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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.267 by root, Fri Nov 14 06:29:52 2008 UTC vs.
Revision 1.281 by root, Sun Nov 16 10:12:38 2008 UTC

…		…
116	# define CORO_PREFER_PERL_FUNCTIONS 0	116	# define CORO_PREFER_PERL_FUNCTIONS 0
117	#endif	117	#endif
118		118
119	/* The next macros try to return the current stack pointer, in an as	119	/* The next macros try to return the current stack pointer, in an as
120	* portable way as possible. */	120	* portable way as possible. */
121	#define dSTACKLEVEL volatile char stacklevel	121	#if __GNUC__ >= 4
122	#define STACKLEVEL ((void *)&stacklevel)	122	# define dSTACKLEVEL void *stacklevel = __builtin_frame_address (0)
		123	#else
		124	# define dSTACKLEVEL volatile void *stacklevel = (volatile void *)&stacklevel
		125	#endif
123		126
124	#define IN_DESTRUCT (PL_main_cv == Nullcv)	127	#define IN_DESTRUCT (PL_main_cv == Nullcv)
125		128
126	#if __GNUC__ >= 3	129	#if __GNUC__ >= 3
127	# define attribute(x) __attribute__(x)	130	# define attribute(x) __attribute__(x)
…		…
139	#define NOINLINE attribute ((noinline))	142	#define NOINLINE attribute ((noinline))
140		143
141	#include "CoroAPI.h"	144	#include "CoroAPI.h"
142		145
143	#ifdef USE_ITHREADS	146	#ifdef USE_ITHREADS
144
145	static perl_mutex coro_lock;
146	# define LOCK do { MUTEX_LOCK (&coro_lock); } while (0)
147	# define UNLOCK do { MUTEX_UNLOCK (&coro_lock); } while (0)
148	# if CORO_PTHREAD	147	# if CORO_PTHREAD
149	static void *coro_thx;	148	static void *coro_thx;
150	# endif	149	# endif
151
152	#else
153
154	# define LOCK (void)0
155	# define UNLOCK (void)0
156
157	#endif	150	#endif
158
159	# undef LOCK
160	# define LOCK (void)0
161	# undef UNLOCK
162	# define UNLOCK (void)0
163		151
164	/* helper storage struct for Coro::AIO */	152	/* helper storage struct for Coro::AIO */
165	struct io_state	153	struct io_state
166	{	154	{
167	AV *res;	155	AV *res;
…		…
180	static JMPENV *main_top_env;	168	static JMPENV *main_top_env;
181	static HV *coro_state_stash, *coro_stash;	169	static HV *coro_state_stash, *coro_stash;
182	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 */
183	static volatile struct coro *transfer_next;	171	static volatile struct coro *transfer_next;
184		172
185	struct transfer_args
186	{
187	struct coro *prev, *next;
188	};
189
190	static GV *irsgv; /* $/ */	173	static GV *irsgv; /* $/ */
191	static GV *stdoutgv; /* *STDOUT */	174	static GV *stdoutgv; /* *STDOUT */
192	static SV *rv_diehook;	175	static SV *rv_diehook;
193	static SV *rv_warnhook;	176	static SV *rv_warnhook;
194	static HV *hv_sig; /* %SIG */	177	static HV *hv_sig; /* %SIG */
…		…
212	CC_TRACE_LINE = 0x10, /* trace each statement */	195	CC_TRACE_LINE = 0x10, /* trace each statement */
213	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,	196	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
214	};	197	};
215		198
216	/* this is a structure representing a c-level coroutine */	199	/* this is a structure representing a c-level coroutine */
217	typedef struct coro_cctx {	200	typedef struct coro_cctx
		201	{
218	struct coro_cctx *next;	202	struct coro_cctx *next;
219		203
220	/* the stack */	204	/* the stack */
221	void *sptr;	205	void *sptr;
222	size_t ssize;	206	size_t ssize;
…		…
240	CF_NEW = 0x0004, /* has never been switched to */	224	CF_NEW = 0x0004, /* has never been switched to */
241	CF_DESTROYED = 0x0008, /* coroutine data has been freed */	225	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
242	};	226	};
243		227
244	/* the structure where most of the perl state is stored, overlaid on the cxstack */	228	/* the structure where most of the perl state is stored, overlaid on the cxstack */
245	typedef struct {	229	typedef struct
		230	{
246	SV *defsv;	231	SV *defsv;
247	AV *defav;	232	AV *defav;
248	SV *errsv;	233	SV *errsv;
249	SV *irsgv;	234	SV *irsgv;
250	#define VAR(name,type) type name;	235	#define VAR(name,type) type name;
…		…
254		239
255	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))	240	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
256		241
257	/* this is a structure representing a perl-level coroutine */	242	/* this is a structure representing a perl-level coroutine */
258	struct coro {	243	struct coro {
259	/* the c coroutine allocated to this perl coroutine, if any */	244	/* the C coroutine allocated to this perl coroutine, if any */
260	coro_cctx *cctx;	245	coro_cctx *cctx;
261		246
262	/* process data */	247	/* process data */
		248	struct CoroSLF slf_frame; /* saved slf frame */
263	AV *mainstack;	249	AV *mainstack;
264	perl_slots *slot; /* basically the saved sp */	250	perl_slots *slot; /* basically the saved sp */
265		251
266	AV *args; /* data associated with this coroutine (initial args) */	252	AV *args; /* data associated with this coroutine (initial args) */
267	int refcnt; /* coroutines are refcounted, yes */	253	int refcnt; /* coroutines are refcounted, yes */
268	int flags; /* CF_ flags */	254	int flags; /* CF_ flags */
269	HV *hv; /* the perl hash associated with this coro, if any */	255	HV *hv; /* the perl hash associated with this coro, if any */
		256	void (*on_destroy)(pTHX_ struct coro *coro);
270		257
271	/* statistics */	258	/* statistics */
272	int usecount; /* number of transfers to this coro */	259	int usecount; /* number of transfers to this coro */
273		260
274	/* coro process data */	261	/* coro process data */
…		…
282	struct coro *next, *prev;	269	struct coro *next, *prev;
283	};	270	};
284		271
285	typedef struct coro *Coro__State;	272	typedef struct coro *Coro__State;
286	typedef struct coro *Coro__State_or_hashref;	273	typedef struct coro *Coro__State_or_hashref;
		274
		275	static struct CoroSLF slf_frame; /* the current slf frame */
287		276
288	/** Coro ********************************************************************/	277	/** Coro ********************************************************************/
289		278
290	#define PRIO_MAX 3	279	#define PRIO_MAX 3
291	#define PRIO_HIGH 1	280	#define PRIO_HIGH 1
…		…
296		285
297	/* for Coro.pm */	286	/* for Coro.pm */
298	static SV *coro_current;	287	static SV *coro_current;
299	static SV *coro_readyhook;	288	static SV *coro_readyhook;
300	static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];	289	static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
301	static int coro_nready;
302	static struct coro *coro_first;	290	static struct coro *coro_first;
		291	#define coro_nready coroapi.nready
303		292
304	/** lowlevel stuff **********************************************************/	293	/** lowlevel stuff **********************************************************/
305		294
306	static SV *	295	static SV *
307	coro_get_sv (pTHX_ const char *name, int create)	296	coro_get_sv (pTHX_ const char *name, int create)
…		…
400	static MGVTBL coro_cv_vtbl = {	389	static MGVTBL coro_cv_vtbl = {
401	0, 0, 0, 0,	390	0, 0, 0, 0,
402	coro_cv_free	391	coro_cv_free
403	};	392	};
404		393
405	#define CORO_MAGIC(sv, type) \	394	#define CORO_MAGIC(sv, type) \
406	SvMAGIC (sv) \	395	expect_true (SvMAGIC (sv)) \
407	? SvMAGIC (sv)->mg_type == type \	396	? expect_true (SvMAGIC (sv)->mg_type == type) \
408	? SvMAGIC (sv) \	397	? SvMAGIC (sv) \
409	: mg_find (sv, type) \	398	: mg_find (sv, type) \
410	: 0	399	: 0
411		400
412	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)	401	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
413	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)	402	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
414		403
…		…
435	mg = CORO_MAGIC_state (coro);	424	mg = CORO_MAGIC_state (coro);
436	return (struct coro *)mg->mg_ptr;	425	return (struct coro *)mg->mg_ptr;
437	}	426	}
438		427
439	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))	428	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		429
		430	/* fastert than SvSTATE, but expects a coroutine hv */
		431	INLINE struct coro *
		432	SvSTATE_hv (SV *sv)
		433	{
		434	MAGIC *mg = expect_true (SvMAGIC (sv)->mg_type == CORO_MAGIC_type_state)
		435	? SvMAGIC (sv)
		436	: mg_find (sv, CORO_MAGIC_type_state);
		437
		438	return (struct coro *)mg->mg_ptr;
		439	}
		440
		441	#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
440		442
441	/* the next two functions merely cache the padlists */	443	/* the next two functions merely cache the padlists */
442	static void	444	static void
443	get_padlist (pTHX_ CV *cv)	445	get_padlist (pTHX_ CV *cv)
444	{	446	{
…		…
511	CvPADLIST (cv) = (AV *)POPs;	513	CvPADLIST (cv) = (AV *)POPs;
512	}	514	}
513		515
514	PUTBACK;	516	PUTBACK;
515	}	517	}
		518
		519	slf_frame = c->slf_frame;
516	}	520	}
517		521
518	static void	522	static void
519	save_perl (pTHX_ Coro__State c)	523	save_perl (pTHX_ Coro__State c)
520	{	524	{
		525	c->slf_frame = slf_frame;
		526
521	{	527	{
522	dSP;	528	dSP;
523	I32 cxix = cxstack_ix;	529	I32 cxix = cxstack_ix;
524	PERL_CONTEXT *ccstk = cxstack;	530	PERL_CONTEXT *ccstk = cxstack;
525	PERL_SI *top_si = PL_curstackinfo;	531	PERL_SI *top_si = PL_curstackinfo;
…		…
592	#undef VAR	598	#undef VAR
593	}	599	}
594	}	600	}
595		601
596	/*	602	/*
597	* allocate various perl stacks. This is an exact copy	603	* allocate various perl stacks. This is almost an exact copy
598	* of perl.c:init_stacks, except that it uses less memory	604	* of perl.c:init_stacks, except that it uses less memory
599	* on the (sometimes correct) assumption that coroutines do	605	* on the (sometimes correct) assumption that coroutines do
600	* not usually need a lot of stackspace.	606	* not usually need a lot of stackspace.
601	*/	607	*/
602	#if CORO_PREFER_PERL_FUNCTIONS	608	#if CORO_PREFER_PERL_FUNCTIONS
…		…
709	#endif	715	#endif
710	}	716	}
711	}	717	}
712		718
713	return rss;	719	return rss;
714	}
715
716	/** set stacklevel support **************************************************/
717
718	/* we sometimes need to create the effect of pp_set_stacklevel calling us */
719	#define SSL_HEAD (void)0
720	/* we sometimes need to create the effect of leaving via pp_set_stacklevel */
721	#define SSL_TAIL set_stacklevel_tail (aTHX)
722
723	INLINE void
724	set_stacklevel_tail (pTHX)
725	{
726	dSP;
727	SV **bot = SP;
728
729	int gimme = GIMME_V;
730
731	/* make sure we put something on the stack in scalar context */
732	if (gimme == G_SCALAR)
733	{
734	if (sp == bot)
735	XPUSHs (&PL_sv_undef);
736
737	SP = bot + 1;
738	}
739
740	PUTBACK;
741	}	720	}
742		721
743	/** coroutine stack handling ************************************************/	722	/** coroutine stack handling ************************************************/
744		723
745	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);	724	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
…		…
831		810
832	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;	811	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
833	}	812	}
834		813
835	static void	814	static void
		815	prepare_nop (pTHX_ struct coro_transfer_args *ta)
		816	{
		817	/* kind of mega-hacky, but works */
		818	ta->next = ta->prev = (struct coro *)ta;
		819	}
		820
		821	static int
		822	slf_check_nop (pTHX_ struct CoroSLF *frame)
		823	{
		824	return 0;
		825	}
		826
		827	static void
836	coro_setup (pTHX_ struct coro *coro)	828	coro_setup (pTHX_ struct coro *coro)
837	{	829	{
838	/*	830	/*
839	* emulate part of the perl startup here.	831	* emulate part of the perl startup here.
840	*/	832	*/
…		…
879	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	871	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
880	SPAGAIN;	872	SPAGAIN;
881	}	873	}
882		874
883	/* this newly created coroutine might be run on an existing cctx which most	875	/* this newly created coroutine might be run on an existing cctx which most
884	* likely was suspended in set_stacklevel, called from pp_set_stacklevel,	876	* likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
885	* so we have to emulate entering pp_set_stacklevel here.
886	*/	877	*/
887	SSL_HEAD;	878	slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
		879	slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
888	}	880	}
889		881
890	static void	882	static void
891	coro_destruct (pTHX_ struct coro *coro)	883	coro_destruct (pTHX_ struct coro *coro)
892	{	884	{
…		…
936	static int	928	static int
937	runops_trace (pTHX)	929	runops_trace (pTHX)
938	{	930	{
939	COP *oldcop = 0;	931	COP *oldcop = 0;
940	int oldcxix = -2;	932	int oldcxix = -2;
941	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */	933	struct coro *coro = SvSTATE_current; /* trace cctx is tied to specific coro */
942	coro_cctx *cctx = coro->cctx;	934	coro_cctx *cctx = coro->cctx;
943		935
944	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))	936	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
945	{	937	{
946	PERL_ASYNC_CHECK ();	938	PERL_ASYNC_CHECK ();
…		…
1056	TAINT_NOT;	1048	TAINT_NOT;
1057	return 0;	1049	return 0;
1058	}	1050	}
1059		1051
1060	static void	1052	static void
1061	prepare_set_stacklevel (struct transfer_args *ta, struct coro_cctx *cctx)	1053	prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1062	{	1054	{
1063	ta->prev = (struct coro *)cctx;	1055	ta->prev = (struct coro *)cctx;
1064	ta->next = 0;	1056	ta->next = 0;
1065	}	1057	}
1066		1058
…		…
1100	struct coro *next = (struct coro *)transfer_next;	1092	struct coro *next = (struct coro *)transfer_next;
1101	assert (!(transfer_next = 0)); /* just used for the side effect when asserts are enabled */	1093	assert (!(transfer_next = 0)); /* just used for the side effect when asserts are enabled */
1102	assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));	1094	assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));
1103		1095
1104	free_coro_mortal (aTHX);	1096	free_coro_mortal (aTHX);
1105	UNLOCK;
1106		1097
1107	if (expect_false (next->throw))	1098	if (expect_false (next->throw))
1108	{	1099	{
1109	SV *exception = sv_2mortal (next->throw);	1100	SV *exception = sv_2mortal (next->throw);
1110		1101
…		…
1126	# endif	1117	# endif
1127	#endif	1118	#endif
1128	{	1119	{
1129	dTHX;	1120	dTHX;
1130		1121
1131	/* we are the alternative tail to pp_set_stacklevel */	1122	/* normally we would need to skip the entersub here */
1132	/* so do the same things here */	1123	/* not doing so will re-execute it, which is exactly what we want */
1133	SSL_TAIL;
1134
1135	/* we now skip the op that did lead to transfer() */
1136	PL_op = PL_op->op_next;	1124	/* PL_nop = PL_nop->op_next */
1137		1125
1138	/* inject a fake subroutine call to cctx_init */	1126	/* inject a fake subroutine call to cctx_init */
1139	cctx_prepare (aTHX_ (coro_cctx *)arg);	1127	cctx_prepare (aTHX_ (coro_cctx *)arg);
1140		1128
1141	/* cctx_run is the alternative tail of transfer() */	1129	/* cctx_run is the alternative tail of transfer() */
		1130	/* TODO: throwing an exception here might be deadly, VERIFY */
1142	transfer_tail (aTHX);	1131	transfer_tail (aTHX);
1143		1132
1144	/* somebody or something will hit me for both perl_run and PL_restartop */	1133	/* somebody or something will hit me for both perl_run and PL_restartop */
1145	PL_restartop = PL_op;	1134	PL_restartop = PL_op;
1146	perl_run (PL_curinterp);	1135	perl_run (PL_curinterp);
…		…
1305	transfer_check (pTHX_ struct coro *prev, struct coro *next)	1294	transfer_check (pTHX_ struct coro *prev, struct coro *next)
1306	{	1295	{
1307	if (expect_true (prev != next))	1296	if (expect_true (prev != next))
1308	{	1297	{
1309	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))	1298	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1310	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");	1299	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1311		1300
1312	if (expect_false (next->flags & CF_RUNNING))	1301	if (expect_false (next->flags & CF_RUNNING))
1313	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");	1302	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1314		1303
1315	if (expect_false (next->flags & CF_DESTROYED))	1304	if (expect_false (next->flags & CF_DESTROYED))
1316	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");	1305	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1317		1306
1318	#if !PERL_VERSION_ATLEAST (5,10,0)	1307	#if !PERL_VERSION_ATLEAST (5,10,0)
1319	if (expect_false (PL_lex_state != LEX_NOTPARSING))	1308	if (expect_false (PL_lex_state != LEX_NOTPARSING))
1320	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version");	1309	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1321	#endif	1310	#endif
1322	}	1311	}
1323	}	1312	}
1324		1313
1325	/* always use the TRANSFER macro */	1314	/* always use the TRANSFER macro */
…		…
1329	dSTACKLEVEL;	1318	dSTACKLEVEL;
1330		1319
1331	/* sometimes transfer is only called to set idle_sp */	1320	/* sometimes transfer is only called to set idle_sp */
1332	if (expect_false (!next))	1321	if (expect_false (!next))
1333	{	1322	{
1334	((coro_cctx *)prev)->idle_sp = STACKLEVEL;	1323	((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1335	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */	1324	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1336	}	1325	}
1337	else if (expect_true (prev != next))	1326	else if (expect_true (prev != next))
1338	{	1327	{
1339	coro_cctx *prev__cctx;	1328	coro_cctx *prev__cctx;
…		…
1346	prev->flags |= CF_RUNNING;	1335	prev->flags |= CF_RUNNING;
1347	}	1336	}
1348		1337
1349	prev->flags &= ~CF_RUNNING;	1338	prev->flags &= ~CF_RUNNING;
1350	next->flags |= CF_RUNNING;	1339	next->flags |= CF_RUNNING;
1351
1352	LOCK;
1353		1340
1354	/* first get rid of the old state */	1341	/* first get rid of the old state */
1355	save_perl (aTHX_ prev);	1342	save_perl (aTHX_ prev);
1356		1343
1357	if (expect_false (next->flags & CF_NEW))	1344	if (expect_false (next->flags & CF_NEW))
…		…
1366		1353
1367	prev__cctx = prev->cctx;	1354	prev__cctx = prev->cctx;
1368		1355
1369	/* possibly untie and reuse the cctx */	1356	/* possibly untie and reuse the cctx */
1370	if (expect_true (	1357	if (expect_true (
1371	prev__cctx->idle_sp == STACKLEVEL	1358	prev__cctx->idle_sp == (void *)stacklevel
1372	&& !(prev__cctx->flags & CC_TRACE)	1359	&& !(prev__cctx->flags & CC_TRACE)
1373	&& !force_cctx	1360	&& !force_cctx
1374	))	1361	))
1375	{	1362	{
1376	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */	1363	/* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1377	assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));	1364	assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));
1378		1365
1379	prev->cctx = 0;	1366	prev->cctx = 0;
1380		1367
1381	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */	1368	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
…		…
1415	coro_state_destroy (pTHX_ struct coro *coro)	1402	coro_state_destroy (pTHX_ struct coro *coro)
1416	{	1403	{
1417	if (coro->flags & CF_DESTROYED)	1404	if (coro->flags & CF_DESTROYED)
1418	return 0;	1405	return 0;
1419		1406
		1407	if (coro->on_destroy)
		1408	coro->on_destroy (aTHX_ coro);
		1409
1420	coro->flags |= CF_DESTROYED;	1410	coro->flags |= CF_DESTROYED;
1421		1411
1422	if (coro->flags & CF_READY)	1412	if (coro->flags & CF_READY)
1423	{	1413	{
1424	/* reduce nready, as destroying a ready coro effectively unreadies it */	1414	/* reduce nready, as destroying a ready coro effectively unreadies it */
1425	/* alternative: look through all ready queues and remove the coro */	1415	/* alternative: look through all ready queues and remove the coro */
1426	LOCK;
1427	--coro_nready;	1416	--coro_nready;
1428	UNLOCK;
1429	}	1417	}
1430	else	1418	else
1431	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */	1419	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1432		1420
1433	if (coro->mainstack && coro->mainstack != main_mainstack)	1421	if (coro->mainstack && coro->mainstack != main_mainstack)
1434	{	1422	{
1435	struct coro temp;	1423	struct coro temp;
1436		1424
1437	if (coro->flags & CF_RUNNING)	1425	assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1438	croak ("FATAL: tried to destroy currently running coroutine");
1439		1426
1440	save_perl (aTHX_ &temp);	1427	save_perl (aTHX_ &temp);
1441	load_perl (aTHX_ coro);	1428	load_perl (aTHX_ coro);
1442		1429
1443	coro_destruct (aTHX_ coro);	1430	coro_destruct (aTHX_ coro);
…		…
1494	# define MGf_DUP 0	1481	# define MGf_DUP 0
1495	#endif	1482	#endif
1496	};	1483	};
1497		1484
1498	static void	1485	static void
1499	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)	1486	prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1500	{	1487	{
1501	ta->prev = SvSTATE (prev_sv);	1488	ta->prev = SvSTATE (prev_sv);
1502	ta->next = SvSTATE (next_sv);	1489	ta->next = SvSTATE (next_sv);
1503	TRANSFER_CHECK (*ta);	1490	TRANSFER_CHECK (*ta);
1504	}	1491	}
1505		1492
1506	static void	1493	static void
1507	api_transfer (SV *prev_sv, SV *next_sv)	1494	api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1508	{	1495	{
1509	dTHX;
1510	struct transfer_args ta;	1496	struct coro_transfer_args ta;
1511		1497
1512	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);	1498	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1513	TRANSFER (ta, 1);	1499	TRANSFER (ta, 1);
1514	}	1500	}
1515		1501
1516	/** Coro ********************************************************************/	1502	/** Coro ********************************************************************/
1517		1503
1518	static void	1504	INLINE void
1519	coro_enq (pTHX_ SV *coro_sv)	1505	coro_enq (pTHX_ struct coro *coro)
1520	{	1506	{
1521	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);	1507	av_push (coro_ready [coro->prio - PRIO_MIN], SvREFCNT_inc_NN (coro->hv));
1522	}	1508	}
1523		1509
1524	static SV *	1510	INLINE SV *
1525	coro_deq (pTHX)	1511	coro_deq (pTHX)
1526	{	1512	{
1527	int prio;	1513	int prio;
1528		1514
1529	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )	1515	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
…		…
1532		1518
1533	return 0;	1519	return 0;
1534	}	1520	}
1535		1521
1536	static int	1522	static int
1537	api_ready (SV *coro_sv)	1523	api_ready (pTHX_ SV *coro_sv)
1538	{	1524	{
1539	dTHX;
1540	struct coro *coro;	1525	struct coro *coro;
1541	SV *sv_hook;	1526	SV *sv_hook;
1542	void (*xs_hook)(void);	1527	void (*xs_hook)(void);
1543		1528
1544	if (SvROK (coro_sv))	1529	if (SvROK (coro_sv))
…		…
1549	if (coro->flags & CF_READY)	1534	if (coro->flags & CF_READY)
1550	return 0;	1535	return 0;
1551		1536
1552	coro->flags |= CF_READY;	1537	coro->flags |= CF_READY;
1553		1538
1554	LOCK;
1555
1556	sv_hook = coro_nready ? 0 : coro_readyhook;	1539	sv_hook = coro_nready ? 0 : coro_readyhook;
1557	xs_hook = coro_nready ? 0 : coroapi.readyhook;	1540	xs_hook = coro_nready ? 0 : coroapi.readyhook;
1558		1541
1559	coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv));	1542	coro_enq (aTHX_ coro);
1560	++coro_nready;	1543	++coro_nready;
1561		1544
1562	UNLOCK;
1563
1564	if (sv_hook)	1545	if (sv_hook)
1565	{	1546	{
1566	dSP;	1547	dSP;
1567		1548
1568	ENTER;	1549	ENTER;
…		…
1582		1563
1583	return 1;	1564	return 1;
1584	}	1565	}
1585		1566
1586	static int	1567	static int
1587	api_is_ready (SV *coro_sv)	1568	api_is_ready (pTHX_ SV *coro_sv)
1588	{	1569	{
1589	dTHX;
1590
1591	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1570	return !!(SvSTATE (coro_sv)->flags & CF_READY);
1592	}	1571	}
1593		1572
1594	INLINE void	1573	INLINE void
1595	prepare_schedule (pTHX_ struct transfer_args *ta)	1574	prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1596	{	1575	{
1597	SV *prev_sv, *next_sv;	1576	SV *prev_sv, *next_sv;
1598		1577
1599	for (;;)	1578	for (;;)
1600	{	1579	{
1601	LOCK;
1602	next_sv = coro_deq (aTHX);	1580	next_sv = coro_deq (aTHX);
1603		1581
1604	/* nothing to schedule: call the idle handler */	1582	/* nothing to schedule: call the idle handler */
1605	if (expect_false (!next_sv))	1583	if (expect_false (!next_sv))
1606	{	1584	{
1607	dSP;	1585	dSP;
1608	UNLOCK;
1609		1586
1610	ENTER;	1587	ENTER;
1611	SAVETMPS;	1588	SAVETMPS;
1612		1589
1613	PUSHMARK (SP);	1590	PUSHMARK (SP);
…		…
1618	FREETMPS;	1595	FREETMPS;
1619	LEAVE;	1596	LEAVE;
1620	continue;	1597	continue;
1621	}	1598	}
1622		1599
1623	ta->next = SvSTATE (next_sv);	1600	ta->next = SvSTATE_hv (next_sv);
1624		1601
1625	/* cannot transfer to destroyed coros, skip and look for next */	1602	/* cannot transfer to destroyed coros, skip and look for next */
1626	if (expect_false (ta->next->flags & CF_DESTROYED))	1603	if (expect_false (ta->next->flags & CF_DESTROYED))
1627	{	1604	{
1628	UNLOCK;
1629	SvREFCNT_dec (next_sv);	1605	SvREFCNT_dec (next_sv);
1630	/* coro_nready has already been taken care of by destroy */	1606	/* coro_nready has already been taken care of by destroy */
1631	continue;	1607	continue;
1632	}	1608	}
1633		1609
1634	--coro_nready;	1610	--coro_nready;
1635	UNLOCK;
1636	break;	1611	break;
1637	}	1612	}
1638		1613
1639	/* free this only after the transfer */	1614	/* free this only after the transfer */
1640	prev_sv = SvRV (coro_current);	1615	prev_sv = SvRV (coro_current);
1641	ta->prev = SvSTATE (prev_sv);	1616	ta->prev = SvSTATE_hv (prev_sv);
1642	TRANSFER_CHECK (*ta);	1617	TRANSFER_CHECK (*ta);
1643	assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));	1618	assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1644	ta->next->flags &= ~CF_READY;	1619	ta->next->flags &= ~CF_READY;
1645	SvRV_set (coro_current, next_sv);	1620	SvRV_set (coro_current, next_sv);
1646		1621
1647	LOCK;
1648	free_coro_mortal (aTHX);	1622	free_coro_mortal (aTHX);
1649	coro_mortal = prev_sv;	1623	coro_mortal = prev_sv;
1650	UNLOCK;
1651	}	1624	}
1652		1625
1653	INLINE void	1626	INLINE void
1654	prepare_cede (pTHX_ struct transfer_args *ta)	1627	prepare_cede (pTHX_ struct coro_transfer_args *ta)
1655	{	1628	{
1656	api_ready (coro_current);	1629	api_ready (aTHX_ coro_current);
1657	prepare_schedule (aTHX_ ta);	1630	prepare_schedule (aTHX_ ta);
1658	}	1631	}
1659		1632
1660	static void	1633	INLINE void
1661	prepare_cede_notself (pTHX_ struct transfer_args *ta)	1634	prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1662	{	1635	{
1663	SV *prev = SvRV (coro_current);	1636	SV *prev = SvRV (coro_current);
1664		1637
1665	if (coro_nready)	1638	if (coro_nready)
1666	{	1639	{
1667	prepare_schedule (aTHX_ ta);	1640	prepare_schedule (aTHX_ ta);
1668	api_ready (prev);	1641	api_ready (aTHX_ prev);
1669	}	1642	}
1670	else	1643	else
1671	ta->prev = ta->next = SvSTATE (prev);	1644	prepare_nop (aTHX_ ta);
1672	}	1645	}
1673		1646
1674	static void	1647	static void
1675	api_schedule (void)	1648	api_schedule (pTHX)
1676	{	1649	{
1677	dTHX;
1678	struct transfer_args ta;	1650	struct coro_transfer_args ta;
1679		1651
1680	prepare_schedule (aTHX_ &ta);	1652	prepare_schedule (aTHX_ &ta);
1681	TRANSFER (ta, 1);	1653	TRANSFER (ta, 1);
1682	}	1654	}
1683		1655
1684	static int	1656	static int
1685	api_cede (void)	1657	api_cede (pTHX)
1686	{	1658	{
1687	dTHX;
1688	struct transfer_args ta;	1659	struct coro_transfer_args ta;
1689		1660
1690	prepare_cede (aTHX_ &ta);	1661	prepare_cede (aTHX_ &ta);
1691		1662
1692	if (expect_true (ta.prev != ta.next))	1663	if (expect_true (ta.prev != ta.next))
1693	{	1664	{
…		…
1697	else	1668	else
1698	return 0;	1669	return 0;
1699	}	1670	}
1700		1671
1701	static int	1672	static int
1702	api_cede_notself (void)	1673	api_cede_notself (pTHX)
1703	{	1674	{
1704	if (coro_nready)	1675	if (coro_nready)
1705	{	1676	{
1706	dTHX;
1707	struct transfer_args ta;	1677	struct coro_transfer_args ta;
1708		1678
1709	prepare_cede_notself (aTHX_ &ta);	1679	prepare_cede_notself (aTHX_ &ta);
1710	TRANSFER (ta, 1);	1680	TRANSFER (ta, 1);
1711	return 1;	1681	return 1;
1712	}	1682	}
1713	else	1683	else
1714	return 0;	1684	return 0;
1715	}	1685	}
1716		1686
1717	static void	1687	static void
1718	api_trace (SV *coro_sv, int flags)	1688	api_trace (pTHX_ SV *coro_sv, int flags)
1719	{	1689	{
1720	dTHX;
1721	struct coro *coro = SvSTATE (coro_sv);	1690	struct coro *coro = SvSTATE (coro_sv);
1722		1691
1723	if (flags & CC_TRACE)	1692	if (flags & CC_TRACE)
1724	{	1693	{
1725	if (!coro->cctx)	1694	if (!coro->cctx)
1726	coro->cctx = cctx_new_run ();	1695	coro->cctx = cctx_new_run ();
1727	else if (!(coro->cctx->flags & CC_TRACE))	1696	else if (!(coro->cctx->flags & CC_TRACE))
1728	croak ("cannot enable tracing on coroutine with custom stack");	1697	croak ("cannot enable tracing on coroutine with custom stack,");
1729		1698
1730	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));	1699	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1731	}	1700	}
1732	else if (coro->cctx && coro->cctx->flags & CC_TRACE)	1701	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1733	{	1702	{
…		…
1738	else	1707	else
1739	coro->slot->runops = RUNOPS_DEFAULT;	1708	coro->slot->runops = RUNOPS_DEFAULT;
1740	}	1709	}
1741	}	1710	}
1742		1711
1743	#if 0
1744	static int
1745	coro_gensub_free (pTHX_ SV *sv, MAGIC *mg)
1746	{
1747	AV *padlist;
1748	AV *av = (AV *)mg->mg_obj;
1749
1750	abort ();
1751
1752	return 0;
1753	}
1754
1755	static MGVTBL coro_gensub_vtbl = {
1756	0, 0, 0, 0,
1757	coro_gensub_free
1758	};
1759	#endif
1760
1761	/*****************************************************************************/	1712	/*****************************************************************************/
1762	/* PerlIO::cede */	1713	/* PerlIO::cede */
1763		1714
1764	typedef struct	1715	typedef struct
1765	{	1716	{
…		…
1792	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);	1743	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1793	double now = nvtime ();	1744	double now = nvtime ();
1794		1745
1795	if (now >= self->next)	1746	if (now >= self->next)
1796	{	1747	{
1797	api_cede ();	1748	api_cede (aTHX);
1798	self->next = now + self->every;	1749	self->next = now + self->every;
1799	}	1750	}
1800		1751
1801	return PerlIOBuf_flush (aTHX_ f);	1752	return PerlIOBuf_flush (aTHX_ f);
1802	}	1753	}
…		…
1833	PerlIOBuf_set_ptrcnt,	1784	PerlIOBuf_set_ptrcnt,
1834	};	1785	};
1835		1786
1836	/*****************************************************************************/	1787	/*****************************************************************************/
1837		1788
1838	static const CV *ssl_cv; /* for quick consistency check */	1789	static const CV *slf_cv; /* for quick consistency check */
1839		1790
1840	static UNOP ssl_restore; /* restore stack as entersub did, for first-re-run */	1791	static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
1841	static SV *ssl_arg0;	1792	static SV *slf_arg0;
1842	static SV *ssl_arg1;	1793	static SV *slf_arg1;
		1794	static SV *slf_arg2;
1843		1795
1844	/* this restores the stack in the case we patched the entersub, to */	1796	/* this restores the stack in the case we patched the entersub, to */
1845	/* recreate the stack frame as perl will on following calls */	1797	/* recreate the stack frame as perl will on following calls */
1846	/* since entersub cleared the stack */	1798	/* since entersub cleared the stack */
1847	static OP *	1799	static OP *
…		…
1850	dSP;	1802	dSP;
1851		1803
1852	PUSHMARK (SP);	1804	PUSHMARK (SP);
1853		1805
1854	EXTEND (SP, 3);	1806	EXTEND (SP, 3);
1855	if (ssl_arg0) PUSHs (sv_2mortal (ssl_arg0)), ssl_arg0 = 0;	1807	if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));
1856	if (ssl_arg1) PUSHs (sv_2mortal (ssl_arg1)), ssl_arg1 = 0;	1808	if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));
		1809	if (slf_arg2) PUSHs (sv_2mortal (slf_arg2));
1857	PUSHs ((SV *)CvGV (ssl_cv));	1810	PUSHs ((SV *)CvGV (slf_cv));
1858		1811
1859	RETURNOP (ssl_restore.op_first);	1812	RETURNOP (slf_restore.op_first);
1860	}	1813	}
1861		1814
1862	#define OPpENTERSUB_SSL 15 /* the part of op_private entersub hopefully doesn't use */	1815	static void
		1816	slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
		1817	{
		1818	prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
		1819	}
1863		1820
1864	/* declare prototype */	1821	static void
1865	XS(XS_Coro__State__set_stacklevel);	1822	slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		1823	{
		1824	assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
		1825
		1826	frame->prepare = slf_prepare_set_stacklevel;
		1827	frame->check = slf_check_nop;
		1828	frame->data = (void *)SvIV (arg [0]);
		1829	}
		1830
		1831	static void
		1832	slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
		1833	{
		1834	SV **arg = (SV **)slf_frame.data;
		1835
		1836	prepare_transfer (aTHX_ ta, arg [0], arg [1]);
		1837	}
		1838
		1839	static void
		1840	slf_init_transfer (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		1841	{
		1842	if (items != 2)
		1843	croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
		1844
		1845	frame->prepare = slf_prepare_transfer;
		1846	frame->check = slf_check_nop;
		1847	frame->data = (void *)arg; /* let's hope it will stay valid */
		1848	}
		1849
		1850	static void
		1851	slf_init_schedule (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		1852	{
		1853	frame->prepare = prepare_schedule;
		1854	frame->check = slf_check_nop;
		1855	}
		1856
		1857	static void
		1858	slf_init_cede (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		1859	{
		1860	frame->prepare = prepare_cede;
		1861	frame->check = slf_check_nop;
		1862	}
		1863
		1864	static void
		1865	slf_init_cede_notself (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		1866	{
		1867	frame->prepare = prepare_cede_notself;
		1868	frame->check = slf_check_nop;
		1869	}
		1870
		1871	/* we hijack an hopefully unused CV flag for our purposes */
		1872	#define CVf_SLF 0x4000
1866		1873
1867	/*	1874	/*
1868	* these not obviously related functions are all rolled into one	1875	* these not obviously related functions are all rolled into one
1869	* function to increase chances that they all will call transfer with the same	1876	* function to increase chances that they all will call transfer with the same
1870	* stack offset	1877	* stack offset
		1878	* SLF stands for "schedule-like-function".
1871	*/	1879	*/
1872	static OP *	1880	static OP *
1873	pp_set_stacklevel (pTHX)	1881	pp_slf (pTHX)
1874	{	1882	{
		1883	I32 checkmark; /* mark SP to see how many elements check has pushed */
		1884
		1885	/* set up the slf frame, unless it has already been set-up */
		1886	/* the latter happens when a new coro has been started */
		1887	/* or when a new cctx was attached to an existing coroutine */
		1888	if (expect_true (!slf_frame.prepare))
		1889	{
		1890	/* first iteration */
1875	dSP;	1891	dSP;
1876	struct transfer_args ta;
1877	SV **arg = PL_stack_base + TOPMARK + 1;	1892	SV **arg = PL_stack_base + TOPMARK + 1;
1878	int items = SP - arg; /* args without function object */	1893	int items = SP - arg; /* args without function object */
		1894	SV *gv = *sp;
1879		1895
1880	/* do a quick consistency check on the "function" object, and if it isn't */	1896	/* do a quick consistency check on the "function" object, and if it isn't */
1881	/* for us, divert to the real entersub */	1897	/* for us, divert to the real entersub */
1882	if (SvTYPE (*sp) != SVt_PVGV || CvXSUB (GvCV (*sp)) != XS_Coro__State__set_stacklevel)	1898	if (SvTYPE (gv) != SVt_PVGV || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
1883	return PL_ppaddr[OP_ENTERSUB](aTHX);	1899	return PL_ppaddr[OP_ENTERSUB](aTHX);
1884		1900
1885	/* pop args */	1901	/* pop args */
1886	SP = PL_stack_base + POPMARK;	1902	SP = PL_stack_base + POPMARK;
1887		1903
1888	if (!(PL_op->op_flags & OPf_STACKED))	1904	if (!(PL_op->op_flags & OPf_STACKED))
1889	{	1905	{
1890	/* ampersand-form of call, use @_ instead of stack */	1906	/* ampersand-form of call, use @_ instead of stack */
1891	AV *av = GvAV (PL_defgv);	1907	AV *av = GvAV (PL_defgv);
1892	arg = AvARRAY (av);	1908	arg = AvARRAY (av);
1893	items = AvFILLp (av) + 1;	1909	items = AvFILLp (av) + 1;
		1910	}
		1911
		1912	PUTBACK;
		1913
		1914	/* now call the init function, which needs to set up slf_frame */
		1915	((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr)
		1916	(aTHX_ &slf_frame, GvCV (gv), arg, items);
		1917	}
		1918
		1919	/* now that we have a slf_frame, interpret it! */
		1920	/* we use a callback system not to make the code needlessly */
		1921	/* complicated, but so we can run multiple perl coros from one cctx */
		1922
		1923	do
		1924	{
		1925	struct coro_transfer_args ta;
		1926
		1927	slf_frame.prepare (aTHX_ &ta);
		1928	TRANSFER (ta, 0);
		1929
		1930	checkmark = PL_stack_sp - PL_stack_base;
		1931	}
		1932	while (slf_frame.check (aTHX_ &slf_frame));
		1933
		1934	{
		1935	dSP;
		1936	SV **bot = PL_stack_base + checkmark;
		1937	int gimme = GIMME_V;
		1938
		1939	slf_frame.prepare = 0; /* invalidate the frame, so it gets initialised again next time */
		1940
		1941	/* make sure we put something on the stack in scalar context */
		1942	if (gimme == G_SCALAR)
		1943	{
		1944	if (sp == bot)
		1945	XPUSHs (&PL_sv_undef);
		1946
		1947	SP = bot + 1;
1894	}	1948	}
1895		1949
1896	PUTBACK;	1950	PUTBACK;
1897	switch (PL_op->op_private & OPpENTERSUB_SSL)
1898	{
1899	case 0:
1900	prepare_set_stacklevel (&ta, (struct coro_cctx *)SvIV (arg [0]));
1901	break;
1902
1903	case 1:
1904	if (items != 2)
1905	croak ("Coro::State::transfer (prev, next) expects two arguments, not %d.", items);
1906
1907	prepare_transfer (aTHX_ &ta, arg [0], arg [1]);
1908	break;
1909
1910	case 2:
1911	prepare_schedule (aTHX_ &ta);
1912	break;
1913
1914	case 3:
1915	prepare_cede (aTHX_ &ta);
1916	break;
1917
1918	case 4:
1919	prepare_cede_notself (aTHX_ &ta);
1920	break;
1921	}	1951	}
1922		1952
1923	TRANSFER (ta, 0);	1953	return NORMAL;
1924	SPAGAIN;
1925
1926	skip:
1927	PUTBACK;
1928	SSL_TAIL;
1929	SPAGAIN;
1930	RETURN;
1931	}	1954	}
1932		1955
1933	static void	1956	static void
1934	coro_ssl_patch (pTHX_ CV *cv, int ix, SV **args, int items)	1957	api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, SV **arg, int items)
1935	{	1958	{
1936	assert (("FATAL: ssl call recursion in Coro module (please report)", PL_op->op_ppaddr != pp_set_stacklevel));
1937
1938	assert (("FATAL: ssl call with illegal CV value", CvGV (cv)));	1959	assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
		1960
		1961	if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
		1962	&& PL_op->op_ppaddr != pp_slf)
		1963	croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
		1964
		1965	if (items > 3)
		1966	croak ("Coro only supports up to three arguments to SLF functions currently (not %d), caught", items);
		1967
		1968	CvFLAGS (cv) |= CVf_SLF;
		1969	CvXSUBANY (cv).any_ptr = (void *)init_cb;
1939	ssl_cv = cv;	1970	slf_cv = cv;
1940		1971
1941	/* we patch the op, and then re-run the whole call */	1972	/* we patch the op, and then re-run the whole call */
1942	/* we have to put some dummy argument on the stack for this to work */	1973	/* we have to put the same argument on the stack for this to work */
		1974	/* and this will be done by pp_restore */
1943	ssl_restore.op_next = (OP *)&ssl_restore;	1975	slf_restore.op_next = (OP *)&slf_restore;
1944	ssl_restore.op_type = OP_NULL;	1976	slf_restore.op_type = OP_CUSTOM;
1945	ssl_restore.op_ppaddr = pp_restore;	1977	slf_restore.op_ppaddr = pp_restore;
1946	ssl_restore.op_first = PL_op;	1978	slf_restore.op_first = PL_op;
1947		1979
1948	ssl_arg0 = items > 0 ? SvREFCNT_inc (args [0]) : 0;	1980	slf_arg0 = items > 0 ? SvREFCNT_inc (arg [0]) : 0;
1949	ssl_arg1 = items > 1 ? SvREFCNT_inc (args [1]) : 0;	1981	slf_arg1 = items > 1 ? SvREFCNT_inc (arg [1]) : 0;
		1982	slf_arg2 = items > 2 ? SvREFCNT_inc (arg [2]) : 0;
1950		1983
1951	PL_op->op_ppaddr = pp_set_stacklevel;	1984	PL_op->op_ppaddr = pp_slf;
1952	PL_op->op_private = PL_op->op_private & ~OPpENTERSUB_SSL | ix; /* we potentially share our private flags with entersub */
1953		1985
1954	PL_op = (OP *)&ssl_restore;	1986	PL_op = (OP *)&slf_restore;
1955	}	1987	}
		1988
		1989	/*****************************************************************************/
		1990
		1991	static void
		1992	coro_semaphore_adjust (pTHX_ AV *av, int adjust)
		1993	{
		1994	SV *count_sv = AvARRAY (av)[0];
		1995	IV count = SvIVX (count_sv);
		1996
		1997	count += adjust;
		1998	SvIVX (count_sv) = count;
		1999
		2000	/* now wake up as many waiters as possible */
		2001	while (count > 0 && AvFILLp (av) >= count)
		2002	{
		2003	SV *cb;
		2004
		2005	/* swap first two elements so we can shift a waiter */
		2006	AvARRAY (av)[0] = AvARRAY (av)[1];
		2007	AvARRAY (av)[1] = count_sv;
		2008	cb = av_shift (av);
		2009
		2010	if (SvOBJECT (cb))
		2011	api_ready (aTHX_ cb);
		2012	else
		2013	croak ("callbacks not yet supported");
		2014
		2015	SvREFCNT_dec (cb);
		2016
		2017	--count;
		2018	}
		2019	}
		2020
		2021	static void
		2022	coro_semaphore_on_destroy (pTHX_ struct coro *coro)
		2023	{
		2024	/* call $sem->adjust (0) to possibly wake up some waiters */
		2025	coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
		2026	}
		2027
		2028	static int
		2029	slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
		2030	{
		2031	AV *av = (AV *)frame->data;
		2032	SV *count_sv = AvARRAY (av)[0];
		2033
		2034	if (SvIVX (count_sv) > 0)
		2035	{
		2036	SvSTATE_current->on_destroy = 0;
		2037	SvIVX (count_sv) = SvIVX (count_sv) - 1;
		2038	return 0;
		2039	}
		2040	else
		2041	{
		2042	int i;
		2043	/* if we were woken up but can't down, we look through the whole */
		2044	/* waiters list and only add us if we aren't in there already */
		2045	/* this avoids some degenerate memory usage cases */
		2046
		2047	for (i = 1; i <= AvFILLp (av); ++i)
		2048	if (AvARRAY (av)[i] == SvRV (coro_current))
		2049	return 1;
		2050
		2051	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2052	return 1;
		2053	}
		2054	}
		2055
		2056	static void
		2057	slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
		2058	{
		2059	AV *av = (AV *)SvRV (arg [0]);
		2060
		2061	if (SvIVX (AvARRAY (av)[0]) > 0)
		2062	{
		2063	frame->data = (void *)av;
		2064	frame->prepare = prepare_nop;
		2065	}
		2066	else
		2067	{
		2068	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2069
		2070	frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
		2071	frame->prepare = prepare_schedule;
		2072
		2073	/* to avoid race conditions when a woken-up coro gets terminated */
		2074	/* we arrange for a temporary on_destroy that calls adjust (0) */
		2075	SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
		2076	}
		2077
		2078	frame->check = slf_check_semaphore_down;
		2079
		2080	}
		2081
		2082	/*****************************************************************************/
		2083
		2084	#define GENSUB_ARG CvXSUBANY (cv).any_ptr
		2085
		2086	/* create a closure from XS, returns a code reference */
		2087	/* the arg can be accessed via GENSUB_ARG from the callback */
		2088	/* the callback must use dXSARGS/XSRETURN */
		2089	static SV *
		2090	gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
		2091	{
		2092	CV *cv = (CV *)NEWSV (0, 0);
		2093
		2094	sv_upgrade ((SV *)cv, SVt_PVCV);
		2095
		2096	CvANON_on (cv);
		2097	CvISXSUB_on (cv);
		2098	CvXSUB (cv) = xsub;
		2099	GENSUB_ARG = arg;
		2100
		2101	return newRV_noinc ((SV *)cv);
		2102	}
		2103
		2104	/*****************************************************************************/
1956		2105
1957	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_	2106	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1958		2107
1959	PROTOTYPES: DISABLE	2108	PROTOTYPES: DISABLE
1960		2109
1961	BOOT:	2110	BOOT:
1962	{	2111	{
1963	#ifdef USE_ITHREADS	2112	#ifdef USE_ITHREADS
1964	MUTEX_INIT (&coro_lock);
1965	# if CORO_PTHREAD	2113	# if CORO_PTHREAD
1966	coro_thx = PERL_GET_CONTEXT;	2114	coro_thx = PERL_GET_CONTEXT;
1967	# endif	2115	# endif
1968	#endif	2116	#endif
1969	BOOT_PAGESIZE;	2117	BOOT_PAGESIZE;
…		…
1990	main_top_env = PL_top_env;	2138	main_top_env = PL_top_env;
1991		2139
1992	while (main_top_env->je_prev)	2140	while (main_top_env->je_prev)
1993	main_top_env = main_top_env->je_prev;	2141	main_top_env = main_top_env->je_prev;
1994		2142
		2143	{
		2144	SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
		2145
		2146	if (!PL_custom_op_names) PL_custom_op_names = newHV ();
		2147	hv_store_ent (PL_custom_op_names, slf,
		2148	newSVpv ("coro_slf", 0), 0);
		2149
		2150	if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
		2151	hv_store_ent (PL_custom_op_descs, slf,
		2152	newSVpv ("coro schedule like function", 0), 0);
		2153	}
		2154
1995	coroapi.ver = CORO_API_VERSION;	2155	coroapi.ver = CORO_API_VERSION;
1996	coroapi.rev = CORO_API_REVISION;	2156	coroapi.rev = CORO_API_REVISION;
		2157
1997	coroapi.transfer = api_transfer;	2158	coroapi.transfer = api_transfer;
		2159
		2160	coroapi.sv_state = SvSTATE_;
		2161	coroapi.execute_slf = api_execute_slf;
		2162	coroapi.prepare_nop = prepare_nop;
		2163	coroapi.prepare_schedule = prepare_schedule;
		2164	coroapi.prepare_cede = prepare_cede;
		2165	coroapi.prepare_cede_notself = prepare_cede_notself;
1998		2166
1999	{	2167	{
2000	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);	2168	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2001		2169
2002	if (!svp) croak ("Time::HiRes is required");	2170	if (!svp) croak ("Time::HiRes is required");
…		…
2037	OUTPUT:	2205	OUTPUT:
2038	RETVAL	2206	RETVAL
2039		2207
2040	void	2208	void
2041	_set_stacklevel (...)	2209	_set_stacklevel (...)
2042	ALIAS:	2210	CODE:
2043	Coro::State::transfer = 1	2211	api_execute_slf (aTHX_ cv, slf_init_set_stacklevel, &ST (0), items);
2044	Coro::schedule = 2	2212
2045	Coro::cede = 3	2213	void
2046	Coro::cede_notself = 4	2214	transfer (...)
2047	CODE:	2215	PROTOTYPE: $$
2048	coro_ssl_patch (aTHX_ cv, ix, &ST (0), items);	2216	CODE:
		2217	api_execute_slf (aTHX_ cv, slf_init_transfer, &ST (0), items);
2049		2218
2050	bool	2219	bool
2051	_destroy (SV *coro_sv)	2220	_destroy (SV *coro_sv)
2052	CODE:	2221	CODE:
2053	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));	2222	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
…		…
2060	CODE:	2229	CODE:
2061	_exit (code);	2230	_exit (code);
2062		2231
2063	int	2232	int
2064	cctx_stacksize (int new_stacksize = 0)	2233	cctx_stacksize (int new_stacksize = 0)
		2234	PROTOTYPE: ;$
2065	CODE:	2235	CODE:
2066	RETVAL = cctx_stacksize;	2236	RETVAL = cctx_stacksize;
2067	if (new_stacksize)	2237	if (new_stacksize)
2068	{	2238	{
2069	cctx_stacksize = new_stacksize;	2239	cctx_stacksize = new_stacksize;
…		…
2072	OUTPUT:	2242	OUTPUT:
2073	RETVAL	2243	RETVAL
2074		2244
2075	int	2245	int
2076	cctx_max_idle (int max_idle = 0)	2246	cctx_max_idle (int max_idle = 0)
		2247	PROTOTYPE: ;$
2077	CODE:	2248	CODE:
2078	RETVAL = cctx_max_idle;	2249	RETVAL = cctx_max_idle;
2079	if (max_idle > 1)	2250	if (max_idle > 1)
2080	cctx_max_idle = max_idle;	2251	cctx_max_idle = max_idle;
2081	OUTPUT:	2252	OUTPUT:
2082	RETVAL	2253	RETVAL
2083		2254
2084	int	2255	int
2085	cctx_count ()	2256	cctx_count ()
		2257	PROTOTYPE:
2086	CODE:	2258	CODE:
2087	RETVAL = cctx_count;	2259	RETVAL = cctx_count;
2088	OUTPUT:	2260	OUTPUT:
2089	RETVAL	2261	RETVAL
2090		2262
2091	int	2263	int
2092	cctx_idle ()	2264	cctx_idle ()
		2265	PROTOTYPE:
2093	CODE:	2266	CODE:
2094	RETVAL = cctx_idle;	2267	RETVAL = cctx_idle;
2095	OUTPUT:	2268	OUTPUT:
2096	RETVAL	2269	RETVAL
2097		2270
2098	void	2271	void
2099	list ()	2272	list ()
		2273	PROTOTYPE:
2100	PPCODE:	2274	PPCODE:
2101	{	2275	{
2102	struct coro *coro;	2276	struct coro *coro;
2103	for (coro = coro_first; coro; coro = coro->next)	2277	for (coro = coro_first; coro; coro = coro->next)
2104	if (coro->hv)	2278	if (coro->hv)
…		…
2171	SvREFCNT_dec (self->throw);	2345	SvREFCNT_dec (self->throw);
2172	self->throw = SvOK (throw) ? newSVsv (throw) : 0;	2346	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
2173		2347
2174	void	2348	void
2175	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)	2349	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		2350	PROTOTYPE: $;$
		2351	C_ARGS: aTHX_ coro, flags
2176		2352
2177	SV *	2353	SV *
2178	has_cctx (Coro::State coro)	2354	has_cctx (Coro::State coro)
2179	PROTOTYPE: $	2355	PROTOTYPE: $
2180	CODE:	2356	CODE:
…		…
2204	OUTPUT:	2380	OUTPUT:
2205	RETVAL	2381	RETVAL
2206		2382
2207	void	2383	void
2208	force_cctx ()	2384	force_cctx ()
		2385	PROTOTYPE:
2209	CODE:	2386	CODE:
2210	struct coro *coro = SvSTATE (coro_current);
2211	coro->cctx->idle_sp = 0;	2387	SvSTATE_current->cctx->idle_sp = 0;
2212		2388
2213	void	2389	void
2214	swap_defsv (Coro::State self)	2390	swap_defsv (Coro::State self)
2215	PROTOTYPE: $	2391	PROTOTYPE: $
2216	ALIAS:	2392	ALIAS:
2217	swap_defav = 1	2393	swap_defav = 1
2218	CODE:	2394	CODE:
2219	if (!self->slot)	2395	if (!self->slot)
2220	croak ("cannot swap state with coroutine that has no saved state");	2396	croak ("cannot swap state with coroutine that has no saved state,");
2221	else	2397	else
2222	{	2398	{
2223	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);	2399	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2224	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;	2400	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
2225		2401
…		…
2257	coroapi.schedule = api_schedule;	2433	coroapi.schedule = api_schedule;
2258	coroapi.cede = api_cede;	2434	coroapi.cede = api_cede;
2259	coroapi.cede_notself = api_cede_notself;	2435	coroapi.cede_notself = api_cede_notself;
2260	coroapi.ready = api_ready;	2436	coroapi.ready = api_ready;
2261	coroapi.is_ready = api_is_ready;	2437	coroapi.is_ready = api_is_ready;
2262	coroapi.nready = &coro_nready;	2438	coroapi.nready = coro_nready;
2263	coroapi.current = coro_current;	2439	coroapi.current = coro_current;
2264		2440
2265	GCoroAPI = &coroapi;	2441	GCoroAPI = &coroapi;
2266	sv_setiv (sv, (IV)&coroapi);	2442	sv_setiv (sv, (IV)&coroapi);
2267	SvREADONLY_on (sv);	2443	SvREADONLY_on (sv);
2268	}	2444	}
2269	}	2445	}
		2446
		2447	void
		2448	schedule (...)
		2449	CODE:
		2450	api_execute_slf (aTHX_ cv, slf_init_schedule, &ST (0), 0);
		2451
		2452	void
		2453	cede (...)
		2454	CODE:
		2455	api_execute_slf (aTHX_ cv, slf_init_cede, &ST (0), 0);
		2456
		2457	void
		2458	cede_notself (...)
		2459	CODE:
		2460	api_execute_slf (aTHX_ cv, slf_init_cede_notself, &ST (0), 0);
2270		2461
2271	void	2462	void
2272	_set_current (SV *current)	2463	_set_current (SV *current)
2273	PROTOTYPE: $	2464	PROTOTYPE: $
2274	CODE:	2465	CODE:
…		…
2277		2468
2278	void	2469	void
2279	_set_readyhook (SV *hook)	2470	_set_readyhook (SV *hook)
2280	PROTOTYPE: $	2471	PROTOTYPE: $
2281	CODE:	2472	CODE:
2282	LOCK;
2283	SvREFCNT_dec (coro_readyhook);	2473	SvREFCNT_dec (coro_readyhook);
2284	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;	2474	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2285	UNLOCK;
2286		2475
2287	int	2476	int
2288	prio (Coro::State coro, int newprio = 0)	2477	prio (Coro::State coro, int newprio = 0)
		2478	PROTOTYPE: $;$
2289	ALIAS:	2479	ALIAS:
2290	nice = 1	2480	nice = 1
2291	CODE:	2481	CODE:
2292	{	2482	{
2293	RETVAL = coro->prio;	2483	RETVAL = coro->prio;
…		…
2308		2498
2309	SV *	2499	SV *
2310	ready (SV *self)	2500	ready (SV *self)
2311	PROTOTYPE: $	2501	PROTOTYPE: $
2312	CODE:	2502	CODE:
2313	RETVAL = boolSV (api_ready (self));	2503	RETVAL = boolSV (api_ready (aTHX_ self));
2314	OUTPUT:	2504	OUTPUT:
2315	RETVAL	2505	RETVAL
2316		2506
2317	int	2507	int
2318	nready (...)	2508	nready (...)
…		…
2325	# for async_pool speedup	2515	# for async_pool speedup
2326	void	2516	void
2327	_pool_1 (SV *cb)	2517	_pool_1 (SV *cb)
2328	CODE:	2518	CODE:
2329	{	2519	{
2330	struct coro *coro = SvSTATE (coro_current);
2331	HV *hv = (HV *)SvRV (coro_current);	2520	HV *hv = (HV *)SvRV (coro_current);
		2521	struct coro *coro = SvSTATE_hv ((SV *)hv);
2332	AV *defav = GvAV (PL_defgv);	2522	AV *defav = GvAV (PL_defgv);
2333	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);	2523	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2334	AV *invoke_av;	2524	AV *invoke_av;
2335	int i, len;	2525	int i, len;
2336		2526
…		…
2357	{	2547	{
2358	av_fill (defav, len - 1);	2548	av_fill (defav, len - 1);
2359	for (i = 0; i < len; ++i)	2549	for (i = 0; i < len; ++i)
2360	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));	2550	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2361	}	2551	}
2362
2363	SvREFCNT_dec (invoke);
2364	}	2552	}
2365		2553
2366	void	2554	void
2367	_pool_2 (SV *cb)	2555	_pool_2 (SV *cb)
2368	CODE:	2556	CODE:
2369	{	2557	{
2370	struct coro *coro = SvSTATE (coro_current);	2558	struct coro *coro = SvSTATE_current;
2371		2559
2372	sv_setsv (cb, &PL_sv_undef);	2560	sv_setsv (cb, &PL_sv_undef);
2373		2561
2374	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;	2562	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2375	coro->saved_deffh = 0;	2563	coro->saved_deffh = 0;
…		…
2388	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);	2576	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2389		2577
2390	coro->prio = 0;	2578	coro->prio = 0;
2391		2579
2392	if (coro->cctx && (coro->cctx->flags & CC_TRACE))	2580	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2393	api_trace (coro_current, 0);	2581	api_trace (aTHX_ coro_current, 0);
2394		2582
2395	av_push (av_async_pool, newSVsv (coro_current));	2583	av_push (av_async_pool, newSVsv (coro_current));
2396	}	2584	}
2397
2398	#if 0
2399
2400	void
2401	_generator_call (...)
2402	PROTOTYPE: @
2403	PPCODE:
2404	fprintf (stderr, "call %p\n", CvXSUBANY(cv).any_ptr);
2405	xxxx
2406	abort ();
2407
2408	SV *
2409	gensub (SV *sub, ...)
2410	PROTOTYPE: &;@
2411	CODE:
2412	{
2413	struct coro *coro;
2414	MAGIC *mg;
2415	CV *xcv;
2416	CV *ncv = (CV *)newSV_type (SVt_PVCV);
2417	int i;
2418
2419	CvGV (ncv) = CvGV (cv);
2420	CvFILE (ncv) = CvFILE (cv);
2421
2422	Newz (0, coro, 1, struct coro);
2423	coro->args = newAV ();
2424	coro->flags = CF_NEW;
2425
2426	av_extend (coro->args, items - 1);
2427	for (i = 1; i < items; i++)
2428	av_push (coro->args, newSVsv (ST (i)));
2429
2430	CvISXSUB_on (ncv);
2431	CvXSUBANY (ncv).any_ptr = (void *)coro;
2432
2433	xcv = GvCV (gv_fetchpv ("Coro::_generator_call", 0, SVt_PVCV));
2434
2435	CvXSUB (ncv) = CvXSUB (xcv);
2436	CvANON_on (ncv);
2437
2438	mg = sv_magicext ((SV *)ncv, 0, CORO_MAGIC_type_state, &coro_gensub_vtbl, (char *)coro, 0);
2439	RETVAL = newRV_noinc ((SV *)ncv);
2440	}
2441	OUTPUT:
2442	RETVAL
2443
2444	#endif
2445		2585
2446		2586
2447	MODULE = Coro::State PACKAGE = Coro::AIO	2587	MODULE = Coro::State PACKAGE = Coro::AIO
2448		2588
2449	void	2589	void
2450	_get_state (SV *self)	2590	_get_state (SV *self)
		2591	PROTOTYPE: $
2451	PPCODE:	2592	PPCODE:
2452	{	2593	{
2453	AV *defav = GvAV (PL_defgv);	2594	AV *defav = GvAV (PL_defgv);
2454	AV *av = newAV ();	2595	AV *av = newAV ();
2455	int i;	2596	int i;
…		…
2470		2611
2471	av_push (av, data_sv);	2612	av_push (av, data_sv);
2472		2613
2473	XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));	2614	XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
2474		2615
2475	api_ready (self);	2616	api_ready (aTHX_ self);
2476	}	2617	}
2477		2618
2478	void	2619	void
2479	_set_state (SV *state)	2620	_set_state (SV *state)
2480	PROTOTYPE: $	2621	PROTOTYPE: $
…		…
2498	MODULE = Coro::State PACKAGE = Coro::AnyEvent	2639	MODULE = Coro::State PACKAGE = Coro::AnyEvent
2499		2640
2500	BOOT:	2641	BOOT:
2501	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);	2642	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2502		2643
2503	SV *	2644	void
2504	_schedule (...)	2645	_schedule (...)
2505	PROTOTYPE: @
2506	CODE:	2646	CODE:
2507	{	2647	{
2508	static int incede;	2648	static int incede;
2509		2649
2510	api_cede_notself ();	2650	api_cede_notself (aTHX);
2511		2651
2512	++incede;	2652	++incede;
2513	while (coro_nready >= incede && api_cede ())	2653	while (coro_nready >= incede && api_cede (aTHX))
2514	;	2654	;
2515		2655
2516	sv_setsv (sv_activity, &PL_sv_undef);	2656	sv_setsv (sv_activity, &PL_sv_undef);
2517	if (coro_nready >= incede)	2657	if (coro_nready >= incede)
2518	{	2658	{
…		…
2529	MODULE = Coro::State PACKAGE = PerlIO::cede	2669	MODULE = Coro::State PACKAGE = PerlIO::cede
2530		2670
2531	BOOT:	2671	BOOT:
2532	PerlIO_define_layer (aTHX_ &PerlIO_cede);	2672	PerlIO_define_layer (aTHX_ &PerlIO_cede);
2533		2673
		2674	MODULE = Coro::State PACKAGE = Coro::Semaphore
		2675
		2676	SV *
		2677	new (SV *klass, SV *count_ = 0)
		2678	CODE:
		2679	{
		2680	/* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
		2681	AV *av = newAV ();
		2682	av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
		2683	RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
		2684	}
		2685	OUTPUT:
		2686	RETVAL
		2687
		2688	SV *
		2689	count (SV *self)
		2690	CODE:
		2691	RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
		2692	OUTPUT:
		2693	RETVAL
		2694
		2695	void
		2696	up (SV *self, int adjust = 1)
		2697	ALIAS:
		2698	adjust = 1
		2699	CODE:
		2700	coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
		2701
		2702	void
		2703	down (SV *self)
		2704	CODE:
		2705	api_execute_slf (aTHX_ cv, slf_init_semaphore_down, &ST (0), 1);
		2706
		2707	void
		2708	try (SV *self)
		2709	PPCODE:
		2710	{
		2711	AV *av = (AV *)SvRV (self);
		2712	SV *count_sv = AvARRAY (av)[0];
		2713	IV count = SvIVX (count_sv);
		2714
		2715	if (count > 0)
		2716	{
		2717	--count;
		2718	SvIVX (count_sv) = count;
		2719	XSRETURN_YES;
		2720	}
		2721	else
		2722	XSRETURN_NO;
		2723	}
		2724
		2725	void
		2726	waiters (SV *self)
		2727	CODE:
		2728	{
		2729	AV *av = (AV *)SvRV (self);
		2730
		2731	if (GIMME_V == G_SCALAR)
		2732	XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
		2733	else
		2734	{
		2735	int i;
		2736	EXTEND (SP, AvFILLp (av) + 1 - 1);
		2737	for (i = 1; i <= AvFILLp (av); ++i)
		2738	PUSHs (newSVsv (AvARRAY (av)[i]));
		2739	}
		2740	}
		2741

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