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1 | /* shared.xs |
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2 | * |
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3 | * Copyright (c) 2001-2002, 2006 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 | * |
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12 | * Contributed by Artur Bergman <sky AT crucially DOT net> |
13 | * Pulled in the (an)other direction by Nick Ing-Simmons |
14 | * <nick AT ing-simmons DOT net> |
15 | * CPAN version produced by Jerry D. Hedden <jdhedden AT cpan DOT org> |
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16 | */ |
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17 | |
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18 | /* |
19 | * Shared variables are implemented by a scheme similar to tieing. |
20 | * Each thread has a proxy SV with attached magic -- "private SVs" -- |
21 | * which all point to a single SV in a separate shared interpreter |
22 | * (PL_sharedsv_space) -- "shared SVs". |
23 | * |
24 | * The shared SV holds the variable's true values, and its state is |
25 | * copied between the shared and private SVs with the usual |
26 | * mg_get()/mg_set() arrangement. |
27 | * |
28 | * Aggregates (AVs and HVs) are implemented using tie magic, except that |
29 | * the vtable used is one defined in this file rather than the standard one. |
7473853a |
30 | * This means that where a tie function like FETCH is normally invoked by |
29ecdb6f |
31 | * the tie magic's mg_get() function, we completely bypass the calling of a |
32 | * perl-level function, and directly call C-level code to handle it. On |
7473853a |
33 | * the other hand, calls to functions like PUSH are done directly by code |
34 | * in av.c, etc., which we can't bypass. So the best we can do is to provide |
29ecdb6f |
35 | * XS versions of these functions. We also have to attach a tie object, |
36 | * blessed into the class threads::shared::tie, to keep the method-calling |
37 | * code happy. |
38 | * |
39 | * Access to aggregate elements is done the usual tied way by returning a |
40 | * proxy PVLV element with attached element magic. |
41 | * |
42 | * Pointers to the shared SV are squirrelled away in the mg->mg_ptr field |
43 | * of magic (with mg_len == 0), and in the IV2PTR(SvIV(sv)) field of tied |
44 | * object SVs. These pointers have to be hidden like this because they |
45 | * cross interpreter boundaries, and we don't want sv_clear() and friends |
46 | * following them. |
47 | * |
48 | * The three basic shared types look like the following: |
49 | * |
50 | * ----------------- |
51 | * |
52 | * Shared scalar (my $s : shared): |
53 | * |
54 | * SV = PVMG(0x7ba238) at 0x7387a8 |
55 | * FLAGS = (PADMY,GMG,SMG) |
56 | * MAGIC = 0x824d88 |
57 | * MG_TYPE = PERL_MAGIC_shared_scalar(n) |
7473853a |
58 | * MG_PTR = 0x810358 <<<< pointer to the shared SV |
29ecdb6f |
59 | * |
60 | * ----------------- |
61 | * |
62 | * Shared aggregate (my @a : shared; my %h : shared): |
63 | * |
64 | * SV = PVAV(0x7175d0) at 0x738708 |
65 | * FLAGS = (PADMY,RMG) |
66 | * MAGIC = 0x824e48 |
67 | * MG_TYPE = PERL_MAGIC_tied(P) |
7473853a |
68 | * MG_OBJ = 0x7136e0 <<<< ref to the tied object |
29ecdb6f |
69 | * SV = RV(0x7136f0) at 0x7136e0 |
70 | * RV = 0x738640 |
71 | * SV = PVMG(0x7ba238) at 0x738640 <<<< the tied object |
72 | * FLAGS = (OBJECT,IOK,pIOK) |
7473853a |
73 | * IV = 8455000 <<<< pointer to the shared AV |
29ecdb6f |
74 | * STASH = 0x80abf0 "threads::shared::tie" |
7473853a |
75 | * MG_PTR = 0x810358 "" <<<< another pointer to the shared AV |
29ecdb6f |
76 | * ARRAY = 0x0 |
77 | * |
78 | * ----------------- |
79 | * |
80 | * Aggregate element (my @a : shared; $a[0]) |
81 | * |
82 | * SV = PVLV(0x77f628) at 0x713550 |
83 | * FLAGS = (GMG,SMG,RMG,pIOK) |
84 | * MAGIC = 0x72bd58 |
85 | * MG_TYPE = PERL_MAGIC_shared_scalar(n) |
7473853a |
86 | * MG_PTR = 0x8103c0 "" <<<< pointer to the shared element |
29ecdb6f |
87 | * MAGIC = 0x72bd18 |
88 | * MG_TYPE = PERL_MAGIC_tiedelem(p) |
7473853a |
89 | * MG_OBJ = 0x7136e0 <<<< ref to the tied object |
29ecdb6f |
90 | * SV = RV(0x7136f0) at 0x7136e0 |
91 | * RV = 0x738660 |
92 | * SV = PVMG(0x7ba278) at 0x738660 <<<< the tied object |
93 | * FLAGS = (OBJECT,IOK,pIOK) |
7473853a |
94 | * IV = 8455064 <<<< pointer to the shared AV |
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95 | * STASH = 0x80ac30 "threads::shared::tie" |
96 | * TYPE = t |
97 | * |
98 | * Note that PERL_MAGIC_tiedelem(p) magic doesn't have a pointer to a |
99 | * shared SV in mg_ptr; instead this is used to store the hash key, |
100 | * if any, like normal tied elements. Note also that element SVs may have |
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101 | * pointers to both the shared aggregate and the shared element. |
29ecdb6f |
102 | * |
103 | * |
104 | * Userland locks: |
105 | * |
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106 | * If a shared variable is used as a perl-level lock or condition |
29ecdb6f |
107 | * variable, then PERL_MAGIC_ext magic is attached to the associated |
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108 | * *shared* SV, whose mg_ptr field points to a malloc'ed structure |
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109 | * containing the necessary mutexes and condition variables. |
110 | * |
111 | * Nomenclature: |
112 | * |
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113 | * In this file, any variable name prefixed with 's' (e.g., ssv, stmp or sobj) |
114 | * usually represents a shared SV which corresponds to a private SV named |
115 | * without the prefix (e.g., sv, tmp or obj). |
116 | */ |
117 | |
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118 | #define PERL_NO_GET_CONTEXT |
b050c948 |
119 | #include "EXTERN.h" |
120 | #include "perl.h" |
121 | #include "XSUB.h" |
7473853a |
122 | #ifdef HAS_PPPORT_H |
39ec4146 |
123 | # define NEED_sv_2pv_flags |
05b59262 |
124 | # define NEED_vnewSVpvf |
125 | # define NEED_warner |
7473853a |
126 | # include "ppport.h" |
127 | # include "shared.h" |
128 | #endif |
b050c948 |
129 | |
73e09c8f |
130 | #ifdef USE_ITHREADS |
131 | |
e21694ed |
132 | /* Magic signature(s) for mg_private to make PERL_MAGIC_ext magic safer */ |
133 | #define UL_MAGIC_SIG 0x554C /* UL = user lock */ |
134 | |
21312124 |
135 | /* |
136 | * The shared things need an intepreter to live in ... |
137 | */ |
138 | PerlInterpreter *PL_sharedsv_space; /* The shared sv space */ |
139 | /* To access shared space we fake aTHX in this scope and thread's context */ |
057e91b3 |
140 | |
7473853a |
141 | /* Bug #24255: We include ENTER+SAVETMPS/FREETMPS+LEAVE with |
142 | * SHARED_CONTEXT/CALLER_CONTEXT macros, so that any mortals, etc. created |
1011f542 |
143 | * while in the shared interpreter context don't languish */ |
057e91b3 |
144 | |
7473853a |
145 | #define SHARED_CONTEXT \ |
146 | STMT_START { \ |
147 | PERL_SET_CONTEXT((aTHX = PL_sharedsv_space)); \ |
148 | ENTER; \ |
149 | SAVETMPS; \ |
057e91b3 |
150 | } STMT_END |
21312124 |
151 | |
152 | /* So we need a way to switch back to the caller's context... */ |
153 | /* So we declare _another_ copy of the aTHX variable ... */ |
154 | #define dTHXc PerlInterpreter *caller_perl = aTHX |
057e91b3 |
155 | |
7473853a |
156 | /* ... and use it to switch back */ |
157 | #define CALLER_CONTEXT \ |
158 | STMT_START { \ |
159 | FREETMPS; \ |
160 | LEAVE; \ |
161 | PERL_SET_CONTEXT((aTHX = caller_perl)); \ |
057e91b3 |
162 | } STMT_END |
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163 | |
164 | /* |
165 | * Only one thread at a time is allowed to mess with shared space. |
166 | */ |
a446a88f |
167 | |
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168 | typedef struct { |
169 | perl_mutex mutex; |
170 | PerlInterpreter *owner; |
171 | I32 locks; |
172 | perl_cond cond; |
6b85e4fe |
173 | #ifdef DEBUG_LOCKS |
7473853a |
174 | char * file; |
175 | int line; |
6b85e4fe |
176 | #endif |
6d56dc1c |
177 | } recursive_lock_t; |
178 | |
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179 | recursive_lock_t PL_sharedsv_lock; /* Mutex protecting the shared sv space */ |
6d56dc1c |
180 | |
181 | void |
182 | recursive_lock_init(pTHX_ recursive_lock_t *lock) |
183 | { |
184 | Zero(lock,1,recursive_lock_t); |
185 | MUTEX_INIT(&lock->mutex); |
186 | COND_INIT(&lock->cond); |
187 | } |
188 | |
a39edb3a |
189 | void |
579f9913 |
190 | recursive_lock_destroy(pTHX_ recursive_lock_t *lock) |
191 | { |
192 | MUTEX_DESTROY(&lock->mutex); |
193 | COND_DESTROY(&lock->cond); |
194 | } |
195 | |
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196 | void |
197 | recursive_lock_release(pTHX_ recursive_lock_t *lock) |
198 | { |
199 | MUTEX_LOCK(&lock->mutex); |
ba2940ce |
200 | if (lock->owner == aTHX) { |
201 | if (--lock->locks == 0) { |
202 | lock->owner = NULL; |
203 | COND_SIGNAL(&lock->cond); |
204 | } |
6d56dc1c |
205 | } |
206 | MUTEX_UNLOCK(&lock->mutex); |
207 | } |
a446a88f |
208 | |
6d56dc1c |
209 | void |
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210 | recursive_lock_acquire(pTHX_ recursive_lock_t *lock, char *file, int line) |
6d56dc1c |
211 | { |
212 | assert(aTHX); |
213 | MUTEX_LOCK(&lock->mutex); |
214 | if (lock->owner == aTHX) { |
7473853a |
215 | lock->locks++; |
216 | } else { |
217 | while (lock->owner) { |
6b85e4fe |
218 | #ifdef DEBUG_LOCKS |
7473853a |
219 | Perl_warn(aTHX_ " %p waiting - owned by %p %s:%d\n", |
220 | aTHX, lock->owner, lock->file, lock->line); |
6b85e4fe |
221 | #endif |
7473853a |
222 | COND_WAIT(&lock->cond,&lock->mutex); |
6b85e4fe |
223 | } |
7473853a |
224 | lock->locks = 1; |
225 | lock->owner = aTHX; |
6b85e4fe |
226 | #ifdef DEBUG_LOCKS |
7473853a |
227 | lock->file = file; |
228 | lock->line = line; |
6b85e4fe |
229 | #endif |
6d56dc1c |
230 | } |
231 | MUTEX_UNLOCK(&lock->mutex); |
6b85e4fe |
232 | SAVEDESTRUCTOR_X(recursive_lock_release,lock); |
6d56dc1c |
233 | } |
234 | |
7473853a |
235 | #define ENTER_LOCK \ |
236 | STMT_START { \ |
237 | ENTER; \ |
238 | recursive_lock_acquire(aTHX_ &PL_sharedsv_lock, __FILE__, __LINE__);\ |
239 | } STMT_END |
21312124 |
240 | |
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241 | /* The unlocking is done automatically at scope exit */ |
242 | #define LEAVE_LOCK LEAVE |
6d56dc1c |
243 | |
21312124 |
244 | |
245 | /* A common idiom is to acquire access and switch in ... */ |
7473853a |
246 | #define SHARED_EDIT \ |
247 | STMT_START { \ |
248 | ENTER_LOCK; \ |
249 | SHARED_CONTEXT; \ |
250 | } STMT_END |
21312124 |
251 | |
7473853a |
252 | /* ... then switch out and release access. */ |
253 | #define SHARED_RELEASE \ |
254 | STMT_START { \ |
255 | CALLER_CONTEXT; \ |
256 | LEAVE_LOCK; \ |
257 | } STMT_END |
85e0a142 |
258 | |
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259 | |
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260 | /* User-level locks: |
29ecdb6f |
261 | This structure is attached (using ext magic) to any shared SV that |
262 | is used by user-level locking or condition code |
21312124 |
263 | */ |
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264 | |
265 | typedef struct { |
7473853a |
266 | recursive_lock_t lock; /* For user-levl locks */ |
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267 | perl_cond user_cond; /* For user-level conditions */ |
29ecdb6f |
268 | } user_lock; |
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269 | |
7473853a |
270 | /* Magic used for attaching user_lock structs to shared SVs |
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271 | |
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272 | The vtable used has just one entry - when the SV goes away |
273 | we free the memory for the above. |
21312124 |
274 | */ |
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275 | |
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276 | int |
29ecdb6f |
277 | sharedsv_userlock_free(pTHX_ SV *sv, MAGIC *mg) |
21312124 |
278 | { |
29ecdb6f |
279 | user_lock *ul = (user_lock *) mg->mg_ptr; |
280 | assert(aTHX == PL_sharedsv_space); |
281 | if (ul) { |
7473853a |
282 | recursive_lock_destroy(aTHX_ &ul->lock); |
283 | COND_DESTROY(&ul->user_cond); |
284 | PerlMemShared_free(ul); |
285 | mg->mg_ptr = NULL; |
21312124 |
286 | } |
7473853a |
287 | return (0); |
21312124 |
288 | } |
289 | |
7473853a |
290 | MGVTBL sharedsv_userlock_vtbl = { |
291 | 0, /* get */ |
292 | 0, /* set */ |
293 | 0, /* len */ |
294 | 0, /* clear */ |
295 | sharedsv_userlock_free, /* free */ |
296 | 0, /* copy */ |
297 | 0, /* dup */ |
298 | #ifdef MGf_LOCAL |
299 | 0, /* local */ |
300 | #endif |
21312124 |
301 | }; |
302 | |
7473853a |
303 | /* |
304 | * Access to shared things is heavily based on MAGIC |
305 | * - in mg.h/mg.c/sv.c sense |
306 | */ |
21312124 |
307 | |
308 | /* In any thread that has access to a shared thing there is a "proxy" |
309 | for it in its own space which has 'MAGIC' associated which accesses |
310 | the shared thing. |
311 | */ |
312 | |
3bc7ad01 |
313 | extern MGVTBL sharedsv_scalar_vtbl; /* Scalars have this vtable */ |
314 | extern MGVTBL sharedsv_array_vtbl; /* Hashes and arrays have this |
315 | - like 'tie' */ |
316 | extern MGVTBL sharedsv_elem_vtbl; /* Elements of hashes and arrays have |
317 | this _AS WELL AS_ the scalar magic: |
29ecdb6f |
318 | The sharedsv_elem_vtbl associates the element with the array/hash and |
21312124 |
319 | the sharedsv_scalar_vtbl associates it with the value |
320 | */ |
321 | |
6b85e4fe |
322 | |
7473853a |
323 | /* Get shared aggregate SV pointed to by threads::shared::tie magic object */ |
29ecdb6f |
324 | |
325 | STATIC SV * |
326 | S_sharedsv_from_obj(pTHX_ SV *sv) |
6b85e4fe |
327 | { |
7473853a |
328 | return ((SvROK(sv)) ? INT2PTR(SV *, SvIV(SvRV(sv))) : NULL); |
29ecdb6f |
329 | } |
330 | |
331 | |
332 | /* Return the user_lock structure (if any) associated with a shared SV. |
7473853a |
333 | * If create is true, create one if it doesn't exist |
334 | */ |
29ecdb6f |
335 | STATIC user_lock * |
336 | S_get_userlock(pTHX_ SV* ssv, bool create) |
337 | { |
338 | MAGIC *mg; |
339 | user_lock *ul = NULL; |
340 | |
341 | assert(ssv); |
7473853a |
342 | /* XXX Redesign the storage of user locks so we don't need a global |
29ecdb6f |
343 | * lock to access them ???? DAPM */ |
344 | ENTER_LOCK; |
e21694ed |
345 | |
346 | /* Version of mg_find that also checks the private signature */ |
347 | for (mg = SvMAGIC(ssv); mg; mg = mg->mg_moremagic) { |
348 | if ((mg->mg_type == PERL_MAGIC_ext) && |
349 | (mg->mg_private == UL_MAGIC_SIG)) |
350 | { |
351 | break; |
352 | } |
353 | } |
354 | |
7473853a |
355 | if (mg) { |
356 | ul = (user_lock*)(mg->mg_ptr); |
357 | } else if (create) { |
358 | dTHXc; |
359 | SHARED_CONTEXT; |
360 | ul = (user_lock *) PerlMemShared_malloc(sizeof(user_lock)); |
361 | Zero(ul, 1, user_lock); |
362 | /* Attach to shared SV using ext magic */ |
e21694ed |
363 | mg = sv_magicext(ssv, NULL, PERL_MAGIC_ext, &sharedsv_userlock_vtbl, |
364 | (char *)ul, 0); |
365 | mg->mg_private = UL_MAGIC_SIG; /* Set private signature */ |
7473853a |
366 | recursive_lock_init(aTHX_ &ul->lock); |
367 | COND_INIT(&ul->user_cond); |
368 | CALLER_CONTEXT; |
29ecdb6f |
369 | } |
370 | LEAVE_LOCK; |
7473853a |
371 | return (ul); |
6b85e4fe |
372 | } |
373 | |
29ecdb6f |
374 | |
ba2940ce |
375 | /* Given a private side SV tries to find if the SV has a shared backend, |
376 | * by looking for the magic. |
377 | */ |
29ecdb6f |
378 | SV * |
21312124 |
379 | Perl_sharedsv_find(pTHX_ SV *sv) |
380 | { |
381 | MAGIC *mg; |
a446a88f |
382 | if (SvTYPE(sv) >= SVt_PVMG) { |
7473853a |
383 | switch(SvTYPE(sv)) { |
384 | case SVt_PVAV: |
385 | case SVt_PVHV: |
386 | if ((mg = mg_find(sv, PERL_MAGIC_tied)) |
387 | && mg->mg_virtual == &sharedsv_array_vtbl) { |
388 | return ((SV *)mg->mg_ptr); |
389 | } |
390 | break; |
391 | default: |
392 | /* This should work for elements as well as they |
393 | * have scalar magic as well as their element magic |
394 | */ |
395 | if ((mg = mg_find(sv, PERL_MAGIC_shared_scalar)) |
396 | && mg->mg_virtual == &sharedsv_scalar_vtbl) { |
397 | return ((SV *)mg->mg_ptr); |
398 | } |
399 | break; |
400 | } |
21312124 |
401 | } |
6b85e4fe |
402 | /* Just for tidyness of API also handle tie objects */ |
403 | if (SvROK(sv) && sv_derived_from(sv, "threads::shared::tie")) { |
7473853a |
404 | return (S_sharedsv_from_obj(aTHX_ sv)); |
6b85e4fe |
405 | } |
7473853a |
406 | return (NULL); |
21312124 |
407 | } |
68795e93 |
408 | |
68795e93 |
409 | |
7473853a |
410 | /* Associate a private SV with a shared SV by pointing the appropriate |
411 | * magics at it. |
412 | * Assumes lock is held. |
413 | */ |
29ecdb6f |
414 | void |
415 | Perl_sharedsv_associate(pTHX_ SV *sv, SV *ssv) |
21312124 |
416 | { |
a446a88f |
417 | MAGIC *mg = 0; |
a446a88f |
418 | |
29ecdb6f |
419 | /* If we are asked for any private ops we need a thread */ |
a446a88f |
420 | assert ( aTHX != PL_sharedsv_space ); |
421 | |
422 | /* To avoid need for recursive locks require caller to hold lock */ |
6d56dc1c |
423 | assert ( PL_sharedsv_lock.owner == aTHX ); |
6b85e4fe |
424 | |
29ecdb6f |
425 | switch(SvTYPE(sv)) { |
426 | case SVt_PVAV: |
427 | case SVt_PVHV: |
7473853a |
428 | if (!(mg = mg_find(sv, PERL_MAGIC_tied)) |
429 | || mg->mg_virtual != &sharedsv_array_vtbl |
430 | || (SV*) mg->mg_ptr != ssv) |
431 | { |
432 | SV *obj = newSV(0); |
433 | sv_setref_iv(obj, "threads::shared::tie", PTR2IV(ssv)); |
434 | if (mg) { |
435 | sv_unmagic(sv, PERL_MAGIC_tied); |
436 | } |
437 | mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl, |
438 | (char *)ssv, 0); |
439 | mg->mg_flags |= (MGf_COPY|MGf_DUP); |
440 | SvREFCNT_inc_void(ssv); |
441 | SvREFCNT_dec(obj); |
442 | } |
443 | break; |
68795e93 |
444 | |
29ecdb6f |
445 | default: |
7473853a |
446 | if ((SvTYPE(sv) < SVt_PVMG) |
447 | || !(mg = mg_find(sv, PERL_MAGIC_shared_scalar)) |
448 | || mg->mg_virtual != &sharedsv_scalar_vtbl |
449 | || (SV*) mg->mg_ptr != ssv) |
450 | { |
451 | if (mg) { |
452 | sv_unmagic(sv, PERL_MAGIC_shared_scalar); |
453 | } |
454 | mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar, |
455 | &sharedsv_scalar_vtbl, (char *)ssv, 0); |
456 | mg->mg_flags |= (MGf_DUP |
457 | #ifdef MGf_LOCAL |
458 | |MGf_LOCAL |
459 | #endif |
460 | ); |
461 | SvREFCNT_inc_void(ssv); |
462 | } |
463 | break; |
21312124 |
464 | } |
7473853a |
465 | |
29ecdb6f |
466 | assert ( Perl_sharedsv_find(aTHX_ sv) == ssv ); |
467 | } |
6b85e4fe |
468 | |
6b85e4fe |
469 | |
29ecdb6f |
470 | /* Given a private SV, create and return an associated shared SV. |
7473853a |
471 | * Assumes lock is held. |
472 | */ |
29ecdb6f |
473 | STATIC SV * |
474 | S_sharedsv_new_shared(pTHX_ SV *sv) |
475 | { |
476 | dTHXc; |
477 | SV *ssv; |
6b85e4fe |
478 | |
29ecdb6f |
479 | assert(PL_sharedsv_lock.owner == aTHX); |
480 | assert(aTHX != PL_sharedsv_space); |
68795e93 |
481 | |
29ecdb6f |
482 | SHARED_CONTEXT; |
483 | ssv = newSV(0); |
7473853a |
484 | SvREFCNT(ssv) = 0; /* Will be upped to 1 by Perl_sharedsv_associate */ |
29ecdb6f |
485 | sv_upgrade(ssv, SvTYPE(sv)); |
486 | CALLER_CONTEXT; |
487 | Perl_sharedsv_associate(aTHX_ sv, ssv); |
7473853a |
488 | return (ssv); |
29ecdb6f |
489 | } |
21312124 |
490 | |
21312124 |
491 | |
29ecdb6f |
492 | /* Given a shared SV, create and return an associated private SV. |
7473853a |
493 | * Assumes lock is held. |
494 | */ |
29ecdb6f |
495 | STATIC SV * |
496 | S_sharedsv_new_private(pTHX_ SV *ssv) |
497 | { |
498 | SV *sv; |
499 | |
500 | assert(PL_sharedsv_lock.owner == aTHX); |
501 | assert(aTHX != PL_sharedsv_space); |
502 | |
503 | sv = newSV(0); |
504 | sv_upgrade(sv, SvTYPE(ssv)); |
505 | Perl_sharedsv_associate(aTHX_ sv, ssv); |
7473853a |
506 | return (sv); |
21312124 |
507 | } |
68795e93 |
508 | |
29ecdb6f |
509 | |
7473853a |
510 | /* A threadsafe version of SvREFCNT_dec(ssv) */ |
29ecdb6f |
511 | |
512 | STATIC void |
513 | S_sharedsv_dec(pTHX_ SV* ssv) |
68795e93 |
514 | { |
7473853a |
515 | if (! ssv) |
516 | return; |
29ecdb6f |
517 | ENTER_LOCK; |
518 | if (SvREFCNT(ssv) > 1) { |
7473853a |
519 | /* No side effects, so can do it lightweight */ |
520 | SvREFCNT_dec(ssv); |
521 | } else { |
522 | dTHXc; |
523 | SHARED_CONTEXT; |
524 | SvREFCNT_dec(ssv); |
525 | CALLER_CONTEXT; |
21312124 |
526 | } |
29ecdb6f |
527 | LEAVE_LOCK; |
68795e93 |
528 | } |
529 | |
7473853a |
530 | |
531 | /* Implements Perl-level share() and :shared */ |
29ecdb6f |
532 | |
21312124 |
533 | void |
534 | Perl_sharedsv_share(pTHX_ SV *sv) |
535 | { |
536 | switch(SvTYPE(sv)) { |
537 | case SVt_PVGV: |
7473853a |
538 | Perl_croak(aTHX_ "Cannot share globs yet"); |
539 | break; |
21312124 |
540 | |
541 | case SVt_PVCV: |
7473853a |
542 | Perl_croak(aTHX_ "Cannot share subs yet"); |
543 | break; |
85e0a142 |
544 | |
21312124 |
545 | default: |
7473853a |
546 | ENTER_LOCK; |
547 | (void) S_sharedsv_new_shared(aTHX_ sv); |
548 | LEAVE_LOCK; |
549 | SvSETMAGIC(sv); |
550 | break; |
21312124 |
551 | } |
552 | } |
68795e93 |
553 | |
7473853a |
554 | |
2a6601ce |
555 | #ifdef WIN32 |
556 | /* Number of milliseconds from 1/1/1601 to 1/1/1970 */ |
557 | #define EPOCH_BIAS 11644473600000. |
558 | |
559 | /* Returns relative time in milliseconds. (Adapted from Time::HiRes.) */ |
560 | STATIC DWORD |
561 | S_abs_2_rel_milli(double abs) |
562 | { |
563 | double rel; |
564 | |
565 | /* Get current time (in units of 100 nanoseconds since 1/1/1601) */ |
566 | union { |
05b59262 |
567 | FILETIME ft; |
568 | __int64 i64; /* 'signed' to keep compilers happy */ |
2a6601ce |
569 | } now; |
570 | |
571 | GetSystemTimeAsFileTime(&now.ft); |
572 | |
573 | /* Relative time in milliseconds */ |
574 | rel = (abs * 1000.) - (((double)now.i64 / 10000.) - EPOCH_BIAS); |
2a6601ce |
575 | if (rel <= 0.0) { |
576 | return (0); |
577 | } |
578 | return (DWORD)rel; |
579 | } |
580 | |
581 | #else |
582 | # if defined(OS2) |
7473853a |
583 | # define ABS2RELMILLI(abs) \ |
a0e036c1 |
584 | do { \ |
2666606c |
585 | abs -= (double)time(NULL); \ |
a0e036c1 |
586 | if (abs > 0) { abs *= 1000; } \ |
587 | else { abs = 0; } \ |
588 | } while (0) |
2a6601ce |
589 | # endif /* OS2 */ |
590 | #endif /* WIN32 */ |
a0e036c1 |
591 | |
7473853a |
592 | /* Do OS-specific condition timed wait */ |
29ecdb6f |
593 | |
a0e036c1 |
594 | bool |
595 | Perl_sharedsv_cond_timedwait(perl_cond *cond, perl_mutex *mut, double abs) |
596 | { |
597 | #if defined(NETWARE) || defined(FAKE_THREADS) || defined(I_MACH_CTHREADS) |
598 | Perl_croak_nocontext("cond_timedwait not supported on this platform"); |
599 | #else |
600 | # ifdef WIN32 |
601 | int got_it = 0; |
602 | |
a0e036c1 |
603 | cond->waiters++; |
604 | MUTEX_UNLOCK(mut); |
605 | /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */ |
2a6601ce |
606 | switch (WaitForSingleObject(cond->sem, S_abs_2_rel_milli(abs))) { |
a0e036c1 |
607 | case WAIT_OBJECT_0: got_it = 1; break; |
608 | case WAIT_TIMEOUT: break; |
609 | default: |
610 | /* WAIT_FAILED? WAIT_ABANDONED? others? */ |
611 | Perl_croak_nocontext("panic: cond_timedwait (%ld)",GetLastError()); |
612 | break; |
613 | } |
614 | MUTEX_LOCK(mut); |
2666606c |
615 | cond->waiters--; |
7473853a |
616 | return (got_it); |
a0e036c1 |
617 | # else |
618 | # ifdef OS2 |
619 | int rc, got_it = 0; |
620 | STRLEN n_a; |
621 | |
622 | ABS2RELMILLI(abs); |
623 | |
624 | if ((rc = DosResetEventSem(*cond,&n_a)) && (rc != ERROR_ALREADY_RESET)) |
625 | Perl_rc = rc, croak_with_os2error("panic: cond_timedwait-reset"); |
626 | MUTEX_UNLOCK(mut); |
627 | if (CheckOSError(DosWaitEventSem(*cond,abs)) |
628 | && (rc != ERROR_INTERRUPT)) |
629 | croak_with_os2error("panic: cond_timedwait"); |
630 | if (rc == ERROR_INTERRUPT) errno = EINTR; |
631 | MUTEX_LOCK(mut); |
7473853a |
632 | return (got_it); |
633 | # else /* Hope you're I_PTHREAD! */ |
a0e036c1 |
634 | struct timespec ts; |
635 | int got_it = 0; |
636 | |
637 | ts.tv_sec = (long)abs; |
638 | abs -= (NV)ts.tv_sec; |
639 | ts.tv_nsec = (long)(abs * 1000000000.0); |
640 | |
641 | switch (pthread_cond_timedwait(cond, mut, &ts)) { |
642 | case 0: got_it = 1; break; |
643 | case ETIMEDOUT: break; |
cf0d1c66 |
644 | #ifdef OEMVS |
645 | case -1: |
7473853a |
646 | if (errno == ETIMEDOUT || errno == EAGAIN) |
647 | break; |
cf0d1c66 |
648 | #endif |
a0e036c1 |
649 | default: |
650 | Perl_croak_nocontext("panic: cond_timedwait"); |
651 | break; |
652 | } |
7473853a |
653 | return (got_it); |
a0e036c1 |
654 | # endif /* OS2 */ |
655 | # endif /* WIN32 */ |
656 | #endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */ |
657 | } |
658 | |
dad67c22 |
659 | |
7473853a |
660 | /* Given a shared RV, copy it's value to a private RV, also copying the |
dad67c22 |
661 | * object status of the referent. |
662 | * If the private side is already an appropriate RV->SV combination, keep |
663 | * it if possible. |
664 | */ |
dad67c22 |
665 | STATIC void |
666 | S_get_RV(pTHX_ SV *sv, SV *ssv) { |
667 | SV *sobj = SvRV(ssv); |
668 | SV *obj; |
7473853a |
669 | if (! (SvROK(sv) && |
670 | ((obj = SvRV(sv))) && |
671 | (Perl_sharedsv_find(aTHX_ obj) == sobj) && |
672 | (SvTYPE(obj) == SvTYPE(sobj)))) |
dad67c22 |
673 | { |
7473853a |
674 | /* Can't reuse obj */ |
675 | if (SvROK(sv)) { |
676 | SvREFCNT_dec(SvRV(sv)); |
677 | } else { |
678 | assert(SvTYPE(sv) >= SVt_RV); |
679 | sv_setsv_nomg(sv, &PL_sv_undef); |
680 | SvROK_on(sv); |
681 | } |
682 | obj = S_sharedsv_new_private(aTHX_ SvRV(ssv)); |
683 | SvRV_set(sv, obj); |
dad67c22 |
684 | } |
685 | |
686 | if (SvOBJECT(obj)) { |
7473853a |
687 | /* Remove any old blessing */ |
688 | SvREFCNT_dec(SvSTASH(obj)); |
689 | SvOBJECT_off(obj); |
dad67c22 |
690 | } |
691 | if (SvOBJECT(sobj)) { |
7473853a |
692 | /* Add any new old blessing */ |
693 | STRLEN len; |
694 | char* stash_ptr = SvPV((SV*) SvSTASH(sobj), len); |
695 | HV* stash = gv_stashpvn(stash_ptr, len, TRUE); |
696 | SvOBJECT_on(obj); |
697 | SvSTASH_set(obj, (HV*)SvREFCNT_inc(stash)); |
dad67c22 |
698 | } |
699 | } |
700 | |
701 | |
29ecdb6f |
702 | /* ------------ PERL_MAGIC_shared_scalar(n) functions -------------- */ |
703 | |
7473853a |
704 | /* Get magic for PERL_MAGIC_shared_scalar(n) */ |
68795e93 |
705 | |
21312124 |
706 | int |
707 | sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
708 | { |
29ecdb6f |
709 | SV *ssv = (SV *) mg->mg_ptr; |
710 | assert(ssv); |
21312124 |
711 | |
6d56dc1c |
712 | ENTER_LOCK; |
29ecdb6f |
713 | if (SvROK(ssv)) { |
7473853a |
714 | S_get_RV(aTHX_ sv, ssv); |
715 | } else { |
716 | sv_setsv_nomg(sv, ssv); |
21312124 |
717 | } |
6d56dc1c |
718 | LEAVE_LOCK; |
7473853a |
719 | return (0); |
21312124 |
720 | } |
721 | |
7473853a |
722 | /* Copy the contents of a private SV to a shared SV. |
723 | * Used by various mg_set()-type functions. |
724 | * Assumes lock is held. |
725 | */ |
6b85e4fe |
726 | void |
29ecdb6f |
727 | sharedsv_scalar_store(pTHX_ SV *sv, SV *ssv) |
21312124 |
728 | { |
729 | dTHXc; |
21312124 |
730 | bool allowed = TRUE; |
29ecdb6f |
731 | |
732 | assert(PL_sharedsv_lock.owner == aTHX); |
21312124 |
733 | if (SvROK(sv)) { |
7473853a |
734 | SV *obj = SvRV(sv); |
735 | SV *sobj = Perl_sharedsv_find(aTHX_ obj); |
736 | if (sobj) { |
737 | SHARED_CONTEXT; |
2a6601ce |
738 | (void)SvUPGRADE(ssv, SVt_RV); |
7473853a |
739 | sv_setsv_nomg(ssv, &PL_sv_undef); |
740 | |
741 | SvRV_set(ssv, SvREFCNT_inc(sobj)); |
742 | SvROK_on(ssv); |
743 | if (SvOBJECT(sobj)) { |
744 | /* Remove any old blessing */ |
745 | SvREFCNT_dec(SvSTASH(sobj)); |
746 | SvOBJECT_off(sobj); |
747 | } |
748 | if (SvOBJECT(obj)) { |
749 | SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(obj)),0); |
750 | SvOBJECT_on(sobj); |
751 | SvSTASH_set(sobj, (HV*)fake_stash); |
752 | } |
753 | CALLER_CONTEXT; |
754 | } else { |
755 | allowed = FALSE; |
756 | } |
757 | } else { |
5c360ac5 |
758 | SvTEMP_off(sv); |
7473853a |
759 | SHARED_CONTEXT; |
760 | sv_setsv_nomg(ssv, sv); |
761 | if (SvOBJECT(ssv)) { |
762 | /* Remove any old blessing */ |
763 | SvREFCNT_dec(SvSTASH(ssv)); |
764 | SvOBJECT_off(ssv); |
765 | } |
766 | if (SvOBJECT(sv)) { |
767 | SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(sv)),0); |
768 | SvOBJECT_on(ssv); |
769 | SvSTASH_set(ssv, (HV*)fake_stash); |
770 | } |
771 | CALLER_CONTEXT; |
21312124 |
772 | } |
21312124 |
773 | if (!allowed) { |
7473853a |
774 | Perl_croak(aTHX_ "Invalid value for shared scalar"); |
21312124 |
775 | } |
6b85e4fe |
776 | } |
777 | |
7473853a |
778 | /* Set magic for PERL_MAGIC_shared_scalar(n) */ |
29ecdb6f |
779 | |
6b85e4fe |
780 | int |
781 | sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg) |
782 | { |
29ecdb6f |
783 | SV *ssv = (SV*)(mg->mg_ptr); |
784 | assert(ssv); |
6b85e4fe |
785 | ENTER_LOCK; |
29ecdb6f |
786 | if (SvTYPE(ssv) < SvTYPE(sv)) { |
7473853a |
787 | dTHXc; |
788 | SHARED_CONTEXT; |
789 | sv_upgrade(ssv, SvTYPE(sv)); |
790 | CALLER_CONTEXT; |
29ecdb6f |
791 | } |
792 | sharedsv_scalar_store(aTHX_ sv, ssv); |
6b85e4fe |
793 | LEAVE_LOCK; |
7473853a |
794 | return (0); |
68795e93 |
795 | } |
796 | |
7473853a |
797 | /* Free magic for PERL_MAGIC_shared_scalar(n) */ |
a446a88f |
798 | |
799 | int |
29ecdb6f |
800 | sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg) |
a446a88f |
801 | { |
29ecdb6f |
802 | S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr); |
7473853a |
803 | return (0); |
21312124 |
804 | } |
68795e93 |
805 | |
806 | /* |
29ecdb6f |
807 | * Called during cloning of PERL_MAGIC_shared_scalar(n) magic in new thread |
21312124 |
808 | */ |
809 | int |
810 | sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
811 | { |
7473853a |
812 | SvREFCNT_inc_void(mg->mg_ptr); |
813 | return (0); |
21312124 |
814 | } |
68795e93 |
815 | |
7473853a |
816 | #ifdef MGf_LOCAL |
a5063e7c |
817 | /* |
818 | * Called during local $shared |
819 | */ |
820 | int |
821 | sharedsv_scalar_mg_local(pTHX_ SV* nsv, MAGIC *mg) |
822 | { |
823 | MAGIC *nmg; |
29ecdb6f |
824 | SV *ssv = (SV *) mg->mg_ptr; |
825 | if (ssv) { |
7473853a |
826 | ENTER_LOCK; |
827 | SvREFCNT_inc_void(ssv); |
828 | LEAVE_LOCK; |
a5063e7c |
829 | } |
830 | nmg = sv_magicext(nsv, mg->mg_obj, mg->mg_type, mg->mg_virtual, |
7473853a |
831 | mg->mg_ptr, mg->mg_len); |
a5063e7c |
832 | nmg->mg_flags = mg->mg_flags; |
833 | nmg->mg_private = mg->mg_private; |
834 | |
7473853a |
835 | return (0); |
a5063e7c |
836 | } |
7473853a |
837 | #endif |
a5063e7c |
838 | |
21312124 |
839 | MGVTBL sharedsv_scalar_vtbl = { |
7473853a |
840 | sharedsv_scalar_mg_get, /* get */ |
841 | sharedsv_scalar_mg_set, /* set */ |
842 | 0, /* len */ |
843 | 0, /* clear */ |
844 | sharedsv_scalar_mg_free, /* free */ |
845 | 0, /* copy */ |
846 | sharedsv_scalar_mg_dup, /* dup */ |
847 | #ifdef MGf_LOCAL |
848 | sharedsv_scalar_mg_local, /* local */ |
849 | #endif |
21312124 |
850 | }; |
68795e93 |
851 | |
29ecdb6f |
852 | /* ------------ PERL_MAGIC_tiedelem(p) functions -------------- */ |
853 | |
7473853a |
854 | /* Get magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
855 | |
21312124 |
856 | int |
857 | sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
858 | { |
21312124 |
859 | dTHXc; |
29ecdb6f |
860 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
21312124 |
861 | SV** svp; |
862 | |
6b85e4fe |
863 | ENTER_LOCK; |
29ecdb6f |
864 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
865 | assert ( mg->mg_ptr == 0 ); |
866 | SHARED_CONTEXT; |
867 | svp = av_fetch((AV*) saggregate, mg->mg_len, 0); |
868 | } else { |
869 | char *key = mg->mg_ptr; |
870 | STRLEN len = mg->mg_len; |
871 | assert ( mg->mg_ptr != 0 ); |
872 | if (mg->mg_len == HEf_SVKEY) { |
873 | key = SvPV((SV *) mg->mg_ptr, len); |
874 | } |
875 | SHARED_CONTEXT; |
876 | svp = hv_fetch((HV*) saggregate, key, len, 0); |
21312124 |
877 | } |
6b85e4fe |
878 | CALLER_CONTEXT; |
21312124 |
879 | if (svp) { |
7473853a |
880 | /* Exists in the array */ |
881 | if (SvROK(*svp)) { |
882 | S_get_RV(aTHX_ sv, *svp); |
883 | } else { |
884 | /* XXX Can this branch ever happen? DAPM */ |
885 | /* XXX assert("no such branch"); */ |
886 | Perl_sharedsv_associate(aTHX_ sv, *svp); |
887 | sv_setsv(sv, *svp); |
888 | } |
889 | } else { |
890 | /* Not in the array */ |
891 | sv_setsv(sv, &PL_sv_undef); |
68795e93 |
892 | } |
6b85e4fe |
893 | LEAVE_LOCK; |
7473853a |
894 | return (0); |
68795e93 |
895 | } |
896 | |
7473853a |
897 | /* Set magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
898 | |
21312124 |
899 | int |
900 | sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg) |
901 | { |
902 | dTHXc; |
29ecdb6f |
903 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
6b85e4fe |
904 | SV **svp; |
21312124 |
905 | /* Theory - SV itself is magically shared - and we have ordered the |
906 | magic such that by the time we get here it has been stored |
907 | to its shared counterpart |
908 | */ |
6d56dc1c |
909 | ENTER_LOCK; |
29ecdb6f |
910 | assert(saggregate); |
911 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
912 | assert ( mg->mg_ptr == 0 ); |
913 | SHARED_CONTEXT; |
914 | svp = av_fetch((AV*) saggregate, mg->mg_len, 1); |
915 | } else { |
916 | char *key = mg->mg_ptr; |
917 | STRLEN len = mg->mg_len; |
918 | assert ( mg->mg_ptr != 0 ); |
919 | if (mg->mg_len == HEf_SVKEY) |
920 | key = SvPV((SV *) mg->mg_ptr, len); |
921 | SHARED_CONTEXT; |
922 | svp = hv_fetch((HV*) saggregate, key, len, 1); |
21312124 |
923 | } |
6b85e4fe |
924 | CALLER_CONTEXT; |
29ecdb6f |
925 | Perl_sharedsv_associate(aTHX_ sv, *svp); |
926 | sharedsv_scalar_store(aTHX_ sv, *svp); |
6b85e4fe |
927 | LEAVE_LOCK; |
7473853a |
928 | return (0); |
21312124 |
929 | } |
68795e93 |
930 | |
7473853a |
931 | /* Clear magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
932 | |
21312124 |
933 | int |
934 | sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
935 | { |
21312124 |
936 | dTHXc; |
057e91b3 |
937 | MAGIC *shmg; |
29ecdb6f |
938 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
6b85e4fe |
939 | ENTER_LOCK; |
940 | sharedsv_elem_mg_FETCH(aTHX_ sv, mg); |
057e91b3 |
941 | if ((shmg = mg_find(sv, PERL_MAGIC_shared_scalar))) |
7473853a |
942 | sharedsv_scalar_mg_get(aTHX_ sv, shmg); |
29ecdb6f |
943 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
944 | SHARED_CONTEXT; |
945 | av_delete((AV*) saggregate, mg->mg_len, G_DISCARD); |
946 | } else { |
947 | char *key = mg->mg_ptr; |
948 | STRLEN len = mg->mg_len; |
949 | assert ( mg->mg_ptr != 0 ); |
950 | if (mg->mg_len == HEf_SVKEY) |
951 | key = SvPV((SV *) mg->mg_ptr, len); |
952 | SHARED_CONTEXT; |
953 | hv_delete((HV*) saggregate, key, len, G_DISCARD); |
21312124 |
954 | } |
6b85e4fe |
955 | CALLER_CONTEXT; |
956 | LEAVE_LOCK; |
7473853a |
957 | return (0); |
21312124 |
958 | } |
959 | |
29ecdb6f |
960 | /* Called during cloning of PERL_MAGIC_tiedelem(p) magic in new |
961 | * thread */ |
962 | |
21312124 |
963 | int |
964 | sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
965 | { |
7473853a |
966 | SvREFCNT_inc_void(S_sharedsv_from_obj(aTHX_ mg->mg_obj)); |
29ecdb6f |
967 | assert(mg->mg_flags & MGf_DUP); |
7473853a |
968 | return (0); |
21312124 |
969 | } |
970 | |
971 | MGVTBL sharedsv_elem_vtbl = { |
7473853a |
972 | sharedsv_elem_mg_FETCH, /* get */ |
973 | sharedsv_elem_mg_STORE, /* set */ |
974 | 0, /* len */ |
975 | sharedsv_elem_mg_DELETE, /* clear */ |
976 | 0, /* free */ |
977 | 0, /* copy */ |
978 | sharedsv_elem_mg_dup, /* dup */ |
979 | #ifdef MGf_LOCAL |
980 | 0, /* local */ |
981 | #endif |
21312124 |
982 | }; |
983 | |
29ecdb6f |
984 | /* ------------ PERL_MAGIC_tied(P) functions -------------- */ |
985 | |
7473853a |
986 | /* Len magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
987 | |
21312124 |
988 | U32 |
989 | sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg) |
990 | { |
991 | dTHXc; |
29ecdb6f |
992 | SV *ssv = (SV *) mg->mg_ptr; |
21312124 |
993 | U32 val; |
994 | SHARED_EDIT; |
29ecdb6f |
995 | if (SvTYPE(ssv) == SVt_PVAV) { |
7473853a |
996 | val = av_len((AV*) ssv); |
997 | } else { |
998 | /* Not actually defined by tie API but ... */ |
999 | val = HvKEYS((HV*) ssv); |
21312124 |
1000 | } |
1001 | SHARED_RELEASE; |
7473853a |
1002 | return (val); |
21312124 |
1003 | } |
1004 | |
7473853a |
1005 | /* Clear magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
1006 | |
21312124 |
1007 | int |
1008 | sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg) |
1009 | { |
1010 | dTHXc; |
29ecdb6f |
1011 | SV *ssv = (SV *) mg->mg_ptr; |
21312124 |
1012 | SHARED_EDIT; |
29ecdb6f |
1013 | if (SvTYPE(ssv) == SVt_PVAV) { |
7473853a |
1014 | av_clear((AV*) ssv); |
1015 | } else { |
1016 | hv_clear((HV*) ssv); |
21312124 |
1017 | } |
1018 | SHARED_RELEASE; |
7473853a |
1019 | return (0); |
21312124 |
1020 | } |
1021 | |
7473853a |
1022 | /* Free magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
1023 | |
21312124 |
1024 | int |
1025 | sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg) |
1026 | { |
29ecdb6f |
1027 | S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr); |
7473853a |
1028 | return (0); |
68795e93 |
1029 | } |
1030 | |
1031 | /* |
7473853a |
1032 | * Copy magic for PERL_MAGIC_tied(P) |
21312124 |
1033 | * This is called when perl is about to access an element of |
1034 | * the array - |
1035 | */ |
33d16ee7 |
1036 | #if PERL_VERSION >= 11 |
21312124 |
1037 | int |
1038 | sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg, |
3468c7ea |
1039 | SV *nsv, const char *name, I32 namlen) |
33d16ee7 |
1040 | #else |
1041 | int |
1042 | sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg, |
1043 | SV *nsv, const char *name, int namlen) |
1044 | #endif |
21312124 |
1045 | { |
21312124 |
1046 | MAGIC *nmg = sv_magicext(nsv,mg->mg_obj, |
7473853a |
1047 | toLOWER(mg->mg_type),&sharedsv_elem_vtbl, |
1048 | name, namlen); |
21312124 |
1049 | nmg->mg_flags |= MGf_DUP; |
7473853a |
1050 | return (1); |
21312124 |
1051 | } |
1052 | |
29ecdb6f |
1053 | /* Called during cloning of PERL_MAGIC_tied(P) magic in new thread */ |
1054 | |
21312124 |
1055 | int |
1056 | sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
1057 | { |
7473853a |
1058 | SvREFCNT_inc_void((SV*)mg->mg_ptr); |
29ecdb6f |
1059 | assert(mg->mg_flags & MGf_DUP); |
7473853a |
1060 | return (0); |
21312124 |
1061 | } |
1062 | |
1063 | MGVTBL sharedsv_array_vtbl = { |
7473853a |
1064 | 0, /* get */ |
1065 | 0, /* set */ |
1066 | sharedsv_array_mg_FETCHSIZE,/* len */ |
1067 | sharedsv_array_mg_CLEAR, /* clear */ |
1068 | sharedsv_array_mg_free, /* free */ |
1069 | sharedsv_array_mg_copy, /* copy */ |
1070 | sharedsv_array_mg_dup, /* dup */ |
1071 | #ifdef MGf_LOCAL |
1072 | 0, /* local */ |
1073 | #endif |
21312124 |
1074 | }; |
1075 | |
68795e93 |
1076 | |
ba2940ce |
1077 | /* Recursively unlocks a shared sv. */ |
68795e93 |
1078 | |
1079 | void |
29ecdb6f |
1080 | Perl_sharedsv_unlock(pTHX_ SV *ssv) |
68795e93 |
1081 | { |
29ecdb6f |
1082 | user_lock *ul = S_get_userlock(aTHX_ ssv, 0); |
1083 | assert(ul); |
1084 | recursive_lock_release(aTHX_ &ul->lock); |
68795e93 |
1085 | } |
1086 | |
68795e93 |
1087 | |
ba2940ce |
1088 | /* Recursive locks on a sharedsv. |
1089 | * Locks are dynamically scoped at the level of the first lock. |
1090 | */ |
68795e93 |
1091 | void |
29ecdb6f |
1092 | Perl_sharedsv_lock(pTHX_ SV *ssv) |
68795e93 |
1093 | { |
29ecdb6f |
1094 | user_lock *ul; |
7473853a |
1095 | if (! ssv) |
1096 | return; |
29ecdb6f |
1097 | ul = S_get_userlock(aTHX_ ssv, 1); |
1098 | recursive_lock_acquire(aTHX_ &ul->lock, __FILE__, __LINE__); |
68795e93 |
1099 | } |
1100 | |
7473853a |
1101 | /* Handles calls from lock() builtin via PL_lockhook */ |
afe38520 |
1102 | |
21312124 |
1103 | void |
1104 | Perl_sharedsv_locksv(pTHX_ SV *sv) |
1105 | { |
29ecdb6f |
1106 | SV *ssv; |
afe38520 |
1107 | |
7473853a |
1108 | if (SvROK(sv)) |
1109 | sv = SvRV(sv); |
29ecdb6f |
1110 | ssv = Perl_sharedsv_find(aTHX_ sv); |
7473853a |
1111 | if (!ssv) |
afe38520 |
1112 | croak("lock can only be used on shared values"); |
29ecdb6f |
1113 | Perl_sharedsv_lock(aTHX_ ssv); |
b050c948 |
1114 | } |
1115 | |
b050c948 |
1116 | |
794f4697 |
1117 | /* Can a shared object be destroyed? |
1118 | * True if not a shared, |
1119 | * or if detroying last proxy on a shared object |
1120 | */ |
1121 | #ifdef PL_destroyhook |
1122 | bool |
1123 | Perl_shared_object_destroy(pTHX_ SV *sv) |
1124 | { |
1125 | SV *ssv; |
1126 | |
1127 | if (SvROK(sv)) |
1128 | sv = SvRV(sv); |
1129 | ssv = Perl_sharedsv_find(aTHX_ sv); |
1130 | return (!ssv || (SvREFCNT(ssv) <= 1)); |
1131 | } |
1132 | #endif |
1133 | |
1134 | |
ba2940ce |
1135 | /* Saves a space for keeping SVs wider than an interpreter. */ |
21312124 |
1136 | |
1137 | void |
1138 | Perl_sharedsv_init(pTHX) |
1139 | { |
7473853a |
1140 | dTHXc; |
1141 | /* This pair leaves us in shared context ... */ |
1142 | PL_sharedsv_space = perl_alloc(); |
1143 | perl_construct(PL_sharedsv_space); |
1144 | CALLER_CONTEXT; |
1145 | recursive_lock_init(aTHX_ &PL_sharedsv_lock); |
1146 | PL_lockhook = &Perl_sharedsv_locksv; |
1147 | PL_sharehook = &Perl_sharedsv_share; |
794f4697 |
1148 | #ifdef PL_destroyhook |
1149 | PL_destroyhook = &Perl_shared_object_destroy; |
1150 | #endif |
b050c948 |
1151 | } |
1152 | |
73e09c8f |
1153 | #endif /* USE_ITHREADS */ |
1154 | |
7473853a |
1155 | MODULE = threads::shared PACKAGE = threads::shared::tie |
b050c948 |
1156 | |
21312124 |
1157 | PROTOTYPES: DISABLE |
b050c948 |
1158 | |
73e09c8f |
1159 | #ifdef USE_ITHREADS |
6b85e4fe |
1160 | |
21312124 |
1161 | void |
29ecdb6f |
1162 | PUSH(SV *obj, ...) |
7473853a |
1163 | CODE: |
1164 | dTHXc; |
1165 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1166 | int i; |
1167 | for (i = 1; i < items; i++) { |
1168 | SV* tmp = newSVsv(ST(i)); |
1169 | SV *stmp; |
1170 | ENTER_LOCK; |
1171 | stmp = S_sharedsv_new_shared(aTHX_ tmp); |
1172 | sharedsv_scalar_store(aTHX_ tmp, stmp); |
1173 | SHARED_CONTEXT; |
1174 | av_push((AV*) sobj, stmp); |
1175 | SvREFCNT_inc_void(stmp); |
1176 | SHARED_RELEASE; |
1177 | SvREFCNT_dec(tmp); |
1178 | } |
1179 | |
b050c948 |
1180 | |
21312124 |
1181 | void |
29ecdb6f |
1182 | UNSHIFT(SV *obj, ...) |
7473853a |
1183 | CODE: |
1184 | dTHXc; |
1185 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1186 | int i; |
1187 | ENTER_LOCK; |
1188 | SHARED_CONTEXT; |
1189 | av_unshift((AV*)sobj, items - 1); |
1190 | CALLER_CONTEXT; |
1191 | for (i = 1; i < items; i++) { |
1192 | SV *tmp = newSVsv(ST(i)); |
1193 | SV *stmp = S_sharedsv_new_shared(aTHX_ tmp); |
1194 | sharedsv_scalar_store(aTHX_ tmp, stmp); |
1195 | SHARED_CONTEXT; |
1196 | av_store((AV*) sobj, i - 1, stmp); |
1197 | SvREFCNT_inc_void(stmp); |
1198 | CALLER_CONTEXT; |
1199 | SvREFCNT_dec(tmp); |
1200 | } |
1201 | LEAVE_LOCK; |
1202 | |
b050c948 |
1203 | |
21312124 |
1204 | void |
29ecdb6f |
1205 | POP(SV *obj) |
7473853a |
1206 | CODE: |
1207 | dTHXc; |
1208 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1209 | SV* ssv; |
1210 | ENTER_LOCK; |
1211 | SHARED_CONTEXT; |
1212 | ssv = av_pop((AV*)sobj); |
1213 | CALLER_CONTEXT; |
1214 | ST(0) = sv_newmortal(); |
1215 | Perl_sharedsv_associate(aTHX_ ST(0), ssv); |
1216 | SvREFCNT_dec(ssv); |
1217 | LEAVE_LOCK; |
1218 | /* XSRETURN(1); - implied */ |
1219 | |
b050c948 |
1220 | |
21312124 |
1221 | void |
29ecdb6f |
1222 | SHIFT(SV *obj) |
7473853a |
1223 | CODE: |
1224 | dTHXc; |
1225 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1226 | SV* ssv; |
1227 | ENTER_LOCK; |
1228 | SHARED_CONTEXT; |
1229 | ssv = av_shift((AV*)sobj); |
1230 | CALLER_CONTEXT; |
1231 | ST(0) = sv_newmortal(); |
1232 | Perl_sharedsv_associate(aTHX_ ST(0), ssv); |
1233 | SvREFCNT_dec(ssv); |
1234 | LEAVE_LOCK; |
1235 | /* XSRETURN(1); - implied */ |
1236 | |
b050c948 |
1237 | |
21312124 |
1238 | void |
29ecdb6f |
1239 | EXTEND(SV *obj, IV count) |
7473853a |
1240 | CODE: |
1241 | dTHXc; |
1242 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1243 | SHARED_EDIT; |
1244 | av_extend((AV*)sobj, count); |
1245 | SHARED_RELEASE; |
1246 | |
b050c948 |
1247 | |
21312124 |
1248 | void |
29ecdb6f |
1249 | STORESIZE(SV *obj,IV count) |
7473853a |
1250 | CODE: |
1251 | dTHXc; |
1252 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1253 | SHARED_EDIT; |
1254 | av_fill((AV*) sobj, count); |
1255 | SHARED_RELEASE; |
6b85e4fe |
1256 | |
1257 | |
1258 | void |
29ecdb6f |
1259 | EXISTS(SV *obj, SV *index) |
7473853a |
1260 | CODE: |
1261 | dTHXc; |
1262 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1263 | bool exists; |
1264 | if (SvTYPE(sobj) == SVt_PVAV) { |
1265 | SHARED_EDIT; |
1266 | exists = av_exists((AV*) sobj, SvIV(index)); |
1267 | } else { |
1268 | STRLEN len; |
1269 | char *key = SvPV(index,len); |
1270 | SHARED_EDIT; |
1271 | exists = hv_exists((HV*) sobj, key, len); |
1272 | } |
1273 | SHARED_RELEASE; |
1274 | ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no; |
1275 | /* XSRETURN(1); - implied */ |
b050c948 |
1276 | |
1277 | |
1278 | void |
29ecdb6f |
1279 | FIRSTKEY(SV *obj) |
7473853a |
1280 | CODE: |
1281 | dTHXc; |
1282 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1283 | char* key = NULL; |
1284 | I32 len = 0; |
1285 | HE* entry; |
1286 | ENTER_LOCK; |
1287 | SHARED_CONTEXT; |
1288 | hv_iterinit((HV*) sobj); |
1289 | entry = hv_iternext((HV*) sobj); |
1290 | if (entry) { |
1291 | key = hv_iterkey(entry,&len); |
1292 | CALLER_CONTEXT; |
1293 | ST(0) = sv_2mortal(newSVpv(key, len)); |
1294 | } else { |
1295 | CALLER_CONTEXT; |
1296 | ST(0) = &PL_sv_undef; |
1297 | } |
1298 | LEAVE_LOCK; |
1299 | /* XSRETURN(1); - implied */ |
1300 | |
b050c948 |
1301 | |
866fba46 |
1302 | void |
29ecdb6f |
1303 | NEXTKEY(SV *obj, SV *oldkey) |
7473853a |
1304 | CODE: |
1305 | dTHXc; |
1306 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1307 | char* key = NULL; |
1308 | I32 len = 0; |
1309 | HE* entry; |
2a6601ce |
1310 | |
1311 | PERL_UNUSED_VAR(oldkey); |
1312 | |
7473853a |
1313 | ENTER_LOCK; |
1314 | SHARED_CONTEXT; |
1315 | entry = hv_iternext((HV*) sobj); |
1316 | if (entry) { |
1317 | key = hv_iterkey(entry,&len); |
1318 | CALLER_CONTEXT; |
1319 | ST(0) = sv_2mortal(newSVpv(key, len)); |
1320 | } else { |
1321 | CALLER_CONTEXT; |
1322 | ST(0) = &PL_sv_undef; |
1323 | } |
1324 | LEAVE_LOCK; |
1325 | /* XSRETURN(1); - implied */ |
1326 | |
1327 | |
1328 | MODULE = threads::shared PACKAGE = threads::shared |
21312124 |
1329 | |
1330 | PROTOTYPES: ENABLE |
866fba46 |
1331 | |
68795e93 |
1332 | void |
39ec4146 |
1333 | _id(SV *myref) |
7473853a |
1334 | PROTOTYPE: \[$@%] |
1335 | PREINIT: |
1336 | SV *ssv; |
1337 | CODE: |
39ec4146 |
1338 | myref = SvRV(myref); |
1339 | if (SvROK(myref)) |
1340 | myref = SvRV(myref); |
1341 | ssv = Perl_sharedsv_find(aTHX_ myref); |
7473853a |
1342 | if (! ssv) |
1343 | XSRETURN_UNDEF; |
1344 | ST(0) = sv_2mortal(newSVuv(PTR2UV(ssv))); |
1345 | /* XSRETURN(1); - implied */ |
9c4972d9 |
1346 | |
1347 | |
1348 | void |
39ec4146 |
1349 | _refcnt(SV *myref) |
7473853a |
1350 | PROTOTYPE: \[$@%] |
1351 | PREINIT: |
1352 | SV *ssv; |
1353 | CODE: |
39ec4146 |
1354 | myref = SvRV(myref); |
1355 | if (SvROK(myref)) |
1356 | myref = SvRV(myref); |
1357 | ssv = Perl_sharedsv_find(aTHX_ myref); |
7473853a |
1358 | if (! ssv) { |
7c8caac0 |
1359 | if (ckWARN(WARN_THREADS)) { |
1360 | Perl_warner(aTHX_ packWARN(WARN_THREADS), |
1361 | "%" SVf " is not shared", ST(0)); |
1362 | } |
7473853a |
1363 | XSRETURN_UNDEF; |
1364 | } |
1365 | ST(0) = sv_2mortal(newSViv(SvREFCNT(ssv))); |
1366 | /* XSRETURN(1); - implied */ |
1367 | |
1368 | |
1369 | void |
39ec4146 |
1370 | share(SV *myref) |
7473853a |
1371 | PROTOTYPE: \[$@%] |
1372 | CODE: |
39ec4146 |
1373 | if (! SvROK(myref)) |
56fcff86 |
1374 | Perl_croak(aTHX_ "Argument to share needs to be passed as ref"); |
39ec4146 |
1375 | myref = SvRV(myref); |
1376 | if (SvROK(myref)) |
1377 | myref = SvRV(myref); |
1378 | Perl_sharedsv_share(aTHX_ myref); |
1379 | ST(0) = sv_2mortal(newRV_inc(myref)); |
7473853a |
1380 | /* XSRETURN(1); - implied */ |
a446a88f |
1381 | |
6f942b98 |
1382 | |
1383 | void |
7473853a |
1384 | cond_wait(SV *ref_cond, SV *ref_lock = 0) |
1385 | PROTOTYPE: \[$@%];\[$@%] |
1386 | PREINIT: |
1387 | SV *ssv; |
1388 | perl_cond* user_condition; |
1389 | int locks; |
1390 | user_lock *ul; |
1391 | CODE: |
1392 | if (!SvROK(ref_cond)) |
56fcff86 |
1393 | Perl_croak(aTHX_ "Argument to cond_wait needs to be passed as ref"); |
7473853a |
1394 | ref_cond = SvRV(ref_cond); |
1395 | if (SvROK(ref_cond)) |
1396 | ref_cond = SvRV(ref_cond); |
1397 | ssv = Perl_sharedsv_find(aTHX_ ref_cond); |
1398 | if (! ssv) |
1399 | Perl_croak(aTHX_ "cond_wait can only be used on shared values"); |
1400 | ul = S_get_userlock(aTHX_ ssv, 1); |
1401 | |
1402 | user_condition = &ul->user_cond; |
1403 | if (ref_lock && (ref_cond != ref_lock)) { |
1404 | if (!SvROK(ref_lock)) |
1405 | Perl_croak(aTHX_ "cond_wait lock needs to be passed as ref"); |
1406 | ref_lock = SvRV(ref_lock); |
1407 | if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock); |
1408 | ssv = Perl_sharedsv_find(aTHX_ ref_lock); |
1409 | if (! ssv) |
1410 | Perl_croak(aTHX_ "cond_wait lock must be a shared value"); |
1411 | ul = S_get_userlock(aTHX_ ssv, 1); |
1412 | } |
1413 | if (ul->lock.owner != aTHX) |
1414 | croak("You need a lock before you can cond_wait"); |
ba2940ce |
1415 | |
7473853a |
1416 | /* Stealing the members of the lock object worries me - NI-S */ |
1417 | MUTEX_LOCK(&ul->lock.mutex); |
1418 | ul->lock.owner = NULL; |
1419 | locks = ul->lock.locks; |
1420 | ul->lock.locks = 0; |
1421 | |
ba2940ce |
1422 | /* Since we are releasing the lock here, we need to tell other |
1423 | * people that it is ok to go ahead and use it */ |
7473853a |
1424 | COND_SIGNAL(&ul->lock.cond); |
1425 | COND_WAIT(user_condition, &ul->lock.mutex); |
ba2940ce |
1426 | while (ul->lock.owner != NULL) { |
7473853a |
1427 | /* OK -- must reacquire the lock */ |
1428 | COND_WAIT(&ul->lock.cond, &ul->lock.mutex); |
1429 | } |
1430 | ul->lock.owner = aTHX; |
1431 | ul->lock.locks = locks; |
1432 | MUTEX_UNLOCK(&ul->lock.mutex); |
1433 | |
a0e036c1 |
1434 | |
1435 | int |
7473853a |
1436 | cond_timedwait(SV *ref_cond, double abs, SV *ref_lock = 0) |
1437 | PROTOTYPE: \[$@%]$;\[$@%] |
1438 | PREINIT: |
1439 | SV *ssv; |
1440 | perl_cond* user_condition; |
1441 | int locks; |
1442 | user_lock *ul; |
1443 | CODE: |
1444 | if (! SvROK(ref_cond)) |
1445 | Perl_croak(aTHX_ "Argument to cond_timedwait needs to be passed as ref"); |
1446 | ref_cond = SvRV(ref_cond); |
1447 | if (SvROK(ref_cond)) |
1448 | ref_cond = SvRV(ref_cond); |
1449 | ssv = Perl_sharedsv_find(aTHX_ ref_cond); |
1450 | if (! ssv) |
1451 | Perl_croak(aTHX_ "cond_timedwait can only be used on shared values"); |
1452 | ul = S_get_userlock(aTHX_ ssv, 1); |
1453 | |
1454 | user_condition = &ul->user_cond; |
1455 | if (ref_lock && (ref_cond != ref_lock)) { |
1456 | if (! SvROK(ref_lock)) |
1457 | Perl_croak(aTHX_ "cond_timedwait lock needs to be passed as ref"); |
1458 | ref_lock = SvRV(ref_lock); |
1459 | if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock); |
1460 | ssv = Perl_sharedsv_find(aTHX_ ref_lock); |
1461 | if (! ssv) |
1462 | Perl_croak(aTHX_ "cond_timedwait lock must be a shared value"); |
1463 | ul = S_get_userlock(aTHX_ ssv, 1); |
1464 | } |
1465 | if (ul->lock.owner != aTHX) |
1466 | Perl_croak(aTHX_ "You need a lock before you can cond_wait"); |
1467 | |
1468 | MUTEX_LOCK(&ul->lock.mutex); |
1469 | ul->lock.owner = NULL; |
1470 | locks = ul->lock.locks; |
1471 | ul->lock.locks = 0; |
ba2940ce |
1472 | /* Since we are releasing the lock here, we need to tell other |
1473 | * people that it is ok to go ahead and use it */ |
7473853a |
1474 | COND_SIGNAL(&ul->lock.cond); |
1475 | RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &ul->lock.mutex, abs); |
1476 | while (ul->lock.owner != NULL) { |
1477 | /* OK -- must reacquire the lock... */ |
1478 | COND_WAIT(&ul->lock.cond, &ul->lock.mutex); |
1479 | } |
1480 | ul->lock.owner = aTHX; |
1481 | ul->lock.locks = locks; |
1482 | MUTEX_UNLOCK(&ul->lock.mutex); |
1483 | |
1484 | if (RETVAL == 0) |
a0e036c1 |
1485 | XSRETURN_UNDEF; |
7473853a |
1486 | OUTPUT: |
1487 | RETVAL |
a0e036c1 |
1488 | |
29ecdb6f |
1489 | |
7473853a |
1490 | void |
39ec4146 |
1491 | cond_signal(SV *myref) |
7473853a |
1492 | PROTOTYPE: \[$@%] |
1493 | PREINIT: |
1494 | SV *ssv; |
1495 | user_lock *ul; |
1496 | CODE: |
39ec4146 |
1497 | if (! SvROK(myref)) |
56fcff86 |
1498 | Perl_croak(aTHX_ "Argument to cond_signal needs to be passed as ref"); |
39ec4146 |
1499 | myref = SvRV(myref); |
1500 | if (SvROK(myref)) |
1501 | myref = SvRV(myref); |
1502 | ssv = Perl_sharedsv_find(aTHX_ myref); |
7473853a |
1503 | if (! ssv) |
1504 | Perl_croak(aTHX_ "cond_signal can only be used on shared values"); |
1505 | ul = S_get_userlock(aTHX_ ssv, 1); |
1506 | if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) { |
1507 | Perl_warner(aTHX_ packWARN(WARN_THREADS), |
1508 | "cond_signal() called on unlocked variable"); |
1509 | } |
1510 | COND_SIGNAL(&ul->user_cond); |
6f942b98 |
1511 | |
29ecdb6f |
1512 | |
7473853a |
1513 | void |
39ec4146 |
1514 | cond_broadcast(SV *myref) |
7473853a |
1515 | PROTOTYPE: \[$@%] |
1516 | PREINIT: |
1517 | SV *ssv; |
1518 | user_lock *ul; |
1519 | CODE: |
39ec4146 |
1520 | if (! SvROK(myref)) |
56fcff86 |
1521 | Perl_croak(aTHX_ "Argument to cond_broadcast needs to be passed as ref"); |
39ec4146 |
1522 | myref = SvRV(myref); |
1523 | if (SvROK(myref)) |
1524 | myref = SvRV(myref); |
1525 | ssv = Perl_sharedsv_find(aTHX_ myref); |
7473853a |
1526 | if (! ssv) |
1527 | Perl_croak(aTHX_ "cond_broadcast can only be used on shared values"); |
1528 | ul = S_get_userlock(aTHX_ ssv, 1); |
1529 | if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) { |
1530 | Perl_warner(aTHX_ packWARN(WARN_THREADS), |
1531 | "cond_broadcast() called on unlocked variable"); |
1532 | } |
1533 | COND_BROADCAST(&ul->user_cond); |
1534 | |
1535 | |
1536 | void |
39ec4146 |
1537 | bless(SV* myref, ...); |
7473853a |
1538 | PROTOTYPE: $;$ |
1539 | PREINIT: |
1540 | HV* stash; |
1541 | SV *ssv; |
1542 | CODE: |
1543 | if (items == 1) { |
1544 | stash = CopSTASH(PL_curcop); |
1545 | } else { |
1546 | SV* classname = ST(1); |
1547 | STRLEN len; |
1548 | char *ptr; |
1549 | |
1550 | if (classname && |
1551 | ! SvGMAGICAL(classname) && |
1552 | ! SvAMAGIC(classname) && |
1553 | SvROK(classname)) |
1554 | { |
1555 | Perl_croak(aTHX_ "Attempt to bless into a reference"); |
1556 | } |
1557 | ptr = SvPV(classname, len); |
1558 | if (ckWARN(WARN_MISC) && len == 0) { |
1559 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
1560 | "Explicit blessing to '' (assuming package main)"); |
1561 | } |
1562 | stash = gv_stashpvn(ptr, len, TRUE); |
1563 | } |
39ec4146 |
1564 | SvREFCNT_inc_void(myref); |
1565 | (void)sv_bless(myref, stash); |
1566 | ST(0) = sv_2mortal(myref); |
1567 | ssv = Perl_sharedsv_find(aTHX_ myref); |
7473853a |
1568 | if (ssv) { |
1569 | dTHXc; |
1570 | ENTER_LOCK; |
1571 | SHARED_CONTEXT; |
1572 | { |
1573 | SV* fake_stash = newSVpv(HvNAME_get(stash), 0); |
1574 | (void)sv_bless(ssv, (HV*)fake_stash); |
1575 | } |
1576 | CALLER_CONTEXT; |
1577 | LEAVE_LOCK; |
1578 | } |
1579 | /* XSRETURN(1); - implied */ |
5c360ac5 |
1580 | |
73e09c8f |
1581 | #endif /* USE_ITHREADS */ |
1582 | |
68795e93 |
1583 | BOOT: |
1584 | { |
73e09c8f |
1585 | #ifdef USE_ITHREADS |
68795e93 |
1586 | Perl_sharedsv_init(aTHX); |
73e09c8f |
1587 | #endif /* USE_ITHREADS */ |
68795e93 |
1588 | } |