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 thread *Thread;
20 #define THREAD_RET_TYPE void *
21 #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
25 remove_thread(struct 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;
92 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
95 /* Don't call *anything* requiring dTHR until after SET_THR() */
97 * Wait until our creator releases us. If we didn't do this, then
98 * it would be potentially possible for out thread to carry on and
99 * do stuff before our creator fills in our "self" field. For example,
100 * if we went and created another thread which tried to JOIN with us,
101 * then we'd be in a mess.
103 MUTEX_LOCK(&thr->mutex);
104 MUTEX_UNLOCK(&thr->mutex);
107 * It's safe to wait until now to set the thread-specific pointer
108 * from our pthread_t structure to our struct thread, since we're
109 * the only thread who can get at it anyway.
113 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
114 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
120 PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
126 /* my_exit() was called */
127 while (scopestack_ix > oldscope)
130 av_store(returnav, 0, newSViv(statusvalue));
136 /* Now duplicate most of perl_call_sv but with a few twists */
139 myop.op_flags = OPf_STACKED;
140 myop.op_next = Nullop;
141 myop.op_flags |= OPf_KNOW;
142 myop.op_flags |= OPf_WANT_LIST;
143 op = pp_entersub(ARGS);
147 retval = sp - (stack_base + oldmark);
148 sp = stack_base + oldmark + 1;
149 DEBUG_L(for (i = 1; i <= retval; i++)
150 PerlIO_printf(PerlIO_stderr(),
151 "%p returnav[%d] = %s\n",
152 thr, i, SvPEEK(sp[i - 1]));)
154 av_store(returnav, 0, newSVpv("", 0));
155 for (i = 1; i <= retval; i++, sp++)
156 sv_setsv(*av_fetch(returnav, i, TRUE), SvREFCNT_inc(*sp));
160 /* removed for debug */
161 SvREFCNT_dec(curstack);
163 SvREFCNT_dec(thr->cvcache);
164 SvREFCNT_dec(thr->magicals);
165 SvREFCNT_dec(thr->specific);
167 Safefree(scopestack);
171 Safefree(tmps_stack);
174 MUTEX_LOCK(&thr->mutex);
175 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
176 "%p: threadstart finishing: state is %u\n",
177 thr, ThrSTATE(thr)));
178 switch (ThrSTATE(thr)) {
179 case THRf_R_JOINABLE:
180 ThrSETSTATE(thr, THRf_ZOMBIE);
181 MUTEX_UNLOCK(&thr->mutex);
182 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
183 "%p: R_JOINABLE thread finished\n", thr));
186 ThrSETSTATE(thr, THRf_DEAD);
187 MUTEX_UNLOCK(&thr->mutex);
189 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
190 "%p: R_JOINED thread finished\n", thr));
192 case THRf_R_DETACHED:
193 ThrSETSTATE(thr, THRf_DEAD);
194 MUTEX_UNLOCK(&thr->mutex);
195 SvREFCNT_dec(returnav);
196 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
197 "%p: DETACHED thread finished\n", thr));
198 remove_thread(thr); /* This might trigger main thread to finish */
201 MUTEX_UNLOCK(&thr->mutex);
202 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
205 return THREAD_RET_CAST(returnav); /* Available for anyone to join with */
206 /* us unless we're detached, in which */
207 /* case noone sees the value anyway. */
210 return THREAD_RET_CAST(NULL);
215 newthread (SV *startsv, AV *initargs, char *Class)
223 #ifndef THREAD_CREATE
224 sigset_t fullmask, oldmask;
228 thr = new_struct_thread(thr);
230 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
231 "%p: newthread (%p), tid is %u, preparing stack\n",
232 savethread, thr, thr->tid));
233 /* The following pushes the arg list and startsv onto the *new* stack */
235 /* Could easily speed up the following greatly */
236 for (i = 0; i <= AvFILL(initargs); i++)
237 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
238 XPUSHs(SvREFCNT_inc(startsv));
241 err = THREAD_CREATE(thr, threadstart);
243 /* On your marks... */
244 MUTEX_LOCK(&thr->mutex);
246 sigfillset(&fullmask);
247 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
248 croak("panic: sigprocmask");
249 err = pthread_create(&thr->self, pthread_attr_default,
250 threadstart, (void*) thr);
252 MUTEX_UNLOCK(&thr->mutex);
255 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
256 "%p: create of %p failed %d\n", savethread, thr, err));
257 /* Thread creation failed--clean up */
258 SvREFCNT_dec(thr->cvcache);
260 MUTEX_DESTROY(&thr->mutex);
261 for (i = 0; i <= AvFILL(initargs); i++)
262 SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
263 SvREFCNT_dec(startsv);
266 #ifdef THREAD_POST_CREATE
267 THREAD_POST_CREATE(thr);
269 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
270 croak("panic: sigprocmask");
272 sv = newSViv(thr->tid);
273 sv_magic(sv, thr->oursv, '~', 0, 0);
274 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
275 return sv_bless(newRV_noinc(sv), gv_stashpv(Class, TRUE));
277 croak("No threads in this perl");
282 static Signal_t handle_thread_signal _((int sig));
285 handle_thread_signal(int sig)
288 write(sig_pipe[0], &c, 1);
291 MODULE = Thread PACKAGE = Thread
295 new(Class, startsv, ...)
298 AV * av = av_make(items - 2, &ST(2));
300 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)));
340 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
341 thr, t, ThrSTATE(t)););
342 MUTEX_LOCK(&t->mutex);
343 switch (ThrSTATE(t)) {
344 case THRf_R_JOINABLE:
345 ThrSETSTATE(t, THRf_R_DETACHED);
347 case THRf_R_DETACHED:
349 MUTEX_UNLOCK(&t->mutex);
352 ThrSETSTATE(t, THRf_DEAD);
354 MUTEX_UNLOCK(&t->mutex);
358 MUTEX_UNLOCK(&t->mutex);
359 croak("can't detach thread");
369 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
376 PUSHs(sv_2mortal(newSViv(t->flags)));
386 sv = newSViv(thr->tid);
387 sv_magic(sv, thr->oursv, '~', 0, 0);
388 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
389 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(Class, TRUE))));
397 MUTEX_LOCK(&t->mutex);
399 MUTEX_UNLOCK(&t->mutex);
430 mg = condpair_magic(sv);
431 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
432 MUTEX_LOCK(MgMUTEXP(mg));
433 if (MgOWNER(mg) != thr) {
434 MUTEX_UNLOCK(MgMUTEXP(mg));
435 croak("cond_wait for lock that we don't own\n");
438 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
440 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
442 MUTEX_UNLOCK(MgMUTEXP(mg));
454 mg = condpair_magic(sv);
455 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
456 MUTEX_LOCK(MgMUTEXP(mg));
457 if (MgOWNER(mg) != thr) {
458 MUTEX_UNLOCK(MgMUTEXP(mg));
459 croak("cond_signal for lock that we don't own\n");
461 COND_SIGNAL(MgCONDP(mg));
462 MUTEX_UNLOCK(MgMUTEXP(mg));
474 mg = condpair_magic(sv);
475 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
477 MUTEX_LOCK(MgMUTEXP(mg));
478 if (MgOWNER(mg) != thr) {
479 MUTEX_UNLOCK(MgMUTEXP(mg));
480 croak("cond_broadcast for lock that we don't own\n");
482 COND_BROADCAST(MgCONDP(mg));
483 MUTEX_UNLOCK(MgMUTEXP(mg));
498 * Iterate until we have enough dynamic storage for all threads.
499 * We mustn't do any allocation while holding threads_mutex though.
501 MUTEX_LOCK(&threads_mutex);
504 MUTEX_UNLOCK(&threads_mutex);
505 if (AvFILL(av) < n - 1) {
507 for (i = AvFILL(av); i < n - 1; i++) {
508 SV *sv = newSViv(0); /* fill in tid later */
509 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
510 av_push(av, sv_bless(newRV_noinc(sv),
511 gv_stashpv(Class, TRUE)));
515 MUTEX_LOCK(&threads_mutex);
516 } while (n < nthreads);
517 n = nthreads; /* Get the final correct value */
520 * At this point, there's enough room to fill in av.
521 * Note that we are holding threads_mutex so the list
522 * won't change out from under us but all the remaining
523 * processing is "fast" (no blocking, malloc etc.)
528 SV *sv = (SV*)SvRV(*svp);
529 sv_setiv(sv, t->tid);
530 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
531 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
532 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
537 MUTEX_UNLOCK(&threads_mutex);
538 /* Truncate any unneeded slots in av */
540 /* Finally, push all the new objects onto the stack and drop av */
542 for (svp = AvARRAY(av); n > 0; n--, svp++)
544 (void)sv_2mortal((SV*)av);
548 MODULE = Thread PACKAGE = Thread::Signal
551 kill_sighandler_thread()
553 write(sig_pipe[0], "\0", 1);
557 init_thread_signals()
559 sighandlerp = handle_thread_signal;
560 if (pipe(sig_pipe) == -1)
571 ret = read(sig_pipe[1], &c, 1);
572 } while (ret == -1 && errno == EINTR);
574 croak("panic: await_signal");
577 RETVAL = c ? psig_ptr[c] : &sv_no;