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