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));
120 /* Now duplicate most of perl_call_sv but with a few twists */
123 myop.op_flags = OPf_STACKED;
124 myop.op_next = Nullop;
125 myop.op_flags |= OPf_KNOW;
126 myop.op_flags |= OPf_WANT_LIST;
127 op = pp_entersub(ARGS);
131 retval = sp - (stack_base + oldmark);
132 sp = stack_base + oldmark + 1;
133 DEBUG_L(for (i = 1; i <= retval; i++)
134 PerlIO_printf(PerlIO_stderr(),
135 "%p returnav[%d] = %s\n",
136 thr, i, SvPEEK(sp[i - 1]));)
138 av_store(returnav, 0, newSVpv("", 0));
139 for (i = 1; i <= retval; i++, sp++)
140 sv_setsv(*av_fetch(returnav, i, TRUE), SvREFCNT_inc(*sp));
144 /* removed for debug */
145 SvREFCNT_dec(curstack);
147 SvREFCNT_dec(thr->cvcache);
148 SvREFCNT_dec(thr->magicals);
149 SvREFCNT_dec(thr->specific);
151 Safefree(scopestack);
155 Safefree(tmps_stack);
158 MUTEX_LOCK(&thr->mutex);
159 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
160 "%p: threadstart finishing: state is %u\n",
161 thr, ThrSTATE(thr)));
162 switch (ThrSTATE(thr)) {
163 case THRf_R_JOINABLE:
164 ThrSETSTATE(thr, THRf_ZOMBIE);
165 MUTEX_UNLOCK(&thr->mutex);
166 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
167 "%p: R_JOINABLE thread finished\n", thr));
170 ThrSETSTATE(thr, THRf_DEAD);
171 MUTEX_UNLOCK(&thr->mutex);
173 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
174 "%p: R_JOINED thread finished\n", thr));
176 case THRf_R_DETACHED:
177 ThrSETSTATE(thr, THRf_DEAD);
178 MUTEX_UNLOCK(&thr->mutex);
179 SvREFCNT_dec(returnav);
180 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
181 "%p: DETACHED thread finished\n", thr));
182 remove_thread(thr); /* This might trigger main thread to finish */
185 MUTEX_UNLOCK(&thr->mutex);
186 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
189 return THREAD_RET_CAST(returnav); /* Available for anyone to join with */
190 /* us unless we're detached, in which */
191 /* case noone sees the value anyway. */
196 newthread(startsv, initargs, class)
207 #ifndef THREAD_CREATE
208 sigset_t fullmask, oldmask;
212 thr = new_struct_thread(thr);
214 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
215 "%p: newthread, tid is %u, preparing stack\n",
216 savethread, thr->tid));
217 /* The following pushes the arg list and startsv onto the *new* stack */
219 /* Could easily speed up the following greatly */
220 for (i = 0; i <= AvFILL(initargs); i++)
221 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
222 XPUSHs(SvREFCNT_inc(startsv));
226 THREAD_CREATE(thr, threadstart);
228 /* On your marks... */
229 MUTEX_LOCK(&thr->mutex);
231 sigfillset(&fullmask);
232 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
233 croak("panic: sigprocmask");
234 err = pthread_create(&thr->self, pthread_attr_default,
235 threadstart, (void*) thr);
237 MUTEX_UNLOCK(&thr->mutex);
240 /* Thread creation failed--clean up */
241 SvREFCNT_dec(thr->cvcache);
243 MUTEX_DESTROY(&thr->mutex);
244 for (i = 0; i <= AvFILL(initargs); i++)
245 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
246 SvREFCNT_dec(startsv);
249 #ifdef THREAD_POST_CREATE
250 THREAD_POST_CREATE(thr);
252 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
253 croak("panic: sigprocmask");
255 sv = newSViv(thr->tid);
256 sv_magic(sv, thr->oursv, '~', 0, 0);
257 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
258 return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
262 handle_thread_signal(sig)
266 write(sig_pipe[0], &c, 1);
269 MODULE = Thread PACKAGE = Thread
272 new(class, startsv, ...)
275 AV * av = av_make(items - 2, &ST(2));
277 XPUSHs(sv_2mortal(newthread(startsv, av, class)));
285 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
286 thr, t, ThrSTATE(t)););
287 MUTEX_LOCK(&t->mutex);
288 switch (ThrSTATE(t)) {
289 case THRf_R_JOINABLE:
291 ThrSETSTATE(t, THRf_R_JOINED);
292 MUTEX_UNLOCK(&t->mutex);
295 ThrSETSTATE(t, THRf_DEAD);
296 MUTEX_UNLOCK(&t->mutex);
300 MUTEX_UNLOCK(&t->mutex);
301 croak("can't join with thread");
306 /* Could easily speed up the following if necessary */
307 for (i = 0; i <= AvFILL(av); i++)
308 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
314 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
315 thr, t, ThrSTATE(t)););
316 MUTEX_LOCK(&t->mutex);
317 switch (ThrSTATE(t)) {
318 case THRf_R_JOINABLE:
319 ThrSETSTATE(t, THRf_R_DETACHED);
321 case THRf_R_DETACHED:
323 MUTEX_UNLOCK(&t->mutex);
326 ThrSETSTATE(t, THRf_DEAD);
328 MUTEX_UNLOCK(&t->mutex);
332 MUTEX_UNLOCK(&t->mutex);
333 croak("can't detach thread");
342 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
348 PUSHs(sv_2mortal(newSViv(t->flags)));
356 sv = newSViv(thr->tid);
357 sv_magic(sv, thr->oursv, '~', 0, 0);
358 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
359 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));
365 MUTEX_LOCK(&t->mutex);
367 MUTEX_UNLOCK(&t->mutex);
390 mg = condpair_magic(sv);
391 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
392 MUTEX_LOCK(MgMUTEXP(mg));
393 if (MgOWNER(mg) != thr) {
394 MUTEX_UNLOCK(MgMUTEXP(mg));
395 croak("cond_wait for lock that we don't own\n");
398 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
400 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
402 MUTEX_UNLOCK(MgMUTEXP(mg));
412 mg = condpair_magic(sv);
413 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
414 MUTEX_LOCK(MgMUTEXP(mg));
415 if (MgOWNER(mg) != thr) {
416 MUTEX_UNLOCK(MgMUTEXP(mg));
417 croak("cond_signal for lock that we don't own\n");
419 COND_SIGNAL(MgCONDP(mg));
420 MUTEX_UNLOCK(MgMUTEXP(mg));
430 mg = condpair_magic(sv);
431 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
433 MUTEX_LOCK(MgMUTEXP(mg));
434 if (MgOWNER(mg) != thr) {
435 MUTEX_UNLOCK(MgMUTEXP(mg));
436 croak("cond_broadcast for lock that we don't own\n");
438 COND_BROADCAST(MgCONDP(mg));
439 MUTEX_UNLOCK(MgMUTEXP(mg));
452 * Iterate until we have enough dynamic storage for all threads.
453 * We mustn't do any allocation while holding threads_mutex though.
455 MUTEX_LOCK(&threads_mutex);
458 MUTEX_UNLOCK(&threads_mutex);
459 if (AvFILL(av) < n - 1) {
461 for (i = AvFILL(av); i < n - 1; i++) {
462 SV *sv = newSViv(0); /* fill in tid later */
463 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
464 av_push(av, sv_bless(newRV_noinc(sv),
465 gv_stashpv(class, TRUE)));
469 MUTEX_LOCK(&threads_mutex);
470 } while (n < nthreads);
471 n = nthreads; /* Get the final correct value */
474 * At this point, there's enough room to fill in av.
475 * Note that we are holding threads_mutex so the list
476 * won't change out from under us but all the remaining
477 * processing is "fast" (no blocking, malloc etc.)
482 SV *sv = (SV*)SvRV(*svp);
483 sv_setiv(sv, t->tid);
484 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
485 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
486 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
491 MUTEX_UNLOCK(&threads_mutex);
492 /* Truncate any unneeded slots in av */
494 /* Finally, push all the new objects onto the stack and drop av */
496 for (svp = AvARRAY(av); n > 0; n--, svp++)
498 (void)sv_2mortal((SV*)av);
501 MODULE = Thread PACKAGE = Thread::Signal
504 kill_sighandler_thread()
506 write(sig_pipe[0], "\0", 1);
510 init_thread_signals()
512 sighandlerp = handle_thread_signal;
513 if (pipe(sig_pipe) == -1)
524 ret = read(sig_pipe[1], &c, 1);
525 } while (ret == -1 && errno == EINTR);
527 croak("panic: await_signal");
530 RETVAL = c ? psig_ptr[c] : &sv_no;