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 | |
e7bca227 | 24 | #include "libguile/boehm-gc.h" |
1810dc4e RB |
25 | #include "libguile/_scm.h" |
26 | ||
fcc5d734 | 27 | #if HAVE_UNISTD_H |
d823b11b | 28 | #include <unistd.h> |
fcc5d734 | 29 | #endif |
d823b11b MV |
30 | #include <stdio.h> |
31 | #include <assert.h> | |
8ab3d8a0 KR |
32 | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
35 | #endif | |
36 | ||
fcc5d734 | 37 | #if HAVE_SYS_TIME_H |
d823b11b | 38 | #include <sys/time.h> |
fcc5d734 | 39 | #endif |
5f05c406 | 40 | |
d823b11b MV |
41 | #include "libguile/validate.h" |
42 | #include "libguile/root.h" | |
43 | #include "libguile/eval.h" | |
44 | #include "libguile/async.h" | |
45 | #include "libguile/ports.h" | |
46 | #include "libguile/threads.h" | |
a0599745 | 47 | #include "libguile/dynwind.h" |
d823b11b | 48 | #include "libguile/iselect.h" |
9de87eea MV |
49 | #include "libguile/fluids.h" |
50 | #include "libguile/continuations.h" | |
2b829bbb | 51 | #include "libguile/gc.h" |
9de87eea | 52 | #include "libguile/init.h" |
2e77f720 | 53 | #include "libguile/scmsigs.h" |
6180e336 | 54 | #include "libguile/strings.h" |
7bfd3b9e | 55 | |
ecc9f40f MV |
56 | #ifdef __MINGW32__ |
57 | #ifndef ETIMEDOUT | |
58 | # define ETIMEDOUT WSAETIMEDOUT | |
59 | #endif | |
60 | # include <fcntl.h> | |
61 | # include <process.h> | |
62 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
63 | #endif /* __MINGW32__ */ | |
64 | ||
634aa8de LC |
65 | #include <full-read.h> |
66 | ||
67 | \f | |
6180e336 NJ |
68 | static void |
69 | to_timespec (SCM t, scm_t_timespec *waittime) | |
70 | { | |
71 | if (scm_is_pair (t)) | |
72 | { | |
73 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
74 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
75 | } | |
76 | else | |
77 | { | |
78 | double time = scm_to_double (t); | |
79 | double sec = scm_c_truncate (time); | |
80 | ||
81 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 82 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
83 | } |
84 | } | |
85 | ||
d823b11b | 86 | /*** Queues */ |
7bfd3b9e | 87 | |
9de87eea MV |
88 | /* Make an empty queue data structure. |
89 | */ | |
d823b11b MV |
90 | static SCM |
91 | make_queue () | |
92 | { | |
93 | return scm_cons (SCM_EOL, SCM_EOL); | |
94 | } | |
7bfd3b9e | 95 | |
9de87eea MV |
96 | /* Put T at the back of Q and return a handle that can be used with |
97 | remqueue to remove T from Q again. | |
98 | */ | |
d823b11b MV |
99 | static SCM |
100 | enqueue (SCM q, SCM t) | |
101 | { | |
102 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 103 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 104 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
105 | SCM_SETCDR (q, c); |
106 | else | |
107 | SCM_SETCDR (SCM_CAR (q), c); | |
108 | SCM_SETCAR (q, c); | |
d2a51087 | 109 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
110 | return c; |
111 | } | |
7bfd3b9e | 112 | |
9de87eea MV |
113 | /* Remove the element that the handle C refers to from the queue Q. C |
114 | must have been returned from a call to enqueue. The return value | |
115 | is zero when the element referred to by C has already been removed. | |
116 | Otherwise, 1 is returned. | |
117 | */ | |
118 | static int | |
d823b11b MV |
119 | remqueue (SCM q, SCM c) |
120 | { | |
121 | SCM p, prev = q; | |
d2a51087 | 122 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 123 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 124 | { |
bc36d050 | 125 | if (scm_is_eq (p, c)) |
d823b11b | 126 | { |
bc36d050 | 127 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
128 | SCM_SETCAR (q, SCM_CDR (c)); |
129 | SCM_SETCDR (prev, SCM_CDR (c)); | |
d2a51087 | 130 | SCM_CRITICAL_SECTION_END; |
9de87eea | 131 | return 1; |
d823b11b MV |
132 | } |
133 | prev = p; | |
134 | } | |
d2a51087 | 135 | SCM_CRITICAL_SECTION_END; |
9de87eea | 136 | return 0; |
d823b11b MV |
137 | } |
138 | ||
9de87eea MV |
139 | /* Remove the front-most element from the queue Q and return it. |
140 | Return SCM_BOOL_F when Q is empty. | |
141 | */ | |
d823b11b MV |
142 | static SCM |
143 | dequeue (SCM q) | |
144 | { | |
d2a51087 NJ |
145 | SCM c; |
146 | SCM_CRITICAL_SECTION_START; | |
147 | c = SCM_CDR (q); | |
d2e53ed6 | 148 | if (scm_is_null (c)) |
d2a51087 NJ |
149 | { |
150 | SCM_CRITICAL_SECTION_END; | |
151 | return SCM_BOOL_F; | |
152 | } | |
d823b11b MV |
153 | else |
154 | { | |
155 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 156 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 157 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 158 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
159 | return SCM_CAR (c); |
160 | } | |
161 | } | |
7bfd3b9e | 162 | |
9de87eea | 163 | /*** Thread smob routines */ |
76da80e7 | 164 | |
d823b11b MV |
165 | |
166 | static int | |
167 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
168 | { | |
23d72566 KR |
169 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
170 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
171 | the struct case, hence we go via a union, and extract according to the | |
172 | size of pthread_t. */ | |
173 | union { | |
174 | scm_i_pthread_t p; | |
175 | unsigned short us; | |
176 | unsigned int ui; | |
177 | unsigned long ul; | |
178 | scm_t_uintmax um; | |
179 | } u; | |
9de87eea | 180 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
181 | scm_i_pthread_t p = t->pthread; |
182 | scm_t_uintmax id; | |
183 | u.p = p; | |
184 | if (sizeof (p) == sizeof (unsigned short)) | |
185 | id = u.us; | |
186 | else if (sizeof (p) == sizeof (unsigned int)) | |
187 | id = u.ui; | |
188 | else if (sizeof (p) == sizeof (unsigned long)) | |
189 | id = u.ul; | |
190 | else | |
191 | id = u.um; | |
192 | ||
d823b11b | 193 | scm_puts ("#<thread ", port); |
23d72566 | 194 | scm_uintprint (id, 10, port); |
1b92fb6b | 195 | scm_puts (" (", port); |
0345e278 | 196 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 197 | scm_puts (")>", port); |
d823b11b MV |
198 | return 1; |
199 | } | |
200 | ||
201 | static size_t | |
202 | thread_free (SCM obj) | |
203 | { | |
9de87eea MV |
204 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
205 | assert (t->exited); | |
d823b11b MV |
206 | scm_gc_free (t, sizeof (*t), "thread"); |
207 | return 0; | |
208 | } | |
209 | ||
9de87eea | 210 | /*** Blocking on queues. */ |
f7eca35d | 211 | |
9de87eea MV |
212 | /* See also scm_i_queue_async_cell for how such a block is |
213 | interrputed. | |
214 | */ | |
d823b11b | 215 | |
9de87eea MV |
216 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
217 | be woken up by a call to 'unblock_from_queue', or to be | |
218 | interrupted. Upon return of this function, the current thread is | |
219 | no longer on QUEUE, even when the sleep has been interrupted. | |
220 | ||
d2a51087 | 221 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
222 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
223 | ||
224 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
225 | as MUTEX is needed. | |
226 | ||
227 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
228 | ||
229 | The return value of block_self is an errno value. It will be zero | |
230 | when the sleep has been successfully completed by a call to | |
231 | unblock_from_queue, EINTR when it has been interrupted by the | |
232 | delivery of a system async, and ETIMEDOUT when the timeout has | |
233 | expired. | |
234 | ||
235 | The system asyncs themselves are not executed by block_self. | |
236 | */ | |
237 | static int | |
238 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
239 | const scm_t_timespec *waittime) | |
76da80e7 | 240 | { |
9de87eea MV |
241 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
242 | SCM q_handle; | |
243 | int err; | |
244 | ||
245 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
246 | err = EINTR; | |
247 | else | |
248 | { | |
249 | t->block_asyncs++; | |
250 | q_handle = enqueue (queue, t->handle); | |
251 | if (waittime == NULL) | |
252 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
253 | else | |
254 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
255 | ||
256 | /* When we are still on QUEUE, we have been interrupted. We | |
257 | report this only when no other error (such as a timeout) has | |
258 | happened above. | |
259 | */ | |
260 | if (remqueue (queue, q_handle) && err == 0) | |
261 | err = EINTR; | |
262 | t->block_asyncs--; | |
263 | scm_i_reset_sleep (t); | |
264 | } | |
265 | ||
266 | return err; | |
76da80e7 | 267 | } |
9de87eea | 268 | |
d2a51087 NJ |
269 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
270 | returned, or #f if the queue was empty. | |
9de87eea MV |
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 MV |
382 | t->top = NULL; |
383 | } | |
384 | ||
98648121 MV |
385 | typedef void* scm_t_guile_ticket; |
386 | ||
387 | static void | |
9de87eea | 388 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 389 | { |
9de87eea MV |
390 | scm_i_thread *t = (scm_i_thread *)ticket; |
391 | if (t) | |
392 | { | |
9de87eea MV |
393 | resume (t); |
394 | } | |
d823b11b MV |
395 | } |
396 | ||
9de87eea MV |
397 | static scm_i_thread * |
398 | suspend (void) | |
d823b11b | 399 | { |
9de87eea | 400 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
401 | |
402 | /* record top of stack for the GC */ | |
9de87eea | 403 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
404 | /* save registers. */ |
405 | SCM_FLUSH_REGISTER_WINDOWS; | |
9de87eea MV |
406 | setjmp (t->regs); |
407 | return t; | |
d823b11b MV |
408 | } |
409 | ||
98648121 | 410 | static scm_t_guile_ticket |
9de87eea | 411 | scm_leave_guile () |
d823b11b | 412 | { |
9de87eea | 413 | scm_i_thread *t = suspend (); |
9de87eea | 414 | return (scm_t_guile_ticket) t; |
d823b11b MV |
415 | } |
416 | ||
9de87eea MV |
417 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
418 | static scm_i_thread *all_threads = NULL; | |
419 | static int thread_count; | |
420 | ||
421 | static SCM scm_i_default_dynamic_state; | |
422 | ||
423 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 424 | */ |
9de87eea MV |
425 | static void |
426 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 427 | { |
c812243b | 428 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
429 | |
430 | t->pthread = scm_i_pthread_self (); | |
431 | t->handle = SCM_BOOL_F; | |
432 | t->result = SCM_BOOL_F; | |
2e77f720 | 433 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 434 | t->mutexes = SCM_EOL; |
d2a51087 | 435 | t->held_mutex = NULL; |
9de87eea MV |
436 | t->join_queue = SCM_EOL; |
437 | t->dynamic_state = SCM_BOOL_F; | |
438 | t->dynwinds = SCM_EOL; | |
439 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
440 | t->block_asyncs = 1; |
441 | t->pending_asyncs = 1; | |
442 | t->last_debug_frame = NULL; | |
443 | t->base = base; | |
346e4402 NJ |
444 | #ifdef __ia64__ |
445 | /* Calculate and store off the base of this thread's register | |
446 | backing store (RBS). Unfortunately our implementation(s) of | |
447 | scm_ia64_register_backing_store_base are only reliable for the | |
448 | main thread. For other threads, therefore, find out the current | |
449 | top of the RBS, and use that as a maximum. */ | |
450 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
451 | { | |
452 | ucontext_t ctx; | |
453 | void *bsp; | |
454 | getcontext (&ctx); | |
455 | bsp = scm_ia64_ar_bsp (&ctx); | |
456 | if (t->register_backing_store_base > bsp) | |
457 | t->register_backing_store_base = bsp; | |
458 | } | |
459 | #endif | |
0c97d7dd | 460 | t->continuation_root = SCM_EOL; |
9de87eea MV |
461 | t->continuation_base = base; |
462 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
463 | t->sleep_mutex = NULL; | |
464 | t->sleep_object = SCM_BOOL_F; | |
465 | t->sleep_fd = -1; | |
634aa8de LC |
466 | |
467 | if (pipe (t->sleep_pipe) != 0) | |
468 | /* FIXME: Error conditions during the initialization phase are handled | |
469 | gracelessly since public functions such as `scm_init_guile ()' | |
470 | currently have type `void'. */ | |
471 | abort (); | |
472 | ||
86a597f8 | 473 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
378f2625 LC |
474 | t->current_mark_stack_ptr = NULL; |
475 | t->current_mark_stack_limit = NULL; | |
2e77f720 | 476 | t->canceled = 0; |
9de87eea | 477 | t->exited = 0; |
72e6b608 | 478 | t->guile_mode = 0; |
9de87eea | 479 | |
9de87eea MV |
480 | scm_i_pthread_setspecific (scm_i_thread_key, t); |
481 | ||
9de87eea MV |
482 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
483 | t->next_thread = all_threads; | |
484 | all_threads = t; | |
485 | thread_count++; | |
486 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
487 | } |
488 | ||
9de87eea | 489 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 490 | */ |
9de87eea MV |
491 | static void |
492 | guilify_self_2 (SCM parent) | |
d823b11b | 493 | { |
9de87eea MV |
494 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
495 | ||
72e6b608 LC |
496 | t->guile_mode = 1; |
497 | ||
9de87eea | 498 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 499 | |
9de87eea MV |
500 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
501 | t->continuation_base = t->base; | |
502 | ||
503 | if (scm_is_true (parent)) | |
504 | t->dynamic_state = scm_make_dynamic_state (parent); | |
505 | else | |
506 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
507 | ||
508 | t->join_queue = make_queue (); | |
509 | t->block_asyncs = 0; | |
d823b11b MV |
510 | } |
511 | ||
6180e336 NJ |
512 | \f |
513 | /*** Fat mutexes */ | |
514 | ||
515 | /* We implement our own mutex type since we want them to be 'fair', we | |
516 | want to do fancy things while waiting for them (like running | |
517 | asyncs) and we might want to add things that are nice for | |
518 | debugging. | |
519 | */ | |
520 | ||
521 | typedef struct { | |
522 | scm_i_pthread_mutex_t lock; | |
523 | SCM owner; | |
adc085f1 | 524 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 525 | |
adc085f1 | 526 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
527 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
528 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
529 | owned by the current thread? */ | |
530 | ||
531 | SCM waiting; /* the threads waiting for this mutex. */ | |
532 | } fat_mutex; | |
533 | ||
534 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
535 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
536 | ||
9de87eea | 537 | /* Perform thread tear-down, in guile mode. |
d823b11b | 538 | */ |
9de87eea MV |
539 | static void * |
540 | do_thread_exit (void *v) | |
541 | { | |
2e77f720 LC |
542 | scm_i_thread *t = (scm_i_thread *) v; |
543 | ||
544 | if (!scm_is_false (t->cleanup_handler)) | |
545 | { | |
546 | SCM ptr = t->cleanup_handler; | |
547 | ||
548 | t->cleanup_handler = SCM_BOOL_F; | |
549 | t->result = scm_internal_catch (SCM_BOOL_T, | |
550 | (scm_t_catch_body) scm_call_0, ptr, | |
551 | scm_handle_by_message_noexit, NULL); | |
552 | } | |
9de87eea | 553 | |
86a597f8 | 554 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
555 | |
556 | t->exited = 1; | |
0c97d7dd MV |
557 | close (t->sleep_pipe[0]); |
558 | close (t->sleep_pipe[1]); | |
9de87eea MV |
559 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
560 | ; | |
9de87eea | 561 | |
74926120 | 562 | while (!scm_is_null (t->mutexes)) |
6180e336 NJ |
563 | { |
564 | SCM mutex = SCM_CAR (t->mutexes); | |
565 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
566 | scm_i_pthread_mutex_lock (&m->lock); | |
74926120 | 567 | |
6180e336 NJ |
568 | unblock_from_queue (m->waiting); |
569 | ||
74926120 | 570 | scm_i_pthread_mutex_unlock (&m->lock); |
6180e336 NJ |
571 | t->mutexes = SCM_CDR (t->mutexes); |
572 | } | |
573 | ||
86a597f8 | 574 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 575 | |
9de87eea MV |
576 | return NULL; |
577 | } | |
578 | ||
d823b11b | 579 | static void |
9de87eea | 580 | on_thread_exit (void *v) |
d823b11b | 581 | { |
29776e85 | 582 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 583 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 584 | |
d2a51087 NJ |
585 | /* If this thread was cancelled while doing a cond wait, it will |
586 | still have a mutex locked, so we unlock it here. */ | |
587 | if (t->held_mutex) | |
588 | { | |
589 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
590 | t->held_mutex = NULL; | |
591 | } | |
592 | ||
9de87eea | 593 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 594 | |
2e77f720 LC |
595 | /* Ensure the signal handling thread has been launched, because we might be |
596 | shutting it down. */ | |
597 | scm_i_ensure_signal_delivery_thread (); | |
598 | ||
0c97d7dd | 599 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 600 | since the queue is a SCM data structure. */ |
35747a3e | 601 | |
47b6e9bd LC |
602 | /* Note: Since `do_thread_exit ()' uses allocates memory via `libgc', we |
603 | assume the GC is usable at this point, and notably that thread-local | |
604 | storage (TLS) hasn't been deallocated yet. */ | |
605 | do_thread_exit (v); | |
0c97d7dd MV |
606 | |
607 | /* Removing ourself from the list of all threads needs to happen in | |
608 | non-guile mode since all SCM values on our stack become | |
29776e85 | 609 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
610 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
611 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
612 | if (*tp == t) | |
613 | { | |
614 | *tp = t->next_thread; | |
615 | break; | |
616 | } | |
617 | thread_count--; | |
2e77f720 LC |
618 | |
619 | /* If there's only one other thread, it could be the signal delivery | |
620 | thread, so we need to notify it to shut down by closing its read pipe. | |
621 | If it's not the signal delivery thread, then closing the read pipe isn't | |
622 | going to hurt. */ | |
623 | if (thread_count <= 1) | |
624 | scm_i_close_signal_pipe (); | |
625 | ||
0c97d7dd MV |
626 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
627 | ||
9de87eea | 628 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
629 | } |
630 | ||
9de87eea | 631 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 632 | |
9de87eea MV |
633 | static void |
634 | init_thread_key (void) | |
635 | { | |
47b6e9bd | 636 | scm_i_pthread_key_create (&scm_i_thread_key, NULL); |
9de87eea | 637 | } |
d823b11b | 638 | |
9de87eea MV |
639 | /* Perform any initializations necessary to bring the current thread |
640 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 641 | |
9de87eea MV |
642 | BASE is the stack base to use with GC. |
643 | ||
644 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
645 | which case the default dynamic state is used. | |
646 | ||
647 | Return zero when the thread was in guile mode already; otherwise | |
648 | return 1. | |
649 | */ | |
650 | ||
651 | static int | |
652 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 653 | { |
9de87eea MV |
654 | scm_i_thread *t; |
655 | ||
656 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
657 | ||
658 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
659 | { | |
660 | /* This thread has not been guilified yet. | |
661 | */ | |
662 | ||
663 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
664 | if (scm_initialized_p == 0) | |
665 | { | |
666 | /* First thread ever to enter Guile. Run the full | |
667 | initialization. | |
668 | */ | |
669 | scm_i_init_guile (base); | |
670 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
671 | } | |
672 | else | |
673 | { | |
674 | /* Guile is already initialized, but this thread enters it for | |
675 | the first time. Only initialize this thread. | |
676 | */ | |
677 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
678 | guilify_self_1 (base); | |
679 | guilify_self_2 (parent); | |
680 | } | |
681 | return 1; | |
682 | } | |
683 | else if (t->top) | |
684 | { | |
685 | /* This thread is already guilified but not in guile mode, just | |
686 | resume it. | |
74926120 | 687 | |
ccf1ca4a LC |
688 | A user call to scm_with_guile() will lead us to here. This could |
689 | happen from anywhere on the stack, and in particular lower on the | |
690 | stack than when it was when this thread was first guilified. Thus, | |
691 | `base' must be updated. */ | |
692 | #if SCM_STACK_GROWS_UP | |
693 | if (base < t->base) | |
694 | t->base = base; | |
695 | #else | |
696 | if (base > t->base) | |
697 | t->base = base; | |
698 | #endif | |
699 | ||
9de87eea MV |
700 | scm_enter_guile ((scm_t_guile_ticket) t); |
701 | return 1; | |
702 | } | |
703 | else | |
704 | { | |
705 | /* Thread is already in guile mode. Nothing to do. | |
706 | */ | |
707 | return 0; | |
708 | } | |
d823b11b MV |
709 | } |
710 | ||
9de87eea | 711 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 712 | |
23d72566 KR |
713 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
714 | /* This method for GNU/Linux and perhaps some other systems. | |
715 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
716 | available on them. */ | |
9de87eea MV |
717 | #define HAVE_GET_THREAD_STACK_BASE |
718 | ||
719 | static SCM_STACKITEM * | |
720 | get_thread_stack_base () | |
d823b11b | 721 | { |
9de87eea MV |
722 | pthread_attr_t attr; |
723 | void *start, *end; | |
724 | size_t size; | |
725 | ||
9de87eea MV |
726 | pthread_getattr_np (pthread_self (), &attr); |
727 | pthread_attr_getstack (&attr, &start, &size); | |
728 | end = (char *)start + size; | |
729 | ||
2b829bbb KR |
730 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
731 | for the main thread, but we can use scm_get_stack_base in that | |
732 | case. | |
733 | */ | |
734 | ||
735 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 736 | if ((void *)&attr < start || (void *)&attr >= end) |
071e0d93 | 737 | return (SCM_STACKITEM *) GC_stackbottom; |
9de87eea | 738 | else |
2b829bbb | 739 | #endif |
9de87eea MV |
740 | { |
741 | #if SCM_STACK_GROWS_UP | |
742 | return start; | |
743 | #else | |
744 | return end; | |
745 | #endif | |
746 | } | |
a54a94b3 MV |
747 | } |
748 | ||
23d72566 KR |
749 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
750 | /* This method for MacOS X. | |
751 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
752 | but as of 2006 there's nothing obvious at apple.com. */ | |
753 | #define HAVE_GET_THREAD_STACK_BASE | |
754 | static SCM_STACKITEM * | |
755 | get_thread_stack_base () | |
756 | { | |
757 | return pthread_get_stackaddr_np (pthread_self ()); | |
758 | } | |
759 | ||
760 | #elif defined (__MINGW32__) | |
761 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
762 | in any thread. We don't like hard-coding the name of a system, but there | |
763 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
764 | work. */ | |
765 | #define HAVE_GET_THREAD_STACK_BASE | |
766 | static SCM_STACKITEM * | |
767 | get_thread_stack_base () | |
768 | { | |
071e0d93 | 769 | return (SCM_STACKITEM *) GC_stackbottom; |
23d72566 KR |
770 | } |
771 | ||
772 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
773 | |
774 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
775 | ||
776 | #define HAVE_GET_THREAD_STACK_BASE | |
777 | ||
778 | static SCM_STACKITEM * | |
779 | get_thread_stack_base () | |
a54a94b3 | 780 | { |
071e0d93 | 781 | return (SCM_STACKITEM *) GC_stackbottom; |
d823b11b MV |
782 | } |
783 | ||
9de87eea | 784 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
785 | |
786 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
787 | ||
788 | void | |
789 | scm_init_guile () | |
d823b11b | 790 | { |
9de87eea MV |
791 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
792 | scm_i_default_dynamic_state); | |
d823b11b MV |
793 | } |
794 | ||
9de87eea MV |
795 | #endif |
796 | ||
797 | void * | |
798 | scm_with_guile (void *(*func)(void *), void *data) | |
799 | { | |
800 | return scm_i_with_guile_and_parent (func, data, | |
801 | scm_i_default_dynamic_state); | |
802 | } | |
803 | ||
70eca635 | 804 | SCM_UNUSED static void |
2e77f720 LC |
805 | scm_leave_guile_cleanup (void *x) |
806 | { | |
807 | scm_leave_guile (); | |
47b6e9bd | 808 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
809 | } |
810 | ||
9de87eea | 811 | void * |
2e77f720 | 812 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
813 | { |
814 | void *res; | |
815 | int really_entered; | |
816 | SCM_STACKITEM base_item; | |
2e77f720 | 817 | |
9de87eea | 818 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 819 | if (really_entered) |
2e77f720 LC |
820 | { |
821 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
822 | res = scm_c_with_continuation_barrier (func, data); | |
823 | scm_i_pthread_cleanup_pop (0); | |
824 | scm_leave_guile (); | |
825 | } | |
74926120 | 826 | else |
2e77f720 LC |
827 | res = scm_c_with_continuation_barrier (func, data); |
828 | ||
9de87eea MV |
829 | return res; |
830 | } | |
831 | ||
72e6b608 LC |
832 | \f |
833 | /*** Non-guile mode. */ | |
834 | ||
835 | #if (defined HAVE_GC_DO_BLOCKING) && (!defined HAVE_DECL_GC_DO_BLOCKING) | |
836 | ||
837 | /* This declaration is missing from the public headers of GC 7.1. */ | |
838 | extern void GC_do_blocking (void (*) (void *), void *); | |
839 | ||
840 | #endif | |
841 | ||
842 | #ifdef HAVE_GC_DO_BLOCKING | |
843 | struct without_guile_arg | |
844 | { | |
845 | void * (*function) (void *); | |
846 | void *data; | |
847 | void *result; | |
848 | }; | |
849 | ||
850 | static void | |
851 | without_guile_trampoline (void *closure) | |
852 | { | |
853 | struct without_guile_arg *arg; | |
854 | ||
855 | SCM_I_CURRENT_THREAD->guile_mode = 0; | |
856 | ||
857 | arg = (struct without_guile_arg *) closure; | |
858 | arg->result = arg->function (arg->data); | |
859 | ||
860 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
861 | } | |
862 | #endif | |
863 | ||
9de87eea MV |
864 | void * |
865 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 866 | { |
72e6b608 LC |
867 | void *result; |
868 | ||
869 | #ifdef HAVE_GC_DO_BLOCKING | |
870 | if (SCM_I_CURRENT_THREAD->guile_mode) | |
871 | { | |
872 | struct without_guile_arg arg; | |
873 | ||
874 | arg.function = func; | |
875 | arg.data = data; | |
876 | GC_do_blocking (without_guile_trampoline, &arg); | |
877 | result = arg.result; | |
878 | } | |
879 | else | |
880 | #endif | |
881 | result = func (data); | |
882 | ||
883 | return result; | |
9de87eea MV |
884 | } |
885 | ||
72e6b608 | 886 | \f |
9de87eea MV |
887 | /*** Thread creation */ |
888 | ||
889 | typedef struct { | |
890 | SCM parent; | |
891 | SCM thunk; | |
892 | SCM handler; | |
76da80e7 | 893 | SCM thread; |
9de87eea MV |
894 | scm_i_pthread_mutex_t mutex; |
895 | scm_i_pthread_cond_t cond; | |
896 | } launch_data; | |
d823b11b | 897 | |
9de87eea MV |
898 | static void * |
899 | really_launch (void *d) | |
900 | { | |
901 | launch_data *data = (launch_data *)d; | |
902 | SCM thunk = data->thunk, handler = data->handler; | |
903 | scm_i_thread *t; | |
d823b11b | 904 | |
9de87eea | 905 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 906 | |
9de87eea MV |
907 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
908 | data->thread = scm_current_thread (); | |
909 | scm_i_pthread_cond_signal (&data->cond); | |
910 | scm_i_pthread_mutex_unlock (&data->mutex); | |
911 | ||
912 | if (SCM_UNBNDP (handler)) | |
913 | t->result = scm_call_0 (thunk); | |
914 | else | |
915 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
916 | ||
47b6e9bd LC |
917 | /* Trigger a call to `on_thread_exit ()'. */ |
918 | pthread_exit (NULL); | |
919 | ||
9de87eea | 920 | return 0; |
d823b11b MV |
921 | } |
922 | ||
9de87eea MV |
923 | static void * |
924 | launch_thread (void *d) | |
925 | { | |
926 | launch_data *data = (launch_data *)d; | |
927 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
928 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
929 | return NULL; | |
930 | } | |
931 | ||
932 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 933 | (SCM thunk, SCM handler), |
9de87eea MV |
934 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
935 | "returning a new thread object representing the thread. The procedure\n" | |
936 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
937 | "\n" | |
938 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
939 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
940 | "handler. This catch is established inside the continuation barrier.\n" | |
941 | "\n" | |
942 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
943 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
944 | #define FUNC_NAME s_scm_call_with_new_thread |
945 | { | |
9de87eea MV |
946 | launch_data data; |
947 | scm_i_pthread_t id; | |
948 | int err; | |
d823b11b | 949 | |
9de87eea MV |
950 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
951 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
952 | handler, SCM_ARG2, FUNC_NAME); | |
953 | ||
954 | data.parent = scm_current_dynamic_state (); | |
955 | data.thunk = thunk; | |
956 | data.handler = handler; | |
957 | data.thread = SCM_BOOL_F; | |
958 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
959 | scm_i_pthread_cond_init (&data.cond, NULL); | |
960 | ||
961 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
962 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
963 | if (err) | |
964 | { | |
965 | scm_i_pthread_mutex_unlock (&data.mutex); | |
966 | errno = err; | |
967 | scm_syserror (NULL); | |
968 | } | |
969 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
970 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 971 | |
9de87eea | 972 | return data.thread; |
d823b11b MV |
973 | } |
974 | #undef FUNC_NAME | |
975 | ||
9de87eea MV |
976 | typedef struct { |
977 | SCM parent; | |
978 | scm_t_catch_body body; | |
979 | void *body_data; | |
980 | scm_t_catch_handler handler; | |
981 | void *handler_data; | |
982 | SCM thread; | |
983 | scm_i_pthread_mutex_t mutex; | |
984 | scm_i_pthread_cond_t cond; | |
985 | } spawn_data; | |
986 | ||
987 | static void * | |
988 | really_spawn (void *d) | |
989 | { | |
990 | spawn_data *data = (spawn_data *)d; | |
991 | scm_t_catch_body body = data->body; | |
992 | void *body_data = data->body_data; | |
993 | scm_t_catch_handler handler = data->handler; | |
994 | void *handler_data = data->handler_data; | |
995 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
996 | ||
997 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
998 | data->thread = scm_current_thread (); | |
999 | scm_i_pthread_cond_signal (&data->cond); | |
1000 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1001 | ||
1002 | if (handler == NULL) | |
1003 | t->result = body (body_data); | |
1004 | else | |
1005 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1006 | body, body_data, | |
1007 | handler, handler_data); | |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static void * | |
1013 | spawn_thread (void *d) | |
1014 | { | |
1015 | spawn_data *data = (spawn_data *)d; | |
1016 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1017 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1018 | return NULL; | |
1019 | } | |
1020 | ||
1021 | SCM | |
1022 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1023 | scm_t_catch_handler handler, void *handler_data) | |
1024 | { | |
1025 | spawn_data data; | |
1026 | scm_i_pthread_t id; | |
1027 | int err; | |
1028 | ||
1029 | data.parent = scm_current_dynamic_state (); | |
1030 | data.body = body; | |
1031 | data.body_data = body_data; | |
1032 | data.handler = handler; | |
1033 | data.handler_data = handler_data; | |
1034 | data.thread = SCM_BOOL_F; | |
1035 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1036 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1037 | ||
1038 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1039 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1040 | if (err) | |
1041 | { | |
1042 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1043 | errno = err; | |
1044 | scm_syserror (NULL); | |
1045 | } | |
1046 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1047 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1048 | |
9de87eea MV |
1049 | return data.thread; |
1050 | } | |
1051 | ||
29717c89 MD |
1052 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1053 | (), | |
1054 | "Move the calling thread to the end of the scheduling queue.") | |
1055 | #define FUNC_NAME s_scm_yield | |
1056 | { | |
9de87eea | 1057 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1058 | } |
1059 | #undef FUNC_NAME | |
1060 | ||
2e77f720 LC |
1061 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1062 | (SCM thread), | |
1063 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1064 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1065 | "been signaled to terminate, this function is a no-op.") | |
1066 | #define FUNC_NAME s_scm_cancel_thread | |
1067 | { | |
1068 | scm_i_thread *t = NULL; | |
1069 | ||
1070 | SCM_VALIDATE_THREAD (1, thread); | |
1071 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1072 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1073 | if (!t->canceled) |
1074 | { | |
1075 | t->canceled = 1; | |
86a597f8 | 1076 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1077 | scm_i_pthread_cancel (t->pthread); |
1078 | } | |
1079 | else | |
86a597f8 | 1080 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1081 | |
1082 | return SCM_UNSPECIFIED; | |
1083 | } | |
1084 | #undef FUNC_NAME | |
1085 | ||
1086 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1087 | (SCM thread, SCM proc), | |
1088 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1089 | "This handler will be called when the thread exits.") | |
1090 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1091 | { | |
1092 | scm_i_thread *t; | |
1093 | ||
1094 | SCM_VALIDATE_THREAD (1, thread); | |
1095 | if (!scm_is_false (proc)) | |
1096 | SCM_VALIDATE_THUNK (2, proc); | |
1097 | ||
2e77f720 | 1098 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1099 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1100 | ||
2e77f720 LC |
1101 | if (!(t->exited || t->canceled)) |
1102 | t->cleanup_handler = proc; | |
1103 | ||
86a597f8 | 1104 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1105 | |
1106 | return SCM_UNSPECIFIED; | |
1107 | } | |
1108 | #undef FUNC_NAME | |
1109 | ||
1110 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1111 | (SCM thread), | |
1112 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1113 | #define FUNC_NAME s_scm_thread_cleanup | |
1114 | { | |
1115 | scm_i_thread *t; | |
1116 | SCM ret; | |
1117 | ||
1118 | SCM_VALIDATE_THREAD (1, thread); | |
1119 | ||
2e77f720 | 1120 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1121 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1122 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1123 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1124 | |
1125 | return ret; | |
1126 | } | |
1127 | #undef FUNC_NAME | |
1128 | ||
6180e336 NJ |
1129 | SCM scm_join_thread (SCM thread) |
1130 | { | |
1131 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1132 | } | |
1133 | ||
1134 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1135 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1136 | "Suspend execution of the calling thread until the target @var{thread} " |
1137 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1138 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1139 | { |
9de87eea | 1140 | scm_i_thread *t; |
6180e336 NJ |
1141 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1142 | SCM res = SCM_BOOL_F; | |
1143 | ||
1144 | if (! (SCM_UNBNDP (timeoutval))) | |
1145 | res = timeoutval; | |
d823b11b MV |
1146 | |
1147 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1148 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1149 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1150 | |
9de87eea | 1151 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1152 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1153 | ||
6180e336 NJ |
1154 | if (! SCM_UNBNDP (timeout)) |
1155 | { | |
1156 | to_timespec (timeout, &ctimeout); | |
1157 | timeout_ptr = &ctimeout; | |
1158 | } | |
1159 | ||
1160 | if (t->exited) | |
1161 | res = t->result; | |
1162 | else | |
d823b11b | 1163 | { |
9de87eea MV |
1164 | while (1) |
1165 | { | |
74926120 | 1166 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1167 | timeout_ptr); |
1168 | if (err == 0) | |
1169 | { | |
1170 | if (t->exited) | |
1171 | { | |
1172 | res = t->result; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | else if (err == ETIMEDOUT) | |
9de87eea | 1177 | break; |
6180e336 | 1178 | |
86a597f8 | 1179 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1180 | SCM_TICK; |
86a597f8 | 1181 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea | 1182 | } |
d823b11b | 1183 | } |
9de87eea | 1184 | |
86a597f8 | 1185 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1186 | |
d823b11b | 1187 | return res; |
5f05c406 MV |
1188 | } |
1189 | #undef FUNC_NAME | |
1190 | ||
6180e336 NJ |
1191 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1192 | (SCM obj), | |
1193 | "Return @code{#t} if @var{obj} is a thread.") | |
1194 | #define FUNC_NAME s_scm_thread_p | |
1195 | { | |
1196 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1197 | } | |
1198 | #undef FUNC_NAME | |
5f05c406 | 1199 | |
4079f87e | 1200 | |
9de87eea MV |
1201 | static size_t |
1202 | fat_mutex_free (SCM mx) | |
76da80e7 | 1203 | { |
9de87eea MV |
1204 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1205 | scm_i_pthread_mutex_destroy (&m->lock); | |
1206 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1207 | return 0; |
1208 | } | |
1209 | ||
1210 | static int | |
9de87eea | 1211 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1212 | { |
9de87eea MV |
1213 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1214 | scm_puts ("#<mutex ", port); | |
1215 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1216 | scm_puts (">", port); | |
1217 | return 1; | |
76da80e7 MV |
1218 | } |
1219 | ||
76da80e7 | 1220 | static SCM |
6180e336 | 1221 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1222 | { |
9de87eea MV |
1223 | fat_mutex *m; |
1224 | SCM mx; | |
1225 | ||
1226 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1227 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1228 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1229 | m->level = 0; |
6180e336 | 1230 | |
adc085f1 | 1231 | m->recursive = recursive; |
6180e336 NJ |
1232 | m->unchecked_unlock = unchecked_unlock; |
1233 | m->allow_external_unlock = external_unlock; | |
1234 | ||
9de87eea MV |
1235 | m->waiting = SCM_EOL; |
1236 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1237 | m->waiting = make_queue (); | |
1238 | return mx; | |
76da80e7 MV |
1239 | } |
1240 | ||
6180e336 NJ |
1241 | SCM scm_make_mutex (void) |
1242 | { | |
1243 | return scm_make_mutex_with_flags (SCM_EOL); | |
1244 | } | |
1245 | ||
2a1d0688 NJ |
1246 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1247 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1248 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1249 | |
1250 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1251 | (SCM flags), | |
9de87eea | 1252 | "Create a new mutex. ") |
6180e336 | 1253 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1254 | { |
6180e336 NJ |
1255 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1256 | ||
1257 | SCM ptr = flags; | |
1258 | while (! scm_is_null (ptr)) | |
1259 | { | |
1260 | SCM flag = SCM_CAR (ptr); | |
1261 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1262 | unchecked_unlock = 1; | |
1263 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1264 | external_unlock = 1; | |
1265 | else if (scm_is_eq (flag, recursive_sym)) | |
1266 | recursive = 1; | |
74926120 | 1267 | else |
2a1d0688 | 1268 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1269 | ptr = SCM_CDR (ptr); |
1270 | } | |
1271 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1272 | } |
1273 | #undef FUNC_NAME | |
1274 | ||
9de87eea | 1275 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1276 | (void), |
9de87eea MV |
1277 | "Create a new recursive mutex. ") |
1278 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1279 | { |
6180e336 | 1280 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1281 | } |
1282 | #undef FUNC_NAME | |
1283 | ||
6180e336 NJ |
1284 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1285 | ||
1286 | static SCM | |
adc085f1 | 1287 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1288 | { |
1289 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1290 | |
adc085f1 | 1291 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1292 | SCM err = SCM_BOOL_F; |
1293 | ||
1294 | struct timeval current_time; | |
9de87eea MV |
1295 | |
1296 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1297 | |
1298 | while (1) | |
9de87eea | 1299 | { |
adc085f1 | 1300 | if (m->level == 0) |
6180e336 | 1301 | { |
adc085f1 | 1302 | m->owner = new_owner; |
6180e336 | 1303 | m->level++; |
74926120 | 1304 | |
adc085f1 | 1305 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1306 | { |
adc085f1 | 1307 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 NJ |
1308 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1309 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1310 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
6180e336 | 1311 | } |
adc085f1 JG |
1312 | *ret = 1; |
1313 | break; | |
1314 | } | |
1315 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1316 | { | |
1317 | m->owner = new_owner; | |
1318 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1319 | scm_from_locale_string ("lock obtained on abandoned " | |
1320 | "mutex")); | |
1321 | *ret = 1; | |
1322 | break; | |
1323 | } | |
1324 | else if (scm_is_eq (m->owner, new_owner)) | |
1325 | { | |
1326 | if (m->recursive) | |
1327 | { | |
1328 | m->level++; | |
74926120 | 1329 | *ret = 1; |
adc085f1 JG |
1330 | } |
1331 | else | |
6180e336 | 1332 | { |
adc085f1 JG |
1333 | err = scm_cons (scm_misc_error_key, |
1334 | scm_from_locale_string ("mutex already locked " | |
1335 | "by thread")); | |
1336 | *ret = 0; | |
1337 | } | |
74926120 | 1338 | break; |
adc085f1 | 1339 | } |
9de87eea | 1340 | else |
9de87eea | 1341 | { |
74926120 | 1342 | if (timeout != NULL) |
adc085f1 JG |
1343 | { |
1344 | gettimeofday (¤t_time, NULL); | |
1345 | if (current_time.tv_sec > timeout->tv_sec || | |
1346 | (current_time.tv_sec == timeout->tv_sec && | |
1347 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1348 | { |
adc085f1 JG |
1349 | *ret = 0; |
1350 | break; | |
6180e336 | 1351 | } |
6180e336 | 1352 | } |
37a52039 | 1353 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1354 | scm_i_pthread_mutex_unlock (&m->lock); |
1355 | SCM_TICK; | |
1356 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1357 | } | |
1358 | } | |
1359 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1360 | return err; |
9de87eea MV |
1361 | } |
1362 | ||
6180e336 NJ |
1363 | SCM scm_lock_mutex (SCM mx) |
1364 | { | |
adc085f1 | 1365 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1366 | } |
1367 | ||
adc085f1 JG |
1368 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1369 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1370 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1371 | "blocks until the mutex becomes available. The function returns when " | |
1372 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1373 | "a thread already owns will succeed right away and will not block the " | |
1374 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1375 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1376 | { |
6180e336 NJ |
1377 | SCM exception; |
1378 | int ret = 0; | |
1379 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1380 | |
6180e336 NJ |
1381 | SCM_VALIDATE_MUTEX (1, m); |
1382 | ||
1383 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1384 | { | |
1385 | to_timespec (timeout, &cwaittime); | |
1386 | waittime = &cwaittime; | |
1387 | } | |
1388 | ||
adc085f1 | 1389 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1390 | if (!scm_is_false (exception)) |
1391 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1392 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1393 | } |
76da80e7 | 1394 | #undef FUNC_NAME |
9bc4701c | 1395 | |
a4d106c7 | 1396 | void |
661ae7ab | 1397 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1398 | { |
661ae7ab MV |
1399 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1400 | SCM_F_WIND_EXPLICITLY); | |
1401 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1402 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1403 | } |
1404 | ||
9bc4701c | 1405 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1406 | (SCM mutex), |
9bc4701c MD |
1407 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1408 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1409 | #define FUNC_NAME s_scm_try_mutex | |
1410 | { | |
6180e336 NJ |
1411 | SCM exception; |
1412 | int ret = 0; | |
1413 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1414 | |
ba1b7223 | 1415 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1416 | |
1417 | to_timespec (scm_from_int(0), &cwaittime); | |
1418 | waittime = &cwaittime; | |
74926120 | 1419 | |
adc085f1 | 1420 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1421 | if (!scm_is_false (exception)) |
1422 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1423 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1424 | } |
1425 | #undef FUNC_NAME | |
76da80e7 | 1426 | |
6180e336 NJ |
1427 | /*** Fat condition variables */ |
1428 | ||
1429 | typedef struct { | |
1430 | scm_i_pthread_mutex_t lock; | |
1431 | SCM waiting; /* the threads waiting for this condition. */ | |
1432 | } fat_cond; | |
1433 | ||
1434 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1435 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1436 | ||
1437 | static int | |
1438 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1439 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1440 | { |
6180e336 NJ |
1441 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1442 | fat_cond *c = NULL; | |
1443 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1444 | int err = 0, ret = 0; | |
9de87eea MV |
1445 | |
1446 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1447 | |
1448 | SCM owner = m->owner; | |
1449 | ||
1450 | if (!scm_is_eq (owner, scm_current_thread ())) | |
9bc4701c | 1451 | { |
adc085f1 | 1452 | if (m->level == 0) |
6180e336 NJ |
1453 | { |
1454 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1455 | { |
1456 | scm_i_pthread_mutex_unlock (&m->lock); | |
1457 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1458 | } | |
adc085f1 | 1459 | owner = scm_current_thread (); |
6180e336 NJ |
1460 | } |
1461 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1462 | { |
1463 | scm_i_pthread_mutex_unlock (&m->lock); | |
1464 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1465 | } | |
6180e336 NJ |
1466 | } |
1467 | ||
1468 | if (! (SCM_UNBNDP (cond))) | |
1469 | { | |
6180e336 NJ |
1470 | c = SCM_CONDVAR_DATA (cond); |
1471 | while (1) | |
1472 | { | |
1473 | int brk = 0; | |
1474 | ||
6180e336 NJ |
1475 | if (m->level > 0) |
1476 | m->level--; | |
adc085f1 | 1477 | if (m->level == 0) |
6180e336 | 1478 | m->owner = unblock_from_queue (m->waiting); |
adc085f1 | 1479 | |
6180e336 | 1480 | t->block_asyncs++; |
74926120 | 1481 | |
d2a51087 NJ |
1482 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1483 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1484 | |
1485 | if (err == 0) | |
1486 | { | |
1487 | ret = 1; | |
1488 | brk = 1; | |
1489 | } | |
1490 | else if (err == ETIMEDOUT) | |
1491 | { | |
1492 | ret = 0; | |
1493 | brk = 1; | |
1494 | } | |
1495 | else if (err != EINTR) | |
74926120 | 1496 | { |
6180e336 | 1497 | errno = err; |
6180e336 | 1498 | scm_syserror (NULL); |
74926120 | 1499 | } |
6180e336 NJ |
1500 | |
1501 | if (brk) | |
1502 | { | |
1503 | if (relock) | |
adc085f1 | 1504 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
6180e336 NJ |
1505 | break; |
1506 | } | |
74926120 | 1507 | |
6180e336 NJ |
1508 | t->block_asyncs--; |
1509 | scm_async_click (); | |
74926120 | 1510 | |
6180e336 NJ |
1511 | scm_remember_upto_here_2 (cond, mutex); |
1512 | ||
1513 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1514 | } | |
9bc4701c | 1515 | } |
9de87eea | 1516 | else |
6180e336 NJ |
1517 | { |
1518 | if (m->level > 0) | |
1519 | m->level--; | |
74926120 | 1520 | if (m->level == 0) |
6180e336 | 1521 | m->owner = unblock_from_queue (m->waiting); |
74926120 | 1522 | |
6180e336 NJ |
1523 | scm_i_pthread_mutex_unlock (&m->lock); |
1524 | ret = 1; | |
1525 | } | |
9de87eea | 1526 | |
6180e336 | 1527 | return ret; |
9bc4701c | 1528 | } |
9bc4701c | 1529 | |
6180e336 NJ |
1530 | SCM scm_unlock_mutex (SCM mx) |
1531 | { | |
1532 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1533 | } |
9bc4701c | 1534 | |
6180e336 NJ |
1535 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1536 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1537 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1538 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1539 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1540 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1541 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1542 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1543 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1544 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1545 | { |
6180e336 NJ |
1546 | scm_t_timespec cwaittime, *waittime = NULL; |
1547 | ||
9bc4701c | 1548 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1549 | if (! (SCM_UNBNDP (cond))) |
1550 | { | |
1551 | SCM_VALIDATE_CONDVAR (2, cond); | |
1552 | ||
1553 | if (! (SCM_UNBNDP (timeout))) | |
1554 | { | |
1555 | to_timespec (timeout, &cwaittime); | |
1556 | waittime = &cwaittime; | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1561 | } |
1562 | #undef FUNC_NAME | |
1563 | ||
6180e336 NJ |
1564 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1565 | (SCM obj), | |
1566 | "Return @code{#t} if @var{obj} is a mutex.") | |
1567 | #define FUNC_NAME s_scm_mutex_p | |
1568 | { | |
1569 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1570 | } | |
74926120 | 1571 | #undef FUNC_NAME |
9de87eea MV |
1572 | |
1573 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1574 | (SCM mx), | |
1575 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1576 | #define FUNC_NAME s_scm_mutex_owner | |
1577 | { | |
adc085f1 JG |
1578 | SCM owner; |
1579 | fat_mutex *m = NULL; | |
1580 | ||
9de87eea | 1581 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1582 | m = SCM_MUTEX_DATA (mx); |
1583 | scm_i_pthread_mutex_lock (&m->lock); | |
1584 | owner = m->owner; | |
1585 | scm_i_pthread_mutex_unlock (&m->lock); | |
1586 | ||
1587 | return owner; | |
9de87eea MV |
1588 | } |
1589 | #undef FUNC_NAME | |
1590 | ||
1591 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1592 | (SCM mx), | |
adc085f1 | 1593 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1594 | #define FUNC_NAME s_scm_mutex_level |
1595 | { | |
1596 | SCM_VALIDATE_MUTEX (1, mx); | |
1597 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1598 | } | |
1599 | #undef FUNC_NAME | |
1600 | ||
adc085f1 JG |
1601 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1602 | (SCM mx), | |
1603 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1604 | #define FUNC_NAME s_scm_mutex_locked_p | |
1605 | { | |
1606 | SCM_VALIDATE_MUTEX (1, mx); | |
1607 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1608 | } | |
1609 | #undef FUNC_NAME | |
9de87eea | 1610 | |
9de87eea MV |
1611 | static size_t |
1612 | fat_cond_free (SCM mx) | |
1613 | { | |
1614 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
9de87eea MV |
1615 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static int | |
1620 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1621 | { | |
1622 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1623 | scm_puts ("#<condition-variable ", port); | |
1624 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1625 | scm_puts (">", port); | |
1626 | return 1; | |
1627 | } | |
9bc4701c | 1628 | |
d823b11b MV |
1629 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1630 | (void), | |
1631 | "Make a new condition variable.") | |
1632 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1633 | { |
9de87eea MV |
1634 | fat_cond *c; |
1635 | SCM cv; | |
1636 | ||
1637 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1638 | c->waiting = SCM_EOL; |
1639 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1640 | c->waiting = make_queue (); | |
d823b11b | 1641 | return cv; |
5f05c406 | 1642 | } |
d823b11b | 1643 | #undef FUNC_NAME |
5f05c406 | 1644 | |
d823b11b MV |
1645 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1646 | (SCM cv, SCM mx, SCM t), | |
1647 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1648 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1649 | "is locked again when this function returns. When @var{time} is given, " | |
1650 | "it specifies a point in time where the waiting should be aborted. It " | |
1651 | "can be either a integer as returned by @code{current-time} or a pair " | |
1652 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1653 | "mutex is locked and @code{#f} is returned. When the condition " | |
1654 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1655 | "is returned. ") | |
1656 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1657 | { |
9de87eea | 1658 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1659 | |
1660 | SCM_VALIDATE_CONDVAR (1, cv); | |
1661 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1662 | |
d823b11b MV |
1663 | if (!SCM_UNBNDP (t)) |
1664 | { | |
6180e336 | 1665 | to_timespec (t, &waittime); |
9de87eea | 1666 | waitptr = &waittime; |
d823b11b MV |
1667 | } |
1668 | ||
2a1d0688 | 1669 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1670 | } |
d823b11b | 1671 | #undef FUNC_NAME |
5f05c406 | 1672 | |
9de87eea MV |
1673 | static void |
1674 | fat_cond_signal (fat_cond *c) | |
1675 | { | |
9de87eea | 1676 | unblock_from_queue (c->waiting); |
9de87eea MV |
1677 | } |
1678 | ||
d823b11b MV |
1679 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1680 | (SCM cv), | |
1681 | "Wake up one thread that is waiting for @var{cv}") | |
1682 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1683 | { |
d823b11b | 1684 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1685 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1686 | return SCM_BOOL_T; |
5f05c406 | 1687 | } |
d823b11b | 1688 | #undef FUNC_NAME |
5f05c406 | 1689 | |
9de87eea MV |
1690 | static void |
1691 | fat_cond_broadcast (fat_cond *c) | |
1692 | { | |
9de87eea MV |
1693 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1694 | ; | |
9de87eea MV |
1695 | } |
1696 | ||
d823b11b MV |
1697 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1698 | (SCM cv), | |
1699 | "Wake up all threads that are waiting for @var{cv}. ") | |
1700 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1701 | { |
d823b11b | 1702 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1703 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1704 | return SCM_BOOL_T; |
5f05c406 | 1705 | } |
d823b11b | 1706 | #undef FUNC_NAME |
5f05c406 | 1707 | |
6180e336 NJ |
1708 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1709 | (SCM obj), | |
1710 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1711 | #define FUNC_NAME s_scm_condition_variable_p | |
1712 | { | |
1713 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1714 | } | |
1715 | #undef FUNC_NAME | |
1716 | ||
d823b11b MV |
1717 | /*** Marking stacks */ |
1718 | ||
1719 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1720 | threads as well? | |
1721 | */ | |
1722 | #ifdef __ia64__ | |
1723 | # define SCM_MARK_BACKING_STORE() do { \ | |
1724 | ucontext_t ctx; \ | |
1725 | SCM_STACKITEM * top, * bot; \ | |
1726 | getcontext (&ctx); \ | |
1727 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1728 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1729 | / sizeof (SCM_STACKITEM))); \ | |
346e4402 | 1730 | bot = (SCM_STACKITEM *) SCM_I_CURRENT_THREAD->register_backing_store_base; \ |
9a5fa6e9 | 1731 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ |
d823b11b MV |
1732 | scm_mark_locations (bot, top - bot); } while (0) |
1733 | #else | |
1734 | # define SCM_MARK_BACKING_STORE() | |
1735 | #endif | |
1736 | ||
6087fad9 | 1737 | |
8c2b3143 | 1738 | \f |
d823b11b MV |
1739 | /*** Select */ |
1740 | ||
8c2b3143 LC |
1741 | struct select_args |
1742 | { | |
1743 | int nfds; | |
1744 | SELECT_TYPE *read_fds; | |
1745 | SELECT_TYPE *write_fds; | |
1746 | SELECT_TYPE *except_fds; | |
1747 | struct timeval *timeout; | |
1748 | ||
1749 | int result; | |
1750 | int errno_value; | |
1751 | }; | |
1752 | ||
1753 | static void * | |
1754 | do_std_select (void *args) | |
1755 | { | |
1756 | struct select_args *select_args; | |
1757 | ||
1758 | select_args = (struct select_args *) args; | |
1759 | ||
1760 | select_args->result = | |
1761 | select (select_args->nfds, | |
1762 | select_args->read_fds, select_args->write_fds, | |
1763 | select_args->except_fds, select_args->timeout); | |
1764 | select_args->errno_value = errno; | |
1765 | ||
1766 | return NULL; | |
1767 | } | |
1768 | ||
911782b7 | 1769 | int |
9de87eea MV |
1770 | scm_std_select (int nfds, |
1771 | SELECT_TYPE *readfds, | |
1772 | SELECT_TYPE *writefds, | |
1773 | SELECT_TYPE *exceptfds, | |
1774 | struct timeval *timeout) | |
1775 | { | |
1776 | fd_set my_readfds; | |
1777 | int res, eno, wakeup_fd; | |
1778 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1779 | struct select_args args; |
9de87eea MV |
1780 | |
1781 | if (readfds == NULL) | |
1782 | { | |
1783 | FD_ZERO (&my_readfds); | |
1784 | readfds = &my_readfds; | |
1785 | } | |
1786 | ||
1787 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1788 | SCM_TICK; | |
1789 | ||
1790 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1791 | FD_SET (wakeup_fd, readfds); |
1792 | if (wakeup_fd >= nfds) | |
1793 | nfds = wakeup_fd+1; | |
9de87eea | 1794 | |
8c2b3143 LC |
1795 | args.nfds = nfds; |
1796 | args.read_fds = readfds; | |
1797 | args.write_fds = writefds; | |
1798 | args.except_fds = exceptfds; | |
1799 | args.timeout = timeout; | |
1800 | ||
1801 | /* Explicitly cooperate with the GC. */ | |
1802 | scm_without_guile (do_std_select, &args); | |
1803 | ||
1804 | res = args.result; | |
1805 | eno = args.errno_value; | |
1806 | ||
1807 | t->sleep_fd = -1; | |
9de87eea MV |
1808 | scm_i_reset_sleep (t); |
1809 | ||
1810 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1811 | { | |
1812 | char dummy; | |
634aa8de LC |
1813 | full_read (wakeup_fd, &dummy, 1); |
1814 | ||
9de87eea MV |
1815 | FD_CLR (wakeup_fd, readfds); |
1816 | res -= 1; | |
1817 | if (res == 0) | |
1818 | { | |
1819 | eno = EINTR; | |
1820 | res = -1; | |
1821 | } | |
1822 | } | |
d823b11b MV |
1823 | errno = eno; |
1824 | return res; | |
5f05c406 MV |
1825 | } |
1826 | ||
9de87eea | 1827 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1828 | |
9de87eea | 1829 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1830 | |
2956b071 LC |
1831 | /* It seems reasonable to not run procedures related to mutex and condition |
1832 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1833 | without it, and (ii) the only potential gain would be GC latency. See | |
1834 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1835 | for a discussion of the pros and cons. */ | |
1836 | ||
9bc4701c | 1837 | int |
9de87eea | 1838 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1839 | { |
9de87eea | 1840 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1841 | return res; |
1842 | } | |
1843 | ||
9de87eea | 1844 | static void |
2b829bbb | 1845 | do_unlock (void *data) |
28d52ebb | 1846 | { |
9de87eea | 1847 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1848 | } |
1849 | ||
1850 | void | |
661ae7ab | 1851 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1852 | { |
9de87eea | 1853 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1854 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1855 | } |
1856 | ||
9bc4701c | 1857 | int |
9de87eea | 1858 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1859 | { |
9de87eea | 1860 | scm_t_guile_ticket t = scm_leave_guile (); |
d2a51087 | 1861 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1862 | int res = scm_i_pthread_cond_wait (cond, mutex); |
d2a51087 | 1863 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea | 1864 | scm_enter_guile (t); |
9bc4701c MD |
1865 | return res; |
1866 | } | |
9bc4701c | 1867 | |
76da80e7 | 1868 | int |
9de87eea MV |
1869 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1870 | scm_i_pthread_mutex_t *mutex, | |
1871 | const scm_t_timespec *wt) | |
76da80e7 | 1872 | { |
9de87eea | 1873 | scm_t_guile_ticket t = scm_leave_guile (); |
d2a51087 | 1874 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1875 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); |
d2a51087 | 1876 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea MV |
1877 | scm_enter_guile (t); |
1878 | return res; | |
76da80e7 MV |
1879 | } |
1880 | ||
9de87eea | 1881 | #endif |
76da80e7 | 1882 | |
d823b11b | 1883 | unsigned long |
9de87eea | 1884 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1885 | { |
d823b11b MV |
1886 | struct timeval tv; |
1887 | tv.tv_usec = usecs % 1000000; | |
1888 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1889 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1890 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1891 | } |
1892 | ||
9de87eea MV |
1893 | unsigned int |
1894 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1895 | { |
d823b11b MV |
1896 | struct timeval tv; |
1897 | tv.tv_usec = 0; | |
1898 | tv.tv_sec = secs; | |
9de87eea | 1899 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1900 | return tv.tv_sec; |
6c214b62 MD |
1901 | } |
1902 | ||
d823b11b MV |
1903 | /*** Misc */ |
1904 | ||
1905 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1906 | (void), | |
1907 | "Return the thread that called this function.") | |
1908 | #define FUNC_NAME s_scm_current_thread | |
1909 | { | |
9de87eea | 1910 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1911 | } |
1912 | #undef FUNC_NAME | |
1913 | ||
9de87eea MV |
1914 | static SCM |
1915 | scm_c_make_list (size_t n, SCM fill) | |
1916 | { | |
1917 | SCM res = SCM_EOL; | |
1918 | while (n-- > 0) | |
1919 | res = scm_cons (fill, res); | |
1920 | return res; | |
1921 | } | |
1922 | ||
d823b11b MV |
1923 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1924 | (void), | |
1925 | "Return a list of all threads.") | |
9bc4701c | 1926 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1927 | { |
9de87eea MV |
1928 | /* We can not allocate while holding the thread_admin_mutex because |
1929 | of the way GC is done. | |
1930 | */ | |
1931 | int n = thread_count; | |
1932 | scm_i_thread *t; | |
1933 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1934 | |
9de87eea MV |
1935 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1936 | l = &list; | |
1937 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1938 | { | |
2e77f720 LC |
1939 | if (t != scm_i_signal_delivery_thread) |
1940 | { | |
1941 | SCM_SETCAR (*l, t->handle); | |
1942 | l = SCM_CDRLOC (*l); | |
1943 | } | |
9de87eea MV |
1944 | n--; |
1945 | } | |
1946 | *l = SCM_EOL; | |
1947 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1948 | return list; | |
d823b11b | 1949 | } |
9de87eea | 1950 | #undef FUNC_NAME |
d823b11b MV |
1951 | |
1952 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1953 | (SCM thread), | |
1954 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1955 | #define FUNC_NAME s_scm_thread_exited_p | |
1956 | { | |
7888309b | 1957 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1958 | } |
1959 | #undef FUNC_NAME | |
1960 | ||
911782b7 | 1961 | int |
d823b11b MV |
1962 | scm_c_thread_exited_p (SCM thread) |
1963 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1964 | { |
9de87eea | 1965 | scm_i_thread *t; |
d823b11b | 1966 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1967 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1968 | return t->exited; |
5f05c406 | 1969 | } |
d823b11b | 1970 | #undef FUNC_NAME |
5f05c406 | 1971 | |
9de87eea | 1972 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
1973 | static int threads_initialized_p = 0; |
1974 | ||
9bc4701c | 1975 | |
a4d106c7 MV |
1976 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1977 | */ | |
d1138028 | 1978 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1979 | int scm_i_critical_section_level = 0; |
1980 | ||
661ae7ab | 1981 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1982 | |
9bc4701c | 1983 | void |
661ae7ab | 1984 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1985 | { |
a4d106c7 | 1986 | if (scm_is_false (mutex)) |
661ae7ab MV |
1987 | mutex = dynwind_critical_section_mutex; |
1988 | scm_dynwind_lock_mutex (mutex); | |
1989 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
1990 | } |
1991 | ||
1992 | /*** Initialization */ | |
1993 | ||
9de87eea MV |
1994 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
1995 | ||
d1138028 MV |
1996 | #if SCM_USE_PTHREAD_THREADS |
1997 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
1998 | #endif | |
1999 | ||
9de87eea MV |
2000 | void |
2001 | scm_threads_prehistory (SCM_STACKITEM *base) | |
2002 | { | |
d1138028 MV |
2003 | #if SCM_USE_PTHREAD_THREADS |
2004 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2005 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2006 | PTHREAD_MUTEX_RECURSIVE); | |
2007 | #endif | |
2008 | ||
2009 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2010 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2011 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2012 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2013 | |
9de87eea | 2014 | guilify_self_1 (base); |
9bc4701c MD |
2015 | } |
2016 | ||
d823b11b MV |
2017 | scm_t_bits scm_tc16_thread; |
2018 | scm_t_bits scm_tc16_mutex; | |
2019 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2020 | |
7bfd3b9e | 2021 | void |
9de87eea | 2022 | scm_init_threads () |
7bfd3b9e | 2023 | { |
9de87eea | 2024 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2025 | scm_set_smob_print (scm_tc16_thread, thread_print); |
a4a141f6 | 2026 | scm_set_smob_free (scm_tc16_thread, thread_free); /* XXX: Could be removed */ |
d823b11b | 2027 | |
9de87eea | 2028 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
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)); | |
9de87eea MV |
2034 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
2035 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 2036 | |
9de87eea MV |
2037 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2038 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2039 | threads_initialized_p = 1; |
a4d106c7 | 2040 | |
661ae7ab | 2041 | dynwind_critical_section_mutex = |
a4d106c7 | 2042 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 2043 | } |
89e00824 | 2044 | |
5f05c406 | 2045 | void |
9de87eea | 2046 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2047 | { |
9de87eea MV |
2048 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
2049 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
2050 | } |
2051 | ||
d823b11b | 2052 | void |
9de87eea | 2053 | scm_init_thread_procs () |
d823b11b | 2054 | { |
9de87eea | 2055 | #include "libguile/threads.x" |
d823b11b MV |
2056 | } |
2057 | ||
89e00824 ML |
2058 | /* |
2059 | Local Variables: | |
2060 | c-file-style: "gnu" | |
2061 | End: | |
2062 | */ |