Commit | Line | Data |
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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 | { | |
23d72566 KR |
144 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
145 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
146 | the struct case, hence we go via a union, and extract according to the | |
147 | size of pthread_t. */ | |
148 | union { | |
149 | scm_i_pthread_t p; | |
150 | unsigned short us; | |
151 | unsigned int ui; | |
152 | unsigned long ul; | |
153 | scm_t_uintmax um; | |
154 | } u; | |
9de87eea | 155 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
156 | scm_i_pthread_t p = t->pthread; |
157 | scm_t_uintmax id; | |
158 | u.p = p; | |
159 | if (sizeof (p) == sizeof (unsigned short)) | |
160 | id = u.us; | |
161 | else if (sizeof (p) == sizeof (unsigned int)) | |
162 | id = u.ui; | |
163 | else if (sizeof (p) == sizeof (unsigned long)) | |
164 | id = u.ul; | |
165 | else | |
166 | id = u.um; | |
167 | ||
d823b11b | 168 | scm_puts ("#<thread ", port); |
23d72566 | 169 | scm_uintprint (id, 10, port); |
1b92fb6b | 170 | scm_puts (" (", port); |
0345e278 | 171 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 172 | scm_puts (")>", port); |
d823b11b MV |
173 | return 1; |
174 | } | |
175 | ||
176 | static size_t | |
177 | thread_free (SCM obj) | |
178 | { | |
9de87eea MV |
179 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
180 | assert (t->exited); | |
d823b11b MV |
181 | scm_gc_free (t, sizeof (*t), "thread"); |
182 | return 0; | |
183 | } | |
184 | ||
9de87eea | 185 | /*** Blocking on queues. */ |
f7eca35d | 186 | |
9de87eea MV |
187 | /* See also scm_i_queue_async_cell for how such a block is |
188 | interrputed. | |
189 | */ | |
d823b11b | 190 | |
9de87eea MV |
191 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
192 | be woken up by a call to 'unblock_from_queue', or to be | |
193 | interrupted. Upon return of this function, the current thread is | |
194 | no longer on QUEUE, even when the sleep has been interrupted. | |
195 | ||
196 | The QUEUE data structure is assumed to be protected by MUTEX and | |
197 | the caller of block_self must hold MUTEX. It will be atomically | |
198 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
199 | ||
200 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
201 | as MUTEX is needed. | |
202 | ||
203 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
204 | ||
205 | The return value of block_self is an errno value. It will be zero | |
206 | when the sleep has been successfully completed by a call to | |
207 | unblock_from_queue, EINTR when it has been interrupted by the | |
208 | delivery of a system async, and ETIMEDOUT when the timeout has | |
209 | expired. | |
210 | ||
211 | The system asyncs themselves are not executed by block_self. | |
212 | */ | |
213 | static int | |
214 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
215 | const scm_t_timespec *waittime) | |
76da80e7 | 216 | { |
9de87eea MV |
217 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
218 | SCM q_handle; | |
219 | int err; | |
220 | ||
221 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
222 | err = EINTR; | |
223 | else | |
224 | { | |
225 | t->block_asyncs++; | |
226 | q_handle = enqueue (queue, t->handle); | |
227 | if (waittime == NULL) | |
228 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
229 | else | |
230 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
231 | ||
232 | /* When we are still on QUEUE, we have been interrupted. We | |
233 | report this only when no other error (such as a timeout) has | |
234 | happened above. | |
235 | */ | |
236 | if (remqueue (queue, q_handle) && err == 0) | |
237 | err = EINTR; | |
238 | t->block_asyncs--; | |
239 | scm_i_reset_sleep (t); | |
240 | } | |
241 | ||
242 | return err; | |
76da80e7 | 243 | } |
9de87eea MV |
244 | |
245 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
246 | the mutex that protects QUEUE. The awoken thread is returned, or | |
247 | #f when the queue was empty. | |
248 | */ | |
249 | static SCM | |
250 | unblock_from_queue (SCM queue) | |
251 | { | |
252 | SCM thread = dequeue (queue); | |
253 | if (scm_is_true (thread)) | |
254 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
255 | return thread; | |
256 | } | |
257 | ||
258 | /* Getting into and out of guile mode. | |
259 | */ | |
260 | ||
98648121 MV |
261 | /* Ken Raeburn observes that the implementation of suspend and resume |
262 | (and the things that build on top of them) are very likely not | |
263 | correct (see below). We will need fix this eventually, and that's | |
264 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
265 | ||
266 | Ken writes: | |
267 | ||
268 | Consider this sequence: | |
269 | ||
270 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
271 | through scm_leave_guile), which does this: | |
272 | ||
273 | // record top of stack for the GC | |
274 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
275 | var 't' | |
276 | // save registers. | |
277 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
278 | setjmp (t->regs); // here's most of the magic | |
279 | ||
280 | ... and returns. | |
281 | ||
282 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
283 | a caller-saved register R, and it's the only reference to the object | |
284 | currently. | |
285 | ||
286 | The compiler wants to use R in suspend, so it pushes the current | |
287 | value, X, into a stack slot which will be reloaded on exit from | |
288 | suspend; then it loads stuff into R and goes about its business. The | |
289 | setjmp call saves (some of) the current registers, including R, which | |
290 | no longer contains X. (This isn't a problem for a normal | |
291 | setjmp/longjmp situation, where longjmp would be called before | |
292 | setjmp's caller returns; the old value for X would be loaded back from | |
293 | the stack after the longjmp, before the function returned.) | |
294 | ||
295 | So, suspend returns, loading X back into R (and invalidating the jump | |
296 | buffer) in the process. The caller foo then goes off and calls a | |
297 | bunch of other functions out of Guile mode, occasionally storing X on | |
298 | the stack again, but, say, much deeper on the stack than suspend's | |
299 | stack frame went, and the stack slot where suspend had written X has | |
300 | long since been overwritten with other values. | |
301 | ||
302 | Okay, nothing actively broken so far. Now, let garbage collection | |
303 | run, triggered by another thread. | |
304 | ||
305 | The thread calling foo is out of Guile mode at the time, so the | |
306 | garbage collector just scans a range of stack addresses. Too bad that | |
307 | X isn't stored there. So the pointed-to storage goes onto the free | |
308 | list, and I think you can see where things go from there. | |
309 | ||
310 | Is there anything I'm missing that'll prevent this scenario from | |
311 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
312 | don't have many local variables, so they probably won't need to save | |
313 | any registers on most systems, so we hope everything will wind up in | |
314 | the jump buffer and we'll just get away with it"? | |
315 | ||
316 | (And, going the other direction, if scm_leave_guile and suspend push | |
317 | the stack pointer over onto a new page, and foo doesn't make further | |
318 | function calls and thus the stack pointer no longer includes that | |
319 | page, are we guaranteed that the kernel cannot release the now-unused | |
320 | stack page that contains the top-of-stack pointer we just saved? I | |
321 | don't know if any OS actually does that. If it does, we could get | |
322 | faults in garbage collection.) | |
323 | ||
324 | I don't think scm_without_guile has to have this problem, as it gets | |
325 | more control over the stack handling -- but it should call setjmp | |
326 | itself. I'd probably try something like: | |
327 | ||
328 | // record top of stack for the GC | |
329 | t->top = SCM_STACK_PTR (&t); | |
330 | // save registers. | |
331 | SCM_FLUSH_REGISTER_WINDOWS; | |
332 | setjmp (t->regs); | |
333 | res = func(data); | |
334 | scm_enter_guile (t); | |
335 | ||
336 | ... though even that's making some assumptions about the stack | |
337 | ordering of local variables versus caller-saved registers. | |
338 | ||
339 | For something like scm_leave_guile to work, I don't think it can just | |
340 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
341 | on the stack state at the point when the jump buffer was initialized, | |
342 | together, would work fine, but I think then we're talking about macros | |
343 | invoking setjmp in the caller's stack frame, and requiring that the | |
344 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
345 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
346 | in a function. (In fact, the pthread ones have to be paired up | |
347 | syntactically, as if they might expand to a compound statement | |
348 | incorporating the user's code, and invoking a compiler's | |
349 | exception-handling primitives. Which might be something to think | |
350 | about for cases where Guile is used with C++ exceptions or | |
351 | pthread_cancel.) | |
352 | */ | |
353 | ||
9de87eea MV |
354 | scm_i_pthread_key_t scm_i_thread_key; |
355 | ||
d823b11b | 356 | static void |
9de87eea | 357 | resume (scm_i_thread *t) |
d823b11b | 358 | { |
d823b11b | 359 | t->top = NULL; |
9bc4701c MD |
360 | if (t->clear_freelists_p) |
361 | { | |
362 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
363 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
364 | t->clear_freelists_p = 0; | |
365 | } | |
d823b11b MV |
366 | } |
367 | ||
98648121 MV |
368 | typedef void* scm_t_guile_ticket; |
369 | ||
370 | static void | |
9de87eea | 371 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 372 | { |
9de87eea MV |
373 | scm_i_thread *t = (scm_i_thread *)ticket; |
374 | if (t) | |
375 | { | |
376 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
377 | resume (t); | |
378 | } | |
d823b11b MV |
379 | } |
380 | ||
9de87eea MV |
381 | static scm_i_thread * |
382 | suspend (void) | |
d823b11b | 383 | { |
9de87eea | 384 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
385 | |
386 | /* record top of stack for the GC */ | |
9de87eea | 387 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
388 | /* save registers. */ |
389 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
390 | setjmp (t->regs); |
391 | return t; | |
d823b11b MV |
392 | } |
393 | ||
98648121 | 394 | static scm_t_guile_ticket |
9de87eea | 395 | scm_leave_guile () |
d823b11b | 396 | { |
9de87eea MV |
397 | scm_i_thread *t = suspend (); |
398 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
399 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
400 | } |
401 | ||
9de87eea MV |
402 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
403 | static scm_i_thread *all_threads = NULL; | |
404 | static int thread_count; | |
405 | ||
406 | static SCM scm_i_default_dynamic_state; | |
407 | ||
408 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 409 | */ |
9de87eea MV |
410 | static void |
411 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 412 | { |
9de87eea MV |
413 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
414 | ||
415 | t->pthread = scm_i_pthread_self (); | |
416 | t->handle = SCM_BOOL_F; | |
417 | t->result = SCM_BOOL_F; | |
418 | t->join_queue = SCM_EOL; | |
419 | t->dynamic_state = SCM_BOOL_F; | |
420 | t->dynwinds = SCM_EOL; | |
421 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
422 | t->block_asyncs = 1; |
423 | t->pending_asyncs = 1; | |
424 | t->last_debug_frame = NULL; | |
425 | t->base = base; | |
0c97d7dd | 426 | t->continuation_root = SCM_EOL; |
9de87eea MV |
427 | t->continuation_base = base; |
428 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
429 | t->sleep_mutex = NULL; | |
430 | t->sleep_object = SCM_BOOL_F; | |
431 | t->sleep_fd = -1; | |
0c97d7dd | 432 | /* XXX - check for errors. */ |
9de87eea MV |
433 | pipe (t->sleep_pipe); |
434 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
435 | t->clear_freelists_p = 0; | |
1a8fdd7e | 436 | t->gc_running_p = 0; |
9de87eea MV |
437 | t->exited = 0; |
438 | ||
439 | t->freelist = SCM_EOL; | |
440 | t->freelist2 = SCM_EOL; | |
441 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
442 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
443 | ||
444 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
445 | ||
446 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
447 | ||
448 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
449 | t->next_thread = all_threads; | |
450 | all_threads = t; | |
451 | thread_count++; | |
452 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
453 | } |
454 | ||
9de87eea | 455 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 456 | */ |
9de87eea MV |
457 | static void |
458 | guilify_self_2 (SCM parent) | |
d823b11b | 459 | { |
9de87eea MV |
460 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
461 | ||
462 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
463 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
464 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
465 | t->continuation_base = t->base; | |
466 | ||
467 | if (scm_is_true (parent)) | |
468 | t->dynamic_state = scm_make_dynamic_state (parent); | |
469 | else | |
470 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
471 | ||
472 | t->join_queue = make_queue (); | |
473 | t->block_asyncs = 0; | |
d823b11b MV |
474 | } |
475 | ||
9de87eea | 476 | /* Perform thread tear-down, in guile mode. |
d823b11b | 477 | */ |
9de87eea MV |
478 | static void * |
479 | do_thread_exit (void *v) | |
480 | { | |
0c97d7dd | 481 | scm_i_thread *t = (scm_i_thread *)v; |
9de87eea MV |
482 | |
483 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
484 | ||
485 | t->exited = 1; | |
0c97d7dd MV |
486 | close (t->sleep_pipe[0]); |
487 | close (t->sleep_pipe[1]); | |
9de87eea MV |
488 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
489 | ; | |
9de87eea MV |
490 | |
491 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
492 | return NULL; | |
493 | } | |
494 | ||
d823b11b | 495 | static void |
9de87eea | 496 | on_thread_exit (void *v) |
d823b11b | 497 | { |
29776e85 | 498 | /* This handler is executed in non-guile mode. */ |
0c97d7dd MV |
499 | scm_i_thread *t = (scm_i_thread *)v, **tp; |
500 | ||
9de87eea | 501 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd MV |
502 | |
503 | /* Unblocking the joining threads needs to happen in guile mode | |
29776e85 | 504 | since the queue is a SCM data structure. */ |
9de87eea | 505 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
506 | |
507 | /* Removing ourself from the list of all threads needs to happen in | |
508 | non-guile mode since all SCM values on our stack become | |
29776e85 | 509 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
510 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
511 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
512 | if (*tp == t) | |
513 | { | |
514 | *tp = t->next_thread; | |
515 | break; | |
516 | } | |
517 | thread_count--; | |
518 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
519 | ||
9de87eea | 520 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
521 | } |
522 | ||
9de87eea | 523 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 524 | |
9de87eea MV |
525 | static void |
526 | init_thread_key (void) | |
527 | { | |
528 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
529 | } | |
d823b11b | 530 | |
9de87eea MV |
531 | /* Perform any initializations necessary to bring the current thread |
532 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 533 | |
9de87eea MV |
534 | BASE is the stack base to use with GC. |
535 | ||
536 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
537 | which case the default dynamic state is used. | |
538 | ||
539 | Return zero when the thread was in guile mode already; otherwise | |
540 | return 1. | |
541 | */ | |
542 | ||
543 | static int | |
544 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 545 | { |
9de87eea MV |
546 | scm_i_thread *t; |
547 | ||
548 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
549 | ||
550 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
551 | { | |
552 | /* This thread has not been guilified yet. | |
553 | */ | |
554 | ||
555 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
556 | if (scm_initialized_p == 0) | |
557 | { | |
558 | /* First thread ever to enter Guile. Run the full | |
559 | initialization. | |
560 | */ | |
561 | scm_i_init_guile (base); | |
562 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
563 | } | |
564 | else | |
565 | { | |
566 | /* Guile is already initialized, but this thread enters it for | |
567 | the first time. Only initialize this thread. | |
568 | */ | |
569 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
570 | guilify_self_1 (base); | |
571 | guilify_self_2 (parent); | |
572 | } | |
573 | return 1; | |
574 | } | |
575 | else if (t->top) | |
576 | { | |
577 | /* This thread is already guilified but not in guile mode, just | |
578 | resume it. | |
579 | ||
580 | XXX - base might be lower than when this thread was first | |
581 | guilified. | |
582 | */ | |
583 | scm_enter_guile ((scm_t_guile_ticket) t); | |
584 | return 1; | |
585 | } | |
586 | else | |
587 | { | |
588 | /* Thread is already in guile mode. Nothing to do. | |
589 | */ | |
590 | return 0; | |
591 | } | |
d823b11b MV |
592 | } |
593 | ||
9de87eea | 594 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 595 | |
23d72566 KR |
596 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
597 | /* This method for GNU/Linux and perhaps some other systems. | |
598 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
599 | available on them. */ | |
9de87eea MV |
600 | #define HAVE_GET_THREAD_STACK_BASE |
601 | ||
602 | static SCM_STACKITEM * | |
603 | get_thread_stack_base () | |
d823b11b | 604 | { |
9de87eea MV |
605 | pthread_attr_t attr; |
606 | void *start, *end; | |
607 | size_t size; | |
608 | ||
9de87eea MV |
609 | pthread_getattr_np (pthread_self (), &attr); |
610 | pthread_attr_getstack (&attr, &start, &size); | |
611 | end = (char *)start + size; | |
612 | ||
2b829bbb KR |
613 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
614 | for the main thread, but we can use scm_get_stack_base in that | |
615 | case. | |
616 | */ | |
617 | ||
618 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 619 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 620 | return scm_get_stack_base (); |
9de87eea | 621 | else |
2b829bbb | 622 | #endif |
9de87eea MV |
623 | { |
624 | #if SCM_STACK_GROWS_UP | |
625 | return start; | |
626 | #else | |
627 | return end; | |
628 | #endif | |
629 | } | |
a54a94b3 MV |
630 | } |
631 | ||
23d72566 KR |
632 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
633 | /* This method for MacOS X. | |
634 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
635 | but as of 2006 there's nothing obvious at apple.com. */ | |
636 | #define HAVE_GET_THREAD_STACK_BASE | |
637 | static SCM_STACKITEM * | |
638 | get_thread_stack_base () | |
639 | { | |
640 | return pthread_get_stackaddr_np (pthread_self ()); | |
641 | } | |
642 | ||
643 | #elif defined (__MINGW32__) | |
644 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
645 | in any thread. We don't like hard-coding the name of a system, but there | |
646 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
647 | work. */ | |
648 | #define HAVE_GET_THREAD_STACK_BASE | |
649 | static SCM_STACKITEM * | |
650 | get_thread_stack_base () | |
651 | { | |
652 | return scm_get_stack_base (); | |
653 | } | |
654 | ||
655 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
656 | |
657 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
658 | ||
659 | #define HAVE_GET_THREAD_STACK_BASE | |
660 | ||
661 | static SCM_STACKITEM * | |
662 | get_thread_stack_base () | |
a54a94b3 | 663 | { |
2b829bbb | 664 | return scm_get_stack_base (); |
d823b11b MV |
665 | } |
666 | ||
9de87eea | 667 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
668 | |
669 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
670 | ||
671 | void | |
672 | scm_init_guile () | |
d823b11b | 673 | { |
9de87eea MV |
674 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
675 | scm_i_default_dynamic_state); | |
d823b11b MV |
676 | } |
677 | ||
9de87eea MV |
678 | #endif |
679 | ||
680 | void * | |
681 | scm_with_guile (void *(*func)(void *), void *data) | |
682 | { | |
683 | return scm_i_with_guile_and_parent (func, data, | |
684 | scm_i_default_dynamic_state); | |
685 | } | |
686 | ||
687 | void * | |
688 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, | |
689 | SCM parent) | |
690 | { | |
691 | void *res; | |
692 | int really_entered; | |
693 | SCM_STACKITEM base_item; | |
694 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); | |
695 | res = scm_c_with_continuation_barrier (func, data); | |
696 | if (really_entered) | |
697 | scm_leave_guile (); | |
698 | return res; | |
699 | } | |
700 | ||
701 | void * | |
702 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 703 | { |
9de87eea MV |
704 | void *res; |
705 | scm_t_guile_ticket t; | |
706 | t = scm_leave_guile (); | |
707 | res = func (data); | |
708 | scm_enter_guile (t); | |
709 | return res; | |
710 | } | |
711 | ||
712 | /*** Thread creation */ | |
713 | ||
714 | typedef struct { | |
715 | SCM parent; | |
716 | SCM thunk; | |
717 | SCM handler; | |
76da80e7 | 718 | SCM thread; |
9de87eea MV |
719 | scm_i_pthread_mutex_t mutex; |
720 | scm_i_pthread_cond_t cond; | |
721 | } launch_data; | |
d823b11b | 722 | |
9de87eea MV |
723 | static void * |
724 | really_launch (void *d) | |
725 | { | |
726 | launch_data *data = (launch_data *)d; | |
727 | SCM thunk = data->thunk, handler = data->handler; | |
728 | scm_i_thread *t; | |
d823b11b | 729 | |
9de87eea | 730 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 731 | |
9de87eea MV |
732 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
733 | data->thread = scm_current_thread (); | |
734 | scm_i_pthread_cond_signal (&data->cond); | |
735 | scm_i_pthread_mutex_unlock (&data->mutex); | |
736 | ||
737 | if (SCM_UNBNDP (handler)) | |
738 | t->result = scm_call_0 (thunk); | |
739 | else | |
740 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
741 | ||
742 | return 0; | |
d823b11b MV |
743 | } |
744 | ||
9de87eea MV |
745 | static void * |
746 | launch_thread (void *d) | |
747 | { | |
748 | launch_data *data = (launch_data *)d; | |
749 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
750 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
751 | return NULL; | |
752 | } | |
753 | ||
754 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 755 | (SCM thunk, SCM handler), |
9de87eea MV |
756 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
757 | "returning a new thread object representing the thread. The procedure\n" | |
758 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
759 | "\n" | |
760 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
761 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
762 | "handler. This catch is established inside the continuation barrier.\n" | |
763 | "\n" | |
764 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
765 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
766 | #define FUNC_NAME s_scm_call_with_new_thread |
767 | { | |
9de87eea MV |
768 | launch_data data; |
769 | scm_i_pthread_t id; | |
770 | int err; | |
d823b11b | 771 | |
9de87eea MV |
772 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
773 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
774 | handler, SCM_ARG2, FUNC_NAME); | |
775 | ||
776 | data.parent = scm_current_dynamic_state (); | |
777 | data.thunk = thunk; | |
778 | data.handler = handler; | |
779 | data.thread = SCM_BOOL_F; | |
780 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
781 | scm_i_pthread_cond_init (&data.cond, NULL); | |
782 | ||
783 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
784 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
785 | if (err) | |
786 | { | |
787 | scm_i_pthread_mutex_unlock (&data.mutex); | |
788 | errno = err; | |
789 | scm_syserror (NULL); | |
790 | } | |
791 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
792 | scm_i_pthread_mutex_unlock (&data.mutex); | |
793 | ||
794 | return data.thread; | |
d823b11b MV |
795 | } |
796 | #undef FUNC_NAME | |
797 | ||
9de87eea MV |
798 | typedef struct { |
799 | SCM parent; | |
800 | scm_t_catch_body body; | |
801 | void *body_data; | |
802 | scm_t_catch_handler handler; | |
803 | void *handler_data; | |
804 | SCM thread; | |
805 | scm_i_pthread_mutex_t mutex; | |
806 | scm_i_pthread_cond_t cond; | |
807 | } spawn_data; | |
808 | ||
809 | static void * | |
810 | really_spawn (void *d) | |
811 | { | |
812 | spawn_data *data = (spawn_data *)d; | |
813 | scm_t_catch_body body = data->body; | |
814 | void *body_data = data->body_data; | |
815 | scm_t_catch_handler handler = data->handler; | |
816 | void *handler_data = data->handler_data; | |
817 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
818 | ||
819 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
820 | data->thread = scm_current_thread (); | |
821 | scm_i_pthread_cond_signal (&data->cond); | |
822 | scm_i_pthread_mutex_unlock (&data->mutex); | |
823 | ||
824 | if (handler == NULL) | |
825 | t->result = body (body_data); | |
826 | else | |
827 | t->result = scm_internal_catch (SCM_BOOL_T, | |
828 | body, body_data, | |
829 | handler, handler_data); | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | static void * | |
835 | spawn_thread (void *d) | |
836 | { | |
837 | spawn_data *data = (spawn_data *)d; | |
838 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
839 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
840 | return NULL; | |
841 | } | |
842 | ||
843 | SCM | |
844 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
845 | scm_t_catch_handler handler, void *handler_data) | |
846 | { | |
847 | spawn_data data; | |
848 | scm_i_pthread_t id; | |
849 | int err; | |
850 | ||
851 | data.parent = scm_current_dynamic_state (); | |
852 | data.body = body; | |
853 | data.body_data = body_data; | |
854 | data.handler = handler; | |
855 | data.handler_data = handler_data; | |
856 | data.thread = SCM_BOOL_F; | |
857 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
858 | scm_i_pthread_cond_init (&data.cond, NULL); | |
859 | ||
860 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
861 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
862 | if (err) | |
863 | { | |
864 | scm_i_pthread_mutex_unlock (&data.mutex); | |
865 | errno = err; | |
866 | scm_syserror (NULL); | |
867 | } | |
868 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
869 | scm_i_pthread_mutex_unlock (&data.mutex); | |
870 | ||
871 | return data.thread; | |
872 | } | |
873 | ||
29717c89 MD |
874 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
875 | (), | |
876 | "Move the calling thread to the end of the scheduling queue.") | |
877 | #define FUNC_NAME s_scm_yield | |
878 | { | |
9de87eea | 879 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
880 | } |
881 | #undef FUNC_NAME | |
882 | ||
d823b11b | 883 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 884 | (SCM thread), |
d823b11b MV |
885 | "Suspend execution of the calling thread until the target @var{thread} " |
886 | "terminates, unless the target @var{thread} has already terminated. ") | |
887 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 888 | { |
9de87eea | 889 | scm_i_thread *t; |
d823b11b MV |
890 | SCM res; |
891 | ||
892 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 893 | if (scm_is_eq (scm_current_thread (), thread)) |
d823b11b MV |
894 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); |
895 | ||
9de87eea MV |
896 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); |
897 | ||
898 | t = SCM_I_THREAD_DATA (thread); | |
d823b11b MV |
899 | if (!t->exited) |
900 | { | |
9de87eea MV |
901 | while (1) |
902 | { | |
903 | block_self (t->join_queue, thread, &thread_admin_mutex, NULL); | |
904 | if (t->exited) | |
905 | break; | |
906 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
907 | SCM_TICK; | |
908 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
909 | } | |
d823b11b MV |
910 | } |
911 | res = t->result; | |
9de87eea MV |
912 | |
913 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 914 | return res; |
5f05c406 MV |
915 | } |
916 | #undef FUNC_NAME | |
917 | ||
9de87eea | 918 | /*** Fat mutexes */ |
4079f87e | 919 | |
d823b11b MV |
920 | /* We implement our own mutex type since we want them to be 'fair', we |
921 | want to do fancy things while waiting for them (like running | |
9de87eea MV |
922 | asyncs) and we might want to add things that are nice for |
923 | debugging. | |
d823b11b | 924 | */ |
4079f87e | 925 | |
9de87eea MV |
926 | typedef struct { |
927 | scm_i_pthread_mutex_t lock; | |
d823b11b | 928 | SCM owner; |
9de87eea MV |
929 | int level; /* how much the owner owns us. |
930 | < 0 for non-recursive mutexes */ | |
931 | SCM waiting; /* the threads waiting for this mutex. */ | |
932 | } fat_mutex; | |
933 | ||
934 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
935 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
5f05c406 | 936 | |
d823b11b | 937 | static SCM |
9de87eea | 938 | fat_mutex_mark (SCM mx) |
d823b11b | 939 | { |
9de87eea | 940 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
941 | scm_gc_mark (m->owner); |
942 | return m->waiting; | |
943 | } | |
4079f87e | 944 | |
9de87eea MV |
945 | static size_t |
946 | fat_mutex_free (SCM mx) | |
76da80e7 | 947 | { |
9de87eea MV |
948 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
949 | scm_i_pthread_mutex_destroy (&m->lock); | |
950 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
951 | return 0; |
952 | } | |
953 | ||
954 | static int | |
9de87eea | 955 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 956 | { |
9de87eea MV |
957 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
958 | scm_puts ("#<mutex ", port); | |
959 | scm_uintprint ((scm_t_bits)m, 16, port); | |
960 | scm_puts (">", port); | |
961 | return 1; | |
76da80e7 MV |
962 | } |
963 | ||
76da80e7 | 964 | static SCM |
9de87eea | 965 | make_fat_mutex (int recursive) |
76da80e7 | 966 | { |
9de87eea MV |
967 | fat_mutex *m; |
968 | SCM mx; | |
969 | ||
970 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
971 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
972 | m->owner = SCM_BOOL_F; | |
973 | m->level = recursive? 0 : -1; | |
974 | m->waiting = SCM_EOL; | |
975 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
976 | m->waiting = make_queue (); | |
977 | return mx; | |
76da80e7 MV |
978 | } |
979 | ||
9de87eea | 980 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, |
76da80e7 | 981 | (void), |
9de87eea MV |
982 | "Create a new mutex. ") |
983 | #define FUNC_NAME s_scm_make_mutex | |
76da80e7 | 984 | { |
9de87eea | 985 | return make_fat_mutex (0); |
76da80e7 MV |
986 | } |
987 | #undef FUNC_NAME | |
988 | ||
9de87eea | 989 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 990 | (void), |
9de87eea MV |
991 | "Create a new recursive mutex. ") |
992 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 993 | { |
9de87eea | 994 | return make_fat_mutex (1); |
9bc4701c MD |
995 | } |
996 | #undef FUNC_NAME | |
997 | ||
9de87eea MV |
998 | static char * |
999 | fat_mutex_lock (SCM mutex) | |
1000 | { | |
1001 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1002 | SCM thread = scm_current_thread (); | |
1003 | char *msg = NULL; | |
1004 | ||
1005 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1006 | if (scm_is_false (m->owner)) | |
1007 | m->owner = thread; | |
1008 | else if (scm_is_eq (m->owner, thread)) | |
1009 | { | |
1010 | if (m->level >= 0) | |
1011 | m->level++; | |
1012 | else | |
1013 | msg = "mutex already locked by current thread"; | |
1014 | } | |
1015 | else | |
1016 | { | |
1017 | while (1) | |
1018 | { | |
1019 | block_self (m->waiting, mutex, &m->lock, NULL); | |
1020 | if (scm_is_eq (m->owner, thread)) | |
1021 | break; | |
1022 | scm_i_pthread_mutex_unlock (&m->lock); | |
1023 | SCM_TICK; | |
1024 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1025 | } | |
1026 | } | |
1027 | scm_i_pthread_mutex_unlock (&m->lock); | |
1028 | return msg; | |
1029 | } | |
1030 | ||
9bc4701c MD |
1031 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, |
1032 | (SCM mx), | |
1033 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
1034 | "blocks until the mutex becomes available. The function returns when " | |
1035 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1036 | "a thread already owns will succeed right away and will not block the " | |
1037 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
1038 | #define FUNC_NAME s_scm_lock_mutex | |
1039 | { | |
9de87eea | 1040 | char *msg; |
76da80e7 | 1041 | |
b01532af | 1042 | SCM_VALIDATE_MUTEX (1, mx); |
9de87eea MV |
1043 | msg = fat_mutex_lock (mx); |
1044 | if (msg) | |
1045 | scm_misc_error (NULL, msg, SCM_EOL); | |
76da80e7 | 1046 | return SCM_BOOL_T; |
9bc4701c | 1047 | } |
76da80e7 | 1048 | #undef FUNC_NAME |
9bc4701c | 1049 | |
a4d106c7 | 1050 | void |
661ae7ab | 1051 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1052 | { |
661ae7ab MV |
1053 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1054 | SCM_F_WIND_EXPLICITLY); | |
1055 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1056 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1057 | } |
1058 | ||
9de87eea MV |
1059 | static char * |
1060 | fat_mutex_trylock (fat_mutex *m, int *resp) | |
1061 | { | |
1062 | char *msg = NULL; | |
1063 | SCM thread = scm_current_thread (); | |
1064 | ||
1065 | *resp = 1; | |
1066 | scm_i_pthread_mutex_lock (&m->lock); | |
1067 | if (scm_is_false (m->owner)) | |
1068 | m->owner = thread; | |
1069 | else if (scm_is_eq (m->owner, thread)) | |
1070 | { | |
1071 | if (m->level >= 0) | |
1072 | m->level++; | |
1073 | else | |
1074 | msg = "mutex already locked by current thread"; | |
1075 | } | |
1076 | else | |
1077 | *resp = 0; | |
1078 | scm_i_pthread_mutex_unlock (&m->lock); | |
1079 | return msg; | |
1080 | } | |
1081 | ||
9bc4701c | 1082 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1083 | (SCM mutex), |
9bc4701c MD |
1084 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1085 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1086 | #define FUNC_NAME s_scm_try_mutex | |
1087 | { | |
9de87eea MV |
1088 | char *msg; |
1089 | int res; | |
1090 | ||
ba1b7223 | 1091 | SCM_VALIDATE_MUTEX (1, mutex); |
9bc4701c | 1092 | |
ba1b7223 | 1093 | msg = fat_mutex_trylock (SCM_MUTEX_DATA (mutex), &res); |
9de87eea MV |
1094 | if (msg) |
1095 | scm_misc_error (NULL, msg, SCM_EOL); | |
1096 | return scm_from_bool (res); | |
1097 | } | |
1098 | #undef FUNC_NAME | |
76da80e7 | 1099 | |
9de87eea MV |
1100 | static char * |
1101 | fat_mutex_unlock (fat_mutex *m) | |
1102 | { | |
1103 | char *msg = NULL; | |
1104 | ||
1105 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1106 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1107 | { |
9de87eea MV |
1108 | if (scm_is_false (m->owner)) |
1109 | msg = "mutex not locked"; | |
1110 | else | |
1111 | msg = "mutex not locked by current thread"; | |
9bc4701c | 1112 | } |
9de87eea MV |
1113 | else if (m->level > 0) |
1114 | m->level--; | |
1115 | else | |
1116 | m->owner = unblock_from_queue (m->waiting); | |
1117 | scm_i_pthread_mutex_unlock (&m->lock); | |
1118 | ||
1119 | return msg; | |
9bc4701c | 1120 | } |
9bc4701c MD |
1121 | |
1122 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
1123 | (SCM mx), | |
1124 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
1125 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1126 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1127 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1128 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1129 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1130 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
1131 | #define FUNC_NAME s_scm_unlock_mutex | |
1132 | { | |
9de87eea | 1133 | char *msg; |
9bc4701c MD |
1134 | SCM_VALIDATE_MUTEX (1, mx); |
1135 | ||
9de87eea MV |
1136 | msg = fat_mutex_unlock (SCM_MUTEX_DATA (mx)); |
1137 | if (msg) | |
1138 | scm_misc_error (NULL, msg, SCM_EOL); | |
9bc4701c MD |
1139 | return SCM_BOOL_T; |
1140 | } | |
1141 | #undef FUNC_NAME | |
1142 | ||
9de87eea MV |
1143 | #if 0 |
1144 | ||
1145 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1146 | (SCM mx), | |
1147 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1148 | #define FUNC_NAME s_scm_mutex_owner | |
1149 | { | |
1150 | SCM_VALIDATE_MUTEX (1, mx); | |
1151 | return (SCM_MUTEX_DATA(mx))->owner; | |
1152 | } | |
1153 | #undef FUNC_NAME | |
1154 | ||
1155 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1156 | (SCM mx), | |
1157 | "Return the lock level of a recursive mutex, or -1\n" | |
1158 | "for a standard mutex.") | |
1159 | #define FUNC_NAME s_scm_mutex_level | |
1160 | { | |
1161 | SCM_VALIDATE_MUTEX (1, mx); | |
1162 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1163 | } | |
1164 | #undef FUNC_NAME | |
1165 | ||
1166 | #endif | |
1167 | ||
1168 | /*** Fat condition variables */ | |
1169 | ||
1170 | typedef struct { | |
1171 | scm_i_pthread_mutex_t lock; | |
1172 | SCM waiting; /* the threads waiting for this condition. */ | |
1173 | } fat_cond; | |
1174 | ||
1175 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1176 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1177 | ||
1178 | static SCM | |
1179 | fat_cond_mark (SCM cv) | |
1180 | { | |
1181 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1182 | return c->waiting; | |
1183 | } | |
1184 | ||
1185 | static size_t | |
1186 | fat_cond_free (SCM mx) | |
1187 | { | |
1188 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1189 | scm_i_pthread_mutex_destroy (&c->lock); | |
1190 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | static int | |
1195 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1196 | { | |
1197 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1198 | scm_puts ("#<condition-variable ", port); | |
1199 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1200 | scm_puts (">", port); | |
1201 | return 1; | |
1202 | } | |
9bc4701c | 1203 | |
d823b11b MV |
1204 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1205 | (void), | |
1206 | "Make a new condition variable.") | |
1207 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1208 | { |
9de87eea MV |
1209 | fat_cond *c; |
1210 | SCM cv; | |
1211 | ||
1212 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1213 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1214 | c->waiting = SCM_EOL; | |
1215 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1216 | c->waiting = make_queue (); | |
d823b11b | 1217 | return cv; |
5f05c406 | 1218 | } |
d823b11b | 1219 | #undef FUNC_NAME |
5f05c406 | 1220 | |
9de87eea MV |
1221 | static int |
1222 | fat_cond_timedwait (SCM cond, SCM mutex, | |
1223 | const scm_t_timespec *waittime) | |
1224 | { | |
1225 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1226 | fat_cond *c = SCM_CONDVAR_DATA (cond); | |
1227 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1228 | const char *msg; | |
1229 | int err = 0; | |
1230 | ||
1231 | while (1) | |
1232 | { | |
9de87eea MV |
1233 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1234 | msg = fat_mutex_unlock (m); | |
1235 | t->block_asyncs++; | |
1236 | if (msg == NULL) | |
1237 | { | |
1238 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1239 | scm_i_pthread_mutex_unlock (&c->lock); | |
9de87eea MV |
1240 | fat_mutex_lock (mutex); |
1241 | } | |
1242 | else | |
1243 | scm_i_pthread_mutex_unlock (&c->lock); | |
1244 | t->block_asyncs--; | |
1245 | scm_async_click (); | |
1246 | ||
9de87eea MV |
1247 | if (msg) |
1248 | scm_misc_error (NULL, msg, SCM_EOL); | |
1249 | ||
1250 | scm_remember_upto_here_2 (cond, mutex); | |
1251 | ||
1252 | if (err == 0) | |
1253 | return 1; | |
1254 | if (err == ETIMEDOUT) | |
1255 | return 0; | |
1256 | if (err != EINTR) | |
1257 | { | |
1258 | errno = err; | |
1259 | scm_syserror (NULL); | |
1260 | } | |
1261 | } | |
1262 | } | |
1263 | ||
d823b11b MV |
1264 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1265 | (SCM cv, SCM mx, SCM t), | |
1266 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1267 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1268 | "is locked again when this function returns. When @var{time} is given, " | |
1269 | "it specifies a point in time where the waiting should be aborted. It " | |
1270 | "can be either a integer as returned by @code{current-time} or a pair " | |
1271 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1272 | "mutex is locked and @code{#f} is returned. When the condition " | |
1273 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1274 | "is returned. ") | |
1275 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1276 | { |
9de87eea | 1277 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1278 | |
1279 | SCM_VALIDATE_CONDVAR (1, cv); | |
1280 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1281 | |
d823b11b MV |
1282 | if (!SCM_UNBNDP (t)) |
1283 | { | |
d2e53ed6 | 1284 | if (scm_is_pair (t)) |
d823b11b | 1285 | { |
9de87eea MV |
1286 | waittime.tv_sec = scm_to_ulong (SCM_CAR (t)); |
1287 | waittime.tv_nsec = scm_to_ulong (SCM_CAR (t)) * 1000; | |
d823b11b MV |
1288 | } |
1289 | else | |
1290 | { | |
9de87eea | 1291 | waittime.tv_sec = scm_to_ulong (t); |
d823b11b MV |
1292 | waittime.tv_nsec = 0; |
1293 | } | |
9de87eea | 1294 | waitptr = &waittime; |
d823b11b MV |
1295 | } |
1296 | ||
9de87eea | 1297 | return scm_from_bool (fat_cond_timedwait (cv, mx, waitptr)); |
5f05c406 | 1298 | } |
d823b11b | 1299 | #undef FUNC_NAME |
5f05c406 | 1300 | |
9de87eea MV |
1301 | static void |
1302 | fat_cond_signal (fat_cond *c) | |
1303 | { | |
9de87eea MV |
1304 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1305 | unblock_from_queue (c->waiting); | |
1306 | scm_i_pthread_mutex_unlock (&c->lock); | |
1307 | } | |
1308 | ||
d823b11b MV |
1309 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1310 | (SCM cv), | |
1311 | "Wake up one thread that is waiting for @var{cv}") | |
1312 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1313 | { |
d823b11b | 1314 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1315 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1316 | return SCM_BOOL_T; |
5f05c406 | 1317 | } |
d823b11b | 1318 | #undef FUNC_NAME |
5f05c406 | 1319 | |
9de87eea MV |
1320 | static void |
1321 | fat_cond_broadcast (fat_cond *c) | |
1322 | { | |
1323 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1324 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1325 | ; | |
1326 | scm_i_pthread_mutex_unlock (&c->lock); | |
1327 | } | |
1328 | ||
d823b11b MV |
1329 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1330 | (SCM cv), | |
1331 | "Wake up all threads that are waiting for @var{cv}. ") | |
1332 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1333 | { |
d823b11b | 1334 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1335 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1336 | return SCM_BOOL_T; |
5f05c406 | 1337 | } |
d823b11b | 1338 | #undef FUNC_NAME |
5f05c406 | 1339 | |
d823b11b MV |
1340 | /*** Marking stacks */ |
1341 | ||
1342 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1343 | threads as well? | |
1344 | */ | |
1345 | #ifdef __ia64__ | |
1346 | # define SCM_MARK_BACKING_STORE() do { \ | |
1347 | ucontext_t ctx; \ | |
1348 | SCM_STACKITEM * top, * bot; \ | |
1349 | getcontext (&ctx); \ | |
1350 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1351 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1352 | / sizeof (SCM_STACKITEM))); \ | |
9a5fa6e9 NJ |
1353 | bot = (SCM_STACKITEM *) scm_ia64_register_backing_store_base (); \ |
1354 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ | |
d823b11b MV |
1355 | scm_mark_locations (bot, top - bot); } while (0) |
1356 | #else | |
1357 | # define SCM_MARK_BACKING_STORE() | |
1358 | #endif | |
1359 | ||
1360 | void | |
1361 | scm_threads_mark_stacks (void) | |
5f05c406 | 1362 | { |
9de87eea MV |
1363 | scm_i_thread *t; |
1364 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1365 | { |
9de87eea MV |
1366 | /* Check that thread has indeed been suspended. |
1367 | */ | |
1368 | assert (t->top); | |
6087fad9 | 1369 | |
9de87eea | 1370 | scm_gc_mark (t->handle); |
6087fad9 | 1371 | |
d028af45 | 1372 | #if SCM_STACK_GROWS_UP |
9de87eea | 1373 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1374 | #else |
9de87eea | 1375 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1376 | #endif |
6087fad9 MV |
1377 | scm_mark_locations ((SCM_STACKITEM *) t->regs, |
1378 | ((size_t) sizeof(t->regs) | |
1379 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1380 | } |
59152722 MV |
1381 | |
1382 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1383 | } |
1384 | ||
d823b11b MV |
1385 | /*** Select */ |
1386 | ||
911782b7 | 1387 | int |
9de87eea MV |
1388 | scm_std_select (int nfds, |
1389 | SELECT_TYPE *readfds, | |
1390 | SELECT_TYPE *writefds, | |
1391 | SELECT_TYPE *exceptfds, | |
1392 | struct timeval *timeout) | |
1393 | { | |
1394 | fd_set my_readfds; | |
1395 | int res, eno, wakeup_fd; | |
1396 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1397 | scm_t_guile_ticket ticket; | |
1398 | ||
1399 | if (readfds == NULL) | |
1400 | { | |
1401 | FD_ZERO (&my_readfds); | |
1402 | readfds = &my_readfds; | |
1403 | } | |
1404 | ||
1405 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1406 | SCM_TICK; | |
1407 | ||
1408 | wakeup_fd = t->sleep_pipe[0]; | |
1409 | ticket = scm_leave_guile (); | |
1410 | FD_SET (wakeup_fd, readfds); | |
1411 | if (wakeup_fd >= nfds) | |
1412 | nfds = wakeup_fd+1; | |
1413 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1414 | t->sleep_fd = -1; | |
d823b11b | 1415 | eno = errno; |
9de87eea MV |
1416 | scm_enter_guile (ticket); |
1417 | ||
1418 | scm_i_reset_sleep (t); | |
1419 | ||
1420 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1421 | { | |
1422 | char dummy; | |
1423 | read (wakeup_fd, &dummy, 1); | |
1424 | FD_CLR (wakeup_fd, readfds); | |
1425 | res -= 1; | |
1426 | if (res == 0) | |
1427 | { | |
1428 | eno = EINTR; | |
1429 | res = -1; | |
1430 | } | |
1431 | } | |
d823b11b MV |
1432 | errno = eno; |
1433 | return res; | |
5f05c406 MV |
1434 | } |
1435 | ||
9de87eea | 1436 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1437 | |
9de87eea | 1438 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1439 | |
9bc4701c | 1440 | int |
9de87eea | 1441 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1442 | { |
9de87eea MV |
1443 | scm_t_guile_ticket t = scm_leave_guile (); |
1444 | int res = scm_i_pthread_mutex_lock (mutex); | |
1445 | scm_enter_guile (t); | |
9bc4701c MD |
1446 | return res; |
1447 | } | |
1448 | ||
9de87eea | 1449 | static void |
2b829bbb | 1450 | do_unlock (void *data) |
28d52ebb | 1451 | { |
9de87eea | 1452 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1453 | } |
1454 | ||
1455 | void | |
661ae7ab | 1456 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1457 | { |
9de87eea | 1458 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1459 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1460 | } |
1461 | ||
9bc4701c | 1462 | int |
9de87eea | 1463 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1464 | { |
9de87eea MV |
1465 | scm_t_guile_ticket t = scm_leave_guile (); |
1466 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1467 | scm_enter_guile (t); | |
9bc4701c MD |
1468 | return res; |
1469 | } | |
9bc4701c | 1470 | |
76da80e7 | 1471 | int |
9de87eea MV |
1472 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1473 | scm_i_pthread_mutex_t *mutex, | |
1474 | const scm_t_timespec *wt) | |
76da80e7 | 1475 | { |
9de87eea MV |
1476 | scm_t_guile_ticket t = scm_leave_guile (); |
1477 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1478 | scm_enter_guile (t); | |
1479 | return res; | |
76da80e7 MV |
1480 | } |
1481 | ||
9de87eea | 1482 | #endif |
76da80e7 | 1483 | |
d823b11b | 1484 | unsigned long |
9de87eea | 1485 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1486 | { |
d823b11b MV |
1487 | struct timeval tv; |
1488 | tv.tv_usec = usecs % 1000000; | |
1489 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1490 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1491 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1492 | } |
1493 | ||
9de87eea MV |
1494 | unsigned int |
1495 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1496 | { |
d823b11b MV |
1497 | struct timeval tv; |
1498 | tv.tv_usec = 0; | |
1499 | tv.tv_sec = secs; | |
9de87eea | 1500 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1501 | return tv.tv_sec; |
6c214b62 MD |
1502 | } |
1503 | ||
d823b11b MV |
1504 | /*** Misc */ |
1505 | ||
1506 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1507 | (void), | |
1508 | "Return the thread that called this function.") | |
1509 | #define FUNC_NAME s_scm_current_thread | |
1510 | { | |
9de87eea | 1511 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1512 | } |
1513 | #undef FUNC_NAME | |
1514 | ||
9de87eea MV |
1515 | static SCM |
1516 | scm_c_make_list (size_t n, SCM fill) | |
1517 | { | |
1518 | SCM res = SCM_EOL; | |
1519 | while (n-- > 0) | |
1520 | res = scm_cons (fill, res); | |
1521 | return res; | |
1522 | } | |
1523 | ||
d823b11b MV |
1524 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1525 | (void), | |
1526 | "Return a list of all threads.") | |
9bc4701c | 1527 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1528 | { |
9de87eea MV |
1529 | /* We can not allocate while holding the thread_admin_mutex because |
1530 | of the way GC is done. | |
1531 | */ | |
1532 | int n = thread_count; | |
1533 | scm_i_thread *t; | |
1534 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1535 | |
9de87eea MV |
1536 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1537 | l = &list; | |
1538 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1539 | { | |
1540 | SCM_SETCAR (*l, t->handle); | |
1541 | l = SCM_CDRLOC (*l); | |
1542 | n--; | |
1543 | } | |
1544 | *l = SCM_EOL; | |
1545 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1546 | return list; | |
d823b11b | 1547 | } |
9de87eea | 1548 | #undef FUNC_NAME |
d823b11b MV |
1549 | |
1550 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1551 | (SCM thread), | |
1552 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1553 | #define FUNC_NAME s_scm_thread_exited_p | |
1554 | { | |
7888309b | 1555 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1556 | } |
1557 | #undef FUNC_NAME | |
1558 | ||
911782b7 | 1559 | int |
d823b11b MV |
1560 | scm_c_thread_exited_p (SCM thread) |
1561 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1562 | { |
9de87eea | 1563 | scm_i_thread *t; |
d823b11b | 1564 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1565 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1566 | return t->exited; |
5f05c406 | 1567 | } |
d823b11b | 1568 | #undef FUNC_NAME |
5f05c406 | 1569 | |
9de87eea | 1570 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1571 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1572 | static int threads_initialized_p = 0; |
1573 | ||
1574 | void | |
1575 | scm_i_thread_put_to_sleep () | |
1576 | { | |
6087fad9 | 1577 | if (threads_initialized_p) |
9bc4701c | 1578 | { |
9de87eea | 1579 | scm_i_thread *t; |
6087fad9 | 1580 | |
9de87eea MV |
1581 | scm_leave_guile (); |
1582 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1583 | ||
0c97d7dd MV |
1584 | /* Signal all threads to go to sleep |
1585 | */ | |
1586 | scm_i_thread_go_to_sleep = 1; | |
1587 | for (t = all_threads; t; t = t->next_thread) | |
1588 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1589 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1590 | } |
1591 | } | |
1592 | ||
b0dc3d71 MD |
1593 | void |
1594 | scm_i_thread_invalidate_freelists () | |
1595 | { | |
9de87eea MV |
1596 | /* thread_admin_mutex is already locked. */ |
1597 | ||
1598 | scm_i_thread *t; | |
1599 | for (t = all_threads; t; t = t->next_thread) | |
1600 | if (t != SCM_I_CURRENT_THREAD) | |
1601 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1602 | } |
1603 | ||
9bc4701c MD |
1604 | void |
1605 | scm_i_thread_wake_up () | |
1606 | { | |
6087fad9 | 1607 | if (threads_initialized_p) |
9bc4701c | 1608 | { |
9de87eea | 1609 | scm_i_thread *t; |
9de87eea | 1610 | |
0c97d7dd MV |
1611 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1612 | for (t = all_threads; t; t = t->next_thread) | |
1613 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1614 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1615 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1616 | } |
9bc4701c MD |
1617 | } |
1618 | ||
1619 | void | |
1620 | scm_i_thread_sleep_for_gc () | |
1621 | { | |
9de87eea MV |
1622 | scm_i_thread *t = suspend (); |
1623 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1624 | resume (t); |
9bc4701c MD |
1625 | } |
1626 | ||
a4d106c7 MV |
1627 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1628 | */ | |
d1138028 | 1629 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1630 | int scm_i_critical_section_level = 0; |
1631 | ||
661ae7ab | 1632 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1633 | |
9bc4701c | 1634 | void |
661ae7ab | 1635 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1636 | { |
a4d106c7 | 1637 | if (scm_is_false (mutex)) |
661ae7ab MV |
1638 | mutex = dynwind_critical_section_mutex; |
1639 | scm_dynwind_lock_mutex (mutex); | |
1640 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1641 | } |
1642 | ||
1643 | /*** Initialization */ | |
1644 | ||
1645 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1646 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1647 | ||
d1138028 MV |
1648 | #if SCM_USE_PTHREAD_THREADS |
1649 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1650 | #endif | |
1651 | ||
9de87eea MV |
1652 | void |
1653 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1654 | { | |
d1138028 MV |
1655 | #if SCM_USE_PTHREAD_THREADS |
1656 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1657 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1658 | PTHREAD_MUTEX_RECURSIVE); | |
1659 | #endif | |
1660 | ||
1661 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1662 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1663 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1664 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1665 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1666 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1667 | ||
1668 | guilify_self_1 (base); | |
9bc4701c MD |
1669 | } |
1670 | ||
d823b11b MV |
1671 | scm_t_bits scm_tc16_thread; |
1672 | scm_t_bits scm_tc16_mutex; | |
1673 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1674 | |
7bfd3b9e | 1675 | void |
9de87eea | 1676 | scm_init_threads () |
7bfd3b9e | 1677 | { |
9de87eea | 1678 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
1679 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
1680 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
1681 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
1682 | ||
9de87eea MV |
1683 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
1684 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
1685 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
1686 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1687 | |
9de87eea MV |
1688 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1689 | sizeof (fat_cond)); | |
1690 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
1691 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
1692 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 1693 | |
9de87eea MV |
1694 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1695 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1696 | threads_initialized_p = 1; |
a4d106c7 | 1697 | |
661ae7ab | 1698 | dynwind_critical_section_mutex = |
a4d106c7 | 1699 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 1700 | } |
89e00824 | 1701 | |
5f05c406 | 1702 | void |
9de87eea | 1703 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1704 | { |
9de87eea MV |
1705 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1706 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1707 | } |
1708 | ||
d823b11b | 1709 | void |
9de87eea | 1710 | scm_init_thread_procs () |
d823b11b | 1711 | { |
9de87eea | 1712 | #include "libguile/threads.x" |
d823b11b MV |
1713 | } |
1714 | ||
89e00824 ML |
1715 | /* |
1716 | Local Variables: | |
1717 | c-file-style: "gnu" | |
1718 | End: | |
1719 | */ |