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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.263 by root, Wed Nov 12 04:49:06 2008 UTC vs.
Revision 1.282 by root, Sun Nov 16 10:33:08 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)
128	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
129	# define expect(expr,value) __builtin_expect ((expr),(value))	131	# define expect(expr,value) __builtin_expect ((expr),(value))
130	# define INLINE static inline	132	# define INLINE static inline
131	#else	133	#else
132	# define attribute(x)	134	# define attribute(x)
133	# define BARRIER
134	# define expect(expr,value) (expr)	135	# define expect(expr,value) (expr)
135	# define INLINE static	136	# define INLINE static
136	#endif	137	#endif
137		138
138	#define expect_false(expr) expect ((expr) != 0, 0)	139	#define expect_false(expr) expect ((expr) != 0, 0)
…		…
141	#define NOINLINE attribute ((noinline))	142	#define NOINLINE attribute ((noinline))
142		143
143	#include "CoroAPI.h"	144	#include "CoroAPI.h"
144		145
145	#ifdef USE_ITHREADS	146	#ifdef USE_ITHREADS
146
147	static perl_mutex coro_lock;
148	# define LOCK do { MUTEX_LOCK (&coro_lock); } while (0)
149	# define UNLOCK do { MUTEX_UNLOCK (&coro_lock); } while (0)
150	# if CORO_PTHREAD	147	# if CORO_PTHREAD
151	static void *coro_thx;	148	static void *coro_thx;
152	# endif	149	# endif
153
154	#else
155
156	# define LOCK (void)0
157	# define UNLOCK (void)0
158
159	#endif	150	#endif
160
161	# undef LOCK
162	# define LOCK (void)0
163	# undef UNLOCK
164	# define UNLOCK (void)0
165		151
166	/* helper storage struct for Coro::AIO */	152	/* helper storage struct for Coro::AIO */
167	struct io_state	153	struct io_state
168	{	154	{
169	AV *res;	155	AV *res;
…		…
182	static JMPENV *main_top_env;	168	static JMPENV *main_top_env;
183	static HV *coro_state_stash, *coro_stash;	169	static HV *coro_state_stash, *coro_stash;
184	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 */
185	static volatile struct coro *transfer_next;	171	static volatile struct coro *transfer_next;
186		172
187	struct transfer_args
188	{
189	struct coro *prev, *next;
190	};
191
192	static GV *irsgv; /* $/ */	173	static GV *irsgv; /* $/ */
193	static GV *stdoutgv; /* *STDOUT */	174	static GV *stdoutgv; /* *STDOUT */
194	static SV *rv_diehook;	175	static SV *rv_diehook;
195	static SV *rv_warnhook;	176	static SV *rv_warnhook;
196	static HV *hv_sig; /* %SIG */	177	static HV *hv_sig; /* %SIG */
…		…
214	CC_TRACE_LINE = 0x10, /* trace each statement */	195	CC_TRACE_LINE = 0x10, /* trace each statement */
215	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,	196	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
216	};	197	};
217		198
218	/* this is a structure representing a c-level coroutine */	199	/* this is a structure representing a c-level coroutine */
219	typedef struct coro_cctx {	200	typedef struct coro_cctx
		201	{
220	struct coro_cctx *next;	202	struct coro_cctx *next;
221		203
222	/* the stack */	204	/* the stack */
223	void *sptr;	205	void *sptr;
224	size_t ssize;	206	size_t ssize;
…		…
242	CF_NEW = 0x0004, /* has never been switched to */	224	CF_NEW = 0x0004, /* has never been switched to */
243	CF_DESTROYED = 0x0008, /* coroutine data has been freed */	225	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
244	};	226	};
245		227
246	/* 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 */
247	typedef struct {	229	typedef struct
		230	{
248	SV *defsv;	231	SV *defsv;
249	AV *defav;	232	AV *defav;
250	SV *errsv;	233	SV *errsv;
251	SV *irsgv;	234	SV *irsgv;
252	#define VAR(name,type) type name;	235	#define VAR(name,type) type name;
…		…
256		239
257	#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))
258		241
259	/* this is a structure representing a perl-level coroutine */	242	/* this is a structure representing a perl-level coroutine */
260	struct coro {	243	struct coro {
261	/* the c coroutine allocated to this perl coroutine, if any */	244	/* the C coroutine allocated to this perl coroutine, if any */
262	coro_cctx *cctx;	245	coro_cctx *cctx;
263		246
264	/* process data */	247	/* process data */
		248	struct CoroSLF slf_frame; /* saved slf frame */
265	AV *mainstack;	249	AV *mainstack;
266	perl_slots *slot; /* basically the saved sp */	250	perl_slots *slot; /* basically the saved sp */
267		251
268	AV *args; /* data associated with this coroutine (initial args) */	252	AV *args; /* data associated with this coroutine (initial args) */
269	int refcnt; /* coroutines are refcounted, yes */	253	int refcnt; /* coroutines are refcounted, yes */
270	int flags; /* CF_ flags */	254	int flags; /* CF_ flags */
271	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);
272		257
273	/* statistics */	258	/* statistics */
274	int usecount; /* number of transfers to this coro */	259	int usecount; /* number of transfers to this coro */
275		260
276	/* coro process data */	261	/* coro process data */
…		…
284	struct coro *next, *prev;	269	struct coro *next, *prev;
285	};	270	};
286		271
287	typedef struct coro *Coro__State;	272	typedef struct coro *Coro__State;
288	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 */
289		276
290	/** Coro ********************************************************************/	277	/** Coro ********************************************************************/
291		278
292	#define PRIO_MAX 3	279	#define PRIO_MAX 3
293	#define PRIO_HIGH 1	280	#define PRIO_HIGH 1
…		…
298		285
299	/* for Coro.pm */	286	/* for Coro.pm */
300	static SV *coro_current;	287	static SV *coro_current;
301	static SV *coro_readyhook;	288	static SV *coro_readyhook;
302	static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];	289	static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
303	static int coro_nready;
304	static struct coro *coro_first;	290	static struct coro *coro_first;
		291	#define coro_nready coroapi.nready
305		292
306	/** lowlevel stuff **********************************************************/	293	/** lowlevel stuff **********************************************************/
307		294
308	static SV *	295	static SV *
309	coro_get_sv (pTHX_ const char *name, int create)	296	coro_get_sv (pTHX_ const char *name, int create)
…		…
402	static MGVTBL coro_cv_vtbl = {	389	static MGVTBL coro_cv_vtbl = {
403	0, 0, 0, 0,	390	0, 0, 0, 0,
404	coro_cv_free	391	coro_cv_free
405	};	392	};
406		393
407	#define CORO_MAGIC(sv, type) \	394	#define CORO_MAGIC(sv, type) \
408	SvMAGIC (sv) \	395	expect_true (SvMAGIC (sv)) \
409	? SvMAGIC (sv)->mg_type == type \	396	? expect_true (SvMAGIC (sv)->mg_type == type) \
410	? SvMAGIC (sv) \	397	? SvMAGIC (sv) \
411	: mg_find (sv, type) \	398	: mg_find (sv, type) \
412	: 0	399	: 0
413		400
414	#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)
415	#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)
416		403
…		…
437	mg = CORO_MAGIC_state (coro);	424	mg = CORO_MAGIC_state (coro);
438	return (struct coro *)mg->mg_ptr;	425	return (struct coro *)mg->mg_ptr;
439	}	426	}
440		427
441	#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))
442		442
443	/* the next two functions merely cache the padlists */	443	/* the next two functions merely cache the padlists */
444	static void	444	static void
445	get_padlist (pTHX_ CV *cv)	445	get_padlist (pTHX_ CV *cv)
446	{	446	{
…		…
513	CvPADLIST (cv) = (AV *)POPs;	513	CvPADLIST (cv) = (AV *)POPs;
514	}	514	}
515		515
516	PUTBACK;	516	PUTBACK;
517	}	517	}
		518
		519	slf_frame = c->slf_frame;
518	}	520	}
519		521
520	static void	522	static void
521	save_perl (pTHX_ Coro__State c)	523	save_perl (pTHX_ Coro__State c)
522	{	524	{
		525	c->slf_frame = slf_frame;
		526
523	{	527	{
524	dSP;	528	dSP;
525	I32 cxix = cxstack_ix;	529	I32 cxix = cxstack_ix;
526	PERL_CONTEXT *ccstk = cxstack;	530	PERL_CONTEXT *ccstk = cxstack;
527	PERL_SI *top_si = PL_curstackinfo;	531	PERL_SI *top_si = PL_curstackinfo;
…		…
594	#undef VAR	598	#undef VAR
595	}	599	}
596	}	600	}
597		601
598	/*	602	/*
599	* allocate various perl stacks. This is an exact copy	603	* allocate various perl stacks. This is almost an exact copy
600	* of perl.c:init_stacks, except that it uses less memory	604	* of perl.c:init_stacks, except that it uses less memory
601	* on the (sometimes correct) assumption that coroutines do	605	* on the (sometimes correct) assumption that coroutines do
602	* not usually need a lot of stackspace.	606	* not usually need a lot of stackspace.
603	*/	607	*/
604	#if CORO_PREFER_PERL_FUNCTIONS	608	#if CORO_PREFER_PERL_FUNCTIONS
…		…
725	#ifndef MgPV_nolen_const	729	#ifndef MgPV_nolen_const
726	#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \	730	#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
727	SvPV_nolen((SV*)((mg)->mg_ptr)) : \	731	SvPV_nolen((SV*)((mg)->mg_ptr)) : \
728	(const char*)(mg)->mg_ptr)	732	(const char*)(mg)->mg_ptr)
729	#endif	733	#endif
730
731	/* we sometimes need to create the effect of entersub calling us */
732	#define ENTERSUB_HEAD ENTER; SAVETMPS
733	/* we somtimes need to create the effect of leaving via entersub */
734	#define ENTERSUB_TAIL LEAVE
735		734
736	/*	735	/*
737	* This overrides the default magic get method of %SIG elements.	736	* This overrides the default magic get method of %SIG elements.
738	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook	737	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
739	* and instead of tryign to save and restore the hash elements, we just provide	738	* and instead of tryign to save and restore the hash elements, we just provide
…		…
811		810
812	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;	811	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
813	}	812	}
814		813
815	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
816	coro_setup (pTHX_ struct coro *coro)	828	coro_setup (pTHX_ struct coro *coro)
817	{	829	{
818	/*	830	/*
819	* emulate part of the perl startup here.	831	* emulate part of the perl startup here.
820	*/	832	*/
…		…
859	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	871	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
860	SPAGAIN;	872	SPAGAIN;
861	}	873	}
862		874
863	/* 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
864	* likely was suspended in set_stacklevel, called from entersub.	876	* likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
865	* set_stacklevel doesn't do anything on return, but entersub does LEAVE,
866	* so we ENTER here for symmetry.
867	*/	877	*/
868	ENTERSUB_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 */
869	}	880	}
870		881
871	static void	882	static void
872	coro_destruct (pTHX_ struct coro *coro)	883	coro_destruct (pTHX_ struct coro *coro)
873	{	884	{
…		…
917	static int	928	static int
918	runops_trace (pTHX)	929	runops_trace (pTHX)
919	{	930	{
920	COP *oldcop = 0;	931	COP *oldcop = 0;
921	int oldcxix = -2;	932	int oldcxix = -2;
922	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 */
923	coro_cctx *cctx = coro->cctx;	934	coro_cctx *cctx = coro->cctx;
924		935
925	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))	936	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
926	{	937	{
927	PERL_ASYNC_CHECK ();	938	PERL_ASYNC_CHECK ();
…		…
1037	TAINT_NOT;	1048	TAINT_NOT;
1038	return 0;	1049	return 0;
1039	}	1050	}
1040		1051
1041	static void	1052	static void
1042	prepare_set_stacklevel (struct transfer_args *ta, struct coro_cctx *cctx)	1053	prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1043	{	1054	{
1044	ta->prev = (struct coro *)cctx;	1055	ta->prev = (struct coro *)cctx;
1045	ta->next = 0;	1056	ta->next = 0;
1046	}	1057	}
1047		1058
…		…
1078	INLINE void	1089	INLINE void
1079	transfer_tail (pTHX)	1090	transfer_tail (pTHX)
1080	{	1091	{
1081	struct coro *next = (struct coro *)transfer_next;	1092	struct coro *next = (struct coro *)transfer_next;
1082	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 */
1083	assert (("FATAL: transfer_next was zero in transfer_tail (please report)", next));	1094	assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));
1084		1095
1085	free_coro_mortal (aTHX);	1096	free_coro_mortal (aTHX);
1086	UNLOCK;
1087		1097
1088	if (expect_false (next->throw))	1098	if (expect_false (next->throw))
1089	{	1099	{
1090	SV *exception = sv_2mortal (next->throw);	1100	SV *exception = sv_2mortal (next->throw);
1091		1101
…		…
1107	# endif	1117	# endif
1108	#endif	1118	#endif
1109	{	1119	{
1110	dTHX;	1120	dTHX;
1111		1121
1112	/* entersub called ENTER, but we never 'returned', undo that here */	1122	/* normally we would need to skip the entersub here */
1113	ENTERSUB_TAIL;	1123	/* not doing so will re-execute it, which is exactly what we want */
1114
1115	/* we now skip the entersub that did lead to transfer() */
1116	PL_op = PL_op->op_next;	1124	/* PL_nop = PL_nop->op_next */
1117		1125
1118	/* inject a fake subroutine call to cctx_init */	1126	/* inject a fake subroutine call to cctx_init */
1119	cctx_prepare (aTHX_ (coro_cctx *)arg);	1127	cctx_prepare (aTHX_ (coro_cctx *)arg);
1120		1128
1121	/* 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 */
1122	transfer_tail (aTHX);	1131	transfer_tail (aTHX);
1123		1132
1124	/* 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 */
1125	PL_restartop = PL_op;	1134	PL_restartop = PL_op;
1126	perl_run (PL_curinterp);	1135	perl_run (PL_curinterp);
…		…
1192	cctx->ssize = cctx_stacksize * (long)sizeof (long);	1201	cctx->ssize = cctx_stacksize * (long)sizeof (long);
1193	New (0, cctx->sptr, cctx_stacksize, long);	1202	New (0, cctx->sptr, cctx_stacksize, long);
1194		1203
1195	if (!cctx->sptr)	1204	if (!cctx->sptr)
1196	{	1205	{
1197	perror ("FATAL: unable to allocate stack for coroutine");	1206	perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1198	_exit (EXIT_FAILURE);	1207	_exit (EXIT_FAILURE);
1199	}	1208	}
1200		1209
1201	stack_start = cctx->sptr;	1210	stack_start = cctx->sptr;
1202	stack_size = cctx->ssize;	1211	stack_size = cctx->ssize;
…		…
1285	transfer_check (pTHX_ struct coro *prev, struct coro *next)	1294	transfer_check (pTHX_ struct coro *prev, struct coro *next)
1286	{	1295	{
1287	if (expect_true (prev != next))	1296	if (expect_true (prev != next))
1288	{	1297	{
1289	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))	1298	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1290	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,");
1291		1300
1292	if (expect_false (next->flags & CF_RUNNING))	1301	if (expect_false (next->flags & CF_RUNNING))
1293	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,");
1294		1303
1295	if (expect_false (next->flags & CF_DESTROYED))	1304	if (expect_false (next->flags & CF_DESTROYED))
1296	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,");
1297		1306
1298	#if !PERL_VERSION_ATLEAST (5,10,0)	1307	#if !PERL_VERSION_ATLEAST (5,10,0)
1299	if (expect_false (PL_lex_state != LEX_NOTPARSING))	1308	if (expect_false (PL_lex_state != LEX_NOTPARSING))
1300	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,");
1301	#endif	1310	#endif
1302	}	1311	}
1303	}	1312	}
1304		1313
1305	/* always use the TRANSFER macro */	1314	/* always use the TRANSFER macro */
…		…
1309	dSTACKLEVEL;	1318	dSTACKLEVEL;
1310		1319
1311	/* sometimes transfer is only called to set idle_sp */	1320	/* sometimes transfer is only called to set idle_sp */
1312	if (expect_false (!next))	1321	if (expect_false (!next))
1313	{	1322	{
1314	((coro_cctx *)prev)->idle_sp = STACKLEVEL;	1323	((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1315	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 */
1316	}	1325	}
1317	else if (expect_true (prev != next))	1326	else if (expect_true (prev != next))
1318	{	1327	{
1319	coro_cctx *prev__cctx;	1328	coro_cctx *prev__cctx;
…		…
1326	prev->flags |= CF_RUNNING;	1335	prev->flags |= CF_RUNNING;
1327	}	1336	}
1328		1337
1329	prev->flags &= ~CF_RUNNING;	1338	prev->flags &= ~CF_RUNNING;
1330	next->flags |= CF_RUNNING;	1339	next->flags |= CF_RUNNING;
1331
1332	LOCK;
1333		1340
1334	/* first get rid of the old state */	1341	/* first get rid of the old state */
1335	save_perl (aTHX_ prev);	1342	save_perl (aTHX_ prev);
1336		1343
1337	if (expect_false (next->flags & CF_NEW))	1344	if (expect_false (next->flags & CF_NEW))
…		…
1346		1353
1347	prev__cctx = prev->cctx;	1354	prev__cctx = prev->cctx;
1348		1355
1349	/* possibly untie and reuse the cctx */	1356	/* possibly untie and reuse the cctx */
1350	if (expect_true (	1357	if (expect_true (
1351	prev__cctx->idle_sp == STACKLEVEL	1358	prev__cctx->idle_sp == (void *)stacklevel
1352	&& !(prev__cctx->flags & CC_TRACE)	1359	&& !(prev__cctx->flags & CC_TRACE)
1353	&& !force_cctx	1360	&& !force_cctx
1354	))	1361	))
1355	{	1362	{
1356	/* 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 */
1357	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));
1358		1365
1359	prev->cctx = 0;	1366	prev->cctx = 0;
1360		1367
1361	/* 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 */
…		…
1395	coro_state_destroy (pTHX_ struct coro *coro)	1402	coro_state_destroy (pTHX_ struct coro *coro)
1396	{	1403	{
1397	if (coro->flags & CF_DESTROYED)	1404	if (coro->flags & CF_DESTROYED)
1398	return 0;	1405	return 0;
1399		1406
		1407	if (coro->on_destroy)
		1408	coro->on_destroy (aTHX_ coro);
		1409
1400	coro->flags |= CF_DESTROYED;	1410	coro->flags |= CF_DESTROYED;
1401		1411
1402	if (coro->flags & CF_READY)	1412	if (coro->flags & CF_READY)
1403	{	1413	{
1404	/* reduce nready, as destroying a ready coro effectively unreadies it */	1414	/* reduce nready, as destroying a ready coro effectively unreadies it */
1405	/* alternative: look through all ready queues and remove the coro */	1415	/* alternative: look through all ready queues and remove the coro */
1406	LOCK;
1407	--coro_nready;	1416	--coro_nready;
1408	UNLOCK;
1409	}	1417	}
1410	else	1418	else
1411	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 */
1412		1420
1413	if (coro->mainstack && coro->mainstack != main_mainstack)	1421	if (coro->mainstack && coro->mainstack != main_mainstack)
1414	{	1422	{
1415	struct coro temp;	1423	struct coro temp;
1416		1424
1417	if (coro->flags & CF_RUNNING)	1425	assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1418	croak ("FATAL: tried to destroy currently running coroutine");
1419		1426
1420	save_perl (aTHX_ &temp);	1427	save_perl (aTHX_ &temp);
1421	load_perl (aTHX_ coro);	1428	load_perl (aTHX_ coro);
1422		1429
1423	coro_destruct (aTHX_ coro);	1430	coro_destruct (aTHX_ coro);
…		…
1474	# define MGf_DUP 0	1481	# define MGf_DUP 0
1475	#endif	1482	#endif
1476	};	1483	};
1477		1484
1478	static void	1485	static void
1479	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)
1480	{	1487	{
1481	ta->prev = SvSTATE (prev_sv);	1488	ta->prev = SvSTATE (prev_sv);
1482	ta->next = SvSTATE (next_sv);	1489	ta->next = SvSTATE (next_sv);
1483	TRANSFER_CHECK (*ta);	1490	TRANSFER_CHECK (*ta);
1484	}	1491	}
1485		1492
1486	static void	1493	static void
1487	api_transfer (SV *prev_sv, SV *next_sv)	1494	api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1488	{	1495	{
1489	dTHX;
1490	struct transfer_args ta;	1496	struct coro_transfer_args ta;
1491		1497
1492	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);	1498	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1493	TRANSFER (ta, 1);	1499	TRANSFER (ta, 1);
1494	}	1500	}
1495		1501
1496	/** Coro ********************************************************************/	1502	/** Coro ********************************************************************/
1497		1503
1498	static void	1504	INLINE void
1499	coro_enq (pTHX_ SV *coro_sv)	1505	coro_enq (pTHX_ struct coro *coro)
1500	{	1506	{
1501	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));
1502	}	1508	}
1503		1509
1504	static SV *	1510	INLINE SV *
1505	coro_deq (pTHX)	1511	coro_deq (pTHX)
1506	{	1512	{
1507	int prio;	1513	int prio;
1508		1514
1509	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )	1515	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
…		…
1512		1518
1513	return 0;	1519	return 0;
1514	}	1520	}
1515		1521
1516	static int	1522	static int
1517	api_ready (SV *coro_sv)	1523	api_ready (pTHX_ SV *coro_sv)
1518	{	1524	{
1519	dTHX;
1520	struct coro *coro;	1525	struct coro *coro;
1521	SV *sv_hook;	1526	SV *sv_hook;
1522	void (*xs_hook)(void);	1527	void (*xs_hook)(void);
1523		1528
1524	if (SvROK (coro_sv))	1529	if (SvROK (coro_sv))
…		…
1529	if (coro->flags & CF_READY)	1534	if (coro->flags & CF_READY)
1530	return 0;	1535	return 0;
1531		1536
1532	coro->flags |= CF_READY;	1537	coro->flags |= CF_READY;
1533		1538
1534	LOCK;
1535
1536	sv_hook = coro_nready ? 0 : coro_readyhook;	1539	sv_hook = coro_nready ? 0 : coro_readyhook;
1537	xs_hook = coro_nready ? 0 : coroapi.readyhook;	1540	xs_hook = coro_nready ? 0 : coroapi.readyhook;
1538		1541
1539	coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv));	1542	coro_enq (aTHX_ coro);
1540	++coro_nready;	1543	++coro_nready;
1541		1544
1542	UNLOCK;
1543
1544	if (sv_hook)	1545	if (sv_hook)
1545	{	1546	{
1546	dSP;	1547	dSP;
1547		1548
1548	ENTER;	1549	ENTER;
…		…
1562		1563
1563	return 1;	1564	return 1;
1564	}	1565	}
1565		1566
1566	static int	1567	static int
1567	api_is_ready (SV *coro_sv)	1568	api_is_ready (pTHX_ SV *coro_sv)
1568	{	1569	{
1569	dTHX;
1570
1571	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1570	return !!(SvSTATE (coro_sv)->flags & CF_READY);
1572	}	1571	}
1573		1572
1574	INLINE void	1573	INLINE void
1575	prepare_schedule (pTHX_ struct transfer_args *ta)	1574	prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1576	{	1575	{
1577	SV *prev_sv, *next_sv;	1576	SV *prev_sv, *next_sv;
1578		1577
1579	for (;;)	1578	for (;;)
1580	{	1579	{
1581	LOCK;
1582	next_sv = coro_deq (aTHX);	1580	next_sv = coro_deq (aTHX);
1583		1581
1584	/* nothing to schedule: call the idle handler */	1582	/* nothing to schedule: call the idle handler */
1585	if (expect_false (!next_sv))	1583	if (expect_false (!next_sv))
1586	{	1584	{
1587	dSP;	1585	dSP;
1588	UNLOCK;
1589		1586
1590	ENTER;	1587	ENTER;
1591	SAVETMPS;	1588	SAVETMPS;
1592		1589
1593	PUSHMARK (SP);	1590	PUSHMARK (SP);
…		…
1598	FREETMPS;	1595	FREETMPS;
1599	LEAVE;	1596	LEAVE;
1600	continue;	1597	continue;
1601	}	1598	}
1602		1599
1603	ta->next = SvSTATE (next_sv);	1600	ta->next = SvSTATE_hv (next_sv);
1604		1601
1605	/* cannot transfer to destroyed coros, skip and look for next */	1602	/* cannot transfer to destroyed coros, skip and look for next */
1606	if (expect_false (ta->next->flags & CF_DESTROYED))	1603	if (expect_false (ta->next->flags & CF_DESTROYED))
1607	{	1604	{
1608	UNLOCK;
1609	SvREFCNT_dec (next_sv);	1605	SvREFCNT_dec (next_sv);
1610	/* coro_nready has already been taken care of by destroy */	1606	/* coro_nready has already been taken care of by destroy */
1611	continue;	1607	continue;
1612	}	1608	}
1613		1609
1614	--coro_nready;	1610	--coro_nready;
1615	UNLOCK;
1616	break;	1611	break;
1617	}	1612	}
1618		1613
1619	/* free this only after the transfer */	1614	/* free this only after the transfer */
1620	prev_sv = SvRV (coro_current);	1615	prev_sv = SvRV (coro_current);
1621	ta->prev = SvSTATE (prev_sv);	1616	ta->prev = SvSTATE_hv (prev_sv);
1622	TRANSFER_CHECK (*ta);	1617	TRANSFER_CHECK (*ta);
1623	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));
1624	ta->next->flags &= ~CF_READY;	1619	ta->next->flags &= ~CF_READY;
1625	SvRV_set (coro_current, next_sv);	1620	SvRV_set (coro_current, next_sv);
1626		1621
1627	LOCK;
1628	free_coro_mortal (aTHX);	1622	free_coro_mortal (aTHX);
1629	coro_mortal = prev_sv;	1623	coro_mortal = prev_sv;
1630	UNLOCK;
1631	}	1624	}
1632		1625
1633	INLINE void	1626	INLINE void
1634	prepare_cede (pTHX_ struct transfer_args *ta)	1627	prepare_cede (pTHX_ struct coro_transfer_args *ta)
1635	{	1628	{
1636	api_ready (coro_current);	1629	api_ready (aTHX_ coro_current);
1637	prepare_schedule (aTHX_ ta);	1630	prepare_schedule (aTHX_ ta);
1638	}	1631	}
1639		1632
		1633	INLINE void
		1634	prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
		1635	{
		1636	SV *prev = SvRV (coro_current);
		1637
		1638	if (coro_nready)
		1639	{
		1640	prepare_schedule (aTHX_ ta);
		1641	api_ready (aTHX_ prev);
		1642	}
		1643	else
		1644	prepare_nop (aTHX_ ta);
		1645	}
		1646
		1647	static void
		1648	api_schedule (pTHX)
		1649	{
		1650	struct coro_transfer_args ta;
		1651
		1652	prepare_schedule (aTHX_ &ta);
		1653	TRANSFER (ta, 1);
		1654	}
		1655
1640	static int	1656	static int
1641	prepare_cede_notself (pTHX_ struct transfer_args *ta)	1657	api_cede (pTHX)
1642	{	1658	{
1643	if (coro_nready)	1659	struct coro_transfer_args ta;
1644	{	1660
1645	SV *prev = SvRV (coro_current);
1646	prepare_schedule (aTHX_ ta);	1661	prepare_cede (aTHX_ &ta);
1647	api_ready (prev);	1662
		1663	if (expect_true (ta.prev != ta.next))
		1664	{
		1665	TRANSFER (ta, 1);
1648	return 1;	1666	return 1;
1649	}	1667	}
1650	else	1668	else
1651	return 0;	1669	return 0;
1652	}	1670	}
1653		1671
1654	static void
1655	api_schedule (void)
1656	{
1657	dTHX;
1658	struct transfer_args ta;
1659
1660	prepare_schedule (aTHX_ &ta);
1661	TRANSFER (ta, 1);
1662	}
1663
1664	static int	1672	static int
1665	api_cede (void)	1673	api_cede_notself (pTHX)
1666	{	1674	{
1667	dTHX;	1675	if (coro_nready)
		1676	{
1668	struct transfer_args ta;	1677	struct coro_transfer_args ta;
1669		1678
1670	prepare_cede (aTHX_ &ta);	1679	prepare_cede_notself (aTHX_ &ta);
1671
1672	if (expect_true (ta.prev != ta.next))
1673	{
1674	TRANSFER (ta, 1);	1680	TRANSFER (ta, 1);
1675	return 1;	1681	return 1;
1676	}	1682	}
1677	else	1683	else
1678	return 0;	1684	return 0;
1679	}	1685	}
1680		1686
1681	static int	1687	static void
1682	api_cede_notself (void)
1683	{
1684	dTHX;
1685	struct transfer_args ta;
1686
1687	if (prepare_cede_notself (aTHX_ &ta))
1688	{
1689	TRANSFER (ta, 1);
1690	return 1;
1691	}
1692	else
1693	return 0;
1694	}
1695
1696	static void
1697	api_trace (SV *coro_sv, int flags)	1688	api_trace (pTHX_ SV *coro_sv, int flags)
1698	{	1689	{
1699	dTHX;
1700	struct coro *coro = SvSTATE (coro_sv);	1690	struct coro *coro = SvSTATE (coro_sv);
1701		1691
1702	if (flags & CC_TRACE)	1692	if (flags & CC_TRACE)
1703	{	1693	{
1704	if (!coro->cctx)	1694	if (!coro->cctx)
1705	coro->cctx = cctx_new_run ();	1695	coro->cctx = cctx_new_run ();
1706	else if (!(coro->cctx->flags & CC_TRACE))	1696	else if (!(coro->cctx->flags & CC_TRACE))
1707	croak ("cannot enable tracing on coroutine with custom stack");	1697	croak ("cannot enable tracing on coroutine with custom stack,");
1708		1698
1709	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));	1699	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1710	}	1700	}
1711	else if (coro->cctx && coro->cctx->flags & CC_TRACE)	1701	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1712	{	1702	{
…		…
1717	else	1707	else
1718	coro->slot->runops = RUNOPS_DEFAULT;	1708	coro->slot->runops = RUNOPS_DEFAULT;
1719	}	1709	}
1720	}	1710	}
1721		1711
1722	#if 0
1723	static int
1724	coro_gensub_free (pTHX_ SV *sv, MAGIC *mg)
1725	{
1726	AV *padlist;
1727	AV *av = (AV *)mg->mg_obj;
1728
1729	abort ();
1730
1731	return 0;
1732	}
1733
1734	static MGVTBL coro_gensub_vtbl = {
1735	0, 0, 0, 0,
1736	coro_gensub_free
1737	};
1738	#endif
1739
1740	/*****************************************************************************/	1712	/*****************************************************************************/
1741	/* PerlIO::cede */	1713	/* PerlIO::cede */
1742		1714
1743	typedef struct	1715	typedef struct
1744	{	1716	{
…		…
1771	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);	1743	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1772	double now = nvtime ();	1744	double now = nvtime ();
1773		1745
1774	if (now >= self->next)	1746	if (now >= self->next)
1775	{	1747	{
1776	api_cede ();	1748	api_cede (aTHX);
1777	self->next = now + self->every;	1749	self->next = now + self->every;
1778	}	1750	}
1779		1751
1780	return PerlIOBuf_flush (aTHX_ f);	1752	return PerlIOBuf_flush (aTHX_ f);
1781	}	1753	}
…		…
1810	PerlIOBuf_get_ptr,	1782	PerlIOBuf_get_ptr,
1811	PerlIOBuf_get_cnt,	1783	PerlIOBuf_get_cnt,
1812	PerlIOBuf_set_ptrcnt,	1784	PerlIOBuf_set_ptrcnt,
1813	};	1785	};
1814		1786
		1787	/*****************************************************************************/
		1788
		1789	static const CV *slf_cv; /* for quick consistency check */
		1790
		1791	static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
		1792	static SV *slf_arg0;
		1793	static SV *slf_arg1;
		1794	static SV *slf_arg2;
		1795
		1796	/* this restores the stack in the case we patched the entersub, to */
		1797	/* recreate the stack frame as perl will on following calls */
		1798	/* since entersub cleared the stack */
		1799	static OP *
		1800	pp_restore (pTHX)
		1801	{
		1802	dSP;
		1803
		1804	PUSHMARK (SP);
		1805
		1806	EXTEND (SP, 3);
		1807	if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));
		1808	if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));
		1809	if (slf_arg2) PUSHs (sv_2mortal (slf_arg2));
		1810	PUSHs ((SV *)CvGV (slf_cv));
		1811
		1812	RETURNOP (slf_restore.op_first);
		1813	}
		1814
		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	}
		1820
		1821	static void
		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
		1873
		1874	/*
		1875	* these not obviously related functions are all rolled into one
		1876	* function to increase chances that they all will call transfer with the same
		1877	* stack offset
		1878	* SLF stands for "schedule-like-function".
		1879	*/
		1880	static OP *
		1881	pp_slf (pTHX)
		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 */
		1891	dSP;
		1892	SV **arg = PL_stack_base + TOPMARK + 1;
		1893	int items = SP - arg; /* args without function object */
		1894	SV *gv = *sp;
		1895
		1896	/* do a quick consistency check on the "function" object, and if it isn't */
		1897	/* for us, divert to the real entersub */
		1898	if (SvTYPE (gv) != SVt_PVGV || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
		1899	return PL_ppaddr[OP_ENTERSUB](aTHX);
		1900
		1901	/* pop args */
		1902	SP = PL_stack_base + POPMARK;
		1903
		1904	if (!(PL_op->op_flags & OPf_STACKED))
		1905	{
		1906	/* ampersand-form of call, use @_ instead of stack */
		1907	AV *av = GvAV (PL_defgv);
		1908	arg = AvARRAY (av);
		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;
		1948	}
		1949
		1950	PUTBACK;
		1951	}
		1952
		1953	return NORMAL;
		1954	}
		1955
		1956	static void
		1957	api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, SV **arg, int items)
		1958	{
		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;
		1970	slf_cv = cv;
		1971
		1972	/* we patch the op, and then re-run the whole call */
		1973	/* we have to put the same argument on the stack for this to work */
		1974	/* and this will be done by pp_restore */
		1975	slf_restore.op_next = (OP *)&slf_restore;
		1976	slf_restore.op_type = OP_CUSTOM;
		1977	slf_restore.op_ppaddr = pp_restore;
		1978	slf_restore.op_first = PL_op;
		1979
		1980	slf_arg0 = items > 0 ? SvREFCNT_inc (arg [0]) : 0;
		1981	slf_arg1 = items > 1 ? SvREFCNT_inc (arg [1]) : 0;
		1982	slf_arg2 = items > 2 ? SvREFCNT_inc (arg [2]) : 0;
		1983
		1984	PL_op->op_ppaddr = pp_slf;
		1985
		1986	PL_op = (OP *)&slf_restore;
		1987	}
		1988
		1989	/*****************************************************************************/
		1990
		1991	static void
		1992	coro_semaphore_adjust (pTHX_ AV *av, IV 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 are expected to lock */
		2001	while (count > 0 && AvFILLp (av) > 0)
		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 other 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	SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
		2066	}
		2067	else
		2068	{
		2069	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2070
		2071	frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
		2072	frame->prepare = prepare_schedule;
		2073
		2074	/* to avoid race conditions when a woken-up coro gets terminated */
		2075	/* we arrange for a temporary on_destroy that calls adjust (0) */
		2076	assert (!SvSTATE_current->on_destroy);//D
		2077	SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
		2078	}
		2079
		2080	frame->check = slf_check_semaphore_down;
		2081
		2082	}
		2083
		2084	/*****************************************************************************/
		2085
		2086	#define GENSUB_ARG CvXSUBANY (cv).any_ptr
		2087
		2088	/* create a closure from XS, returns a code reference */
		2089	/* the arg can be accessed via GENSUB_ARG from the callback */
		2090	/* the callback must use dXSARGS/XSRETURN */
		2091	static SV *
		2092	gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
		2093	{
		2094	CV *cv = (CV *)NEWSV (0, 0);
		2095
		2096	sv_upgrade ((SV *)cv, SVt_PVCV);
		2097
		2098	CvANON_on (cv);
		2099	CvISXSUB_on (cv);
		2100	CvXSUB (cv) = xsub;
		2101	GENSUB_ARG = arg;
		2102
		2103	return newRV_noinc ((SV *)cv);
		2104	}
		2105
		2106	/*****************************************************************************/
1815		2107
1816	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_	2108	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1817		2109
1818	PROTOTYPES: DISABLE	2110	PROTOTYPES: DISABLE
1819		2111
1820	BOOT:	2112	BOOT:
1821	{	2113	{
1822	#ifdef USE_ITHREADS	2114	#ifdef USE_ITHREADS
1823	MUTEX_INIT (&coro_lock);
1824	# if CORO_PTHREAD	2115	# if CORO_PTHREAD
1825	coro_thx = PERL_GET_CONTEXT;	2116	coro_thx = PERL_GET_CONTEXT;
1826	# endif	2117	# endif
1827	#endif	2118	#endif
1828	BOOT_PAGESIZE;	2119	BOOT_PAGESIZE;
…		…
1849	main_top_env = PL_top_env;	2140	main_top_env = PL_top_env;
1850		2141
1851	while (main_top_env->je_prev)	2142	while (main_top_env->je_prev)
1852	main_top_env = main_top_env->je_prev;	2143	main_top_env = main_top_env->je_prev;
1853		2144
		2145	{
		2146	SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
		2147
		2148	if (!PL_custom_op_names) PL_custom_op_names = newHV ();
		2149	hv_store_ent (PL_custom_op_names, slf,
		2150	newSVpv ("coro_slf", 0), 0);
		2151
		2152	if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
		2153	hv_store_ent (PL_custom_op_descs, slf,
		2154	newSVpv ("coro schedule like function", 0), 0);
		2155	}
		2156
1854	coroapi.ver = CORO_API_VERSION;	2157	coroapi.ver = CORO_API_VERSION;
1855	coroapi.rev = CORO_API_REVISION;	2158	coroapi.rev = CORO_API_REVISION;
		2159
1856	coroapi.transfer = api_transfer;	2160	coroapi.transfer = api_transfer;
		2161
		2162	coroapi.sv_state = SvSTATE_;
		2163	coroapi.execute_slf = api_execute_slf;
		2164	coroapi.prepare_nop = prepare_nop;
		2165	coroapi.prepare_schedule = prepare_schedule;
		2166	coroapi.prepare_cede = prepare_cede;
		2167	coroapi.prepare_cede_notself = prepare_cede_notself;
1857		2168
1858	{	2169	{
1859	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);	2170	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
1860		2171
1861	if (!svp) croak ("Time::HiRes is required");	2172	if (!svp) croak ("Time::HiRes is required");
…		…
1894	av_push (coro->args, newSVsv (ST (i)));	2205	av_push (coro->args, newSVsv (ST (i)));
1895	}	2206	}
1896	OUTPUT:	2207	OUTPUT:
1897	RETVAL	2208	RETVAL
1898		2209
1899	# these not obviously related functions are all rolled into the same xs
1900	# function to increase chances that they all will call transfer with the same
1901	# stack offset
1902	void	2210	void
1903	_set_stacklevel (...)	2211	_set_stacklevel (...)
1904	ALIAS:	2212	CODE:
1905	Coro::State::transfer = 1	2213	api_execute_slf (aTHX_ cv, slf_init_set_stacklevel, &ST (0), items);
1906	Coro::schedule = 2
1907	Coro::cede = 3
1908	Coro::cede_notself = 4
1909	CODE:
1910	{
1911	struct transfer_args ta;
1912		2214
1913	PUTBACK;	2215	void
1914	switch (ix)	2216	transfer (...)
1915	{	2217	PROTOTYPE: $$
1916	case 0:	2218	CODE:
1917	prepare_set_stacklevel (&ta, (struct coro_cctx *)SvIV (ST (0)));	2219	api_execute_slf (aTHX_ cv, slf_init_transfer, &ST (0), items);
1918	break;
1919
1920	case 1:
1921	if (items != 2)
1922	croak ("Coro::State::transfer (prev, next) expects two arguments, not %d", items);
1923
1924	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
1925	break;
1926
1927	case 2:
1928	prepare_schedule (aTHX_ &ta);
1929	break;
1930
1931	case 3:
1932	prepare_cede (aTHX_ &ta);
1933	break;
1934
1935	case 4:
1936	if (!prepare_cede_notself (aTHX_ &ta))
1937	XSRETURN_EMPTY;
1938
1939	break;
1940	}
1941	SPAGAIN;
1942
1943	BARRIER;
1944	PUTBACK;
1945	TRANSFER (ta, 0);
1946	SPAGAIN; /* might be the sp of a different coroutine now */
1947	/* be extra careful not to ever do anything after TRANSFER */
1948	}
1949		2220
1950	bool	2221	bool
1951	_destroy (SV *coro_sv)	2222	_destroy (SV *coro_sv)
1952	CODE:	2223	CODE:
1953	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));	2224	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
…		…
1960	CODE:	2231	CODE:
1961	_exit (code);	2232	_exit (code);
1962		2233
1963	int	2234	int
1964	cctx_stacksize (int new_stacksize = 0)	2235	cctx_stacksize (int new_stacksize = 0)
		2236	PROTOTYPE: ;$
1965	CODE:	2237	CODE:
1966	RETVAL = cctx_stacksize;	2238	RETVAL = cctx_stacksize;
1967	if (new_stacksize)	2239	if (new_stacksize)
1968	{	2240	{
1969	cctx_stacksize = new_stacksize;	2241	cctx_stacksize = new_stacksize;
…		…
1972	OUTPUT:	2244	OUTPUT:
1973	RETVAL	2245	RETVAL
1974		2246
1975	int	2247	int
1976	cctx_max_idle (int max_idle = 0)	2248	cctx_max_idle (int max_idle = 0)
		2249	PROTOTYPE: ;$
1977	CODE:	2250	CODE:
1978	RETVAL = cctx_max_idle;	2251	RETVAL = cctx_max_idle;
1979	if (max_idle > 1)	2252	if (max_idle > 1)
1980	cctx_max_idle = max_idle;	2253	cctx_max_idle = max_idle;
1981	OUTPUT:	2254	OUTPUT:
1982	RETVAL	2255	RETVAL
1983		2256
1984	int	2257	int
1985	cctx_count ()	2258	cctx_count ()
		2259	PROTOTYPE:
1986	CODE:	2260	CODE:
1987	RETVAL = cctx_count;	2261	RETVAL = cctx_count;
1988	OUTPUT:	2262	OUTPUT:
1989	RETVAL	2263	RETVAL
1990		2264
1991	int	2265	int
1992	cctx_idle ()	2266	cctx_idle ()
		2267	PROTOTYPE:
1993	CODE:	2268	CODE:
1994	RETVAL = cctx_idle;	2269	RETVAL = cctx_idle;
1995	OUTPUT:	2270	OUTPUT:
1996	RETVAL	2271	RETVAL
1997		2272
1998	void	2273	void
1999	list ()	2274	list ()
		2275	PROTOTYPE:
2000	PPCODE:	2276	PPCODE:
2001	{	2277	{
2002	struct coro *coro;	2278	struct coro *coro;
2003	for (coro = coro_first; coro; coro = coro->next)	2279	for (coro = coro_first; coro; coro = coro->next)
2004	if (coro->hv)	2280	if (coro->hv)
…		…
2071	SvREFCNT_dec (self->throw);	2347	SvREFCNT_dec (self->throw);
2072	self->throw = SvOK (throw) ? newSVsv (throw) : 0;	2348	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
2073		2349
2074	void	2350	void
2075	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)	2351	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		2352	PROTOTYPE: $;$
		2353	C_ARGS: aTHX_ coro, flags
2076		2354
2077	SV *	2355	SV *
2078	has_cctx (Coro::State coro)	2356	has_cctx (Coro::State coro)
2079	PROTOTYPE: $	2357	PROTOTYPE: $
2080	CODE:	2358	CODE:
…		…
2104	OUTPUT:	2382	OUTPUT:
2105	RETVAL	2383	RETVAL
2106		2384
2107	void	2385	void
2108	force_cctx ()	2386	force_cctx ()
		2387	PROTOTYPE:
2109	CODE:	2388	CODE:
2110	struct coro *coro = SvSTATE (coro_current);
2111	coro->cctx->idle_sp = 0;	2389	SvSTATE_current->cctx->idle_sp = 0;
2112		2390
2113	void	2391	void
2114	swap_defsv (Coro::State self)	2392	swap_defsv (Coro::State self)
2115	PROTOTYPE: $	2393	PROTOTYPE: $
2116	ALIAS:	2394	ALIAS:
2117	swap_defav = 1	2395	swap_defav = 1
2118	CODE:	2396	CODE:
2119	if (!self->slot)	2397	if (!self->slot)
2120	croak ("cannot swap state with coroutine that has no saved state");	2398	croak ("cannot swap state with coroutine that has no saved state,");
2121	else	2399	else
2122	{	2400	{
2123	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);	2401	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2124	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;	2402	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
2125		2403
…		…
2157	coroapi.schedule = api_schedule;	2435	coroapi.schedule = api_schedule;
2158	coroapi.cede = api_cede;	2436	coroapi.cede = api_cede;
2159	coroapi.cede_notself = api_cede_notself;	2437	coroapi.cede_notself = api_cede_notself;
2160	coroapi.ready = api_ready;	2438	coroapi.ready = api_ready;
2161	coroapi.is_ready = api_is_ready;	2439	coroapi.is_ready = api_is_ready;
2162	coroapi.nready = &coro_nready;	2440	coroapi.nready = coro_nready;
2163	coroapi.current = coro_current;	2441	coroapi.current = coro_current;
2164		2442
2165	GCoroAPI = &coroapi;	2443	GCoroAPI = &coroapi;
2166	sv_setiv (sv, (IV)&coroapi);	2444	sv_setiv (sv, (IV)&coroapi);
2167	SvREADONLY_on (sv);	2445	SvREADONLY_on (sv);
2168	}	2446	}
2169	}	2447	}
		2448
		2449	void
		2450	schedule (...)
		2451	CODE:
		2452	api_execute_slf (aTHX_ cv, slf_init_schedule, &ST (0), 0);
		2453
		2454	void
		2455	cede (...)
		2456	CODE:
		2457	api_execute_slf (aTHX_ cv, slf_init_cede, &ST (0), 0);
		2458
		2459	void
		2460	cede_notself (...)
		2461	CODE:
		2462	api_execute_slf (aTHX_ cv, slf_init_cede_notself, &ST (0), 0);
2170		2463
2171	void	2464	void
2172	_set_current (SV *current)	2465	_set_current (SV *current)
2173	PROTOTYPE: $	2466	PROTOTYPE: $
2174	CODE:	2467	CODE:
…		…
2177		2470
2178	void	2471	void
2179	_set_readyhook (SV *hook)	2472	_set_readyhook (SV *hook)
2180	PROTOTYPE: $	2473	PROTOTYPE: $
2181	CODE:	2474	CODE:
2182	LOCK;
2183	SvREFCNT_dec (coro_readyhook);	2475	SvREFCNT_dec (coro_readyhook);
2184	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;	2476	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2185	UNLOCK;
2186		2477
2187	int	2478	int
2188	prio (Coro::State coro, int newprio = 0)	2479	prio (Coro::State coro, int newprio = 0)
		2480	PROTOTYPE: $;$
2189	ALIAS:	2481	ALIAS:
2190	nice = 1	2482	nice = 1
2191	CODE:	2483	CODE:
2192	{	2484	{
2193	RETVAL = coro->prio;	2485	RETVAL = coro->prio;
…		…
2208		2500
2209	SV *	2501	SV *
2210	ready (SV *self)	2502	ready (SV *self)
2211	PROTOTYPE: $	2503	PROTOTYPE: $
2212	CODE:	2504	CODE:
2213	RETVAL = boolSV (api_ready (self));	2505	RETVAL = boolSV (api_ready (aTHX_ self));
2214	OUTPUT:	2506	OUTPUT:
2215	RETVAL	2507	RETVAL
2216		2508
2217	int	2509	int
2218	nready (...)	2510	nready (...)
…		…
2225	# for async_pool speedup	2517	# for async_pool speedup
2226	void	2518	void
2227	_pool_1 (SV *cb)	2519	_pool_1 (SV *cb)
2228	CODE:	2520	CODE:
2229	{	2521	{
2230	struct coro *coro = SvSTATE (coro_current);
2231	HV *hv = (HV *)SvRV (coro_current);	2522	HV *hv = (HV *)SvRV (coro_current);
		2523	struct coro *coro = SvSTATE_hv ((SV *)hv);
2232	AV *defav = GvAV (PL_defgv);	2524	AV *defav = GvAV (PL_defgv);
2233	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);	2525	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2234	AV *invoke_av;	2526	AV *invoke_av;
2235	int i, len;	2527	int i, len;
2236		2528
…		…
2257	{	2549	{
2258	av_fill (defav, len - 1);	2550	av_fill (defav, len - 1);
2259	for (i = 0; i < len; ++i)	2551	for (i = 0; i < len; ++i)
2260	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));	2552	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2261	}	2553	}
2262
2263	SvREFCNT_dec (invoke);
2264	}	2554	}
2265		2555
2266	void	2556	void
2267	_pool_2 (SV *cb)	2557	_pool_2 (SV *cb)
2268	CODE:	2558	CODE:
2269	{	2559	{
2270	struct coro *coro = SvSTATE (coro_current);	2560	struct coro *coro = SvSTATE_current;
2271		2561
2272	sv_setsv (cb, &PL_sv_undef);	2562	sv_setsv (cb, &PL_sv_undef);
2273		2563
2274	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;	2564	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2275	coro->saved_deffh = 0;	2565	coro->saved_deffh = 0;
…		…
2288	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);	2578	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2289		2579
2290	coro->prio = 0;	2580	coro->prio = 0;
2291		2581
2292	if (coro->cctx && (coro->cctx->flags & CC_TRACE))	2582	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2293	api_trace (coro_current, 0);	2583	api_trace (aTHX_ coro_current, 0);
2294		2584
2295	av_push (av_async_pool, newSVsv (coro_current));	2585	av_push (av_async_pool, newSVsv (coro_current));
2296	}	2586	}
2297
2298	#if 0
2299
2300	void
2301	_generator_call (...)
2302	PROTOTYPE: @
2303	PPCODE:
2304	fprintf (stderr, "call %p\n", CvXSUBANY(cv).any_ptr);
2305	xxxx
2306	abort ();
2307
2308	SV *
2309	gensub (SV *sub, ...)
2310	PROTOTYPE: &;@
2311	CODE:
2312	{
2313	struct coro *coro;
2314	MAGIC *mg;
2315	CV *xcv;
2316	CV *ncv = (CV *)newSV_type (SVt_PVCV);
2317	int i;
2318
2319	CvGV (ncv) = CvGV (cv);
2320	CvFILE (ncv) = CvFILE (cv);
2321
2322	Newz (0, coro, 1, struct coro);
2323	coro->args = newAV ();
2324	coro->flags = CF_NEW;
2325
2326	av_extend (coro->args, items - 1);
2327	for (i = 1; i < items; i++)
2328	av_push (coro->args, newSVsv (ST (i)));
2329
2330	CvISXSUB_on (ncv);
2331	CvXSUBANY (ncv).any_ptr = (void *)coro;
2332
2333	xcv = GvCV (gv_fetchpv ("Coro::_generator_call", 0, SVt_PVCV));
2334
2335	CvXSUB (ncv) = CvXSUB (xcv);
2336	CvANON_on (ncv);
2337
2338	mg = sv_magicext ((SV *)ncv, 0, CORO_MAGIC_type_state, &coro_gensub_vtbl, (char *)coro, 0);
2339	RETVAL = newRV_noinc ((SV *)ncv);
2340	}
2341	OUTPUT:
2342	RETVAL
2343
2344	#endif
2345		2587
2346		2588
2347	MODULE = Coro::State PACKAGE = Coro::AIO	2589	MODULE = Coro::State PACKAGE = Coro::AIO
2348		2590
2349	void	2591	void
2350	_get_state (SV *self)	2592	_get_state (SV *self)
		2593	PROTOTYPE: $
2351	PPCODE:	2594	PPCODE:
2352	{	2595	{
2353	AV *defav = GvAV (PL_defgv);	2596	AV *defav = GvAV (PL_defgv);
2354	AV *av = newAV ();	2597	AV *av = newAV ();
2355	int i;	2598	int i;
…		…
2370		2613
2371	av_push (av, data_sv);	2614	av_push (av, data_sv);
2372		2615
2373	XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));	2616	XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
2374		2617
2375	api_ready (self);	2618	api_ready (aTHX_ self);
2376	}	2619	}
2377		2620
2378	void	2621	void
2379	_set_state (SV *state)	2622	_set_state (SV *state)
2380	PROTOTYPE: $	2623	PROTOTYPE: $
…		…
2398	MODULE = Coro::State PACKAGE = Coro::AnyEvent	2641	MODULE = Coro::State PACKAGE = Coro::AnyEvent
2399		2642
2400	BOOT:	2643	BOOT:
2401	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);	2644	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2402		2645
2403	SV *	2646	void
2404	_schedule (...)	2647	_schedule (...)
2405	PROTOTYPE: @
2406	CODE:	2648	CODE:
2407	{	2649	{
2408	static int incede;	2650	static int incede;
2409		2651
2410	api_cede_notself ();	2652	api_cede_notself (aTHX);
2411		2653
2412	++incede;	2654	++incede;
2413	while (coro_nready >= incede && api_cede ())	2655	while (coro_nready >= incede && api_cede (aTHX))
2414	;	2656	;
2415		2657
2416	sv_setsv (sv_activity, &PL_sv_undef);	2658	sv_setsv (sv_activity, &PL_sv_undef);
2417	if (coro_nready >= incede)	2659	if (coro_nready >= incede)
2418	{	2660	{
…		…
2429	MODULE = Coro::State PACKAGE = PerlIO::cede	2671	MODULE = Coro::State PACKAGE = PerlIO::cede
2430		2672
2431	BOOT:	2673	BOOT:
2432	PerlIO_define_layer (aTHX_ &PerlIO_cede);	2674	PerlIO_define_layer (aTHX_ &PerlIO_cede);
2433		2675
		2676	MODULE = Coro::State PACKAGE = Coro::Semaphore
		2677
		2678	SV *
		2679	new (SV *klass, SV *count_ = 0)
		2680	CODE:
		2681	{
		2682	/* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
		2683	AV *av = newAV ();
		2684	av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
		2685	RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
		2686	}
		2687	OUTPUT:
		2688	RETVAL
		2689
		2690	SV *
		2691	count (SV *self)
		2692	CODE:
		2693	RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
		2694	OUTPUT:
		2695	RETVAL
		2696
		2697	void
		2698	up (SV *self, int adjust = 1)
		2699	ALIAS:
		2700	adjust = 1
		2701	CODE:
		2702	coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
		2703
		2704	void
		2705	down (SV *self)
		2706	CODE:
		2707	api_execute_slf (aTHX_ cv, slf_init_semaphore_down, &ST (0), 1);
		2708
		2709	void
		2710	try (SV *self)
		2711	PPCODE:
		2712	{
		2713	AV *av = (AV *)SvRV (self);
		2714	SV *count_sv = AvARRAY (av)[0];
		2715	IV count = SvIVX (count_sv);
		2716
		2717	if (count > 0)
		2718	{
		2719	--count;
		2720	SvIVX (count_sv) = count;
		2721	XSRETURN_YES;
		2722	}
		2723	else
		2724	XSRETURN_NO;
		2725	}
		2726
		2727	void
		2728	waiters (SV *self)
		2729	CODE:
		2730	{
		2731	AV *av = (AV *)SvRV (self);
		2732
		2733	if (GIMME_V == G_SCALAR)
		2734	XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
		2735	else
		2736	{
		2737	int i;
		2738	EXTEND (SP, AvFILLp (av) + 1 - 1);
		2739	for (i = 1; i <= AvFILLp (av); ++i)
		2740	PUSHs (newSVsv (AvARRAY (av)[i]));
		2741	}
		2742	}
		2743

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