Commit | Line | Data |
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2e77f720 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007 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 | |
e7bca227 | 23 | #include "libguile/boehm-gc.h" |
1810dc4e RB |
24 | #include "libguile/_scm.h" |
25 | ||
fcc5d734 | 26 | #if HAVE_UNISTD_H |
d823b11b | 27 | #include <unistd.h> |
fcc5d734 | 28 | #endif |
d823b11b MV |
29 | #include <stdio.h> |
30 | #include <assert.h> | |
8ab3d8a0 KR |
31 | |
32 | #ifdef HAVE_STRING_H | |
33 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
34 | #endif | |
35 | ||
fcc5d734 | 36 | #if HAVE_SYS_TIME_H |
d823b11b | 37 | #include <sys/time.h> |
fcc5d734 | 38 | #endif |
5f05c406 | 39 | |
d823b11b MV |
40 | #include "libguile/validate.h" |
41 | #include "libguile/root.h" | |
42 | #include "libguile/eval.h" | |
43 | #include "libguile/async.h" | |
44 | #include "libguile/ports.h" | |
45 | #include "libguile/threads.h" | |
a0599745 | 46 | #include "libguile/dynwind.h" |
d823b11b | 47 | #include "libguile/iselect.h" |
9de87eea MV |
48 | #include "libguile/fluids.h" |
49 | #include "libguile/continuations.h" | |
2b829bbb | 50 | #include "libguile/gc.h" |
9de87eea | 51 | #include "libguile/init.h" |
2e77f720 | 52 | #include "libguile/scmsigs.h" |
7bfd3b9e | 53 | |
ecc9f40f MV |
54 | #ifdef __MINGW32__ |
55 | #ifndef ETIMEDOUT | |
56 | # define ETIMEDOUT WSAETIMEDOUT | |
57 | #endif | |
58 | # include <fcntl.h> | |
59 | # include <process.h> | |
60 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
61 | #endif /* __MINGW32__ */ | |
62 | ||
d823b11b | 63 | /*** Queues */ |
7bfd3b9e | 64 | |
9de87eea MV |
65 | /* Make an empty queue data structure. |
66 | */ | |
d823b11b MV |
67 | static SCM |
68 | make_queue () | |
69 | { | |
70 | return scm_cons (SCM_EOL, SCM_EOL); | |
71 | } | |
7bfd3b9e | 72 | |
9de87eea MV |
73 | /* Put T at the back of Q and return a handle that can be used with |
74 | remqueue to remove T from Q again. | |
75 | */ | |
d823b11b MV |
76 | static SCM |
77 | enqueue (SCM q, SCM t) | |
78 | { | |
79 | SCM c = scm_cons (t, SCM_EOL); | |
d2e53ed6 | 80 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
81 | SCM_SETCDR (q, c); |
82 | else | |
83 | SCM_SETCDR (SCM_CAR (q), c); | |
84 | SCM_SETCAR (q, c); | |
85 | return c; | |
86 | } | |
7bfd3b9e | 87 | |
9de87eea MV |
88 | /* Remove the element that the handle C refers to from the queue Q. C |
89 | must have been returned from a call to enqueue. The return value | |
90 | is zero when the element referred to by C has already been removed. | |
91 | Otherwise, 1 is returned. | |
92 | */ | |
93 | static int | |
d823b11b MV |
94 | remqueue (SCM q, SCM c) |
95 | { | |
96 | SCM p, prev = q; | |
d2e53ed6 | 97 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 98 | { |
bc36d050 | 99 | if (scm_is_eq (p, c)) |
d823b11b | 100 | { |
bc36d050 | 101 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
102 | SCM_SETCAR (q, SCM_CDR (c)); |
103 | SCM_SETCDR (prev, SCM_CDR (c)); | |
9de87eea | 104 | return 1; |
d823b11b MV |
105 | } |
106 | prev = p; | |
107 | } | |
9de87eea | 108 | return 0; |
d823b11b MV |
109 | } |
110 | ||
9de87eea MV |
111 | /* Remove the front-most element from the queue Q and return it. |
112 | Return SCM_BOOL_F when Q is empty. | |
113 | */ | |
d823b11b MV |
114 | static SCM |
115 | dequeue (SCM q) | |
116 | { | |
117 | SCM c = SCM_CDR (q); | |
d2e53ed6 | 118 | if (scm_is_null (c)) |
d823b11b MV |
119 | return SCM_BOOL_F; |
120 | else | |
121 | { | |
122 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 123 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
124 | SCM_SETCAR (q, SCM_EOL); |
125 | return SCM_CAR (c); | |
126 | } | |
127 | } | |
7bfd3b9e | 128 | |
9de87eea | 129 | /*** Thread smob routines */ |
76da80e7 | 130 | |
d823b11b MV |
131 | |
132 | static int | |
133 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
134 | { | |
23d72566 KR |
135 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
136 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
137 | the struct case, hence we go via a union, and extract according to the | |
138 | size of pthread_t. */ | |
139 | union { | |
140 | scm_i_pthread_t p; | |
141 | unsigned short us; | |
142 | unsigned int ui; | |
143 | unsigned long ul; | |
144 | scm_t_uintmax um; | |
145 | } u; | |
9de87eea | 146 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
147 | scm_i_pthread_t p = t->pthread; |
148 | scm_t_uintmax id; | |
149 | u.p = p; | |
150 | if (sizeof (p) == sizeof (unsigned short)) | |
151 | id = u.us; | |
152 | else if (sizeof (p) == sizeof (unsigned int)) | |
153 | id = u.ui; | |
154 | else if (sizeof (p) == sizeof (unsigned long)) | |
155 | id = u.ul; | |
156 | else | |
157 | id = u.um; | |
158 | ||
d823b11b | 159 | scm_puts ("#<thread ", port); |
23d72566 | 160 | scm_uintprint (id, 10, port); |
1b92fb6b | 161 | scm_puts (" (", port); |
0345e278 | 162 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 163 | scm_puts (")>", port); |
d823b11b MV |
164 | return 1; |
165 | } | |
166 | ||
167 | static size_t | |
168 | thread_free (SCM obj) | |
169 | { | |
9de87eea MV |
170 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
171 | assert (t->exited); | |
d823b11b MV |
172 | scm_gc_free (t, sizeof (*t), "thread"); |
173 | return 0; | |
174 | } | |
175 | ||
9de87eea | 176 | /*** Blocking on queues. */ |
f7eca35d | 177 | |
9de87eea MV |
178 | /* See also scm_i_queue_async_cell for how such a block is |
179 | interrputed. | |
180 | */ | |
d823b11b | 181 | |
9de87eea MV |
182 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
183 | be woken up by a call to 'unblock_from_queue', or to be | |
184 | interrupted. Upon return of this function, the current thread is | |
185 | no longer on QUEUE, even when the sleep has been interrupted. | |
186 | ||
187 | The QUEUE data structure is assumed to be protected by MUTEX and | |
188 | the caller of block_self must hold MUTEX. It will be atomically | |
189 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
190 | ||
191 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
192 | as MUTEX is needed. | |
193 | ||
194 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
195 | ||
196 | The return value of block_self is an errno value. It will be zero | |
197 | when the sleep has been successfully completed by a call to | |
198 | unblock_from_queue, EINTR when it has been interrupted by the | |
199 | delivery of a system async, and ETIMEDOUT when the timeout has | |
200 | expired. | |
201 | ||
202 | The system asyncs themselves are not executed by block_self. | |
203 | */ | |
204 | static int | |
205 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
206 | const scm_t_timespec *waittime) | |
76da80e7 | 207 | { |
9de87eea MV |
208 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
209 | SCM q_handle; | |
210 | int err; | |
211 | ||
212 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
213 | err = EINTR; | |
214 | else | |
215 | { | |
216 | t->block_asyncs++; | |
217 | q_handle = enqueue (queue, t->handle); | |
218 | if (waittime == NULL) | |
219 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
220 | else | |
221 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
222 | ||
223 | /* When we are still on QUEUE, we have been interrupted. We | |
224 | report this only when no other error (such as a timeout) has | |
225 | happened above. | |
226 | */ | |
227 | if (remqueue (queue, q_handle) && err == 0) | |
228 | err = EINTR; | |
229 | t->block_asyncs--; | |
230 | scm_i_reset_sleep (t); | |
231 | } | |
232 | ||
233 | return err; | |
76da80e7 | 234 | } |
9de87eea MV |
235 | |
236 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
237 | the mutex that protects QUEUE. The awoken thread is returned, or | |
238 | #f when the queue was empty. | |
239 | */ | |
240 | static SCM | |
241 | unblock_from_queue (SCM queue) | |
242 | { | |
243 | SCM thread = dequeue (queue); | |
244 | if (scm_is_true (thread)) | |
245 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
246 | return thread; | |
247 | } | |
248 | ||
249 | /* Getting into and out of guile mode. | |
250 | */ | |
251 | ||
98648121 MV |
252 | /* Ken Raeburn observes that the implementation of suspend and resume |
253 | (and the things that build on top of them) are very likely not | |
254 | correct (see below). We will need fix this eventually, and that's | |
255 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
256 | ||
257 | Ken writes: | |
258 | ||
259 | Consider this sequence: | |
260 | ||
261 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
262 | through scm_leave_guile), which does this: | |
263 | ||
264 | // record top of stack for the GC | |
265 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
266 | var 't' | |
267 | // save registers. | |
268 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
269 | setjmp (t->regs); // here's most of the magic | |
270 | ||
271 | ... and returns. | |
272 | ||
273 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
274 | a caller-saved register R, and it's the only reference to the object | |
275 | currently. | |
276 | ||
277 | The compiler wants to use R in suspend, so it pushes the current | |
278 | value, X, into a stack slot which will be reloaded on exit from | |
279 | suspend; then it loads stuff into R and goes about its business. The | |
280 | setjmp call saves (some of) the current registers, including R, which | |
281 | no longer contains X. (This isn't a problem for a normal | |
282 | setjmp/longjmp situation, where longjmp would be called before | |
283 | setjmp's caller returns; the old value for X would be loaded back from | |
284 | the stack after the longjmp, before the function returned.) | |
285 | ||
286 | So, suspend returns, loading X back into R (and invalidating the jump | |
287 | buffer) in the process. The caller foo then goes off and calls a | |
288 | bunch of other functions out of Guile mode, occasionally storing X on | |
289 | the stack again, but, say, much deeper on the stack than suspend's | |
290 | stack frame went, and the stack slot where suspend had written X has | |
291 | long since been overwritten with other values. | |
292 | ||
293 | Okay, nothing actively broken so far. Now, let garbage collection | |
294 | run, triggered by another thread. | |
295 | ||
296 | The thread calling foo is out of Guile mode at the time, so the | |
297 | garbage collector just scans a range of stack addresses. Too bad that | |
298 | X isn't stored there. So the pointed-to storage goes onto the free | |
299 | list, and I think you can see where things go from there. | |
300 | ||
301 | Is there anything I'm missing that'll prevent this scenario from | |
302 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
303 | don't have many local variables, so they probably won't need to save | |
304 | any registers on most systems, so we hope everything will wind up in | |
305 | the jump buffer and we'll just get away with it"? | |
306 | ||
307 | (And, going the other direction, if scm_leave_guile and suspend push | |
308 | the stack pointer over onto a new page, and foo doesn't make further | |
309 | function calls and thus the stack pointer no longer includes that | |
310 | page, are we guaranteed that the kernel cannot release the now-unused | |
311 | stack page that contains the top-of-stack pointer we just saved? I | |
312 | don't know if any OS actually does that. If it does, we could get | |
313 | faults in garbage collection.) | |
314 | ||
315 | I don't think scm_without_guile has to have this problem, as it gets | |
316 | more control over the stack handling -- but it should call setjmp | |
317 | itself. I'd probably try something like: | |
318 | ||
319 | // record top of stack for the GC | |
320 | t->top = SCM_STACK_PTR (&t); | |
321 | // save registers. | |
322 | SCM_FLUSH_REGISTER_WINDOWS; | |
323 | setjmp (t->regs); | |
324 | res = func(data); | |
325 | scm_enter_guile (t); | |
326 | ||
327 | ... though even that's making some assumptions about the stack | |
328 | ordering of local variables versus caller-saved registers. | |
329 | ||
330 | For something like scm_leave_guile to work, I don't think it can just | |
331 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
332 | on the stack state at the point when the jump buffer was initialized, | |
333 | together, would work fine, but I think then we're talking about macros | |
334 | invoking setjmp in the caller's stack frame, and requiring that the | |
335 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
336 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
337 | in a function. (In fact, the pthread ones have to be paired up | |
338 | syntactically, as if they might expand to a compound statement | |
339 | incorporating the user's code, and invoking a compiler's | |
340 | exception-handling primitives. Which might be something to think | |
341 | about for cases where Guile is used with C++ exceptions or | |
342 | pthread_cancel.) | |
343 | */ | |
344 | ||
9de87eea MV |
345 | scm_i_pthread_key_t scm_i_thread_key; |
346 | ||
d823b11b | 347 | static void |
9de87eea | 348 | resume (scm_i_thread *t) |
d823b11b | 349 | { |
d823b11b | 350 | t->top = NULL; |
9bc4701c MD |
351 | if (t->clear_freelists_p) |
352 | { | |
353 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
354 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
355 | t->clear_freelists_p = 0; | |
356 | } | |
d823b11b MV |
357 | } |
358 | ||
98648121 MV |
359 | typedef void* scm_t_guile_ticket; |
360 | ||
361 | static void | |
9de87eea | 362 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 363 | { |
9de87eea MV |
364 | scm_i_thread *t = (scm_i_thread *)ticket; |
365 | if (t) | |
366 | { | |
367 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
368 | resume (t); | |
369 | } | |
d823b11b MV |
370 | } |
371 | ||
9de87eea MV |
372 | static scm_i_thread * |
373 | suspend (void) | |
d823b11b | 374 | { |
9de87eea | 375 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
376 | |
377 | /* record top of stack for the GC */ | |
9de87eea | 378 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
379 | /* save registers. */ |
380 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
381 | setjmp (t->regs); |
382 | return t; | |
d823b11b MV |
383 | } |
384 | ||
98648121 | 385 | static scm_t_guile_ticket |
9de87eea | 386 | scm_leave_guile () |
d823b11b | 387 | { |
9de87eea MV |
388 | scm_i_thread *t = suspend (); |
389 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
390 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
391 | } |
392 | ||
9de87eea MV |
393 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
394 | static scm_i_thread *all_threads = NULL; | |
395 | static int thread_count; | |
396 | ||
397 | static SCM scm_i_default_dynamic_state; | |
398 | ||
399 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 400 | */ |
9de87eea MV |
401 | static void |
402 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 403 | { |
c812243b | 404 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
405 | |
406 | t->pthread = scm_i_pthread_self (); | |
407 | t->handle = SCM_BOOL_F; | |
408 | t->result = SCM_BOOL_F; | |
2e77f720 | 409 | t->cleanup_handler = SCM_BOOL_F; |
9de87eea MV |
410 | t->join_queue = SCM_EOL; |
411 | t->dynamic_state = SCM_BOOL_F; | |
412 | t->dynwinds = SCM_EOL; | |
413 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
414 | t->block_asyncs = 1; |
415 | t->pending_asyncs = 1; | |
416 | t->last_debug_frame = NULL; | |
417 | t->base = base; | |
0c97d7dd | 418 | t->continuation_root = SCM_EOL; |
9de87eea MV |
419 | t->continuation_base = base; |
420 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
421 | t->sleep_mutex = NULL; | |
422 | t->sleep_object = SCM_BOOL_F; | |
423 | t->sleep_fd = -1; | |
0c97d7dd | 424 | /* XXX - check for errors. */ |
9de87eea MV |
425 | pipe (t->sleep_pipe); |
426 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
427 | t->clear_freelists_p = 0; | |
1a8fdd7e | 428 | t->gc_running_p = 0; |
378f2625 LC |
429 | t->current_mark_stack_ptr = NULL; |
430 | t->current_mark_stack_limit = NULL; | |
2e77f720 | 431 | t->canceled = 0; |
9de87eea MV |
432 | t->exited = 0; |
433 | ||
434 | t->freelist = SCM_EOL; | |
435 | t->freelist2 = SCM_EOL; | |
436 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
437 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
438 | ||
439 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
440 | ||
441 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
442 | ||
443 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
444 | t->next_thread = all_threads; | |
445 | all_threads = t; | |
446 | thread_count++; | |
447 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
448 | } |
449 | ||
9de87eea | 450 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 451 | */ |
9de87eea MV |
452 | static void |
453 | guilify_self_2 (SCM parent) | |
d823b11b | 454 | { |
9de87eea MV |
455 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
456 | ||
457 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
c812243b | 458 | |
9de87eea MV |
459 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
460 | t->continuation_base = t->base; | |
461 | ||
462 | if (scm_is_true (parent)) | |
463 | t->dynamic_state = scm_make_dynamic_state (parent); | |
464 | else | |
465 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
466 | ||
467 | t->join_queue = make_queue (); | |
468 | t->block_asyncs = 0; | |
d823b11b MV |
469 | } |
470 | ||
9de87eea | 471 | /* Perform thread tear-down, in guile mode. |
d823b11b | 472 | */ |
9de87eea MV |
473 | static void * |
474 | do_thread_exit (void *v) | |
475 | { | |
2e77f720 LC |
476 | scm_i_thread *t = (scm_i_thread *) v; |
477 | ||
478 | if (!scm_is_false (t->cleanup_handler)) | |
479 | { | |
480 | SCM ptr = t->cleanup_handler; | |
481 | ||
482 | t->cleanup_handler = SCM_BOOL_F; | |
483 | t->result = scm_internal_catch (SCM_BOOL_T, | |
484 | (scm_t_catch_body) scm_call_0, ptr, | |
485 | scm_handle_by_message_noexit, NULL); | |
486 | } | |
9de87eea MV |
487 | |
488 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
489 | ||
490 | t->exited = 1; | |
0c97d7dd MV |
491 | close (t->sleep_pipe[0]); |
492 | close (t->sleep_pipe[1]); | |
9de87eea MV |
493 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
494 | ; | |
9de87eea MV |
495 | |
496 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
2e77f720 | 497 | |
9de87eea MV |
498 | return NULL; |
499 | } | |
500 | ||
d823b11b | 501 | static void |
9de87eea | 502 | on_thread_exit (void *v) |
d823b11b | 503 | { |
29776e85 | 504 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 505 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 506 | |
9de87eea | 507 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 508 | |
2e77f720 LC |
509 | /* Ensure the signal handling thread has been launched, because we might be |
510 | shutting it down. */ | |
511 | scm_i_ensure_signal_delivery_thread (); | |
512 | ||
0c97d7dd | 513 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 514 | since the queue is a SCM data structure. */ |
9de87eea | 515 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
516 | |
517 | /* Removing ourself from the list of all threads needs to happen in | |
518 | non-guile mode since all SCM values on our stack become | |
29776e85 | 519 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
520 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
521 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
522 | if (*tp == t) | |
523 | { | |
524 | *tp = t->next_thread; | |
525 | break; | |
526 | } | |
527 | thread_count--; | |
2e77f720 LC |
528 | |
529 | /* If there's only one other thread, it could be the signal delivery | |
530 | thread, so we need to notify it to shut down by closing its read pipe. | |
531 | If it's not the signal delivery thread, then closing the read pipe isn't | |
532 | going to hurt. */ | |
533 | if (thread_count <= 1) | |
534 | scm_i_close_signal_pipe (); | |
535 | ||
0c97d7dd MV |
536 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
537 | ||
9de87eea | 538 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
539 | } |
540 | ||
9de87eea | 541 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 542 | |
9de87eea MV |
543 | static void |
544 | init_thread_key (void) | |
545 | { | |
546 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
547 | } | |
d823b11b | 548 | |
9de87eea MV |
549 | /* Perform any initializations necessary to bring the current thread |
550 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 551 | |
9de87eea MV |
552 | BASE is the stack base to use with GC. |
553 | ||
554 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
555 | which case the default dynamic state is used. | |
556 | ||
557 | Return zero when the thread was in guile mode already; otherwise | |
558 | return 1. | |
559 | */ | |
560 | ||
561 | static int | |
562 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 563 | { |
9de87eea MV |
564 | scm_i_thread *t; |
565 | ||
566 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
567 | ||
568 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
569 | { | |
570 | /* This thread has not been guilified yet. | |
571 | */ | |
572 | ||
573 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
574 | if (scm_initialized_p == 0) | |
575 | { | |
576 | /* First thread ever to enter Guile. Run the full | |
577 | initialization. | |
578 | */ | |
579 | scm_i_init_guile (base); | |
580 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
581 | } | |
582 | else | |
583 | { | |
584 | /* Guile is already initialized, but this thread enters it for | |
585 | the first time. Only initialize this thread. | |
586 | */ | |
587 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
588 | guilify_self_1 (base); | |
589 | guilify_self_2 (parent); | |
590 | } | |
591 | return 1; | |
592 | } | |
593 | else if (t->top) | |
594 | { | |
595 | /* This thread is already guilified but not in guile mode, just | |
596 | resume it. | |
597 | ||
598 | XXX - base might be lower than when this thread was first | |
599 | guilified. | |
600 | */ | |
601 | scm_enter_guile ((scm_t_guile_ticket) t); | |
602 | return 1; | |
603 | } | |
604 | else | |
605 | { | |
606 | /* Thread is already in guile mode. Nothing to do. | |
607 | */ | |
608 | return 0; | |
609 | } | |
d823b11b MV |
610 | } |
611 | ||
9de87eea | 612 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 613 | |
23d72566 KR |
614 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
615 | /* This method for GNU/Linux and perhaps some other systems. | |
616 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
617 | available on them. */ | |
9de87eea MV |
618 | #define HAVE_GET_THREAD_STACK_BASE |
619 | ||
620 | static SCM_STACKITEM * | |
621 | get_thread_stack_base () | |
d823b11b | 622 | { |
9de87eea MV |
623 | pthread_attr_t attr; |
624 | void *start, *end; | |
625 | size_t size; | |
626 | ||
9de87eea MV |
627 | pthread_getattr_np (pthread_self (), &attr); |
628 | pthread_attr_getstack (&attr, &start, &size); | |
629 | end = (char *)start + size; | |
630 | ||
2b829bbb KR |
631 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
632 | for the main thread, but we can use scm_get_stack_base in that | |
633 | case. | |
634 | */ | |
635 | ||
636 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 637 | if ((void *)&attr < start || (void *)&attr >= end) |
071e0d93 | 638 | return (SCM_STACKITEM *) GC_stackbottom; |
9de87eea | 639 | else |
2b829bbb | 640 | #endif |
9de87eea MV |
641 | { |
642 | #if SCM_STACK_GROWS_UP | |
643 | return start; | |
644 | #else | |
645 | return end; | |
646 | #endif | |
647 | } | |
a54a94b3 MV |
648 | } |
649 | ||
23d72566 KR |
650 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
651 | /* This method for MacOS X. | |
652 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
653 | but as of 2006 there's nothing obvious at apple.com. */ | |
654 | #define HAVE_GET_THREAD_STACK_BASE | |
655 | static SCM_STACKITEM * | |
656 | get_thread_stack_base () | |
657 | { | |
658 | return pthread_get_stackaddr_np (pthread_self ()); | |
659 | } | |
660 | ||
661 | #elif defined (__MINGW32__) | |
662 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
663 | in any thread. We don't like hard-coding the name of a system, but there | |
664 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
665 | work. */ | |
666 | #define HAVE_GET_THREAD_STACK_BASE | |
667 | static SCM_STACKITEM * | |
668 | get_thread_stack_base () | |
669 | { | |
071e0d93 | 670 | return (SCM_STACKITEM *) GC_stackbottom; |
23d72566 KR |
671 | } |
672 | ||
673 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
674 | |
675 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
676 | ||
677 | #define HAVE_GET_THREAD_STACK_BASE | |
678 | ||
679 | static SCM_STACKITEM * | |
680 | get_thread_stack_base () | |
a54a94b3 | 681 | { |
071e0d93 | 682 | return (SCM_STACKITEM *) GC_stackbottom; |
d823b11b MV |
683 | } |
684 | ||
9de87eea | 685 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
686 | |
687 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
688 | ||
689 | void | |
690 | scm_init_guile () | |
d823b11b | 691 | { |
9de87eea MV |
692 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
693 | scm_i_default_dynamic_state); | |
d823b11b MV |
694 | } |
695 | ||
9de87eea MV |
696 | #endif |
697 | ||
698 | void * | |
699 | scm_with_guile (void *(*func)(void *), void *data) | |
700 | { | |
701 | return scm_i_with_guile_and_parent (func, data, | |
702 | scm_i_default_dynamic_state); | |
703 | } | |
704 | ||
2e77f720 LC |
705 | static void |
706 | scm_leave_guile_cleanup (void *x) | |
707 | { | |
708 | scm_leave_guile (); | |
709 | } | |
710 | ||
9de87eea | 711 | void * |
2e77f720 | 712 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
713 | { |
714 | void *res; | |
715 | int really_entered; | |
716 | SCM_STACKITEM base_item; | |
2e77f720 | 717 | |
9de87eea | 718 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 719 | if (really_entered) |
2e77f720 LC |
720 | { |
721 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
722 | res = scm_c_with_continuation_barrier (func, data); | |
723 | scm_i_pthread_cleanup_pop (0); | |
724 | scm_leave_guile (); | |
725 | } | |
726 | else | |
727 | res = scm_c_with_continuation_barrier (func, data); | |
728 | ||
9de87eea MV |
729 | return res; |
730 | } | |
731 | ||
732 | void * | |
733 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 734 | { |
9de87eea MV |
735 | void *res; |
736 | scm_t_guile_ticket t; | |
737 | t = scm_leave_guile (); | |
738 | res = func (data); | |
739 | scm_enter_guile (t); | |
740 | return res; | |
741 | } | |
742 | ||
743 | /*** Thread creation */ | |
744 | ||
745 | typedef struct { | |
746 | SCM parent; | |
747 | SCM thunk; | |
748 | SCM handler; | |
76da80e7 | 749 | SCM thread; |
9de87eea MV |
750 | scm_i_pthread_mutex_t mutex; |
751 | scm_i_pthread_cond_t cond; | |
752 | } launch_data; | |
d823b11b | 753 | |
9de87eea MV |
754 | static void * |
755 | really_launch (void *d) | |
756 | { | |
757 | launch_data *data = (launch_data *)d; | |
758 | SCM thunk = data->thunk, handler = data->handler; | |
759 | scm_i_thread *t; | |
d823b11b | 760 | |
9de87eea | 761 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 762 | |
9de87eea MV |
763 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
764 | data->thread = scm_current_thread (); | |
765 | scm_i_pthread_cond_signal (&data->cond); | |
766 | scm_i_pthread_mutex_unlock (&data->mutex); | |
767 | ||
768 | if (SCM_UNBNDP (handler)) | |
769 | t->result = scm_call_0 (thunk); | |
770 | else | |
771 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
772 | ||
773 | return 0; | |
d823b11b MV |
774 | } |
775 | ||
9de87eea MV |
776 | static void * |
777 | launch_thread (void *d) | |
778 | { | |
779 | launch_data *data = (launch_data *)d; | |
780 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
781 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
782 | return NULL; | |
783 | } | |
784 | ||
785 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 786 | (SCM thunk, SCM handler), |
9de87eea MV |
787 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
788 | "returning a new thread object representing the thread. The procedure\n" | |
789 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
790 | "\n" | |
791 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
792 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
793 | "handler. This catch is established inside the continuation barrier.\n" | |
794 | "\n" | |
795 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
796 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
797 | #define FUNC_NAME s_scm_call_with_new_thread |
798 | { | |
9de87eea MV |
799 | launch_data data; |
800 | scm_i_pthread_t id; | |
801 | int err; | |
d823b11b | 802 | |
9de87eea MV |
803 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
804 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
805 | handler, SCM_ARG2, FUNC_NAME); | |
806 | ||
807 | data.parent = scm_current_dynamic_state (); | |
808 | data.thunk = thunk; | |
809 | data.handler = handler; | |
810 | data.thread = SCM_BOOL_F; | |
811 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
812 | scm_i_pthread_cond_init (&data.cond, NULL); | |
813 | ||
814 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
815 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
816 | if (err) | |
817 | { | |
818 | scm_i_pthread_mutex_unlock (&data.mutex); | |
819 | errno = err; | |
820 | scm_syserror (NULL); | |
821 | } | |
822 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
823 | scm_i_pthread_mutex_unlock (&data.mutex); | |
824 | ||
825 | return data.thread; | |
d823b11b MV |
826 | } |
827 | #undef FUNC_NAME | |
828 | ||
9de87eea MV |
829 | typedef struct { |
830 | SCM parent; | |
831 | scm_t_catch_body body; | |
832 | void *body_data; | |
833 | scm_t_catch_handler handler; | |
834 | void *handler_data; | |
835 | SCM thread; | |
836 | scm_i_pthread_mutex_t mutex; | |
837 | scm_i_pthread_cond_t cond; | |
838 | } spawn_data; | |
839 | ||
840 | static void * | |
841 | really_spawn (void *d) | |
842 | { | |
843 | spawn_data *data = (spawn_data *)d; | |
844 | scm_t_catch_body body = data->body; | |
845 | void *body_data = data->body_data; | |
846 | scm_t_catch_handler handler = data->handler; | |
847 | void *handler_data = data->handler_data; | |
848 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
849 | ||
850 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
851 | data->thread = scm_current_thread (); | |
852 | scm_i_pthread_cond_signal (&data->cond); | |
853 | scm_i_pthread_mutex_unlock (&data->mutex); | |
854 | ||
855 | if (handler == NULL) | |
856 | t->result = body (body_data); | |
857 | else | |
858 | t->result = scm_internal_catch (SCM_BOOL_T, | |
859 | body, body_data, | |
860 | handler, handler_data); | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | static void * | |
866 | spawn_thread (void *d) | |
867 | { | |
868 | spawn_data *data = (spawn_data *)d; | |
869 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
870 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
871 | return NULL; | |
872 | } | |
873 | ||
874 | SCM | |
875 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
876 | scm_t_catch_handler handler, void *handler_data) | |
877 | { | |
878 | spawn_data data; | |
879 | scm_i_pthread_t id; | |
880 | int err; | |
881 | ||
882 | data.parent = scm_current_dynamic_state (); | |
883 | data.body = body; | |
884 | data.body_data = body_data; | |
885 | data.handler = handler; | |
886 | data.handler_data = handler_data; | |
887 | data.thread = SCM_BOOL_F; | |
888 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
889 | scm_i_pthread_cond_init (&data.cond, NULL); | |
890 | ||
891 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
892 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
893 | if (err) | |
894 | { | |
895 | scm_i_pthread_mutex_unlock (&data.mutex); | |
896 | errno = err; | |
897 | scm_syserror (NULL); | |
898 | } | |
899 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
900 | scm_i_pthread_mutex_unlock (&data.mutex); | |
901 | ||
902 | return data.thread; | |
903 | } | |
904 | ||
29717c89 MD |
905 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
906 | (), | |
907 | "Move the calling thread to the end of the scheduling queue.") | |
908 | #define FUNC_NAME s_scm_yield | |
909 | { | |
9de87eea | 910 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
911 | } |
912 | #undef FUNC_NAME | |
913 | ||
2e77f720 LC |
914 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
915 | (SCM thread), | |
916 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
917 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
918 | "been signaled to terminate, this function is a no-op.") | |
919 | #define FUNC_NAME s_scm_cancel_thread | |
920 | { | |
921 | scm_i_thread *t = NULL; | |
922 | ||
923 | SCM_VALIDATE_THREAD (1, thread); | |
924 | t = SCM_I_THREAD_DATA (thread); | |
925 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
926 | if (!t->canceled) | |
927 | { | |
928 | t->canceled = 1; | |
929 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
930 | scm_i_pthread_cancel (t->pthread); | |
931 | } | |
932 | else | |
933 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
934 | ||
935 | return SCM_UNSPECIFIED; | |
936 | } | |
937 | #undef FUNC_NAME | |
938 | ||
939 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
940 | (SCM thread, SCM proc), | |
941 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
942 | "This handler will be called when the thread exits.") | |
943 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
944 | { | |
945 | scm_i_thread *t; | |
946 | ||
947 | SCM_VALIDATE_THREAD (1, thread); | |
948 | if (!scm_is_false (proc)) | |
949 | SCM_VALIDATE_THUNK (2, proc); | |
950 | ||
951 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
952 | ||
953 | t = SCM_I_THREAD_DATA (thread); | |
954 | if (!(t->exited || t->canceled)) | |
955 | t->cleanup_handler = proc; | |
956 | ||
957 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
958 | ||
959 | return SCM_UNSPECIFIED; | |
960 | } | |
961 | #undef FUNC_NAME | |
962 | ||
963 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
964 | (SCM thread), | |
965 | "Return the cleanup handler installed for the thread @var{thread}.") | |
966 | #define FUNC_NAME s_scm_thread_cleanup | |
967 | { | |
968 | scm_i_thread *t; | |
969 | SCM ret; | |
970 | ||
971 | SCM_VALIDATE_THREAD (1, thread); | |
972 | ||
973 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
974 | t = SCM_I_THREAD_DATA (thread); | |
975 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; | |
976 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
977 | ||
978 | return ret; | |
979 | } | |
980 | #undef FUNC_NAME | |
981 | ||
d823b11b | 982 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 983 | (SCM thread), |
d823b11b MV |
984 | "Suspend execution of the calling thread until the target @var{thread} " |
985 | "terminates, unless the target @var{thread} has already terminated. ") | |
986 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 987 | { |
9de87eea | 988 | scm_i_thread *t; |
d823b11b MV |
989 | SCM res; |
990 | ||
991 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 992 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 993 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 994 | |
9de87eea MV |
995 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); |
996 | ||
997 | t = SCM_I_THREAD_DATA (thread); | |
d823b11b MV |
998 | if (!t->exited) |
999 | { | |
9de87eea MV |
1000 | while (1) |
1001 | { | |
1002 | block_self (t->join_queue, thread, &thread_admin_mutex, NULL); | |
1003 | if (t->exited) | |
1004 | break; | |
1005 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1006 | SCM_TICK; | |
1007 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
1008 | } | |
d823b11b MV |
1009 | } |
1010 | res = t->result; | |
9de87eea MV |
1011 | |
1012 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
2e77f720 | 1013 | |
d823b11b | 1014 | return res; |
5f05c406 MV |
1015 | } |
1016 | #undef FUNC_NAME | |
1017 | ||
2e77f720 LC |
1018 | |
1019 | \f | |
9de87eea | 1020 | /*** Fat mutexes */ |
4079f87e | 1021 | |
d823b11b MV |
1022 | /* We implement our own mutex type since we want them to be 'fair', we |
1023 | want to do fancy things while waiting for them (like running | |
9de87eea MV |
1024 | asyncs) and we might want to add things that are nice for |
1025 | debugging. | |
d823b11b | 1026 | */ |
4079f87e | 1027 | |
9de87eea MV |
1028 | typedef struct { |
1029 | scm_i_pthread_mutex_t lock; | |
d823b11b | 1030 | SCM owner; |
9de87eea MV |
1031 | int level; /* how much the owner owns us. |
1032 | < 0 for non-recursive mutexes */ | |
1033 | SCM waiting; /* the threads waiting for this mutex. */ | |
1034 | } fat_mutex; | |
1035 | ||
1036 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
1037 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
5f05c406 | 1038 | |
4079f87e | 1039 | |
9de87eea MV |
1040 | static size_t |
1041 | fat_mutex_free (SCM mx) | |
76da80e7 | 1042 | { |
9de87eea MV |
1043 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1044 | scm_i_pthread_mutex_destroy (&m->lock); | |
1045 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1046 | return 0; |
1047 | } | |
1048 | ||
1049 | static int | |
9de87eea | 1050 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1051 | { |
9de87eea MV |
1052 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1053 | scm_puts ("#<mutex ", port); | |
1054 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1055 | scm_puts (">", port); | |
1056 | return 1; | |
76da80e7 MV |
1057 | } |
1058 | ||
76da80e7 | 1059 | static SCM |
9de87eea | 1060 | make_fat_mutex (int recursive) |
76da80e7 | 1061 | { |
9de87eea MV |
1062 | fat_mutex *m; |
1063 | SCM mx; | |
1064 | ||
1065 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1066 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1067 | m->owner = SCM_BOOL_F; | |
1068 | m->level = recursive? 0 : -1; | |
1069 | m->waiting = SCM_EOL; | |
1070 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1071 | m->waiting = make_queue (); | |
1072 | return mx; | |
76da80e7 MV |
1073 | } |
1074 | ||
9de87eea | 1075 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, |
76da80e7 | 1076 | (void), |
9de87eea MV |
1077 | "Create a new mutex. ") |
1078 | #define FUNC_NAME s_scm_make_mutex | |
76da80e7 | 1079 | { |
9de87eea | 1080 | return make_fat_mutex (0); |
76da80e7 MV |
1081 | } |
1082 | #undef FUNC_NAME | |
1083 | ||
9de87eea | 1084 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1085 | (void), |
9de87eea MV |
1086 | "Create a new recursive mutex. ") |
1087 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1088 | { |
9de87eea | 1089 | return make_fat_mutex (1); |
9bc4701c MD |
1090 | } |
1091 | #undef FUNC_NAME | |
1092 | ||
9de87eea MV |
1093 | static char * |
1094 | fat_mutex_lock (SCM mutex) | |
1095 | { | |
1096 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1097 | SCM thread = scm_current_thread (); | |
1098 | char *msg = NULL; | |
1099 | ||
1100 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1101 | if (scm_is_false (m->owner)) | |
1102 | m->owner = thread; | |
1103 | else if (scm_is_eq (m->owner, thread)) | |
1104 | { | |
1105 | if (m->level >= 0) | |
1106 | m->level++; | |
1107 | else | |
1108 | msg = "mutex already locked by current thread"; | |
1109 | } | |
1110 | else | |
1111 | { | |
1112 | while (1) | |
1113 | { | |
1114 | block_self (m->waiting, mutex, &m->lock, NULL); | |
1115 | if (scm_is_eq (m->owner, thread)) | |
1116 | break; | |
1117 | scm_i_pthread_mutex_unlock (&m->lock); | |
1118 | SCM_TICK; | |
1119 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1120 | } | |
1121 | } | |
1122 | scm_i_pthread_mutex_unlock (&m->lock); | |
1123 | return msg; | |
1124 | } | |
1125 | ||
9bc4701c MD |
1126 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, |
1127 | (SCM mx), | |
1128 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
1129 | "blocks until the mutex becomes available. The function returns when " | |
1130 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1131 | "a thread already owns will succeed right away and will not block the " | |
1132 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
1133 | #define FUNC_NAME s_scm_lock_mutex | |
1134 | { | |
9de87eea | 1135 | char *msg; |
76da80e7 | 1136 | |
b01532af | 1137 | SCM_VALIDATE_MUTEX (1, mx); |
9de87eea MV |
1138 | msg = fat_mutex_lock (mx); |
1139 | if (msg) | |
1140 | scm_misc_error (NULL, msg, SCM_EOL); | |
76da80e7 | 1141 | return SCM_BOOL_T; |
9bc4701c | 1142 | } |
76da80e7 | 1143 | #undef FUNC_NAME |
9bc4701c | 1144 | |
a4d106c7 | 1145 | void |
661ae7ab | 1146 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1147 | { |
661ae7ab MV |
1148 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1149 | SCM_F_WIND_EXPLICITLY); | |
1150 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1151 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1152 | } |
1153 | ||
9de87eea MV |
1154 | static char * |
1155 | fat_mutex_trylock (fat_mutex *m, int *resp) | |
1156 | { | |
1157 | char *msg = NULL; | |
1158 | SCM thread = scm_current_thread (); | |
1159 | ||
1160 | *resp = 1; | |
1161 | scm_i_pthread_mutex_lock (&m->lock); | |
1162 | if (scm_is_false (m->owner)) | |
1163 | m->owner = thread; | |
1164 | else if (scm_is_eq (m->owner, thread)) | |
1165 | { | |
1166 | if (m->level >= 0) | |
1167 | m->level++; | |
1168 | else | |
1169 | msg = "mutex already locked by current thread"; | |
1170 | } | |
1171 | else | |
1172 | *resp = 0; | |
1173 | scm_i_pthread_mutex_unlock (&m->lock); | |
1174 | return msg; | |
1175 | } | |
1176 | ||
9bc4701c | 1177 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1178 | (SCM mutex), |
9bc4701c MD |
1179 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1180 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1181 | #define FUNC_NAME s_scm_try_mutex | |
1182 | { | |
9de87eea MV |
1183 | char *msg; |
1184 | int res; | |
1185 | ||
ba1b7223 | 1186 | SCM_VALIDATE_MUTEX (1, mutex); |
9bc4701c | 1187 | |
ba1b7223 | 1188 | msg = fat_mutex_trylock (SCM_MUTEX_DATA (mutex), &res); |
9de87eea MV |
1189 | if (msg) |
1190 | scm_misc_error (NULL, msg, SCM_EOL); | |
1191 | return scm_from_bool (res); | |
1192 | } | |
1193 | #undef FUNC_NAME | |
76da80e7 | 1194 | |
9de87eea MV |
1195 | static char * |
1196 | fat_mutex_unlock (fat_mutex *m) | |
1197 | { | |
1198 | char *msg = NULL; | |
1199 | ||
1200 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1201 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1202 | { |
9de87eea MV |
1203 | if (scm_is_false (m->owner)) |
1204 | msg = "mutex not locked"; | |
1205 | else | |
1206 | msg = "mutex not locked by current thread"; | |
9bc4701c | 1207 | } |
9de87eea MV |
1208 | else if (m->level > 0) |
1209 | m->level--; | |
1210 | else | |
1211 | m->owner = unblock_from_queue (m->waiting); | |
1212 | scm_i_pthread_mutex_unlock (&m->lock); | |
1213 | ||
1214 | return msg; | |
9bc4701c | 1215 | } |
9bc4701c MD |
1216 | |
1217 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
1218 | (SCM mx), | |
1219 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
1220 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1221 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1222 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1223 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1224 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1225 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
1226 | #define FUNC_NAME s_scm_unlock_mutex | |
1227 | { | |
9de87eea | 1228 | char *msg; |
9bc4701c MD |
1229 | SCM_VALIDATE_MUTEX (1, mx); |
1230 | ||
9de87eea MV |
1231 | msg = fat_mutex_unlock (SCM_MUTEX_DATA (mx)); |
1232 | if (msg) | |
1233 | scm_misc_error (NULL, msg, SCM_EOL); | |
9bc4701c MD |
1234 | return SCM_BOOL_T; |
1235 | } | |
1236 | #undef FUNC_NAME | |
1237 | ||
9de87eea MV |
1238 | #if 0 |
1239 | ||
1240 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1241 | (SCM mx), | |
1242 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1243 | #define FUNC_NAME s_scm_mutex_owner | |
1244 | { | |
1245 | SCM_VALIDATE_MUTEX (1, mx); | |
1246 | return (SCM_MUTEX_DATA(mx))->owner; | |
1247 | } | |
1248 | #undef FUNC_NAME | |
1249 | ||
1250 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1251 | (SCM mx), | |
1252 | "Return the lock level of a recursive mutex, or -1\n" | |
1253 | "for a standard mutex.") | |
1254 | #define FUNC_NAME s_scm_mutex_level | |
1255 | { | |
1256 | SCM_VALIDATE_MUTEX (1, mx); | |
1257 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1258 | } | |
1259 | #undef FUNC_NAME | |
1260 | ||
1261 | #endif | |
1262 | ||
1263 | /*** Fat condition variables */ | |
1264 | ||
1265 | typedef struct { | |
1266 | scm_i_pthread_mutex_t lock; | |
1267 | SCM waiting; /* the threads waiting for this condition. */ | |
1268 | } fat_cond; | |
1269 | ||
1270 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1271 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1272 | ||
9de87eea MV |
1273 | static size_t |
1274 | fat_cond_free (SCM mx) | |
1275 | { | |
1276 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1277 | scm_i_pthread_mutex_destroy (&c->lock); | |
1278 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static int | |
1283 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1284 | { | |
1285 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1286 | scm_puts ("#<condition-variable ", port); | |
1287 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1288 | scm_puts (">", port); | |
1289 | return 1; | |
1290 | } | |
9bc4701c | 1291 | |
d823b11b MV |
1292 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1293 | (void), | |
1294 | "Make a new condition variable.") | |
1295 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1296 | { |
9de87eea MV |
1297 | fat_cond *c; |
1298 | SCM cv; | |
1299 | ||
1300 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1301 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1302 | c->waiting = SCM_EOL; | |
1303 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1304 | c->waiting = make_queue (); | |
d823b11b | 1305 | return cv; |
5f05c406 | 1306 | } |
d823b11b | 1307 | #undef FUNC_NAME |
5f05c406 | 1308 | |
9de87eea MV |
1309 | static int |
1310 | fat_cond_timedwait (SCM cond, SCM mutex, | |
1311 | const scm_t_timespec *waittime) | |
1312 | { | |
1313 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1314 | fat_cond *c = SCM_CONDVAR_DATA (cond); | |
1315 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1316 | const char *msg; | |
1317 | int err = 0; | |
1318 | ||
1319 | while (1) | |
1320 | { | |
9de87eea MV |
1321 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1322 | msg = fat_mutex_unlock (m); | |
1323 | t->block_asyncs++; | |
1324 | if (msg == NULL) | |
1325 | { | |
1326 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1327 | scm_i_pthread_mutex_unlock (&c->lock); | |
9de87eea MV |
1328 | fat_mutex_lock (mutex); |
1329 | } | |
1330 | else | |
1331 | scm_i_pthread_mutex_unlock (&c->lock); | |
1332 | t->block_asyncs--; | |
1333 | scm_async_click (); | |
1334 | ||
9de87eea MV |
1335 | if (msg) |
1336 | scm_misc_error (NULL, msg, SCM_EOL); | |
1337 | ||
1338 | scm_remember_upto_here_2 (cond, mutex); | |
1339 | ||
1340 | if (err == 0) | |
1341 | return 1; | |
1342 | if (err == ETIMEDOUT) | |
1343 | return 0; | |
1344 | if (err != EINTR) | |
1345 | { | |
1346 | errno = err; | |
1347 | scm_syserror (NULL); | |
1348 | } | |
1349 | } | |
1350 | } | |
1351 | ||
d823b11b MV |
1352 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1353 | (SCM cv, SCM mx, SCM t), | |
1354 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1355 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1356 | "is locked again when this function returns. When @var{time} is given, " | |
1357 | "it specifies a point in time where the waiting should be aborted. It " | |
1358 | "can be either a integer as returned by @code{current-time} or a pair " | |
1359 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1360 | "mutex is locked and @code{#f} is returned. When the condition " | |
1361 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1362 | "is returned. ") | |
1363 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1364 | { |
9de87eea | 1365 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1366 | |
1367 | SCM_VALIDATE_CONDVAR (1, cv); | |
1368 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1369 | |
d823b11b MV |
1370 | if (!SCM_UNBNDP (t)) |
1371 | { | |
d2e53ed6 | 1372 | if (scm_is_pair (t)) |
d823b11b | 1373 | { |
9de87eea MV |
1374 | waittime.tv_sec = scm_to_ulong (SCM_CAR (t)); |
1375 | waittime.tv_nsec = scm_to_ulong (SCM_CAR (t)) * 1000; | |
d823b11b MV |
1376 | } |
1377 | else | |
1378 | { | |
9de87eea | 1379 | waittime.tv_sec = scm_to_ulong (t); |
d823b11b MV |
1380 | waittime.tv_nsec = 0; |
1381 | } | |
9de87eea | 1382 | waitptr = &waittime; |
d823b11b MV |
1383 | } |
1384 | ||
9de87eea | 1385 | return scm_from_bool (fat_cond_timedwait (cv, mx, waitptr)); |
5f05c406 | 1386 | } |
d823b11b | 1387 | #undef FUNC_NAME |
5f05c406 | 1388 | |
9de87eea MV |
1389 | static void |
1390 | fat_cond_signal (fat_cond *c) | |
1391 | { | |
9de87eea MV |
1392 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1393 | unblock_from_queue (c->waiting); | |
1394 | scm_i_pthread_mutex_unlock (&c->lock); | |
1395 | } | |
1396 | ||
d823b11b MV |
1397 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1398 | (SCM cv), | |
1399 | "Wake up one thread that is waiting for @var{cv}") | |
1400 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1401 | { |
d823b11b | 1402 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1403 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1404 | return SCM_BOOL_T; |
5f05c406 | 1405 | } |
d823b11b | 1406 | #undef FUNC_NAME |
5f05c406 | 1407 | |
9de87eea MV |
1408 | static void |
1409 | fat_cond_broadcast (fat_cond *c) | |
1410 | { | |
1411 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1412 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1413 | ; | |
1414 | scm_i_pthread_mutex_unlock (&c->lock); | |
1415 | } | |
1416 | ||
d823b11b MV |
1417 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1418 | (SCM cv), | |
1419 | "Wake up all threads that are waiting for @var{cv}. ") | |
1420 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1421 | { |
d823b11b | 1422 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1423 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1424 | return SCM_BOOL_T; |
5f05c406 | 1425 | } |
d823b11b | 1426 | #undef FUNC_NAME |
5f05c406 | 1427 | |
d823b11b MV |
1428 | /*** Marking stacks */ |
1429 | ||
1430 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1431 | threads as well? | |
1432 | */ | |
1433 | #ifdef __ia64__ | |
1434 | # define SCM_MARK_BACKING_STORE() do { \ | |
1435 | ucontext_t ctx; \ | |
1436 | SCM_STACKITEM * top, * bot; \ | |
1437 | getcontext (&ctx); \ | |
1438 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1439 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1440 | / sizeof (SCM_STACKITEM))); \ | |
9a5fa6e9 NJ |
1441 | bot = (SCM_STACKITEM *) scm_ia64_register_backing_store_base (); \ |
1442 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ | |
d823b11b MV |
1443 | scm_mark_locations (bot, top - bot); } while (0) |
1444 | #else | |
1445 | # define SCM_MARK_BACKING_STORE() | |
1446 | #endif | |
1447 | ||
6087fad9 | 1448 | |
5f05c406 | 1449 | |
d823b11b MV |
1450 | /*** Select */ |
1451 | ||
911782b7 | 1452 | int |
9de87eea MV |
1453 | scm_std_select (int nfds, |
1454 | SELECT_TYPE *readfds, | |
1455 | SELECT_TYPE *writefds, | |
1456 | SELECT_TYPE *exceptfds, | |
1457 | struct timeval *timeout) | |
1458 | { | |
1459 | fd_set my_readfds; | |
1460 | int res, eno, wakeup_fd; | |
1461 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1462 | scm_t_guile_ticket ticket; | |
1463 | ||
1464 | if (readfds == NULL) | |
1465 | { | |
1466 | FD_ZERO (&my_readfds); | |
1467 | readfds = &my_readfds; | |
1468 | } | |
1469 | ||
1470 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1471 | SCM_TICK; | |
1472 | ||
1473 | wakeup_fd = t->sleep_pipe[0]; | |
1474 | ticket = scm_leave_guile (); | |
1475 | FD_SET (wakeup_fd, readfds); | |
1476 | if (wakeup_fd >= nfds) | |
1477 | nfds = wakeup_fd+1; | |
1478 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1479 | t->sleep_fd = -1; | |
d823b11b | 1480 | eno = errno; |
9de87eea MV |
1481 | scm_enter_guile (ticket); |
1482 | ||
1483 | scm_i_reset_sleep (t); | |
1484 | ||
1485 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1486 | { | |
1487 | char dummy; | |
1488 | read (wakeup_fd, &dummy, 1); | |
1489 | FD_CLR (wakeup_fd, readfds); | |
1490 | res -= 1; | |
1491 | if (res == 0) | |
1492 | { | |
1493 | eno = EINTR; | |
1494 | res = -1; | |
1495 | } | |
1496 | } | |
d823b11b MV |
1497 | errno = eno; |
1498 | return res; | |
5f05c406 MV |
1499 | } |
1500 | ||
9de87eea | 1501 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1502 | |
9de87eea | 1503 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1504 | |
9bc4701c | 1505 | int |
9de87eea | 1506 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1507 | { |
9de87eea MV |
1508 | scm_t_guile_ticket t = scm_leave_guile (); |
1509 | int res = scm_i_pthread_mutex_lock (mutex); | |
1510 | scm_enter_guile (t); | |
9bc4701c MD |
1511 | return res; |
1512 | } | |
1513 | ||
9de87eea | 1514 | static void |
2b829bbb | 1515 | do_unlock (void *data) |
28d52ebb | 1516 | { |
9de87eea | 1517 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1518 | } |
1519 | ||
1520 | void | |
661ae7ab | 1521 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1522 | { |
9de87eea | 1523 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1524 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1525 | } |
1526 | ||
9bc4701c | 1527 | int |
9de87eea | 1528 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1529 | { |
9de87eea MV |
1530 | scm_t_guile_ticket t = scm_leave_guile (); |
1531 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1532 | scm_enter_guile (t); | |
9bc4701c MD |
1533 | return res; |
1534 | } | |
9bc4701c | 1535 | |
76da80e7 | 1536 | int |
9de87eea MV |
1537 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1538 | scm_i_pthread_mutex_t *mutex, | |
1539 | const scm_t_timespec *wt) | |
76da80e7 | 1540 | { |
9de87eea MV |
1541 | scm_t_guile_ticket t = scm_leave_guile (); |
1542 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1543 | scm_enter_guile (t); | |
1544 | return res; | |
76da80e7 MV |
1545 | } |
1546 | ||
9de87eea | 1547 | #endif |
76da80e7 | 1548 | |
d823b11b | 1549 | unsigned long |
9de87eea | 1550 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1551 | { |
d823b11b MV |
1552 | struct timeval tv; |
1553 | tv.tv_usec = usecs % 1000000; | |
1554 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1555 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1556 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1557 | } |
1558 | ||
9de87eea MV |
1559 | unsigned int |
1560 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1561 | { |
d823b11b MV |
1562 | struct timeval tv; |
1563 | tv.tv_usec = 0; | |
1564 | tv.tv_sec = secs; | |
9de87eea | 1565 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1566 | return tv.tv_sec; |
6c214b62 MD |
1567 | } |
1568 | ||
d823b11b MV |
1569 | /*** Misc */ |
1570 | ||
1571 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1572 | (void), | |
1573 | "Return the thread that called this function.") | |
1574 | #define FUNC_NAME s_scm_current_thread | |
1575 | { | |
9de87eea | 1576 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1577 | } |
1578 | #undef FUNC_NAME | |
1579 | ||
9de87eea MV |
1580 | static SCM |
1581 | scm_c_make_list (size_t n, SCM fill) | |
1582 | { | |
1583 | SCM res = SCM_EOL; | |
1584 | while (n-- > 0) | |
1585 | res = scm_cons (fill, res); | |
1586 | return res; | |
1587 | } | |
1588 | ||
d823b11b MV |
1589 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1590 | (void), | |
1591 | "Return a list of all threads.") | |
9bc4701c | 1592 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1593 | { |
9de87eea MV |
1594 | /* We can not allocate while holding the thread_admin_mutex because |
1595 | of the way GC is done. | |
1596 | */ | |
1597 | int n = thread_count; | |
1598 | scm_i_thread *t; | |
1599 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1600 | |
9de87eea MV |
1601 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1602 | l = &list; | |
1603 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1604 | { | |
2e77f720 LC |
1605 | if (t != scm_i_signal_delivery_thread) |
1606 | { | |
1607 | SCM_SETCAR (*l, t->handle); | |
1608 | l = SCM_CDRLOC (*l); | |
1609 | } | |
9de87eea MV |
1610 | n--; |
1611 | } | |
1612 | *l = SCM_EOL; | |
1613 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1614 | return list; | |
d823b11b | 1615 | } |
9de87eea | 1616 | #undef FUNC_NAME |
d823b11b MV |
1617 | |
1618 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1619 | (SCM thread), | |
1620 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1621 | #define FUNC_NAME s_scm_thread_exited_p | |
1622 | { | |
7888309b | 1623 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1624 | } |
1625 | #undef FUNC_NAME | |
1626 | ||
911782b7 | 1627 | int |
d823b11b MV |
1628 | scm_c_thread_exited_p (SCM thread) |
1629 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1630 | { |
9de87eea | 1631 | scm_i_thread *t; |
d823b11b | 1632 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1633 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1634 | return t->exited; |
5f05c406 | 1635 | } |
d823b11b | 1636 | #undef FUNC_NAME |
5f05c406 | 1637 | |
9de87eea | 1638 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1639 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1640 | static int threads_initialized_p = 0; |
1641 | ||
1642 | void | |
1643 | scm_i_thread_put_to_sleep () | |
1644 | { | |
6087fad9 | 1645 | if (threads_initialized_p) |
9bc4701c | 1646 | { |
9de87eea | 1647 | scm_i_thread *t; |
6087fad9 | 1648 | |
9de87eea MV |
1649 | scm_leave_guile (); |
1650 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1651 | ||
0c97d7dd MV |
1652 | /* Signal all threads to go to sleep |
1653 | */ | |
1654 | scm_i_thread_go_to_sleep = 1; | |
1655 | for (t = all_threads; t; t = t->next_thread) | |
1656 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1657 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1658 | } |
1659 | } | |
1660 | ||
b0dc3d71 MD |
1661 | void |
1662 | scm_i_thread_invalidate_freelists () | |
1663 | { | |
9de87eea MV |
1664 | /* thread_admin_mutex is already locked. */ |
1665 | ||
1666 | scm_i_thread *t; | |
1667 | for (t = all_threads; t; t = t->next_thread) | |
1668 | if (t != SCM_I_CURRENT_THREAD) | |
1669 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1670 | } |
1671 | ||
9bc4701c MD |
1672 | void |
1673 | scm_i_thread_wake_up () | |
1674 | { | |
6087fad9 | 1675 | if (threads_initialized_p) |
9bc4701c | 1676 | { |
9de87eea | 1677 | scm_i_thread *t; |
9de87eea | 1678 | |
0c97d7dd MV |
1679 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1680 | for (t = all_threads; t; t = t->next_thread) | |
1681 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1682 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1683 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1684 | } |
9bc4701c MD |
1685 | } |
1686 | ||
1687 | void | |
1688 | scm_i_thread_sleep_for_gc () | |
1689 | { | |
9de87eea MV |
1690 | scm_i_thread *t = suspend (); |
1691 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1692 | resume (t); |
9bc4701c MD |
1693 | } |
1694 | ||
a4d106c7 MV |
1695 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1696 | */ | |
d1138028 | 1697 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1698 | int scm_i_critical_section_level = 0; |
1699 | ||
661ae7ab | 1700 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1701 | |
9bc4701c | 1702 | void |
661ae7ab | 1703 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1704 | { |
a4d106c7 | 1705 | if (scm_is_false (mutex)) |
661ae7ab MV |
1706 | mutex = dynwind_critical_section_mutex; |
1707 | scm_dynwind_lock_mutex (mutex); | |
1708 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1709 | } |
1710 | ||
1711 | /*** Initialization */ | |
1712 | ||
1713 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1714 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1715 | ||
d1138028 MV |
1716 | #if SCM_USE_PTHREAD_THREADS |
1717 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1718 | #endif | |
1719 | ||
9de87eea MV |
1720 | void |
1721 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1722 | { | |
d1138028 MV |
1723 | #if SCM_USE_PTHREAD_THREADS |
1724 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1725 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1726 | PTHREAD_MUTEX_RECURSIVE); | |
1727 | #endif | |
1728 | ||
1729 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1730 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1731 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1732 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1733 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1734 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1735 | ||
1736 | guilify_self_1 (base); | |
9bc4701c MD |
1737 | } |
1738 | ||
d823b11b MV |
1739 | scm_t_bits scm_tc16_thread; |
1740 | scm_t_bits scm_tc16_mutex; | |
1741 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1742 | |
7bfd3b9e | 1743 | void |
9de87eea | 1744 | scm_init_threads () |
7bfd3b9e | 1745 | { |
9de87eea | 1746 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 1747 | scm_set_smob_print (scm_tc16_thread, thread_print); |
a4a141f6 | 1748 | scm_set_smob_free (scm_tc16_thread, thread_free); /* XXX: Could be removed */ |
d823b11b | 1749 | |
9de87eea | 1750 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
1751 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
1752 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1753 | |
9de87eea MV |
1754 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1755 | sizeof (fat_cond)); | |
9de87eea MV |
1756 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
1757 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 1758 | |
9de87eea MV |
1759 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1760 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1761 | threads_initialized_p = 1; |
a4d106c7 | 1762 | |
661ae7ab | 1763 | dynwind_critical_section_mutex = |
a4d106c7 | 1764 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 1765 | } |
89e00824 | 1766 | |
5f05c406 | 1767 | void |
9de87eea | 1768 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1769 | { |
9de87eea MV |
1770 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1771 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1772 | } |
1773 | ||
d823b11b | 1774 | void |
9de87eea | 1775 | scm_init_thread_procs () |
d823b11b | 1776 | { |
9de87eea | 1777 | #include "libguile/threads.x" |
d823b11b MV |
1778 | } |
1779 | ||
89e00824 ML |
1780 | /* |
1781 | Local Variables: | |
1782 | c-file-style: "gnu" | |
1783 | End: | |
1784 | */ |