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);
26 static THREAD_RET_TYPE
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 JOIN with us,
85 * 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.
97 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
98 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
104 PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
110 /* my_exit() was called */
111 while (scopestack_ix > oldscope)
114 av_store(returnav, 0, newSViv(statusvalue));
118 /* Now duplicate most of perl_call_sv but with a few twists */
121 myop.op_flags = OPf_STACKED;
122 myop.op_next = Nullop;
123 myop.op_flags |= OPf_KNOW;
124 myop.op_flags |= OPf_WANT_LIST;
125 op = pp_entersub(ARGS);
129 retval = sp - (stack_base + oldmark);
130 sp = stack_base + oldmark + 1;
131 DEBUG_L(for (i = 1; i <= retval; i++)
132 PerlIO_printf(PerlIO_stderr(),
133 "%p returnav[%d] = %s\n",
134 thr, i, SvPEEK(sp[i - 1]));)
136 av_store(returnav, 0, newSVpv("", 0));
137 for (i = 1; i <= retval; i++, sp++)
138 sv_setsv(*av_fetch(returnav, i, TRUE), SvREFCNT_inc(*sp));
142 /* removed for debug */
143 SvREFCNT_dec(curstack);
145 SvREFCNT_dec(cvcache);
147 Safefree(scopestack);
151 Safefree(tmps_stack);
153 MUTEX_LOCK(&thr->mutex);
154 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
155 "%p: threadstart finishing: state is %u\n",
156 thr, ThrSTATE(thr)));
157 switch (ThrSTATE(thr)) {
158 case THRf_R_JOINABLE:
159 ThrSETSTATE(thr, THRf_ZOMBIE);
160 MUTEX_UNLOCK(&thr->mutex);
161 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
162 "%p: R_JOINABLE thread finished\n", thr));
165 ThrSETSTATE(thr, THRf_DEAD);
166 MUTEX_UNLOCK(&thr->mutex);
168 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
169 "%p: R_JOINED thread finished\n", thr));
171 case THRf_R_DETACHED:
172 ThrSETSTATE(thr, THRf_DEAD);
173 MUTEX_UNLOCK(&thr->mutex);
174 SvREFCNT_dec(returnav);
175 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
176 "%p: DETACHED thread finished\n", thr));
177 remove_thread(thr); /* This might trigger main thread to finish */
180 MUTEX_UNLOCK(&thr->mutex);
181 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
184 return THREAD_RET_CAST(returnav); /* Available for anyone to join with */
185 /* us unless we're detached, in which */
186 /* case noone sees the value anyway. */
191 newthread(startsv, initargs, class)
202 #ifndef THREAD_CREATE
203 sigset_t fullmask, oldmask;
208 SvGROW(sv, sizeof(struct thread) + 1);
209 SvCUR_set(sv, sizeof(struct thread));
210 thr = (Thread) SvPVX(sv);
211 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: newthread(%s) = %p)\n",
212 savethread, SvPEEK(startsv), thr));
214 /* If we don't zero these foostack pointers, init_stacks won't init them */
220 curcop = savethread->Tcurcop; /* XXX As good a guess as any? */
222 defstash = savethread->Tdefstash; /* XXX maybe these should */
223 curstash = savethread->Tcurstash; /* always be set to main? */
227 thr->flags = THRf_R_JOINABLE;
228 MUTEX_INIT(&thr->mutex);
229 thr->tid = ++threadnum;
230 /* Insert new thread into the circular linked list and bump nthreads */
231 MUTEX_LOCK(&threads_mutex);
232 thr->next = savethread->next;
233 thr->prev = savethread;
234 savethread->next = thr;
235 thr->next->prev = thr;
237 MUTEX_UNLOCK(&threads_mutex);
239 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
240 "%p: newthread, tid is %u, preparing stack\n",
241 savethread, thr->tid));
242 /* The following pushes the arg list and startsv onto the *new* stack */
244 /* Could easily speed up the following greatly */
245 for (i = 0; i <= AvFILL(initargs); i++)
246 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
247 XPUSHs(SvREFCNT_inc(startsv));
251 THREAD_CREATE(thr, threadstart);
253 /* On your marks... */
254 MUTEX_LOCK(&thr->mutex);
256 sigfillset(&fullmask);
257 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
258 croak("panic: sigprocmask");
259 err = pthread_create(&self, pthread_attr_default, threadstart, (void*) thr);
261 MUTEX_UNLOCK(&thr->mutex);
264 /* Thread creation failed--clean up */
265 SvREFCNT_dec(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, oursv, '~', 0, 0);
281 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
282 return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
286 handle_thread_signal(sig)
290 write(sig_pipe[0], &c, 1);
293 MODULE = Thread PACKAGE = Thread
296 new(class, startsv, ...)
299 AV * av = av_make(items - 2, &ST(2));
301 XPUSHs(sv_2mortal(newthread(startsv, av, class)));
309 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
310 thr, t, ThrSTATE(t)););
311 MUTEX_LOCK(&t->mutex);
312 switch (ThrSTATE(t)) {
313 case THRf_R_JOINABLE:
315 ThrSETSTATE(t, THRf_R_JOINED);
316 MUTEX_UNLOCK(&t->mutex);
319 ThrSETSTATE(t, THRf_DEAD);
320 MUTEX_UNLOCK(&t->mutex);
324 MUTEX_UNLOCK(&t->mutex);
325 croak("can't join with thread");
330 /* Could easily speed up the following if necessary */
331 for (i = 0; i <= AvFILL(av); i++)
332 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
338 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
339 thr, t, ThrSTATE(t)););
340 MUTEX_LOCK(&t->mutex);
341 switch (ThrSTATE(t)) {
342 case THRf_R_JOINABLE:
343 ThrSETSTATE(t, THRf_R_DETACHED);
345 case THRf_R_DETACHED:
347 MUTEX_UNLOCK(&t->mutex);
350 ThrSETSTATE(t, THRf_DEAD);
352 MUTEX_UNLOCK(&t->mutex);
356 MUTEX_UNLOCK(&t->mutex);
357 croak("can't detach thread");
366 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
372 PUSHs(sv_2mortal(newSViv(t->flags)));
380 sv = newSViv(thr->tid);
381 sv_magic(sv, oursv, '~', 0, 0);
382 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
383 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));
389 MUTEX_LOCK(&t->mutex);
391 MUTEX_UNLOCK(&t->mutex);
414 mg = condpair_magic(sv);
415 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
416 MUTEX_LOCK(MgMUTEXP(mg));
417 if (MgOWNER(mg) != thr) {
418 MUTEX_UNLOCK(MgMUTEXP(mg));
419 croak("cond_wait for lock that we don't own\n");
422 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
424 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
426 MUTEX_UNLOCK(MgMUTEXP(mg));
436 mg = condpair_magic(sv);
437 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
438 MUTEX_LOCK(MgMUTEXP(mg));
439 if (MgOWNER(mg) != thr) {
440 MUTEX_UNLOCK(MgMUTEXP(mg));
441 croak("cond_signal for lock that we don't own\n");
443 COND_SIGNAL(MgCONDP(mg));
444 MUTEX_UNLOCK(MgMUTEXP(mg));
454 mg = condpair_magic(sv);
455 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
457 MUTEX_LOCK(MgMUTEXP(mg));
458 if (MgOWNER(mg) != thr) {
459 MUTEX_UNLOCK(MgMUTEXP(mg));
460 croak("cond_broadcast for lock that we don't own\n");
462 COND_BROADCAST(MgCONDP(mg));
463 MUTEX_UNLOCK(MgMUTEXP(mg));
476 * Iterate until we have enough dynamic storage for all threads.
477 * We mustn't do any allocation while holding threads_mutex though.
479 MUTEX_LOCK(&threads_mutex);
482 MUTEX_UNLOCK(&threads_mutex);
483 if (AvFILL(av) < n - 1) {
485 for (i = AvFILL(av); i < n - 1; i++) {
486 SV *sv = newSViv(0); /* fill in tid later */
487 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
488 av_push(av, sv_bless(newRV_noinc(sv),
489 gv_stashpv(class, TRUE)));
493 MUTEX_LOCK(&threads_mutex);
494 } while (n < nthreads);
495 n = nthreads; /* Get the final correct value */
498 * At this point, there's enough room to fill in av.
499 * Note that we are holding threads_mutex so the list
500 * won't change out from under us but all the remaining
501 * processing is "fast" (no blocking, malloc etc.)
506 SV *sv = (SV*)SvRV(*svp);
507 sv_setiv(sv, t->tid);
508 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->Toursv);
509 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
510 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
515 MUTEX_UNLOCK(&threads_mutex);
516 /* Truncate any unneeded slots in av */
518 /* Finally, push all the new objects onto the stack and drop av */
520 for (svp = AvARRAY(av); n > 0; n--, svp++)
522 (void)sv_2mortal((SV*)av);
525 MODULE = Thread PACKAGE = Thread::Signal
528 kill_sighandler_thread()
530 write(sig_pipe[0], "\0", 1);
534 init_thread_signals()
536 sighandlerp = handle_thread_signal;
537 if (pipe(sig_pipe) == -1)
548 ret = read(sig_pipe[1], &c, 1);
549 } while (ret == -1 && errno == EINTR);
551 croak("panic: await_signal");
554 RETVAL = c ? psig_ptr[c] : &sv_no;