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(&threads_mutex);
29 MUTEX_DESTROY(&t->mutex);
31 t->prev->next = t->next;
32 t->next->prev = t->prev;
33 COND_BROADCAST(&nthreads_cond);
34 MUTEX_UNLOCK(&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 = 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 - (stack_base + oldmark);
121 SP = 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);
154 Safefree(scopestack);
158 Safefree(tmps_stack);
163 SvREFCNT_dec(statname);
164 Safefree(screamfirst);
165 Safefree(screamnext);
166 Safefree(reg_start_tmp);
167 SvREFCNT_dec(lastscream);
169 MUTEX_LOCK(&thr->mutex);
170 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
171 "%p: threadstart finishing: state is %u\n",
172 thr, ThrSTATE(thr)));
173 switch (ThrSTATE(thr)) {
174 case THRf_R_JOINABLE:
175 ThrSETSTATE(thr, THRf_ZOMBIE);
176 MUTEX_UNLOCK(&thr->mutex);
177 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
178 "%p: R_JOINABLE thread finished\n", thr));
181 ThrSETSTATE(thr, THRf_DEAD);
182 MUTEX_UNLOCK(&thr->mutex);
184 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
185 "%p: R_JOINED thread finished\n", thr));
187 case THRf_R_DETACHED:
188 ThrSETSTATE(thr, THRf_DEAD);
189 MUTEX_UNLOCK(&thr->mutex);
191 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
192 "%p: DETACHED thread finished\n", thr));
193 remove_thread(thr); /* This might trigger main thread to finish */
196 MUTEX_UNLOCK(&thr->mutex);
197 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
200 return THREAD_RET_CAST(av); /* Available for anyone to join with */
201 /* us unless we're detached, in which */
202 /* case noone sees the value anyway. */
205 return THREAD_RET_CAST(NULL);
210 newthread (SV *startsv, AV *initargs, char *classname)
218 #ifndef THREAD_CREATE
219 static pthread_attr_t attr;
220 static int attr_inited = 0;
221 sigset_t fullmask, oldmask;
225 thr = new_struct_thread(thr);
227 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
228 "%p: newthread (%p), tid is %u, preparing stack\n",
229 savethread, thr, thr->tid));
230 /* The following pushes the arg list and startsv onto the *new* stack */
232 /* Could easily speed up the following greatly */
233 for (i = 0; i <= AvFILL(initargs); i++)
234 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
235 XPUSHs(SvREFCNT_inc(startsv));
238 err = THREAD_CREATE(thr, threadstart);
240 /* On your marks... */
241 MUTEX_LOCK(&thr->mutex);
243 sigfillset(&fullmask);
244 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
245 croak("panic: sigprocmask");
249 err = pthread_attr_init(&attr);
251 err = pthread_attr_setdetachstate(&attr, ATTR_JOINABLE);
254 err = pthread_create(&thr->self, &attr, threadstart, (void*) thr);
256 MUTEX_UNLOCK(&thr->mutex);
259 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
260 "%p: create of %p failed %d\n",
261 savethread, thr, err));
262 /* Thread creation failed--clean up */
263 SvREFCNT_dec(thr->cvcache);
265 MUTEX_DESTROY(&thr->mutex);
266 for (i = 0; i <= AvFILL(initargs); i++)
267 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
268 SvREFCNT_dec(startsv);
271 #ifdef THREAD_POST_CREATE
272 THREAD_POST_CREATE(thr);
274 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
275 croak("panic: sigprocmask");
277 sv = newSViv(thr->tid);
278 sv_magic(sv, thr->oursv, '~', 0, 0);
279 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
280 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
282 croak("No threads in this perl");
287 static Signal_t handle_thread_signal _((int sig));
290 handle_thread_signal(int sig)
292 unsigned char c = (unsigned char) sig;
294 * We're not really allowed to call fprintf in a signal handler
295 * so don't be surprised if this isn't robust while debugging
298 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
299 "handle_thread_signal: got signal %d\n", sig););
300 write(sig_pipe[1], &c, 1);
303 MODULE = Thread PACKAGE = Thread
307 new(classname, startsv, ...)
310 AV * av = av_make(items - 2, &ST(2));
312 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
321 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
322 thr, t, ThrSTATE(t)););
323 MUTEX_LOCK(&t->mutex);
324 switch (ThrSTATE(t)) {
325 case THRf_R_JOINABLE:
327 ThrSETSTATE(t, THRf_R_JOINED);
328 MUTEX_UNLOCK(&t->mutex);
331 ThrSETSTATE(t, THRf_DEAD);
332 MUTEX_UNLOCK(&t->mutex);
336 MUTEX_UNLOCK(&t->mutex);
337 croak("can't join with thread");
342 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
343 /* Could easily speed up the following if necessary */
344 for (i = 1; i <= AvFILL(av); i++)
345 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
347 char *mess = SvPV(*av_fetch(av, 1, FALSE), na);
348 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
349 "%p: join propagating die message: %s\n",
360 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
361 thr, t, ThrSTATE(t)););
362 MUTEX_LOCK(&t->mutex);
363 switch (ThrSTATE(t)) {
364 case THRf_R_JOINABLE:
365 ThrSETSTATE(t, THRf_R_DETACHED);
367 case THRf_R_DETACHED:
369 MUTEX_UNLOCK(&t->mutex);
372 ThrSETSTATE(t, THRf_DEAD);
374 MUTEX_UNLOCK(&t->mutex);
378 MUTEX_UNLOCK(&t->mutex);
379 croak("can't detach thread");
389 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
396 PUSHs(sv_2mortal(newSViv(t->flags)));
406 sv = newSViv(thr->tid);
407 sv_magic(sv, thr->oursv, '~', 0, 0);
408 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
409 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
410 gv_stashpv(classname, TRUE))));
418 MUTEX_LOCK(&t->mutex);
420 MUTEX_UNLOCK(&t->mutex);
451 mg = condpair_magic(sv);
452 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
453 MUTEX_LOCK(MgMUTEXP(mg));
454 if (MgOWNER(mg) != thr) {
455 MUTEX_UNLOCK(MgMUTEXP(mg));
456 croak("cond_wait for lock that we don't own\n");
459 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
461 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
463 MUTEX_UNLOCK(MgMUTEXP(mg));
475 mg = condpair_magic(sv);
476 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
477 MUTEX_LOCK(MgMUTEXP(mg));
478 if (MgOWNER(mg) != thr) {
479 MUTEX_UNLOCK(MgMUTEXP(mg));
480 croak("cond_signal for lock that we don't own\n");
482 COND_SIGNAL(MgCONDP(mg));
483 MUTEX_UNLOCK(MgMUTEXP(mg));
495 mg = condpair_magic(sv);
496 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
498 MUTEX_LOCK(MgMUTEXP(mg));
499 if (MgOWNER(mg) != thr) {
500 MUTEX_UNLOCK(MgMUTEXP(mg));
501 croak("cond_broadcast for lock that we don't own\n");
503 COND_BROADCAST(MgCONDP(mg));
504 MUTEX_UNLOCK(MgMUTEXP(mg));
519 * Iterate until we have enough dynamic storage for all threads.
520 * We mustn't do any allocation while holding threads_mutex though.
522 MUTEX_LOCK(&threads_mutex);
525 MUTEX_UNLOCK(&threads_mutex);
526 if (AvFILL(av) < n - 1) {
528 for (i = AvFILL(av); i < n - 1; i++) {
529 SV *sv = newSViv(0); /* fill in tid later */
530 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
531 av_push(av, sv_bless(newRV_noinc(sv),
532 gv_stashpv(classname, TRUE)));
536 MUTEX_LOCK(&threads_mutex);
537 } while (n < nthreads);
538 n = nthreads; /* Get the final correct value */
541 * At this point, there's enough room to fill in av.
542 * Note that we are holding threads_mutex so the list
543 * won't change out from under us but all the remaining
544 * processing is "fast" (no blocking, malloc etc.)
549 SV *sv = (SV*)SvRV(*svp);
550 sv_setiv(sv, t->tid);
551 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
552 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
553 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
558 MUTEX_UNLOCK(&threads_mutex);
559 /* Truncate any unneeded slots in av */
561 /* Finally, push all the new objects onto the stack and drop av */
563 for (svp = AvARRAY(av); n > 0; n--, svp++)
565 (void)sv_2mortal((SV*)av);
569 MODULE = Thread PACKAGE = Thread::Signal
572 kill_sighandler_thread()
574 write(sig_pipe[1], "\0", 1);
578 init_thread_signals()
580 sighandlerp = handle_thread_signal;
581 if (pipe(sig_pipe) == -1)
592 ret = read(sig_pipe[0], &c, 1);
593 } while (ret == -1 && errno == EINTR);
595 croak("panic: await_signal");
596 ST(0) = sv_newmortal();
598 sv_setsv(ST(0), c ? psig_ptr[c] : &sv_no);
599 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
600 "await_signal returning %s\n", SvPEEK(ST(0))););
602 MODULE = Thread PACKAGE = Thread::Specific
605 data(classname = "Thread::Specific")
609 if (AvFILL(thr->specific) == -1) {
610 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
611 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
613 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));