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