Commit | Line | Data |
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3c13664e | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
74926120 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
7bfd3b9e | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
7bfd3b9e | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
7bfd3b9e | 20 | \f |
dbb605f5 LC |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
7bfd3b9e | 24 | |
e7bca227 | 25 | #include "libguile/boehm-gc.h" |
1810dc4e RB |
26 | #include "libguile/_scm.h" |
27 | ||
fcc5d734 | 28 | #if HAVE_UNISTD_H |
d823b11b | 29 | #include <unistd.h> |
fcc5d734 | 30 | #endif |
d823b11b MV |
31 | #include <stdio.h> |
32 | #include <assert.h> | |
8ab3d8a0 KR |
33 | |
34 | #ifdef HAVE_STRING_H | |
35 | #include <string.h> /* for memset used by FD_ZERO on Solaris 10 */ | |
36 | #endif | |
37 | ||
fcc5d734 | 38 | #if HAVE_SYS_TIME_H |
d823b11b | 39 | #include <sys/time.h> |
fcc5d734 | 40 | #endif |
5f05c406 | 41 | |
d823b11b MV |
42 | #include "libguile/validate.h" |
43 | #include "libguile/root.h" | |
44 | #include "libguile/eval.h" | |
45 | #include "libguile/async.h" | |
46 | #include "libguile/ports.h" | |
47 | #include "libguile/threads.h" | |
a0599745 | 48 | #include "libguile/dynwind.h" |
d823b11b | 49 | #include "libguile/iselect.h" |
9de87eea MV |
50 | #include "libguile/fluids.h" |
51 | #include "libguile/continuations.h" | |
2b829bbb | 52 | #include "libguile/gc.h" |
9de87eea | 53 | #include "libguile/init.h" |
2e77f720 | 54 | #include "libguile/scmsigs.h" |
6180e336 | 55 | #include "libguile/strings.h" |
7bfd3b9e | 56 | |
ecc9f40f MV |
57 | #ifdef __MINGW32__ |
58 | #ifndef ETIMEDOUT | |
59 | # define ETIMEDOUT WSAETIMEDOUT | |
60 | #endif | |
61 | # include <fcntl.h> | |
62 | # include <process.h> | |
63 | # define pipe(fd) _pipe (fd, 256, O_BINARY) | |
64 | #endif /* __MINGW32__ */ | |
65 | ||
634aa8de LC |
66 | #include <full-read.h> |
67 | ||
68 | \f | |
6180e336 NJ |
69 | static void |
70 | to_timespec (SCM t, scm_t_timespec *waittime) | |
71 | { | |
72 | if (scm_is_pair (t)) | |
73 | { | |
74 | waittime->tv_sec = scm_to_ulong (SCM_CAR (t)); | |
75 | waittime->tv_nsec = scm_to_ulong (SCM_CDR (t)) * 1000; | |
76 | } | |
77 | else | |
78 | { | |
79 | double time = scm_to_double (t); | |
80 | double sec = scm_c_truncate (time); | |
81 | ||
82 | waittime->tv_sec = (long) sec; | |
2a1d0688 | 83 | waittime->tv_nsec = (long) ((time - sec) * 1000000000); |
6180e336 NJ |
84 | } |
85 | } | |
86 | ||
d823b11b | 87 | /*** Queues */ |
7bfd3b9e | 88 | |
9de87eea MV |
89 | /* Make an empty queue data structure. |
90 | */ | |
d823b11b MV |
91 | static SCM |
92 | make_queue () | |
93 | { | |
94 | return scm_cons (SCM_EOL, SCM_EOL); | |
95 | } | |
7bfd3b9e | 96 | |
9de87eea MV |
97 | /* Put T at the back of Q and return a handle that can be used with |
98 | remqueue to remove T from Q again. | |
99 | */ | |
d823b11b MV |
100 | static SCM |
101 | enqueue (SCM q, SCM t) | |
102 | { | |
103 | SCM c = scm_cons (t, SCM_EOL); | |
d2a51087 | 104 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 105 | if (scm_is_null (SCM_CDR (q))) |
d823b11b MV |
106 | SCM_SETCDR (q, c); |
107 | else | |
108 | SCM_SETCDR (SCM_CAR (q), c); | |
109 | SCM_SETCAR (q, c); | |
d2a51087 | 110 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
111 | return c; |
112 | } | |
7bfd3b9e | 113 | |
9de87eea MV |
114 | /* Remove the element that the handle C refers to from the queue Q. C |
115 | must have been returned from a call to enqueue. The return value | |
116 | is zero when the element referred to by C has already been removed. | |
117 | Otherwise, 1 is returned. | |
118 | */ | |
119 | static int | |
d823b11b MV |
120 | remqueue (SCM q, SCM c) |
121 | { | |
122 | SCM p, prev = q; | |
d2a51087 | 123 | SCM_CRITICAL_SECTION_START; |
d2e53ed6 | 124 | for (p = SCM_CDR (q); !scm_is_null (p); p = SCM_CDR (p)) |
d823b11b | 125 | { |
bc36d050 | 126 | if (scm_is_eq (p, c)) |
d823b11b | 127 | { |
bc36d050 | 128 | if (scm_is_eq (c, SCM_CAR (q))) |
d823b11b MV |
129 | SCM_SETCAR (q, SCM_CDR (c)); |
130 | SCM_SETCDR (prev, SCM_CDR (c)); | |
d2a51087 | 131 | SCM_CRITICAL_SECTION_END; |
9de87eea | 132 | return 1; |
d823b11b MV |
133 | } |
134 | prev = p; | |
135 | } | |
d2a51087 | 136 | SCM_CRITICAL_SECTION_END; |
9de87eea | 137 | return 0; |
d823b11b MV |
138 | } |
139 | ||
9de87eea MV |
140 | /* Remove the front-most element from the queue Q and return it. |
141 | Return SCM_BOOL_F when Q is empty. | |
142 | */ | |
d823b11b MV |
143 | static SCM |
144 | dequeue (SCM q) | |
145 | { | |
d2a51087 NJ |
146 | SCM c; |
147 | SCM_CRITICAL_SECTION_START; | |
148 | c = SCM_CDR (q); | |
d2e53ed6 | 149 | if (scm_is_null (c)) |
d2a51087 NJ |
150 | { |
151 | SCM_CRITICAL_SECTION_END; | |
152 | return SCM_BOOL_F; | |
153 | } | |
d823b11b MV |
154 | else |
155 | { | |
156 | SCM_SETCDR (q, SCM_CDR (c)); | |
d2e53ed6 | 157 | if (scm_is_null (SCM_CDR (q))) |
d823b11b | 158 | SCM_SETCAR (q, SCM_EOL); |
d2a51087 | 159 | SCM_CRITICAL_SECTION_END; |
d823b11b MV |
160 | return SCM_CAR (c); |
161 | } | |
162 | } | |
7bfd3b9e | 163 | |
9de87eea | 164 | /*** Thread smob routines */ |
76da80e7 | 165 | |
d823b11b MV |
166 | |
167 | static int | |
168 | thread_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
169 | { | |
23d72566 KR |
170 | /* On a Gnu system pthread_t is an unsigned long, but on mingw it's a |
171 | struct. A cast like "(unsigned long) t->pthread" is a syntax error in | |
172 | the struct case, hence we go via a union, and extract according to the | |
173 | size of pthread_t. */ | |
174 | union { | |
175 | scm_i_pthread_t p; | |
176 | unsigned short us; | |
177 | unsigned int ui; | |
178 | unsigned long ul; | |
179 | scm_t_uintmax um; | |
180 | } u; | |
9de87eea | 181 | scm_i_thread *t = SCM_I_THREAD_DATA (exp); |
23d72566 KR |
182 | scm_i_pthread_t p = t->pthread; |
183 | scm_t_uintmax id; | |
184 | u.p = p; | |
185 | if (sizeof (p) == sizeof (unsigned short)) | |
186 | id = u.us; | |
187 | else if (sizeof (p) == sizeof (unsigned int)) | |
188 | id = u.ui; | |
189 | else if (sizeof (p) == sizeof (unsigned long)) | |
190 | id = u.ul; | |
191 | else | |
192 | id = u.um; | |
193 | ||
d823b11b | 194 | scm_puts ("#<thread ", port); |
23d72566 | 195 | scm_uintprint (id, 10, port); |
1b92fb6b | 196 | scm_puts (" (", port); |
0345e278 | 197 | scm_uintprint ((scm_t_bits)t, 16, port); |
1b92fb6b | 198 | scm_puts (")>", port); |
d823b11b MV |
199 | return 1; |
200 | } | |
201 | ||
202 | static size_t | |
203 | thread_free (SCM obj) | |
204 | { | |
9de87eea MV |
205 | scm_i_thread *t = SCM_I_THREAD_DATA (obj); |
206 | assert (t->exited); | |
d823b11b MV |
207 | scm_gc_free (t, sizeof (*t), "thread"); |
208 | return 0; | |
209 | } | |
210 | ||
9de87eea | 211 | /*** Blocking on queues. */ |
f7eca35d | 212 | |
9de87eea MV |
213 | /* See also scm_i_queue_async_cell for how such a block is |
214 | interrputed. | |
215 | */ | |
d823b11b | 216 | |
9de87eea MV |
217 | /* Put the current thread on QUEUE and go to sleep, waiting for it to |
218 | be woken up by a call to 'unblock_from_queue', or to be | |
219 | interrupted. Upon return of this function, the current thread is | |
220 | no longer on QUEUE, even when the sleep has been interrupted. | |
221 | ||
d2a51087 | 222 | The caller of block_self must hold MUTEX. It will be atomically |
9de87eea MV |
223 | unlocked while sleeping, just as with scm_i_pthread_cond_wait. |
224 | ||
225 | SLEEP_OBJECT is an arbitrary SCM value that is kept alive as long | |
226 | as MUTEX is needed. | |
227 | ||
228 | When WAITTIME is not NULL, the sleep will be aborted at that time. | |
229 | ||
230 | The return value of block_self is an errno value. It will be zero | |
231 | when the sleep has been successfully completed by a call to | |
232 | unblock_from_queue, EINTR when it has been interrupted by the | |
233 | delivery of a system async, and ETIMEDOUT when the timeout has | |
234 | expired. | |
235 | ||
236 | The system asyncs themselves are not executed by block_self. | |
237 | */ | |
238 | static int | |
239 | block_self (SCM queue, SCM sleep_object, scm_i_pthread_mutex_t *mutex, | |
240 | const scm_t_timespec *waittime) | |
76da80e7 | 241 | { |
9de87eea MV |
242 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
243 | SCM q_handle; | |
244 | int err; | |
245 | ||
246 | if (scm_i_setup_sleep (t, sleep_object, mutex, -1)) | |
247 | err = EINTR; | |
248 | else | |
249 | { | |
250 | t->block_asyncs++; | |
251 | q_handle = enqueue (queue, t->handle); | |
252 | if (waittime == NULL) | |
253 | err = scm_i_scm_pthread_cond_wait (&t->sleep_cond, mutex); | |
254 | else | |
255 | err = scm_i_scm_pthread_cond_timedwait (&t->sleep_cond, mutex, waittime); | |
256 | ||
257 | /* When we are still on QUEUE, we have been interrupted. We | |
258 | report this only when no other error (such as a timeout) has | |
259 | happened above. | |
260 | */ | |
261 | if (remqueue (queue, q_handle) && err == 0) | |
262 | err = EINTR; | |
263 | t->block_asyncs--; | |
264 | scm_i_reset_sleep (t); | |
265 | } | |
266 | ||
267 | return err; | |
76da80e7 | 268 | } |
9de87eea | 269 | |
d2a51087 NJ |
270 | /* Wake up the first thread on QUEUE, if any. The awoken thread is |
271 | returned, or #f if the queue was empty. | |
9de87eea MV |
272 | */ |
273 | static SCM | |
274 | unblock_from_queue (SCM queue) | |
275 | { | |
276 | SCM thread = dequeue (queue); | |
277 | if (scm_is_true (thread)) | |
278 | scm_i_pthread_cond_signal (&SCM_I_THREAD_DATA(thread)->sleep_cond); | |
279 | return thread; | |
280 | } | |
281 | ||
282 | /* Getting into and out of guile mode. | |
283 | */ | |
284 | ||
98648121 MV |
285 | /* Ken Raeburn observes that the implementation of suspend and resume |
286 | (and the things that build on top of them) are very likely not | |
287 | correct (see below). We will need fix this eventually, and that's | |
288 | why scm_leave_guile/scm_enter_guile are not exported in the API. | |
289 | ||
290 | Ken writes: | |
291 | ||
292 | Consider this sequence: | |
293 | ||
294 | Function foo, called in Guile mode, calls suspend (maybe indirectly | |
295 | through scm_leave_guile), which does this: | |
296 | ||
297 | // record top of stack for the GC | |
298 | t->top = SCM_STACK_PTR (&t); // just takes address of automatic | |
299 | var 't' | |
300 | // save registers. | |
301 | SCM_FLUSH_REGISTER_WINDOWS; // sparc only | |
a4dbe1ac | 302 | SCM_I_SETJMP (t->regs); // here's most of the magic |
98648121 MV |
303 | |
304 | ... and returns. | |
305 | ||
306 | Function foo has a SCM value X, a handle on a non-immediate object, in | |
307 | a caller-saved register R, and it's the only reference to the object | |
308 | currently. | |
309 | ||
310 | The compiler wants to use R in suspend, so it pushes the current | |
311 | value, X, into a stack slot which will be reloaded on exit from | |
312 | suspend; then it loads stuff into R and goes about its business. The | |
313 | setjmp call saves (some of) the current registers, including R, which | |
314 | no longer contains X. (This isn't a problem for a normal | |
315 | setjmp/longjmp situation, where longjmp would be called before | |
316 | setjmp's caller returns; the old value for X would be loaded back from | |
317 | the stack after the longjmp, before the function returned.) | |
318 | ||
319 | So, suspend returns, loading X back into R (and invalidating the jump | |
320 | buffer) in the process. The caller foo then goes off and calls a | |
321 | bunch of other functions out of Guile mode, occasionally storing X on | |
322 | the stack again, but, say, much deeper on the stack than suspend's | |
323 | stack frame went, and the stack slot where suspend had written X has | |
324 | long since been overwritten with other values. | |
325 | ||
326 | Okay, nothing actively broken so far. Now, let garbage collection | |
327 | run, triggered by another thread. | |
328 | ||
329 | The thread calling foo is out of Guile mode at the time, so the | |
330 | garbage collector just scans a range of stack addresses. Too bad that | |
331 | X isn't stored there. So the pointed-to storage goes onto the free | |
332 | list, and I think you can see where things go from there. | |
333 | ||
334 | Is there anything I'm missing that'll prevent this scenario from | |
335 | happening? I mean, aside from, "well, suspend and scm_leave_guile | |
336 | don't have many local variables, so they probably won't need to save | |
337 | any registers on most systems, so we hope everything will wind up in | |
338 | the jump buffer and we'll just get away with it"? | |
339 | ||
340 | (And, going the other direction, if scm_leave_guile and suspend push | |
341 | the stack pointer over onto a new page, and foo doesn't make further | |
342 | function calls and thus the stack pointer no longer includes that | |
343 | page, are we guaranteed that the kernel cannot release the now-unused | |
344 | stack page that contains the top-of-stack pointer we just saved? I | |
345 | don't know if any OS actually does that. If it does, we could get | |
346 | faults in garbage collection.) | |
347 | ||
348 | I don't think scm_without_guile has to have this problem, as it gets | |
349 | more control over the stack handling -- but it should call setjmp | |
350 | itself. I'd probably try something like: | |
351 | ||
352 | // record top of stack for the GC | |
353 | t->top = SCM_STACK_PTR (&t); | |
354 | // save registers. | |
355 | SCM_FLUSH_REGISTER_WINDOWS; | |
a4dbe1ac | 356 | SCM_I_SETJMP (t->regs); |
98648121 MV |
357 | res = func(data); |
358 | scm_enter_guile (t); | |
359 | ||
360 | ... though even that's making some assumptions about the stack | |
361 | ordering of local variables versus caller-saved registers. | |
362 | ||
363 | For something like scm_leave_guile to work, I don't think it can just | |
364 | rely on invalidated jump buffers. A valid jump buffer, and a handle | |
365 | on the stack state at the point when the jump buffer was initialized, | |
366 | together, would work fine, but I think then we're talking about macros | |
367 | invoking setjmp in the caller's stack frame, and requiring that the | |
368 | caller of scm_leave_guile also call scm_enter_guile before returning, | |
369 | kind of like pthread_cleanup_push/pop calls that have to be paired up | |
370 | in a function. (In fact, the pthread ones have to be paired up | |
371 | syntactically, as if they might expand to a compound statement | |
372 | incorporating the user's code, and invoking a compiler's | |
373 | exception-handling primitives. Which might be something to think | |
374 | about for cases where Guile is used with C++ exceptions or | |
375 | pthread_cancel.) | |
376 | */ | |
377 | ||
9de87eea MV |
378 | scm_i_pthread_key_t scm_i_thread_key; |
379 | ||
d823b11b | 380 | static void |
9de87eea | 381 | resume (scm_i_thread *t) |
d823b11b | 382 | { |
d823b11b MV |
383 | t->top = NULL; |
384 | } | |
385 | ||
98648121 MV |
386 | typedef void* scm_t_guile_ticket; |
387 | ||
388 | static void | |
9de87eea | 389 | scm_enter_guile (scm_t_guile_ticket ticket) |
d823b11b | 390 | { |
9de87eea MV |
391 | scm_i_thread *t = (scm_i_thread *)ticket; |
392 | if (t) | |
393 | { | |
9de87eea MV |
394 | resume (t); |
395 | } | |
d823b11b MV |
396 | } |
397 | ||
9de87eea MV |
398 | static scm_i_thread * |
399 | suspend (void) | |
d823b11b | 400 | { |
9de87eea | 401 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
d823b11b MV |
402 | |
403 | /* record top of stack for the GC */ | |
9de87eea | 404 | t->top = SCM_STACK_PTR (&t); |
d823b11b MV |
405 | /* save registers. */ |
406 | SCM_FLUSH_REGISTER_WINDOWS; | |
a4dbe1ac | 407 | SCM_I_SETJMP (t->regs); |
9de87eea | 408 | return t; |
d823b11b MV |
409 | } |
410 | ||
98648121 | 411 | static scm_t_guile_ticket |
9de87eea | 412 | scm_leave_guile () |
d823b11b | 413 | { |
9de87eea | 414 | scm_i_thread *t = suspend (); |
9de87eea | 415 | return (scm_t_guile_ticket) t; |
d823b11b MV |
416 | } |
417 | ||
9de87eea MV |
418 | static scm_i_pthread_mutex_t thread_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
419 | static scm_i_thread *all_threads = NULL; | |
420 | static int thread_count; | |
421 | ||
422 | static SCM scm_i_default_dynamic_state; | |
423 | ||
424 | /* Perform first stage of thread initialisation, in non-guile mode. | |
d823b11b | 425 | */ |
9de87eea MV |
426 | static void |
427 | guilify_self_1 (SCM_STACKITEM *base) | |
d823b11b | 428 | { |
c812243b | 429 | scm_i_thread *t = scm_gc_malloc (sizeof (scm_i_thread), "thread"); |
9de87eea MV |
430 | |
431 | t->pthread = scm_i_pthread_self (); | |
432 | t->handle = SCM_BOOL_F; | |
433 | t->result = SCM_BOOL_F; | |
2e77f720 | 434 | t->cleanup_handler = SCM_BOOL_F; |
6180e336 | 435 | t->mutexes = SCM_EOL; |
d2a51087 | 436 | t->held_mutex = NULL; |
9de87eea MV |
437 | t->join_queue = SCM_EOL; |
438 | t->dynamic_state = SCM_BOOL_F; | |
439 | t->dynwinds = SCM_EOL; | |
440 | t->active_asyncs = SCM_EOL; | |
9de87eea MV |
441 | t->block_asyncs = 1; |
442 | t->pending_asyncs = 1; | |
443 | t->last_debug_frame = NULL; | |
444 | t->base = base; | |
346e4402 NJ |
445 | #ifdef __ia64__ |
446 | /* Calculate and store off the base of this thread's register | |
447 | backing store (RBS). Unfortunately our implementation(s) of | |
448 | scm_ia64_register_backing_store_base are only reliable for the | |
449 | main thread. For other threads, therefore, find out the current | |
450 | top of the RBS, and use that as a maximum. */ | |
451 | t->register_backing_store_base = scm_ia64_register_backing_store_base (); | |
452 | { | |
453 | ucontext_t ctx; | |
454 | void *bsp; | |
455 | getcontext (&ctx); | |
456 | bsp = scm_ia64_ar_bsp (&ctx); | |
457 | if (t->register_backing_store_base > bsp) | |
458 | t->register_backing_store_base = bsp; | |
459 | } | |
460 | #endif | |
0c97d7dd | 461 | t->continuation_root = SCM_EOL; |
9de87eea MV |
462 | t->continuation_base = base; |
463 | scm_i_pthread_cond_init (&t->sleep_cond, NULL); | |
464 | t->sleep_mutex = NULL; | |
465 | t->sleep_object = SCM_BOOL_F; | |
466 | t->sleep_fd = -1; | |
634aa8de LC |
467 | |
468 | if (pipe (t->sleep_pipe) != 0) | |
469 | /* FIXME: Error conditions during the initialization phase are handled | |
470 | gracelessly since public functions such as `scm_init_guile ()' | |
471 | currently have type `void'. */ | |
472 | abort (); | |
473 | ||
86a597f8 | 474 | scm_i_pthread_mutex_init (&t->admin_mutex, NULL); |
378f2625 LC |
475 | t->current_mark_stack_ptr = NULL; |
476 | t->current_mark_stack_limit = NULL; | |
2e77f720 | 477 | t->canceled = 0; |
9de87eea | 478 | t->exited = 0; |
72e6b608 | 479 | t->guile_mode = 0; |
9de87eea | 480 | |
9de87eea MV |
481 | scm_i_pthread_setspecific (scm_i_thread_key, t); |
482 | ||
9de87eea MV |
483 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
484 | t->next_thread = all_threads; | |
485 | all_threads = t; | |
486 | thread_count++; | |
487 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
d823b11b MV |
488 | } |
489 | ||
9de87eea | 490 | /* Perform second stage of thread initialisation, in guile mode. |
d823b11b | 491 | */ |
9de87eea MV |
492 | static void |
493 | guilify_self_2 (SCM parent) | |
d823b11b | 494 | { |
9de87eea MV |
495 | scm_i_thread *t = SCM_I_CURRENT_THREAD; |
496 | ||
72e6b608 LC |
497 | t->guile_mode = 1; |
498 | ||
9de87eea | 499 | SCM_NEWSMOB (t->handle, scm_tc16_thread, t); |
c812243b | 500 | |
9de87eea MV |
501 | t->continuation_root = scm_cons (t->handle, SCM_EOL); |
502 | t->continuation_base = t->base; | |
2bbe1533 | 503 | t->vm = SCM_BOOL_F; |
9de87eea MV |
504 | |
505 | if (scm_is_true (parent)) | |
506 | t->dynamic_state = scm_make_dynamic_state (parent); | |
507 | else | |
508 | t->dynamic_state = scm_i_make_initial_dynamic_state (); | |
509 | ||
510 | t->join_queue = make_queue (); | |
511 | t->block_asyncs = 0; | |
d823b11b MV |
512 | } |
513 | ||
6180e336 NJ |
514 | \f |
515 | /*** Fat mutexes */ | |
516 | ||
517 | /* We implement our own mutex type since we want them to be 'fair', we | |
518 | want to do fancy things while waiting for them (like running | |
519 | asyncs) and we might want to add things that are nice for | |
520 | debugging. | |
521 | */ | |
522 | ||
523 | typedef struct { | |
524 | scm_i_pthread_mutex_t lock; | |
525 | SCM owner; | |
adc085f1 | 526 | int level; /* how much the owner owns us. <= 1 for non-recursive mutexes */ |
6180e336 | 527 | |
adc085f1 | 528 | int recursive; /* allow recursive locking? */ |
6180e336 NJ |
529 | int unchecked_unlock; /* is it an error to unlock an unlocked mutex? */ |
530 | int allow_external_unlock; /* is it an error to unlock a mutex that is not | |
531 | owned by the current thread? */ | |
532 | ||
533 | SCM waiting; /* the threads waiting for this mutex. */ | |
534 | } fat_mutex; | |
535 | ||
536 | #define SCM_MUTEXP(x) SCM_SMOB_PREDICATE (scm_tc16_mutex, x) | |
537 | #define SCM_MUTEX_DATA(x) ((fat_mutex *) SCM_SMOB_DATA (x)) | |
538 | ||
9de87eea | 539 | /* Perform thread tear-down, in guile mode. |
d823b11b | 540 | */ |
9de87eea MV |
541 | static void * |
542 | do_thread_exit (void *v) | |
543 | { | |
2e77f720 LC |
544 | scm_i_thread *t = (scm_i_thread *) v; |
545 | ||
546 | if (!scm_is_false (t->cleanup_handler)) | |
547 | { | |
548 | SCM ptr = t->cleanup_handler; | |
549 | ||
550 | t->cleanup_handler = SCM_BOOL_F; | |
551 | t->result = scm_internal_catch (SCM_BOOL_T, | |
552 | (scm_t_catch_body) scm_call_0, ptr, | |
553 | scm_handle_by_message_noexit, NULL); | |
554 | } | |
9de87eea | 555 | |
86a597f8 | 556 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
9de87eea MV |
557 | |
558 | t->exited = 1; | |
0c97d7dd MV |
559 | close (t->sleep_pipe[0]); |
560 | close (t->sleep_pipe[1]); | |
9de87eea MV |
561 | while (scm_is_true (unblock_from_queue (t->join_queue))) |
562 | ; | |
9de87eea | 563 | |
74926120 | 564 | while (!scm_is_null (t->mutexes)) |
6180e336 NJ |
565 | { |
566 | SCM mutex = SCM_CAR (t->mutexes); | |
567 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
568 | scm_i_pthread_mutex_lock (&m->lock); | |
74926120 | 569 | |
6180e336 NJ |
570 | unblock_from_queue (m->waiting); |
571 | ||
74926120 | 572 | scm_i_pthread_mutex_unlock (&m->lock); |
6180e336 NJ |
573 | t->mutexes = SCM_CDR (t->mutexes); |
574 | } | |
575 | ||
86a597f8 | 576 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 577 | |
9de87eea MV |
578 | return NULL; |
579 | } | |
580 | ||
d823b11b | 581 | static void |
9de87eea | 582 | on_thread_exit (void *v) |
d823b11b | 583 | { |
29776e85 | 584 | /* This handler is executed in non-guile mode. */ |
2e77f720 | 585 | scm_i_thread *t = (scm_i_thread *) v, **tp; |
0c97d7dd | 586 | |
d2a51087 NJ |
587 | /* If this thread was cancelled while doing a cond wait, it will |
588 | still have a mutex locked, so we unlock it here. */ | |
589 | if (t->held_mutex) | |
590 | { | |
591 | scm_i_pthread_mutex_unlock (t->held_mutex); | |
592 | t->held_mutex = NULL; | |
593 | } | |
594 | ||
9de87eea | 595 | scm_i_pthread_setspecific (scm_i_thread_key, v); |
0c97d7dd | 596 | |
2e77f720 LC |
597 | /* Ensure the signal handling thread has been launched, because we might be |
598 | shutting it down. */ | |
599 | scm_i_ensure_signal_delivery_thread (); | |
600 | ||
0c97d7dd | 601 | /* Unblocking the joining threads needs to happen in guile mode |
29776e85 | 602 | since the queue is a SCM data structure. */ |
35747a3e | 603 | |
47b6e9bd LC |
604 | /* Note: Since `do_thread_exit ()' uses allocates memory via `libgc', we |
605 | assume the GC is usable at this point, and notably that thread-local | |
606 | storage (TLS) hasn't been deallocated yet. */ | |
607 | do_thread_exit (v); | |
0c97d7dd MV |
608 | |
609 | /* Removing ourself from the list of all threads needs to happen in | |
610 | non-guile mode since all SCM values on our stack become | |
29776e85 | 611 | unprotected once we are no longer in the list. */ |
0c97d7dd MV |
612 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
613 | for (tp = &all_threads; *tp; tp = &(*tp)->next_thread) | |
614 | if (*tp == t) | |
615 | { | |
616 | *tp = t->next_thread; | |
617 | break; | |
618 | } | |
619 | thread_count--; | |
2e77f720 LC |
620 | |
621 | /* If there's only one other thread, it could be the signal delivery | |
622 | thread, so we need to notify it to shut down by closing its read pipe. | |
623 | If it's not the signal delivery thread, then closing the read pipe isn't | |
624 | going to hurt. */ | |
625 | if (thread_count <= 1) | |
626 | scm_i_close_signal_pipe (); | |
627 | ||
0c97d7dd MV |
628 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); |
629 | ||
9de87eea | 630 | scm_i_pthread_setspecific (scm_i_thread_key, NULL); |
d823b11b MV |
631 | } |
632 | ||
9de87eea | 633 | static scm_i_pthread_once_t init_thread_key_once = SCM_I_PTHREAD_ONCE_INIT; |
d823b11b | 634 | |
9de87eea MV |
635 | static void |
636 | init_thread_key (void) | |
637 | { | |
47b6e9bd | 638 | scm_i_pthread_key_create (&scm_i_thread_key, NULL); |
9de87eea | 639 | } |
d823b11b | 640 | |
9de87eea MV |
641 | /* Perform any initializations necessary to bring the current thread |
642 | into guile mode, initializing Guile itself, if necessary. | |
a54a94b3 | 643 | |
9de87eea MV |
644 | BASE is the stack base to use with GC. |
645 | ||
646 | PARENT is the dynamic state to use as the parent, ot SCM_BOOL_F in | |
647 | which case the default dynamic state is used. | |
648 | ||
649 | Return zero when the thread was in guile mode already; otherwise | |
650 | return 1. | |
651 | */ | |
652 | ||
653 | static int | |
654 | scm_i_init_thread_for_guile (SCM_STACKITEM *base, SCM parent) | |
d823b11b | 655 | { |
9de87eea MV |
656 | scm_i_thread *t; |
657 | ||
658 | scm_i_pthread_once (&init_thread_key_once, init_thread_key); | |
659 | ||
660 | if ((t = SCM_I_CURRENT_THREAD) == NULL) | |
661 | { | |
662 | /* This thread has not been guilified yet. | |
663 | */ | |
664 | ||
665 | scm_i_pthread_mutex_lock (&scm_i_init_mutex); | |
666 | if (scm_initialized_p == 0) | |
667 | { | |
668 | /* First thread ever to enter Guile. Run the full | |
669 | initialization. | |
670 | */ | |
671 | scm_i_init_guile (base); | |
672 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
673 | } | |
674 | else | |
675 | { | |
676 | /* Guile is already initialized, but this thread enters it for | |
677 | the first time. Only initialize this thread. | |
678 | */ | |
679 | scm_i_pthread_mutex_unlock (&scm_i_init_mutex); | |
680 | guilify_self_1 (base); | |
681 | guilify_self_2 (parent); | |
682 | } | |
683 | return 1; | |
684 | } | |
685 | else if (t->top) | |
686 | { | |
687 | /* This thread is already guilified but not in guile mode, just | |
688 | resume it. | |
74926120 | 689 | |
ccf1ca4a LC |
690 | A user call to scm_with_guile() will lead us to here. This could |
691 | happen from anywhere on the stack, and in particular lower on the | |
692 | stack than when it was when this thread was first guilified. Thus, | |
693 | `base' must be updated. */ | |
694 | #if SCM_STACK_GROWS_UP | |
695 | if (base < t->base) | |
696 | t->base = base; | |
697 | #else | |
698 | if (base > t->base) | |
699 | t->base = base; | |
700 | #endif | |
701 | ||
9de87eea MV |
702 | scm_enter_guile ((scm_t_guile_ticket) t); |
703 | return 1; | |
704 | } | |
705 | else | |
706 | { | |
707 | /* Thread is already in guile mode. Nothing to do. | |
708 | */ | |
709 | return 0; | |
710 | } | |
d823b11b MV |
711 | } |
712 | ||
9de87eea | 713 | #if SCM_USE_PTHREAD_THREADS |
9de87eea | 714 | |
23d72566 KR |
715 | #if HAVE_PTHREAD_ATTR_GETSTACK && HAVE_PTHREAD_GETATTR_NP |
716 | /* This method for GNU/Linux and perhaps some other systems. | |
717 | It's not for MacOS X or Solaris 10, since pthread_getattr_np is not | |
718 | available on them. */ | |
9de87eea MV |
719 | #define HAVE_GET_THREAD_STACK_BASE |
720 | ||
721 | static SCM_STACKITEM * | |
722 | get_thread_stack_base () | |
d823b11b | 723 | { |
9de87eea MV |
724 | pthread_attr_t attr; |
725 | void *start, *end; | |
726 | size_t size; | |
727 | ||
9de87eea MV |
728 | pthread_getattr_np (pthread_self (), &attr); |
729 | pthread_attr_getstack (&attr, &start, &size); | |
730 | end = (char *)start + size; | |
731 | ||
2b829bbb KR |
732 | /* XXX - pthread_getattr_np from LinuxThreads does not seem to work |
733 | for the main thread, but we can use scm_get_stack_base in that | |
734 | case. | |
735 | */ | |
736 | ||
737 | #ifndef PTHREAD_ATTR_GETSTACK_WORKS | |
9de87eea | 738 | if ((void *)&attr < start || (void *)&attr >= end) |
071e0d93 | 739 | return (SCM_STACKITEM *) GC_stackbottom; |
9de87eea | 740 | else |
2b829bbb | 741 | #endif |
9de87eea MV |
742 | { |
743 | #if SCM_STACK_GROWS_UP | |
744 | return start; | |
745 | #else | |
746 | return end; | |
747 | #endif | |
748 | } | |
a54a94b3 MV |
749 | } |
750 | ||
23d72566 KR |
751 | #elif HAVE_PTHREAD_GET_STACKADDR_NP |
752 | /* This method for MacOS X. | |
753 | It'd be nice if there was some documentation on pthread_get_stackaddr_np, | |
754 | but as of 2006 there's nothing obvious at apple.com. */ | |
755 | #define HAVE_GET_THREAD_STACK_BASE | |
756 | static SCM_STACKITEM * | |
757 | get_thread_stack_base () | |
758 | { | |
759 | return pthread_get_stackaddr_np (pthread_self ()); | |
760 | } | |
761 | ||
762 | #elif defined (__MINGW32__) | |
763 | /* This method for mingw. In mingw the basic scm_get_stack_base can be used | |
764 | in any thread. We don't like hard-coding the name of a system, but there | |
765 | doesn't seem to be a cleaner way of knowing scm_get_stack_base can | |
766 | work. */ | |
767 | #define HAVE_GET_THREAD_STACK_BASE | |
768 | static SCM_STACKITEM * | |
769 | get_thread_stack_base () | |
770 | { | |
071e0d93 | 771 | return (SCM_STACKITEM *) GC_stackbottom; |
23d72566 KR |
772 | } |
773 | ||
774 | #endif /* pthread methods of get_thread_stack_base */ | |
9de87eea MV |
775 | |
776 | #else /* !SCM_USE_PTHREAD_THREADS */ | |
777 | ||
778 | #define HAVE_GET_THREAD_STACK_BASE | |
779 | ||
780 | static SCM_STACKITEM * | |
781 | get_thread_stack_base () | |
a54a94b3 | 782 | { |
071e0d93 | 783 | return (SCM_STACKITEM *) GC_stackbottom; |
d823b11b MV |
784 | } |
785 | ||
9de87eea | 786 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
9de87eea MV |
787 | |
788 | #ifdef HAVE_GET_THREAD_STACK_BASE | |
789 | ||
790 | void | |
791 | scm_init_guile () | |
d823b11b | 792 | { |
9de87eea MV |
793 | scm_i_init_thread_for_guile (get_thread_stack_base (), |
794 | scm_i_default_dynamic_state); | |
d823b11b MV |
795 | } |
796 | ||
9de87eea MV |
797 | #endif |
798 | ||
799 | void * | |
800 | scm_with_guile (void *(*func)(void *), void *data) | |
801 | { | |
802 | return scm_i_with_guile_and_parent (func, data, | |
803 | scm_i_default_dynamic_state); | |
804 | } | |
805 | ||
70eca635 | 806 | SCM_UNUSED static void |
2e77f720 LC |
807 | scm_leave_guile_cleanup (void *x) |
808 | { | |
809 | scm_leave_guile (); | |
47b6e9bd | 810 | on_thread_exit (SCM_I_CURRENT_THREAD); |
2e77f720 LC |
811 | } |
812 | ||
9de87eea | 813 | void * |
2e77f720 | 814 | scm_i_with_guile_and_parent (void *(*func)(void *), void *data, SCM parent) |
9de87eea MV |
815 | { |
816 | void *res; | |
817 | int really_entered; | |
818 | SCM_STACKITEM base_item; | |
2e77f720 | 819 | |
9de87eea | 820 | really_entered = scm_i_init_thread_for_guile (&base_item, parent); |
9de87eea | 821 | if (really_entered) |
2e77f720 LC |
822 | { |
823 | scm_i_pthread_cleanup_push (scm_leave_guile_cleanup, NULL); | |
824 | res = scm_c_with_continuation_barrier (func, data); | |
825 | scm_i_pthread_cleanup_pop (0); | |
826 | scm_leave_guile (); | |
827 | } | |
74926120 | 828 | else |
2e77f720 LC |
829 | res = scm_c_with_continuation_barrier (func, data); |
830 | ||
9de87eea MV |
831 | return res; |
832 | } | |
833 | ||
72e6b608 LC |
834 | \f |
835 | /*** Non-guile mode. */ | |
836 | ||
837 | #if (defined HAVE_GC_DO_BLOCKING) && (!defined HAVE_DECL_GC_DO_BLOCKING) | |
838 | ||
839 | /* This declaration is missing from the public headers of GC 7.1. */ | |
840 | extern void GC_do_blocking (void (*) (void *), void *); | |
841 | ||
842 | #endif | |
843 | ||
844 | #ifdef HAVE_GC_DO_BLOCKING | |
845 | struct without_guile_arg | |
846 | { | |
847 | void * (*function) (void *); | |
848 | void *data; | |
849 | void *result; | |
850 | }; | |
851 | ||
852 | static void | |
853 | without_guile_trampoline (void *closure) | |
854 | { | |
855 | struct without_guile_arg *arg; | |
856 | ||
857 | SCM_I_CURRENT_THREAD->guile_mode = 0; | |
858 | ||
859 | arg = (struct without_guile_arg *) closure; | |
860 | arg->result = arg->function (arg->data); | |
861 | ||
862 | SCM_I_CURRENT_THREAD->guile_mode = 1; | |
863 | } | |
864 | #endif | |
865 | ||
9de87eea MV |
866 | void * |
867 | scm_without_guile (void *(*func)(void *), void *data) | |
d823b11b | 868 | { |
72e6b608 LC |
869 | void *result; |
870 | ||
871 | #ifdef HAVE_GC_DO_BLOCKING | |
872 | if (SCM_I_CURRENT_THREAD->guile_mode) | |
873 | { | |
874 | struct without_guile_arg arg; | |
875 | ||
876 | arg.function = func; | |
877 | arg.data = data; | |
878 | GC_do_blocking (without_guile_trampoline, &arg); | |
879 | result = arg.result; | |
880 | } | |
881 | else | |
882 | #endif | |
883 | result = func (data); | |
884 | ||
885 | return result; | |
9de87eea MV |
886 | } |
887 | ||
72e6b608 | 888 | \f |
9de87eea MV |
889 | /*** Thread creation */ |
890 | ||
891 | typedef struct { | |
892 | SCM parent; | |
893 | SCM thunk; | |
894 | SCM handler; | |
76da80e7 | 895 | SCM thread; |
9de87eea MV |
896 | scm_i_pthread_mutex_t mutex; |
897 | scm_i_pthread_cond_t cond; | |
898 | } launch_data; | |
d823b11b | 899 | |
9de87eea MV |
900 | static void * |
901 | really_launch (void *d) | |
902 | { | |
903 | launch_data *data = (launch_data *)d; | |
904 | SCM thunk = data->thunk, handler = data->handler; | |
905 | scm_i_thread *t; | |
d823b11b | 906 | |
9de87eea | 907 | t = SCM_I_CURRENT_THREAD; |
a54a94b3 | 908 | |
9de87eea MV |
909 | scm_i_scm_pthread_mutex_lock (&data->mutex); |
910 | data->thread = scm_current_thread (); | |
911 | scm_i_pthread_cond_signal (&data->cond); | |
912 | scm_i_pthread_mutex_unlock (&data->mutex); | |
913 | ||
914 | if (SCM_UNBNDP (handler)) | |
915 | t->result = scm_call_0 (thunk); | |
916 | else | |
917 | t->result = scm_catch (SCM_BOOL_T, thunk, handler); | |
918 | ||
47b6e9bd LC |
919 | /* Trigger a call to `on_thread_exit ()'. */ |
920 | pthread_exit (NULL); | |
921 | ||
9de87eea | 922 | return 0; |
d823b11b MV |
923 | } |
924 | ||
9de87eea MV |
925 | static void * |
926 | launch_thread (void *d) | |
927 | { | |
928 | launch_data *data = (launch_data *)d; | |
929 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
930 | scm_i_with_guile_and_parent (really_launch, d, data->parent); | |
931 | return NULL; | |
932 | } | |
933 | ||
934 | SCM_DEFINE (scm_call_with_new_thread, "call-with-new-thread", 1, 1, 0, | |
d823b11b | 935 | (SCM thunk, SCM handler), |
9de87eea MV |
936 | "Call @code{thunk} in a new thread and with a new dynamic state,\n" |
937 | "returning a new thread object representing the thread. The procedure\n" | |
938 | "@var{thunk} is called via @code{with-continuation-barrier}.\n" | |
939 | "\n" | |
940 | "When @var{handler} is specified, then @var{thunk} is called from\n" | |
941 | "within a @code{catch} with tag @code{#t} that has @var{handler} as its\n" | |
942 | "handler. This catch is established inside the continuation barrier.\n" | |
943 | "\n" | |
944 | "Once @var{thunk} or @var{handler} returns, the return value is made\n" | |
945 | "the @emph{exit value} of the thread and the thread is terminated.") | |
d823b11b MV |
946 | #define FUNC_NAME s_scm_call_with_new_thread |
947 | { | |
9de87eea MV |
948 | launch_data data; |
949 | scm_i_pthread_t id; | |
950 | int err; | |
d823b11b | 951 | |
9de87eea MV |
952 | SCM_ASSERT (scm_is_true (scm_thunk_p (thunk)), thunk, SCM_ARG1, FUNC_NAME); |
953 | SCM_ASSERT (SCM_UNBNDP (handler) || scm_is_true (scm_procedure_p (handler)), | |
954 | handler, SCM_ARG2, FUNC_NAME); | |
955 | ||
956 | data.parent = scm_current_dynamic_state (); | |
957 | data.thunk = thunk; | |
958 | data.handler = handler; | |
959 | data.thread = SCM_BOOL_F; | |
960 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
961 | scm_i_pthread_cond_init (&data.cond, NULL); | |
962 | ||
963 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
964 | err = scm_i_pthread_create (&id, NULL, launch_thread, &data); | |
965 | if (err) | |
966 | { | |
967 | scm_i_pthread_mutex_unlock (&data.mutex); | |
968 | errno = err; | |
969 | scm_syserror (NULL); | |
970 | } | |
971 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
972 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 973 | |
9de87eea | 974 | return data.thread; |
d823b11b MV |
975 | } |
976 | #undef FUNC_NAME | |
977 | ||
9de87eea MV |
978 | typedef struct { |
979 | SCM parent; | |
980 | scm_t_catch_body body; | |
981 | void *body_data; | |
982 | scm_t_catch_handler handler; | |
983 | void *handler_data; | |
984 | SCM thread; | |
985 | scm_i_pthread_mutex_t mutex; | |
986 | scm_i_pthread_cond_t cond; | |
987 | } spawn_data; | |
988 | ||
989 | static void * | |
990 | really_spawn (void *d) | |
991 | { | |
992 | spawn_data *data = (spawn_data *)d; | |
993 | scm_t_catch_body body = data->body; | |
994 | void *body_data = data->body_data; | |
995 | scm_t_catch_handler handler = data->handler; | |
996 | void *handler_data = data->handler_data; | |
997 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
998 | ||
999 | scm_i_scm_pthread_mutex_lock (&data->mutex); | |
1000 | data->thread = scm_current_thread (); | |
1001 | scm_i_pthread_cond_signal (&data->cond); | |
1002 | scm_i_pthread_mutex_unlock (&data->mutex); | |
1003 | ||
1004 | if (handler == NULL) | |
1005 | t->result = body (body_data); | |
1006 | else | |
1007 | t->result = scm_internal_catch (SCM_BOOL_T, | |
1008 | body, body_data, | |
1009 | handler, handler_data); | |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | static void * | |
1015 | spawn_thread (void *d) | |
1016 | { | |
1017 | spawn_data *data = (spawn_data *)d; | |
1018 | scm_i_pthread_detach (scm_i_pthread_self ()); | |
1019 | scm_i_with_guile_and_parent (really_spawn, d, data->parent); | |
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | SCM | |
1024 | scm_spawn_thread (scm_t_catch_body body, void *body_data, | |
1025 | scm_t_catch_handler handler, void *handler_data) | |
1026 | { | |
1027 | spawn_data data; | |
1028 | scm_i_pthread_t id; | |
1029 | int err; | |
1030 | ||
1031 | data.parent = scm_current_dynamic_state (); | |
1032 | data.body = body; | |
1033 | data.body_data = body_data; | |
1034 | data.handler = handler; | |
1035 | data.handler_data = handler_data; | |
1036 | data.thread = SCM_BOOL_F; | |
1037 | scm_i_pthread_mutex_init (&data.mutex, NULL); | |
1038 | scm_i_pthread_cond_init (&data.cond, NULL); | |
1039 | ||
1040 | scm_i_scm_pthread_mutex_lock (&data.mutex); | |
1041 | err = scm_i_pthread_create (&id, NULL, spawn_thread, &data); | |
1042 | if (err) | |
1043 | { | |
1044 | scm_i_pthread_mutex_unlock (&data.mutex); | |
1045 | errno = err; | |
1046 | scm_syserror (NULL); | |
1047 | } | |
1048 | scm_i_scm_pthread_cond_wait (&data.cond, &data.mutex); | |
1049 | scm_i_pthread_mutex_unlock (&data.mutex); | |
74926120 | 1050 | |
9de87eea MV |
1051 | return data.thread; |
1052 | } | |
1053 | ||
29717c89 MD |
1054 | SCM_DEFINE (scm_yield, "yield", 0, 0, 0, |
1055 | (), | |
1056 | "Move the calling thread to the end of the scheduling queue.") | |
1057 | #define FUNC_NAME s_scm_yield | |
1058 | { | |
9de87eea | 1059 | return scm_from_bool (scm_i_sched_yield ()); |
29717c89 MD |
1060 | } |
1061 | #undef FUNC_NAME | |
1062 | ||
2e77f720 LC |
1063 | SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0, |
1064 | (SCM thread), | |
1065 | "Asynchronously force the target @var{thread} to terminate. @var{thread} " | |
1066 | "cannot be the current thread, and if @var{thread} has already terminated or " | |
1067 | "been signaled to terminate, this function is a no-op.") | |
1068 | #define FUNC_NAME s_scm_cancel_thread | |
1069 | { | |
1070 | scm_i_thread *t = NULL; | |
1071 | ||
1072 | SCM_VALIDATE_THREAD (1, thread); | |
1073 | t = SCM_I_THREAD_DATA (thread); | |
86a597f8 | 1074 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 LC |
1075 | if (!t->canceled) |
1076 | { | |
1077 | t->canceled = 1; | |
86a597f8 | 1078 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1079 | scm_i_pthread_cancel (t->pthread); |
1080 | } | |
1081 | else | |
86a597f8 | 1082 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1083 | |
1084 | return SCM_UNSPECIFIED; | |
1085 | } | |
1086 | #undef FUNC_NAME | |
1087 | ||
1088 | SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0, | |
1089 | (SCM thread, SCM proc), | |
1090 | "Set the thunk @var{proc} as the cleanup handler for the thread @var{thread}. " | |
1091 | "This handler will be called when the thread exits.") | |
1092 | #define FUNC_NAME s_scm_set_thread_cleanup_x | |
1093 | { | |
1094 | scm_i_thread *t; | |
1095 | ||
1096 | SCM_VALIDATE_THREAD (1, thread); | |
1097 | if (!scm_is_false (proc)) | |
1098 | SCM_VALIDATE_THUNK (2, proc); | |
1099 | ||
2e77f720 | 1100 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1101 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1102 | ||
2e77f720 LC |
1103 | if (!(t->exited || t->canceled)) |
1104 | t->cleanup_handler = proc; | |
1105 | ||
86a597f8 | 1106 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1107 | |
1108 | return SCM_UNSPECIFIED; | |
1109 | } | |
1110 | #undef FUNC_NAME | |
1111 | ||
1112 | SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0, | |
1113 | (SCM thread), | |
1114 | "Return the cleanup handler installed for the thread @var{thread}.") | |
1115 | #define FUNC_NAME s_scm_thread_cleanup | |
1116 | { | |
1117 | scm_i_thread *t; | |
1118 | SCM ret; | |
1119 | ||
1120 | SCM_VALIDATE_THREAD (1, thread); | |
1121 | ||
2e77f720 | 1122 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 | 1123 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
2e77f720 | 1124 | ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler; |
86a597f8 | 1125 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 LC |
1126 | |
1127 | return ret; | |
1128 | } | |
1129 | #undef FUNC_NAME | |
1130 | ||
6180e336 NJ |
1131 | SCM scm_join_thread (SCM thread) |
1132 | { | |
1133 | return scm_join_thread_timed (thread, SCM_UNDEFINED, SCM_UNDEFINED); | |
1134 | } | |
1135 | ||
1136 | SCM_DEFINE (scm_join_thread_timed, "join-thread", 1, 2, 0, | |
1137 | (SCM thread, SCM timeout, SCM timeoutval), | |
d823b11b MV |
1138 | "Suspend execution of the calling thread until the target @var{thread} " |
1139 | "terminates, unless the target @var{thread} has already terminated. ") | |
6180e336 | 1140 | #define FUNC_NAME s_scm_join_thread_timed |
5f05c406 | 1141 | { |
9de87eea | 1142 | scm_i_thread *t; |
6180e336 NJ |
1143 | scm_t_timespec ctimeout, *timeout_ptr = NULL; |
1144 | SCM res = SCM_BOOL_F; | |
1145 | ||
1146 | if (! (SCM_UNBNDP (timeoutval))) | |
1147 | res = timeoutval; | |
d823b11b MV |
1148 | |
1149 | SCM_VALIDATE_THREAD (1, thread); | |
9de87eea | 1150 | if (scm_is_eq (scm_current_thread (), thread)) |
2e77f720 | 1151 | SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL); |
d823b11b | 1152 | |
9de87eea | 1153 | t = SCM_I_THREAD_DATA (thread); |
86a597f8 NJ |
1154 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
1155 | ||
6180e336 NJ |
1156 | if (! SCM_UNBNDP (timeout)) |
1157 | { | |
1158 | to_timespec (timeout, &ctimeout); | |
1159 | timeout_ptr = &ctimeout; | |
1160 | } | |
1161 | ||
1162 | if (t->exited) | |
1163 | res = t->result; | |
1164 | else | |
d823b11b | 1165 | { |
9de87eea MV |
1166 | while (1) |
1167 | { | |
74926120 | 1168 | int err = block_self (t->join_queue, thread, &t->admin_mutex, |
6180e336 NJ |
1169 | timeout_ptr); |
1170 | if (err == 0) | |
1171 | { | |
1172 | if (t->exited) | |
1173 | { | |
1174 | res = t->result; | |
1175 | break; | |
1176 | } | |
1177 | } | |
1178 | else if (err == ETIMEDOUT) | |
9de87eea | 1179 | break; |
6180e336 | 1180 | |
86a597f8 | 1181 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
9de87eea | 1182 | SCM_TICK; |
86a597f8 | 1183 | scm_i_scm_pthread_mutex_lock (&t->admin_mutex); |
21346c4f NJ |
1184 | |
1185 | /* Check for exit again, since we just released and | |
1186 | reacquired the admin mutex, before the next block_self | |
1187 | call (which would block forever if t has already | |
1188 | exited). */ | |
1189 | if (t->exited) | |
1190 | { | |
1191 | res = t->result; | |
1192 | break; | |
1193 | } | |
9de87eea | 1194 | } |
d823b11b | 1195 | } |
9de87eea | 1196 | |
86a597f8 | 1197 | scm_i_pthread_mutex_unlock (&t->admin_mutex); |
2e77f720 | 1198 | |
d823b11b | 1199 | return res; |
5f05c406 MV |
1200 | } |
1201 | #undef FUNC_NAME | |
1202 | ||
6180e336 NJ |
1203 | SCM_DEFINE (scm_thread_p, "thread?", 1, 0, 0, |
1204 | (SCM obj), | |
1205 | "Return @code{#t} if @var{obj} is a thread.") | |
1206 | #define FUNC_NAME s_scm_thread_p | |
1207 | { | |
1208 | return SCM_I_IS_THREAD(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1209 | } | |
1210 | #undef FUNC_NAME | |
5f05c406 | 1211 | |
4079f87e | 1212 | |
9de87eea MV |
1213 | static size_t |
1214 | fat_mutex_free (SCM mx) | |
76da80e7 | 1215 | { |
9de87eea MV |
1216 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1217 | scm_i_pthread_mutex_destroy (&m->lock); | |
1218 | scm_gc_free (m, sizeof (fat_mutex), "mutex"); | |
76da80e7 MV |
1219 | return 0; |
1220 | } | |
1221 | ||
1222 | static int | |
9de87eea | 1223 | fat_mutex_print (SCM mx, SCM port, scm_print_state *pstate SCM_UNUSED) |
76da80e7 | 1224 | { |
9de87eea MV |
1225 | fat_mutex *m = SCM_MUTEX_DATA (mx); |
1226 | scm_puts ("#<mutex ", port); | |
1227 | scm_uintprint ((scm_t_bits)m, 16, port); | |
1228 | scm_puts (">", port); | |
1229 | return 1; | |
76da80e7 MV |
1230 | } |
1231 | ||
76da80e7 | 1232 | static SCM |
6180e336 | 1233 | make_fat_mutex (int recursive, int unchecked_unlock, int external_unlock) |
76da80e7 | 1234 | { |
9de87eea MV |
1235 | fat_mutex *m; |
1236 | SCM mx; | |
1237 | ||
1238 | m = scm_gc_malloc (sizeof (fat_mutex), "mutex"); | |
1239 | scm_i_pthread_mutex_init (&m->lock, NULL); | |
1240 | m->owner = SCM_BOOL_F; | |
adc085f1 | 1241 | m->level = 0; |
6180e336 | 1242 | |
adc085f1 | 1243 | m->recursive = recursive; |
6180e336 NJ |
1244 | m->unchecked_unlock = unchecked_unlock; |
1245 | m->allow_external_unlock = external_unlock; | |
1246 | ||
9de87eea MV |
1247 | m->waiting = SCM_EOL; |
1248 | SCM_NEWSMOB (mx, scm_tc16_mutex, (scm_t_bits) m); | |
1249 | m->waiting = make_queue (); | |
1250 | return mx; | |
76da80e7 MV |
1251 | } |
1252 | ||
6180e336 NJ |
1253 | SCM scm_make_mutex (void) |
1254 | { | |
1255 | return scm_make_mutex_with_flags (SCM_EOL); | |
1256 | } | |
1257 | ||
2a1d0688 NJ |
1258 | SCM_SYMBOL (unchecked_unlock_sym, "unchecked-unlock"); |
1259 | SCM_SYMBOL (allow_external_unlock_sym, "allow-external-unlock"); | |
1260 | SCM_SYMBOL (recursive_sym, "recursive"); | |
6180e336 NJ |
1261 | |
1262 | SCM_DEFINE (scm_make_mutex_with_flags, "make-mutex", 0, 0, 1, | |
1263 | (SCM flags), | |
9de87eea | 1264 | "Create a new mutex. ") |
6180e336 | 1265 | #define FUNC_NAME s_scm_make_mutex_with_flags |
76da80e7 | 1266 | { |
6180e336 NJ |
1267 | int unchecked_unlock = 0, external_unlock = 0, recursive = 0; |
1268 | ||
1269 | SCM ptr = flags; | |
1270 | while (! scm_is_null (ptr)) | |
1271 | { | |
1272 | SCM flag = SCM_CAR (ptr); | |
1273 | if (scm_is_eq (flag, unchecked_unlock_sym)) | |
1274 | unchecked_unlock = 1; | |
1275 | else if (scm_is_eq (flag, allow_external_unlock_sym)) | |
1276 | external_unlock = 1; | |
1277 | else if (scm_is_eq (flag, recursive_sym)) | |
1278 | recursive = 1; | |
74926120 | 1279 | else |
2a1d0688 | 1280 | SCM_MISC_ERROR ("unsupported mutex option: ~a", scm_list_1 (flag)); |
6180e336 NJ |
1281 | ptr = SCM_CDR (ptr); |
1282 | } | |
1283 | return make_fat_mutex (recursive, unchecked_unlock, external_unlock); | |
76da80e7 MV |
1284 | } |
1285 | #undef FUNC_NAME | |
1286 | ||
9de87eea | 1287 | SCM_DEFINE (scm_make_recursive_mutex, "make-recursive-mutex", 0, 0, 0, |
9bc4701c | 1288 | (void), |
9de87eea MV |
1289 | "Create a new recursive mutex. ") |
1290 | #define FUNC_NAME s_scm_make_recursive_mutex | |
9bc4701c | 1291 | { |
6180e336 | 1292 | return make_fat_mutex (1, 0, 0); |
9bc4701c MD |
1293 | } |
1294 | #undef FUNC_NAME | |
1295 | ||
6180e336 NJ |
1296 | SCM_SYMBOL (scm_abandoned_mutex_error_key, "abandoned-mutex-error"); |
1297 | ||
1298 | static SCM | |
adc085f1 | 1299 | fat_mutex_lock (SCM mutex, scm_t_timespec *timeout, SCM owner, int *ret) |
9de87eea MV |
1300 | { |
1301 | fat_mutex *m = SCM_MUTEX_DATA (mutex); | |
6180e336 | 1302 | |
adc085f1 | 1303 | SCM new_owner = SCM_UNBNDP (owner) ? scm_current_thread() : owner; |
6180e336 NJ |
1304 | SCM err = SCM_BOOL_F; |
1305 | ||
1306 | struct timeval current_time; | |
9de87eea MV |
1307 | |
1308 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1309 | |
1310 | while (1) | |
9de87eea | 1311 | { |
adc085f1 | 1312 | if (m->level == 0) |
6180e336 | 1313 | { |
adc085f1 | 1314 | m->owner = new_owner; |
6180e336 | 1315 | m->level++; |
74926120 | 1316 | |
adc085f1 | 1317 | if (SCM_I_IS_THREAD (new_owner)) |
6180e336 | 1318 | { |
adc085f1 | 1319 | scm_i_thread *t = SCM_I_THREAD_DATA (new_owner); |
6180e336 NJ |
1320 | scm_i_pthread_mutex_lock (&t->admin_mutex); |
1321 | t->mutexes = scm_cons (mutex, t->mutexes); | |
1322 | scm_i_pthread_mutex_unlock (&t->admin_mutex); | |
6180e336 | 1323 | } |
adc085f1 JG |
1324 | *ret = 1; |
1325 | break; | |
1326 | } | |
1327 | else if (SCM_I_IS_THREAD (m->owner) && scm_c_thread_exited_p (m->owner)) | |
1328 | { | |
1329 | m->owner = new_owner; | |
1330 | err = scm_cons (scm_abandoned_mutex_error_key, | |
1331 | scm_from_locale_string ("lock obtained on abandoned " | |
1332 | "mutex")); | |
1333 | *ret = 1; | |
1334 | break; | |
1335 | } | |
1336 | else if (scm_is_eq (m->owner, new_owner)) | |
1337 | { | |
1338 | if (m->recursive) | |
1339 | { | |
1340 | m->level++; | |
74926120 | 1341 | *ret = 1; |
adc085f1 JG |
1342 | } |
1343 | else | |
6180e336 | 1344 | { |
adc085f1 JG |
1345 | err = scm_cons (scm_misc_error_key, |
1346 | scm_from_locale_string ("mutex already locked " | |
1347 | "by thread")); | |
1348 | *ret = 0; | |
1349 | } | |
74926120 | 1350 | break; |
adc085f1 | 1351 | } |
9de87eea | 1352 | else |
9de87eea | 1353 | { |
74926120 | 1354 | if (timeout != NULL) |
adc085f1 JG |
1355 | { |
1356 | gettimeofday (¤t_time, NULL); | |
1357 | if (current_time.tv_sec > timeout->tv_sec || | |
1358 | (current_time.tv_sec == timeout->tv_sec && | |
1359 | current_time.tv_usec * 1000 > timeout->tv_nsec)) | |
6180e336 | 1360 | { |
adc085f1 JG |
1361 | *ret = 0; |
1362 | break; | |
6180e336 | 1363 | } |
6180e336 | 1364 | } |
37a52039 | 1365 | block_self (m->waiting, mutex, &m->lock, timeout); |
9de87eea MV |
1366 | scm_i_pthread_mutex_unlock (&m->lock); |
1367 | SCM_TICK; | |
1368 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1369 | } | |
1370 | } | |
1371 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 | 1372 | return err; |
9de87eea MV |
1373 | } |
1374 | ||
6180e336 NJ |
1375 | SCM scm_lock_mutex (SCM mx) |
1376 | { | |
adc085f1 | 1377 | return scm_lock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); |
6180e336 NJ |
1378 | } |
1379 | ||
adc085f1 JG |
1380 | SCM_DEFINE (scm_lock_mutex_timed, "lock-mutex", 1, 2, 0, |
1381 | (SCM m, SCM timeout, SCM owner), | |
9bc4701c MD |
1382 | "Lock @var{mutex}. If the mutex is already locked, the calling thread " |
1383 | "blocks until the mutex becomes available. The function returns when " | |
1384 | "the calling thread owns the lock on @var{mutex}. Locking a mutex that " | |
1385 | "a thread already owns will succeed right away and will not block the " | |
1386 | "thread. That is, Guile's mutexes are @emph{recursive}. ") | |
6180e336 | 1387 | #define FUNC_NAME s_scm_lock_mutex_timed |
9bc4701c | 1388 | { |
6180e336 NJ |
1389 | SCM exception; |
1390 | int ret = 0; | |
1391 | scm_t_timespec cwaittime, *waittime = NULL; | |
76da80e7 | 1392 | |
6180e336 NJ |
1393 | SCM_VALIDATE_MUTEX (1, m); |
1394 | ||
1395 | if (! SCM_UNBNDP (timeout) && ! scm_is_false (timeout)) | |
1396 | { | |
1397 | to_timespec (timeout, &cwaittime); | |
1398 | waittime = &cwaittime; | |
1399 | } | |
1400 | ||
adc085f1 | 1401 | exception = fat_mutex_lock (m, waittime, owner, &ret); |
6180e336 NJ |
1402 | if (!scm_is_false (exception)) |
1403 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1404 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c | 1405 | } |
76da80e7 | 1406 | #undef FUNC_NAME |
9bc4701c | 1407 | |
a4d106c7 | 1408 | void |
661ae7ab | 1409 | scm_dynwind_lock_mutex (SCM mutex) |
a4d106c7 | 1410 | { |
661ae7ab MV |
1411 | scm_dynwind_unwind_handler_with_scm ((void(*)(SCM))scm_unlock_mutex, mutex, |
1412 | SCM_F_WIND_EXPLICITLY); | |
1413 | scm_dynwind_rewind_handler_with_scm ((void(*)(SCM))scm_lock_mutex, mutex, | |
1414 | SCM_F_WIND_EXPLICITLY); | |
a4d106c7 MV |
1415 | } |
1416 | ||
9bc4701c | 1417 | SCM_DEFINE (scm_try_mutex, "try-mutex", 1, 0, 0, |
ba1b7223 | 1418 | (SCM mutex), |
9bc4701c MD |
1419 | "Try to lock @var{mutex}. If the mutex is already locked by someone " |
1420 | "else, return @code{#f}. Else lock the mutex and return @code{#t}. ") | |
1421 | #define FUNC_NAME s_scm_try_mutex | |
1422 | { | |
6180e336 NJ |
1423 | SCM exception; |
1424 | int ret = 0; | |
1425 | scm_t_timespec cwaittime, *waittime = NULL; | |
9de87eea | 1426 | |
ba1b7223 | 1427 | SCM_VALIDATE_MUTEX (1, mutex); |
6180e336 NJ |
1428 | |
1429 | to_timespec (scm_from_int(0), &cwaittime); | |
1430 | waittime = &cwaittime; | |
74926120 | 1431 | |
adc085f1 | 1432 | exception = fat_mutex_lock (mutex, waittime, SCM_UNDEFINED, &ret); |
6180e336 NJ |
1433 | if (!scm_is_false (exception)) |
1434 | scm_ithrow (SCM_CAR (exception), scm_list_1 (SCM_CDR (exception)), 1); | |
1435 | return ret ? SCM_BOOL_T : SCM_BOOL_F; | |
9de87eea MV |
1436 | } |
1437 | #undef FUNC_NAME | |
76da80e7 | 1438 | |
6180e336 NJ |
1439 | /*** Fat condition variables */ |
1440 | ||
1441 | typedef struct { | |
1442 | scm_i_pthread_mutex_t lock; | |
1443 | SCM waiting; /* the threads waiting for this condition. */ | |
1444 | } fat_cond; | |
1445 | ||
1446 | #define SCM_CONDVARP(x) SCM_SMOB_PREDICATE (scm_tc16_condvar, x) | |
1447 | #define SCM_CONDVAR_DATA(x) ((fat_cond *) SCM_SMOB_DATA (x)) | |
1448 | ||
1449 | static int | |
1450 | fat_mutex_unlock (SCM mutex, SCM cond, | |
1451 | const scm_t_timespec *waittime, int relock) | |
9de87eea | 1452 | { |
6180e336 NJ |
1453 | fat_mutex *m = SCM_MUTEX_DATA (mutex); |
1454 | fat_cond *c = NULL; | |
1455 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
1456 | int err = 0, ret = 0; | |
9de87eea MV |
1457 | |
1458 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
adc085f1 JG |
1459 | |
1460 | SCM owner = m->owner; | |
1461 | ||
1462 | if (!scm_is_eq (owner, scm_current_thread ())) | |
9bc4701c | 1463 | { |
adc085f1 | 1464 | if (m->level == 0) |
6180e336 NJ |
1465 | { |
1466 | if (!m->unchecked_unlock) | |
2a1d0688 NJ |
1467 | { |
1468 | scm_i_pthread_mutex_unlock (&m->lock); | |
1469 | scm_misc_error (NULL, "mutex not locked", SCM_EOL); | |
1470 | } | |
adc085f1 | 1471 | owner = scm_current_thread (); |
6180e336 NJ |
1472 | } |
1473 | else if (!m->allow_external_unlock) | |
2a1d0688 NJ |
1474 | { |
1475 | scm_i_pthread_mutex_unlock (&m->lock); | |
1476 | scm_misc_error (NULL, "mutex not locked by current thread", SCM_EOL); | |
1477 | } | |
6180e336 NJ |
1478 | } |
1479 | ||
1480 | if (! (SCM_UNBNDP (cond))) | |
1481 | { | |
6180e336 NJ |
1482 | c = SCM_CONDVAR_DATA (cond); |
1483 | while (1) | |
1484 | { | |
1485 | int brk = 0; | |
1486 | ||
6180e336 NJ |
1487 | if (m->level > 0) |
1488 | m->level--; | |
adc085f1 | 1489 | if (m->level == 0) |
6180e336 | 1490 | m->owner = unblock_from_queue (m->waiting); |
adc085f1 | 1491 | |
6180e336 | 1492 | t->block_asyncs++; |
74926120 | 1493 | |
d2a51087 NJ |
1494 | err = block_self (c->waiting, cond, &m->lock, waittime); |
1495 | scm_i_pthread_mutex_unlock (&m->lock); | |
6180e336 NJ |
1496 | |
1497 | if (err == 0) | |
1498 | { | |
1499 | ret = 1; | |
1500 | brk = 1; | |
1501 | } | |
1502 | else if (err == ETIMEDOUT) | |
1503 | { | |
1504 | ret = 0; | |
1505 | brk = 1; | |
1506 | } | |
1507 | else if (err != EINTR) | |
74926120 | 1508 | { |
6180e336 | 1509 | errno = err; |
6180e336 | 1510 | scm_syserror (NULL); |
74926120 | 1511 | } |
6180e336 NJ |
1512 | |
1513 | if (brk) | |
1514 | { | |
1515 | if (relock) | |
adc085f1 | 1516 | scm_lock_mutex_timed (mutex, SCM_UNDEFINED, owner); |
4201062d | 1517 | t->block_asyncs--; |
6180e336 NJ |
1518 | break; |
1519 | } | |
74926120 | 1520 | |
6180e336 NJ |
1521 | t->block_asyncs--; |
1522 | scm_async_click (); | |
74926120 | 1523 | |
6180e336 NJ |
1524 | scm_remember_upto_here_2 (cond, mutex); |
1525 | ||
1526 | scm_i_scm_pthread_mutex_lock (&m->lock); | |
1527 | } | |
9bc4701c | 1528 | } |
9de87eea | 1529 | else |
6180e336 NJ |
1530 | { |
1531 | if (m->level > 0) | |
1532 | m->level--; | |
74926120 | 1533 | if (m->level == 0) |
6180e336 | 1534 | m->owner = unblock_from_queue (m->waiting); |
74926120 | 1535 | |
6180e336 NJ |
1536 | scm_i_pthread_mutex_unlock (&m->lock); |
1537 | ret = 1; | |
1538 | } | |
9de87eea | 1539 | |
6180e336 | 1540 | return ret; |
9bc4701c | 1541 | } |
9bc4701c | 1542 | |
6180e336 NJ |
1543 | SCM scm_unlock_mutex (SCM mx) |
1544 | { | |
1545 | return scm_unlock_mutex_timed (mx, SCM_UNDEFINED, SCM_UNDEFINED); | |
9bc4701c | 1546 | } |
9bc4701c | 1547 | |
6180e336 NJ |
1548 | SCM_DEFINE (scm_unlock_mutex_timed, "unlock-mutex", 1, 2, 0, |
1549 | (SCM mx, SCM cond, SCM timeout), | |
9bc4701c MD |
1550 | "Unlocks @var{mutex} if the calling thread owns the lock on " |
1551 | "@var{mutex}. Calling unlock-mutex on a mutex not owned by the current " | |
1552 | "thread results in undefined behaviour. Once a mutex has been unlocked, " | |
1553 | "one thread blocked on @var{mutex} is awakened and grabs the mutex " | |
1554 | "lock. Every call to @code{lock-mutex} by this thread must be matched " | |
1555 | "with a call to @code{unlock-mutex}. Only the last call to " | |
1556 | "@code{unlock-mutex} will actually unlock the mutex. ") | |
6180e336 | 1557 | #define FUNC_NAME s_scm_unlock_mutex_timed |
9bc4701c | 1558 | { |
6180e336 NJ |
1559 | scm_t_timespec cwaittime, *waittime = NULL; |
1560 | ||
9bc4701c | 1561 | SCM_VALIDATE_MUTEX (1, mx); |
6180e336 NJ |
1562 | if (! (SCM_UNBNDP (cond))) |
1563 | { | |
1564 | SCM_VALIDATE_CONDVAR (2, cond); | |
1565 | ||
1566 | if (! (SCM_UNBNDP (timeout))) | |
1567 | { | |
1568 | to_timespec (timeout, &cwaittime); | |
1569 | waittime = &cwaittime; | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | return fat_mutex_unlock (mx, cond, waittime, 0) ? SCM_BOOL_T : SCM_BOOL_F; | |
9bc4701c MD |
1574 | } |
1575 | #undef FUNC_NAME | |
1576 | ||
6180e336 NJ |
1577 | SCM_DEFINE (scm_mutex_p, "mutex?", 1, 0, 0, |
1578 | (SCM obj), | |
1579 | "Return @code{#t} if @var{obj} is a mutex.") | |
1580 | #define FUNC_NAME s_scm_mutex_p | |
1581 | { | |
1582 | return SCM_MUTEXP (obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1583 | } | |
74926120 | 1584 | #undef FUNC_NAME |
9de87eea MV |
1585 | |
1586 | SCM_DEFINE (scm_mutex_owner, "mutex-owner", 1, 0, 0, | |
1587 | (SCM mx), | |
1588 | "Return the thread owning @var{mx}, or @code{#f}.") | |
1589 | #define FUNC_NAME s_scm_mutex_owner | |
1590 | { | |
adc085f1 JG |
1591 | SCM owner; |
1592 | fat_mutex *m = NULL; | |
1593 | ||
9de87eea | 1594 | SCM_VALIDATE_MUTEX (1, mx); |
adc085f1 JG |
1595 | m = SCM_MUTEX_DATA (mx); |
1596 | scm_i_pthread_mutex_lock (&m->lock); | |
1597 | owner = m->owner; | |
1598 | scm_i_pthread_mutex_unlock (&m->lock); | |
1599 | ||
1600 | return owner; | |
9de87eea MV |
1601 | } |
1602 | #undef FUNC_NAME | |
1603 | ||
1604 | SCM_DEFINE (scm_mutex_level, "mutex-level", 1, 0, 0, | |
1605 | (SCM mx), | |
adc085f1 | 1606 | "Return the lock level of mutex @var{mx}.") |
9de87eea MV |
1607 | #define FUNC_NAME s_scm_mutex_level |
1608 | { | |
1609 | SCM_VALIDATE_MUTEX (1, mx); | |
1610 | return scm_from_int (SCM_MUTEX_DATA(mx)->level); | |
1611 | } | |
1612 | #undef FUNC_NAME | |
1613 | ||
adc085f1 JG |
1614 | SCM_DEFINE (scm_mutex_locked_p, "mutex-locked?", 1, 0, 0, |
1615 | (SCM mx), | |
1616 | "Returns @code{#t} if the mutex @var{mx} is locked.") | |
1617 | #define FUNC_NAME s_scm_mutex_locked_p | |
1618 | { | |
1619 | SCM_VALIDATE_MUTEX (1, mx); | |
1620 | return SCM_MUTEX_DATA (mx)->level > 0 ? SCM_BOOL_T : SCM_BOOL_F; | |
1621 | } | |
1622 | #undef FUNC_NAME | |
9de87eea | 1623 | |
9de87eea MV |
1624 | static size_t |
1625 | fat_cond_free (SCM mx) | |
1626 | { | |
1627 | fat_cond *c = SCM_CONDVAR_DATA (mx); | |
9de87eea MV |
1628 | scm_gc_free (c, sizeof (fat_cond), "condition-variable"); |
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | static int | |
1633 | fat_cond_print (SCM cv, SCM port, scm_print_state *pstate SCM_UNUSED) | |
1634 | { | |
1635 | fat_cond *c = SCM_CONDVAR_DATA (cv); | |
1636 | scm_puts ("#<condition-variable ", port); | |
1637 | scm_uintprint ((scm_t_bits)c, 16, port); | |
1638 | scm_puts (">", port); | |
1639 | return 1; | |
1640 | } | |
9bc4701c | 1641 | |
d823b11b MV |
1642 | SCM_DEFINE (scm_make_condition_variable, "make-condition-variable", 0, 0, 0, |
1643 | (void), | |
1644 | "Make a new condition variable.") | |
1645 | #define FUNC_NAME s_scm_make_condition_variable | |
5f05c406 | 1646 | { |
9de87eea MV |
1647 | fat_cond *c; |
1648 | SCM cv; | |
1649 | ||
1650 | c = scm_gc_malloc (sizeof (fat_cond), "condition variable"); | |
9de87eea MV |
1651 | c->waiting = SCM_EOL; |
1652 | SCM_NEWSMOB (cv, scm_tc16_condvar, (scm_t_bits) c); | |
1653 | c->waiting = make_queue (); | |
d823b11b | 1654 | return cv; |
5f05c406 | 1655 | } |
d823b11b | 1656 | #undef FUNC_NAME |
5f05c406 | 1657 | |
d823b11b MV |
1658 | SCM_DEFINE (scm_timed_wait_condition_variable, "wait-condition-variable", 2, 1, 0, |
1659 | (SCM cv, SCM mx, SCM t), | |
1660 | "Wait until @var{cond-var} has been signalled. While waiting, " | |
1661 | "@var{mutex} is atomically unlocked (as with @code{unlock-mutex}) and " | |
1662 | "is locked again when this function returns. When @var{time} is given, " | |
1663 | "it specifies a point in time where the waiting should be aborted. It " | |
1664 | "can be either a integer as returned by @code{current-time} or a pair " | |
1665 | "as returned by @code{gettimeofday}. When the waiting is aborted the " | |
1666 | "mutex is locked and @code{#f} is returned. When the condition " | |
1667 | "variable is in fact signalled, the mutex is also locked and @code{#t} " | |
1668 | "is returned. ") | |
1669 | #define FUNC_NAME s_scm_timed_wait_condition_variable | |
5f05c406 | 1670 | { |
9de87eea | 1671 | scm_t_timespec waittime, *waitptr = NULL; |
d823b11b MV |
1672 | |
1673 | SCM_VALIDATE_CONDVAR (1, cv); | |
1674 | SCM_VALIDATE_MUTEX (2, mx); | |
74926120 | 1675 | |
d823b11b MV |
1676 | if (!SCM_UNBNDP (t)) |
1677 | { | |
6180e336 | 1678 | to_timespec (t, &waittime); |
9de87eea | 1679 | waitptr = &waittime; |
d823b11b MV |
1680 | } |
1681 | ||
2a1d0688 | 1682 | return fat_mutex_unlock (mx, cv, waitptr, 1) ? SCM_BOOL_T : SCM_BOOL_F; |
5f05c406 | 1683 | } |
d823b11b | 1684 | #undef FUNC_NAME |
5f05c406 | 1685 | |
9de87eea MV |
1686 | static void |
1687 | fat_cond_signal (fat_cond *c) | |
1688 | { | |
9de87eea | 1689 | unblock_from_queue (c->waiting); |
9de87eea MV |
1690 | } |
1691 | ||
d823b11b MV |
1692 | SCM_DEFINE (scm_signal_condition_variable, "signal-condition-variable", 1, 0, 0, |
1693 | (SCM cv), | |
1694 | "Wake up one thread that is waiting for @var{cv}") | |
1695 | #define FUNC_NAME s_scm_signal_condition_variable | |
5f05c406 | 1696 | { |
d823b11b | 1697 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1698 | fat_cond_signal (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1699 | return SCM_BOOL_T; |
5f05c406 | 1700 | } |
d823b11b | 1701 | #undef FUNC_NAME |
5f05c406 | 1702 | |
9de87eea MV |
1703 | static void |
1704 | fat_cond_broadcast (fat_cond *c) | |
1705 | { | |
9de87eea MV |
1706 | while (scm_is_true (unblock_from_queue (c->waiting))) |
1707 | ; | |
9de87eea MV |
1708 | } |
1709 | ||
d823b11b MV |
1710 | SCM_DEFINE (scm_broadcast_condition_variable, "broadcast-condition-variable", 1, 0, 0, |
1711 | (SCM cv), | |
1712 | "Wake up all threads that are waiting for @var{cv}. ") | |
1713 | #define FUNC_NAME s_scm_broadcast_condition_variable | |
5f05c406 | 1714 | { |
d823b11b | 1715 | SCM_VALIDATE_CONDVAR (1, cv); |
9de87eea | 1716 | fat_cond_broadcast (SCM_CONDVAR_DATA (cv)); |
d823b11b | 1717 | return SCM_BOOL_T; |
5f05c406 | 1718 | } |
d823b11b | 1719 | #undef FUNC_NAME |
5f05c406 | 1720 | |
6180e336 NJ |
1721 | SCM_DEFINE (scm_condition_variable_p, "condition-variable?", 1, 0, 0, |
1722 | (SCM obj), | |
1723 | "Return @code{#t} if @var{obj} is a condition variable.") | |
1724 | #define FUNC_NAME s_scm_condition_variable_p | |
1725 | { | |
1726 | return SCM_CONDVARP(obj) ? SCM_BOOL_T : SCM_BOOL_F; | |
1727 | } | |
1728 | #undef FUNC_NAME | |
1729 | ||
d823b11b MV |
1730 | /*** Marking stacks */ |
1731 | ||
1732 | /* XXX - what to do with this? Do we need to handle this for blocked | |
1733 | threads as well? | |
1734 | */ | |
1735 | #ifdef __ia64__ | |
1736 | # define SCM_MARK_BACKING_STORE() do { \ | |
1737 | ucontext_t ctx; \ | |
1738 | SCM_STACKITEM * top, * bot; \ | |
1739 | getcontext (&ctx); \ | |
1740 | scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \ | |
1741 | ((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \ | |
1742 | / sizeof (SCM_STACKITEM))); \ | |
346e4402 | 1743 | bot = (SCM_STACKITEM *) SCM_I_CURRENT_THREAD->register_backing_store_base; \ |
9a5fa6e9 | 1744 | top = (SCM_STACKITEM *) scm_ia64_ar_bsp (&ctx); \ |
d823b11b MV |
1745 | scm_mark_locations (bot, top - bot); } while (0) |
1746 | #else | |
1747 | # define SCM_MARK_BACKING_STORE() | |
1748 | #endif | |
1749 | ||
6087fad9 | 1750 | |
8c2b3143 | 1751 | \f |
d823b11b MV |
1752 | /*** Select */ |
1753 | ||
8c2b3143 LC |
1754 | struct select_args |
1755 | { | |
1756 | int nfds; | |
1757 | SELECT_TYPE *read_fds; | |
1758 | SELECT_TYPE *write_fds; | |
1759 | SELECT_TYPE *except_fds; | |
1760 | struct timeval *timeout; | |
1761 | ||
1762 | int result; | |
1763 | int errno_value; | |
1764 | }; | |
1765 | ||
1766 | static void * | |
1767 | do_std_select (void *args) | |
1768 | { | |
1769 | struct select_args *select_args; | |
1770 | ||
1771 | select_args = (struct select_args *) args; | |
1772 | ||
1773 | select_args->result = | |
1774 | select (select_args->nfds, | |
1775 | select_args->read_fds, select_args->write_fds, | |
1776 | select_args->except_fds, select_args->timeout); | |
1777 | select_args->errno_value = errno; | |
1778 | ||
1779 | return NULL; | |
1780 | } | |
1781 | ||
911782b7 | 1782 | int |
9de87eea MV |
1783 | scm_std_select (int nfds, |
1784 | SELECT_TYPE *readfds, | |
1785 | SELECT_TYPE *writefds, | |
1786 | SELECT_TYPE *exceptfds, | |
1787 | struct timeval *timeout) | |
1788 | { | |
1789 | fd_set my_readfds; | |
1790 | int res, eno, wakeup_fd; | |
1791 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
8c2b3143 | 1792 | struct select_args args; |
9de87eea MV |
1793 | |
1794 | if (readfds == NULL) | |
1795 | { | |
1796 | FD_ZERO (&my_readfds); | |
1797 | readfds = &my_readfds; | |
1798 | } | |
1799 | ||
1800 | while (scm_i_setup_sleep (t, SCM_BOOL_F, NULL, t->sleep_pipe[1])) | |
1801 | SCM_TICK; | |
1802 | ||
1803 | wakeup_fd = t->sleep_pipe[0]; | |
9de87eea MV |
1804 | FD_SET (wakeup_fd, readfds); |
1805 | if (wakeup_fd >= nfds) | |
1806 | nfds = wakeup_fd+1; | |
9de87eea | 1807 | |
8c2b3143 LC |
1808 | args.nfds = nfds; |
1809 | args.read_fds = readfds; | |
1810 | args.write_fds = writefds; | |
1811 | args.except_fds = exceptfds; | |
1812 | args.timeout = timeout; | |
1813 | ||
1814 | /* Explicitly cooperate with the GC. */ | |
1815 | scm_without_guile (do_std_select, &args); | |
1816 | ||
1817 | res = args.result; | |
1818 | eno = args.errno_value; | |
1819 | ||
1820 | t->sleep_fd = -1; | |
9de87eea MV |
1821 | scm_i_reset_sleep (t); |
1822 | ||
1823 | if (res > 0 && FD_ISSET (wakeup_fd, readfds)) | |
1824 | { | |
1825 | char dummy; | |
634aa8de LC |
1826 | full_read (wakeup_fd, &dummy, 1); |
1827 | ||
9de87eea MV |
1828 | FD_CLR (wakeup_fd, readfds); |
1829 | res -= 1; | |
1830 | if (res == 0) | |
1831 | { | |
1832 | eno = EINTR; | |
1833 | res = -1; | |
1834 | } | |
1835 | } | |
d823b11b MV |
1836 | errno = eno; |
1837 | return res; | |
5f05c406 MV |
1838 | } |
1839 | ||
9de87eea | 1840 | /* Convenience API for blocking while in guile mode. */ |
76da80e7 | 1841 | |
9de87eea | 1842 | #if SCM_USE_PTHREAD_THREADS |
92e64b87 | 1843 | |
2956b071 LC |
1844 | /* It seems reasonable to not run procedures related to mutex and condition |
1845 | variables within `GC_do_blocking ()' since, (i) the GC can operate even | |
1846 | without it, and (ii) the only potential gain would be GC latency. See | |
1847 | http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2245/focus=2251 | |
1848 | for a discussion of the pros and cons. */ | |
1849 | ||
9bc4701c | 1850 | int |
9de87eea | 1851 | scm_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
9bc4701c | 1852 | { |
9de87eea | 1853 | int res = scm_i_pthread_mutex_lock (mutex); |
9bc4701c MD |
1854 | return res; |
1855 | } | |
1856 | ||
9de87eea | 1857 | static void |
2b829bbb | 1858 | do_unlock (void *data) |
28d52ebb | 1859 | { |
9de87eea | 1860 | scm_i_pthread_mutex_unlock ((scm_i_pthread_mutex_t *)data); |
28d52ebb MD |
1861 | } |
1862 | ||
1863 | void | |
661ae7ab | 1864 | scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex) |
28d52ebb | 1865 | { |
9de87eea | 1866 | scm_i_scm_pthread_mutex_lock (mutex); |
2b829bbb | 1867 | scm_dynwind_unwind_handler (do_unlock, mutex, SCM_F_WIND_EXPLICITLY); |
28d52ebb MD |
1868 | } |
1869 | ||
9bc4701c | 1870 | int |
9de87eea | 1871 | scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex) |
9bc4701c | 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_wait (cond, mutex); |
d2a51087 | 1876 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea | 1877 | scm_enter_guile (t); |
9bc4701c MD |
1878 | return res; |
1879 | } | |
9bc4701c | 1880 | |
76da80e7 | 1881 | int |
9de87eea MV |
1882 | scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond, |
1883 | scm_i_pthread_mutex_t *mutex, | |
1884 | const scm_t_timespec *wt) | |
76da80e7 | 1885 | { |
9de87eea | 1886 | scm_t_guile_ticket t = scm_leave_guile (); |
d2a51087 | 1887 | ((scm_i_thread *)t)->held_mutex = mutex; |
9de87eea | 1888 | int res = scm_i_pthread_cond_timedwait (cond, mutex, wt); |
d2a51087 | 1889 | ((scm_i_thread *)t)->held_mutex = NULL; |
9de87eea MV |
1890 | scm_enter_guile (t); |
1891 | return res; | |
76da80e7 MV |
1892 | } |
1893 | ||
9de87eea | 1894 | #endif |
76da80e7 | 1895 | |
d823b11b | 1896 | unsigned long |
9de87eea | 1897 | scm_std_usleep (unsigned long usecs) |
5f05c406 | 1898 | { |
d823b11b MV |
1899 | struct timeval tv; |
1900 | tv.tv_usec = usecs % 1000000; | |
1901 | tv.tv_sec = usecs / 1000000; | |
9de87eea MV |
1902 | scm_std_select (0, NULL, NULL, NULL, &tv); |
1903 | return tv.tv_sec * 1000000 + tv.tv_usec; | |
5f05c406 MV |
1904 | } |
1905 | ||
9de87eea MV |
1906 | unsigned int |
1907 | scm_std_sleep (unsigned int secs) | |
6c214b62 | 1908 | { |
d823b11b MV |
1909 | struct timeval tv; |
1910 | tv.tv_usec = 0; | |
1911 | tv.tv_sec = secs; | |
9de87eea | 1912 | scm_std_select (0, NULL, NULL, NULL, &tv); |
d823b11b | 1913 | return tv.tv_sec; |
6c214b62 MD |
1914 | } |
1915 | ||
d823b11b MV |
1916 | /*** Misc */ |
1917 | ||
1918 | SCM_DEFINE (scm_current_thread, "current-thread", 0, 0, 0, | |
1919 | (void), | |
1920 | "Return the thread that called this function.") | |
1921 | #define FUNC_NAME s_scm_current_thread | |
1922 | { | |
9de87eea | 1923 | return SCM_I_CURRENT_THREAD->handle; |
d823b11b MV |
1924 | } |
1925 | #undef FUNC_NAME | |
1926 | ||
9de87eea MV |
1927 | static SCM |
1928 | scm_c_make_list (size_t n, SCM fill) | |
1929 | { | |
1930 | SCM res = SCM_EOL; | |
1931 | while (n-- > 0) | |
1932 | res = scm_cons (fill, res); | |
1933 | return res; | |
1934 | } | |
1935 | ||
d823b11b MV |
1936 | SCM_DEFINE (scm_all_threads, "all-threads", 0, 0, 0, |
1937 | (void), | |
1938 | "Return a list of all threads.") | |
9bc4701c | 1939 | #define FUNC_NAME s_scm_all_threads |
d823b11b | 1940 | { |
9de87eea MV |
1941 | /* We can not allocate while holding the thread_admin_mutex because |
1942 | of the way GC is done. | |
1943 | */ | |
1944 | int n = thread_count; | |
1945 | scm_i_thread *t; | |
1946 | SCM list = scm_c_make_list (n, SCM_UNSPECIFIED), *l; | |
d823b11b | 1947 | |
9de87eea MV |
1948 | scm_i_pthread_mutex_lock (&thread_admin_mutex); |
1949 | l = &list; | |
1950 | for (t = all_threads; t && n > 0; t = t->next_thread) | |
1951 | { | |
2e77f720 LC |
1952 | if (t != scm_i_signal_delivery_thread) |
1953 | { | |
1954 | SCM_SETCAR (*l, t->handle); | |
1955 | l = SCM_CDRLOC (*l); | |
1956 | } | |
9de87eea MV |
1957 | n--; |
1958 | } | |
1959 | *l = SCM_EOL; | |
1960 | scm_i_pthread_mutex_unlock (&thread_admin_mutex); | |
1961 | return list; | |
d823b11b | 1962 | } |
9de87eea | 1963 | #undef FUNC_NAME |
d823b11b MV |
1964 | |
1965 | SCM_DEFINE (scm_thread_exited_p, "thread-exited?", 1, 0, 0, | |
1966 | (SCM thread), | |
1967 | "Return @code{#t} iff @var{thread} has exited.\n") | |
1968 | #define FUNC_NAME s_scm_thread_exited_p | |
1969 | { | |
7888309b | 1970 | return scm_from_bool (scm_c_thread_exited_p (thread)); |
d823b11b MV |
1971 | } |
1972 | #undef FUNC_NAME | |
1973 | ||
911782b7 | 1974 | int |
d823b11b MV |
1975 | scm_c_thread_exited_p (SCM thread) |
1976 | #define FUNC_NAME s_scm_thread_exited_p | |
5f05c406 | 1977 | { |
9de87eea | 1978 | scm_i_thread *t; |
d823b11b | 1979 | SCM_VALIDATE_THREAD (1, thread); |
9de87eea | 1980 | t = SCM_I_THREAD_DATA (thread); |
d823b11b | 1981 | return t->exited; |
5f05c406 | 1982 | } |
d823b11b | 1983 | #undef FUNC_NAME |
5f05c406 | 1984 | |
9de87eea | 1985 | static scm_i_pthread_cond_t wake_up_cond; |
9bc4701c MD |
1986 | static int threads_initialized_p = 0; |
1987 | ||
9bc4701c | 1988 | |
a4d106c7 MV |
1989 | /* This mutex is used by SCM_CRITICAL_SECTION_START/END. |
1990 | */ | |
d1138028 | 1991 | scm_i_pthread_mutex_t scm_i_critical_section_mutex; |
a4d106c7 MV |
1992 | int scm_i_critical_section_level = 0; |
1993 | ||
661ae7ab | 1994 | static SCM dynwind_critical_section_mutex; |
a54a94b3 | 1995 | |
9bc4701c | 1996 | void |
661ae7ab | 1997 | scm_dynwind_critical_section (SCM mutex) |
76da80e7 | 1998 | { |
a4d106c7 | 1999 | if (scm_is_false (mutex)) |
661ae7ab MV |
2000 | mutex = dynwind_critical_section_mutex; |
2001 | scm_dynwind_lock_mutex (mutex); | |
2002 | scm_dynwind_block_asyncs (); | |
9de87eea MV |
2003 | } |
2004 | ||
2005 | /*** Initialization */ | |
2006 | ||
9de87eea MV |
2007 | scm_i_pthread_mutex_t scm_i_misc_mutex; |
2008 | ||
d1138028 MV |
2009 | #if SCM_USE_PTHREAD_THREADS |
2010 | pthread_mutexattr_t scm_i_pthread_mutexattr_recursive[1]; | |
2011 | #endif | |
2012 | ||
9de87eea MV |
2013 | void |
2014 | scm_threads_prehistory (SCM_STACKITEM *base) | |
2015 | { | |
d1138028 MV |
2016 | #if SCM_USE_PTHREAD_THREADS |
2017 | pthread_mutexattr_init (scm_i_pthread_mutexattr_recursive); | |
2018 | pthread_mutexattr_settype (scm_i_pthread_mutexattr_recursive, | |
2019 | PTHREAD_MUTEX_RECURSIVE); | |
2020 | #endif | |
2021 | ||
2022 | scm_i_pthread_mutex_init (&scm_i_critical_section_mutex, | |
2023 | scm_i_pthread_mutexattr_recursive); | |
9de87eea MV |
2024 | scm_i_pthread_mutex_init (&scm_i_misc_mutex, NULL); |
2025 | scm_i_pthread_cond_init (&wake_up_cond, NULL); | |
74926120 | 2026 | |
9de87eea | 2027 | guilify_self_1 (base); |
9bc4701c MD |
2028 | } |
2029 | ||
d823b11b MV |
2030 | scm_t_bits scm_tc16_thread; |
2031 | scm_t_bits scm_tc16_mutex; | |
2032 | scm_t_bits scm_tc16_condvar; | |
7bfd3b9e | 2033 | |
7bfd3b9e | 2034 | void |
9de87eea | 2035 | scm_init_threads () |
7bfd3b9e | 2036 | { |
9de87eea | 2037 | scm_tc16_thread = scm_make_smob_type ("thread", sizeof (scm_i_thread)); |
d823b11b | 2038 | scm_set_smob_print (scm_tc16_thread, thread_print); |
a4a141f6 | 2039 | scm_set_smob_free (scm_tc16_thread, thread_free); /* XXX: Could be removed */ |
d823b11b | 2040 | |
9de87eea | 2041 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (fat_mutex)); |
9de87eea MV |
2042 | scm_set_smob_print (scm_tc16_mutex, fat_mutex_print); |
2043 | scm_set_smob_free (scm_tc16_mutex, fat_mutex_free); | |
9bc4701c | 2044 | |
9de87eea MV |
2045 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", |
2046 | sizeof (fat_cond)); | |
9de87eea MV |
2047 | scm_set_smob_print (scm_tc16_condvar, fat_cond_print); |
2048 | scm_set_smob_free (scm_tc16_condvar, fat_cond_free); | |
d823b11b | 2049 | |
9de87eea MV |
2050 | scm_i_default_dynamic_state = SCM_BOOL_F; |
2051 | guilify_self_2 (SCM_BOOL_F); | |
9bc4701c | 2052 | threads_initialized_p = 1; |
a4d106c7 | 2053 | |
661ae7ab | 2054 | dynwind_critical_section_mutex = |
a4d106c7 | 2055 | scm_permanent_object (scm_make_recursive_mutex ()); |
7bfd3b9e | 2056 | } |
89e00824 | 2057 | |
5f05c406 | 2058 | void |
9de87eea | 2059 | scm_init_threads_default_dynamic_state () |
5f05c406 | 2060 | { |
9de87eea MV |
2061 | SCM state = scm_make_dynamic_state (scm_current_dynamic_state ()); |
2062 | scm_i_default_dynamic_state = scm_permanent_object (state); | |
5f05c406 MV |
2063 | } |
2064 | ||
d823b11b | 2065 | void |
9de87eea | 2066 | scm_init_thread_procs () |
d823b11b | 2067 | { |
9de87eea | 2068 | #include "libguile/threads.x" |
d823b11b MV |
2069 | } |
2070 | ||
3c13664e LC |
2071 | \f |
2072 | /* IA64-specific things. */ | |
2073 | ||
2074 | #ifdef __ia64__ | |
2075 | # ifdef __hpux | |
2076 | # include <sys/param.h> | |
2077 | # include <sys/pstat.h> | |
2078 | void * | |
2079 | scm_ia64_register_backing_store_base (void) | |
2080 | { | |
2081 | struct pst_vm_status vm_status; | |
2082 | int i = 0; | |
2083 | while (pstat_getprocvm (&vm_status, sizeof (vm_status), 0, i++) == 1) | |
2084 | if (vm_status.pst_type == PS_RSESTACK) | |
2085 | return (void *) vm_status.pst_vaddr; | |
2086 | abort (); | |
2087 | } | |
2088 | void * | |
2089 | scm_ia64_ar_bsp (const void *ctx) | |
2090 | { | |
2091 | uint64_t bsp; | |
2092 | __uc_get_ar_bsp (ctx, &bsp); | |
2093 | return (void *) bsp; | |
2094 | } | |
2095 | # endif /* hpux */ | |
2096 | # ifdef linux | |
2097 | # include <ucontext.h> | |
2098 | void * | |
2099 | scm_ia64_register_backing_store_base (void) | |
2100 | { | |
2101 | extern void *__libc_ia64_register_backing_store_base; | |
2102 | return __libc_ia64_register_backing_store_base; | |
2103 | } | |
2104 | void * | |
2105 | scm_ia64_ar_bsp (const void *opaque) | |
2106 | { | |
2107 | const ucontext_t *ctx = opaque; | |
2108 | return (void *) ctx->uc_mcontext.sc_ar_bsp; | |
2109 | } | |
2110 | # endif /* linux */ | |
2111 | #endif /* __ia64__ */ | |
2112 | ||
2113 | ||
89e00824 ML |
2114 | /* |
2115 | Local Variables: | |
2116 | c-file-style: "gnu" | |
2117 | End: | |
2118 | */ |