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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.89 by root, Sat Nov 25 00:40:26 2006 UTC vs.
Revision 1.139 by root, Sun Jan 14 21:13:41 2007 UTC

1	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
4		2
5	#include "EXTERN.h"	3	#include "EXTERN.h"
6	#include "perl.h"	4	#include "perl.h"
7	#include "XSUB.h"	5	#include "XSUB.h"
8		6
9	#include "patchlevel.h"	7	#include "patchlevel.h"
10		8
11	#if PERL_VERSION < 6	9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
		12
		13	#ifdef HAVE_MMAP
		14	# include <unistd.h>
		15	# include <sys/mman.h>
		16	# ifndef MAP_ANONYMOUS
		17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
		19	# else
		20	# undef HAVE_MMAP
		21	# endif
		22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
		30	# endif
		31	#else
		32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	50	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	51	# define PL_ppaddr ppaddr
14	# endif	52	# endif
15	# ifndef call_sv	53	# ifndef call_sv
16	# define call_sv perl_call_sv	54	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	65	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	66	# define IS_PADCONST(v) 0
29	# endif	67	# endif
30	#endif	68	#endif
31		69
32	#include <errno.h>	70	/* 5.8.7 */
		71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
33		74
34	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
35	# undef STACKGUARD	76	# undef STACKGUARD
36	#endif	77	#endif
37		78
38	#ifndef STACKGUARD	79	#ifndef STACKGUARD
39	# define STACKGUARD 0	80	# define STACKGUARD 0
40	#endif	81	#endif
41		82
42	#ifdef HAVE_MMAP	83	/* prefer perl internal functions over our own? */
43	# include <unistd.h>	84	#ifndef PREFER_PERL_FUNCTIONS
44	# include <sys/mman.h>	85	# define PREFER_PERL_FUNCTIONS 0
45	# ifndef MAP_ANONYMOUS
46	# ifdef MAP_ANON
47	# define MAP_ANONYMOUS MAP_ANON
48	# else
49	# undef HAVE_MMAP
50	# endif
51	# endif	86	#endif
52	# include <limits.h>
53	# ifndef PAGESIZE
54	# define PAGESIZE pagesize
55	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
56	static long pagesize;
57	# else
58	# define BOOT_PAGESIZE
59	# endif
60	#endif
61
62	#define SUB_INIT "Coro::State::initialize"
63		87
64	/* The next macro should declare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
65	* to the current C stack pointer. Its property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
66	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
67	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
68		93
69	#define IN_DESTRUCT (PL_main_cv == Nullcv)	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
70		95
71	#define labs(l) ((l) >= 0 ? (l) : -(l))	96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		99	#else
		100	# define attribute(x)
		101	# define BARRIER
		102	#endif
		103
		104	#define NOINLINE attribute ((noinline))
72		105
73	#include "CoroAPI.h"	106	#include "CoroAPI.h"
74		107
75	#ifdef USE_ITHREADS	108	#ifdef USE_ITHREADS
76	static perl_mutex coro_mutex;	109	static perl_mutex coro_mutex;
…		…
79	#else	112	#else
80	# define LOCK (void)0	113	# define LOCK (void)0
81	# define UNLOCK (void)0	114	# define UNLOCK (void)0
82	#endif	115	#endif
83		116
		117	/* helper storage struct for Coro::AIO */
		118	struct io_state
		119	{
		120	int errorno;
		121	I32 laststype;
		122	int laststatval;
		123	Stat_t statcache;
		124	};
		125
84	static struct CoroAPI coroapi;	126	static struct CoroAPI coroapi;
85	static AV *main_mainstack; /* used to differentiate between $main and others */	127	static AV *main_mainstack; /* used to differentiate between $main and others */
86	static HV *coro_state_stash, *coro_stash;	128	static HV *coro_state_stash, *coro_stash;
87	static SV *coro_mortal; /* will be freed after next transfer */	129	static SV *coro_mortal; /* will be freed after next transfer */
88		130
89	/* this is actually not just the c stack but also c registers etc... */	131	static struct coro_cctx *cctx_first;
		132	static int cctx_count, cctx_idle;
		133
		134	/* this is a structure representing a c-level coroutine */
90	typedef struct coro_stack {	135	typedef struct coro_cctx {
91	struct coro_stack *next;	136	struct coro_cctx *next;
92		137
93	void *idle_sp;	138	/* the stack */
94	void *sptr;	139	void *sptr;
95	long ssize; /* positive == mmap, otherwise malloc */	140	long ssize; /* positive == mmap, otherwise malloc */
96		141
97	/* cpu state */	142	/* cpu state */
		143	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		144	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		145	JMPENV *top_env;
98	coro_context cctx;	146	coro_context cctx;
99	} coro_stack;
100		147
101	static coro_stack *main_stack;	148	int inuse;
102		149
		150	#if USE_VALGRIND
		151	int valgrind_id;
		152	#endif
		153	} coro_cctx;
		154
		155	enum {
		156	CF_RUNNING = 0x0001, /* coroutine is running */
		157	CF_READY = 0x0002, /* coroutine is ready */
		158	CF_NEW = 0x0004, /* has never been switched to */
		159	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		160	};
		161
		162	/* this is a structure representing a perl-level coroutine */
103	struct coro {	163	struct coro {
104	/* optionally saved, might be zero */	164	/* the c coroutine allocated to this perl coroutine, if any */
105	AV *defav;	165	coro_cctx *cctx;
106	SV *defsv;
107	SV *errsv;
108
109	/* saved global state not related to stacks */
110	U8 dowarn;
111	I32 in_eval;
112
113	/* the c stack, if any */
114	coro_stack *stack;
115
116	/* the stacks and related info (callchain etc..) */
117	PERL_SI *curstackinfo;
118	AV *curstack;
119	AV *mainstack;
120	SV **stack_sp;
121	OP *op;
122	SV **curpad;
123	AV *comppad;
124	CV *compcv;
125	SV **stack_base;
126	SV **stack_max;
127	SV **tmps_stack;
128	I32 tmps_floor;
129	I32 tmps_ix;
130	I32 tmps_max;
131	I32 *markstack;
132	I32 *markstack_ptr;
133	I32 *markstack_max;
134	I32 *scopestack;
135	I32 scopestack_ix;
136	I32 scopestack_max;
137	ANY *savestack;
138	I32 savestack_ix;
139	I32 savestack_max;
140	OP **retstack;
141	I32 retstack_ix;
142	I32 retstack_max;
143	PMOP *curpm;
144	COP *curcop;
145	JMPENV *top_env;
146
147	/* coro process data */
148	int prio;
149		166
150	/* data associated with this coroutine (initial args) */	167	/* data associated with this coroutine (initial args) */
151	AV *args;	168	AV *args;
152	int refcnt;	169	int refcnt;
		170	int save; /* CORO_SAVE flags */
		171	int flags; /* CF_ flags */
		172
		173	/* optionally saved, might be zero */
		174	AV *defav; /* @_ */
		175	SV *defsv; /* $_ */
		176	SV *errsv; /* $@ */
		177	SV *irssv; /* $/ */
		178	SV *irssv_sv; /* real $/ cache */
		179
		180	#define VAR(name,type) type name;
		181	# include "state.h"
		182	#undef VAR
		183
		184	/* coro process data */
		185	int prio;
153	};	186	};
154		187
155	typedef struct coro *Coro__State;	188	typedef struct coro *Coro__State;
156	typedef struct coro *Coro__State_or_hashref;	189	typedef struct coro *Coro__State_or_hashref;
157		190
		191	/** Coro ********************************************************************/
		192
		193	#define PRIO_MAX 3
		194	#define PRIO_HIGH 1
		195	#define PRIO_NORMAL 0
		196	#define PRIO_LOW -1
		197	#define PRIO_IDLE -3
		198	#define PRIO_MIN -4
		199
		200	/* for Coro.pm */
		201	static SV *coro_current;
		202	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		203	static int coro_nready;
		204
		205	/** lowlevel stuff **********************************************************/
		206
158	static AV *	207	static AV *
159	coro_clone_padlist (pTHX_ CV *cv)	208	coro_clone_padlist (CV *cv)
160	{	209	{
161	AV *padlist = CvPADLIST (cv);	210	AV *padlist = CvPADLIST (cv);
162	AV *newpadlist, *newpad;	211	AV *newpadlist, *newpad;
163		212
164	newpadlist = newAV ();	213	newpadlist = newAV ();
165	AvREAL_off (newpadlist);	214	AvREAL_off (newpadlist);
166	#if PERL_VERSION < 9	215	#if PERL_VERSION_ATLEAST (5,9,0)
		216	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		217	#else
167	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	218	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
168	#else
169	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
170	#endif	219	#endif
171	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	220	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
172	--AvFILLp (padlist);	221	--AvFILLp (padlist);
173		222
174	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	223	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
176		225
177	return newpadlist;	226	return newpadlist;
178	}	227	}
179		228
180	static void	229	static void
181	free_padlist (pTHX_ AV *padlist)	230	free_padlist (AV *padlist)
182	{	231	{
183	/* may be during global destruction */	232	/* may be during global destruction */
184	if (SvREFCNT (padlist))	233	if (SvREFCNT (padlist))
185	{	234	{
186	I32 i = AvFILLp (padlist);	235	I32 i = AvFILLp (padlist);
…		…
207	AV *padlist;	256	AV *padlist;
208	AV *av = (AV *)mg->mg_obj;	257	AV *av = (AV *)mg->mg_obj;
209		258
210	/* casting is fun. */	259	/* casting is fun. */
211	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	260	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
212	free_padlist (aTHX_ padlist);	261	free_padlist (padlist);
213		262
214	SvREFCNT_dec (av);	263	SvREFCNT_dec (av);
215		264
216	return 0;	265	return 0;
217	}	266	}
218		267
219	#define PERL_MAGIC_coro PERL_MAGIC_ext	268	#define PERL_MAGIC_coro PERL_MAGIC_ext
220		269
221	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	270	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
222		271
		272	#define CORO_MAGIC(cv) \
		273	SvMAGIC (cv) \
		274	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		275	? SvMAGIC (cv) \
		276	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		277	: 0
		278
223	/* the next two functions merely cache the padlists */	279	/* the next two functions merely cache the padlists */
224	static void	280	static void
225	get_padlist (pTHX_ CV *cv)	281	get_padlist (CV *cv)
226	{	282	{
227	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	283	MAGIC *mg = CORO_MAGIC (cv);
		284	AV *av;
228		285
229	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	286	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
230	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	287	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
231	else	288	else
232	{	289	{
233	#if 0	290	#if PREFER_PERL_FUNCTIONS
234	/* this should work - but it doesn't :( */	291	/* this is probably cleaner, but also slower? */
235	CV *cp = Perl_cv_clone (aTHX_ cv);	292	CV *cp = Perl_cv_clone (cv);
236	CvPADLIST (cv) = CvPADLIST (cp);	293	CvPADLIST (cv) = CvPADLIST (cp);
237	CvPADLIST (cp) = 0;	294	CvPADLIST (cp) = 0;
238	SvREFCNT_dec (cp);	295	SvREFCNT_dec (cp);
239	#else	296	#else
240	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	297	CvPADLIST (cv) = coro_clone_padlist (cv);
241	#endif	298	#endif
242	}	299	}
243	}	300	}
244		301
245	static void	302	static void
246	put_padlist (pTHX_ CV *cv)	303	put_padlist (CV *cv)
247	{	304	{
248	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	305	MAGIC *mg = CORO_MAGIC (cv);
		306	AV *av;
249		307
250	if (!mg)	308	if (!mg)
251	{	309	{
252	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	310	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
253	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	311	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
254	mg->mg_virtual = &vtbl_coro;	312	mg->mg_virtual = &vtbl_coro;
255	mg->mg_obj = (SV *)newAV ();	313	mg->mg_obj = (SV *)newAV ();
256	}	314	}
257		315
258	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	316	av = (AV *)mg->mg_obj;
		317
		318	if (AvFILLp (av) >= AvMAX (av))
		319	av_extend (av, AvMAX (av) + 1);
		320
		321	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
259	}	322	}
		323
		324	/** load & save, init *******************************************************/
260		325
261	#define SB do {	326	#define SB do {
262	#define SE } while (0)	327	#define SE } while (0)
263		328
264	#define LOAD(state) load_state(aTHX_ (state));
265	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
266
267	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	329	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
268		330
269	static void	331	static void
270	load_state(pTHX_ Coro__State c)	332	load_perl (Coro__State c)
271	{	333	{
272	PL_dowarn = c->dowarn;	334	#define VAR(name,type) PL_ ## name = c->name;
273	PL_in_eval = c->in_eval;	335	# include "state.h"
274		336	#undef VAR
275	PL_curstackinfo = c->curstackinfo;
276	PL_curstack = c->curstack;
277	PL_mainstack = c->mainstack;
278	PL_stack_sp = c->stack_sp;
279	PL_op = c->op;
280	PL_curpad = c->curpad;
281	PL_comppad = c->comppad;
282	PL_compcv = c->compcv;
283	PL_stack_base = c->stack_base;
284	PL_stack_max = c->stack_max;
285	PL_tmps_stack = c->tmps_stack;
286	PL_tmps_floor = c->tmps_floor;
287	PL_tmps_ix = c->tmps_ix;
288	PL_tmps_max = c->tmps_max;
289	PL_markstack = c->markstack;
290	PL_markstack_ptr = c->markstack_ptr;
291	PL_markstack_max = c->markstack_max;
292	PL_scopestack = c->scopestack;
293	PL_scopestack_ix = c->scopestack_ix;
294	PL_scopestack_max = c->scopestack_max;
295	PL_savestack = c->savestack;
296	PL_savestack_ix = c->savestack_ix;
297	PL_savestack_max = c->savestack_max;
298	#if PERL_VERSION < 9
299	PL_retstack = c->retstack;
300	PL_retstack_ix = c->retstack_ix;
301	PL_retstack_max = c->retstack_max;
302	#endif
303	PL_curpm = c->curpm;
304	PL_curcop = c->curcop;
305	PL_top_env = c->top_env;
306		337
307	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	338	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
308	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	339	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
309	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	340	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		341	if (c->irssv)
		342	{
		343	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		344	SvREFCNT_dec (c->irssv);
		345	else
		346	{
		347	REPLACE_SV (PL_rs, c->irssv);
		348	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		349	sv_setsv (c->irssv_sv, PL_rs);
		350	}
		351	}
310		352
311	{	353	{
312	dSP;	354	dSP;
313	CV *cv;	355	CV *cv;
314		356
315	/* now do the ugly restore mess */	357	/* now do the ugly restore mess */
316	while ((cv = (CV *)POPs))	358	while ((cv = (CV *)POPs))
317	{	359	{
318	AV *padlist = (AV *)POPs;
319
320	if (padlist)
321	{
322	put_padlist (aTHX_ cv); /* mark this padlist as available */	360	put_padlist (cv); /* mark this padlist as available */
323	CvPADLIST(cv) = padlist;	361	CvDEPTH (cv) = PTR2IV (POPs);
324	}	362	CvPADLIST (cv) = (AV *)POPs;
325
326	++CvDEPTH(cv);
327	}	363	}
328		364
329	PUTBACK;	365	PUTBACK;
330	}	366	}
331	}	367	}
332		368
333	static void	369	static void
334	save_state(pTHX_ Coro__State c, int flags)	370	save_perl (Coro__State c)
335	{	371	{
336	{	372	{
337	dSP;	373	dSP;
338	I32 cxix = cxstack_ix;	374	I32 cxix = cxstack_ix;
339	PERL_CONTEXT *ccstk = cxstack;	375	PERL_CONTEXT *ccstk = cxstack;
…		…
342	/*	378	/*
343	* the worst thing you can imagine happens first - we have to save	379	* the worst thing you can imagine happens first - we have to save
344	* (and reinitialize) all cv's in the whole callchain :(	380	* (and reinitialize) all cv's in the whole callchain :(
345	*/	381	*/
346		382
		383	EXTEND (SP, 3 + 1);
347	PUSHs (Nullsv);	384	PUSHs (Nullsv);
348	/* this loop was inspired by pp_caller */	385	/* this loop was inspired by pp_caller */
349	for (;;)	386	for (;;)
350	{	387	{
351	while (cxix >= 0)	388	while (cxix >= 0)
352	{	389	{
353	PERL_CONTEXT *cx = &ccstk[cxix--];	390	PERL_CONTEXT *cx = &ccstk[cxix--];
354		391
355	if (CxTYPE(cx) == CXt_SUB)	392	if (CxTYPE (cx) == CXt_SUB)
356	{	393	{
357	CV *cv = cx->blk_sub.cv;	394	CV *cv = cx->blk_sub.cv;
		395
358	if (CvDEPTH(cv))	396	if (CvDEPTH (cv))
359	{	397	{
360	EXTEND (SP, CvDEPTH(cv)*2);	398	EXTEND (SP, 3);
361
362	while (--CvDEPTH(cv))
363	{
364	/* this tells the restore code to increment CvDEPTH */
365	PUSHs (Nullsv);
366	PUSHs ((SV *)cv);
367	}
368
369	PUSHs ((SV *)CvPADLIST(cv));	399	PUSHs ((SV *)CvPADLIST (cv));
		400	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
370	PUSHs ((SV *)cv);	401	PUSHs ((SV *)cv);
371		402
		403	CvDEPTH (cv) = 0;
372	get_padlist (aTHX_ cv);	404	get_padlist (cv);
373	}	405	}
374	}	406	}
375	#ifdef CXt_FORMAT
376	else if (CxTYPE(cx) == CXt_FORMAT)
377	{
378	/* I never used formats, so how should I know how these are implemented? */
379	/* my bold guess is as a simple, plain sub... */
380	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
381	}
382	#endif
383	}	407	}
384		408
385	if (top_si->si_type == PERLSI_MAIN)	409	if (top_si->si_type == PERLSI_MAIN)
386	break;	410	break;
387		411
…		…
391	}	415	}
392		416
393	PUTBACK;	417	PUTBACK;
394	}	418	}
395		419
396	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	420	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
397	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	421	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
398	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	422	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		423	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
399		424
400	c->dowarn = PL_dowarn;	425	#define VAR(name,type)c->name = PL_ ## name;
401	c->in_eval = PL_in_eval;	426	# include "state.h"
402		427	#undef VAR
403	c->curstackinfo = PL_curstackinfo;
404	c->curstack = PL_curstack;
405	c->mainstack = PL_mainstack;
406	c->stack_sp = PL_stack_sp;
407	c->op = PL_op;
408	c->curpad = PL_curpad;
409	c->comppad = PL_comppad;
410	c->compcv = PL_compcv;
411	c->stack_base = PL_stack_base;
412	c->stack_max = PL_stack_max;
413	c->tmps_stack = PL_tmps_stack;
414	c->tmps_floor = PL_tmps_floor;
415	c->tmps_ix = PL_tmps_ix;
416	c->tmps_max = PL_tmps_max;
417	c->markstack = PL_markstack;
418	c->markstack_ptr = PL_markstack_ptr;
419	c->markstack_max = PL_markstack_max;
420	c->scopestack = PL_scopestack;
421	c->scopestack_ix = PL_scopestack_ix;
422	c->scopestack_max = PL_scopestack_max;
423	c->savestack = PL_savestack;
424	c->savestack_ix = PL_savestack_ix;
425	c->savestack_max = PL_savestack_max;
426	#if PERL_VERSION < 9
427	c->retstack = PL_retstack;
428	c->retstack_ix = PL_retstack_ix;
429	c->retstack_max = PL_retstack_max;
430	#endif
431	c->curpm = PL_curpm;
432	c->curcop = PL_curcop;
433	c->top_env = PL_top_env;
434	}	428	}
435		429
436	/*	430	/*
437	* allocate various perl stacks. This is an exact copy	431	* allocate various perl stacks. This is an exact copy
438	* of perl.c:init_stacks, except that it uses less memory	432	* of perl.c:init_stacks, except that it uses less memory
439	* on the (sometimes correct) assumption that coroutines do	433	* on the (sometimes correct) assumption that coroutines do
440	* not usually need a lot of stackspace.	434	* not usually need a lot of stackspace.
441	*/	435	*/
		436	#if PREFER_PERL_FUNCTIONS
		437	# define coro_init_stacks init_stacks
		438	#else
442	static void	439	static void
443	coro_init_stacks (pTHX)	440	coro_init_stacks ()
444	{	441	{
445	LOCK;
446
447	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	442	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
448	PL_curstackinfo->si_type = PERLSI_MAIN;	443	PL_curstackinfo->si_type = PERLSI_MAIN;
449	PL_curstack = PL_curstackinfo->si_stack;	444	PL_curstack = PL_curstackinfo->si_stack;
450	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	445	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
451		446
452	PL_stack_base = AvARRAY(PL_curstack);	447	PL_stack_base = AvARRAY(PL_curstack);
453	PL_stack_sp = PL_stack_base;	448	PL_stack_sp = PL_stack_base;
454	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	449	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
455		450
456	New(50,PL_tmps_stack,96,SV*);	451	New(50,PL_tmps_stack,128,SV*);
457	PL_tmps_floor = -1;	452	PL_tmps_floor = -1;
458	PL_tmps_ix = -1;	453	PL_tmps_ix = -1;
459	PL_tmps_max = 96;	454	PL_tmps_max = 128;
460		455
461	New(54,PL_markstack,16,I32);	456	New(54,PL_markstack,32,I32);
462	PL_markstack_ptr = PL_markstack;	457	PL_markstack_ptr = PL_markstack;
463	PL_markstack_max = PL_markstack + 16;	458	PL_markstack_max = PL_markstack + 32;
464		459
465	#ifdef SET_MARK_OFFSET	460	#ifdef SET_MARK_OFFSET
466	SET_MARK_OFFSET;	461	SET_MARK_OFFSET;
467	#endif	462	#endif
468		463
469	New(54,PL_scopestack,16,I32);	464	New(54,PL_scopestack,32,I32);
470	PL_scopestack_ix = 0;	465	PL_scopestack_ix = 0;
471	PL_scopestack_max = 16;	466	PL_scopestack_max = 32;
472		467
473	New(54,PL_savestack,96,ANY);	468	New(54,PL_savestack,64,ANY);
474	PL_savestack_ix = 0;	469	PL_savestack_ix = 0;
475	PL_savestack_max = 96;	470	PL_savestack_max = 64;
476		471
477	#if PERL_VERSION < 9	472	#if !PERL_VERSION_ATLEAST (5,9,0)
478	New(54,PL_retstack,8,OP*);	473	New(54,PL_retstack,16,OP*);
479	PL_retstack_ix = 0;	474	PL_retstack_ix = 0;
480	PL_retstack_max = 8;	475	PL_retstack_max = 16;
481	#endif	476	#endif
482
483	UNLOCK;
484	}	477	}
		478	#endif
485		479
486	/*	480	/*
487	* destroy the stacks, the callchain etc...	481	* destroy the stacks, the callchain etc...
488	*/	482	*/
489	static void	483	static void
490	destroy_stacks(pTHX)	484	coro_destroy_stacks ()
491	{	485	{
492	if (!IN_DESTRUCT)	486	if (!IN_DESTRUCT)
493	{	487	{
494	/* is this ugly, I ask? */	488	/* restore all saved variables and stuff */
495	LEAVE_SCOPE (0);	489	LEAVE_SCOPE (0);
		490	assert (PL_tmps_floor == -1);
496		491
497	/* sure it is, but more important: is it correct?? :/ */	492	/* free all temporaries */
498	FREETMPS;	493	FREETMPS;
		494	assert (PL_tmps_ix == -1);
499		495
		496	/* unwind all extra stacks */
500	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/	497	POPSTACK_TO (PL_mainstack);
		498
		499	/* unwind main stack */
		500	dounwind (-1);
501	}	501	}
502		502
503	while (PL_curstackinfo->si_next)	503	while (PL_curstackinfo->si_next)
504	PL_curstackinfo = PL_curstackinfo->si_next;	504	PL_curstackinfo = PL_curstackinfo->si_next;
505		505
506	while (PL_curstackinfo)	506	while (PL_curstackinfo)
507	{	507	{
508	PERL_SI *p = PL_curstackinfo->si_prev;	508	PERL_SI *p = PL_curstackinfo->si_prev;
509		509
510	{ /*D*//*remove*/
511	dSP;
512	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
513	PUTBACK; /* possibly superfluous */
514	}
515
516	if (!IN_DESTRUCT)	510	if (!IN_DESTRUCT)
517	{
518	dounwind (-1);/*D*//*remove*/
519	SvREFCNT_dec (PL_curstackinfo->si_stack);	511	SvREFCNT_dec (PL_curstackinfo->si_stack);
520	}
521		512
522	Safefree (PL_curstackinfo->si_cxstack);	513	Safefree (PL_curstackinfo->si_cxstack);
523	Safefree (PL_curstackinfo);	514	Safefree (PL_curstackinfo);
524	PL_curstackinfo = p;	515	PL_curstackinfo = p;
525	}	516	}
526		517
527	Safefree (PL_tmps_stack);	518	Safefree (PL_tmps_stack);
528	Safefree (PL_markstack);	519	Safefree (PL_markstack);
529	Safefree (PL_scopestack);	520	Safefree (PL_scopestack);
530	Safefree (PL_savestack);	521	Safefree (PL_savestack);
531	#if PERL_VERSION < 9	522	#if !PERL_VERSION_ATLEAST (5,9,0)
532	Safefree (PL_retstack);	523	Safefree (PL_retstack);
533	#endif	524	#endif
534	}	525	}
		526
		527	/** coroutine stack handling ************************************************/
535		528
536	static void	529	static void
537	setup_coro (struct coro *coro)	530	setup_coro (struct coro *coro)
538	{	531	{
539	/*	532	/*
540	* emulate part of the perl startup here.	533	* emulate part of the perl startup here.
541	*/	534	*/
542	dTHX;	535
		536	coro_init_stacks ();
		537
		538	PL_curcop = &PL_compiling;
		539	PL_in_eval = EVAL_NULL;
		540	PL_curpm = 0;
		541	PL_localizing = 0;
		542	PL_dirty = 0;
		543	PL_restartop = 0;
		544
		545	{
		546	dSP;
		547	LOGOP myop;
		548
		549	SvREFCNT_dec (GvAV (PL_defgv));
		550	GvAV (PL_defgv) = coro->args; coro->args = 0;
		551
		552	Zero (&myop, 1, LOGOP);
		553	myop.op_next = Nullop;
		554	myop.op_flags = OPf_WANT_VOID;
		555
		556	PUSHMARK (SP);
		557	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		558	PUTBACK;
		559	PL_op = (OP *)&myop;
		560	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		561	SPAGAIN;
		562	}
		563
		564	ENTER; /* necessary e.g. for dounwind */
		565	}
		566
		567	static void
		568	free_coro_mortal ()
		569	{
		570	if (coro_mortal)
		571	{
		572	SvREFCNT_dec (coro_mortal);
		573	coro_mortal = 0;
		574	}
		575	}
		576
		577	/* inject a fake call to Coro::State::_cctx_init into the execution */
		578	static void NOINLINE
		579	prepare_cctx (coro_cctx *cctx)
		580	{
543	dSP;	581	dSP;
544	UNOP myop;	582	LOGOP myop;
545	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
546		583
547	coro_init_stacks (aTHX);
548	/*PL_curcop = 0;*/
549	/*PL_in_eval = PL_in_eval;*/ /* inherit */
550	SvREFCNT_dec (GvAV (PL_defgv));
551	GvAV (PL_defgv) = coro->args; coro->args = 0;
552
553	SPAGAIN;
554
555	Zero (&myop, 1, UNOP);	584	Zero (&myop, 1, LOGOP);
556	myop.op_next = Nullop;	585	myop.op_next = PL_op;
557	myop.op_flags = OPf_WANT_VOID;	586	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
558		587
		588	PUSHMARK (SP);
		589	EXTEND (SP, 2);
		590	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		591	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		592	PUTBACK;
559	PL_op = (OP *)&myop;	593	PL_op = (OP *)&myop;
560
561	PUSHMARK(SP);
562	XPUSHs (sub_init);
563	PUTBACK;
564	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	594	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
565	SPAGAIN;	595	SPAGAIN;
566
567	ENTER; /* necessary e.g. for dounwind */
568	}	596	}
569		597
570	static void	598	static void
571	transfer_tail ()	599	coro_run (void *arg)
572	{	600	{
573	if (coro_mortal)	601	/* coro_run is the alternative tail of transfer(), so unlock here. */
574	{
575	SvREFCNT_dec (coro_mortal);
576	coro_mortal = 0;
577	}
578
579	UNLOCK;	602	UNLOCK;
580	}
581		603
582	static void
583	coro_run (void *arg)
584	{
585	/*	604	/*
586	* this is a _very_ stripped down perl interpreter ;)	605	* this is a _very_ stripped down perl interpreter ;)
587	*/	606	*/
588	dTHX;
589
590	transfer_tail ();
591
592	PL_top_env = &PL_start_env;	607	PL_top_env = &PL_start_env;
593	PL_restartop = PL_op->op_next;	608
		609	/* inject call to cctx_init */
		610	prepare_cctx ((coro_cctx *)arg);
		611
594	/* somebody will hit me for both perl_run and PL_restart_top */	612	/* somebody will hit me for both perl_run and PL_restartop */
595	perl_run (aTHX_ PERL_GET_CONTEXT);	613	PL_restartop = PL_op;
		614	perl_run (PL_curinterp);
596		615
		616	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
597	abort ();	617	abort ();
598	}	618	}
599		619
600	static coro_stack *	620	static coro_cctx *
601	stack_new ()	621	cctx_new ()
602	{	622	{
603	coro_stack *stack;	623	coro_cctx *cctx;
604		624
		625	++cctx_count;
		626
605	New (0, stack, 1, coro_stack);	627	Newz (0, cctx, 1, coro_cctx);
606		628
607	#if HAVE_MMAP	629	#if HAVE_MMAP
608		630
609	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	631	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		632	/* mmap supposedly does allocate-on-write for us */
610	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	633	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
611		634
612	if (stack->sptr == (void *)-1)	635	if (cctx->sptr == (void *)-1)
613	{	636	{
614	fprintf (stderr, "FATAL: unable to mmap stack for coroutine\n");	637	perror ("FATAL: unable to mmap stack for coroutine");
615	_exit (EXIT_FAILURE);	638	_exit (EXIT_FAILURE);
616	}	639	}
617		640
		641	# if STACKGUARD
618	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	642	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		643	# endif
619		644
620	#else	645	#else
621		646
622	stack->ssize = STACKSIZE * (long)sizeof (long);	647	cctx->ssize = STACKSIZE * (long)sizeof (long);
623	New (0, stack->sptr, STACKSIZE, long);	648	New (0, cctx->sptr, STACKSIZE, long);
624		649
625	if (!stack->sptr)	650	if (!cctx->sptr)
626	{	651	{
627	fprintf (stderr, "FATAL: unable to malloc stack for coroutine\n");	652	perror ("FATAL: unable to malloc stack for coroutine");
628	_exit (EXIT_FAILURE);	653	_exit (EXIT_FAILURE);
629	}	654	}
630		655
631	#endif	656	#endif
632		657
		658	#if USE_VALGRIND
		659	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		660	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		661	cctx->ssize + (char *)cctx->sptr
		662	);
		663	#endif
		664
633	coro_create (&stack->cctx, coro_run, 0, stack->sptr, stack->ssize);	665	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
634		666
635	return stack;	667	return cctx;
636	}	668	}
637		669
638	static void	670	static void
639	stack_free (coro_stack *stack)	671	cctx_destroy (coro_cctx *cctx)
640	{	672	{
641	if (!stack || stack == main_stack)	673	if (!cctx)
642	return;	674	return;
643		675
		676	--cctx_count;
		677
		678	#if USE_VALGRIND
		679	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		680	#endif
		681
644	#if HAVE_MMAP	682	#if HAVE_MMAP
645	munmap (stack->sptr, stack->ssize);	683	munmap (cctx->sptr, cctx->ssize);
646	#else	684	#else
647	Safefree (stack->sptr);	685	Safefree (cctx->sptr);
648	#endif	686	#endif
649		687
650	Safefree (stack);	688	Safefree (cctx);
651	}	689	}
652		690
653	static coro_stack *stack_first;	691	static coro_cctx *
654		692	cctx_get ()
655	static void
656	stack_get (struct coro *coro)
657	{	693	{
		694	coro_cctx *cctx;
		695
658	if (stack_first)	696	if (cctx_first)
659	{	697	{
660	coro->stack = stack_first;	698	cctx = cctx_first;
661	stack_first = stack_first->next;	699	cctx_first = cctx->next;
		700	--cctx_idle;
662	}	701	}
663	else	702	else
664	coro->stack = stack_new ();	703	{
665	}	704	cctx = cctx_new ();
		705	PL_op = PL_op->op_next;
		706	}
666		707
667	static void	708	return cctx;
668	stack_put (coro_stack *stack)
669	{
670	stack->next = stack_first;
671	stack_first = stack;
672	}	709	}
		710
		711	static void
		712	cctx_put (coro_cctx *cctx)
		713	{
		714	/* free another cctx if overlimit */
		715	if (cctx_idle >= MAX_IDLE_CCTX)
		716	{
		717	coro_cctx *first = cctx_first;
		718	cctx_first = first->next;
		719	--cctx_idle;
		720
		721	assert (!first->inuse);
		722	cctx_destroy (first);
		723	}
		724
		725	++cctx_idle;
		726	cctx->next = cctx_first;
		727	cctx_first = cctx;
		728	}
		729
		730	/** coroutine switching *****************************************************/
673		731
674	/* never call directly, always through the coro_state_transfer global variable */	732	/* never call directly, always through the coro_state_transfer global variable */
675	static void	733	static void NOINLINE
676	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	734	transfer (struct coro *prev, struct coro *next)
677	{	735	{
678	dSTACKLEVEL;	736	dSTACKLEVEL;
679		737
680	/* sometimes transfer is only called to set idle_sp */	738	/* sometimes transfer is only called to set idle_sp */
681	if (!prev->stack->idle_sp)	739	if (!next)
682	prev->stack->idle_sp = stacklevel;	740	{
683		741	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
684	LOCK;	742	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
685		743	}
686	if (prev != next)	744	else if (prev != next)
687	{	745	{
688	coro_stack *prev_stack = prev->stack;	746	coro_cctx *prev__cctx;
689		747
690	/* possibly "free" the stack */	748	if (prev->flags & CF_NEW)
691	if (prev_stack->idle_sp == stacklevel)
692	{	749	{
693	stack_put (prev_stack);	750	/* create a new empty context */
694	prev->stack = 0;	751	Newz (0, prev->cctx, 1, coro_cctx);
		752	prev->cctx->inuse = 1;
		753	prev->flags &= ~CF_NEW;
		754	prev->flags |= CF_RUNNING;
695	}	755	}
696		756
697	if (!next->mainstack)	757	/*TODO: must not croak here */
		758	if (!prev->flags & CF_RUNNING)
		759	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		760
		761	if (next->flags & CF_RUNNING)
		762	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		763
		764	if (next->flags & CF_DESTROYED)
		765	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		766
		767	prev->flags &= ~CF_RUNNING;
		768	next->flags |= CF_RUNNING;
		769
		770	LOCK;
		771
		772	if (next->flags & CF_NEW)
698	{	773	{
		774	/* need to start coroutine */
		775	next->flags &= ~CF_NEW;
699	/* first get rid of the old state */	776	/* first get rid of the old state */
700	SAVE (prev, -1);	777	save_perl (prev);
701	/* setup coroutine call */	778	/* setup coroutine call */
702	setup_coro (next);	779	setup_coro (next);
703	next->stack = 0;	780	/* need a new stack */
		781	assert (!next->cctx);
704	}	782	}
705	else	783	else
706	{	784	{
707	SAVE (prev, flags);	785	/* coroutine already started */
708	LOAD (next);	786	save_perl (prev);
		787	load_perl (next);
709	}	788	}
710		789
		790	prev__cctx = prev->cctx;
		791
		792	/* possibly "free" the cctx */
		793	if (prev__cctx->idle_sp == STACKLEVEL)
		794	{
		795	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		796	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		797
		798	prev->cctx = 0;
		799
		800	cctx_put (prev__cctx);
		801	prev__cctx->inuse = 0;
		802	}
		803
711	if (!next->stack)	804	if (!next->cctx)
712	stack_get (next);	805	{
		806	next->cctx = cctx_get ();
		807	assert (!next->cctx->inuse);
		808	next->cctx->inuse = 1;
		809	}
713		810
714	if (prev_stack != next->stack)	811	if (prev__cctx != next->cctx)
		812	{
		813	prev__cctx->top_env = PL_top_env;
		814	PL_top_env = next->cctx->top_env;
715	coro_transfer (&prev_stack->cctx, &next->stack->cctx);	815	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
716	}	816	}
717		817
718	transfer_tail ();	818	free_coro_mortal ();
		819	UNLOCK;
		820	}
719	}	821	}
720		822
721	/* use this function pointer to call the above function */	823	struct transfer_args
722	/* this is done to increase chances of the compiler not inlining the call */	824	{
723	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;	825	struct coro *prev, *next;
		826	};
724		827
		828	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		829
		830	/** high level stuff ********************************************************/
		831
725	static void	832	static int
726	coro_state_destroy (struct coro *coro)	833	coro_state_destroy (struct coro *coro)
727	{	834	{
728	if (coro->refcnt--)	835	if (coro->flags & CF_DESTROYED)
729	return;	836	return 0;
		837
		838	coro->flags |= CF_DESTROYED;
		839
		840	if (coro->flags & CF_READY)
		841	{
		842	/* reduce nready, as destroying a ready coro effectively unreadies it */
		843	/* alternative: look through all ready queues and remove the coro */
		844	LOCK;
		845	--coro_nready;
		846	UNLOCK;
		847	}
		848	else
		849	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
730		850
731	if (coro->mainstack && coro->mainstack != main_mainstack)	851	if (coro->mainstack && coro->mainstack != main_mainstack)
732	{	852	{
		853	assert (!(coro->flags & CF_RUNNING));
		854
733	struct coro temp;	855	struct coro temp;
		856	Zero (&temp, 1, struct coro);
		857	temp.save = CORO_SAVE_ALL;
734		858
735	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	859	if (coro->flags & CF_RUNNING)
736	LOAD (aTHX_ coro);	860	croak ("FATAL: tried to destroy currently running coroutine");
737		861
		862	save_perl (&temp);
		863	load_perl (coro);
		864
738	destroy_stacks (aTHX);	865	coro_destroy_stacks ();
739		866
740	LOAD ((&temp)); /* this will get rid of defsv etc.. */	867	load_perl (&temp); /* this will get rid of defsv etc.. */
741		868
742	coro->mainstack = 0;	869	coro->mainstack = 0;
743	}	870	}
744		871
745	stack_free (coro->stack);	872	cctx_destroy (coro->cctx);
746	SvREFCNT_dec (coro->args);	873	SvREFCNT_dec (coro->args);
747	Safefree (coro);	874
		875	return 1;
748	}	876	}
749		877
750	static int	878	static int
751	coro_state_clear (SV *sv, MAGIC *mg)	879	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
752	{	880	{
753	struct coro *coro = (struct coro *)mg->mg_ptr;	881	struct coro *coro = (struct coro *)mg->mg_ptr;
754	mg->mg_ptr = 0;	882	mg->mg_ptr = 0;
755		883
		884	if (--coro->refcnt < 0)
		885	{
756	coro_state_destroy (coro);	886	coro_state_destroy (coro);
		887	Safefree (coro);
		888	}
757		889
758	return 0;	890	return 0;
759	}	891	}
760		892
761	static int	893	static int
762	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)	894	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
763	{	895	{
764	struct coro *coro = (struct coro *)mg->mg_ptr;	896	struct coro *coro = (struct coro *)mg->mg_ptr;
765		897
766	++coro->refcnt;	898	++coro->refcnt;
767		899
768	return 0;	900	return 0;
769	}	901	}
770		902
771	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	903	static MGVTBL coro_state_vtbl = {
		904	0, 0, 0, 0,
		905	coro_state_free,
		906	0,
		907	#ifdef MGf_DUP
		908	coro_state_dup,
		909	#else
		910	# define MGf_DUP 0
		911	#endif
		912	};
772		913
773	static struct coro *	914	static struct coro *
774	SvSTATE (SV *coro)	915	SvSTATE (SV *coro)
775	{	916	{
776	HV *stash;	917	HV *stash;
…		…
791	assert (mg->mg_type == PERL_MAGIC_ext);	932	assert (mg->mg_type == PERL_MAGIC_ext);
792	return (struct coro *)mg->mg_ptr;	933	return (struct coro *)mg->mg_ptr;
793	}	934	}
794		935
795	static void	936	static void
		937	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		938	{
		939	ta->prev = SvSTATE (prev_sv);
		940	ta->next = SvSTATE (next_sv);
		941	}
		942
		943	static void
796	api_transfer (pTHX_ SV *prev, SV *next, int flags)	944	api_transfer (SV *prev_sv, SV *next_sv)
797	{	945	{
798	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	946	struct transfer_args ta;
		947
		948	prepare_transfer (&ta, prev_sv, next_sv);
		949	TRANSFER (ta);
		950	}
		951
		952	static int
		953	api_save (SV *coro_sv, int new_save)
		954	{
		955	struct coro *coro = SvSTATE (coro_sv);
		956	int old_save = coro->save;
		957
		958	if (new_save >= 0)
		959	coro->save = new_save;
		960
		961	return old_save;
799	}	962	}
800		963
801	/** Coro ********************************************************************/	964	/** Coro ********************************************************************/
802		965
803	#define PRIO_MAX 3
804	#define PRIO_HIGH 1
805	#define PRIO_NORMAL 0
806	#define PRIO_LOW -1
807	#define PRIO_IDLE -3
808	#define PRIO_MIN -4
809
810	/* for Coro.pm */
811	static GV *coro_current, *coro_idle;
812	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
813	static int coro_nready;
814
815	static void	966	static void
816	coro_enq (pTHX_ SV *sv)	967	coro_enq (SV *coro_sv)
817	{	968	{
818	int prio;
819
820	if (SvTYPE (sv) != SVt_PVHV)
821	croak ("Coro::ready tried to enqueue something that is not a coroutine");
822
823	prio = SvSTATE (sv)->prio;
824
825	av_push (coro_ready [prio - PRIO_MIN], sv);	969	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
826	coro_nready++;
827	}	970	}
828		971
829	static SV *	972	static SV *
830	coro_deq (pTHX_ int min_prio)	973	coro_deq (int min_prio)
831	{	974	{
832	int prio = PRIO_MAX - PRIO_MIN;	975	int prio = PRIO_MAX - PRIO_MIN;
833		976
834	min_prio -= PRIO_MIN;	977	min_prio -= PRIO_MIN;
835	if (min_prio < 0)	978	if (min_prio < 0)
836	min_prio = 0;	979	min_prio = 0;
837		980
838	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	981	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
839	if (AvFILLp (coro_ready [prio]) >= 0)	982	if (AvFILLp (coro_ready [prio]) >= 0)
840	{
841	coro_nready--;
842	return av_shift (coro_ready [prio]);	983	return av_shift (coro_ready [prio]);
843	}
844		984
845	return 0;	985	return 0;
846	}	986	}
847		987
848	static void	988	static int
849	api_ready (SV *coro)	989	api_ready (SV *coro_sv)
850	{	990	{
851	dTHX;	991	struct coro *coro;
852		992
853	if (SvROK (coro))	993	if (SvROK (coro_sv))
854	coro = SvRV (coro);	994	coro_sv = SvRV (coro_sv);
		995
		996	coro = SvSTATE (coro_sv);
		997
		998	if (coro->flags & CF_READY)
		999	return 0;
		1000
		1001	coro->flags |= CF_READY;
855		1002
856	LOCK;	1003	LOCK;
857	coro_enq (aTHX_ SvREFCNT_inc (coro));	1004	coro_enq (SvREFCNT_inc (coro_sv));
		1005	++coro_nready;
858	UNLOCK;	1006	UNLOCK;
		1007
		1008	return 1;
		1009	}
		1010
		1011	static int
		1012	api_is_ready (SV *coro_sv)
		1013	{
		1014	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1015	}
		1016
		1017	static void
		1018	prepare_schedule (struct transfer_args *ta)
		1019	{
		1020	SV *prev_sv, *next_sv;
		1021
		1022	for (;;)
		1023	{
		1024	LOCK;
		1025	next_sv = coro_deq (PRIO_MIN);
		1026
		1027	/* nothing to schedule: call the idle handler */
		1028	if (!next_sv)
		1029	{
		1030	UNLOCK;
		1031	dSP;
		1032
		1033	ENTER;
		1034	SAVETMPS;
		1035
		1036	PUSHMARK (SP);
		1037	PUTBACK;
		1038	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1039
		1040	FREETMPS;
		1041	LEAVE;
		1042	continue;
		1043	}
		1044
		1045	ta->next = SvSTATE (next_sv);
		1046
		1047	/* cannot transfer to destroyed coros, skip and look for next */
		1048	if (ta->next->flags & CF_DESTROYED)
		1049	{
		1050	UNLOCK;
		1051	SvREFCNT_dec (next_sv);
		1052	/* coro_nready is already taken care of by destroy */
		1053	continue;
		1054	}
		1055
		1056	--coro_nready;
		1057	UNLOCK;
		1058	break;
		1059	}
		1060
		1061	/* free this only after the transfer */
		1062	prev_sv = SvRV (coro_current);
		1063	SvRV_set (coro_current, next_sv);
		1064	ta->prev = SvSTATE (prev_sv);
		1065
		1066	assert (ta->next->flags & CF_READY);
		1067	ta->next->flags &= ~CF_READY;
		1068
		1069	LOCK;
		1070	free_coro_mortal ();
		1071	coro_mortal = prev_sv;
		1072	UNLOCK;
		1073	}
		1074
		1075	static void
		1076	prepare_cede (struct transfer_args *ta)
		1077	{
		1078	api_ready (coro_current);
		1079	prepare_schedule (ta);
		1080	}
		1081
		1082	static int
		1083	prepare_cede_notself (struct transfer_args *ta)
		1084	{
		1085	if (coro_nready)
		1086	{
		1087	SV *prev = SvRV (coro_current);
		1088	prepare_schedule (ta);
		1089	api_ready (prev);
		1090	return 1;
		1091	}
		1092	else
		1093	return 0;
859	}	1094	}
860		1095
861	static void	1096	static void
862	api_schedule (void)	1097	api_schedule (void)
863	{	1098	{
864	dTHX;	1099	struct transfer_args ta;
865		1100
866	SV *prev, *next;	1101	prepare_schedule (&ta);
867	SV *current = GvSV (coro_current);	1102	TRANSFER (ta);
868
869	for (;;)
870	{
871	LOCK;
872
873	next = coro_deq (aTHX_ PRIO_MIN);
874
875	if (next)
876	break;
877
878	UNLOCK;
879
880	{
881	dSP;
882
883	ENTER;
884	SAVETMPS;
885
886	PUSHMARK (SP);
887	PUTBACK;
888	call_sv (GvSV (coro_idle), G_DISCARD);
889
890	FREETMPS;
891	LEAVE;
892	}
893	}
894
895	prev = SvRV (current);
896	SvRV (current) = next;
897
898	/* free this only after the transfer */
899	coro_mortal = prev;
900
901	UNLOCK;
902
903	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), TRANSFER_SAVE_ALL);
904	}	1103	}
905		1104
906	static int coro_cede_self;
907
908	static void	1105	static int
909	api_cede (void)	1106	api_cede (void)
910	{	1107	{
911	dTHX;	1108	struct transfer_args ta;
912	SV *current = SvREFCNT_inc (SvRV (GvSV (coro_current)));
913		1109
914	LOCK;	1110	prepare_cede (&ta);
915		1111
916	if (coro_cede_self)	1112	if (ta.prev != ta.next)
917	{	1113	{
918	AV *runqueue = coro_ready [PRIO_MAX - PRIO_MIN];	1114	TRANSFER (ta);
919	av_unshift (runqueue, 1);	1115	return 1;
920	av_store (runqueue, 0, current);
921	coro_nready++;
922	coro_cede_self = 0;
923	}	1116	}
924	else	1117	else
925	coro_enq (aTHX_ current);	1118	return 0;
		1119	}
926		1120
927	UNLOCK;	1121	static int
		1122	api_cede_notself (void)
		1123	{
		1124	struct transfer_args ta;
928		1125
929	api_schedule ();	1126	if (prepare_cede_notself (&ta))
		1127	{
		1128	TRANSFER (ta);
		1129	return 1;
		1130	}
		1131	else
		1132	return 0;
930	}	1133	}
931		1134
932	MODULE = Coro::State PACKAGE = Coro::State	1135	MODULE = Coro::State PACKAGE = Coro::State
933		1136
934	PROTOTYPES: DISABLE	1137	PROTOTYPES: DISABLE
…		…
940	#endif	1143	#endif
941	BOOT_PAGESIZE;	1144	BOOT_PAGESIZE;
942		1145
943	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1146	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
944		1147
945	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1148	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
946	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1149	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
947	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1150	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1151	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1152	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
948		1153
949	main_mainstack = PL_mainstack;	1154	main_mainstack = PL_mainstack;
950		1155
951	coroapi.ver = CORO_API_VERSION;	1156	coroapi.ver = CORO_API_VERSION;
952	coroapi.transfer = api_transfer;	1157	coroapi.transfer = api_transfer;
953
954	Newz (0, main_stack, 1, coro_stack);
955	main_stack->idle_sp = (void *)-1;
956		1158
957	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1159	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
958	}	1160	}
959		1161
960	SV *	1162	SV *
…		…
965	HV *hv;	1167	HV *hv;
966	int i;	1168	int i;
967		1169
968	Newz (0, coro, 1, struct coro);	1170	Newz (0, coro, 1, struct coro);
969	coro->args = newAV ();	1171	coro->args = newAV ();
		1172	coro->save = CORO_SAVE_ALL;
		1173	coro->flags = CF_NEW;
970		1174
971	hv = newHV ();	1175	hv = newHV ();
972	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1176	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
973	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1177	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
974		1178
975	av_push (coro->args, newSVsv (RETVAL));
976	for (i = 1; i < items; i++)	1179	for (i = 1; i < items; i++)
977	av_push (coro->args, newSVsv (ST (i)));	1180	av_push (coro->args, newSVsv (ST (i)));
978
979	coro->stack = main_stack;
980	/*coro->mainstack = 0; *//*actual work is done inside transfer */
981	/*coro->stack = 0;*/
982	}	1181	}
983	OUTPUT:	1182	OUTPUT:
984	RETVAL	1183	RETVAL
985		1184
		1185	int
		1186	save (SV *coro, int new_save = -1)
		1187	CODE:
		1188	RETVAL = api_save (coro, new_save);
		1189	OUTPUT:
		1190	RETVAL
		1191
986	void	1192	void
987	transfer (prev, next, flags)	1193	_set_stacklevel (...)
988	SV *prev	1194	ALIAS:
989	SV *next	1195	Coro::State::transfer = 1
990	int flags	1196	Coro::schedule = 2
		1197	Coro::cede = 3
		1198	Coro::cede_notself = 4
991	CODE:	1199	CODE:
992	PUTBACK;
993	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);
994	SPAGAIN;
995
996	int
997	prio (Coro::State coro, int newprio = 0)
998	ALIAS:
999	nice = 1
1000	CODE:
1001	{	1200	{
1002	RETVAL = coro->prio;	1201	struct transfer_args ta;
1003		1202
1004	if (items > 1)	1203	switch (ix)
1005	{	1204	{
		1205	case 0:
		1206	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1207	ta.next = 0;
		1208	break;
		1209
		1210	case 1:
1006	if (ix)	1211	if (items != 2)
1007	newprio += coro->prio;	1212	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1008		1213
1009	if (newprio < PRIO_MIN) newprio = PRIO_MIN;	1214	prepare_transfer (&ta, ST (0), ST (1));
1010	if (newprio > PRIO_MAX) newprio = PRIO_MAX;	1215	break;
1011		1216
1012	coro->prio = newprio;	1217	case 2:
		1218	prepare_schedule (&ta);
		1219	break;
		1220
		1221	case 3:
		1222	prepare_cede (&ta);
		1223	break;
		1224
		1225	case 4:
		1226	if (!prepare_cede_notself (&ta))
		1227	XSRETURN_EMPTY;
		1228
		1229	break;
1013	}	1230	}
1014	}
1015		1231
1016	void	1232	BARRIER;
1017	_clear_idle_sp (Coro::State self)	1233	TRANSFER (ta);
		1234
		1235	if (GIMME_V != G_VOID && ta.next != ta.prev)
		1236	XSRETURN_YES;
		1237	}
		1238
		1239	bool
		1240	_destroy (SV *coro_sv)
1018	CODE:	1241	CODE:
1019	self->stack->idle_sp = 0;	1242	RETVAL = coro_state_destroy (SvSTATE (coro_sv));
1020		1243	OUTPUT:
1021	void	1244	RETVAL
1022	_clone_state_from (SV *dst, SV *src)
1023	CODE:
1024	{
1025	struct coro *coro_src = SvSTATE (src);
1026
1027	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1028
1029	++coro_src->refcnt;
1030	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1031	}
1032		1245
1033	void	1246	void
1034	_exit (code)	1247	_exit (code)
1035	int code	1248	int code
1036	PROTOTYPE: $	1249	PROTOTYPE: $
1037	CODE:	1250	CODE:
1038	_exit (code);	1251	_exit (code);
1039		1252
1040	MODULE = Coro::State PACKAGE = Coro::Cont	1253	int
		1254	cctx_count ()
		1255	CODE:
		1256	RETVAL = cctx_count;
		1257	OUTPUT:
		1258	RETVAL
1041		1259
1042	void	1260	int
1043	yield (...)	1261	cctx_idle ()
1044	PROTOTYPE: @	1262	CODE:
1045	CODE:	1263	RETVAL = cctx_idle;
1046	{	1264	OUTPUT:
1047	SV *yieldstack;	1265	RETVAL
1048	SV *sv;
1049	AV *defav = GvAV (PL_defgv);
1050	struct coro *prev, *next;
1051
1052	yieldstack = *hv_fetch (
1053	(HV *)SvRV (GvSV (coro_current)),
1054	"yieldstack", sizeof ("yieldstack") - 1,
1055	0
1056	);
1057
1058	/* set up @_ -- ugly */
1059	av_clear (defav);
1060	av_fill (defav, items - 1);
1061	while (items--)
1062	av_store (defav, items, SvREFCNT_inc (ST(items)));
1063
1064	sv = av_pop ((AV *)SvRV (yieldstack));
1065	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1066	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1067	SvREFCNT_dec (sv);
1068
1069	coro_state_transfer (aTHX_ prev, next, 0);
1070	}
1071		1266
1072	MODULE = Coro::State PACKAGE = Coro	1267	MODULE = Coro::State PACKAGE = Coro
1073		1268
1074	BOOT:	1269	BOOT:
1075	{	1270	{
…		…
1082	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1277	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1083	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1278	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1084	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1279	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1085	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1280	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1086		1281
1087	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1282	coro_current = get_sv ("Coro::current", FALSE);
1088	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1283	SvREADONLY_on (coro_current);
1089		1284
1090	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1285	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1091	coro_ready[i] = newAV ();	1286	coro_ready[i] = newAV ();
1092		1287
1093	{	1288	{
1094	SV *sv = perl_get_sv("Coro::API", 1);	1289	SV *sv = perl_get_sv("Coro::API", 1);
1095		1290
1096	coroapi.schedule = api_schedule;	1291	coroapi.schedule = api_schedule;
		1292	coroapi.save = api_save;
1097	coroapi.cede = api_cede;	1293	coroapi.cede = api_cede;
		1294	coroapi.cede_notself = api_cede_notself;
1098	coroapi.ready = api_ready;	1295	coroapi.ready = api_ready;
		1296	coroapi.is_ready = api_is_ready;
1099	coroapi.nready = &coro_nready;	1297	coroapi.nready = &coro_nready;
1100	coroapi.current = coro_current;	1298	coroapi.current = coro_current;
1101		1299
1102	GCoroAPI = &coroapi;	1300	GCoroAPI = &coroapi;
1103	sv_setiv (sv, (IV)&coroapi);	1301	sv_setiv (sv, (IV)&coroapi);
1104	SvREADONLY_on (sv);	1302	SvREADONLY_on (sv);
1105	}	1303	}
1106	}	1304	}
1107		1305
1108	void	1306	void
		1307	_set_current (SV *current)
		1308	PROTOTYPE: $
		1309	CODE:
		1310	SvREFCNT_dec (SvRV (coro_current));
		1311	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1312
		1313	int
		1314	prio (Coro::State coro, int newprio = 0)
		1315	ALIAS:
		1316	nice = 1
		1317	CODE:
		1318	{
		1319	RETVAL = coro->prio;
		1320
		1321	if (items > 1)
		1322	{
		1323	if (ix)
		1324	newprio = coro->prio - newprio;
		1325
		1326	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1327	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1328
		1329	coro->prio = newprio;
		1330	}
		1331	}
		1332	OUTPUT:
		1333	RETVAL
		1334
		1335	SV *
1109	ready (SV *self)	1336	ready (SV *self)
1110	PROTOTYPE: $	1337	PROTOTYPE: $
1111	CODE:	1338	CODE:
1112	api_ready (self);	1339	RETVAL = boolSV (api_ready (self));
		1340	OUTPUT:
		1341	RETVAL
		1342
		1343	SV *
		1344	is_ready (SV *self)
		1345	PROTOTYPE: $
		1346	CODE:
		1347	RETVAL = boolSV (api_is_ready (self));
		1348	OUTPUT:
		1349	RETVAL
1113		1350
1114	int	1351	int
1115	nready (...)	1352	nready (...)
1116	PROTOTYPE:	1353	PROTOTYPE:
1117	CODE:	1354	CODE:
1118	RETVAL = coro_nready;	1355	RETVAL = coro_nready;
1119	OUTPUT:	1356	OUTPUT:
1120	RETVAL	1357	RETVAL
1121		1358
1122	void
1123	schedule (...)
1124	PROTOTYPE:
1125	CODE:
1126	api_schedule ();
1127
1128	void
1129	_set_cede_self ()
1130	CODE:
1131	coro_cede_self = 1;
1132
1133	void
1134	cede (...)
1135	PROTOTYPE:
1136	CODE:
1137	api_cede ();
1138
1139	MODULE = Coro::State PACKAGE = Coro::AIO	1359	MODULE = Coro::State PACKAGE = Coro::AIO
1140		1360
1141	SV *	1361	SV *
1142	_get_state ()	1362	_get_state ()
1143	CODE:	1363	CODE:
1144	{	1364	{
1145	struct {	1365	struct io_state *data;
1146	int errorno;
1147	int laststype;
1148	int laststatval;
1149	Stat_t statcache;
1150	} data;
1151		1366
		1367	RETVAL = newSV (sizeof (struct io_state));
		1368	data = (struct io_state *)SvPVX (RETVAL);
		1369	SvCUR_set (RETVAL, sizeof (struct io_state));
		1370	SvPOK_only (RETVAL);
		1371
1152	data.errorno = errno;	1372	data->errorno = errno;
1153	data.laststype = PL_laststype;	1373	data->laststype = PL_laststype;
1154	data.laststatval = PL_laststatval;	1374	data->laststatval = PL_laststatval;
1155	data.statcache = PL_statcache;	1375	data->statcache = PL_statcache;
1156
1157	RETVAL = newSVpvn ((char *)&data, sizeof data);
1158	}	1376	}
1159	OUTPUT:	1377	OUTPUT:
1160	RETVAL	1378	RETVAL
1161		1379
1162	void	1380	void
1163	_set_state (char *data_)	1381	_set_state (char *data_)
1164	PROTOTYPE: $	1382	PROTOTYPE: $
1165	CODE:	1383	CODE:
1166	{	1384	{
1167	struct {	1385	struct io_state *data = (void *)data_;
1168	int errorno;
1169	int laststype;
1170	int laststatval;
1171	Stat_t statcache;
1172	} *data = (void *)data_;
1173		1386
1174	errno = data->errorno;	1387	errno = data->errorno;
1175	PL_laststype = data->laststype;	1388	PL_laststype = data->laststype;
1176	PL_laststatval = data->laststatval;	1389	PL_laststatval = data->laststatval;
1177	PL_statcache = data->statcache;	1390	PL_statcache = data->statcache;
1178	}	1391	}
		1392

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