Commit | Line | Data |
---|---|---|
2b829bbb | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
7bfd3b9e | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
73be1d9e MV |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
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 | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
7bfd3b9e JB |
19 | \f |
20 | ||
9de87eea | 21 | #define _GNU_SOURCE |
76da80e7 | 22 | |
1810dc4e RB |
23 | #include "libguile/_scm.h" |
24 | ||
fcc5d734 | 25 | #if HAVE_UNISTD_H |
d823b11b | 26 | #include <unistd.h> |
fcc5d734 | 27 | #endif |
d823b11b MV |
28 | #include <stdio.h> |
29 | #include <assert.h> | |
8ab3d8a0 KR |
30 | |
31 | #ifdef HAVE_STRING_H | |
32 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
33 | #endif | |
34 | ||
fcc5d734 | 35 | #if HAVE_SYS_TIME_H |
d823b11b | 36 | #include <sys/time.h> |
fcc5d734 | 37 | #endif |
5f05c406 | 38 | |
d823b11b MV |
39 | #include "libguile/validate.h" |
40 | #include "libguile/root.h" | |
41 | #include "libguile/eval.h" | |
42 | #include "libguile/async.h" | |
43 | #include "libguile/ports.h" | |
44 | #include "libguile/threads.h" | |
a0599745 | 45 | #include "libguile/dynwind.h" |
d823b11b | 46 | #include "libguile/iselect.h" |
9de87eea MV |
47 | #include "libguile/fluids.h" |
48 | #include "libguile/continuations.h" | |
2b829bbb | 49 | #include "libguile/gc.h" |
9de87eea | 50 | #include "libguile/init.h" |
7bfd3b9e | 51 | |
ecc9f40f MV |
52 | #ifdef __MINGW32__ |
53 | #ifndef ETIMEDOUT | |
54 | # define ETIMEDOUT WSAETIMEDOUT | |
55 | #endif | |
56 | # include <fcntl.h> | |
57 | # include <process.h> | |
58 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
59 | #endif /* __MINGW32__ */ | |
60 | ||
d823b11b | 61 | /*** Queues */ |
7bfd3b9e | 62 | |
9de87eea MV |
63 | /* Make an empty queue data structure. |
64 | */ | |
d823b11b MV |
65 | static SCM |
66 | make_queue () | |
67 | { | |
68 | return scm_cons (SCM_EOL, SCM_EOL); | |
69 | } | |
7bfd3b9e | 70 | |
9de87eea MV |
71 | /* Put T at the back of Q and return a handle that can be used with |
72 | remqueue to remove T from Q again. | |
73 | */ | |
d823b11b MV |
74 | static SCM |
75 | enqueue (SCM q, SCM t) | |
76 | { | |
77 | SCM c = scm_cons (t, SCM_EOL); | |
d2e53ed6 | 78 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
79 | SCM_SETCDR (q, c); |
80 | else | |
81 | SCM_SETCDR (SCM_CAR (q), c); | |
82 | SCM_SETCAR (q, c); | |
83 | return c; | |
84 | } | |
7bfd3b9e | 85 | |
9de87eea MV |
86 | /* Remove the element that the handle C refers to from the queue Q. C |
87 | must have been returned from a call to enqueue. The return value | |
88 | is zero when the element referred to by C has already been removed. | |
89 | Otherwise, 1 is returned. | |
90 | */ | |
91 | static int | |
d823b11b MV |
92 | remqueue (SCM q, SCM c) |
93 | { | |
94 | SCM p, prev = q; | |
d2e53ed6 | 95 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 96 | { |
bc36d050 | 97 | if (scm_is_eq (p, c)) |
d823b11b | 98 | { |
bc36d050 | 99 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
100 | SCM_SETCAR (q, SCM_CDR (c)); |
101 | SCM_SETCDR (prev, SCM_CDR (c)); | |
9de87eea | 102 | return 1; |
d823b11b MV |
103 | } |
104 | prev = p; | |
105 | } | |
9de87eea | 106 | return 0; |
d823b11b MV |
107 | } |
108 | ||
9de87eea MV |
109 | /* Remove the front-most element from the queue Q and return it. |
110 | Return SCM_BOOL_F when Q is empty. | |
111 | */ | |
d823b11b MV |
112 | static SCM |
113 | dequeue (SCM q) | |
114 | { | |
115 | SCM c = SCM_CDR (q); | |
d2e53ed6 | 116 | if (scm_is_null (c)) |
d823b11b MV |
117 | return SCM_BOOL_F; |
118 | else | |
119 | { | |
120 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 121 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
122 | SCM_SETCAR (q, SCM_EOL); |
123 | return SCM_CAR (c); | |
124 | } | |
125 | } | |
7bfd3b9e | 126 | |
9de87eea | 127 | /*** Thread smob routines */ |
76da80e7 | 128 | |
d823b11b MV |
129 | static SCM |
130 | thread_mark (SCM obj) | |
131 | { | |
9de87eea | 132 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
d823b11b | 133 | scm_gc_mark (t->result); |
9de87eea MV |
134 | scm_gc_mark (t->join_queue); |
135 | scm_gc_mark (t->dynwinds); | |
136 | scm_gc_mark (t->active_asyncs); | |
9de87eea MV |
137 | scm_gc_mark (t->continuation_root); |
138 | return t->dynamic_state; | |
d823b11b MV |
139 | } |
140 | ||
141 | static int | |
142 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
143 | { | |
9de87eea | 144 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
d823b11b | 145 | scm_puts ("#<thread ", port); |
9de87eea | 146 | scm_uintprint ((size_t)t->pthread, 10, port); |
1b92fb6b | 147 | scm_puts (" (", port); |
0345e278 | 148 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 149 | scm_puts (")>", port); |
d823b11b MV |
150 | return 1; |
151 | } | |
152 | ||
153 | static size_t | |
154 | thread_free (SCM obj) | |
155 | { | |
9de87eea MV |
156 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
157 | assert (t->exited); | |
d823b11b MV |
158 | scm_gc_free (t, sizeof (*t), "thread"); |
159 | return 0; | |
160 | } | |
161 | ||
9de87eea | 162 | /*** Blocking on queues. */ |
f7eca35d | 163 | |
9de87eea MV |
164 | /* See also scm_i_queue_async_cell for how such a block is |
165 | interrputed. | |
166 | */ | |
d823b11b | 167 | |
9de87eea MV |
168 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
169 | be woken up by a call to 'unblock_from_queue', or to be | |
170 | interrupted. Upon return of this function, the current thread is | |
171 | no longer on QUEUE, even when the sleep has been interrupted. | |
172 | ||
173 | The QUEUE data structure is assumed to be protected by MUTEX and | |
174 | the caller of block_self must hold MUTEX. It will be atomically | |
175 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
176 | ||
177 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
178 | as MUTEX is needed. | |
179 | ||
180 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
181 | ||
182 | The return value of block_self is an errno value. It will be zero | |
183 | when the sleep has been successfully completed by a call to | |
184 | unblock_from_queue, EINTR when it has been interrupted by the | |
185 | delivery of a system async, and ETIMEDOUT when the timeout has | |
186 | expired. | |
187 | ||
188 | The system asyncs themselves are not executed by block_self. | |
189 | */ | |
190 | static int | |
191 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
192 | const scm_t_timespec *waittime) | |
76da80e7 | 193 | { |
9de87eea MV |
194 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
195 | SCM q_handle; | |
196 | int err; | |
197 | ||
198 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
199 | err = EINTR; | |
200 | else | |
201 | { | |
202 | t->block_asyncs++; | |
203 | q_handle = enqueue (queue, t->handle); | |
204 | if (waittime == NULL) | |
205 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
206 | else | |
207 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
208 | ||
209 | /* When we are still on QUEUE, we have been interrupted. We | |
210 | report this only when no other error (such as a timeout) has | |
211 | happened above. | |
212 | */ | |
213 | if (remqueue (queue, q_handle) && err == 0) | |
214 | err = EINTR; | |
215 | t->block_asyncs--; | |
216 | scm_i_reset_sleep (t); | |
217 | } | |
218 | ||
219 | return err; | |
76da80e7 | 220 | } |
9de87eea MV |
221 | |
222 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
223 | the mutex that protects QUEUE. The awoken thread is returned, or | |
224 | #f when the queue was empty. | |
225 | */ | |
226 | static SCM | |
227 | unblock_from_queue (SCM queue) | |
228 | { | |
229 | SCM thread = dequeue (queue); | |
230 | if (scm_is_true (thread)) | |
231 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
232 | return thread; | |
233 | } | |
234 | ||
235 | /* Getting into and out of guile mode. | |
236 | */ | |
237 | ||
98648121 MV |
238 | /* Ken Raeburn observes that the implementation of suspend and resume |
239 | (and the things that build on top of them) are very likely not | |
240 | correct (see below). We will need fix this eventually, and that's | |
241 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
242 | ||
243 | Ken writes: | |
244 | ||
245 | Consider this sequence: | |
246 | ||
247 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
248 | through scm_leave_guile), which does this: | |
249 | ||
250 | // record top of stack for the GC | |
251 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
252 | var 't' | |
253 | // save registers. | |
254 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
255 | setjmp (t->regs); // here's most of the magic | |
256 | ||
257 | ... and returns. | |
258 | ||
259 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
260 | a caller-saved register R, and it's the only reference to the object | |
261 | currently. | |
262 | ||
263 | The compiler wants to use R in suspend, so it pushes the current | |
264 | value, X, into a stack slot which will be reloaded on exit from | |
265 | suspend; then it loads stuff into R and goes about its business. The | |
266 | setjmp call saves (some of) the current registers, including R, which | |
267 | no longer contains X. (This isn't a problem for a normal | |
268 | setjmp/longjmp situation, where longjmp would be called before | |
269 | setjmp's caller returns; the old value for X would be loaded back from | |
270 | the stack after the longjmp, before the function returned.) | |
271 | ||
272 | So, suspend returns, loading X back into R (and invalidating the jump | |
273 | buffer) in the process. The caller foo then goes off and calls a | |
274 | bunch of other functions out of Guile mode, occasionally storing X on | |
275 | the stack again, but, say, much deeper on the stack than suspend's | |
276 | stack frame went, and the stack slot where suspend had written X has | |
277 | long since been overwritten with other values. | |
278 | ||
279 | Okay, nothing actively broken so far. Now, let garbage collection | |
280 | run, triggered by another thread. | |
281 | ||
282 | The thread calling foo is out of Guile mode at the time, so the | |
283 | garbage collector just scans a range of stack addresses. Too bad that | |
284 | X isn't stored there. So the pointed-to storage goes onto the free | |
285 | list, and I think you can see where things go from there. | |
286 | ||
287 | Is there anything I'm missing that'll prevent this scenario from | |
288 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
289 | don't have many local variables, so they probably won't need to save | |
290 | any registers on most systems, so we hope everything will wind up in | |
291 | the jump buffer and we'll just get away with it"? | |
292 | ||
293 | (And, going the other direction, if scm_leave_guile and suspend push | |
294 | the stack pointer over onto a new page, and foo doesn't make further | |
295 | function calls and thus the stack pointer no longer includes that | |
296 | page, are we guaranteed that the kernel cannot release the now-unused | |
297 | stack page that contains the top-of-stack pointer we just saved? I | |
298 | don't know if any OS actually does that. If it does, we could get | |
299 | faults in garbage collection.) | |
300 | ||
301 | I don't think scm_without_guile has to have this problem, as it gets | |
302 | more control over the stack handling -- but it should call setjmp | |
303 | itself. I'd probably try something like: | |
304 | ||
305 | // record top of stack for the GC | |
306 | t->top = SCM_STACK_PTR (&t); | |
307 | // save registers. | |
308 | SCM_FLUSH_REGISTER_WINDOWS; | |
309 | setjmp (t->regs); | |
310 | res = func(data); | |
311 | scm_enter_guile (t); | |
312 | ||
313 | ... though even that's making some assumptions about the stack | |
314 | ordering of local variables versus caller-saved registers. | |
315 | ||
316 | For something like scm_leave_guile to work, I don't think it can just | |
317 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
318 | on the stack state at the point when the jump buffer was initialized, | |
319 | together, would work fine, but I think then we're talking about macros | |
320 | invoking setjmp in the caller's stack frame, and requiring that the | |
321 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
322 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
323 | in a function. (In fact, the pthread ones have to be paired up | |
324 | syntactically, as if they might expand to a compound statement | |
325 | incorporating the user's code, and invoking a compiler's | |
326 | exception-handling primitives. Which might be something to think | |
327 | about for cases where Guile is used with C++ exceptions or | |
328 | pthread_cancel.) | |
329 | */ | |
330 | ||
9de87eea MV |
331 | scm_i_pthread_key_t scm_i_thread_key; |
332 | ||
d823b11b | 333 | static void |
9de87eea | 334 | resume (scm_i_thread *t) |
d823b11b | 335 | { |
d823b11b | 336 | t->top = NULL; |
9bc4701c MD |
337 | if (t->clear_freelists_p) |
338 | { | |
339 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
340 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
341 | t->clear_freelists_p = 0; | |
342 | } | |
d823b11b MV |
343 | } |
344 | ||
98648121 MV |
345 | typedef void* scm_t_guile_ticket; |
346 | ||
347 | static void | |
9de87eea | 348 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 349 | { |
9de87eea MV |
350 | scm_i_thread *t = (scm_i_thread *)ticket; |
351 | if (t) | |
352 | { | |
353 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
354 | resume (t); | |
355 | } | |
d823b11b MV |
356 | } |
357 | ||
9de87eea MV |
358 | static scm_i_thread * |
359 | suspend (void) | |
d823b11b | 360 | { |
9de87eea | 361 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
362 | |
363 | /* record top of stack for the GC */ | |
9de87eea | 364 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
365 | /* save registers. */ |
366 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
367 | setjmp (t->regs); |
368 | return t; | |
d823b11b MV |
369 | } |
370 | ||
98648121 | 371 | static scm_t_guile_ticket |
9de87eea | 372 | scm_leave_guile () |
d823b11b | 373 | { |
9de87eea MV |
374 | scm_i_thread *t = suspend (); |
375 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
376 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
377 | } |
378 | ||
9de87eea MV |
379 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
380 | static scm_i_thread *all_threads = NULL; | |
381 | static int thread_count; | |
382 | ||
383 | static SCM scm_i_default_dynamic_state; | |
384 | ||
385 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 386 | */ |
9de87eea MV |
387 | static void |
388 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 389 | { |
9de87eea MV |
390 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
391 | ||
392 | t->pthread = scm_i_pthread_self (); | |
393 | t->handle = SCM_BOOL_F; | |
394 | t->result = SCM_BOOL_F; | |
395 | t->join_queue = SCM_EOL; | |
396 | t->dynamic_state = SCM_BOOL_F; | |
397 | t->dynwinds = SCM_EOL; | |
398 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
399 | t->block_asyncs = 1; |
400 | t->pending_asyncs = 1; | |
401 | t->last_debug_frame = NULL; | |
402 | t->base = base; | |
0c97d7dd | 403 | t->continuation_root = SCM_EOL; |
9de87eea MV |
404 | t->continuation_base = base; |
405 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
406 | t->sleep_mutex = NULL; | |
407 | t->sleep_object = SCM_BOOL_F; | |
408 | t->sleep_fd = -1; | |
0c97d7dd | 409 | /* XXX - check for errors. */ |
9de87eea MV |
410 | pipe (t->sleep_pipe); |
411 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
412 | t->clear_freelists_p = 0; | |
1a8fdd7e | 413 | t->gc_running_p = 0; |
9de87eea MV |
414 | t->exited = 0; |
415 | ||
416 | t->freelist = SCM_EOL; | |
417 | t->freelist2 = SCM_EOL; | |
418 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
419 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
420 | ||
421 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
422 | ||
423 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
424 | ||
425 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
426 | t->next_thread = all_threads; | |
427 | all_threads = t; | |
428 | thread_count++; | |
429 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
430 | } |
431 | ||
9de87eea | 432 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 433 | */ |
9de87eea MV |
434 | static void |
435 | guilify_self_2 (SCM parent) | |
d823b11b | 436 | { |
9de87eea MV |
437 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
438 | ||
439 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
440 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
441 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
442 | t->continuation_base = t->base; | |
443 | ||
444 | if (scm_is_true (parent)) | |
445 | t->dynamic_state = scm_make_dynamic_state (parent); | |
446 | else | |
447 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
448 | ||
449 | t->join_queue = make_queue (); | |
450 | t->block_asyncs = 0; | |
d823b11b MV |
451 | } |
452 | ||
9de87eea | 453 | /* Perform thread tear-down, in guile mode. |
d823b11b | 454 | */ |
9de87eea MV |
455 | static void * |
456 | do_thread_exit (void *v) | |
457 | { | |
0c97d7dd | 458 | scm_i_thread *t = (scm_i_thread *)v; |
9de87eea MV |
459 | |
460 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
461 | ||
462 | t->exited = 1; | |
0c97d7dd MV |
463 | close (t->sleep_pipe[0]); |
464 | close (t->sleep_pipe[1]); | |
9de87eea MV |
465 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
466 | ; | |
9de87eea MV |
467 | |
468 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
469 | return NULL; | |
470 | } | |
471 | ||
d823b11b | 472 | static void |
9de87eea | 473 | on_thread_exit (void *v) |
d823b11b | 474 | { |
0c97d7dd MV |
475 | scm_i_thread *t = (scm_i_thread *)v, **tp; |
476 | ||
9de87eea | 477 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd MV |
478 | |
479 | /* Unblocking the joining threads needs to happen in guile mode | |
480 | since the queue is a SCM data structure. | |
481 | */ | |
9de87eea | 482 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
483 | |
484 | /* Removing ourself from the list of all threads needs to happen in | |
485 | non-guile mode since all SCM values on our stack become | |
486 | unprotected once we are no longer in the list. | |
487 | */ | |
488 | scm_leave_guile (); | |
489 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
490 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
491 | if (*tp == t) | |
492 | { | |
493 | *tp = t->next_thread; | |
494 | break; | |
495 | } | |
496 | thread_count--; | |
497 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
498 | ||
9de87eea | 499 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
500 | } |
501 | ||
9de87eea | 502 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 503 | |
9de87eea MV |
504 | static void |
505 | init_thread_key (void) | |
506 | { | |
507 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
508 | } | |
d823b11b | 509 | |
9de87eea MV |
510 | /* Perform any initializations necessary to bring the current thread |
511 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 512 | |
9de87eea MV |
513 | BASE is the stack base to use with GC. |
514 | ||
515 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
516 | which case the default dynamic state is used. | |
517 | ||
518 | Return zero when the thread was in guile mode already; otherwise | |
519 | return 1. | |
520 | */ | |
521 | ||
522 | static int | |
523 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 524 | { |
9de87eea MV |
525 | scm_i_thread *t; |
526 | ||
527 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
528 | ||
529 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
530 | { | |
531 | /* This thread has not been guilified yet. | |
532 | */ | |
533 | ||
534 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
535 | if (scm_initialized_p == 0) | |
536 | { | |
537 | /* First thread ever to enter Guile. Run the full | |
538 | initialization. | |
539 | */ | |
540 | scm_i_init_guile (base); | |
541 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
542 | } | |
543 | else | |
544 | { | |
545 | /* Guile is already initialized, but this thread enters it for | |
546 | the first time. Only initialize this thread. | |
547 | */ | |
548 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
549 | guilify_self_1 (base); | |
550 | guilify_self_2 (parent); | |
551 | } | |
552 | return 1; | |
553 | } | |
554 | else if (t->top) | |
555 | { | |
556 | /* This thread is already guilified but not in guile mode, just | |
557 | resume it. | |
558 | ||
559 | XXX - base might be lower than when this thread was first | |
560 | guilified. | |
561 | */ | |
562 | scm_enter_guile ((scm_t_guile_ticket) t); | |
563 | return 1; | |
564 | } | |
565 | else | |
566 | { | |
567 | /* Thread is already in guile mode. Nothing to do. | |
568 | */ | |
569 | return 0; | |
570 | } | |
d823b11b MV |
571 | } |
572 | ||
9de87eea | 573 | #if SCM_USE_PTHREAD_THREADS |
8ab3d8a0 KR |
574 | /* pthread_getattr_np not available on MacOS X and Solaris 10. */ |
575 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP | |
9de87eea MV |
576 | |
577 | #define HAVE_GET_THREAD_STACK_BASE | |
578 | ||
579 | static SCM_STACKITEM * | |
580 | get_thread_stack_base () | |
d823b11b | 581 | { |
9de87eea MV |
582 | pthread_attr_t attr; |
583 | void *start, *end; | |
584 | size_t size; | |
585 | ||
9de87eea MV |
586 | pthread_getattr_np (pthread_self (), &attr); |
587 | pthread_attr_getstack (&attr, &start, &size); | |
588 | end = (char *)start + size; | |
589 | ||
2b829bbb KR |
590 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
591 | for the main thread, but we can use scm_get_stack_base in that | |
592 | case. | |
593 | */ | |
594 | ||
595 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 596 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 597 | return scm_get_stack_base (); |
9de87eea | 598 | else |
2b829bbb | 599 | #endif |
9de87eea MV |
600 | { |
601 | #if SCM_STACK_GROWS_UP | |
602 | return start; | |
603 | #else | |
604 | return end; | |
605 | #endif | |
606 | } | |
a54a94b3 MV |
607 | } |
608 | ||
8ab3d8a0 | 609 | #endif /* HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP */ |
9de87eea MV |
610 | |
611 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
612 | ||
613 | #define HAVE_GET_THREAD_STACK_BASE | |
614 | ||
615 | static SCM_STACKITEM * | |
616 | get_thread_stack_base () | |
a54a94b3 | 617 | { |
2b829bbb | 618 | return scm_get_stack_base (); |
d823b11b MV |
619 | } |
620 | ||
9de87eea | 621 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
622 | |
623 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
624 | ||
625 | void | |
626 | scm_init_guile () | |
d823b11b | 627 | { |
9de87eea MV |
628 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
629 | scm_i_default_dynamic_state); | |
d823b11b MV |
630 | } |
631 | ||
9de87eea MV |
632 | #endif |
633 | ||
634 | void * | |
635 | scm_with_guile (void *(*func)(void *), void *data) | |
636 | { | |
637 | return scm_i_with_guile_and_parent (func, data, | |
638 | scm_i_default_dynamic_state); | |
639 | } | |
640 | ||
641 | void * | |
642 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, | |
643 | SCM parent) | |
644 | { | |
645 | void *res; | |
646 | int really_entered; | |
647 | SCM_STACKITEM base_item; | |
648 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); | |
649 | res = scm_c_with_continuation_barrier (func, data); | |
650 | if (really_entered) | |
651 | scm_leave_guile (); | |
652 | return res; | |
653 | } | |
654 | ||
655 | void * | |
656 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 657 | { |
9de87eea MV |
658 | void *res; |
659 | scm_t_guile_ticket t; | |
660 | t = scm_leave_guile (); | |
661 | res = func (data); | |
662 | scm_enter_guile (t); | |
663 | return res; | |
664 | } | |
665 | ||
666 | /*** Thread creation */ | |
667 | ||
668 | typedef struct { | |
669 | SCM parent; | |
670 | SCM thunk; | |
671 | SCM handler; | |
76da80e7 | 672 | SCM thread; |
9de87eea MV |
673 | scm_i_pthread_mutex_t mutex; |
674 | scm_i_pthread_cond_t cond; | |
675 | } launch_data; | |
d823b11b | 676 | |
9de87eea MV |
677 | static void * |
678 | really_launch (void *d) | |
679 | { | |
680 | launch_data *data = (launch_data *)d; | |
681 | SCM thunk = data->thunk, handler = data->handler; | |
682 | scm_i_thread *t; | |
d823b11b | 683 | |
9de87eea | 684 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 685 | |
9de87eea MV |
686 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
687 | data->thread = scm_current_thread (); | |
688 | scm_i_pthread_cond_signal (&data->cond); | |
689 | scm_i_pthread_mutex_unlock (&data->mutex); | |
690 | ||
691 | if (SCM_UNBNDP (handler)) | |
692 | t->result = scm_call_0 (thunk); | |
693 | else | |
694 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
695 | ||
696 | return 0; | |
d823b11b MV |
697 | } |
698 | ||
9de87eea MV |
699 | static void * |
700 | launch_thread (void *d) | |
701 | { | |
702 | launch_data *data = (launch_data *)d; | |
703 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
704 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
705 | return NULL; | |
706 | } | |
707 | ||
708 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 709 | (SCM thunk, SCM handler), |
9de87eea MV |
710 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
711 | "returning a new thread object representing the thread. The procedure\n" | |
712 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
713 | "\n" | |
714 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
715 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
716 | "handler. This catch is established inside the continuation barrier.\n" | |
717 | "\n" | |
718 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
719 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
720 | #define FUNC_NAME s_scm_call_with_new_thread |
721 | { | |
9de87eea MV |
722 | launch_data data; |
723 | scm_i_pthread_t id; | |
724 | int err; | |
d823b11b | 725 | |
9de87eea MV |
726 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
727 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
728 | handler, SCM_ARG2, FUNC_NAME); | |
729 | ||
730 | data.parent = scm_current_dynamic_state (); | |
731 | data.thunk = thunk; | |
732 | data.handler = handler; | |
733 | data.thread = SCM_BOOL_F; | |
734 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
735 | scm_i_pthread_cond_init (&data.cond, NULL); | |
736 | ||
737 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
738 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
739 | if (err) | |
740 | { | |
741 | scm_i_pthread_mutex_unlock (&data.mutex); | |
742 | errno = err; | |
743 | scm_syserror (NULL); | |
744 | } | |
745 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
746 | scm_i_pthread_mutex_unlock (&data.mutex); | |
747 | ||
748 | return data.thread; | |
d823b11b MV |
749 | } |
750 | #undef FUNC_NAME | |
751 | ||
9de87eea MV |
752 | typedef struct { |
753 | SCM parent; | |
754 | scm_t_catch_body body; | |
755 | void *body_data; | |
756 | scm_t_catch_handler handler; | |
757 | void *handler_data; | |
758 | SCM thread; | |
759 | scm_i_pthread_mutex_t mutex; | |
760 | scm_i_pthread_cond_t cond; | |
761 | } spawn_data; | |
762 | ||
763 | static void * | |
764 | really_spawn (void *d) | |
765 | { | |
766 | spawn_data *data = (spawn_data *)d; | |
767 | scm_t_catch_body body = data->body; | |
768 | void *body_data = data->body_data; | |
769 | scm_t_catch_handler handler = data->handler; | |
770 | void *handler_data = data->handler_data; | |
771 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
772 | ||
773 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
774 | data->thread = scm_current_thread (); | |
775 | scm_i_pthread_cond_signal (&data->cond); | |
776 | scm_i_pthread_mutex_unlock (&data->mutex); | |
777 | ||
778 | if (handler == NULL) | |
779 | t->result = body (body_data); | |
780 | else | |
781 | t->result = scm_internal_catch (SCM_BOOL_T, | |
782 | body, body_data, | |
783 | handler, handler_data); | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | static void * | |
789 | spawn_thread (void *d) | |
790 | { | |
791 | spawn_data *data = (spawn_data *)d; | |
792 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
793 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
794 | return NULL; | |
795 | } | |
796 | ||
797 | SCM | |
798 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
799 | scm_t_catch_handler handler, void *handler_data) | |
800 | { | |
801 | spawn_data data; | |
802 | scm_i_pthread_t id; | |
803 | int err; | |
804 | ||
805 | data.parent = scm_current_dynamic_state (); | |
806 | data.body = body; | |
807 | data.body_data = body_data; | |
808 | data.handler = handler; | |
809 | data.handler_data = handler_data; | |
810 | data.thread = SCM_BOOL_F; | |
811 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
812 | scm_i_pthread_cond_init (&data.cond, NULL); | |
813 | ||
814 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
815 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
816 | if (err) | |
817 | { | |
818 | scm_i_pthread_mutex_unlock (&data.mutex); | |
819 | errno = err; | |
820 | scm_syserror (NULL); | |
821 | } | |
822 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
823 | scm_i_pthread_mutex_unlock (&data.mutex); | |
824 | ||
825 | return data.thread; | |
826 | } | |
827 | ||
29717c89 MD |
828 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
829 | (), | |
830 | "Move the calling thread to the end of the scheduling queue.") | |
831 | #define FUNC_NAME s_scm_yield | |
832 | { | |
9de87eea | 833 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
834 | } |
835 | #undef FUNC_NAME | |
836 | ||
d823b11b | 837 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 838 | (SCM thread), |
d823b11b MV |
839 | "Suspend execution of the calling thread until the target @var{thread} " |
840 | "terminates, unless the target @var{thread} has already terminated. ") | |
841 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 842 | { |
9de87eea | 843 | scm_i_thread *t; |
d823b11b MV |
844 | SCM res; |
845 | ||
846 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 847 | if (scm_is_eq (scm_current_thread (), thread)) |
d823b11b MV |
848 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); |
849 | ||
9de87eea MV |
850 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); |
851 | ||
852 | t = SCM_I_THREAD_DATA (thread); | |
d823b11b MV |
853 | if (!t->exited) |
854 | { | |
9de87eea MV |
855 | while (1) |
856 | { | |
857 | block_self (t->join_queue, thread, &thread_admin_mutex, NULL); | |
858 | if (t->exited) | |
859 | break; | |
860 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
861 | SCM_TICK; | |
862 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
863 | } | |
d823b11b MV |
864 | } |
865 | res = t->result; | |
9de87eea MV |
866 | |
867 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 868 | return res; |
5f05c406 MV |
869 | } |
870 | #undef FUNC_NAME | |
871 | ||
9de87eea | 872 | /*** Fat mutexes */ |
4079f87e | 873 | |
d823b11b MV |
874 | /* We implement our own mutex type since we want them to be 'fair', we |
875 | want to do fancy things while waiting for them (like running | |
9de87eea MV |
876 | asyncs) and we might want to add things that are nice for |
877 | debugging. | |
d823b11b | 878 | */ |
4079f87e | 879 | |
9de87eea MV |
880 | typedef struct { |
881 | scm_i_pthread_mutex_t lock; | |
d823b11b | 882 | SCM owner; |
9de87eea MV |
883 | int level; /* how much the owner owns us. |
884 | < 0 for non-recursive mutexes */ | |
885 | SCM waiting; /* the threads waiting for this mutex. */ | |
886 | } fat_mutex; | |
887 | ||
888 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
889 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
5f05c406 | 890 | |
d823b11b | 891 | static SCM |
9de87eea | 892 | fat_mutex_mark (SCM mx) |
d823b11b | 893 | { |
9de87eea | 894 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
895 | scm_gc_mark (m->owner); |
896 | return m->waiting; | |
897 | } | |
4079f87e | 898 | |
9de87eea MV |
899 | static size_t |
900 | fat_mutex_free (SCM mx) | |
76da80e7 | 901 | { |
9de87eea MV |
902 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
903 | scm_i_pthread_mutex_destroy (&m->lock); | |
904 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
905 | return 0; |
906 | } | |
907 | ||
908 | static int | |
9de87eea | 909 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 910 | { |
9de87eea MV |
911 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
912 | scm_puts ("#<mutex ", port); | |
913 | scm_uintprint ((scm_t_bits)m, 16, port); | |
914 | scm_puts (">", port); | |
915 | return 1; | |
76da80e7 MV |
916 | } |
917 | ||
76da80e7 | 918 | static SCM |
9de87eea | 919 | make_fat_mutex (int recursive) |
76da80e7 | 920 | { |
9de87eea MV |
921 | fat_mutex *m; |
922 | SCM mx; | |
923 | ||
924 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
925 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
926 | m->owner = SCM_BOOL_F; | |
927 | m->level = recursive? 0 : -1; | |
928 | m->waiting = SCM_EOL; | |
929 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
930 | m->waiting = make_queue (); | |
931 | return mx; | |
76da80e7 MV |
932 | } |
933 | ||
9de87eea | 934 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, |
76da80e7 | 935 | (void), |
9de87eea MV |
936 | "Create a new mutex. ") |
937 | #define FUNC_NAME s_scm_make_mutex | |
76da80e7 | 938 | { |
9de87eea | 939 | return make_fat_mutex (0); |
76da80e7 MV |
940 | } |
941 | #undef FUNC_NAME | |
942 | ||
9de87eea | 943 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 944 | (void), |
9de87eea MV |
945 | "Create a new recursive mutex. ") |
946 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 947 | { |
9de87eea | 948 | return make_fat_mutex (1); |
9bc4701c MD |
949 | } |
950 | #undef FUNC_NAME | |
951 | ||
9de87eea MV |
952 | static char * |
953 | fat_mutex_lock (SCM mutex) | |
954 | { | |
955 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
956 | SCM thread = scm_current_thread (); | |
957 | char *msg = NULL; | |
958 | ||
959 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
960 | if (scm_is_false (m->owner)) | |
961 | m->owner = thread; | |
962 | else if (scm_is_eq (m->owner, thread)) | |
963 | { | |
964 | if (m->level >= 0) | |
965 | m->level++; | |
966 | else | |
967 | msg = "mutex already locked by current thread"; | |
968 | } | |
969 | else | |
970 | { | |
971 | while (1) | |
972 | { | |
973 | block_self (m->waiting, mutex, &m->lock, NULL); | |
974 | if (scm_is_eq (m->owner, thread)) | |
975 | break; | |
976 | scm_i_pthread_mutex_unlock (&m->lock); | |
977 | SCM_TICK; | |
978 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
979 | } | |
980 | } | |
981 | scm_i_pthread_mutex_unlock (&m->lock); | |
982 | return msg; | |
983 | } | |
984 | ||
9bc4701c MD |
985 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, |
986 | (SCM mx), | |
987 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
988 | "blocks until the mutex becomes available. The function returns when " | |
989 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
990 | "a thread already owns will succeed right away and will not block the " | |
991 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
992 | #define FUNC_NAME s_scm_lock_mutex | |
993 | { | |
9de87eea | 994 | char *msg; |
76da80e7 | 995 | |
b01532af | 996 | SCM_VALIDATE_MUTEX (1, mx); |
9de87eea MV |
997 | msg = fat_mutex_lock (mx); |
998 | if (msg) | |
999 | scm_misc_error (NULL, msg, SCM_EOL); | |
76da80e7 | 1000 | return SCM_BOOL_T; |
9bc4701c | 1001 | } |
76da80e7 | 1002 | #undef FUNC_NAME |
9bc4701c | 1003 | |
a4d106c7 | 1004 | void |
661ae7ab | 1005 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1006 | { |
661ae7ab MV |
1007 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1008 | SCM_F_WIND_EXPLICITLY); | |
1009 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1010 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1011 | } |
1012 | ||
9de87eea MV |
1013 | static char * |
1014 | fat_mutex_trylock (fat_mutex *m, int *resp) | |
1015 | { | |
1016 | char *msg = NULL; | |
1017 | SCM thread = scm_current_thread (); | |
1018 | ||
1019 | *resp = 1; | |
1020 | scm_i_pthread_mutex_lock (&m->lock); | |
1021 | if (scm_is_false (m->owner)) | |
1022 | m->owner = thread; | |
1023 | else if (scm_is_eq (m->owner, thread)) | |
1024 | { | |
1025 | if (m->level >= 0) | |
1026 | m->level++; | |
1027 | else | |
1028 | msg = "mutex already locked by current thread"; | |
1029 | } | |
1030 | else | |
1031 | *resp = 0; | |
1032 | scm_i_pthread_mutex_unlock (&m->lock); | |
1033 | return msg; | |
1034 | } | |
1035 | ||
9bc4701c | 1036 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1037 | (SCM mutex), |
9bc4701c MD |
1038 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1039 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1040 | #define FUNC_NAME s_scm_try_mutex | |
1041 | { | |
9de87eea MV |
1042 | char *msg; |
1043 | int res; | |
1044 | ||
ba1b7223 | 1045 | SCM_VALIDATE_MUTEX (1, mutex); |
9bc4701c | 1046 | |
ba1b7223 | 1047 | msg = fat_mutex_trylock (SCM_MUTEX_DATA (mutex), &res); |
9de87eea MV |
1048 | if (msg) |
1049 | scm_misc_error (NULL, msg, SCM_EOL); | |
1050 | return scm_from_bool (res); | |
1051 | } | |
1052 | #undef FUNC_NAME | |
76da80e7 | 1053 | |
9de87eea MV |
1054 | static char * |
1055 | fat_mutex_unlock (fat_mutex *m) | |
1056 | { | |
1057 | char *msg = NULL; | |
1058 | ||
1059 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1060 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1061 | { |
9de87eea MV |
1062 | if (scm_is_false (m->owner)) |
1063 | msg = "mutex not locked"; | |
1064 | else | |
1065 | msg = "mutex not locked by current thread"; | |
9bc4701c | 1066 | } |
9de87eea MV |
1067 | else if (m->level > 0) |
1068 | m->level--; | |
1069 | else | |
1070 | m->owner = unblock_from_queue (m->waiting); | |
1071 | scm_i_pthread_mutex_unlock (&m->lock); | |
1072 | ||
1073 | return msg; | |
9bc4701c | 1074 | } |
9bc4701c MD |
1075 | |
1076 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
1077 | (SCM mx), | |
1078 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
1079 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1080 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1081 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1082 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1083 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1084 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
1085 | #define FUNC_NAME s_scm_unlock_mutex | |
1086 | { | |
9de87eea | 1087 | char *msg; |
9bc4701c MD |
1088 | SCM_VALIDATE_MUTEX (1, mx); |
1089 | ||
9de87eea MV |
1090 | msg = fat_mutex_unlock (SCM_MUTEX_DATA (mx)); |
1091 | if (msg) | |
1092 | scm_misc_error (NULL, msg, SCM_EOL); | |
9bc4701c MD |
1093 | return SCM_BOOL_T; |
1094 | } | |
1095 | #undef FUNC_NAME | |
1096 | ||
9de87eea MV |
1097 | #if 0 |
1098 | ||
1099 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1100 | (SCM mx), | |
1101 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1102 | #define FUNC_NAME s_scm_mutex_owner | |
1103 | { | |
1104 | SCM_VALIDATE_MUTEX (1, mx); | |
1105 | return (SCM_MUTEX_DATA(mx))->owner; | |
1106 | } | |
1107 | #undef FUNC_NAME | |
1108 | ||
1109 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1110 | (SCM mx), | |
1111 | "Return the lock level of a recursive mutex, or -1\n" | |
1112 | "for a standard mutex.") | |
1113 | #define FUNC_NAME s_scm_mutex_level | |
1114 | { | |
1115 | SCM_VALIDATE_MUTEX (1, mx); | |
1116 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1117 | } | |
1118 | #undef FUNC_NAME | |
1119 | ||
1120 | #endif | |
1121 | ||
1122 | /*** Fat condition variables */ | |
1123 | ||
1124 | typedef struct { | |
1125 | scm_i_pthread_mutex_t lock; | |
1126 | SCM waiting; /* the threads waiting for this condition. */ | |
1127 | } fat_cond; | |
1128 | ||
1129 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1130 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1131 | ||
1132 | static SCM | |
1133 | fat_cond_mark (SCM cv) | |
1134 | { | |
1135 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1136 | return c->waiting; | |
1137 | } | |
1138 | ||
1139 | static size_t | |
1140 | fat_cond_free (SCM mx) | |
1141 | { | |
1142 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1143 | scm_i_pthread_mutex_destroy (&c->lock); | |
1144 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | static int | |
1149 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1150 | { | |
1151 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1152 | scm_puts ("#<condition-variable ", port); | |
1153 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1154 | scm_puts (">", port); | |
1155 | return 1; | |
1156 | } | |
9bc4701c | 1157 | |
d823b11b MV |
1158 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1159 | (void), | |
1160 | "Make a new condition variable.") | |
1161 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1162 | { |
9de87eea MV |
1163 | fat_cond *c; |
1164 | SCM cv; | |
1165 | ||
1166 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1167 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1168 | c->waiting = SCM_EOL; | |
1169 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1170 | c->waiting = make_queue (); | |
d823b11b | 1171 | return cv; |
5f05c406 | 1172 | } |
d823b11b | 1173 | #undef FUNC_NAME |
5f05c406 | 1174 | |
9de87eea MV |
1175 | static int |
1176 | fat_cond_timedwait (SCM cond, SCM mutex, | |
1177 | const scm_t_timespec *waittime) | |
1178 | { | |
1179 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1180 | fat_cond *c = SCM_CONDVAR_DATA (cond); | |
1181 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1182 | const char *msg; | |
1183 | int err = 0; | |
1184 | ||
1185 | while (1) | |
1186 | { | |
9de87eea MV |
1187 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1188 | msg = fat_mutex_unlock (m); | |
1189 | t->block_asyncs++; | |
1190 | if (msg == NULL) | |
1191 | { | |
1192 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1193 | scm_i_pthread_mutex_unlock (&c->lock); | |
9de87eea MV |
1194 | fat_mutex_lock (mutex); |
1195 | } | |
1196 | else | |
1197 | scm_i_pthread_mutex_unlock (&c->lock); | |
1198 | t->block_asyncs--; | |
1199 | scm_async_click (); | |
1200 | ||
9de87eea MV |
1201 | if (msg) |
1202 | scm_misc_error (NULL, msg, SCM_EOL); | |
1203 | ||
1204 | scm_remember_upto_here_2 (cond, mutex); | |
1205 | ||
1206 | if (err == 0) | |
1207 | return 1; | |
1208 | if (err == ETIMEDOUT) | |
1209 | return 0; | |
1210 | if (err != EINTR) | |
1211 | { | |
1212 | errno = err; | |
1213 | scm_syserror (NULL); | |
1214 | } | |
1215 | } | |
1216 | } | |
1217 | ||
d823b11b MV |
1218 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1219 | (SCM cv, SCM mx, SCM t), | |
1220 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1221 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1222 | "is locked again when this function returns. When @var{time} is given, " | |
1223 | "it specifies a point in time where the waiting should be aborted. It " | |
1224 | "can be either a integer as returned by @code{current-time} or a pair " | |
1225 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1226 | "mutex is locked and @code{#f} is returned. When the condition " | |
1227 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1228 | "is returned. ") | |
1229 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1230 | { |
9de87eea | 1231 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1232 | |
1233 | SCM_VALIDATE_CONDVAR (1, cv); | |
1234 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1235 | |
d823b11b MV |
1236 | if (!SCM_UNBNDP (t)) |
1237 | { | |
d2e53ed6 | 1238 | if (scm_is_pair (t)) |
d823b11b | 1239 | { |
9de87eea MV |
1240 | waittime.tv_sec = scm_to_ulong (SCM_CAR (t)); |
1241 | waittime.tv_nsec = scm_to_ulong (SCM_CAR (t)) * 1000; | |
d823b11b MV |
1242 | } |
1243 | else | |
1244 | { | |
9de87eea | 1245 | waittime.tv_sec = scm_to_ulong (t); |
d823b11b MV |
1246 | waittime.tv_nsec = 0; |
1247 | } | |
9de87eea | 1248 | waitptr = &waittime; |
d823b11b MV |
1249 | } |
1250 | ||
9de87eea | 1251 | return scm_from_bool (fat_cond_timedwait (cv, mx, waitptr)); |
5f05c406 | 1252 | } |
d823b11b | 1253 | #undef FUNC_NAME |
5f05c406 | 1254 | |
9de87eea MV |
1255 | static void |
1256 | fat_cond_signal (fat_cond *c) | |
1257 | { | |
9de87eea MV |
1258 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1259 | unblock_from_queue (c->waiting); | |
1260 | scm_i_pthread_mutex_unlock (&c->lock); | |
1261 | } | |
1262 | ||
d823b11b MV |
1263 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1264 | (SCM cv), | |
1265 | "Wake up one thread that is waiting for @var{cv}") | |
1266 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1267 | { |
d823b11b | 1268 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1269 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1270 | return SCM_BOOL_T; |
5f05c406 | 1271 | } |
d823b11b | 1272 | #undef FUNC_NAME |
5f05c406 | 1273 | |
9de87eea MV |
1274 | static void |
1275 | fat_cond_broadcast (fat_cond *c) | |
1276 | { | |
1277 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1278 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1279 | ; | |
1280 | scm_i_pthread_mutex_unlock (&c->lock); | |
1281 | } | |
1282 | ||
d823b11b MV |
1283 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1284 | (SCM cv), | |
1285 | "Wake up all threads that are waiting for @var{cv}. ") | |
1286 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1287 | { |
d823b11b | 1288 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1289 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1290 | return SCM_BOOL_T; |
5f05c406 | 1291 | } |
d823b11b | 1292 | #undef FUNC_NAME |
5f05c406 | 1293 | |
d823b11b MV |
1294 | /*** Marking stacks */ |
1295 | ||
1296 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1297 | threads as well? | |
1298 | */ | |
1299 | #ifdef __ia64__ | |
1300 | # define SCM_MARK_BACKING_STORE() do { \ | |
1301 | ucontext_t ctx; \ | |
1302 | SCM_STACKITEM * top, * bot; \ | |
1303 | getcontext (&ctx); \ | |
1304 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1305 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1306 | / sizeof (SCM_STACKITEM))); \ | |
1307 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
1308 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
1309 | scm_mark_locations (bot, top - bot); } while (0) | |
1310 | #else | |
1311 | # define SCM_MARK_BACKING_STORE() | |
1312 | #endif | |
1313 | ||
1314 | void | |
1315 | scm_threads_mark_stacks (void) | |
5f05c406 | 1316 | { |
9de87eea MV |
1317 | scm_i_thread *t; |
1318 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1319 | { |
9de87eea MV |
1320 | /* Check that thread has indeed been suspended. |
1321 | */ | |
1322 | assert (t->top); | |
6087fad9 | 1323 | |
9de87eea | 1324 | scm_gc_mark (t->handle); |
6087fad9 | 1325 | |
d028af45 | 1326 | #if SCM_STACK_GROWS_UP |
9de87eea | 1327 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1328 | #else |
9de87eea | 1329 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1330 | #endif |
6087fad9 MV |
1331 | scm_mark_locations ((SCM_STACKITEM *) t->regs, |
1332 | ((size_t) sizeof(t->regs) | |
1333 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1334 | } |
59152722 MV |
1335 | |
1336 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1337 | } |
1338 | ||
d823b11b MV |
1339 | /*** Select */ |
1340 | ||
911782b7 | 1341 | int |
9de87eea MV |
1342 | scm_std_select (int nfds, |
1343 | SELECT_TYPE *readfds, | |
1344 | SELECT_TYPE *writefds, | |
1345 | SELECT_TYPE *exceptfds, | |
1346 | struct timeval *timeout) | |
1347 | { | |
1348 | fd_set my_readfds; | |
1349 | int res, eno, wakeup_fd; | |
1350 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1351 | scm_t_guile_ticket ticket; | |
1352 | ||
1353 | if (readfds == NULL) | |
1354 | { | |
1355 | FD_ZERO (&my_readfds); | |
1356 | readfds = &my_readfds; | |
1357 | } | |
1358 | ||
1359 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1360 | SCM_TICK; | |
1361 | ||
1362 | wakeup_fd = t->sleep_pipe[0]; | |
1363 | ticket = scm_leave_guile (); | |
1364 | FD_SET (wakeup_fd, readfds); | |
1365 | if (wakeup_fd >= nfds) | |
1366 | nfds = wakeup_fd+1; | |
1367 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1368 | t->sleep_fd = -1; | |
d823b11b | 1369 | eno = errno; |
9de87eea MV |
1370 | scm_enter_guile (ticket); |
1371 | ||
1372 | scm_i_reset_sleep (t); | |
1373 | ||
1374 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1375 | { | |
1376 | char dummy; | |
1377 | read (wakeup_fd, &dummy, 1); | |
1378 | FD_CLR (wakeup_fd, readfds); | |
1379 | res -= 1; | |
1380 | if (res == 0) | |
1381 | { | |
1382 | eno = EINTR; | |
1383 | res = -1; | |
1384 | } | |
1385 | } | |
d823b11b MV |
1386 | errno = eno; |
1387 | return res; | |
5f05c406 MV |
1388 | } |
1389 | ||
9de87eea | 1390 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1391 | |
9de87eea | 1392 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1393 | |
9bc4701c | 1394 | int |
9de87eea | 1395 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1396 | { |
9de87eea MV |
1397 | scm_t_guile_ticket t = scm_leave_guile (); |
1398 | int res = scm_i_pthread_mutex_lock (mutex); | |
1399 | scm_enter_guile (t); | |
9bc4701c MD |
1400 | return res; |
1401 | } | |
1402 | ||
9de87eea | 1403 | static void |
2b829bbb | 1404 | do_unlock (void *data) |
28d52ebb | 1405 | { |
9de87eea | 1406 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1407 | } |
1408 | ||
1409 | void | |
661ae7ab | 1410 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1411 | { |
9de87eea | 1412 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1413 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1414 | } |
1415 | ||
9bc4701c | 1416 | int |
9de87eea | 1417 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1418 | { |
9de87eea MV |
1419 | scm_t_guile_ticket t = scm_leave_guile (); |
1420 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1421 | scm_enter_guile (t); | |
9bc4701c MD |
1422 | return res; |
1423 | } | |
9bc4701c | 1424 | |
76da80e7 | 1425 | int |
9de87eea MV |
1426 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1427 | scm_i_pthread_mutex_t *mutex, | |
1428 | const scm_t_timespec *wt) | |
76da80e7 | 1429 | { |
9de87eea MV |
1430 | scm_t_guile_ticket t = scm_leave_guile (); |
1431 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1432 | scm_enter_guile (t); | |
1433 | return res; | |
76da80e7 MV |
1434 | } |
1435 | ||
9de87eea | 1436 | #endif |
76da80e7 | 1437 | |
d823b11b | 1438 | unsigned long |
9de87eea | 1439 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1440 | { |
d823b11b MV |
1441 | struct timeval tv; |
1442 | tv.tv_usec = usecs % 1000000; | |
1443 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1444 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1445 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1446 | } |
1447 | ||
9de87eea MV |
1448 | unsigned int |
1449 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1450 | { |
d823b11b MV |
1451 | struct timeval tv; |
1452 | tv.tv_usec = 0; | |
1453 | tv.tv_sec = secs; | |
9de87eea | 1454 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1455 | return tv.tv_sec; |
6c214b62 MD |
1456 | } |
1457 | ||
d823b11b MV |
1458 | /*** Misc */ |
1459 | ||
1460 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1461 | (void), | |
1462 | "Return the thread that called this function.") | |
1463 | #define FUNC_NAME s_scm_current_thread | |
1464 | { | |
9de87eea | 1465 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1466 | } |
1467 | #undef FUNC_NAME | |
1468 | ||
9de87eea MV |
1469 | static SCM |
1470 | scm_c_make_list (size_t n, SCM fill) | |
1471 | { | |
1472 | SCM res = SCM_EOL; | |
1473 | while (n-- > 0) | |
1474 | res = scm_cons (fill, res); | |
1475 | return res; | |
1476 | } | |
1477 | ||
d823b11b MV |
1478 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1479 | (void), | |
1480 | "Return a list of all threads.") | |
9bc4701c | 1481 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1482 | { |
9de87eea MV |
1483 | /* We can not allocate while holding the thread_admin_mutex because |
1484 | of the way GC is done. | |
1485 | */ | |
1486 | int n = thread_count; | |
1487 | scm_i_thread *t; | |
1488 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1489 | |
9de87eea MV |
1490 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1491 | l = &list; | |
1492 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1493 | { | |
1494 | SCM_SETCAR (*l, t->handle); | |
1495 | l = SCM_CDRLOC (*l); | |
1496 | n--; | |
1497 | } | |
1498 | *l = SCM_EOL; | |
1499 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1500 | return list; | |
d823b11b | 1501 | } |
9de87eea | 1502 | #undef FUNC_NAME |
d823b11b MV |
1503 | |
1504 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1505 | (SCM thread), | |
1506 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1507 | #define FUNC_NAME s_scm_thread_exited_p | |
1508 | { | |
7888309b | 1509 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1510 | } |
1511 | #undef FUNC_NAME | |
1512 | ||
911782b7 | 1513 | int |
d823b11b MV |
1514 | scm_c_thread_exited_p (SCM thread) |
1515 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1516 | { |
9de87eea | 1517 | scm_i_thread *t; |
d823b11b | 1518 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1519 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1520 | return t->exited; |
5f05c406 | 1521 | } |
d823b11b | 1522 | #undef FUNC_NAME |
5f05c406 | 1523 | |
9de87eea | 1524 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1525 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1526 | static int threads_initialized_p = 0; |
1527 | ||
1528 | void | |
1529 | scm_i_thread_put_to_sleep () | |
1530 | { | |
6087fad9 | 1531 | if (threads_initialized_p) |
9bc4701c | 1532 | { |
9de87eea | 1533 | scm_i_thread *t; |
6087fad9 | 1534 | |
9de87eea MV |
1535 | scm_leave_guile (); |
1536 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1537 | ||
0c97d7dd MV |
1538 | /* Signal all threads to go to sleep |
1539 | */ | |
1540 | scm_i_thread_go_to_sleep = 1; | |
1541 | for (t = all_threads; t; t = t->next_thread) | |
1542 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1543 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1544 | } |
1545 | } | |
1546 | ||
b0dc3d71 MD |
1547 | void |
1548 | scm_i_thread_invalidate_freelists () | |
1549 | { | |
9de87eea MV |
1550 | /* thread_admin_mutex is already locked. */ |
1551 | ||
1552 | scm_i_thread *t; | |
1553 | for (t = all_threads; t; t = t->next_thread) | |
1554 | if (t != SCM_I_CURRENT_THREAD) | |
1555 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1556 | } |
1557 | ||
9bc4701c MD |
1558 | void |
1559 | scm_i_thread_wake_up () | |
1560 | { | |
6087fad9 | 1561 | if (threads_initialized_p) |
9bc4701c | 1562 | { |
9de87eea | 1563 | scm_i_thread *t; |
9de87eea | 1564 | |
0c97d7dd MV |
1565 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1566 | for (t = all_threads; t; t = t->next_thread) | |
1567 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1568 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1569 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1570 | } |
9bc4701c MD |
1571 | } |
1572 | ||
1573 | void | |
1574 | scm_i_thread_sleep_for_gc () | |
1575 | { | |
9de87eea MV |
1576 | scm_i_thread *t = suspend (); |
1577 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1578 | resume (t); |
9bc4701c MD |
1579 | } |
1580 | ||
a4d106c7 MV |
1581 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1582 | */ | |
d1138028 | 1583 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1584 | int scm_i_critical_section_level = 0; |
1585 | ||
661ae7ab | 1586 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1587 | |
9bc4701c | 1588 | void |
661ae7ab | 1589 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1590 | { |
a4d106c7 | 1591 | if (scm_is_false (mutex)) |
661ae7ab MV |
1592 | mutex = dynwind_critical_section_mutex; |
1593 | scm_dynwind_lock_mutex (mutex); | |
1594 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1595 | } |
1596 | ||
1597 | /*** Initialization */ | |
1598 | ||
1599 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1600 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1601 | ||
d1138028 MV |
1602 | #if SCM_USE_PTHREAD_THREADS |
1603 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1604 | #endif | |
1605 | ||
9de87eea MV |
1606 | void |
1607 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1608 | { | |
d1138028 MV |
1609 | #if SCM_USE_PTHREAD_THREADS |
1610 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1611 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1612 | PTHREAD_MUTEX_RECURSIVE); | |
1613 | #endif | |
1614 | ||
1615 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1616 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1617 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1618 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1619 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1620 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1621 | ||
1622 | guilify_self_1 (base); | |
9bc4701c MD |
1623 | } |
1624 | ||
d823b11b MV |
1625 | scm_t_bits scm_tc16_thread; |
1626 | scm_t_bits scm_tc16_mutex; | |
1627 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1628 | |
7bfd3b9e | 1629 | void |
9de87eea | 1630 | scm_init_threads () |
7bfd3b9e | 1631 | { |
9de87eea | 1632 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
1633 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
1634 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
1635 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
1636 | ||
9de87eea MV |
1637 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
1638 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
1639 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
1640 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1641 | |
9de87eea MV |
1642 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1643 | sizeof (fat_cond)); | |
1644 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
1645 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
1646 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 1647 | |
9de87eea MV |
1648 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1649 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1650 | threads_initialized_p = 1; |
a4d106c7 | 1651 | |
661ae7ab | 1652 | dynwind_critical_section_mutex = |
a4d106c7 | 1653 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 1654 | } |
89e00824 | 1655 | |
5f05c406 | 1656 | void |
9de87eea | 1657 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1658 | { |
9de87eea MV |
1659 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1660 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1661 | } |
1662 | ||
d823b11b | 1663 | void |
9de87eea | 1664 | scm_init_thread_procs () |
d823b11b | 1665 | { |
9de87eea | 1666 | #include "libguile/threads.x" |
d823b11b MV |
1667 | } |
1668 | ||
89e00824 ML |
1669 | /* |
1670 | Local Variables: | |
1671 | c-file-style: "gnu" | |
1672 | End: | |
1673 | */ |