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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.92 by root, Sun Nov 26 02:16:19 2006 UTC vs.
Revision 1.133 by root, Thu Jan 4 20:14:19 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 <stdio.h>	70	/* 5.8.7 */
33	#include <errno.h>	71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
34		74
35	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
36	# undef STACKGUARD	76	# undef STACKGUARD
37	#endif	77	#endif
38		78
39	#ifndef STACKGUARD	79	#ifndef STACKGUARD
40	# define STACKGUARD 0	80	# define STACKGUARD 0
41	#endif	81	#endif
42		82
43	#ifdef HAVE_MMAP	83	/* prefer perl internal functions over our own? */
44	# include <unistd.h>	84	#ifndef PREFER_PERL_FUNCTIONS
45	# include <sys/mman.h>	85	# define PREFER_PERL_FUNCTIONS 0
46	# ifndef MAP_ANONYMOUS
47	# ifdef MAP_ANON
48	# define MAP_ANONYMOUS MAP_ANON
49	# else
50	# undef HAVE_MMAP
51	# endif
52	# endif
53	# include <limits.h>
54	# ifndef PAGESIZE
55	# define PAGESIZE pagesize
56	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
57	static long pagesize;
58	# else
59	# define BOOT_PAGESIZE
60	# endif
61	#endif	86	#endif
62		87
63	/* 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
64	* 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
65	* and should be unique. */	90	* and should be unique. */
66	#define dSTACKLEVEL int stacklevel	91	#define dSTACKLEVEL int stacklevel
67	#define STACKLEVEL ((void *)&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
75	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
76		107
77	#ifdef USE_ITHREADS	108	#ifdef USE_ITHREADS
78	static perl_mutex coro_mutex;	109	static perl_mutex coro_mutex;
79	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	110	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
80	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	111	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
81	#else	112	#else
82	# define LOCK (void)0	113	# define LOCK (void)0
83	# define UNLOCK (void)0	114	# define UNLOCK (void)0
84	#endif	115	#endif
85		116
		117	struct io_state
		118	{
		119	int errorno;
		120	I32 laststype;
		121	int laststatval;
		122	Stat_t statcache;
		123	};
		124
86	static struct CoroAPI coroapi;	125	static struct CoroAPI coroapi;
87	static AV *main_mainstack; /* used to differentiate between $main and others */	126	static AV *main_mainstack; /* used to differentiate between $main and others */
88	static HV *coro_state_stash, *coro_stash;	127	static HV *coro_state_stash, *coro_stash;
89	static SV *coro_mortal; /* will be freed after next transfer */	128	static SV *coro_mortal; /* will be freed after next transfer */
90		129
		130	static struct coro_cctx *cctx_first;
		131	static int cctx_count, cctx_idle;
		132
91	/* this is a structure representing a c-level coroutine */	133	/* this is a structure representing a c-level coroutine */
92	typedef struct coro_stack {	134	typedef struct coro_cctx {
93	struct coro_stack *next;	135	struct coro_cctx *next;
94		136
95	void *idle_sp; /* original stacklevel when coroutine was created */	137	/* the stack */
96	void *sptr;	138	void *sptr;
97	long ssize; /* positive == mmap, otherwise malloc */	139	long ssize; /* positive == mmap, otherwise malloc */
98		140
99	/* cpu state */	141	/* cpu state */
		142	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		143	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		144	JMPENV *top_env;
100	coro_context cctx;	145	coro_context cctx;
101	JMPENV *top_env;
102	} coro_stack;
103		146
104	/* the (fake) coro_stack representing the main program */	147	int inuse;
105	static coro_stack *main_stack;	148
		149	#if USE_VALGRIND
		150	int valgrind_id;
		151	#endif
		152	} coro_cctx;
		153
		154	enum {
		155	CF_RUNNING = 0x0001, /* coroutine is running */
		156	CF_READY = 0x0002, /* coroutine is ready */
		157	CF_NEW = 0x0004, /* has never been switched to */
		158	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		159	};
106		160
107	/* this is a structure representing a perl-level coroutine */	161	/* this is a structure representing a perl-level coroutine */
108	struct coro {	162	struct coro {
109	/* the c coroutine allocated to this perl coroutine, if any */	163	/* the c coroutine allocated to this perl coroutine, if any */
110	coro_stack *stack;	164	coro_cctx *cctx;
111		165
112	/* data associated with this coroutine (initial args) */	166	/* data associated with this coroutine (initial args) */
113	AV *args;	167	AV *args;
114	int refcnt;	168	int refcnt;
		169	int save; /* CORO_SAVE flags */
		170	int flags; /* CF_ flags */
115		171
116	/* optionally saved, might be zero */	172	/* optionally saved, might be zero */
117	AV *defav;	173	AV *defav; /* @_ */
118	SV *defsv;	174	SV *defsv; /* $_ */
119	SV *errsv;	175	SV *errsv; /* $@ */
		176	SV *irssv; /* $/ */
		177	SV *irssv_sv; /* real $/ cache */
120		178
121	/* saved global state not related to stacks */	179	#define VAR(name,type) type name;
122	U8 dowarn;	180	# include "state.h"
123	I32 in_eval;	181	#undef VAR
124
125	/* the stacks and related info (callchain etc..) */
126	PERL_SI *curstackinfo;
127	AV *curstack;
128	AV *mainstack;
129	SV **stack_sp;
130	OP *op;
131	SV **curpad;
132	AV *comppad;
133	CV *compcv;
134	SV **stack_base;
135	SV **stack_max;
136	SV **tmps_stack;
137	I32 tmps_floor;
138	I32 tmps_ix;
139	I32 tmps_max;
140	I32 *markstack;
141	I32 *markstack_ptr;
142	I32 *markstack_max;
143	I32 *scopestack;
144	I32 scopestack_ix;
145	I32 scopestack_max;
146	ANY *savestack;
147	I32 savestack_ix;
148	I32 savestack_max;
149	OP **retstack;
150	I32 retstack_ix;
151	I32 retstack_max;
152	PMOP *curpm;
153	COP *curcop;
154		182
155	/* coro process data */	183	/* coro process data */
156	int prio;	184	int prio;
157	};	185	};
158		186
159	typedef struct coro *Coro__State;	187	typedef struct coro *Coro__State;
160	typedef struct coro *Coro__State_or_hashref;	188	typedef struct coro *Coro__State_or_hashref;
161		189
162	static AV *	190	static AV *
163	coro_clone_padlist (pTHX_ CV *cv)	191	coro_clone_padlist (CV *cv)
164	{	192	{
165	AV *padlist = CvPADLIST (cv);	193	AV *padlist = CvPADLIST (cv);
166	AV *newpadlist, *newpad;	194	AV *newpadlist, *newpad;
167		195
168	newpadlist = newAV ();	196	newpadlist = newAV ();
169	AvREAL_off (newpadlist);	197	AvREAL_off (newpadlist);
170	#if PERL_VERSION < 9	198	#if PERL_VERSION_ATLEAST (5,9,0)
		199	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		200	#else
171	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	201	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
172	#else
173	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
174	#endif	202	#endif
175	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	203	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
176	--AvFILLp (padlist);	204	--AvFILLp (padlist);
177		205
178	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	206	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
180		208
181	return newpadlist;	209	return newpadlist;
182	}	210	}
183		211
184	static void	212	static void
185	free_padlist (pTHX_ AV *padlist)	213	free_padlist (AV *padlist)
186	{	214	{
187	/* may be during global destruction */	215	/* may be during global destruction */
188	if (SvREFCNT (padlist))	216	if (SvREFCNT (padlist))
189	{	217	{
190	I32 i = AvFILLp (padlist);	218	I32 i = AvFILLp (padlist);
…		…
211	AV *padlist;	239	AV *padlist;
212	AV *av = (AV *)mg->mg_obj;	240	AV *av = (AV *)mg->mg_obj;
213		241
214	/* casting is fun. */	242	/* casting is fun. */
215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	243	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
216	free_padlist (aTHX_ padlist);	244	free_padlist (padlist);
217		245
218	SvREFCNT_dec (av);	246	SvREFCNT_dec (av);
219		247
220	return 0;	248	return 0;
221	}	249	}
222		250
223	#define PERL_MAGIC_coro PERL_MAGIC_ext	251	#define PERL_MAGIC_coro PERL_MAGIC_ext
224		252
225	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	253	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
226		254
		255	#define CORO_MAGIC(cv) \
		256	SvMAGIC (cv) \
		257	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		258	? SvMAGIC (cv) \
		259	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		260	: 0
		261
227	/* the next two functions merely cache the padlists */	262	/* the next two functions merely cache the padlists */
228	static void	263	static void
229	get_padlist (pTHX_ CV *cv)	264	get_padlist (CV *cv)
230	{	265	{
231	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	266	MAGIC *mg = CORO_MAGIC (cv);
		267	AV *av;
232		268
233	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	269	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
234	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	270	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
235	else	271	else
236	{	272	{
237	#if 0	273	#if PREFER_PERL_FUNCTIONS
238	/* this should work - but it doesn't :( */	274	/* this is probably cleaner, but also slower? */
239	CV *cp = Perl_cv_clone (aTHX_ cv);	275	CV *cp = Perl_cv_clone (cv);
240	CvPADLIST (cv) = CvPADLIST (cp);	276	CvPADLIST (cv) = CvPADLIST (cp);
241	CvPADLIST (cp) = 0;	277	CvPADLIST (cp) = 0;
242	SvREFCNT_dec (cp);	278	SvREFCNT_dec (cp);
243	#else	279	#else
244	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	280	CvPADLIST (cv) = coro_clone_padlist (cv);
245	#endif	281	#endif
246	}	282	}
247	}	283	}
248		284
249	static void	285	static void
250	put_padlist (pTHX_ CV *cv)	286	put_padlist (CV *cv)
251	{	287	{
252	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	288	MAGIC *mg = CORO_MAGIC (cv);
		289	AV *av;
253		290
254	if (!mg)	291	if (!mg)
255	{	292	{
256	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	293	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
257	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	294	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
258	mg->mg_virtual = &vtbl_coro;	295	mg->mg_virtual = &vtbl_coro;
259	mg->mg_obj = (SV *)newAV ();	296	mg->mg_obj = (SV *)newAV ();
260	}	297	}
261		298
262	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	299	av = (AV *)mg->mg_obj;
		300
		301	if (AvFILLp (av) >= AvMAX (av))
		302	av_extend (av, AvMAX (av) + 1);
		303
		304	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
263	}	305	}
264		306
265	#define SB do {	307	#define SB do {
266	#define SE } while (0)	308	#define SE } while (0)
267		309
268	#define LOAD(state) load_state(aTHX_ (state));
269	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
270
271	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	310	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
272		311
273	static void	312	static void
274	load_state(pTHX_ Coro__State c)	313	load_perl (Coro__State c)
275	{	314	{
276	PL_dowarn = c->dowarn;	315	#define VAR(name,type) PL_ ## name = c->name;
277	PL_in_eval = c->in_eval;	316	# include "state.h"
278		317	#undef VAR
279	PL_curstackinfo = c->curstackinfo;
280	PL_curstack = c->curstack;
281	PL_mainstack = c->mainstack;
282	PL_stack_sp = c->stack_sp;
283	PL_op = c->op;
284	PL_curpad = c->curpad;
285	PL_comppad = c->comppad;
286	PL_compcv = c->compcv;
287	PL_stack_base = c->stack_base;
288	PL_stack_max = c->stack_max;
289	PL_tmps_stack = c->tmps_stack;
290	PL_tmps_floor = c->tmps_floor;
291	PL_tmps_ix = c->tmps_ix;
292	PL_tmps_max = c->tmps_max;
293	PL_markstack = c->markstack;
294	PL_markstack_ptr = c->markstack_ptr;
295	PL_markstack_max = c->markstack_max;
296	PL_scopestack = c->scopestack;
297	PL_scopestack_ix = c->scopestack_ix;
298	PL_scopestack_max = c->scopestack_max;
299	PL_savestack = c->savestack;
300	PL_savestack_ix = c->savestack_ix;
301	PL_savestack_max = c->savestack_max;
302	#if PERL_VERSION < 9
303	PL_retstack = c->retstack;
304	PL_retstack_ix = c->retstack_ix;
305	PL_retstack_max = c->retstack_max;
306	#endif
307	PL_curpm = c->curpm;
308	PL_curcop = c->curcop;
309		318
310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	319	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	320	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
312	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	321	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		322	if (c->irssv)
		323	{
		324	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		325	SvREFCNT_dec (c->irssv);
		326	else
		327	{
		328	REPLACE_SV (PL_rs, c->irssv);
		329	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		330	sv_setsv (c->irssv_sv, PL_rs);
		331	}
		332	}
313		333
314	{	334	{
315	dSP;	335	dSP;
316	CV *cv;	336	CV *cv;
317		337
318	/* now do the ugly restore mess */	338	/* now do the ugly restore mess */
319	while ((cv = (CV *)POPs))	339	while ((cv = (CV *)POPs))
320	{	340	{
321	AV *padlist = (AV *)POPs;
322
323	if (padlist)
324	{
325	put_padlist (aTHX_ cv); /* mark this padlist as available */	341	put_padlist (cv); /* mark this padlist as available */
326	CvPADLIST(cv) = padlist;	342	CvDEPTH (cv) = PTR2IV (POPs);
327	}	343	CvPADLIST (cv) = (AV *)POPs;
328
329	++CvDEPTH(cv);
330	}	344	}
331		345
332	PUTBACK;	346	PUTBACK;
333	}	347	}
334	}	348	}
335		349
336	static void	350	static void
337	save_state(pTHX_ Coro__State c, int flags)	351	save_perl (Coro__State c)
338	{	352	{
339	{	353	{
340	dSP;	354	dSP;
341	I32 cxix = cxstack_ix;	355	I32 cxix = cxstack_ix;
342	PERL_CONTEXT *ccstk = cxstack;	356	PERL_CONTEXT *ccstk = cxstack;
…		…
345	/*	359	/*
346	* the worst thing you can imagine happens first - we have to save	360	* the worst thing you can imagine happens first - we have to save
347	* (and reinitialize) all cv's in the whole callchain :(	361	* (and reinitialize) all cv's in the whole callchain :(
348	*/	362	*/
349		363
		364	EXTEND (SP, 3 + 1);
350	PUSHs (Nullsv);	365	PUSHs (Nullsv);
351	/* this loop was inspired by pp_caller */	366	/* this loop was inspired by pp_caller */
352	for (;;)	367	for (;;)
353	{	368	{
354	while (cxix >= 0)	369	while (cxix >= 0)
355	{	370	{
356	PERL_CONTEXT *cx = &ccstk[cxix--];	371	PERL_CONTEXT *cx = &ccstk[cxix--];
357		372
358	if (CxTYPE(cx) == CXt_SUB)	373	if (CxTYPE (cx) == CXt_SUB)
359	{	374	{
360	CV *cv = cx->blk_sub.cv;	375	CV *cv = cx->blk_sub.cv;
		376
361	if (CvDEPTH(cv))	377	if (CvDEPTH (cv))
362	{	378	{
363	EXTEND (SP, CvDEPTH(cv)*2);	379	EXTEND (SP, 3);
364
365	while (--CvDEPTH(cv))
366	{
367	/* this tells the restore code to increment CvDEPTH */
368	PUSHs (Nullsv);
369	PUSHs ((SV *)cv);
370	}
371
372	PUSHs ((SV *)CvPADLIST(cv));	380	PUSHs ((SV *)CvPADLIST (cv));
		381	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
373	PUSHs ((SV *)cv);	382	PUSHs ((SV *)cv);
374		383
		384	CvDEPTH (cv) = 0;
375	get_padlist (aTHX_ cv);	385	get_padlist (cv);
376	}	386	}
377	}	387	}
378	#ifdef CXt_FORMAT
379	else if (CxTYPE(cx) == CXt_FORMAT)
380	{
381	/* I never used formats, so how should I know how these are implemented? */
382	/* my bold guess is as a simple, plain sub... */
383	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
384	}
385	#endif
386	}	388	}
387		389
388	if (top_si->si_type == PERLSI_MAIN)	390	if (top_si->si_type == PERLSI_MAIN)
389	break;	391	break;
390		392
…		…
394	}	396	}
395		397
396	PUTBACK;	398	PUTBACK;
397	}	399	}
398		400
399	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	401	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
400	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	402	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
401	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	403	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		404	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
402		405
403	c->dowarn = PL_dowarn;	406	#define VAR(name,type)c->name = PL_ ## name;
404	c->in_eval = PL_in_eval;	407	# include "state.h"
405		408	#undef VAR
406	c->curstackinfo = PL_curstackinfo;
407	c->curstack = PL_curstack;
408	c->mainstack = PL_mainstack;
409	c->stack_sp = PL_stack_sp;
410	c->op = PL_op;
411	c->curpad = PL_curpad;
412	c->comppad = PL_comppad;
413	c->compcv = PL_compcv;
414	c->stack_base = PL_stack_base;
415	c->stack_max = PL_stack_max;
416	c->tmps_stack = PL_tmps_stack;
417	c->tmps_floor = PL_tmps_floor;
418	c->tmps_ix = PL_tmps_ix;
419	c->tmps_max = PL_tmps_max;
420	c->markstack = PL_markstack;
421	c->markstack_ptr = PL_markstack_ptr;
422	c->markstack_max = PL_markstack_max;
423	c->scopestack = PL_scopestack;
424	c->scopestack_ix = PL_scopestack_ix;
425	c->scopestack_max = PL_scopestack_max;
426	c->savestack = PL_savestack;
427	c->savestack_ix = PL_savestack_ix;
428	c->savestack_max = PL_savestack_max;
429	#if PERL_VERSION < 9
430	c->retstack = PL_retstack;
431	c->retstack_ix = PL_retstack_ix;
432	c->retstack_max = PL_retstack_max;
433	#endif
434	c->curpm = PL_curpm;
435	c->curcop = PL_curcop;
436	}	409	}
437		410
438	/*	411	/*
439	* allocate various perl stacks. This is an exact copy	412	* allocate various perl stacks. This is an exact copy
440	* of perl.c:init_stacks, except that it uses less memory	413	* of perl.c:init_stacks, except that it uses less memory
441	* on the (sometimes correct) assumption that coroutines do	414	* on the (sometimes correct) assumption that coroutines do
442	* not usually need a lot of stackspace.	415	* not usually need a lot of stackspace.
443	*/	416	*/
		417	#if PREFER_PERL_FUNCTIONS
		418	# define coro_init_stacks init_stacks
		419	#else
444	static void	420	static void
445	coro_init_stacks (pTHX)	421	coro_init_stacks ()
446	{	422	{
447	LOCK;
448
449	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	423	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
450	PL_curstackinfo->si_type = PERLSI_MAIN;	424	PL_curstackinfo->si_type = PERLSI_MAIN;
451	PL_curstack = PL_curstackinfo->si_stack;	425	PL_curstack = PL_curstackinfo->si_stack;
452	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	426	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
453		427
454	PL_stack_base = AvARRAY(PL_curstack);	428	PL_stack_base = AvARRAY(PL_curstack);
455	PL_stack_sp = PL_stack_base;	429	PL_stack_sp = PL_stack_base;
456	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	430	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
457		431
458	New(50,PL_tmps_stack,96,SV*);	432	New(50,PL_tmps_stack,128,SV*);
459	PL_tmps_floor = -1;	433	PL_tmps_floor = -1;
460	PL_tmps_ix = -1;	434	PL_tmps_ix = -1;
461	PL_tmps_max = 96;	435	PL_tmps_max = 128;
462		436
463	New(54,PL_markstack,16,I32);	437	New(54,PL_markstack,32,I32);
464	PL_markstack_ptr = PL_markstack;	438	PL_markstack_ptr = PL_markstack;
465	PL_markstack_max = PL_markstack + 16;	439	PL_markstack_max = PL_markstack + 32;
466		440
467	#ifdef SET_MARK_OFFSET	441	#ifdef SET_MARK_OFFSET
468	SET_MARK_OFFSET;	442	SET_MARK_OFFSET;
469	#endif	443	#endif
470		444
471	New(54,PL_scopestack,16,I32);	445	New(54,PL_scopestack,32,I32);
472	PL_scopestack_ix = 0;	446	PL_scopestack_ix = 0;
473	PL_scopestack_max = 16;	447	PL_scopestack_max = 32;
474		448
475	New(54,PL_savestack,96,ANY);	449	New(54,PL_savestack,64,ANY);
476	PL_savestack_ix = 0;	450	PL_savestack_ix = 0;
477	PL_savestack_max = 96;	451	PL_savestack_max = 64;
478		452
479	#if PERL_VERSION < 9	453	#if !PERL_VERSION_ATLEAST (5,9,0)
480	New(54,PL_retstack,8,OP*);	454	New(54,PL_retstack,16,OP*);
481	PL_retstack_ix = 0;	455	PL_retstack_ix = 0;
482	PL_retstack_max = 8;	456	PL_retstack_max = 16;
483	#endif	457	#endif
484
485	UNLOCK;
486	}	458	}
		459	#endif
487		460
488	/*	461	/*
489	* destroy the stacks, the callchain etc...	462	* destroy the stacks, the callchain etc...
490	*/	463	*/
491	static void	464	static void
492	destroy_stacks(pTHX)	465	coro_destroy_stacks ()
493	{	466	{
494	if (!IN_DESTRUCT)	467	if (!IN_DESTRUCT)
495	{	468	{
496	/* is this ugly, I ask? */	469	/* restore all saved variables and stuff */
497	LEAVE_SCOPE (0);	470	LEAVE_SCOPE (0);
		471	assert (PL_tmps_floor == -1);
498		472
499	/* sure it is, but more important: is it correct?? :/ */	473	/* free all temporaries */
500	FREETMPS;	474	FREETMPS;
		475	assert (PL_tmps_ix == -1);
501		476
502	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/	477	POPSTACK_TO (PL_mainstack);
503	}	478	}
504		479
505	while (PL_curstackinfo->si_next)	480	while (PL_curstackinfo->si_next)
506	PL_curstackinfo = PL_curstackinfo->si_next;	481	PL_curstackinfo = PL_curstackinfo->si_next;
507		482
508	while (PL_curstackinfo)	483	while (PL_curstackinfo)
509	{	484	{
510	PERL_SI *p = PL_curstackinfo->si_prev;	485	PERL_SI *p = PL_curstackinfo->si_prev;
511		486
512	{ /*D*//*remove*/
513	dSP;
514	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
515	PUTBACK; /* possibly superfluous */
516	}
517
518	if (!IN_DESTRUCT)	487	if (!IN_DESTRUCT)
519	{
520	dounwind (-1);/*D*//*remove*/
521	SvREFCNT_dec (PL_curstackinfo->si_stack);	488	SvREFCNT_dec (PL_curstackinfo->si_stack);
522	}
523		489
524	Safefree (PL_curstackinfo->si_cxstack);	490	Safefree (PL_curstackinfo->si_cxstack);
525	Safefree (PL_curstackinfo);	491	Safefree (PL_curstackinfo);
526	PL_curstackinfo = p;	492	PL_curstackinfo = p;
527	}	493	}
528		494
529	Safefree (PL_tmps_stack);	495	Safefree (PL_tmps_stack);
530	Safefree (PL_markstack);	496	Safefree (PL_markstack);
531	Safefree (PL_scopestack);	497	Safefree (PL_scopestack);
532	Safefree (PL_savestack);	498	Safefree (PL_savestack);
533	#if PERL_VERSION < 9	499	#if !PERL_VERSION_ATLEAST (5,9,0)
534	Safefree (PL_retstack);	500	Safefree (PL_retstack);
535	#endif	501	#endif
536	}	502	}
537		503
538	static void	504	static void
539	setup_coro (struct coro *coro)	505	setup_coro (struct coro *coro)
540	{	506	{
541	/*	507	/*
542	* emulate part of the perl startup here.	508	* emulate part of the perl startup here.
543	*/	509	*/
544	dTHX;	510
		511	coro_init_stacks ();
		512
		513	PL_curcop = &PL_compiling;
		514	PL_in_eval = EVAL_NULL;
		515	PL_curpm = 0;
		516	PL_localizing = 0;
		517	PL_dirty = 0;
		518	PL_restartop = 0;
		519
		520	{
		521	dSP;
		522	LOGOP myop;
		523
		524	SvREFCNT_dec (GvAV (PL_defgv));
		525	GvAV (PL_defgv) = coro->args; coro->args = 0;
		526
		527	Zero (&myop, 1, LOGOP);
		528	myop.op_next = Nullop;
		529	myop.op_flags = OPf_WANT_VOID;
		530
		531	PUSHMARK (SP);
		532	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		533	PUTBACK;
		534	PL_op = (OP *)&myop;
		535	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		536	SPAGAIN;
		537	}
		538
		539	ENTER; /* necessary e.g. for dounwind */
		540	}
		541
		542	static void
		543	free_coro_mortal ()
		544	{
		545	if (coro_mortal)
		546	{
		547	SvREFCNT_dec (coro_mortal);
		548	coro_mortal = 0;
		549	}
		550	}
		551
		552	/* inject a fake call to Coro::State::_cctx_init into the execution */
		553	static void NOINLINE
		554	prepare_cctx (coro_cctx *cctx)
		555	{
545	dSP;	556	dSP;
546	UNOP myop;	557	LOGOP myop;
547	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
548		558
549	coro_init_stacks (aTHX);
550	/*PL_curcop = 0;*/
551	/*PL_in_eval = PL_in_eval;*/ /* inherit */
552	SvREFCNT_dec (GvAV (PL_defgv));
553	GvAV (PL_defgv) = coro->args; coro->args = 0;
554
555	SPAGAIN;
556
557	Zero (&myop, 1, UNOP);	559	Zero (&myop, 1, LOGOP);
558	myop.op_next = Nullop;	560	myop.op_next = PL_op;
559	myop.op_flags = OPf_WANT_VOID;	561	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
560		562
		563	PUSHMARK (SP);
		564	EXTEND (SP, 2);
		565	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		566	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		567	PUTBACK;
561	PL_op = (OP *)&myop;	568	PL_op = (OP *)&myop;
562
563	PUSHMARK(SP);
564	XPUSHs (sub_init);
565	PUTBACK;
566	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	569	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
567	SPAGAIN;	570	SPAGAIN;
568
569	ENTER; /* necessary e.g. for dounwind */
570	}
571
572	static void
573	free_coro_mortal ()
574	{
575	if (coro_mortal)
576	{
577	SvREFCNT_dec (coro_mortal);
578	coro_mortal = 0;
579	}
580	}	571	}
581		572
582	static void	573	static void
583	coro_run (void *arg)	574	coro_run (void *arg)
584	{	575	{
		576	/* coro_run is the alternative tail of transfer(), so unlock here. */
		577	UNLOCK;
		578
585	/*	579	/*
586	* this is a _very_ stripped down perl interpreter ;)	580	* this is a _very_ stripped down perl interpreter ;)
587	*/	581	*/
588	dTHX;
589	PL_top_env = &PL_start_env;	582	PL_top_env = &PL_start_env;
590		583
591	UNLOCK;	584	/* inject call to cctx_init */
		585	prepare_cctx ((coro_cctx *)arg);
592		586
593	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV ((coro_stack *)arg));
594	sv_setiv (get_sv ("Coro::State::cctx_restartop", FALSE), PTR2IV (PL_op));
595	PL_restartop = CvSTART (get_cv ("Coro::State::cctx_init", FALSE));
596
597	/* somebody will hit me for both perl_run and PL_restart_op */	587	/* somebody will hit me for both perl_run and PL_restartop */
598	perl_run (aTHX_ PERL_GET_CONTEXT);	588	PL_restartop = PL_op;
		589	perl_run (PL_curinterp);
599		590
		591	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
600	abort ();	592	abort ();
601	}	593	}
602		594
603	static coro_stack *	595	static coro_cctx *
604	stack_new ()	596	cctx_new ()
605	{	597	{
606	coro_stack *stack;	598	coro_cctx *cctx;
607		599
		600	++cctx_count;
		601
608	New (0, stack, 1, coro_stack);	602	Newz (0, cctx, 1, coro_cctx);
609		603
610	#if HAVE_MMAP	604	#if HAVE_MMAP
611		605
612	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	606	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		607	/* mmap supposedly does allocate-on-write for us */
613	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	608	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
614		609
615	if (stack->sptr == (void *)-1)	610	if (cctx->sptr == (void *)-1)
616	{	611	{
617	perror ("FATAL: unable to mmap stack for coroutine");	612	perror ("FATAL: unable to mmap stack for coroutine");
618	_exit (EXIT_FAILURE);	613	_exit (EXIT_FAILURE);
619	}	614	}
620		615
		616	# if STACKGUARD
621	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	617	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		618	# endif
622		619
623	#else	620	#else
624		621
625	stack->ssize = STACKSIZE * (long)sizeof (long);	622	cctx->ssize = STACKSIZE * (long)sizeof (long);
626	New (0, stack->sptr, STACKSIZE, long);	623	New (0, cctx->sptr, STACKSIZE, long);
627		624
628	if (!stack->sptr)	625	if (!cctx->sptr)
629	{	626	{
630	perror (stderr, "FATAL: unable to malloc stack for coroutine");	627	perror ("FATAL: unable to malloc stack for coroutine");
631	_exit (EXIT_FAILURE);	628	_exit (EXIT_FAILURE);
632	}	629	}
633		630
634	#endif	631	#endif
635		632
		633	#if USE_VALGRIND
		634	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		635	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		636	cctx->ssize + (char *)cctx->sptr
		637	);
		638	#endif
		639
636	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);	640	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
637		641
638	return stack;	642	return cctx;
639	}	643	}
640		644
641	static void	645	static void
642	stack_free (coro_stack *stack)	646	cctx_destroy (coro_cctx *cctx)
643	{	647	{
644	if (!stack || stack == main_stack)	648	if (!cctx)
645	return;	649	return;
646		650
		651	--cctx_count;
		652
		653	#if USE_VALGRIND
		654	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		655	#endif
		656
647	#if HAVE_MMAP	657	#if HAVE_MMAP
648	munmap (stack->sptr, stack->ssize);	658	munmap (cctx->sptr, cctx->ssize);
649	#else	659	#else
650	Safefree (stack->sptr);	660	Safefree (cctx->sptr);
651	#endif	661	#endif
652		662
653	Safefree (stack);	663	Safefree (cctx);
654	}	664	}
655		665
656	static coro_stack *stack_first;
657
658	static coro_stack *	666	static coro_cctx *
659	stack_get ()	667	cctx_get ()
660	{	668	{
661	coro_stack *stack;	669	coro_cctx *cctx;
662		670
663	if (stack_first)	671	if (cctx_first)
664	{	672	{
665	stack = stack_first;	673	cctx = cctx_first;
666	stack_first = stack->next;	674	cctx_first = cctx->next;
		675	--cctx_idle;
667	}	676	}
668	else	677	else
669	{	678	{
670	stack = stack_new ();	679	cctx = cctx_new ();
671	PL_op = PL_op->op_next;	680	PL_op = PL_op->op_next;
672	}	681	}
673		682
674	return stack;	683	return cctx;
675	}	684	}
676		685
677	static void	686	static void
678	stack_put (coro_stack *stack)	687	cctx_put (coro_cctx *cctx)
679	{	688	{
680	stack->next = stack_first;	689	/* free another cctx if overlimit */
681	stack_first = stack;	690	if (cctx_idle >= MAX_IDLE_CCTX)
		691	{
		692	coro_cctx *first = cctx_first;
		693	cctx_first = first->next;
		694	--cctx_idle;
		695
		696	assert (!first->inuse);
		697	cctx_destroy (first);
		698	}
		699
		700	++cctx_idle;
		701	cctx->next = cctx_first;
		702	cctx_first = cctx;
682	}	703	}
683		704
684	/* never call directly, always through the coro_state_transfer global variable */	705	/* never call directly, always through the coro_state_transfer global variable */
685	static void	706	static void NOINLINE
686	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	707	transfer (struct coro *prev, struct coro *next)
687	{	708	{
688	dSTACKLEVEL;	709	dSTACKLEVEL;
689		710
690	/* sometimes transfer is only called to set idle_sp */	711	/* sometimes transfer is only called to set idle_sp */
691	if (flags == TRANSFER_SET_STACKLEVEL)	712	if (!next)
		713	{
692	((coro_stack *)prev)->idle_sp = STACKLEVEL;	714	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		715	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		716	}
693	else if (prev != next)	717	else if (prev != next)
694	{	718	{
695	coro_stack *prev__stack;	719	coro_cctx *prev__cctx;
		720
		721	if (prev->flags & CF_NEW)
		722	{
		723	/* create a new empty context */
		724	Newz (0, prev->cctx, 1, coro_cctx);
		725	prev->cctx->inuse = 1;
		726	prev->flags &= ~CF_NEW;
		727	prev->flags |= CF_RUNNING;
		728	}
		729
		730	/*TODO: must not croak here */
		731	if (!prev->flags & CF_RUNNING)
		732	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		733
		734	if (next->flags & CF_RUNNING)
		735	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		736
		737	if (next->flags & CF_DESTROYED)
		738	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		739
		740	prev->flags &= ~CF_RUNNING;
		741	next->flags |= CF_RUNNING;
696		742
697	LOCK;	743	LOCK;
698		744
699	if (next->mainstack)	745	if (next->flags & CF_NEW)
700	{	746	{
701	/* coroutine already started */	747	/* need to start coroutine */
702	SAVE (prev, flags);	748	next->flags &= ~CF_NEW;
703	LOAD (next);	749	/* first get rid of the old state */
		750	save_perl (prev);
		751	/* setup coroutine call */
		752	setup_coro (next);
		753	/* need a new stack */
		754	assert (!next->cctx);
704	}	755	}
705	else	756	else
706	{	757	{
707	/* need to start coroutine */	758	/* coroutine already started */
708	/* first get rid of the old state */	759	save_perl (prev);
709	SAVE (prev, -1);	760	load_perl (next);
710	/* setup coroutine call */
711	setup_coro (next);
712	/* need a stack */
713	next->stack = 0;
714	}	761	}
715		762
716	prev__stack = prev->stack;	763	prev__cctx = prev->cctx;
717		764
718	/* possibly "free" the stack */	765	/* possibly "free" the cctx */
719	if (prev__stack->idle_sp == STACKLEVEL)	766	if (prev__cctx->idle_sp == STACKLEVEL)
720	{	767	{
721	stack_put (prev__stack);	768	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		769	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		770
722	prev->stack = 0;	771	prev->cctx = 0;
		772
		773	cctx_put (prev__cctx);
		774	prev__cctx->inuse = 0;
723	}	775	}
724		776
725	if (!next->stack)	777	if (!next->cctx)
726	next->stack = stack_get ();
727
728	if (prev__stack != next->stack)
729	{	778	{
730	prev__stack->top_env = PL_top_env;	779	next->cctx = cctx_get ();
731	PL_top_env = next->stack->top_env;	780	assert (!next->cctx->inuse);
732	coro_transfer (&prev__stack->cctx, &next->stack->cctx);	781	next->cctx->inuse = 1;
733	}	782	}
734		783
		784	if (prev__cctx != next->cctx)
		785	{
		786	prev__cctx->top_env = PL_top_env;
		787	PL_top_env = next->cctx->top_env;
		788	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		789	}
		790
735	free_coro_mortal ();	791	free_coro_mortal ();
736
737	UNLOCK;	792	UNLOCK;
738	}	793	}
739	}	794	}
740		795
741	/* use this function pointer to call the above function */
742	/* this is done to increase chances of the compiler not inlining the call */
743	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
744	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
745
746	struct transfer_args	796	struct transfer_args
747	{	797	{
748	struct coro *prev, *next;	798	struct coro *prev, *next;
749	int flags;
750	};	799	};
751		800
752	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)	801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
753		802
754	static void	803	static int
755	coro_state_destroy (struct coro *coro)	804	coro_state_destroy (struct coro *coro)
756	{	805	{
757	if (coro->refcnt--)	806	if (coro->refcnt--)
758	return;	807	return 0;
		808
		809	if (coro->flags & CF_DESTROYED)
		810	return 0;
		811
		812	coro->flags |= CF_DESTROYED;
759		813
760	if (coro->mainstack && coro->mainstack != main_mainstack)	814	if (coro->mainstack && coro->mainstack != main_mainstack)
761	{	815	{
		816	assert (!(coro->flags & CF_RUNNING));
		817
762	struct coro temp;	818	struct coro temp;
		819	Zero (&temp, 1, struct coro);
		820	temp.save = CORO_SAVE_ALL;
763		821
764	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	822	if (coro->flags & CF_RUNNING)
765	LOAD (aTHX_ coro);	823	croak ("FATAL: tried to destroy currently running coroutine");
766		824
		825	save_perl (&temp);
		826	load_perl (coro);
		827
767	destroy_stacks (aTHX);	828	coro_destroy_stacks ();
768		829
769	LOAD ((&temp)); /* this will get rid of defsv etc.. */	830	load_perl (&temp); /* this will get rid of defsv etc.. */
770		831
771	coro->mainstack = 0;	832	coro->mainstack = 0;
772	}	833	}
773		834
774	stack_free (coro->stack);	835	cctx_destroy (coro->cctx);
775	SvREFCNT_dec (coro->args);	836	SvREFCNT_dec (coro->args);
776	Safefree (coro);	837
		838	return 1;
777	}	839	}
778		840
779	static int	841	static int
780	coro_state_clear (SV *sv, MAGIC *mg)	842	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
781	{	843	{
782	struct coro *coro = (struct coro *)mg->mg_ptr;	844	struct coro *coro = (struct coro *)mg->mg_ptr;
783	mg->mg_ptr = 0;	845	mg->mg_ptr = 0;
784		846
785	coro_state_destroy (coro);	847	coro_state_destroy (coro);
786		848
		849	if (!coro->refcnt)
		850	Safefree (coro);
		851
787	return 0;	852	return 0;
788	}	853	}
789		854
790	static int	855	static int
791	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)	856	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
792	{	857	{
793	struct coro *coro = (struct coro *)mg->mg_ptr;	858	struct coro *coro = (struct coro *)mg->mg_ptr;
794		859
795	++coro->refcnt;	860	++coro->refcnt;
796		861
797	return 0;	862	return 0;
798	}	863	}
799		864
800	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	865	static MGVTBL coro_state_vtbl = {
		866	0, 0, 0, 0,
		867	coro_state_clear,
		868	0,
		869	#ifdef MGf_DUP
		870	coro_state_dup,
		871	#else
		872	# define MGf_DUP 0
		873	#endif
		874	};
801		875
802	static struct coro *	876	static struct coro *
803	SvSTATE (SV *coro)	877	SvSTATE (SV *coro)
804	{	878	{
805	HV *stash;	879	HV *stash;
…		…
820	assert (mg->mg_type == PERL_MAGIC_ext);	894	assert (mg->mg_type == PERL_MAGIC_ext);
821	return (struct coro *)mg->mg_ptr;	895	return (struct coro *)mg->mg_ptr;
822	}	896	}
823		897
824	static void	898	static void
825	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev, SV *next, int flags)	899	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
826	{	900	{
827	ta->prev = SvSTATE (prev);	901	ta->prev = SvSTATE (prev_sv);
828	ta->next = SvSTATE (next);	902	ta->next = SvSTATE (next_sv);
829	ta->flags = flags;
830	}	903	}
831		904
832	static void	905	static void
833	api_transfer (SV *prev, SV *next, int flags)	906	api_transfer (SV *prev_sv, SV *next_sv)
834	{	907	{
835	dTHX;
836	struct transfer_args ta;	908	struct transfer_args ta;
837		909
838	prepare_transfer (aTHX_ &ta, prev, next, flags);	910	prepare_transfer (&ta, prev_sv, next_sv);
839	TRANSFER (ta);	911	TRANSFER (ta);
		912	}
		913
		914	static int
		915	api_save (SV *coro_sv, int new_save)
		916	{
		917	struct coro *coro = SvSTATE (coro_sv);
		918	int old_save = coro->save;
		919
		920	if (new_save >= 0)
		921	coro->save = new_save;
		922
		923	return old_save;
840	}	924	}
841		925
842	/** Coro ********************************************************************/	926	/** Coro ********************************************************************/
843		927
844	#define PRIO_MAX 3	928	#define PRIO_MAX 3
…		…
847	#define PRIO_LOW -1	931	#define PRIO_LOW -1
848	#define PRIO_IDLE -3	932	#define PRIO_IDLE -3
849	#define PRIO_MIN -4	933	#define PRIO_MIN -4
850		934
851	/* for Coro.pm */	935	/* for Coro.pm */
852	static GV *coro_current, *coro_idle;	936	static SV *coro_current;
853	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	937	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
854	static int coro_nready;	938	static int coro_nready;
855		939
856	static void	940	static void
857	coro_enq (pTHX_ SV *sv)	941	coro_enq (SV *coro_sv)
858	{	942	{
859	int prio;
860
861	if (SvTYPE (sv) != SVt_PVHV)
862	croak ("Coro::ready tried to enqueue something that is not a coroutine");
863
864	prio = SvSTATE (sv)->prio;
865
866	av_push (coro_ready [prio - PRIO_MIN], sv);	943	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
867	coro_nready++;	944	coro_nready++;
868	}	945	}
869		946
870	static SV *	947	static SV *
871	coro_deq (pTHX_ int min_prio)	948	coro_deq (int min_prio)
872	{	949	{
873	int prio = PRIO_MAX - PRIO_MIN;	950	int prio = PRIO_MAX - PRIO_MIN;
874		951
875	min_prio -= PRIO_MIN;	952	min_prio -= PRIO_MIN;
876	if (min_prio < 0)	953	if (min_prio < 0)
…		…
884	}	961	}
885		962
886	return 0;	963	return 0;
887	}	964	}
888		965
889	static void	966	static int
890	api_ready (SV *coro)	967	api_ready (SV *coro_sv)
891	{	968	{
892	dTHX;	969	struct coro *coro;
893		970
894	if (SvROK (coro))	971	if (SvROK (coro_sv))
895	coro = SvRV (coro);	972	coro_sv = SvRV (coro_sv);
		973
		974	coro = SvSTATE (coro_sv);
		975
		976	if (coro->flags & CF_READY)
		977	return 0;
		978
		979	coro->flags |= CF_READY;
896		980
897	LOCK;	981	LOCK;
898	coro_enq (aTHX_ SvREFCNT_inc (coro));	982	coro_enq (SvREFCNT_inc (coro_sv));
899	UNLOCK;	983	UNLOCK;
900	}
901		984
		985	return 1;
		986	}
		987
902	static void	988	static int
		989	api_is_ready (SV *coro_sv)
		990	{
		991	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		992	}
		993
		994	static void
903	prepare_schedule (aTHX_ struct transfer_args *ta)	995	prepare_schedule (struct transfer_args *ta)
904	{	996	{
905	SV *current, *prev, *next;	997	SV *prev_sv, *next_sv;
		998
		999	for (;;)
		1000	{
		1001	LOCK;
		1002	next_sv = coro_deq (PRIO_MIN);
		1003	UNLOCK;
		1004
		1005	/* nothing to schedule: call the idle handler */
		1006	if (!next_sv)
		1007	{
		1008	dSP;
		1009
		1010	ENTER;
		1011	SAVETMPS;
		1012
		1013	PUSHMARK (SP);
		1014	PUTBACK;
		1015	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1016
		1017	FREETMPS;
		1018	LEAVE;
		1019	continue;
		1020	}
		1021
		1022	ta->next = SvSTATE (next_sv);
		1023
		1024	/* cannot transfer to destroyed coros, skip and look for next */
		1025	if (ta->next->flags & CF_DESTROYED)
		1026	{
		1027	SvREFCNT_dec (next_sv);
		1028	continue;
		1029	}
		1030
		1031	break;
		1032	}
		1033
		1034	/* free this only after the transfer */
		1035	prev_sv = SvRV (coro_current);
		1036	SvRV_set (coro_current, next_sv);
		1037	ta->prev = SvSTATE (prev_sv);
		1038
		1039	assert (ta->next->flags & CF_READY);
		1040	ta->next->flags &= ~CF_READY;
906		1041
907	LOCK;	1042	LOCK;
908
909	current = GvSV (coro_current);
910
911	for (;;)
912	{
913	LOCK;
914
915	next = coro_deq (aTHX_ PRIO_MIN);
916
917	if (next)
918	break;
919
920	UNLOCK;
921
922	{
923	dSP;
924
925	ENTER;
926	SAVETMPS;
927
928	PUSHMARK (SP);
929	PUTBACK;
930	call_sv (GvSV (coro_idle), G_DISCARD);
931
932	FREETMPS;
933	LEAVE;
934	}
935	}
936
937	prev = SvRV (current);
938	SvRV (current) = next;
939
940	/* free this only after the transfer */
941	free_coro_mortal ();	1043	free_coro_mortal ();
942	coro_mortal = prev;	1044	coro_mortal = prev_sv;
943
944	ta->prev = SvSTATE (prev);
945	ta->next = SvSTATE (next);
946	ta->flags = TRANSFER_SAVE_ALL;
947
948	UNLOCK;	1045	UNLOCK;
949	}	1046	}
950		1047
951	static void	1048	static void
952	prepare_cede (aTHX_ struct transfer_args *ta)	1049	prepare_cede (struct transfer_args *ta)
953	{	1050	{
954	LOCK;	1051	api_ready (coro_current);
955	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
956	UNLOCK;
957
958	prepare_schedule (ta);	1052	prepare_schedule (ta);
959	}	1053	}
960		1054
		1055	static int
		1056	prepare_cede_notself (struct transfer_args *ta)
		1057	{
		1058	if (coro_nready)
		1059	{
		1060	SV *prev = SvRV (coro_current);
		1061	prepare_schedule (ta);
		1062	api_ready (prev);
		1063	return 1;
		1064	}
		1065	else
		1066	return 0;
		1067	}
		1068
961	static void	1069	static void
962	api_schedule (void)	1070	api_schedule (void)
963	{	1071	{
964	dTHX;
965	struct transfer_args ta;	1072	struct transfer_args ta;
966		1073
967	prepare_schedule (&ta);	1074	prepare_schedule (&ta);
968	TRANSFER (ta);	1075	TRANSFER (ta);
969	}	1076	}
970		1077
971	static void	1078	static int
972	api_cede (void)	1079	api_cede (void)
973	{	1080	{
974	dTHX;
975	struct transfer_args ta;	1081	struct transfer_args ta;
976		1082
977	prepare_cede (&ta);	1083	prepare_cede (&ta);
		1084
		1085	if (ta.prev != ta.next)
		1086	{
978	TRANSFER (ta);	1087	TRANSFER (ta);
		1088	return 1;
		1089	}
		1090	else
		1091	return 0;
		1092	}
		1093
		1094	static int
		1095	api_cede_notself (void)
		1096	{
		1097	struct transfer_args ta;
		1098
		1099	if (prepare_cede_notself (&ta))
		1100	{
		1101	TRANSFER (ta);
		1102	return 1;
		1103	}
		1104	else
		1105	return 0;
979	}	1106	}
980		1107
981	MODULE = Coro::State PACKAGE = Coro::State	1108	MODULE = Coro::State PACKAGE = Coro::State
982		1109
983	PROTOTYPES: DISABLE	1110	PROTOTYPES: DISABLE
…		…
989	#endif	1116	#endif
990	BOOT_PAGESIZE;	1117	BOOT_PAGESIZE;
991		1118
992	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1119	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
993		1120
994	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1121	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
995	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1122	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
996	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1123	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1124	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1125	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
997		1126
998	main_mainstack = PL_mainstack;	1127	main_mainstack = PL_mainstack;
999		1128
1000	coroapi.ver = CORO_API_VERSION;	1129	coroapi.ver = CORO_API_VERSION;
1001	coroapi.transfer = api_transfer;	1130	coroapi.transfer = api_transfer;
1002
1003	Newz (0, main_stack, 1, coro_stack);
1004	main_stack->idle_sp = (void *)-1;
1005		1131
1006	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1132	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1007	}	1133	}
1008		1134
1009	SV *	1135	SV *
…		…
1014	HV *hv;	1140	HV *hv;
1015	int i;	1141	int i;
1016		1142
1017	Newz (0, coro, 1, struct coro);	1143	Newz (0, coro, 1, struct coro);
1018	coro->args = newAV ();	1144	coro->args = newAV ();
		1145	coro->save = CORO_SAVE_ALL;
		1146	coro->flags = CF_NEW;
1019		1147
1020	hv = newHV ();	1148	hv = newHV ();
1021	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1149	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1022	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1150	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1023		1151
1024	for (i = 1; i < items; i++)	1152	for (i = 1; i < items; i++)
1025	av_push (coro->args, newSVsv (ST (i)));	1153	av_push (coro->args, newSVsv (ST (i)));
1026
1027	coro->stack = main_stack;
1028	/*coro->mainstack = 0; *//*actual work is done inside transfer */
1029	/*coro->stack = 0;*/
1030	}	1154	}
1031	OUTPUT:	1155	OUTPUT:
1032	RETVAL	1156	RETVAL
1033		1157
		1158	int
		1159	save (SV *coro, int new_save = -1)
		1160	CODE:
		1161	RETVAL = api_save (coro, new_save);
		1162	OUTPUT:
		1163	RETVAL
		1164
1034	void	1165	void
1035	transfer (...)	1166	_set_stacklevel (...)
1036	ALIAS:	1167	ALIAS:
1037	Coro::schedule = 1	1168	Coro::State::transfer = 1
1038	Coro::cede = 2	1169	Coro::schedule = 2
1039	_set_stacklevel = 3	1170	Coro::cede = 3
		1171	Coro::cede_notself = 4
1040	CODE:	1172	CODE:
1041	{	1173	{
1042	struct transfer_args ta;	1174	struct transfer_args ta;
1043		1175
1044	switch (ix)	1176	switch (ix)
1045	{	1177	{
1046	case 0:	1178	case 0:
1047	if (items != 3)	1179	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1048	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);	1180	ta.next = 0;
1049
1050	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
1051	break;	1181	break;
1052		1182
1053	case 1:	1183	case 1:
		1184	if (items != 2)
		1185	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1186
		1187	prepare_transfer (&ta, ST (0), ST (1));
		1188	break;
		1189
		1190	case 2:
1054	prepare_schedule (&ta);	1191	prepare_schedule (&ta);
1055	break;	1192	break;
1056		1193
1057	case 2:	1194	case 3:
1058	prepare_cede (&ta);	1195	prepare_cede (&ta);
1059	break;	1196	break;
1060		1197
1061	case 3:	1198	case 4:
1062	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));	1199	if (!prepare_cede_notself (&ta))
1063	ta.next = 0;	1200	XSRETURN_EMPTY;
1064	ta.flags = TRANSFER_SET_STACKLEVEL;	1201
1065	break;	1202	break;
1066	}	1203	}
1067		1204
		1205	BARRIER;
1068	TRANSFER (ta);	1206	TRANSFER (ta);
1069	}	1207	}
1070		1208
1071	void	1209	bool
1072	_clone_state_from (SV *dst, SV *src)	1210	_destroy (SV *coro_sv)
1073	CODE:	1211	CODE:
1074	{	1212	RETVAL = coro_state_destroy (SvSTATE (coro_sv));
1075	struct coro *coro_src = SvSTATE (src);	1213	OUTPUT:
1076		1214	RETVAL
1077	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1078
1079	++coro_src->refcnt;
1080	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1081	}
1082
1083	void
1084	_nonlocal_goto (IV nextop)
1085	CODE:
1086	/* uuh, somebody will kill me again for this */
1087	PL_op->op_next = INT2PTR (OP *, nextop);
1088		1215
1089	void	1216	void
1090	_exit (code)	1217	_exit (code)
1091	int code	1218	int code
1092	PROTOTYPE: $	1219	PROTOTYPE: $
1093	CODE:	1220	CODE:
1094	_exit (code);	1221	_exit (code);
1095		1222
1096	MODULE = Coro::State PACKAGE = Coro::Cont	1223	int
		1224	cctx_count ()
		1225	CODE:
		1226	RETVAL = cctx_count;
		1227	OUTPUT:
		1228	RETVAL
1097		1229
1098	void	1230	int
1099	yield (...)	1231	cctx_idle ()
1100	PROTOTYPE: @	1232	CODE:
1101	CODE:	1233	RETVAL = cctx_idle;
1102	{	1234	OUTPUT:
1103	SV *yieldstack;	1235	RETVAL
1104	SV *sv;
1105	AV *defav = GvAV (PL_defgv);
1106	struct coro *prev, *next;
1107
1108	yieldstack = *hv_fetch (
1109	(HV *)SvRV (GvSV (coro_current)),
1110	"yieldstack", sizeof ("yieldstack") - 1,
1111	0
1112	);
1113
1114	/* set up @_ -- ugly */
1115	av_clear (defav);
1116	av_fill (defav, items - 1);
1117	while (items--)
1118	av_store (defav, items, SvREFCNT_inc (ST(items)));
1119
1120	sv = av_pop ((AV *)SvRV (yieldstack));
1121	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1122	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1123	SvREFCNT_dec (sv);
1124
1125	coro_state_transfer (aTHX_ prev, next, 0);
1126	}
1127		1236
1128	MODULE = Coro::State PACKAGE = Coro	1237	MODULE = Coro::State PACKAGE = Coro
1129		1238
1130	BOOT:	1239	BOOT:
1131	{	1240	{
…		…
1138	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1247	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1139	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1248	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1140	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1249	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1141	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1250	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1142		1251
1143	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1252	coro_current = get_sv ("Coro::current", FALSE);
1144	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1253	SvREADONLY_on (coro_current);
1145		1254
1146	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1255	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1147	coro_ready[i] = newAV ();	1256	coro_ready[i] = newAV ();
1148		1257
1149	{	1258	{
1150	SV *sv = perl_get_sv("Coro::API", 1);	1259	SV *sv = perl_get_sv("Coro::API", 1);
1151		1260
1152	coroapi.schedule = api_schedule;	1261	coroapi.schedule = api_schedule;
		1262	coroapi.save = api_save;
1153	coroapi.cede = api_cede;	1263	coroapi.cede = api_cede;
		1264	coroapi.cede_notself = api_cede_notself;
1154	coroapi.ready = api_ready;	1265	coroapi.ready = api_ready;
		1266	coroapi.is_ready = api_is_ready;
1155	coroapi.nready = &coro_nready;	1267	coroapi.nready = &coro_nready;
1156	coroapi.current = coro_current;	1268	coroapi.current = coro_current;
1157		1269
1158	GCoroAPI = &coroapi;	1270	GCoroAPI = &coroapi;
1159	sv_setiv (sv, (IV)&coroapi);	1271	sv_setiv (sv, (IV)&coroapi);
1160	SvREADONLY_on (sv);	1272	SvREADONLY_on (sv);
1161	}	1273	}
1162	}	1274	}
		1275
		1276	void
		1277	_set_current (SV *current)
		1278	PROTOTYPE: $
		1279	CODE:
		1280	SvREFCNT_dec (SvRV (coro_current));
		1281	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1163		1282
1164	int	1283	int
1165	prio (Coro::State coro, int newprio = 0)	1284	prio (Coro::State coro, int newprio = 0)
1166	ALIAS:	1285	ALIAS:
1167	nice = 1	1286	nice = 1
…		…
1170	RETVAL = coro->prio;	1289	RETVAL = coro->prio;
1171		1290
1172	if (items > 1)	1291	if (items > 1)
1173	{	1292	{
1174	if (ix)	1293	if (ix)
1175	newprio += coro->prio;	1294	newprio = coro->prio - newprio;
1176		1295
1177	if (newprio < PRIO_MIN) newprio = PRIO_MIN;	1296	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1178	if (newprio > PRIO_MAX) newprio = PRIO_MAX;	1297	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1179		1298
1180	coro->prio = newprio;	1299	coro->prio = newprio;
1181	}	1300	}
1182	}	1301	}
		1302	OUTPUT:
		1303	RETVAL
1183		1304
1184	void	1305	SV *
1185	ready (SV *self)	1306	ready (SV *self)
1186	PROTOTYPE: $	1307	PROTOTYPE: $
1187	CODE:	1308	CODE:
1188	api_ready (self);	1309	RETVAL = boolSV (api_ready (self));
		1310	OUTPUT:
		1311	RETVAL
		1312
		1313	SV *
		1314	is_ready (SV *self)
		1315	PROTOTYPE: $
		1316	CODE:
		1317	RETVAL = boolSV (api_is_ready (self));
		1318	OUTPUT:
		1319	RETVAL
1189		1320
1190	int	1321	int
1191	nready (...)	1322	nready (...)
1192	PROTOTYPE:	1323	PROTOTYPE:
1193	CODE:	1324	CODE:
…		…
1199		1330
1200	SV *	1331	SV *
1201	_get_state ()	1332	_get_state ()
1202	CODE:	1333	CODE:
1203	{	1334	{
1204	struct {	1335	struct io_state *data;
1205	int errorno;
1206	int laststype;
1207	int laststatval;
1208	Stat_t statcache;
1209	} data;
1210		1336
		1337	RETVAL = newSV (sizeof (struct io_state));
		1338	data = (struct io_state *)SvPVX (RETVAL);
		1339	SvCUR_set (RETVAL, sizeof (struct io_state));
		1340	SvPOK_only (RETVAL);
		1341
1211	data.errorno = errno;	1342	data->errorno = errno;
1212	data.laststype = PL_laststype;	1343	data->laststype = PL_laststype;
1213	data.laststatval = PL_laststatval;	1344	data->laststatval = PL_laststatval;
1214	data.statcache = PL_statcache;	1345	data->statcache = PL_statcache;
1215
1216	RETVAL = newSVpvn ((char *)&data, sizeof data);
1217	}	1346	}
1218	OUTPUT:	1347	OUTPUT:
1219	RETVAL	1348	RETVAL
1220		1349
1221	void	1350	void
1222	_set_state (char *data_)	1351	_set_state (char *data_)
1223	PROTOTYPE: $	1352	PROTOTYPE: $
1224	CODE:	1353	CODE:
1225	{	1354	{
1226	struct {	1355	struct io_state *data = (void *)data_;
1227	int errorno;
1228	int laststype;
1229	int laststatval;
1230	Stat_t statcache;
1231	} *data = (void *)data_;
1232		1356
1233	errno = data->errorno;	1357	errno = data->errorno;
1234	PL_laststype = data->laststype;	1358	PL_laststype = data->laststype;
1235	PL_laststatval = data->laststatval;	1359	PL_laststatval = data->laststatval;
1236	PL_statcache = data->statcache;	1360	PL_statcache = data->statcache;
1237	}	1361	}
		1362

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