5 /* Magic signature for Thread's mg_private is "Th" */
6 #define Thread_MAGIC_SIGNATURE 0x5468
15 static U32 threadnum = 0;
16 static int sig_pipe[2];
18 #ifndef THREAD_RET_TYPE
19 typedef struct perl_thread *Thread;
20 #define THREAD_RET_TYPE void *
21 #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
25 remove_thread(struct perl_thread *t)
28 DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
29 "%p: remove_thread %p\n", thr, t)));
30 MUTEX_LOCK(&threads_mutex);
31 MUTEX_DESTROY(&t->mutex);
33 t->prev->next = t->next;
34 t->next->prev = t->prev;
35 COND_BROADCAST(&nthreads_cond);
36 MUTEX_UNLOCK(&threads_mutex);
40 static THREAD_RET_TYPE
41 threadstart(void *arg)
45 Thread savethread = thr;
48 I32 oldscope = scopestack_ix;
53 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
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;
64 /* Now duplicate most of perl_call_sv but with a few twists */
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 op = pp_entersub(ARGS);
73 PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
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.
80 thr = savethread; /* back to the old thread */
83 Thread thr = (Thread) arg;
86 I32 oldmark = TOPMARK;
87 I32 oldscope = scopestack_ix;
93 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
96 /* Don't call *anything* requiring dTHR until after SET_THR() */
98 * Wait until our creator releases us. If we didn't do this, then
99 * it would be potentially possible for out thread to carry on and
100 * do stuff before our creator fills in our "self" field. For example,
101 * if we went and created another thread which tried to JOIN with us,
102 * then we'd be in a mess.
104 MUTEX_LOCK(&thr->mutex);
105 MUTEX_UNLOCK(&thr->mutex);
108 * It's safe to wait until now to set the thread-specific pointer
109 * from our pthread_t structure to our struct perl_thread, since
110 * we're the only thread who can get at it anyway.
114 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
115 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
120 perl_call_sv(sv, G_ARRAY|G_EVAL);
122 retval = sp - (stack_base + oldmark);
123 sp = stack_base + oldmark + 1;
124 if (SvCUR(thr->errsv)) {
125 MUTEX_LOCK(&thr->mutex);
126 thr->flags |= THRf_DID_DIE;
127 MUTEX_UNLOCK(&thr->mutex);
128 av_store(av, 0, &sv_no);
129 av_store(av, 1, newSVsv(thr->errsv));
130 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p died: %s\n",
131 SvPV(thr->errsv, na));
134 for (i = 1; i <= retval; i++) {
135 PerlIO_printf(PerlIO_stderr(), "%p return[%d] = %s\n",
136 thr, i, SvPEEK(sp[i - 1]));)
139 av_store(av, 0, &sv_yes);
140 for (i = 1; i <= retval; i++, sp++)
141 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*sp));
146 /* removed for debug */
147 SvREFCNT_dec(curstack);
149 SvREFCNT_dec(thr->cvcache);
150 SvREFCNT_dec(thr->threadsv);
151 SvREFCNT_dec(thr->specific);
152 SvREFCNT_dec(thr->errsv);
153 SvREFCNT_dec(thr->errhv);
155 Safefree(scopestack);
159 Safefree(tmps_stack);
162 MUTEX_LOCK(&thr->mutex);
163 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
164 "%p: threadstart finishing: state is %u\n",
165 thr, ThrSTATE(thr)));
166 switch (ThrSTATE(thr)) {
167 case THRf_R_JOINABLE:
168 ThrSETSTATE(thr, THRf_ZOMBIE);
169 MUTEX_UNLOCK(&thr->mutex);
170 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
171 "%p: R_JOINABLE thread finished\n", thr));
174 ThrSETSTATE(thr, THRf_DEAD);
175 MUTEX_UNLOCK(&thr->mutex);
177 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
178 "%p: R_JOINED thread finished\n", thr));
180 case THRf_R_DETACHED:
181 ThrSETSTATE(thr, THRf_DEAD);
182 MUTEX_UNLOCK(&thr->mutex);
184 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
185 "%p: DETACHED thread finished\n", thr));
186 remove_thread(thr); /* This might trigger main thread to finish */
189 MUTEX_UNLOCK(&thr->mutex);
190 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
193 return THREAD_RET_CAST(av); /* Available for anyone to join with */
194 /* us unless we're detached, in which */
195 /* case noone sees the value anyway. */
198 return THREAD_RET_CAST(NULL);
203 newthread (SV *startsv, AV *initargs, char *classname)
211 #ifndef THREAD_CREATE
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");
237 #ifdef PTHREADS_CREATED_JOINABLE
238 err = pthread_create(&thr->self, pthread_attr_default,
239 threadstart, (void*) thr);
244 err = pthread_attr_init(&attr);
246 #ifdef PTHREAD_CREATE_UNDETACHED
247 err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_UNDETACHED);
249 croak("panic: pthread_attr_setdetachstate");
252 err = pthread_create(&thr->self, &attr,
253 threadstart, (void*) thr);
255 pthread_attr_destroy(&attr);
259 MUTEX_UNLOCK(&thr->mutex);
262 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
263 "%p: create of %p failed %d\n", savethread, thr, err));
264 /* Thread creation failed--clean up */
265 SvREFCNT_dec(thr->cvcache);
267 MUTEX_DESTROY(&thr->mutex);
268 for (i = 0; i <= AvFILL(initargs); i++)
269 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
270 SvREFCNT_dec(startsv);
273 #ifdef THREAD_POST_CREATE
274 THREAD_POST_CREATE(thr);
276 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
277 croak("panic: sigprocmask");
279 sv = newSViv(thr->tid);
280 sv_magic(sv, thr->oursv, '~', 0, 0);
281 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
282 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
284 croak("No threads in this perl");
289 static Signal_t handle_thread_signal _((int sig));
292 handle_thread_signal(int sig)
295 write(sig_pipe[0], &c, 1);
298 MODULE = Thread PACKAGE = Thread
302 new(classname, startsv, ...)
305 AV * av = av_make(items - 2, &ST(2));
307 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
316 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
317 thr, t, ThrSTATE(t)););
318 MUTEX_LOCK(&t->mutex);
319 switch (ThrSTATE(t)) {
320 case THRf_R_JOINABLE:
322 ThrSETSTATE(t, THRf_R_JOINED);
323 MUTEX_UNLOCK(&t->mutex);
326 ThrSETSTATE(t, THRf_DEAD);
327 MUTEX_UNLOCK(&t->mutex);
331 MUTEX_UNLOCK(&t->mutex);
332 croak("can't join with thread");
337 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
338 /* Could easily speed up the following if necessary */
339 for (i = 1; i <= AvFILL(av); i++)
340 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
342 char *mess = SvPV(*av_fetch(av, 1, FALSE), na);
343 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
344 "%p: join propagating die message: %s\n",
355 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
356 thr, t, ThrSTATE(t)););
357 MUTEX_LOCK(&t->mutex);
358 switch (ThrSTATE(t)) {
359 case THRf_R_JOINABLE:
360 ThrSETSTATE(t, THRf_R_DETACHED);
362 case THRf_R_DETACHED:
364 MUTEX_UNLOCK(&t->mutex);
367 ThrSETSTATE(t, THRf_DEAD);
369 MUTEX_UNLOCK(&t->mutex);
373 MUTEX_UNLOCK(&t->mutex);
374 croak("can't detach thread");
384 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
391 PUSHs(sv_2mortal(newSViv(t->flags)));
401 sv = newSViv(thr->tid);
402 sv_magic(sv, thr->oursv, '~', 0, 0);
403 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
404 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
405 gv_stashpv(classname, TRUE))));
413 MUTEX_LOCK(&t->mutex);
415 MUTEX_UNLOCK(&t->mutex);
446 mg = condpair_magic(sv);
447 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
448 MUTEX_LOCK(MgMUTEXP(mg));
449 if (MgOWNER(mg) != thr) {
450 MUTEX_UNLOCK(MgMUTEXP(mg));
451 croak("cond_wait for lock that we don't own\n");
454 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
456 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
458 MUTEX_UNLOCK(MgMUTEXP(mg));
470 mg = condpair_magic(sv);
471 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
472 MUTEX_LOCK(MgMUTEXP(mg));
473 if (MgOWNER(mg) != thr) {
474 MUTEX_UNLOCK(MgMUTEXP(mg));
475 croak("cond_signal for lock that we don't own\n");
477 COND_SIGNAL(MgCONDP(mg));
478 MUTEX_UNLOCK(MgMUTEXP(mg));
490 mg = condpair_magic(sv);
491 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
493 MUTEX_LOCK(MgMUTEXP(mg));
494 if (MgOWNER(mg) != thr) {
495 MUTEX_UNLOCK(MgMUTEXP(mg));
496 croak("cond_broadcast for lock that we don't own\n");
498 COND_BROADCAST(MgCONDP(mg));
499 MUTEX_UNLOCK(MgMUTEXP(mg));
514 * Iterate until we have enough dynamic storage for all threads.
515 * We mustn't do any allocation while holding threads_mutex though.
517 MUTEX_LOCK(&threads_mutex);
520 MUTEX_UNLOCK(&threads_mutex);
521 if (AvFILL(av) < n - 1) {
523 for (i = AvFILL(av); i < n - 1; i++) {
524 SV *sv = newSViv(0); /* fill in tid later */
525 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
526 av_push(av, sv_bless(newRV_noinc(sv),
527 gv_stashpv(classname, TRUE)));
531 MUTEX_LOCK(&threads_mutex);
532 } while (n < nthreads);
533 n = nthreads; /* Get the final correct value */
536 * At this point, there's enough room to fill in av.
537 * Note that we are holding threads_mutex so the list
538 * won't change out from under us but all the remaining
539 * processing is "fast" (no blocking, malloc etc.)
544 SV *sv = (SV*)SvRV(*svp);
545 sv_setiv(sv, t->tid);
546 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
547 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
548 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
553 MUTEX_UNLOCK(&threads_mutex);
554 /* Truncate any unneeded slots in av */
556 /* Finally, push all the new objects onto the stack and drop av */
558 for (svp = AvARRAY(av); n > 0; n--, svp++)
560 (void)sv_2mortal((SV*)av);
564 MODULE = Thread PACKAGE = Thread::Signal
567 kill_sighandler_thread()
569 write(sig_pipe[0], "\0", 1);
573 init_thread_signals()
575 sighandlerp = handle_thread_signal;
576 if (pipe(sig_pipe) == -1)
587 ret = read(sig_pipe[1], &c, 1);
588 } while (ret == -1 && errno == EINTR);
590 croak("panic: await_signal");
593 RETVAL = c ? psig_ptr[c] : &sv_no;
597 MODULE = Thread PACKAGE = Thread::Specific
600 data(classname = "Thread::Specific")
604 if (AvFILL(thr->specific) == -1) {
605 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
606 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
608 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));