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 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 | 19 | \f |
dbb605f5 LC |
20 | #ifdef HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
7bfd3b9e | 23 | |
1810dc4e RB |
24 | #include "libguile/_scm.h" |
25 | ||
fcc5d734 | 26 | #if HAVE_UNISTD_H |
d823b11b | 27 | #include <unistd.h> |
fcc5d734 | 28 | #endif |
d823b11b MV |
29 | #include <stdio.h> |
30 | #include <assert.h> | |
8ab3d8a0 KR |
31 | |
32 | #ifdef HAVE_STRING_H | |
33 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
34 | #endif | |
35 | ||
fcc5d734 | 36 | #if HAVE_SYS_TIME_H |
d823b11b | 37 | #include <sys/time.h> |
fcc5d734 | 38 | #endif |
5f05c406 | 39 | |
d823b11b MV |
40 | #include "libguile/validate.h" |
41 | #include "libguile/root.h" | |
42 | #include "libguile/eval.h" | |
43 | #include "libguile/async.h" | |
44 | #include "libguile/ports.h" | |
45 | #include "libguile/threads.h" | |
a0599745 | 46 | #include "libguile/dynwind.h" |
d823b11b | 47 | #include "libguile/iselect.h" |
9de87eea MV |
48 | #include "libguile/fluids.h" |
49 | #include "libguile/continuations.h" | |
2b829bbb | 50 | #include "libguile/gc.h" |
9de87eea | 51 | #include "libguile/init.h" |
2e77f720 | 52 | #include "libguile/scmsigs.h" |
6180e336 | 53 | #include "libguile/strings.h" |
7bfd3b9e | 54 | |
ecc9f40f MV |
55 | #ifdef __MINGW32__ |
56 | #ifndef ETIMEDOUT | |
57 | # define ETIMEDOUT WSAETIMEDOUT | |
58 | #endif | |
59 | # include <fcntl.h> | |
60 | # include <process.h> | |
61 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
62 | #endif /* __MINGW32__ */ | |
63 | ||
6180e336 NJ |
64 | static void |
65 | to_timespec (SCM t, scm_t_timespec *waittime) | |
66 | { | |
67 | if (scm_is_pair (t)) | |
68 | { | |
69 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
70 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
71 | } | |
72 | else | |
73 | { | |
74 | double time = scm_to_double (t); | |
75 | double sec = scm_c_truncate (time); | |
76 | ||
77 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 78 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
79 | } |
80 | } | |
81 | ||
d823b11b | 82 | /*** Queues */ |
7bfd3b9e | 83 | |
9de87eea MV |
84 | /* Make an empty queue data structure. |
85 | */ | |
d823b11b MV |
86 | static SCM |
87 | make_queue () | |
88 | { | |
89 | return scm_cons (SCM_EOL, SCM_EOL); | |
90 | } | |
7bfd3b9e | 91 | |
9de87eea MV |
92 | /* Put T at the back of Q and return a handle that can be used with |
93 | remqueue to remove T from Q again. | |
94 | */ | |
d823b11b MV |
95 | static SCM |
96 | enqueue (SCM q, SCM t) | |
97 | { | |
98 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 99 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 100 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
101 | SCM_SETCDR (q, c); |
102 | else | |
103 | SCM_SETCDR (SCM_CAR (q), c); | |
104 | SCM_SETCAR (q, c); | |
d2a51087 | 105 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
106 | return c; |
107 | } | |
7bfd3b9e | 108 | |
9de87eea MV |
109 | /* Remove the element that the handle C refers to from the queue Q. C |
110 | must have been returned from a call to enqueue. The return value | |
111 | is zero when the element referred to by C has already been removed. | |
112 | Otherwise, 1 is returned. | |
113 | */ | |
114 | static int | |
d823b11b MV |
115 | remqueue (SCM q, SCM c) |
116 | { | |
117 | SCM p, prev = q; | |
d2a51087 | 118 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 119 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 120 | { |
bc36d050 | 121 | if (scm_is_eq (p, c)) |
d823b11b | 122 | { |
bc36d050 | 123 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
124 | SCM_SETCAR (q, SCM_CDR (c)); |
125 | SCM_SETCDR (prev, SCM_CDR (c)); | |
d2a51087 | 126 | SCM_CRITICAL_SECTION_END; |
9de87eea | 127 | return 1; |
d823b11b MV |
128 | } |
129 | prev = p; | |
130 | } | |
d2a51087 | 131 | SCM_CRITICAL_SECTION_END; |
9de87eea | 132 | return 0; |
d823b11b MV |
133 | } |
134 | ||
9de87eea MV |
135 | /* Remove the front-most element from the queue Q and return it. |
136 | Return SCM_BOOL_F when Q is empty. | |
137 | */ | |
d823b11b MV |
138 | static SCM |
139 | dequeue (SCM q) | |
140 | { | |
d2a51087 NJ |
141 | SCM c; |
142 | SCM_CRITICAL_SECTION_START; | |
143 | c = SCM_CDR (q); | |
d2e53ed6 | 144 | if (scm_is_null (c)) |
d2a51087 NJ |
145 | { |
146 | SCM_CRITICAL_SECTION_END; | |
147 | return SCM_BOOL_F; | |
148 | } | |
d823b11b MV |
149 | else |
150 | { | |
151 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 152 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 153 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 154 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
155 | return SCM_CAR (c); |
156 | } | |
157 | } | |
7bfd3b9e | 158 | |
9de87eea | 159 | /*** Thread smob routines */ |
76da80e7 | 160 | |
d823b11b MV |
161 | static SCM |
162 | thread_mark (SCM obj) | |
163 | { | |
9de87eea | 164 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
d823b11b | 165 | scm_gc_mark (t->result); |
2e77f720 | 166 | scm_gc_mark (t->cleanup_handler); |
9de87eea | 167 | scm_gc_mark (t->join_queue); |
6180e336 | 168 | scm_gc_mark (t->mutexes); |
9de87eea MV |
169 | scm_gc_mark (t->dynwinds); |
170 | scm_gc_mark (t->active_asyncs); | |
9de87eea MV |
171 | scm_gc_mark (t->continuation_root); |
172 | return t->dynamic_state; | |
d823b11b MV |
173 | } |
174 | ||
175 | static int | |
176 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
177 | { | |
23d72566 KR |
178 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
179 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
180 | the struct case, hence we go via a union, and extract according to the | |
181 | size of pthread_t. */ | |
182 | union { | |
183 | scm_i_pthread_t p; | |
184 | unsigned short us; | |
185 | unsigned int ui; | |
186 | unsigned long ul; | |
187 | scm_t_uintmax um; | |
188 | } u; | |
9de87eea | 189 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
190 | scm_i_pthread_t p = t->pthread; |
191 | scm_t_uintmax id; | |
192 | u.p = p; | |
193 | if (sizeof (p) == sizeof (unsigned short)) | |
194 | id = u.us; | |
195 | else if (sizeof (p) == sizeof (unsigned int)) | |
196 | id = u.ui; | |
197 | else if (sizeof (p) == sizeof (unsigned long)) | |
198 | id = u.ul; | |
199 | else | |
200 | id = u.um; | |
201 | ||
d823b11b | 202 | scm_puts ("#<thread ", port); |
23d72566 | 203 | scm_uintprint (id, 10, port); |
1b92fb6b | 204 | scm_puts (" (", port); |
0345e278 | 205 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 206 | scm_puts (")>", port); |
d823b11b MV |
207 | return 1; |
208 | } | |
209 | ||
210 | static size_t | |
211 | thread_free (SCM obj) | |
212 | { | |
9de87eea MV |
213 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
214 | assert (t->exited); | |
d823b11b MV |
215 | scm_gc_free (t, sizeof (*t), "thread"); |
216 | return 0; | |
217 | } | |
218 | ||
9de87eea | 219 | /*** Blocking on queues. */ |
f7eca35d | 220 | |
9de87eea MV |
221 | /* See also scm_i_queue_async_cell for how such a block is |
222 | interrputed. | |
223 | */ | |
d823b11b | 224 | |
9de87eea MV |
225 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
226 | be woken up by a call to 'unblock_from_queue', or to be | |
227 | interrupted. Upon return of this function, the current thread is | |
228 | no longer on QUEUE, even when the sleep has been interrupted. | |
229 | ||
d2a51087 | 230 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
231 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
232 | ||
233 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
234 | as MUTEX is needed. | |
235 | ||
236 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
237 | ||
238 | The return value of block_self is an errno value. It will be zero | |
239 | when the sleep has been successfully completed by a call to | |
240 | unblock_from_queue, EINTR when it has been interrupted by the | |
241 | delivery of a system async, and ETIMEDOUT when the timeout has | |
242 | expired. | |
243 | ||
244 | The system asyncs themselves are not executed by block_self. | |
245 | */ | |
246 | static int | |
247 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
248 | const scm_t_timespec *waittime) | |
76da80e7 | 249 | { |
9de87eea MV |
250 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
251 | SCM q_handle; | |
252 | int err; | |
253 | ||
254 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
255 | err = EINTR; | |
256 | else | |
257 | { | |
258 | t->block_asyncs++; | |
259 | q_handle = enqueue (queue, t->handle); | |
260 | if (waittime == NULL) | |
261 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
262 | else | |
263 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
264 | ||
265 | /* When we are still on QUEUE, we have been interrupted. We | |
266 | report this only when no other error (such as a timeout) has | |
267 | happened above. | |
268 | */ | |
269 | if (remqueue (queue, q_handle) && err == 0) | |
270 | err = EINTR; | |
271 | t->block_asyncs--; | |
272 | scm_i_reset_sleep (t); | |
273 | } | |
274 | ||
275 | return err; | |
76da80e7 | 276 | } |
9de87eea | 277 | |
d2a51087 NJ |
278 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
279 | returned, or #f if the queue was empty. | |
9de87eea MV |
280 | */ |
281 | static SCM | |
282 | unblock_from_queue (SCM queue) | |
283 | { | |
284 | SCM thread = dequeue (queue); | |
285 | if (scm_is_true (thread)) | |
286 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
287 | return thread; | |
288 | } | |
289 | ||
290 | /* Getting into and out of guile mode. | |
291 | */ | |
292 | ||
98648121 MV |
293 | /* Ken Raeburn observes that the implementation of suspend and resume |
294 | (and the things that build on top of them) are very likely not | |
295 | correct (see below). We will need fix this eventually, and that's | |
296 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
297 | ||
298 | Ken writes: | |
299 | ||
300 | Consider this sequence: | |
301 | ||
302 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
303 | through scm_leave_guile), which does this: | |
304 | ||
305 | // record top of stack for the GC | |
306 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
307 | var 't' | |
308 | // save registers. | |
309 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
310 | setjmp (t->regs); // here's most of the magic | |
311 | ||
312 | ... and returns. | |
313 | ||
314 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
315 | a caller-saved register R, and it's the only reference to the object | |
316 | currently. | |
317 | ||
318 | The compiler wants to use R in suspend, so it pushes the current | |
319 | value, X, into a stack slot which will be reloaded on exit from | |
320 | suspend; then it loads stuff into R and goes about its business. The | |
321 | setjmp call saves (some of) the current registers, including R, which | |
322 | no longer contains X. (This isn't a problem for a normal | |
323 | setjmp/longjmp situation, where longjmp would be called before | |
324 | setjmp's caller returns; the old value for X would be loaded back from | |
325 | the stack after the longjmp, before the function returned.) | |
326 | ||
327 | So, suspend returns, loading X back into R (and invalidating the jump | |
328 | buffer) in the process. The caller foo then goes off and calls a | |
329 | bunch of other functions out of Guile mode, occasionally storing X on | |
330 | the stack again, but, say, much deeper on the stack than suspend's | |
331 | stack frame went, and the stack slot where suspend had written X has | |
332 | long since been overwritten with other values. | |
333 | ||
334 | Okay, nothing actively broken so far. Now, let garbage collection | |
335 | run, triggered by another thread. | |
336 | ||
337 | The thread calling foo is out of Guile mode at the time, so the | |
338 | garbage collector just scans a range of stack addresses. Too bad that | |
339 | X isn't stored there. So the pointed-to storage goes onto the free | |
340 | list, and I think you can see where things go from there. | |
341 | ||
342 | Is there anything I'm missing that'll prevent this scenario from | |
343 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
344 | don't have many local variables, so they probably won't need to save | |
345 | any registers on most systems, so we hope everything will wind up in | |
346 | the jump buffer and we'll just get away with it"? | |
347 | ||
348 | (And, going the other direction, if scm_leave_guile and suspend push | |
349 | the stack pointer over onto a new page, and foo doesn't make further | |
350 | function calls and thus the stack pointer no longer includes that | |
351 | page, are we guaranteed that the kernel cannot release the now-unused | |
352 | stack page that contains the top-of-stack pointer we just saved? I | |
353 | don't know if any OS actually does that. If it does, we could get | |
354 | faults in garbage collection.) | |
355 | ||
356 | I don't think scm_without_guile has to have this problem, as it gets | |
357 | more control over the stack handling -- but it should call setjmp | |
358 | itself. I'd probably try something like: | |
359 | ||
360 | // record top of stack for the GC | |
361 | t->top = SCM_STACK_PTR (&t); | |
362 | // save registers. | |
363 | SCM_FLUSH_REGISTER_WINDOWS; | |
364 | setjmp (t->regs); | |
365 | res = func(data); | |
366 | scm_enter_guile (t); | |
367 | ||
368 | ... though even that's making some assumptions about the stack | |
369 | ordering of local variables versus caller-saved registers. | |
370 | ||
371 | For something like scm_leave_guile to work, I don't think it can just | |
372 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
373 | on the stack state at the point when the jump buffer was initialized, | |
374 | together, would work fine, but I think then we're talking about macros | |
375 | invoking setjmp in the caller's stack frame, and requiring that the | |
376 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
377 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
378 | in a function. (In fact, the pthread ones have to be paired up | |
379 | syntactically, as if they might expand to a compound statement | |
380 | incorporating the user's code, and invoking a compiler's | |
381 | exception-handling primitives. Which might be something to think | |
382 | about for cases where Guile is used with C++ exceptions or | |
383 | pthread_cancel.) | |
384 | */ | |
385 | ||
9de87eea MV |
386 | scm_i_pthread_key_t scm_i_thread_key; |
387 | ||
d823b11b | 388 | static void |
9de87eea | 389 | resume (scm_i_thread *t) |
d823b11b | 390 | { |
d823b11b | 391 | t->top = NULL; |
9bc4701c MD |
392 | if (t->clear_freelists_p) |
393 | { | |
394 | *SCM_FREELIST_LOC (scm_i_freelist) = SCM_EOL; | |
395 | *SCM_FREELIST_LOC (scm_i_freelist2) = SCM_EOL; | |
396 | t->clear_freelists_p = 0; | |
397 | } | |
d823b11b MV |
398 | } |
399 | ||
98648121 MV |
400 | typedef void* scm_t_guile_ticket; |
401 | ||
402 | static void | |
9de87eea | 403 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 404 | { |
9de87eea MV |
405 | scm_i_thread *t = (scm_i_thread *)ticket; |
406 | if (t) | |
407 | { | |
408 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
409 | resume (t); | |
410 | } | |
d823b11b MV |
411 | } |
412 | ||
9de87eea MV |
413 | static scm_i_thread * |
414 | suspend (void) | |
d823b11b | 415 | { |
9de87eea | 416 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
417 | |
418 | /* record top of stack for the GC */ | |
9de87eea | 419 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
420 | /* save registers. */ |
421 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
422 | setjmp (t->regs); |
423 | return t; | |
d823b11b MV |
424 | } |
425 | ||
98648121 | 426 | static scm_t_guile_ticket |
9de87eea | 427 | scm_leave_guile () |
d823b11b | 428 | { |
9de87eea MV |
429 | scm_i_thread *t = suspend (); |
430 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
431 | return (scm_t_guile_ticket) t; | |
d823b11b MV |
432 | } |
433 | ||
9de87eea MV |
434 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
435 | static scm_i_thread *all_threads = NULL; | |
436 | static int thread_count; | |
437 | ||
438 | static SCM scm_i_default_dynamic_state; | |
439 | ||
440 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 441 | */ |
9de87eea MV |
442 | static void |
443 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 444 | { |
9de87eea MV |
445 | scm_i_thread *t = malloc (sizeof (scm_i_thread)); |
446 | ||
447 | t->pthread = scm_i_pthread_self (); | |
448 | t->handle = SCM_BOOL_F; | |
449 | t->result = SCM_BOOL_F; | |
2e77f720 | 450 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 451 | t->mutexes = SCM_EOL; |
d2a51087 | 452 | t->held_mutex = NULL; |
9de87eea MV |
453 | t->join_queue = SCM_EOL; |
454 | t->dynamic_state = SCM_BOOL_F; | |
455 | t->dynwinds = SCM_EOL; | |
456 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
457 | t->block_asyncs = 1; |
458 | t->pending_asyncs = 1; | |
459 | t->last_debug_frame = NULL; | |
460 | t->base = base; | |
346e4402 NJ |
461 | #ifdef __ia64__ |
462 | /* Calculate and store off the base of this thread's register | |
463 | backing store (RBS). Unfortunately our implementation(s) of | |
464 | scm_ia64_register_backing_store_base are only reliable for the | |
465 | main thread. For other threads, therefore, find out the current | |
466 | top of the RBS, and use that as a maximum. */ | |
467 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
468 | { | |
469 | ucontext_t ctx; | |
470 | void *bsp; | |
471 | getcontext (&ctx); | |
472 | bsp = scm_ia64_ar_bsp (&ctx); | |
473 | if (t->register_backing_store_base > bsp) | |
474 | t->register_backing_store_base = bsp; | |
475 | } | |
476 | #endif | |
0c97d7dd | 477 | t->continuation_root = SCM_EOL; |
9de87eea MV |
478 | t->continuation_base = base; |
479 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
480 | t->sleep_mutex = NULL; | |
481 | t->sleep_object = SCM_BOOL_F; | |
482 | t->sleep_fd = -1; | |
0c97d7dd | 483 | /* XXX - check for errors. */ |
9de87eea MV |
484 | pipe (t->sleep_pipe); |
485 | scm_i_pthread_mutex_init (&t->heap_mutex, NULL); | |
86a597f8 | 486 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
9de87eea | 487 | t->clear_freelists_p = 0; |
1a8fdd7e | 488 | t->gc_running_p = 0; |
2e77f720 | 489 | t->canceled = 0; |
9de87eea MV |
490 | t->exited = 0; |
491 | ||
492 | t->freelist = SCM_EOL; | |
493 | t->freelist2 = SCM_EOL; | |
494 | SCM_SET_FREELIST_LOC (scm_i_freelist, &t->freelist); | |
495 | SCM_SET_FREELIST_LOC (scm_i_freelist2, &t->freelist2); | |
496 | ||
497 | scm_i_pthread_setspecific (scm_i_thread_key, t); | |
498 | ||
499 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
500 | ||
501 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
502 | t->next_thread = all_threads; | |
503 | all_threads = t; | |
504 | thread_count++; | |
505 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
506 | } |
507 | ||
9de87eea | 508 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 509 | */ |
9de87eea MV |
510 | static void |
511 | guilify_self_2 (SCM parent) | |
d823b11b | 512 | { |
9de87eea MV |
513 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
514 | ||
515 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); | |
516 | scm_gc_register_collectable_memory (t, sizeof (scm_i_thread), "thread"); | |
517 | t->continuation_root = scm_cons (t->handle, SCM_EOL); | |
518 | t->continuation_base = t->base; | |
519 | ||
520 | if (scm_is_true (parent)) | |
521 | t->dynamic_state = scm_make_dynamic_state (parent); | |
522 | else | |
523 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
524 | ||
525 | t->join_queue = make_queue (); | |
526 | t->block_asyncs = 0; | |
d823b11b MV |
527 | } |
528 | ||
6180e336 NJ |
529 | \f |
530 | /*** Fat mutexes */ | |
531 | ||
532 | /* We implement our own mutex type since we want them to be 'fair', we | |
533 | want to do fancy things while waiting for them (like running | |
534 | asyncs) and we might want to add things that are nice for | |
535 | debugging. | |
536 | */ | |
537 | ||
538 | typedef struct { | |
539 | scm_i_pthread_mutex_t lock; | |
540 | SCM owner; | |
adc085f1 | 541 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 542 | |
adc085f1 | 543 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
544 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
545 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
546 | owned by the current thread? */ | |
547 | ||
548 | SCM waiting; /* the threads waiting for this mutex. */ | |
549 | } fat_mutex; | |
550 | ||
551 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
552 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
553 | ||
9de87eea | 554 | /* Perform thread tear-down, in guile mode. |
d823b11b | 555 | */ |
9de87eea MV |
556 | static void * |
557 | do_thread_exit (void *v) | |
558 | { | |
2e77f720 LC |
559 | scm_i_thread *t = (scm_i_thread *) v; |
560 | ||
561 | if (!scm_is_false (t->cleanup_handler)) | |
562 | { | |
563 | SCM ptr = t->cleanup_handler; | |
564 | ||
565 | t->cleanup_handler = SCM_BOOL_F; | |
566 | t->result = scm_internal_catch (SCM_BOOL_T, | |
567 | (scm_t_catch_body) scm_call_0, ptr, | |
568 | scm_handle_by_message_noexit, NULL); | |
569 | } | |
9de87eea | 570 | |
86a597f8 | 571 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
572 | |
573 | t->exited = 1; | |
0c97d7dd MV |
574 | close (t->sleep_pipe[0]); |
575 | close (t->sleep_pipe[1]); | |
9de87eea MV |
576 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
577 | ; | |
9de87eea | 578 | |
74926120 | 579 | while (!scm_is_null (t->mutexes)) |
6180e336 NJ |
580 | { |
581 | SCM mutex = SCM_CAR (t->mutexes); | |
582 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
583 | scm_i_pthread_mutex_lock (&m->lock); | |
74926120 | 584 | |
6180e336 NJ |
585 | unblock_from_queue (m->waiting); |
586 | ||
74926120 | 587 | scm_i_pthread_mutex_unlock (&m->lock); |
6180e336 NJ |
588 | t->mutexes = SCM_CDR (t->mutexes); |
589 | } | |
590 | ||
86a597f8 | 591 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 592 | |
9de87eea MV |
593 | return NULL; |
594 | } | |
595 | ||
d823b11b | 596 | static void |
9de87eea | 597 | on_thread_exit (void *v) |
d823b11b | 598 | { |
29776e85 | 599 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 600 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 601 | |
d2a51087 NJ |
602 | /* If this thread was cancelled while doing a cond wait, it will |
603 | still have a mutex locked, so we unlock it here. */ | |
604 | if (t->held_mutex) | |
605 | { | |
606 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
607 | t->held_mutex = NULL; | |
608 | } | |
609 | ||
9de87eea | 610 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 611 | |
2e77f720 LC |
612 | /* Ensure the signal handling thread has been launched, because we might be |
613 | shutting it down. */ | |
614 | scm_i_ensure_signal_delivery_thread (); | |
615 | ||
0c97d7dd | 616 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 617 | since the queue is a SCM data structure. */ |
9de87eea | 618 | scm_with_guile (do_thread_exit, v); |
0c97d7dd MV |
619 | |
620 | /* Removing ourself from the list of all threads needs to happen in | |
621 | non-guile mode since all SCM values on our stack become | |
29776e85 | 622 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
623 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
624 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
625 | if (*tp == t) | |
626 | { | |
627 | *tp = t->next_thread; | |
628 | break; | |
629 | } | |
630 | thread_count--; | |
2e77f720 LC |
631 | |
632 | /* If there's only one other thread, it could be the signal delivery | |
633 | thread, so we need to notify it to shut down by closing its read pipe. | |
634 | If it's not the signal delivery thread, then closing the read pipe isn't | |
635 | going to hurt. */ | |
636 | if (thread_count <= 1) | |
637 | scm_i_close_signal_pipe (); | |
638 | ||
0c97d7dd MV |
639 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
640 | ||
9de87eea | 641 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
642 | } |
643 | ||
9de87eea | 644 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 645 | |
9de87eea MV |
646 | static void |
647 | init_thread_key (void) | |
648 | { | |
649 | scm_i_pthread_key_create (&scm_i_thread_key, on_thread_exit); | |
650 | } | |
d823b11b | 651 | |
9de87eea MV |
652 | /* Perform any initializations necessary to bring the current thread |
653 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 654 | |
9de87eea MV |
655 | BASE is the stack base to use with GC. |
656 | ||
657 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
658 | which case the default dynamic state is used. | |
659 | ||
660 | Return zero when the thread was in guile mode already; otherwise | |
661 | return 1. | |
662 | */ | |
663 | ||
664 | static int | |
665 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 666 | { |
9de87eea MV |
667 | scm_i_thread *t; |
668 | ||
669 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
670 | ||
671 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
672 | { | |
673 | /* This thread has not been guilified yet. | |
674 | */ | |
675 | ||
676 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
677 | if (scm_initialized_p == 0) | |
678 | { | |
679 | /* First thread ever to enter Guile. Run the full | |
680 | initialization. | |
681 | */ | |
682 | scm_i_init_guile (base); | |
683 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
684 | } | |
685 | else | |
686 | { | |
687 | /* Guile is already initialized, but this thread enters it for | |
688 | the first time. Only initialize this thread. | |
689 | */ | |
690 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
691 | guilify_self_1 (base); | |
692 | guilify_self_2 (parent); | |
693 | } | |
694 | return 1; | |
695 | } | |
696 | else if (t->top) | |
697 | { | |
698 | /* This thread is already guilified but not in guile mode, just | |
699 | resume it. | |
74926120 | 700 | |
9de87eea MV |
701 | XXX - base might be lower than when this thread was first |
702 | guilified. | |
703 | */ | |
704 | scm_enter_guile ((scm_t_guile_ticket) t); | |
705 | return 1; | |
706 | } | |
707 | else | |
708 | { | |
709 | /* Thread is already in guile mode. Nothing to do. | |
710 | */ | |
711 | return 0; | |
712 | } | |
d823b11b MV |
713 | } |
714 | ||
9de87eea | 715 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 716 | |
23d72566 KR |
717 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
718 | /* This method for GNU/Linux and perhaps some other systems. | |
719 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
720 | available on them. */ | |
9de87eea MV |
721 | #define HAVE_GET_THREAD_STACK_BASE |
722 | ||
723 | static SCM_STACKITEM * | |
724 | get_thread_stack_base () | |
d823b11b | 725 | { |
9de87eea MV |
726 | pthread_attr_t attr; |
727 | void *start, *end; | |
728 | size_t size; | |
729 | ||
9de87eea MV |
730 | pthread_getattr_np (pthread_self (), &attr); |
731 | pthread_attr_getstack (&attr, &start, &size); | |
732 | end = (char *)start + size; | |
733 | ||
2b829bbb KR |
734 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
735 | for the main thread, but we can use scm_get_stack_base in that | |
736 | case. | |
737 | */ | |
738 | ||
739 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 740 | if ((void *)&attr < start || (void *)&attr >= end) |
2b829bbb | 741 | return scm_get_stack_base (); |
9de87eea | 742 | else |
2b829bbb | 743 | #endif |
9de87eea MV |
744 | { |
745 | #if SCM_STACK_GROWS_UP | |
746 | return start; | |
747 | #else | |
748 | return end; | |
749 | #endif | |
750 | } | |
a54a94b3 MV |
751 | } |
752 | ||
23d72566 KR |
753 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
754 | /* This method for MacOS X. | |
755 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
756 | but as of 2006 there's nothing obvious at apple.com. */ | |
757 | #define HAVE_GET_THREAD_STACK_BASE | |
758 | static SCM_STACKITEM * | |
759 | get_thread_stack_base () | |
760 | { | |
761 | return pthread_get_stackaddr_np (pthread_self ()); | |
762 | } | |
763 | ||
764 | #elif defined (__MINGW32__) | |
765 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
766 | in any thread. We don't like hard-coding the name of a system, but there | |
767 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
768 | work. */ | |
769 | #define HAVE_GET_THREAD_STACK_BASE | |
770 | static SCM_STACKITEM * | |
771 | get_thread_stack_base () | |
772 | { | |
773 | return scm_get_stack_base (); | |
774 | } | |
775 | ||
776 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
777 | |
778 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
779 | ||
780 | #define HAVE_GET_THREAD_STACK_BASE | |
781 | ||
782 | static SCM_STACKITEM * | |
783 | get_thread_stack_base () | |
a54a94b3 | 784 | { |
2b829bbb | 785 | return scm_get_stack_base (); |
d823b11b MV |
786 | } |
787 | ||
9de87eea | 788 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
789 | |
790 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
791 | ||
792 | void | |
793 | scm_init_guile () | |
d823b11b | 794 | { |
9de87eea MV |
795 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
796 | scm_i_default_dynamic_state); | |
d823b11b MV |
797 | } |
798 | ||
9de87eea MV |
799 | #endif |
800 | ||
801 | void * | |
802 | scm_with_guile (void *(*func)(void *), void *data) | |
803 | { | |
804 | return scm_i_with_guile_and_parent (func, data, | |
805 | scm_i_default_dynamic_state); | |
806 | } | |
807 | ||
70eca635 | 808 | SCM_UNUSED static void |
2e77f720 LC |
809 | scm_leave_guile_cleanup (void *x) |
810 | { | |
811 | scm_leave_guile (); | |
812 | } | |
813 | ||
9de87eea | 814 | void * |
2e77f720 | 815 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
816 | { |
817 | void *res; | |
818 | int really_entered; | |
819 | SCM_STACKITEM base_item; | |
2e77f720 | 820 | |
9de87eea | 821 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 822 | if (really_entered) |
2e77f720 LC |
823 | { |
824 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
825 | res = scm_c_with_continuation_barrier (func, data); | |
826 | scm_i_pthread_cleanup_pop (0); | |
827 | scm_leave_guile (); | |
828 | } | |
74926120 | 829 | else |
2e77f720 LC |
830 | res = scm_c_with_continuation_barrier (func, data); |
831 | ||
9de87eea MV |
832 | return res; |
833 | } | |
834 | ||
835 | void * | |
836 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 837 | { |
9de87eea MV |
838 | void *res; |
839 | scm_t_guile_ticket t; | |
840 | t = scm_leave_guile (); | |
841 | res = func (data); | |
842 | scm_enter_guile (t); | |
843 | return res; | |
844 | } | |
845 | ||
846 | /*** Thread creation */ | |
847 | ||
848 | typedef struct { | |
849 | SCM parent; | |
850 | SCM thunk; | |
851 | SCM handler; | |
76da80e7 | 852 | SCM thread; |
9de87eea MV |
853 | scm_i_pthread_mutex_t mutex; |
854 | scm_i_pthread_cond_t cond; | |
855 | } launch_data; | |
d823b11b | 856 | |
9de87eea MV |
857 | static void * |
858 | really_launch (void *d) | |
859 | { | |
860 | launch_data *data = (launch_data *)d; | |
861 | SCM thunk = data->thunk, handler = data->handler; | |
862 | scm_i_thread *t; | |
d823b11b | 863 | |
9de87eea | 864 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 865 | |
9de87eea MV |
866 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
867 | data->thread = scm_current_thread (); | |
868 | scm_i_pthread_cond_signal (&data->cond); | |
869 | scm_i_pthread_mutex_unlock (&data->mutex); | |
870 | ||
871 | if (SCM_UNBNDP (handler)) | |
872 | t->result = scm_call_0 (thunk); | |
873 | else | |
874 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
875 | ||
876 | return 0; | |
d823b11b MV |
877 | } |
878 | ||
9de87eea MV |
879 | static void * |
880 | launch_thread (void *d) | |
881 | { | |
882 | launch_data *data = (launch_data *)d; | |
883 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
884 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
885 | return NULL; | |
886 | } | |
887 | ||
888 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 889 | (SCM thunk, SCM handler), |
9de87eea MV |
890 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
891 | "returning a new thread object representing the thread. The procedure\n" | |
892 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
893 | "\n" | |
894 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
895 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
896 | "handler. This catch is established inside the continuation barrier.\n" | |
897 | "\n" | |
898 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
899 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
900 | #define FUNC_NAME s_scm_call_with_new_thread |
901 | { | |
9de87eea MV |
902 | launch_data data; |
903 | scm_i_pthread_t id; | |
904 | int err; | |
d823b11b | 905 | |
9de87eea MV |
906 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
907 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
908 | handler, SCM_ARG2, FUNC_NAME); | |
909 | ||
910 | data.parent = scm_current_dynamic_state (); | |
911 | data.thunk = thunk; | |
912 | data.handler = handler; | |
913 | data.thread = SCM_BOOL_F; | |
914 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
915 | scm_i_pthread_cond_init (&data.cond, NULL); | |
916 | ||
917 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
918 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
919 | if (err) | |
920 | { | |
921 | scm_i_pthread_mutex_unlock (&data.mutex); | |
922 | errno = err; | |
923 | scm_syserror (NULL); | |
924 | } | |
925 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
926 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 927 | |
9de87eea | 928 | return data.thread; |
d823b11b MV |
929 | } |
930 | #undef FUNC_NAME | |
931 | ||
9de87eea MV |
932 | typedef struct { |
933 | SCM parent; | |
934 | scm_t_catch_body body; | |
935 | void *body_data; | |
936 | scm_t_catch_handler handler; | |
937 | void *handler_data; | |
938 | SCM thread; | |
939 | scm_i_pthread_mutex_t mutex; | |
940 | scm_i_pthread_cond_t cond; | |
941 | } spawn_data; | |
942 | ||
943 | static void * | |
944 | really_spawn (void *d) | |
945 | { | |
946 | spawn_data *data = (spawn_data *)d; | |
947 | scm_t_catch_body body = data->body; | |
948 | void *body_data = data->body_data; | |
949 | scm_t_catch_handler handler = data->handler; | |
950 | void *handler_data = data->handler_data; | |
951 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
952 | ||
953 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
954 | data->thread = scm_current_thread (); | |
955 | scm_i_pthread_cond_signal (&data->cond); | |
956 | scm_i_pthread_mutex_unlock (&data->mutex); | |
957 | ||
958 | if (handler == NULL) | |
959 | t->result = body (body_data); | |
960 | else | |
961 | t->result = scm_internal_catch (SCM_BOOL_T, | |
962 | body, body_data, | |
963 | handler, handler_data); | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | static void * | |
969 | spawn_thread (void *d) | |
970 | { | |
971 | spawn_data *data = (spawn_data *)d; | |
972 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
973 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
974 | return NULL; | |
975 | } | |
976 | ||
977 | SCM | |
978 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
979 | scm_t_catch_handler handler, void *handler_data) | |
980 | { | |
981 | spawn_data data; | |
982 | scm_i_pthread_t id; | |
983 | int err; | |
984 | ||
985 | data.parent = scm_current_dynamic_state (); | |
986 | data.body = body; | |
987 | data.body_data = body_data; | |
988 | data.handler = handler; | |
989 | data.handler_data = handler_data; | |
990 | data.thread = SCM_BOOL_F; | |
991 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
992 | scm_i_pthread_cond_init (&data.cond, NULL); | |
993 | ||
994 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
995 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
996 | if (err) | |
997 | { | |
998 | scm_i_pthread_mutex_unlock (&data.mutex); | |
999 | errno = err; | |
1000 | scm_syserror (NULL); | |
1001 | } | |
1002 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1003 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1004 | |
9de87eea MV |
1005 | return data.thread; |
1006 | } | |
1007 | ||
29717c89 MD |
1008 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1009 | (), | |
1010 | "Move the calling thread to the end of the scheduling queue.") | |
1011 | #define FUNC_NAME s_scm_yield | |
1012 | { | |
9de87eea | 1013 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1014 | } |
1015 | #undef FUNC_NAME | |
1016 | ||
2e77f720 LC |
1017 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1018 | (SCM thread), | |
1019 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1020 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1021 | "been signaled to terminate, this function is a no-op.") | |
1022 | #define FUNC_NAME s_scm_cancel_thread | |
1023 | { | |
1024 | scm_i_thread *t = NULL; | |
1025 | ||
1026 | SCM_VALIDATE_THREAD (1, thread); | |
1027 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1028 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1029 | if (!t->canceled) |
1030 | { | |
1031 | t->canceled = 1; | |
86a597f8 | 1032 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1033 | scm_i_pthread_cancel (t->pthread); |
1034 | } | |
1035 | else | |
86a597f8 | 1036 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1037 | |
1038 | return SCM_UNSPECIFIED; | |
1039 | } | |
1040 | #undef FUNC_NAME | |
1041 | ||
1042 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1043 | (SCM thread, SCM proc), | |
1044 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1045 | "This handler will be called when the thread exits.") | |
1046 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1047 | { | |
1048 | scm_i_thread *t; | |
1049 | ||
1050 | SCM_VALIDATE_THREAD (1, thread); | |
1051 | if (!scm_is_false (proc)) | |
1052 | SCM_VALIDATE_THUNK (2, proc); | |
1053 | ||
2e77f720 | 1054 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1055 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1056 | ||
2e77f720 LC |
1057 | if (!(t->exited || t->canceled)) |
1058 | t->cleanup_handler = proc; | |
1059 | ||
86a597f8 | 1060 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1061 | |
1062 | return SCM_UNSPECIFIED; | |
1063 | } | |
1064 | #undef FUNC_NAME | |
1065 | ||
1066 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1067 | (SCM thread), | |
1068 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1069 | #define FUNC_NAME s_scm_thread_cleanup | |
1070 | { | |
1071 | scm_i_thread *t; | |
1072 | SCM ret; | |
1073 | ||
1074 | SCM_VALIDATE_THREAD (1, thread); | |
1075 | ||
2e77f720 | 1076 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1077 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1078 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1079 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1080 | |
1081 | return ret; | |
1082 | } | |
1083 | #undef FUNC_NAME | |
1084 | ||
6180e336 NJ |
1085 | SCM scm_join_thread (SCM thread) |
1086 | { | |
1087 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1088 | } | |
1089 | ||
1090 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1091 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1092 | "Suspend execution of the calling thread until the target @var{thread} " |
1093 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1094 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1095 | { |
9de87eea | 1096 | scm_i_thread *t; |
6180e336 NJ |
1097 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1098 | SCM res = SCM_BOOL_F; | |
1099 | ||
1100 | if (! (SCM_UNBNDP (timeoutval))) | |
1101 | res = timeoutval; | |
d823b11b MV |
1102 | |
1103 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1104 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1105 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1106 | |
9de87eea | 1107 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1108 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1109 | ||
6180e336 NJ |
1110 | if (! SCM_UNBNDP (timeout)) |
1111 | { | |
1112 | to_timespec (timeout, &ctimeout); | |
1113 | timeout_ptr = &ctimeout; | |
1114 | } | |
1115 | ||
1116 | if (t->exited) | |
1117 | res = t->result; | |
1118 | else | |
d823b11b | 1119 | { |
9de87eea MV |
1120 | while (1) |
1121 | { | |
74926120 | 1122 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1123 | timeout_ptr); |
1124 | if (err == 0) | |
1125 | { | |
1126 | if (t->exited) | |
1127 | { | |
1128 | res = t->result; | |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | else if (err == ETIMEDOUT) | |
9de87eea | 1133 | break; |
6180e336 | 1134 | |
86a597f8 | 1135 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1136 | SCM_TICK; |
86a597f8 | 1137 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea | 1138 | } |
d823b11b | 1139 | } |
9de87eea | 1140 | |
86a597f8 | 1141 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1142 | |
d823b11b | 1143 | return res; |
5f05c406 MV |
1144 | } |
1145 | #undef FUNC_NAME | |
1146 | ||
6180e336 NJ |
1147 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1148 | (SCM obj), | |
1149 | "Return @code{#t} if @var{obj} is a thread.") | |
1150 | #define FUNC_NAME s_scm_thread_p | |
1151 | { | |
1152 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1153 | } | |
1154 | #undef FUNC_NAME | |
5f05c406 | 1155 | |
d823b11b | 1156 | static SCM |
9de87eea | 1157 | fat_mutex_mark (SCM mx) |
d823b11b | 1158 | { |
9de87eea | 1159 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
d823b11b MV |
1160 | scm_gc_mark (m->owner); |
1161 | return m->waiting; | |
1162 | } | |
4079f87e | 1163 | |
9de87eea MV |
1164 | static size_t |
1165 | fat_mutex_free (SCM mx) | |
76da80e7 | 1166 | { |
9de87eea MV |
1167 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1168 | scm_i_pthread_mutex_destroy (&m->lock); | |
1169 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1170 | return 0; |
1171 | } | |
1172 | ||
1173 | static int | |
9de87eea | 1174 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1175 | { |
9de87eea MV |
1176 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1177 | scm_puts ("#<mutex ", port); | |
1178 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1179 | scm_puts (">", port); | |
1180 | return 1; | |
76da80e7 MV |
1181 | } |
1182 | ||
76da80e7 | 1183 | static SCM |
6180e336 | 1184 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1185 | { |
9de87eea MV |
1186 | fat_mutex *m; |
1187 | SCM mx; | |
1188 | ||
1189 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1190 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1191 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1192 | m->level = 0; |
6180e336 | 1193 | |
adc085f1 | 1194 | m->recursive = recursive; |
6180e336 NJ |
1195 | m->unchecked_unlock = unchecked_unlock; |
1196 | m->allow_external_unlock = external_unlock; | |
1197 | ||
9de87eea MV |
1198 | m->waiting = SCM_EOL; |
1199 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1200 | m->waiting = make_queue (); | |
1201 | return mx; | |
76da80e7 MV |
1202 | } |
1203 | ||
6180e336 NJ |
1204 | SCM scm_make_mutex (void) |
1205 | { | |
1206 | return scm_make_mutex_with_flags (SCM_EOL); | |
1207 | } | |
1208 | ||
2a1d0688 NJ |
1209 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1210 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1211 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1212 | |
1213 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1214 | (SCM flags), | |
9de87eea | 1215 | "Create a new mutex. ") |
6180e336 | 1216 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1217 | { |
6180e336 NJ |
1218 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1219 | ||
1220 | SCM ptr = flags; | |
1221 | while (! scm_is_null (ptr)) | |
1222 | { | |
1223 | SCM flag = SCM_CAR (ptr); | |
1224 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1225 | unchecked_unlock = 1; | |
1226 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1227 | external_unlock = 1; | |
1228 | else if (scm_is_eq (flag, recursive_sym)) | |
1229 | recursive = 1; | |
74926120 | 1230 | else |
2a1d0688 | 1231 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1232 | ptr = SCM_CDR (ptr); |
1233 | } | |
1234 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1235 | } |
1236 | #undef FUNC_NAME | |
1237 | ||
9de87eea | 1238 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1239 | (void), |
9de87eea MV |
1240 | "Create a new recursive mutex. ") |
1241 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1242 | { |
6180e336 | 1243 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1244 | } |
1245 | #undef FUNC_NAME | |
1246 | ||
6180e336 NJ |
1247 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1248 | ||
1249 | static SCM | |
adc085f1 | 1250 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1251 | { |
1252 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1253 | |
adc085f1 | 1254 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1255 | SCM err = SCM_BOOL_F; |
1256 | ||
1257 | struct timeval current_time; | |
9de87eea MV |
1258 | |
1259 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1260 | |
1261 | while (1) | |
9de87eea | 1262 | { |
adc085f1 | 1263 | if (m->level == 0) |
6180e336 | 1264 | { |
adc085f1 | 1265 | m->owner = new_owner; |
6180e336 | 1266 | m->level++; |
74926120 | 1267 | |
adc085f1 | 1268 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1269 | { |
adc085f1 | 1270 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 NJ |
1271 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1272 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1273 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
6180e336 | 1274 | } |
adc085f1 JG |
1275 | *ret = 1; |
1276 | break; | |
1277 | } | |
1278 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1279 | { | |
1280 | m->owner = new_owner; | |
1281 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1282 | scm_from_locale_string ("lock obtained on abandoned " | |
1283 | "mutex")); | |
1284 | *ret = 1; | |
1285 | break; | |
1286 | } | |
1287 | else if (scm_is_eq (m->owner, new_owner)) | |
1288 | { | |
1289 | if (m->recursive) | |
1290 | { | |
1291 | m->level++; | |
74926120 | 1292 | *ret = 1; |
adc085f1 JG |
1293 | } |
1294 | else | |
6180e336 | 1295 | { |
adc085f1 JG |
1296 | err = scm_cons (scm_misc_error_key, |
1297 | scm_from_locale_string ("mutex already locked " | |
1298 | "by thread")); | |
1299 | *ret = 0; | |
1300 | } | |
74926120 | 1301 | break; |
adc085f1 JG |
1302 | } |
1303 | else | |
1304 | { | |
74926120 | 1305 | if (timeout != NULL) |
adc085f1 JG |
1306 | { |
1307 | gettimeofday (¤t_time, NULL); | |
1308 | if (current_time.tv_sec > timeout->tv_sec || | |
1309 | (current_time.tv_sec == timeout->tv_sec && | |
1310 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1311 | { |
adc085f1 JG |
1312 | *ret = 0; |
1313 | break; | |
6180e336 | 1314 | } |
6180e336 | 1315 | } |
37a52039 | 1316 | block_self (m->waiting, mutex, &m->lock, timeout); |
adc085f1 JG |
1317 | scm_i_pthread_mutex_unlock (&m->lock); |
1318 | SCM_TICK; | |
1319 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
9de87eea MV |
1320 | } |
1321 | } | |
1322 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1323 | return err; |
9de87eea MV |
1324 | } |
1325 | ||
6180e336 NJ |
1326 | SCM scm_lock_mutex (SCM mx) |
1327 | { | |
adc085f1 | 1328 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1329 | } |
1330 | ||
adc085f1 JG |
1331 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1332 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1333 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1334 | "blocks until the mutex becomes available. The function returns when " | |
1335 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1336 | "a thread already owns will succeed right away and will not block the " | |
1337 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1338 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1339 | { |
6180e336 NJ |
1340 | SCM exception; |
1341 | int ret = 0; | |
1342 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1343 | |
6180e336 NJ |
1344 | SCM_VALIDATE_MUTEX (1, m); |
1345 | ||
1346 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1347 | { | |
1348 | to_timespec (timeout, &cwaittime); | |
1349 | waittime = &cwaittime; | |
1350 | } | |
1351 | ||
adc085f1 | 1352 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1353 | if (!scm_is_false (exception)) |
1354 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1355 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1356 | } |
76da80e7 | 1357 | #undef FUNC_NAME |
9bc4701c | 1358 | |
a4d106c7 | 1359 | void |
661ae7ab | 1360 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1361 | { |
661ae7ab MV |
1362 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1363 | SCM_F_WIND_EXPLICITLY); | |
1364 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1365 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1366 | } |
1367 | ||
9bc4701c | 1368 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1369 | (SCM mutex), |
9bc4701c MD |
1370 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1371 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1372 | #define FUNC_NAME s_scm_try_mutex | |
1373 | { | |
6180e336 NJ |
1374 | SCM exception; |
1375 | int ret = 0; | |
1376 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1377 | |
ba1b7223 | 1378 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1379 | |
1380 | to_timespec (scm_from_int(0), &cwaittime); | |
1381 | waittime = &cwaittime; | |
74926120 | 1382 | |
adc085f1 | 1383 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1384 | if (!scm_is_false (exception)) |
1385 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1386 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1387 | } |
1388 | #undef FUNC_NAME | |
76da80e7 | 1389 | |
6180e336 NJ |
1390 | /*** Fat condition variables */ |
1391 | ||
1392 | typedef struct { | |
1393 | scm_i_pthread_mutex_t lock; | |
1394 | SCM waiting; /* the threads waiting for this condition. */ | |
1395 | } fat_cond; | |
1396 | ||
1397 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1398 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1399 | ||
1400 | static int | |
1401 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1402 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1403 | { |
6180e336 NJ |
1404 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1405 | fat_cond *c = NULL; | |
1406 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1407 | int err = 0, ret = 0; | |
9de87eea MV |
1408 | |
1409 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1410 | |
1411 | SCM owner = m->owner; | |
1412 | ||
1413 | if (!scm_is_eq (owner, scm_current_thread ())) | |
9bc4701c | 1414 | { |
adc085f1 | 1415 | if (m->level == 0) |
6180e336 NJ |
1416 | { |
1417 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1418 | { |
1419 | scm_i_pthread_mutex_unlock (&m->lock); | |
1420 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1421 | } | |
adc085f1 | 1422 | owner = scm_current_thread (); |
6180e336 NJ |
1423 | } |
1424 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1425 | { |
1426 | scm_i_pthread_mutex_unlock (&m->lock); | |
1427 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1428 | } | |
6180e336 NJ |
1429 | } |
1430 | ||
1431 | if (! (SCM_UNBNDP (cond))) | |
1432 | { | |
6180e336 NJ |
1433 | c = SCM_CONDVAR_DATA (cond); |
1434 | while (1) | |
1435 | { | |
1436 | int brk = 0; | |
1437 | ||
6180e336 NJ |
1438 | if (m->level > 0) |
1439 | m->level--; | |
adc085f1 | 1440 | if (m->level == 0) |
6180e336 | 1441 | m->owner = unblock_from_queue (m->waiting); |
adc085f1 | 1442 | |
6180e336 | 1443 | t->block_asyncs++; |
74926120 | 1444 | |
d2a51087 NJ |
1445 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1446 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1447 | |
1448 | if (err == 0) | |
1449 | { | |
1450 | ret = 1; | |
1451 | brk = 1; | |
1452 | } | |
1453 | else if (err == ETIMEDOUT) | |
1454 | { | |
1455 | ret = 0; | |
1456 | brk = 1; | |
1457 | } | |
1458 | else if (err != EINTR) | |
74926120 | 1459 | { |
6180e336 | 1460 | errno = err; |
6180e336 | 1461 | scm_syserror (NULL); |
74926120 | 1462 | } |
6180e336 NJ |
1463 | |
1464 | if (brk) | |
1465 | { | |
1466 | if (relock) | |
adc085f1 | 1467 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
6180e336 NJ |
1468 | break; |
1469 | } | |
74926120 | 1470 | |
6180e336 NJ |
1471 | t->block_asyncs--; |
1472 | scm_async_click (); | |
74926120 | 1473 | |
6180e336 NJ |
1474 | scm_remember_upto_here_2 (cond, mutex); |
1475 | ||
1476 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1477 | } | |
9bc4701c | 1478 | } |
9de87eea | 1479 | else |
6180e336 NJ |
1480 | { |
1481 | if (m->level > 0) | |
1482 | m->level--; | |
74926120 | 1483 | if (m->level == 0) |
6180e336 | 1484 | m->owner = unblock_from_queue (m->waiting); |
74926120 | 1485 | |
6180e336 NJ |
1486 | scm_i_pthread_mutex_unlock (&m->lock); |
1487 | ret = 1; | |
1488 | } | |
74926120 | 1489 | |
6180e336 NJ |
1490 | return ret; |
1491 | } | |
9de87eea | 1492 | |
6180e336 NJ |
1493 | SCM scm_unlock_mutex (SCM mx) |
1494 | { | |
1495 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1496 | } |
9bc4701c | 1497 | |
6180e336 NJ |
1498 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1499 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1500 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1501 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1502 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1503 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1504 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1505 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1506 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1507 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1508 | { |
6180e336 NJ |
1509 | scm_t_timespec cwaittime, *waittime = NULL; |
1510 | ||
9bc4701c | 1511 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1512 | if (! (SCM_UNBNDP (cond))) |
1513 | { | |
1514 | SCM_VALIDATE_CONDVAR (2, cond); | |
1515 | ||
1516 | if (! (SCM_UNBNDP (timeout))) | |
1517 | { | |
1518 | to_timespec (timeout, &cwaittime); | |
1519 | waittime = &cwaittime; | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1524 | } |
1525 | #undef FUNC_NAME | |
1526 | ||
6180e336 NJ |
1527 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1528 | (SCM obj), | |
1529 | "Return @code{#t} if @var{obj} is a mutex.") | |
1530 | #define FUNC_NAME s_scm_mutex_p | |
1531 | { | |
1532 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1533 | } | |
74926120 | 1534 | #undef FUNC_NAME |
6180e336 | 1535 | |
9de87eea MV |
1536 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, |
1537 | (SCM mx), | |
1538 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1539 | #define FUNC_NAME s_scm_mutex_owner | |
1540 | { | |
adc085f1 JG |
1541 | SCM owner; |
1542 | fat_mutex *m = NULL; | |
1543 | ||
9de87eea | 1544 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1545 | m = SCM_MUTEX_DATA (mx); |
1546 | scm_i_pthread_mutex_lock (&m->lock); | |
1547 | owner = m->owner; | |
1548 | scm_i_pthread_mutex_unlock (&m->lock); | |
1549 | ||
1550 | return owner; | |
9de87eea MV |
1551 | } |
1552 | #undef FUNC_NAME | |
1553 | ||
1554 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1555 | (SCM mx), | |
adc085f1 | 1556 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1557 | #define FUNC_NAME s_scm_mutex_level |
1558 | { | |
1559 | SCM_VALIDATE_MUTEX (1, mx); | |
1560 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1561 | } | |
1562 | #undef FUNC_NAME | |
1563 | ||
adc085f1 JG |
1564 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1565 | (SCM mx), | |
1566 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1567 | #define FUNC_NAME s_scm_mutex_locked_p | |
1568 | { | |
1569 | SCM_VALIDATE_MUTEX (1, mx); | |
1570 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1571 | } | |
1572 | #undef FUNC_NAME | |
9de87eea | 1573 | |
9de87eea MV |
1574 | static SCM |
1575 | fat_cond_mark (SCM cv) | |
1576 | { | |
1577 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1578 | return c->waiting; | |
1579 | } | |
1580 | ||
1581 | static size_t | |
1582 | fat_cond_free (SCM mx) | |
1583 | { | |
1584 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
9de87eea MV |
1585 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); |
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | static int | |
1590 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1591 | { | |
1592 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1593 | scm_puts ("#<condition-variable ", port); | |
1594 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1595 | scm_puts (">", port); | |
1596 | return 1; | |
1597 | } | |
9bc4701c | 1598 | |
d823b11b MV |
1599 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1600 | (void), | |
1601 | "Make a new condition variable.") | |
1602 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1603 | { |
9de87eea MV |
1604 | fat_cond *c; |
1605 | SCM cv; | |
1606 | ||
1607 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1608 | c->waiting = SCM_EOL; |
1609 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1610 | c->waiting = make_queue (); | |
d823b11b | 1611 | return cv; |
5f05c406 | 1612 | } |
d823b11b | 1613 | #undef FUNC_NAME |
5f05c406 | 1614 | |
d823b11b MV |
1615 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1616 | (SCM cv, SCM mx, SCM t), | |
1617 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1618 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1619 | "is locked again when this function returns. When @var{time} is given, " | |
1620 | "it specifies a point in time where the waiting should be aborted. It " | |
1621 | "can be either a integer as returned by @code{current-time} or a pair " | |
1622 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1623 | "mutex is locked and @code{#f} is returned. When the condition " | |
1624 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1625 | "is returned. ") | |
1626 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1627 | { |
9de87eea | 1628 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1629 | |
1630 | SCM_VALIDATE_CONDVAR (1, cv); | |
1631 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1632 | |
d823b11b MV |
1633 | if (!SCM_UNBNDP (t)) |
1634 | { | |
6180e336 | 1635 | to_timespec (t, &waittime); |
9de87eea | 1636 | waitptr = &waittime; |
d823b11b MV |
1637 | } |
1638 | ||
2a1d0688 | 1639 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1640 | } |
d823b11b | 1641 | #undef FUNC_NAME |
5f05c406 | 1642 | |
9de87eea MV |
1643 | static void |
1644 | fat_cond_signal (fat_cond *c) | |
1645 | { | |
9de87eea | 1646 | unblock_from_queue (c->waiting); |
9de87eea MV |
1647 | } |
1648 | ||
d823b11b MV |
1649 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1650 | (SCM cv), | |
1651 | "Wake up one thread that is waiting for @var{cv}") | |
1652 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1653 | { |
d823b11b | 1654 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1655 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1656 | return SCM_BOOL_T; |
5f05c406 | 1657 | } |
d823b11b | 1658 | #undef FUNC_NAME |
5f05c406 | 1659 | |
9de87eea MV |
1660 | static void |
1661 | fat_cond_broadcast (fat_cond *c) | |
1662 | { | |
9de87eea MV |
1663 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1664 | ; | |
9de87eea MV |
1665 | } |
1666 | ||
d823b11b MV |
1667 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1668 | (SCM cv), | |
1669 | "Wake up all threads that are waiting for @var{cv}. ") | |
1670 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1671 | { |
d823b11b | 1672 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1673 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1674 | return SCM_BOOL_T; |
5f05c406 | 1675 | } |
d823b11b | 1676 | #undef FUNC_NAME |
5f05c406 | 1677 | |
6180e336 NJ |
1678 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1679 | (SCM obj), | |
1680 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1681 | #define FUNC_NAME s_scm_condition_variable_p | |
1682 | { | |
1683 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1684 | } | |
1685 | #undef FUNC_NAME | |
1686 | ||
d823b11b MV |
1687 | /*** Marking stacks */ |
1688 | ||
1689 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1690 | threads as well? | |
1691 | */ | |
1692 | #ifdef __ia64__ | |
1693 | # define SCM_MARK_BACKING_STORE() do { \ | |
1694 | ucontext_t ctx; \ | |
1695 | SCM_STACKITEM * top, * bot; \ | |
1696 | getcontext (&ctx); \ | |
1697 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1698 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1699 | / sizeof (SCM_STACKITEM))); \ | |
346e4402 | 1700 | bot = (SCM_STACKITEM *) SCM_I_CURRENT_THREAD->register_backing_store_base; \ |
9a5fa6e9 | 1701 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ |
d823b11b MV |
1702 | scm_mark_locations (bot, top - bot); } while (0) |
1703 | #else | |
1704 | # define SCM_MARK_BACKING_STORE() | |
1705 | #endif | |
1706 | ||
1707 | void | |
1708 | scm_threads_mark_stacks (void) | |
5f05c406 | 1709 | { |
9de87eea MV |
1710 | scm_i_thread *t; |
1711 | for (t = all_threads; t; t = t->next_thread) | |
d823b11b | 1712 | { |
9de87eea MV |
1713 | /* Check that thread has indeed been suspended. |
1714 | */ | |
1715 | assert (t->top); | |
6087fad9 | 1716 | |
9de87eea | 1717 | scm_gc_mark (t->handle); |
6087fad9 | 1718 | |
d028af45 | 1719 | #if SCM_STACK_GROWS_UP |
9de87eea | 1720 | scm_mark_locations (t->base, t->top - t->base); |
d823b11b | 1721 | #else |
9de87eea | 1722 | scm_mark_locations (t->top, t->base - t->top); |
d823b11b | 1723 | #endif |
88cefbc7 | 1724 | scm_mark_locations ((void *) &t->regs, |
6087fad9 MV |
1725 | ((size_t) sizeof(t->regs) |
1726 | / sizeof (SCM_STACKITEM))); | |
d823b11b | 1727 | } |
59152722 MV |
1728 | |
1729 | SCM_MARK_BACKING_STORE (); | |
5f05c406 MV |
1730 | } |
1731 | ||
d823b11b MV |
1732 | /*** Select */ |
1733 | ||
911782b7 | 1734 | int |
9de87eea MV |
1735 | scm_std_select (int nfds, |
1736 | SELECT_TYPE *readfds, | |
1737 | SELECT_TYPE *writefds, | |
1738 | SELECT_TYPE *exceptfds, | |
1739 | struct timeval *timeout) | |
1740 | { | |
1741 | fd_set my_readfds; | |
1742 | int res, eno, wakeup_fd; | |
1743 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1744 | scm_t_guile_ticket ticket; | |
1745 | ||
1746 | if (readfds == NULL) | |
1747 | { | |
1748 | FD_ZERO (&my_readfds); | |
1749 | readfds = &my_readfds; | |
1750 | } | |
1751 | ||
1752 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1753 | SCM_TICK; | |
1754 | ||
1755 | wakeup_fd = t->sleep_pipe[0]; | |
1756 | ticket = scm_leave_guile (); | |
1757 | FD_SET (wakeup_fd, readfds); | |
1758 | if (wakeup_fd >= nfds) | |
1759 | nfds = wakeup_fd+1; | |
1760 | res = select (nfds, readfds, writefds, exceptfds, timeout); | |
1761 | t->sleep_fd = -1; | |
d823b11b | 1762 | eno = errno; |
9de87eea MV |
1763 | scm_enter_guile (ticket); |
1764 | ||
1765 | scm_i_reset_sleep (t); | |
1766 | ||
1767 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1768 | { | |
1769 | char dummy; | |
1770 | read (wakeup_fd, &dummy, 1); | |
1771 | FD_CLR (wakeup_fd, readfds); | |
1772 | res -= 1; | |
1773 | if (res == 0) | |
1774 | { | |
1775 | eno = EINTR; | |
1776 | res = -1; | |
1777 | } | |
1778 | } | |
d823b11b MV |
1779 | errno = eno; |
1780 | return res; | |
5f05c406 MV |
1781 | } |
1782 | ||
9de87eea | 1783 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1784 | |
9de87eea | 1785 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1786 | |
9bc4701c | 1787 | int |
9de87eea | 1788 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1789 | { |
9de87eea MV |
1790 | scm_t_guile_ticket t = scm_leave_guile (); |
1791 | int res = scm_i_pthread_mutex_lock (mutex); | |
1792 | scm_enter_guile (t); | |
9bc4701c MD |
1793 | return res; |
1794 | } | |
1795 | ||
9de87eea | 1796 | static void |
2b829bbb | 1797 | do_unlock (void *data) |
28d52ebb | 1798 | { |
9de87eea | 1799 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1800 | } |
1801 | ||
1802 | void | |
661ae7ab | 1803 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1804 | { |
9de87eea | 1805 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1806 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1807 | } |
1808 | ||
9bc4701c | 1809 | int |
9de87eea | 1810 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1811 | { |
9de87eea | 1812 | scm_t_guile_ticket t = scm_leave_guile (); |
d2a51087 | 1813 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1814 | int res = scm_i_pthread_cond_wait (cond, mutex); |
d2a51087 | 1815 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea | 1816 | scm_enter_guile (t); |
9bc4701c MD |
1817 | return res; |
1818 | } | |
9bc4701c | 1819 | |
76da80e7 | 1820 | int |
9de87eea MV |
1821 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1822 | scm_i_pthread_mutex_t *mutex, | |
1823 | const scm_t_timespec *wt) | |
76da80e7 | 1824 | { |
9de87eea | 1825 | scm_t_guile_ticket t = scm_leave_guile (); |
d2a51087 | 1826 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1827 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); |
d2a51087 | 1828 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea MV |
1829 | scm_enter_guile (t); |
1830 | return res; | |
76da80e7 MV |
1831 | } |
1832 | ||
9de87eea | 1833 | #endif |
76da80e7 | 1834 | |
d823b11b | 1835 | unsigned long |
9de87eea | 1836 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1837 | { |
d823b11b MV |
1838 | struct timeval tv; |
1839 | tv.tv_usec = usecs % 1000000; | |
1840 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1841 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1842 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1843 | } |
1844 | ||
9de87eea MV |
1845 | unsigned int |
1846 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1847 | { |
d823b11b MV |
1848 | struct timeval tv; |
1849 | tv.tv_usec = 0; | |
1850 | tv.tv_sec = secs; | |
9de87eea | 1851 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1852 | return tv.tv_sec; |
6c214b62 MD |
1853 | } |
1854 | ||
d823b11b MV |
1855 | /*** Misc */ |
1856 | ||
1857 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1858 | (void), | |
1859 | "Return the thread that called this function.") | |
1860 | #define FUNC_NAME s_scm_current_thread | |
1861 | { | |
9de87eea | 1862 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1863 | } |
1864 | #undef FUNC_NAME | |
1865 | ||
9de87eea MV |
1866 | static SCM |
1867 | scm_c_make_list (size_t n, SCM fill) | |
1868 | { | |
1869 | SCM res = SCM_EOL; | |
1870 | while (n-- > 0) | |
1871 | res = scm_cons (fill, res); | |
1872 | return res; | |
1873 | } | |
1874 | ||
d823b11b MV |
1875 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1876 | (void), | |
1877 | "Return a list of all threads.") | |
9bc4701c | 1878 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1879 | { |
9de87eea MV |
1880 | /* We can not allocate while holding the thread_admin_mutex because |
1881 | of the way GC is done. | |
1882 | */ | |
1883 | int n = thread_count; | |
1884 | scm_i_thread *t; | |
1885 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1886 | |
9de87eea MV |
1887 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1888 | l = &list; | |
1889 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1890 | { | |
2e77f720 LC |
1891 | if (t != scm_i_signal_delivery_thread) |
1892 | { | |
1893 | SCM_SETCAR (*l, t->handle); | |
1894 | l = SCM_CDRLOC (*l); | |
1895 | } | |
9de87eea MV |
1896 | n--; |
1897 | } | |
1898 | *l = SCM_EOL; | |
1899 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1900 | return list; | |
d823b11b | 1901 | } |
9de87eea | 1902 | #undef FUNC_NAME |
d823b11b MV |
1903 | |
1904 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1905 | (SCM thread), | |
1906 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1907 | #define FUNC_NAME s_scm_thread_exited_p | |
1908 | { | |
7888309b | 1909 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1910 | } |
1911 | #undef FUNC_NAME | |
1912 | ||
911782b7 | 1913 | int |
d823b11b MV |
1914 | scm_c_thread_exited_p (SCM thread) |
1915 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1916 | { |
9de87eea | 1917 | scm_i_thread *t; |
d823b11b | 1918 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1919 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1920 | return t->exited; |
5f05c406 | 1921 | } |
d823b11b | 1922 | #undef FUNC_NAME |
5f05c406 | 1923 | |
9de87eea | 1924 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c | 1925 | int scm_i_thread_go_to_sleep; |
9bc4701c MD |
1926 | static int threads_initialized_p = 0; |
1927 | ||
1928 | void | |
1929 | scm_i_thread_put_to_sleep () | |
1930 | { | |
6087fad9 | 1931 | if (threads_initialized_p) |
9bc4701c | 1932 | { |
9de87eea | 1933 | scm_i_thread *t; |
6087fad9 | 1934 | |
9de87eea MV |
1935 | scm_leave_guile (); |
1936 | scm_i_pthread_mutex_lock (&thread_admin_mutex); | |
1937 | ||
74926120 | 1938 | /* Signal all threads to go to sleep |
0c97d7dd MV |
1939 | */ |
1940 | scm_i_thread_go_to_sleep = 1; | |
1941 | for (t = all_threads; t; t = t->next_thread) | |
1942 | scm_i_pthread_mutex_lock (&t->heap_mutex); | |
1943 | scm_i_thread_go_to_sleep = 0; | |
9bc4701c MD |
1944 | } |
1945 | } | |
1946 | ||
b0dc3d71 MD |
1947 | void |
1948 | scm_i_thread_invalidate_freelists () | |
1949 | { | |
9de87eea MV |
1950 | /* thread_admin_mutex is already locked. */ |
1951 | ||
1952 | scm_i_thread *t; | |
1953 | for (t = all_threads; t; t = t->next_thread) | |
1954 | if (t != SCM_I_CURRENT_THREAD) | |
1955 | t->clear_freelists_p = 1; | |
b0dc3d71 MD |
1956 | } |
1957 | ||
9bc4701c MD |
1958 | void |
1959 | scm_i_thread_wake_up () | |
1960 | { | |
6087fad9 | 1961 | if (threads_initialized_p) |
9bc4701c | 1962 | { |
9de87eea | 1963 | scm_i_thread *t; |
9de87eea | 1964 | |
0c97d7dd MV |
1965 | scm_i_pthread_cond_broadcast (&wake_up_cond); |
1966 | for (t = all_threads; t; t = t->next_thread) | |
1967 | scm_i_pthread_mutex_unlock (&t->heap_mutex); | |
9de87eea MV |
1968 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
1969 | scm_enter_guile ((scm_t_guile_ticket) SCM_I_CURRENT_THREAD); | |
9bc4701c | 1970 | } |
9bc4701c MD |
1971 | } |
1972 | ||
1973 | void | |
1974 | scm_i_thread_sleep_for_gc () | |
1975 | { | |
9de87eea | 1976 | scm_i_thread *t = suspend (); |
d2a51087 | 1977 | t->held_mutex = &t->heap_mutex; |
9de87eea | 1978 | scm_i_pthread_cond_wait (&wake_up_cond, &t->heap_mutex); |
d2a51087 | 1979 | t->held_mutex = NULL; |
b0dc3d71 | 1980 | resume (t); |
9bc4701c MD |
1981 | } |
1982 | ||
a4d106c7 MV |
1983 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1984 | */ | |
d1138028 | 1985 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1986 | int scm_i_critical_section_level = 0; |
1987 | ||
661ae7ab | 1988 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1989 | |
9bc4701c | 1990 | void |
661ae7ab | 1991 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1992 | { |
a4d106c7 | 1993 | if (scm_is_false (mutex)) |
661ae7ab MV |
1994 | mutex = dynwind_critical_section_mutex; |
1995 | scm_dynwind_lock_mutex (mutex); | |
1996 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1997 | } |
1998 | ||
1999 | /*** Initialization */ | |
2000 | ||
2001 | scm_i_pthread_key_t scm_i_freelist, scm_i_freelist2; | |
2002 | scm_i_pthread_mutex_t scm_i_misc_mutex; | |
2003 | ||
d1138028 MV |
2004 | #if SCM_USE_PTHREAD_THREADS |
2005 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2006 | #endif | |
2007 | ||
9de87eea MV |
2008 | void |
2009 | scm_threads_prehistory (SCM_STACKITEM *base) | |
2010 | { | |
d1138028 MV |
2011 | #if SCM_USE_PTHREAD_THREADS |
2012 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2013 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2014 | PTHREAD_MUTEX_RECURSIVE); | |
2015 | #endif | |
2016 | ||
2017 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2018 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2019 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2020 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
9de87eea MV |
2021 | scm_i_pthread_key_create (&scm_i_freelist, NULL); |
2022 | scm_i_pthread_key_create (&scm_i_freelist2, NULL); | |
74926120 | 2023 | |
9de87eea | 2024 | guilify_self_1 (base); |
9bc4701c MD |
2025 | } |
2026 | ||
d823b11b MV |
2027 | scm_t_bits scm_tc16_thread; |
2028 | scm_t_bits scm_tc16_mutex; | |
2029 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2030 | |
7bfd3b9e | 2031 | void |
9de87eea | 2032 | scm_init_threads () |
7bfd3b9e | 2033 | { |
9de87eea | 2034 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b MV |
2035 | scm_set_smob_mark (scm_tc16_thread, thread_mark); |
2036 | scm_set_smob_print (scm_tc16_thread, thread_print); | |
2037 | scm_set_smob_free (scm_tc16_thread, thread_free); | |
2038 | ||
9de87eea MV |
2039 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
2040 | scm_set_smob_mark (scm_tc16_mutex, fat_mutex_mark); | |
2041 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); | |
2042 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2043 | |
9de87eea MV |
2044 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2045 | sizeof (fat_cond)); | |
2046 | scm_set_smob_mark (scm_tc16_condvar, fat_cond_mark); | |
2047 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); | |
2048 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 2049 | |
9de87eea MV |
2050 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2051 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2052 | threads_initialized_p = 1; |
a4d106c7 | 2053 | |
661ae7ab | 2054 | dynwind_critical_section_mutex = |
a4d106c7 | 2055 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 2056 | } |
89e00824 | 2057 | |
5f05c406 | 2058 | void |
9de87eea | 2059 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2060 | { |
9de87eea MV |
2061 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
2062 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
2063 | } |
2064 | ||
d823b11b | 2065 | void |
9de87eea | 2066 | scm_init_thread_procs () |
d823b11b | 2067 | { |
9de87eea | 2068 | #include "libguile/threads.x" |
d823b11b MV |
2069 | } |
2070 | ||
89e00824 ML |
2071 | /* |
2072 | Local Variables: | |
2073 | c-file-style: "gnu" | |
2074 | End: | |
2075 | */ |