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. |
74926120 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
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 | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
7bfd3b9e | 20 | \f |
dbb605f5 LC |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
7bfd3b9e | 24 | |
1810dc4e RB |
25 | #include "libguile/_scm.h" |
26 | ||
fcc5d734 | 27 | #if HAVE_UNISTD_H |
d823b11b | 28 | #include <unistd.h> |
fcc5d734 | 29 | #endif |
d823b11b MV |
30 | #include <stdio.h> |
31 | #include <assert.h> | |
8ab3d8a0 KR |
32 | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
35 | #endif | |
36 | ||
fcc5d734 | 37 | #if HAVE_SYS_TIME_H |
d823b11b | 38 | #include <sys/time.h> |
fcc5d734 | 39 | #endif |
5f05c406 | 40 | |
d823b11b MV |
41 | #include "libguile/validate.h" |
42 | #include "libguile/root.h" | |
43 | #include "libguile/eval.h" | |
44 | #include "libguile/async.h" | |
45 | #include "libguile/ports.h" | |
46 | #include "libguile/threads.h" | |
a0599745 | 47 | #include "libguile/dynwind.h" |
d823b11b | 48 | #include "libguile/iselect.h" |
9de87eea MV |
49 | #include "libguile/fluids.h" |
50 | #include "libguile/continuations.h" | |
2b829bbb | 51 | #include "libguile/gc.h" |
9de87eea | 52 | #include "libguile/init.h" |
2e77f720 | 53 | #include "libguile/scmsigs.h" |
6180e336 | 54 | #include "libguile/strings.h" |
7bfd3b9e | 55 | |
ecc9f40f MV |
56 | #ifdef __MINGW32__ |
57 | #ifndef ETIMEDOUT | |
58 | # define ETIMEDOUT WSAETIMEDOUT | |
59 | #endif | |
60 | # include <fcntl.h> | |
61 | # include <process.h> | |
62 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
63 | #endif /* __MINGW32__ */ | |
64 | ||
634aa8de LC |
65 | #include <full-read.h> |
66 | ||
67 | \f | |
6180e336 NJ |
68 | static void |
69 | to_timespec (SCM t, scm_t_timespec *waittime) | |
70 | { | |
71 | if (scm_is_pair (t)) | |
72 | { | |
73 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
74 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
75 | } | |
76 | else | |
77 | { | |
78 | double time = scm_to_double (t); | |
79 | double sec = scm_c_truncate (time); | |
80 | ||
81 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 82 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
83 | } |
84 | } | |
85 | ||
d823b11b | 86 | /*** Queues */ |
7bfd3b9e | 87 | |
9de87eea MV |
88 | /* Make an empty queue data structure. |
89 | */ | |
d823b11b MV |
90 | static SCM |
91 | make_queue () | |
92 | { | |
93 | return scm_cons (SCM_EOL, SCM_EOL); | |
94 | } | |
7bfd3b9e | 95 | |
9de87eea MV |
96 | /* Put T at the back of Q and return a handle that can be used with |
97 | remqueue to remove T from Q again. | |
98 | */ | |
d823b11b MV |
99 | static SCM |
100 | enqueue (SCM q, SCM t) | |
101 | { | |
102 | SCM c = scm_cons (t, SCM_EOL); | |
f9d44e84 | 103 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 104 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
105 | SCM_SETCDR (q, c); |
106 | else | |
107 | SCM_SETCDR (SCM_CAR (q), c); | |
108 | SCM_SETCAR (q, c); | |
f9d44e84 | 109 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
110 | return c; |
111 | } | |
7bfd3b9e | 112 | |
9de87eea MV |
113 | /* Remove the element that the handle C refers to from the queue Q. C |
114 | must have been returned from a call to enqueue. The return value | |
115 | is zero when the element referred to by C has already been removed. | |
116 | Otherwise, 1 is returned. | |
117 | */ | |
118 | static int | |
d823b11b MV |
119 | remqueue (SCM q, SCM c) |
120 | { | |
121 | SCM p, prev = q; | |
f9d44e84 | 122 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 123 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 124 | { |
bc36d050 | 125 | if (scm_is_eq (p, c)) |
d823b11b | 126 | { |
bc36d050 | 127 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
128 | SCM_SETCAR (q, SCM_CDR (c)); |
129 | SCM_SETCDR (prev, SCM_CDR (c)); | |
f9d44e84 | 130 | SCM_CRITICAL_SECTION_END; |
9de87eea | 131 | return 1; |
d823b11b MV |
132 | } |
133 | prev = p; | |
134 | } | |
f9d44e84 | 135 | SCM_CRITICAL_SECTION_END; |
9de87eea | 136 | return 0; |
d823b11b MV |
137 | } |
138 | ||
9de87eea MV |
139 | /* Remove the front-most element from the queue Q and return it. |
140 | Return SCM_BOOL_F when Q is empty. | |
141 | */ | |
d823b11b MV |
142 | static SCM |
143 | dequeue (SCM q) | |
144 | { | |
f9d44e84 NJ |
145 | SCM c; |
146 | SCM_CRITICAL_SECTION_START; | |
147 | c = SCM_CDR (q); | |
d2e53ed6 | 148 | if (scm_is_null (c)) |
f9d44e84 NJ |
149 | { |
150 | SCM_CRITICAL_SECTION_END; | |
151 | return SCM_BOOL_F; | |
152 | } | |
d823b11b MV |
153 | else |
154 | { | |
155 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 156 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 157 | SCM_SETCAR (q, SCM_EOL); |
f9d44e84 | 158 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
159 | return SCM_CAR (c); |
160 | } | |
161 | } | |
7bfd3b9e | 162 | |
9de87eea | 163 | /*** Thread smob routines */ |
76da80e7 | 164 | |
d823b11b MV |
165 | static SCM |
166 | thread_mark (SCM obj) | |
167 | { | |
9de87eea | 168 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
d823b11b | 169 | scm_gc_mark (t->result); |
2e77f720 | 170 | scm_gc_mark (t->cleanup_handler); |
9de87eea | 171 | scm_gc_mark (t->join_queue); |
6180e336 | 172 | scm_gc_mark (t->mutexes); |
9de87eea MV |
173 | scm_gc_mark (t->dynwinds); |
174 | scm_gc_mark (t->active_asyncs); | |
9de87eea | 175 | scm_gc_mark (t->continuation_root); |
2bbe1533 | 176 | scm_gc_mark (t->vm); |
9de87eea | 177 | return t->dynamic_state; |
d823b11b MV |
178 | } |
179 | ||
180 | static int | |
181 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
182 | { | |
23d72566 KR |
183 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
184 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
185 | the struct case, hence we go via a union, and extract according to the | |
186 | size of pthread_t. */ | |
187 | union { | |
188 | scm_i_pthread_t p; | |
189 | unsigned short us; | |
190 | unsigned int ui; | |
191 | unsigned long ul; | |
192 | scm_t_uintmax um; | |
193 | } u; | |
9de87eea | 194 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
195 | scm_i_pthread_t p = t->pthread; |
196 | scm_t_uintmax id; | |
197 | u.p = p; | |
198 | if (sizeof (p) == sizeof (unsigned short)) | |
199 | id = u.us; | |
200 | else if (sizeof (p) == sizeof (unsigned int)) | |
201 | id = u.ui; | |
202 | else if (sizeof (p) == sizeof (unsigned long)) | |
203 | id = u.ul; | |
204 | else | |
205 | id = u.um; | |
206 | ||
d823b11b | 207 | scm_puts ("#<thread ", port); |
23d72566 | 208 | scm_uintprint (id, 10, port); |
1b92fb6b | 209 | scm_puts (" (", port); |
0345e278 | 210 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 211 | scm_puts (")>", port); |
d823b11b MV |
212 | return 1; |
213 | } | |
214 | ||
215 | static size_t | |
216 | thread_free (SCM obj) | |
217 | { | |
9de87eea MV |
218 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
219 | assert (t->exited); | |
d823b11b MV |
220 | scm_gc_free (t, sizeof (*t), "thread"); |
221 | return 0; | |
222 | } | |
223 | ||
9de87eea | 224 | /*** Blocking on queues. */ |
f7eca35d | 225 | |
9de87eea MV |
226 | /* See also scm_i_queue_async_cell for how such a block is |
227 | interrputed. | |
228 | */ | |
d823b11b | 229 | |
9de87eea MV |
230 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
231 | be woken up by a call to 'unblock_from_queue', or to be | |
232 | interrupted. Upon return of this function, the current thread is | |
233 | no longer on QUEUE, even when the sleep has been interrupted. | |
234 | ||
f9d44e84 | 235 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
236 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
237 | ||
238 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
239 | as MUTEX is needed. | |
240 | ||
241 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
242 | ||
243 | The return value of block_self is an errno value. It will be zero | |
244 | when the sleep has been successfully completed by a call to | |
245 | unblock_from_queue, EINTR when it has been interrupted by the | |
246 | delivery of a system async, and ETIMEDOUT when the timeout has | |
247 | expired. | |
248 | ||
249 | The system asyncs themselves are not executed by block_self. | |
250 | */ | |
251 | static int | |
252 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
253 | const scm_t_timespec *waittime) | |
76da80e7 | 254 | { |
9de87eea MV |
255 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
256 | SCM q_handle; | |
257 | int err; | |
258 | ||
259 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
260 | err = EINTR; | |
261 | else | |
262 | { | |
263 | t->block_asyncs++; | |
264 | q_handle = enqueue (queue, t->handle); | |
265 | if (waittime == NULL) | |
266 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
267 | else | |
268 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
269 | ||
270 | /* When we are still on QUEUE, we have been interrupted. We | |
271 | report this only when no other error (such as a timeout) has | |
272 | happened above. | |
273 | */ | |
274 | if (remqueue (queue, q_handle) && err == 0) | |
275 | err = EINTR; | |
276 | t->block_asyncs--; | |
277 | scm_i_reset_sleep (t); | |
278 | } | |
279 | ||
280 | return err; | |
76da80e7 | 281 | } |
9de87eea | 282 | |
f9d44e84 NJ |
283 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
284 | returned, or #f if the queue was empty. | |
9de87eea MV |
285 | */ |
286 | static SCM | |
287 | unblock_from_queue (SCM queue) | |
288 | { | |
289 | SCM thread = dequeue (queue); | |
290 | if (scm_is_true (thread)) | |
291 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
292 | return thread; | |
293 | } | |
294 | ||
295 | /* Getting into and out of guile mode. | |
296 | */ | |
297 | ||
98648121 MV |
298 | /* Ken Raeburn observes that the implementation of suspend and resume |
299 | (and the things that build on top of them) are very likely not | |
300 | correct (see below). We will need fix this eventually, and that's | |
301 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
302 | ||
303 | Ken writes: | |
304 | ||
305 | Consider this sequence: | |
306 | ||
307 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
308 | through scm_leave_guile), which does this: | |
309 | ||
310 | // record top of stack for the GC | |
311 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
312 | var 't' | |
313 | // save registers. | |
314 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
a4dbe1ac | 315 | SCM_I_SETJMP (t->regs); // here's most of the magic |
98648121 MV |
316 | |
317 | ... and returns. | |
318 | ||
319 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
320 | a caller-saved register R, and it's the only reference to the object | |
321 | currently. | |
322 | ||
323 | The compiler wants to use R in suspend, so it pushes the current | |
324 | value, X, into a stack slot which will be reloaded on exit from | |
325 | suspend; then it loads stuff into R and goes about its business. The | |
326 | setjmp call saves (some of) the current registers, including R, which | |
327 | no longer contains X. (This isn't a problem for a normal | |
328 | setjmp/longjmp situation, where longjmp would be called before | |
329 | setjmp's caller returns; the old value for X would be loaded back from | |
330 | the stack after the longjmp, before the function returned.) | |
331 | ||
332 | So, suspend returns, loading X back into R (and invalidating the jump | |
333 | buffer) in the process. The caller foo then goes off and calls a | |
334 | bunch of other functions out of Guile mode, occasionally storing X on | |
335 | the stack again, but, say, much deeper on the stack than suspend's | |
336 | stack frame went, and the stack slot where suspend had written X has | |
337 | long since been overwritten with other values. | |
338 | ||
339 | Okay, nothing actively broken so far. Now, let garbage collection | |
340 | run, triggered by another thread. | |
341 | ||
342 | The thread calling foo is out of Guile mode at the time, so the | |
343 | garbage collector just scans a range of stack addresses. Too bad that | |
344 | X isn't stored there. So the pointed-to storage goes onto the free | |
345 | list, and I think you can see where things go from there. | |
346 | ||
347 | Is there anything I'm missing that'll prevent this scenario from | |
348 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
349 | don't have many local variables, so they probably won't need to save | |
350 | any registers on most systems, so we hope everything will wind up in | |
351 | the jump buffer and we'll just get away with it"? | |
352 | ||
353 | (And, going the other direction, if scm_leave_guile and suspend push | |
354 | the stack pointer over onto a new page, and foo doesn't make further | |
355 | function calls and thus the stack pointer no longer includes that | |
356 | page, are we guaranteed that the kernel cannot release the now-unused | |
357 | stack page that contains the top-of-stack pointer we just saved? I | |
358 | don't know if any OS actually does that. If it does, we could get | |
359 | faults in garbage collection.) | |
360 | ||
361 | I don't think scm_without_guile has to have this problem, as it gets | |
362 | more control over the stack handling -- but it should call setjmp | |
363 | itself. I'd probably try something like: | |
364 | ||
365 | // record top of stack for the GC | |
366 | t->top = SCM_STACK_PTR (&t); | |
367 | // save registers. | |
368 | SCM_FLUSH_REGISTER_WINDOWS; | |
a4dbe1ac | 369 | SCM_I_SETJMP (t->regs); |
98648121 MV |
370 | res = func(data); |
371 | scm_enter_guile (t); | |
372 | ||
373 | ... though even that's making some assumptions about the stack | |
374 | ordering of local variables versus caller-saved registers. | |
375 | ||
376 | For something like scm_leave_guile to work, I don't think it can just | |
377 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
378 | on the stack state at the point when the jump buffer was initialized, | |
379 | together, would work fine, but I think then we're talking about macros | |
380 | invoking setjmp in the caller's stack frame, and requiring that the | |
381 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
382 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
383 | in a function. (In fact, the pthread ones have to be paired up | |
384 | syntactically, as if they might expand to a compound statement | |
385 | incorporating the user's code, and invoking a compiler's | |
386 | exception-handling primitives. Which might be something to think | |
387 | about for cases where Guile is used with C++ exceptions or | |
388 | pthread_cancel.) | |
389 | */ | |
390 | ||
9de87eea MV |
391 | scm_i_pthread_key_t scm_i_thread_key; |
392 | ||
d823b11b | 393 | static void |
9de87eea | 394 | resume (scm_i_thread *t) |
d823b11b | 395 | { |
d823b11b | 396 | t->top = NULL; |
9bc4701c MD |
397 | if (t->clear_freelists_p) |
398 | { | |
399 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
400 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
401 | t->clear_freelists_p = 0; | |
402 | } | |
d823b11b MV |
403 | } |
404 | ||
98648121 MV |
405 | typedef void* scm_t_guile_ticket; |
406 | ||
407 | static void | |
9de87eea | 408 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 409 | { |
9de87eea MV |
410 | scm_i_thread *t = (scm_i_thread *)ticket; |
411 | if (t) | |
412 | { | |
413 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
8b0174c8 | 414 | t->heap_mutex_locked_by_self = 1; |
9de87eea MV |
415 | resume (t); |
416 | } | |
d823b11b MV |
417 | } |
418 | ||
9de87eea MV |
419 | static scm_i_thread * |
420 | suspend (void) | |
d823b11b | 421 | { |
9de87eea | 422 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
423 | |
424 | /* record top of stack for the GC */ | |
9de87eea | 425 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
426 | /* save registers. */ |
427 | SCM_FLUSH_REGISTER_WINDOWS; | |
a4dbe1ac | 428 | SCM_I_SETJMP (t->regs); |
9de87eea | 429 | return t; |
d823b11b MV |
430 | } |
431 | ||
98648121 | 432 | static scm_t_guile_ticket |
9de87eea | 433 | scm_leave_guile () |
d823b11b | 434 | { |
9de87eea | 435 | scm_i_thread *t = suspend (); |
8b0174c8 NJ |
436 | if (t->heap_mutex_locked_by_self) |
437 | { | |
438 | t->heap_mutex_locked_by_self = 0; | |
439 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
440 | } | |
9de87eea | 441 | return (scm_t_guile_ticket) t; |
d823b11b MV |
442 | } |
443 | ||
9de87eea MV |
444 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
445 | static scm_i_thread *all_threads = NULL; | |
446 | static int thread_count; | |
447 | ||
448 | static SCM scm_i_default_dynamic_state; | |
449 | ||
450 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 451 | */ |
9de87eea MV |
452 | static void |
453 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 454 | { |
9de87eea MV |
455 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
456 | ||
457 | t->pthread = scm_i_pthread_self (); | |
458 | t->handle = SCM_BOOL_F; | |
459 | t->result = SCM_BOOL_F; | |
2e77f720 | 460 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 461 | t->mutexes = SCM_EOL; |
f9d44e84 | 462 | t->held_mutex = NULL; |
9de87eea MV |
463 | t->join_queue = SCM_EOL; |
464 | t->dynamic_state = SCM_BOOL_F; | |
465 | t->dynwinds = SCM_EOL; | |
466 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
467 | t->block_asyncs = 1; |
468 | t->pending_asyncs = 1; | |
469 | t->last_debug_frame = NULL; | |
470 | t->base = base; | |
346e4402 NJ |
471 | #ifdef __ia64__ |
472 | /* Calculate and store off the base of this thread's register | |
473 | backing store (RBS). Unfortunately our implementation(s) of | |
474 | scm_ia64_register_backing_store_base are only reliable for the | |
475 | main thread. For other threads, therefore, find out the current | |
476 | top of the RBS, and use that as a maximum. */ | |
477 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
478 | { | |
479 | ucontext_t ctx; | |
480 | void *bsp; | |
481 | getcontext (&ctx); | |
482 | bsp = scm_ia64_ar_bsp (&ctx); | |
483 | if (t->register_backing_store_base > bsp) | |
484 | t->register_backing_store_base = bsp; | |
485 | } | |
486 | #endif | |
0c97d7dd | 487 | t->continuation_root = SCM_EOL; |
9de87eea MV |
488 | t->continuation_base = base; |
489 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
490 | t->sleep_mutex = NULL; | |
491 | t->sleep_object = SCM_BOOL_F; | |
492 | t->sleep_fd = -1; | |
634aa8de LC |
493 | |
494 | if (pipe (t->sleep_pipe) != 0) | |
495 | /* FIXME: Error conditions during the initialization phase are handled | |
496 | gracelessly since public functions such as `scm_init_guile ()' | |
497 | currently have type `void'. */ | |
498 | abort (); | |
499 | ||
9de87eea | 500 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); |
8b0174c8 | 501 | t->heap_mutex_locked_by_self = 0; |
86a597f8 | 502 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
9de87eea | 503 | t->clear_freelists_p = 0; |
1a8fdd7e | 504 | t->gc_running_p = 0; |
2e77f720 | 505 | t->canceled = 0; |
9de87eea MV |
506 | t->exited = 0; |
507 | ||
508 | t->freelist = SCM_EOL; | |
509 | t->freelist2 = SCM_EOL; | |
510 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
511 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
512 | ||
513 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
514 | ||
515 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
8b0174c8 | 516 | t->heap_mutex_locked_by_self = 1; |
9de87eea MV |
517 | |
518 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
519 | t->next_thread = all_threads; | |
520 | all_threads = t; | |
521 | thread_count++; | |
522 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
523 | } |
524 | ||
9de87eea | 525 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 526 | */ |
9de87eea MV |
527 | static void |
528 | guilify_self_2 (SCM parent) | |
d823b11b | 529 | { |
9de87eea MV |
530 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
531 | ||
532 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
533 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
534 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
535 | t->continuation_base = t->base; | |
2bbe1533 | 536 | t->vm = SCM_BOOL_F; |
9de87eea MV |
537 | |
538 | if (scm_is_true (parent)) | |
539 | t->dynamic_state = scm_make_dynamic_state (parent); | |
540 | else | |
541 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
542 | ||
543 | t->join_queue = make_queue (); | |
544 | t->block_asyncs = 0; | |
d823b11b MV |
545 | } |
546 | ||
6180e336 NJ |
547 | \f |
548 | /*** Fat mutexes */ | |
549 | ||
550 | /* We implement our own mutex type since we want them to be 'fair', we | |
551 | want to do fancy things while waiting for them (like running | |
552 | asyncs) and we might want to add things that are nice for | |
553 | debugging. | |
554 | */ | |
555 | ||
556 | typedef struct { | |
557 | scm_i_pthread_mutex_t lock; | |
558 | SCM owner; | |
adc085f1 | 559 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 560 | |
adc085f1 | 561 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
562 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
563 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
564 | owned by the current thread? */ | |
565 | ||
566 | SCM waiting; /* the threads waiting for this mutex. */ | |
567 | } fat_mutex; | |
568 | ||
569 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
570 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
571 | ||
9de87eea | 572 | /* Perform thread tear-down, in guile mode. |
d823b11b | 573 | */ |
9de87eea MV |
574 | static void * |
575 | do_thread_exit (void *v) | |
576 | { | |
2e77f720 LC |
577 | scm_i_thread *t = (scm_i_thread *) v; |
578 | ||
579 | if (!scm_is_false (t->cleanup_handler)) | |
580 | { | |
581 | SCM ptr = t->cleanup_handler; | |
582 | ||
583 | t->cleanup_handler = SCM_BOOL_F; | |
584 | t->result = scm_internal_catch (SCM_BOOL_T, | |
585 | (scm_t_catch_body) scm_call_0, ptr, | |
586 | scm_handle_by_message_noexit, NULL); | |
587 | } | |
9de87eea | 588 | |
86a597f8 | 589 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
590 | |
591 | t->exited = 1; | |
0c97d7dd MV |
592 | close (t->sleep_pipe[0]); |
593 | close (t->sleep_pipe[1]); | |
9de87eea MV |
594 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
595 | ; | |
9de87eea | 596 | |
74926120 | 597 | while (!scm_is_null (t->mutexes)) |
6180e336 NJ |
598 | { |
599 | SCM mutex = SCM_CAR (t->mutexes); | |
600 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
601 | scm_i_pthread_mutex_lock (&m->lock); | |
74926120 | 602 | |
6180e336 NJ |
603 | unblock_from_queue (m->waiting); |
604 | ||
74926120 | 605 | scm_i_pthread_mutex_unlock (&m->lock); |
6180e336 NJ |
606 | t->mutexes = SCM_CDR (t->mutexes); |
607 | } | |
608 | ||
86a597f8 | 609 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 610 | |
9de87eea MV |
611 | return NULL; |
612 | } | |
613 | ||
d823b11b | 614 | static void |
9de87eea | 615 | on_thread_exit (void *v) |
d823b11b | 616 | { |
29776e85 | 617 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 618 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 619 | |
f9d44e84 NJ |
620 | /* If this thread was cancelled while doing a cond wait, it will |
621 | still have a mutex locked, so we unlock it here. */ | |
622 | if (t->held_mutex) | |
623 | { | |
624 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
625 | t->held_mutex = NULL; | |
626 | } | |
627 | ||
9de87eea | 628 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 629 | |
2e77f720 LC |
630 | /* Ensure the signal handling thread has been launched, because we might be |
631 | shutting it down. */ | |
632 | scm_i_ensure_signal_delivery_thread (); | |
633 | ||
0c97d7dd | 634 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 635 | since the queue is a SCM data structure. */ |
9de87eea | 636 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
637 | |
638 | /* Removing ourself from the list of all threads needs to happen in | |
639 | non-guile mode since all SCM values on our stack become | |
29776e85 | 640 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
641 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
642 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
643 | if (*tp == t) | |
644 | { | |
645 | *tp = t->next_thread; | |
646 | break; | |
647 | } | |
648 | thread_count--; | |
2e77f720 LC |
649 | |
650 | /* If there's only one other thread, it could be the signal delivery | |
651 | thread, so we need to notify it to shut down by closing its read pipe. | |
652 | If it's not the signal delivery thread, then closing the read pipe isn't | |
653 | going to hurt. */ | |
654 | if (thread_count <= 1) | |
655 | scm_i_close_signal_pipe (); | |
656 | ||
0c97d7dd MV |
657 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
658 | ||
9de87eea | 659 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
660 | } |
661 | ||
9de87eea | 662 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 663 | |
9de87eea MV |
664 | static void |
665 | init_thread_key (void) | |
666 | { | |
667 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
668 | } | |
d823b11b | 669 | |
9de87eea MV |
670 | /* Perform any initializations necessary to bring the current thread |
671 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 672 | |
9de87eea MV |
673 | BASE is the stack base to use with GC. |
674 | ||
675 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
676 | which case the default dynamic state is used. | |
677 | ||
678 | Return zero when the thread was in guile mode already; otherwise | |
679 | return 1. | |
680 | */ | |
681 | ||
682 | static int | |
683 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 684 | { |
9de87eea MV |
685 | scm_i_thread *t; |
686 | ||
687 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
688 | ||
689 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
690 | { | |
691 | /* This thread has not been guilified yet. | |
692 | */ | |
693 | ||
694 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
695 | if (scm_initialized_p == 0) | |
696 | { | |
697 | /* First thread ever to enter Guile. Run the full | |
698 | initialization. | |
699 | */ | |
700 | scm_i_init_guile (base); | |
701 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
702 | } | |
703 | else | |
704 | { | |
705 | /* Guile is already initialized, but this thread enters it for | |
706 | the first time. Only initialize this thread. | |
707 | */ | |
708 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
709 | guilify_self_1 (base); | |
710 | guilify_self_2 (parent); | |
711 | } | |
712 | return 1; | |
713 | } | |
714 | else if (t->top) | |
715 | { | |
716 | /* This thread is already guilified but not in guile mode, just | |
717 | resume it. | |
74926120 | 718 | |
ccf1ca4a LC |
719 | A user call to scm_with_guile() will lead us to here. This could |
720 | happen from anywhere on the stack, and in particular lower on the | |
721 | stack than when it was when this thread was first guilified. Thus, | |
722 | `base' must be updated. */ | |
723 | #if SCM_STACK_GROWS_UP | |
724 | if (base < t->base) | |
725 | t->base = base; | |
726 | #else | |
727 | if (base > t->base) | |
728 | t->base = base; | |
729 | #endif | |
730 | ||
9de87eea MV |
731 | scm_enter_guile ((scm_t_guile_ticket) t); |
732 | return 1; | |
733 | } | |
734 | else | |
735 | { | |
736 | /* Thread is already in guile mode. Nothing to do. | |
737 | */ | |
738 | return 0; | |
739 | } | |
d823b11b MV |
740 | } |
741 | ||
9de87eea | 742 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 743 | |
23d72566 KR |
744 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
745 | /* This method for GNU/Linux and perhaps some other systems. | |
746 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
747 | available on them. */ | |
9de87eea MV |
748 | #define HAVE_GET_THREAD_STACK_BASE |
749 | ||
750 | static SCM_STACKITEM * | |
751 | get_thread_stack_base () | |
d823b11b | 752 | { |
9de87eea MV |
753 | pthread_attr_t attr; |
754 | void *start, *end; | |
755 | size_t size; | |
756 | ||
9de87eea MV |
757 | pthread_getattr_np (pthread_self (), &attr); |
758 | pthread_attr_getstack (&attr, &start, &size); | |
759 | end = (char *)start + size; | |
760 | ||
2b829bbb KR |
761 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
762 | for the main thread, but we can use scm_get_stack_base in that | |
763 | case. | |
764 | */ | |
765 | ||
766 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 767 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 768 | return scm_get_stack_base (); |
9de87eea | 769 | else |
2b829bbb | 770 | #endif |
9de87eea MV |
771 | { |
772 | #if SCM_STACK_GROWS_UP | |
773 | return start; | |
774 | #else | |
775 | return end; | |
776 | #endif | |
777 | } | |
a54a94b3 MV |
778 | } |
779 | ||
23d72566 KR |
780 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
781 | /* This method for MacOS X. | |
782 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
783 | but as of 2006 there's nothing obvious at apple.com. */ | |
784 | #define HAVE_GET_THREAD_STACK_BASE | |
785 | static SCM_STACKITEM * | |
786 | get_thread_stack_base () | |
787 | { | |
788 | return pthread_get_stackaddr_np (pthread_self ()); | |
789 | } | |
790 | ||
791 | #elif defined (__MINGW32__) | |
792 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
793 | in any thread. We don't like hard-coding the name of a system, but there | |
794 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
795 | work. */ | |
796 | #define HAVE_GET_THREAD_STACK_BASE | |
797 | static SCM_STACKITEM * | |
798 | get_thread_stack_base () | |
799 | { | |
800 | return scm_get_stack_base (); | |
801 | } | |
802 | ||
803 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
804 | |
805 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
806 | ||
807 | #define HAVE_GET_THREAD_STACK_BASE | |
808 | ||
809 | static SCM_STACKITEM * | |
810 | get_thread_stack_base () | |
a54a94b3 | 811 | { |
2b829bbb | 812 | return scm_get_stack_base (); |
d823b11b MV |
813 | } |
814 | ||
9de87eea | 815 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
816 | |
817 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
818 | ||
819 | void | |
820 | scm_init_guile () | |
d823b11b | 821 | { |
9de87eea MV |
822 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
823 | scm_i_default_dynamic_state); | |
d823b11b MV |
824 | } |
825 | ||
9de87eea MV |
826 | #endif |
827 | ||
828 | void * | |
829 | scm_with_guile (void *(*func)(void *), void *data) | |
830 | { | |
831 | return scm_i_with_guile_and_parent (func, data, | |
832 | scm_i_default_dynamic_state); | |
833 | } | |
834 | ||
70eca635 | 835 | SCM_UNUSED static void |
2e77f720 LC |
836 | scm_leave_guile_cleanup (void *x) |
837 | { | |
838 | scm_leave_guile (); | |
839 | } | |
840 | ||
9de87eea | 841 | void * |
2e77f720 | 842 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
843 | { |
844 | void *res; | |
845 | int really_entered; | |
846 | SCM_STACKITEM base_item; | |
2e77f720 | 847 | |
9de87eea | 848 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 849 | if (really_entered) |
2e77f720 LC |
850 | { |
851 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
852 | res = scm_c_with_continuation_barrier (func, data); | |
853 | scm_i_pthread_cleanup_pop (0); | |
854 | scm_leave_guile (); | |
855 | } | |
74926120 | 856 | else |
2e77f720 LC |
857 | res = scm_c_with_continuation_barrier (func, data); |
858 | ||
9de87eea MV |
859 | return res; |
860 | } | |
861 | ||
862 | void * | |
863 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 864 | { |
9de87eea MV |
865 | void *res; |
866 | scm_t_guile_ticket t; | |
867 | t = scm_leave_guile (); | |
868 | res = func (data); | |
869 | scm_enter_guile (t); | |
870 | return res; | |
871 | } | |
872 | ||
873 | /*** Thread creation */ | |
874 | ||
875 | typedef struct { | |
876 | SCM parent; | |
877 | SCM thunk; | |
878 | SCM handler; | |
76da80e7 | 879 | SCM thread; |
9de87eea MV |
880 | scm_i_pthread_mutex_t mutex; |
881 | scm_i_pthread_cond_t cond; | |
882 | } launch_data; | |
d823b11b | 883 | |
9de87eea MV |
884 | static void * |
885 | really_launch (void *d) | |
886 | { | |
887 | launch_data *data = (launch_data *)d; | |
888 | SCM thunk = data->thunk, handler = data->handler; | |
889 | scm_i_thread *t; | |
d823b11b | 890 | |
9de87eea | 891 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 892 | |
9de87eea MV |
893 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
894 | data->thread = scm_current_thread (); | |
895 | scm_i_pthread_cond_signal (&data->cond); | |
896 | scm_i_pthread_mutex_unlock (&data->mutex); | |
897 | ||
898 | if (SCM_UNBNDP (handler)) | |
899 | t->result = scm_call_0 (thunk); | |
900 | else | |
901 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
902 | ||
903 | return 0; | |
d823b11b MV |
904 | } |
905 | ||
9de87eea MV |
906 | static void * |
907 | launch_thread (void *d) | |
908 | { | |
909 | launch_data *data = (launch_data *)d; | |
910 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
911 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
912 | return NULL; | |
913 | } | |
914 | ||
915 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 916 | (SCM thunk, SCM handler), |
9de87eea MV |
917 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
918 | "returning a new thread object representing the thread. The procedure\n" | |
919 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
920 | "\n" | |
921 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
922 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
923 | "handler. This catch is established inside the continuation barrier.\n" | |
924 | "\n" | |
925 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
926 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
927 | #define FUNC_NAME s_scm_call_with_new_thread |
928 | { | |
9de87eea MV |
929 | launch_data data; |
930 | scm_i_pthread_t id; | |
931 | int err; | |
d823b11b | 932 | |
9de87eea MV |
933 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
934 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
935 | handler, SCM_ARG2, FUNC_NAME); | |
936 | ||
937 | data.parent = scm_current_dynamic_state (); | |
938 | data.thunk = thunk; | |
939 | data.handler = handler; | |
940 | data.thread = SCM_BOOL_F; | |
941 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
942 | scm_i_pthread_cond_init (&data.cond, NULL); | |
943 | ||
944 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
945 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
946 | if (err) | |
947 | { | |
948 | scm_i_pthread_mutex_unlock (&data.mutex); | |
949 | errno = err; | |
950 | scm_syserror (NULL); | |
951 | } | |
952 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
953 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 954 | |
9de87eea | 955 | return data.thread; |
d823b11b MV |
956 | } |
957 | #undef FUNC_NAME | |
958 | ||
9de87eea MV |
959 | typedef struct { |
960 | SCM parent; | |
961 | scm_t_catch_body body; | |
962 | void *body_data; | |
963 | scm_t_catch_handler handler; | |
964 | void *handler_data; | |
965 | SCM thread; | |
966 | scm_i_pthread_mutex_t mutex; | |
967 | scm_i_pthread_cond_t cond; | |
968 | } spawn_data; | |
969 | ||
970 | static void * | |
971 | really_spawn (void *d) | |
972 | { | |
973 | spawn_data *data = (spawn_data *)d; | |
974 | scm_t_catch_body body = data->body; | |
975 | void *body_data = data->body_data; | |
976 | scm_t_catch_handler handler = data->handler; | |
977 | void *handler_data = data->handler_data; | |
978 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
979 | ||
980 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
981 | data->thread = scm_current_thread (); | |
982 | scm_i_pthread_cond_signal (&data->cond); | |
983 | scm_i_pthread_mutex_unlock (&data->mutex); | |
984 | ||
985 | if (handler == NULL) | |
986 | t->result = body (body_data); | |
987 | else | |
988 | t->result = scm_internal_catch (SCM_BOOL_T, | |
989 | body, body_data, | |
990 | handler, handler_data); | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | static void * | |
996 | spawn_thread (void *d) | |
997 | { | |
998 | spawn_data *data = (spawn_data *)d; | |
999 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1000 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1001 | return NULL; | |
1002 | } | |
1003 | ||
1004 | SCM | |
1005 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1006 | scm_t_catch_handler handler, void *handler_data) | |
1007 | { | |
1008 | spawn_data data; | |
1009 | scm_i_pthread_t id; | |
1010 | int err; | |
1011 | ||
1012 | data.parent = scm_current_dynamic_state (); | |
1013 | data.body = body; | |
1014 | data.body_data = body_data; | |
1015 | data.handler = handler; | |
1016 | data.handler_data = handler_data; | |
1017 | data.thread = SCM_BOOL_F; | |
1018 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1019 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1020 | ||
1021 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1022 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1023 | if (err) | |
1024 | { | |
1025 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1026 | errno = err; | |
1027 | scm_syserror (NULL); | |
1028 | } | |
1029 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1030 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1031 | |
9de87eea MV |
1032 | return data.thread; |
1033 | } | |
1034 | ||
29717c89 MD |
1035 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1036 | (), | |
1037 | "Move the calling thread to the end of the scheduling queue.") | |
1038 | #define FUNC_NAME s_scm_yield | |
1039 | { | |
9de87eea | 1040 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1041 | } |
1042 | #undef FUNC_NAME | |
1043 | ||
2e77f720 LC |
1044 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1045 | (SCM thread), | |
1046 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1047 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1048 | "been signaled to terminate, this function is a no-op.") | |
1049 | #define FUNC_NAME s_scm_cancel_thread | |
1050 | { | |
1051 | scm_i_thread *t = NULL; | |
1052 | ||
1053 | SCM_VALIDATE_THREAD (1, thread); | |
1054 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1055 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1056 | if (!t->canceled) |
1057 | { | |
1058 | t->canceled = 1; | |
86a597f8 | 1059 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1060 | scm_i_pthread_cancel (t->pthread); |
1061 | } | |
1062 | else | |
86a597f8 | 1063 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1064 | |
1065 | return SCM_UNSPECIFIED; | |
1066 | } | |
1067 | #undef FUNC_NAME | |
1068 | ||
1069 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1070 | (SCM thread, SCM proc), | |
1071 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1072 | "This handler will be called when the thread exits.") | |
1073 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1074 | { | |
1075 | scm_i_thread *t; | |
1076 | ||
1077 | SCM_VALIDATE_THREAD (1, thread); | |
1078 | if (!scm_is_false (proc)) | |
1079 | SCM_VALIDATE_THUNK (2, proc); | |
1080 | ||
2e77f720 | 1081 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1082 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1083 | ||
2e77f720 LC |
1084 | if (!(t->exited || t->canceled)) |
1085 | t->cleanup_handler = proc; | |
1086 | ||
86a597f8 | 1087 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1088 | |
1089 | return SCM_UNSPECIFIED; | |
1090 | } | |
1091 | #undef FUNC_NAME | |
1092 | ||
1093 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1094 | (SCM thread), | |
1095 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1096 | #define FUNC_NAME s_scm_thread_cleanup | |
1097 | { | |
1098 | scm_i_thread *t; | |
1099 | SCM ret; | |
1100 | ||
1101 | SCM_VALIDATE_THREAD (1, thread); | |
1102 | ||
2e77f720 | 1103 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1104 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1105 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1106 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1107 | |
1108 | return ret; | |
1109 | } | |
1110 | #undef FUNC_NAME | |
1111 | ||
6180e336 NJ |
1112 | SCM scm_join_thread (SCM thread) |
1113 | { | |
1114 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1115 | } | |
1116 | ||
1117 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1118 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1119 | "Suspend execution of the calling thread until the target @var{thread} " |
1120 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1121 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1122 | { |
9de87eea | 1123 | scm_i_thread *t; |
6180e336 NJ |
1124 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1125 | SCM res = SCM_BOOL_F; | |
1126 | ||
1127 | if (! (SCM_UNBNDP (timeoutval))) | |
1128 | res = timeoutval; | |
d823b11b MV |
1129 | |
1130 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1131 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1132 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1133 | |
9de87eea | 1134 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1135 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1136 | ||
6180e336 NJ |
1137 | if (! SCM_UNBNDP (timeout)) |
1138 | { | |
1139 | to_timespec (timeout, &ctimeout); | |
1140 | timeout_ptr = &ctimeout; | |
1141 | } | |
1142 | ||
1143 | if (t->exited) | |
1144 | res = t->result; | |
1145 | else | |
d823b11b | 1146 | { |
9de87eea MV |
1147 | while (1) |
1148 | { | |
74926120 | 1149 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1150 | timeout_ptr); |
1151 | if (err == 0) | |
1152 | { | |
1153 | if (t->exited) | |
1154 | { | |
1155 | res = t->result; | |
1156 | break; | |
1157 | } | |
1158 | } | |
1159 | else if (err == ETIMEDOUT) | |
9de87eea | 1160 | break; |
6180e336 | 1161 | |
86a597f8 | 1162 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1163 | SCM_TICK; |
86a597f8 | 1164 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1165 | |
1166 | /* Check for exit again, since we just released and | |
1167 | reacquired the admin mutex, before the next block_self | |
1168 | call (which would block forever if t has already | |
1169 | exited). */ | |
1170 | if (t->exited) | |
1171 | { | |
1172 | res = t->result; | |
1173 | break; | |
1174 | } | |
9de87eea | 1175 | } |
d823b11b | 1176 | } |
9de87eea | 1177 | |
86a597f8 | 1178 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1179 | |
d823b11b | 1180 | return res; |
5f05c406 MV |
1181 | } |
1182 | #undef FUNC_NAME | |
1183 | ||
6180e336 NJ |
1184 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1185 | (SCM obj), | |
1186 | "Return @code{#t} if @var{obj} is a thread.") | |
1187 | #define FUNC_NAME s_scm_thread_p | |
1188 | { | |
1189 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1190 | } | |
1191 | #undef FUNC_NAME | |
5f05c406 | 1192 | |
d823b11b | 1193 | static SCM |
9de87eea | 1194 | fat_mutex_mark (SCM mx) |
d823b11b | 1195 | { |
9de87eea | 1196 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
1197 | scm_gc_mark (m->owner); |
1198 | return m->waiting; | |
1199 | } | |
4079f87e | 1200 | |
9de87eea MV |
1201 | static size_t |
1202 | fat_mutex_free (SCM mx) | |
76da80e7 | 1203 | { |
9de87eea MV |
1204 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1205 | scm_i_pthread_mutex_destroy (&m->lock); | |
1206 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1207 | return 0; |
1208 | } | |
1209 | ||
1210 | static int | |
9de87eea | 1211 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1212 | { |
9de87eea MV |
1213 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1214 | scm_puts ("#<mutex ", port); | |
1215 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1216 | scm_puts (">", port); | |
1217 | return 1; | |
76da80e7 MV |
1218 | } |
1219 | ||
76da80e7 | 1220 | static SCM |
6180e336 | 1221 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1222 | { |
9de87eea MV |
1223 | fat_mutex *m; |
1224 | SCM mx; | |
1225 | ||
1226 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1227 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1228 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1229 | m->level = 0; |
6180e336 | 1230 | |
adc085f1 | 1231 | m->recursive = recursive; |
6180e336 NJ |
1232 | m->unchecked_unlock = unchecked_unlock; |
1233 | m->allow_external_unlock = external_unlock; | |
1234 | ||
9de87eea MV |
1235 | m->waiting = SCM_EOL; |
1236 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1237 | m->waiting = make_queue (); | |
1238 | return mx; | |
76da80e7 MV |
1239 | } |
1240 | ||
6180e336 NJ |
1241 | SCM scm_make_mutex (void) |
1242 | { | |
1243 | return scm_make_mutex_with_flags (SCM_EOL); | |
1244 | } | |
1245 | ||
2a1d0688 NJ |
1246 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1247 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1248 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1249 | |
1250 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1251 | (SCM flags), | |
9de87eea | 1252 | "Create a new mutex. ") |
6180e336 | 1253 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1254 | { |
6180e336 NJ |
1255 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1256 | ||
1257 | SCM ptr = flags; | |
1258 | while (! scm_is_null (ptr)) | |
1259 | { | |
1260 | SCM flag = SCM_CAR (ptr); | |
1261 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1262 | unchecked_unlock = 1; | |
1263 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1264 | external_unlock = 1; | |
1265 | else if (scm_is_eq (flag, recursive_sym)) | |
1266 | recursive = 1; | |
74926120 | 1267 | else |
2a1d0688 | 1268 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1269 | ptr = SCM_CDR (ptr); |
1270 | } | |
1271 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1272 | } |
1273 | #undef FUNC_NAME | |
1274 | ||
9de87eea | 1275 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1276 | (void), |
9de87eea MV |
1277 | "Create a new recursive mutex. ") |
1278 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1279 | { |
6180e336 | 1280 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1281 | } |
1282 | #undef FUNC_NAME | |
1283 | ||
6180e336 NJ |
1284 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1285 | ||
1286 | static SCM | |
adc085f1 | 1287 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1288 | { |
1289 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1290 | |
adc085f1 | 1291 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1292 | SCM err = SCM_BOOL_F; |
1293 | ||
1294 | struct timeval current_time; | |
9de87eea MV |
1295 | |
1296 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1297 | |
1298 | while (1) | |
9de87eea | 1299 | { |
adc085f1 | 1300 | if (m->level == 0) |
6180e336 | 1301 | { |
adc085f1 | 1302 | m->owner = new_owner; |
6180e336 | 1303 | m->level++; |
74926120 | 1304 | |
adc085f1 | 1305 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1306 | { |
adc085f1 | 1307 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 NJ |
1308 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1309 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1310 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
6180e336 | 1311 | } |
adc085f1 JG |
1312 | *ret = 1; |
1313 | break; | |
1314 | } | |
1315 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1316 | { | |
1317 | m->owner = new_owner; | |
1318 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1319 | scm_from_locale_string ("lock obtained on abandoned " | |
1320 | "mutex")); | |
1321 | *ret = 1; | |
1322 | break; | |
1323 | } | |
1324 | else if (scm_is_eq (m->owner, new_owner)) | |
1325 | { | |
1326 | if (m->recursive) | |
1327 | { | |
1328 | m->level++; | |
74926120 | 1329 | *ret = 1; |
adc085f1 JG |
1330 | } |
1331 | else | |
6180e336 | 1332 | { |
adc085f1 JG |
1333 | err = scm_cons (scm_misc_error_key, |
1334 | scm_from_locale_string ("mutex already locked " | |
1335 | "by thread")); | |
1336 | *ret = 0; | |
1337 | } | |
74926120 | 1338 | break; |
adc085f1 JG |
1339 | } |
1340 | else | |
1341 | { | |
74926120 | 1342 | if (timeout != NULL) |
adc085f1 JG |
1343 | { |
1344 | gettimeofday (¤t_time, NULL); | |
1345 | if (current_time.tv_sec > timeout->tv_sec || | |
1346 | (current_time.tv_sec == timeout->tv_sec && | |
1347 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1348 | { |
adc085f1 JG |
1349 | *ret = 0; |
1350 | break; | |
6180e336 | 1351 | } |
6180e336 | 1352 | } |
37a52039 | 1353 | block_self (m->waiting, mutex, &m->lock, timeout); |
adc085f1 JG |
1354 | scm_i_pthread_mutex_unlock (&m->lock); |
1355 | SCM_TICK; | |
1356 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
9de87eea MV |
1357 | } |
1358 | } | |
1359 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1360 | return err; |
9de87eea MV |
1361 | } |
1362 | ||
6180e336 NJ |
1363 | SCM scm_lock_mutex (SCM mx) |
1364 | { | |
adc085f1 | 1365 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1366 | } |
1367 | ||
adc085f1 JG |
1368 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1369 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1370 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1371 | "blocks until the mutex becomes available. The function returns when " | |
1372 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1373 | "a thread already owns will succeed right away and will not block the " | |
1374 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1375 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1376 | { |
6180e336 NJ |
1377 | SCM exception; |
1378 | int ret = 0; | |
1379 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1380 | |
6180e336 NJ |
1381 | SCM_VALIDATE_MUTEX (1, m); |
1382 | ||
1383 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1384 | { | |
1385 | to_timespec (timeout, &cwaittime); | |
1386 | waittime = &cwaittime; | |
1387 | } | |
1388 | ||
adc085f1 | 1389 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1390 | if (!scm_is_false (exception)) |
1391 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1392 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1393 | } |
76da80e7 | 1394 | #undef FUNC_NAME |
9bc4701c | 1395 | |
a4d106c7 | 1396 | void |
661ae7ab | 1397 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1398 | { |
661ae7ab MV |
1399 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1400 | SCM_F_WIND_EXPLICITLY); | |
1401 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1402 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1403 | } |
1404 | ||
9bc4701c | 1405 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1406 | (SCM mutex), |
9bc4701c MD |
1407 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1408 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1409 | #define FUNC_NAME s_scm_try_mutex | |
1410 | { | |
6180e336 NJ |
1411 | SCM exception; |
1412 | int ret = 0; | |
1413 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1414 | |
ba1b7223 | 1415 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1416 | |
1417 | to_timespec (scm_from_int(0), &cwaittime); | |
1418 | waittime = &cwaittime; | |
74926120 | 1419 | |
adc085f1 | 1420 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1421 | if (!scm_is_false (exception)) |
1422 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1423 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1424 | } |
1425 | #undef FUNC_NAME | |
76da80e7 | 1426 | |
6180e336 NJ |
1427 | /*** Fat condition variables */ |
1428 | ||
1429 | typedef struct { | |
1430 | scm_i_pthread_mutex_t lock; | |
1431 | SCM waiting; /* the threads waiting for this condition. */ | |
1432 | } fat_cond; | |
1433 | ||
1434 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1435 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1436 | ||
1437 | static int | |
1438 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1439 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1440 | { |
6180e336 NJ |
1441 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1442 | fat_cond *c = NULL; | |
1443 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1444 | int err = 0, ret = 0; | |
9de87eea MV |
1445 | |
1446 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1447 | |
1448 | SCM owner = m->owner; | |
1449 | ||
1450 | if (!scm_is_eq (owner, scm_current_thread ())) | |
9bc4701c | 1451 | { |
adc085f1 | 1452 | if (m->level == 0) |
6180e336 NJ |
1453 | { |
1454 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1455 | { |
1456 | scm_i_pthread_mutex_unlock (&m->lock); | |
1457 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1458 | } | |
adc085f1 | 1459 | owner = scm_current_thread (); |
6180e336 NJ |
1460 | } |
1461 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1462 | { |
1463 | scm_i_pthread_mutex_unlock (&m->lock); | |
1464 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1465 | } | |
6180e336 NJ |
1466 | } |
1467 | ||
1468 | if (! (SCM_UNBNDP (cond))) | |
1469 | { | |
6180e336 NJ |
1470 | c = SCM_CONDVAR_DATA (cond); |
1471 | while (1) | |
1472 | { | |
1473 | int brk = 0; | |
1474 | ||
6180e336 NJ |
1475 | if (m->level > 0) |
1476 | m->level--; | |
adc085f1 | 1477 | if (m->level == 0) |
6180e336 | 1478 | m->owner = unblock_from_queue (m->waiting); |
adc085f1 | 1479 | |
6180e336 | 1480 | t->block_asyncs++; |
74926120 | 1481 | |
f9d44e84 NJ |
1482 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1483 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1484 | |
1485 | if (err == 0) | |
1486 | { | |
1487 | ret = 1; | |
1488 | brk = 1; | |
1489 | } | |
1490 | else if (err == ETIMEDOUT) | |
1491 | { | |
1492 | ret = 0; | |
1493 | brk = 1; | |
1494 | } | |
1495 | else if (err != EINTR) | |
74926120 | 1496 | { |
6180e336 | 1497 | errno = err; |
6180e336 | 1498 | scm_syserror (NULL); |
74926120 | 1499 | } |
6180e336 NJ |
1500 | |
1501 | if (brk) | |
1502 | { | |
1503 | if (relock) | |
adc085f1 | 1504 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1505 | t->block_asyncs--; |
6180e336 NJ |
1506 | break; |
1507 | } | |
74926120 | 1508 | |
6180e336 NJ |
1509 | t->block_asyncs--; |
1510 | scm_async_click (); | |
74926120 | 1511 | |
6180e336 NJ |
1512 | scm_remember_upto_here_2 (cond, mutex); |
1513 | ||
1514 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1515 | } | |
9bc4701c | 1516 | } |
9de87eea | 1517 | else |
6180e336 NJ |
1518 | { |
1519 | if (m->level > 0) | |
1520 | m->level--; | |
74926120 | 1521 | if (m->level == 0) |
6180e336 | 1522 | m->owner = unblock_from_queue (m->waiting); |
74926120 | 1523 | |
6180e336 NJ |
1524 | scm_i_pthread_mutex_unlock (&m->lock); |
1525 | ret = 1; | |
1526 | } | |
74926120 | 1527 | |
6180e336 NJ |
1528 | return ret; |
1529 | } | |
9de87eea | 1530 | |
6180e336 NJ |
1531 | SCM scm_unlock_mutex (SCM mx) |
1532 | { | |
1533 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1534 | } |
9bc4701c | 1535 | |
6180e336 NJ |
1536 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1537 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1538 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1539 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1540 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1541 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1542 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1543 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1544 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1545 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1546 | { |
6180e336 NJ |
1547 | scm_t_timespec cwaittime, *waittime = NULL; |
1548 | ||
9bc4701c | 1549 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1550 | if (! (SCM_UNBNDP (cond))) |
1551 | { | |
1552 | SCM_VALIDATE_CONDVAR (2, cond); | |
1553 | ||
1554 | if (! (SCM_UNBNDP (timeout))) | |
1555 | { | |
1556 | to_timespec (timeout, &cwaittime); | |
1557 | waittime = &cwaittime; | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1562 | } |
1563 | #undef FUNC_NAME | |
1564 | ||
6180e336 NJ |
1565 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1566 | (SCM obj), | |
1567 | "Return @code{#t} if @var{obj} is a mutex.") | |
1568 | #define FUNC_NAME s_scm_mutex_p | |
1569 | { | |
1570 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1571 | } | |
74926120 | 1572 | #undef FUNC_NAME |
6180e336 | 1573 | |
9de87eea MV |
1574 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, |
1575 | (SCM mx), | |
1576 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1577 | #define FUNC_NAME s_scm_mutex_owner | |
1578 | { | |
adc085f1 JG |
1579 | SCM owner; |
1580 | fat_mutex *m = NULL; | |
1581 | ||
9de87eea | 1582 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1583 | m = SCM_MUTEX_DATA (mx); |
1584 | scm_i_pthread_mutex_lock (&m->lock); | |
1585 | owner = m->owner; | |
1586 | scm_i_pthread_mutex_unlock (&m->lock); | |
1587 | ||
1588 | return owner; | |
9de87eea MV |
1589 | } |
1590 | #undef FUNC_NAME | |
1591 | ||
1592 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1593 | (SCM mx), | |
adc085f1 | 1594 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1595 | #define FUNC_NAME s_scm_mutex_level |
1596 | { | |
1597 | SCM_VALIDATE_MUTEX (1, mx); | |
1598 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1599 | } | |
1600 | #undef FUNC_NAME | |
1601 | ||
adc085f1 JG |
1602 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1603 | (SCM mx), | |
1604 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1605 | #define FUNC_NAME s_scm_mutex_locked_p | |
1606 | { | |
1607 | SCM_VALIDATE_MUTEX (1, mx); | |
1608 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1609 | } | |
1610 | #undef FUNC_NAME | |
9de87eea | 1611 | |
9de87eea MV |
1612 | static SCM |
1613 | fat_cond_mark (SCM cv) | |
1614 | { | |
1615 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1616 | return c->waiting; | |
1617 | } | |
1618 | ||
1619 | static size_t | |
1620 | fat_cond_free (SCM mx) | |
1621 | { | |
1622 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
9de87eea MV |
1623 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); |
1624 | return 0; | |
1625 | } | |
1626 | ||
1627 | static int | |
1628 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1629 | { | |
1630 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1631 | scm_puts ("#<condition-variable ", port); | |
1632 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1633 | scm_puts (">", port); | |
1634 | return 1; | |
1635 | } | |
9bc4701c | 1636 | |
d823b11b MV |
1637 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1638 | (void), | |
1639 | "Make a new condition variable.") | |
1640 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1641 | { |
9de87eea MV |
1642 | fat_cond *c; |
1643 | SCM cv; | |
1644 | ||
1645 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1646 | c->waiting = SCM_EOL; |
1647 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1648 | c->waiting = make_queue (); | |
d823b11b | 1649 | return cv; |
5f05c406 | 1650 | } |
d823b11b | 1651 | #undef FUNC_NAME |
5f05c406 | 1652 | |
d823b11b MV |
1653 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1654 | (SCM cv, SCM mx, SCM t), | |
1655 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1656 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1657 | "is locked again when this function returns. When @var{time} is given, " | |
1658 | "it specifies a point in time where the waiting should be aborted. It " | |
1659 | "can be either a integer as returned by @code{current-time} or a pair " | |
1660 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1661 | "mutex is locked and @code{#f} is returned. When the condition " | |
1662 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1663 | "is returned. ") | |
1664 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1665 | { |
9de87eea | 1666 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1667 | |
1668 | SCM_VALIDATE_CONDVAR (1, cv); | |
1669 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1670 | |
d823b11b MV |
1671 | if (!SCM_UNBNDP (t)) |
1672 | { | |
6180e336 | 1673 | to_timespec (t, &waittime); |
9de87eea | 1674 | waitptr = &waittime; |
d823b11b MV |
1675 | } |
1676 | ||
2a1d0688 | 1677 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1678 | } |
d823b11b | 1679 | #undef FUNC_NAME |
5f05c406 | 1680 | |
9de87eea MV |
1681 | static void |
1682 | fat_cond_signal (fat_cond *c) | |
1683 | { | |
9de87eea | 1684 | unblock_from_queue (c->waiting); |
9de87eea MV |
1685 | } |
1686 | ||
d823b11b MV |
1687 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1688 | (SCM cv), | |
1689 | "Wake up one thread that is waiting for @var{cv}") | |
1690 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1691 | { |
d823b11b | 1692 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1693 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1694 | return SCM_BOOL_T; |
5f05c406 | 1695 | } |
d823b11b | 1696 | #undef FUNC_NAME |
5f05c406 | 1697 | |
9de87eea MV |
1698 | static void |
1699 | fat_cond_broadcast (fat_cond *c) | |
1700 | { | |
9de87eea MV |
1701 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1702 | ; | |
9de87eea MV |
1703 | } |
1704 | ||
d823b11b MV |
1705 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1706 | (SCM cv), | |
1707 | "Wake up all threads that are waiting for @var{cv}. ") | |
1708 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1709 | { |
d823b11b | 1710 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1711 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1712 | return SCM_BOOL_T; |
5f05c406 | 1713 | } |
d823b11b | 1714 | #undef FUNC_NAME |
5f05c406 | 1715 | |
6180e336 NJ |
1716 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1717 | (SCM obj), | |
1718 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1719 | #define FUNC_NAME s_scm_condition_variable_p | |
1720 | { | |
1721 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1722 | } | |
1723 | #undef FUNC_NAME | |
1724 | ||
d823b11b MV |
1725 | /*** Marking stacks */ |
1726 | ||
1727 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1728 | threads as well? | |
1729 | */ | |
1730 | #ifdef __ia64__ | |
1731 | # define SCM_MARK_BACKING_STORE() do { \ | |
1732 | ucontext_t ctx; \ | |
1733 | SCM_STACKITEM * top, * bot; \ | |
1734 | getcontext (&ctx); \ | |
1735 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1736 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1737 | / sizeof (SCM_STACKITEM))); \ | |
346e4402 | 1738 | bot = (SCM_STACKITEM *) SCM_I_CURRENT_THREAD->register_backing_store_base; \ |
9a5fa6e9 | 1739 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ |
d823b11b MV |
1740 | scm_mark_locations (bot, top - bot); } while (0) |
1741 | #else | |
1742 | # define SCM_MARK_BACKING_STORE() | |
1743 | #endif | |
1744 | ||
1745 | void | |
1746 | scm_threads_mark_stacks (void) | |
5f05c406 | 1747 | { |
9de87eea MV |
1748 | scm_i_thread *t; |
1749 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1750 | { |
9de87eea MV |
1751 | /* Check that thread has indeed been suspended. |
1752 | */ | |
1753 | assert (t->top); | |
6087fad9 | 1754 | |
9de87eea | 1755 | scm_gc_mark (t->handle); |
6087fad9 | 1756 | |
d028af45 | 1757 | #if SCM_STACK_GROWS_UP |
9de87eea | 1758 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1759 | #else |
9de87eea | 1760 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1761 | #endif |
88cefbc7 | 1762 | scm_mark_locations ((void *) &t->regs, |
6087fad9 MV |
1763 | ((size_t) sizeof(t->regs) |
1764 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1765 | } |
59152722 MV |
1766 | |
1767 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1768 | } |
1769 | ||
d823b11b MV |
1770 | /*** Select */ |
1771 | ||
911782b7 | 1772 | int |
9de87eea MV |
1773 | scm_std_select (int nfds, |
1774 | SELECT_TYPE *readfds, | |
1775 | SELECT_TYPE *writefds, | |
1776 | SELECT_TYPE *exceptfds, | |
1777 | struct timeval *timeout) | |
1778 | { | |
1779 | fd_set my_readfds; | |
1780 | int res, eno, wakeup_fd; | |
1781 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1782 | scm_t_guile_ticket ticket; | |
1783 | ||
1784 | if (readfds == NULL) | |
1785 | { | |
1786 | FD_ZERO (&my_readfds); | |
1787 | readfds = &my_readfds; | |
1788 | } | |
1789 | ||
1790 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1791 | SCM_TICK; | |
1792 | ||
1793 | wakeup_fd = t->sleep_pipe[0]; | |
1794 | ticket = scm_leave_guile (); | |
1795 | FD_SET (wakeup_fd, readfds); | |
1796 | if (wakeup_fd >= nfds) | |
1797 | nfds = wakeup_fd+1; | |
1798 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1799 | t->sleep_fd = -1; | |
d823b11b | 1800 | eno = errno; |
9de87eea MV |
1801 | scm_enter_guile (ticket); |
1802 | ||
1803 | scm_i_reset_sleep (t); | |
1804 | ||
1805 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1806 | { | |
1807 | char dummy; | |
634aa8de LC |
1808 | full_read (wakeup_fd, &dummy, 1); |
1809 | ||
9de87eea MV |
1810 | FD_CLR (wakeup_fd, readfds); |
1811 | res -= 1; | |
1812 | if (res == 0) | |
1813 | { | |
1814 | eno = EINTR; | |
1815 | res = -1; | |
1816 | } | |
1817 | } | |
d823b11b MV |
1818 | errno = eno; |
1819 | return res; | |
5f05c406 MV |
1820 | } |
1821 | ||
9de87eea | 1822 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1823 | |
9de87eea | 1824 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1825 | |
9bc4701c | 1826 | int |
9de87eea | 1827 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1828 | { |
71a5964c KR |
1829 | if (scm_i_pthread_mutex_trylock (mutex) == 0) |
1830 | return 0; | |
1831 | else | |
1832 | { | |
1833 | scm_t_guile_ticket t = scm_leave_guile (); | |
1834 | int res = scm_i_pthread_mutex_lock (mutex); | |
1835 | scm_enter_guile (t); | |
1836 | return res; | |
1837 | } | |
9bc4701c MD |
1838 | } |
1839 | ||
9de87eea | 1840 | static void |
2b829bbb | 1841 | do_unlock (void *data) |
28d52ebb | 1842 | { |
9de87eea | 1843 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1844 | } |
1845 | ||
1846 | void | |
661ae7ab | 1847 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1848 | { |
9de87eea | 1849 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1850 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1851 | } |
1852 | ||
9bc4701c | 1853 | int |
9de87eea | 1854 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1855 | { |
9de87eea | 1856 | scm_t_guile_ticket t = scm_leave_guile (); |
f9d44e84 | 1857 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1858 | int res = scm_i_pthread_cond_wait (cond, mutex); |
f9d44e84 | 1859 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea | 1860 | scm_enter_guile (t); |
9bc4701c MD |
1861 | return res; |
1862 | } | |
9bc4701c | 1863 | |
76da80e7 | 1864 | int |
9de87eea MV |
1865 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1866 | scm_i_pthread_mutex_t *mutex, | |
1867 | const scm_t_timespec *wt) | |
76da80e7 | 1868 | { |
9de87eea | 1869 | scm_t_guile_ticket t = scm_leave_guile (); |
f9d44e84 | 1870 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1871 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); |
f9d44e84 | 1872 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea MV |
1873 | scm_enter_guile (t); |
1874 | return res; | |
76da80e7 MV |
1875 | } |
1876 | ||
9de87eea | 1877 | #endif |
76da80e7 | 1878 | |
d823b11b | 1879 | unsigned long |
9de87eea | 1880 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1881 | { |
d823b11b MV |
1882 | struct timeval tv; |
1883 | tv.tv_usec = usecs % 1000000; | |
1884 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1885 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1886 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1887 | } |
1888 | ||
9de87eea MV |
1889 | unsigned int |
1890 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1891 | { |
d823b11b MV |
1892 | struct timeval tv; |
1893 | tv.tv_usec = 0; | |
1894 | tv.tv_sec = secs; | |
9de87eea | 1895 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1896 | return tv.tv_sec; |
6c214b62 MD |
1897 | } |
1898 | ||
d823b11b MV |
1899 | /*** Misc */ |
1900 | ||
1901 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1902 | (void), | |
1903 | "Return the thread that called this function.") | |
1904 | #define FUNC_NAME s_scm_current_thread | |
1905 | { | |
9de87eea | 1906 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1907 | } |
1908 | #undef FUNC_NAME | |
1909 | ||
9de87eea MV |
1910 | static SCM |
1911 | scm_c_make_list (size_t n, SCM fill) | |
1912 | { | |
1913 | SCM res = SCM_EOL; | |
1914 | while (n-- > 0) | |
1915 | res = scm_cons (fill, res); | |
1916 | return res; | |
1917 | } | |
1918 | ||
d823b11b MV |
1919 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1920 | (void), | |
1921 | "Return a list of all threads.") | |
9bc4701c | 1922 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1923 | { |
9de87eea MV |
1924 | /* We can not allocate while holding the thread_admin_mutex because |
1925 | of the way GC is done. | |
1926 | */ | |
1927 | int n = thread_count; | |
1928 | scm_i_thread *t; | |
1929 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1930 | |
9de87eea MV |
1931 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1932 | l = &list; | |
1933 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1934 | { | |
2e77f720 LC |
1935 | if (t != scm_i_signal_delivery_thread) |
1936 | { | |
1937 | SCM_SETCAR (*l, t->handle); | |
1938 | l = SCM_CDRLOC (*l); | |
1939 | } | |
9de87eea MV |
1940 | n--; |
1941 | } | |
1942 | *l = SCM_EOL; | |
1943 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1944 | return list; | |
d823b11b | 1945 | } |
9de87eea | 1946 | #undef FUNC_NAME |
d823b11b MV |
1947 | |
1948 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1949 | (SCM thread), | |
1950 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1951 | #define FUNC_NAME s_scm_thread_exited_p | |
1952 | { | |
7888309b | 1953 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1954 | } |
1955 | #undef FUNC_NAME | |
1956 | ||
911782b7 | 1957 | int |
d823b11b MV |
1958 | scm_c_thread_exited_p (SCM thread) |
1959 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1960 | { |
9de87eea | 1961 | scm_i_thread *t; |
d823b11b | 1962 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1963 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1964 | return t->exited; |
5f05c406 | 1965 | } |
d823b11b | 1966 | #undef FUNC_NAME |
5f05c406 | 1967 | |
9de87eea | 1968 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1969 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1970 | static int threads_initialized_p = 0; |
1971 | ||
1972 | void | |
1973 | scm_i_thread_put_to_sleep () | |
1974 | { | |
6087fad9 | 1975 | if (threads_initialized_p) |
9bc4701c | 1976 | { |
9de87eea | 1977 | scm_i_thread *t; |
6087fad9 | 1978 | |
9de87eea MV |
1979 | scm_leave_guile (); |
1980 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1981 | ||
74926120 | 1982 | /* Signal all threads to go to sleep |
0c97d7dd MV |
1983 | */ |
1984 | scm_i_thread_go_to_sleep = 1; | |
1985 | for (t = all_threads; t; t = t->next_thread) | |
1986 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1987 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1988 | } |
1989 | } | |
1990 | ||
b0dc3d71 MD |
1991 | void |
1992 | scm_i_thread_invalidate_freelists () | |
1993 | { | |
9de87eea MV |
1994 | /* thread_admin_mutex is already locked. */ |
1995 | ||
1996 | scm_i_thread *t; | |
1997 | for (t = all_threads; t; t = t->next_thread) | |
1998 | if (t != SCM_I_CURRENT_THREAD) | |
1999 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
2000 | } |
2001 | ||
9bc4701c MD |
2002 | void |
2003 | scm_i_thread_wake_up () | |
2004 | { | |
6087fad9 | 2005 | if (threads_initialized_p) |
9bc4701c | 2006 | { |
9de87eea | 2007 | scm_i_thread *t; |
9de87eea | 2008 | |
0c97d7dd MV |
2009 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
2010 | for (t = all_threads; t; t = t->next_thread) | |
2011 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
2012 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
2013 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 2014 | } |
9bc4701c MD |
2015 | } |
2016 | ||
2017 | void | |
2018 | scm_i_thread_sleep_for_gc () | |
2019 | { | |
9de87eea | 2020 | scm_i_thread *t = suspend (); |
8b0174c8 NJ |
2021 | |
2022 | /* Don't put t->heap_mutex in t->held_mutex here, because if the | |
2023 | thread is cancelled during the cond wait, the thread's cleanup | |
2024 | function (scm_leave_guile_cleanup) will handle unlocking the | |
2025 | heap_mutex, so we don't need to do that again in on_thread_exit. | |
2026 | */ | |
9de87eea | 2027 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); |
8b0174c8 | 2028 | |
b0dc3d71 | 2029 | resume (t); |
9bc4701c MD |
2030 | } |
2031 | ||
a4d106c7 MV |
2032 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
2033 | */ | |
d1138028 | 2034 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
2035 | int scm_i_critical_section_level = 0; |
2036 | ||
661ae7ab | 2037 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 2038 | |
9bc4701c | 2039 | void |
661ae7ab | 2040 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 2041 | { |
a4d106c7 | 2042 | if (scm_is_false (mutex)) |
661ae7ab MV |
2043 | mutex = dynwind_critical_section_mutex; |
2044 | scm_dynwind_lock_mutex (mutex); | |
2045 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2046 | } |
2047 | ||
2048 | /*** Initialization */ | |
2049 | ||
2050 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
2051 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
2052 | ||
d1138028 MV |
2053 | #if SCM_USE_PTHREAD_THREADS |
2054 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2055 | #endif | |
2056 | ||
9de87eea MV |
2057 | void |
2058 | scm_threads_prehistory (SCM_STACKITEM *base) | |
2059 | { | |
d1138028 MV |
2060 | #if SCM_USE_PTHREAD_THREADS |
2061 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2062 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2063 | PTHREAD_MUTEX_RECURSIVE); | |
2064 | #endif | |
2065 | ||
2066 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2067 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2068 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2069 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
2070 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
2071 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
74926120 | 2072 | |
9de87eea | 2073 | guilify_self_1 (base); |
9bc4701c MD |
2074 | } |
2075 | ||
d823b11b MV |
2076 | scm_t_bits scm_tc16_thread; |
2077 | scm_t_bits scm_tc16_mutex; | |
2078 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2079 | |
7bfd3b9e | 2080 | void |
9de87eea | 2081 | scm_init_threads () |
7bfd3b9e | 2082 | { |
9de87eea | 2083 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
2084 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
2085 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
2086 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
2087 | ||
9de87eea MV |
2088 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
2089 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
2090 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
2091 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2092 | |
9de87eea MV |
2093 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2094 | sizeof (fat_cond)); | |
2095 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
2096 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
2097 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 2098 | |
9de87eea MV |
2099 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2100 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2101 | threads_initialized_p = 1; |
a4d106c7 | 2102 | |
661ae7ab | 2103 | dynwind_critical_section_mutex = |
a4d106c7 | 2104 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 2105 | } |
89e00824 | 2106 | |
5f05c406 | 2107 | void |
9de87eea | 2108 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2109 | { |
9de87eea MV |
2110 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
2111 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
2112 | } |
2113 | ||
d823b11b | 2114 | void |
9de87eea | 2115 | scm_init_thread_procs () |
d823b11b | 2116 | { |
9de87eea | 2117 | #include "libguile/threads.x" |
d823b11b MV |
2118 | } |
2119 | ||
89e00824 ML |
2120 | /* |
2121 | Local Variables: | |
2122 | c-file-style: "gnu" | |
2123 | End: | |
2124 | */ |