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 | |
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> | |
fcc5d734 | 31 | #if HAVE_SYS_TIME_H |
d823b11b | 32 | #include <sys/time.h> |
fcc5d734 | 33 | #endif |
5f05c406 | 34 | |
d823b11b MV |
35 | #include "libguile/validate.h" |
36 | #include "libguile/root.h" | |
37 | #include "libguile/eval.h" | |
38 | #include "libguile/async.h" | |
39 | #include "libguile/ports.h" | |
40 | #include "libguile/threads.h" | |
a0599745 | 41 | #include "libguile/dynwind.h" |
d823b11b | 42 | #include "libguile/iselect.h" |
9de87eea MV |
43 | #include "libguile/fluids.h" |
44 | #include "libguile/continuations.h" | |
2b829bbb | 45 | #include "libguile/gc.h" |
9de87eea | 46 | #include "libguile/init.h" |
7bfd3b9e | 47 | |
ecc9f40f MV |
48 | #ifdef __MINGW32__ |
49 | #ifndef ETIMEDOUT | |
50 | # define ETIMEDOUT WSAETIMEDOUT | |
51 | #endif | |
52 | # include <fcntl.h> | |
53 | # include <process.h> | |
54 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
55 | #endif /* __MINGW32__ */ | |
56 | ||
d823b11b | 57 | /*** Queues */ |
7bfd3b9e | 58 | |
9de87eea MV |
59 | /* Make an empty queue data structure. |
60 | */ | |
d823b11b MV |
61 | static SCM |
62 | make_queue () | |
63 | { | |
64 | return scm_cons (SCM_EOL, SCM_EOL); | |
65 | } | |
7bfd3b9e | 66 | |
9de87eea MV |
67 | /* Put T at the back of Q and return a handle that can be used with |
68 | remqueue to remove T from Q again. | |
69 | */ | |
d823b11b MV |
70 | static SCM |
71 | enqueue (SCM q, SCM t) | |
72 | { | |
73 | SCM c = scm_cons (t, SCM_EOL); | |
d2e53ed6 | 74 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
75 | SCM_SETCDR (q, c); |
76 | else | |
77 | SCM_SETCDR (SCM_CAR (q), c); | |
78 | SCM_SETCAR (q, c); | |
79 | return c; | |
80 | } | |
7bfd3b9e | 81 | |
9de87eea MV |
82 | /* Remove the element that the handle C refers to from the queue Q. C |
83 | must have been returned from a call to enqueue. The return value | |
84 | is zero when the element referred to by C has already been removed. | |
85 | Otherwise, 1 is returned. | |
86 | */ | |
87 | static int | |
d823b11b MV |
88 | remqueue (SCM q, SCM c) |
89 | { | |
90 | SCM p, prev = q; | |
d2e53ed6 | 91 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 92 | { |
bc36d050 | 93 | if (scm_is_eq (p, c)) |
d823b11b | 94 | { |
bc36d050 | 95 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
96 | SCM_SETCAR (q, SCM_CDR (c)); |
97 | SCM_SETCDR (prev, SCM_CDR (c)); | |
9de87eea | 98 | return 1; |
d823b11b MV |
99 | } |
100 | prev = p; | |
101 | } | |
9de87eea | 102 | return 0; |
d823b11b MV |
103 | } |
104 | ||
9de87eea MV |
105 | /* Remove the front-most element from the queue Q and return it. |
106 | Return SCM_BOOL_F when Q is empty. | |
107 | */ | |
d823b11b MV |
108 | static SCM |
109 | dequeue (SCM q) | |
110 | { | |
111 | SCM c = SCM_CDR (q); | |
d2e53ed6 | 112 | if (scm_is_null (c)) |
d823b11b MV |
113 | return SCM_BOOL_F; |
114 | else | |
115 | { | |
116 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 117 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
118 | SCM_SETCAR (q, SCM_EOL); |
119 | return SCM_CAR (c); | |
120 | } | |
121 | } | |
7bfd3b9e | 122 | |
9de87eea | 123 | /*** Thread smob routines */ |
76da80e7 | 124 | |
d823b11b MV |
125 | |
126 | static int | |
127 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
128 | { | |
9de87eea | 129 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
d823b11b | 130 | scm_puts ("#<thread ", port); |
9de87eea | 131 | scm_uintprint ((size_t)t->pthread, 10, port); |
1b92fb6b | 132 | scm_puts (" (", port); |
0345e278 | 133 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 134 | scm_puts (")>", port); |
d823b11b MV |
135 | return 1; |
136 | } | |
137 | ||
138 | static size_t | |
139 | thread_free (SCM obj) | |
140 | { | |
9de87eea MV |
141 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
142 | assert (t->exited); | |
d823b11b MV |
143 | scm_gc_free (t, sizeof (*t), "thread"); |
144 | return 0; | |
145 | } | |
146 | ||
9de87eea | 147 | /*** Blocking on queues. */ |
f7eca35d | 148 | |
9de87eea MV |
149 | /* See also scm_i_queue_async_cell for how such a block is |
150 | interrputed. | |
151 | */ | |
d823b11b | 152 | |
9de87eea MV |
153 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
154 | be woken up by a call to 'unblock_from_queue', or to be | |
155 | interrupted. Upon return of this function, the current thread is | |
156 | no longer on QUEUE, even when the sleep has been interrupted. | |
157 | ||
158 | The QUEUE data structure is assumed to be protected by MUTEX and | |
159 | the caller of block_self must hold MUTEX. It will be atomically | |
160 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
161 | ||
162 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
163 | as MUTEX is needed. | |
164 | ||
165 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
166 | ||
167 | The return value of block_self is an errno value. It will be zero | |
168 | when the sleep has been successfully completed by a call to | |
169 | unblock_from_queue, EINTR when it has been interrupted by the | |
170 | delivery of a system async, and ETIMEDOUT when the timeout has | |
171 | expired. | |
172 | ||
173 | The system asyncs themselves are not executed by block_self. | |
174 | */ | |
175 | static int | |
176 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
177 | const scm_t_timespec *waittime) | |
76da80e7 | 178 | { |
9de87eea MV |
179 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
180 | SCM q_handle; | |
181 | int err; | |
182 | ||
183 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
184 | err = EINTR; | |
185 | else | |
186 | { | |
187 | t->block_asyncs++; | |
188 | q_handle = enqueue (queue, t->handle); | |
189 | if (waittime == NULL) | |
190 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
191 | else | |
192 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
193 | ||
194 | /* When we are still on QUEUE, we have been interrupted. We | |
195 | report this only when no other error (such as a timeout) has | |
196 | happened above. | |
197 | */ | |
198 | if (remqueue (queue, q_handle) && err == 0) | |
199 | err = EINTR; | |
200 | t->block_asyncs--; | |
201 | scm_i_reset_sleep (t); | |
202 | } | |
203 | ||
204 | return err; | |
76da80e7 | 205 | } |
9de87eea MV |
206 | |
207 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
208 | the mutex that protects QUEUE. The awoken thread is returned, or | |
209 | #f when the queue was empty. | |
210 | */ | |
211 | static SCM | |
212 | unblock_from_queue (SCM queue) | |
213 | { | |
214 | SCM thread = dequeue (queue); | |
215 | if (scm_is_true (thread)) | |
216 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
217 | return thread; | |
218 | } | |
219 | ||
220 | /* Getting into and out of guile mode. | |
221 | */ | |
222 | ||
98648121 MV |
223 | /* Ken Raeburn observes that the implementation of suspend and resume |
224 | (and the things that build on top of them) are very likely not | |
225 | correct (see below). We will need fix this eventually, and that's | |
226 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
227 | ||
228 | Ken writes: | |
229 | ||
230 | Consider this sequence: | |
231 | ||
232 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
233 | through scm_leave_guile), which does this: | |
234 | ||
235 | // record top of stack for the GC | |
236 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
237 | var 't' | |
238 | // save registers. | |
239 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
240 | setjmp (t->regs); // here's most of the magic | |
241 | ||
242 | ... and returns. | |
243 | ||
244 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
245 | a caller-saved register R, and it's the only reference to the object | |
246 | currently. | |
247 | ||
248 | The compiler wants to use R in suspend, so it pushes the current | |
249 | value, X, into a stack slot which will be reloaded on exit from | |
250 | suspend; then it loads stuff into R and goes about its business. The | |
251 | setjmp call saves (some of) the current registers, including R, which | |
252 | no longer contains X. (This isn't a problem for a normal | |
253 | setjmp/longjmp situation, where longjmp would be called before | |
254 | setjmp's caller returns; the old value for X would be loaded back from | |
255 | the stack after the longjmp, before the function returned.) | |
256 | ||
257 | So, suspend returns, loading X back into R (and invalidating the jump | |
258 | buffer) in the process. The caller foo then goes off and calls a | |
259 | bunch of other functions out of Guile mode, occasionally storing X on | |
260 | the stack again, but, say, much deeper on the stack than suspend's | |
261 | stack frame went, and the stack slot where suspend had written X has | |
262 | long since been overwritten with other values. | |
263 | ||
264 | Okay, nothing actively broken so far. Now, let garbage collection | |
265 | run, triggered by another thread. | |
266 | ||
267 | The thread calling foo is out of Guile mode at the time, so the | |
268 | garbage collector just scans a range of stack addresses. Too bad that | |
269 | X isn't stored there. So the pointed-to storage goes onto the free | |
270 | list, and I think you can see where things go from there. | |
271 | ||
272 | Is there anything I'm missing that'll prevent this scenario from | |
273 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
274 | don't have many local variables, so they probably won't need to save | |
275 | any registers on most systems, so we hope everything will wind up in | |
276 | the jump buffer and we'll just get away with it"? | |
277 | ||
278 | (And, going the other direction, if scm_leave_guile and suspend push | |
279 | the stack pointer over onto a new page, and foo doesn't make further | |
280 | function calls and thus the stack pointer no longer includes that | |
281 | page, are we guaranteed that the kernel cannot release the now-unused | |
282 | stack page that contains the top-of-stack pointer we just saved? I | |
283 | don't know if any OS actually does that. If it does, we could get | |
284 | faults in garbage collection.) | |
285 | ||
286 | I don't think scm_without_guile has to have this problem, as it gets | |
287 | more control over the stack handling -- but it should call setjmp | |
288 | itself. I'd probably try something like: | |
289 | ||
290 | // record top of stack for the GC | |
291 | t->top = SCM_STACK_PTR (&t); | |
292 | // save registers. | |
293 | SCM_FLUSH_REGISTER_WINDOWS; | |
294 | setjmp (t->regs); | |
295 | res = func(data); | |
296 | scm_enter_guile (t); | |
297 | ||
298 | ... though even that's making some assumptions about the stack | |
299 | ordering of local variables versus caller-saved registers. | |
300 | ||
301 | For something like scm_leave_guile to work, I don't think it can just | |
302 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
303 | on the stack state at the point when the jump buffer was initialized, | |
304 | together, would work fine, but I think then we're talking about macros | |
305 | invoking setjmp in the caller's stack frame, and requiring that the | |
306 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
307 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
308 | in a function. (In fact, the pthread ones have to be paired up | |
309 | syntactically, as if they might expand to a compound statement | |
310 | incorporating the user's code, and invoking a compiler's | |
311 | exception-handling primitives. Which might be something to think | |
312 | about for cases where Guile is used with C++ exceptions or | |
313 | pthread_cancel.) | |
314 | */ | |
315 | ||
9de87eea MV |
316 | scm_i_pthread_key_t scm_i_thread_key; |
317 | ||
d823b11b | 318 | static void |
9de87eea | 319 | resume (scm_i_thread *t) |
d823b11b | 320 | { |
d823b11b | 321 | t->top = NULL; |
9bc4701c MD |
322 | if (t->clear_freelists_p) |
323 | { | |
324 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
325 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
326 | t->clear_freelists_p = 0; | |
327 | } | |
d823b11b MV |
328 | } |
329 | ||
98648121 MV |
330 | typedef void* scm_t_guile_ticket; |
331 | ||
332 | static void | |
9de87eea | 333 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 334 | { |
9de87eea MV |
335 | scm_i_thread *t = (scm_i_thread *)ticket; |
336 | if (t) | |
337 | { | |
338 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
339 | resume (t); | |
340 | } | |
d823b11b MV |
341 | } |
342 | ||
9de87eea MV |
343 | static scm_i_thread * |
344 | suspend (void) | |
d823b11b | 345 | { |
9de87eea | 346 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
347 | |
348 | /* record top of stack for the GC */ | |
9de87eea | 349 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
350 | /* save registers. */ |
351 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
352 | setjmp (t->regs); |
353 | return t; | |
d823b11b MV |
354 | } |
355 | ||
98648121 | 356 | static scm_t_guile_ticket |
9de87eea | 357 | scm_leave_guile () |
d823b11b | 358 | { |
9de87eea MV |
359 | scm_i_thread *t = suspend (); |
360 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
361 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
362 | } |
363 | ||
9de87eea MV |
364 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
365 | static scm_i_thread *all_threads = NULL; | |
366 | static int thread_count; | |
367 | ||
368 | static SCM scm_i_default_dynamic_state; | |
369 | ||
370 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 371 | */ |
9de87eea MV |
372 | static void |
373 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 374 | { |
c812243b | 375 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
376 | |
377 | t->pthread = scm_i_pthread_self (); | |
378 | t->handle = SCM_BOOL_F; | |
379 | t->result = SCM_BOOL_F; | |
380 | t->join_queue = SCM_EOL; | |
381 | t->dynamic_state = SCM_BOOL_F; | |
382 | t->dynwinds = SCM_EOL; | |
383 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
384 | t->block_asyncs = 1; |
385 | t->pending_asyncs = 1; | |
386 | t->last_debug_frame = NULL; | |
387 | t->base = base; | |
0c97d7dd | 388 | t->continuation_root = SCM_EOL; |
9de87eea MV |
389 | t->continuation_base = base; |
390 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
391 | t->sleep_mutex = NULL; | |
392 | t->sleep_object = SCM_BOOL_F; | |
393 | t->sleep_fd = -1; | |
0c97d7dd | 394 | /* XXX - check for errors. */ |
9de87eea MV |
395 | pipe (t->sleep_pipe); |
396 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
397 | t->clear_freelists_p = 0; | |
1a8fdd7e | 398 | t->gc_running_p = 0; |
378f2625 LC |
399 | t->current_mark_stack_ptr = NULL; |
400 | t->current_mark_stack_limit = NULL; | |
9de87eea MV |
401 | t->exited = 0; |
402 | ||
403 | t->freelist = SCM_EOL; | |
404 | t->freelist2 = SCM_EOL; | |
405 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
406 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
407 | ||
408 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
409 | ||
410 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
411 | ||
412 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
413 | t->next_thread = all_threads; | |
414 | all_threads = t; | |
415 | thread_count++; | |
416 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
417 | } |
418 | ||
9de87eea | 419 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 420 | */ |
9de87eea MV |
421 | static void |
422 | guilify_self_2 (SCM parent) | |
d823b11b | 423 | { |
9de87eea MV |
424 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
425 | ||
426 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
c812243b | 427 | |
9de87eea MV |
428 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
429 | t->continuation_base = t->base; | |
430 | ||
431 | if (scm_is_true (parent)) | |
432 | t->dynamic_state = scm_make_dynamic_state (parent); | |
433 | else | |
434 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
435 | ||
436 | t->join_queue = make_queue (); | |
437 | t->block_asyncs = 0; | |
d823b11b MV |
438 | } |
439 | ||
9de87eea | 440 | /* Perform thread tear-down, in guile mode. |
d823b11b | 441 | */ |
9de87eea MV |
442 | static void * |
443 | do_thread_exit (void *v) | |
444 | { | |
0c97d7dd | 445 | scm_i_thread *t = (scm_i_thread *)v; |
9de87eea MV |
446 | |
447 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
448 | ||
449 | t->exited = 1; | |
0c97d7dd MV |
450 | close (t->sleep_pipe[0]); |
451 | close (t->sleep_pipe[1]); | |
9de87eea MV |
452 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
453 | ; | |
9de87eea MV |
454 | |
455 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
456 | return NULL; | |
457 | } | |
458 | ||
d823b11b | 459 | static void |
9de87eea | 460 | on_thread_exit (void *v) |
d823b11b | 461 | { |
0c97d7dd MV |
462 | scm_i_thread *t = (scm_i_thread *)v, **tp; |
463 | ||
9de87eea | 464 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd MV |
465 | |
466 | /* Unblocking the joining threads needs to happen in guile mode | |
467 | since the queue is a SCM data structure. | |
468 | */ | |
9de87eea | 469 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
470 | |
471 | /* Removing ourself from the list of all threads needs to happen in | |
472 | non-guile mode since all SCM values on our stack become | |
473 | unprotected once we are no longer in the list. | |
474 | */ | |
475 | scm_leave_guile (); | |
476 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
477 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
478 | if (*tp == t) | |
479 | { | |
480 | *tp = t->next_thread; | |
481 | break; | |
482 | } | |
483 | thread_count--; | |
484 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
485 | ||
9de87eea | 486 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
487 | } |
488 | ||
9de87eea | 489 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 490 | |
9de87eea MV |
491 | static void |
492 | init_thread_key (void) | |
493 | { | |
494 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
495 | } | |
d823b11b | 496 | |
9de87eea MV |
497 | /* Perform any initializations necessary to bring the current thread |
498 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 499 | |
9de87eea MV |
500 | BASE is the stack base to use with GC. |
501 | ||
502 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
503 | which case the default dynamic state is used. | |
504 | ||
505 | Return zero when the thread was in guile mode already; otherwise | |
506 | return 1. | |
507 | */ | |
508 | ||
509 | static int | |
510 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 511 | { |
9de87eea MV |
512 | scm_i_thread *t; |
513 | ||
514 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
515 | ||
516 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
517 | { | |
518 | /* This thread has not been guilified yet. | |
519 | */ | |
520 | ||
521 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
522 | if (scm_initialized_p == 0) | |
523 | { | |
524 | /* First thread ever to enter Guile. Run the full | |
525 | initialization. | |
526 | */ | |
527 | scm_i_init_guile (base); | |
528 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
529 | } | |
530 | else | |
531 | { | |
532 | /* Guile is already initialized, but this thread enters it for | |
533 | the first time. Only initialize this thread. | |
534 | */ | |
535 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
536 | guilify_self_1 (base); | |
537 | guilify_self_2 (parent); | |
538 | } | |
539 | return 1; | |
540 | } | |
541 | else if (t->top) | |
542 | { | |
543 | /* This thread is already guilified but not in guile mode, just | |
544 | resume it. | |
545 | ||
546 | XXX - base might be lower than when this thread was first | |
547 | guilified. | |
548 | */ | |
549 | scm_enter_guile ((scm_t_guile_ticket) t); | |
550 | return 1; | |
551 | } | |
552 | else | |
553 | { | |
554 | /* Thread is already in guile mode. Nothing to do. | |
555 | */ | |
556 | return 0; | |
557 | } | |
d823b11b MV |
558 | } |
559 | ||
9de87eea MV |
560 | #if SCM_USE_PTHREAD_THREADS |
561 | #ifdef HAVE_PTHREAD_ATTR_GETSTACK | |
562 | ||
563 | #define HAVE_GET_THREAD_STACK_BASE | |
564 | ||
565 | static SCM_STACKITEM * | |
566 | get_thread_stack_base () | |
d823b11b | 567 | { |
9de87eea MV |
568 | pthread_attr_t attr; |
569 | void *start, *end; | |
570 | size_t size; | |
571 | ||
9de87eea MV |
572 | pthread_getattr_np (pthread_self (), &attr); |
573 | pthread_attr_getstack (&attr, &start, &size); | |
574 | end = (char *)start + size; | |
575 | ||
2b829bbb KR |
576 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
577 | for the main thread, but we can use scm_get_stack_base in that | |
578 | case. | |
579 | */ | |
580 | ||
581 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 582 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 583 | return scm_get_stack_base (); |
9de87eea | 584 | else |
2b829bbb | 585 | #endif |
9de87eea MV |
586 | { |
587 | #if SCM_STACK_GROWS_UP | |
588 | return start; | |
589 | #else | |
590 | return end; | |
591 | #endif | |
592 | } | |
a54a94b3 MV |
593 | } |
594 | ||
9de87eea MV |
595 | #endif /* HAVE_PTHREAD_ATTR_GETSTACK */ |
596 | ||
597 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
598 | ||
599 | #define HAVE_GET_THREAD_STACK_BASE | |
600 | ||
601 | static SCM_STACKITEM * | |
602 | get_thread_stack_base () | |
a54a94b3 | 603 | { |
2b829bbb | 604 | return scm_get_stack_base (); |
d823b11b MV |
605 | } |
606 | ||
9de87eea | 607 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
608 | |
609 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
610 | ||
611 | void | |
612 | scm_init_guile () | |
d823b11b | 613 | { |
9de87eea MV |
614 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
615 | scm_i_default_dynamic_state); | |
d823b11b MV |
616 | } |
617 | ||
9de87eea MV |
618 | #endif |
619 | ||
620 | void * | |
621 | scm_with_guile (void *(*func)(void *), void *data) | |
622 | { | |
623 | return scm_i_with_guile_and_parent (func, data, | |
624 | scm_i_default_dynamic_state); | |
625 | } | |
626 | ||
627 | void * | |
628 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, | |
629 | SCM parent) | |
630 | { | |
631 | void *res; | |
632 | int really_entered; | |
633 | SCM_STACKITEM base_item; | |
634 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); | |
635 | res = scm_c_with_continuation_barrier (func, data); | |
636 | if (really_entered) | |
637 | scm_leave_guile (); | |
638 | return res; | |
639 | } | |
640 | ||
641 | void * | |
642 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 643 | { |
9de87eea MV |
644 | void *res; |
645 | scm_t_guile_ticket t; | |
646 | t = scm_leave_guile (); | |
647 | res = func (data); | |
648 | scm_enter_guile (t); | |
649 | return res; | |
650 | } | |
651 | ||
652 | /*** Thread creation */ | |
653 | ||
654 | typedef struct { | |
655 | SCM parent; | |
656 | SCM thunk; | |
657 | SCM handler; | |
76da80e7 | 658 | SCM thread; |
9de87eea MV |
659 | scm_i_pthread_mutex_t mutex; |
660 | scm_i_pthread_cond_t cond; | |
661 | } launch_data; | |
d823b11b | 662 | |
9de87eea MV |
663 | static void * |
664 | really_launch (void *d) | |
665 | { | |
666 | launch_data *data = (launch_data *)d; | |
667 | SCM thunk = data->thunk, handler = data->handler; | |
668 | scm_i_thread *t; | |
d823b11b | 669 | |
9de87eea | 670 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 671 | |
9de87eea MV |
672 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
673 | data->thread = scm_current_thread (); | |
674 | scm_i_pthread_cond_signal (&data->cond); | |
675 | scm_i_pthread_mutex_unlock (&data->mutex); | |
676 | ||
677 | if (SCM_UNBNDP (handler)) | |
678 | t->result = scm_call_0 (thunk); | |
679 | else | |
680 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
681 | ||
682 | return 0; | |
d823b11b MV |
683 | } |
684 | ||
9de87eea MV |
685 | static void * |
686 | launch_thread (void *d) | |
687 | { | |
688 | launch_data *data = (launch_data *)d; | |
689 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
690 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
691 | return NULL; | |
692 | } | |
693 | ||
694 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 695 | (SCM thunk, SCM handler), |
9de87eea MV |
696 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
697 | "returning a new thread object representing the thread. The procedure\n" | |
698 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
699 | "\n" | |
700 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
701 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
702 | "handler. This catch is established inside the continuation barrier.\n" | |
703 | "\n" | |
704 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
705 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
706 | #define FUNC_NAME s_scm_call_with_new_thread |
707 | { | |
9de87eea MV |
708 | launch_data data; |
709 | scm_i_pthread_t id; | |
710 | int err; | |
d823b11b | 711 | |
9de87eea MV |
712 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
713 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
714 | handler, SCM_ARG2, FUNC_NAME); | |
715 | ||
716 | data.parent = scm_current_dynamic_state (); | |
717 | data.thunk = thunk; | |
718 | data.handler = handler; | |
719 | data.thread = SCM_BOOL_F; | |
720 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
721 | scm_i_pthread_cond_init (&data.cond, NULL); | |
722 | ||
723 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
724 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
725 | if (err) | |
726 | { | |
727 | scm_i_pthread_mutex_unlock (&data.mutex); | |
728 | errno = err; | |
729 | scm_syserror (NULL); | |
730 | } | |
731 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
732 | scm_i_pthread_mutex_unlock (&data.mutex); | |
733 | ||
734 | return data.thread; | |
d823b11b MV |
735 | } |
736 | #undef FUNC_NAME | |
737 | ||
9de87eea MV |
738 | typedef struct { |
739 | SCM parent; | |
740 | scm_t_catch_body body; | |
741 | void *body_data; | |
742 | scm_t_catch_handler handler; | |
743 | void *handler_data; | |
744 | SCM thread; | |
745 | scm_i_pthread_mutex_t mutex; | |
746 | scm_i_pthread_cond_t cond; | |
747 | } spawn_data; | |
748 | ||
749 | static void * | |
750 | really_spawn (void *d) | |
751 | { | |
752 | spawn_data *data = (spawn_data *)d; | |
753 | scm_t_catch_body body = data->body; | |
754 | void *body_data = data->body_data; | |
755 | scm_t_catch_handler handler = data->handler; | |
756 | void *handler_data = data->handler_data; | |
757 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
758 | ||
759 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
760 | data->thread = scm_current_thread (); | |
761 | scm_i_pthread_cond_signal (&data->cond); | |
762 | scm_i_pthread_mutex_unlock (&data->mutex); | |
763 | ||
764 | if (handler == NULL) | |
765 | t->result = body (body_data); | |
766 | else | |
767 | t->result = scm_internal_catch (SCM_BOOL_T, | |
768 | body, body_data, | |
769 | handler, handler_data); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static void * | |
775 | spawn_thread (void *d) | |
776 | { | |
777 | spawn_data *data = (spawn_data *)d; | |
778 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
779 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
780 | return NULL; | |
781 | } | |
782 | ||
783 | SCM | |
784 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
785 | scm_t_catch_handler handler, void *handler_data) | |
786 | { | |
787 | spawn_data data; | |
788 | scm_i_pthread_t id; | |
789 | int err; | |
790 | ||
791 | data.parent = scm_current_dynamic_state (); | |
792 | data.body = body; | |
793 | data.body_data = body_data; | |
794 | data.handler = handler; | |
795 | data.handler_data = handler_data; | |
796 | data.thread = SCM_BOOL_F; | |
797 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
798 | scm_i_pthread_cond_init (&data.cond, NULL); | |
799 | ||
800 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
801 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
802 | if (err) | |
803 | { | |
804 | scm_i_pthread_mutex_unlock (&data.mutex); | |
805 | errno = err; | |
806 | scm_syserror (NULL); | |
807 | } | |
808 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
809 | scm_i_pthread_mutex_unlock (&data.mutex); | |
810 | ||
811 | return data.thread; | |
812 | } | |
813 | ||
29717c89 MD |
814 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
815 | (), | |
816 | "Move the calling thread to the end of the scheduling queue.") | |
817 | #define FUNC_NAME s_scm_yield | |
818 | { | |
9de87eea | 819 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
820 | } |
821 | #undef FUNC_NAME | |
822 | ||
d823b11b | 823 | SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0, |
5f05c406 | 824 | (SCM thread), |
d823b11b MV |
825 | "Suspend execution of the calling thread until the target @var{thread} " |
826 | "terminates, unless the target @var{thread} has already terminated. ") | |
827 | #define FUNC_NAME s_scm_join_thread | |
5f05c406 | 828 | { |
9de87eea | 829 | scm_i_thread *t; |
d823b11b MV |
830 | SCM res; |
831 | ||
832 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 833 | if (scm_is_eq (scm_current_thread (), thread)) |
d823b11b MV |
834 | SCM_MISC_ERROR ("can not join the current thread", SCM_EOL); |
835 | ||
9de87eea MV |
836 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); |
837 | ||
838 | t = SCM_I_THREAD_DATA (thread); | |
d823b11b MV |
839 | if (!t->exited) |
840 | { | |
9de87eea MV |
841 | while (1) |
842 | { | |
843 | block_self (t->join_queue, thread, &thread_admin_mutex, NULL); | |
844 | if (t->exited) | |
845 | break; | |
846 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
847 | SCM_TICK; | |
848 | scm_i_scm_pthread_mutex_lock (&thread_admin_mutex); | |
849 | } | |
d823b11b MV |
850 | } |
851 | res = t->result; | |
9de87eea MV |
852 | |
853 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b | 854 | return res; |
5f05c406 MV |
855 | } |
856 | #undef FUNC_NAME | |
857 | ||
9de87eea | 858 | /*** Fat mutexes */ |
4079f87e | 859 | |
d823b11b MV |
860 | /* We implement our own mutex type since we want them to be 'fair', we |
861 | want to do fancy things while waiting for them (like running | |
9de87eea MV |
862 | asyncs) and we might want to add things that are nice for |
863 | debugging. | |
d823b11b | 864 | */ |
4079f87e | 865 | |
9de87eea MV |
866 | typedef struct { |
867 | scm_i_pthread_mutex_t lock; | |
d823b11b | 868 | SCM owner; |
9de87eea MV |
869 | int level; /* how much the owner owns us. |
870 | < 0 for non-recursive mutexes */ | |
871 | SCM waiting; /* the threads waiting for this mutex. */ | |
872 | } fat_mutex; | |
873 | ||
874 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
875 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
5f05c406 | 876 | |
4079f87e | 877 | |
9de87eea MV |
878 | static size_t |
879 | fat_mutex_free (SCM mx) | |
76da80e7 | 880 | { |
9de87eea MV |
881 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
882 | scm_i_pthread_mutex_destroy (&m->lock); | |
883 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
884 | return 0; |
885 | } | |
886 | ||
887 | static int | |
9de87eea | 888 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 889 | { |
9de87eea MV |
890 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
891 | scm_puts ("#<mutex ", port); | |
892 | scm_uintprint ((scm_t_bits)m, 16, port); | |
893 | scm_puts (">", port); | |
894 | return 1; | |
76da80e7 MV |
895 | } |
896 | ||
76da80e7 | 897 | static SCM |
9de87eea | 898 | make_fat_mutex (int recursive) |
76da80e7 | 899 | { |
9de87eea MV |
900 | fat_mutex *m; |
901 | SCM mx; | |
902 | ||
903 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
904 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
905 | m->owner = SCM_BOOL_F; | |
906 | m->level = recursive? 0 : -1; | |
907 | m->waiting = SCM_EOL; | |
908 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
909 | m->waiting = make_queue (); | |
910 | return mx; | |
76da80e7 MV |
911 | } |
912 | ||
9de87eea | 913 | SCM_DEFINE (scm_make_mutex, "make-mutex", 0, 0, 0, |
76da80e7 | 914 | (void), |
9de87eea MV |
915 | "Create a new mutex. ") |
916 | #define FUNC_NAME s_scm_make_mutex | |
76da80e7 | 917 | { |
9de87eea | 918 | return make_fat_mutex (0); |
76da80e7 MV |
919 | } |
920 | #undef FUNC_NAME | |
921 | ||
9de87eea | 922 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 923 | (void), |
9de87eea MV |
924 | "Create a new recursive mutex. ") |
925 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 926 | { |
9de87eea | 927 | return make_fat_mutex (1); |
9bc4701c MD |
928 | } |
929 | #undef FUNC_NAME | |
930 | ||
9de87eea MV |
931 | static char * |
932 | fat_mutex_lock (SCM mutex) | |
933 | { | |
934 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
935 | SCM thread = scm_current_thread (); | |
936 | char *msg = NULL; | |
937 | ||
938 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
939 | if (scm_is_false (m->owner)) | |
940 | m->owner = thread; | |
941 | else if (scm_is_eq (m->owner, thread)) | |
942 | { | |
943 | if (m->level >= 0) | |
944 | m->level++; | |
945 | else | |
946 | msg = "mutex already locked by current thread"; | |
947 | } | |
948 | else | |
949 | { | |
950 | while (1) | |
951 | { | |
952 | block_self (m->waiting, mutex, &m->lock, NULL); | |
953 | if (scm_is_eq (m->owner, thread)) | |
954 | break; | |
955 | scm_i_pthread_mutex_unlock (&m->lock); | |
956 | SCM_TICK; | |
957 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
958 | } | |
959 | } | |
960 | scm_i_pthread_mutex_unlock (&m->lock); | |
961 | return msg; | |
962 | } | |
963 | ||
9bc4701c MD |
964 | SCM_DEFINE (scm_lock_mutex, "lock-mutex", 1, 0, 0, |
965 | (SCM mx), | |
966 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " | |
967 | "blocks until the mutex becomes available. The function returns when " | |
968 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
969 | "a thread already owns will succeed right away and will not block the " | |
970 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
971 | #define FUNC_NAME s_scm_lock_mutex | |
972 | { | |
9de87eea | 973 | char *msg; |
76da80e7 | 974 | |
b01532af | 975 | SCM_VALIDATE_MUTEX (1, mx); |
9de87eea MV |
976 | msg = fat_mutex_lock (mx); |
977 | if (msg) | |
978 | scm_misc_error (NULL, msg, SCM_EOL); | |
76da80e7 | 979 | return SCM_BOOL_T; |
9bc4701c | 980 | } |
76da80e7 | 981 | #undef FUNC_NAME |
9bc4701c | 982 | |
a4d106c7 | 983 | void |
661ae7ab | 984 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 985 | { |
661ae7ab MV |
986 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
987 | SCM_F_WIND_EXPLICITLY); | |
988 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
989 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
990 | } |
991 | ||
9de87eea MV |
992 | static char * |
993 | fat_mutex_trylock (fat_mutex *m, int *resp) | |
994 | { | |
995 | char *msg = NULL; | |
996 | SCM thread = scm_current_thread (); | |
997 | ||
998 | *resp = 1; | |
999 | scm_i_pthread_mutex_lock (&m->lock); | |
1000 | if (scm_is_false (m->owner)) | |
1001 | m->owner = thread; | |
1002 | else if (scm_is_eq (m->owner, thread)) | |
1003 | { | |
1004 | if (m->level >= 0) | |
1005 | m->level++; | |
1006 | else | |
1007 | msg = "mutex already locked by current thread"; | |
1008 | } | |
1009 | else | |
1010 | *resp = 0; | |
1011 | scm_i_pthread_mutex_unlock (&m->lock); | |
1012 | return msg; | |
1013 | } | |
1014 | ||
9bc4701c | 1015 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1016 | (SCM mutex), |
9bc4701c MD |
1017 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1018 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1019 | #define FUNC_NAME s_scm_try_mutex | |
1020 | { | |
9de87eea MV |
1021 | char *msg; |
1022 | int res; | |
1023 | ||
ba1b7223 | 1024 | SCM_VALIDATE_MUTEX (1, mutex); |
9bc4701c | 1025 | |
ba1b7223 | 1026 | msg = fat_mutex_trylock (SCM_MUTEX_DATA (mutex), &res); |
9de87eea MV |
1027 | if (msg) |
1028 | scm_misc_error (NULL, msg, SCM_EOL); | |
1029 | return scm_from_bool (res); | |
1030 | } | |
1031 | #undef FUNC_NAME | |
76da80e7 | 1032 | |
9de87eea MV |
1033 | static char * |
1034 | fat_mutex_unlock (fat_mutex *m) | |
1035 | { | |
1036 | char *msg = NULL; | |
1037 | ||
1038 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1039 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1040 | { |
9de87eea MV |
1041 | if (scm_is_false (m->owner)) |
1042 | msg = "mutex not locked"; | |
1043 | else | |
1044 | msg = "mutex not locked by current thread"; | |
9bc4701c | 1045 | } |
9de87eea MV |
1046 | else if (m->level > 0) |
1047 | m->level--; | |
1048 | else | |
1049 | m->owner = unblock_from_queue (m->waiting); | |
1050 | scm_i_pthread_mutex_unlock (&m->lock); | |
1051 | ||
1052 | return msg; | |
9bc4701c | 1053 | } |
9bc4701c MD |
1054 | |
1055 | SCM_DEFINE (scm_unlock_mutex, "unlock-mutex", 1, 0, 0, | |
1056 | (SCM mx), | |
1057 | "Unlocks @var{mutex} if the calling thread owns the lock on " | |
1058 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1059 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1060 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1061 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1062 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1063 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
1064 | #define FUNC_NAME s_scm_unlock_mutex | |
1065 | { | |
9de87eea | 1066 | char *msg; |
9bc4701c MD |
1067 | SCM_VALIDATE_MUTEX (1, mx); |
1068 | ||
9de87eea MV |
1069 | msg = fat_mutex_unlock (SCM_MUTEX_DATA (mx)); |
1070 | if (msg) | |
1071 | scm_misc_error (NULL, msg, SCM_EOL); | |
9bc4701c MD |
1072 | return SCM_BOOL_T; |
1073 | } | |
1074 | #undef FUNC_NAME | |
1075 | ||
9de87eea MV |
1076 | #if 0 |
1077 | ||
1078 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1079 | (SCM mx), | |
1080 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1081 | #define FUNC_NAME s_scm_mutex_owner | |
1082 | { | |
1083 | SCM_VALIDATE_MUTEX (1, mx); | |
1084 | return (SCM_MUTEX_DATA(mx))->owner; | |
1085 | } | |
1086 | #undef FUNC_NAME | |
1087 | ||
1088 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1089 | (SCM mx), | |
1090 | "Return the lock level of a recursive mutex, or -1\n" | |
1091 | "for a standard mutex.") | |
1092 | #define FUNC_NAME s_scm_mutex_level | |
1093 | { | |
1094 | SCM_VALIDATE_MUTEX (1, mx); | |
1095 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1096 | } | |
1097 | #undef FUNC_NAME | |
1098 | ||
1099 | #endif | |
1100 | ||
1101 | /*** Fat condition variables */ | |
1102 | ||
1103 | typedef struct { | |
1104 | scm_i_pthread_mutex_t lock; | |
1105 | SCM waiting; /* the threads waiting for this condition. */ | |
1106 | } fat_cond; | |
1107 | ||
1108 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1109 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1110 | ||
9de87eea MV |
1111 | static size_t |
1112 | fat_cond_free (SCM mx) | |
1113 | { | |
1114 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1115 | scm_i_pthread_mutex_destroy (&c->lock); | |
1116 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static int | |
1121 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1122 | { | |
1123 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1124 | scm_puts ("#<condition-variable ", port); | |
1125 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1126 | scm_puts (">", port); | |
1127 | return 1; | |
1128 | } | |
9bc4701c | 1129 | |
d823b11b MV |
1130 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1131 | (void), | |
1132 | "Make a new condition variable.") | |
1133 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1134 | { |
9de87eea MV |
1135 | fat_cond *c; |
1136 | SCM cv; | |
1137 | ||
1138 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1139 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1140 | c->waiting = SCM_EOL; | |
1141 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1142 | c->waiting = make_queue (); | |
d823b11b | 1143 | return cv; |
5f05c406 | 1144 | } |
d823b11b | 1145 | #undef FUNC_NAME |
5f05c406 | 1146 | |
9de87eea MV |
1147 | static int |
1148 | fat_cond_timedwait (SCM cond, SCM mutex, | |
1149 | const scm_t_timespec *waittime) | |
1150 | { | |
1151 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1152 | fat_cond *c = SCM_CONDVAR_DATA (cond); | |
1153 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
1154 | const char *msg; | |
1155 | int err = 0; | |
1156 | ||
1157 | while (1) | |
1158 | { | |
9de87eea MV |
1159 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1160 | msg = fat_mutex_unlock (m); | |
1161 | t->block_asyncs++; | |
1162 | if (msg == NULL) | |
1163 | { | |
1164 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1165 | scm_i_pthread_mutex_unlock (&c->lock); | |
9de87eea MV |
1166 | fat_mutex_lock (mutex); |
1167 | } | |
1168 | else | |
1169 | scm_i_pthread_mutex_unlock (&c->lock); | |
1170 | t->block_asyncs--; | |
1171 | scm_async_click (); | |
1172 | ||
9de87eea MV |
1173 | if (msg) |
1174 | scm_misc_error (NULL, msg, SCM_EOL); | |
1175 | ||
1176 | scm_remember_upto_here_2 (cond, mutex); | |
1177 | ||
1178 | if (err == 0) | |
1179 | return 1; | |
1180 | if (err == ETIMEDOUT) | |
1181 | return 0; | |
1182 | if (err != EINTR) | |
1183 | { | |
1184 | errno = err; | |
1185 | scm_syserror (NULL); | |
1186 | } | |
1187 | } | |
1188 | } | |
1189 | ||
d823b11b MV |
1190 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1191 | (SCM cv, SCM mx, SCM t), | |
1192 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1193 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1194 | "is locked again when this function returns. When @var{time} is given, " | |
1195 | "it specifies a point in time where the waiting should be aborted. It " | |
1196 | "can be either a integer as returned by @code{current-time} or a pair " | |
1197 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1198 | "mutex is locked and @code{#f} is returned. When the condition " | |
1199 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1200 | "is returned. ") | |
1201 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1202 | { |
9de87eea | 1203 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1204 | |
1205 | SCM_VALIDATE_CONDVAR (1, cv); | |
1206 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1207 | |
d823b11b MV |
1208 | if (!SCM_UNBNDP (t)) |
1209 | { | |
d2e53ed6 | 1210 | if (scm_is_pair (t)) |
d823b11b | 1211 | { |
9de87eea MV |
1212 | waittime.tv_sec = scm_to_ulong (SCM_CAR (t)); |
1213 | waittime.tv_nsec = scm_to_ulong (SCM_CAR (t)) * 1000; | |
d823b11b MV |
1214 | } |
1215 | else | |
1216 | { | |
9de87eea | 1217 | waittime.tv_sec = scm_to_ulong (t); |
d823b11b MV |
1218 | waittime.tv_nsec = 0; |
1219 | } | |
9de87eea | 1220 | waitptr = &waittime; |
d823b11b MV |
1221 | } |
1222 | ||
9de87eea | 1223 | return scm_from_bool (fat_cond_timedwait (cv, mx, waitptr)); |
5f05c406 | 1224 | } |
d823b11b | 1225 | #undef FUNC_NAME |
5f05c406 | 1226 | |
9de87eea MV |
1227 | static void |
1228 | fat_cond_signal (fat_cond *c) | |
1229 | { | |
9de87eea MV |
1230 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1231 | unblock_from_queue (c->waiting); | |
1232 | scm_i_pthread_mutex_unlock (&c->lock); | |
1233 | } | |
1234 | ||
d823b11b MV |
1235 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1236 | (SCM cv), | |
1237 | "Wake up one thread that is waiting for @var{cv}") | |
1238 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1239 | { |
d823b11b | 1240 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1241 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1242 | return SCM_BOOL_T; |
5f05c406 | 1243 | } |
d823b11b | 1244 | #undef FUNC_NAME |
5f05c406 | 1245 | |
9de87eea MV |
1246 | static void |
1247 | fat_cond_broadcast (fat_cond *c) | |
1248 | { | |
1249 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1250 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1251 | ; | |
1252 | scm_i_pthread_mutex_unlock (&c->lock); | |
1253 | } | |
1254 | ||
d823b11b MV |
1255 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1256 | (SCM cv), | |
1257 | "Wake up all threads that are waiting for @var{cv}. ") | |
1258 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1259 | { |
d823b11b | 1260 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1261 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1262 | return SCM_BOOL_T; |
5f05c406 | 1263 | } |
d823b11b | 1264 | #undef FUNC_NAME |
5f05c406 | 1265 | |
d823b11b MV |
1266 | /*** Marking stacks */ |
1267 | ||
1268 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1269 | threads as well? | |
1270 | */ | |
1271 | #ifdef __ia64__ | |
1272 | # define SCM_MARK_BACKING_STORE() do { \ | |
1273 | ucontext_t ctx; \ | |
1274 | SCM_STACKITEM * top, * bot; \ | |
1275 | getcontext (&ctx); \ | |
1276 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1277 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1278 | / sizeof (SCM_STACKITEM))); \ | |
1279 | bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \ | |
1280 | top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \ | |
1281 | scm_mark_locations (bot, top - bot); } while (0) | |
1282 | #else | |
1283 | # define SCM_MARK_BACKING_STORE() | |
1284 | #endif | |
1285 | ||
6087fad9 | 1286 | |
5f05c406 | 1287 | |
d823b11b MV |
1288 | /*** Select */ |
1289 | ||
911782b7 | 1290 | int |
9de87eea MV |
1291 | scm_std_select (int nfds, |
1292 | SELECT_TYPE *readfds, | |
1293 | SELECT_TYPE *writefds, | |
1294 | SELECT_TYPE *exceptfds, | |
1295 | struct timeval *timeout) | |
1296 | { | |
1297 | fd_set my_readfds; | |
1298 | int res, eno, wakeup_fd; | |
1299 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1300 | scm_t_guile_ticket ticket; | |
1301 | ||
1302 | if (readfds == NULL) | |
1303 | { | |
1304 | FD_ZERO (&my_readfds); | |
1305 | readfds = &my_readfds; | |
1306 | } | |
1307 | ||
1308 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1309 | SCM_TICK; | |
1310 | ||
1311 | wakeup_fd = t->sleep_pipe[0]; | |
1312 | ticket = scm_leave_guile (); | |
1313 | FD_SET (wakeup_fd, readfds); | |
1314 | if (wakeup_fd >= nfds) | |
1315 | nfds = wakeup_fd+1; | |
1316 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1317 | t->sleep_fd = -1; | |
d823b11b | 1318 | eno = errno; |
9de87eea MV |
1319 | scm_enter_guile (ticket); |
1320 | ||
1321 | scm_i_reset_sleep (t); | |
1322 | ||
1323 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1324 | { | |
1325 | char dummy; | |
1326 | read (wakeup_fd, &dummy, 1); | |
1327 | FD_CLR (wakeup_fd, readfds); | |
1328 | res -= 1; | |
1329 | if (res == 0) | |
1330 | { | |
1331 | eno = EINTR; | |
1332 | res = -1; | |
1333 | } | |
1334 | } | |
d823b11b MV |
1335 | errno = eno; |
1336 | return res; | |
5f05c406 MV |
1337 | } |
1338 | ||
9de87eea | 1339 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1340 | |
9de87eea | 1341 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1342 | |
9bc4701c | 1343 | int |
9de87eea | 1344 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1345 | { |
9de87eea MV |
1346 | scm_t_guile_ticket t = scm_leave_guile (); |
1347 | int res = scm_i_pthread_mutex_lock (mutex); | |
1348 | scm_enter_guile (t); | |
9bc4701c MD |
1349 | return res; |
1350 | } | |
1351 | ||
9de87eea | 1352 | static void |
2b829bbb | 1353 | do_unlock (void *data) |
28d52ebb | 1354 | { |
9de87eea | 1355 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1356 | } |
1357 | ||
1358 | void | |
661ae7ab | 1359 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1360 | { |
9de87eea | 1361 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1362 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1363 | } |
1364 | ||
9bc4701c | 1365 | int |
9de87eea | 1366 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1367 | { |
9de87eea MV |
1368 | scm_t_guile_ticket t = scm_leave_guile (); |
1369 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1370 | scm_enter_guile (t); | |
9bc4701c MD |
1371 | return res; |
1372 | } | |
9bc4701c | 1373 | |
76da80e7 | 1374 | int |
9de87eea MV |
1375 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1376 | scm_i_pthread_mutex_t *mutex, | |
1377 | const scm_t_timespec *wt) | |
76da80e7 | 1378 | { |
9de87eea MV |
1379 | scm_t_guile_ticket t = scm_leave_guile (); |
1380 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1381 | scm_enter_guile (t); | |
1382 | return res; | |
76da80e7 MV |
1383 | } |
1384 | ||
9de87eea | 1385 | #endif |
76da80e7 | 1386 | |
d823b11b | 1387 | unsigned long |
9de87eea | 1388 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1389 | { |
d823b11b MV |
1390 | struct timeval tv; |
1391 | tv.tv_usec = usecs % 1000000; | |
1392 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1393 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1394 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1395 | } |
1396 | ||
9de87eea MV |
1397 | unsigned int |
1398 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1399 | { |
d823b11b MV |
1400 | struct timeval tv; |
1401 | tv.tv_usec = 0; | |
1402 | tv.tv_sec = secs; | |
9de87eea | 1403 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1404 | return tv.tv_sec; |
6c214b62 MD |
1405 | } |
1406 | ||
d823b11b MV |
1407 | /*** Misc */ |
1408 | ||
1409 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1410 | (void), | |
1411 | "Return the thread that called this function.") | |
1412 | #define FUNC_NAME s_scm_current_thread | |
1413 | { | |
9de87eea | 1414 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1415 | } |
1416 | #undef FUNC_NAME | |
1417 | ||
9de87eea MV |
1418 | static SCM |
1419 | scm_c_make_list (size_t n, SCM fill) | |
1420 | { | |
1421 | SCM res = SCM_EOL; | |
1422 | while (n-- > 0) | |
1423 | res = scm_cons (fill, res); | |
1424 | return res; | |
1425 | } | |
1426 | ||
d823b11b MV |
1427 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1428 | (void), | |
1429 | "Return a list of all threads.") | |
9bc4701c | 1430 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1431 | { |
9de87eea MV |
1432 | /* We can not allocate while holding the thread_admin_mutex because |
1433 | of the way GC is done. | |
1434 | */ | |
1435 | int n = thread_count; | |
1436 | scm_i_thread *t; | |
1437 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1438 | |
9de87eea MV |
1439 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1440 | l = &list; | |
1441 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1442 | { | |
1443 | SCM_SETCAR (*l, t->handle); | |
1444 | l = SCM_CDRLOC (*l); | |
1445 | n--; | |
1446 | } | |
1447 | *l = SCM_EOL; | |
1448 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1449 | return list; | |
d823b11b | 1450 | } |
9de87eea | 1451 | #undef FUNC_NAME |
d823b11b MV |
1452 | |
1453 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1454 | (SCM thread), | |
1455 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1456 | #define FUNC_NAME s_scm_thread_exited_p | |
1457 | { | |
7888309b | 1458 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1459 | } |
1460 | #undef FUNC_NAME | |
1461 | ||
911782b7 | 1462 | int |
d823b11b MV |
1463 | scm_c_thread_exited_p (SCM thread) |
1464 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1465 | { |
9de87eea | 1466 | scm_i_thread *t; |
d823b11b | 1467 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1468 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1469 | return t->exited; |
5f05c406 | 1470 | } |
d823b11b | 1471 | #undef FUNC_NAME |
5f05c406 | 1472 | |
9de87eea | 1473 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1474 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1475 | static int threads_initialized_p = 0; |
1476 | ||
1477 | void | |
1478 | scm_i_thread_put_to_sleep () | |
1479 | { | |
6087fad9 | 1480 | if (threads_initialized_p) |
9bc4701c | 1481 | { |
9de87eea | 1482 | scm_i_thread *t; |
6087fad9 | 1483 | |
9de87eea MV |
1484 | scm_leave_guile (); |
1485 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1486 | ||
0c97d7dd MV |
1487 | /* Signal all threads to go to sleep |
1488 | */ | |
1489 | scm_i_thread_go_to_sleep = 1; | |
1490 | for (t = all_threads; t; t = t->next_thread) | |
1491 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1492 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1493 | } |
1494 | } | |
1495 | ||
b0dc3d71 MD |
1496 | void |
1497 | scm_i_thread_invalidate_freelists () | |
1498 | { | |
9de87eea MV |
1499 | /* thread_admin_mutex is already locked. */ |
1500 | ||
1501 | scm_i_thread *t; | |
1502 | for (t = all_threads; t; t = t->next_thread) | |
1503 | if (t != SCM_I_CURRENT_THREAD) | |
1504 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1505 | } |
1506 | ||
9bc4701c MD |
1507 | void |
1508 | scm_i_thread_wake_up () | |
1509 | { | |
6087fad9 | 1510 | if (threads_initialized_p) |
9bc4701c | 1511 | { |
9de87eea | 1512 | scm_i_thread *t; |
9de87eea | 1513 | |
0c97d7dd MV |
1514 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1515 | for (t = all_threads; t; t = t->next_thread) | |
1516 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1517 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1518 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1519 | } |
9bc4701c MD |
1520 | } |
1521 | ||
1522 | void | |
1523 | scm_i_thread_sleep_for_gc () | |
1524 | { | |
9de87eea MV |
1525 | scm_i_thread *t = suspend (); |
1526 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1527 | resume (t); |
9bc4701c MD |
1528 | } |
1529 | ||
a4d106c7 MV |
1530 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1531 | */ | |
d1138028 | 1532 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1533 | int scm_i_critical_section_level = 0; |
1534 | ||
661ae7ab | 1535 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1536 | |
9bc4701c | 1537 | void |
661ae7ab | 1538 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1539 | { |
a4d106c7 | 1540 | if (scm_is_false (mutex)) |
661ae7ab MV |
1541 | mutex = dynwind_critical_section_mutex; |
1542 | scm_dynwind_lock_mutex (mutex); | |
1543 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1544 | } |
1545 | ||
1546 | /*** Initialization */ | |
1547 | ||
1548 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1549 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1550 | ||
d1138028 MV |
1551 | #if SCM_USE_PTHREAD_THREADS |
1552 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1553 | #endif | |
1554 | ||
9de87eea MV |
1555 | void |
1556 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1557 | { | |
d1138028 MV |
1558 | #if SCM_USE_PTHREAD_THREADS |
1559 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1560 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1561 | PTHREAD_MUTEX_RECURSIVE); | |
1562 | #endif | |
1563 | ||
1564 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1565 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1566 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1567 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1568 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1569 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1570 | ||
1571 | guilify_self_1 (base); | |
9bc4701c MD |
1572 | } |
1573 | ||
d823b11b MV |
1574 | scm_t_bits scm_tc16_thread; |
1575 | scm_t_bits scm_tc16_mutex; | |
1576 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 1577 | |
7bfd3b9e | 1578 | void |
9de87eea | 1579 | scm_init_threads () |
7bfd3b9e | 1580 | { |
9de87eea | 1581 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 1582 | scm_set_smob_print (scm_tc16_thread, thread_print); |
a4a141f6 | 1583 | scm_set_smob_free (scm_tc16_thread, thread_free); /* XXX: Could be removed */ |
d823b11b | 1584 | |
9de87eea | 1585 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
1586 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
1587 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 1588 | |
9de87eea MV |
1589 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
1590 | sizeof (fat_cond)); | |
9de87eea MV |
1591 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
1592 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 1593 | |
9de87eea MV |
1594 | scm_i_default_dynamic_state = SCM_BOOL_F; |
1595 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 1596 | threads_initialized_p = 1; |
a4d106c7 | 1597 | |
661ae7ab | 1598 | dynwind_critical_section_mutex = |
a4d106c7 | 1599 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 1600 | } |
89e00824 | 1601 | |
5f05c406 | 1602 | void |
9de87eea | 1603 | scm_init_threads_default_dynamic_state () |
5f05c406 | 1604 | { |
9de87eea MV |
1605 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
1606 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
1607 | } |
1608 | ||
d823b11b | 1609 | void |
9de87eea | 1610 | scm_init_thread_procs () |
d823b11b | 1611 | { |
9de87eea | 1612 | #include "libguile/threads.x" |
d823b11b MV |
1613 | } |
1614 | ||
89e00824 ML |
1615 | /* |
1616 | Local Variables: | |
1617 | c-file-style: "gnu" | |
1618 | End: | |
1619 | */ |