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Comparing Coro/Coro/State.xs (file contents):
Revision 1.269 by root, Fri Nov 14 06:50:11 2008 UTC vs.
Revision 1.283 by root, Sun Nov 16 11:12:57 2008 UTC

… …
142#define NOINLINE attribute ((noinline)) 142#define NOINLINE attribute ((noinline))
143 143
144#include "CoroAPI.h" 144#include "CoroAPI.h"
145 145
146#ifdef USE_ITHREADS 146#ifdef USE_ITHREADS
147
148static perl_mutex coro_lock;
149# define LOCK do { MUTEX_LOCK (&coro_lock); } while (0)
150# define UNLOCK do { MUTEX_UNLOCK (&coro_lock); } while (0)
151# if CORO_PTHREAD 147# if CORO_PTHREAD
152static void *coro_thx; 148static void *coro_thx;
153# endif 149# endif
154
155#else
156
157# define LOCK (void)0
158# define UNLOCK (void)0
159
160#endif 150#endif
161
162# undef LOCK
163# define LOCK (void)0
164# undef UNLOCK
165# define UNLOCK (void)0
166 151
167/* helper storage struct for Coro::AIO */ 152/* helper storage struct for Coro::AIO */
168struct io_state 153struct io_state
169{ 154{
170 AV *res; 155 AV *res;
… …
181static struct CoroAPI coroapi; 166static struct CoroAPI coroapi;
182static AV *main_mainstack; /* used to differentiate between $main and others */ 167static AV *main_mainstack; /* used to differentiate between $main and others */
183static JMPENV *main_top_env; 168static JMPENV *main_top_env;
184static HV *coro_state_stash, *coro_stash; 169static HV *coro_state_stash, *coro_stash;
185static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */ 170static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
186static volatile struct coro *transfer_next;
187
188struct transfer_args
189{
190 struct coro *prev, *next;
191};
192 171
193static GV *irsgv; /* $/ */ 172static GV *irsgv; /* $/ */
194static GV *stdoutgv; /* *STDOUT */ 173static GV *stdoutgv; /* *STDOUT */
195static SV *rv_diehook; 174static SV *rv_diehook;
196static SV *rv_warnhook; 175static SV *rv_warnhook;
… …
215 CC_TRACE_LINE = 0x10, /* trace each statement */ 194 CC_TRACE_LINE = 0x10, /* trace each statement */
216 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE, 195 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
217}; 196};
218 197
219/* this is a structure representing a c-level coroutine */ 198/* this is a structure representing a c-level coroutine */
220typedef struct coro_cctx { 199typedef struct coro_cctx
200{
221 struct coro_cctx *next; 201 struct coro_cctx *next;
222 202
223 /* the stack */ 203 /* the stack */
224 void *sptr; 204 void *sptr;
225 size_t ssize; 205 size_t ssize;
… …
243 CF_NEW = 0x0004, /* has never been switched to */ 223 CF_NEW = 0x0004, /* has never been switched to */
244 CF_DESTROYED = 0x0008, /* coroutine data has been freed */ 224 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
245}; 225};
246 226
247/* the structure where most of the perl state is stored, overlaid on the cxstack */ 227/* the structure where most of the perl state is stored, overlaid on the cxstack */
248typedef struct { 228typedef struct
229{
249 SV *defsv; 230 SV *defsv;
250 AV *defav; 231 AV *defav;
251 SV *errsv; 232 SV *errsv;
252 SV *irsgv; 233 SV *irsgv;
253#define VAR(name,type) type name; 234#define VAR(name,type) type name;
… …
257 238
258#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT)) 239#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
259 240
260/* this is a structure representing a perl-level coroutine */ 241/* this is a structure representing a perl-level coroutine */
261struct coro { 242struct coro {
262 /* the c coroutine allocated to this perl coroutine, if any */ 243 /* the C coroutine allocated to this perl coroutine, if any */
263 coro_cctx *cctx; 244 coro_cctx *cctx;
264 245
265 /* process data */ 246 /* process data */
247 struct CoroSLF slf_frame; /* saved slf frame */
266 AV *mainstack; 248 AV *mainstack;
267 perl_slots *slot; /* basically the saved sp */ 249 perl_slots *slot; /* basically the saved sp */
268 250
269 AV *args; /* data associated with this coroutine (initial args) */ 251 AV *args; /* data associated with this coroutine (initial args) */
270 int refcnt; /* coroutines are refcounted, yes */ 252 int refcnt; /* coroutines are refcounted, yes */
271 int flags; /* CF_ flags */ 253 int flags; /* CF_ flags */
272 HV *hv; /* the perl hash associated with this coro, if any */ 254 HV *hv; /* the perl hash associated with this coro, if any */
255 void (*on_destroy)(pTHX_ struct coro *coro);
273 256
274 /* statistics */ 257 /* statistics */
275 int usecount; /* number of transfers to this coro */ 258 int usecount; /* number of transfers to this coro */
276 259
277 /* coro process data */ 260 /* coro process data */
… …
285 struct coro *next, *prev; 268 struct coro *next, *prev;
286}; 269};
287 270
288typedef struct coro *Coro__State; 271typedef struct coro *Coro__State;
289typedef struct coro *Coro__State_or_hashref; 272typedef struct coro *Coro__State_or_hashref;
273
274static struct CoroSLF slf_frame; /* the current slf frame */
290 275
291/** Coro ********************************************************************/ 276/** Coro ********************************************************************/
292 277
293#define PRIO_MAX 3 278#define PRIO_MAX 3
294#define PRIO_HIGH 1 279#define PRIO_HIGH 1
… …
299 284
300/* for Coro.pm */ 285/* for Coro.pm */
301static SV *coro_current; 286static SV *coro_current;
302static SV *coro_readyhook; 287static SV *coro_readyhook;
303static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1]; 288static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
304static int coro_nready;
305static struct coro *coro_first; 289static struct coro *coro_first;
290#define coro_nready coroapi.nready
306 291
307/** lowlevel stuff **********************************************************/ 292/** lowlevel stuff **********************************************************/
308 293
309static SV * 294static SV *
310coro_get_sv (pTHX_ const char *name, int create) 295coro_get_sv (pTHX_ const char *name, int create)
… …
403static MGVTBL coro_cv_vtbl = { 388static MGVTBL coro_cv_vtbl = {
404 0, 0, 0, 0, 389 0, 0, 0, 0,
405 coro_cv_free 390 coro_cv_free
406}; 391};
407 392
408#define CORO_MAGIC(sv, type) \ 393#define CORO_MAGIC(sv, type) \
409 SvMAGIC (sv) \ 394 expect_true (SvMAGIC (sv)) \
410 ? SvMAGIC (sv)->mg_type == type \ 395 ? expect_true (SvMAGIC (sv)->mg_type == type) \
411 ? SvMAGIC (sv) \ 396 ? SvMAGIC (sv) \
412 : mg_find (sv, type) \ 397 : mg_find (sv, type) \
413 : 0 398 : 0
414 399
415#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv) 400#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
416#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state) 401#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
417 402
… …
438 mg = CORO_MAGIC_state (coro); 423 mg = CORO_MAGIC_state (coro);
439 return (struct coro *)mg->mg_ptr; 424 return (struct coro *)mg->mg_ptr;
440} 425}
441 426
442#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv)) 427#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
428
429/* fastert than SvSTATE, but expects a coroutine hv */
430INLINE struct coro *
431SvSTATE_hv (SV *sv)
432{
433 MAGIC *mg = expect_true (SvMAGIC (sv)->mg_type == CORO_MAGIC_type_state)
434 ? SvMAGIC (sv)
435 : mg_find (sv, CORO_MAGIC_type_state);
436
437 return (struct coro *)mg->mg_ptr;
438}
439
440#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
443 441
444/* the next two functions merely cache the padlists */ 442/* the next two functions merely cache the padlists */
445static void 443static void
446get_padlist (pTHX_ CV *cv) 444get_padlist (pTHX_ CV *cv)
447{ 445{
… …
514 CvPADLIST (cv) = (AV *)POPs; 512 CvPADLIST (cv) = (AV *)POPs;
515 } 513 }
516 514
517 PUTBACK; 515 PUTBACK;
518 } 516 }
517
518 slf_frame = c->slf_frame;
519} 519}
520 520
521static void 521static void
522save_perl (pTHX_ Coro__State c) 522save_perl (pTHX_ Coro__State c)
523{ 523{
524 c->slf_frame = slf_frame;
525
524 { 526 {
525 dSP; 527 dSP;
526 I32 cxix = cxstack_ix; 528 I32 cxix = cxstack_ix;
527 PERL_CONTEXT *ccstk = cxstack; 529 PERL_CONTEXT *ccstk = cxstack;
528 PERL_SI *top_si = PL_curstackinfo; 530 PERL_SI *top_si = PL_curstackinfo;
… …
595 #undef VAR 597 #undef VAR
596 } 598 }
597} 599}
598 600
599/* 601/*
600 * allocate various perl stacks. This is an exact copy 602 * allocate various perl stacks. This is almost an exact copy
601 * of perl.c:init_stacks, except that it uses less memory 603 * of perl.c:init_stacks, except that it uses less memory
602 * on the (sometimes correct) assumption that coroutines do 604 * on the (sometimes correct) assumption that coroutines do
603 * not usually need a lot of stackspace. 605 * not usually need a lot of stackspace.
604 */ 606 */
605#if CORO_PREFER_PERL_FUNCTIONS 607#if CORO_PREFER_PERL_FUNCTIONS
… …
712#endif 714#endif
713 } 715 }
714 } 716 }
715 717
716 return rss; 718 return rss;
717}
718
719/** set stacklevel support **************************************************/
720
721/* we sometimes need to create the effect of pp_slf calling us */
722#define SLF_HEAD (void)0
723/* we sometimes need to create the effect of leaving via pp_slf */
724#define SLF_TAIL slf_tail (aTHX)
725
726INLINE void
727slf_tail (pTHX)
728{
729 dSP;
730 SV **bot = SP;
731
732 int gimme = GIMME_V;
733
734 /* make sure we put something on the stack in scalar context */
735 if (gimme == G_SCALAR)
736 {
737 if (sp == bot)
738 XPUSHs (&PL_sv_undef);
739
740 SP = bot + 1;
741 }
742
743 PUTBACK;
744} 719}
745 720
746/** coroutine stack handling ************************************************/ 721/** coroutine stack handling ************************************************/
747 722
748static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg); 723static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
… …
834 809
835 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0; 810 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
836} 811}
837 812
838static void 813static void
814prepare_nop (pTHX_ struct coro_transfer_args *ta)
815{
816 /* kind of mega-hacky, but works */
817 ta->next = ta->prev = (struct coro *)ta;
818}
819
820static int
821slf_check_nop (pTHX_ struct CoroSLF *frame)
822{
823 return 0;
824}
825
826static void
839coro_setup (pTHX_ struct coro *coro) 827coro_setup (pTHX_ struct coro *coro)
840{ 828{
841 /* 829 /*
842 * emulate part of the perl startup here. 830 * emulate part of the perl startup here.
843 */ 831 */
… …
882 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX); 870 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
883 SPAGAIN; 871 SPAGAIN;
884 } 872 }
885 873
886 /* this newly created coroutine might be run on an existing cctx which most 874 /* this newly created coroutine might be run on an existing cctx which most
887 * likely was suspended in set_stacklevel, called from pp_set_stacklevel, 875 * likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
888 * so we have to emulate entering pp_set_stacklevel here.
889 */ 876 */
890 SLF_HEAD; 877 slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
878 slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
891} 879}
892 880
893static void 881static void
894coro_destruct (pTHX_ struct coro *coro) 882coro_destruct (pTHX_ struct coro *coro)
895{ 883{
… …
939static int 927static int
940runops_trace (pTHX) 928runops_trace (pTHX)
941{ 929{
942 COP *oldcop = 0; 930 COP *oldcop = 0;
943 int oldcxix = -2; 931 int oldcxix = -2;
944 struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */ 932 struct coro *coro = SvSTATE_current; /* trace cctx is tied to specific coro */
945 coro_cctx *cctx = coro->cctx; 933 coro_cctx *cctx = coro->cctx;
946 934
947 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX))) 935 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
948 { 936 {
949 PERL_ASYNC_CHECK (); 937 PERL_ASYNC_CHECK ();
… …
1059 TAINT_NOT; 1047 TAINT_NOT;
1060 return 0; 1048 return 0;
1061} 1049}
1062 1050
1063static void 1051static void
1064prepare_set_stacklevel (struct transfer_args *ta, struct coro_cctx *cctx) 1052prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1065{ 1053{
1066 ta->prev = (struct coro *)cctx; 1054 ta->prev = (struct coro *)cctx;
1067 ta->next = 0; 1055 ta->next = 0;
1068} 1056}
1069 1057
… …
1098 1086
1099/* the tail of transfer: execute stuff we can only do after a transfer */ 1087/* the tail of transfer: execute stuff we can only do after a transfer */
1100INLINE void 1088INLINE void
1101transfer_tail (pTHX) 1089transfer_tail (pTHX)
1102{ 1090{
1103 struct coro *next = (struct coro *)transfer_next;
1104 assert (!(transfer_next = 0)); /* just used for the side effect when asserts are enabled */
1105 assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));
1106
1107 free_coro_mortal (aTHX); 1091 free_coro_mortal (aTHX);
1108 UNLOCK;
1109
1110 if (expect_false (next->throw))
1111 {
1112 SV *exception = sv_2mortal (next->throw);
1113
1114 next->throw = 0;
1115 sv_setsv (ERRSV, exception);
1116 croak (0);
1117 }
1118} 1092}
1119 1093
1120/* 1094/*
1121 * this is a _very_ stripped down perl interpreter ;) 1095 * this is a _very_ stripped down perl interpreter ;)
1122 */ 1096 */
… …
1129# endif 1103# endif
1130#endif 1104#endif
1131 { 1105 {
1132 dTHX; 1106 dTHX;
1133 1107
1134 /* we are the alternative tail to pp_set_stacklevel */ 1108 /* normally we would need to skip the entersub here */
1135 /* so do the same things here */ 1109 /* not doing so will re-execute it, which is exactly what we want */
1136 SLF_TAIL;
1137
1138 /* we now skip the op that did lead to transfer() */
1139 PL_op = PL_op->op_next; 1110 /* PL_nop = PL_nop->op_next */
1140 1111
1141 /* inject a fake subroutine call to cctx_init */ 1112 /* inject a fake subroutine call to cctx_init */
1142 cctx_prepare (aTHX_ (coro_cctx *)arg); 1113 cctx_prepare (aTHX_ (coro_cctx *)arg);
1143 1114
1144 /* cctx_run is the alternative tail of transfer() */ 1115 /* cctx_run is the alternative tail of transfer() */
… …
1308transfer_check (pTHX_ struct coro *prev, struct coro *next) 1279transfer_check (pTHX_ struct coro *prev, struct coro *next)
1309{ 1280{
1310 if (expect_true (prev != next)) 1281 if (expect_true (prev != next))
1311 { 1282 {
1312 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW)))) 1283 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1313 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states"); 1284 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1314 1285
1315 if (expect_false (next->flags & CF_RUNNING)) 1286 if (expect_false (next->flags & CF_RUNNING))
1316 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states"); 1287 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1317 1288
1318 if (expect_false (next->flags & CF_DESTROYED)) 1289 if (expect_false (next->flags & CF_DESTROYED))
1319 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states"); 1290 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1320 1291
1321#if !PERL_VERSION_ATLEAST (5,10,0) 1292#if !PERL_VERSION_ATLEAST (5,10,0)
1322 if (expect_false (PL_lex_state != LEX_NOTPARSING)) 1293 if (expect_false (PL_lex_state != LEX_NOTPARSING))
1323 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version"); 1294 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1324#endif 1295#endif
1325 } 1296 }
1326} 1297}
1327 1298
1328/* always use the TRANSFER macro */ 1299/* always use the TRANSFER macro */
… …
1332 dSTACKLEVEL; 1303 dSTACKLEVEL;
1333 1304
1334 /* sometimes transfer is only called to set idle_sp */ 1305 /* sometimes transfer is only called to set idle_sp */
1335 if (expect_false (!next)) 1306 if (expect_false (!next))
1336 { 1307 {
1337 ((coro_cctx *)prev)->idle_sp = stacklevel; 1308 ((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1338 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */ 1309 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1339 } 1310 }
1340 else if (expect_true (prev != next)) 1311 else if (expect_true (prev != next))
1341 { 1312 {
1342 coro_cctx *prev__cctx; 1313 coro_cctx *prev__cctx;
… …
1349 prev->flags |= CF_RUNNING; 1320 prev->flags |= CF_RUNNING;
1350 } 1321 }
1351 1322
1352 prev->flags &= ~CF_RUNNING; 1323 prev->flags &= ~CF_RUNNING;
1353 next->flags |= CF_RUNNING; 1324 next->flags |= CF_RUNNING;
1354
1355 LOCK;
1356 1325
1357 /* first get rid of the old state */ 1326 /* first get rid of the old state */
1358 save_perl (aTHX_ prev); 1327 save_perl (aTHX_ prev);
1359 1328
1360 if (expect_false (next->flags & CF_NEW)) 1329 if (expect_false (next->flags & CF_NEW))
… …
1369 1338
1370 prev__cctx = prev->cctx; 1339 prev__cctx = prev->cctx;
1371 1340
1372 /* possibly untie and reuse the cctx */ 1341 /* possibly untie and reuse the cctx */
1373 if (expect_true ( 1342 if (expect_true (
1374 prev__cctx->idle_sp == stacklevel 1343 prev__cctx->idle_sp == (void *)stacklevel
1375 && !(prev__cctx->flags & CC_TRACE) 1344 && !(prev__cctx->flags & CC_TRACE)
1376 && !force_cctx 1345 && !force_cctx
1377 )) 1346 ))
1378 { 1347 {
1379 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */ 1348 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */
… …
1393 ++next->usecount; 1362 ++next->usecount;
1394 1363
1395 if (expect_true (!next->cctx)) 1364 if (expect_true (!next->cctx))
1396 next->cctx = cctx_get (aTHX); 1365 next->cctx = cctx_get (aTHX);
1397 1366
1398 assert (("FATAL: transfer_next already nonzero in Coro (please report)", !transfer_next));
1399 transfer_next = next;
1400
1401 if (expect_false (prev__cctx != next->cctx)) 1367 if (expect_false (prev__cctx != next->cctx))
1402 { 1368 {
1403 prev__cctx->top_env = PL_top_env; 1369 prev__cctx->top_env = PL_top_env;
1404 PL_top_env = next->cctx->top_env; 1370 PL_top_env = next->cctx->top_env;
1405 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx); 1371 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
… …
1418coro_state_destroy (pTHX_ struct coro *coro) 1384coro_state_destroy (pTHX_ struct coro *coro)
1419{ 1385{
1420 if (coro->flags & CF_DESTROYED) 1386 if (coro->flags & CF_DESTROYED)
1421 return 0; 1387 return 0;
1422 1388
1389 if (coro->on_destroy)
1390 coro->on_destroy (aTHX_ coro);
1391
1423 coro->flags |= CF_DESTROYED; 1392 coro->flags |= CF_DESTROYED;
1424 1393
1425 if (coro->flags & CF_READY) 1394 if (coro->flags & CF_READY)
1426 { 1395 {
1427 /* reduce nready, as destroying a ready coro effectively unreadies it */ 1396 /* reduce nready, as destroying a ready coro effectively unreadies it */
1428 /* alternative: look through all ready queues and remove the coro */ 1397 /* alternative: look through all ready queues and remove the coro */
1429 LOCK;
1430 --coro_nready; 1398 --coro_nready;
1431 UNLOCK;
1432 } 1399 }
1433 else 1400 else
1434 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */ 1401 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1435 1402
1436 if (coro->mainstack && coro->mainstack != main_mainstack) 1403 if (coro->mainstack && coro->mainstack != main_mainstack)
1437 { 1404 {
1438 struct coro temp; 1405 struct coro temp;
1439 1406
1440 if (coro->flags & CF_RUNNING) 1407 assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1441 croak ("FATAL: tried to destroy currently running coroutine");
1442 1408
1443 save_perl (aTHX_ &temp); 1409 save_perl (aTHX_ &temp);
1444 load_perl (aTHX_ coro); 1410 load_perl (aTHX_ coro);
1445 1411
1446 coro_destruct (aTHX_ coro); 1412 coro_destruct (aTHX_ coro);
… …
1497# define MGf_DUP 0 1463# define MGf_DUP 0
1498#endif 1464#endif
1499}; 1465};
1500 1466
1501static void 1467static void
1502prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv) 1468prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1503{ 1469{
1504 ta->prev = SvSTATE (prev_sv); 1470 ta->prev = SvSTATE (prev_sv);
1505 ta->next = SvSTATE (next_sv); 1471 ta->next = SvSTATE (next_sv);
1506 TRANSFER_CHECK (*ta); 1472 TRANSFER_CHECK (*ta);
1507} 1473}
1508 1474
1509static void 1475static void
1510api_transfer (SV *prev_sv, SV *next_sv) 1476api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1511{ 1477{
1512 dTHX;
1513 struct transfer_args ta; 1478 struct coro_transfer_args ta;
1514 1479
1515 prepare_transfer (aTHX_ &ta, prev_sv, next_sv); 1480 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1516 TRANSFER (ta, 1); 1481 TRANSFER (ta, 1);
1517} 1482}
1518 1483
1519/** Coro ********************************************************************/ 1484/** Coro ********************************************************************/
1520 1485
1521static void 1486INLINE void
1522coro_enq (pTHX_ SV *coro_sv) 1487coro_enq (pTHX_ struct coro *coro)
1523{ 1488{
1524 av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv); 1489 av_push (coro_ready [coro->prio - PRIO_MIN], SvREFCNT_inc_NN (coro->hv));
1525} 1490}
1526 1491
1527static SV * 1492INLINE SV *
1528coro_deq (pTHX) 1493coro_deq (pTHX)
1529{ 1494{
1530 int prio; 1495 int prio;
1531 1496
1532 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; ) 1497 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
… …
1535 1500
1536 return 0; 1501 return 0;
1537} 1502}
1538 1503
1539static int 1504static int
1540api_ready (SV *coro_sv) 1505api_ready (pTHX_ SV *coro_sv)
1541{ 1506{
1542 dTHX;
1543 struct coro *coro; 1507 struct coro *coro;
1544 SV *sv_hook; 1508 SV *sv_hook;
1545 void (*xs_hook)(void); 1509 void (*xs_hook)(void);
1546 1510
1547 if (SvROK (coro_sv)) 1511 if (SvROK (coro_sv))
… …
1552 if (coro->flags & CF_READY) 1516 if (coro->flags & CF_READY)
1553 return 0; 1517 return 0;
1554 1518
1555 coro->flags |= CF_READY; 1519 coro->flags |= CF_READY;
1556 1520
1557 LOCK;
1558
1559 sv_hook = coro_nready ? 0 : coro_readyhook; 1521 sv_hook = coro_nready ? 0 : coro_readyhook;
1560 xs_hook = coro_nready ? 0 : coroapi.readyhook; 1522 xs_hook = coro_nready ? 0 : coroapi.readyhook;
1561 1523
1562 coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv)); 1524 coro_enq (aTHX_ coro);
1563 ++coro_nready; 1525 ++coro_nready;
1564 1526
1565 UNLOCK;
1566
1567 if (sv_hook) 1527 if (sv_hook)
1568 { 1528 {
1569 dSP; 1529 dSP;
1570 1530
1571 ENTER; 1531 ENTER;
… …
1585 1545
1586 return 1; 1546 return 1;
1587} 1547}
1588 1548
1589static int 1549static int
1590api_is_ready (SV *coro_sv) 1550api_is_ready (pTHX_ SV *coro_sv)
1591{ 1551{
1592 dTHX;
1593
1594 return !!(SvSTATE (coro_sv)->flags & CF_READY); 1552 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1595} 1553}
1596 1554
1597INLINE void 1555INLINE void
1598prepare_schedule (pTHX_ struct transfer_args *ta) 1556prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1599{ 1557{
1600 SV *prev_sv, *next_sv; 1558 SV *prev_sv, *next_sv;
1601 1559
1602 for (;;) 1560 for (;;)
1603 { 1561 {
1604 LOCK;
1605 next_sv = coro_deq (aTHX); 1562 next_sv = coro_deq (aTHX);
1606 1563
1607 /* nothing to schedule: call the idle handler */ 1564 /* nothing to schedule: call the idle handler */
1608 if (expect_false (!next_sv)) 1565 if (expect_false (!next_sv))
1609 { 1566 {
1610 dSP; 1567 dSP;
1611 UNLOCK;
1612 1568
1613 ENTER; 1569 ENTER;
1614 SAVETMPS; 1570 SAVETMPS;
1615 1571
1616 PUSHMARK (SP); 1572 PUSHMARK (SP);
… …
1621 FREETMPS; 1577 FREETMPS;
1622 LEAVE; 1578 LEAVE;
1623 continue; 1579 continue;
1624 } 1580 }
1625 1581
1626 ta->next = SvSTATE (next_sv); 1582 ta->next = SvSTATE_hv (next_sv);
1627 1583
1628 /* cannot transfer to destroyed coros, skip and look for next */ 1584 /* cannot transfer to destroyed coros, skip and look for next */
1629 if (expect_false (ta->next->flags & CF_DESTROYED)) 1585 if (expect_false (ta->next->flags & CF_DESTROYED))
1630 { 1586 {
1631 UNLOCK;
1632 SvREFCNT_dec (next_sv); 1587 SvREFCNT_dec (next_sv);
1633 /* coro_nready has already been taken care of by destroy */ 1588 /* coro_nready has already been taken care of by destroy */
1634 continue; 1589 continue;
1635 } 1590 }
1636 1591
1637 --coro_nready; 1592 --coro_nready;
1638 UNLOCK;
1639 break; 1593 break;
1640 } 1594 }
1641 1595
1642 /* free this only after the transfer */ 1596 /* free this only after the transfer */
1643 prev_sv = SvRV (coro_current); 1597 prev_sv = SvRV (coro_current);
1644 ta->prev = SvSTATE (prev_sv); 1598 ta->prev = SvSTATE_hv (prev_sv);
1645 TRANSFER_CHECK (*ta); 1599 TRANSFER_CHECK (*ta);
1646 assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY)); 1600 assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1647 ta->next->flags &= ~CF_READY; 1601 ta->next->flags &= ~CF_READY;
1648 SvRV_set (coro_current, next_sv); 1602 SvRV_set (coro_current, next_sv);
1649 1603
1650 LOCK;
1651 free_coro_mortal (aTHX); 1604 free_coro_mortal (aTHX);
1652 coro_mortal = prev_sv; 1605 coro_mortal = prev_sv;
1653 UNLOCK;
1654} 1606}
1655 1607
1656INLINE void 1608INLINE void
1657prepare_cede (pTHX_ struct transfer_args *ta) 1609prepare_cede (pTHX_ struct coro_transfer_args *ta)
1658{ 1610{
1659 api_ready (coro_current); 1611 api_ready (aTHX_ coro_current);
1660 prepare_schedule (aTHX_ ta); 1612 prepare_schedule (aTHX_ ta);
1661} 1613}
1662 1614
1663static void 1615INLINE void
1664prepare_cede_notself (pTHX_ struct transfer_args *ta) 1616prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1665{ 1617{
1666 SV *prev = SvRV (coro_current); 1618 SV *prev = SvRV (coro_current);
1667 1619
1668 if (coro_nready) 1620 if (coro_nready)
1669 { 1621 {
1670 prepare_schedule (aTHX_ ta); 1622 prepare_schedule (aTHX_ ta);
1671 api_ready (prev); 1623 api_ready (aTHX_ prev);
1672 } 1624 }
1673 else 1625 else
1674 ta->prev = ta->next = SvSTATE (prev); 1626 prepare_nop (aTHX_ ta);
1675} 1627}
1676 1628
1677static void 1629static void
1678api_schedule (void) 1630api_schedule (pTHX)
1679{ 1631{
1680 dTHX;
1681 struct transfer_args ta; 1632 struct coro_transfer_args ta;
1682 1633
1683 prepare_schedule (aTHX_ &ta); 1634 prepare_schedule (aTHX_ &ta);
1684 TRANSFER (ta, 1); 1635 TRANSFER (ta, 1);
1685} 1636}
1686 1637
1687static int 1638static int
1688api_cede (void) 1639api_cede (pTHX)
1689{ 1640{
1690 dTHX;
1691 struct transfer_args ta; 1641 struct coro_transfer_args ta;
1692 1642
1693 prepare_cede (aTHX_ &ta); 1643 prepare_cede (aTHX_ &ta);
1694 1644
1695 if (expect_true (ta.prev != ta.next)) 1645 if (expect_true (ta.prev != ta.next))
1696 { 1646 {
… …
1700 else 1650 else
1701 return 0; 1651 return 0;
1702} 1652}
1703 1653
1704static int 1654static int
1705api_cede_notself (void) 1655api_cede_notself (pTHX)
1706{ 1656{
1707 if (coro_nready) 1657 if (coro_nready)
1708 { 1658 {
1709 dTHX;
1710 struct transfer_args ta; 1659 struct coro_transfer_args ta;
1711 1660
1712 prepare_cede_notself (aTHX_ &ta); 1661 prepare_cede_notself (aTHX_ &ta);
1713 TRANSFER (ta, 1); 1662 TRANSFER (ta, 1);
1714 return 1; 1663 return 1;
1715 } 1664 }
1716 else 1665 else
1717 return 0; 1666 return 0;
1718} 1667}
1719 1668
1720static void 1669static void
1721api_trace (SV *coro_sv, int flags) 1670api_trace (pTHX_ SV *coro_sv, int flags)
1722{ 1671{
1723 dTHX;
1724 struct coro *coro = SvSTATE (coro_sv); 1672 struct coro *coro = SvSTATE (coro_sv);
1725 1673
1726 if (flags & CC_TRACE) 1674 if (flags & CC_TRACE)
1727 { 1675 {
1728 if (!coro->cctx) 1676 if (!coro->cctx)
1729 coro->cctx = cctx_new_run (); 1677 coro->cctx = cctx_new_run ();
1730 else if (!(coro->cctx->flags & CC_TRACE)) 1678 else if (!(coro->cctx->flags & CC_TRACE))
1731 croak ("cannot enable tracing on coroutine with custom stack"); 1679 croak ("cannot enable tracing on coroutine with custom stack,");
1732 1680
1733 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL)); 1681 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1734 } 1682 }
1735 else if (coro->cctx && coro->cctx->flags & CC_TRACE) 1683 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1736 { 1684 {
… …
1741 else 1689 else
1742 coro->slot->runops = RUNOPS_DEFAULT; 1690 coro->slot->runops = RUNOPS_DEFAULT;
1743 } 1691 }
1744} 1692}
1745 1693
1746#if 0
1747static int
1748coro_gensub_free (pTHX_ SV *sv, MAGIC *mg)
1749{
1750 AV *padlist;
1751 AV *av = (AV *)mg->mg_obj;
1752
1753 abort ();
1754
1755 return 0;
1756}
1757
1758static MGVTBL coro_gensub_vtbl = {
1759 0, 0, 0, 0,
1760 coro_gensub_free
1761};
1762#endif
1763
1764/*****************************************************************************/ 1694/*****************************************************************************/
1765/* PerlIO::cede */ 1695/* PerlIO::cede */
1766 1696
1767typedef struct 1697typedef struct
1768{ 1698{
… …
1795 PerlIOCede *self = PerlIOSelf (f, PerlIOCede); 1725 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1796 double now = nvtime (); 1726 double now = nvtime ();
1797 1727
1798 if (now >= self->next) 1728 if (now >= self->next)
1799 { 1729 {
1800 api_cede (); 1730 api_cede (aTHX);
1801 self->next = now + self->every; 1731 self->next = now + self->every;
1802 } 1732 }
1803 1733
1804 return PerlIOBuf_flush (aTHX_ f); 1734 return PerlIOBuf_flush (aTHX_ f);
1805} 1735}
… …
1841static const CV *slf_cv; /* for quick consistency check */ 1771static const CV *slf_cv; /* for quick consistency check */
1842 1772
1843static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */ 1773static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
1844static SV *slf_arg0; 1774static SV *slf_arg0;
1845static SV *slf_arg1; 1775static SV *slf_arg1;
1776static SV *slf_arg2;
1846 1777
1847/* this restores the stack in the case we patched the entersub, to */ 1778/* this restores the stack in the case we patched the entersub, to */
1848/* recreate the stack frame as perl will on following calls */ 1779/* recreate the stack frame as perl will on following calls */
1849/* since entersub cleared the stack */ 1780/* since entersub cleared the stack */
1850static OP * 1781static OP *
… …
1855 PUSHMARK (SP); 1786 PUSHMARK (SP);
1856 1787
1857 EXTEND (SP, 3); 1788 EXTEND (SP, 3);
1858 if (slf_arg0) PUSHs (sv_2mortal (slf_arg0)); 1789 if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));
1859 if (slf_arg1) PUSHs (sv_2mortal (slf_arg1)); 1790 if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));
1791 if (slf_arg2) PUSHs (sv_2mortal (slf_arg2));
1860 PUSHs ((SV *)CvGV (slf_cv)); 1792 PUSHs ((SV *)CvGV (slf_cv));
1861 1793
1862 RETURNOP (slf_restore.op_first); 1794 RETURNOP (slf_restore.op_first);
1863} 1795}
1864 1796
1865#define OPpENTERSUB_SLF 15 /* the part of op_private entersub hopefully doesn't use */ 1797static void
1798slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
1799{
1800 prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
1801}
1866 1802
1867/* declare prototype */ 1803static void
1868XS(XS_Coro__State__set_stacklevel); 1804slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1805{
1806 assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
1807
1808 frame->prepare = slf_prepare_set_stacklevel;
1809 frame->check = slf_check_nop;
1810 frame->data = (void *)SvIV (arg [0]);
1811}
1812
1813static void
1814slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
1815{
1816 SV **arg = (SV **)slf_frame.data;
1817
1818 prepare_transfer (aTHX_ ta, arg [0], arg [1]);
1819
1820 /* if the destination has ->throw set, then copy it */
1821 /* into the current coro's throw slot, so it will be raised */
1822 /* after the schedule */
1823 if (expect_false (ta->next->throw))
1824 {
1825 struct coro *coro = SvSTATE_current;
1826 SvREFCNT_dec (coro->throw);
1827 coro->throw = ta->next->throw;
1828 ta->next->throw = 0;
1829 }
1830}
1831
1832static void
1833slf_init_transfer (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1834{
1835 if (items != 2)
1836 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
1837
1838 frame->prepare = slf_prepare_transfer;
1839 frame->check = slf_check_nop;
1840 frame->data = (void *)arg; /* let's hope it will stay valid */
1841}
1842
1843static void
1844slf_init_schedule (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1845{
1846 frame->prepare = prepare_schedule;
1847 frame->check = slf_check_nop;
1848}
1849
1850static void
1851slf_init_cede (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1852{
1853 frame->prepare = prepare_cede;
1854 frame->check = slf_check_nop;
1855}
1856
1857static void
1858slf_init_cede_notself (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1859{
1860 frame->prepare = prepare_cede_notself;
1861 frame->check = slf_check_nop;
1862}
1863
1864/* we hijack an hopefully unused CV flag for our purposes */
1865#define CVf_SLF 0x4000
1869 1866
1870/* 1867/*
1871 * these not obviously related functions are all rolled into one 1868 * these not obviously related functions are all rolled into one
1872 * function to increase chances that they all will call transfer with the same 1869 * function to increase chances that they all will call transfer with the same
1873 * stack offset 1870 * stack offset
1874 * SLF stands for "schedule-like-function". 1871 * SLF stands for "schedule-like-function".
1875 */ 1872 */
1876static OP * 1873static OP *
1877pp_slf (pTHX) 1874pp_slf (pTHX)
1878{ 1875{
1876 I32 checkmark; /* mark SP to see how many elements check has pushed */
1877
1878 /* set up the slf frame, unless it has already been set-up */
1879 /* the latter happens when a new coro has been started */
1880 /* or when a new cctx was attached to an existing coroutine */
1881 if (expect_true (!slf_frame.prepare))
1882 {
1883 /* first iteration */
1879 dSP; 1884 dSP;
1880 struct transfer_args ta;
1881 SV **arg = PL_stack_base + TOPMARK + 1; 1885 SV **arg = PL_stack_base + TOPMARK + 1;
1882 int items = SP - arg; /* args without function object */ 1886 int items = SP - arg; /* args without function object */
1887 SV *gv = *sp;
1883 1888
1884 /* do a quick consistency check on the "function" object, and if it isn't */ 1889 /* do a quick consistency check on the "function" object, and if it isn't */
1885 /* for us, divert to the real entersub */ 1890 /* for us, divert to the real entersub */
1886 if (SvTYPE (*sp) != SVt_PVGV || CvXSUB (GvCV (*sp)) != XS_Coro__State__set_stacklevel) 1891 if (SvTYPE (gv) != SVt_PVGV || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
1887 return PL_ppaddr[OP_ENTERSUB](aTHX); 1892 return PL_ppaddr[OP_ENTERSUB](aTHX);
1888 1893
1889 /* pop args */
1890 SP = PL_stack_base + POPMARK;
1891
1892 if (!(PL_op->op_flags & OPf_STACKED)) 1894 if (!(PL_op->op_flags & OPf_STACKED))
1893 { 1895 {
1894 /* ampersand-form of call, use @_ instead of stack */ 1896 /* ampersand-form of call, use @_ instead of stack */
1895 AV *av = GvAV (PL_defgv); 1897 AV *av = GvAV (PL_defgv);
1896 arg = AvARRAY (av); 1898 arg = AvARRAY (av);
1897 items = AvFILLp (av) + 1; 1899 items = AvFILLp (av) + 1;
1900 }
1901
1902 PUTBACK;
1903
1904 /* now call the init function, which needs to set up slf_frame */
1905 ((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr)
1906 (aTHX_ &slf_frame, GvCV (gv), arg, items);
1907
1908 /* pop args */
1909 SP = PL_stack_base + POPMARK;
1910
1911 PUTBACK;
1912 }
1913
1914 /* now that we have a slf_frame, interpret it! */
1915 /* we use a callback system not to make the code needlessly */
1916 /* complicated, but so we can run multiple perl coros from one cctx */
1917
1918 do
1919 {
1920 struct coro_transfer_args ta;
1921
1922 slf_frame.prepare (aTHX_ &ta);
1923 TRANSFER (ta, 0);
1924
1925 checkmark = PL_stack_sp - PL_stack_base;
1926 }
1927 while (slf_frame.check (aTHX_ &slf_frame));
1928
1929 {
1930 dSP;
1931 SV **bot = PL_stack_base + checkmark;
1932 int gimme = GIMME_V;
1933
1934 slf_frame.prepare = 0; /* invalidate the frame, so it gets initialised again next time */
1935
1936 /* make sure we put something on the stack in scalar context */
1937 if (gimme == G_SCALAR)
1938 {
1939 if (sp == bot)
1940 XPUSHs (&PL_sv_undef);
1941
1942 SP = bot + 1;
1898 } 1943 }
1899 1944
1900 PUTBACK; 1945 PUTBACK;
1901 switch (PL_op->op_private & OPpENTERSUB_SLF) 1946 }
1947
1948 {
1949 struct coro *coro = SvSTATE_current;
1950
1951 if (expect_false (coro->throw))
1902 { 1952 {
1903 case 0: 1953 SV *exception = sv_2mortal (coro->throw);
1904 prepare_set_stacklevel (&ta, (struct coro_cctx *)SvIV (arg [0])); 1954
1955 coro->throw = 0;
1956 sv_setsv (ERRSV, exception);
1905 break; 1957 croak (0);
1906
1907 case 1:
1908 if (items != 2)
1909 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d.", items);
1910
1911 prepare_transfer (aTHX_ &ta, arg [0], arg [1]);
1912 break;
1913
1914 case 2:
1915 prepare_schedule (aTHX_ &ta);
1916 break;
1917
1918 case 3:
1919 prepare_cede (aTHX_ &ta);
1920 break;
1921
1922 case 4:
1923 prepare_cede_notself (aTHX_ &ta);
1924 break;
1925
1926 case 5:
1927 abort ();
1928
1929 default:
1930 abort ();
1931 } 1958 }
1959 }
1932 1960
1933 TRANSFER (ta, 0); 1961 return NORMAL;
1934 SPAGAIN;
1935
1936 PUTBACK;
1937 SLF_TAIL;
1938 SPAGAIN;
1939 RETURN;
1940} 1962}
1941 1963
1942static void 1964static void
1943coro_slf_patch (pTHX_ CV *cv, int ix, SV **args, int items) 1965api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, SV **arg, int items)
1944{ 1966{
1945 assert (("FATAL: SLF call recursion in Coro module (please report)", PL_op->op_ppaddr != pp_slf));
1946
1947 assert (("FATAL: SLF call with illegal CV value", CvGV (cv))); 1967 assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
1968
1969 if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
1970 && PL_op->op_ppaddr != pp_slf)
1971 croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
1972
1973 if (items > 3)
1974 croak ("Coro only supports up to three arguments to SLF functions currently (not %d), caught", items);
1975
1976 CvFLAGS (cv) |= CVf_SLF;
1977 CvXSUBANY (cv).any_ptr = (void *)init_cb;
1948 slf_cv = cv; 1978 slf_cv = cv;
1949 1979
1950 /* we patch the op, and then re-run the whole call */ 1980 /* we patch the op, and then re-run the whole call */
1951 /* we have to put the same argument on the stack for this to work */ 1981 /* we have to put the same argument on the stack for this to work */
1952 /* and this will be done by pp_restore */ 1982 /* and this will be done by pp_restore */
1953 slf_restore.op_next = (OP *)&slf_restore; 1983 slf_restore.op_next = (OP *)&slf_restore;
1954 slf_restore.op_type = OP_NULL; 1984 slf_restore.op_type = OP_CUSTOM;
1955 slf_restore.op_ppaddr = pp_restore; 1985 slf_restore.op_ppaddr = pp_restore;
1956 slf_restore.op_first = PL_op; 1986 slf_restore.op_first = PL_op;
1957 1987
1958 slf_arg0 = items > 0 ? SvREFCNT_inc (args [0]) : 0; 1988 slf_arg0 = items > 0 ? SvREFCNT_inc (arg [0]) : 0;
1959 slf_arg1 = items > 1 ? SvREFCNT_inc (args [1]) : 0; 1989 slf_arg1 = items > 1 ? SvREFCNT_inc (arg [1]) : 0;
1990 slf_arg2 = items > 2 ? SvREFCNT_inc (arg [2]) : 0;
1960 1991
1961 PL_op->op_ppaddr = pp_slf; 1992 PL_op->op_ppaddr = pp_slf;
1962 PL_op->op_private = PL_op->op_private & ~OPpENTERSUB_SLF | ix; /* we potentially share our private flags with entersub */
1963 1993
1964 PL_op = (OP *)&slf_restore; 1994 PL_op = (OP *)&slf_restore;
1965} 1995}
1966 1996
1997/*****************************************************************************/
1998
1999static void
2000coro_semaphore_adjust (pTHX_ AV *av, IV adjust)
2001{
2002 SV *count_sv = AvARRAY (av)[0];
2003 IV count = SvIVX (count_sv);
2004
2005 count += adjust;
2006 SvIVX (count_sv) = count;
2007
2008 /* now wake up as many waiters as are expected to lock */
2009 while (count > 0 && AvFILLp (av) > 0)
2010 {
2011 SV *cb;
2012
2013 /* swap first two elements so we can shift a waiter */
2014 AvARRAY (av)[0] = AvARRAY (av)[1];
2015 AvARRAY (av)[1] = count_sv;
2016 cb = av_shift (av);
2017
2018 if (SvOBJECT (cb))
2019 api_ready (aTHX_ cb);
2020 else
2021 croak ("callbacks not yet supported");
2022
2023 SvREFCNT_dec (cb);
2024
2025 --count;
2026 }
2027}
2028
2029static void
2030coro_semaphore_on_destroy (pTHX_ struct coro *coro)
2031{
2032 /* call $sem->adjust (0) to possibly wake up some other waiters */
2033 coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
2034}
2035
2036static int
2037slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
2038{
2039 AV *av = (AV *)frame->data;
2040 SV *count_sv = AvARRAY (av)[0];
2041
2042 if (SvIVX (count_sv) > 0)
2043 {
2044 SvSTATE_current->on_destroy = 0;
2045 SvIVX (count_sv) = SvIVX (count_sv) - 1;
2046 return 0;
2047 }
2048 else
2049 {
2050 int i;
2051 /* if we were woken up but can't down, we look through the whole */
2052 /* waiters list and only add us if we aren't in there already */
2053 /* this avoids some degenerate memory usage cases */
2054
2055 for (i = 1; i <= AvFILLp (av); ++i)
2056 if (AvARRAY (av)[i] == SvRV (coro_current))
2057 return 1;
2058
2059 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2060 return 1;
2061 }
2062}
2063
2064static void
2065slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2066{
2067 AV *av = (AV *)SvRV (arg [0]);
2068
2069 if (SvIVX (AvARRAY (av)[0]) > 0)
2070 {
2071 frame->data = (void *)av;
2072 frame->prepare = prepare_nop;
2073 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2074 }
2075 else
2076 {
2077 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2078
2079 frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
2080 frame->prepare = prepare_schedule;
2081
2082 /* to avoid race conditions when a woken-up coro gets terminated */
2083 /* we arrange for a temporary on_destroy that calls adjust (0) */
2084 assert (!SvSTATE_current->on_destroy);//D
2085 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2086 }
2087
2088 frame->check = slf_check_semaphore_down;
2089
2090}
2091
2092/*****************************************************************************/
2093
2094#define GENSUB_ARG CvXSUBANY (cv).any_ptr
2095
2096/* create a closure from XS, returns a code reference */
2097/* the arg can be accessed via GENSUB_ARG from the callback */
2098/* the callback must use dXSARGS/XSRETURN */
2099static SV *
2100gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
2101{
2102 CV *cv = (CV *)NEWSV (0, 0);
2103
2104 sv_upgrade ((SV *)cv, SVt_PVCV);
2105
2106 CvANON_on (cv);
2107 CvISXSUB_on (cv);
2108 CvXSUB (cv) = xsub;
2109 GENSUB_ARG = arg;
2110
2111 return newRV_noinc ((SV *)cv);
2112}
2113
2114/*****************************************************************************/
2115
1967MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_ 2116MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1968 2117
1969PROTOTYPES: DISABLE 2118PROTOTYPES: DISABLE
1970 2119
1971BOOT: 2120BOOT:
1972{ 2121{
1973#ifdef USE_ITHREADS 2122#ifdef USE_ITHREADS
1974 MUTEX_INIT (&coro_lock);
1975# if CORO_PTHREAD 2123# if CORO_PTHREAD
1976 coro_thx = PERL_GET_CONTEXT; 2124 coro_thx = PERL_GET_CONTEXT;
1977# endif 2125# endif
1978#endif 2126#endif
1979 BOOT_PAGESIZE; 2127 BOOT_PAGESIZE;
… …
2000 main_top_env = PL_top_env; 2148 main_top_env = PL_top_env;
2001 2149
2002 while (main_top_env->je_prev) 2150 while (main_top_env->je_prev)
2003 main_top_env = main_top_env->je_prev; 2151 main_top_env = main_top_env->je_prev;
2004 2152
2153 {
2154 SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
2155
2156 if (!PL_custom_op_names) PL_custom_op_names = newHV ();
2157 hv_store_ent (PL_custom_op_names, slf,
2158 newSVpv ("coro_slf", 0), 0);
2159
2160 if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
2161 hv_store_ent (PL_custom_op_descs, slf,
2162 newSVpv ("coro schedule like function", 0), 0);
2163 }
2164
2005 coroapi.ver = CORO_API_VERSION; 2165 coroapi.ver = CORO_API_VERSION;
2006 coroapi.rev = CORO_API_REVISION; 2166 coroapi.rev = CORO_API_REVISION;
2167
2007 coroapi.transfer = api_transfer; 2168 coroapi.transfer = api_transfer;
2169
2170 coroapi.sv_state = SvSTATE_;
2171 coroapi.execute_slf = api_execute_slf;
2172 coroapi.prepare_nop = prepare_nop;
2173 coroapi.prepare_schedule = prepare_schedule;
2174 coroapi.prepare_cede = prepare_cede;
2175 coroapi.prepare_cede_notself = prepare_cede_notself;
2008 2176
2009 { 2177 {
2010 SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0); 2178 SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2011 2179
2012 if (!svp) croak ("Time::HiRes is required"); 2180 if (!svp) croak ("Time::HiRes is required");
… …
2047 OUTPUT: 2215 OUTPUT:
2048 RETVAL 2216 RETVAL
2049 2217
2050void 2218void
2051_set_stacklevel (...) 2219_set_stacklevel (...)
2052 ALIAS: 2220 CODE:
2053 Coro::State::transfer = 1 2221 api_execute_slf (aTHX_ cv, slf_init_set_stacklevel, &ST (0), items);
2054 Coro::schedule = 2 2222
2055 Coro::cede = 3 2223void
2056 Coro::cede_notself = 4 2224transfer (...)
2057 CODE: 2225 PROTOTYPE: $$
2058 coro_slf_patch (aTHX_ cv, ix, &ST (0), items); 2226 CODE:
2227 api_execute_slf (aTHX_ cv, slf_init_transfer, &ST (0), items);
2059 2228
2060bool 2229bool
2061_destroy (SV *coro_sv) 2230_destroy (SV *coro_sv)
2062 CODE: 2231 CODE:
2063 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv)); 2232 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
… …
2070 CODE: 2239 CODE:
2071 _exit (code); 2240 _exit (code);
2072 2241
2073int 2242int
2074cctx_stacksize (int new_stacksize = 0) 2243cctx_stacksize (int new_stacksize = 0)
2244 PROTOTYPE: ;$
2075 CODE: 2245 CODE:
2076 RETVAL = cctx_stacksize; 2246 RETVAL = cctx_stacksize;
2077 if (new_stacksize) 2247 if (new_stacksize)
2078 { 2248 {
2079 cctx_stacksize = new_stacksize; 2249 cctx_stacksize = new_stacksize;
… …
2082 OUTPUT: 2252 OUTPUT:
2083 RETVAL 2253 RETVAL
2084 2254
2085int 2255int
2086cctx_max_idle (int max_idle = 0) 2256cctx_max_idle (int max_idle = 0)
2257 PROTOTYPE: ;$
2087 CODE: 2258 CODE:
2088 RETVAL = cctx_max_idle; 2259 RETVAL = cctx_max_idle;
2089 if (max_idle > 1) 2260 if (max_idle > 1)
2090 cctx_max_idle = max_idle; 2261 cctx_max_idle = max_idle;
2091 OUTPUT: 2262 OUTPUT:
2092 RETVAL 2263 RETVAL
2093 2264
2094int 2265int
2095cctx_count () 2266cctx_count ()
2267 PROTOTYPE:
2096 CODE: 2268 CODE:
2097 RETVAL = cctx_count; 2269 RETVAL = cctx_count;
2098 OUTPUT: 2270 OUTPUT:
2099 RETVAL 2271 RETVAL
2100 2272
2101int 2273int
2102cctx_idle () 2274cctx_idle ()
2275 PROTOTYPE:
2103 CODE: 2276 CODE:
2104 RETVAL = cctx_idle; 2277 RETVAL = cctx_idle;
2105 OUTPUT: 2278 OUTPUT:
2106 RETVAL 2279 RETVAL
2107 2280
2108void 2281void
2109list () 2282list ()
2283 PROTOTYPE:
2110 PPCODE: 2284 PPCODE:
2111{ 2285{
2112 struct coro *coro; 2286 struct coro *coro;
2113 for (coro = coro_first; coro; coro = coro->next) 2287 for (coro = coro_first; coro; coro = coro->next)
2114 if (coro->hv) 2288 if (coro->hv)
… …
2181 SvREFCNT_dec (self->throw); 2355 SvREFCNT_dec (self->throw);
2182 self->throw = SvOK (throw) ? newSVsv (throw) : 0; 2356 self->throw = SvOK (throw) ? newSVsv (throw) : 0;
2183 2357
2184void 2358void
2185api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB) 2359api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
2360 PROTOTYPE: $;$
2361 C_ARGS: aTHX_ coro, flags
2186 2362
2187SV * 2363SV *
2188has_cctx (Coro::State coro) 2364has_cctx (Coro::State coro)
2189 PROTOTYPE: $ 2365 PROTOTYPE: $
2190 CODE: 2366 CODE:
… …
2214 OUTPUT: 2390 OUTPUT:
2215 RETVAL 2391 RETVAL
2216 2392
2217void 2393void
2218force_cctx () 2394force_cctx ()
2395 PROTOTYPE:
2219 CODE: 2396 CODE:
2220 struct coro *coro = SvSTATE (coro_current);
2221 coro->cctx->idle_sp = 0; 2397 SvSTATE_current->cctx->idle_sp = 0;
2222 2398
2223void 2399void
2224swap_defsv (Coro::State self) 2400swap_defsv (Coro::State self)
2225 PROTOTYPE: $ 2401 PROTOTYPE: $
2226 ALIAS: 2402 ALIAS:
2227 swap_defav = 1 2403 swap_defav = 1
2228 CODE: 2404 CODE:
2229 if (!self->slot) 2405 if (!self->slot)
2230 croak ("cannot swap state with coroutine that has no saved state"); 2406 croak ("cannot swap state with coroutine that has no saved state,");
2231 else 2407 else
2232 { 2408 {
2233 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv); 2409 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2234 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv; 2410 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
2235 2411
… …
2267 coroapi.schedule = api_schedule; 2443 coroapi.schedule = api_schedule;
2268 coroapi.cede = api_cede; 2444 coroapi.cede = api_cede;
2269 coroapi.cede_notself = api_cede_notself; 2445 coroapi.cede_notself = api_cede_notself;
2270 coroapi.ready = api_ready; 2446 coroapi.ready = api_ready;
2271 coroapi.is_ready = api_is_ready; 2447 coroapi.is_ready = api_is_ready;
2272 coroapi.nready = &coro_nready; 2448 coroapi.nready = coro_nready;
2273 coroapi.current = coro_current; 2449 coroapi.current = coro_current;
2274 2450
2275 GCoroAPI = &coroapi; 2451 GCoroAPI = &coroapi;
2276 sv_setiv (sv, (IV)&coroapi); 2452 sv_setiv (sv, (IV)&coroapi);
2277 SvREADONLY_on (sv); 2453 SvREADONLY_on (sv);
2278 } 2454 }
2279} 2455}
2456
2457void
2458schedule (...)
2459 CODE:
2460 api_execute_slf (aTHX_ cv, slf_init_schedule, &ST (0), 0);
2461
2462void
2463cede (...)
2464 CODE:
2465 api_execute_slf (aTHX_ cv, slf_init_cede, &ST (0), 0);
2466
2467void
2468cede_notself (...)
2469 CODE:
2470 api_execute_slf (aTHX_ cv, slf_init_cede_notself, &ST (0), 0);
2280 2471
2281void 2472void
2282_set_current (SV *current) 2473_set_current (SV *current)
2283 PROTOTYPE: $ 2474 PROTOTYPE: $
2284 CODE: 2475 CODE:
… …
2287 2478
2288void 2479void
2289_set_readyhook (SV *hook) 2480_set_readyhook (SV *hook)
2290 PROTOTYPE: $ 2481 PROTOTYPE: $
2291 CODE: 2482 CODE:
2292 LOCK;
2293 SvREFCNT_dec (coro_readyhook); 2483 SvREFCNT_dec (coro_readyhook);
2294 coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0; 2484 coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2295 UNLOCK;
2296 2485
2297int 2486int
2298prio (Coro::State coro, int newprio = 0) 2487prio (Coro::State coro, int newprio = 0)
2488 PROTOTYPE: $;$
2299 ALIAS: 2489 ALIAS:
2300 nice = 1 2490 nice = 1
2301 CODE: 2491 CODE:
2302{ 2492{
2303 RETVAL = coro->prio; 2493 RETVAL = coro->prio;
… …
2318 2508
2319SV * 2509SV *
2320ready (SV *self) 2510ready (SV *self)
2321 PROTOTYPE: $ 2511 PROTOTYPE: $
2322 CODE: 2512 CODE:
2323 RETVAL = boolSV (api_ready (self)); 2513 RETVAL = boolSV (api_ready (aTHX_ self));
2324 OUTPUT: 2514 OUTPUT:
2325 RETVAL 2515 RETVAL
2326 2516
2327int 2517int
2328nready (...) 2518nready (...)
… …
2335# for async_pool speedup 2525# for async_pool speedup
2336void 2526void
2337_pool_1 (SV *cb) 2527_pool_1 (SV *cb)
2338 CODE: 2528 CODE:
2339{ 2529{
2340 struct coro *coro = SvSTATE (coro_current);
2341 HV *hv = (HV *)SvRV (coro_current); 2530 HV *hv = (HV *)SvRV (coro_current);
2531 struct coro *coro = SvSTATE_hv ((SV *)hv);
2342 AV *defav = GvAV (PL_defgv); 2532 AV *defav = GvAV (PL_defgv);
2343 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0); 2533 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2344 AV *invoke_av; 2534 AV *invoke_av;
2345 int i, len; 2535 int i, len;
2346 2536
… …
2367 { 2557 {
2368 av_fill (defav, len - 1); 2558 av_fill (defav, len - 1);
2369 for (i = 0; i < len; ++i) 2559 for (i = 0; i < len; ++i)
2370 av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1])); 2560 av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2371 } 2561 }
2372
2373 SvREFCNT_dec (invoke);
2374} 2562}
2375 2563
2376void 2564void
2377_pool_2 (SV *cb) 2565_pool_2 (SV *cb)
2378 CODE: 2566 CODE:
2379{ 2567{
2380 struct coro *coro = SvSTATE (coro_current); 2568 struct coro *coro = SvSTATE_current;
2381 2569
2382 sv_setsv (cb, &PL_sv_undef); 2570 sv_setsv (cb, &PL_sv_undef);
2383 2571
2384 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh; 2572 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2385 coro->saved_deffh = 0; 2573 coro->saved_deffh = 0;
… …
2398 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0); 2586 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2399 2587
2400 coro->prio = 0; 2588 coro->prio = 0;
2401 2589
2402 if (coro->cctx && (coro->cctx->flags & CC_TRACE)) 2590 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2403 api_trace (coro_current, 0); 2591 api_trace (aTHX_ coro_current, 0);
2404 2592
2405 av_push (av_async_pool, newSVsv (coro_current)); 2593 av_push (av_async_pool, newSVsv (coro_current));
2406} 2594}
2407
2408#if 0
2409
2410void
2411_generator_call (...)
2412 PROTOTYPE: @
2413 PPCODE:
2414 fprintf (stderr, "call %p\n", CvXSUBANY(cv).any_ptr);
2415 xxxx
2416 abort ();
2417
2418SV *
2419gensub (SV *sub, ...)
2420 PROTOTYPE: &;@
2421 CODE:
2422{
2423 struct coro *coro;
2424 MAGIC *mg;
2425 CV *xcv;
2426 CV *ncv = (CV *)newSV_type (SVt_PVCV);
2427 int i;
2428
2429 CvGV (ncv) = CvGV (cv);
2430 CvFILE (ncv) = CvFILE (cv);
2431
2432 Newz (0, coro, 1, struct coro);
2433 coro->args = newAV ();
2434 coro->flags = CF_NEW;
2435
2436 av_extend (coro->args, items - 1);
2437 for (i = 1; i < items; i++)
2438 av_push (coro->args, newSVsv (ST (i)));
2439
2440 CvISXSUB_on (ncv);
2441 CvXSUBANY (ncv).any_ptr = (void *)coro;
2442
2443 xcv = GvCV (gv_fetchpv ("Coro::_generator_call", 0, SVt_PVCV));
2444
2445 CvXSUB (ncv) = CvXSUB (xcv);
2446 CvANON_on (ncv);
2447
2448 mg = sv_magicext ((SV *)ncv, 0, CORO_MAGIC_type_state, &coro_gensub_vtbl, (char *)coro, 0);
2449 RETVAL = newRV_noinc ((SV *)ncv);
2450}
2451 OUTPUT:
2452 RETVAL
2453
2454#endif
2455 2595
2456 2596
2457MODULE = Coro::State PACKAGE = Coro::AIO 2597MODULE = Coro::State PACKAGE = Coro::AIO
2458 2598
2459void 2599void
2460_get_state (SV *self) 2600_get_state (SV *self)
2601 PROTOTYPE: $
2461 PPCODE: 2602 PPCODE:
2462{ 2603{
2463 AV *defav = GvAV (PL_defgv); 2604 AV *defav = GvAV (PL_defgv);
2464 AV *av = newAV (); 2605 AV *av = newAV ();
2465 int i; 2606 int i;
… …
2480 2621
2481 av_push (av, data_sv); 2622 av_push (av, data_sv);
2482 2623
2483 XPUSHs (sv_2mortal (newRV_noinc ((SV *)av))); 2624 XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
2484 2625
2485 api_ready (self); 2626 api_ready (aTHX_ self);
2486} 2627}
2487 2628
2488void 2629void
2489_set_state (SV *state) 2630_set_state (SV *state)
2490 PROTOTYPE: $ 2631 PROTOTYPE: $
… …
2508MODULE = Coro::State PACKAGE = Coro::AnyEvent 2649MODULE = Coro::State PACKAGE = Coro::AnyEvent
2509 2650
2510BOOT: 2651BOOT:
2511 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE); 2652 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2512 2653
2513SV * 2654void
2514_schedule (...) 2655_schedule (...)
2515 PROTOTYPE: @
2516 CODE: 2656 CODE:
2517{ 2657{
2518 static int incede; 2658 static int incede;
2519 2659
2520 api_cede_notself (); 2660 api_cede_notself (aTHX);
2521 2661
2522 ++incede; 2662 ++incede;
2523 while (coro_nready >= incede && api_cede ()) 2663 while (coro_nready >= incede && api_cede (aTHX))
2524 ; 2664 ;
2525 2665
2526 sv_setsv (sv_activity, &PL_sv_undef); 2666 sv_setsv (sv_activity, &PL_sv_undef);
2527 if (coro_nready >= incede) 2667 if (coro_nready >= incede)
2528 { 2668 {
… …
2539MODULE = Coro::State PACKAGE = PerlIO::cede 2679MODULE = Coro::State PACKAGE = PerlIO::cede
2540 2680
2541BOOT: 2681BOOT:
2542 PerlIO_define_layer (aTHX_ &PerlIO_cede); 2682 PerlIO_define_layer (aTHX_ &PerlIO_cede);
2543 2683
2684MODULE = Coro::State PACKAGE = Coro::Semaphore
2685
2686SV *
2687new (SV *klass, SV *count_ = 0)
2688 CODE:
2689{
2690 /* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
2691 AV *av = newAV ();
2692 av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
2693 RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
2694}
2695 OUTPUT:
2696 RETVAL
2697
2698SV *
2699count (SV *self)
2700 CODE:
2701 RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
2702 OUTPUT:
2703 RETVAL
2704
2705void
2706up (SV *self, int adjust = 1)
2707 ALIAS:
2708 adjust = 1
2709 CODE:
2710 coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
2711
2712void
2713down (SV *self)
2714 CODE:
2715 api_execute_slf (aTHX_ cv, slf_init_semaphore_down, &ST (0), 1);
2716
2717void
2718try (SV *self)
2719 PPCODE:
2720{
2721 AV *av = (AV *)SvRV (self);
2722 SV *count_sv = AvARRAY (av)[0];
2723 IV count = SvIVX (count_sv);
2724
2725 if (count > 0)
2726 {
2727 --count;
2728 SvIVX (count_sv) = count;
2729 XSRETURN_YES;
2730 }
2731 else
2732 XSRETURN_NO;
2733}
2734
2735void
2736waiters (SV *self)
2737 CODE:
2738{
2739 AV *av = (AV *)SvRV (self);
2740
2741 if (GIMME_V == G_SCALAR)
2742 XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
2743 else
2744 {
2745 int i;
2746 EXTEND (SP, AvFILLp (av) + 1 - 1);
2747 for (i = 1; i <= AvFILLp (av); ++i)
2748 PUSHs (newSVsv (AvARRAY (av)[i]));
2749 }
2750}
2751

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