Commit | Line | Data |
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86a597f8 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
7bfd3b9e | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
73be1d9e MV |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
7bfd3b9e | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
7bfd3b9e JB |
19 | \f |
20 | ||
9de87eea | 21 | #define _GNU_SOURCE |
76da80e7 | 22 | |
1810dc4e RB |
23 | #include "libguile/_scm.h" |
24 | ||
fcc5d734 | 25 | #if HAVE_UNISTD_H |
d823b11b | 26 | #include <unistd.h> |
fcc5d734 | 27 | #endif |
d823b11b MV |
28 | #include <stdio.h> |
29 | #include <assert.h> | |
8ab3d8a0 KR |
30 | |
31 | #ifdef HAVE_STRING_H | |
32 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
33 | #endif | |
34 | ||
fcc5d734 | 35 | #if HAVE_SYS_TIME_H |
d823b11b | 36 | #include <sys/time.h> |
fcc5d734 | 37 | #endif |
5f05c406 | 38 | |
d823b11b MV |
39 | #include "libguile/validate.h" |
40 | #include "libguile/root.h" | |
41 | #include "libguile/eval.h" | |
42 | #include "libguile/async.h" | |
43 | #include "libguile/ports.h" | |
44 | #include "libguile/threads.h" | |
a0599745 | 45 | #include "libguile/dynwind.h" |
d823b11b | 46 | #include "libguile/iselect.h" |
9de87eea MV |
47 | #include "libguile/fluids.h" |
48 | #include "libguile/continuations.h" | |
2b829bbb | 49 | #include "libguile/gc.h" |
9de87eea | 50 | #include "libguile/init.h" |
2e77f720 | 51 | #include "libguile/scmsigs.h" |
6180e336 | 52 | #include "libguile/strings.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 | ||
6180e336 NJ |
63 | static void |
64 | to_timespec (SCM t, scm_t_timespec *waittime) | |
65 | { | |
66 | if (scm_is_pair (t)) | |
67 | { | |
68 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
69 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
70 | } | |
71 | else | |
72 | { | |
73 | double time = scm_to_double (t); | |
74 | double sec = scm_c_truncate (time); | |
75 | ||
76 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 77 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
78 | } |
79 | } | |
80 | ||
d823b11b | 81 | /*** Queues */ |
7bfd3b9e | 82 | |
9de87eea MV |
83 | /* Make an empty queue data structure. |
84 | */ | |
d823b11b MV |
85 | static SCM |
86 | make_queue () | |
87 | { | |
88 | return scm_cons (SCM_EOL, SCM_EOL); | |
89 | } | |
7bfd3b9e | 90 | |
9de87eea MV |
91 | /* Put T at the back of Q and return a handle that can be used with |
92 | remqueue to remove T from Q again. | |
93 | */ | |
d823b11b MV |
94 | static SCM |
95 | enqueue (SCM q, SCM t) | |
96 | { | |
97 | SCM c = scm_cons (t, SCM_EOL); | |
d2e53ed6 | 98 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
99 | SCM_SETCDR (q, c); |
100 | else | |
101 | SCM_SETCDR (SCM_CAR (q), c); | |
102 | SCM_SETCAR (q, c); | |
103 | return c; | |
104 | } | |
7bfd3b9e | 105 | |
9de87eea MV |
106 | /* Remove the element that the handle C refers to from the queue Q. C |
107 | must have been returned from a call to enqueue. The return value | |
108 | is zero when the element referred to by C has already been removed. | |
109 | Otherwise, 1 is returned. | |
110 | */ | |
111 | static int | |
d823b11b MV |
112 | remqueue (SCM q, SCM c) |
113 | { | |
114 | SCM p, prev = q; | |
d2e53ed6 | 115 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 116 | { |
bc36d050 | 117 | if (scm_is_eq (p, c)) |
d823b11b | 118 | { |
bc36d050 | 119 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
120 | SCM_SETCAR (q, SCM_CDR (c)); |
121 | SCM_SETCDR (prev, SCM_CDR (c)); | |
9de87eea | 122 | return 1; |
d823b11b MV |
123 | } |
124 | prev = p; | |
125 | } | |
9de87eea | 126 | return 0; |
d823b11b MV |
127 | } |
128 | ||
9de87eea MV |
129 | /* Remove the front-most element from the queue Q and return it. |
130 | Return SCM_BOOL_F when Q is empty. | |
131 | */ | |
d823b11b MV |
132 | static SCM |
133 | dequeue (SCM q) | |
134 | { | |
135 | SCM c = SCM_CDR (q); | |
d2e53ed6 | 136 | if (scm_is_null (c)) |
d823b11b MV |
137 | return SCM_BOOL_F; |
138 | else | |
139 | { | |
140 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 141 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
142 | SCM_SETCAR (q, SCM_EOL); |
143 | return SCM_CAR (c); | |
144 | } | |
145 | } | |
7bfd3b9e | 146 | |
9de87eea | 147 | /*** Thread smob routines */ |
76da80e7 | 148 | |
d823b11b MV |
149 | static SCM |
150 | thread_mark (SCM obj) | |
151 | { | |
9de87eea | 152 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
d823b11b | 153 | scm_gc_mark (t->result); |
2e77f720 | 154 | scm_gc_mark (t->cleanup_handler); |
9de87eea | 155 | scm_gc_mark (t->join_queue); |
6180e336 | 156 | scm_gc_mark (t->mutexes); |
9de87eea MV |
157 | scm_gc_mark (t->dynwinds); |
158 | scm_gc_mark (t->active_asyncs); | |
9de87eea MV |
159 | scm_gc_mark (t->continuation_root); |
160 | return t->dynamic_state; | |
d823b11b MV |
161 | } |
162 | ||
163 | static int | |
164 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
165 | { | |
23d72566 KR |
166 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
167 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
168 | the struct case, hence we go via a union, and extract according to the | |
169 | size of pthread_t. */ | |
170 | union { | |
171 | scm_i_pthread_t p; | |
172 | unsigned short us; | |
173 | unsigned int ui; | |
174 | unsigned long ul; | |
175 | scm_t_uintmax um; | |
176 | } u; | |
9de87eea | 177 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
178 | scm_i_pthread_t p = t->pthread; |
179 | scm_t_uintmax id; | |
180 | u.p = p; | |
181 | if (sizeof (p) == sizeof (unsigned short)) | |
182 | id = u.us; | |
183 | else if (sizeof (p) == sizeof (unsigned int)) | |
184 | id = u.ui; | |
185 | else if (sizeof (p) == sizeof (unsigned long)) | |
186 | id = u.ul; | |
187 | else | |
188 | id = u.um; | |
189 | ||
d823b11b | 190 | scm_puts ("#<thread ", port); |
23d72566 | 191 | scm_uintprint (id, 10, port); |
1b92fb6b | 192 | scm_puts (" (", port); |
0345e278 | 193 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 194 | scm_puts (")>", port); |
d823b11b MV |
195 | return 1; |
196 | } | |
197 | ||
198 | static size_t | |
199 | thread_free (SCM obj) | |
200 | { | |
9de87eea MV |
201 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
202 | assert (t->exited); | |
d823b11b MV |
203 | scm_gc_free (t, sizeof (*t), "thread"); |
204 | return 0; | |
205 | } | |
206 | ||
9de87eea | 207 | /*** Blocking on queues. */ |
f7eca35d | 208 | |
9de87eea MV |
209 | /* See also scm_i_queue_async_cell for how such a block is |
210 | interrputed. | |
211 | */ | |
d823b11b | 212 | |
9de87eea MV |
213 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
214 | be woken up by a call to 'unblock_from_queue', or to be | |
215 | interrupted. Upon return of this function, the current thread is | |
216 | no longer on QUEUE, even when the sleep has been interrupted. | |
217 | ||
218 | The QUEUE data structure is assumed to be protected by MUTEX and | |
219 | the caller of block_self must hold MUTEX. It will be atomically | |
220 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. | |
221 | ||
222 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
223 | as MUTEX is needed. | |
224 | ||
225 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
226 | ||
227 | The return value of block_self is an errno value. It will be zero | |
228 | when the sleep has been successfully completed by a call to | |
229 | unblock_from_queue, EINTR when it has been interrupted by the | |
230 | delivery of a system async, and ETIMEDOUT when the timeout has | |
231 | expired. | |
232 | ||
233 | The system asyncs themselves are not executed by block_self. | |
234 | */ | |
235 | static int | |
236 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
237 | const scm_t_timespec *waittime) | |
76da80e7 | 238 | { |
9de87eea MV |
239 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
240 | SCM q_handle; | |
241 | int err; | |
242 | ||
243 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
244 | err = EINTR; | |
245 | else | |
246 | { | |
247 | t->block_asyncs++; | |
248 | q_handle = enqueue (queue, t->handle); | |
249 | if (waittime == NULL) | |
250 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
251 | else | |
252 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
253 | ||
254 | /* When we are still on QUEUE, we have been interrupted. We | |
255 | report this only when no other error (such as a timeout) has | |
256 | happened above. | |
257 | */ | |
258 | if (remqueue (queue, q_handle) && err == 0) | |
259 | err = EINTR; | |
260 | t->block_asyncs--; | |
261 | scm_i_reset_sleep (t); | |
262 | } | |
263 | ||
264 | return err; | |
76da80e7 | 265 | } |
9de87eea MV |
266 | |
267 | /* Wake up the first thread on QUEUE, if any. The caller must hold | |
268 | the mutex that protects QUEUE. The awoken thread is returned, or | |
269 | #f when the queue was empty. | |
270 | */ | |
271 | static SCM | |
272 | unblock_from_queue (SCM queue) | |
273 | { | |
274 | SCM thread = dequeue (queue); | |
275 | if (scm_is_true (thread)) | |
276 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
277 | return thread; | |
278 | } | |
279 | ||
280 | /* Getting into and out of guile mode. | |
281 | */ | |
282 | ||
98648121 MV |
283 | /* Ken Raeburn observes that the implementation of suspend and resume |
284 | (and the things that build on top of them) are very likely not | |
285 | correct (see below). We will need fix this eventually, and that's | |
286 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
287 | ||
288 | Ken writes: | |
289 | ||
290 | Consider this sequence: | |
291 | ||
292 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
293 | through scm_leave_guile), which does this: | |
294 | ||
295 | // record top of stack for the GC | |
296 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
297 | var 't' | |
298 | // save registers. | |
299 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
300 | setjmp (t->regs); // here's most of the magic | |
301 | ||
302 | ... and returns. | |
303 | ||
304 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
305 | a caller-saved register R, and it's the only reference to the object | |
306 | currently. | |
307 | ||
308 | The compiler wants to use R in suspend, so it pushes the current | |
309 | value, X, into a stack slot which will be reloaded on exit from | |
310 | suspend; then it loads stuff into R and goes about its business. The | |
311 | setjmp call saves (some of) the current registers, including R, which | |
312 | no longer contains X. (This isn't a problem for a normal | |
313 | setjmp/longjmp situation, where longjmp would be called before | |
314 | setjmp's caller returns; the old value for X would be loaded back from | |
315 | the stack after the longjmp, before the function returned.) | |
316 | ||
317 | So, suspend returns, loading X back into R (and invalidating the jump | |
318 | buffer) in the process. The caller foo then goes off and calls a | |
319 | bunch of other functions out of Guile mode, occasionally storing X on | |
320 | the stack again, but, say, much deeper on the stack than suspend's | |
321 | stack frame went, and the stack slot where suspend had written X has | |
322 | long since been overwritten with other values. | |
323 | ||
324 | Okay, nothing actively broken so far. Now, let garbage collection | |
325 | run, triggered by another thread. | |
326 | ||
327 | The thread calling foo is out of Guile mode at the time, so the | |
328 | garbage collector just scans a range of stack addresses. Too bad that | |
329 | X isn't stored there. So the pointed-to storage goes onto the free | |
330 | list, and I think you can see where things go from there. | |
331 | ||
332 | Is there anything I'm missing that'll prevent this scenario from | |
333 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
334 | don't have many local variables, so they probably won't need to save | |
335 | any registers on most systems, so we hope everything will wind up in | |
336 | the jump buffer and we'll just get away with it"? | |
337 | ||
338 | (And, going the other direction, if scm_leave_guile and suspend push | |
339 | the stack pointer over onto a new page, and foo doesn't make further | |
340 | function calls and thus the stack pointer no longer includes that | |
341 | page, are we guaranteed that the kernel cannot release the now-unused | |
342 | stack page that contains the top-of-stack pointer we just saved? I | |
343 | don't know if any OS actually does that. If it does, we could get | |
344 | faults in garbage collection.) | |
345 | ||
346 | I don't think scm_without_guile has to have this problem, as it gets | |
347 | more control over the stack handling -- but it should call setjmp | |
348 | itself. I'd probably try something like: | |
349 | ||
350 | // record top of stack for the GC | |
351 | t->top = SCM_STACK_PTR (&t); | |
352 | // save registers. | |
353 | SCM_FLUSH_REGISTER_WINDOWS; | |
354 | setjmp (t->regs); | |
355 | res = func(data); | |
356 | scm_enter_guile (t); | |
357 | ||
358 | ... though even that's making some assumptions about the stack | |
359 | ordering of local variables versus caller-saved registers. | |
360 | ||
361 | For something like scm_leave_guile to work, I don't think it can just | |
362 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
363 | on the stack state at the point when the jump buffer was initialized, | |
364 | together, would work fine, but I think then we're talking about macros | |
365 | invoking setjmp in the caller's stack frame, and requiring that the | |
366 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
367 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
368 | in a function. (In fact, the pthread ones have to be paired up | |
369 | syntactically, as if they might expand to a compound statement | |
370 | incorporating the user's code, and invoking a compiler's | |
371 | exception-handling primitives. Which might be something to think | |
372 | about for cases where Guile is used with C++ exceptions or | |
373 | pthread_cancel.) | |
374 | */ | |
375 | ||
9de87eea MV |
376 | scm_i_pthread_key_t scm_i_thread_key; |
377 | ||
d823b11b | 378 | static void |
9de87eea | 379 | resume (scm_i_thread *t) |
d823b11b | 380 | { |
d823b11b | 381 | t->top = NULL; |
9bc4701c MD |
382 | if (t->clear_freelists_p) |
383 | { | |
384 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
385 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
386 | t->clear_freelists_p = 0; | |
387 | } | |
d823b11b MV |
388 | } |
389 | ||
98648121 MV |
390 | typedef void* scm_t_guile_ticket; |
391 | ||
392 | static void | |
9de87eea | 393 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 394 | { |
9de87eea MV |
395 | scm_i_thread *t = (scm_i_thread *)ticket; |
396 | if (t) | |
397 | { | |
398 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
399 | resume (t); | |
400 | } | |
d823b11b MV |
401 | } |
402 | ||
9de87eea MV |
403 | static scm_i_thread * |
404 | suspend (void) | |
d823b11b | 405 | { |
9de87eea | 406 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
407 | |
408 | /* record top of stack for the GC */ | |
9de87eea | 409 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
410 | /* save registers. */ |
411 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
412 | setjmp (t->regs); |
413 | return t; | |
d823b11b MV |
414 | } |
415 | ||
98648121 | 416 | static scm_t_guile_ticket |
9de87eea | 417 | scm_leave_guile () |
d823b11b | 418 | { |
9de87eea MV |
419 | scm_i_thread *t = suspend (); |
420 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
421 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
422 | } |
423 | ||
9de87eea MV |
424 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
425 | static scm_i_thread *all_threads = NULL; | |
426 | static int thread_count; | |
427 | ||
428 | static SCM scm_i_default_dynamic_state; | |
429 | ||
430 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 431 | */ |
9de87eea MV |
432 | static void |
433 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 434 | { |
9de87eea MV |
435 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
436 | ||
437 | t->pthread = scm_i_pthread_self (); | |
438 | t->handle = SCM_BOOL_F; | |
439 | t->result = SCM_BOOL_F; | |
2e77f720 | 440 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 441 | t->mutexes = SCM_EOL; |
9de87eea MV |
442 | t->join_queue = SCM_EOL; |
443 | t->dynamic_state = SCM_BOOL_F; | |
444 | t->dynwinds = SCM_EOL; | |
445 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
446 | t->block_asyncs = 1; |
447 | t->pending_asyncs = 1; | |
448 | t->last_debug_frame = NULL; | |
449 | t->base = base; | |
346e4402 NJ |
450 | #ifdef __ia64__ |
451 | /* Calculate and store off the base of this thread's register | |
452 | backing store (RBS). Unfortunately our implementation(s) of | |
453 | scm_ia64_register_backing_store_base are only reliable for the | |
454 | main thread. For other threads, therefore, find out the current | |
455 | top of the RBS, and use that as a maximum. */ | |
456 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
457 | { | |
458 | ucontext_t ctx; | |
459 | void *bsp; | |
460 | getcontext (&ctx); | |
461 | bsp = scm_ia64_ar_bsp (&ctx); | |
462 | if (t->register_backing_store_base > bsp) | |
463 | t->register_backing_store_base = bsp; | |
464 | } | |
465 | #endif | |
0c97d7dd | 466 | t->continuation_root = SCM_EOL; |
9de87eea MV |
467 | t->continuation_base = base; |
468 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
469 | t->sleep_mutex = NULL; | |
470 | t->sleep_object = SCM_BOOL_F; | |
471 | t->sleep_fd = -1; | |
0c97d7dd | 472 | /* XXX - check for errors. */ |
9de87eea MV |
473 | pipe (t->sleep_pipe); |
474 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
86a597f8 | 475 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
9de87eea | 476 | t->clear_freelists_p = 0; |
1a8fdd7e | 477 | t->gc_running_p = 0; |
2e77f720 | 478 | t->canceled = 0; |
9de87eea MV |
479 | t->exited = 0; |
480 | ||
481 | t->freelist = SCM_EOL; | |
482 | t->freelist2 = SCM_EOL; | |
483 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
484 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
485 | ||
486 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
487 | ||
488 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
489 | ||
490 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
491 | t->next_thread = all_threads; | |
492 | all_threads = t; | |
493 | thread_count++; | |
494 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
495 | } |
496 | ||
9de87eea | 497 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 498 | */ |
9de87eea MV |
499 | static void |
500 | guilify_self_2 (SCM parent) | |
d823b11b | 501 | { |
9de87eea MV |
502 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
503 | ||
504 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
505 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
506 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
507 | t->continuation_base = t->base; | |
508 | ||
509 | if (scm_is_true (parent)) | |
510 | t->dynamic_state = scm_make_dynamic_state (parent); | |
511 | else | |
512 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
513 | ||
514 | t->join_queue = make_queue (); | |
515 | t->block_asyncs = 0; | |
d823b11b MV |
516 | } |
517 | ||
6180e336 NJ |
518 | \f |
519 | /*** Fat mutexes */ | |
520 | ||
521 | /* We implement our own mutex type since we want them to be 'fair', we | |
522 | want to do fancy things while waiting for them (like running | |
523 | asyncs) and we might want to add things that are nice for | |
524 | debugging. | |
525 | */ | |
526 | ||
527 | typedef struct { | |
528 | scm_i_pthread_mutex_t lock; | |
529 | SCM owner; | |
530 | int level; /* how much the owner owns us. | |
531 | < 0 for non-recursive mutexes */ | |
532 | ||
533 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ | |
534 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
535 | owned by the current thread? */ | |
536 | ||
537 | SCM waiting; /* the threads waiting for this mutex. */ | |
538 | } fat_mutex; | |
539 | ||
540 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
541 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
542 | ||
9de87eea | 543 | /* Perform thread tear-down, in guile mode. |
d823b11b | 544 | */ |
9de87eea MV |
545 | static void * |
546 | do_thread_exit (void *v) | |
547 | { | |
2e77f720 LC |
548 | scm_i_thread *t = (scm_i_thread *) v; |
549 | ||
550 | if (!scm_is_false (t->cleanup_handler)) | |
551 | { | |
552 | SCM ptr = t->cleanup_handler; | |
553 | ||
554 | t->cleanup_handler = SCM_BOOL_F; | |
555 | t->result = scm_internal_catch (SCM_BOOL_T, | |
556 | (scm_t_catch_body) scm_call_0, ptr, | |
557 | scm_handle_by_message_noexit, NULL); | |
558 | } | |
9de87eea | 559 | |
86a597f8 | 560 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
561 | |
562 | t->exited = 1; | |
0c97d7dd MV |
563 | close (t->sleep_pipe[0]); |
564 | close (t->sleep_pipe[1]); | |
9de87eea MV |
565 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
566 | ; | |
9de87eea | 567 | |
6180e336 NJ |
568 | while (!scm_is_null (t->mutexes)) |
569 | { | |
570 | SCM mutex = SCM_CAR (t->mutexes); | |
571 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
572 | scm_i_pthread_mutex_lock (&m->lock); | |
573 | ||
574 | unblock_from_queue (m->waiting); | |
575 | ||
576 | scm_i_pthread_mutex_unlock (&m->lock); | |
577 | t->mutexes = SCM_CDR (t->mutexes); | |
578 | } | |
579 | ||
86a597f8 | 580 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 581 | |
9de87eea MV |
582 | return NULL; |
583 | } | |
584 | ||
d823b11b | 585 | static void |
9de87eea | 586 | on_thread_exit (void *v) |
d823b11b | 587 | { |
29776e85 | 588 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 589 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 590 | |
9de87eea | 591 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 592 | |
2e77f720 LC |
593 | /* Ensure the signal handling thread has been launched, because we might be |
594 | shutting it down. */ | |
595 | scm_i_ensure_signal_delivery_thread (); | |
596 | ||
0c97d7dd | 597 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 598 | since the queue is a SCM data structure. */ |
9de87eea | 599 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
600 | |
601 | /* Removing ourself from the list of all threads needs to happen in | |
602 | non-guile mode since all SCM values on our stack become | |
29776e85 | 603 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
604 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
605 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
606 | if (*tp == t) | |
607 | { | |
608 | *tp = t->next_thread; | |
609 | break; | |
610 | } | |
611 | thread_count--; | |
2e77f720 LC |
612 | |
613 | /* If there's only one other thread, it could be the signal delivery | |
614 | thread, so we need to notify it to shut down by closing its read pipe. | |
615 | If it's not the signal delivery thread, then closing the read pipe isn't | |
616 | going to hurt. */ | |
617 | if (thread_count <= 1) | |
618 | scm_i_close_signal_pipe (); | |
619 | ||
0c97d7dd MV |
620 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
621 | ||
9de87eea | 622 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
623 | } |
624 | ||
9de87eea | 625 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 626 | |
9de87eea MV |
627 | static void |
628 | init_thread_key (void) | |
629 | { | |
630 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
631 | } | |
d823b11b | 632 | |
9de87eea MV |
633 | /* Perform any initializations necessary to bring the current thread |
634 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 635 | |
9de87eea MV |
636 | BASE is the stack base to use with GC. |
637 | ||
638 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
639 | which case the default dynamic state is used. | |
640 | ||
641 | Return zero when the thread was in guile mode already; otherwise | |
642 | return 1. | |
643 | */ | |
644 | ||
645 | static int | |
646 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 647 | { |
9de87eea MV |
648 | scm_i_thread *t; |
649 | ||
650 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
651 | ||
652 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
653 | { | |
654 | /* This thread has not been guilified yet. | |
655 | */ | |
656 | ||
657 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
658 | if (scm_initialized_p == 0) | |
659 | { | |
660 | /* First thread ever to enter Guile. Run the full | |
661 | initialization. | |
662 | */ | |
663 | scm_i_init_guile (base); | |
664 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
665 | } | |
666 | else | |
667 | { | |
668 | /* Guile is already initialized, but this thread enters it for | |
669 | the first time. Only initialize this thread. | |
670 | */ | |
671 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
672 | guilify_self_1 (base); | |
673 | guilify_self_2 (parent); | |
674 | } | |
675 | return 1; | |
676 | } | |
677 | else if (t->top) | |
678 | { | |
679 | /* This thread is already guilified but not in guile mode, just | |
680 | resume it. | |
681 | ||
682 | XXX - base might be lower than when this thread was first | |
683 | guilified. | |
684 | */ | |
685 | scm_enter_guile ((scm_t_guile_ticket) t); | |
686 | return 1; | |
687 | } | |
688 | else | |
689 | { | |
690 | /* Thread is already in guile mode. Nothing to do. | |
691 | */ | |
692 | return 0; | |
693 | } | |
d823b11b MV |
694 | } |
695 | ||
9de87eea | 696 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 697 | |
23d72566 KR |
698 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
699 | /* This method for GNU/Linux and perhaps some other systems. | |
700 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
701 | available on them. */ | |
9de87eea MV |
702 | #define HAVE_GET_THREAD_STACK_BASE |
703 | ||
704 | static SCM_STACKITEM * | |
705 | get_thread_stack_base () | |
d823b11b | 706 | { |
9de87eea MV |
707 | pthread_attr_t attr; |
708 | void *start, *end; | |
709 | size_t size; | |
710 | ||
9de87eea MV |
711 | pthread_getattr_np (pthread_self (), &attr); |
712 | pthread_attr_getstack (&attr, &start, &size); | |
713 | end = (char *)start + size; | |
714 | ||
2b829bbb KR |
715 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
716 | for the main thread, but we can use scm_get_stack_base in that | |
717 | case. | |
718 | */ | |
719 | ||
720 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 721 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 722 | return scm_get_stack_base (); |
9de87eea | 723 | else |
2b829bbb | 724 | #endif |
9de87eea MV |
725 | { |
726 | #if SCM_STACK_GROWS_UP | |
727 | return start; | |
728 | #else | |
729 | return end; | |
730 | #endif | |
731 | } | |
a54a94b3 MV |
732 | } |
733 | ||
23d72566 KR |
734 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
735 | /* This method for MacOS X. | |
736 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
737 | but as of 2006 there's nothing obvious at apple.com. */ | |
738 | #define HAVE_GET_THREAD_STACK_BASE | |
739 | static SCM_STACKITEM * | |
740 | get_thread_stack_base () | |
741 | { | |
742 | return pthread_get_stackaddr_np (pthread_self ()); | |
743 | } | |
744 | ||
745 | #elif defined (__MINGW32__) | |
746 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
747 | in any thread. We don't like hard-coding the name of a system, but there | |
748 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
749 | work. */ | |
750 | #define HAVE_GET_THREAD_STACK_BASE | |
751 | static SCM_STACKITEM * | |
752 | get_thread_stack_base () | |
753 | { | |
754 | return scm_get_stack_base (); | |
755 | } | |
756 | ||
757 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
758 | |
759 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
760 | ||
761 | #define HAVE_GET_THREAD_STACK_BASE | |
762 | ||
763 | static SCM_STACKITEM * | |
764 | get_thread_stack_base () | |
a54a94b3 | 765 | { |
2b829bbb | 766 | return scm_get_stack_base (); |
d823b11b MV |
767 | } |
768 | ||
9de87eea | 769 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
770 | |
771 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
772 | ||
773 | void | |
774 | scm_init_guile () | |
d823b11b | 775 | { |
9de87eea MV |
776 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
777 | scm_i_default_dynamic_state); | |
d823b11b MV |
778 | } |
779 | ||
9de87eea MV |
780 | #endif |
781 | ||
782 | void * | |
783 | scm_with_guile (void *(*func)(void *), void *data) | |
784 | { | |
785 | return scm_i_with_guile_and_parent (func, data, | |
786 | scm_i_default_dynamic_state); | |
787 | } | |
788 | ||
2e77f720 LC |
789 | static void |
790 | scm_leave_guile_cleanup (void *x) | |
791 | { | |
792 | scm_leave_guile (); | |
793 | } | |
794 | ||
9de87eea | 795 | void * |
2e77f720 | 796 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
797 | { |
798 | void *res; | |
799 | int really_entered; | |
800 | SCM_STACKITEM base_item; | |
2e77f720 | 801 | |
9de87eea | 802 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 803 | if (really_entered) |
2e77f720 LC |
804 | { |
805 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
806 | res = scm_c_with_continuation_barrier (func, data); | |
807 | scm_i_pthread_cleanup_pop (0); | |
808 | scm_leave_guile (); | |
809 | } | |
810 | else | |
811 | res = scm_c_with_continuation_barrier (func, data); | |
812 | ||
9de87eea MV |
813 | return res; |
814 | } | |
815 | ||
816 | void * | |
817 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 818 | { |
9de87eea MV |
819 | void *res; |
820 | scm_t_guile_ticket t; | |
821 | t = scm_leave_guile (); | |
822 | res = func (data); | |
823 | scm_enter_guile (t); | |
824 | return res; | |
825 | } | |
826 | ||
827 | /*** Thread creation */ | |
828 | ||
829 | typedef struct { | |
830 | SCM parent; | |
831 | SCM thunk; | |
832 | SCM handler; | |
76da80e7 | 833 | SCM thread; |
9de87eea MV |
834 | scm_i_pthread_mutex_t mutex; |
835 | scm_i_pthread_cond_t cond; | |
836 | } launch_data; | |
d823b11b | 837 | |
9de87eea MV |
838 | static void * |
839 | really_launch (void *d) | |
840 | { | |
841 | launch_data *data = (launch_data *)d; | |
842 | SCM thunk = data->thunk, handler = data->handler; | |
843 | scm_i_thread *t; | |
d823b11b | 844 | |
9de87eea | 845 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 846 | |
9de87eea MV |
847 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
848 | data->thread = scm_current_thread (); | |
849 | scm_i_pthread_cond_signal (&data->cond); | |
850 | scm_i_pthread_mutex_unlock (&data->mutex); | |
851 | ||
852 | if (SCM_UNBNDP (handler)) | |
853 | t->result = scm_call_0 (thunk); | |
854 | else | |
855 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
856 | ||
857 | return 0; | |
d823b11b MV |
858 | } |
859 | ||
9de87eea MV |
860 | static void * |
861 | launch_thread (void *d) | |
862 | { | |
863 | launch_data *data = (launch_data *)d; | |
864 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
865 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
866 | return NULL; | |
867 | } | |
868 | ||
869 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 870 | (SCM thunk, SCM handler), |
9de87eea MV |
871 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
872 | "returning a new thread object representing the thread. The procedure\n" | |
873 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
874 | "\n" | |
875 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
876 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
877 | "handler. This catch is established inside the continuation barrier.\n" | |
878 | "\n" | |
879 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
880 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
881 | #define FUNC_NAME s_scm_call_with_new_thread |
882 | { | |
9de87eea MV |
883 | launch_data data; |
884 | scm_i_pthread_t id; | |
885 | int err; | |
d823b11b | 886 | |
9de87eea MV |
887 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
888 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
889 | handler, SCM_ARG2, FUNC_NAME); | |
890 | ||
891 | data.parent = scm_current_dynamic_state (); | |
892 | data.thunk = thunk; | |
893 | data.handler = handler; | |
894 | data.thread = SCM_BOOL_F; | |
895 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
896 | scm_i_pthread_cond_init (&data.cond, NULL); | |
897 | ||
898 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
899 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
900 | if (err) | |
901 | { | |
902 | scm_i_pthread_mutex_unlock (&data.mutex); | |
903 | errno = err; | |
904 | scm_syserror (NULL); | |
905 | } | |
906 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
907 | scm_i_pthread_mutex_unlock (&data.mutex); | |
908 | ||
909 | return data.thread; | |
d823b11b MV |
910 | } |
911 | #undef FUNC_NAME | |
912 | ||
9de87eea MV |
913 | typedef struct { |
914 | SCM parent; | |
915 | scm_t_catch_body body; | |
916 | void *body_data; | |
917 | scm_t_catch_handler handler; | |
918 | void *handler_data; | |
919 | SCM thread; | |
920 | scm_i_pthread_mutex_t mutex; | |
921 | scm_i_pthread_cond_t cond; | |
922 | } spawn_data; | |
923 | ||
924 | static void * | |
925 | really_spawn (void *d) | |
926 | { | |
927 | spawn_data *data = (spawn_data *)d; | |
928 | scm_t_catch_body body = data->body; | |
929 | void *body_data = data->body_data; | |
930 | scm_t_catch_handler handler = data->handler; | |
931 | void *handler_data = data->handler_data; | |
932 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
933 | ||
934 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
935 | data->thread = scm_current_thread (); | |
936 | scm_i_pthread_cond_signal (&data->cond); | |
937 | scm_i_pthread_mutex_unlock (&data->mutex); | |
938 | ||
939 | if (handler == NULL) | |
940 | t->result = body (body_data); | |
941 | else | |
942 | t->result = scm_internal_catch (SCM_BOOL_T, | |
943 | body, body_data, | |
944 | handler, handler_data); | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | static void * | |
950 | spawn_thread (void *d) | |
951 | { | |
952 | spawn_data *data = (spawn_data *)d; | |
953 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
954 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
955 | return NULL; | |
956 | } | |
957 | ||
958 | SCM | |
959 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
960 | scm_t_catch_handler handler, void *handler_data) | |
961 | { | |
962 | spawn_data data; | |
963 | scm_i_pthread_t id; | |
964 | int err; | |
965 | ||
966 | data.parent = scm_current_dynamic_state (); | |
967 | data.body = body; | |
968 | data.body_data = body_data; | |
969 | data.handler = handler; | |
970 | data.handler_data = handler_data; | |
971 | data.thread = SCM_BOOL_F; | |
972 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
973 | scm_i_pthread_cond_init (&data.cond, NULL); | |
974 | ||
975 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
976 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
977 | if (err) | |
978 | { | |
979 | scm_i_pthread_mutex_unlock (&data.mutex); | |
980 | errno = err; | |
981 | scm_syserror (NULL); | |
982 | } | |
983 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
984 | scm_i_pthread_mutex_unlock (&data.mutex); | |
985 | ||
986 | return data.thread; | |
987 | } | |
988 | ||
29717c89 MD |
989 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
990 | (), | |
991 | "Move the calling thread to the end of the scheduling queue.") | |
992 | #define FUNC_NAME s_scm_yield | |
993 | { | |
9de87eea | 994 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
995 | } |
996 | #undef FUNC_NAME | |
997 | ||
2e77f720 LC |
998 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
999 | (SCM thread), | |
1000 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1001 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1002 | "been signaled to terminate, this function is a no-op.") | |
1003 | #define FUNC_NAME s_scm_cancel_thread | |
1004 | { | |
1005 | scm_i_thread *t = NULL; | |
1006 | ||
1007 | SCM_VALIDATE_THREAD (1, thread); | |
1008 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1009 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1010 | if (!t->canceled) |
1011 | { | |
1012 | t->canceled = 1; | |
86a597f8 | 1013 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1014 | scm_i_pthread_cancel (t->pthread); |
1015 | } | |
1016 | else | |
86a597f8 | 1017 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1018 | |
1019 | return SCM_UNSPECIFIED; | |
1020 | } | |
1021 | #undef FUNC_NAME | |
1022 | ||
1023 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1024 | (SCM thread, SCM proc), | |
1025 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1026 | "This handler will be called when the thread exits.") | |
1027 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1028 | { | |
1029 | scm_i_thread *t; | |
1030 | ||
1031 | SCM_VALIDATE_THREAD (1, thread); | |
1032 | if (!scm_is_false (proc)) | |
1033 | SCM_VALIDATE_THUNK (2, proc); | |
1034 | ||
2e77f720 | 1035 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1036 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1037 | ||
2e77f720 LC |
1038 | if (!(t->exited || t->canceled)) |
1039 | t->cleanup_handler = proc; | |
1040 | ||
86a597f8 | 1041 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1042 | |
1043 | return SCM_UNSPECIFIED; | |
1044 | } | |
1045 | #undef FUNC_NAME | |
1046 | ||
1047 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1048 | (SCM thread), | |
1049 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1050 | #define FUNC_NAME s_scm_thread_cleanup | |
1051 | { | |
1052 | scm_i_thread *t; | |
1053 | SCM ret; | |
1054 | ||
1055 | SCM_VALIDATE_THREAD (1, thread); | |
1056 | ||
2e77f720 | 1057 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1058 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1059 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1060 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1061 | |
1062 | return ret; | |
1063 | } | |
1064 | #undef FUNC_NAME | |
1065 | ||
6180e336 NJ |
1066 | SCM scm_join_thread (SCM thread) |
1067 | { | |
1068 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1069 | } | |
1070 | ||
1071 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1072 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1073 | "Suspend execution of the calling thread until the target @var{thread} " |
1074 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1075 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1076 | { |
9de87eea | 1077 | scm_i_thread *t; |
6180e336 NJ |
1078 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1079 | SCM res = SCM_BOOL_F; | |
1080 | ||
1081 | if (! (SCM_UNBNDP (timeoutval))) | |
1082 | res = timeoutval; | |
d823b11b MV |
1083 | |
1084 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1085 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1086 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1087 | |
9de87eea | 1088 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1089 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1090 | ||
6180e336 NJ |
1091 | if (! SCM_UNBNDP (timeout)) |
1092 | { | |
1093 | to_timespec (timeout, &ctimeout); | |
1094 | timeout_ptr = &ctimeout; | |
1095 | } | |
1096 | ||
1097 | if (t->exited) | |
1098 | res = t->result; | |
1099 | else | |
d823b11b | 1100 | { |
9de87eea MV |
1101 | while (1) |
1102 | { | |
6180e336 NJ |
1103 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
1104 | timeout_ptr); | |
1105 | if (err == 0) | |
1106 | { | |
1107 | if (t->exited) | |
1108 | { | |
1109 | res = t->result; | |
1110 | break; | |
1111 | } | |
1112 | } | |
1113 | else if (err == ETIMEDOUT) | |
9de87eea | 1114 | break; |
6180e336 | 1115 | |
86a597f8 | 1116 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1117 | SCM_TICK; |
86a597f8 | 1118 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea | 1119 | } |
d823b11b | 1120 | } |
9de87eea | 1121 | |
86a597f8 | 1122 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1123 | |
d823b11b | 1124 | return res; |
5f05c406 MV |
1125 | } |
1126 | #undef FUNC_NAME | |
1127 | ||
6180e336 NJ |
1128 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1129 | (SCM obj), | |
1130 | "Return @code{#t} if @var{obj} is a thread.") | |
1131 | #define FUNC_NAME s_scm_thread_p | |
1132 | { | |
1133 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1134 | } | |
1135 | #undef FUNC_NAME | |
5f05c406 | 1136 | |
d823b11b | 1137 | static SCM |
9de87eea | 1138 | fat_mutex_mark (SCM mx) |
d823b11b | 1139 | { |
9de87eea | 1140 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
1141 | scm_gc_mark (m->owner); |
1142 | return m->waiting; | |
1143 | } | |
4079f87e | 1144 | |
9de87eea MV |
1145 | static size_t |
1146 | fat_mutex_free (SCM mx) | |
76da80e7 | 1147 | { |
9de87eea MV |
1148 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1149 | scm_i_pthread_mutex_destroy (&m->lock); | |
1150 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1151 | return 0; |
1152 | } | |
1153 | ||
1154 | static int | |
9de87eea | 1155 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1156 | { |
9de87eea MV |
1157 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1158 | scm_puts ("#<mutex ", port); | |
1159 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1160 | scm_puts (">", port); | |
1161 | return 1; | |
76da80e7 MV |
1162 | } |
1163 | ||
76da80e7 | 1164 | static SCM |
6180e336 | 1165 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1166 | { |
9de87eea MV |
1167 | fat_mutex *m; |
1168 | SCM mx; | |
1169 | ||
1170 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1171 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1172 | m->owner = SCM_BOOL_F; | |
1173 | m->level = recursive? 0 : -1; | |
6180e336 NJ |
1174 | |
1175 | m->unchecked_unlock = unchecked_unlock; | |
1176 | m->allow_external_unlock = external_unlock; | |
1177 | ||
9de87eea MV |
1178 | m->waiting = SCM_EOL; |
1179 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1180 | m->waiting = make_queue (); | |
1181 | return mx; | |
76da80e7 MV |
1182 | } |
1183 | ||
6180e336 NJ |
1184 | SCM scm_make_mutex (void) |
1185 | { | |
1186 | return scm_make_mutex_with_flags (SCM_EOL); | |
1187 | } | |
1188 | ||
2a1d0688 NJ |
1189 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1190 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1191 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1192 | |
1193 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1194 | (SCM flags), | |
9de87eea | 1195 | "Create a new mutex. ") |
6180e336 | 1196 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1197 | { |
6180e336 NJ |
1198 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1199 | ||
1200 | SCM ptr = flags; | |
1201 | while (! scm_is_null (ptr)) | |
1202 | { | |
1203 | SCM flag = SCM_CAR (ptr); | |
1204 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1205 | unchecked_unlock = 1; | |
1206 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1207 | external_unlock = 1; | |
1208 | else if (scm_is_eq (flag, recursive_sym)) | |
1209 | recursive = 1; | |
1210 | else | |
2a1d0688 | 1211 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1212 | ptr = SCM_CDR (ptr); |
1213 | } | |
1214 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1215 | } |
1216 | #undef FUNC_NAME | |
1217 | ||
9de87eea | 1218 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1219 | (void), |
9de87eea MV |
1220 | "Create a new recursive mutex. ") |
1221 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1222 | { |
6180e336 | 1223 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1224 | } |
1225 | #undef FUNC_NAME | |
1226 | ||
6180e336 NJ |
1227 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1228 | ||
1229 | static SCM | |
1230 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, int *ret) | |
9de87eea MV |
1231 | { |
1232 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1233 | |
9de87eea | 1234 | SCM thread = scm_current_thread (); |
6180e336 NJ |
1235 | scm_i_thread *t = SCM_I_THREAD_DATA (thread); |
1236 | ||
1237 | SCM err = SCM_BOOL_F; | |
1238 | ||
1239 | struct timeval current_time; | |
9de87eea MV |
1240 | |
1241 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1242 | if (scm_is_false (m->owner)) | |
6180e336 NJ |
1243 | { |
1244 | m->owner = thread; | |
1245 | scm_i_pthread_mutex_lock (&t->admin_mutex); | |
1246 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1247 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
1248 | *ret = 1; | |
1249 | } | |
9de87eea MV |
1250 | else if (scm_is_eq (m->owner, thread)) |
1251 | { | |
1252 | if (m->level >= 0) | |
6180e336 NJ |
1253 | { |
1254 | m->level++; | |
1255 | *ret = 1; | |
1256 | } | |
9de87eea | 1257 | else |
6180e336 NJ |
1258 | err = scm_cons (scm_misc_error_key, |
1259 | scm_from_locale_string ("mutex already locked by " | |
1260 | "current thread")); | |
9de87eea MV |
1261 | } |
1262 | else | |
1263 | { | |
6180e336 | 1264 | int first_iteration = 1; |
9de87eea MV |
1265 | while (1) |
1266 | { | |
6180e336 NJ |
1267 | if (scm_is_eq (m->owner, thread) || scm_c_thread_exited_p (m->owner)) |
1268 | { | |
1269 | scm_i_pthread_mutex_lock (&t->admin_mutex); | |
1270 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1271 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
1272 | *ret = 1; | |
1273 | if (scm_c_thread_exited_p (m->owner)) | |
1274 | { | |
1275 | m->owner = thread; | |
1276 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1277 | scm_from_locale_string ("lock obtained on " | |
1278 | "abandoned mutex")); | |
1279 | } | |
1280 | break; | |
1281 | } | |
1282 | else if (!first_iteration) | |
1283 | { | |
1284 | if (timeout != NULL) | |
1285 | { | |
1286 | gettimeofday (¤t_time, NULL); | |
1287 | if (current_time.tv_sec > timeout->tv_sec || | |
1288 | (current_time.tv_sec == timeout->tv_sec && | |
1289 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
1290 | { | |
1291 | *ret = 0; | |
1292 | break; | |
1293 | } | |
1294 | } | |
1295 | scm_i_pthread_mutex_unlock (&m->lock); | |
1296 | SCM_TICK; | |
1297 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1298 | } | |
1299 | else | |
1300 | first_iteration = 0; | |
1301 | block_self (m->waiting, mutex, &m->lock, timeout); | |
9de87eea MV |
1302 | } |
1303 | } | |
1304 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1305 | return err; |
9de87eea MV |
1306 | } |
1307 | ||
6180e336 NJ |
1308 | SCM scm_lock_mutex (SCM mx) |
1309 | { | |
1310 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED); | |
1311 | } | |
1312 | ||
1313 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 1, 0, | |
1314 | (SCM m, SCM timeout), | |
9bc4701c MD |
1315 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1316 | "blocks until the mutex becomes available. The function returns when " | |
1317 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1318 | "a thread already owns will succeed right away and will not block the " | |
1319 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1320 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1321 | { |
6180e336 NJ |
1322 | SCM exception; |
1323 | int ret = 0; | |
1324 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1325 | |
6180e336 NJ |
1326 | SCM_VALIDATE_MUTEX (1, m); |
1327 | ||
1328 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1329 | { | |
1330 | to_timespec (timeout, &cwaittime); | |
1331 | waittime = &cwaittime; | |
1332 | } | |
1333 | ||
1334 | exception = fat_mutex_lock (m, waittime, &ret); | |
1335 | if (!scm_is_false (exception)) | |
1336 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1337 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1338 | } |
76da80e7 | 1339 | #undef FUNC_NAME |
9bc4701c | 1340 | |
a4d106c7 | 1341 | void |
661ae7ab | 1342 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1343 | { |
661ae7ab MV |
1344 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1345 | SCM_F_WIND_EXPLICITLY); | |
1346 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1347 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1348 | } |
1349 | ||
9bc4701c | 1350 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1351 | (SCM mutex), |
9bc4701c MD |
1352 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1353 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1354 | #define FUNC_NAME s_scm_try_mutex | |
1355 | { | |
6180e336 NJ |
1356 | SCM exception; |
1357 | int ret = 0; | |
1358 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1359 | |
ba1b7223 | 1360 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1361 | |
1362 | to_timespec (scm_from_int(0), &cwaittime); | |
1363 | waittime = &cwaittime; | |
9bc4701c | 1364 | |
6180e336 NJ |
1365 | exception = fat_mutex_lock (mutex, waittime, &ret); |
1366 | if (!scm_is_false (exception)) | |
1367 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1368 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1369 | } |
1370 | #undef FUNC_NAME | |
76da80e7 | 1371 | |
6180e336 NJ |
1372 | /*** Fat condition variables */ |
1373 | ||
1374 | typedef struct { | |
1375 | scm_i_pthread_mutex_t lock; | |
1376 | SCM waiting; /* the threads waiting for this condition. */ | |
1377 | } fat_cond; | |
1378 | ||
1379 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1380 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1381 | ||
1382 | static int | |
1383 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1384 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1385 | { |
6180e336 NJ |
1386 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1387 | fat_cond *c = NULL; | |
1388 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1389 | int err = 0, ret = 0; | |
9de87eea MV |
1390 | |
1391 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1392 | if (!scm_is_eq (m->owner, scm_current_thread ())) | |
9bc4701c | 1393 | { |
9de87eea | 1394 | if (scm_is_false (m->owner)) |
6180e336 NJ |
1395 | { |
1396 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1397 | { |
1398 | scm_i_pthread_mutex_unlock (&m->lock); | |
1399 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1400 | } | |
6180e336 NJ |
1401 | } |
1402 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1403 | { |
1404 | scm_i_pthread_mutex_unlock (&m->lock); | |
1405 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1406 | } | |
6180e336 NJ |
1407 | } |
1408 | ||
1409 | if (! (SCM_UNBNDP (cond))) | |
1410 | { | |
1411 | int lock_ret = 0; | |
1412 | ||
1413 | c = SCM_CONDVAR_DATA (cond); | |
1414 | while (1) | |
1415 | { | |
1416 | int brk = 0; | |
1417 | ||
1418 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1419 | if (m->level > 0) | |
1420 | m->level--; | |
1421 | else | |
1422 | m->owner = unblock_from_queue (m->waiting); | |
1423 | scm_i_pthread_mutex_unlock (&m->lock); | |
1424 | ||
1425 | t->block_asyncs++; | |
1426 | ||
1427 | err = block_self (c->waiting, cond, &c->lock, waittime); | |
1428 | ||
1429 | if (err == 0) | |
1430 | { | |
1431 | ret = 1; | |
1432 | brk = 1; | |
1433 | } | |
1434 | else if (err == ETIMEDOUT) | |
1435 | { | |
1436 | ret = 0; | |
1437 | brk = 1; | |
1438 | } | |
1439 | else if (err != EINTR) | |
1440 | { | |
1441 | errno = err; | |
1442 | scm_i_pthread_mutex_unlock (&c->lock); | |
1443 | scm_syserror (NULL); | |
1444 | } | |
1445 | ||
1446 | if (brk) | |
1447 | { | |
1448 | if (relock) | |
1449 | fat_mutex_lock (mutex, NULL, &lock_ret); | |
1450 | scm_i_pthread_mutex_unlock (&c->lock); | |
1451 | break; | |
1452 | } | |
1453 | ||
1454 | scm_i_pthread_mutex_unlock (&c->lock); | |
1455 | ||
1456 | t->block_asyncs--; | |
1457 | scm_async_click (); | |
1458 | ||
1459 | scm_remember_upto_here_2 (cond, mutex); | |
1460 | ||
1461 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1462 | } | |
9bc4701c | 1463 | } |
9de87eea | 1464 | else |
6180e336 NJ |
1465 | { |
1466 | if (m->level > 0) | |
1467 | m->level--; | |
1468 | else | |
1469 | m->owner = unblock_from_queue (m->waiting); | |
1470 | scm_i_pthread_mutex_unlock (&m->lock); | |
1471 | ret = 1; | |
1472 | } | |
1473 | ||
1474 | return ret; | |
1475 | } | |
9de87eea | 1476 | |
6180e336 NJ |
1477 | SCM scm_unlock_mutex (SCM mx) |
1478 | { | |
1479 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1480 | } |
9bc4701c | 1481 | |
6180e336 NJ |
1482 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1483 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1484 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1485 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1486 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1487 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1488 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1489 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1490 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1491 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1492 | { |
6180e336 NJ |
1493 | scm_t_timespec cwaittime, *waittime = NULL; |
1494 | ||
9bc4701c | 1495 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1496 | if (! (SCM_UNBNDP (cond))) |
1497 | { | |
1498 | SCM_VALIDATE_CONDVAR (2, cond); | |
1499 | ||
1500 | if (! (SCM_UNBNDP (timeout))) | |
1501 | { | |
1502 | to_timespec (timeout, &cwaittime); | |
1503 | waittime = &cwaittime; | |
1504 | } | |
1505 | } | |
1506 | ||
1507 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1508 | } |
1509 | #undef FUNC_NAME | |
1510 | ||
6180e336 NJ |
1511 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1512 | (SCM obj), | |
1513 | "Return @code{#t} if @var{obj} is a mutex.") | |
1514 | #define FUNC_NAME s_scm_mutex_p | |
1515 | { | |
1516 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1517 | } | |
1518 | #undef FUNC_NAME | |
1519 | ||
9de87eea MV |
1520 | #if 0 |
1521 | ||
1522 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1523 | (SCM mx), | |
1524 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1525 | #define FUNC_NAME s_scm_mutex_owner | |
1526 | { | |
1527 | SCM_VALIDATE_MUTEX (1, mx); | |
1528 | return (SCM_MUTEX_DATA(mx))->owner; | |
1529 | } | |
1530 | #undef FUNC_NAME | |
1531 | ||
1532 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1533 | (SCM mx), | |
1534 | "Return the lock level of a recursive mutex, or -1\n" | |
1535 | "for a standard mutex.") | |
1536 | #define FUNC_NAME s_scm_mutex_level | |
1537 | { | |
1538 | SCM_VALIDATE_MUTEX (1, mx); | |
1539 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1540 | } | |
1541 | #undef FUNC_NAME | |
1542 | ||
1543 | #endif | |
1544 | ||
9de87eea MV |
1545 | static SCM |
1546 | fat_cond_mark (SCM cv) | |
1547 | { | |
1548 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1549 | return c->waiting; | |
1550 | } | |
1551 | ||
1552 | static size_t | |
1553 | fat_cond_free (SCM mx) | |
1554 | { | |
1555 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
1556 | scm_i_pthread_mutex_destroy (&c->lock); | |
1557 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | static int | |
1562 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1563 | { | |
1564 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1565 | scm_puts ("#<condition-variable ", port); | |
1566 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1567 | scm_puts (">", port); | |
1568 | return 1; | |
1569 | } | |
9bc4701c | 1570 | |
d823b11b MV |
1571 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1572 | (void), | |
1573 | "Make a new condition variable.") | |
1574 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1575 | { |
9de87eea MV |
1576 | fat_cond *c; |
1577 | SCM cv; | |
1578 | ||
1579 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
1580 | scm_i_pthread_mutex_init (&c->lock, 0); | |
1581 | c->waiting = SCM_EOL; | |
1582 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1583 | c->waiting = make_queue (); | |
d823b11b | 1584 | return cv; |
5f05c406 | 1585 | } |
d823b11b | 1586 | #undef FUNC_NAME |
5f05c406 | 1587 | |
d823b11b MV |
1588 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1589 | (SCM cv, SCM mx, SCM t), | |
1590 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1591 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1592 | "is locked again when this function returns. When @var{time} is given, " | |
1593 | "it specifies a point in time where the waiting should be aborted. It " | |
1594 | "can be either a integer as returned by @code{current-time} or a pair " | |
1595 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1596 | "mutex is locked and @code{#f} is returned. When the condition " | |
1597 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1598 | "is returned. ") | |
1599 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1600 | { |
9de87eea | 1601 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1602 | |
1603 | SCM_VALIDATE_CONDVAR (1, cv); | |
1604 | SCM_VALIDATE_MUTEX (2, mx); | |
9bc4701c | 1605 | |
d823b11b MV |
1606 | if (!SCM_UNBNDP (t)) |
1607 | { | |
6180e336 | 1608 | to_timespec (t, &waittime); |
9de87eea | 1609 | waitptr = &waittime; |
d823b11b MV |
1610 | } |
1611 | ||
2a1d0688 | 1612 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1613 | } |
d823b11b | 1614 | #undef FUNC_NAME |
5f05c406 | 1615 | |
9de87eea MV |
1616 | static void |
1617 | fat_cond_signal (fat_cond *c) | |
1618 | { | |
9de87eea MV |
1619 | scm_i_scm_pthread_mutex_lock (&c->lock); |
1620 | unblock_from_queue (c->waiting); | |
1621 | scm_i_pthread_mutex_unlock (&c->lock); | |
1622 | } | |
1623 | ||
d823b11b MV |
1624 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1625 | (SCM cv), | |
1626 | "Wake up one thread that is waiting for @var{cv}") | |
1627 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1628 | { |
d823b11b | 1629 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1630 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1631 | return SCM_BOOL_T; |
5f05c406 | 1632 | } |
d823b11b | 1633 | #undef FUNC_NAME |
5f05c406 | 1634 | |
9de87eea MV |
1635 | static void |
1636 | fat_cond_broadcast (fat_cond *c) | |
1637 | { | |
1638 | scm_i_scm_pthread_mutex_lock (&c->lock); | |
1639 | while (scm_is_true (unblock_from_queue (c->waiting))) | |
1640 | ; | |
1641 | scm_i_pthread_mutex_unlock (&c->lock); | |
1642 | } | |
1643 | ||
d823b11b MV |
1644 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1645 | (SCM cv), | |
1646 | "Wake up all threads that are waiting for @var{cv}. ") | |
1647 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1648 | { |
d823b11b | 1649 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1650 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1651 | return SCM_BOOL_T; |
5f05c406 | 1652 | } |
d823b11b | 1653 | #undef FUNC_NAME |
5f05c406 | 1654 | |
6180e336 NJ |
1655 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1656 | (SCM obj), | |
1657 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1658 | #define FUNC_NAME s_scm_condition_variable_p | |
1659 | { | |
1660 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1661 | } | |
1662 | #undef FUNC_NAME | |
1663 | ||
d823b11b MV |
1664 | /*** Marking stacks */ |
1665 | ||
1666 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1667 | threads as well? | |
1668 | */ | |
1669 | #ifdef __ia64__ | |
1670 | # define SCM_MARK_BACKING_STORE() do { \ | |
1671 | ucontext_t ctx; \ | |
1672 | SCM_STACKITEM * top, * bot; \ | |
1673 | getcontext (&ctx); \ | |
1674 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1675 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1676 | / sizeof (SCM_STACKITEM))); \ | |
346e4402 | 1677 | bot = (SCM_STACKITEM *) SCM_I_CURRENT_THREAD->register_backing_store_base; \ |
9a5fa6e9 | 1678 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ |
d823b11b MV |
1679 | scm_mark_locations (bot, top - bot); } while (0) |
1680 | #else | |
1681 | # define SCM_MARK_BACKING_STORE() | |
1682 | #endif | |
1683 | ||
1684 | void | |
1685 | scm_threads_mark_stacks (void) | |
5f05c406 | 1686 | { |
9de87eea MV |
1687 | scm_i_thread *t; |
1688 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1689 | { |
9de87eea MV |
1690 | /* Check that thread has indeed been suspended. |
1691 | */ | |
1692 | assert (t->top); | |
6087fad9 | 1693 | |
9de87eea | 1694 | scm_gc_mark (t->handle); |
6087fad9 | 1695 | |
d028af45 | 1696 | #if SCM_STACK_GROWS_UP |
9de87eea | 1697 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1698 | #else |
9de87eea | 1699 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1700 | #endif |
346e4402 | 1701 | scm_mark_locations ((SCM_STACKITEM *) &t->regs, |
6087fad9 MV |
1702 | ((size_t) sizeof(t->regs) |
1703 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1704 | } |
59152722 MV |
1705 | |
1706 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1707 | } |
1708 | ||
d823b11b MV |
1709 | /*** Select */ |
1710 | ||
911782b7 | 1711 | int |
9de87eea MV |
1712 | scm_std_select (int nfds, |
1713 | SELECT_TYPE *readfds, | |
1714 | SELECT_TYPE *writefds, | |
1715 | SELECT_TYPE *exceptfds, | |
1716 | struct timeval *timeout) | |
1717 | { | |
1718 | fd_set my_readfds; | |
1719 | int res, eno, wakeup_fd; | |
1720 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1721 | scm_t_guile_ticket ticket; | |
1722 | ||
1723 | if (readfds == NULL) | |
1724 | { | |
1725 | FD_ZERO (&my_readfds); | |
1726 | readfds = &my_readfds; | |
1727 | } | |
1728 | ||
1729 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1730 | SCM_TICK; | |
1731 | ||
1732 | wakeup_fd = t->sleep_pipe[0]; | |
1733 | ticket = scm_leave_guile (); | |
1734 | FD_SET (wakeup_fd, readfds); | |
1735 | if (wakeup_fd >= nfds) | |
1736 | nfds = wakeup_fd+1; | |
1737 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1738 | t->sleep_fd = -1; | |
d823b11b | 1739 | eno = errno; |
9de87eea MV |
1740 | scm_enter_guile (ticket); |
1741 | ||
1742 | scm_i_reset_sleep (t); | |
1743 | ||
1744 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1745 | { | |
1746 | char dummy; | |
1747 | read (wakeup_fd, &dummy, 1); | |
1748 | FD_CLR (wakeup_fd, readfds); | |
1749 | res -= 1; | |
1750 | if (res == 0) | |
1751 | { | |
1752 | eno = EINTR; | |
1753 | res = -1; | |
1754 | } | |
1755 | } | |
d823b11b MV |
1756 | errno = eno; |
1757 | return res; | |
5f05c406 MV |
1758 | } |
1759 | ||
9de87eea | 1760 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1761 | |
9de87eea | 1762 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1763 | |
9bc4701c | 1764 | int |
9de87eea | 1765 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1766 | { |
9de87eea MV |
1767 | scm_t_guile_ticket t = scm_leave_guile (); |
1768 | int res = scm_i_pthread_mutex_lock (mutex); | |
1769 | scm_enter_guile (t); | |
9bc4701c MD |
1770 | return res; |
1771 | } | |
1772 | ||
9de87eea | 1773 | static void |
2b829bbb | 1774 | do_unlock (void *data) |
28d52ebb | 1775 | { |
9de87eea | 1776 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1777 | } |
1778 | ||
1779 | void | |
661ae7ab | 1780 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1781 | { |
9de87eea | 1782 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1783 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1784 | } |
1785 | ||
9bc4701c | 1786 | int |
9de87eea | 1787 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1788 | { |
9de87eea MV |
1789 | scm_t_guile_ticket t = scm_leave_guile (); |
1790 | int res = scm_i_pthread_cond_wait (cond, mutex); | |
1791 | scm_enter_guile (t); | |
9bc4701c MD |
1792 | return res; |
1793 | } | |
9bc4701c | 1794 | |
76da80e7 | 1795 | int |
9de87eea MV |
1796 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1797 | scm_i_pthread_mutex_t *mutex, | |
1798 | const scm_t_timespec *wt) | |
76da80e7 | 1799 | { |
9de87eea MV |
1800 | scm_t_guile_ticket t = scm_leave_guile (); |
1801 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); | |
1802 | scm_enter_guile (t); | |
1803 | return res; | |
76da80e7 MV |
1804 | } |
1805 | ||
9de87eea | 1806 | #endif |
76da80e7 | 1807 | |
d823b11b | 1808 | unsigned long |
9de87eea | 1809 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1810 | { |
d823b11b MV |
1811 | struct timeval tv; |
1812 | tv.tv_usec = usecs % 1000000; | |
1813 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1814 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1815 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1816 | } |
1817 | ||
9de87eea MV |
1818 | unsigned int |
1819 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1820 | { |
d823b11b MV |
1821 | struct timeval tv; |
1822 | tv.tv_usec = 0; | |
1823 | tv.tv_sec = secs; | |
9de87eea | 1824 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1825 | return tv.tv_sec; |
6c214b62 MD |
1826 | } |
1827 | ||
d823b11b MV |
1828 | /*** Misc */ |
1829 | ||
1830 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1831 | (void), | |
1832 | "Return the thread that called this function.") | |
1833 | #define FUNC_NAME s_scm_current_thread | |
1834 | { | |
9de87eea | 1835 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1836 | } |
1837 | #undef FUNC_NAME | |
1838 | ||
9de87eea MV |
1839 | static SCM |
1840 | scm_c_make_list (size_t n, SCM fill) | |
1841 | { | |
1842 | SCM res = SCM_EOL; | |
1843 | while (n-- > 0) | |
1844 | res = scm_cons (fill, res); | |
1845 | return res; | |
1846 | } | |
1847 | ||
d823b11b MV |
1848 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1849 | (void), | |
1850 | "Return a list of all threads.") | |
9bc4701c | 1851 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1852 | { |
9de87eea MV |
1853 | /* We can not allocate while holding the thread_admin_mutex because |
1854 | of the way GC is done. | |
1855 | */ | |
1856 | int n = thread_count; | |
1857 | scm_i_thread *t; | |
1858 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1859 | |
9de87eea MV |
1860 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1861 | l = &list; | |
1862 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1863 | { | |
2e77f720 LC |
1864 | if (t != scm_i_signal_delivery_thread) |
1865 | { | |
1866 | SCM_SETCAR (*l, t->handle); | |
1867 | l = SCM_CDRLOC (*l); | |
1868 | } | |
9de87eea MV |
1869 | n--; |
1870 | } | |
1871 | *l = SCM_EOL; | |
1872 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1873 | return list; | |
d823b11b | 1874 | } |
9de87eea | 1875 | #undef FUNC_NAME |
d823b11b MV |
1876 | |
1877 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1878 | (SCM thread), | |
1879 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1880 | #define FUNC_NAME s_scm_thread_exited_p | |
1881 | { | |
7888309b | 1882 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1883 | } |
1884 | #undef FUNC_NAME | |
1885 | ||
911782b7 | 1886 | int |
d823b11b MV |
1887 | scm_c_thread_exited_p (SCM thread) |
1888 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1889 | { |
9de87eea | 1890 | scm_i_thread *t; |
d823b11b | 1891 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1892 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1893 | return t->exited; |
5f05c406 | 1894 | } |
d823b11b | 1895 | #undef FUNC_NAME |
5f05c406 | 1896 | |
9de87eea | 1897 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1898 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1899 | static int threads_initialized_p = 0; |
1900 | ||
1901 | void | |
1902 | scm_i_thread_put_to_sleep () | |
1903 | { | |
6087fad9 | 1904 | if (threads_initialized_p) |
9bc4701c | 1905 | { |
9de87eea | 1906 | scm_i_thread *t; |
6087fad9 | 1907 | |
9de87eea MV |
1908 | scm_leave_guile (); |
1909 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1910 | ||
0c97d7dd MV |
1911 | /* Signal all threads to go to sleep |
1912 | */ | |
1913 | scm_i_thread_go_to_sleep = 1; | |
1914 | for (t = all_threads; t; t = t->next_thread) | |
1915 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1916 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1917 | } |
1918 | } | |
1919 | ||
b0dc3d71 MD |
1920 | void |
1921 | scm_i_thread_invalidate_freelists () | |
1922 | { | |
9de87eea MV |
1923 | /* thread_admin_mutex is already locked. */ |
1924 | ||
1925 | scm_i_thread *t; | |
1926 | for (t = all_threads; t; t = t->next_thread) | |
1927 | if (t != SCM_I_CURRENT_THREAD) | |
1928 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1929 | } |
1930 | ||
9bc4701c MD |
1931 | void |
1932 | scm_i_thread_wake_up () | |
1933 | { | |
6087fad9 | 1934 | if (threads_initialized_p) |
9bc4701c | 1935 | { |
9de87eea | 1936 | scm_i_thread *t; |
9de87eea | 1937 | |
0c97d7dd MV |
1938 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1939 | for (t = all_threads; t; t = t->next_thread) | |
1940 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1941 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1942 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1943 | } |
9bc4701c MD |
1944 | } |
1945 | ||
1946 | void | |
1947 | scm_i_thread_sleep_for_gc () | |
1948 | { | |
9de87eea MV |
1949 | scm_i_thread *t = suspend (); |
1950 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); | |
b0dc3d71 | 1951 | resume (t); |
9bc4701c MD |
1952 | } |
1953 | ||
a4d106c7 MV |
1954 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1955 | */ | |
d1138028 | 1956 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1957 | int scm_i_critical_section_level = 0; |
1958 | ||
661ae7ab | 1959 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1960 | |
9bc4701c | 1961 | void |
661ae7ab | 1962 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1963 | { |
a4d106c7 | 1964 | if (scm_is_false (mutex)) |
661ae7ab MV |
1965 | mutex = dynwind_critical_section_mutex; |
1966 | scm_dynwind_lock_mutex (mutex); | |
1967 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1968 | } |
1969 | ||
1970 | /*** Initialization */ | |
1971 | ||
1972 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
1973 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
1974 | ||
d1138028 MV |
1975 | #if SCM_USE_PTHREAD_THREADS |
1976 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1977 | #endif | |
1978 | ||
9de87eea MV |
1979 | void |
1980 | scm_threads_prehistory (SCM_STACKITEM *base) | |
1981 | { | |
d1138028 MV |
1982 | #if SCM_USE_PTHREAD_THREADS |
1983 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
1984 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
1985 | PTHREAD_MUTEX_RECURSIVE); | |
1986 | #endif | |
1987 | ||
1988 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
1989 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
1990 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
1991 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
1992 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
1993 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
1994 | ||
1995 | guilify_self_1 (base); | |
9bc4701c MD |
1996 | } |
1997 | ||
d823b11b MV |
1998 | scm_t_bits scm_tc16_thread; |
1999 | scm_t_bits scm_tc16_mutex; | |
2000 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2001 | |
7bfd3b9e | 2002 | void |
9de87eea | 2003 | scm_init_threads () |
7bfd3b9e | 2004 | { |
9de87eea | 2005 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
2006 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
2007 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
2008 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
2009 | ||
9de87eea MV |
2010 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
2011 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
2012 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
2013 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2014 | |
9de87eea MV |
2015 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2016 | sizeof (fat_cond)); | |
2017 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
2018 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
2019 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 2020 | |
9de87eea MV |
2021 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2022 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2023 | threads_initialized_p = 1; |
a4d106c7 | 2024 | |
661ae7ab | 2025 | dynwind_critical_section_mutex = |
a4d106c7 | 2026 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 2027 | } |
89e00824 | 2028 | |
5f05c406 | 2029 | void |
9de87eea | 2030 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2031 | { |
9de87eea MV |
2032 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
2033 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
2034 | } |
2035 | ||
d823b11b | 2036 | void |
9de87eea | 2037 | scm_init_thread_procs () |
d823b11b | 2038 | { |
9de87eea | 2039 | #include "libguile/threads.x" |
d823b11b MV |
2040 | } |
2041 | ||
89e00824 ML |
2042 | /* |
2043 | Local Variables: | |
2044 | c-file-style: "gnu" | |
2045 | End: | |
2046 | */ |