1 #define PERL_NO_GET_CONTEXT
6 /* Magic signature for Thread's mg_private is "Th" */
7 #define Thread_MAGIC_SIGNATURE 0x5468
16 static int sig_pipe[2];
18 #ifndef THREAD_RET_TYPE
19 #define THREAD_RET_TYPE void *
20 #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
24 remove_thread(pTHX_ struct perl_thread *t)
27 DEBUG_S(WITH_THR(PerlIO_printf(PerlIO_stderr(),
28 "%p: remove_thread %p\n", thr, t)));
29 MUTEX_LOCK(&PL_threads_mutex);
30 MUTEX_DESTROY(&t->mutex);
32 t->prev->next = t->next;
33 t->next->prev = t->prev;
34 COND_BROADCAST(&PL_nthreads_cond);
35 MUTEX_UNLOCK(&PL_threads_mutex);
39 static THREAD_RET_TYPE
40 threadstart(void *arg)
44 Thread savethread = thr;
47 I32 oldscope = PL_scopestack_ix;
52 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
56 thr->prev = thr->prev_run = savethread;
57 thr->next = savethread->next;
58 thr->next_run = savethread->next_run;
59 savethread->next = savethread->next_run = thr;
63 /* Now duplicate most of perl_call_sv but with a few twists */
65 Zero(PL_op, 1, LOGOP);
66 myop.op_flags = OPf_STACKED;
67 myop.op_next = Nullop;
68 myop.op_flags |= OPf_KNOW;
69 myop.op_flags |= OPf_WANT_LIST;
70 PL_op = pp_entersub(ARGS);
72 PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
74 * When this thread is next scheduled, we start in the right
75 * place. When the thread runs off the end of the sub, perl.c
76 * handles things, using savemark to figure out how much of the
77 * stack is the return value for any join.
79 thr = savethread; /* back to the old thread */
82 Thread thr = (Thread) arg;
85 I32 oldmark = TOPMARK;
86 I32 oldscope = PL_scopestack_ix;
92 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
95 /* Don't call *anything* requiring dTHR until after SET_THR() */
97 * Wait until our creator releases us. If we didn't do this, then
98 * it would be potentially possible for out thread to carry on and
99 * do stuff before our creator fills in our "self" field. For example,
100 * if we went and created another thread which tried to JOIN with us,
101 * then we'd be in a mess.
103 MUTEX_LOCK(&thr->mutex);
104 MUTEX_UNLOCK(&thr->mutex);
107 * It's safe to wait until now to set the thread-specific pointer
108 * from our pthread_t structure to our struct perl_thread, since
109 * we're the only thread who can get at it anyway.
113 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
114 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
121 perl_call_sv(sv, G_ARRAY|G_EVAL);
123 retval = SP - (PL_stack_base + oldmark);
124 SP = PL_stack_base + oldmark + 1;
125 if (SvCUR(thr->errsv)) {
126 MUTEX_LOCK(&thr->mutex);
127 thr->flags |= THRf_DID_DIE;
128 MUTEX_UNLOCK(&thr->mutex);
129 av_store(av, 0, &PL_sv_no);
130 av_store(av, 1, newSVsv(thr->errsv));
131 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p died: %s\n",
132 thr, SvPV(thr->errsv, PL_na)));
135 for (i = 1; i <= retval; i++) {
136 PerlIO_printf(PerlIO_stderr(), "%p return[%d] = %s\n",
137 thr, i, SvPEEK(SP[i - 1]));
140 av_store(av, 0, &PL_sv_yes);
141 for (i = 1; i <= retval; i++, SP++)
142 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
149 /* removed for debug */
150 SvREFCNT_dec(PL_curstack);
152 SvREFCNT_dec(thr->cvcache);
153 SvREFCNT_dec(thr->threadsv);
154 SvREFCNT_dec(thr->specific);
155 SvREFCNT_dec(thr->errsv);
156 SvREFCNT_dec(thr->errhv);
158 /*Safefree(cxstack);*/
159 while (PL_curstackinfo->si_next)
160 PL_curstackinfo = PL_curstackinfo->si_next;
161 while (PL_curstackinfo) {
162 PERL_SI *p = PL_curstackinfo->si_prev;
163 SvREFCNT_dec(PL_curstackinfo->si_stack);
164 Safefree(PL_curstackinfo->si_cxstack);
165 Safefree(PL_curstackinfo);
168 Safefree(PL_markstack);
169 Safefree(PL_scopestack);
170 Safefree(PL_savestack);
171 Safefree(PL_retstack);
172 Safefree(PL_tmps_stack);
176 SvREFCNT_dec(PL_nrs);
177 SvREFCNT_dec(PL_statname);
178 Safefree(PL_screamfirst);
179 Safefree(PL_screamnext);
180 Safefree(PL_reg_start_tmp);
181 SvREFCNT_dec(PL_lastscream);
182 SvREFCNT_dec(PL_defoutgv);
184 MUTEX_LOCK(&thr->mutex);
185 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
186 "%p: threadstart finishing: state is %u\n",
187 thr, ThrSTATE(thr)));
188 switch (ThrSTATE(thr)) {
189 case THRf_R_JOINABLE:
190 ThrSETSTATE(thr, THRf_ZOMBIE);
191 MUTEX_UNLOCK(&thr->mutex);
192 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
193 "%p: R_JOINABLE thread finished\n", thr));
196 ThrSETSTATE(thr, THRf_DEAD);
197 MUTEX_UNLOCK(&thr->mutex);
198 remove_thread(aTHX_ thr);
199 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
200 "%p: R_JOINED thread finished\n", thr));
202 case THRf_R_DETACHED:
203 ThrSETSTATE(thr, THRf_DEAD);
204 MUTEX_UNLOCK(&thr->mutex);
206 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
207 "%p: DETACHED thread finished\n", thr));
208 remove_thread(aTHX_ thr); /* This might trigger main thread to finish */
211 MUTEX_UNLOCK(&thr->mutex);
212 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
215 return THREAD_RET_CAST(av); /* Available for anyone to join with */
216 /* us unless we're detached, in which */
217 /* case noone sees the value anyway. */
220 return THREAD_RET_CAST(NULL);
225 newthread (pTHX_ SV *startsv, AV *initargs, char *classname)
233 #ifndef THREAD_CREATE
234 static pthread_attr_t attr;
235 static int attr_inited = 0;
236 sigset_t fullmask, oldmask;
237 static int attr_joinable = PTHREAD_CREATE_JOINABLE;
241 thr = new_struct_thread(thr);
242 /* temporarily pretend to be the child thread in case the
243 * XPUSHs() below want to grow the child's stack. This is
244 * safe, since the other thread is not yet created, and we
245 * are the only ones who know about it */
248 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
249 "%p: newthread (%p), tid is %u, preparing stack\n",
250 savethread, thr, thr->tid));
251 /* The following pushes the arg list and startsv onto the *new* stack */
253 /* Could easily speed up the following greatly */
254 for (i = 0; i <= AvFILL(initargs); i++)
255 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
256 XPUSHs(SvREFCNT_inc(startsv));
259 /* On your marks... */
261 MUTEX_LOCK(&thr->mutex);
264 err = THREAD_CREATE(thr, threadstart);
267 sigfillset(&fullmask);
268 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
269 croak("panic: sigprocmask");
273 err = pthread_attr_init(&attr);
274 # ifdef PTHREAD_ATTR_SETDETACHSTATE
276 err = PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
279 croak("panic: can't pthread_attr_setdetachstate");
283 err = PTHREAD_CREATE(&thr->self, attr, threadstart, (void*) thr);
287 MUTEX_UNLOCK(&thr->mutex);
288 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
289 "%p: create of %p failed %d\n",
290 savethread, thr, err));
291 /* Thread creation failed--clean up */
292 SvREFCNT_dec(thr->cvcache);
293 remove_thread(aTHX_ thr);
294 MUTEX_DESTROY(&thr->mutex);
295 for (i = 0; i <= AvFILL(initargs); i++)
296 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
297 SvREFCNT_dec(startsv);
301 #ifdef THREAD_POST_CREATE
302 THREAD_POST_CREATE(thr);
304 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
305 croak("panic: sigprocmask");
308 sv = newSViv(thr->tid);
309 sv_magic(sv, thr->oursv, '~', 0, 0);
310 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
311 sv = sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
314 MUTEX_UNLOCK(&thr->mutex);
318 croak("No threads in this perl");
323 static Signal_t handle_thread_signal (int sig);
326 handle_thread_signal(int sig)
329 unsigned char c = (unsigned char) sig;
331 * We're not really allowed to call fprintf in a signal handler
332 * so don't be surprised if this isn't robust while debugging
335 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
336 "handle_thread_signal: got signal %d\n", sig););
337 write(sig_pipe[1], &c, 1);
340 MODULE = Thread PACKAGE = Thread
344 new(classname, startsv, ...)
347 AV * av = av_make(items - 2, &ST(2));
349 XPUSHs(sv_2mortal(newthread(aTHX_ startsv, av, classname)));
359 croak("Attempt to join self");
360 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
361 thr, t, ThrSTATE(t)););
362 MUTEX_LOCK(&t->mutex);
363 switch (ThrSTATE(t)) {
364 case THRf_R_JOINABLE:
366 ThrSETSTATE(t, THRf_R_JOINED);
367 MUTEX_UNLOCK(&t->mutex);
370 ThrSETSTATE(t, THRf_DEAD);
371 MUTEX_UNLOCK(&t->mutex);
372 remove_thread(aTHX_ t);
375 MUTEX_UNLOCK(&t->mutex);
376 croak("can't join with thread");
381 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
382 /* Could easily speed up the following if necessary */
383 for (i = 1; i <= AvFILL(av); i++)
384 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
387 char *mess = SvPV(*av_fetch(av, 1, FALSE), n_a);
388 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
389 "%p: join propagating die message: %s\n",
400 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
401 thr, t, ThrSTATE(t)););
402 MUTEX_LOCK(&t->mutex);
403 switch (ThrSTATE(t)) {
404 case THRf_R_JOINABLE:
405 ThrSETSTATE(t, THRf_R_DETACHED);
407 case THRf_R_DETACHED:
409 MUTEX_UNLOCK(&t->mutex);
412 ThrSETSTATE(t, THRf_DEAD);
414 MUTEX_UNLOCK(&t->mutex);
415 remove_thread(aTHX_ t);
418 MUTEX_UNLOCK(&t->mutex);
419 croak("can't detach thread");
429 PUSHs((t1 == t2) ? &PL_sv_yes : &PL_sv_no);
436 PUSHs(sv_2mortal(newSViv(t->flags)));
446 sv = newSViv(thr->tid);
447 sv_magic(sv, thr->oursv, '~', 0, 0);
448 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
449 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
450 gv_stashpv(classname, TRUE))));
458 MUTEX_LOCK(&t->mutex);
460 MUTEX_UNLOCK(&t->mutex);
491 mg = condpair_magic(sv);
492 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
493 MUTEX_LOCK(MgMUTEXP(mg));
494 if (MgOWNER(mg) != thr) {
495 MUTEX_UNLOCK(MgMUTEXP(mg));
496 croak("cond_wait for lock that we don't own\n");
499 COND_SIGNAL(MgOWNERCONDP(mg));
500 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
502 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
504 MUTEX_UNLOCK(MgMUTEXP(mg));
516 mg = condpair_magic(sv);
517 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
518 MUTEX_LOCK(MgMUTEXP(mg));
519 if (MgOWNER(mg) != thr) {
520 MUTEX_UNLOCK(MgMUTEXP(mg));
521 croak("cond_signal for lock that we don't own\n");
523 COND_SIGNAL(MgCONDP(mg));
524 MUTEX_UNLOCK(MgMUTEXP(mg));
536 mg = condpair_magic(sv);
537 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
539 MUTEX_LOCK(MgMUTEXP(mg));
540 if (MgOWNER(mg) != thr) {
541 MUTEX_UNLOCK(MgMUTEXP(mg));
542 croak("cond_broadcast for lock that we don't own\n");
544 COND_BROADCAST(MgCONDP(mg));
545 MUTEX_UNLOCK(MgMUTEXP(mg));
560 * Iterate until we have enough dynamic storage for all threads.
561 * We mustn't do any allocation while holding threads_mutex though.
563 MUTEX_LOCK(&PL_threads_mutex);
566 MUTEX_UNLOCK(&PL_threads_mutex);
567 if (AvFILL(av) < n - 1) {
569 for (i = AvFILL(av); i < n - 1; i++) {
570 SV *sv = newSViv(0); /* fill in tid later */
571 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
572 av_push(av, sv_bless(newRV_noinc(sv),
573 gv_stashpv(classname, TRUE)));
577 MUTEX_LOCK(&PL_threads_mutex);
578 } while (n < PL_nthreads);
579 n = PL_nthreads; /* Get the final correct value */
582 * At this point, there's enough room to fill in av.
583 * Note that we are holding threads_mutex so the list
584 * won't change out from under us but all the remaining
585 * processing is "fast" (no blocking, malloc etc.)
590 SV *sv = (SV*)SvRV(*svp);
591 sv_setiv(sv, t->tid);
592 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
593 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
594 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
599 MUTEX_UNLOCK(&PL_threads_mutex);
600 /* Truncate any unneeded slots in av */
602 /* Finally, push all the new objects onto the stack and drop av */
604 for (svp = AvARRAY(av); n > 0; n--, svp++)
606 (void)sv_2mortal((SV*)av);
610 MODULE = Thread PACKAGE = Thread::Signal
613 kill_sighandler_thread()
615 write(sig_pipe[1], "\0", 1);
619 init_thread_signals()
621 PL_sighandlerp = handle_thread_signal;
622 if (pipe(sig_pipe) == -1)
633 ret = read(sig_pipe[0], &c, 1);
634 } while (ret == -1 && errno == EINTR);
636 croak("panic: await_signal");
637 ST(0) = sv_newmortal();
639 sv_setsv(ST(0), c ? PL_psig_ptr[c] : &PL_sv_no);
640 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
641 "await_signal returning %s\n", SvPEEK(ST(0))););
643 MODULE = Thread PACKAGE = Thread::Specific
646 data(classname = "Thread::Specific")
650 if (AvFILL(thr->specific) == -1) {
651 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
652 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
654 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));