648 | 469 | #endif /* SCM_HAVE_THREAD_STORAGE_CLASS */ |
705edb95 | 470 | |
d823b11b | 471 | |
9de87eea MV |
472 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
473 | static scm_i_thread *all_threads = NULL; | |
474 | static int thread_count; | |
475 | ||
476 | static SCM scm_i_default_dynamic_state; | |
477 | ||
0b77014f AW |
478 | /* Run when a fluid is collected. */ |
479 | void | |
480 | scm_i_reset_fluid (size_t n, SCM val) | |
481 | { | |
482 | scm_i_thread *t; | |
483 | ||
484 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
485 | for (t = all_threads; t; t = t->next_thread) | |
486 | if (SCM_I_DYNAMIC_STATE_P (t->dynamic_state)) | |
487 | { | |
488 | SCM v = SCM_I_DYNAMIC_STATE_FLUIDS (t->dynamic_state); | |
489 | ||
490 | if (n < SCM_SIMPLE_VECTOR_LENGTH (v)) | |
491 | SCM_SIMPLE_VECTOR_SET (v, n, val); | |
492 | } | |
493 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
494 | } | |
495 | ||
9de87eea | 496 | /* Perform first stage of thread initialisation, in non-guile mode. |
d823b11b | 497 | */ |
9de87eea | 498 | static void |
12c1d861 | 499 | guilify_self_1 (struct GC_stack_base *base) |
d823b11b | 500 | { |
7f22442b AW |
501 | scm_i_thread t; |
502 | ||
503 | /* We must arrange for SCM_I_CURRENT_THREAD to point to a valid value | |
504 | before allocating anything in this thread, because allocation could | |
505 | cause GC to run, and GC could cause finalizers, which could invoke | |
506 | Scheme functions, which need the current thread to be set. */ | |
507 | ||
508 | t.pthread = scm_i_pthread_self (); | |
509 | t.handle = SCM_BOOL_F; | |
510 | t.result = SCM_BOOL_F; | |
511 | t.cleanup_handler = SCM_BOOL_F; | |
512 | t.mutexes = SCM_EOL; | |
513 | t.held_mutex = NULL; | |
514 | t.join_queue = SCM_EOL; | |
515 | t.dynamic_state = SCM_BOOL_F; | |
516 | t.dynwinds = SCM_EOL; | |
517 | t.active_asyncs = SCM_EOL; | |
518 | t.block_asyncs = 1; | |
519 | t.pending_asyncs = 1; | |
520 | t.critical_section_level = 0; | |
521 | t.base = base->mem_base; | |
346e4402 | 522 | #ifdef __ia64__ |
7f22442b | 523 | t.register_backing_store_base = base->reg-base; |
346e4402 | 524 | #endif |
7f22442b AW |
525 | t.continuation_root = SCM_EOL; |
526 | t.continuation_base = t.base; | |
527 | scm_i_pthread_cond_init (&t.sleep_cond, NULL); | |
528 | t.sleep_mutex = NULL; | |
529 | t.sleep_object = SCM_BOOL_F; | |
530 | t.sleep_fd = -1; | |
531 | ||
32f94bf2 | 532 | if (pipe2 (t.sleep_pipe, O_CLOEXEC) != 0) |
634aa8de LC |
533 | /* FIXME: Error conditions during the initialization phase are handled |
534 | gracelessly since public functions such as `scm_init_guile ()' | |
535 | currently have type `void'. */ | |
536 | abort (); | |
537 | ||
7f22442b AW |
538 | scm_i_pthread_mutex_init (&t.admin_mutex, NULL); |
539 | t.current_mark_stack_ptr = NULL; | |
540 | t.current_mark_stack_limit = NULL; | |
541 | t.canceled = 0; | |
542 | t.exited = 0; | |
543 | t.guile_mode = 0; | |
9de87eea | 544 | |
7f22442b AW |
545 | /* The switcheroo. */ |
546 | { | |
547 | scm_i_thread *t_ptr = &t; | |
548 | ||
549 | GC_disable (); | |
550 | t_ptr = GC_malloc (sizeof (scm_i_thread)); | |
551 | memcpy (t_ptr, &t, sizeof t); | |
552 | ||
553 | scm_i_pthread_setspecific (scm_i_thread_key, t_ptr); | |
f60a7648 AW |
554 | |
555 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
7f22442b AW |
556 | /* Cache the current thread in TLS for faster lookup. */ |
557 | scm_i_current_thread = t_ptr; | |
f60a7648 | 558 | #endif |
9de87eea | 559 | |
7f22442b AW |
560 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
561 | t_ptr->next_thread = all_threads; | |
562 | all_threads = t_ptr; | |
563 | thread_count++; | |
564 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
565 | ||
566 | GC_enable (); | |
567 | } | |
d823b11b MV |
568 | } |
569 | ||
9de87eea | 570 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 571 | */ |
9de87eea MV |
572 | static void |
573 | guilify_self_2 (SCM parent) | |
d823b11b | 574 | { |
9de87eea MV |
575 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
576 | ||
72e6b608 LC |
577 | t->guile_mode = 1; |
578 | ||
9de87eea | 579 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 580 | |
9de87eea MV |
581 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
582 | t->continuation_base = t->base; | |
2bbe1533 | 583 | t->vm = SCM_BOOL_F; |
9de87eea MV |
584 | |
585 | if (scm_is_true (parent)) | |
586 | t->dynamic_state = scm_make_dynamic_state (parent); | |
587 | else | |
588 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
589 | ||
590 | t->join_queue = make_queue (); | |
591 | t->block_asyncs = 0; | |
d823b11b MV |
592 | } |
593 | ||
6180e336 NJ |
594 | \f |
595 | /*** Fat mutexes */ | |
596 | ||
597 | /* We implement our own mutex type since we want them to be 'fair', we | |
598 | want to do fancy things while waiting for them (like running | |
599 | asyncs) and we might want to add things that are nice for | |
600 | debugging. | |
601 | */ | |
602 | ||
603 | typedef struct { | |
604 | scm_i_pthread_mutex_t lock; | |
605 | SCM owner; | |
adc085f1 | 606 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 607 | |
adc085f1 | 608 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
609 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
610 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
611 | owned by the current thread? */ | |
612 | ||
613 | SCM waiting; /* the threads waiting for this mutex. */ | |
614 | } fat_mutex; | |
615 | ||
616 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
617 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
618 | ||
2002f1f8 AW |
619 | static SCM |
620 | call_cleanup (void *data) | |
621 | { | |
622 | SCM *proc_p = data; | |
623 | return scm_call_0 (*proc_p); | |
624 | } | |
625 | ||
9de87eea | 626 | /* Perform thread tear-down, in guile mode. |
d823b11b | 627 | */ |
9de87eea MV |
628 | static void * |
629 | do_thread_exit (void *v) | |
630 | { | |
2e77f720 LC |
631 | scm_i_thread *t = (scm_i_thread *) v; |
632 | ||
633 | if (!scm_is_false (t->cleanup_handler)) | |
634 | { | |
635 | SCM ptr = t->cleanup_handler; | |
636 | ||
637 | t->cleanup_handler = SCM_BOOL_F; | |
638 | t->result = scm_internal_catch (SCM_BOOL_T, | |
2002f1f8 | 639 | call_cleanup, &ptr, |
2e77f720 LC |
640 | scm_handle_by_message_noexit, NULL); |
641 | } | |
9de87eea | 642 | |
86a597f8 | 643 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
644 | |
645 | t->exited = 1; | |
0c97d7dd MV |
646 | close (t->sleep_pipe[0]); |
647 | close (t->sleep_pipe[1]); | |
9de87eea MV |
648 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
649 | ; | |
9de87eea | 650 | |
74926120 | 651 | while (!scm_is_null (t->mutexes)) |
6180e336 | 652 | { |
a141db86 | 653 | SCM mutex = scm_c_weak_vector_ref (scm_car (t->mutexes), 0); |
74926120 | 654 | |
a141db86 | 655 | if (scm_is_true (mutex)) |
a0faf7dd LC |
656 | { |
657 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
658 | ||
659 | scm_i_pthread_mutex_lock (&m->lock); | |
f57fdf07 LC |
660 | |
661 | /* Since MUTEX is in `t->mutexes', T must be its owner. */ | |
662 | assert (scm_is_eq (m->owner, t->handle)); | |
663 | ||
a0faf7dd | 664 | unblock_from_queue (m->waiting); |
f57fdf07 | 665 | |
a0faf7dd LC |
666 | scm_i_pthread_mutex_unlock (&m->lock); |
667 | } | |
6180e336 | 668 | |
a141db86 | 669 | t->mutexes = scm_cdr (t->mutexes); |
6180e336 NJ |
670 | } |
671 | ||
86a597f8 | 672 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 673 | |
9de87eea MV |
674 | return NULL; |
675 | } | |
676 | ||
f60a7648 AW |
677 | static void * |
678 | do_thread_exit_trampoline (struct GC_stack_base *sb, void *v) | |
679 | { | |
7f22442b | 680 | /* Won't hurt if we are already registered. */ |
8e76ce94 | 681 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 682 | GC_register_my_thread (sb); |
8e76ce94 | 683 | #endif |
f60a7648 | 684 | |
7f22442b | 685 | return scm_with_guile (do_thread_exit, v); |
f60a7648 AW |
686 | } |
687 | ||
d823b11b | 688 | static void |
9de87eea | 689 | on_thread_exit (void *v) |
d823b11b | 690 | { |
29776e85 | 691 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 692 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 693 | |
b8441577 LC |
694 | /* If we were canceled, we were unable to clear `t->guile_mode', so do |
695 | it here. */ | |
696 | t->guile_mode = 0; | |
697 | ||
d2a51087 NJ |
698 | /* If this thread was cancelled while doing a cond wait, it will |
699 | still have a mutex locked, so we unlock it here. */ | |
700 | if (t->held_mutex) | |
701 | { | |
702 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
703 | t->held_mutex = NULL; | |
704 | } | |
705 | ||
f60a7648 AW |
706 | /* Reinstate the current thread for purposes of scm_with_guile |
707 | guile-mode cleanup handlers. Only really needed in the non-TLS | |
708 | case but it doesn't hurt to be consistent. */ | |
709 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
0c97d7dd | 710 | |
7f22442b AW |
711 | /* Scheme-level thread finalizers and other cleanup needs to happen in |
712 | guile mode. */ | |
713 | GC_call_with_stack_base (do_thread_exit_trampoline, t); | |
0c97d7dd MV |
714 | |
715 | /* Removing ourself from the list of all threads needs to happen in | |
716 | non-guile mode since all SCM values on our stack become | |
29776e85 | 717 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
718 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
719 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
720 | if (*tp == t) | |
721 | { | |
722 | *tp = t->next_thread; | |
c058db8a LC |
723 | |
724 | /* GC-robust */ | |
725 | t->next_thread = NULL; | |
726 | ||
0c97d7dd MV |
727 | break; |
728 | } | |
729 | thread_count--; | |
2e77f720 LC |
730 | |
731 | /* If there's only one other thread, it could be the signal delivery | |
732 | thread, so we need to notify it to shut down by closing its read pipe. | |
733 | If it's not the signal delivery thread, then closing the read pipe isn't | |
734 | going to hurt. */ | |
735 | if (thread_count <= 1) | |
736 | scm_i_close_signal_pipe (); | |
737 | ||
0c97d7dd MV |
738 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
739 | ||
f60a7648 | 740 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
7f22442b | 741 | |
8e76ce94 | 742 | #if SCM_USE_PTHREAD_THREADS |
7f22442b | 743 | GC_unregister_my_thread (); |
653ccd78 | 744 | #endif |
d823b11b MV |
745 | } |
746 | ||
9de87eea | 747 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 748 | |
9de87eea MV |
749 | static void |
750 | init_thread_key (void) | |
751 | { | |
f60a7648 | 752 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); |
9de87eea | 753 | } |
d823b11b | 754 | |
cde24ce1 AW |
755 | /* Perform any initializations necessary to make the current thread |
756 | known to Guile (via SCM_I_CURRENT_THREAD), initializing Guile itself, | |
757 | if necessary. | |
a54a94b3 | 758 | |
9de87eea MV |
759 | BASE is the stack base to use with GC. |
760 | ||
761 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
762 | which case the default dynamic state is used. | |
763 | ||
cde24ce1 | 764 | Returns zero when the thread was known to guile already; otherwise |
9de87eea | 765 | return 1. |
cde24ce1 AW |
766 | |
767 | Note that it could be the case that the thread was known | |
768 | to Guile, but not in guile mode (because we are within a | |
769 | scm_without_guile call). Check SCM_I_CURRENT_THREAD->guile_mode to | |
770 | be sure. New threads are put into guile mode implicitly. */ | |
9de87eea MV |
771 | |
772 | static int | |
12c1d861 | 773 | scm_i_init_thread_for_guile (struct GC_stack_base *base, SCM parent) |
d823b11b | 774 | { |
9de87eea MV |
775 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); |
776 | ||
cde24ce1 AW |
777 | if (SCM_I_CURRENT_THREAD) |
778 | { | |
779 | /* Thread is already known to Guile. | |
780 | */ | |
781 | return 0; | |
782 | } | |
783 | else | |
9de87eea MV |
784 | { |
785 | /* This thread has not been guilified yet. | |
786 | */ | |
787 | ||
788 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
789 | if (scm_initialized_p == 0) | |
790 | { | |
791 | /* First thread ever to enter Guile. Run the full | |
792 | initialization. | |
793 | */ | |
794 | scm_i_init_guile (base); | |
12c1d861 | 795 | |
8e76ce94 | 796 | #if defined (HAVE_GC_ALLOW_REGISTER_THREADS) && SCM_USE_PTHREAD_THREADS |
12c1d861 AW |
797 | /* Allow other threads to come in later. */ |
798 | GC_allow_register_threads (); | |
4000d064 | 799 | #endif |
12c1d861 | 800 | |
9de87eea MV |
801 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); |
802 | } | |
803 | else | |
804 | { | |
805 | /* Guile is already initialized, but this thread enters it for | |
806 | the first time. Only initialize this thread. | |
807 | */ | |
808 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
12c1d861 AW |
809 | |
810 | /* Register this thread with libgc. */ | |
8e76ce94 | 811 | #if SCM_USE_PTHREAD_THREADS |
12c1d861 | 812 | GC_register_my_thread (base); |
8e76ce94 | 813 | #endif |
12c1d861 | 814 | |
9de87eea MV |
815 | guilify_self_1 (base); |
816 | guilify_self_2 (parent); | |
817 | } | |
818 | return 1; | |
819 | } | |
d823b11b MV |
820 | } |
821 | ||
12c1d861 AW |
822 | void |
823 | scm_init_guile () | |
d823b11b | 824 | { |
12c1d861 AW |
825 | struct GC_stack_base stack_base; |
826 | ||
827 | if (GC_get_stack_base (&stack_base) == GC_SUCCESS) | |
828 | scm_i_init_thread_for_guile (&stack_base, | |
829 | scm_i_default_dynamic_state); | |
9de87eea MV |
830 | else |
831 | { | |
12c1d861 | 832 | fprintf (stderr, "Failed to get stack base for current thread.\n"); |
4765b28f | 833 | exit (EXIT_FAILURE); |
9de87eea | 834 | } |
a54a94b3 MV |
835 | } |
836 | ||
12c1d861 | 837 | struct with_guile_args |
cde24ce1 AW |
838 | { |
839 | GC_fn_type func; | |
840 | void *data; | |
12c1d861 | 841 | SCM parent; |
cde24ce1 AW |
842 | }; |
843 | ||
844 | static void * | |
845 | with_guile_trampoline (void *data) | |
846 | { | |
12c1d861 | 847 | struct with_guile_args *args = data; |
cde24ce1 AW |
848 | |
849 | return scm_c_with_continuation_barrier (args->func, args->data); | |
850 | } | |
851 | ||
12c1d861 AW |
852 | static void * |
853 | with_guile_and_parent (struct GC_stack_base *base, void *data) | |
9de87eea MV |
854 | { |
855 | void *res; | |
cde24ce1 AW |
856 | int new_thread; |
857 | scm_i_thread *t; | |
12c1d861 | 858 | struct with_guile_args *args = data; |
2e77f720 | 859 | |
12c1d861 | 860 | new_thread = scm_i_init_thread_for_guile (base, args->parent); |
cde24ce1 AW |
861 | t = SCM_I_CURRENT_THREAD; |
862 | if (new_thread) | |
2e77f720 | 863 | { |
cde24ce1 AW |
864 | /* We are in Guile mode. */ |
865 | assert (t->guile_mode); | |
866 | ||
12c1d861 | 867 | res = scm_c_with_continuation_barrier (args->func, args->data); |
cde24ce1 AW |
868 | |
869 | /* Leave Guile mode. */ | |
870 | t->guile_mode = 0; | |
871 | } | |
872 | else if (t->guile_mode) | |
873 | { | |
874 | /* Already in Guile mode. */ | |
12c1d861 | 875 | res = scm_c_with_continuation_barrier (args->func, args->data); |
2e77f720 | 876 | } |
74926120 | 877 | else |
cde24ce1 | 878 | { |
cde24ce1 AW |
879 | /* We are not in Guile mode, either because we are not within a |
880 | scm_with_guile, or because we are within a scm_without_guile. | |
72e6b608 | 881 | |
cde24ce1 AW |
882 | This call to scm_with_guile() could happen from anywhere on the |
883 | stack, and in particular lower on the stack than when it was | |
884 | when this thread was first guilified. Thus, `base' must be | |
885 | updated. */ | |
886 | #if SCM_STACK_GROWS_UP | |
12c1d861 AW |
887 | if (SCM_STACK_PTR (base->mem_base) < t->base) |
888 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 889 | #else |
12c1d861 AW |
890 | if (SCM_STACK_PTR (base->mem_base) > t->base) |
891 | t->base = SCM_STACK_PTR (base->mem_base); | |
cde24ce1 | 892 | #endif |
72e6b608 | 893 | |
cde24ce1 | 894 | t->guile_mode = 1; |
12c1d861 | 895 | res = with_gc_active (with_guile_trampoline, args); |
cde24ce1 AW |
896 | t->guile_mode = 0; |
897 | } | |
898 | return res; | |
72e6b608 | 899 | } |
3d1af79f | 900 | |
12c1d861 AW |
901 | static void * |
902 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) | |
903 | { | |
904 | struct with_guile_args args; | |
905 | ||
906 | args.func = func; | |
907 | args.data = data; | |
908 | args.parent = parent; | |
909 | ||
910 | return GC_call_with_stack_base (with_guile_and_parent, &args); | |
911 | } | |
912 | ||
913 | void * | |
914 | scm_with_guile (void *(*func)(void *), void *data) | |
915 | { | |
916 | return scm_i_with_guile_and_parent (func, data, | |
917 | scm_i_default_dynamic_state); | |
918 | } | |
919 | ||
9de87eea MV |
920 | void * |
921 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 922 | { |
72e6b608 | 923 | void *result; |
cde24ce1 | 924 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
72e6b608 | 925 | |
cde24ce1 | 926 | if (t->guile_mode) |
72e6b608 | 927 | { |
cde24ce1 AW |
928 | SCM_I_CURRENT_THREAD->guile_mode = 0; |
929 | result = with_gc_inactive (func, data); | |
930 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
72e6b608 LC |
931 | } |
932 | else | |
cde24ce1 | 933 | /* Otherwise we're not in guile mode, so nothing to do. */ |
72e6b608 LC |
934 | result = func (data); |
935 | ||
936 | return result; | |
9de87eea MV |
937 | } |
938 | ||
72e6b608 | 939 | \f |
9de87eea MV |
940 | /*** Thread creation */ |
941 | ||
942 | typedef struct { | |
943 | SCM parent; | |
944 | SCM thunk; | |
945 | SCM handler; | |
76da80e7 | 946 | SCM thread; |
9de87eea MV |
947 | scm_i_pthread_mutex_t mutex; |
948 | scm_i_pthread_cond_t cond; | |
949 | } launch_data; | |
d823b11b | 950 | |
9de87eea MV |
951 | static void * |
952 | really_launch (void *d) | |
953 | { | |
954 | launch_data *data = (launch_data *)d; | |
955 | SCM thunk = data->thunk, handler = data->handler; | |
956 | scm_i_thread *t; | |
d823b11b | 957 | |
9de87eea | 958 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 959 | |
9de87eea MV |
960 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
961 | data->thread = scm_current_thread (); | |
962 | scm_i_pthread_cond_signal (&data->cond); | |
963 | scm_i_pthread_mutex_unlock (&data->mutex); | |
964 | ||
965 | if (SCM_UNBNDP (handler)) | |
966 | t->result = scm_call_0 (thunk); | |
967 | else | |
968 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
969 | ||
970 | return 0; | |
d823b11b MV |
971 | } |
972 | ||
9de87eea MV |
973 | static void * |
974 | launch_thread (void *d) | |
975 | { | |
976 | launch_data *data = (launch_data *)d; | |
977 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
978 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
979 | return NULL; | |
980 | } | |
981 | ||
982 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 983 | (SCM thunk, SCM handler), |
9de87eea MV |
984 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
985 | "returning a new thread object representing the thread. The procedure\n" | |
986 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
987 | "\n" | |
988 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
989 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
990 | "handler. This catch is established inside the continuation barrier.\n" | |
991 | "\n" | |
992 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
993 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
994 | #define FUNC_NAME s_scm_call_with_new_thread |
995 | { | |
9de87eea MV |
996 | launch_data data; |
997 | scm_i_pthread_t id; | |
998 | int err; | |
d823b11b | 999 | |
9de87eea MV |
1000 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
1001 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
1002 | handler, SCM_ARG2, FUNC_NAME); | |
1003 | ||
1004 | data.parent = scm_current_dynamic_state (); | |
1005 | data.thunk = thunk; | |
1006 | data.handler = handler; | |
1007 | data.thread = SCM_BOOL_F; | |
1008 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1009 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1010 | ||
1011 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1012 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
1013 | if (err) | |
1014 | { | |
1015 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1016 | errno = err; | |
1017 | scm_syserror (NULL); | |
1018 | } | |
1019 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1020 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1021 | |
9de87eea | 1022 | return data.thread; |
d823b11b MV |
1023 | } |
1024 | #undef FUNC_NAME | |
1025 | ||
9de87eea MV |
1026 | typedef struct { |
1027 | SCM parent; | |
1028 | scm_t_catch_body body; | |
1029 | void *body_data; | |
1030 | scm_t_catch_handler handler; | |
1031 | void *handler_data; | |
1032 | SCM thread; | |
1033 | scm_i_pthread_mutex_t mutex; | |
1034 | scm_i_pthread_cond_t cond; | |
1035 | } spawn_data; | |
1036 | ||
1037 | static void * | |
1038 | really_spawn (void *d) | |
1039 | { | |
1040 | spawn_data *data = (spawn_data *)d; | |
1041 | scm_t_catch_body body = data->body; | |
1042 | void *body_data = data->body_data; | |
1043 | scm_t_catch_handler handler = data->handler; | |
1044 | void *handler_data = data->handler_data; | |
1045 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1046 | ||
1047 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1048 | data->thread = scm_current_thread (); | |
1049 | scm_i_pthread_cond_signal (&data->cond); | |
1050 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1051 | ||
1052 | if (handler == NULL) | |
1053 | t->result = body (body_data); | |
1054 | else | |
1055 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1056 | body, body_data, | |
1057 | handler, handler_data); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static void * | |
1063 | spawn_thread (void *d) | |
1064 | { | |
1065 | spawn_data *data = (spawn_data *)d; | |
1066 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1067 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1068 | return NULL; | |
1069 | } | |
1070 | ||
1071 | SCM | |
1072 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1073 | scm_t_catch_handler handler, void *handler_data) | |
1074 | { | |
1075 | spawn_data data; | |
1076 | scm_i_pthread_t id; | |
1077 | int err; | |
1078 | ||
1079 | data.parent = scm_current_dynamic_state (); | |
1080 | data.body = body; | |
1081 | data.body_data = body_data; | |
1082 | data.handler = handler; | |
1083 | data.handler_data = handler_data; | |
1084 | data.thread = SCM_BOOL_F; | |
1085 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1086 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1087 | ||
1088 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1089 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1090 | if (err) | |
1091 | { | |
1092 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1093 | errno = err; | |
1094 | scm_syserror (NULL); | |
1095 | } | |
1096 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1097 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1098 | |
9de87eea MV |
1099 | return data.thread; |
1100 | } | |
1101 | ||
29717c89 MD |
1102 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1103 | (), | |
1104 | "Move the calling thread to the end of the scheduling queue.") | |
1105 | #define FUNC_NAME s_scm_yield | |
1106 | { | |
9de87eea | 1107 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1108 | } |
1109 | #undef FUNC_NAME | |
1110 | ||
2e77f720 LC |
1111 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1112 | (SCM thread), | |
1113 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1114 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1115 | "been signaled to terminate, this function is a no-op.") | |
1116 | #define FUNC_NAME s_scm_cancel_thread | |
1117 | { | |
1118 | scm_i_thread *t = NULL; | |
1119 | ||
1120 | SCM_VALIDATE_THREAD (1, thread); | |
1121 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1122 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1123 | if (!t->canceled) |
1124 | { | |
1125 | t->canceled = 1; | |
86a597f8 | 1126 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1127 | scm_i_pthread_cancel (t->pthread); |
1128 | } | |
1129 | else | |
86a597f8 | 1130 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1131 | |
1132 | return SCM_UNSPECIFIED; | |
1133 | } | |
1134 | #undef FUNC_NAME | |
1135 | ||
1136 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1137 | (SCM thread, SCM proc), | |
1138 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1139 | "This handler will be called when the thread exits.") | |
1140 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1141 | { | |
1142 | scm_i_thread *t; | |
1143 | ||
1144 | SCM_VALIDATE_THREAD (1, thread); | |
1145 | if (!scm_is_false (proc)) | |
1146 | SCM_VALIDATE_THUNK (2, proc); | |
1147 | ||
2e77f720 | 1148 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1149 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1150 | ||
2e77f720 LC |
1151 | if (!(t->exited || t->canceled)) |
1152 | t->cleanup_handler = proc; | |
1153 | ||
86a597f8 | 1154 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1155 | |
1156 | return SCM_UNSPECIFIED; | |
1157 | } | |
1158 | #undef FUNC_NAME | |
1159 | ||
1160 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1161 | (SCM thread), | |
1162 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1163 | #define FUNC_NAME s_scm_thread_cleanup | |
1164 | { | |
1165 | scm_i_thread *t; | |
1166 | SCM ret; | |
1167 | ||
1168 | SCM_VALIDATE_THREAD (1, thread); | |
1169 | ||
2e77f720 | 1170 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1171 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1172 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1173 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1174 | |
1175 | return ret; | |
1176 | } | |
1177 | #undef FUNC_NAME | |
1178 | ||
6180e336 NJ |
1179 | SCM scm_join_thread (SCM thread) |
1180 | { | |
1181 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1182 | } | |
1183 | ||
1184 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1185 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1186 | "Suspend execution of the calling thread until the target @var{thread} " |
1187 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1188 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1189 | { |
9de87eea | 1190 | scm_i_thread *t; |
6180e336 NJ |
1191 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1192 | SCM res = SCM_BOOL_F; | |
1193 | ||
1194 | if (! (SCM_UNBNDP (timeoutval))) | |
1195 | res = timeoutval; | |
d823b11b MV |
1196 | |
1197 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1198 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1199 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1200 | |
9de87eea | 1201 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1202 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1203 | ||
6180e336 NJ |
1204 | if (! SCM_UNBNDP (timeout)) |
1205 | { | |
1206 | to_timespec (timeout, &ctimeout); | |
1207 | timeout_ptr = &ctimeout; | |
1208 | } | |
1209 | ||
1210 | if (t->exited) | |
1211 | res = t->result; | |
1212 | else | |
d823b11b | 1213 | { |
9de87eea MV |
1214 | while (1) |
1215 | { | |
74926120 | 1216 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1217 | timeout_ptr); |
1218 | if (err == 0) | |
1219 | { | |
1220 | if (t->exited) | |
1221 | { | |
1222 | res = t->result; | |
1223 | break; | |
1224 | } | |
1225 | } | |
1226 | else if (err == ETIMEDOUT) | |
9de87eea | 1227 | break; |
6180e336 | 1228 | |
86a597f8 | 1229 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1230 | SCM_TICK; |
86a597f8 | 1231 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1232 | |
1233 | /* Check for exit again, since we just released and | |
1234 | reacquired the admin mutex, before the next block_self | |
1235 | call (which would block forever if t has already | |
1236 | exited). */ | |
1237 | if (t->exited) | |
1238 | { | |
1239 | res = t->result; | |
1240 | break; | |
1241 | } | |
9de87eea | 1242 | } |
d823b11b | 1243 | } |
9de87eea | 1244 | |
86a597f8 | 1245 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1246 | |
d823b11b | 1247 | return res; |
5f05c406 MV |
1248 | } |
1249 | #undef FUNC_NAME | |
1250 | ||
6180e336 NJ |
1251 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1252 | (SCM obj), | |
1253 | "Return @code{#t} if @var{obj} is a thread.") | |
1254 | #define FUNC_NAME s_scm_thread_p | |
1255 | { | |
1256 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1257 | } | |
1258 | #undef FUNC_NAME | |
5f05c406 | 1259 | |
4079f87e | 1260 | |
9de87eea MV |
1261 | static size_t |
1262 | fat_mutex_free (SCM mx) | |
76da80e7 | 1263 | { |
9de87eea MV |
1264 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1265 | scm_i_pthread_mutex_destroy (&m->lock); | |
76da80e7 MV |
1266 | return 0; |
1267 | } | |
1268 | ||
1269 | static int | |
9de87eea | 1270 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1271 | { |
9de87eea MV |
1272 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1273 | scm_puts ("#<mutex ", port); | |
1274 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1275 | scm_puts (">", port); | |
1276 | return 1; | |
76da80e7 MV |
1277 | } |
1278 | ||
76da80e7 | 1279 | static SCM |
6180e336 | 1280 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1281 | { |
9de87eea MV |
1282 | fat_mutex *m; |
1283 | SCM mx; | |
1284 | ||
1285 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1286 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1287 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1288 | m->level = 0; |
6180e336 | 1289 | |
adc085f1 | 1290 | m->recursive = recursive; |
6180e336 NJ |
1291 | m->unchecked_unlock = unchecked_unlock; |
1292 | m->allow_external_unlock = external_unlock; | |
1293 | ||
9de87eea MV |
1294 | m->waiting = SCM_EOL; |
1295 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1296 | m->waiting = make_queue (); | |
1297 | return mx; | |
76da80e7 MV |
1298 | } |
1299 | ||
6180e336 NJ |
1300 | SCM scm_make_mutex (void) |
1301 | { | |
1302 | return scm_make_mutex_with_flags (SCM_EOL); | |
1303 | } | |
1304 | ||
2a1d0688 NJ |
1305 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1306 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1307 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1308 | |
1309 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1310 | (SCM flags), | |
9de87eea | 1311 | "Create a new mutex. ") |
6180e336 | 1312 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1313 | { |
6180e336 NJ |
1314 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1315 | ||
1316 | SCM ptr = flags; | |
1317 | while (! scm_is_null (ptr)) | |
1318 | { | |
1319 | SCM flag = SCM_CAR (ptr); | |
1320 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1321 | unchecked_unlock = 1; | |
1322 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1323 | external_unlock = 1; | |
1324 | else if (scm_is_eq (flag, recursive_sym)) | |
1325 | recursive = 1; | |
74926120 | 1326 | else |
2a1d0688 | 1327 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1328 | ptr = SCM_CDR (ptr); |
1329 | } | |
1330 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1331 | } |
1332 | #undef FUNC_NAME | |
1333 | ||
9de87eea | 1334 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1335 | (void), |
9de87eea MV |
1336 | "Create a new recursive mutex. ") |
1337 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1338 | { |
6180e336 | 1339 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1340 | } |
1341 | #undef FUNC_NAME | |
1342 | ||
6180e336 NJ |
1343 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1344 | ||
1345 | static SCM | |
adc085f1 | 1346 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1347 | { |
1348 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1349 | |
adc085f1 | 1350 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1351 | SCM err = SCM_BOOL_F; |
1352 | ||
1353 | struct timeval current_time; | |
9de87eea MV |
1354 | |
1355 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1356 | |
1357 | while (1) | |
9de87eea | 1358 | { |
adc085f1 | 1359 | if (m->level == 0) |
6180e336 | 1360 | { |
adc085f1 | 1361 | m->owner = new_owner; |
6180e336 | 1362 | m->level++; |
74926120 | 1363 | |
adc085f1 | 1364 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1365 | { |
adc085f1 | 1366 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
ccb80964 | 1367 | |
4f39f31e LC |
1368 | /* FIXME: The order in which `t->admin_mutex' and |
1369 | `m->lock' are taken differs from that in | |
1370 | `on_thread_exit', potentially leading to deadlocks. */ | |
6180e336 | 1371 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
a0faf7dd LC |
1372 | |
1373 | /* Only keep a weak reference to MUTEX so that it's not | |
f57fdf07 LC |
1374 | retained when not referenced elsewhere (bug #27450). |
1375 | The weak pair itself is eventually removed when MUTEX | |
1376 | is unlocked. Note that `t->mutexes' lists mutexes | |
1377 | currently held by T, so it should be small. */ | |
a141db86 AW |
1378 | t->mutexes = scm_cons (scm_make_weak_vector (SCM_INUM1, mutex), |
1379 | t->mutexes); | |
a0faf7dd | 1380 | |
6180e336 | 1381 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
6180e336 | 1382 | } |
adc085f1 JG |
1383 | *ret = 1; |
1384 | break; | |
1385 | } | |
1386 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1387 | { | |
1388 | m->owner = new_owner; | |
1389 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1390 | scm_from_locale_string ("lock obtained on abandoned " | |
1391 | "mutex")); | |
1392 | *ret = 1; | |
1393 | break; | |
1394 | } | |
1395 | else if (scm_is_eq (m->owner, new_owner)) | |
1396 | { | |
1397 | if (m->recursive) | |
1398 | { | |
1399 | m->level++; | |
74926120 | 1400 | *ret = 1; |
adc085f1 JG |
1401 | } |
1402 | else | |
6180e336 | 1403 | { |
adc085f1 JG |
1404 | err = scm_cons (scm_misc_error_key, |
1405 | scm_from_locale_string ("mutex already locked " | |
1406 | "by thread")); | |
1407 | *ret = 0; | |
1408 | } | |
74926120 | 1409 | break; |
adc085f1 | 1410 | } |
9de87eea | 1411 | else |
9de87eea | 1412 | { |
74926120 | 1413 | if (timeout != NULL) |
adc085f1 JG |
1414 | { |
1415 | gettimeofday (¤t_time, NULL); | |
1416 | if (current_time.tv_sec > timeout->tv_sec || | |
1417 | (current_time.tv_sec == timeout->tv_sec && | |
1418 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1419 | { |
adc085f1 JG |
1420 | *ret = 0; |
1421 | break; | |
6180e336 | 1422 | } |
6180e336 | 1423 | } |
37a52039 | 1424 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1425 | scm_i_pthread_mutex_unlock (&m->lock); |
1426 | SCM_TICK; | |
1427 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1428 | } | |
1429 | } | |
1430 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1431 | return err; |
9de87eea MV |
1432 | } |
1433 | ||
6180e336 NJ |
1434 | SCM scm_lock_mutex (SCM mx) |
1435 | { | |
adc085f1 | 1436 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1437 | } |
1438 | ||
adc085f1 JG |
1439 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1440 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1441 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1442 | "blocks until the mutex becomes available. The function returns when " | |
1443 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1444 | "a thread already owns will succeed right away and will not block the " | |
1445 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1446 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1447 | { |
6180e336 NJ |
1448 | SCM exception; |
1449 | int ret = 0; | |
1450 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1451 | |
6180e336 NJ |
1452 | SCM_VALIDATE_MUTEX (1, m); |
1453 | ||
1454 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1455 | { | |
1456 | to_timespec (timeout, &cwaittime); | |
1457 | waittime = &cwaittime; | |
1458 | } | |
1459 | ||
97ec95b7 LC |
1460 | if (!SCM_UNBNDP (owner) && !scm_is_false (owner)) |
1461 | SCM_VALIDATE_THREAD (3, owner); | |
1462 | ||
adc085f1 | 1463 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1464 | if (!scm_is_false (exception)) |
1465 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1466 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1467 | } |
76da80e7 | 1468 | #undef FUNC_NAME |
9bc4701c | 1469 | |
9ec1573d MW |
1470 | static void |
1471 | lock_mutex_return_void (SCM mx) | |
1472 | { | |
1473 | (void) scm_lock_mutex (mx); | |
1474 | } | |
1475 | ||
1476 | static void | |
1477 | unlock_mutex_return_void (SCM mx) | |
1478 | { | |
1479 | (void) scm_unlock_mutex (mx); | |
1480 | } | |
1481 | ||
a4d106c7 | 1482 | void |
661ae7ab | 1483 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1484 | { |
9ec1573d | 1485 | scm_dynwind_unwind_handler_with_scm (unlock_mutex_return_void, mutex, |
661ae7ab | 1486 | SCM_F_WIND_EXPLICITLY); |
9ec1573d | 1487 | scm_dynwind_rewind_handler_with_scm (lock_mutex_return_void, mutex, |
661ae7ab | 1488 | SCM_F_WIND_EXPLICITLY); |
a4d106c7 MV |
1489 | } |
1490 | ||
9bc4701c | 1491 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1492 | (SCM mutex), |
9bc4701c MD |
1493 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1494 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1495 | #define FUNC_NAME s_scm_try_mutex | |
1496 | { | |
6180e336 NJ |
1497 | SCM exception; |
1498 | int ret = 0; | |
1499 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1500 | |
ba1b7223 | 1501 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1502 | |
1503 | to_timespec (scm_from_int(0), &cwaittime); | |
1504 | waittime = &cwaittime; | |
74926120 | 1505 | |
adc085f1 | 1506 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1507 | if (!scm_is_false (exception)) |
1508 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1509 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1510 | } |
1511 | #undef FUNC_NAME | |
76da80e7 | 1512 | |
6180e336 NJ |
1513 | /*** Fat condition variables */ |
1514 | ||
1515 | typedef struct { | |
1516 | scm_i_pthread_mutex_t lock; | |
1517 | SCM waiting; /* the threads waiting for this condition. */ | |
1518 | } fat_cond; | |
1519 | ||
1520 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1521 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1522 | ||
a141db86 AW |
1523 | static void |
1524 | remove_mutex_from_thread (SCM mutex, scm_i_thread *t) | |
1525 | { | |
1526 | SCM walk, prev; | |
1527 | ||
1528 | for (prev = SCM_BOOL_F, walk = t->mutexes; scm_is_pair (walk); | |
1529 | walk = SCM_CDR (walk)) | |
1530 | { | |
1531 | if (scm_is_eq (mutex, scm_c_weak_vector_ref (SCM_CAR (walk), 0))) | |
1532 | { | |
1533 | if (scm_is_pair (prev)) | |
1534 | SCM_SETCDR (prev, SCM_CDR (walk)); | |
1535 | else | |
1536 | t->mutexes = SCM_CDR (walk); | |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | } | |
1541 | ||
6180e336 NJ |
1542 | static int |
1543 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1544 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1545 | { |
7f991c7d | 1546 | SCM owner; |
6180e336 NJ |
1547 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1548 | fat_cond *c = NULL; | |
1549 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1550 | int err = 0, ret = 0; | |
9de87eea MV |
1551 | |
1552 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 | 1553 | |
7f991c7d | 1554 | owner = m->owner; |
adc085f1 | 1555 | |
d31ae2c3 | 1556 | if (!scm_is_eq (owner, t->handle)) |
9bc4701c | 1557 | { |
adc085f1 | 1558 | if (m->level == 0) |
6180e336 NJ |
1559 | { |
1560 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1561 | { |
1562 | scm_i_pthread_mutex_unlock (&m->lock); | |
1563 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1564 | } | |
d31ae2c3 | 1565 | owner = t->handle; |
6180e336 NJ |
1566 | } |
1567 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1568 | { |
1569 | scm_i_pthread_mutex_unlock (&m->lock); | |
1570 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1571 | } | |
6180e336 NJ |
1572 | } |
1573 | ||
1574 | if (! (SCM_UNBNDP (cond))) | |
1575 | { | |
6180e336 NJ |
1576 | c = SCM_CONDVAR_DATA (cond); |
1577 | while (1) | |
1578 | { | |
1579 | int brk = 0; | |
1580 | ||
6180e336 NJ |
1581 | if (m->level > 0) |
1582 | m->level--; | |
adc085f1 | 1583 | if (m->level == 0) |
f57fdf07 LC |
1584 | { |
1585 | /* Change the owner of MUTEX. */ | |
a141db86 | 1586 | remove_mutex_from_thread (mutex, t); |
f57fdf07 LC |
1587 | m->owner = unblock_from_queue (m->waiting); |
1588 | } | |
adc085f1 | 1589 | |
6180e336 | 1590 | t->block_asyncs++; |
74926120 | 1591 | |
d2a51087 NJ |
1592 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1593 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1594 | |
1595 | if (err == 0) | |
1596 | { | |
1597 | ret = 1; | |
1598 | brk = 1; | |
1599 | } | |
1600 | else if (err == ETIMEDOUT) | |
1601 | { | |
1602 | ret = 0; | |
1603 | brk = 1; | |
1604 | } | |
1605 | else if (err != EINTR) | |
74926120 | 1606 | { |
6180e336 | 1607 | errno = err; |
6180e336 | 1608 | scm_syserror (NULL); |
74926120 | 1609 | } |
6180e336 NJ |
1610 | |
1611 | if (brk) | |
1612 | { | |
1613 | if (relock) | |
adc085f1 | 1614 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1615 | t->block_asyncs--; |
6180e336 NJ |
1616 | break; |
1617 | } | |
74926120 | 1618 | |
6180e336 | 1619 | t->block_asyncs--; |
27c6ebcb | 1620 | scm_async_tick (); |
74926120 | 1621 | |
6180e336 NJ |
1622 | scm_remember_upto_here_2 (cond, mutex); |
1623 | ||
1624 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1625 | } | |
9bc4701c | 1626 | } |
9de87eea | 1627 | else |
6180e336 NJ |
1628 | { |
1629 | if (m->level > 0) | |
1630 | m->level--; | |
74926120 | 1631 | if (m->level == 0) |
f57fdf07 LC |
1632 | { |
1633 | /* Change the owner of MUTEX. */ | |
a141db86 | 1634 | remove_mutex_from_thread (mutex, t); |
f57fdf07 LC |
1635 | m->owner = unblock_from_queue (m->waiting); |
1636 | } | |
74926120 | 1637 | |
6180e336 NJ |
1638 | scm_i_pthread_mutex_unlock (&m->lock); |
1639 | ret = 1; | |
1640 | } | |
9de87eea | 1641 | |
6180e336 | 1642 | return ret; |
9bc4701c | 1643 | } |
9bc4701c | 1644 | |
6180e336 NJ |
1645 | SCM scm_unlock_mutex (SCM mx) |
1646 | { | |
1647 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1648 | } |
9bc4701c | 1649 | |
6180e336 NJ |
1650 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1651 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1652 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1653 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1654 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1655 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1656 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1657 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1658 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1659 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1660 | { |
6180e336 NJ |
1661 | scm_t_timespec cwaittime, *waittime = NULL; |
1662 | ||
9bc4701c | 1663 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1664 | if (! (SCM_UNBNDP (cond))) |
1665 | { | |
1666 | SCM_VALIDATE_CONDVAR (2, cond); | |
1667 | ||
1668 | if (! (SCM_UNBNDP (timeout))) | |
1669 | { | |
1670 | to_timespec (timeout, &cwaittime); | |
1671 | waittime = &cwaittime; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1676 | } |
1677 | #undef FUNC_NAME | |
1678 | ||
6180e336 NJ |
1679 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1680 | (SCM obj), | |
1681 | "Return @code{#t} if @var{obj} is a mutex.") | |
1682 | #define FUNC_NAME s_scm_mutex_p | |
1683 | { | |
1684 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1685 | } | |
74926120 | 1686 | #undef FUNC_NAME |
9de87eea MV |
1687 | |
1688 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1689 | (SCM mx), | |
1690 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1691 | #define FUNC_NAME s_scm_mutex_owner | |
1692 | { | |
adc085f1 JG |
1693 | SCM owner; |
1694 | fat_mutex *m = NULL; | |
1695 | ||
9de87eea | 1696 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1697 | m = SCM_MUTEX_DATA (mx); |
1698 | scm_i_pthread_mutex_lock (&m->lock); | |
1699 | owner = m->owner; | |
1700 | scm_i_pthread_mutex_unlock (&m->lock); | |
1701 | ||
1702 | return owner; | |
9de87eea MV |
1703 | } |
1704 | #undef FUNC_NAME | |
1705 | ||
1706 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1707 | (SCM mx), | |
adc085f1 | 1708 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1709 | #define FUNC_NAME s_scm_mutex_level |
1710 | { | |
1711 | SCM_VALIDATE_MUTEX (1, mx); | |
1712 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1713 | } | |
1714 | #undef FUNC_NAME | |
1715 | ||
adc085f1 JG |
1716 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1717 | (SCM mx), | |
1718 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1719 | #define FUNC_NAME s_scm_mutex_locked_p | |
1720 | { | |
1721 | SCM_VALIDATE_MUTEX (1, mx); | |
1722 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1723 | } | |
1724 | #undef FUNC_NAME | |
9de87eea | 1725 | |
9de87eea MV |
1726 | static int |
1727 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1728 | { | |
1729 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1730 | scm_puts ("#<condition-variable ", port); | |
1731 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1732 | scm_puts (">", port); | |
1733 | return 1; | |
1734 | } | |
9bc4701c | 1735 | |
d823b11b MV |
1736 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1737 | (void), | |
1738 | "Make a new condition variable.") | |
1739 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1740 | { |
9de87eea MV |
1741 | fat_cond *c; |
1742 | SCM cv; | |
1743 | ||
1744 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1745 | c->waiting = SCM_EOL; |
1746 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1747 | c->waiting = make_queue (); | |
d823b11b | 1748 | return cv; |
5f05c406 | 1749 | } |
d823b11b | 1750 | #undef FUNC_NAME |
5f05c406 | 1751 | |
d823b11b MV |
1752 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1753 | (SCM cv, SCM mx, SCM t), | |
1754 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1755 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1756 | "is locked again when this function returns. When @var{time} is given, " | |
1757 | "it specifies a point in time where the waiting should be aborted. It " | |
1758 | "can be either a integer as returned by @code{current-time} or a pair " | |
1759 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1760 | "mutex is locked and @code{#f} is returned. When the condition " | |
1761 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1762 | "is returned. ") | |
1763 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1764 | { |
9de87eea | 1765 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1766 | |
1767 | SCM_VALIDATE_CONDVAR (1, cv); | |
1768 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1769 | |
d823b11b MV |
1770 | if (!SCM_UNBNDP (t)) |
1771 | { | |
6180e336 | 1772 | to_timespec (t, &waittime); |
9de87eea | 1773 | waitptr = &waittime; |
d823b11b MV |
1774 | } |
1775 | ||
2a1d0688 | 1776 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1777 | } |
d823b11b | 1778 | #undef FUNC_NAME |
5f05c406 | 1779 | |
9de87eea MV |
1780 | static void |
1781 | fat_cond_signal (fat_cond *c) | |
1782 | { | |
9de87eea | 1783 | unblock_from_queue (c->waiting); |
9de87eea MV |
1784 | } |
1785 | ||
d823b11b MV |
1786 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1787 | (SCM cv), | |
1788 | "Wake up one thread that is waiting for @var{cv}") | |
1789 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1790 | { |
d823b11b | 1791 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1792 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1793 | return SCM_BOOL_T; |
5f05c406 | 1794 | } |
d823b11b | 1795 | #undef FUNC_NAME |
5f05c406 | 1796 | |
9de87eea MV |
1797 | static void |
1798 | fat_cond_broadcast (fat_cond *c) | |
1799 | { | |
9de87eea MV |
1800 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1801 | ; | |
9de87eea MV |
1802 | } |
1803 | ||
d823b11b MV |
1804 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1805 | (SCM cv), | |
1806 | "Wake up all threads that are waiting for @var{cv}. ") | |
1807 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1808 | { |
d823b11b | 1809 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1810 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1811 | return SCM_BOOL_T; |
5f05c406 | 1812 | } |
d823b11b | 1813 | #undef FUNC_NAME |
5f05c406 | 1814 | |
6180e336 NJ |
1815 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1816 | (SCM obj), | |
1817 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1818 | #define FUNC_NAME s_scm_condition_variable_p | |
1819 | { | |
1820 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1821 | } | |
1822 | #undef FUNC_NAME | |
1823 | ||
6087fad9 | 1824 | |
8c2b3143 | 1825 | \f |
d823b11b MV |
1826 | /*** Select */ |
1827 | ||
8c2b3143 LC |
1828 | struct select_args |
1829 | { | |
1830 | int nfds; | |
1831 | SELECT_TYPE *read_fds; | |
1832 | SELECT_TYPE *write_fds; | |
1833 | SELECT_TYPE *except_fds; | |
1834 | struct timeval *timeout; | |
1835 | ||
1836 | int result; | |
1837 | int errno_value; | |
1838 | }; | |
1839 | ||
1840 | static void * | |
1841 | do_std_select (void *args) | |
1842 | { | |
1843 | struct select_args *select_args; | |
1844 | ||
1845 | select_args = (struct select_args *) args; | |
1846 | ||
1847 | select_args->result = | |
1848 | select (select_args->nfds, | |
1849 | select_args->read_fds, select_args->write_fds, | |
1850 | select_args->except_fds, select_args->timeout); | |
1851 | select_args->errno_value = errno; | |
1852 | ||
1853 | return NULL; | |
1854 | } | |
1855 | ||
911782b7 | 1856 | int |
9de87eea MV |
1857 | scm_std_select (int nfds, |
1858 | SELECT_TYPE *readfds, | |
1859 | SELECT_TYPE *writefds, | |
1860 | SELECT_TYPE *exceptfds, | |
1861 | struct timeval *timeout) | |
1862 | { | |
1863 | fd_set my_readfds; | |
1864 | int res, eno, wakeup_fd; | |
1865 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1866 | struct select_args args; |
9de87eea MV |
1867 | |
1868 | if (readfds == NULL) | |
1869 | { | |
1870 | FD_ZERO (&my_readfds); | |
1871 | readfds = &my_readfds; | |
1872 | } | |
1873 | ||
1874 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1875 | SCM_TICK; | |
1876 | ||
1877 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1878 | FD_SET (wakeup_fd, readfds); |
1879 | if (wakeup_fd >= nfds) | |
1880 | nfds = wakeup_fd+1; | |
9de87eea | 1881 | |
8c2b3143 LC |
1882 | args.nfds = nfds; |
1883 | args.read_fds = readfds; | |
1884 | args.write_fds = writefds; | |
1885 | args.except_fds = exceptfds; | |
1886 | args.timeout = timeout; | |
1887 | ||
1888 | /* Explicitly cooperate with the GC. */ | |
1889 | scm_without_guile (do_std_select, &args); | |
1890 | ||
1891 | res = args.result; | |
1892 | eno = args.errno_value; | |
1893 | ||
1894 | t->sleep_fd = -1; | |
9de87eea MV |
1895 | scm_i_reset_sleep (t); |
1896 | ||
1897 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1898 | { | |
1899 | char dummy; | |
634aa8de LC |
1900 | full_read (wakeup_fd, &dummy, 1); |
1901 | ||
9de87eea MV |
1902 | FD_CLR (wakeup_fd, readfds); |
1903 | res -= 1; | |
1904 | if (res == 0) | |
1905 | { | |
1906 | eno = EINTR; | |
1907 | res = -1; | |
1908 | } | |
1909 | } | |
d823b11b MV |
1910 | errno = eno; |
1911 | return res; | |
5f05c406 MV |
1912 | } |
1913 | ||
9de87eea | 1914 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1915 | |
9de87eea | 1916 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1917 | |
2956b071 LC |
1918 | /* It seems reasonable to not run procedures related to mutex and condition |
1919 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1920 | without it, and (ii) the only potential gain would be GC latency. See | |
1921 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1922 | for a discussion of the pros and cons. */ | |
1923 | ||
9bc4701c | 1924 | int |
9de87eea | 1925 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1926 | { |
9de87eea | 1927 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1928 | return res; |
1929 | } | |
1930 | ||
9de87eea | 1931 | static void |
2b829bbb | 1932 | do_unlock (void *data) |
28d52ebb | 1933 | { |
9de87eea | 1934 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1935 | } |
1936 | ||
1937 | void | |
661ae7ab | 1938 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1939 | { |
9de87eea | 1940 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1941 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1942 | } |
1943 | ||
9bc4701c | 1944 | int |
9de87eea | 1945 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1946 | { |
4cf72f0b LC |
1947 | int res; |
1948 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1949 | ||
1950 | t->held_mutex = mutex; | |
1951 | res = scm_i_pthread_cond_wait (cond, mutex); | |
1952 | t->held_mutex = NULL; | |
1953 | ||
9bc4701c MD |
1954 | return res; |
1955 | } | |
9bc4701c | 1956 | |
76da80e7 | 1957 | int |
9de87eea MV |
1958 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1959 | scm_i_pthread_mutex_t *mutex, | |
1960 | const scm_t_timespec *wt) | |
76da80e7 | 1961 | { |
4cf72f0b LC |
1962 | int res; |
1963 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1964 | ||
1965 | t->held_mutex = mutex; | |
1966 | res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1967 | t->held_mutex = NULL; | |
1968 | ||
9de87eea | 1969 | return res; |
76da80e7 MV |
1970 | } |
1971 | ||
9de87eea | 1972 | #endif |
76da80e7 | 1973 | |
d823b11b | 1974 | unsigned long |
9de87eea | 1975 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1976 | { |
d823b11b MV |
1977 | struct timeval tv; |
1978 | tv.tv_usec = usecs % 1000000; | |
1979 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1980 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1981 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1982 | } |
1983 | ||
9de87eea MV |
1984 | unsigned int |
1985 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1986 | { |
d823b11b MV |
1987 | struct timeval tv; |
1988 | tv.tv_usec = 0; | |
1989 | tv.tv_sec = secs; | |
9de87eea | 1990 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1991 | return tv.tv_sec; |
6c214b62 MD |
1992 | } |
1993 | ||
d823b11b MV |
1994 | /*** Misc */ |
1995 | ||
1996 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1997 | (void), | |
1998 | "Return the thread that called this function.") | |
1999 | #define FUNC_NAME s_scm_current_thread | |
2000 | { | |
9de87eea | 2001 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
2002 | } |
2003 | #undef FUNC_NAME | |
2004 | ||
9de87eea MV |
2005 | static SCM |
2006 | scm_c_make_list (size_t n, SCM fill) | |
2007 | { | |
2008 | SCM res = SCM_EOL; | |
2009 | while (n-- > 0) | |
2010 | res = scm_cons (fill, res); | |
2011 | return res; | |
2012 | } | |
2013 | ||
d823b11b MV |
2014 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
2015 | (void), | |
2016 | "Return a list of all threads.") | |
9bc4701c | 2017 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 2018 | { |
9de87eea MV |
2019 | /* We can not allocate while holding the thread_admin_mutex because |
2020 | of the way GC is done. | |
2021 | */ | |
2022 | int n = thread_count; | |
2023 | scm_i_thread *t; | |
2024 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 2025 | |
9de87eea MV |
2026 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
2027 | l = &list; | |
2028 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
2029 | { | |
2e77f720 LC |
2030 | if (t != scm_i_signal_delivery_thread) |
2031 | { | |
2032 | SCM_SETCAR (*l, t->handle); | |
2033 | l = SCM_CDRLOC (*l); | |
2034 | } | |
9de87eea MV |
2035 | n--; |
2036 | } | |
2037 | *l = SCM_EOL; | |
2038 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
2039 | return list; | |
d823b11b | 2040 | } |
9de87eea | 2041 | #undef FUNC_NAME |
d823b11b MV |
2042 | |
2043 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
2044 | (SCM thread), | |
2045 | "Return @code{#t} iff @var{thread} has exited.\n") | |
2046 | #define FUNC_NAME s_scm_thread_exited_p | |
2047 | { | |
7888309b | 2048 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
2049 | } |
2050 | #undef FUNC_NAME | |
2051 | ||
911782b7 | 2052 | int |
d823b11b MV |
2053 | scm_c_thread_exited_p (SCM thread) |
2054 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 2055 | { |
9de87eea | 2056 | scm_i_thread *t; |
d823b11b | 2057 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 2058 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 2059 | return t->exited; |
5f05c406 | 2060 | } |
d823b11b | 2061 | #undef FUNC_NAME |
5f05c406 | 2062 | |
d20912e6 LC |
2063 | SCM_DEFINE (scm_total_processor_count, "total-processor-count", 0, 0, 0, |
2064 | (void), | |
2065 | "Return the total number of processors of the machine, which\n" | |
2066 | "is guaranteed to be at least 1. A ``processor'' here is a\n" | |
2067 | "thread execution unit, which can be either:\n\n" | |
2068 | "@itemize\n" | |
2069 | "@item an execution core in a (possibly multi-core) chip, in a\n" | |
2070 | " (possibly multi- chip) module, in a single computer, or\n" | |
2071 | "@item a thread execution unit inside a core in the case of\n" | |
2072 | " @dfn{hyper-threaded} CPUs.\n" | |
2073 | "@end itemize\n\n" | |
2074 | "Which of the two definitions is used, is unspecified.\n") | |
2075 | #define FUNC_NAME s_scm_total_processor_count | |
2076 | { | |
2077 | return scm_from_ulong (num_processors (NPROC_ALL)); | |
2078 | } | |
2079 | #undef FUNC_NAME | |
2080 | ||
2081 | SCM_DEFINE (scm_current_processor_count, "current-processor-count", 0, 0, 0, | |
2082 | (void), | |
2083 | "Like @code{total-processor-count}, but return the number of\n" | |
2084 | "processors available to the current process. See\n" | |
2085 | "@code{setaffinity} and @code{getaffinity} for more\n" | |
2086 | "information.\n") | |
2087 | #define FUNC_NAME s_scm_current_processor_count | |
2088 | { | |
2089 | return scm_from_ulong (num_processors (NPROC_CURRENT)); | |
2090 | } | |
2091 | #undef FUNC_NAME | |
2092 | ||
2093 | ||
2094 | \f | |
2095 | ||
9de87eea | 2096 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
2097 | static int threads_initialized_p = 0; |
2098 | ||
9bc4701c | 2099 | |
a4d106c7 MV |
2100 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2101 | */ | |
d1138028 | 2102 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 | 2103 | |
661ae7ab | 2104 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2105 | |
9bc4701c | 2106 | void |
661ae7ab | 2107 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2108 | { |
a4d106c7 | 2109 | if (scm_is_false (mutex)) |
661ae7ab MV |
2110 | mutex = dynwind_critical_section_mutex; |
2111 | scm_dynwind_lock_mutex (mutex); | |
2112 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2113 | } |
2114 | ||
2115 | /*** Initialization */ | |
2116 | ||
9de87eea MV |
2117 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2118 | ||
d1138028 MV |
2119 | #if SCM_USE_PTHREAD_THREADS |
2120 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2121 | #endif | |
2122 | ||
9de87eea | 2123 | void |
12c1d861 | 2124 | scm_threads_prehistory (void *base) |
9de87eea | 2125 | { |
d1138028 MV |
2126 | #if SCM_USE_PTHREAD_THREADS |
2127 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2128 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2129 | PTHREAD_MUTEX_RECURSIVE); | |
2130 | #endif | |
2131 | ||
2132 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2133 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2134 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2135 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2136 | |
12c1d861 | 2137 | guilify_self_1 ((struct GC_stack_base *) base); |
9bc4701c MD |
2138 | } |
2139 | ||
d823b11b MV |
2140 | scm_t_bits scm_tc16_thread; |
2141 | scm_t_bits scm_tc16_mutex; | |
2142 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2143 | |
7bfd3b9e | 2144 | void |
9de87eea | 2145 | scm_init_threads () |
7bfd3b9e | 2146 | { |
9de87eea | 2147 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2148 | scm_set_smob_print (scm_tc16_thread, thread_print); |
d823b11b | 2149 | |
9de87eea | 2150 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2151 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2152 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2153 | |
9de87eea MV |
2154 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2155 | sizeof (fat_cond)); | |
9de87eea | 2156 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
d823b11b | 2157 | |
9de87eea MV |
2158 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2159 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2160 | threads_initialized_p = 1; |
a4d106c7 | 2161 | |
f39448c5 | 2162 | dynwind_critical_section_mutex = scm_make_recursive_mutex (); |
7bfd3b9e | 2163 | } |
89e00824 | 2164 | |
5f05c406 | 2165 | void |
9de87eea | 2166 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2167 | { |
9de87eea | 2168 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
f39448c5 | 2169 | scm_i_default_dynamic_state = state; |
5f05c406 MV |
2170 | } |
2171 | ||
d823b11b | 2172 | void |
9de87eea | 2173 | scm_init_thread_procs () |
d823b11b | 2174 | { |
9de87eea | 2175 | #include "libguile/threads.x" |
d823b11b MV |
2176 | } |
2177 | ||
3c13664e LC |
2178 | \f |
2179 | /* IA64-specific things. */ | |
2180 | ||
2181 | #ifdef __ia64__ | |
2182 | # ifdef __hpux | |
2183 | # include <sys/param.h> | |
2184 | # include <sys/pstat.h> | |
2185 | void * | |
2186 | scm_ia64_register_backing_store_base (void) | |
2187 | { | |
2188 | struct pst_vm_status vm_status; | |
2189 | int i = 0; | |
2190 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2191 | if (vm_status.pst_type == PS_RSESTACK) | |
2192 | return (void *) vm_status.pst_vaddr; | |
2193 | abort (); | |
2194 | } | |
2195 | void * | |
2196 | scm_ia64_ar_bsp (const void *ctx) | |
2197 | { | |
2198 | uint64_t bsp; | |
2199 | __uc_get_ar_bsp (ctx, &bsp); | |
2200 | return (void *) bsp; | |
2201 | } | |
2202 | # endif /* hpux */ | |
2203 | # ifdef linux | |
2204 | # include <ucontext.h> | |
2205 | void * | |
2206 | scm_ia64_register_backing_store_base (void) | |
2207 | { | |
2208 | extern void *__libc_ia64_register_backing_store_base; | |
2209 | return __libc_ia64_register_backing_store_base; | |
2210 | } | |
2211 | void * | |
2212 | scm_ia64_ar_bsp (const void *opaque) | |
2213 | { | |
2214 | const ucontext_t *ctx = opaque; | |
2215 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2216 | } | |
2217 | # endif /* linux */ | |
2218 | #endif /* __ia64__ */ | |
2219 | ||
2220 | ||
89e00824 ML |
2221 | /* |
2222 | Local Variables: | |
2223 | c-file-style: "gnu" | |
2224 | End: | |
2225 | */ |