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