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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.270 by root, Fri Nov 14 07:22:11 2008 UTC vs.
Revision 1.286 by root, Mon Nov 17 04:19:49 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
148	static 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
152	static void *coro_thx;	148	static 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 */
168	struct io_state	153	struct io_state
169	{	154	{
170	AV *res;	155	AV *res;
…		…
181	static struct CoroAPI coroapi;	166	static struct CoroAPI coroapi;
182	static AV *main_mainstack; /* used to differentiate between $main and others */	167	static AV *main_mainstack; /* used to differentiate between $main and others */
183	static JMPENV *main_top_env;	168	static JMPENV *main_top_env;
184	static HV *coro_state_stash, *coro_stash;	169	static HV *coro_state_stash, *coro_stash;
185	static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */	170	static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
186	static volatile struct coro *transfer_next;
187
188	struct transfer_args
189	{
190	struct coro *prev, *next;
191	};
192		171
193	static GV *irsgv; /* $/ */	172	static GV *irsgv; /* $/ */
194	static GV *stdoutgv; /* *STDOUT */	173	static GV *stdoutgv; /* *STDOUT */
195	static SV *rv_diehook;	174	static SV *rv_diehook;
196	static SV *rv_warnhook;	175	static 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 */
220	typedef struct coro_cctx {	199	typedef 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 */
248	typedef struct {	228	typedef 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 */
261	struct coro {	242	struct 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	/* state 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
288	typedef struct coro *Coro__State;	271	typedef struct coro *Coro__State;
289	typedef struct coro *Coro__State_or_hashref;	272	typedef struct coro *Coro__State_or_hashref;
		273
		274	/* the following variables are effectively part of the perl context */
		275	/* and get copied between struct coro and these variables */
		276	/* the mainr easonw e don't support windows process emulation */
		277	static struct CoroSLF slf_frame; /* the current slf frame */
		278	static SV *coro_throw;
290		279
291	/** Coro ********************************************************************/	280	/** Coro ********************************************************************/
292		281
293	#define PRIO_MAX 3	282	#define PRIO_MAX 3
294	#define PRIO_HIGH 1	283	#define PRIO_HIGH 1
…		…
403	static MGVTBL coro_cv_vtbl = {	392	static MGVTBL coro_cv_vtbl = {
404	0, 0, 0, 0,	393	0, 0, 0, 0,
405	coro_cv_free	394	coro_cv_free
406	};	395	};
407		396
408	#define CORO_MAGIC(sv, type) \	397	#define CORO_MAGIC(sv, type) \
409	SvMAGIC (sv) \	398	expect_true (SvMAGIC (sv)) \
410	? SvMAGIC (sv)->mg_type == type \	399	? expect_true (SvMAGIC (sv)->mg_type == type) \
411	? SvMAGIC (sv) \	400	? SvMAGIC (sv) \
412	: mg_find (sv, type) \	401	: mg_find (sv, type) \
413	: 0	402	: 0
414		403
415	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)	404	#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)	405	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
417		406
…		…
438	mg = CORO_MAGIC_state (coro);	427	mg = CORO_MAGIC_state (coro);
439	return (struct coro *)mg->mg_ptr;	428	return (struct coro *)mg->mg_ptr;
440	}	429	}
441		430
442	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))	431	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		432
		433	/* fastert than SvSTATE, but expects a coroutine hv */
		434	INLINE struct coro *
		435	SvSTATE_hv (SV *sv)
		436	{
		437	MAGIC *mg = expect_true (SvMAGIC (sv)->mg_type == CORO_MAGIC_type_state)
		438	? SvMAGIC (sv)
		439	: mg_find (sv, CORO_MAGIC_type_state);
		440
		441	return (struct coro *)mg->mg_ptr;
		442	}
		443
		444	#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
443		445
444	/* the next two functions merely cache the padlists */	446	/* the next two functions merely cache the padlists */
445	static void	447	static void
446	get_padlist (pTHX_ CV *cv)	448	get_padlist (pTHX_ CV *cv)
447	{	449	{
…		…
514	CvPADLIST (cv) = (AV *)POPs;	516	CvPADLIST (cv) = (AV *)POPs;
515	}	517	}
516		518
517	PUTBACK;	519	PUTBACK;
518	}	520	}
		521
		522	slf_frame = c->slf_frame;
		523	coro_throw = c->throw;
519	}	524	}
520		525
521	static void	526	static void
522	save_perl (pTHX_ Coro__State c)	527	save_perl (pTHX_ Coro__State c)
523	{	528	{
		529	c->throw = coro_throw;
		530	c->slf_frame = slf_frame;
		531
524	{	532	{
525	dSP;	533	dSP;
526	I32 cxix = cxstack_ix;	534	I32 cxix = cxstack_ix;
527	PERL_CONTEXT *ccstk = cxstack;	535	PERL_CONTEXT *ccstk = cxstack;
528	PERL_SI *top_si = PL_curstackinfo;	536	PERL_SI *top_si = PL_curstackinfo;
…		…
595	#undef VAR	603	#undef VAR
596	}	604	}
597	}	605	}
598		606
599	/*	607	/*
600	* allocate various perl stacks. This is an exact copy	608	* allocate various perl stacks. This is almost an exact copy
601	* of perl.c:init_stacks, except that it uses less memory	609	* of perl.c:init_stacks, except that it uses less memory
602	* on the (sometimes correct) assumption that coroutines do	610	* on the (sometimes correct) assumption that coroutines do
603	* not usually need a lot of stackspace.	611	* not usually need a lot of stackspace.
604	*/	612	*/
605	#if CORO_PREFER_PERL_FUNCTIONS	613	#if CORO_PREFER_PERL_FUNCTIONS
…		…
712	#endif	720	#endif
713	}	721	}
714	}	722	}
715		723
716	return rss;	724	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
726	INLINE void
727	slf_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	}	725	}
745		726
746	/** coroutine stack handling ************************************************/	727	/** coroutine stack handling ************************************************/
747		728
748	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);	729	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
…		…
834		815
835	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;	816	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
836	}	817	}
837		818
838	static void	819	static void
		820	prepare_nop (pTHX_ struct coro_transfer_args *ta)
		821	{
		822	/* kind of mega-hacky, but works */
		823	ta->next = ta->prev = (struct coro *)ta;
		824	}
		825
		826	static int
		827	slf_check_nop (pTHX_ struct CoroSLF *frame)
		828	{
		829	return 0;
		830	}
		831
		832	static void NOINLINE /* noinline to keep it out of the transfer fast path */
839	coro_setup (pTHX_ struct coro *coro)	833	coro_setup (pTHX_ struct coro *coro)
840	{	834	{
841	/*	835	/*
842	* emulate part of the perl startup here.	836	* emulate part of the perl startup here.
843	*/	837	*/
…		…
882	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	876	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
883	SPAGAIN;	877	SPAGAIN;
884	}	878	}
885		879
886	/* this newly created coroutine might be run on an existing cctx which most	880	/* 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,	881	* 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	*/	882	*/
890	SLF_HEAD;	883	slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
		884	slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
		885
		886	coro_throw = coro->throw;
891	}	887	}
892		888
893	static void	889	static void
894	coro_destruct (pTHX_ struct coro *coro)	890	coro_destruct (pTHX_ struct coro *coro)
895	{	891	{
…		…
919		915
920	SvREFCNT_dec (PL_diehook);	916	SvREFCNT_dec (PL_diehook);
921	SvREFCNT_dec (PL_warnhook);	917	SvREFCNT_dec (PL_warnhook);
922		918
923	SvREFCNT_dec (coro->saved_deffh);	919	SvREFCNT_dec (coro->saved_deffh);
924	SvREFCNT_dec (coro->throw);	920	SvREFCNT_dec (coro_throw);
925		921
926	coro_destruct_stacks (aTHX);	922	coro_destruct_stacks (aTHX);
927	}	923	}
928		924
929	INLINE void	925	INLINE void
…		…
939	static int	935	static int
940	runops_trace (pTHX)	936	runops_trace (pTHX)
941	{	937	{
942	COP *oldcop = 0;	938	COP *oldcop = 0;
943	int oldcxix = -2;	939	int oldcxix = -2;
944	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */	940	struct coro *coro = SvSTATE_current; /* trace cctx is tied to specific coro */
945	coro_cctx *cctx = coro->cctx;	941	coro_cctx *cctx = coro->cctx;
946		942
947	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))	943	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
948	{	944	{
949	PERL_ASYNC_CHECK ();	945	PERL_ASYNC_CHECK ();
…		…
1059	TAINT_NOT;	1055	TAINT_NOT;
1060	return 0;	1056	return 0;
1061	}	1057	}
1062		1058
1063	static void	1059	static void
1064	prepare_set_stacklevel (struct transfer_args *ta, struct coro_cctx *cctx)	1060	prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1065	{	1061	{
1066	ta->prev = (struct coro *)cctx;	1062	ta->prev = (struct coro *)cctx;
1067	ta->next = 0;	1063	ta->next = 0;
1068	}	1064	}
1069		1065
…		…
1098		1094
1099	/* the tail of transfer: execute stuff we can only do after a transfer */	1095	/* the tail of transfer: execute stuff we can only do after a transfer */
1100	INLINE void	1096	INLINE void
1101	transfer_tail (pTHX)	1097	transfer_tail (pTHX)
1102	{	1098	{
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);	1099	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	}	1100	}
1119		1101
1120	/*	1102	/*
1121	* this is a _very_ stripped down perl interpreter ;)	1103	* this is a _very_ stripped down perl interpreter ;)
1122	*/	1104	*/
…		…
1129	# endif	1111	# endif
1130	#endif	1112	#endif
1131	{	1113	{
1132	dTHX;	1114	dTHX;
1133		1115
1134	/* we are the alternative tail to pp_set_stacklevel */	1116	/* normally we would need to skip the entersub here */
1135	/* so do the same things here */	1117	/* 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;	1118	/* PL_nop = PL_nop->op_next */
1140		1119
1141	/* inject a fake subroutine call to cctx_init */	1120	/* inject a fake subroutine call to cctx_init */
1142	cctx_prepare (aTHX_ (coro_cctx *)arg);	1121	cctx_prepare (aTHX_ (coro_cctx *)arg);
1143		1122
1144	/* cctx_run is the alternative tail of transfer() */	1123	/* cctx_run is the alternative tail of transfer() */
…		…
1305	/** coroutine switching *****************************************************/	1284	/** coroutine switching *****************************************************/
1306		1285
1307	static void	1286	static void
1308	transfer_check (pTHX_ struct coro *prev, struct coro *next)	1287	transfer_check (pTHX_ struct coro *prev, struct coro *next)
1309	{	1288	{
		1289	/* TODO: throwing up here is considered harmful */
		1290
1310	if (expect_true (prev != next))	1291	if (expect_true (prev != next))
1311	{	1292	{
1312	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))	1293	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");	1294	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1314		1295
1315	if (expect_false (next->flags & CF_RUNNING))	1296	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");	1297	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1317		1298
1318	if (expect_false (next->flags & CF_DESTROYED))	1299	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");	1300	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1320		1301
1321	#if !PERL_VERSION_ATLEAST (5,10,0)	1302	#if !PERL_VERSION_ATLEAST (5,10,0)
1322	if (expect_false (PL_lex_state != LEX_NOTPARSING))	1303	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");	1304	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1324	#endif	1305	#endif
1325	}	1306	}
1326	}	1307	}
1327		1308
1328	/* always use the TRANSFER macro */	1309	/* always use the TRANSFER macro */
1329	static void NOINLINE	1310	static void NOINLINE /* noinline so we have a fixed stackframe */
1330	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)	1311	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1331	{	1312	{
1332	dSTACKLEVEL;	1313	dSTACKLEVEL;
1333		1314
1334	/* sometimes transfer is only called to set idle_sp */	1315	/* sometimes transfer is only called to set idle_sp */
1335	if (expect_false (!next))	1316	if (expect_false (!next))
1336	{	1317	{
1337	((coro_cctx *)prev)->idle_sp = stacklevel;	1318	((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 */	1319	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1339	}	1320	}
1340	else if (expect_true (prev != next))	1321	else if (expect_true (prev != next))
1341	{	1322	{
1342	coro_cctx *prev__cctx;	1323	coro_cctx *prev__cctx;
…		…
1349	prev->flags |= CF_RUNNING;	1330	prev->flags |= CF_RUNNING;
1350	}	1331	}
1351		1332
1352	prev->flags &= ~CF_RUNNING;	1333	prev->flags &= ~CF_RUNNING;
1353	next->flags |= CF_RUNNING;	1334	next->flags |= CF_RUNNING;
1354
1355	LOCK;
1356		1335
1357	/* first get rid of the old state */	1336	/* first get rid of the old state */
1358	save_perl (aTHX_ prev);	1337	save_perl (aTHX_ prev);
1359		1338
1360	if (expect_false (next->flags & CF_NEW))	1339	if (expect_false (next->flags & CF_NEW))
…		…
1369		1348
1370	prev__cctx = prev->cctx;	1349	prev__cctx = prev->cctx;
1371		1350
1372	/* possibly untie and reuse the cctx */	1351	/* possibly untie and reuse the cctx */
1373	if (expect_true (	1352	if (expect_true (
1374	prev__cctx->idle_sp == stacklevel	1353	prev__cctx->idle_sp == (void *)stacklevel
1375	&& !(prev__cctx->flags & CC_TRACE)	1354	&& !(prev__cctx->flags & CC_TRACE)
1376	&& !force_cctx	1355	&& !force_cctx
1377	))	1356	))
1378	{	1357	{
1379	/* I assume that stacklevel is a stronger indicator than PL_top_env changes */	1358	/* I assume that stacklevel is a stronger indicator than PL_top_env changes */
…		…
1393	++next->usecount;	1372	++next->usecount;
1394		1373
1395	if (expect_true (!next->cctx))	1374	if (expect_true (!next->cctx))
1396	next->cctx = cctx_get (aTHX);	1375	next->cctx = cctx_get (aTHX);
1397		1376
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))	1377	if (expect_false (prev__cctx != next->cctx))
1402	{	1378	{
1403	prev__cctx->top_env = PL_top_env;	1379	prev__cctx->top_env = PL_top_env;
1404	PL_top_env = next->cctx->top_env;	1380	PL_top_env = next->cctx->top_env;
1405	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);	1381	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
…		…
1418	coro_state_destroy (pTHX_ struct coro *coro)	1394	coro_state_destroy (pTHX_ struct coro *coro)
1419	{	1395	{
1420	if (coro->flags & CF_DESTROYED)	1396	if (coro->flags & CF_DESTROYED)
1421	return 0;	1397	return 0;
1422		1398
		1399	if (coro->on_destroy)
		1400	coro->on_destroy (aTHX_ coro);
		1401
1423	coro->flags |= CF_DESTROYED;	1402	coro->flags |= CF_DESTROYED;
1424		1403
1425	if (coro->flags & CF_READY)	1404	if (coro->flags & CF_READY)
1426	{	1405	{
1427	/* reduce nready, as destroying a ready coro effectively unreadies it */	1406	/* reduce nready, as destroying a ready coro effectively unreadies it */
1428	/* alternative: look through all ready queues and remove the coro */	1407	/* alternative: look through all ready queues and remove the coro */
1429	LOCK;
1430	--coro_nready;	1408	--coro_nready;
1431	UNLOCK;
1432	}	1409	}
1433	else	1410	else
1434	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */	1411	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1435		1412
1436	if (coro->mainstack && coro->mainstack != main_mainstack)	1413	if (coro->mainstack && coro->mainstack != main_mainstack)
1437	{	1414	{
1438	struct coro temp;	1415	struct coro temp;
1439		1416
1440	if (coro->flags & CF_RUNNING)	1417	assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1441	croak ("FATAL: tried to destroy currently running coroutine");
1442		1418
1443	save_perl (aTHX_ &temp);	1419	save_perl (aTHX_ &temp);
1444	load_perl (aTHX_ coro);	1420	load_perl (aTHX_ coro);
1445		1421
1446	coro_destruct (aTHX_ coro);	1422	coro_destruct (aTHX_ coro);
…		…
1497	# define MGf_DUP 0	1473	# define MGf_DUP 0
1498	#endif	1474	#endif
1499	};	1475	};
1500		1476
1501	static void	1477	static void
1502	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)	1478	prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1503	{	1479	{
1504	ta->prev = SvSTATE (prev_sv);	1480	ta->prev = SvSTATE (prev_sv);
1505	ta->next = SvSTATE (next_sv);	1481	ta->next = SvSTATE (next_sv);
1506	TRANSFER_CHECK (*ta);	1482	TRANSFER_CHECK (*ta);
1507	}	1483	}
1508		1484
1509	static void	1485	static void
1510	api_transfer (pTHX_ SV *prev_sv, SV *next_sv)	1486	api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1511	{	1487	{
1512	struct transfer_args ta;	1488	struct coro_transfer_args ta;
1513		1489
1514	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);	1490	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1515	TRANSFER (ta, 1);	1491	TRANSFER (ta, 1);
1516	}	1492	}
1517		1493
1518	/** Coro ********************************************************************/	1494	/** Coro ********************************************************************/
1519		1495
1520	static void	1496	INLINE void
1521	coro_enq (pTHX_ SV *coro_sv)	1497	coro_enq (pTHX_ struct coro *coro)
1522	{	1498	{
1523	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);	1499	av_push (coro_ready [coro->prio - PRIO_MIN], SvREFCNT_inc_NN (coro->hv));
1524	}	1500	}
1525		1501
1526	static SV *	1502	INLINE SV *
1527	coro_deq (pTHX)	1503	coro_deq (pTHX)
1528	{	1504	{
1529	int prio;	1505	int prio;
1530		1506
1531	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )	1507	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
…		…
1550	if (coro->flags & CF_READY)	1526	if (coro->flags & CF_READY)
1551	return 0;	1527	return 0;
1552		1528
1553	coro->flags |= CF_READY;	1529	coro->flags |= CF_READY;
1554		1530
1555	LOCK;
1556
1557	sv_hook = coro_nready ? 0 : coro_readyhook;	1531	sv_hook = coro_nready ? 0 : coro_readyhook;
1558	xs_hook = coro_nready ? 0 : coroapi.readyhook;	1532	xs_hook = coro_nready ? 0 : coroapi.readyhook;
1559		1533
1560	coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv));	1534	coro_enq (aTHX_ coro);
1561	++coro_nready;	1535	++coro_nready;
1562		1536
1563	UNLOCK;
1564
1565	if (sv_hook)	1537	if (sv_hook)
1566	{	1538	{
1567	dSP;	1539	dSP;
1568		1540
1569	ENTER;	1541	ENTER;
…		…
1589	{	1561	{
1590	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1562	return !!(SvSTATE (coro_sv)->flags & CF_READY);
1591	}	1563	}
1592		1564
1593	INLINE void	1565	INLINE void
1594	prepare_schedule (pTHX_ struct transfer_args *ta)	1566	prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1595	{	1567	{
1596	SV *prev_sv, *next_sv;	1568	SV *prev_sv, *next_sv;
1597		1569
1598	for (;;)	1570	for (;;)
1599	{	1571	{
1600	LOCK;
1601	next_sv = coro_deq (aTHX);	1572	next_sv = coro_deq (aTHX);
1602		1573
1603	/* nothing to schedule: call the idle handler */	1574	/* nothing to schedule: call the idle handler */
1604	if (expect_false (!next_sv))	1575	if (expect_false (!next_sv))
1605	{	1576	{
1606	dSP;	1577	dSP;
1607	UNLOCK;
1608		1578
1609	ENTER;	1579	ENTER;
1610	SAVETMPS;	1580	SAVETMPS;
1611		1581
1612	PUSHMARK (SP);	1582	PUSHMARK (SP);
…		…
1617	FREETMPS;	1587	FREETMPS;
1618	LEAVE;	1588	LEAVE;
1619	continue;	1589	continue;
1620	}	1590	}
1621		1591
1622	ta->next = SvSTATE (next_sv);	1592	ta->next = SvSTATE_hv (next_sv);
1623		1593
1624	/* cannot transfer to destroyed coros, skip and look for next */	1594	/* cannot transfer to destroyed coros, skip and look for next */
1625	if (expect_false (ta->next->flags & CF_DESTROYED))	1595	if (expect_false (ta->next->flags & CF_DESTROYED))
1626	{	1596	{
1627	UNLOCK;
1628	SvREFCNT_dec (next_sv);	1597	SvREFCNT_dec (next_sv);
1629	/* coro_nready has already been taken care of by destroy */	1598	/* coro_nready has already been taken care of by destroy */
1630	continue;	1599	continue;
1631	}	1600	}
1632		1601
1633	--coro_nready;	1602	--coro_nready;
1634	UNLOCK;
1635	break;	1603	break;
1636	}	1604	}
1637		1605
1638	/* free this only after the transfer */	1606	/* free this only after the transfer */
1639	prev_sv = SvRV (coro_current);	1607	prev_sv = SvRV (coro_current);
1640	ta->prev = SvSTATE (prev_sv);	1608	ta->prev = SvSTATE_hv (prev_sv);
1641	TRANSFER_CHECK (*ta);	1609	TRANSFER_CHECK (*ta);
1642	assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));	1610	assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1643	ta->next->flags &= ~CF_READY;	1611	ta->next->flags &= ~CF_READY;
1644	SvRV_set (coro_current, next_sv);	1612	SvRV_set (coro_current, next_sv);
1645		1613
1646	LOCK;
1647	free_coro_mortal (aTHX);	1614	free_coro_mortal (aTHX);
1648	coro_mortal = prev_sv;	1615	coro_mortal = prev_sv;
1649	UNLOCK;
1650	}	1616	}
1651		1617
1652	INLINE void	1618	INLINE void
1653	prepare_cede (pTHX_ struct transfer_args *ta)	1619	prepare_cede (pTHX_ struct coro_transfer_args *ta)
1654	{	1620	{
1655	api_ready (aTHX_ coro_current);	1621	api_ready (aTHX_ coro_current);
1656	prepare_schedule (aTHX_ ta);	1622	prepare_schedule (aTHX_ ta);
1657	}	1623	}
1658		1624
1659	static void	1625	INLINE void
1660	prepare_cede_notself (pTHX_ struct transfer_args *ta)	1626	prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1661	{	1627	{
1662	SV *prev = SvRV (coro_current);	1628	SV *prev = SvRV (coro_current);
1663		1629
1664	if (coro_nready)	1630	if (coro_nready)
1665	{	1631	{
1666	prepare_schedule (aTHX_ ta);	1632	prepare_schedule (aTHX_ ta);
1667	api_ready (aTHX_ prev);	1633	api_ready (aTHX_ prev);
1668	}	1634	}
1669	else	1635	else
1670	ta->prev = ta->next = SvSTATE (prev);	1636	prepare_nop (aTHX_ ta);
1671	}	1637	}
1672		1638
1673	static void	1639	static void
1674	api_schedule (pTHX)	1640	api_schedule (pTHX)
1675	{	1641	{
1676	struct transfer_args ta;	1642	struct coro_transfer_args ta;
1677		1643
1678	prepare_schedule (aTHX_ &ta);	1644	prepare_schedule (aTHX_ &ta);
1679	TRANSFER (ta, 1);	1645	TRANSFER (ta, 1);
1680	}	1646	}
1681		1647
1682	static int	1648	static int
1683	api_cede (pTHX)	1649	api_cede (pTHX)
1684	{	1650	{
1685	struct transfer_args ta;	1651	struct coro_transfer_args ta;
1686		1652
1687	prepare_cede (aTHX_ &ta);	1653	prepare_cede (aTHX_ &ta);
1688		1654
1689	if (expect_true (ta.prev != ta.next))	1655	if (expect_true (ta.prev != ta.next))
1690	{	1656	{
…		…
1698	static int	1664	static int
1699	api_cede_notself (pTHX)	1665	api_cede_notself (pTHX)
1700	{	1666	{
1701	if (coro_nready)	1667	if (coro_nready)
1702	{	1668	{
1703	struct transfer_args ta;	1669	struct coro_transfer_args ta;
1704		1670
1705	prepare_cede_notself (aTHX_ &ta);	1671	prepare_cede_notself (aTHX_ &ta);
1706	TRANSFER (ta, 1);	1672	TRANSFER (ta, 1);
1707	return 1;	1673	return 1;
1708	}	1674	}
…		…
1718	if (flags & CC_TRACE)	1684	if (flags & CC_TRACE)
1719	{	1685	{
1720	if (!coro->cctx)	1686	if (!coro->cctx)
1721	coro->cctx = cctx_new_run ();	1687	coro->cctx = cctx_new_run ();
1722	else if (!(coro->cctx->flags & CC_TRACE))	1688	else if (!(coro->cctx->flags & CC_TRACE))
1723	croak ("cannot enable tracing on coroutine with custom stack");	1689	croak ("cannot enable tracing on coroutine with custom stack,");
1724		1690
1725	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));	1691	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1726	}	1692	}
1727	else if (coro->cctx && coro->cctx->flags & CC_TRACE)	1693	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1728	{	1694	{
…		…
1732	PL_runops = RUNOPS_DEFAULT;	1698	PL_runops = RUNOPS_DEFAULT;
1733	else	1699	else
1734	coro->slot->runops = RUNOPS_DEFAULT;	1700	coro->slot->runops = RUNOPS_DEFAULT;
1735	}	1701	}
1736	}	1702	}
1737
1738	#if 0
1739	static int
1740	coro_gensub_free (pTHX_ SV *sv, MAGIC *mg)
1741	{
1742	AV *padlist;
1743	AV *av = (AV *)mg->mg_obj;
1744
1745	abort ();
1746
1747	return 0;
1748	}
1749
1750	static MGVTBL coro_gensub_vtbl = {
1751	0, 0, 0, 0,
1752	coro_gensub_free
1753	};
1754	#endif
1755		1703
1756	/*****************************************************************************/	1704	/*****************************************************************************/
1757	/* PerlIO::cede */	1705	/* PerlIO::cede */
1758		1706
1759	typedef struct	1707	typedef struct
…		…
1828	PerlIOBuf_set_ptrcnt,	1776	PerlIOBuf_set_ptrcnt,
1829	};	1777	};
1830		1778
1831	/*****************************************************************************/	1779	/*****************************************************************************/
1832		1780
1833	static const CV *slf_cv; /* for quick consistency check */
1834
1835	static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */	1781	static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
		1782	static const CV *slf_cv;
1836	static SV *slf_arg0;	1783	static SV **slf_argv;
1837	static SV *slf_arg1;	1784	static int slf_argc, slf_arga; /* count, allocated */
		1785	static I32 slf_ax; /* top of stack, for restore */
1838		1786
1839	/* this restores the stack in the case we patched the entersub, to */	1787	/* this restores the stack in the case we patched the entersub, to */
1840	/* recreate the stack frame as perl will on following calls */	1788	/* recreate the stack frame as perl will on following calls */
1841	/* since entersub cleared the stack */	1789	/* since entersub cleared the stack */
1842	static OP *	1790	static OP *
1843	pp_restore (pTHX)	1791	pp_restore (pTHX)
1844	{	1792	{
1845	dSP;	1793	int i;
		1794	SV **SP = PL_stack_base + slf_ax;
1846		1795
1847	PUSHMARK (SP);	1796	PUSHMARK (SP);
1848		1797
1849	EXTEND (SP, 3);	1798	EXTEND (SP, slf_argc + 1);
		1799
		1800	for (i = 0; i < slf_argc; ++i)
1850	if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));	1801	PUSHs (sv_2mortal (slf_argv [i]));
1851	if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));	1802
1852	PUSHs ((SV *)CvGV (slf_cv));	1803	PUSHs ((SV *)CvGV (slf_cv));
1853		1804
1854	RETURNOP (slf_restore.op_first);	1805	RETURNOP (slf_restore.op_first);
1855	}	1806	}
1856		1807
1857	#define OPpENTERSUB_SLF 15 /* the part of op_private entersub hopefully doesn't use */	1808	static void
		1809	slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
		1810	{
		1811	prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
		1812	}
1858		1813
1859	enum {	1814	static void
1860	CORO_SLF_CUSTOM = 0,	1815	slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1861	CORO_SLF_SET_STACKLEVEL = 1,	1816	{
1862	CORO_SLF_TRANSFER = 2	1817	assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
1863	};
1864		1818
1865	/* declare prototype */	1819	frame->prepare = slf_prepare_set_stacklevel;
1866	XS(XS_Coro__State__set_stacklevel);	1820	frame->check = slf_check_nop;
		1821	frame->data = (void *)SvIV (arg [0]);
		1822	}
		1823
		1824	static void
		1825	slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
		1826	{
		1827	SV **arg = (SV **)slf_frame.data;
		1828
		1829	prepare_transfer (aTHX_ ta, arg [0], arg [1]);
		1830	}
		1831
		1832	static void
		1833	slf_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
		1843	static void
		1844	slf_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
		1850	static void
		1851	slf_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
		1857	static void
		1858	slf_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
1867		1866
1868	/*	1867	/*
1869	* these not obviously related functions are all rolled into one	1868	* these not obviously related functions are all rolled into one
1870	* 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
1871	* stack offset	1870	* stack offset
1872	* SLF stands for "schedule-like-function".	1871	* SLF stands for "schedule-like-function".
1873	*/	1872	*/
1874	static OP *	1873	static OP *
1875	pp_slf (pTHX)	1874	pp_slf (pTHX)
1876	{	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 */
1877	dSP;	1884	dSP;
1878	struct transfer_args ta;
1879	SV **arg = PL_stack_base + TOPMARK + 1;	1885	SV **arg = PL_stack_base + TOPMARK + 1;
1880	int items = SP - arg; /* args without function object */	1886	int items = SP - arg; /* args without function object */
1881	int ix = PL_op->op_private & OPpENTERSUB_SLF;	1887	SV *gv = *sp;
1882	struct CoroSLF *slf = 0;
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;
1898	}	1900	}
1899		1901
		1902	/* now call the init function, which needs to set up slf_frame */
		1903	((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr)
		1904	(aTHX_ &slf_frame, GvCV (gv), arg, items);
		1905
		1906	/* pop args */
		1907	SP = PL_stack_base + POPMARK;
		1908
1900	PUTBACK;	1909	PUTBACK;
1901
1902	if (!ix)
1903	{	1910	}
1904	slf = (struct CoroSLF *)CvSTART (GvCV (*sp));
1905	ix = slf->prepare (aTHX_ arg, items);
1906	}
1907		1911
1908	switch (ix)	1912	/* now that we have a slf_frame, interpret it! */
1909	{	1913	/* we use a callback system not to make the code needlessly */
1910	case CORO_SLF_SET_STACKLEVEL:	1914	/* complicated, but so we can run multiple perl coros from one cctx */
1911	prepare_set_stacklevel (&ta, (struct coro_cctx *)SvIV (arg [0]));
1912	break;
1913
1914	case CORO_SLF_TRANSFER:
1915	if (items != 2)
1916	croak ("Coro::State::transfer (prev, next) expects two arguments, not %d.", items);
1917
1918	prepare_transfer (aTHX_ &ta, arg [0], arg [1]);
1919	break;
1920
1921	case CORO_SLF_SCHEDULE:
1922	prepare_schedule (aTHX_ &ta);
1923	break;
1924
1925	case CORO_SLF_CEDE:
1926	prepare_cede (aTHX_ &ta);
1927	break;
1928
1929	case CORO_SLF_CEDE_NOTSELF:
1930	prepare_cede_notself (aTHX_ &ta);
1931	break;
1932
1933	default:
1934	abort ();
1935	}
1936		1915
1937	do	1916	do
		1917	{
		1918	struct coro_transfer_args ta;
		1919
		1920	slf_frame.prepare (aTHX_ &ta);
1938	TRANSFER (ta, 0);	1921	TRANSFER (ta, 0);
1939	while (slf && slf->check (aTHX));
1940		1922
1941	SPAGAIN;	1923	checkmark = PL_stack_sp - PL_stack_base;
		1924	}
		1925	while (slf_frame.check (aTHX_ &slf_frame));
1942		1926
		1927	slf_frame.prepare = 0; /* invalidate the frame, we are done processing it */
		1928
		1929	/* return value handling - mostly like entersub */
		1930	{
		1931	dSP;
		1932	SV **bot = PL_stack_base + checkmark;
		1933	int gimme = GIMME_V;
		1934
		1935	/* make sure we put something on the stack in scalar context */
		1936	if (gimme == G_SCALAR)
		1937	{
		1938	if (sp == bot)
		1939	XPUSHs (&PL_sv_undef);
		1940
		1941	SP = bot + 1;
		1942	}
		1943
1943	PUTBACK;	1944	PUTBACK;
1944	SLF_TAIL;	1945	}
1945	SPAGAIN;
1946	RETURN;
1947	}
1948		1946
1949	static void	1947	/* exception handling */
1950	coro_slf_patch (pTHX_ CV *cv, int ix, SV **args, int items)	1948	if (expect_false (coro_throw))
1951	{	1949	{
1952	assert (("FATAL: SLF call recursion in Coro module (please report)", PL_op->op_ppaddr != pp_slf));	1950	SV *exception = sv_2mortal (coro_throw);
1953		1951
		1952	coro_throw = 0;
		1953	sv_setsv (ERRSV, exception);
		1954	croak (0);
		1955	}
		1956
		1957	return NORMAL;
		1958	}
		1959
		1960	static void
		1961	api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, I32 ax)
		1962	{
		1963	int i;
		1964	SV **arg = PL_stack_base + ax;
		1965	int items = PL_stack_sp - arg + 1;
		1966
1954	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	CvFLAGS (cv) |= CVf_SLF;
		1974	CvXSUBANY (cv).any_ptr = (void *)init_cb;
1955	slf_cv = cv;	1975	slf_cv = cv;
1956		1976
1957	/* we patch the op, and then re-run the whole call */	1977	/* we patch the op, and then re-run the whole call */
1958	/* we have to put the same argument on the stack for this to work */	1978	/* we have to put the same argument on the stack for this to work */
1959	/* and this will be done by pp_restore */	1979	/* and this will be done by pp_restore */
1960	slf_restore.op_next = (OP *)&slf_restore;	1980	slf_restore.op_next = (OP *)&slf_restore;
1961	slf_restore.op_type = OP_NULL;	1981	slf_restore.op_type = OP_CUSTOM;
1962	slf_restore.op_ppaddr = pp_restore;	1982	slf_restore.op_ppaddr = pp_restore;
1963	slf_restore.op_first = PL_op;	1983	slf_restore.op_first = PL_op;
1964		1984
1965	slf_arg0 = items > 0 ? SvREFCNT_inc (args [0]) : 0;	1985	slf_ax = ax - 1; /* undo the ax++ inside dAXMARK */
1966	slf_arg1 = items > 1 ? SvREFCNT_inc (args [1]) : 0;	1986
		1987	if (PL_op->op_flags & OPf_STACKED)
		1988	{
		1989	if (items > slf_arga)
		1990	{
		1991	slf_arga = items;
		1992	free (slf_argv);
		1993	slf_argv = malloc (slf_arga * sizeof (SV *));
		1994	}
		1995
		1996	slf_argc = items;
		1997
		1998	for (i = 0; i < items; ++i)
		1999	slf_argv [i] = SvREFCNT_inc (arg [i]);
		2000	}
		2001	else
		2002	slf_argc = 0;
1967		2003
1968	PL_op->op_ppaddr = pp_slf;	2004	PL_op->op_ppaddr = pp_slf;
1969	PL_op->op_private = PL_op->op_private & ~OPpENTERSUB_SLF | ix; /* we potentially share our private flags with entersub */	2005	PL_op->op_type = OP_CUSTOM; /* maybe we should leave it at entersub? */
1970		2006
1971	PL_op = (OP *)&slf_restore;	2007	PL_op = (OP *)&slf_restore;
1972	}	2008	}
1973		2009
		2010	/*****************************************************************************/
		2011
		2012	static void
		2013	coro_semaphore_adjust (pTHX_ AV *av, IV adjust)
		2014	{
		2015	SV *count_sv = AvARRAY (av)[0];
		2016	IV count = SvIVX (count_sv);
		2017
		2018	count += adjust;
		2019	SvIVX (count_sv) = count;
		2020
		2021	/* now wake up as many waiters as are expected to lock */
		2022	while (count > 0 && AvFILLp (av) > 0)
		2023	{
		2024	SV *cb;
		2025
		2026	/* swap first two elements so we can shift a waiter */
		2027	AvARRAY (av)[0] = AvARRAY (av)[1];
		2028	AvARRAY (av)[1] = count_sv;
		2029	cb = av_shift (av);
		2030
		2031	if (SvOBJECT (cb))
		2032	api_ready (aTHX_ cb);
		2033	else
		2034	croak ("callbacks not yet supported");
		2035
		2036	SvREFCNT_dec (cb);
		2037
		2038	--count;
		2039	}
		2040	}
		2041
		2042	static void
		2043	coro_semaphore_on_destroy (pTHX_ struct coro *coro)
		2044	{
		2045	/* call $sem->adjust (0) to possibly wake up some other waiters */
		2046	coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
		2047	}
		2048
		2049	static int
		2050	slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
		2051	{
		2052	AV *av = (AV *)frame->data;
		2053	SV *count_sv = AvARRAY (av)[0];
		2054
		2055	if (SvIVX (count_sv) > 0)
		2056	{
		2057	SvSTATE_current->on_destroy = 0;
		2058	SvIVX (count_sv) = SvIVX (count_sv) - 1;
		2059	return 0;
		2060	}
		2061	else
		2062	{
		2063	int i;
		2064	/* if we were woken up but can't down, we look through the whole */
		2065	/* waiters list and only add us if we aren't in there already */
		2066	/* this avoids some degenerate memory usage cases */
		2067
		2068	for (i = 1; i <= AvFILLp (av); ++i)
		2069	if (AvARRAY (av)[i] == SvRV (coro_current))
		2070	return 1;
		2071
		2072	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2073	return 1;
		2074	}
		2075	}
		2076
		2077	static void
		2078	slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		2079	{
		2080	AV *av = (AV *)SvRV (arg [0]);
		2081
		2082	if (SvIVX (AvARRAY (av)[0]) > 0)
		2083	{
		2084	frame->data = (void *)av;
		2085	frame->prepare = prepare_nop;
		2086	SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
		2087	}
		2088	else
		2089	{
		2090	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2091
		2092	frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
		2093	frame->prepare = prepare_schedule;
		2094
		2095	/* to avoid race conditions when a woken-up coro gets terminated */
		2096	/* we arrange for a temporary on_destroy that calls adjust (0) */
		2097	assert (!SvSTATE_current->on_destroy);//D
		2098	SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
		2099	}
		2100
		2101	frame->check = slf_check_semaphore_down;
		2102
		2103	}
		2104
		2105	/*****************************************************************************/
		2106
		2107	#define GENSUB_ARG CvXSUBANY (cv).any_ptr
		2108
		2109	/* create a closure from XS, returns a code reference */
		2110	/* the arg can be accessed via GENSUB_ARG from the callback */
		2111	/* the callback must use dXSARGS/XSRETURN */
		2112	static SV *
		2113	gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
		2114	{
		2115	CV *cv = (CV *)NEWSV (0, 0);
		2116
		2117	sv_upgrade ((SV *)cv, SVt_PVCV);
		2118
		2119	CvANON_on (cv);
		2120	CvISXSUB_on (cv);
		2121	CvXSUB (cv) = xsub;
		2122	GENSUB_ARG = arg;
		2123
		2124	return newRV_noinc ((SV *)cv);
		2125	}
		2126
		2127	/*****************************************************************************/
		2128
1974	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_	2129	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1975		2130
1976	PROTOTYPES: DISABLE	2131	PROTOTYPES: DISABLE
1977		2132
1978	BOOT:	2133	BOOT:
1979	{	2134	{
1980	#ifdef USE_ITHREADS	2135	#ifdef USE_ITHREADS
1981	MUTEX_INIT (&coro_lock);
1982	# if CORO_PTHREAD	2136	# if CORO_PTHREAD
1983	coro_thx = PERL_GET_CONTEXT;	2137	coro_thx = PERL_GET_CONTEXT;
1984	# endif	2138	# endif
1985	#endif	2139	#endif
1986	BOOT_PAGESIZE;	2140	BOOT_PAGESIZE;
…		…
2007	main_top_env = PL_top_env;	2161	main_top_env = PL_top_env;
2008		2162
2009	while (main_top_env->je_prev)	2163	while (main_top_env->je_prev)
2010	main_top_env = main_top_env->je_prev;	2164	main_top_env = main_top_env->je_prev;
2011		2165
		2166	{
		2167	SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
		2168
		2169	if (!PL_custom_op_names) PL_custom_op_names = newHV ();
		2170	hv_store_ent (PL_custom_op_names, slf,
		2171	newSVpv ("coro_slf", 0), 0);
		2172
		2173	if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
		2174	hv_store_ent (PL_custom_op_descs, slf,
		2175	newSVpv ("coro schedule like function", 0), 0);
		2176	}
		2177
2012	coroapi.ver = CORO_API_VERSION;	2178	coroapi.ver = CORO_API_VERSION;
2013	coroapi.rev = CORO_API_REVISION;	2179	coroapi.rev = CORO_API_REVISION;
		2180
2014	coroapi.transfer = api_transfer;	2181	coroapi.transfer = api_transfer;
		2182
		2183	coroapi.sv_state = SvSTATE_;
		2184	coroapi.execute_slf = api_execute_slf;
		2185	coroapi.prepare_nop = prepare_nop;
		2186	coroapi.prepare_schedule = prepare_schedule;
		2187	coroapi.prepare_cede = prepare_cede;
		2188	coroapi.prepare_cede_notself = prepare_cede_notself;
2015		2189
2016	{	2190	{
2017	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);	2191	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2018		2192
2019	if (!svp) croak ("Time::HiRes is required");	2193	if (!svp) croak ("Time::HiRes is required");
…		…
2054	OUTPUT:	2228	OUTPUT:
2055	RETVAL	2229	RETVAL
2056		2230
2057	void	2231	void
2058	_set_stacklevel (...)	2232	_set_stacklevel (...)
2059	ALIAS:	2233	CODE:
2060	_set_stacklevel = CORO_SLF_SET_STACKLEVEL	2234	CORO_EXECUTE_SLF_XS (slf_init_set_stacklevel);
2061	Coro::State::transfer = CORO_SLF_TRANSFER	2235
2062	Coro::schedule = CORO_SLF_SCHEDULE	2236	void
2063	Coro::cede = CORO_SLF_CEDE	2237	transfer (...)
2064	Coro::cede_notself = CORO_SLF_CEDE_NOTSELF	2238	PROTOTYPE: $$
2065	CODE:	2239	CODE:
2066	coro_slf_patch (aTHX_ cv, ix, &ST (0), items);	2240	CORO_EXECUTE_SLF_XS (slf_init_transfer);
2067		2241
2068	bool	2242	bool
2069	_destroy (SV *coro_sv)	2243	_destroy (SV *coro_sv)
2070	CODE:	2244	CODE:
2071	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));	2245	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
…		…
2078	CODE:	2252	CODE:
2079	_exit (code);	2253	_exit (code);
2080		2254
2081	int	2255	int
2082	cctx_stacksize (int new_stacksize = 0)	2256	cctx_stacksize (int new_stacksize = 0)
		2257	PROTOTYPE: ;$
2083	CODE:	2258	CODE:
2084	RETVAL = cctx_stacksize;	2259	RETVAL = cctx_stacksize;
2085	if (new_stacksize)	2260	if (new_stacksize)
2086	{	2261	{
2087	cctx_stacksize = new_stacksize;	2262	cctx_stacksize = new_stacksize;
…		…
2090	OUTPUT:	2265	OUTPUT:
2091	RETVAL	2266	RETVAL
2092		2267
2093	int	2268	int
2094	cctx_max_idle (int max_idle = 0)	2269	cctx_max_idle (int max_idle = 0)
		2270	PROTOTYPE: ;$
2095	CODE:	2271	CODE:
2096	RETVAL = cctx_max_idle;	2272	RETVAL = cctx_max_idle;
2097	if (max_idle > 1)	2273	if (max_idle > 1)
2098	cctx_max_idle = max_idle;	2274	cctx_max_idle = max_idle;
2099	OUTPUT:	2275	OUTPUT:
2100	RETVAL	2276	RETVAL
2101		2277
2102	int	2278	int
2103	cctx_count ()	2279	cctx_count ()
		2280	PROTOTYPE:
2104	CODE:	2281	CODE:
2105	RETVAL = cctx_count;	2282	RETVAL = cctx_count;
2106	OUTPUT:	2283	OUTPUT:
2107	RETVAL	2284	RETVAL
2108		2285
2109	int	2286	int
2110	cctx_idle ()	2287	cctx_idle ()
		2288	PROTOTYPE:
2111	CODE:	2289	CODE:
2112	RETVAL = cctx_idle;	2290	RETVAL = cctx_idle;
2113	OUTPUT:	2291	OUTPUT:
2114	RETVAL	2292	RETVAL
2115		2293
2116	void	2294	void
2117	list ()	2295	list ()
		2296	PROTOTYPE:
2118	PPCODE:	2297	PPCODE:
2119	{	2298	{
2120	struct coro *coro;	2299	struct coro *coro;
2121	for (coro = coro_first; coro; coro = coro->next)	2300	for (coro = coro_first; coro; coro = coro->next)
2122	if (coro->hv)	2301	if (coro->hv)
…		…
2184		2363
2185	void	2364	void
2186	throw (Coro::State self, SV *throw = &PL_sv_undef)	2365	throw (Coro::State self, SV *throw = &PL_sv_undef)
2187	PROTOTYPE: $;$	2366	PROTOTYPE: $;$
2188	CODE:	2367	CODE:
		2368	{
		2369	struct coro *current = SvSTATE_current;
		2370	SV **throwp = self == current ? &coro_throw : &self->throw;
2189	SvREFCNT_dec (self->throw);	2371	SvREFCNT_dec (*throwp);
2190	self->throw = SvOK (throw) ? newSVsv (throw) : 0;	2372	*throwp = SvOK (throw) ? newSVsv (throw) : 0;
		2373	}
2191		2374
2192	void	2375	void
2193	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)	2376	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		2377	PROTOTYPE: $;$
2194	C_ARGS: aTHX_ coro, flags	2378	C_ARGS: aTHX_ coro, flags
2195		2379
2196	SV *	2380	SV *
2197	has_cctx (Coro::State coro)	2381	has_cctx (Coro::State coro)
2198	PROTOTYPE: $	2382	PROTOTYPE: $
…		…
2223	OUTPUT:	2407	OUTPUT:
2224	RETVAL	2408	RETVAL
2225		2409
2226	void	2410	void
2227	force_cctx ()	2411	force_cctx ()
		2412	PROTOTYPE:
2228	CODE:	2413	CODE:
2229	struct coro *coro = SvSTATE (coro_current);
2230	coro->cctx->idle_sp = 0;	2414	SvSTATE_current->cctx->idle_sp = 0;
2231		2415
2232	void	2416	void
2233	swap_defsv (Coro::State self)	2417	swap_defsv (Coro::State self)
2234	PROTOTYPE: $	2418	PROTOTYPE: $
2235	ALIAS:	2419	ALIAS:
2236	swap_defav = 1	2420	swap_defav = 1
2237	CODE:	2421	CODE:
2238	if (!self->slot)	2422	if (!self->slot)
2239	croak ("cannot swap state with coroutine that has no saved state");	2423	croak ("cannot swap state with coroutine that has no saved state,");
2240	else	2424	else
2241	{	2425	{
2242	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);	2426	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2243	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;	2427	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
2244		2428
…		…
2286	SvREADONLY_on (sv);	2470	SvREADONLY_on (sv);
2287	}	2471	}
2288	}	2472	}
2289		2473
2290	void	2474	void
		2475	schedule (...)
		2476	CODE:
		2477	CORO_EXECUTE_SLF_XS (slf_init_schedule);
		2478
		2479	void
		2480	cede (...)
		2481	CODE:
		2482	CORO_EXECUTE_SLF_XS (slf_init_cede);
		2483
		2484	void
		2485	cede_notself (...)
		2486	CODE:
		2487	CORO_EXECUTE_SLF_XS (slf_init_cede_notself);
		2488
		2489	void
2291	_set_current (SV *current)	2490	_set_current (SV *current)
2292	PROTOTYPE: $	2491	PROTOTYPE: $
2293	CODE:	2492	CODE:
2294	SvREFCNT_dec (SvRV (coro_current));	2493	SvREFCNT_dec (SvRV (coro_current));
2295	SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));	2494	SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
2296		2495
2297	void	2496	void
2298	_set_readyhook (SV *hook)	2497	_set_readyhook (SV *hook)
2299	PROTOTYPE: $	2498	PROTOTYPE: $
2300	CODE:	2499	CODE:
2301	LOCK;
2302	SvREFCNT_dec (coro_readyhook);	2500	SvREFCNT_dec (coro_readyhook);
2303	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;	2501	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2304	UNLOCK;
2305		2502
2306	int	2503	int
2307	prio (Coro::State coro, int newprio = 0)	2504	prio (Coro::State coro, int newprio = 0)
		2505	PROTOTYPE: $;$
2308	ALIAS:	2506	ALIAS:
2309	nice = 1	2507	nice = 1
2310	CODE:	2508	CODE:
2311	{	2509	{
2312	RETVAL = coro->prio;	2510	RETVAL = coro->prio;
…		…
2344	# for async_pool speedup	2542	# for async_pool speedup
2345	void	2543	void
2346	_pool_1 (SV *cb)	2544	_pool_1 (SV *cb)
2347	CODE:	2545	CODE:
2348	{	2546	{
2349	struct coro *coro = SvSTATE (coro_current);
2350	HV *hv = (HV *)SvRV (coro_current);	2547	HV *hv = (HV *)SvRV (coro_current);
		2548	struct coro *coro = SvSTATE_hv ((SV *)hv);
2351	AV *defav = GvAV (PL_defgv);	2549	AV *defav = GvAV (PL_defgv);
2352	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);	2550	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2353	AV *invoke_av;	2551	AV *invoke_av;
2354	int i, len;	2552	int i, len;
2355		2553
…		…
2376	{	2574	{
2377	av_fill (defav, len - 1);	2575	av_fill (defav, len - 1);
2378	for (i = 0; i < len; ++i)	2576	for (i = 0; i < len; ++i)
2379	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));	2577	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2380	}	2578	}
2381
2382	SvREFCNT_dec (invoke);
2383	}	2579	}
2384		2580
2385	void	2581	void
2386	_pool_2 (SV *cb)	2582	_pool_2 (SV *cb)
2387	CODE:	2583	CODE:
2388	{	2584	{
2389	struct coro *coro = SvSTATE (coro_current);	2585	HV *hv = (HV *)SvRV (coro_current);
		2586	struct coro *coro = SvSTATE_hv ((SV *)hv);
2390		2587
2391	sv_setsv (cb, &PL_sv_undef);	2588	sv_setsv (cb, &PL_sv_undef);
2392		2589
2393	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;	2590	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2394	coro->saved_deffh = 0;	2591	coro->saved_deffh = 0;
…		…
2401	SvREFCNT_dec (old);	2598	SvREFCNT_dec (old);
2402	croak ("\3async_pool terminate\2\n");	2599	croak ("\3async_pool terminate\2\n");
2403	}	2600	}
2404		2601
2405	av_clear (GvAV (PL_defgv));	2602	av_clear (GvAV (PL_defgv));
2406	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,	2603	hv_store (hv, "desc", sizeof ("desc") - 1,
2407	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);	2604	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2408		2605
2409	coro->prio = 0;	2606	coro->prio = 0;
2410		2607
2411	if (coro->cctx && (coro->cctx->flags & CC_TRACE))	2608	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2412	api_trace (aTHX_ coro_current, 0);	2609	api_trace (aTHX_ coro_current, 0);
2413		2610
2414	av_push (av_async_pool, newSVsv (coro_current));	2611	av_push (av_async_pool, newSVsv (coro_current));
2415	}	2612	}
2416		2613
2417	#if 0
2418
2419	void
2420	_generator_call (...)
2421	PROTOTYPE: @
2422	PPCODE:
2423	fprintf (stderr, "call %p\n", CvXSUBANY(cv).any_ptr);
2424	xxxx
2425	abort ();
2426
2427	SV *
2428	gensub (SV *sub, ...)
2429	PROTOTYPE: &;@
2430	CODE:
2431	{
2432	struct coro *coro;
2433	MAGIC *mg;
2434	CV *xcv;
2435	CV *ncv = (CV *)newSV_type (SVt_PVCV);
2436	int i;
2437
2438	CvGV (ncv) = CvGV (cv);
2439	CvFILE (ncv) = CvFILE (cv);
2440
2441	Newz (0, coro, 1, struct coro);
2442	coro->args = newAV ();
2443	coro->flags = CF_NEW;
2444
2445	av_extend (coro->args, items - 1);
2446	for (i = 1; i < items; i++)
2447	av_push (coro->args, newSVsv (ST (i)));
2448
2449	CvISXSUB_on (ncv);
2450	CvXSUBANY (ncv).any_ptr = (void *)coro;
2451
2452	xcv = GvCV (gv_fetchpv ("Coro::_generator_call", 0, SVt_PVCV));
2453
2454	CvXSUB (ncv) = CvXSUB (xcv);
2455	CvANON_on (ncv);
2456
2457	mg = sv_magicext ((SV *)ncv, 0, CORO_MAGIC_type_state, &coro_gensub_vtbl, (char *)coro, 0);
2458	RETVAL = newRV_noinc ((SV *)ncv);
2459	}
2460	OUTPUT:
2461	RETVAL
2462
2463	#endif
2464
2465		2614
2466	MODULE = Coro::State PACKAGE = Coro::AIO	2615	MODULE = Coro::State PACKAGE = Coro::AIO
2467		2616
2468	void	2617	void
2469	_get_state (SV *self)	2618	_get_state (SV *self)
		2619	PROTOTYPE: $
2470	PPCODE:	2620	PPCODE:
2471	{	2621	{
2472	AV *defav = GvAV (PL_defgv);	2622	AV *defav = GvAV (PL_defgv);
2473	AV *av = newAV ();	2623	AV *av = newAV ();
2474	int i;	2624	int i;
…		…
2517	MODULE = Coro::State PACKAGE = Coro::AnyEvent	2667	MODULE = Coro::State PACKAGE = Coro::AnyEvent
2518		2668
2519	BOOT:	2669	BOOT:
2520	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);	2670	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2521		2671
2522	SV *	2672	void
2523	_schedule (...)	2673	_schedule (...)
2524	PROTOTYPE: @
2525	CODE:	2674	CODE:
2526	{	2675	{
2527	static int incede;	2676	static int incede;
2528		2677
2529	api_cede_notself (aTHX);	2678	api_cede_notself (aTHX);
…		…
2548	MODULE = Coro::State PACKAGE = PerlIO::cede	2697	MODULE = Coro::State PACKAGE = PerlIO::cede
2549		2698
2550	BOOT:	2699	BOOT:
2551	PerlIO_define_layer (aTHX_ &PerlIO_cede);	2700	PerlIO_define_layer (aTHX_ &PerlIO_cede);
2552		2701
		2702	MODULE = Coro::State PACKAGE = Coro::Semaphore
		2703
		2704	SV *
		2705	new (SV *klass, SV *count_ = 0)
		2706	CODE:
		2707	{
		2708	/* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
		2709	AV *av = newAV ();
		2710	av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
		2711	RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
		2712	}
		2713	OUTPUT:
		2714	RETVAL
		2715
		2716	SV *
		2717	count (SV *self)
		2718	CODE:
		2719	RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
		2720	OUTPUT:
		2721	RETVAL
		2722
		2723	void
		2724	up (SV *self, int adjust = 1)
		2725	ALIAS:
		2726	adjust = 1
		2727	CODE:
		2728	coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
		2729
		2730	void
		2731	down (SV *self)
		2732	CODE:
		2733	CORO_EXECUTE_SLF_XS (slf_init_semaphore_down);
		2734
		2735	void
		2736	try (SV *self)
		2737	PPCODE:
		2738	{
		2739	AV *av = (AV *)SvRV (self);
		2740	SV *count_sv = AvARRAY (av)[0];
		2741	IV count = SvIVX (count_sv);
		2742
		2743	if (count > 0)
		2744	{
		2745	--count;
		2746	SvIVX (count_sv) = count;
		2747	XSRETURN_YES;
		2748	}
		2749	else
		2750	XSRETURN_NO;
		2751	}
		2752
		2753	void
		2754	waiters (SV *self)
		2755	CODE:
		2756	{
		2757	AV *av = (AV *)SvRV (self);
		2758
		2759	if (GIMME_V == G_SCALAR)
		2760	XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
		2761	else
		2762	{
		2763	int i;
		2764	EXTEND (SP, AvFILLp (av) + 1 - 1);
		2765	for (i = 1; i <= AvFILLp (av); ++i)
		2766	PUSHs (newSVsv (AvARRAY (av)[i]));
		2767	}
		2768	}
		2769

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