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[perl5.git] / ext / threads / shared / shared.xs
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afe38520 1/* shared.xs
68795e93 2 *
afe38520 3 * Copyright (c) 2001-2002, Larry Wall
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4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
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8 * "Hand any two wizards a piece of rope and they would instinctively pull in
9 * opposite directions."
10 * --Sourcery
11 *
12 * Contributed by Arthur Bergman arthur@contiller.se
13 * pulled in the (an)other direction by Nick Ing-Simmons nick@ing-simmons.net
14 */
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15
16#define PERL_NO_GET_CONTEXT
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17#include "EXTERN.h"
18#include "perl.h"
19#include "XSUB.h"
20
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21#ifdef USE_ITHREADS
22
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23#define SHAREDSvPTR(a) ((a)->sv)
24
25/*
26 * The shared things need an intepreter to live in ...
27 */
28PerlInterpreter *PL_sharedsv_space; /* The shared sv space */
29/* To access shared space we fake aTHX in this scope and thread's context */
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DM
30
31/* bug #24255: we include ENTER+SAVETMPS/FREETMPS+LEAVE with
32 * SHARED_CONTEXT/CALLER_CONTEXT macros, so that any mortals etc created
1011f542 33 * while in the shared interpreter context don't languish */
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34
35#define SHARED_CONTEXT \
36 STMT_START { \
37 PERL_SET_CONTEXT((aTHX = PL_sharedsv_space)); \
38 ENTER; \
39 SAVETMPS; \
40 } STMT_END
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41
42/* So we need a way to switch back to the caller's context... */
43/* So we declare _another_ copy of the aTHX variable ... */
44#define dTHXc PerlInterpreter *caller_perl = aTHX
057e91b3 45
21312124 46/* and use it to switch back */
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DM
47#define CALLER_CONTEXT \
48 STMT_START { \
49 FREETMPS; \
50 LEAVE; \
51 PERL_SET_CONTEXT((aTHX = caller_perl)); \
52 } STMT_END
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53
54/*
55 * Only one thread at a time is allowed to mess with shared space.
56 */
a446a88f 57
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58typedef struct
59{
60 perl_mutex mutex;
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61 PerlInterpreter *owner;
62 I32 locks;
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63 perl_cond cond;
64#ifdef DEBUG_LOCKS
65 char * file;
66 int line;
67#endif
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68} recursive_lock_t;
69
70recursive_lock_t PL_sharedsv_lock; /* Mutex protecting the shared sv space */
71
72void
73recursive_lock_init(pTHX_ recursive_lock_t *lock)
74{
75 Zero(lock,1,recursive_lock_t);
76 MUTEX_INIT(&lock->mutex);
77 COND_INIT(&lock->cond);
78}
79
a39edb3a 80void
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81recursive_lock_destroy(pTHX_ recursive_lock_t *lock)
82{
83 MUTEX_DESTROY(&lock->mutex);
84 COND_DESTROY(&lock->cond);
85}
86
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87void
88recursive_lock_release(pTHX_ recursive_lock_t *lock)
89{
90 MUTEX_LOCK(&lock->mutex);
91 if (lock->owner != aTHX) {
92 MUTEX_UNLOCK(&lock->mutex);
93 }
94 else {
95 if (--lock->locks == 0) {
96 lock->owner = NULL;
97 COND_SIGNAL(&lock->cond);
98 }
99 }
100 MUTEX_UNLOCK(&lock->mutex);
101}
a446a88f 102
6d56dc1c 103void
6b85e4fe 104recursive_lock_acquire(pTHX_ recursive_lock_t *lock,char *file,int line)
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NIS
105{
106 assert(aTHX);
107 MUTEX_LOCK(&lock->mutex);
108 if (lock->owner == aTHX) {
109 lock->locks++;
110 }
111 else {
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112 while (lock->owner) {
113#ifdef DEBUG_LOCKS
114 Perl_warn(aTHX_ " %p waiting - owned by %p %s:%d\n",
115 aTHX, lock->owner, lock->file, lock->line);
116#endif
6d56dc1c 117 COND_WAIT(&lock->cond,&lock->mutex);
6b85e4fe 118 }
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119 lock->locks = 1;
120 lock->owner = aTHX;
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121#ifdef DEBUG_LOCKS
122 lock->file = file;
123 lock->line = line;
124#endif
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125 }
126 MUTEX_UNLOCK(&lock->mutex);
6b85e4fe 127 SAVEDESTRUCTOR_X(recursive_lock_release,lock);
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128}
129
130#define ENTER_LOCK STMT_START { \
131 ENTER; \
6b85e4fe 132 recursive_lock_acquire(aTHX_ &PL_sharedsv_lock, __FILE__, __LINE__); \
a446a88f 133 } STMT_END
21312124 134
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135#define LEAVE_LOCK LEAVE
136
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137
138/* A common idiom is to acquire access and switch in ... */
139#define SHARED_EDIT STMT_START { \
6d56dc1c 140 ENTER_LOCK; \
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141 SHARED_CONTEXT; \
142 } STMT_END
143
144/* then switch out and release access. */
145#define SHARED_RELEASE STMT_START { \
146 CALLER_CONTEXT; \
6d56dc1c 147 LEAVE_LOCK; \
21312124 148 } STMT_END
85e0a142 149
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150
151/*
152
153 Shared SV
154
155 Shared SV is a structure for keeping the backend storage
156 of shared svs.
157
158 Shared-ness really only needs the SV * - the rest is for locks.
159 (Which suggests further space optimization ... )
160
161*/
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162
163typedef struct {
21312124 164 SV *sv; /* The actual SV - in shared space */
6d56dc1c 165 recursive_lock_t lock;
68795e93 166 perl_cond user_cond; /* For user-level conditions */
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167} shared_sv;
168
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169/* The SV in shared-space has a back-pointer to the shared_sv
170 struct associated with it PERL_MAGIC_ext.
68795e93 171
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172 The vtable used has just one entry - when the SV goes away
173 we free the memory for the above.
68795e93 174
21312124 175 */
68795e93 176
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177int
178sharedsv_shared_mg_free(pTHX_ SV *sv, MAGIC *mg)
179{
180 shared_sv *shared = (shared_sv *) mg->mg_ptr;
6b85e4fe 181 assert( aTHX == PL_sharedsv_space );
21312124 182 if (shared) {
cab6ddb1 183 recursive_lock_destroy(aTHX_ &shared->lock);
579f9913 184 COND_DESTROY(&shared->user_cond);
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185 PerlMemShared_free(shared);
186 mg->mg_ptr = NULL;
187 }
188 return 0;
189}
190
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191MGVTBL sharedsv_shared_vtbl = {
192 0, /* get */
193 0, /* set */
194 0, /* len */
195 0, /* clear */
196 sharedsv_shared_mg_free, /* free */
197 0, /* copy */
198 0, /* dup */
199};
200
201/* Access to shared things is heavily based on MAGIC - in mg.h/mg.c/sv.c sense */
202
203/* In any thread that has access to a shared thing there is a "proxy"
204 for it in its own space which has 'MAGIC' associated which accesses
205 the shared thing.
206 */
207
208MGVTBL sharedsv_scalar_vtbl; /* scalars have this vtable */
209MGVTBL sharedsv_array_vtbl; /* hashes and arrays have this - like 'tie' */
210MGVTBL sharedsv_elem_vtbl; /* elements of hashes and arrays have this
211 _AS WELL AS_ the scalar magic */
212
213/* The sharedsv_elem_vtbl associates the element with the array/hash and
214 the sharedsv_scalar_vtbl associates it with the value
215 */
216
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217
218/* Accessor to convert threads::shared::tie objects back shared_sv * */
219shared_sv *
220SV_to_sharedsv(pTHX_ SV *sv)
221{
222 shared_sv *shared = 0;
223 if (SvROK(sv))
224 {
225 shared = INT2PTR(shared_sv *, SvIV(SvRV(sv)));
226 }
227 return shared;
228}
229
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230=for apidoc sharedsv_find
231
6b85e4fe 232Given a private side SV tries to find if the SV has a shared backend,
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233by looking for the magic.
234
235=cut
236
237shared_sv *
238Perl_sharedsv_find(pTHX_ SV *sv)
239{
240 MAGIC *mg;
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NIS
241 if (SvTYPE(sv) >= SVt_PVMG) {
242 switch(SvTYPE(sv)) {
243 case SVt_PVAV:
244 case SVt_PVHV:
245 if ((mg = mg_find(sv, PERL_MAGIC_tied))
246 && mg->mg_virtual == &sharedsv_array_vtbl) {
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247 return (shared_sv *) mg->mg_ptr;
248 }
249 break;
a446a88f 250 default:
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251 /* This should work for elements as well as they
252 * have scalar magic as well as their element magic
253 */
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254 if ((mg = mg_find(sv, PERL_MAGIC_shared_scalar))
255 && mg->mg_virtual == &sharedsv_scalar_vtbl) {
21312124 256 return (shared_sv *) mg->mg_ptr;
6b85e4fe 257 }
a446a88f 258 break;
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259 }
260 }
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261 /* Just for tidyness of API also handle tie objects */
262 if (SvROK(sv) && sv_derived_from(sv, "threads::shared::tie")) {
263 return SV_to_sharedsv(aTHX_ sv);
264 }
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265 return NULL;
266}
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267
268/*
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269 * Almost all the pain is in this routine.
270 *
271 */
68795e93 272
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273shared_sv *
274Perl_sharedsv_associate(pTHX_ SV **psv, SV *ssv, shared_sv *data)
275{
21312124 276 dTHXc;
a446a88f 277 MAGIC *mg = 0;
6b85e4fe 278 SV *sv = (psv) ? *psv : Nullsv;
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279
280 /* If we are asked for an private ops we need a thread */
281 assert ( aTHX != PL_sharedsv_space );
282
283 /* To avoid need for recursive locks require caller to hold lock */
6d56dc1c 284 assert ( PL_sharedsv_lock.owner == aTHX );
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285
286 /* First try and get existing global data structure */
68795e93 287
21312124 288 /* Try shared SV as 1st choice */
a446a88f 289 if (!data && ssv && SvTYPE(ssv) >= SVt_PVMG) {
436c6dd3 290 if( (mg = mg_find(ssv, PERL_MAGIC_ext)) ){
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291 data = (shared_sv *) mg->mg_ptr;
292 }
293 }
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294
295 /* Next see if private SV is associated with something */
296 if (!data && sv) {
297 data = Perl_sharedsv_find(aTHX_ sv);
21312124 298 }
6b85e4fe 299
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300 /* If neither of those then create a new one */
301 if (!data) {
6b85e4fe 302 SHARED_CONTEXT;
b0cd0593 303 if (!ssv) {
6b85e4fe 304 ssv = newSV(0);
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AB
305 SvREFCNT(ssv) = 0;
306 }
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307 data = PerlMemShared_malloc(sizeof(shared_sv));
308 Zero(data,1,shared_sv);
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309 SHAREDSvPTR(data) = ssv;
310 /* Tag shared side SV with data pointer */
311 sv_magicext(ssv, ssv, PERL_MAGIC_ext, &sharedsv_shared_vtbl,
312 (char *)data, 0);
6d56dc1c 313 recursive_lock_init(aTHX_ &data->lock);
21312124 314 COND_INIT(&data->user_cond);
6b85e4fe 315 CALLER_CONTEXT;
21312124 316 }
68795e93 317
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318 if (!ssv)
319 ssv = SHAREDSvPTR(data);
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320 if (!SHAREDSvPTR(data))
321 SHAREDSvPTR(data) = ssv;
322
323 /* If we know type upgrade shared side SV */
324 if (sv && SvTYPE(ssv) < SvTYPE(sv)) {
21312124 325 SHARED_CONTEXT;
21312124 326 sv_upgrade(ssv, SvTYPE(*psv));
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DM
327 if (SvTYPE(ssv) == SVt_PVAV) /* #24061 */
328 AvREAL_on(ssv);
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329 CALLER_CONTEXT;
330 }
68795e93 331
21312124 332 /* Now if requested allocate private SV */
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333 if (psv && !sv) {
334 *psv = sv = newSV(0);
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335 }
336
337 /* Finally if private SV exists check and add magic */
6b85e4fe 338 if (sv) {
a446a88f 339 MAGIC *mg = 0;
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340 if (SvTYPE(sv) < SvTYPE(ssv)) {
341 sv_upgrade(sv, SvTYPE(ssv));
342 }
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343 switch(SvTYPE(sv)) {
344 case SVt_PVAV:
345 case SVt_PVHV:
346 if (!(mg = mg_find(sv, PERL_MAGIC_tied))
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347 || mg->mg_virtual != &sharedsv_array_vtbl
348 || (shared_sv *) mg->mg_ptr != data) {
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349 SV *obj = newSV(0);
350 sv_setref_iv(obj, "threads::shared::tie",PTR2IV(data));
6b85e4fe 351 if (mg) {
21312124 352 sv_unmagic(sv, PERL_MAGIC_tied);
6b85e4fe 353 }
a446a88f 354 mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl,
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355 (char *) data, 0);
356 mg->mg_flags |= (MGf_COPY|MGf_DUP);
6b85e4fe 357 SvREFCNT_inc(ssv);
a446a88f 358 SvREFCNT_dec(obj);
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AB
359 if(SvOBJECT(ssv)) {
360 STRLEN len;
361 char* stash_ptr = SvPV((SV*) SvSTASH(ssv), len);
362 HV* stash = gv_stashpvn(stash_ptr, len, TRUE);
363 SvOBJECT_on(sv);
364 SvSTASH(sv) = (HV*)SvREFCNT_inc(stash);
365 }
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366 }
367 break;
368
369 default:
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370 if ((SvTYPE(sv) < SVt_PVMG)
371 || !(mg = mg_find(sv, PERL_MAGIC_shared_scalar))
372 || mg->mg_virtual != &sharedsv_scalar_vtbl
373 || (shared_sv *) mg->mg_ptr != data) {
374 if (mg) {
21312124 375 sv_unmagic(sv, PERL_MAGIC_shared_scalar);
6b85e4fe 376 }
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377 mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar,
378 &sharedsv_scalar_vtbl, (char *)data, 0);
379 mg->mg_flags |= (MGf_COPY|MGf_DUP);
6b85e4fe 380 SvREFCNT_inc(ssv);
21312124
NIS
381 }
382 break;
383 }
6d56dc1c 384 assert ( Perl_sharedsv_find(aTHX_ *psv) == data );
21312124 385 }
21312124
NIS
386 return data;
387}
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388
389void
21312124 390Perl_sharedsv_free(pTHX_ shared_sv *shared)
68795e93 391{
21312124
NIS
392 if (shared) {
393 dTHXc;
394 SHARED_EDIT;
395 SvREFCNT_dec(SHAREDSvPTR(shared));
396 SHARED_RELEASE;
397 }
68795e93
NIS
398}
399
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400void
401Perl_sharedsv_share(pTHX_ SV *sv)
402{
403 switch(SvTYPE(sv)) {
404 case SVt_PVGV:
405 Perl_croak(aTHX_ "Cannot share globs yet");
406 break;
407
408 case SVt_PVCV:
409 Perl_croak(aTHX_ "Cannot share subs yet");
410 break;
85e0a142 411
21312124 412 default:
6d56dc1c 413 ENTER_LOCK;
21312124 414 Perl_sharedsv_associate(aTHX_ &sv, 0, 0);
6d56dc1c 415 LEAVE_LOCK;
a446a88f
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416 SvSETMAGIC(sv);
417 break;
21312124
NIS
418 }
419}
68795e93 420
a0e036c1
MP
421#if defined(WIN32) || defined(OS2)
422# define ABS2RELMILLI(abs) \
423 do { \
2666606c 424 abs -= (double)time(NULL); \
a0e036c1
MP
425 if (abs > 0) { abs *= 1000; } \
426 else { abs = 0; } \
427 } while (0)
428#endif /* WIN32 || OS2 */
429
430bool
431Perl_sharedsv_cond_timedwait(perl_cond *cond, perl_mutex *mut, double abs)
432{
433#if defined(NETWARE) || defined(FAKE_THREADS) || defined(I_MACH_CTHREADS)
434 Perl_croak_nocontext("cond_timedwait not supported on this platform");
435#else
436# ifdef WIN32
437 int got_it = 0;
438
439 ABS2RELMILLI(abs);
440
441 cond->waiters++;
442 MUTEX_UNLOCK(mut);
443 /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */
028f8eaa 444 switch (WaitForSingleObject(cond->sem, (DWORD)abs)) {
a0e036c1
MP
445 case WAIT_OBJECT_0: got_it = 1; break;
446 case WAIT_TIMEOUT: break;
447 default:
448 /* WAIT_FAILED? WAIT_ABANDONED? others? */
449 Perl_croak_nocontext("panic: cond_timedwait (%ld)",GetLastError());
450 break;
451 }
452 MUTEX_LOCK(mut);
2666606c 453 cond->waiters--;
a0e036c1
MP
454 return got_it;
455# else
456# ifdef OS2
457 int rc, got_it = 0;
458 STRLEN n_a;
459
460 ABS2RELMILLI(abs);
461
462 if ((rc = DosResetEventSem(*cond,&n_a)) && (rc != ERROR_ALREADY_RESET))
463 Perl_rc = rc, croak_with_os2error("panic: cond_timedwait-reset");
464 MUTEX_UNLOCK(mut);
465 if (CheckOSError(DosWaitEventSem(*cond,abs))
466 && (rc != ERROR_INTERRUPT))
467 croak_with_os2error("panic: cond_timedwait");
468 if (rc == ERROR_INTERRUPT) errno = EINTR;
469 MUTEX_LOCK(mut);
470 return got_it;
471# else /* hope you're I_PTHREAD! */
472 struct timespec ts;
473 int got_it = 0;
474
475 ts.tv_sec = (long)abs;
476 abs -= (NV)ts.tv_sec;
477 ts.tv_nsec = (long)(abs * 1000000000.0);
478
479 switch (pthread_cond_timedwait(cond, mut, &ts)) {
480 case 0: got_it = 1; break;
481 case ETIMEDOUT: break;
482 default:
483 Perl_croak_nocontext("panic: cond_timedwait");
484 break;
485 }
486 return got_it;
487# endif /* OS2 */
488# endif /* WIN32 */
489#endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */
490}
491
21312124 492/* MAGIC (in mg.h sense) hooks */
68795e93 493
21312124
NIS
494int
495sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg)
68795e93 496{
21312124 497 shared_sv *shared = (shared_sv *) mg->mg_ptr;
6b85e4fe 498 assert(shared);
21312124 499
6d56dc1c 500 ENTER_LOCK;
21312124
NIS
501 if (SHAREDSvPTR(shared)) {
502 if (SvROK(SHAREDSvPTR(shared))) {
a446a88f
NIS
503 SV *obj = Nullsv;
504 Perl_sharedsv_associate(aTHX_ &obj, SvRV(SHAREDSvPTR(shared)), NULL);
505 sv_setsv_nomg(sv, &PL_sv_undef);
506 SvRV(sv) = obj;
507 SvROK_on(sv);
5c360ac5 508
21312124
NIS
509 }
510 else {
a446a88f 511 sv_setsv_nomg(sv, SHAREDSvPTR(shared));
21312124
NIS
512 }
513 }
6d56dc1c 514 LEAVE_LOCK;
21312124
NIS
515 return 0;
516}
517
6b85e4fe
NIS
518void
519sharedsv_scalar_store(pTHX_ SV *sv, shared_sv *shared)
21312124
NIS
520{
521 dTHXc;
21312124 522 bool allowed = TRUE;
21312124
NIS
523 if (SvROK(sv)) {
524 shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(sv));
525 if (target) {
a446a88f
NIS
526 SV *tmp;
527 SHARED_CONTEXT;
528 tmp = newRV(SHAREDSvPTR(target));
529 sv_setsv_nomg(SHAREDSvPTR(shared), tmp);
21312124 530 SvREFCNT_dec(tmp);
5c360ac5
AB
531 if(SvOBJECT(SvRV(sv))) {
532 SV* fake_stash = newSVpv(HvNAME(SvSTASH(SvRV(sv))),0);
533 SvOBJECT_on(SHAREDSvPTR(target));
534 SvSTASH(SHAREDSvPTR(target)) = (HV*)fake_stash;
535 }
a446a88f 536 CALLER_CONTEXT;
21312124
NIS
537 }
538 else {
539 allowed = FALSE;
540 }
541 }
542 else {
5c360ac5 543 SvTEMP_off(sv);
a446a88f
NIS
544 SHARED_CONTEXT;
545 sv_setsv_nomg(SHAREDSvPTR(shared), sv);
5c360ac5
AB
546 if(SvOBJECT(sv)) {
547 SV* fake_stash = newSVpv(HvNAME(SvSTASH(sv)),0);
548 SvOBJECT_on(SHAREDSvPTR(shared));
549 SvSTASH(SHAREDSvPTR(shared)) = (HV*)fake_stash;
550 }
a446a88f 551 CALLER_CONTEXT;
21312124 552 }
21312124
NIS
553 if (!allowed) {
554 Perl_croak(aTHX_ "Invalid value for shared scalar");
555 }
6b85e4fe
NIS
556}
557
558int
559sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg)
560{
561 shared_sv *shared;
562 ENTER_LOCK;
563 /* We call associate to potentially upgrade shared side SV */
564 shared = Perl_sharedsv_associate(aTHX_ &sv, Nullsv, (shared_sv *) mg->mg_ptr);
565 assert(shared);
566 sharedsv_scalar_store(aTHX_ sv, shared);
567 LEAVE_LOCK;
21312124 568 return 0;
68795e93
NIS
569}
570
21312124
NIS
571int
572sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg)
573{
a446a88f 574 shared_sv *shared = (shared_sv *) mg->mg_ptr;
eb31b78e 575#if 0
a446a88f 576 assert (SvREFCNT(SHAREDSvPTR(shared)) < 1000);
eb31b78e 577#endif
a446a88f
NIS
578 Perl_sharedsv_free(aTHX_ shared);
579 return 0;
580}
581
582int
583sharedsv_scalar_mg_clear(pTHX_ SV *sv, MAGIC *mg)
584{
21312124
NIS
585 return 0;
586}
68795e93
NIS
587
588/*
21312124
NIS
589 * Called during cloning of new threads
590 */
591int
592sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
593{
594 shared_sv *shared = (shared_sv *) mg->mg_ptr;
595 if (shared) {
596 SvREFCNT_inc(SHAREDSvPTR(shared));
597 }
598 return 0;
599}
68795e93 600
21312124
NIS
601MGVTBL sharedsv_scalar_vtbl = {
602 sharedsv_scalar_mg_get, /* get */
603 sharedsv_scalar_mg_set, /* set */
604 0, /* len */
a446a88f 605 sharedsv_scalar_mg_clear, /* clear */
21312124
NIS
606 sharedsv_scalar_mg_free, /* free */
607 0, /* copy */
608 sharedsv_scalar_mg_dup /* dup */
609};
68795e93 610
21312124 611/* Now the arrays/hashes stuff */
21312124
NIS
612int
613sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg)
68795e93 614{
21312124 615 dTHXc;
6b85e4fe 616 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
21312124
NIS
617 shared_sv *target = Perl_sharedsv_find(aTHX_ sv);
618 SV** svp;
619
a446a88f
NIS
620 assert ( shared );
621 assert ( SHAREDSvPTR(shared) );
622
6b85e4fe 623 ENTER_LOCK;
21312124 624 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
a446a88f 625 assert ( mg->mg_ptr == 0 );
6b85e4fe 626 SHARED_CONTEXT;
a446a88f 627 svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 0);
21312124
NIS
628 }
629 else {
6b85e4fe
NIS
630 char *key = mg->mg_ptr;
631 STRLEN len = mg->mg_len;
a446a88f 632 assert ( mg->mg_ptr != 0 );
6b85e4fe
NIS
633 if (mg->mg_len == HEf_SVKEY) {
634 key = SvPV((SV *) mg->mg_ptr, len);
635 }
636 SHARED_CONTEXT;
637 svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 0);
21312124 638 }
6b85e4fe 639 CALLER_CONTEXT;
21312124 640 if (svp) {
6b85e4fe
NIS
641 /* Exists in the array */
642 target = Perl_sharedsv_associate(aTHX_ &sv, *svp, target);
643 sv_setsv(sv, *svp);
21312124 644 }
6b85e4fe
NIS
645 else {
646 /* Not in the array */
647 sv_setsv(sv, &PL_sv_undef);
68795e93 648 }
6b85e4fe 649 LEAVE_LOCK;
21312124 650 return 0;
68795e93
NIS
651}
652
21312124
NIS
653int
654sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg)
655{
656 dTHXc;
6b85e4fe 657 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
a446a88f 658 shared_sv *target;
6b85e4fe 659 SV **svp;
21312124
NIS
660 /* Theory - SV itself is magically shared - and we have ordered the
661 magic such that by the time we get here it has been stored
662 to its shared counterpart
663 */
6d56dc1c
NIS
664 ENTER_LOCK;
665 assert(shared);
666 assert(SHAREDSvPTR(shared));
21312124 667 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
6b85e4fe
NIS
668 assert ( mg->mg_ptr == 0 );
669 SHARED_CONTEXT;
670 svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 1);
21312124
NIS
671 }
672 else {
6b85e4fe
NIS
673 char *key = mg->mg_ptr;
674 STRLEN len = mg->mg_len;
675 assert ( mg->mg_ptr != 0 );
676 if (mg->mg_len == HEf_SVKEY)
677 key = SvPV((SV *) mg->mg_ptr, len);
678 SHARED_CONTEXT;
679 svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 1);
21312124 680 }
6b85e4fe
NIS
681 CALLER_CONTEXT;
682 target = Perl_sharedsv_associate(aTHX_ &sv, *svp, 0);
683 sharedsv_scalar_store(aTHX_ sv, target);
684 LEAVE_LOCK;
21312124
NIS
685 return 0;
686}
68795e93 687
21312124
NIS
688int
689sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg)
68795e93 690{
21312124 691 dTHXc;
057e91b3 692 MAGIC *shmg;
6b85e4fe 693 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
6b85e4fe
NIS
694 ENTER_LOCK;
695 sharedsv_elem_mg_FETCH(aTHX_ sv, mg);
057e91b3
DM
696 if ((shmg = mg_find(sv, PERL_MAGIC_shared_scalar)))
697 sharedsv_scalar_mg_get(aTHX_ sv, shmg);
21312124 698 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
6b85e4fe
NIS
699 SHARED_CONTEXT;
700 av_delete((AV*) SHAREDSvPTR(shared), mg->mg_len, G_DISCARD);
68795e93 701 }
21312124 702 else {
6b85e4fe
NIS
703 char *key = mg->mg_ptr;
704 STRLEN len = mg->mg_len;
705 assert ( mg->mg_ptr != 0 );
706 if (mg->mg_len == HEf_SVKEY)
707 key = SvPV((SV *) mg->mg_ptr, len);
708 SHARED_CONTEXT;
709 hv_delete((HV*) SHAREDSvPTR(shared), key, len, G_DISCARD);
21312124 710 }
6b85e4fe
NIS
711 CALLER_CONTEXT;
712 LEAVE_LOCK;
21312124
NIS
713 return 0;
714}
715
21312124
NIS
716int
717sharedsv_elem_mg_free(pTHX_ SV *sv, MAGIC *mg)
718{
6b85e4fe 719 Perl_sharedsv_free(aTHX_ SV_to_sharedsv(aTHX_ mg->mg_obj));
21312124
NIS
720 return 0;
721}
722
723int
724sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
725{
6b85e4fe 726 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
21312124
NIS
727 SvREFCNT_inc(SHAREDSvPTR(shared));
728 mg->mg_flags |= MGf_DUP;
729 return 0;
730}
731
732MGVTBL sharedsv_elem_vtbl = {
733 sharedsv_elem_mg_FETCH, /* get */
734 sharedsv_elem_mg_STORE, /* set */
735 0, /* len */
736 sharedsv_elem_mg_DELETE, /* clear */
737 sharedsv_elem_mg_free, /* free */
738 0, /* copy */
739 sharedsv_elem_mg_dup /* dup */
740};
741
742U32
743sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg)
744{
745 dTHXc;
746 shared_sv *shared = (shared_sv *) mg->mg_ptr;
747 U32 val;
748 SHARED_EDIT;
749 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
750 val = av_len((AV*) SHAREDSvPTR(shared));
751 }
752 else {
753 /* not actually defined by tie API but ... */
754 val = HvKEYS((HV*) SHAREDSvPTR(shared));
755 }
756 SHARED_RELEASE;
757 return val;
758}
759
760int
761sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg)
762{
763 dTHXc;
764 shared_sv *shared = (shared_sv *) mg->mg_ptr;
765 SHARED_EDIT;
766 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
767 av_clear((AV*) SHAREDSvPTR(shared));
768 }
769 else {
770 hv_clear((HV*) SHAREDSvPTR(shared));
771 }
772 SHARED_RELEASE;
773 return 0;
774}
775
776int
777sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg)
778{
779 Perl_sharedsv_free(aTHX_ (shared_sv *) mg->mg_ptr);
780 return 0;
68795e93
NIS
781}
782
783/*
21312124
NIS
784 * This is called when perl is about to access an element of
785 * the array -
786 */
787int
788sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg,
789 SV *nsv, const char *name, int namlen)
790{
791 shared_sv *shared = (shared_sv *) mg->mg_ptr;
792 MAGIC *nmg = sv_magicext(nsv,mg->mg_obj,
793 toLOWER(mg->mg_type),&sharedsv_elem_vtbl,
794 name, namlen);
b747d46a 795 ENTER_LOCK;
a446a88f 796 SvREFCNT_inc(SHAREDSvPTR(shared));
b747d46a 797 LEAVE_LOCK;
21312124 798 nmg->mg_flags |= MGf_DUP;
21312124
NIS
799 return 1;
800}
801
802int
803sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
804{
805 shared_sv *shared = (shared_sv *) mg->mg_ptr;
806 SvREFCNT_inc(SHAREDSvPTR(shared));
807 mg->mg_flags |= MGf_DUP;
808 return 0;
809}
810
811MGVTBL sharedsv_array_vtbl = {
812 0, /* get */
813 0, /* set */
814 sharedsv_array_mg_FETCHSIZE, /* len */
815 sharedsv_array_mg_CLEAR, /* clear */
816 sharedsv_array_mg_free, /* free */
817 sharedsv_array_mg_copy, /* copy */
818 sharedsv_array_mg_dup /* dup */
819};
820
821=for apidoc sharedsv_unlock
68795e93
NIS
822
823Recursively unlocks a shared sv.
824
21312124 825=cut
68795e93
NIS
826
827void
828Perl_sharedsv_unlock(pTHX_ shared_sv* ssv)
829{
6d56dc1c 830 recursive_lock_release(aTHX_ &ssv->lock);
68795e93
NIS
831}
832
21312124 833=for apidoc sharedsv_lock
68795e93 834
21312124
NIS
835Recursive locks on a sharedsv.
836Locks are dynamically scoped at the level of the first lock.
68795e93 837
21312124 838=cut
68795e93
NIS
839
840void
21312124 841Perl_sharedsv_lock(pTHX_ shared_sv* ssv)
68795e93 842{
21312124
NIS
843 if (!ssv)
844 return;
6b85e4fe 845 recursive_lock_acquire(aTHX_ &ssv->lock, __FILE__, __LINE__);
68795e93
NIS
846}
847
afe38520
DM
848/* handles calls from lock() builtin via PL_lockhook */
849
21312124
NIS
850void
851Perl_sharedsv_locksv(pTHX_ SV *sv)
852{
afe38520
DM
853 shared_sv* shared;
854
855 if(SvROK(sv))
856 sv = SvRV(sv);
38875929 857 shared = Perl_sharedsv_find(aTHX_ sv);
afe38520
DM
858 if(!shared)
859 croak("lock can only be used on shared values");
860 Perl_sharedsv_lock(aTHX_ shared);
b050c948
AB
861}
862
21312124 863=head1 Shared SV Functions
b050c948 864
21312124 865=for apidoc sharedsv_init
b050c948 866
21312124 867Saves a space for keeping SVs wider than an interpreter,
b050c948 868
21312124
NIS
869=cut
870
871void
872Perl_sharedsv_init(pTHX)
873{
874 dTHXc;
875 /* This pair leaves us in shared context ... */
876 PL_sharedsv_space = perl_alloc();
877 perl_construct(PL_sharedsv_space);
878 CALLER_CONTEXT;
6d56dc1c 879 recursive_lock_init(aTHX_ &PL_sharedsv_lock);
21312124
NIS
880 PL_lockhook = &Perl_sharedsv_locksv;
881 PL_sharehook = &Perl_sharedsv_share;
b050c948
AB
882}
883
73e09c8f
JH
884#endif /* USE_ITHREADS */
885
21312124 886MODULE = threads::shared PACKAGE = threads::shared::tie
b050c948 887
21312124 888PROTOTYPES: DISABLE
b050c948 889
73e09c8f 890#ifdef USE_ITHREADS
6b85e4fe 891
21312124
NIS
892void
893PUSH(shared_sv *shared, ...)
894CODE:
895 dTHXc;
896 int i;
21312124
NIS
897 for(i = 1; i < items; i++) {
898 SV* tmp = newSVsv(ST(i));
a446a88f 899 shared_sv *target;
6d56dc1c 900 ENTER_LOCK;
a446a88f 901 target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
6b85e4fe 902 sharedsv_scalar_store(aTHX_ tmp, target);
21312124
NIS
903 SHARED_CONTEXT;
904 av_push((AV*) SHAREDSvPTR(shared), SHAREDSvPTR(target));
b0cd0593 905 SvREFCNT_inc(SHAREDSvPTR(target));
a446a88f 906 SHARED_RELEASE;
21312124
NIS
907 SvREFCNT_dec(tmp);
908 }
b050c948 909
21312124
NIS
910void
911UNSHIFT(shared_sv *shared, ...)
912CODE:
913 dTHXc;
914 int i;
6d56dc1c 915 ENTER_LOCK;
21312124
NIS
916 SHARED_CONTEXT;
917 av_unshift((AV*)SHAREDSvPTR(shared), items - 1);
918 CALLER_CONTEXT;
919 for(i = 1; i < items; i++) {
920 SV* tmp = newSVsv(ST(i));
921 shared_sv *target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
6b85e4fe 922 sharedsv_scalar_store(aTHX_ tmp, target);
21312124
NIS
923 SHARED_CONTEXT;
924 av_store((AV*) SHAREDSvPTR(shared), i - 1, SHAREDSvPTR(target));
b0cd0593 925 SvREFCNT_inc(SHAREDSvPTR(target));
21312124
NIS
926 CALLER_CONTEXT;
927 SvREFCNT_dec(tmp);
928 }
6d56dc1c 929 LEAVE_LOCK;
b050c948 930
21312124
NIS
931void
932POP(shared_sv *shared)
933CODE:
934 dTHXc;
935 SV* sv;
6d56dc1c 936 ENTER_LOCK;
21312124
NIS
937 SHARED_CONTEXT;
938 sv = av_pop((AV*)SHAREDSvPTR(shared));
939 CALLER_CONTEXT;
9b018978 940 ST(0) = sv_newmortal();
21312124 941 Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
9b018978 942 SvREFCNT_dec(sv);
6d56dc1c 943 LEAVE_LOCK;
21312124 944 XSRETURN(1);
b050c948 945
21312124
NIS
946void
947SHIFT(shared_sv *shared)
948CODE:
949 dTHXc;
950 SV* sv;
6d56dc1c 951 ENTER_LOCK;
21312124
NIS
952 SHARED_CONTEXT;
953 sv = av_shift((AV*)SHAREDSvPTR(shared));
954 CALLER_CONTEXT;
9b018978 955 ST(0) = sv_newmortal();
21312124 956 Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
9b018978 957 SvREFCNT_dec(sv);
6d56dc1c 958 LEAVE_LOCK;
21312124 959 XSRETURN(1);
b050c948 960
21312124
NIS
961void
962EXTEND(shared_sv *shared, IV count)
963CODE:
964 dTHXc;
965 SHARED_EDIT;
966 av_extend((AV*)SHAREDSvPTR(shared), count);
967 SHARED_RELEASE;
b050c948 968
21312124 969void
6b85e4fe
NIS
970STORESIZE(shared_sv *shared,IV count)
971CODE:
972 dTHXc;
973 SHARED_EDIT;
974 av_fill((AV*) SHAREDSvPTR(shared), count);
975 SHARED_RELEASE;
976
977
978
979
980void
21312124
NIS
981EXISTS(shared_sv *shared, SV *index)
982CODE:
983 dTHXc;
984 bool exists;
21312124 985 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
680c9d89 986 SHARED_EDIT;
21312124
NIS
987 exists = av_exists((AV*) SHAREDSvPTR(shared), SvIV(index));
988 }
989 else {
6b85e4fe
NIS
990 STRLEN len;
991 char *key = SvPV(index,len);
680c9d89 992 SHARED_EDIT;
6b85e4fe 993 exists = hv_exists((HV*) SHAREDSvPTR(shared), key, len);
21312124
NIS
994 }
995 SHARED_RELEASE;
996 ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no;
997 XSRETURN(1);
b050c948
AB
998
999
1000void
21312124
NIS
1001FIRSTKEY(shared_sv *shared)
1002CODE:
1003 dTHXc;
1004 char* key = NULL;
1005 I32 len = 0;
1006 HE* entry;
6d56dc1c 1007 ENTER_LOCK;
21312124
NIS
1008 SHARED_CONTEXT;
1009 hv_iterinit((HV*) SHAREDSvPTR(shared));
1010 entry = hv_iternext((HV*) SHAREDSvPTR(shared));
1011 if (entry) {
1012 key = hv_iterkey(entry,&len);
1013 CALLER_CONTEXT;
1014 ST(0) = sv_2mortal(newSVpv(key, len));
1015 } else {
1016 CALLER_CONTEXT;
1017 ST(0) = &PL_sv_undef;
1018 }
6d56dc1c 1019 LEAVE_LOCK;
21312124 1020 XSRETURN(1);
b050c948 1021
866fba46 1022void
21312124
NIS
1023NEXTKEY(shared_sv *shared, SV *oldkey)
1024CODE:
1025 dTHXc;
1026 char* key = NULL;
1027 I32 len = 0;
1028 HE* entry;
6d56dc1c 1029 ENTER_LOCK;
21312124
NIS
1030 SHARED_CONTEXT;
1031 entry = hv_iternext((HV*) SHAREDSvPTR(shared));
6b85e4fe 1032 if (entry) {
21312124
NIS
1033 key = hv_iterkey(entry,&len);
1034 CALLER_CONTEXT;
1035 ST(0) = sv_2mortal(newSVpv(key, len));
1036 } else {
1037 CALLER_CONTEXT;
1038 ST(0) = &PL_sv_undef;
1039 }
6d56dc1c 1040 LEAVE_LOCK;
21312124
NIS
1041 XSRETURN(1);
1042
1043MODULE = threads::shared PACKAGE = threads::shared
1044
1045PROTOTYPES: ENABLE
866fba46 1046
68795e93 1047void
9c4972d9
NIS
1048_id(SV *ref)
1049 PROTOTYPE: \[$@%]
1050CODE:
1051 shared_sv *shared;
afe38520 1052 ref = SvRV(ref);
9c4972d9
NIS
1053 if(SvROK(ref))
1054 ref = SvRV(ref);
436c6dd3 1055 if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
9c4972d9
NIS
1056 ST(0) = sv_2mortal(newSViv(PTR2IV(shared)));
1057 XSRETURN(1);
1058 }
1059 XSRETURN_UNDEF;
1060
1061
1062void
6b85e4fe 1063_refcnt(SV *ref)
a446a88f
NIS
1064 PROTOTYPE: \[$@%]
1065CODE:
1066 shared_sv *shared;
afe38520 1067 ref = SvRV(ref);
a446a88f
NIS
1068 if(SvROK(ref))
1069 ref = SvRV(ref);
436c6dd3 1070 if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
a446a88f
NIS
1071 if (SHAREDSvPTR(shared)) {
1072 ST(0) = sv_2mortal(newSViv(SvREFCNT(SHAREDSvPTR(shared))));
1073 XSRETURN(1);
1074 }
1075 else {
436c6dd3 1076 Perl_warn(aTHX_ "%" SVf " s=%p has no shared SV",ST(0),shared);
a446a88f
NIS
1077 }
1078 }
1079 else {
436c6dd3 1080 Perl_warn(aTHX_ "%" SVf " is not shared",ST(0));
a446a88f
NIS
1081 }
1082 XSRETURN_UNDEF;
1083
caf25f3b 1084SV*
a446a88f
NIS
1085share(SV *ref)
1086 PROTOTYPE: \[$@%]
1087 CODE:
56fcff86
AB
1088 if(!SvROK(ref))
1089 Perl_croak(aTHX_ "Argument to share needs to be passed as ref");
afe38520 1090 ref = SvRV(ref);
a446a88f
NIS
1091 if(SvROK(ref))
1092 ref = SvRV(ref);
38875929 1093 Perl_sharedsv_share(aTHX_ ref);
caf25f3b
AB
1094 RETVAL = newRV(ref);
1095 OUTPUT:
1096 RETVAL
a446a88f
NIS
1097
1098void
21312124 1099lock_enabled(SV *ref)
ce127893 1100 PROTOTYPE: \[$@%]
6f942b98
AB
1101 CODE:
1102 shared_sv* shared;
56fcff86
AB
1103 if(!SvROK(ref))
1104 Perl_croak(aTHX_ "Argument to lock needs to be passed as ref");
afe38520 1105 ref = SvRV(ref);
6f942b98
AB
1106 if(SvROK(ref))
1107 ref = SvRV(ref);
38875929 1108 shared = Perl_sharedsv_find(aTHX_ ref);
21312124
NIS
1109 if(!shared)
1110 croak("lock can only be used on shared values");
1111 Perl_sharedsv_lock(aTHX_ shared);
6f942b98
AB
1112
1113void
a0e036c1
MP
1114cond_wait_enabled(SV *ref_cond, SV *ref_lock = 0)
1115 PROTOTYPE: \[$@%];\[$@%]
1116 PREINIT:
6f942b98 1117 shared_sv* shared;
a0e036c1 1118 perl_cond* user_condition;
6f942b98 1119 int locks;
a0e036c1
MP
1120 int same = 0;
1121
1122 CODE:
1123 if (!ref_lock || ref_lock == ref_cond) same = 1;
1124
1125 if(!SvROK(ref_cond))
56fcff86 1126 Perl_croak(aTHX_ "Argument to cond_wait needs to be passed as ref");
a0e036c1
MP
1127 ref_cond = SvRV(ref_cond);
1128 if(SvROK(ref_cond))
1129 ref_cond = SvRV(ref_cond);
1130 shared = Perl_sharedsv_find(aTHX_ ref_cond);
6f942b98
AB
1131 if(!shared)
1132 croak("cond_wait can only be used on shared values");
a0e036c1
MP
1133
1134 user_condition = &shared->user_cond;
1135 if (! same) {
1136 if (!SvROK(ref_lock))
1137 Perl_croak(aTHX_ "cond_wait lock needs to be passed as ref");
1138 ref_lock = SvRV(ref_lock);
1139 if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
1140 shared = Perl_sharedsv_find(aTHX_ ref_lock);
1141 if (!shared)
1142 croak("cond_wait lock must be a shared value");
1143 }
6d56dc1c 1144 if(shared->lock.owner != aTHX)
6f942b98 1145 croak("You need a lock before you can cond_wait");
6d56dc1c
NIS
1146 /* Stealing the members of the lock object worries me - NI-S */
1147 MUTEX_LOCK(&shared->lock.mutex);
1148 shared->lock.owner = NULL;
39f33d92
AB
1149 locks = shared->lock.locks;
1150 shared->lock.locks = 0;
89661126
AB
1151
1152 /* since we are releasing the lock here we need to tell other
1153 people that is ok to go ahead and use it */
1154 COND_SIGNAL(&shared->lock.cond);
a0e036c1 1155 COND_WAIT(user_condition, &shared->lock.mutex);
89661126 1156 while(shared->lock.owner != NULL) {
a0e036c1
MP
1157 /* OK -- must reacquire the lock */
1158 COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
1159 }
1160 shared->lock.owner = aTHX;
1161 shared->lock.locks = locks;
1162 MUTEX_UNLOCK(&shared->lock.mutex);
1163
1164int
1165cond_timedwait_enabled(SV *ref_cond, double abs, SV *ref_lock = 0)
1166 PROTOTYPE: \[$@%]$;\[$@%]
1167 PREINIT:
1168 shared_sv* shared;
1169 perl_cond* user_condition;
1170 int locks;
1171 int same = 0;
1172
1173 CODE:
1174 if (!ref_lock || ref_cond == ref_lock) same = 1;
1175
1176 if(!SvROK(ref_cond))
1177 Perl_croak(aTHX_ "Argument to cond_timedwait needs to be passed as ref");
1178 ref_cond = SvRV(ref_cond);
1179 if(SvROK(ref_cond))
1180 ref_cond = SvRV(ref_cond);
1181 shared = Perl_sharedsv_find(aTHX_ ref_cond);
1182 if(!shared)
1183 croak("cond_timedwait can only be used on shared values");
1184
1185 user_condition = &shared->user_cond;
1186 if (! same) {
1187 if (!SvROK(ref_lock))
1188 Perl_croak(aTHX_ "cond_timedwait lock needs to be passed as ref");
1189 ref_lock = SvRV(ref_lock);
1190 if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
1191 shared = Perl_sharedsv_find(aTHX_ ref_lock);
1192 if (!shared)
1193 croak("cond_timedwait lock must be a shared value");
1194 }
1195 if(shared->lock.owner != aTHX)
1196 croak("You need a lock before you can cond_wait");
1197
1198 MUTEX_LOCK(&shared->lock.mutex);
1199 shared->lock.owner = NULL;
1200 locks = shared->lock.locks;
1201 shared->lock.locks = 0;
1202 /* since we are releasing the lock here we need to tell other
1203 people that is ok to go ahead and use it */
1204 COND_SIGNAL(&shared->lock.cond);
1205 RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &shared->lock.mutex, abs);
1206 while (shared->lock.owner != NULL) {
1207 /* OK -- must reacquire the lock... */
1208 COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
1209 }
6d56dc1c
NIS
1210 shared->lock.owner = aTHX;
1211 shared->lock.locks = locks;
1212 MUTEX_UNLOCK(&shared->lock.mutex);
6f942b98 1213
a0e036c1
MP
1214 if (RETVAL == 0)
1215 XSRETURN_UNDEF;
1216 OUTPUT:
1217 RETVAL
1218
21312124
NIS
1219void
1220cond_signal_enabled(SV *ref)
ce127893 1221 PROTOTYPE: \[$@%]
6f942b98
AB
1222 CODE:
1223 shared_sv* shared;
56fcff86
AB
1224 if(!SvROK(ref))
1225 Perl_croak(aTHX_ "Argument to cond_signal needs to be passed as ref");
afe38520 1226 ref = SvRV(ref);
6f942b98
AB
1227 if(SvROK(ref))
1228 ref = SvRV(ref);
1229 shared = Perl_sharedsv_find(aTHX_ ref);
38875929
DM
1230 if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
1231 Perl_warner(aTHX_ packWARN(WARN_THREADS),
1232 "cond_signal() called on unlocked variable");
6f942b98
AB
1233 if(!shared)
1234 croak("cond_signal can only be used on shared values");
1235 COND_SIGNAL(&shared->user_cond);
1236
21312124
NIS
1237void
1238cond_broadcast_enabled(SV *ref)
ce127893 1239 PROTOTYPE: \[$@%]
6f942b98
AB
1240 CODE:
1241 shared_sv* shared;
56fcff86
AB
1242 if(!SvROK(ref))
1243 Perl_croak(aTHX_ "Argument to cond_broadcast needs to be passed as ref");
afe38520 1244 ref = SvRV(ref);
6f942b98
AB
1245 if(SvROK(ref))
1246 ref = SvRV(ref);
1247 shared = Perl_sharedsv_find(aTHX_ ref);
1248 if(!shared)
1249 croak("cond_broadcast can only be used on shared values");
38875929
DM
1250 if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
1251 Perl_warner(aTHX_ packWARN(WARN_THREADS),
1252 "cond_broadcast() called on unlocked variable");
6f942b98 1253 COND_BROADCAST(&shared->user_cond);
b050c948 1254
5c360ac5
AB
1255
1256SV*
1257bless(SV* ref, ...);
1258 PROTOTYPE: $;$
1259 CODE:
1260 {
1261 HV* stash;
1262 shared_sv* shared;
1263 if (items == 1)
1264 stash = CopSTASH(PL_curcop);
1265 else {
1266 SV* ssv = ST(1);
1267 STRLEN len;
1268 char *ptr;
1269
1270 if (ssv && !SvGMAGICAL(ssv) && !SvAMAGIC(ssv) && SvROK(ssv))
1271 Perl_croak(aTHX_ "Attempt to bless into a reference");
1272 ptr = SvPV(ssv,len);
1273 if (ckWARN(WARN_MISC) && len == 0)
1274 Perl_warner(aTHX_ packWARN(WARN_MISC),
1275 "Explicit blessing to '' (assuming package main)");
1276 stash = gv_stashpvn(ptr, len, TRUE);
1277 }
1278 SvREFCNT_inc(ref);
1279 (void)sv_bless(ref, stash);
1280 RETVAL = ref;
1281 shared = Perl_sharedsv_find(aTHX_ ref);
1282 if(shared) {
1283 dTHXc;
1284 ENTER_LOCK;
1285 SHARED_CONTEXT;
1286 {
1287 SV* fake_stash = newSVpv(HvNAME(stash),0);
1288 (void)sv_bless(SHAREDSvPTR(shared),(HV*)fake_stash);
1289 }
1290 CALLER_CONTEXT;
1291 LEAVE_LOCK;
1292 }
1293 }
1294 OUTPUT:
1295 RETVAL
1296
73e09c8f
JH
1297#endif /* USE_ITHREADS */
1298
68795e93
NIS
1299BOOT:
1300{
73e09c8f 1301#ifdef USE_ITHREADS
68795e93 1302 Perl_sharedsv_init(aTHX);
73e09c8f 1303#endif /* USE_ITHREADS */
68795e93 1304}
73e09c8f
JH
1305
1306
1307