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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.241 by root, Mon Jul 21 02:39:15 2008 UTC vs.
Revision 1.278 by root, Sun Nov 16 07:09:28 2008 UTC

…		…
4	#define PERL_EXT	4	#define PERL_EXT
5		5
6	#include "EXTERN.h"	6	#include "EXTERN.h"
7	#include "perl.h"	7	#include "perl.h"
8	#include "XSUB.h"	8	#include "XSUB.h"
		9	#include "perliol.h"
9		10
10	#include "patchlevel.h"	11	#include "patchlevel.h"
11		12
12	#include <stdio.h>	13	#include <stdio.h>
13	#include <errno.h>	14	#include <errno.h>
…		…
45	# define BOOT_PAGESIZE (void)0	46	# define BOOT_PAGESIZE (void)0
46	#endif	47	#endif
47		48
48	#if CORO_USE_VALGRIND	49	#if CORO_USE_VALGRIND
49	# include <valgrind/valgrind.h>	50	# include <valgrind/valgrind.h>
50	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
51	#else
52	# define REGISTER_STACK(cctx,start,end)
53	#endif	51	#endif
54		52
55	/* the maximum number of idle cctx that will be pooled */	53	/* the maximum number of idle cctx that will be pooled */
56	#define MAX_IDLE_CCTX 8	54	static int cctx_max_idle = 4;
57		55
58	#define PERL_VERSION_ATLEAST(a,b,c) \	56	#define PERL_VERSION_ATLEAST(a,b,c) \
59	(PERL_REVISION > (a) \	57	(PERL_REVISION > (a) \
60	|| (PERL_REVISION == (a) \	58	|| (PERL_REVISION == (a) \
61	&& (PERL_VERSION > (b) \	59	&& (PERL_VERSION > (b) \
…		…
80	# ifndef IS_PADCONST	78	# ifndef IS_PADCONST
81	# define IS_PADCONST(v) 0	79	# define IS_PADCONST(v) 0
82	# endif	80	# endif
83	#endif	81	#endif
84		82
		83	/* 5.11 */
		84	#ifndef CxHASARGS
		85	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
		86	#endif
		87
		88	/* 5.10.0 */
		89	#ifndef SvREFCNT_inc_NN
		90	# define SvREFCNT_inc_NN(sv) SvREFCNT_inc (sv)
		91	#endif
		92
85	/* 5.8.8 */	93	/* 5.8.8 */
86	#ifndef GV_NOTQUAL	94	#ifndef GV_NOTQUAL
87	# define GV_NOTQUAL 0	95	# define GV_NOTQUAL 0
88	#endif	96	#endif
89	#ifndef newSV	97	#ifndef newSV
90	# define newSV(l) NEWSV(0,l)	98	# define newSV(l) NEWSV(0,l)
91	#endif	99	#endif
92		100
93	/* 5.11 */
94	#ifndef CxHASARGS
95	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
96	#endif
97
98	/* 5.8.7 */	101	/* 5.8.7 */
99	#ifndef SvRV_set	102	#ifndef SvRV_set
100	# define SvRV_set(s,v) SvRV(s) = (v)	103	# define SvRV_set(s,v) SvRV(s) = (v)
101	#endif	104	#endif
102		105
…		…
113	# define CORO_PREFER_PERL_FUNCTIONS 0	116	# define CORO_PREFER_PERL_FUNCTIONS 0
114	#endif	117	#endif
115		118
116	/* 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
117	* portable way as possible. */	120	* portable way as possible. */
118	#define dSTACKLEVEL volatile char stacklevel	121	#if __GNUC__ >= 4
119	#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
120		126
121	#define IN_DESTRUCT (PL_main_cv == Nullcv)	127	#define IN_DESTRUCT (PL_main_cv == Nullcv)
122		128
123	#if __GNUC__ >= 3	129	#if __GNUC__ >= 3
124	# define attribute(x) __attribute__(x)	130	# define attribute(x) __attribute__(x)
125	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
126	# define expect(expr,value) __builtin_expect ((expr),(value))	131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define INLINE static inline
127	#else	133	#else
128	# define attribute(x)	134	# define attribute(x)
129	# define BARRIER
130	# define expect(expr,value) (expr)	135	# define expect(expr,value) (expr)
		136	# define INLINE static
131	#endif	137	#endif
132		138
133	#define expect_false(expr) expect ((expr) != 0, 0)	139	#define expect_false(expr) expect ((expr) != 0, 0)
134	#define expect_true(expr) expect ((expr) != 0, 1)	140	#define expect_true(expr) expect ((expr) != 0, 1)
135		141
136	#define NOINLINE attribute ((noinline))	142	#define NOINLINE attribute ((noinline))
137		143
138	#include "CoroAPI.h"	144	#include "CoroAPI.h"
139		145
140	#ifdef USE_ITHREADS	146	#ifdef USE_ITHREADS
		147
141	static perl_mutex coro_mutex;	148	static perl_mutex coro_lock;
142	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	149	# define LOCK do { MUTEX_LOCK (&coro_lock); } while (0)
143	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	150	# define UNLOCK do { MUTEX_UNLOCK (&coro_lock); } while (0)
		151	# if CORO_PTHREAD
		152	static void *coro_thx;
		153	# endif
		154
144	#else	155	#else
		156
145	# define LOCK (void)0	157	# define LOCK (void)0
146	# define UNLOCK (void)0	158	# define UNLOCK (void)0
		159
147	#endif	160	#endif
		161
		162	# undef LOCK
		163	# define LOCK (void)0
		164	# undef UNLOCK
		165	# define UNLOCK (void)0
148		166
149	/* helper storage struct for Coro::AIO */	167	/* helper storage struct for Coro::AIO */
150	struct io_state	168	struct io_state
151	{	169	{
		170	AV *res;
152	int errorno;	171	int errorno;
153	I32 laststype;	172	I32 laststype; /* U16 in 5.10.0 */
154	int laststatval;	173	int laststatval;
155	Stat_t statcache;	174	Stat_t statcache;
156	};	175	};
157		176
		177	static double (*nvtime)(); /* so why doesn't it take void? */
		178
		179	static U32 cctx_gen;
158	static size_t coro_stacksize = CORO_STACKSIZE;	180	static size_t cctx_stacksize = CORO_STACKSIZE;
159	static struct CoroAPI coroapi;	181	static struct CoroAPI coroapi;
160	static AV *main_mainstack; /* used to differentiate between $main and others */	182	static AV *main_mainstack; /* used to differentiate between $main and others */
161	static JMPENV *main_top_env;	183	static JMPENV *main_top_env;
162	static HV *coro_state_stash, *coro_stash;	184	static HV *coro_state_stash, *coro_stash;
163	static volatile SV *coro_mortal; /* will be freed after next transfer */	185	static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
		186	static volatile struct coro *transfer_next;
164		187
165	static GV *irsgv; /* $/ */	188	static GV *irsgv; /* $/ */
166	static GV *stdoutgv; /* *STDOUT */	189	static GV *stdoutgv; /* *STDOUT */
167	static SV *rv_diehook;	190	static SV *rv_diehook;
168	static SV *rv_warnhook;	191	static SV *rv_warnhook;
…		…
187	CC_TRACE_LINE = 0x10, /* trace each statement */	210	CC_TRACE_LINE = 0x10, /* trace each statement */
188	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,	211	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
189	};	212	};
190		213
191	/* this is a structure representing a c-level coroutine */	214	/* this is a structure representing a c-level coroutine */
192	typedef struct coro_cctx {	215	typedef struct coro_cctx
		216	{
193	struct coro_cctx *next;	217	struct coro_cctx *next;
194		218
195	/* the stack */	219	/* the stack */
196	void *sptr;	220	void *sptr;
197	size_t ssize;	221	size_t ssize;
…		…
200	void *idle_sp; /* sp of top-level transfer/schedule/cede call */	224	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
201	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */	225	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
202	JMPENV *top_env;	226	JMPENV *top_env;
203	coro_context cctx;	227	coro_context cctx;
204		228
		229	U32 gen;
205	#if CORO_USE_VALGRIND	230	#if CORO_USE_VALGRIND
206	int valgrind_id;	231	int valgrind_id;
207	#endif	232	#endif
208	unsigned char flags;	233	unsigned char flags;
209	} coro_cctx;	234	} coro_cctx;
…		…
214	CF_NEW = 0x0004, /* has never been switched to */	239	CF_NEW = 0x0004, /* has never been switched to */
215	CF_DESTROYED = 0x0008, /* coroutine data has been freed */	240	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
216	};	241	};
217		242
218	/* the structure where most of the perl state is stored, overlaid on the cxstack */	243	/* the structure where most of the perl state is stored, overlaid on the cxstack */
219	typedef struct {	244	typedef struct
		245	{
220	SV *defsv;	246	SV *defsv;
221	AV *defav;	247	AV *defav;
222	SV *errsv;	248	SV *errsv;
223	SV *irsgv;	249	SV *irsgv;
224	#define VAR(name,type) type name;	250	#define VAR(name,type) type name;
…		…
228		254
229	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))	255	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
230		256
231	/* this is a structure representing a perl-level coroutine */	257	/* this is a structure representing a perl-level coroutine */
232	struct coro {	258	struct coro {
233	/* the c coroutine allocated to this perl coroutine, if any */	259	/* the C coroutine allocated to this perl coroutine, if any */
234	coro_cctx *cctx;	260	coro_cctx *cctx;
235		261
236	/* process data */	262	/* process data */
		263	struct CoroSLF slf_frame; /* saved slf frame */
237	AV *mainstack;	264	AV *mainstack;
238	perl_slots *slot; /* basically the saved sp */	265	perl_slots *slot; /* basically the saved sp */
239		266
240	AV *args; /* data associated with this coroutine (initial args) */	267	AV *args; /* data associated with this coroutine (initial args) */
241	int refcnt; /* coroutines are refcounted, yes */	268	int refcnt; /* coroutines are refcounted, yes */
…		…
256	struct coro *next, *prev;	283	struct coro *next, *prev;
257	};	284	};
258		285
259	typedef struct coro *Coro__State;	286	typedef struct coro *Coro__State;
260	typedef struct coro *Coro__State_or_hashref;	287	typedef struct coro *Coro__State_or_hashref;
		288
		289	static struct CoroSLF slf_frame; /* the current slf frame */
261		290
262	/** Coro ********************************************************************/	291	/** Coro ********************************************************************/
263		292
264	#define PRIO_MAX 3	293	#define PRIO_MAX 3
265	#define PRIO_HIGH 1	294	#define PRIO_HIGH 1
…		…
269	#define PRIO_MIN -4	298	#define PRIO_MIN -4
270		299
271	/* for Coro.pm */	300	/* for Coro.pm */
272	static SV *coro_current;	301	static SV *coro_current;
273	static SV *coro_readyhook;	302	static SV *coro_readyhook;
274	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	303	static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
275	static int coro_nready;
276	static struct coro *coro_first;	304	static struct coro *coro_first;
		305	#define coro_nready coroapi.nready
277		306
278	/** lowlevel stuff **********************************************************/	307	/** lowlevel stuff **********************************************************/
279		308
280	static SV *	309	static SV *
281	coro_get_sv (pTHX_ const char *name, int create)	310	coro_get_sv (pTHX_ const char *name, int create)
…		…
321	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	350	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
322	#endif	351	#endif
323	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	352	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
324	--AvFILLp (padlist);	353	--AvFILLp (padlist);
325		354
326	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	355	av_store (newpadlist, 0, SvREFCNT_inc_NN (*av_fetch (padlist, 0, FALSE)));
327	av_store (newpadlist, 1, (SV *)newpad);	356	av_store (newpadlist, 1, (SV *)newpad);
328		357
329	return newpadlist;	358	return newpadlist;
330	}	359	}
331		360
…		…
361		390
362	/* casting is fun. */	391	/* casting is fun. */
363	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	392	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
364	free_padlist (aTHX_ padlist);	393	free_padlist (aTHX_ padlist);
365		394
		395	SvREFCNT_dec (av); /* sv_magicext increased the refcount */
		396
366	return 0;	397	return 0;
367	}	398	}
368		399
369	#define CORO_MAGIC_type_cv PERL_MAGIC_ext	400	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
370	#define CORO_MAGIC_type_state PERL_MAGIC_ext	401	#define CORO_MAGIC_type_state PERL_MAGIC_ext
…		…
372	static MGVTBL coro_cv_vtbl = {	403	static MGVTBL coro_cv_vtbl = {
373	0, 0, 0, 0,	404	0, 0, 0, 0,
374	coro_cv_free	405	coro_cv_free
375	};	406	};
376		407
377	#define CORO_MAGIC(sv,type) \	408	#define CORO_MAGIC(sv, type) \
378	SvMAGIC (sv) \	409	SvMAGIC (sv) \
379	? SvMAGIC (sv)->mg_type == type \	410	? SvMAGIC (sv)->mg_type == type \
380	? SvMAGIC (sv) \	411	? SvMAGIC (sv) \
381	: mg_find (sv, type) \	412	: mg_find (sv, type) \
382	: 0	413	: 0
383		414
384	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)	415	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
385	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)	416	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
386		417
387	static struct coro *	418	INLINE struct coro *
388	SvSTATE_ (pTHX_ SV *coro)	419	SvSTATE_ (pTHX_ SV *coro)
389	{	420	{
390	HV *stash;	421	HV *stash;
391	MAGIC *mg;	422	MAGIC *mg;
392		423
…		…
420	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))	451	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
421	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];	452	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
422	else	453	else
423	{	454	{
424	#if CORO_PREFER_PERL_FUNCTIONS	455	#if CORO_PREFER_PERL_FUNCTIONS
425	/* this is probably cleaner, but also slower? */	456	/* this is probably cleaner? but also slower! */
		457	/* in practise, it seems to be less stable */
426	CV *cp = Perl_cv_clone (cv);	458	CV *cp = Perl_cv_clone (cv);
427	CvPADLIST (cv) = CvPADLIST (cp);	459	CvPADLIST (cv) = CvPADLIST (cp);
428	CvPADLIST (cp) = 0;	460	CvPADLIST (cp) = 0;
429	SvREFCNT_dec (cp);	461	SvREFCNT_dec (cp);
430	#else	462	#else
…		…
482	CvPADLIST (cv) = (AV *)POPs;	514	CvPADLIST (cv) = (AV *)POPs;
483	}	515	}
484		516
485	PUTBACK;	517	PUTBACK;
486	}	518	}
		519
		520	slf_frame = c->slf_frame;
487	}	521	}
488		522
489	static void	523	static void
490	save_perl (pTHX_ Coro__State c)	524	save_perl (pTHX_ Coro__State c)
491	{	525	{
		526	c->slf_frame = slf_frame;
		527
492	{	528	{
493	dSP;	529	dSP;
494	I32 cxix = cxstack_ix;	530	I32 cxix = cxstack_ix;
495	PERL_CONTEXT *ccstk = cxstack;	531	PERL_CONTEXT *ccstk = cxstack;
496	PERL_SI *top_si = PL_curstackinfo;	532	PERL_SI *top_si = PL_curstackinfo;
…		…
563	#undef VAR	599	#undef VAR
564	}	600	}
565	}	601	}
566		602
567	/*	603	/*
568	* allocate various perl stacks. This is an exact copy	604	* allocate various perl stacks. This is almost an exact copy
569	* of perl.c:init_stacks, except that it uses less memory	605	* of perl.c:init_stacks, except that it uses less memory
570	* on the (sometimes correct) assumption that coroutines do	606	* on the (sometimes correct) assumption that coroutines do
571	* not usually need a lot of stackspace.	607	* not usually need a lot of stackspace.
572	*/	608	*/
573	#if CORO_PREFER_PERL_FUNCTIONS	609	#if CORO_PREFER_PERL_FUNCTIONS
…		…
616		652
617	/*	653	/*
618	* destroy the stacks, the callchain etc...	654	* destroy the stacks, the callchain etc...
619	*/	655	*/
620	static void	656	static void
621	coro_destroy_stacks (pTHX)	657	coro_destruct_stacks (pTHX)
622	{	658	{
623	while (PL_curstackinfo->si_next)	659	while (PL_curstackinfo->si_next)
624	PL_curstackinfo = PL_curstackinfo->si_next;	660	PL_curstackinfo = PL_curstackinfo->si_next;
625		661
626	while (PL_curstackinfo)	662	while (PL_curstackinfo)
…		…
663	#undef VAR	699	#undef VAR
664	}	700	}
665	else	701	else
666	slot = coro->slot;	702	slot = coro->slot;
667		703
		704	if (slot)
		705	{
668	rss += sizeof (slot->curstackinfo);	706	rss += sizeof (slot->curstackinfo);
669	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);	707	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
670	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);	708	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
671	rss += slot->tmps_max * sizeof (SV *);	709	rss += slot->tmps_max * sizeof (SV *);
672	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);	710	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
673	rss += slot->scopestack_max * sizeof (I32);	711	rss += slot->scopestack_max * sizeof (I32);
674	rss += slot->savestack_max * sizeof (ANY);	712	rss += slot->savestack_max * sizeof (ANY);
675		713
676	#if !PERL_VERSION_ATLEAST (5,10,0)	714	#if !PERL_VERSION_ATLEAST (5,10,0)
677	rss += slot->retstack_max * sizeof (OP *);	715	rss += slot->retstack_max * sizeof (OP *);
678	#endif	716	#endif
		717	}
679	}	718	}
680		719
681	return rss;	720	return rss;
682	}	721	}
683		722
…		…
772		811
773	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;	812	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
774	}	813	}
775		814
776	static void	815	static void
		816	prepare_nop (pTHX_ struct coro_transfer_args *ta)
		817	{
		818	/* kind of mega-hacky, but works */
		819	ta->next = ta->prev = (struct coro *)ta;
		820	}
		821
		822	static int
		823	slf_check_nop (pTHX_ struct CoroSLF *frame)
		824	{
		825	return 0;
		826	}
		827
		828	static void
777	coro_setup (pTHX_ struct coro *coro)	829	coro_setup (pTHX_ struct coro *coro)
778	{	830	{
779	/*	831	/*
780	* emulate part of the perl startup here.	832	* emulate part of the perl startup here.
781	*/	833	*/
…		…
801	GvSV (PL_defgv) = newSV (0);	853	GvSV (PL_defgv) = newSV (0);
802	GvAV (PL_defgv) = coro->args; coro->args = 0;	854	GvAV (PL_defgv) = coro->args; coro->args = 0;
803	GvSV (PL_errgv) = newSV (0);	855	GvSV (PL_errgv) = newSV (0);
804	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);	856	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
805	PL_rs = newSVsv (GvSV (irsgv));	857	PL_rs = newSVsv (GvSV (irsgv));
806	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);	858	PL_defoutgv = (GV *)SvREFCNT_inc_NN (stdoutgv);
807		859
808	{	860	{
809	dSP;	861	dSP;
810	LOGOP myop;	862	UNOP myop;
811		863
812	Zero (&myop, 1, LOGOP);	864	Zero (&myop, 1, UNOP);
813	myop.op_next = Nullop;	865	myop.op_next = Nullop;
814	myop.op_flags = OPf_WANT_VOID;	866	myop.op_flags = OPf_WANT_VOID;
815		867
816	PUSHMARK (SP);	868	PUSHMARK (SP);
817	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));	869	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
…		…
820	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	872	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
821	SPAGAIN;	873	SPAGAIN;
822	}	874	}
823		875
824	/* this newly created coroutine might be run on an existing cctx which most	876	/* this newly created coroutine might be run on an existing cctx which most
825	* likely was suspended in set_stacklevel, called from entersub.	877	* likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
826	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
827	* so we ENTER here for symmetry
828	*/	878	*/
829	ENTER;	879	slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
		880	slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
830	}	881	}
831		882
832	static void	883	static void
833	coro_destroy (pTHX_ struct coro *coro)	884	coro_destruct (pTHX_ struct coro *coro)
834	{	885	{
835	if (!IN_DESTRUCT)	886	if (!IN_DESTRUCT)
836	{	887	{
837	/* restore all saved variables and stuff */	888	/* restore all saved variables and stuff */
838	LEAVE_SCOPE (0);	889	LEAVE_SCOPE (0);
…		…
860	SvREFCNT_dec (PL_warnhook);	911	SvREFCNT_dec (PL_warnhook);
861		912
862	SvREFCNT_dec (coro->saved_deffh);	913	SvREFCNT_dec (coro->saved_deffh);
863	SvREFCNT_dec (coro->throw);	914	SvREFCNT_dec (coro->throw);
864		915
865	coro_destroy_stacks (aTHX);	916	coro_destruct_stacks (aTHX);
866	}	917	}
867		918
868	static void	919	INLINE void
869	free_coro_mortal (pTHX)	920	free_coro_mortal (pTHX)
870	{	921	{
871	if (expect_true (coro_mortal))	922	if (expect_true (coro_mortal))
872	{	923	{
873	SvREFCNT_dec (coro_mortal);	924	SvREFCNT_dec (coro_mortal);
…		…
907	: cx->blk_gimme == G_SCALAR ? bot + 1	958	: cx->blk_gimme == G_SCALAR ? bot + 1
908	: bot;	959	: bot;
909		960
910	av_extend (av, top - bot);	961	av_extend (av, top - bot);
911	while (bot < top)	962	while (bot < top)
912	av_push (av, SvREFCNT_inc (*bot++));	963	av_push (av, SvREFCNT_inc_NN (*bot++));
913		964
914	PL_runops = RUNOPS_DEFAULT;	965	PL_runops = RUNOPS_DEFAULT;
915	ENTER;	966	ENTER;
916	SAVETMPS;	967	SAVETMPS;
917	EXTEND (SP, 3);	968	EXTEND (SP, 3);
…		…
997		1048
998	TAINT_NOT;	1049	TAINT_NOT;
999	return 0;	1050	return 0;
1000	}	1051	}
1001		1052
		1053	static void
		1054	prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
		1055	{
		1056	ta->prev = (struct coro *)cctx;
		1057	ta->next = 0;
		1058	}
		1059
1002	/* inject a fake call to Coro::State::_cctx_init into the execution */	1060	/* inject a fake call to Coro::State::_cctx_init into the execution */
1003	/* _cctx_init should be careful, as it could be called at almost any time */	1061	/* _cctx_init should be careful, as it could be called at almost any time */
1004	/* during execution of a perl program */	1062	/* during execution of a perl program */
		1063	/* also initialises PL_top_env */
1005	static void NOINLINE	1064	static void NOINLINE
1006	cctx_prepare (pTHX_ coro_cctx *cctx)	1065	cctx_prepare (pTHX_ coro_cctx *cctx)
1007	{	1066	{
1008	dSP;	1067	dSP;
1009	LOGOP myop;	1068	UNOP myop;
1010		1069
1011	PL_top_env = &PL_start_env;	1070	PL_top_env = &PL_start_env;
1012		1071
1013	if (cctx->flags & CC_TRACE)	1072	if (cctx->flags & CC_TRACE)
1014	PL_runops = runops_trace;	1073	PL_runops = runops_trace;
1015		1074
1016	Zero (&myop, 1, LOGOP);	1075	Zero (&myop, 1, UNOP);
1017	myop.op_next = PL_op;	1076	myop.op_next = PL_op;
1018	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;	1077	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
1019		1078
1020	PUSHMARK (SP);	1079	PUSHMARK (SP);
1021	EXTEND (SP, 2);	1080	EXTEND (SP, 2);
1022	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));	1081	PUSHs (sv_2mortal (newSViv ((IV)cctx)));
1023	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));	1082	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
1024	PUTBACK;	1083	PUTBACK;
1025	PL_op = (OP *)&myop;	1084	PL_op = (OP *)&myop;
1026	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	1085	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
1027	SPAGAIN;	1086	SPAGAIN;
1028	}	1087	}
1029		1088
		1089	/* the tail of transfer: execute stuff we can only do after a transfer */
		1090	INLINE void
		1091	transfer_tail (pTHX)
		1092	{
		1093	struct coro *next = (struct coro *)transfer_next;
		1094	assert (!(transfer_next = 0)); /* just used for the side effect when asserts are enabled */
		1095	assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));
		1096
		1097	free_coro_mortal (aTHX);
		1098	UNLOCK;
		1099
		1100	if (expect_false (next->throw))
		1101	{
		1102	SV *exception = sv_2mortal (next->throw);
		1103
		1104	next->throw = 0;
		1105	sv_setsv (ERRSV, exception);
		1106	croak (0);
		1107	}
		1108	}
		1109
1030	/*	1110	/*
1031	* this is a _very_ stripped down perl interpreter ;)	1111	* this is a _very_ stripped down perl interpreter ;)
1032	*/	1112	*/
1033	static void	1113	static void
1034	cctx_run (void *arg)	1114	cctx_run (void *arg)
1035	{	1115	{
		1116	#ifdef USE_ITHREADS
		1117	# if CORO_PTHREAD
		1118	PERL_SET_CONTEXT (coro_thx);
		1119	# endif
		1120	#endif
		1121	{
1036	dTHX;	1122	dTHX;
1037		1123
1038	/* cctx_run is the alternative tail of transfer(), so unlock here. */	1124	/* normally we would need to skip the entersub here */
1039	UNLOCK;	1125	/* not doing so will re-execute it, which is exactly what we want */
1040
1041	/* we now skip the entersub that lead to transfer() */
1042	PL_op = PL_op->op_next;	1126	/* PL_nop = PL_nop->op_next */
1043		1127
1044	/* inject a fake subroutine call to cctx_init */	1128	/* inject a fake subroutine call to cctx_init */
1045	cctx_prepare (aTHX_ (coro_cctx *)arg);	1129	cctx_prepare (aTHX_ (coro_cctx *)arg);
1046		1130
		1131	/* cctx_run is the alternative tail of transfer() */
		1132	/* TODO: throwing an exception here might be deadly, VERIFY */
		1133	transfer_tail (aTHX);
		1134
1047	/* somebody or something will hit me for both perl_run and PL_restartop */	1135	/* somebody or something will hit me for both perl_run and PL_restartop */
1048	PL_restartop = PL_op;	1136	PL_restartop = PL_op;
1049	perl_run (PL_curinterp);	1137	perl_run (PL_curinterp);
1050		1138
1051	/*	1139	/*
1052	* If perl-run returns we assume exit() was being called or the coro	1140	* If perl-run returns we assume exit() was being called or the coro
1053	* fell off the end, which seems to be the only valid (non-bug)	1141	* fell off the end, which seems to be the only valid (non-bug)
1054	* reason for perl_run to return. We try to exit by jumping to the	1142	* reason for perl_run to return. We try to exit by jumping to the
1055	* bootstrap-time "top" top_env, as we cannot restore the "main"	1143	* bootstrap-time "top" top_env, as we cannot restore the "main"
1056	* coroutine as Coro has no such concept	1144	* coroutine as Coro has no such concept
1057	*/	1145	*/
1058	PL_top_env = main_top_env;	1146	PL_top_env = main_top_env;
1059	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */	1147	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		1148	}
1060	}	1149	}
1061		1150
1062	static coro_cctx *	1151	static coro_cctx *
1063	cctx_new ()	1152	cctx_new ()
1064	{	1153	{
1065	coro_cctx *cctx;	1154	coro_cctx *cctx;
		1155
		1156	++cctx_count;
		1157	New (0, cctx, 1, coro_cctx);
		1158
		1159	cctx->gen = cctx_gen;
		1160	cctx->flags = 0;
		1161	cctx->idle_sp = 0; /* can be accessed by transfer between cctx_run and set_stacklevel, on throw */
		1162
		1163	return cctx;
		1164	}
		1165
		1166	/* create a new cctx only suitable as source */
		1167	static coro_cctx *
		1168	cctx_new_empty ()
		1169	{
		1170	coro_cctx *cctx = cctx_new ();
		1171
		1172	cctx->sptr = 0;
		1173	coro_create (&cctx->cctx, 0, 0, 0, 0);
		1174
		1175	return cctx;
		1176	}
		1177
		1178	/* create a new cctx suitable as destination/running a perl interpreter */
		1179	static coro_cctx *
		1180	cctx_new_run ()
		1181	{
		1182	coro_cctx *cctx = cctx_new ();
1066	void *stack_start;	1183	void *stack_start;
1067	size_t stack_size;	1184	size_t stack_size;
1068		1185
1069	++cctx_count;
1070
1071	Newz (0, cctx, 1, coro_cctx);
1072
1073	#if HAVE_MMAP	1186	#if HAVE_MMAP
1074	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;	1187	cctx->ssize = ((cctx_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1075	/* mmap supposedly does allocate-on-write for us */	1188	/* mmap supposedly does allocate-on-write for us */
1076	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	1189	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1077		1190
1078	if (cctx->sptr != (void *)-1)	1191	if (cctx->sptr != (void *)-1)
1079	{	1192	{
1080	# if CORO_STACKGUARD	1193	#if CORO_STACKGUARD
1081	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);	1194	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1082	# endif	1195	#endif
1083	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;	1196	stack_start = (char *)cctx->sptr + CORO_STACKGUARD * PAGESIZE;
1084	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;	1197	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1085	cctx->flags |= CC_MAPPED;	1198	cctx->flags |= CC_MAPPED;
1086	}	1199	}
1087	else	1200	else
1088	#endif	1201	#endif
1089	{	1202	{
1090	cctx->ssize = coro_stacksize * (long)sizeof (long);	1203	cctx->ssize = cctx_stacksize * (long)sizeof (long);
1091	New (0, cctx->sptr, coro_stacksize, long);	1204	New (0, cctx->sptr, cctx_stacksize, long);
1092		1205
1093	if (!cctx->sptr)	1206	if (!cctx->sptr)
1094	{	1207	{
1095	perror ("FATAL: unable to allocate stack for coroutine");	1208	perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1096	_exit (EXIT_FAILURE);	1209	_exit (EXIT_FAILURE);
1097	}	1210	}
1098		1211
1099	stack_start = cctx->sptr;	1212	stack_start = cctx->sptr;
1100	stack_size = cctx->ssize;	1213	stack_size = cctx->ssize;
1101	}	1214	}
1102		1215
1103	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);	1216	#if CORO_USE_VALGRIND
		1217	cctx->valgrind_id = VALGRIND_STACK_REGISTER ((char *)stack_start, (char *)stack_start + stack_size);
		1218	#endif
		1219
1104	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);	1220	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1105		1221
1106	return cctx;	1222	return cctx;
1107	}	1223	}
1108		1224
…		…
1111	{	1227	{
1112	if (!cctx)	1228	if (!cctx)
1113	return;	1229	return;
1114		1230
1115	--cctx_count;	1231	--cctx_count;
		1232	coro_destroy (&cctx->cctx);
1116		1233
		1234	/* coro_transfer creates new, empty cctx's */
		1235	if (cctx->sptr)
		1236	{
1117	#if CORO_USE_VALGRIND	1237	#if CORO_USE_VALGRIND
1118	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);	1238	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1119	#endif	1239	#endif
1120		1240
1121	#if HAVE_MMAP	1241	#if HAVE_MMAP
1122	if (cctx->flags & CC_MAPPED)	1242	if (cctx->flags & CC_MAPPED)
1123	munmap (cctx->sptr, cctx->ssize);	1243	munmap (cctx->sptr, cctx->ssize);
1124	else	1244	else
1125	#endif	1245	#endif
1126	Safefree (cctx->sptr);	1246	Safefree (cctx->sptr);
		1247	}
1127		1248
1128	Safefree (cctx);	1249	Safefree (cctx);
1129	}	1250	}
1130		1251
1131	/* wether this cctx should be destructed */	1252	/* wether this cctx should be destructed */
1132	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))	1253	#define CCTX_EXPIRED(cctx) ((cctx)->gen != cctx_gen || ((cctx)->flags & CC_NOREUSE))
1133		1254
1134	static coro_cctx *	1255	static coro_cctx *
1135	cctx_get (pTHX)	1256	cctx_get (pTHX)
1136	{	1257	{
1137	while (expect_true (cctx_first))	1258	while (expect_true (cctx_first))
…		…
1144	return cctx;	1265	return cctx;
1145		1266
1146	cctx_destroy (cctx);	1267	cctx_destroy (cctx);
1147	}	1268	}
1148		1269
1149	return cctx_new ();	1270	return cctx_new_run ();
1150	}	1271	}
1151		1272
1152	static void	1273	static void
1153	cctx_put (coro_cctx *cctx)	1274	cctx_put (coro_cctx *cctx)
1154	{	1275	{
		1276	assert (("FATAL: cctx_put called on non-initialised cctx in Coro (please report)", cctx->sptr));
		1277
1155	/* free another cctx if overlimit */	1278	/* free another cctx if overlimit */
1156	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))	1279	if (expect_false (cctx_idle >= cctx_max_idle))
1157	{	1280	{
1158	coro_cctx *first = cctx_first;	1281	coro_cctx *first = cctx_first;
1159	cctx_first = first->next;	1282	cctx_first = first->next;
1160	--cctx_idle;	1283	--cctx_idle;
1161		1284
…		…
1173	transfer_check (pTHX_ struct coro *prev, struct coro *next)	1296	transfer_check (pTHX_ struct coro *prev, struct coro *next)
1174	{	1297	{
1175	if (expect_true (prev != next))	1298	if (expect_true (prev != next))
1176	{	1299	{
1177	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))	1300	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1178	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");	1301	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1179		1302
1180	if (expect_false (next->flags & CF_RUNNING))	1303	if (expect_false (next->flags & CF_RUNNING))
1181	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");	1304	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1182		1305
1183	if (expect_false (next->flags & CF_DESTROYED))	1306	if (expect_false (next->flags & CF_DESTROYED))
1184	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");	1307	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1185		1308
1186	#if !PERL_VERSION_ATLEAST (5,10,0)	1309	#if !PERL_VERSION_ATLEAST (5,10,0)
1187	if (expect_false (PL_lex_state != LEX_NOTPARSING))	1310	if (expect_false (PL_lex_state != LEX_NOTPARSING))
1188	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version");	1311	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1189	#endif	1312	#endif
1190	}	1313	}
1191	}	1314	}
1192		1315
1193	/* always use the TRANSFER macro */	1316	/* always use the TRANSFER macro */
1194	static void NOINLINE	1317	static void NOINLINE
1195	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)	1318	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1196	{	1319	{
1197	dSTACKLEVEL;	1320	dSTACKLEVEL;
1198	static volatile int has_throw;
1199		1321
1200	/* sometimes transfer is only called to set idle_sp */	1322	/* sometimes transfer is only called to set idle_sp */
1201	if (expect_false (!next))	1323	if (expect_false (!next))
1202	{	1324	{
1203	((coro_cctx *)prev)->idle_sp = STACKLEVEL;	1325	((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1204	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */	1326	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1205	}	1327	}
1206	else if (expect_true (prev != next))	1328	else if (expect_true (prev != next))
1207	{	1329	{
1208	coro_cctx *prev__cctx;	1330	coro_cctx *prev__cctx;
1209		1331
1210	if (expect_false (prev->flags & CF_NEW))	1332	if (expect_false (prev->flags & CF_NEW))
1211	{	1333	{
1212	/* create a new empty context */	1334	/* create a new empty/source context */
1213	Newz (0, prev->cctx, 1, coro_cctx);	1335	prev->cctx = cctx_new_empty ();
1214	prev->flags &= ~CF_NEW;	1336	prev->flags &= ~CF_NEW;
1215	prev->flags |= CF_RUNNING;	1337	prev->flags |= CF_RUNNING;
1216	}	1338	}
1217		1339
1218	prev->flags &= ~CF_RUNNING;	1340	prev->flags &= ~CF_RUNNING;
…		…
1233	else	1355	else
1234	load_perl (aTHX_ next);	1356	load_perl (aTHX_ next);
1235		1357
1236	prev__cctx = prev->cctx;	1358	prev__cctx = prev->cctx;
1237		1359
1238	/* possibly "free" the cctx */	1360	/* possibly untie and reuse the cctx */
1239	if (expect_true (	1361	if (expect_true (
1240	prev__cctx->idle_sp == STACKLEVEL	1362	prev__cctx->idle_sp == (void *)stacklevel
1241	&& !(prev__cctx->flags & CC_TRACE)	1363	&& !(prev__cctx->flags & CC_TRACE)
1242	&& !force_cctx	1364	&& !force_cctx
1243	))	1365	))
1244	{	1366	{
1245	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */	1367	/* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1246	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));	1368	assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));
1247		1369
1248	prev->cctx = 0;	1370	prev->cctx = 0;
1249		1371
1250	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */	1372	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
1251	/* without this the next cctx_get might destroy the prev__cctx while still in use */	1373	/* without this the next cctx_get might destroy the prev__cctx while still in use */
…		…
1259	++next->usecount;	1381	++next->usecount;
1260		1382
1261	if (expect_true (!next->cctx))	1383	if (expect_true (!next->cctx))
1262	next->cctx = cctx_get (aTHX);	1384	next->cctx = cctx_get (aTHX);
1263		1385
1264	has_throw = !!next->throw;	1386	assert (("FATAL: transfer_next already nonzero in Coro (please report)", !transfer_next));
		1387	transfer_next = next;
1265		1388
1266	if (expect_false (prev__cctx != next->cctx))	1389	if (expect_false (prev__cctx != next->cctx))
1267	{	1390	{
1268	prev__cctx->top_env = PL_top_env;	1391	prev__cctx->top_env = PL_top_env;
1269	PL_top_env = next->cctx->top_env;	1392	PL_top_env = next->cctx->top_env;
1270	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);	1393	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
1271	}	1394	}
1272		1395
1273	free_coro_mortal (aTHX);	1396	transfer_tail (aTHX);
1274	UNLOCK;
1275
1276	if (expect_false (has_throw))
1277	{
1278	struct coro *coro = SvSTATE (coro_current);
1279
1280	if (coro->throw)
1281	{
1282	SV *exception = coro->throw;
1283	coro->throw = 0;
1284	sv_setsv (ERRSV, exception);
1285	croak (0);
1286	}
1287	}
1288	}	1397	}
1289	}	1398	}
1290
1291	struct transfer_args
1292	{
1293	struct coro *prev, *next;
1294	};
1295		1399
1296	#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))	1400	#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
1297	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)	1401	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1298		1402
1299	/** high level stuff ********************************************************/	1403	/** high level stuff ********************************************************/
…		…
1319		1423
1320	if (coro->mainstack && coro->mainstack != main_mainstack)	1424	if (coro->mainstack && coro->mainstack != main_mainstack)
1321	{	1425	{
1322	struct coro temp;	1426	struct coro temp;
1323		1427
1324	if (coro->flags & CF_RUNNING)	1428	assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1325	croak ("FATAL: tried to destroy currently running coroutine");
1326		1429
1327	save_perl (aTHX_ &temp);	1430	save_perl (aTHX_ &temp);
1328	load_perl (aTHX_ coro);	1431	load_perl (aTHX_ coro);
1329		1432
1330	coro_destroy (aTHX_ coro);	1433	coro_destruct (aTHX_ coro);
1331		1434
1332	load_perl (aTHX_ &temp);	1435	load_perl (aTHX_ &temp);
1333		1436
1334	coro->slot = 0;	1437	coro->slot = 0;
1335	}	1438	}
…		…
1381	# define MGf_DUP 0	1484	# define MGf_DUP 0
1382	#endif	1485	#endif
1383	};	1486	};
1384		1487
1385	static void	1488	static void
1386	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)	1489	prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1387	{	1490	{
1388	ta->prev = SvSTATE (prev_sv);	1491	ta->prev = SvSTATE (prev_sv);
1389	ta->next = SvSTATE (next_sv);	1492	ta->next = SvSTATE (next_sv);
1390	TRANSFER_CHECK (*ta);	1493	TRANSFER_CHECK (*ta);
1391	}	1494	}
1392		1495
1393	static void	1496	static void
1394	api_transfer (SV *prev_sv, SV *next_sv)	1497	api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1395	{	1498	{
1396	dTHX;
1397	struct transfer_args ta;	1499	struct coro_transfer_args ta;
1398		1500
1399	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);	1501	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1400	TRANSFER (ta, 1);	1502	TRANSFER (ta, 1);
1401	}	1503	}
1402		1504
…		…
1419		1521
1420	return 0;	1522	return 0;
1421	}	1523	}
1422		1524
1423	static int	1525	static int
1424	api_ready (SV *coro_sv)	1526	api_ready (pTHX_ SV *coro_sv)
1425	{	1527	{
1426	dTHX;
1427	struct coro *coro;	1528	struct coro *coro;
1428	SV *sv_hook;	1529	SV *sv_hook;
1429	void (*xs_hook)(void);	1530	void (*xs_hook)(void);
1430		1531
1431	if (SvROK (coro_sv))	1532	if (SvROK (coro_sv))
…		…
1441	LOCK;	1542	LOCK;
1442		1543
1443	sv_hook = coro_nready ? 0 : coro_readyhook;	1544	sv_hook = coro_nready ? 0 : coro_readyhook;
1444	xs_hook = coro_nready ? 0 : coroapi.readyhook;	1545	xs_hook = coro_nready ? 0 : coroapi.readyhook;
1445		1546
1446	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));	1547	coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv));
1447	++coro_nready;	1548	++coro_nready;
1448		1549
1449	UNLOCK;	1550	UNLOCK;
1450		1551
1451	if (sv_hook)	1552	if (sv_hook)
…		…
1469		1570
1470	return 1;	1571	return 1;
1471	}	1572	}
1472		1573
1473	static int	1574	static int
1474	api_is_ready (SV *coro_sv)	1575	api_is_ready (pTHX_ SV *coro_sv)
1475	{	1576	{
1476	dTHX;
1477	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1577	return !!(SvSTATE (coro_sv)->flags & CF_READY);
1478	}	1578	}
1479		1579
1480	static void	1580	INLINE void
1481	prepare_schedule (pTHX_ struct transfer_args *ta)	1581	prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1482	{	1582	{
1483	SV *prev_sv, *next_sv;	1583	SV *prev_sv, *next_sv;
1484		1584
1485	for (;;)	1585	for (;;)
1486	{	1586	{
…		…
1511	/* cannot transfer to destroyed coros, skip and look for next */	1611	/* cannot transfer to destroyed coros, skip and look for next */
1512	if (expect_false (ta->next->flags & CF_DESTROYED))	1612	if (expect_false (ta->next->flags & CF_DESTROYED))
1513	{	1613	{
1514	UNLOCK;	1614	UNLOCK;
1515	SvREFCNT_dec (next_sv);	1615	SvREFCNT_dec (next_sv);
1516	/* coro_nready is already taken care of by destroy */	1616	/* coro_nready has already been taken care of by destroy */
1517	continue;	1617	continue;
1518	}	1618	}
1519		1619
1520	--coro_nready;	1620	--coro_nready;
1521	UNLOCK;	1621	UNLOCK;
…		…
1524		1624
1525	/* free this only after the transfer */	1625	/* free this only after the transfer */
1526	prev_sv = SvRV (coro_current);	1626	prev_sv = SvRV (coro_current);
1527	ta->prev = SvSTATE (prev_sv);	1627	ta->prev = SvSTATE (prev_sv);
1528	TRANSFER_CHECK (*ta);	1628	TRANSFER_CHECK (*ta);
1529	assert (ta->next->flags & CF_READY);	1629	assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1530	ta->next->flags &= ~CF_READY;	1630	ta->next->flags &= ~CF_READY;
1531	SvRV_set (coro_current, next_sv);	1631	SvRV_set (coro_current, next_sv);
1532		1632
1533	LOCK;	1633	LOCK;
1534	free_coro_mortal (aTHX);	1634	free_coro_mortal (aTHX);
1535	coro_mortal = prev_sv;	1635	coro_mortal = prev_sv;
1536	UNLOCK;	1636	UNLOCK;
1537	}	1637	}
1538		1638
1539	static void	1639	INLINE void
1540	prepare_cede (pTHX_ struct transfer_args *ta)	1640	prepare_cede (pTHX_ struct coro_transfer_args *ta)
1541	{	1641	{
1542	api_ready (coro_current);	1642	api_ready (aTHX_ coro_current);
1543	prepare_schedule (aTHX_ ta);	1643	prepare_schedule (aTHX_ ta);
1544	}	1644	}
1545		1645
		1646	INLINE void
		1647	prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
		1648	{
		1649	SV *prev = SvRV (coro_current);
		1650
		1651	if (coro_nready)
		1652	{
		1653	prepare_schedule (aTHX_ ta);
		1654	api_ready (aTHX_ prev);
		1655	}
		1656	else
		1657	prepare_nop (aTHX_ ta);
		1658	}
		1659
		1660	static void
		1661	api_schedule (pTHX)
		1662	{
		1663	struct coro_transfer_args ta;
		1664
		1665	prepare_schedule (aTHX_ &ta);
		1666	TRANSFER (ta, 1);
		1667	}
		1668
1546	static int	1669	static int
1547	prepare_cede_notself (pTHX_ struct transfer_args *ta)	1670	api_cede (pTHX)
1548	{	1671	{
1549	if (coro_nready)	1672	struct coro_transfer_args ta;
1550	{	1673
1551	SV *prev = SvRV (coro_current);
1552	prepare_schedule (aTHX_ ta);	1674	prepare_cede (aTHX_ &ta);
1553	api_ready (prev);	1675
		1676	if (expect_true (ta.prev != ta.next))
		1677	{
		1678	TRANSFER (ta, 1);
1554	return 1;	1679	return 1;
1555	}	1680	}
1556	else	1681	else
1557	return 0;	1682	return 0;
1558	}	1683	}
1559		1684
1560	static void
1561	api_schedule (void)
1562	{
1563	dTHX;
1564	struct transfer_args ta;
1565
1566	prepare_schedule (aTHX_ &ta);
1567	TRANSFER (ta, 1);
1568	}
1569
1570	static int	1685	static int
1571	api_cede (void)	1686	api_cede_notself (pTHX)
1572	{	1687	{
1573	dTHX;	1688	if (coro_nready)
		1689	{
1574	struct transfer_args ta;	1690	struct coro_transfer_args ta;
1575		1691
1576	prepare_cede (aTHX_ &ta);	1692	prepare_cede_notself (aTHX_ &ta);
1577
1578	if (expect_true (ta.prev != ta.next))
1579	{
1580	TRANSFER (ta, 1);	1693	TRANSFER (ta, 1);
1581	return 1;	1694	return 1;
1582	}	1695	}
1583	else	1696	else
1584	return 0;	1697	return 0;
1585	}	1698	}
1586		1699
1587	static int	1700	static void
1588	api_cede_notself (void)
1589	{
1590	dTHX;
1591	struct transfer_args ta;
1592
1593	if (prepare_cede_notself (aTHX_ &ta))
1594	{
1595	TRANSFER (ta, 1);
1596	return 1;
1597	}
1598	else
1599	return 0;
1600	}
1601
1602	static void
1603	api_trace (SV *coro_sv, int flags)	1701	api_trace (pTHX_ SV *coro_sv, int flags)
1604	{	1702	{
1605	dTHX;
1606	struct coro *coro = SvSTATE (coro_sv);	1703	struct coro *coro = SvSTATE (coro_sv);
1607		1704
1608	if (flags & CC_TRACE)	1705	if (flags & CC_TRACE)
1609	{	1706	{
1610	if (!coro->cctx)	1707	if (!coro->cctx)
1611	coro->cctx = cctx_new ();	1708	coro->cctx = cctx_new_run ();
1612	else if (!(coro->cctx->flags & CC_TRACE))	1709	else if (!(coro->cctx->flags & CC_TRACE))
1613	croak ("cannot enable tracing on coroutine with custom stack");	1710	croak ("cannot enable tracing on coroutine with custom stack,");
1614		1711
1615	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));	1712	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1616	}	1713	}
1617	else if (coro->cctx && coro->cctx->flags & CC_TRACE)	1714	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1618	{	1715	{
…		…
1623	else	1720	else
1624	coro->slot->runops = RUNOPS_DEFAULT;	1721	coro->slot->runops = RUNOPS_DEFAULT;
1625	}	1722	}
1626	}	1723	}
1627		1724
		1725	/*****************************************************************************/
		1726	/* PerlIO::cede */
		1727
		1728	typedef struct
		1729	{
		1730	PerlIOBuf base;
		1731	NV next, every;
		1732	} PerlIOCede;
		1733
		1734	static IV
		1735	PerlIOCede_pushed (pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
		1736	{
		1737	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
		1738
		1739	self->every = SvCUR (arg) ? SvNV (arg) : 0.01;
		1740	self->next = nvtime () + self->every;
		1741
		1742	return PerlIOBuf_pushed (aTHX_ f, mode, Nullsv, tab);
		1743	}
		1744
		1745	static SV *
		1746	PerlIOCede_getarg (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
		1747	{
		1748	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
		1749
		1750	return newSVnv (self->every);
		1751	}
		1752
		1753	static IV
		1754	PerlIOCede_flush (pTHX_ PerlIO *f)
		1755	{
		1756	PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
		1757	double now = nvtime ();
		1758
		1759	if (now >= self->next)
		1760	{
		1761	api_cede (aTHX);
		1762	self->next = now + self->every;
		1763	}
		1764
		1765	return PerlIOBuf_flush (aTHX_ f);
		1766	}
		1767
		1768	static PerlIO_funcs PerlIO_cede =
		1769	{
		1770	sizeof(PerlIO_funcs),
		1771	"cede",
		1772	sizeof(PerlIOCede),
		1773	PERLIO_K_DESTRUCT | PERLIO_K_RAW,
		1774	PerlIOCede_pushed,
		1775	PerlIOBuf_popped,
		1776	PerlIOBuf_open,
		1777	PerlIOBase_binmode,
		1778	PerlIOCede_getarg,
		1779	PerlIOBase_fileno,
		1780	PerlIOBuf_dup,
		1781	PerlIOBuf_read,
		1782	PerlIOBuf_unread,
		1783	PerlIOBuf_write,
		1784	PerlIOBuf_seek,
		1785	PerlIOBuf_tell,
		1786	PerlIOBuf_close,
		1787	PerlIOCede_flush,
		1788	PerlIOBuf_fill,
		1789	PerlIOBase_eof,
		1790	PerlIOBase_error,
		1791	PerlIOBase_clearerr,
		1792	PerlIOBase_setlinebuf,
		1793	PerlIOBuf_get_base,
		1794	PerlIOBuf_bufsiz,
		1795	PerlIOBuf_get_ptr,
		1796	PerlIOBuf_get_cnt,
		1797	PerlIOBuf_set_ptrcnt,
		1798	};
		1799
		1800	/*****************************************************************************/
		1801
		1802	static const CV *slf_cv; /* for quick consistency check */
		1803
		1804	static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
		1805	static SV *slf_arg0;
		1806	static SV *slf_arg1;
		1807	static SV *slf_arg2;
		1808
		1809	/* this restores the stack in the case we patched the entersub, to */
		1810	/* recreate the stack frame as perl will on following calls */
		1811	/* since entersub cleared the stack */
		1812	static OP *
		1813	pp_restore (pTHX)
		1814	{
		1815	dSP;
		1816
		1817	PUSHMARK (SP);
		1818
		1819	EXTEND (SP, 3);
		1820	if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));
		1821	if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));
		1822	if (slf_arg2) PUSHs (sv_2mortal (slf_arg2));
		1823	PUSHs ((SV *)CvGV (slf_cv));
		1824
		1825	RETURNOP (slf_restore.op_first);
		1826	}
		1827
		1828	static void
		1829	slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
		1830	{
		1831	prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
		1832	}
		1833
		1834	static void
		1835	slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		1836	{
		1837	assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
		1838
		1839	frame->prepare = slf_prepare_set_stacklevel;
		1840	frame->check = slf_check_nop;
		1841	frame->data = (void *)SvIV (arg [0]);
		1842	}
		1843
		1844	static void
		1845	slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
		1846	{
		1847	SV **arg = (SV **)slf_frame.data;
		1848
		1849	prepare_transfer (aTHX_ ta, arg [0], arg [1]);
		1850	}
		1851
		1852	static void
		1853	slf_init_transfer (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		1854	{
		1855	if (items != 2)
		1856	croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
		1857
		1858	frame->prepare = slf_prepare_transfer;
		1859	frame->check = slf_check_nop;
		1860	frame->data = (void *)arg; /* let's hope it will stay valid */
		1861	}
		1862
		1863	static void
		1864	slf_init_schedule (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		1865	{
		1866	frame->prepare = prepare_schedule;
		1867	frame->check = slf_check_nop;
		1868	}
		1869
		1870	static void
		1871	slf_init_cede (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		1872	{
		1873	frame->prepare = prepare_cede;
		1874	frame->check = slf_check_nop;
		1875	}
		1876
		1877	static void
		1878	slf_init_cede_notself (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		1879	{
		1880	frame->prepare = prepare_cede_notself;
		1881	frame->check = slf_check_nop;
		1882	}
		1883
		1884	/* we hijack an hopefully unused CV flag for our purposes */
		1885	#define CVf_SLF 0x4000
		1886
		1887	/*
		1888	* these not obviously related functions are all rolled into one
		1889	* function to increase chances that they all will call transfer with the same
		1890	* stack offset
		1891	* SLF stands for "schedule-like-function".
		1892	*/
		1893	static OP *
		1894	pp_slf (pTHX)
		1895	{
		1896	I32 checkmark; /* mark SP to see how many elements check has pushed */
		1897
		1898	/* set up the slf frame, unless it has already been set-up */
		1899	/* the latter happens when a new coro has been started */
		1900	/* or when a new cctx was attached to an existing coroutine */
		1901	if (expect_true (!slf_frame.prepare))
		1902	{
		1903	/* first iteration */
		1904	dSP;
		1905	SV **arg = PL_stack_base + TOPMARK + 1;
		1906	int items = SP - arg; /* args without function object */
		1907	SV *gv = *sp;
		1908
		1909	/* do a quick consistency check on the "function" object, and if it isn't */
		1910	/* for us, divert to the real entersub */
		1911	if (SvTYPE (gv) != SVt_PVGV || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
		1912	return PL_ppaddr[OP_ENTERSUB](aTHX);
		1913
		1914	/* pop args */
		1915	SP = PL_stack_base + POPMARK;
		1916
		1917	if (!(PL_op->op_flags & OPf_STACKED))
		1918	{
		1919	/* ampersand-form of call, use @_ instead of stack */
		1920	AV *av = GvAV (PL_defgv);
		1921	arg = AvARRAY (av);
		1922	items = AvFILLp (av) + 1;
		1923	}
		1924
		1925	PUTBACK;
		1926
		1927	((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr) (aTHX_ &slf_frame, arg, items);
		1928	}
		1929
		1930	/* now interpret the slf_frame */
		1931	/* we use a callback system not to make the code needlessly */
		1932	/* complicated, but so we can run multiple perl coros from one cctx */
		1933
		1934	do
		1935	{
		1936	struct coro_transfer_args ta;
		1937
		1938	slf_frame.prepare (aTHX_ &ta);
		1939	TRANSFER (ta, 0);
		1940
		1941	checkmark = PL_stack_sp - PL_stack_base;
		1942	}
		1943	while (slf_frame.check (aTHX_ &slf_frame));
		1944
		1945	{
		1946	dSP;
		1947	SV **bot = PL_stack_base + checkmark;
		1948	int gimme = GIMME_V;
		1949
		1950	slf_frame.prepare = 0; /* signal pp_slf that we need a new frame */
		1951
		1952	/* make sure we put something on the stack in scalar context */
		1953	if (gimme == G_SCALAR)
		1954	{
		1955	if (sp == bot)
		1956	XPUSHs (&PL_sv_undef);
		1957
		1958	SP = bot + 1;
		1959	}
		1960
		1961	PUTBACK;
		1962	}
		1963
		1964	return NORMAL;
		1965	}
		1966
		1967	static void
		1968	api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, SV **arg, int items)
		1969	{
		1970	assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
		1971
		1972	if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
		1973	&& PL_op->op_ppaddr != pp_slf)
		1974	croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
		1975
		1976	if (items > 3)
		1977	croak ("Coro only supports up to three arguments to SLF functions currently (not %d), caught", items);
		1978
		1979	CvFLAGS (cv) |= CVf_SLF;
		1980	CvXSUBANY (cv).any_ptr = (void *)init_cb;
		1981	slf_cv = cv;
		1982
		1983	/* we patch the op, and then re-run the whole call */
		1984	/* we have to put the same argument on the stack for this to work */
		1985	/* and this will be done by pp_restore */
		1986	slf_restore.op_next = (OP *)&slf_restore;
		1987	slf_restore.op_type = OP_NULL;
		1988	slf_restore.op_ppaddr = pp_restore;
		1989	slf_restore.op_first = PL_op;
		1990
		1991	slf_arg0 = items > 0 ? SvREFCNT_inc (arg [0]) : 0;
		1992	slf_arg1 = items > 1 ? SvREFCNT_inc (arg [1]) : 0;
		1993	slf_arg2 = items > 2 ? SvREFCNT_inc (arg [2]) : 0;
		1994
		1995	PL_op->op_ppaddr = pp_slf;
		1996
		1997	PL_op = (OP *)&slf_restore;
		1998	}
		1999
		2000	/*****************************************************************************/
		2001
		2002	static int
		2003	slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
		2004	{
		2005	AV *av = (AV *)frame->data;
		2006	SV *count_sv = AvARRAY (av)[0];
		2007
		2008	if (SvIVX (count_sv) > 0)
		2009	{
		2010	SvIVX (count_sv) = SvIVX (count_sv) - 1;
		2011	return 0;
		2012	}
		2013	else
		2014	{
		2015	int i;
		2016	/* if we were woken up but can't down, we look through the whole */
		2017	/* waiters list and only add us if we aren't in there already */
		2018	/* this avoids some degenerate memory usage cases */
		2019
		2020	for (i = 1; i <= AvFILLp (av); ++i)
		2021	if (AvARRAY (av)[i] == SvRV (coro_current))
		2022	return 1;
		2023
		2024	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2025	return 1;
		2026	}
		2027	}
		2028
		2029	static void
		2030	slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, SV **arg, int items)
		2031	{
		2032	AV *av = (AV *)SvRV (arg [0]);
		2033
		2034	if (SvIVX (AvARRAY (av)[0]) > 0)
		2035	{
		2036	frame->data = (void *)av;
		2037	frame->prepare = prepare_nop;
		2038	}
		2039	else
		2040	{
		2041	av_push (av, SvREFCNT_inc (SvRV (coro_current)));
		2042
		2043	frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
		2044	frame->prepare = prepare_schedule;
		2045	}
		2046
		2047	frame->check = slf_check_semaphore_down;
		2048
		2049	}
		2050
		2051	/*****************************************************************************/
		2052
		2053	#define GENSUB_ARG CvXSUBANY (cv).any_ptr
		2054
		2055	/* create a closure from XS, returns a code reference */
		2056	/* the arg can be accessed via GENSUB_ARG from the callback */
		2057	/* the callback must use dXSARGS/XSRETURN */
		2058	static SV *
		2059	gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
		2060	{
		2061	CV *cv = (CV *)NEWSV (0, 0);
		2062
		2063	sv_upgrade ((SV *)cv, SVt_PVCV);
		2064
		2065	CvANON_on (cv);
		2066	CvISXSUB_on (cv);
		2067	CvXSUB (cv) = xsub;
		2068	GENSUB_ARG = arg;
		2069
		2070	return newRV_noinc ((SV *)cv);
		2071	}
		2072
		2073	/*****************************************************************************/
		2074
1628	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_	2075	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1629		2076
1630	PROTOTYPES: DISABLE	2077	PROTOTYPES: DISABLE
1631		2078
1632	BOOT:	2079	BOOT:
1633	{	2080	{
1634	#ifdef USE_ITHREADS	2081	#ifdef USE_ITHREADS
1635	MUTEX_INIT (&coro_mutex);	2082	MUTEX_INIT (&coro_lock);
		2083	# if CORO_PTHREAD
		2084	coro_thx = PERL_GET_CONTEXT;
		2085	# endif
1636	#endif	2086	#endif
1637	BOOT_PAGESIZE;	2087	BOOT_PAGESIZE;
1638		2088
1639	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);	2089	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
1640	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);	2090	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
…		…
1658	main_top_env = PL_top_env;	2108	main_top_env = PL_top_env;
1659		2109
1660	while (main_top_env->je_prev)	2110	while (main_top_env->je_prev)
1661	main_top_env = main_top_env->je_prev;	2111	main_top_env = main_top_env->je_prev;
1662		2112
1663	coroapi.ver = CORO_API_VERSION;	2113	coroapi.ver = CORO_API_VERSION;
1664	coroapi.rev = CORO_API_REVISION;	2114	coroapi.rev = CORO_API_REVISION;
		2115
1665	coroapi.transfer = api_transfer;	2116	coroapi.transfer = api_transfer;
		2117
		2118	coroapi.sv_state = SvSTATE_;
		2119	coroapi.execute_slf = api_execute_slf;
		2120	coroapi.prepare_nop = prepare_nop;
		2121	coroapi.prepare_schedule = prepare_schedule;
		2122	coroapi.prepare_cede = prepare_cede;
		2123	coroapi.prepare_cede_notself = prepare_cede_notself;
		2124
		2125	{
		2126	SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
		2127
		2128	if (!svp) croak ("Time::HiRes is required");
		2129	if (!SvIOK (*svp)) croak ("Time::NVtime isn't a function pointer");
		2130
		2131	nvtime = INT2PTR (double (*)(), SvIV (*svp));
		2132	}
1666		2133
1667	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	2134	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1668	}	2135	}
1669		2136
1670	SV *	2137	SV *
…		…
1694	av_push (coro->args, newSVsv (ST (i)));	2161	av_push (coro->args, newSVsv (ST (i)));
1695	}	2162	}
1696	OUTPUT:	2163	OUTPUT:
1697	RETVAL	2164	RETVAL
1698		2165
1699	# these not obviously related functions are all rolled into the same xs
1700	# function to increase chances that they all will call transfer with the same
1701	# stack offset
1702	void	2166	void
1703	_set_stacklevel (...)	2167	_set_stacklevel (...)
1704	ALIAS:	2168	CODE:
1705	Coro::State::transfer = 1	2169	api_execute_slf (aTHX_ cv, slf_init_set_stacklevel, &ST (0), items);
1706	Coro::schedule = 2
1707	Coro::cede = 3
1708	Coro::cede_notself = 4
1709	CODE:
1710	{
1711	struct transfer_args ta;
1712		2170
1713	PUTBACK;	2171	void
1714	switch (ix)	2172	transfer (...)
1715	{	2173	PROTOTYPE: $$
1716	case 0:	2174	CODE:
1717	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));	2175	api_execute_slf (aTHX_ cv, slf_init_transfer, &ST (0), items);
1718	ta.next = 0;
1719	break;
1720
1721	case 1:
1722	if (items != 2)
1723	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1724
1725	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
1726	break;
1727
1728	case 2:
1729	prepare_schedule (aTHX_ &ta);
1730	break;
1731
1732	case 3:
1733	prepare_cede (aTHX_ &ta);
1734	break;
1735
1736	case 4:
1737	if (!prepare_cede_notself (aTHX_ &ta))
1738	XSRETURN_EMPTY;
1739
1740	break;
1741	}
1742	SPAGAIN;
1743
1744	BARRIER;
1745	PUTBACK;
1746	TRANSFER (ta, 0);
1747	SPAGAIN; /* might be the sp of a different coroutine now */
1748	/* be extra careful not to ever do anything after TRANSFER */
1749	}
1750		2176
1751	bool	2177	bool
1752	_destroy (SV *coro_sv)	2178	_destroy (SV *coro_sv)
1753	CODE:	2179	CODE:
1754	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));	2180	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
…		…
1761	CODE:	2187	CODE:
1762	_exit (code);	2188	_exit (code);
1763		2189
1764	int	2190	int
1765	cctx_stacksize (int new_stacksize = 0)	2191	cctx_stacksize (int new_stacksize = 0)
		2192	PROTOTYPE: ;$
1766	CODE:	2193	CODE:
1767	RETVAL = coro_stacksize;	2194	RETVAL = cctx_stacksize;
1768	if (new_stacksize)	2195	if (new_stacksize)
		2196	{
1769	coro_stacksize = new_stacksize;	2197	cctx_stacksize = new_stacksize;
		2198	++cctx_gen;
		2199	}
1770	OUTPUT:	2200	OUTPUT:
1771	RETVAL	2201	RETVAL
1772		2202
1773	int	2203	int
		2204	cctx_max_idle (int max_idle = 0)
		2205	PROTOTYPE: ;$
		2206	CODE:
		2207	RETVAL = cctx_max_idle;
		2208	if (max_idle > 1)
		2209	cctx_max_idle = max_idle;
		2210	OUTPUT:
		2211	RETVAL
		2212
		2213	int
1774	cctx_count ()	2214	cctx_count ()
		2215	PROTOTYPE:
1775	CODE:	2216	CODE:
1776	RETVAL = cctx_count;	2217	RETVAL = cctx_count;
1777	OUTPUT:	2218	OUTPUT:
1778	RETVAL	2219	RETVAL
1779		2220
1780	int	2221	int
1781	cctx_idle ()	2222	cctx_idle ()
		2223	PROTOTYPE:
1782	CODE:	2224	CODE:
1783	RETVAL = cctx_idle;	2225	RETVAL = cctx_idle;
1784	OUTPUT:	2226	OUTPUT:
1785	RETVAL	2227	RETVAL
1786		2228
1787	void	2229	void
1788	list ()	2230	list ()
		2231	PROTOTYPE:
1789	PPCODE:	2232	PPCODE:
1790	{	2233	{
1791	struct coro *coro;	2234	struct coro *coro;
1792	for (coro = coro_first; coro; coro = coro->next)	2235	for (coro = coro_first; coro; coro = coro->next)
1793	if (coro->hv)	2236	if (coro->hv)
…		…
1798	call (Coro::State coro, SV *coderef)	2241	call (Coro::State coro, SV *coderef)
1799	ALIAS:	2242	ALIAS:
1800	eval = 1	2243	eval = 1
1801	CODE:	2244	CODE:
1802	{	2245	{
1803	if (coro->mainstack)	2246	if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
1804	{	2247	{
1805	struct coro temp;	2248	struct coro temp;
1806		2249
1807	if (!(coro->flags & CF_RUNNING))	2250	if (!(coro->flags & CF_RUNNING))
1808	{	2251	{
…		…
1852	RETVAL = boolSV (coro->flags & ix);	2295	RETVAL = boolSV (coro->flags & ix);
1853	OUTPUT:	2296	OUTPUT:
1854	RETVAL	2297	RETVAL
1855		2298
1856	void	2299	void
		2300	throw (Coro::State self, SV *throw = &PL_sv_undef)
		2301	PROTOTYPE: $;$
		2302	CODE:
		2303	SvREFCNT_dec (self->throw);
		2304	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		2305
		2306	void
1857	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)	2307	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		2308	PROTOTYPE: $;$
		2309	C_ARGS: aTHX_ coro, flags
1858		2310
1859	SV *	2311	SV *
1860	has_cctx (Coro::State coro)	2312	has_cctx (Coro::State coro)
1861	PROTOTYPE: $	2313	PROTOTYPE: $
1862	CODE:	2314	CODE:
…		…
1870	CODE:	2322	CODE:
1871	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;	2323	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
1872	OUTPUT:	2324	OUTPUT:
1873	RETVAL	2325	RETVAL
1874		2326
1875	IV	2327	UV
1876	rss (Coro::State coro)	2328	rss (Coro::State coro)
1877	PROTOTYPE: $	2329	PROTOTYPE: $
1878	ALIAS:	2330	ALIAS:
1879	usecount = 1	2331	usecount = 1
1880	CODE:	2332	CODE:
…		…
1886	OUTPUT:	2338	OUTPUT:
1887	RETVAL	2339	RETVAL
1888		2340
1889	void	2341	void
1890	force_cctx ()	2342	force_cctx ()
		2343	PROTOTYPE:
1891	CODE:	2344	CODE:
1892	struct coro *coro = SvSTATE (coro_current);	2345	struct coro *coro = SvSTATE (coro_current);
1893	coro->cctx->idle_sp = 0;	2346	coro->cctx->idle_sp = 0;
		2347
		2348	void
		2349	swap_defsv (Coro::State self)
		2350	PROTOTYPE: $
		2351	ALIAS:
		2352	swap_defav = 1
		2353	CODE:
		2354	if (!self->slot)
		2355	croak ("cannot swap state with coroutine that has no saved state,");
		2356	else
		2357	{
		2358	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
		2359	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
		2360
		2361	SV *tmp = *src; *src = *dst; *dst = tmp;
		2362	}
1894		2363
1895	MODULE = Coro::State PACKAGE = Coro	2364	MODULE = Coro::State PACKAGE = Coro
1896		2365
1897	BOOT:	2366	BOOT:
1898	{	2367	{
…		…
1916		2385
1917	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	2386	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1918	coro_ready[i] = newAV ();	2387	coro_ready[i] = newAV ();
1919		2388
1920	{	2389	{
1921	SV *sv = perl_get_sv ("Coro::API", TRUE);	2390	SV *sv = coro_get_sv (aTHX_ "Coro::API", TRUE);
1922	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
1923		2391
1924	coroapi.schedule = api_schedule;	2392	coroapi.schedule = api_schedule;
1925	coroapi.cede = api_cede;	2393	coroapi.cede = api_cede;
1926	coroapi.cede_notself = api_cede_notself;	2394	coroapi.cede_notself = api_cede_notself;
1927	coroapi.ready = api_ready;	2395	coroapi.ready = api_ready;
1928	coroapi.is_ready = api_is_ready;	2396	coroapi.is_ready = api_is_ready;
1929	coroapi.nready = &coro_nready;	2397	coroapi.nready = coro_nready;
1930	coroapi.current = coro_current;	2398	coroapi.current = coro_current;
1931		2399
1932	GCoroAPI = &coroapi;	2400	GCoroAPI = &coroapi;
1933	sv_setiv (sv, (IV)&coroapi);	2401	sv_setiv (sv, (IV)&coroapi);
1934	SvREADONLY_on (sv);	2402	SvREADONLY_on (sv);
1935	}	2403	}
1936	}	2404	}
		2405
		2406	void
		2407	schedule (...)
		2408	CODE:
		2409	api_execute_slf (aTHX_ cv, slf_init_schedule, &ST (0), 0);
		2410
		2411	void
		2412	cede (...)
		2413	CODE:
		2414	api_execute_slf (aTHX_ cv, slf_init_cede, &ST (0), 0);
		2415
		2416	void
		2417	cede_notself (...)
		2418	CODE:
		2419	api_execute_slf (aTHX_ cv, slf_init_cede_notself, &ST (0), 0);
1937		2420
1938	void	2421	void
1939	_set_current (SV *current)	2422	_set_current (SV *current)
1940	PROTOTYPE: $	2423	PROTOTYPE: $
1941	CODE:	2424	CODE:
1942	SvREFCNT_dec (SvRV (coro_current));	2425	SvREFCNT_dec (SvRV (coro_current));
1943	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));	2426	SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
1944		2427
1945	void	2428	void
1946	_set_readyhook (SV *hook)	2429	_set_readyhook (SV *hook)
1947	PROTOTYPE: $	2430	PROTOTYPE: $
1948	CODE:	2431	CODE:
…		…
1951	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;	2434	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
1952	UNLOCK;	2435	UNLOCK;
1953		2436
1954	int	2437	int
1955	prio (Coro::State coro, int newprio = 0)	2438	prio (Coro::State coro, int newprio = 0)
		2439	PROTOTYPE: $;$
1956	ALIAS:	2440	ALIAS:
1957	nice = 1	2441	nice = 1
1958	CODE:	2442	CODE:
1959	{	2443	{
1960	RETVAL = coro->prio;	2444	RETVAL = coro->prio;
…		…
1975		2459
1976	SV *	2460	SV *
1977	ready (SV *self)	2461	ready (SV *self)
1978	PROTOTYPE: $	2462	PROTOTYPE: $
1979	CODE:	2463	CODE:
1980	RETVAL = boolSV (api_ready (self));	2464	RETVAL = boolSV (api_ready (aTHX_ self));
1981	OUTPUT:	2465	OUTPUT:
1982	RETVAL	2466	RETVAL
1983		2467
1984	int	2468	int
1985	nready (...)	2469	nready (...)
…		…
1987	CODE:	2471	CODE:
1988	RETVAL = coro_nready;	2472	RETVAL = coro_nready;
1989	OUTPUT:	2473	OUTPUT:
1990	RETVAL	2474	RETVAL
1991		2475
1992	void
1993	throw (Coro::State self, SV *throw = &PL_sv_undef)
1994	PROTOTYPE: $;$
1995	CODE:
1996	SvREFCNT_dec (self->throw);
1997	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
1998
1999	void
2000	swap_defsv (Coro::State self)
2001	PROTOTYPE: $
2002	ALIAS:
2003	swap_defav = 1
2004	CODE:
2005	if (!self->slot)
2006	croak ("cannot swap state with coroutine that has no saved state");
2007	else
2008	{
2009	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2010	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
2011
2012	SV *tmp = *src; *src = *dst; *dst = tmp;
2013	}
2014
2015	# for async_pool speedup	2476	# for async_pool speedup
2016	void	2477	void
2017	_pool_1 (SV *cb)	2478	_pool_1 (SV *cb)
2018	CODE:	2479	CODE:
2019	{	2480	{
…		…
2031	SvREFCNT_dec (old);	2492	SvREFCNT_dec (old);
2032	croak ("\3async_pool terminate\2\n");	2493	croak ("\3async_pool terminate\2\n");
2033	}	2494	}
2034		2495
2035	SvREFCNT_dec (coro->saved_deffh);	2496	SvREFCNT_dec (coro->saved_deffh);
2036	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);	2497	coro->saved_deffh = SvREFCNT_inc_NN ((SV *)PL_defoutgv);
2037		2498
2038	hv_store (hv, "desc", sizeof ("desc") - 1,	2499	hv_store (hv, "desc", sizeof ("desc") - 1,
2039	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);	2500	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
2040		2501
2041	invoke_av = (AV *)SvRV (invoke);	2502	invoke_av = (AV *)SvRV (invoke);
…		…
2045		2506
2046	if (len > 0)	2507	if (len > 0)
2047	{	2508	{
2048	av_fill (defav, len - 1);	2509	av_fill (defav, len - 1);
2049	for (i = 0; i < len; ++i)	2510	for (i = 0; i < len; ++i)
2050	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));	2511	av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2051	}	2512	}
2052
2053	SvREFCNT_dec (invoke);
2054	}	2513	}
2055		2514
2056	void	2515	void
2057	_pool_2 (SV *cb)	2516	_pool_2 (SV *cb)
2058	CODE:	2517	CODE:
…		…
2062	sv_setsv (cb, &PL_sv_undef);	2521	sv_setsv (cb, &PL_sv_undef);
2063		2522
2064	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;	2523	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2065	coro->saved_deffh = 0;	2524	coro->saved_deffh = 0;
2066		2525
2067	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)	2526	if (coro_rss (aTHX_ coro) > SvUV (sv_pool_rss)
2068	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))	2527	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
2069	{	2528	{
2070	SV *old = PL_diehook;	2529	SV *old = PL_diehook;
2071	PL_diehook = 0;	2530	PL_diehook = 0;
2072	SvREFCNT_dec (old);	2531	SvREFCNT_dec (old);
…		…
2078	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);	2537	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2079		2538
2080	coro->prio = 0;	2539	coro->prio = 0;
2081		2540
2082	if (coro->cctx && (coro->cctx->flags & CC_TRACE))	2541	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2083	api_trace (coro_current, 0);	2542	api_trace (aTHX_ coro_current, 0);
2084		2543
2085	av_push (av_async_pool, newSVsv (coro_current));	2544	av_push (av_async_pool, newSVsv (coro_current));
2086	}	2545	}
2087		2546
2088		2547
2089	MODULE = Coro::State PACKAGE = Coro::AIO	2548	MODULE = Coro::State PACKAGE = Coro::AIO
2090		2549
2091	SV *	2550	void
2092	_get_state ()	2551	_get_state (SV *self)
		2552	PROTOTYPE: $
2093	CODE:	2553	PPCODE:
2094	{	2554	{
2095	struct io_state *data;	2555	AV *defav = GvAV (PL_defgv);
2096		2556	AV *av = newAV ();
		2557	int i;
2097	RETVAL = newSV (sizeof (struct io_state));	2558	SV *data_sv = newSV (sizeof (struct io_state));
2098	data = (struct io_state *)SvPVX (RETVAL);	2559	struct io_state *data = (struct io_state *)SvPVX (data_sv);
2099	SvCUR_set (RETVAL, sizeof (struct io_state));	2560	SvCUR_set (data_sv, sizeof (struct io_state));
2100	SvPOK_only (RETVAL);	2561	SvPOK_only (data_sv);
2101		2562
2102	data->errorno = errno;	2563	data->errorno = errno;
2103	data->laststype = PL_laststype;	2564	data->laststype = PL_laststype;
2104	data->laststatval = PL_laststatval;	2565	data->laststatval = PL_laststatval;
2105	data->statcache = PL_statcache;	2566	data->statcache = PL_statcache;
		2567
		2568	av_extend (av, AvFILLp (defav) + 1 + 1);
		2569
		2570	for (i = 0; i <= AvFILLp (defav); ++i)
		2571	av_push (av, SvREFCNT_inc_NN (AvARRAY (defav)[i]));
		2572
		2573	av_push (av, data_sv);
		2574
		2575	XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		2576
		2577	api_ready (aTHX_ self);
2106	}	2578	}
2107	OUTPUT:
2108	RETVAL
2109		2579
2110	void	2580	void
2111	_set_state (char *data_)	2581	_set_state (SV *state)
2112	PROTOTYPE: $	2582	PROTOTYPE: $
2113	CODE:	2583	PPCODE:
2114	{	2584	{
2115	struct io_state *data = (void *)data_;	2585	AV *av = (AV *)SvRV (state);
		2586	struct io_state *data = (struct io_state *)SvPVX (AvARRAY (av)[AvFILLp (av)]);
		2587	int i;
2116		2588
2117	errno = data->errorno;	2589	errno = data->errorno;
2118	PL_laststype = data->laststype;	2590	PL_laststype = data->laststype;
2119	PL_laststatval = data->laststatval;	2591	PL_laststatval = data->laststatval;
2120	PL_statcache = data->statcache;	2592	PL_statcache = data->statcache;
		2593
		2594	EXTEND (SP, AvFILLp (av));
		2595	for (i = 0; i < AvFILLp (av); ++i)
		2596	PUSHs (sv_2mortal (SvREFCNT_inc_NN (AvARRAY (av)[i])));
2121	}	2597	}
2122		2598
2123		2599
2124	MODULE = Coro::State PACKAGE = Coro::AnyEvent	2600	MODULE = Coro::State PACKAGE = Coro::AnyEvent
2125		2601
2126	BOOT:	2602	BOOT:
2127	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);	2603	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2128		2604
2129	SV *	2605	void
2130	_schedule (...)	2606	_schedule (...)
2131	PROTOTYPE: @
2132	CODE:	2607	CODE:
2133	{	2608	{
2134	static int incede;	2609	static int incede;
2135		2610
2136	api_cede_notself ();	2611	api_cede_notself (aTHX);
2137		2612
2138	++incede;	2613	++incede;
2139	while (coro_nready >= incede && api_cede ())	2614	while (coro_nready >= incede && api_cede (aTHX))
2140	;	2615	;
2141		2616
2142	sv_setsv (sv_activity, &PL_sv_undef);	2617	sv_setsv (sv_activity, &PL_sv_undef);
2143	if (coro_nready >= incede)	2618	if (coro_nready >= incede)
2144	{	2619	{
…		…
2149	}	2624	}
2150		2625
2151	--incede;	2626	--incede;
2152	}	2627	}
2153		2628
		2629
		2630	MODULE = Coro::State PACKAGE = PerlIO::cede
		2631
		2632	BOOT:
		2633	PerlIO_define_layer (aTHX_ &PerlIO_cede);
		2634
		2635	MODULE = Coro::State PACKAGE = Coro::Semaphore
		2636
		2637	SV *
		2638	new (SV *klass, SV *count_ = 0)
		2639	CODE:
		2640	{
		2641	/* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
		2642	AV *av = newAV ();
		2643	av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
		2644	RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
		2645	}
		2646	OUTPUT:
		2647	RETVAL
		2648
		2649	SV *
		2650	count (SV *self)
		2651	CODE:
		2652	RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
		2653	OUTPUT:
		2654	RETVAL
		2655
		2656	void
		2657	up (SV *self, int adjust = 1)
		2658	ALIAS:
		2659	adjust = 1
		2660	CODE:
		2661	{
		2662	AV *av = (AV *)SvRV (self);
		2663	SV *count_sv = AvARRAY (av)[0];
		2664	IV count = SvIVX (count_sv);
		2665
		2666	count += ix ? adjust : 1;
		2667	SvIVX (count_sv) = count;
		2668
		2669	/* now wake up as many waiters as possible */
		2670	while (count > 0 && AvFILLp (av) >= count)
		2671	{
		2672	SV *cb;
		2673
		2674	/* swap first two elements so we can shift a waiter */
		2675	AvARRAY (av)[0] = AvARRAY (av)[1];
		2676	AvARRAY (av)[1] = count_sv;
		2677	cb = av_shift (av);
		2678
		2679	if (SvOBJECT (cb))
		2680	api_ready (aTHX_ cb);
		2681	else
		2682	croak ("callbacks not yet supported");
		2683
		2684	SvREFCNT_dec (cb);
		2685	}
		2686	}
		2687
		2688	void
		2689	down (SV *self)
		2690	CODE:
		2691	api_execute_slf (aTHX_ cv, slf_init_semaphore_down, &ST (0), 1);
		2692
		2693	void
		2694	try (SV *self)
		2695	PPCODE:
		2696	{
		2697	AV *av = (AV *)SvRV (self);
		2698	SV *count_sv = AvARRAY (av)[0];
		2699	IV count = SvIVX (count_sv);
		2700
		2701	if (count > 0)
		2702	{
		2703	--count;
		2704	SvIVX (count_sv) = count;
		2705	XSRETURN_YES;
		2706	}
		2707	else
		2708	XSRETURN_NO;
		2709	}
		2710
		2711	void
		2712	waiters (SV *self)
		2713	CODE:
		2714	{
		2715	AV *av = (AV *)SvRV (self);
		2716
		2717	if (GIMME_V == G_SCALAR)
		2718	XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
		2719	else
		2720	{
		2721	int i;
		2722	EXTEND (SP, AvFILLp (av) + 1 - 1);
		2723	for (i = 1; i <= AvFILLp (av); ++i)
		2724	PUSHs (newSVsv (AvARRAY (av)[i]));
		2725	}
		2726	}
		2727

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