Commit | Line | Data |
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4c908f2c | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005 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> | |
fcc5d734 | 30 | #if HAVE_SYS_TIME_H |
d823b11b | 31 | #include <sys/time.h> |
fcc5d734 | 32 | #endif |
5f05c406 | 33 | |
d823b11b MV |
34 | #include "libguile/validate.h" |
35 | #include "libguile/root.h" | |
36 | #include "libguile/eval.h" | |
37 | #include "libguile/async.h" | |
38 | #include "libguile/ports.h" | |
39 | #include "libguile/threads.h" | |
a0599745 | 40 | #include "libguile/dynwind.h" |
d823b11b | 41 | #include "libguile/iselect.h" |
9de87eea MV |
42 | #include "libguile/fluids.h" |
43 | #include "libguile/continuations.h" | |
44 | #include "libguile/init.h" | |
7bfd3b9e | 45 | |
ecc9f40f MV |
46 | #ifdef __MINGW32__ |
47 | #ifndef ETIMEDOUT | |
48 | # define ETIMEDOUT WSAETIMEDOUT | |
49 | #endif | |
50 | # include <fcntl.h> | |
51 | # include <process.h> | |
52 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
53 | #endif /* __MINGW32__ */ | |
54 | ||
d823b11b | 55 | /*** Queues */ |
7bfd3b9e | 56 | |
9de87eea MV |
57 | /* Make an empty queue data structure. |
58 | */ | |
d823b11b MV |
59 | static SCM |
60 | make_queue () | |
61 | { | |
62 | return scm_cons (SCM_EOL, SCM_EOL); | |
63 | } | |
7bfd3b9e | 64 | |
9de87eea MV |
65 | /* Put T at the back of Q and return a handle that can be used with |
66 | remqueue to remove T from Q again. | |
67 | */ | |
d823b11b MV |
68 | static SCM |
69 | enqueue (SCM q, SCM t) | |
70 | { | |
71 | SCM c = scm_cons (t, SCM_EOL); | |
d2e53ed6 | 72 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
73 | SCM_SETCDR (q, c); |
74 | else | |
75 | SCM_SETCDR (SCM_CAR (q), c); | |
76 | SCM_SETCAR (q, c); | |
77 | return c; | |
78 | } | |
7bfd3b9e | 79 | |
9de87eea MV |
80 | /* Remove the element that the handle C refers to from the queue Q. C |
81 | must have been returned from a call to enqueue. The return value | |
82 | is zero when the element referred to by C has already been removed. | |
83 | Otherwise, 1 is returned. | |
84 | */ | |
85 | static int | |
d823b11b MV |
86 | remqueue (SCM q, SCM c) |
87 | { | |
88 | SCM p, prev = q; | |
d2e53ed6 | 89 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 90 | { |
bc36d050 | 91 | if (scm_is_eq (p, c)) |
d823b11b | 92 | { |
bc36d050 | 93 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
94 | SCM_SETCAR (q, SCM_CDR (c)); |
95 | SCM_SETCDR (prev, SCM_CDR (c)); | |
9de87eea | 96 | return 1; |
d823b11b MV |
97 | } |
98 | prev = p; | |
99 | } | |
9de87eea | 100 | return 0; |
d823b11b MV |
101 | } |
102 | ||
9de87eea MV |
103 | /* Remove the front-most element from the queue Q and return it. |
104 | Return SCM_BOOL_F when Q is empty. | |
105 | */ | |
d823b11b MV |
106 | static SCM |
107 | dequeue (SCM q) | |
108 | { | |
109 | SCM c = SCM_CDR (q); | |
d2e53ed6 | 110 | if (scm_is_null (c)) |
d823b11b MV |
111 | return SCM_BOOL_F; |
112 | else | |
113 | { | |
114 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 115 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
116 | SCM_SETCAR (q, SCM_EOL); |
117 | return SCM_CAR (c); | |
118 | } | |
119 | } | |
7bfd3b9e | 120 | |
9de87eea | 121 | /*** Thread smob routines */ |
76da80e7 | 122 | |
d823b11b MV |
123 | static SCM |
124 | thread_mark (SCM obj) | |
125 | { | |
9de87eea | 126 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
d823b11b | 127 | scm_gc_mark (t->result); |
9de87eea MV |
128 | scm_gc_mark (t->join_queue); |
129 | scm_gc_mark (t->dynwinds); | |
130 | scm_gc_mark (t->active_asyncs); | |
9de87eea MV |
131 | scm_gc_mark (t->continuation_root); |
132 | return t->dynamic_state; | |
d823b11b MV |
133 | } |
134 | ||
135 | static int | |
136 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
137 | { | |
9de87eea | 138 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
d823b11b | 139 | scm_puts ("#<thread ", port); |
9de87eea | 140 | scm_uintprint ((size_t)t->pthread, 10, port); |
1b92fb6b | 141 | scm_puts (" (", port); |
0345e278 | 142 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 143 | scm_puts (")>", port); |
d823b11b MV |
144 | return 1; |
145 | } | |
146 | ||
147 | static size_t | |
148 | thread_free (SCM obj) | |
149 | { | |
9de87eea MV |
150 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
151 | assert (t->exited); | |
d823b11b MV |
152 | scm_gc_free (t, sizeof (*t), "thread"); |
153 | return 0; | |
154 | } | |
155 | ||
9de87eea | 156 | /*** Blocking on queues. */ |
f7eca35d | 157 | |
9de87eea MV |
158 | /* See also scm_i_queue_async_cell for how such a block is |
159 | interrputed. | |
160 | */ | |
d823b11b | 161 | |
9de87eea MV |
162 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
163 | be woken up by a call to 'unblock_from_queue', or to be | |
164 | interrupted. Upon return of this function, the current thread is | |
165 | no longer on QUEUE, even when the sleep has been interrupted. | |
166 | ||
167 | The QUEUE data structure is assumed to be protected by MUTEX and | |
168 | the caller of block_self must hold MUTEX. It will be atomically | |
169 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
170 | ||
171 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
172 | as MUTEX is needed. | |
173 | ||
174 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
175 | ||
176 | The return value of block_self is an errno value. It will be zero | |
177 | when the sleep has been successfully completed by a call to | |
178 | unblock_from_queue, EINTR when it has been interrupted by the | |
179 | delivery of a system async, and ETIMEDOUT when the timeout has | |
180 | expired. | |
181 | ||
182 | The system asyncs themselves are not executed by block_self. | |
183 | */ | |
184 | static int | |
185 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
186 | const scm_t_timespec *waittime) | |
76da80e7 | 187 | { |
9de87eea MV |
188 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
189 | SCM q_handle; | |
190 | int err; | |
191 | ||
192 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
193 | err = EINTR; | |
194 | else | |
195 | { | |
196 | t->block_asyncs++; | |
197 | q_handle = enqueue (queue, t->handle); | |
198 | if (waittime == NULL) | |
199 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
200 | else | |
201 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
202 | ||
203 | /* When we are still on QUEUE, we have been interrupted. We | |
204 | report this only when no other error (such as a timeout) has | |
205 | happened above. | |
206 | */ | |
207 | if (remqueue (queue, q_handle) && err == 0) | |
208 | err = EINTR; | |
209 | t->block_asyncs--; | |
210 | scm_i_reset_sleep (t); | |
211 | } | |
212 | ||
213 | return err; | |
76da80e7 | 214 | } |
9de87eea MV |
215 | |
216 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
217 | the mutex that protects QUEUE. The awoken thread is returned, or | |
218 | #f when the queue was empty. | |
219 | */ | |
220 | static SCM | |
221 | unblock_from_queue (SCM queue) | |
222 | { | |
223 | SCM thread = dequeue (queue); | |
224 | if (scm_is_true (thread)) | |
225 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
226 | return thread; | |
227 | } | |
228 | ||
229 | /* Getting into and out of guile mode. | |
230 | */ | |
231 | ||
98648121 MV |
232 | /* Ken Raeburn observes that the implementation of suspend and resume |
233 | (and the things that build on top of them) are very likely not | |
234 | correct (see below). We will need fix this eventually, and that's | |
235 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
236 | ||
237 | Ken writes: | |
238 | ||
239 | Consider this sequence: | |
240 | ||
241 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
242 | through scm_leave_guile), which does this: | |
243 | ||
244 | // record top of stack for the GC | |
245 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
246 | var 't' | |
247 | // save registers. | |
248 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
249 | setjmp (t->regs); // here's most of the magic | |
250 | ||
251 | ... and returns. | |
252 | ||
253 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
254 | a caller-saved register R, and it's the only reference to the object | |
255 | currently. | |
256 | ||
257 | The compiler wants to use R in suspend, so it pushes the current | |
258 | value, X, into a stack slot which will be reloaded on exit from | |
259 | suspend; then it loads stuff into R and goes about its business. The | |
260 | setjmp call saves (some of) the current registers, including R, which | |
261 | no longer contains X. (This isn't a problem for a normal | |
262 | setjmp/longjmp situation, where longjmp would be called before | |
263 | setjmp's caller returns; the old value for X would be loaded back from | |
264 | the stack after the longjmp, before the function returned.) | |
265 | ||
266 | So, suspend returns, loading X back into R (and invalidating the jump | |
267 | buffer) in the process. The caller foo then goes off and calls a | |
268 | bunch of other functions out of Guile mode, occasionally storing X on | |
269 | the stack again, but, say, much deeper on the stack than suspend's | |
270 | stack frame went, and the stack slot where suspend had written X has | |
271 | long since been overwritten with other values. | |
272 | ||
273 | Okay, nothing actively broken so far. Now, let garbage collection | |
274 | run, triggered by another thread. | |
275 | ||
276 | The thread calling foo is out of Guile mode at the time, so the | |
277 | garbage collector just scans a range of stack addresses. Too bad that | |
278 | X isn't stored there. So the pointed-to storage goes onto the free | |
279 | list, and I think you can see where things go from there. | |
280 | ||
281 | Is there anything I'm missing that'll prevent this scenario from | |
282 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
283 | don't have many local variables, so they probably won't need to save | |
284 | any registers on most systems, so we hope everything will wind up in | |
285 | the jump buffer and we'll just get away with it"? | |
286 | ||
287 | (And, going the other direction, if scm_leave_guile and suspend push | |
288 | the stack pointer over onto a new page, and foo doesn't make further | |
289 | function calls and thus the stack pointer no longer includes that | |
290 | page, are we guaranteed that the kernel cannot release the now-unused | |
291 | stack page that contains the top-of-stack pointer we just saved? I | |
292 | don't know if any OS actually does that. If it does, we could get | |
293 | faults in garbage collection.) | |
294 | ||
295 | I don't think scm_without_guile has to have this problem, as it gets | |
296 | more control over the stack handling -- but it should call setjmp | |
297 | itself. I'd probably try something like: | |
298 | ||
299 | // record top of stack for the GC | |
300 | t->top = SCM_STACK_PTR (&t); | |
301 | // save registers. | |
302 | SCM_FLUSH_REGISTER_WINDOWS; | |
303 | setjmp (t->regs); | |
304 | res = func(data); | |
305 | scm_enter_guile (t); | |
306 | ||
307 | ... though even that's making some assumptions about the stack | |
308 | ordering of local variables versus caller-saved registers. | |
309 | ||
310 | For something like scm_leave_guile to work, I don't think it can just | |
311 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
312 | on the stack state at the point when the jump buffer was initialized, | |
313 | together, would work fine, but I think then we're talking about macros | |
314 | invoking setjmp in the caller's stack frame, and requiring that the | |
315 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
316 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
317 | in a function. (In fact, the pthread ones have to be paired up | |
318 | syntactically, as if they might expand to a compound statement | |
319 | incorporating the user's code, and invoking a compiler's | |
320 | exception-handling primitives. Which might be something to think | |
321 | about for cases where Guile is used with C++ exceptions or | |
322 | pthread_cancel.) | |
323 | */ | |
324 | ||
9de87eea MV |
325 | scm_i_pthread_key_t scm_i_thread_key; |
326 | ||
d823b11b | 327 | static void |
9de87eea | 328 | resume (scm_i_thread *t) |
d823b11b | 329 | { |
d823b11b | 330 | t->top = NULL; |
9bc4701c MD |
331 | if (t->clear_freelists_p) |
332 | { | |
333 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
334 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
335 | t->clear_freelists_p = 0; | |
336 | } | |
d823b11b MV |
337 | } |
338 | ||
98648121 MV |
339 | typedef void* scm_t_guile_ticket; |
340 | ||
341 | static void | |
9de87eea | 342 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 343 | { |
9de87eea MV |
344 | scm_i_thread *t = (scm_i_thread *)ticket; |
345 | if (t) | |
346 | { | |
347 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
348 | resume (t); | |
349 | } | |
d823b11b MV |
350 | } |
351 | ||
9de87eea MV |
352 | static scm_i_thread * |
353 | suspend (void) | |
d823b11b | 354 | { |
9de87eea | 355 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
356 | |
357 | /* record top of stack for the GC */ | |
9de87eea | 358 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
359 | /* save registers. */ |
360 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
361 | setjmp (t->regs); |
362 | return t; | |
d823b11b MV |
363 | } |
364 | ||
98648121 | 365 | static scm_t_guile_ticket |
9de87eea | 366 | scm_leave_guile () |
d823b11b | 367 | { |
9de87eea MV |
368 | scm_i_thread *t = suspend (); |
369 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
370 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
371 | } |
372 | ||
9de87eea MV |
373 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
374 | static scm_i_thread *all_threads = NULL; | |
375 | static int thread_count; | |
376 | ||
377 | static SCM scm_i_default_dynamic_state; | |
378 | ||
379 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 380 | */ |
9de87eea MV |
381 | static void |
382 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 383 | { |
9de87eea MV |
384 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
385 | ||
386 | t->pthread = scm_i_pthread_self (); | |
387 | t->handle = SCM_BOOL_F; | |
388 | t->result = SCM_BOOL_F; | |
389 | t->join_queue = SCM_EOL; | |
390 | t->dynamic_state = SCM_BOOL_F; | |
391 | t->dynwinds = SCM_EOL; | |
392 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
393 | t->block_asyncs = 1; |
394 | t->pending_asyncs = 1; | |
395 | t->last_debug_frame = NULL; | |
396 | t->base = base; | |
0c97d7dd | 397 | t->continuation_root = SCM_EOL; |
9de87eea MV |
398 | t->continuation_base = base; |
399 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
400 | t->sleep_mutex = NULL; | |
401 | t->sleep_object = SCM_BOOL_F; | |
402 | t->sleep_fd = -1; | |
0c97d7dd | 403 | /* XXX - check for errors. */ |
9de87eea MV |
404 | pipe (t->sleep_pipe); |
405 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
406 | t->clear_freelists_p = 0; | |
1a8fdd7e | 407 | t->gc_running_p = 0; |
9de87eea MV |
408 | t->exited = 0; |
409 | ||
410 | t->freelist = SCM_EOL; | |
411 | t->freelist2 = SCM_EOL; | |
412 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
413 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
414 | ||
415 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
416 | ||
417 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
418 | ||
419 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
420 | t->next_thread = all_threads; | |
421 | all_threads = t; | |
422 | thread_count++; | |
423 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
424 | } |
425 | ||
9de87eea | 426 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 427 | */ |
9de87eea MV |
428 | static void |
429 | guilify_self_2 (SCM parent) | |
d823b11b | 430 | { |
9de87eea MV |
431 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
432 | ||
433 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
434 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
435 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
436 | t->continuation_base = t->base; | |
437 | ||
438 | if (scm_is_true (parent)) | |
439 | t->dynamic_state = scm_make_dynamic_state (parent); | |
440 | else | |
441 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
442 | ||
443 | t->join_queue = make_queue (); | |
444 | t->block_asyncs = 0; | |
d823b11b MV |
445 | } |
446 | ||
9de87eea | 447 | /* Perform thread tear-down, in guile mode. |
d823b11b | 448 | */ |
9de87eea MV |
449 | static void * |
450 | do_thread_exit (void *v) | |
451 | { | |
0c97d7dd | 452 | scm_i_thread *t = (scm_i_thread *)v; |
9de87eea MV |
453 | |
454 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
455 | ||
456 | t->exited = 1; | |
0c97d7dd MV |
457 | close (t->sleep_pipe[0]); |
458 | close (t->sleep_pipe[1]); | |
9de87eea MV |
459 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
460 | ; | |
9de87eea MV |
461 | |
462 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
463 | return NULL; | |
464 | } | |
465 | ||
d823b11b | 466 | static void |
9de87eea | 467 | on_thread_exit (void *v) |
d823b11b | 468 | { |
0c97d7dd MV |
469 | scm_i_thread *t = (scm_i_thread *)v, **tp; |
470 | ||
9de87eea | 471 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd MV |
472 | |
473 | /* Unblocking the joining threads needs to happen in guile mode | |
474 | since the queue is a SCM data structure. | |
475 | */ | |
9de87eea | 476 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
477 | |
478 | /* Removing ourself from the list of all threads needs to happen in | |
479 | non-guile mode since all SCM values on our stack become | |
480 | unprotected once we are no longer in the list. | |
481 | */ | |
482 | scm_leave_guile (); | |
483 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
484 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
485 | if (*tp == t) | |
486 | { | |
487 | *tp = t->next_thread; | |
488 | break; | |
489 | } | |
490 | thread_count--; | |
491 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
492 | ||
9de87eea | 493 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
494 | } |
495 | ||
9de87eea | 496 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 497 | |
9de87eea MV |
498 | static void |
499 | init_thread_key (void) | |
500 | { | |
501 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
502 | } | |
d823b11b | 503 | |
9de87eea MV |
504 | /* Perform any initializations necessary to bring the current thread |
505 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 506 | |
9de87eea MV |
507 | BASE is the stack base to use with GC. |
508 | ||
509 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
510 | which case the default dynamic state is used. | |
511 | ||
512 | Return zero when the thread was in guile mode already; otherwise | |
513 | return 1. | |
514 | */ | |
515 | ||
516 | static int | |
517 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 518 | { |
9de87eea MV |
519 | scm_i_thread *t; |
520 | ||
521 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
522 | ||
523 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
524 | { | |
525 | /* This thread has not been guilified yet. | |
526 | */ | |
527 | ||
528 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
529 | if (scm_initialized_p == 0) | |
530 | { | |
531 | /* First thread ever to enter Guile. Run the full | |
532 | initialization. | |
533 | */ | |
534 | scm_i_init_guile (base); | |
535 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
536 | } | |
537 | else | |
538 | { | |
539 | /* Guile is already initialized, but this thread enters it for | |
540 | the first time. Only initialize this thread. | |
541 | */ | |
542 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
543 | guilify_self_1 (base); | |
544 | guilify_self_2 (parent); | |
545 | } | |
546 | return 1; | |
547 | } | |
548 | else if (t->top) | |
549 | { | |
550 | /* This thread is already guilified but not in guile mode, just | |
551 | resume it. | |
552 | ||
553 | XXX - base might be lower than when this thread was first | |
554 | guilified. | |
555 | */ | |
556 | scm_enter_guile ((scm_t_guile_ticket) t); | |
557 | return 1; | |
558 | } | |
559 | else | |
560 | { | |
561 | /* Thread is already in guile mode. Nothing to do. | |
562 | */ | |
563 | return 0; | |
564 | } | |
d823b11b MV |
565 | } |
566 | ||
9de87eea MV |
567 | #ifdef HAVE_LIBC_STACK_END |
568 | ||
569 | extern void *__libc_stack_end; | |
570 | ||
571 | #if SCM_USE_PTHREAD_THREADS | |
572 | #ifdef HAVE_PTHREAD_ATTR_GETSTACK | |
573 | ||
574 | #define HAVE_GET_THREAD_STACK_BASE | |
575 | ||
576 | static SCM_STACKITEM * | |
577 | get_thread_stack_base () | |
d823b11b | 578 | { |
9de87eea MV |
579 | pthread_attr_t attr; |
580 | void *start, *end; | |
581 | size_t size; | |
582 | ||
583 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work | |
584 | for the main thread, but we can use __libc_stack_end in that | |
585 | case. | |
586 | */ | |
587 | ||
588 | pthread_getattr_np (pthread_self (), &attr); | |
589 | pthread_attr_getstack (&attr, &start, &size); | |
590 | end = (char *)start + size; | |
591 | ||
592 | if ((void *)&attr < start || (void *)&attr >= end) | |
593 | return __libc_stack_end; | |
594 | else | |
595 | { | |
596 | #if SCM_STACK_GROWS_UP | |
597 | return start; | |
598 | #else | |
599 | return end; | |
600 | #endif | |
601 | } | |
a54a94b3 MV |
602 | } |
603 | ||
9de87eea MV |
604 | #endif /* HAVE_PTHREAD_ATTR_GETSTACK */ |
605 | ||
606 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
607 | ||
608 | #define HAVE_GET_THREAD_STACK_BASE | |
609 | ||
610 | static SCM_STACKITEM * | |
611 | get_thread_stack_base () | |
a54a94b3 | 612 | { |
9de87eea | 613 | return __libc_stack_end; |
d823b11b MV |
614 | } |
615 | ||
9de87eea MV |
616 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
617 | #endif /* HAVE_LIBC_STACK_END */ | |
618 | ||
619 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
620 | ||
621 | void | |
622 | scm_init_guile () | |
d823b11b | 623 | { |
9de87eea MV |
624 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
625 | scm_i_default_dynamic_state); | |
d823b11b MV |
626 | } |
627 | ||
9de87eea MV |
628 | #endif |
629 | ||
630 | void * | |
631 | scm_with_guile (void *(*func)(void *), void *data) | |
632 | { | |
633 | return scm_i_with_guile_and_parent (func, data, | |
634 | scm_i_default_dynamic_state); | |
635 | } | |
636 | ||
637 | void * | |
638 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, | |
639 | SCM parent) | |
640 | { | |
641 | void *res; | |
642 | int really_entered; | |
643 | SCM_STACKITEM base_item; | |
644 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); | |
645 | res = scm_c_with_continuation_barrier (func, data); | |
646 | if (really_entered) | |
647 | scm_leave_guile (); | |
648 | return res; | |
649 | } | |
650 | ||
651 | void * | |
652 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 653 | { |
9de87eea MV |
654 | void *res; |
655 | scm_t_guile_ticket t; | |
656 | t = scm_leave_guile (); | |
657 | res = func (data); | |
658 | scm_enter_guile (t); | |
659 | return res; | |
660 | } | |
661 | ||
662 | /*** Thread creation */ | |
663 | ||
664 | typedef struct { | |
665 | SCM parent; | |
666 | SCM thunk; | |
667 | SCM handler; | |
76da80e7 | 668 | SCM thread; |
9de87eea MV |
669 | scm_i_pthread_mutex_t mutex; |
670 | scm_i_pthread_cond_t cond; | |
671 | } launch_data; | |
d823b11b | 672 | |
9de87eea MV |
673 | static void * |
674 | really_launch (void *d) | |
675 | { | |
676 | launch_data *data = (launch_data *)d; | |
677 | SCM thunk = data->thunk, handler = data->handler; | |
678 | scm_i_thread *t; | |
d823b11b | 679 | |
9de87eea | 680 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 681 | |
9de87eea MV |
682 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
683 | data->thread = scm_current_thread (); | |
684 | scm_i_pthread_cond_signal (&data->cond); | |
685 | scm_i_pthread_mutex_unlock (&data->mutex); | |
686 | ||
687 | if (SCM_UNBNDP (handler)) | |
688 | t->result = scm_call_0 (thunk); | |
689 | else | |
690 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
691 | ||
692 | return 0; | |
d823b11b MV |
693 | } |
694 | ||
9de87eea MV |
695 | static void * |
696 | launch_thread (void *d) | |
697 | { | |
698 | launch_data *data = (launch_data *)d; | |
699 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
700 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
701 | return NULL; | |
702 | } | |
703 | ||
704 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 705 | (SCM thunk, SCM handler), |
9de87eea MV |
706 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
707 | "returning a new thread object representing the thread. The procedure\n" | |
708 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
709 | "\n" | |
710 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
711 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
712 | "handler. This catch is established inside the continuation barrier.\n" | |
713 | "\n" | |
714 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
715 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
716 | #define FUNC_NAME s_scm_call_with_new_thread |
717 | { | |
9de87eea MV |
718 | launch_data data; |
719 | scm_i_pthread_t id; | |
720 | int err; | |
d823b11b | 721 | |
9de87eea MV |
722 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
723 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
724 | handler, SCM_ARG2, FUNC_NAME); | |
725 | ||
726 | data.parent = scm_current_dynamic_state (); | |
727 | data.thunk = thunk; | |
728 | data.handler = handler; | |
729 | data.thread = SCM_BOOL_F; | |
730 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
731 | scm_i_pthread_cond_init (&data.cond, NULL); | |
732 | ||
733 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
734 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
735 | if (err) | |
736 | { | |
737 | scm_i_pthread_mutex_unlock (&data.mutex); | |
738 | errno = err; | |
739 | scm_syserror (NULL); | |
740 | } | |
741 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
742 | scm_i_pthread_mutex_unlock (&data.mutex); | |
743 | ||
744 | return data.thread; | |
d823b11b MV |
745 | } |
746 | #undef FUNC_NAME | |
747 | ||
9de87eea MV |
748 | typedef struct { |
749 | SCM parent; | |
750 | scm_t_catch_body body; | |
751 | void *body_data; | |
752 | scm_t_catch_handler handler; | |
753 | void *handler_data; | |
754 | SCM thread; | |
755 | scm_i_pthread_mutex_t mutex; | |
756 | scm_i_pthread_cond_t cond; | |
757 | } spawn_data; | |
758 | ||
759 | static void * | |
760 | really_spawn (void *d) | |
761 | { | |
762 | spawn_data *data = (spawn_data *)d; | |
763 | scm_t_catch_body body = data->body; | |
764 | void *body_data = data->body_data; | |
765 | scm_t_catch_handler handler = data->handler; | |
766 | void *handler_data = data->handler_data; | |
767 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
768 | ||
769 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
770 | data->thread = scm_current_thread (); | |
771 | scm_i_pthread_cond_signal (&data->cond); | |
772 | scm_i_pthread_mutex_unlock (&data->mutex); | |
773 | ||
774 | if (handler == NULL) | |
775 | t->result = body (body_data); | |
776 | else | |
777 | t->result = scm_internal_catch (SCM_BOOL_T, | |
778 | body, body_data, | |
779 | handler, handler_data); | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | static void * | |
785 | spawn_thread (void *d) | |
786 | { | |
787 | spawn_data *data = (spawn_data *)d; | |
788 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
789 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
790 | return NULL; | |
791 | } | |
792 | ||
793 | SCM | |
794 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
795 | scm_t_catch_handler handler, void *handler_data) | |
796 | { | |
797 | spawn_data data; | |
798 | scm_i_pthread_t id; | |
799 | int err; | |
800 | ||
801 | data.parent = scm_current_dynamic_state (); | |
802 | data.body = body; | |
803 | data.body_data = body_data; | |
804 | data.handler = handler; | |
805 | data.handler_data = handler_data; | |
806 | data.thread = SCM_BOOL_F; | |
807 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
808 | scm_i_pthread_cond_init (&data.cond, NULL); | |
809 | ||
810 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
811 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
812 | if (err) | |
813 | { | |
814 | scm_i_pthread_mutex_unlock (&data.mutex); | |
815 | errno = err; | |
816 | scm_syserror (NULL); | |
817 | } | |
818 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
819 | scm_i_pthread_mutex_unlock (&data.mutex); | |
820 | ||
821 | return data.thread; | |
822 | } | |
823 | ||
29717c89 MD |
824 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
825 | (), | |
826 | "Move the calling thread to the end of the scheduling queue.") | |
827 | #define FUNC_NAME s_scm_yield | |
828 | { | |
9de87eea | 829 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
830 | } |
831 | #undef FUNC_NAME | |
832 | ||
d823b11b | 833 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 834 | (SCM thread), |
d823b11b MV |
835 | "Suspend execution of the calling thread until the target @var{thread} " |
836 | "terminates, unless the target @var{thread} has already terminated. ") | |
837 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 838 | { |
9de87eea | 839 | scm_i_thread *t; |
d823b11b MV |
840 | SCM res; |
841 | ||
842 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 843 | if (scm_is_eq (scm_current_thread (), thread)) |
d823b11b MV |
844 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); |
845 | ||
9de87eea MV |
846 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); |
847 | ||
848 | t = SCM_I_THREAD_DATA (thread); | |
d823b11b MV |
849 | if (!t->exited) |
850 | { | |
9de87eea MV |
851 | while (1) |
852 | { | |
853 | block_self (t->join_queue, thread, &thread_admin_mutex, NULL); | |
854 | if (t->exited) | |
855 | break; | |
856 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
857 | SCM_TICK; | |
858 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
859 | } | |
d823b11b MV |
860 | } |
861 | res = t->result; | |
9de87eea MV |
862 | |
863 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 864 | return res; |
5f05c406 MV |
865 | } |
866 | #undef FUNC_NAME | |
867 | ||
9de87eea | 868 | /*** Fat mutexes */ |
4079f87e | 869 | |
d823b11b MV |
870 | /* We implement our own mutex type since we want them to be 'fair', we |
871 | want to do fancy things while waiting for them (like running | |
9de87eea MV |
872 | asyncs) and we might want to add things that are nice for |
873 | debugging. | |
d823b11b | 874 | */ |
4079f87e | 875 | |
9de87eea MV |
876 | typedef struct { |
877 | scm_i_pthread_mutex_t lock; | |
d823b11b | 878 | SCM owner; |
9de87eea MV |
879 | int level; /* how much the owner owns us. |
880 | < 0 for non-recursive mutexes */ | |
881 | SCM waiting; /* the threads waiting for this mutex. */ | |
882 | } fat_mutex; | |
883 | ||
884 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
885 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
5f05c406 | 886 | |
d823b11b | 887 | static SCM |
9de87eea | 888 | fat_mutex_mark (SCM mx) |
d823b11b | 889 | { |
9de87eea | 890 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
891 | scm_gc_mark (m->owner); |
892 | return m->waiting; | |
893 | } | |
4079f87e | 894 | |
9de87eea MV |
895 | static size_t |
896 | fat_mutex_free (SCM mx) | |
76da80e7 | 897 | { |
9de87eea MV |
898 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
899 | scm_i_pthread_mutex_destroy (&m->lock); | |
900 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
901 | return 0; |
902 | } | |
903 | ||
904 | static int | |
9de87eea | 905 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 906 | { |
9de87eea MV |
907 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
908 | scm_puts ("#<mutex ", port); | |
909 | scm_uintprint ((scm_t_bits)m, 16, port); | |
910 | scm_puts (">", port); | |
911 | return 1; | |
76da80e7 MV |
912 | } |
913 | ||
76da80e7 | 914 | static SCM |
9de87eea | 915 | make_fat_mutex (int recursive) |
76da80e7 | 916 | { |
9de87eea MV |
917 | fat_mutex *m; |
918 | SCM mx; | |
919 | ||
920 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
921 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
922 | m->owner = SCM_BOOL_F; | |
923 | m->level = recursive? 0 : -1; | |
924 | m->waiting = SCM_EOL; | |
925 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
926 | m->waiting = make_queue (); | |
927 | return mx; | |
76da80e7 MV |
928 | } |
929 | ||
9de87eea | 930 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, |
76da80e7 | 931 | (void), |
9de87eea MV |
932 | "Create a new mutex. ") |
933 | #define FUNC_NAME s_scm_make_mutex | |
76da80e7 | 934 | { |
9de87eea | 935 | return make_fat_mutex (0); |
76da80e7 MV |
936 | } |
937 | #undef FUNC_NAME | |
938 | ||
9de87eea | 939 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 940 | (void), |
9de87eea MV |
941 | "Create a new recursive mutex. ") |
942 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 943 | { |
9de87eea | 944 | return make_fat_mutex (1); |
9bc4701c MD |
945 | } |
946 | #undef FUNC_NAME | |
947 | ||
9de87eea MV |
948 | static char * |
949 | fat_mutex_lock (SCM mutex) | |
950 | { | |
951 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
952 | SCM thread = scm_current_thread (); | |
953 | char *msg = NULL; | |
954 | ||
955 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
956 | if (scm_is_false (m->owner)) | |
957 | m->owner = thread; | |
958 | else if (scm_is_eq (m->owner, thread)) | |
959 | { | |
960 | if (m->level >= 0) | |
961 | m->level++; | |
962 | else | |
963 | msg = "mutex already locked by current thread"; | |
964 | } | |
965 | else | |
966 | { | |
967 | while (1) | |
968 | { | |
969 | block_self (m->waiting, mutex, &m->lock, NULL); | |
970 | if (scm_is_eq (m->owner, thread)) | |
971 | break; | |
972 | scm_i_pthread_mutex_unlock (&m->lock); | |
973 | SCM_TICK; | |
974 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
975 | } | |
976 | } | |
977 | scm_i_pthread_mutex_unlock (&m->lock); | |
978 | return msg; | |
979 | } | |
980 | ||
9bc4701c MD |
981 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, |
982 | (SCM mx), | |
983 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
984 | "blocks until the mutex becomes available. The function returns when " | |
985 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
986 | "a thread already owns will succeed right away and will not block the " | |
987 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
988 | #define FUNC_NAME s_scm_lock_mutex | |
989 | { | |
9de87eea | 990 | char *msg; |
76da80e7 | 991 | |
b01532af | 992 | SCM_VALIDATE_MUTEX (1, mx); |
9de87eea MV |
993 | msg = fat_mutex_lock (mx); |
994 | if (msg) | |
995 | scm_misc_error (NULL, msg, SCM_EOL); | |
76da80e7 | 996 | return SCM_BOOL_T; |
9bc4701c | 997 | } |
76da80e7 | 998 | #undef FUNC_NAME |
9bc4701c | 999 | |
a4d106c7 MV |
1000 | void |
1001 | scm_frame_lock_mutex (SCM mutex) | |
1002 | { | |
1003 | scm_frame_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, | |
1004 | SCM_F_WIND_EXPLICITLY); | |
1005 | scm_frame_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1006 | SCM_F_WIND_EXPLICITLY); | |
1007 | } | |
1008 | ||
9de87eea MV |
1009 | static char * |
1010 | fat_mutex_trylock (fat_mutex *m, int *resp) | |
1011 | { | |
1012 | char *msg = NULL; | |
1013 | SCM thread = scm_current_thread (); | |
1014 | ||
1015 | *resp = 1; | |
1016 | scm_i_pthread_mutex_lock (&m->lock); | |
1017 | if (scm_is_false (m->owner)) | |
1018 | m->owner = thread; | |
1019 | else if (scm_is_eq (m->owner, thread)) | |
1020 | { | |
1021 | if (m->level >= 0) | |
1022 | m->level++; | |
1023 | else | |
1024 | msg = "mutex already locked by current thread"; | |
1025 | } | |
1026 | else | |
1027 | *resp = 0; | |
1028 | scm_i_pthread_mutex_unlock (&m->lock); | |
1029 | return msg; | |
1030 | } | |
1031 | ||
9bc4701c | 1032 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1033 | (SCM mutex), |
9bc4701c MD |
1034 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1035 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1036 | #define FUNC_NAME s_scm_try_mutex | |
1037 | { | |
9de87eea MV |
1038 | char *msg; |
1039 | int res; | |
1040 | ||
ba1b7223 | 1041 | SCM_VALIDATE_MUTEX (1, mutex); |
9bc4701c | 1042 | |
ba1b7223 | 1043 | msg = fat_mutex_trylock (SCM_MUTEX_DATA (mutex), &res); |
9de87eea MV |
1044 | if (msg) |
1045 | scm_misc_error (NULL, msg, SCM_EOL); | |
1046 | return scm_from_bool (res); | |
1047 | } | |
1048 | #undef FUNC_NAME | |
76da80e7 | 1049 | |
9de87eea MV |
1050 | static char * |
1051 | fat_mutex_unlock (fat_mutex *m) | |
1052 | { | |
1053 | char *msg = NULL; | |
1054 | ||
1055 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1056 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1057 | { |
9de87eea MV |
1058 | if (scm_is_false (m->owner)) |
1059 | msg = "mutex not locked"; | |
1060 | else | |
1061 | msg = "mutex not locked by current thread"; | |
9bc4701c | 1062 | } |
9de87eea MV |
1063 | else if (m->level > 0) |
1064 | m->level--; | |
1065 | else | |
1066 | m->owner = unblock_from_queue (m->waiting); | |
1067 | scm_i_pthread_mutex_unlock (&m->lock); | |
1068 | ||
1069 | return msg; | |
9bc4701c | 1070 | } |
9bc4701c MD |
1071 | |
1072 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
1073 | (SCM mx), | |
1074 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
1075 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1076 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1077 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1078 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1079 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1080 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
1081 | #define FUNC_NAME s_scm_unlock_mutex | |
1082 | { | |
9de87eea | 1083 | char *msg; |
9bc4701c MD |
1084 | SCM_VALIDATE_MUTEX (1, mx); |
1085 | ||
9de87eea MV |
1086 | msg = fat_mutex_unlock (SCM_MUTEX_DATA (mx)); |
1087 | if (msg) | |
1088 | scm_misc_error (NULL, msg, SCM_EOL); | |
9bc4701c MD |
1089 | return SCM_BOOL_T; |
1090 | } | |
1091 | #undef FUNC_NAME | |
1092 | ||
9de87eea MV |
1093 | #if 0 |
1094 | ||
1095 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1096 | (SCM mx), | |
1097 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1098 | #define FUNC_NAME s_scm_mutex_owner | |
1099 | { | |
1100 | SCM_VALIDATE_MUTEX (1, mx); | |
1101 | return (SCM_MUTEX_DATA(mx))->owner; | |
1102 | } | |
1103 | #undef FUNC_NAME | |
1104 | ||
1105 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1106 | (SCM mx), | |
1107 | "Return the lock level of a recursive mutex, or -1\n" | |
1108 | "for a standard mutex.") | |
1109 | #define FUNC_NAME s_scm_mutex_level | |
1110 | { | |
1111 | SCM_VALIDATE_MUTEX (1, mx); | |
1112 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1113 | } | |
1114 | #undef FUNC_NAME | |
1115 | ||
1116 | #endif | |
1117 | ||
1118 | /*** Fat condition variables */ | |
1119 | ||
1120 | typedef struct { | |
1121 | scm_i_pthread_mutex_t lock; | |
1122 | SCM waiting; /* the threads waiting for this condition. */ | |
1123 | } fat_cond; | |
1124 | ||
1125 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1126 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1127 | ||
1128 | static SCM | |
1129 | fat_cond_mark (SCM cv) | |
1130 | { | |
1131 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1132 | return c->waiting; | |
1133 | } | |
1134 | ||
1135 | static size_t | |
1136 | fat_cond_free (SCM mx) | |
1137 | { | |
1138 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1139 | scm_i_pthread_mutex_destroy (&c->lock); | |
1140 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int | |
1145 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1146 | { | |
1147 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1148 | scm_puts ("#<condition-variable ", port); | |
1149 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1150 | scm_puts (">", port); | |
1151 | return 1; | |
1152 | } | |
9bc4701c | 1153 | |
d823b11b MV |
1154 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1155 | (void), | |
1156 | "Make a new condition variable.") | |
1157 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1158 | { |
9de87eea MV |
1159 | fat_cond *c; |
1160 | SCM cv; | |
1161 | ||
1162 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1163 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1164 | c->waiting = SCM_EOL; | |
1165 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1166 | c->waiting = make_queue (); | |
d823b11b | 1167 | return cv; |
5f05c406 | 1168 | } |
d823b11b | 1169 | #undef FUNC_NAME |
5f05c406 | 1170 | |
9de87eea MV |
1171 | static int |
1172 | fat_cond_timedwait (SCM cond, SCM mutex, | |
1173 | const scm_t_timespec *waittime) | |
1174 | { | |
1175 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1176 | fat_cond *c = SCM_CONDVAR_DATA (cond); | |
1177 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1178 | const char *msg; | |
1179 | int err = 0; | |
1180 | ||
1181 | while (1) | |
1182 | { | |
9de87eea MV |
1183 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1184 | msg = fat_mutex_unlock (m); | |
1185 | t->block_asyncs++; | |
1186 | if (msg == NULL) | |
1187 | { | |
1188 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1189 | scm_i_pthread_mutex_unlock (&c->lock); | |
9de87eea MV |
1190 | fat_mutex_lock (mutex); |
1191 | } | |
1192 | else | |
1193 | scm_i_pthread_mutex_unlock (&c->lock); | |
1194 | t->block_asyncs--; | |
1195 | scm_async_click (); | |
1196 | ||
9de87eea MV |
1197 | if (msg) |
1198 | scm_misc_error (NULL, msg, SCM_EOL); | |
1199 | ||
1200 | scm_remember_upto_here_2 (cond, mutex); | |
1201 | ||
1202 | if (err == 0) | |
1203 | return 1; | |
1204 | if (err == ETIMEDOUT) | |
1205 | return 0; | |
1206 | if (err != EINTR) | |
1207 | { | |
1208 | errno = err; | |
1209 | scm_syserror (NULL); | |
1210 | } | |
1211 | } | |
1212 | } | |
1213 | ||
d823b11b MV |
1214 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1215 | (SCM cv, SCM mx, SCM t), | |
1216 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1217 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1218 | "is locked again when this function returns. When @var{time} is given, " | |
1219 | "it specifies a point in time where the waiting should be aborted. It " | |
1220 | "can be either a integer as returned by @code{current-time} or a pair " | |
1221 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1222 | "mutex is locked and @code{#f} is returned. When the condition " | |
1223 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1224 | "is returned. ") | |
1225 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1226 | { |
9de87eea | 1227 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1228 | |
1229 | SCM_VALIDATE_CONDVAR (1, cv); | |
1230 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1231 | |
d823b11b MV |
1232 | if (!SCM_UNBNDP (t)) |
1233 | { | |
d2e53ed6 | 1234 | if (scm_is_pair (t)) |
d823b11b | 1235 | { |
9de87eea MV |
1236 | waittime.tv_sec = scm_to_ulong (SCM_CAR (t)); |
1237 | waittime.tv_nsec = scm_to_ulong (SCM_CAR (t)) * 1000; | |
d823b11b MV |
1238 | } |
1239 | else | |
1240 | { | |
9de87eea | 1241 | waittime.tv_sec = scm_to_ulong (t); |
d823b11b MV |
1242 | waittime.tv_nsec = 0; |
1243 | } | |
9de87eea | 1244 | waitptr = &waittime; |
d823b11b MV |
1245 | } |
1246 | ||
9de87eea | 1247 | return scm_from_bool (fat_cond_timedwait (cv, mx, waitptr)); |
5f05c406 | 1248 | } |
d823b11b | 1249 | #undef FUNC_NAME |
5f05c406 | 1250 | |
9de87eea MV |
1251 | static void |
1252 | fat_cond_signal (fat_cond *c) | |
1253 | { | |
9de87eea MV |
1254 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1255 | unblock_from_queue (c->waiting); | |
1256 | scm_i_pthread_mutex_unlock (&c->lock); | |
1257 | } | |
1258 | ||
d823b11b MV |
1259 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1260 | (SCM cv), | |
1261 | "Wake up one thread that is waiting for @var{cv}") | |
1262 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1263 | { |
d823b11b | 1264 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1265 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1266 | return SCM_BOOL_T; |
5f05c406 | 1267 | } |
d823b11b | 1268 | #undef FUNC_NAME |
5f05c406 | 1269 | |
9de87eea MV |
1270 | static void |
1271 | fat_cond_broadcast (fat_cond *c) | |
1272 | { | |
1273 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1274 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1275 | ; | |
1276 | scm_i_pthread_mutex_unlock (&c->lock); | |
1277 | } | |
1278 | ||
d823b11b MV |
1279 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1280 | (SCM cv), | |
1281 | "Wake up all threads that are waiting for @var{cv}. ") | |
1282 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1283 | { |
d823b11b | 1284 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1285 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1286 | return SCM_BOOL_T; |
5f05c406 | 1287 | } |
d823b11b | 1288 | #undef FUNC_NAME |
5f05c406 | 1289 | |
d823b11b MV |
1290 | /*** Marking stacks */ |
1291 | ||
1292 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1293 | threads as well? | |
1294 | */ | |
1295 | #ifdef __ia64__ | |
1296 | # define SCM_MARK_BACKING_STORE() do { \ | |
1297 | ucontext_t ctx; \ | |
1298 | SCM_STACKITEM * top, * bot; \ | |
1299 | getcontext (&ctx); \ | |
1300 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1301 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1302 | / sizeof (SCM_STACKITEM))); \ | |
1303 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
1304 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
1305 | scm_mark_locations (bot, top - bot); } while (0) | |
1306 | #else | |
1307 | # define SCM_MARK_BACKING_STORE() | |
1308 | #endif | |
1309 | ||
1310 | void | |
1311 | scm_threads_mark_stacks (void) | |
5f05c406 | 1312 | { |
9de87eea MV |
1313 | scm_i_thread *t; |
1314 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1315 | { |
9de87eea MV |
1316 | /* Check that thread has indeed been suspended. |
1317 | */ | |
1318 | assert (t->top); | |
6087fad9 | 1319 | |
9de87eea | 1320 | scm_gc_mark (t->handle); |
6087fad9 | 1321 | |
d028af45 | 1322 | #if SCM_STACK_GROWS_UP |
9de87eea | 1323 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1324 | #else |
9de87eea | 1325 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1326 | #endif |
6087fad9 MV |
1327 | scm_mark_locations ((SCM_STACKITEM *) t->regs, |
1328 | ((size_t) sizeof(t->regs) | |
1329 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1330 | } |
59152722 MV |
1331 | |
1332 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1333 | } |
1334 | ||
d823b11b MV |
1335 | /*** Select */ |
1336 | ||
911782b7 | 1337 | int |
9de87eea MV |
1338 | scm_std_select (int nfds, |
1339 | SELECT_TYPE *readfds, | |
1340 | SELECT_TYPE *writefds, | |
1341 | SELECT_TYPE *exceptfds, | |
1342 | struct timeval *timeout) | |
1343 | { | |
1344 | fd_set my_readfds; | |
1345 | int res, eno, wakeup_fd; | |
1346 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1347 | scm_t_guile_ticket ticket; | |
1348 | ||
1349 | if (readfds == NULL) | |
1350 | { | |
1351 | FD_ZERO (&my_readfds); | |
1352 | readfds = &my_readfds; | |
1353 | } | |
1354 | ||
1355 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1356 | SCM_TICK; | |
1357 | ||
1358 | wakeup_fd = t->sleep_pipe[0]; | |
1359 | ticket = scm_leave_guile (); | |
1360 | FD_SET (wakeup_fd, readfds); | |
1361 | if (wakeup_fd >= nfds) | |
1362 | nfds = wakeup_fd+1; | |
1363 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1364 | t->sleep_fd = -1; | |
d823b11b | 1365 | eno = errno; |
9de87eea MV |
1366 | scm_enter_guile (ticket); |
1367 | ||
1368 | scm_i_reset_sleep (t); | |
1369 | ||
1370 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1371 | { | |
1372 | char dummy; | |
1373 | read (wakeup_fd, &dummy, 1); | |
1374 | FD_CLR (wakeup_fd, readfds); | |
1375 | res -= 1; | |
1376 | if (res == 0) | |
1377 | { | |
1378 | eno = EINTR; | |
1379 | res = -1; | |
1380 | } | |
1381 | } | |
d823b11b MV |
1382 | errno = eno; |
1383 | return res; | |
5f05c406 MV |
1384 | } |
1385 | ||
9de87eea | 1386 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1387 | |
9de87eea | 1388 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1389 | |
9bc4701c | 1390 | int |
9de87eea | 1391 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1392 | { |
9de87eea MV |
1393 | scm_t_guile_ticket t = scm_leave_guile (); |
1394 | int res = scm_i_pthread_mutex_lock (mutex); | |
1395 | scm_enter_guile (t); | |
9bc4701c MD |
1396 | return res; |
1397 | } | |
1398 | ||
9de87eea MV |
1399 | static void |
1400 | unlock (void *data) | |
28d52ebb | 1401 | { |
9de87eea | 1402 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1403 | } |
1404 | ||
1405 | void | |
9de87eea | 1406 | scm_frame_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1407 | { |
9de87eea MV |
1408 | scm_i_scm_pthread_mutex_lock (mutex); |
1409 | scm_frame_unwind_handler (unlock, mutex, SCM_F_WIND_EXPLICITLY); | |
28d52ebb MD |
1410 | } |
1411 | ||
9bc4701c | 1412 | int |
9de87eea | 1413 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1414 | { |
9de87eea MV |
1415 | scm_t_guile_ticket t = scm_leave_guile (); |
1416 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1417 | scm_enter_guile (t); | |
9bc4701c MD |
1418 | return res; |
1419 | } | |
9bc4701c | 1420 | |
76da80e7 | 1421 | int |
9de87eea MV |
1422 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1423 | scm_i_pthread_mutex_t *mutex, | |
1424 | const scm_t_timespec *wt) | |
76da80e7 | 1425 | { |
9de87eea MV |
1426 | scm_t_guile_ticket t = scm_leave_guile (); |
1427 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1428 | scm_enter_guile (t); | |
1429 | return res; | |
76da80e7 MV |
1430 | } |
1431 | ||
9de87eea | 1432 | #endif |
76da80e7 | 1433 | |
d823b11b | 1434 | unsigned long |
9de87eea | 1435 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1436 | { |
d823b11b MV |
1437 | struct timeval tv; |
1438 | tv.tv_usec = usecs % 1000000; | |
1439 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1440 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1441 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1442 | } |
1443 | ||
9de87eea MV |
1444 | unsigned int |
1445 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1446 | { |
d823b11b MV |
1447 | struct timeval tv; |
1448 | tv.tv_usec = 0; | |
1449 | tv.tv_sec = secs; | |
9de87eea | 1450 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1451 | return tv.tv_sec; |
6c214b62 MD |
1452 | } |
1453 | ||
d823b11b MV |
1454 | /*** Misc */ |
1455 | ||
1456 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1457 | (void), | |
1458 | "Return the thread that called this function.") | |
1459 | #define FUNC_NAME s_scm_current_thread | |
1460 | { | |
9de87eea | 1461 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1462 | } |
1463 | #undef FUNC_NAME | |
1464 | ||
9de87eea MV |
1465 | static SCM |
1466 | scm_c_make_list (size_t n, SCM fill) | |
1467 | { | |
1468 | SCM res = SCM_EOL; | |
1469 | while (n-- > 0) | |
1470 | res = scm_cons (fill, res); | |
1471 | return res; | |
1472 | } | |
1473 | ||
d823b11b MV |
1474 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1475 | (void), | |
1476 | "Return a list of all threads.") | |
9bc4701c | 1477 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1478 | { |
9de87eea MV |
1479 | /* We can not allocate while holding the thread_admin_mutex because |
1480 | of the way GC is done. | |
1481 | */ | |
1482 | int n = thread_count; | |
1483 | scm_i_thread *t; | |
1484 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1485 | |
9de87eea MV |
1486 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1487 | l = &list; | |
1488 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1489 | { | |
1490 | SCM_SETCAR (*l, t->handle); | |
1491 | l = SCM_CDRLOC (*l); | |
1492 | n--; | |
1493 | } | |
1494 | *l = SCM_EOL; | |
1495 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1496 | return list; | |
d823b11b | 1497 | } |
9de87eea | 1498 | #undef FUNC_NAME |
d823b11b MV |
1499 | |
1500 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1501 | (SCM thread), | |
1502 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1503 | #define FUNC_NAME s_scm_thread_exited_p | |
1504 | { | |
7888309b | 1505 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1506 | } |
1507 | #undef FUNC_NAME | |
1508 | ||
911782b7 | 1509 | int |
d823b11b MV |
1510 | scm_c_thread_exited_p (SCM thread) |
1511 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1512 | { |
9de87eea | 1513 | scm_i_thread *t; |
d823b11b | 1514 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1515 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1516 | return t->exited; |
5f05c406 | 1517 | } |
d823b11b | 1518 | #undef FUNC_NAME |
5f05c406 | 1519 | |
9de87eea | 1520 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1521 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1522 | static int threads_initialized_p = 0; |
1523 | ||
1524 | void | |
1525 | scm_i_thread_put_to_sleep () | |
1526 | { | |
6087fad9 | 1527 | if (threads_initialized_p) |
9bc4701c | 1528 | { |
9de87eea | 1529 | scm_i_thread *t; |
6087fad9 | 1530 | |
9de87eea MV |
1531 | scm_leave_guile (); |
1532 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1533 | ||
0c97d7dd MV |
1534 | /* Signal all threads to go to sleep |
1535 | */ | |
1536 | scm_i_thread_go_to_sleep = 1; | |
1537 | for (t = all_threads; t; t = t->next_thread) | |
1538 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1539 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1540 | } |
1541 | } | |
1542 | ||
b0dc3d71 MD |
1543 | void |
1544 | scm_i_thread_invalidate_freelists () | |
1545 | { | |
9de87eea MV |
1546 | /* thread_admin_mutex is already locked. */ |
1547 | ||
1548 | scm_i_thread *t; | |
1549 | for (t = all_threads; t; t = t->next_thread) | |
1550 | if (t != SCM_I_CURRENT_THREAD) | |
1551 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1552 | } |
1553 | ||
9bc4701c MD |
1554 | void |
1555 | scm_i_thread_wake_up () | |
1556 | { | |
6087fad9 | 1557 | if (threads_initialized_p) |
9bc4701c | 1558 | { |
9de87eea | 1559 | scm_i_thread *t; |
9de87eea | 1560 | |
0c97d7dd MV |
1561 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1562 | for (t = all_threads; t; t = t->next_thread) | |
1563 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1564 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1565 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1566 | } |
9bc4701c MD |
1567 | } |
1568 | ||
1569 | void | |
1570 | scm_i_thread_sleep_for_gc () | |
1571 | { | |
9de87eea MV |
1572 | scm_i_thread *t = suspend (); |
1573 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1574 | resume (t); |
9bc4701c MD |
1575 | } |
1576 | ||
a4d106c7 MV |
1577 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1578 | */ | |
d1138028 | 1579 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1580 | int scm_i_critical_section_level = 0; |
1581 | ||
1582 | static SCM framed_critical_section_mutex; | |
a54a94b3 | 1583 | |
9bc4701c | 1584 | void |
a4d106c7 | 1585 | scm_frame_critical_section (SCM mutex) |
76da80e7 | 1586 | { |
a4d106c7 MV |
1587 | if (scm_is_false (mutex)) |
1588 | mutex = framed_critical_section_mutex; | |
1589 | scm_frame_lock_mutex (mutex); | |
9de87eea MV |
1590 | scm_frame_block_asyncs (); |
1591 | } | |
1592 | ||
1593 | /*** Initialization */ | |
1594 | ||
1595 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1596 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1597 | ||
d1138028 MV |
1598 | #if SCM_USE_PTHREAD_THREADS |
1599 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1600 | #endif | |
1601 | ||
9de87eea MV |
1602 | void |
1603 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1604 | { | |
d1138028 MV |
1605 | #if SCM_USE_PTHREAD_THREADS |
1606 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1607 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1608 | PTHREAD_MUTEX_RECURSIVE); | |
1609 | #endif | |
1610 | ||
1611 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1612 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1613 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1614 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1615 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1616 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1617 | ||
1618 | guilify_self_1 (base); | |
9bc4701c MD |
1619 | } |
1620 | ||
d823b11b MV |
1621 | scm_t_bits scm_tc16_thread; |
1622 | scm_t_bits scm_tc16_mutex; | |
1623 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1624 | |
7bfd3b9e | 1625 | void |
9de87eea | 1626 | scm_init_threads () |
7bfd3b9e | 1627 | { |
9de87eea | 1628 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
1629 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
1630 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
1631 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
1632 | ||
9de87eea MV |
1633 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
1634 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
1635 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
1636 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1637 | |
9de87eea MV |
1638 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1639 | sizeof (fat_cond)); | |
1640 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
1641 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
1642 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 1643 | |
9de87eea MV |
1644 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1645 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1646 | threads_initialized_p = 1; |
a4d106c7 MV |
1647 | |
1648 | framed_critical_section_mutex = | |
1649 | scm_permanent_object (scm_make_recursive_mutex ()); | |
7bfd3b9e | 1650 | } |
89e00824 | 1651 | |
5f05c406 | 1652 | void |
9de87eea | 1653 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1654 | { |
9de87eea MV |
1655 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1656 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1657 | } |
1658 | ||
d823b11b | 1659 | void |
9de87eea | 1660 | scm_init_thread_procs () |
d823b11b | 1661 | { |
9de87eea | 1662 | #include "libguile/threads.x" |
d823b11b MV |
1663 | } |
1664 | ||
89e00824 ML |
1665 | /* |
1666 | Local Variables: | |
1667 | c-file-style: "gnu" | |
1668 | End: | |
1669 | */ |