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AIX patch (including Configure support for {sched,pthread}_yield,
[perl5.git] / ext / Thread / Thread.xs
CommitLineData
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1#include "EXTERN.h"
2#include "perl.h"
3#include "XSUB.h"
4
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5/* Magic signature for Thread's mg_private is "Th" */
6#define Thread_MAGIC_SIGNATURE 0x5468
7
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8#ifdef __cplusplus
9#ifdef I_UNISTD
10#include <unistd.h>
11#endif
12#endif
13#include <fcntl.h>
14
7d901afa 15static U32 threadnum = 0;
85ced67f 16static int sig_pipe[2];
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17
18#ifndef THREAD_RET_TYPE
52e1cb5e 19typedef struct perl_thread *Thread;
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20#define THREAD_RET_TYPE void *
21#define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
458fb581 22#endif
683929b4 23
7d901afa 24static void
52e1cb5e 25remove_thread(struct perl_thread *t)
7d901afa 26{
f0f333f4 27#ifdef USE_THREADS
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28 DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
29 "%p: remove_thread %p\n", thr, t)));
30 MUTEX_LOCK(&threads_mutex);
0a00ffdb 31 MUTEX_DESTROY(&t->mutex);
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32 nthreads--;
33 t->prev->next = t->next;
34 t->next->prev = t->prev;
35 COND_BROADCAST(&nthreads_cond);
36 MUTEX_UNLOCK(&threads_mutex);
f0f333f4 37#endif
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38}
39
ea0efc06 40static THREAD_RET_TYPE
f0f333f4 41threadstart(void *arg)
d9bb3666 42{
f0f333f4 43#ifdef USE_THREADS
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44#ifdef FAKE_THREADS
45 Thread savethread = thr;
46 LOGOP myop;
47 dSP;
48 I32 oldscope = scopestack_ix;
49 I32 retval;
458fb581 50 AV *av;
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51 int i;
52
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53 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
54 thr, SvPEEK(TOPs)));
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55 thr = (Thread) arg;
56 savemark = TOPMARK;
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;
61 thr->wait_queue = 0;
62 thr->private = 0;
63
64 /* Now duplicate most of perl_call_sv but with a few twists */
65 op = (OP*)&myop;
66 Zero(op, 1, LOGOP);
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);
72 DEBUG_L(if (!op)
73 PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
74 /*
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.
79 */
80 thr = savethread; /* back to the old thread */
81 return 0;
82#else
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83 Thread thr = (Thread) arg;
84 LOGOP myop;
4e35701f 85 djSP;
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86 I32 oldmark = TOPMARK;
87 I32 oldscope = scopestack_ix;
88 I32 retval;
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89 SV *sv;
90 AV *av = newAV();
14fcddff 91 int i, ret;
783070da 92 dJMPENV;
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93 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
94 thr));
783070da 95
0b9678a8 96 /* Don't call *anything* requiring dTHR until after SET_THR() */
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97 /*
98 * Wait until our creator releases us. If we didn't do this, then
99 * it would be potentially possible for out thread to carry on and
100 * do stuff before our creator fills in our "self" field. For example,
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101 * if we went and created another thread which tried to JOIN with us,
102 * then we'd be in a mess.
d9bb3666 103 */
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104 MUTEX_LOCK(&thr->mutex);
105 MUTEX_UNLOCK(&thr->mutex);
d9bb3666 106
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107 /*
108 * It's safe to wait until now to set the thread-specific pointer
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109 * from our pthread_t structure to our struct perl_thread, since
110 * we're the only thread who can get at it anyway.
d9bb3666 111 */
ea0efc06 112 SET_THR(thr);
d9bb3666 113
783070da 114 /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
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115 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
116 thr, SvPEEK(TOPs)));
783070da 117
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118 sv = POPs;
119 PUTBACK;
120 perl_call_sv(sv, G_ARRAY|G_EVAL);
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121 SPAGAIN;
122 retval = sp - (stack_base + oldmark);
123 sp = stack_base + oldmark + 1;
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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, &sv_no);
129 av_store(av, 1, newSVsv(thr->errsv));
130 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p died: %s\n",
131 SvPV(thr->errsv, na));
132 } else {
133 DEBUG_L(STMT_START {
134 for (i = 1; i <= retval; i++) {
135 PerlIO_printf(PerlIO_stderr(), "%p return[%d] = %s\n",
136 thr, i, SvPEEK(sp[i - 1]));)
137 }
138 } STMT_END);
139 av_store(av, 0, &sv_yes);
140 for (i = 1; i <= retval; i++, sp++)
141 sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*sp));
142 }
143
d9bb3666 144 finishoff:
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145#if 0
146 /* removed for debug */
147 SvREFCNT_dec(curstack);
148#endif
199100c8 149 SvREFCNT_dec(thr->cvcache);
54b9620d 150 SvREFCNT_dec(thr->threadsv);
554b3eca 151 SvREFCNT_dec(thr->specific);
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152 SvREFCNT_dec(thr->errsv);
153 SvREFCNT_dec(thr->errhv);
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154 Safefree(markstack);
155 Safefree(scopestack);
156 Safefree(savestack);
157 Safefree(retstack);
158 Safefree(cxstack);
159 Safefree(tmps_stack);
199100c8 160 Safefree(ofs);
d9bb3666 161
14fcddff 162 MUTEX_LOCK(&thr->mutex);
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163 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
164 "%p: threadstart finishing: state is %u\n",
165 thr, ThrSTATE(thr)));
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166 switch (ThrSTATE(thr)) {
167 case THRf_R_JOINABLE:
168 ThrSETSTATE(thr, THRf_ZOMBIE);
169 MUTEX_UNLOCK(&thr->mutex);
783070da 170 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
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171 "%p: R_JOINABLE thread finished\n", thr));
172 break;
173 case THRf_R_JOINED:
174 ThrSETSTATE(thr, THRf_DEAD);
175 MUTEX_UNLOCK(&thr->mutex);
50112d62 176 remove_thread(thr);
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177 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
178 "%p: R_JOINED thread finished\n", thr));
179 break;
50112d62 180 case THRf_R_DETACHED:
683929b4 181 ThrSETSTATE(thr, THRf_DEAD);
14fcddff 182 MUTEX_UNLOCK(&thr->mutex);
458fb581 183 SvREFCNT_dec(av);
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184 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
185 "%p: DETACHED thread finished\n", thr));
50112d62 186 remove_thread(thr); /* This might trigger main thread to finish */
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187 break;
188 default:
189 MUTEX_UNLOCK(&thr->mutex);
190 croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
191 /* NOTREACHED */
734689b1 192 }
458fb581 193 return THREAD_RET_CAST(av); /* Available for anyone to join with */
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194 /* us unless we're detached, in which */
195 /* case noone sees the value anyway. */
783070da 196#endif
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197#else
198 return THREAD_RET_CAST(NULL);
199#endif
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200}
201
683929b4 202static SV *
458fb581 203newthread (SV *startsv, AV *initargs, char *classname)
d9bb3666 204{
f0f333f4 205#ifdef USE_THREADS
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206 dSP;
207 Thread savethread;
208 int i;
683929b4 209 SV *sv;
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210 int err;
211#ifndef THREAD_CREATE
f152979c 212 sigset_t fullmask, oldmask;
ea0efc06 213#endif
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214
215 savethread = thr;
a863c7d1 216 thr = new_struct_thread(thr);
d9bb3666 217 SPAGAIN;
50112d62 218 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
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219 "%p: newthread (%p), tid is %u, preparing stack\n",
220 savethread, thr, thr->tid));
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221 /* The following pushes the arg list and startsv onto the *new* stack */
222 PUSHMARK(sp);
223 /* Could easily speed up the following greatly */
734689b1 224 for (i = 0; i <= AvFILL(initargs); i++)
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225 XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
226 XPUSHs(SvREFCNT_inc(startsv));
227 PUTBACK;
ea0efc06 228#ifdef THREAD_CREATE
f0f333f4 229 err = THREAD_CREATE(thr, threadstart);
783070da 230#else
d9bb3666 231 /* On your marks... */
14fcddff 232 MUTEX_LOCK(&thr->mutex);
ea0efc06 233 /* Get set... */
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234 sigfillset(&fullmask);
235 if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
236 croak("panic: sigprocmask");
52e1cb5e 237#ifdef PTHREADS_CREATED_JOINABLE
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238 err = pthread_create(&thr->self, pthread_attr_default,
239 threadstart, (void*) thr);
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240#else
241 {
242 pthread_attr_t attr;
243
244 err = pthread_attr_init(&attr);
245 if (err == 0) {
246#ifdef PTHREAD_CREATE_UNDETACHED
247 err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_UNDETACHED);
248#else
249 croak("panic: pthread_attr_setdetachstate");
250#endif
251 if (err == 0)
252 err = pthread_create(&thr->self, &attr,
253 threadstart, (void*) thr);
254 }
255 pthread_attr_destroy(&attr);
256 }
257#endif
d9bb3666 258 /* Go */
14fcddff 259 MUTEX_UNLOCK(&thr->mutex);
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260#endif
261 if (err) {
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262 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
263 "%p: create of %p failed %d\n", savethread, thr, err));
ea0efc06 264 /* Thread creation failed--clean up */
199100c8 265 SvREFCNT_dec(thr->cvcache);
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266 remove_thread(thr);
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);
271 return NULL;
272 }
273#ifdef THREAD_POST_CREATE
274 THREAD_POST_CREATE(thr);
275#else
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276 if (sigprocmask(SIG_SETMASK, &oldmask, 0))
277 croak("panic: sigprocmask");
783070da 278#endif
7d901afa 279 sv = newSViv(thr->tid);
199100c8 280 sv_magic(sv, thr->oursv, '~', 0, 0);
7d901afa 281 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
458fb581 282 return sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
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283#else
284 croak("No threads in this perl");
285 return &sv_undef;
286#endif
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287}
288
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289static Signal_t handle_thread_signal _((int sig));
290
f152979c 291static Signal_t
f0f333f4 292handle_thread_signal(int sig)
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293{
294 char c = (char) sig;
295 write(sig_pipe[0], &c, 1);
296}
297
d9bb3666 298MODULE = Thread PACKAGE = Thread
0b9678a8 299PROTOTYPES: DISABLE
d9bb3666 300
683929b4 301void
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302new(classname, startsv, ...)
303 char * classname
d9bb3666 304 SV * startsv
734689b1 305 AV * av = av_make(items - 2, &ST(2));
683929b4 306 PPCODE:
458fb581 307 XPUSHs(sv_2mortal(newthread(startsv, av, classname)));
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308
309void
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310join(t)
311 Thread t
312 AV * av = NO_INIT
313 int i = NO_INIT
314 PPCODE:
f0f333f4 315#ifdef USE_THREADS
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316 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
317 thr, t, ThrSTATE(t)););
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318 MUTEX_LOCK(&t->mutex);
319 switch (ThrSTATE(t)) {
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320 case THRf_R_JOINABLE:
321 case THRf_R_JOINED:
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322 ThrSETSTATE(t, THRf_R_JOINED);
323 MUTEX_UNLOCK(&t->mutex);
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324 break;
325 case THRf_ZOMBIE:
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326 ThrSETSTATE(t, THRf_DEAD);
327 MUTEX_UNLOCK(&t->mutex);
328 remove_thread(t);
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329 break;
330 default:
50112d62 331 MUTEX_UNLOCK(&t->mutex);
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332 croak("can't join with thread");
333 /* NOTREACHED */
334 }
ea0efc06 335 JOIN(t, &av);
7d901afa 336
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337 if (SvTRUE(*av_fetch(av, 0, FALSE))) {
338 /* Could easily speed up the following if necessary */
339 for (i = 1; i <= AvFILL(av); i++)
340 XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
341 } else {
342 char *mess = SvPV(*av_fetch(av, 1, FALSE), na);
343 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
344 "%p: join propagating die message: %s\n",
345 thr, mess));
346 croak(mess);
347 }
f0f333f4 348#endif
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349
350void
734689b1 351detach(t)
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352 Thread t
353 CODE:
f0f333f4 354#ifdef USE_THREADS
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355 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
356 thr, t, ThrSTATE(t)););
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357 MUTEX_LOCK(&t->mutex);
358 switch (ThrSTATE(t)) {
14fcddff 359 case THRf_R_JOINABLE:
50112d62 360 ThrSETSTATE(t, THRf_R_DETACHED);
14fcddff 361 /* fall through */
50112d62 362 case THRf_R_DETACHED:
14fcddff 363 DETACH(t);
50112d62 364 MUTEX_UNLOCK(&t->mutex);
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365 break;
366 case THRf_ZOMBIE:
50112d62 367 ThrSETSTATE(t, THRf_DEAD);
7d901afa 368 DETACH(t);
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369 MUTEX_UNLOCK(&t->mutex);
370 remove_thread(t);
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371 break;
372 default:
50112d62 373 MUTEX_UNLOCK(&t->mutex);
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374 croak("can't detach thread");
375 /* NOTREACHED */
734689b1 376 }
f0f333f4 377#endif
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378
379void
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380equal(t1, t2)
381 Thread t1
382 Thread t2
383 PPCODE:
384 PUSHs((t1 == t2) ? &sv_yes : &sv_no);
385
386void
387flags(t)
388 Thread t
389 PPCODE:
f0f333f4 390#ifdef USE_THREADS
7d901afa 391 PUSHs(sv_2mortal(newSViv(t->flags)));
f0f333f4 392#endif
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393
394void
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395self(classname)
396 char * classname
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397 PREINIT:
398 SV *sv;
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399 PPCODE:
400#ifdef USE_THREADS
7d901afa 401 sv = newSViv(thr->tid);
199100c8 402 sv_magic(sv, thr->oursv, '~', 0, 0);
7d901afa 403 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
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404 PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
405 gv_stashpv(classname, TRUE))));
f0f333f4 406#endif
7d901afa 407
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408U32
409tid(t)
410 Thread t
411 CODE:
f0f333f4 412#ifdef USE_THREADS
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413 MUTEX_LOCK(&t->mutex);
414 RETVAL = t->tid;
415 MUTEX_UNLOCK(&t->mutex);
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416#else
417 RETVAL = 0;
418#endif
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419 OUTPUT:
420 RETVAL
421
422void
423DESTROY(t)
424 SV * t
425 PPCODE:
426 PUSHs(&sv_yes);
427
7d901afa 428void
734689b1 429yield()
d9bb3666 430 CODE:
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431{
432#ifdef USE_THREADS
ea0efc06 433 YIELD;
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434#endif
435}
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436
437void
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438cond_wait(sv)
439 SV * sv
440 MAGIC * mg = NO_INIT
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441CODE:
442#ifdef USE_THREADS
2c127b02 443 if (SvROK(sv))
734689b1 444 sv = SvRV(sv);
2c127b02 445
734689b1 446 mg = condpair_magic(sv);
683929b4 447 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
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448 MUTEX_LOCK(MgMUTEXP(mg));
449 if (MgOWNER(mg) != thr) {
450 MUTEX_UNLOCK(MgMUTEXP(mg));
451 croak("cond_wait for lock that we don't own\n");
452 }
453 MgOWNER(mg) = 0;
454 COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
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455 while (MgOWNER(mg))
456 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
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457 MgOWNER(mg) = thr;
458 MUTEX_UNLOCK(MgMUTEXP(mg));
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459#endif
460
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461void
462cond_signal(sv)
463 SV * sv
464 MAGIC * mg = NO_INIT
465CODE:
f0f333f4 466#ifdef USE_THREADS
50112d62 467 if (SvROK(sv))
734689b1 468 sv = SvRV(sv);
50112d62 469
734689b1 470 mg = condpair_magic(sv);
683929b4 471 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
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472 MUTEX_LOCK(MgMUTEXP(mg));
473 if (MgOWNER(mg) != thr) {
474 MUTEX_UNLOCK(MgMUTEXP(mg));
475 croak("cond_signal for lock that we don't own\n");
476 }
477 COND_SIGNAL(MgCONDP(mg));
478 MUTEX_UNLOCK(MgMUTEXP(mg));
f0f333f4 479#endif
d9bb3666 480
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481void
482cond_broadcast(sv)
483 SV * sv
484 MAGIC * mg = NO_INIT
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485CODE:
486#ifdef USE_THREADS
783070da 487 if (SvROK(sv))
734689b1 488 sv = SvRV(sv);
783070da 489
734689b1 490 mg = condpair_magic(sv);
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491 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
492 thr, sv));
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493 MUTEX_LOCK(MgMUTEXP(mg));
494 if (MgOWNER(mg) != thr) {
495 MUTEX_UNLOCK(MgMUTEXP(mg));
496 croak("cond_broadcast for lock that we don't own\n");
497 }
498 COND_BROADCAST(MgCONDP(mg));
499 MUTEX_UNLOCK(MgMUTEXP(mg));
f0f333f4 500#endif
f152979c 501
7d901afa 502void
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503list(classname)
504 char * classname
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505 PREINIT:
506 Thread t;
507 AV * av;
508 SV ** svp;
509 int n = 0;
510 PPCODE:
f0f333f4 511#ifdef USE_THREADS
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512 av = newAV();
513 /*
514 * Iterate until we have enough dynamic storage for all threads.
515 * We mustn't do any allocation while holding threads_mutex though.
516 */
517 MUTEX_LOCK(&threads_mutex);
518 do {
519 n = nthreads;
520 MUTEX_UNLOCK(&threads_mutex);
521 if (AvFILL(av) < n - 1) {
522 int i = AvFILL(av);
523 for (i = AvFILL(av); i < n - 1; i++) {
524 SV *sv = newSViv(0); /* fill in tid later */
525 sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
526 av_push(av, sv_bless(newRV_noinc(sv),
458fb581 527 gv_stashpv(classname, TRUE)));
50112d62 528
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529 }
530 }
531 MUTEX_LOCK(&threads_mutex);
532 } while (n < nthreads);
50112d62 533 n = nthreads; /* Get the final correct value */
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534
535 /*
536 * At this point, there's enough room to fill in av.
537 * Note that we are holding threads_mutex so the list
538 * won't change out from under us but all the remaining
539 * processing is "fast" (no blocking, malloc etc.)
540 */
541 t = thr;
542 svp = AvARRAY(av);
543 do {
0a00ffdb 544 SV *sv = (SV*)SvRV(*svp);
7d901afa 545 sv_setiv(sv, t->tid);
199100c8 546 SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
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547 SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
548 SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
549 t = t->next;
0a00ffdb 550 svp++;
7d901afa 551 } while (t != thr);
50112d62 552 /* */
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553 MUTEX_UNLOCK(&threads_mutex);
554 /* Truncate any unneeded slots in av */
50112d62 555 av_fill(av, n - 1);
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556 /* Finally, push all the new objects onto the stack and drop av */
557 EXTEND(sp, n);
558 for (svp = AvARRAY(av); n > 0; n--, svp++)
559 PUSHs(*svp);
560 (void)sv_2mortal((SV*)av);
f0f333f4 561#endif
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562
563
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564MODULE = Thread PACKAGE = Thread::Signal
565
566void
567kill_sighandler_thread()
568 PPCODE:
569 write(sig_pipe[0], "\0", 1);
570 PUSHs(&sv_yes);
571
572void
573init_thread_signals()
574 PPCODE:
575 sighandlerp = handle_thread_signal;
576 if (pipe(sig_pipe) == -1)
577 XSRETURN_UNDEF;
578 PUSHs(&sv_yes);
579
580SV *
581await_signal()
582 PREINIT:
583 char c;
ea0efc06 584 SSize_t ret;
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585 CODE:
586 do {
587 ret = read(sig_pipe[1], &c, 1);
588 } while (ret == -1 && errno == EINTR);
589 if (ret == -1)
590 croak("panic: await_signal");
591 if (ret == 0)
592 XSRETURN_UNDEF;
593 RETVAL = c ? psig_ptr[c] : &sv_no;
594 OUTPUT:
595 RETVAL
4e35701f 596
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597MODULE = Thread PACKAGE = Thread::Specific
598
599void
600data(classname = "Thread::Specific")
601 char * classname
602 PPCODE:
fb223100 603#ifdef USE_THREADS
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604 if (AvFILL(thr->specific) == -1) {
605 GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
606 av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
607 }
608 XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));
fb223100 609#endif