5 /* Magic signature for Thread's mg_private is "Th" */
6 #define Thread_MAGIC_SIGNATURE 0x5468
8 static U32 threadnum = 0;
9 static int sig_pipe[2];
15 DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
16 "%p: remove_thread %p\n", thr, t)));
17 MUTEX_LOCK(&threads_mutex);
18 MUTEX_DESTROY(&t->mutex);
20 t->prev->next = t->next;
21 t->next->prev = t->prev;
22 COND_BROADCAST(&nthreads_cond);
23 MUTEX_UNLOCK(&threads_mutex);
31 Thread savethread = thr;
34 I32 oldscope = scopestack_ix;
39 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
43 thr->prev = thr->prev_run = savethread;
44 thr->next = savethread->next;
45 thr->next_run = savethread->next_run;
46 savethread->next = savethread->next_run = thr;
50 /* Now duplicate most of perl_call_sv but with a few twists */
53 myop.op_flags = OPf_STACKED;
54 myop.op_next = Nullop;
55 myop.op_flags |= OPf_KNOW;
56 myop.op_flags |= OPf_WANT_LIST;
57 op = pp_entersub(ARGS);
59 PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
61 * When this thread is next scheduled, we start in the right
62 * place. When the thread runs off the end of the sub, perl.c
63 * handles things, using savemark to figure out how much of the
64 * stack is the return value for any join.
66 thr = savethread; /* back to the old thread */
69 Thread thr = (Thread) arg;
72 I32 oldmark = TOPMARK;
73 I32 oldscope = scopestack_ix;
79 /* Don't call *anything* requiring dTHR until after pthread_setspecific */
81 * Wait until our creator releases us. If we didn't do this, then
82 * it would be potentially possible for out thread to carry on and
83 * do stuff before our creator fills in our "self" field. For example,
84 * if we went and created another thread which tried to pthread_join
85 * with us, then we'd be in a mess.
87 MUTEX_LOCK(&thr->mutex);
88 MUTEX_UNLOCK(&thr->mutex);
91 * It's safe to wait until now to set the thread-specific pointer
92 * from our pthread_t structure to our struct thread, since we're
93 * the only thread who can get at it anyway.
95 if (pthread_setspecific(thr_key, (void *) thr))
96 croak("panic: pthread_setspecific");
98 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
99 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
105 PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
111 /* my_exit() was called */
112 while (scopestack_ix > oldscope)
115 av_store(returnav, 0, newSViv(statusvalue));
119 /* Now duplicate most of perl_call_sv but with a few twists */
122 myop.op_flags = OPf_STACKED;
123 myop.op_next = Nullop;
124 myop.op_flags |= OPf_KNOW;
125 myop.op_flags |= OPf_WANT_LIST;
126 op = pp_entersub(ARGS);
130 retval = sp - (stack_base + oldmark);
131 sp = stack_base + oldmark + 1;
132 DEBUG_L(for (i = 1; i <= retval; i++)
133 PerlIO_printf(PerlIO_stderr(),
134 "%p returnav[%d] = %s\n",
135 thr, i, SvPEEK(sp[i - 1]));)
137 av_store(returnav, 0, newSVpv("", 0));
138 for (i = 1; i <= retval; i++, sp++)
139 sv_setsv(*av_fetch(returnav, i, TRUE), SvREFCNT_inc(*sp));
143 /* removed for debug */
144 SvREFCNT_dec(curstack);
146 SvREFCNT_dec(cvcache);
148 Safefree(scopestack);
152 Safefree(tmps_stack);
154 MUTEX_LOCK(&thr->mutex);
155 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
156 "%p: threadstart finishing: state is %u\n",
157 thr, ThrSTATE(thr)));
158 switch (ThrSTATE(thr)) {
159 case THRf_R_JOINABLE:
160 ThrSETSTATE(thr, THRf_ZOMBIE);
161 MUTEX_UNLOCK(&thr->mutex);
162 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
163 "%p: R_JOINABLE thread finished\n", thr));
166 ThrSETSTATE(thr, THRf_DEAD);
167 MUTEX_UNLOCK(&thr->mutex);
169 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
170 "%p: R_JOINED thread finished\n", thr));
172 case THRf_R_DETACHED:
173 ThrSETSTATE(thr, THRf_DEAD);
174 MUTEX_UNLOCK(&thr->mutex);
175 SvREFCNT_dec(returnav);
176 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
177 "%p: DETACHED thread finished\n", thr));
178 remove_thread(thr); /* This might trigger main thread to finish */
181 MUTEX_UNLOCK(&thr->mutex);
182 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
185 return (void *) returnav; /* Available for anyone to join with us */
186 /* unless we are detached in which case */
187 /* noone will see the value anyway. */
192 newthread(startsv, initargs, class)
202 sigset_t fullmask, oldmask;
206 SvGROW(sv, sizeof(struct thread) + 1);
207 SvCUR_set(sv, sizeof(struct thread));
208 thr = (Thread) SvPVX(sv);
209 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: newthread(%s) = %p)\n",
210 savethread, SvPEEK(startsv), thr));
212 /* If we don't zero these foostack pointers, init_stacks won't init them */
218 curcop = savethread->Tcurcop; /* XXX As good a guess as any? */
220 defstash = savethread->Tdefstash; /* XXX maybe these should */
221 curstash = savethread->Tcurstash; /* always be set to main? */
225 thr->flags = THRf_R_JOINABLE;
226 MUTEX_INIT(&thr->mutex);
227 thr->tid = ++threadnum;
228 /* Insert new thread into the circular linked list and bump nthreads */
229 MUTEX_LOCK(&threads_mutex);
230 thr->next = savethread->next;
231 thr->prev = savethread;
232 savethread->next = thr;
233 thr->next->prev = thr;
235 MUTEX_UNLOCK(&threads_mutex);
237 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
238 "%p: newthread, tid is %u, preparing stack\n",
239 savethread, 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));
251 /* On your marks... */
252 MUTEX_LOCK(&thr->mutex);
254 * Increment the global thread count.
256 sigfillset(&fullmask);
257 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
258 croak("panic: sigprocmask");
259 if (pthread_create(&self, NULL, threadstart, (void*) thr))
260 return NULL; /* XXX should clean up first */
262 MUTEX_UNLOCK(&thr->mutex);
263 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
264 croak("panic: sigprocmask");
266 sv = newSViv(thr->tid);
267 sv_magic(sv, oursv, '~', 0, 0);
268 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
269 return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
273 handle_thread_signal(sig)
277 write(sig_pipe[0], &c, 1);
280 MODULE = Thread PACKAGE = Thread
283 new(class, startsv, ...)
286 AV * av = av_make(items - 2, &ST(2));
288 XPUSHs(sv_2mortal(newthread(startsv, av, class)));
296 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
297 thr, t, ThrSTATE(t)););
298 MUTEX_LOCK(&t->mutex);
299 switch (ThrSTATE(t)) {
300 case THRf_R_JOINABLE:
302 ThrSETSTATE(t, THRf_R_JOINED);
303 MUTEX_UNLOCK(&t->mutex);
306 ThrSETSTATE(t, THRf_DEAD);
307 MUTEX_UNLOCK(&t->mutex);
311 MUTEX_UNLOCK(&t->mutex);
312 croak("can't join with thread");
315 if (pthread_join(t->Tself, (void **) &av))
316 croak("pthread_join failed");
318 /* Could easily speed up the following if necessary */
319 for (i = 0; i <= AvFILL(av); i++)
320 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
326 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
327 thr, t, ThrSTATE(t)););
328 MUTEX_LOCK(&t->mutex);
329 switch (ThrSTATE(t)) {
330 case THRf_R_JOINABLE:
331 ThrSETSTATE(t, THRf_R_DETACHED);
333 case THRf_R_DETACHED:
335 MUTEX_UNLOCK(&t->mutex);
338 ThrSETSTATE(t, THRf_DEAD);
340 MUTEX_UNLOCK(&t->mutex);
344 MUTEX_UNLOCK(&t->mutex);
345 croak("can't detach thread");
354 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
360 PUSHs(sv_2mortal(newSViv(t->flags)));
368 sv = newSViv(thr->tid);
369 sv_magic(sv, oursv, '~', 0, 0);
370 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
371 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));
377 MUTEX_LOCK(&t->mutex);
379 MUTEX_UNLOCK(&t->mutex);
392 #ifdef OLD_PTHREADS_API
395 #ifndef NO_SCHED_YIELD
397 #endif /* NO_SCHED_YIELD */
398 #endif /* OLD_PTHREADS_API */
408 mg = condpair_magic(sv);
409 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
410 MUTEX_LOCK(MgMUTEXP(mg));
411 if (MgOWNER(mg) != thr) {
412 MUTEX_UNLOCK(MgMUTEXP(mg));
413 croak("cond_wait for lock that we don't own\n");
416 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
418 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
420 MUTEX_UNLOCK(MgMUTEXP(mg));
430 mg = condpair_magic(sv);
431 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
432 MUTEX_LOCK(MgMUTEXP(mg));
433 if (MgOWNER(mg) != thr) {
434 MUTEX_UNLOCK(MgMUTEXP(mg));
435 croak("cond_signal for lock that we don't own\n");
437 COND_SIGNAL(MgCONDP(mg));
438 MUTEX_UNLOCK(MgMUTEXP(mg));
448 mg = condpair_magic(sv);
449 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
451 MUTEX_LOCK(MgMUTEXP(mg));
452 if (MgOWNER(mg) != thr) {
453 MUTEX_UNLOCK(MgMUTEXP(mg));
454 croak("cond_broadcast for lock that we don't own\n");
456 COND_BROADCAST(MgCONDP(mg));
457 MUTEX_UNLOCK(MgMUTEXP(mg));
470 * Iterate until we have enough dynamic storage for all threads.
471 * We mustn't do any allocation while holding threads_mutex though.
473 MUTEX_LOCK(&threads_mutex);
476 MUTEX_UNLOCK(&threads_mutex);
477 if (AvFILL(av) < n - 1) {
479 for (i = AvFILL(av); i < n - 1; i++) {
480 SV *sv = newSViv(0); /* fill in tid later */
481 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
482 av_push(av, sv_bless(newRV_noinc(sv),
483 gv_stashpv(class, TRUE)));
487 MUTEX_LOCK(&threads_mutex);
488 } while (n < nthreads);
489 n = nthreads; /* Get the final correct value */
492 * At this point, there's enough room to fill in av.
493 * Note that we are holding threads_mutex so the list
494 * won't change out from under us but all the remaining
495 * processing is "fast" (no blocking, malloc etc.)
500 SV *sv = (SV*)SvRV(*svp);
501 sv_setiv(sv, t->tid);
502 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->Toursv);
503 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
504 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
509 MUTEX_UNLOCK(&threads_mutex);
510 /* Truncate any unneeded slots in av */
512 /* Finally, push all the new objects onto the stack and drop av */
514 for (svp = AvARRAY(av); n > 0; n--, svp++)
516 (void)sv_2mortal((SV*)av);
519 MODULE = Thread PACKAGE = Thread::Signal
522 kill_sighandler_thread()
524 write(sig_pipe[0], "\0", 1);
528 init_thread_signals()
530 sighandlerp = handle_thread_signal;
531 if (pipe(sig_pipe) == -1)
542 ret = read(sig_pipe[1], &c, 1);
543 } while (ret == -1 && errno == EINTR);
545 croak("panic: await_signal");
548 RETVAL = c ? psig_ptr[c] : &sv_no;