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_S(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 = PL_scopestack_ix;
51 DEBUG_S(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 */
64 Zero(PL_op, 1, LOGOP);
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 PL_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_S(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_S(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
120 perl_call_sv(sv, G_ARRAY|G_EVAL);
122 retval = SP - (PL_stack_base + oldmark);
123 SP = PL_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, &PL_sv_no);
129 av_store(av, 1, newSVsv(thr->errsv));
130 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p died: %s\n",
131 thr, SvPV(thr->errsv, PL_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, &PL_sv_yes);
140 for (i = 1; i <= retval; i++, SP++)
141 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
148 /* removed for debug */
149 SvREFCNT_dec(PL_curstack);
151 SvREFCNT_dec(thr->cvcache);
152 SvREFCNT_dec(thr->threadsv);
153 SvREFCNT_dec(thr->specific);
154 SvREFCNT_dec(thr->errsv);
155 SvREFCNT_dec(thr->errhv);
157 /*Safefree(cxstack);*/
158 while (PL_curstackinfo->si_next)
159 PL_curstackinfo = PL_curstackinfo->si_next;
160 while (PL_curstackinfo) {
161 PERL_SI *p = PL_curstackinfo->si_prev;
162 SvREFCNT_dec(PL_curstackinfo->si_stack);
163 Safefree(PL_curstackinfo->si_cxstack);
164 Safefree(PL_curstackinfo);
167 Safefree(PL_markstack);
168 Safefree(PL_scopestack);
169 Safefree(PL_savestack);
170 Safefree(PL_retstack);
171 Safefree(PL_tmps_stack);
175 SvREFCNT_dec(PL_nrs);
176 SvREFCNT_dec(PL_statname);
177 Safefree(PL_screamfirst);
178 Safefree(PL_screamnext);
179 Safefree(PL_reg_start_tmp);
180 SvREFCNT_dec(PL_lastscream);
181 SvREFCNT_dec(PL_defoutgv);
183 MUTEX_LOCK(&thr->mutex);
184 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
185 "%p: threadstart finishing: state is %u\n",
186 thr, ThrSTATE(thr)));
187 switch (ThrSTATE(thr)) {
188 case THRf_R_JOINABLE:
189 ThrSETSTATE(thr, THRf_ZOMBIE);
190 MUTEX_UNLOCK(&thr->mutex);
191 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
192 "%p: R_JOINABLE thread finished\n", thr));
195 ThrSETSTATE(thr, THRf_DEAD);
196 MUTEX_UNLOCK(&thr->mutex);
198 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
199 "%p: R_JOINED thread finished\n", thr));
201 case THRf_R_DETACHED:
202 ThrSETSTATE(thr, THRf_DEAD);
203 MUTEX_UNLOCK(&thr->mutex);
205 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
206 "%p: DETACHED thread finished\n", thr));
207 remove_thread(thr); /* This might trigger main thread to finish */
210 MUTEX_UNLOCK(&thr->mutex);
211 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
214 return THREAD_RET_CAST(av); /* Available for anyone to join with */
215 /* us unless we're detached, in which */
216 /* case noone sees the value anyway. */
219 return THREAD_RET_CAST(NULL);
224 newthread (SV *startsv, AV *initargs, char *classname)
232 #ifndef THREAD_CREATE
233 static pthread_attr_t attr;
234 static int attr_inited = 0;
235 sigset_t fullmask, oldmask;
236 static int attr_joinable = PTHREAD_CREATE_JOINABLE;
240 thr = new_struct_thread(thr);
242 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
243 "%p: newthread (%p), tid is %u, preparing stack\n",
244 savethread, thr, thr->tid));
245 /* The following pushes the arg list and startsv onto the *new* stack */
247 /* Could easily speed up the following greatly */
248 for (i = 0; i <= AvFILL(initargs); i++)
249 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
250 XPUSHs(SvREFCNT_inc(startsv));
253 err = THREAD_CREATE(thr, threadstart);
255 /* On your marks... */
256 MUTEX_LOCK(&thr->mutex);
258 sigfillset(&fullmask);
259 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
260 croak("panic: sigprocmask");
264 err = pthread_attr_init(&attr);
265 # ifdef PTHREAD_ATTR_SETDETACHSTATE
267 err = PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
270 croak("panic: can't pthread_attr_setdetachstate");
274 err = PTHREAD_CREATE(&thr->self, attr, threadstart, (void*) thr);
276 MUTEX_UNLOCK(&thr->mutex);
279 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
280 "%p: create of %p failed %d\n",
281 savethread, thr, err));
282 /* Thread creation failed--clean up */
283 SvREFCNT_dec(thr->cvcache);
285 MUTEX_DESTROY(&thr->mutex);
286 for (i = 0; i <= AvFILL(initargs); i++)
287 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
288 SvREFCNT_dec(startsv);
291 #ifdef THREAD_POST_CREATE
292 THREAD_POST_CREATE(thr);
294 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
295 croak("panic: sigprocmask");
297 sv = newSViv(thr->tid);
298 sv_magic(sv, thr->oursv, '~', 0, 0);
299 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
300 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
302 croak("No threads in this perl");
307 static Signal_t handle_thread_signal _((int sig));
310 handle_thread_signal(int sig)
312 unsigned char c = (unsigned char) sig;
314 * We're not really allowed to call fprintf in a signal handler
315 * so don't be surprised if this isn't robust while debugging
318 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
319 "handle_thread_signal: got signal %d\n", sig););
320 write(sig_pipe[1], &c, 1);
323 MODULE = Thread PACKAGE = Thread
327 new(classname, startsv, ...)
330 AV * av = av_make(items - 2, &ST(2));
332 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
341 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
342 thr, t, ThrSTATE(t)););
343 MUTEX_LOCK(&t->mutex);
344 switch (ThrSTATE(t)) {
345 case THRf_R_JOINABLE:
347 ThrSETSTATE(t, THRf_R_JOINED);
348 MUTEX_UNLOCK(&t->mutex);
351 ThrSETSTATE(t, THRf_DEAD);
352 MUTEX_UNLOCK(&t->mutex);
356 MUTEX_UNLOCK(&t->mutex);
357 croak("can't join with thread");
362 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
363 /* Could easily speed up the following if necessary */
364 for (i = 1; i <= AvFILL(av); i++)
365 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
367 char *mess = SvPV(*av_fetch(av, 1, FALSE), PL_na);
368 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
369 "%p: join propagating die message: %s\n",
380 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
381 thr, t, ThrSTATE(t)););
382 MUTEX_LOCK(&t->mutex);
383 switch (ThrSTATE(t)) {
384 case THRf_R_JOINABLE:
385 ThrSETSTATE(t, THRf_R_DETACHED);
387 case THRf_R_DETACHED:
389 MUTEX_UNLOCK(&t->mutex);
392 ThrSETSTATE(t, THRf_DEAD);
394 MUTEX_UNLOCK(&t->mutex);
398 MUTEX_UNLOCK(&t->mutex);
399 croak("can't detach thread");
409 PUSHs((t1 == t2) ? &PL_sv_yes : &PL_sv_no);
416 PUSHs(sv_2mortal(newSViv(t->flags)));
426 sv = newSViv(thr->tid);
427 sv_magic(sv, thr->oursv, '~', 0, 0);
428 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
429 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
430 gv_stashpv(classname, TRUE))));
438 MUTEX_LOCK(&t->mutex);
440 MUTEX_UNLOCK(&t->mutex);
471 mg = condpair_magic(sv);
472 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
473 MUTEX_LOCK(MgMUTEXP(mg));
474 if (MgOWNER(mg) != thr) {
475 MUTEX_UNLOCK(MgMUTEXP(mg));
476 croak("cond_wait for lock that we don't own\n");
479 COND_SIGNAL(MgOWNERCONDP(mg));
480 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
482 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
484 MUTEX_UNLOCK(MgMUTEXP(mg));
496 mg = condpair_magic(sv);
497 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
498 MUTEX_LOCK(MgMUTEXP(mg));
499 if (MgOWNER(mg) != thr) {
500 MUTEX_UNLOCK(MgMUTEXP(mg));
501 croak("cond_signal for lock that we don't own\n");
503 COND_SIGNAL(MgCONDP(mg));
504 MUTEX_UNLOCK(MgMUTEXP(mg));
516 mg = condpair_magic(sv);
517 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
519 MUTEX_LOCK(MgMUTEXP(mg));
520 if (MgOWNER(mg) != thr) {
521 MUTEX_UNLOCK(MgMUTEXP(mg));
522 croak("cond_broadcast for lock that we don't own\n");
524 COND_BROADCAST(MgCONDP(mg));
525 MUTEX_UNLOCK(MgMUTEXP(mg));
540 * Iterate until we have enough dynamic storage for all threads.
541 * We mustn't do any allocation while holding threads_mutex though.
543 MUTEX_LOCK(&PL_threads_mutex);
546 MUTEX_UNLOCK(&PL_threads_mutex);
547 if (AvFILL(av) < n - 1) {
549 for (i = AvFILL(av); i < n - 1; i++) {
550 SV *sv = newSViv(0); /* fill in tid later */
551 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
552 av_push(av, sv_bless(newRV_noinc(sv),
553 gv_stashpv(classname, TRUE)));
557 MUTEX_LOCK(&PL_threads_mutex);
558 } while (n < PL_nthreads);
559 n = PL_nthreads; /* Get the final correct value */
562 * At this point, there's enough room to fill in av.
563 * Note that we are holding threads_mutex so the list
564 * won't change out from under us but all the remaining
565 * processing is "fast" (no blocking, malloc etc.)
570 SV *sv = (SV*)SvRV(*svp);
571 sv_setiv(sv, t->tid);
572 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
573 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
574 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
579 MUTEX_UNLOCK(&PL_threads_mutex);
580 /* Truncate any unneeded slots in av */
582 /* Finally, push all the new objects onto the stack and drop av */
584 for (svp = AvARRAY(av); n > 0; n--, svp++)
586 (void)sv_2mortal((SV*)av);
590 MODULE = Thread PACKAGE = Thread::Signal
593 kill_sighandler_thread()
595 write(sig_pipe[1], "\0", 1);
599 init_thread_signals()
601 PL_sighandlerp = handle_thread_signal;
602 if (pipe(sig_pipe) == -1)
613 ret = read(sig_pipe[0], &c, 1);
614 } while (ret == -1 && errno == EINTR);
616 croak("panic: await_signal");
617 ST(0) = sv_newmortal();
619 sv_setsv(ST(0), c ? PL_psig_ptr[c] : &PL_sv_no);
620 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
621 "await_signal returning %s\n", SvPEEK(ST(0))););
623 MODULE = Thread PACKAGE = Thread::Specific
626 data(classname = "Thread::Specific")
630 if (AvFILL(thr->specific) == -1) {
631 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
632 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
634 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));