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);
153 Safefree(scopestack);
157 Safefree(tmps_stack);
160 MUTEX_LOCK(&thr->mutex);
161 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
162 "%p: threadstart finishing: state is %u\n",
163 thr, ThrSTATE(thr)));
164 switch (ThrSTATE(thr)) {
165 case THRf_R_JOINABLE:
166 ThrSETSTATE(thr, THRf_ZOMBIE);
167 MUTEX_UNLOCK(&thr->mutex);
168 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
169 "%p: R_JOINABLE thread finished\n", thr));
172 ThrSETSTATE(thr, THRf_DEAD);
173 MUTEX_UNLOCK(&thr->mutex);
175 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
176 "%p: R_JOINED thread finished\n", thr));
178 case THRf_R_DETACHED:
179 ThrSETSTATE(thr, THRf_DEAD);
180 MUTEX_UNLOCK(&thr->mutex);
182 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
183 "%p: DETACHED thread finished\n", thr));
184 remove_thread(thr); /* This might trigger main thread to finish */
187 MUTEX_UNLOCK(&thr->mutex);
188 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
191 return THREAD_RET_CAST(av); /* Available for anyone to join with */
192 /* us unless we're detached, in which */
193 /* case noone sees the value anyway. */
196 return THREAD_RET_CAST(NULL);
201 newthread (SV *startsv, AV *initargs, char *classname)
209 #ifndef THREAD_CREATE
210 static pthread_attr_t attr;
211 static int attr_inited = 0;
212 sigset_t fullmask, oldmask;
216 thr = new_struct_thread(thr);
218 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
219 "%p: newthread (%p), tid is %u, preparing stack\n",
220 savethread, thr, thr->tid));
221 /* The following pushes the arg list and startsv onto the *new* stack */
223 /* Could easily speed up the following greatly */
224 for (i = 0; i <= AvFILL(initargs); i++)
225 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
226 XPUSHs(SvREFCNT_inc(startsv));
229 err = THREAD_CREATE(thr, threadstart);
231 /* On your marks... */
232 MUTEX_LOCK(&thr->mutex);
234 sigfillset(&fullmask);
235 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
236 croak("panic: sigprocmask");
240 err = pthread_attr_init(&attr);
242 err = pthread_attr_setdetachstate(&attr, ATTR_JOINABLE);
245 err = pthread_create(&thr->self, &attr, threadstart, (void*) thr);
247 MUTEX_UNLOCK(&thr->mutex);
250 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
251 "%p: create of %p failed %d\n",
252 savethread, thr, err));
253 /* Thread creation failed--clean up */
254 SvREFCNT_dec(thr->cvcache);
256 MUTEX_DESTROY(&thr->mutex);
257 for (i = 0; i <= AvFILL(initargs); i++)
258 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
259 SvREFCNT_dec(startsv);
262 #ifdef THREAD_POST_CREATE
263 THREAD_POST_CREATE(thr);
265 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
266 croak("panic: sigprocmask");
268 sv = newSViv(thr->tid);
269 sv_magic(sv, thr->oursv, '~', 0, 0);
270 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
271 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
273 croak("No threads in this perl");
278 static Signal_t handle_thread_signal _((int sig));
281 handle_thread_signal(int sig)
283 unsigned char c = (unsigned char) sig;
285 * We're not really allowed to call fprintf in a signal handler
286 * so don't be surprised if this isn't robust while debugging
289 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
290 "handle_thread_signal: got signal %d\n", sig););
291 write(sig_pipe[1], &c, 1);
294 MODULE = Thread PACKAGE = Thread
298 new(classname, startsv, ...)
301 AV * av = av_make(items - 2, &ST(2));
303 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
312 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
313 thr, t, ThrSTATE(t)););
314 MUTEX_LOCK(&t->mutex);
315 switch (ThrSTATE(t)) {
316 case THRf_R_JOINABLE:
318 ThrSETSTATE(t, THRf_R_JOINED);
319 MUTEX_UNLOCK(&t->mutex);
322 ThrSETSTATE(t, THRf_DEAD);
323 MUTEX_UNLOCK(&t->mutex);
327 MUTEX_UNLOCK(&t->mutex);
328 croak("can't join with thread");
333 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
334 /* Could easily speed up the following if necessary */
335 for (i = 1; i <= AvFILL(av); i++)
336 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
338 char *mess = SvPV(*av_fetch(av, 1, FALSE), na);
339 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
340 "%p: join propagating die message: %s\n",
351 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
352 thr, t, ThrSTATE(t)););
353 MUTEX_LOCK(&t->mutex);
354 switch (ThrSTATE(t)) {
355 case THRf_R_JOINABLE:
356 ThrSETSTATE(t, THRf_R_DETACHED);
358 case THRf_R_DETACHED:
360 MUTEX_UNLOCK(&t->mutex);
363 ThrSETSTATE(t, THRf_DEAD);
365 MUTEX_UNLOCK(&t->mutex);
369 MUTEX_UNLOCK(&t->mutex);
370 croak("can't detach thread");
380 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
387 PUSHs(sv_2mortal(newSViv(t->flags)));
397 sv = newSViv(thr->tid);
398 sv_magic(sv, thr->oursv, '~', 0, 0);
399 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
400 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
401 gv_stashpv(classname, TRUE))));
409 MUTEX_LOCK(&t->mutex);
411 MUTEX_UNLOCK(&t->mutex);
442 mg = condpair_magic(sv);
443 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
444 MUTEX_LOCK(MgMUTEXP(mg));
445 if (MgOWNER(mg) != thr) {
446 MUTEX_UNLOCK(MgMUTEXP(mg));
447 croak("cond_wait for lock that we don't own\n");
450 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
452 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
454 MUTEX_UNLOCK(MgMUTEXP(mg));
466 mg = condpair_magic(sv);
467 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
468 MUTEX_LOCK(MgMUTEXP(mg));
469 if (MgOWNER(mg) != thr) {
470 MUTEX_UNLOCK(MgMUTEXP(mg));
471 croak("cond_signal for lock that we don't own\n");
473 COND_SIGNAL(MgCONDP(mg));
474 MUTEX_UNLOCK(MgMUTEXP(mg));
486 mg = condpair_magic(sv);
487 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
489 MUTEX_LOCK(MgMUTEXP(mg));
490 if (MgOWNER(mg) != thr) {
491 MUTEX_UNLOCK(MgMUTEXP(mg));
492 croak("cond_broadcast for lock that we don't own\n");
494 COND_BROADCAST(MgCONDP(mg));
495 MUTEX_UNLOCK(MgMUTEXP(mg));
510 * Iterate until we have enough dynamic storage for all threads.
511 * We mustn't do any allocation while holding threads_mutex though.
513 MUTEX_LOCK(&threads_mutex);
516 MUTEX_UNLOCK(&threads_mutex);
517 if (AvFILL(av) < n - 1) {
519 for (i = AvFILL(av); i < n - 1; i++) {
520 SV *sv = newSViv(0); /* fill in tid later */
521 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
522 av_push(av, sv_bless(newRV_noinc(sv),
523 gv_stashpv(classname, TRUE)));
527 MUTEX_LOCK(&threads_mutex);
528 } while (n < nthreads);
529 n = nthreads; /* Get the final correct value */
532 * At this point, there's enough room to fill in av.
533 * Note that we are holding threads_mutex so the list
534 * won't change out from under us but all the remaining
535 * processing is "fast" (no blocking, malloc etc.)
540 SV *sv = (SV*)SvRV(*svp);
541 sv_setiv(sv, t->tid);
542 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
543 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
544 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
549 MUTEX_UNLOCK(&threads_mutex);
550 /* Truncate any unneeded slots in av */
552 /* Finally, push all the new objects onto the stack and drop av */
554 for (svp = AvARRAY(av); n > 0; n--, svp++)
556 (void)sv_2mortal((SV*)av);
560 MODULE = Thread PACKAGE = Thread::Signal
563 kill_sighandler_thread()
565 write(sig_pipe[1], "\0", 1);
569 init_thread_signals()
571 sighandlerp = handle_thread_signal;
572 if (pipe(sig_pipe) == -1)
583 ret = read(sig_pipe[0], &c, 1);
584 } while (ret == -1 && errno == EINTR);
586 croak("panic: await_signal");
587 ST(0) = sv_newmortal();
589 sv_setsv(ST(0), c ? psig_ptr[c] : &sv_no);
590 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
591 "await_signal returning %s\n", SvPEEK(ST(0))););
593 MODULE = Thread PACKAGE = Thread::Specific
596 data(classname = "Thread::Specific")
600 if (AvFILL(thr->specific) == -1) {
601 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
602 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
604 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));