1 #define PERL_NO_GET_CONTEXT
2 #include "EXTERN.h"
3 #include "perl.h"
4 #include "XSUB.h"
5
6 /* Magic signature for Thread's mg_private is "Th" */
7 #define Thread_MAGIC_SIGNATURE 0x5468
8
9 #ifdef __cplusplus
10 #ifdef I_UNISTD
11 #include <unistd.h>
12 #endif
13 #endif
14 #include <fcntl.h>
15
16 static int sig_pipe[2];
17
18 #ifndef THREAD_RET_TYPE
19 #define THREAD_RET_TYPE void *
20 #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
21 #endif
22
23 static void
remove_thread(pTHX_ Thread t)24 remove_thread(pTHX_ Thread t)
25 {
26 #ifdef USE_5005THREADS
27 DEBUG_S(WITH_THR(PerlIO_printf(Perl_debug_log,
28 "%p: remove_thread %p\n", thr, t)));
29 MUTEX_LOCK(&PL_threads_mutex);
30 MUTEX_DESTROY(&t->mutex);
31 PL_nthreads--;
32 t->prev->next = t->next;
33 t->next->prev = t->prev;
34 SvREFCNT_dec(t->oursv);
35 COND_BROADCAST(&PL_nthreads_cond);
36 MUTEX_UNLOCK(&PL_threads_mutex);
37 #endif
38 }
39
40 static THREAD_RET_TYPE
threadstart(void * arg)41 threadstart(void *arg)
42 {
43 #ifdef USE_5005THREADS
44 #ifdef FAKE_THREADS
45 Thread savethread = thr;
46 LOGOP myop;
47 dSP;
48 I32 oldscope = PL_scopestack_ix;
49 I32 retval;
50 AV *av;
51 int i;
52
53 DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
54 thr, SvPEEK(TOPs)));
55 thr = (Thread) arg;
56 savemark = TOPMARK;
57 thr->prev = thr->prev_run = savethread;
58 thr->next = savethread->next;
59 thr->next_run = savethread->next_run;
60 savethread->next = savethread->next_run = thr;
61 thr->wait_queue = 0;
62 thr->private = 0;
63
64 /* Now duplicate most of perl_call_sv but with a few twists */
65 PL_op = (OP*)&myop;
66 Zero(PL_op, 1, LOGOP);
67 myop.op_flags = OPf_STACKED;
68 myop.op_next = Nullop;
69 myop.op_flags |= OPf_KNOW;
70 myop.op_flags |= OPf_WANT_LIST;
71 PL_op = pp_entersub(ARGS);
72 DEBUG_S(if (!PL_op)
73 PerlIO_printf(Perl_debug_log, "thread starts at Nullop\n"));
74 /*
75 * When this thread is next scheduled, we start in the right
76 * place. When the thread runs off the end of the sub, perl.c
77 * handles things, using savemark to figure out how much of the
78 * stack is the return value for any join.
79 */
80 thr = savethread; /* back to the old thread */
81 return 0;
82 #else
83 Thread thr = (Thread) arg;
84 dSP;
85 I32 oldmark = TOPMARK;
86 I32 retval;
87 SV *sv;
88 AV *av;
89 int i;
90
91 #if defined(MULTIPLICITY)
92 PERL_SET_INTERP(thr->interp);
93 #endif
94
95 DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p waiting to start\n",
96 thr));
97
98 /*
99 * Wait until our creator releases us. If we didn't do this, then
100 * it would be potentially possible for out thread to carry on and
101 * do stuff before our creator fills in our "self" field. For example,
102 * if we went and created another thread which tried to JOIN with us,
103 * then we'd be in a mess.
104 */
105 MUTEX_LOCK(&thr->mutex);
106 MUTEX_UNLOCK(&thr->mutex);
107
108 /*
109 * It's safe to wait until now to set the thread-specific pointer
110 * from our pthread_t structure to our struct perl_thread, since
111 * we're the only thread who can get at it anyway.
112 */
113 PERL_SET_THX(thr);
114
115 DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
116 thr, SvPEEK(TOPs)));
117
118 av = newAV();
119 sv = POPs;
120 PUTBACK;
121 ENTER;
122 SAVETMPS;
123 perl_call_sv(sv, G_ARRAY|G_EVAL);
124 SPAGAIN;
125 retval = SP - (PL_stack_base + oldmark);
126 SP = PL_stack_base + oldmark + 1;
127 if (SvCUR(thr->errsv)) {
128 MUTEX_LOCK(&thr->mutex);
129 thr->flags |= THRf_DID_DIE;
130 MUTEX_UNLOCK(&thr->mutex);
131 av_store(av, 0, &PL_sv_no);
132 av_store(av, 1, newSVsv(thr->errsv));
133 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p died: %s\n",
134 thr, SvPV(thr->errsv, PL_na)));
135 }
136 else {
137 DEBUG_S(STMT_START {
138 for (i = 1; i <= retval; i++) {
139 PerlIO_printf(Perl_debug_log, "%p return[%d] = %s\n",
140 thr, i, SvPEEK(SP[i - 1]));
141 }
142 } STMT_END);
143 av_store(av, 0, &PL_sv_yes);
144 for (i = 1; i <= retval; i++, SP++)
145 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
146 }
147 FREETMPS;
148 LEAVE;
149
150 #if 0
151 /* removed for debug */
152 SvREFCNT_dec(PL_curstack);
153 #endif
154 SvREFCNT_dec(thr->cvcache);
155 SvREFCNT_dec(thr->threadsv);
156 SvREFCNT_dec(thr->specific);
157 SvREFCNT_dec(thr->errsv);
158
159 /*Safefree(cxstack);*/
160 while (PL_curstackinfo->si_next)
161 PL_curstackinfo = PL_curstackinfo->si_next;
162 while (PL_curstackinfo) {
163 PERL_SI *p = PL_curstackinfo->si_prev;
164 SvREFCNT_dec(PL_curstackinfo->si_stack);
165 Safefree(PL_curstackinfo->si_cxstack);
166 Safefree(PL_curstackinfo);
167 PL_curstackinfo = p;
168 }
169 Safefree(PL_markstack);
170 Safefree(PL_scopestack);
171 Safefree(PL_savestack);
172 Safefree(PL_retstack);
173 Safefree(PL_tmps_stack);
174 SvREFCNT_dec(PL_ofs_sv);
175
176 SvREFCNT_dec(PL_rs);
177 SvREFCNT_dec(PL_statname);
178 SvREFCNT_dec(PL_errors);
179 Safefree(PL_screamfirst);
180 Safefree(PL_screamnext);
181 Safefree(PL_reg_start_tmp);
182 SvREFCNT_dec(PL_lastscream);
183 SvREFCNT_dec(PL_defoutgv);
184 Safefree(PL_reg_poscache);
185
186 MUTEX_LOCK(&thr->mutex);
187 thr->thr_done = 1;
188 DEBUG_S(PerlIO_printf(Perl_debug_log,
189 "%p: threadstart finishing: state is %u\n",
190 thr, ThrSTATE(thr)));
191 switch (ThrSTATE(thr)) {
192 case THRf_R_JOINABLE:
193 ThrSETSTATE(thr, THRf_ZOMBIE);
194 MUTEX_UNLOCK(&thr->mutex);
195 DEBUG_S(PerlIO_printf(Perl_debug_log,
196 "%p: R_JOINABLE thread finished\n", thr));
197 break;
198 case THRf_R_JOINED:
199 ThrSETSTATE(thr, THRf_DEAD);
200 MUTEX_UNLOCK(&thr->mutex);
201 remove_thread(aTHX_ thr);
202 DEBUG_S(PerlIO_printf(Perl_debug_log,
203 "%p: R_JOINED thread finished\n", thr));
204 break;
205 case THRf_R_DETACHED:
206 ThrSETSTATE(thr, THRf_DEAD);
207 MUTEX_UNLOCK(&thr->mutex);
208 SvREFCNT_dec(av);
209 DEBUG_S(PerlIO_printf(Perl_debug_log,
210 "%p: DETACHED thread finished\n", thr));
211 remove_thread(aTHX_ thr); /* This might trigger main thread to finish */
212 break;
213 default:
214 MUTEX_UNLOCK(&thr->mutex);
215 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
216 /* NOTREACHED */
217 }
218 return THREAD_RET_CAST(av); /* Available for anyone to join with */
219 /* us unless we're detached, in which */
220 /* case noone sees the value anyway. */
221 #endif
222 #else
223 return THREAD_RET_CAST(NULL);
224 #endif
225 }
226
227 static SV *
newthread(pTHX_ SV * startsv,AV * initargs,char * classname)228 newthread (pTHX_ SV *startsv, AV *initargs, char *classname)
229 {
230 #ifdef USE_5005THREADS
231 dSP;
232 Thread savethread;
233 int i;
234 SV *sv;
235 int err;
236 #ifndef THREAD_CREATE
237 static pthread_attr_t attr;
238 static int attr_inited = 0;
239 sigset_t fullmask, oldmask;
240 static int attr_joinable = PTHREAD_CREATE_JOINABLE;
241 #endif
242
243 if (ckWARN(WARN_DEPRECATED))
244 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
245 "5.005 threads are deprecated");
246 savethread = thr;
247 thr = new_struct_thread(thr);
248 /* temporarily pretend to be the child thread in case the
249 * XPUSHs() below want to grow the child's stack. This is
250 * safe, since the other thread is not yet created, and we
251 * are the only ones who know about it */
252 PERL_SET_THX(thr);
253 SPAGAIN;
254 DEBUG_S(PerlIO_printf(Perl_debug_log,
255 "%p: newthread (%p), tid is %u, preparing stack\n",
256 savethread, thr, thr->tid));
257 /* The following pushes the arg list and startsv onto the *new* stack */
258 PUSHMARK(SP);
259 /* Could easily speed up the following greatly */
260 for (i = 0; i <= AvFILL(initargs); i++)
261 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
262 XPUSHs(SvREFCNT_inc(startsv));
263 PUTBACK;
264
265 /* On your marks... */
266 PERL_SET_THX(savethread);
267 MUTEX_LOCK(&thr->mutex);
268
269 #ifdef THREAD_CREATE
270 err = THREAD_CREATE(thr, threadstart);
271 #else
272 /* Get set... */
273 sigfillset(&fullmask);
274 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
275 croak("panic: sigprocmask");
276 err = 0;
277 if (!attr_inited) {
278 attr_inited = 1;
279 err = pthread_attr_init(&attr);
280 # ifdef THREAD_CREATE_NEEDS_STACK
281 if (err == 0)
282 err = pthread_attr_setstacksize(&attr, THREAD_CREATE_NEEDS_STACK);
283 if (err)
284 croak("panic: pthread_attr_setstacksize failed");
285 # endif
286 # ifdef PTHREAD_ATTR_SETDETACHSTATE
287 if (err == 0)
288 err = PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
289 if (err)
290 croak("panic: pthread_attr_setdetachstate failed");
291 # else
292 croak("panic: can't pthread_attr_setdetachstate");
293 # endif
294 }
295 if (err == 0)
296 err = PTHREAD_CREATE(&thr->self, attr, threadstart, (void*) thr);
297 #endif
298
299 if (err) {
300 MUTEX_UNLOCK(&thr->mutex);
301 DEBUG_S(PerlIO_printf(Perl_debug_log,
302 "%p: create of %p failed %d\n",
303 savethread, thr, err));
304 /* Thread creation failed--clean up */
305 SvREFCNT_dec(thr->cvcache);
306 remove_thread(aTHX_ thr);
307 for (i = 0; i <= AvFILL(initargs); i++)
308 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
309 SvREFCNT_dec(startsv);
310 return NULL;
311 }
312
313 #ifdef THREAD_POST_CREATE
314 THREAD_POST_CREATE(thr);
315 #else
316 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
317 croak("panic: sigprocmask");
318 #endif
319
320 sv = newSViv(thr->tid);
321 sv_magic(sv, thr->oursv, '~', 0, 0);
322 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
323 sv = sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
324
325 /* Go */
326 MUTEX_UNLOCK(&thr->mutex);
327
328 return sv;
329 #else
330 # ifdef USE_ITHREADS
331 croak("This perl was built for \"ithreads\", which currently does not support Thread.pm.\n"
332 "Run \"perldoc Thread\" for more information");
333 # else
334 croak("This perl was not built with support for 5.005-style threads.\n"
335 "Run \"perldoc Thread\" for more information");
336 # endif
337 return &PL_sv_undef;
338 #endif
339 }
340
341 static Signal_t handle_thread_signal (int sig);
342
343 static Signal_t
handle_thread_signal(int sig)344 handle_thread_signal(int sig)
345 {
346 unsigned char c = (unsigned char) sig;
347 dTHX;
348 /*
349 * We're not really allowed to call fprintf in a signal handler
350 * so don't be surprised if this isn't robust while debugging
351 * with -DL.
352 */
353 DEBUG_S(PerlIO_printf(Perl_debug_log,
354 "handle_thread_signal: got signal %d\n", sig));
355 write(sig_pipe[1], &c, 1);
356 }
357
358 MODULE = Thread PACKAGE = Thread
359 PROTOTYPES: DISABLE
360
361 void
362 new(classname, startsv, ...)
363 char * classname
364 SV * startsv
365 AV * av = av_make(items - 2, &ST(2));
366 PPCODE:
367 XPUSHs(sv_2mortal(newthread(aTHX_ startsv, av, classname)));
368
369 void
370 join(t)
371 Thread t
372 PREINIT:
373 #ifdef USE_5005THREADS
374 AV * av;
375 int i;
376 #endif
377 PPCODE:
378 #ifdef USE_5005THREADS
379 if (t == thr)
380 croak("Attempt to join self");
381 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: joining %p (state %u)\n",
382 thr, t, ThrSTATE(t)));
383 MUTEX_LOCK(&t->mutex);
384 switch (ThrSTATE(t)) {
385 case THRf_R_JOINABLE:
386 case THRf_R_JOINED:
387 ThrSETSTATE(t, THRf_R_JOINED);
388 MUTEX_UNLOCK(&t->mutex);
389 break;
390 case THRf_ZOMBIE:
391 ThrSETSTATE(t, THRf_DEAD);
392 MUTEX_UNLOCK(&t->mutex);
393 remove_thread(aTHX_ t);
394 break;
395 default:
396 MUTEX_UNLOCK(&t->mutex);
397 croak("can't join with thread");
398 /* NOTREACHED */
399 }
400 JOIN(t, &av);
401
402 sv_2mortal((SV*)av);
403
404 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
405 /* Could easily speed up the following if necessary */
406 for (i = 1; i <= AvFILL(av); i++)
407 XPUSHs(*av_fetch(av, i, FALSE));
408 }
409 else {
410 STRLEN n_a;
411 char *mess = SvPV(*av_fetch(av, 1, FALSE), n_a);
412 DEBUG_S(PerlIO_printf(Perl_debug_log,
413 "%p: join propagating die message: %s\n",
414 thr, mess));
415 croak(mess);
416 }
417 #endif
418
419 void
420 detach(t)
421 Thread t
422 CODE:
423 #ifdef USE_5005THREADS
424 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: detaching %p (state %u)\n",
425 thr, t, ThrSTATE(t)));
426 MUTEX_LOCK(&t->mutex);
427 switch (ThrSTATE(t)) {
428 case THRf_R_JOINABLE:
429 ThrSETSTATE(t, THRf_R_DETACHED);
430 /* fall through */
431 case THRf_R_DETACHED:
432 DETACH(t);
433 MUTEX_UNLOCK(&t->mutex);
434 break;
435 case THRf_ZOMBIE:
436 ThrSETSTATE(t, THRf_DEAD);
437 DETACH(t);
438 MUTEX_UNLOCK(&t->mutex);
439 remove_thread(aTHX_ t);
440 break;
441 default:
442 MUTEX_UNLOCK(&t->mutex);
443 croak("can't detach thread");
444 /* NOTREACHED */
445 }
446 #endif
447
448 void
449 equal(t1, t2)
450 Thread t1
451 Thread t2
452 PPCODE:
453 PUSHs((t1 == t2) ? &PL_sv_yes : &PL_sv_no);
454
455 void
456 flags(t)
457 Thread t
458 PPCODE:
459 #ifdef USE_5005THREADS
460 PUSHs(sv_2mortal(newSViv(t->flags)));
461 #endif
462
463 void
464 done(t)
465 Thread t
466 PPCODE:
467 #ifdef USE_5005THREADS
468 PUSHs(t->thr_done ? &PL_sv_yes : &PL_sv_no);
469 #endif
470
471 void
472 self(classname)
473 char * classname
474 PREINIT:
475 #ifdef USE_5005THREADS
476 SV *sv;
477 #endif
478 PPCODE:
479 #ifdef USE_5005THREADS
480 sv = newSViv(thr->tid);
481 sv_magic(sv, thr->oursv, '~', 0, 0);
482 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
483 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
484 gv_stashpv(classname, TRUE))));
485 #endif
486
487 U32
488 tid(t)
489 Thread t
490 CODE:
491 #ifdef USE_5005THREADS
492 MUTEX_LOCK(&t->mutex);
493 RETVAL = t->tid;
494 MUTEX_UNLOCK(&t->mutex);
495 #else
496 RETVAL = 0;
497 #endif
498 OUTPUT:
499 RETVAL
500
501 void
502 DESTROY(t)
503 SV * t
504 PPCODE:
505 PUSHs(t ? &PL_sv_yes : &PL_sv_no);
506
507 void
yield()508 yield()
509 CODE:
510 {
511 #ifdef USE_5005THREADS
512 YIELD;
513 #endif
514 }
515
516 void
517 cond_wait(sv)
518 SV * sv
519 PREINIT:
520 #ifdef USE_5005THREADS
521 MAGIC * mg;
522 #endif
523 CODE:
524 #ifdef USE_5005THREADS
525 if (SvROK(sv))
526 sv = SvRV(sv);
527
528 mg = condpair_magic(sv);
529 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_wait %p\n", thr, sv));
530 MUTEX_LOCK(MgMUTEXP(mg));
531 if (MgOWNER(mg) != thr) {
532 MUTEX_UNLOCK(MgMUTEXP(mg));
533 croak("cond_wait for lock that we don't own\n");
534 }
535 MgOWNER(mg) = 0;
536 COND_SIGNAL(MgOWNERCONDP(mg));
537 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
538 while (MgOWNER(mg))
539 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
540 MgOWNER(mg) = thr;
541 MUTEX_UNLOCK(MgMUTEXP(mg));
542 #endif
543
544 void
545 cond_signal(sv)
546 SV * sv
547 PREINIT:
548 #ifdef USE_5005THREADS
549 MAGIC * mg;
550 #endif
551 CODE:
552 #ifdef USE_5005THREADS
553 if (SvROK(sv))
554 sv = SvRV(sv);
555
556 mg = condpair_magic(sv);
557 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_signal %p\n",thr,sv));
558 MUTEX_LOCK(MgMUTEXP(mg));
559 if (MgOWNER(mg) != thr) {
560 MUTEX_UNLOCK(MgMUTEXP(mg));
561 croak("cond_signal for lock that we don't own\n");
562 }
563 COND_SIGNAL(MgCONDP(mg));
564 MUTEX_UNLOCK(MgMUTEXP(mg));
565 #endif
566
567 void
568 cond_broadcast(sv)
569 SV * sv
570 PREINIT:
571 #ifdef USE_5005THREADS
572 MAGIC * mg;
573 #endif
574 CODE:
575 #ifdef USE_5005THREADS
576 if (SvROK(sv))
577 sv = SvRV(sv);
578
579 mg = condpair_magic(sv);
580 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_broadcast %p\n",
581 thr, sv));
582 MUTEX_LOCK(MgMUTEXP(mg));
583 if (MgOWNER(mg) != thr) {
584 MUTEX_UNLOCK(MgMUTEXP(mg));
585 croak("cond_broadcast for lock that we don't own\n");
586 }
587 COND_BROADCAST(MgCONDP(mg));
588 MUTEX_UNLOCK(MgMUTEXP(mg));
589 #endif
590
591 void
592 list(classname)
593 char * classname
594 PREINIT:
595 #ifdef USE_5005THREADS
596 Thread t;
597 AV * av;
598 SV ** svp;
599 int n = 0;
600 #endif
601 PPCODE:
602 #ifdef USE_5005THREADS
603 av = newAV();
604 /*
605 * Iterate until we have enough dynamic storage for all threads.
606 * We mustn't do any allocation while holding threads_mutex though.
607 */
608 MUTEX_LOCK(&PL_threads_mutex);
609 do {
610 n = PL_nthreads;
611 MUTEX_UNLOCK(&PL_threads_mutex);
612 if (AvFILL(av) < n - 1) {
613 int i = AvFILL(av);
614 for (i = AvFILL(av); i < n - 1; i++) {
615 SV *sv = newSViv(0); /* fill in tid later */
616 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
617 av_push(av, sv_bless(newRV_noinc(sv),
618 gv_stashpv(classname, TRUE)));
619
620 }
621 }
622 MUTEX_LOCK(&PL_threads_mutex);
623 } while (n < PL_nthreads);
624 n = PL_nthreads; /* Get the final correct value */
625
626 /*
627 * At this point, there's enough room to fill in av.
628 * Note that we are holding threads_mutex so the list
629 * won't change out from under us but all the remaining
630 * processing is "fast" (no blocking, malloc etc.)
631 */
632 t = thr;
633 svp = AvARRAY(av);
634 do {
635 SV *sv = (SV*)SvRV(*svp);
636 sv_setiv(sv, t->tid);
637 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
638 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
639 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
640 t = t->next;
641 svp++;
642 } while (t != thr);
643 /* */
644 MUTEX_UNLOCK(&PL_threads_mutex);
645 /* Truncate any unneeded slots in av */
646 av_fill(av, n - 1);
647 /* Finally, push all the new objects onto the stack and drop av */
648 EXTEND(SP, n);
649 for (svp = AvARRAY(av); n > 0; n--, svp++)
650 PUSHs(*svp);
651 (void)sv_2mortal((SV*)av);
652 #endif
653
654
655 MODULE = Thread PACKAGE = Thread::Signal
656
657 void
658 kill_sighandler_thread()
659 PPCODE:
660 write(sig_pipe[1], "\0", 1);
661 PUSHs(&PL_sv_yes);
662
663 void
664 init_thread_signals()
665 PPCODE:
666 PL_sighandlerp = handle_thread_signal;
667 if (pipe(sig_pipe) == -1)
668 XSRETURN_UNDEF;
669 PUSHs(&PL_sv_yes);
670
671 void
672 await_signal()
673 PREINIT:
674 unsigned char c;
675 SSize_t ret;
676 CODE:
677 do {
678 ret = read(sig_pipe[0], &c, 1);
679 } while (ret == -1 && errno == EINTR);
680 if (ret == -1)
681 croak("panic: await_signal");
682 ST(0) = sv_newmortal();
683 if (ret)
684 sv_setsv(ST(0), c ? PL_psig_ptr[c] : &PL_sv_no);
685 DEBUG_S(PerlIO_printf(Perl_debug_log,
686 "await_signal returning %s\n", SvPEEK(ST(0))));
687
688 MODULE = Thread PACKAGE = Thread::Specific
689
690 void
691 data(classname = "Thread::Specific")
692 char * classname
693 PPCODE:
694 #ifdef USE_5005THREADS
695 if (AvFILL(thr->specific) == -1) {
696 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
697 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
698 }
699 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));
700 #endif
701