5 /* Magic signature for Thread's mg_private is "Th" */
6 #define Thread_MAGIC_SIGNATURE 0x5468
15 static int sig_pipe[2];
17 #ifndef THREAD_RET_TYPE
18 #define THREAD_RET_TYPE void *
19 #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
23 remove_thread(struct perl_thread *t)
26 DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
27 "%p: remove_thread %p\n", thr, t)));
28 MUTEX_LOCK(&PL_threads_mutex);
29 MUTEX_DESTROY(&t->mutex);
31 t->prev->next = t->next;
32 t->next->prev = t->prev;
33 COND_BROADCAST(&PL_nthreads_cond);
34 MUTEX_UNLOCK(&PL_threads_mutex);
38 static THREAD_RET_TYPE
39 threadstart(void *arg)
43 Thread savethread = thr;
46 I32 oldscope = scopestack_ix;
51 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
55 thr->prev = thr->prev_run = savethread;
56 thr->next = savethread->next;
57 thr->next_run = savethread->next_run;
58 savethread->next = savethread->next_run = thr;
62 /* Now duplicate most of perl_call_sv but with a few twists */
65 myop.op_flags = OPf_STACKED;
66 myop.op_next = Nullop;
67 myop.op_flags |= OPf_KNOW;
68 myop.op_flags |= OPf_WANT_LIST;
69 op = pp_entersub(ARGS);
71 PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
73 * When this thread is next scheduled, we start in the right
74 * place. When the thread runs off the end of the sub, perl.c
75 * handles things, using savemark to figure out how much of the
76 * stack is the return value for any join.
78 thr = savethread; /* back to the old thread */
81 Thread thr = (Thread) arg;
84 I32 oldmark = TOPMARK;
85 I32 oldscope = PL_scopestack_ix;
91 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
94 /* Don't call *anything* requiring dTHR until after SET_THR() */
96 * Wait until our creator releases us. If we didn't do this, then
97 * it would be potentially possible for out thread to carry on and
98 * do stuff before our creator fills in our "self" field. For example,
99 * if we went and created another thread which tried to JOIN with us,
100 * then we'd be in a mess.
102 MUTEX_LOCK(&thr->mutex);
103 MUTEX_UNLOCK(&thr->mutex);
106 * It's safe to wait until now to set the thread-specific pointer
107 * from our pthread_t structure to our struct perl_thread, since
108 * we're the only thread who can get at it anyway.
112 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
113 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
118 perl_call_sv(sv, G_ARRAY|G_EVAL);
120 retval = SP - (PL_stack_base + oldmark);
121 SP = PL_stack_base + oldmark + 1;
122 if (SvCUR(thr->errsv)) {
123 MUTEX_LOCK(&thr->mutex);
124 thr->flags |= THRf_DID_DIE;
125 MUTEX_UNLOCK(&thr->mutex);
126 av_store(av, 0, &sv_no);
127 av_store(av, 1, newSVsv(thr->errsv));
128 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p died: %s\n",
129 thr, SvPV(thr->errsv, na)));
132 for (i = 1; i <= retval; i++) {
133 PerlIO_printf(PerlIO_stderr(), "%p return[%d] = %s\n",
134 thr, i, SvPEEK(SP[i - 1]));
137 av_store(av, 0, &sv_yes);
138 for (i = 1; i <= retval; i++, SP++)
139 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
144 /* removed for debug */
145 SvREFCNT_dec(curstack);
147 SvREFCNT_dec(thr->cvcache);
148 SvREFCNT_dec(thr->threadsv);
149 SvREFCNT_dec(thr->specific);
150 SvREFCNT_dec(thr->errsv);
151 SvREFCNT_dec(thr->errhv);
153 /*Safefree(cxstack);*/
154 while (PL_curstackinfo->si_next)
155 PL_curstackinfo = PL_curstackinfo->si_next;
156 while (PL_curstackinfo) {
157 PERL_SI *p = PL_curstackinfo->si_prev;
158 SvREFCNT_dec(PL_curstackinfo->si_stack);
159 Safefree(PL_curstackinfo->si_cxstack);
160 Safefree(PL_curstackinfo);
163 Safefree(PL_markstack);
164 Safefree(PL_scopestack);
165 Safefree(PL_savestack);
166 Safefree(PL_retstack);
167 Safefree(PL_tmps_stack);
171 SvREFCNT_dec(PL_nrs);
172 SvREFCNT_dec(PL_statname);
173 Safefree(PL_screamfirst);
174 Safefree(PL_screamnext);
175 Safefree(PL_reg_start_tmp);
176 SvREFCNT_dec(PL_lastscream);
177 /*SvREFCNT_dec(defoutgv);*/
179 MUTEX_LOCK(&thr->mutex);
180 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
181 "%p: threadstart finishing: state is %u\n",
182 thr, ThrSTATE(thr)));
183 switch (ThrSTATE(thr)) {
184 case THRf_R_JOINABLE:
185 ThrSETSTATE(thr, THRf_ZOMBIE);
186 MUTEX_UNLOCK(&thr->mutex);
187 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
188 "%p: R_JOINABLE thread finished\n", thr));
191 ThrSETSTATE(thr, THRf_DEAD);
192 MUTEX_UNLOCK(&thr->mutex);
194 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
195 "%p: R_JOINED thread finished\n", thr));
197 case THRf_R_DETACHED:
198 ThrSETSTATE(thr, THRf_DEAD);
199 MUTEX_UNLOCK(&thr->mutex);
201 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
202 "%p: DETACHED thread finished\n", thr));
203 remove_thread(thr); /* This might trigger main thread to finish */
206 MUTEX_UNLOCK(&thr->mutex);
207 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
210 return THREAD_RET_CAST(av); /* Available for anyone to join with */
211 /* us unless we're detached, in which */
212 /* case noone sees the value anyway. */
215 return THREAD_RET_CAST(NULL);
220 newthread (SV *startsv, AV *initargs, char *classname)
228 #ifndef THREAD_CREATE
229 static pthread_attr_t attr;
230 static int attr_inited = 0;
231 sigset_t fullmask, oldmask;
235 thr = new_struct_thread(thr);
237 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
238 "%p: newthread (%p), tid is %u, preparing stack\n",
239 savethread, thr, thr->tid));
240 /* The following pushes the arg list and startsv onto the *new* stack */
242 /* Could easily speed up the following greatly */
243 for (i = 0; i <= AvFILL(initargs); i++)
244 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
245 XPUSHs(SvREFCNT_inc(startsv));
248 err = THREAD_CREATE(thr, threadstart);
250 /* On your marks... */
251 MUTEX_LOCK(&thr->mutex);
253 sigfillset(&fullmask);
254 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
255 croak("panic: sigprocmask");
259 err = pthread_attr_init(&attr);
261 err = pthread_attr_setdetachstate(&attr, ATTR_JOINABLE);
264 err = pthread_create(&thr->self, &attr, threadstart, (void*) thr);
266 MUTEX_UNLOCK(&thr->mutex);
269 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
270 "%p: create of %p failed %d\n",
271 savethread, thr, err));
272 /* Thread creation failed--clean up */
273 SvREFCNT_dec(thr->cvcache);
275 MUTEX_DESTROY(&thr->mutex);
276 for (i = 0; i <= AvFILL(initargs); i++)
277 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
278 SvREFCNT_dec(startsv);
281 #ifdef THREAD_POST_CREATE
282 THREAD_POST_CREATE(thr);
284 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
285 croak("panic: sigprocmask");
287 sv = newSViv(thr->tid);
288 sv_magic(sv, thr->oursv, '~', 0, 0);
289 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
290 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
292 croak("No threads in this perl");
297 static Signal_t handle_thread_signal _((int sig));
300 handle_thread_signal(int sig)
302 unsigned char c = (unsigned char) sig;
304 * We're not really allowed to call fprintf in a signal handler
305 * so don't be surprised if this isn't robust while debugging
308 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
309 "handle_thread_signal: got signal %d\n", sig););
310 write(sig_pipe[1], &c, 1);
313 MODULE = Thread PACKAGE = Thread
317 new(classname, startsv, ...)
320 AV * av = av_make(items - 2, &ST(2));
322 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
331 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
332 thr, t, ThrSTATE(t)););
333 MUTEX_LOCK(&t->mutex);
334 switch (ThrSTATE(t)) {
335 case THRf_R_JOINABLE:
337 ThrSETSTATE(t, THRf_R_JOINED);
338 MUTEX_UNLOCK(&t->mutex);
341 ThrSETSTATE(t, THRf_DEAD);
342 MUTEX_UNLOCK(&t->mutex);
346 MUTEX_UNLOCK(&t->mutex);
347 croak("can't join with thread");
352 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
353 /* Could easily speed up the following if necessary */
354 for (i = 1; i <= AvFILL(av); i++)
355 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
357 char *mess = SvPV(*av_fetch(av, 1, FALSE), na);
358 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
359 "%p: join propagating die message: %s\n",
370 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
371 thr, t, ThrSTATE(t)););
372 MUTEX_LOCK(&t->mutex);
373 switch (ThrSTATE(t)) {
374 case THRf_R_JOINABLE:
375 ThrSETSTATE(t, THRf_R_DETACHED);
377 case THRf_R_DETACHED:
379 MUTEX_UNLOCK(&t->mutex);
382 ThrSETSTATE(t, THRf_DEAD);
384 MUTEX_UNLOCK(&t->mutex);
388 MUTEX_UNLOCK(&t->mutex);
389 croak("can't detach thread");
399 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
406 PUSHs(sv_2mortal(newSViv(t->flags)));
416 sv = newSViv(thr->tid);
417 sv_magic(sv, thr->oursv, '~', 0, 0);
418 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
419 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
420 gv_stashpv(classname, TRUE))));
428 MUTEX_LOCK(&t->mutex);
430 MUTEX_UNLOCK(&t->mutex);
461 mg = condpair_magic(sv);
462 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
463 MUTEX_LOCK(MgMUTEXP(mg));
464 if (MgOWNER(mg) != thr) {
465 MUTEX_UNLOCK(MgMUTEXP(mg));
466 croak("cond_wait for lock that we don't own\n");
469 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
471 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
473 MUTEX_UNLOCK(MgMUTEXP(mg));
485 mg = condpair_magic(sv);
486 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
487 MUTEX_LOCK(MgMUTEXP(mg));
488 if (MgOWNER(mg) != thr) {
489 MUTEX_UNLOCK(MgMUTEXP(mg));
490 croak("cond_signal for lock that we don't own\n");
492 COND_SIGNAL(MgCONDP(mg));
493 MUTEX_UNLOCK(MgMUTEXP(mg));
505 mg = condpair_magic(sv);
506 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
508 MUTEX_LOCK(MgMUTEXP(mg));
509 if (MgOWNER(mg) != thr) {
510 MUTEX_UNLOCK(MgMUTEXP(mg));
511 croak("cond_broadcast for lock that we don't own\n");
513 COND_BROADCAST(MgCONDP(mg));
514 MUTEX_UNLOCK(MgMUTEXP(mg));
529 * Iterate until we have enough dynamic storage for all threads.
530 * We mustn't do any allocation while holding threads_mutex though.
532 MUTEX_LOCK(&PL_threads_mutex);
535 MUTEX_UNLOCK(&PL_threads_mutex);
536 if (AvFILL(av) < n - 1) {
538 for (i = AvFILL(av); i < n - 1; i++) {
539 SV *sv = newSViv(0); /* fill in tid later */
540 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
541 av_push(av, sv_bless(newRV_noinc(sv),
542 gv_stashpv(classname, TRUE)));
546 MUTEX_LOCK(&PL_threads_mutex);
547 } while (n < PL_nthreads);
548 n = PL_nthreads; /* Get the final correct value */
551 * At this point, there's enough room to fill in av.
552 * Note that we are holding threads_mutex so the list
553 * won't change out from under us but all the remaining
554 * processing is "fast" (no blocking, malloc etc.)
559 SV *sv = (SV*)SvRV(*svp);
560 sv_setiv(sv, t->tid);
561 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
562 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
563 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
568 MUTEX_UNLOCK(&PL_threads_mutex);
569 /* Truncate any unneeded slots in av */
571 /* Finally, push all the new objects onto the stack and drop av */
573 for (svp = AvARRAY(av); n > 0; n--, svp++)
575 (void)sv_2mortal((SV*)av);
579 MODULE = Thread PACKAGE = Thread::Signal
582 kill_sighandler_thread()
584 write(sig_pipe[1], "\0", 1);
588 init_thread_signals()
590 PL_sighandlerp = handle_thread_signal;
591 if (pipe(sig_pipe) == -1)
602 ret = read(sig_pipe[0], &c, 1);
603 } while (ret == -1 && errno == EINTR);
605 croak("panic: await_signal");
606 ST(0) = sv_newmortal();
608 sv_setsv(ST(0), c ? psig_ptr[c] : &sv_no);
609 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
610 "await_signal returning %s\n", SvPEEK(ST(0))););
612 MODULE = Thread PACKAGE = Thread::Specific
615 data(classname = "Thread::Specific")
619 if (AvFILL(thr->specific) == -1) {
620 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
621 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
623 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));