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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.111 by root, Thu Nov 30 18:21:14 2006 UTC vs.
Revision 1.148 by root, Fri Apr 13 12:56:55 2007 UTC

1	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
2		4
3	#include "EXTERN.h"	5	#include "EXTERN.h"
4	#include "perl.h"	6	#include "perl.h"
5	#include "XSUB.h"	7	#include "XSUB.h"
6		8
7	#include "patchlevel.h"	9	#include "patchlevel.h"
8		10
9	#if USE_VALGRIND
10	# include <valgrind/valgrind.h>
11	#endif
12
13	#define PERL_VERSION_ATLEAST(a,b,c) \
14	(PERL_REVISION > (a) \
15	|| (PERL_REVISION == (a) \
16	&& (PERL_VERSION > (b) \
17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
18
19	#if !PERL_VERSION_ATLEAST (5,6,0)
20	# ifndef PL_ppaddr
21	# define PL_ppaddr ppaddr
22	# endif
23	# ifndef call_sv
24	# define call_sv perl_call_sv
25	# endif
26	# ifndef get_sv
27	# define get_sv perl_get_sv
28	# endif
29	# ifndef get_cv
30	# define get_cv perl_get_cv
31	# endif
32	# ifndef IS_PADGV
33	# define IS_PADGV(v) 0
34	# endif
35	# ifndef IS_PADCONST
36	# define IS_PADCONST(v) 0
37	# endif
38	#endif
39
40	#include <stdio.h>	11	#include <stdio.h>
41	#include <errno.h>	12	#include <errno.h>
42		13	#include <assert.h>
43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
44	# undef STACKGUARD
45	#endif
46
47	#ifndef STACKGUARD
48	# define STACKGUARD 0
49	#endif
50		14
51	#ifdef HAVE_MMAP	15	#ifdef HAVE_MMAP
52	# include <unistd.h>	16	# include <unistd.h>
53	# include <sys/mman.h>	17	# include <sys/mman.h>
54	# ifndef MAP_ANONYMOUS	18	# ifndef MAP_ANONYMOUS
…		…
69	#else	33	#else
70	# define PAGESIZE 0	34	# define PAGESIZE 0
71	# define BOOT_PAGESIZE (void)0	35	# define BOOT_PAGESIZE (void)0
72	#endif	36	#endif
73		37
		38	#if CORO_USE_VALGRIND
		39	# include <valgrind/valgrind.h>
		40	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		41	#else
		42	# define REGISTER_STACK(cctx,start,end)
		43	#endif
		44
		45	/* the maximum number of idle cctx that will be pooled */
		46	#define MAX_IDLE_CCTX 8
		47
		48	#define PERL_VERSION_ATLEAST(a,b,c) \
		49	(PERL_REVISION > (a) \
		50	|| (PERL_REVISION == (a) \
		51	&& (PERL_VERSION > (b) \
		52	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		53
		54	#if !PERL_VERSION_ATLEAST (5,6,0)
		55	# ifndef PL_ppaddr
		56	# define PL_ppaddr ppaddr
		57	# endif
		58	# ifndef call_sv
		59	# define call_sv perl_call_sv
		60	# endif
		61	# ifndef get_sv
		62	# define get_sv perl_get_sv
		63	# endif
		64	# ifndef get_cv
		65	# define get_cv perl_get_cv
		66	# endif
		67	# ifndef IS_PADGV
		68	# define IS_PADGV(v) 0
		69	# endif
		70	# ifndef IS_PADCONST
		71	# define IS_PADCONST(v) 0
		72	# endif
		73	#endif
		74
		75	/* 5.8.7 */
		76	#ifndef SvRV_set
		77	# define SvRV_set(s,v) SvRV(s) = (v)
		78	#endif
		79
		80	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		81	# undef CORO_STACKGUARD
		82	#endif
		83
		84	#ifndef CORO_STACKGUARD
		85	# define CORO_STACKGUARD 0
		86	#endif
		87
		88	/* prefer perl internal functions over our own? */
		89	#ifndef CORO_PREFER_PERL_FUNCTIONS
		90	# define CORO_PREFER_PERL_FUNCTIONS 0
		91	#endif
		92
74	/* The next macro should declare a variable stacklevel that contains and approximation	93	/* The next macro should declare a variable stacklevel that contains and approximation
75	* to the current C stack pointer. Its property is that it changes with each call	94	* to the current C stack pointer. Its property is that it changes with each call
76	* and should be unique. */	95	* and should be unique. */
77	#define dSTACKLEVEL int stacklevel	96	#define dSTACKLEVEL int stacklevel
78	#define STACKLEVEL ((void *)&stacklevel)	97	#define STACKLEVEL ((void *)&stacklevel)
79		98
80	#define IN_DESTRUCT (PL_main_cv == Nullcv)	99	#define IN_DESTRUCT (PL_main_cv == Nullcv)
81		100
82	#if __GNUC__ >= 3	101	#if __GNUC__ >= 3
83	# define attribute(x) __attribute__(x)	102	# define attribute(x) __attribute__(x)
		103	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
84	#else	104	#else
85	# define attribute(x)	105	# define attribute(x)
		106	# define BARRIER
86	#endif	107	#endif
87		108
88	#define NOINLINE attribute ((noinline))	109	#define NOINLINE attribute ((noinline))
89		110
90	#include "CoroAPI.h"	111	#include "CoroAPI.h"
91
92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
93		112
94	#ifdef USE_ITHREADS	113	#ifdef USE_ITHREADS
95	static perl_mutex coro_mutex;	114	static perl_mutex coro_mutex;
96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	115	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	116	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
98	#else	117	#else
99	# define LOCK (void)0	118	# define LOCK (void)0
100	# define UNLOCK (void)0	119	# define UNLOCK (void)0
101	#endif	120	#endif
102		121
		122	/* helper storage struct for Coro::AIO */
		123	struct io_state
		124	{
		125	int errorno;
		126	I32 laststype;
		127	int laststatval;
		128	Stat_t statcache;
		129	};
		130
		131	static size_t coro_stacksize = CORO_STACKSIZE;
103	static struct CoroAPI coroapi;	132	static struct CoroAPI coroapi;
104	static AV *main_mainstack; /* used to differentiate between $main and others */	133	static AV *main_mainstack; /* used to differentiate between $main and others */
		134	static JMPENV *main_top_env;
105	static HV *coro_state_stash, *coro_stash;	135	static HV *coro_state_stash, *coro_stash;
106	static SV *coro_mortal; /* will be freed after next transfer */	136	static SV *coro_mortal; /* will be freed after next transfer */
107		137
108	static struct coro_cctx *cctx_first;	138	static struct coro_cctx *cctx_first;
109	static int cctx_count, cctx_idle;	139	static int cctx_count, cctx_idle;
…		…
112	typedef struct coro_cctx {	142	typedef struct coro_cctx {
113	struct coro_cctx *next;	143	struct coro_cctx *next;
114		144
115	/* the stack */	145	/* the stack */
116	void *sptr;	146	void *sptr;
117	long ssize; /* positive == mmap, otherwise malloc */	147	size_t ssize;
118		148
119	/* cpu state */	149	/* cpu state */
120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */	150	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		151	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
121	JMPENV *top_env;	152	JMPENV *top_env;
122	coro_context cctx;	153	coro_context cctx;
123		154
124	int inuse;
125
126	#if USE_VALGRIND	155	#if CORO_USE_VALGRIND
127	int valgrind_id;	156	int valgrind_id;
128	#endif	157	#endif
		158	char inuse, mapped;
129	} coro_cctx;	159	} coro_cctx;
130		160
131	enum {	161	enum {
132	CF_RUNNING, /* coroutine is running */	162	CF_RUNNING = 0x0001, /* coroutine is running */
133	CF_READY, /* coroutine is ready */	163	CF_READY = 0x0002, /* coroutine is ready */
		164	CF_NEW = 0x0004, /* has never been switched to */
		165	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
134	};	166	};
135		167
136	/* this is a structure representing a perl-level coroutine */	168	/* this is a structure representing a perl-level coroutine */
137	struct coro {	169	struct coro {
138	/* the c coroutine allocated to this perl coroutine, if any */	170	/* the c coroutine allocated to this perl coroutine, if any */
139	coro_cctx *cctx;	171	coro_cctx *cctx;
140		172
141	/* data associated with this coroutine (initial args) */	173	/* data associated with this coroutine (initial args) */
142	AV *args;	174	AV *args;
143	int refcnt;	175	int refcnt;
144	int flags;	176	int save; /* CORO_SAVE flags */
		177	int flags; /* CF_ flags */
145		178
146	/* optionally saved, might be zero */	179	/* optionally saved, might be zero */
147	AV *defav;	180	AV *defav; /* @_ */
148	SV *defsv;	181	SV *defsv; /* $_ */
149	SV *errsv;	182	SV *errsv; /* $@ */
		183	GV *deffh; /* default filehandle */
		184	SV *irssv; /* $/ */
		185	SV *irssv_sv; /* real $/ cache */
150		186
151	#define VAR(name,type) type name;	187	#define VAR(name,type) type name;
152	# include "state.h"	188	# include "state.h"
153	#undef VAR	189	#undef VAR
154		190
…		…
157	};	193	};
158		194
159	typedef struct coro *Coro__State;	195	typedef struct coro *Coro__State;
160	typedef struct coro *Coro__State_or_hashref;	196	typedef struct coro *Coro__State_or_hashref;
161		197
		198	/** Coro ********************************************************************/
		199
		200	#define PRIO_MAX 3
		201	#define PRIO_HIGH 1
		202	#define PRIO_NORMAL 0
		203	#define PRIO_LOW -1
		204	#define PRIO_IDLE -3
		205	#define PRIO_MIN -4
		206
		207	/* for Coro.pm */
		208	static SV *coro_current;
		209	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		210	static int coro_nready;
		211
		212	/** lowlevel stuff **********************************************************/
		213
162	static AV *	214	static AV *
163	coro_clone_padlist (CV *cv)	215	coro_clone_padlist (pTHX_ CV *cv)
164	{	216	{
165	AV *padlist = CvPADLIST (cv);	217	AV *padlist = CvPADLIST (cv);
166	AV *newpadlist, *newpad;	218	AV *newpadlist, *newpad;
167		219
168	newpadlist = newAV ();	220	newpadlist = newAV ();
…		…
180		232
181	return newpadlist;	233	return newpadlist;
182	}	234	}
183		235
184	static void	236	static void
185	free_padlist (AV *padlist)	237	free_padlist (pTHX_ AV *padlist)
186	{	238	{
187	/* may be during global destruction */	239	/* may be during global destruction */
188	if (SvREFCNT (padlist))	240	if (SvREFCNT (padlist))
189	{	241	{
190	I32 i = AvFILLp (padlist);	242	I32 i = AvFILLp (padlist);
…		…
211	AV *padlist;	263	AV *padlist;
212	AV *av = (AV *)mg->mg_obj;	264	AV *av = (AV *)mg->mg_obj;
213		265
214	/* casting is fun. */	266	/* casting is fun. */
215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
216	free_padlist (padlist);	268	free_padlist (aTHX_ padlist);
217		269
218	SvREFCNT_dec (av);	270	SvREFCNT_dec (av);
219		271
220	return 0;	272	return 0;
221	}	273	}
…		…
231	: mg_find ((SV *)cv, PERL_MAGIC_coro) \	283	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
232	: 0	284	: 0
233		285
234	/* the next two functions merely cache the padlists */	286	/* the next two functions merely cache the padlists */
235	static void	287	static void
236	get_padlist (CV *cv)	288	get_padlist (pTHX_ CV *cv)
237	{	289	{
238	MAGIC *mg = CORO_MAGIC (cv);	290	MAGIC *mg = CORO_MAGIC (cv);
239	AV *av;	291	AV *av;
240		292
241	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)	293	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
242	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];	294	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
243	else	295	else
244	{	296	{
245	#if 0	297	#if CORO_PREFER_PERL_FUNCTIONS
246	/* this is probably cleaner, but also slower? */	298	/* this is probably cleaner, but also slower? */
247	CV *cp = Perl_cv_clone (cv);	299	CV *cp = Perl_cv_clone (cv);
248	CvPADLIST (cv) = CvPADLIST (cp);	300	CvPADLIST (cv) = CvPADLIST (cp);
249	CvPADLIST (cp) = 0;	301	CvPADLIST (cp) = 0;
250	SvREFCNT_dec (cp);	302	SvREFCNT_dec (cp);
251	#else	303	#else
252	CvPADLIST (cv) = coro_clone_padlist (cv);	304	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
253	#endif	305	#endif
254	}	306	}
255	}	307	}
256		308
257	static void	309	static void
258	put_padlist (CV *cv)	310	put_padlist (pTHX_ CV *cv)
259	{	311	{
260	MAGIC *mg = CORO_MAGIC (cv);	312	MAGIC *mg = CORO_MAGIC (cv);
261	AV *av;	313	AV *av;
262		314
263	if (!mg)	315	if (!mg)
…		…
274	av_extend (av, AvMAX (av) + 1);	326	av_extend (av, AvMAX (av) + 1);
275		327
276	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);	328	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
277	}	329	}
278		330
		331	/** load & save, init *******************************************************/
		332
279	#define SB do {	333	#define SB do {
280	#define SE } while (0)	334	#define SE } while (0)
281		335
282	#define LOAD(state) load_state((state));
283	#define SAVE(state,flags) save_state((state),(flags));
284
285	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	336	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
286		337
287	static void	338	static void
288	load_state(Coro__State c)	339	load_perl (pTHX_ Coro__State c)
289	{	340	{
290	#define VAR(name,type) PL_ ## name = c->name;	341	#define VAR(name,type) PL_ ## name = c->name;
291	# include "state.h"	342	# include "state.h"
292	#undef VAR	343	#undef VAR
293		344
294	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	345	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
295	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	346	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
296	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	347	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		348	if (c->deffh) REPLACE_SV (PL_defoutgv , c->deffh);
		349
		350	if (c->irssv)
		351	{
		352	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		353	{
		354	SvREFCNT_dec (c->irssv);
		355	c->irssv = 0;
		356	}
		357	else
		358	{
		359	REPLACE_SV (PL_rs, c->irssv);
		360	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		361	sv_setsv (c->irssv_sv, PL_rs);
		362	}
		363	}
297		364
298	{	365	{
299	dSP;	366	dSP;
300	CV *cv;	367	CV *cv;
301		368
302	/* now do the ugly restore mess */	369	/* now do the ugly restore mess */
303	while ((cv = (CV *)POPs))	370	while ((cv = (CV *)POPs))
304	{	371	{
305	put_padlist (cv); /* mark this padlist as available */	372	put_padlist (aTHX_ cv); /* mark this padlist as available */
306	CvDEPTH (cv) = PTR2IV (POPs);	373	CvDEPTH (cv) = PTR2IV (POPs);
307	CvPADLIST (cv) = (AV *)POPs;	374	CvPADLIST (cv) = (AV *)POPs;
308	}	375	}
309		376
310	PUTBACK;	377	PUTBACK;
311	}	378	}
		379	assert (!PL_comppad || AvARRAY (PL_comppad));//D
312	}	380	}
313		381
314	static void	382	static void
315	save_state(Coro__State c, int flags)	383	save_perl (pTHX_ Coro__State c)
316	{	384	{
		385	assert (!PL_comppad || AvARRAY (PL_comppad));//D
317	{	386	{
318	dSP;	387	dSP;
319	I32 cxix = cxstack_ix;	388	I32 cxix = cxstack_ix;
320	PERL_CONTEXT *ccstk = cxstack;	389	PERL_CONTEXT *ccstk = cxstack;
321	PERL_SI *top_si = PL_curstackinfo;	390	PERL_SI *top_si = PL_curstackinfo;
…		…
323	/*	392	/*
324	* the worst thing you can imagine happens first - we have to save	393	* the worst thing you can imagine happens first - we have to save
325	* (and reinitialize) all cv's in the whole callchain :(	394	* (and reinitialize) all cv's in the whole callchain :(
326	*/	395	*/
327		396
		397	EXTEND (SP, 3 + 1);
328	PUSHs (Nullsv);	398	PUSHs (Nullsv);
329	/* this loop was inspired by pp_caller */	399	/* this loop was inspired by pp_caller */
330	for (;;)	400	for (;;)
331	{	401	{
332	while (cxix >= 0)	402	while (cxix >= 0)
333	{	403	{
334	PERL_CONTEXT *cx = &ccstk[cxix--];	404	PERL_CONTEXT *cx = &ccstk[cxix--];
335		405
336	if (CxTYPE(cx) == CXt_SUB)	406	if (CxTYPE (cx) == CXt_SUB)
337	{	407	{
338	CV *cv = cx->blk_sub.cv;	408	CV *cv = cx->blk_sub.cv;
339		409
340	if (CvDEPTH (cv))	410	if (CvDEPTH (cv))
341	{	411	{
342	EXTEND (SP, 3);	412	EXTEND (SP, 3);
343
344	PUSHs ((SV *)CvPADLIST(cv));	413	PUSHs ((SV *)CvPADLIST (cv));
345	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));	414	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
346	PUSHs ((SV *)cv);	415	PUSHs ((SV *)cv);
347		416
348	CvDEPTH (cv) = 0;	417	CvDEPTH (cv) = 0;
349	get_padlist (cv);	418	get_padlist (aTHX_ cv);
350	}	419	}
351	}	420	}
352	#ifdef CXt_FORMAT
353	else if (CxTYPE(cx) == CXt_FORMAT)
354	{
355	/* I never used formats, so how should I know how these are implemented? */
356	/* my bold guess is as a simple, plain sub... */
357	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
358	}
359	#endif
360	}	421	}
361		422
362	if (top_si->si_type == PERLSI_MAIN)	423	if (top_si->si_type == PERLSI_MAIN)
363	break;	424	break;
364		425
…		…
368	}	429	}
369		430
370	PUTBACK;	431	PUTBACK;
371	}	432	}
372		433
373	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	434	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
374	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	435	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
375	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	436	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		437	c->deffh = c->save & CORO_SAVE_DEFFH ? (GV *)SvREFCNT_inc (PL_defoutgv) : 0;
		438	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
376		439
377	#define VAR(name,type)c->name = PL_ ## name;	440	#define VAR(name,type)c->name = PL_ ## name;
378	# include "state.h"	441	# include "state.h"
379	#undef VAR	442	#undef VAR
380	}	443	}
…		…
383	* allocate various perl stacks. This is an exact copy	446	* allocate various perl stacks. This is an exact copy
384	* of perl.c:init_stacks, except that it uses less memory	447	* of perl.c:init_stacks, except that it uses less memory
385	* on the (sometimes correct) assumption that coroutines do	448	* on the (sometimes correct) assumption that coroutines do
386	* not usually need a lot of stackspace.	449	* not usually need a lot of stackspace.
387	*/	450	*/
		451	#if CORO_PREFER_PERL_FUNCTIONS
		452	# define coro_init_stacks init_stacks
		453	#else
388	static void	454	static void
389	coro_init_stacks ()	455	coro_init_stacks (pTHX)
390	{	456	{
391	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	457	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
392	PL_curstackinfo->si_type = PERLSI_MAIN;	458	PL_curstackinfo->si_type = PERLSI_MAIN;
393	PL_curstack = PL_curstackinfo->si_stack;	459	PL_curstack = PL_curstackinfo->si_stack;
394	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	460	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
395		461
396	PL_stack_base = AvARRAY(PL_curstack);	462	PL_stack_base = AvARRAY(PL_curstack);
397	PL_stack_sp = PL_stack_base;	463	PL_stack_sp = PL_stack_base;
398	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	464	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
399		465
400	New(50,PL_tmps_stack,96,SV*);	466	New(50,PL_tmps_stack,128,SV*);
401	PL_tmps_floor = -1;	467	PL_tmps_floor = -1;
402	PL_tmps_ix = -1;	468	PL_tmps_ix = -1;
403	PL_tmps_max = 96;	469	PL_tmps_max = 128;
404		470
405	New(54,PL_markstack,16,I32);	471	New(54,PL_markstack,32,I32);
406	PL_markstack_ptr = PL_markstack;	472	PL_markstack_ptr = PL_markstack;
407	PL_markstack_max = PL_markstack + 16;	473	PL_markstack_max = PL_markstack + 32;
408		474
409	#ifdef SET_MARK_OFFSET	475	#ifdef SET_MARK_OFFSET
410	SET_MARK_OFFSET;	476	SET_MARK_OFFSET;
411	#endif	477	#endif
412		478
413	New(54,PL_scopestack,16,I32);	479	New(54,PL_scopestack,32,I32);
414	PL_scopestack_ix = 0;	480	PL_scopestack_ix = 0;
415	PL_scopestack_max = 16;	481	PL_scopestack_max = 32;
416		482
417	New(54,PL_savestack,96,ANY);	483	New(54,PL_savestack,64,ANY);
418	PL_savestack_ix = 0;	484	PL_savestack_ix = 0;
419	PL_savestack_max = 96;	485	PL_savestack_max = 64;
420		486
421	#if !PERL_VERSION_ATLEAST (5,9,0)	487	#if !PERL_VERSION_ATLEAST (5,9,0)
422	New(54,PL_retstack,8,OP*);	488	New(54,PL_retstack,16,OP*);
423	PL_retstack_ix = 0;	489	PL_retstack_ix = 0;
424	PL_retstack_max = 8;	490	PL_retstack_max = 16;
425	#endif	491	#endif
426	}	492	}
		493	#endif
427		494
428	/*	495	/*
429	* destroy the stacks, the callchain etc...	496	* destroy the stacks, the callchain etc...
430	*/	497	*/
431	static void	498	static void
432	coro_destroy_stacks ()	499	coro_destroy_stacks (pTHX)
433	{	500	{
434	if (!IN_DESTRUCT)	501	if (!IN_DESTRUCT)
435	{	502	{
436	/* is this ugly, I ask? */	503	/* restore all saved variables and stuff */
437	LEAVE_SCOPE (0);	504	LEAVE_SCOPE (0);
		505	assert (PL_tmps_floor == -1);
438		506
439	/* sure it is, but more important: is it correct?? :/ */	507	/* free all temporaries */
440	FREETMPS;	508	FREETMPS;
		509	assert (PL_tmps_ix == -1);
441		510
		511	/* unwind all extra stacks */
442	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/	512	POPSTACK_TO (PL_mainstack);
		513
		514	/* unwind main stack */
		515	dounwind (-1);
443	}	516	}
444		517
445	while (PL_curstackinfo->si_next)	518	while (PL_curstackinfo->si_next)
446	PL_curstackinfo = PL_curstackinfo->si_next;	519	PL_curstackinfo = PL_curstackinfo->si_next;
447		520
448	while (PL_curstackinfo)	521	while (PL_curstackinfo)
449	{	522	{
450	PERL_SI *p = PL_curstackinfo->si_prev;	523	PERL_SI *p = PL_curstackinfo->si_prev;
451		524
452	{ /*D*//*remove*/
453	dSP;
454	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
455	PUTBACK; /* possibly superfluous */
456	}
457
458	if (!IN_DESTRUCT)	525	if (!IN_DESTRUCT)
459	{
460	dounwind (-1);/*D*//*remove*/
461	SvREFCNT_dec (PL_curstackinfo->si_stack);	526	SvREFCNT_dec (PL_curstackinfo->si_stack);
462	}
463		527
464	Safefree (PL_curstackinfo->si_cxstack);	528	Safefree (PL_curstackinfo->si_cxstack);
465	Safefree (PL_curstackinfo);	529	Safefree (PL_curstackinfo);
466	PL_curstackinfo = p;	530	PL_curstackinfo = p;
467	}	531	}
…		…
473	#if !PERL_VERSION_ATLEAST (5,9,0)	537	#if !PERL_VERSION_ATLEAST (5,9,0)
474	Safefree (PL_retstack);	538	Safefree (PL_retstack);
475	#endif	539	#endif
476	}	540	}
477		541
		542	/** coroutine stack handling ************************************************/
		543
478	static void	544	static void
479	setup_coro (struct coro *coro)	545	setup_coro (pTHX_ struct coro *coro)
480	{	546	{
481	/*	547	/*
482	* emulate part of the perl startup here.	548	* emulate part of the perl startup here.
483	*/	549	*/
484
485	coro_init_stacks ();	550	coro_init_stacks (aTHX);
486		551
		552	PL_curcop = &PL_compiling;
		553	PL_in_eval = EVAL_NULL;
487	PL_curcop = 0;	554	PL_comppad = 0;
488	PL_in_eval = 0;
489	PL_curpm = 0;	555	PL_curpm = 0;
		556	PL_localizing = 0;
		557	PL_dirty = 0;
		558	PL_restartop = 0;
490		559
491	{	560	{
492	dSP;	561	dSP;
493	LOGOP myop;	562	LOGOP myop;
494		563
495	/* I have no idea why this is needed, but it is */
496	PUSHMARK (SP);
497
498	SvREFCNT_dec (GvAV (PL_defgv));	564	SvREFCNT_dec (GvAV (PL_defgv));
499	GvAV (PL_defgv) = coro->args; coro->args = 0;	565	GvAV (PL_defgv) = coro->args; coro->args = 0;
500		566
501	Zero (&myop, 1, LOGOP);	567	Zero (&myop, 1, LOGOP);
502	myop.op_next = Nullop;	568	myop.op_next = Nullop;
503	myop.op_flags = OPf_WANT_VOID;	569	myop.op_flags = OPf_WANT_VOID;
504		570
505	PL_op = (OP *)&myop;
506
507	PUSHMARK (SP);	571	PUSHMARK (SP);
508	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));	572	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
509	PUTBACK;	573	PUTBACK;
		574	PL_op = (OP *)&myop;
510	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	575	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
511	SPAGAIN;	576	SPAGAIN;
512
513	ENTER; /* necessary e.g. for dounwind */
514	}	577	}
515	}
516		578
		579	ENTER; /* necessary e.g. for dounwind */
		580	}
		581
517	static void	582	static void
518	free_coro_mortal ()	583	free_coro_mortal (pTHX)
519	{	584	{
520	if (coro_mortal)	585	if (coro_mortal)
521	{	586	{
522	SvREFCNT_dec (coro_mortal);	587	SvREFCNT_dec (coro_mortal);
523	coro_mortal = 0;	588	coro_mortal = 0;
524	}	589	}
525	}	590	}
526		591
		592	/* inject a fake call to Coro::State::_cctx_init into the execution */
		593	/* _cctx_init shoukld be careful, as it could be called at almost any time */
		594	/* during execution of a pelr program */
527	static void NOINLINE	595	static void NOINLINE
528	prepare_cctx (coro_cctx *cctx)	596	prepare_cctx (pTHX_ coro_cctx *cctx)
529	{	597	{
530	dSP;	598	dSP;
531	LOGOP myop;	599	LOGOP myop;
532		600
533	Zero (&myop, 1, LOGOP);	601	Zero (&myop, 1, LOGOP);
534	myop.op_next = PL_op;	602	myop.op_next = PL_op;
535	myop.op_flags = OPf_WANT_VOID;	603	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
536
537	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
538		604
539	PUSHMARK (SP);	605	PUSHMARK (SP);
		606	EXTEND (SP, 2);
		607	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
540	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));	608	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
541	PUTBACK;	609	PUTBACK;
		610	PL_op = (OP *)&myop;
542	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);	611	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
543	SPAGAIN;	612	SPAGAIN;
544	}	613	}
545		614
		615	/*
		616	* this is a _very_ stripped down perl interpreter ;)
		617	*/
546	static void	618	static void
547	coro_run (void *arg)	619	coro_run (void *arg)
548	{	620	{
		621	dTHX;
		622
549	/* coro_run is the alternative epilogue of transfer() */	623	/* coro_run is the alternative tail of transfer(), so unlock here. */
550	UNLOCK;	624	UNLOCK;
551		625
552	/*
553	* this is a _very_ stripped down perl interpreter ;)
554	*/
555	PL_top_env = &PL_start_env;	626	PL_top_env = &PL_start_env;
556		627
557	/* inject call to cctx_init */	628	/* inject a fake subroutine call to cctx_init */
558	prepare_cctx ((coro_cctx *)arg);	629	prepare_cctx (aTHX_ (coro_cctx *)arg);
559		630
560	/* somebody will hit me for both perl_run and PL_restartop */	631	/* somebody or something will hit me for both perl_run and PL_restartop */
		632	PL_restartop = PL_op;
561	perl_run (PL_curinterp);	633	perl_run (PL_curinterp);
562		634
563	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);	635	/* If perl-run returns we assume exit() was being called, which */
564	abort ();	636	/* seems to be the only valid (non-bug) reason for perl_run to return. */
		637	/* We try to exit by jumping to the bootstrap-time "top" top_env, as */
		638	/* we cannot restore the "main" coroutine as Coro has no such concept */
		639	PL_top_env = main_top_env;
		640	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
565	}	641	}
566		642
567	static coro_cctx *	643	static coro_cctx *
568	cctx_new ()	644	cctx_new ()
569	{	645	{
570	coro_cctx *cctx;	646	coro_cctx *cctx;
		647	void *stack_start;
		648	size_t stack_size;
571		649
572	++cctx_count;	650	++cctx_count;
573		651
574	New (0, cctx, 1, coro_cctx);	652	Newz (0, cctx, 1, coro_cctx);
575		653
576	#if HAVE_MMAP	654	#if HAVE_MMAP
577		655
578	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;	656	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
579	/* mmap suppsedly does allocate-on-write for us */	657	/* mmap supposedly does allocate-on-write for us */
580	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	658	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
581		659
582	if (cctx->sptr == (void *)-1)	660	if (cctx->sptr != (void *)-1)
583	{
584	perror ("FATAL: unable to mmap stack for coroutine");
585	_exit (EXIT_FAILURE);
586	}	661	{
587
588	# if STACKGUARD	662	# if CORO_STACKGUARD
589	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	663	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
590	# endif	664	# endif
		665	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		666	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		667	cctx->mapped = 1;
		668	}
		669	else
		670	#endif
		671	{
		672	cctx->ssize = coro_stacksize * (long)sizeof (long);
		673	New (0, cctx->sptr, coro_stacksize, long);
591		674
592	#else
593
594	cctx->ssize = STACKSIZE * (long)sizeof (long);
595	New (0, cctx->sptr, STACKSIZE, long);
596
597	if (!cctx->sptr)	675	if (!cctx->sptr)
598	{	676	{
599	perror ("FATAL: unable to malloc stack for coroutine");	677	perror ("FATAL: unable to allocate stack for coroutine");
600	_exit (EXIT_FAILURE);	678	_exit (EXIT_FAILURE);
601	}	679	}
602		680
603	#endif	681	stack_start = cctx->sptr;
		682	stack_size = cctx->ssize;
		683	}
604		684
605	#if USE_VALGRIND	685	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
606	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
607	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
608	cctx->ssize + (char *)cctx->sptr
609	);
610	#endif
611
612	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);	686	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
613		687
614	return cctx;	688	return cctx;
615	}	689	}
616		690
617	static void	691	static void
618	cctx_free (coro_cctx *cctx)	692	cctx_destroy (coro_cctx *cctx)
619	{	693	{
620	if (!cctx)	694	if (!cctx)
621	return;	695	return;
622		696
623	--cctx_count;	697	--cctx_count;
624		698
625	#if USE_VALGRIND	699	#if CORO_USE_VALGRIND
626	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);	700	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
627	#endif	701	#endif
628		702
629	#if HAVE_MMAP	703	#if HAVE_MMAP
		704	if (cctx->mapped)
630	munmap (cctx->sptr, cctx->ssize);	705	munmap (cctx->sptr, cctx->ssize);
631	#else	706	else
		707	#endif
632	Safefree (cctx->sptr);	708	Safefree (cctx->sptr);
633	#endif
634		709
635	Safefree (cctx);	710	Safefree (cctx);
636	}	711	}
637		712
638	static coro_cctx *	713	static coro_cctx *
639	cctx_get ()	714	cctx_get (pTHX)
640	{	715	{
641	coro_cctx *cctx;
642
643	if (cctx_first)	716	while (cctx_first)
644	{	717	{
		718	coro_cctx *cctx = cctx_first;
		719	cctx_first = cctx->next;
645	--cctx_idle;	720	--cctx_idle;
646	cctx = cctx_first;	721
647	cctx_first = cctx->next;	722	if (cctx->ssize >= coro_stacksize)
		723	return cctx;
		724
		725	cctx_destroy (cctx);
648	}	726	}
649	else	727
650	{
651	cctx = cctx_new ();
652	PL_op = PL_op->op_next;	728	PL_op = PL_op->op_next;
653	}
654
655	return cctx;	729	return cctx_new ();
656	}	730	}
657		731
658	static void	732	static void
659	cctx_put (coro_cctx *cctx)	733	cctx_put (coro_cctx *cctx)
660	{	734	{
		735	/* free another cctx if overlimit */
		736	if (cctx_idle >= MAX_IDLE_CCTX)
		737	{
		738	coro_cctx *first = cctx_first;
		739	cctx_first = first->next;
		740	--cctx_idle;
		741
		742	assert (!first->inuse);
		743	cctx_destroy (first);
		744	}
		745
661	++cctx_idle;	746	++cctx_idle;
662	cctx->next = cctx_first;	747	cctx->next = cctx_first;
663	cctx_first = cctx;	748	cctx_first = cctx;
664	}	749	}
665		750
		751	/** coroutine switching *****************************************************/
		752
666	/* never call directly, always through the coro_state_transfer global variable */	753	/* never call directly, always through the coro_state_transfer global variable */
667	static void NOINLINE	754	static void NOINLINE
668	transfer (struct coro *prev, struct coro *next, int flags)	755	transfer (pTHX_ struct coro *prev, struct coro *next)
669	{	756	{
670	dSTACKLEVEL;	757	dSTACKLEVEL;
671		758
672	/* sometimes transfer is only called to set idle_sp */	759	/* sometimes transfer is only called to set idle_sp */
673	if (flags == TRANSFER_SET_STACKLEVEL)	760	if (!next)
		761	{
674	((coro_cctx *)prev)->idle_sp = STACKLEVEL;	762	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		763	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		764	}
675	else if (prev != next)	765	else if (prev != next)
676	{	766	{
677	coro_cctx *prev__cctx;	767	coro_cctx *prev__cctx;
678		768
679	if (!prev->cctx)	769	if (prev->flags & CF_NEW)
680	{	770	{
681	/* create a new empty context */	771	/* create a new empty context */
682	Newz (0, prev->cctx, 1, coro_cctx);	772	Newz (0, prev->cctx, 1, coro_cctx);
683	prev->cctx->inuse = 1;	773	prev->cctx->inuse = 1;
		774	prev->flags &= ~CF_NEW;
684	prev->flags |= CF_RUNNING;	775	prev->flags |= CF_RUNNING;
685	}	776	}
686		777
		778	/*TODO: must not croak here */
687	assert ( prev->flags & CF_RUNNING);	779	if (!prev->flags & CF_RUNNING)
		780	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		781
688	assert (!next->flags & CF_RUNNING);	782	if (next->flags & CF_RUNNING)
		783	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		784
		785	if (next->flags & CF_DESTROYED)
		786	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
689		787
690	prev->flags &= ~CF_RUNNING;	788	prev->flags &= ~CF_RUNNING;
691	next->flags |= CF_RUNNING;	789	next->flags |= CF_RUNNING;
692		790
693	LOCK;	791	LOCK;
694		792
695	if (next->mainstack)	793	if (next->flags & CF_NEW)
696	{	794	{
697	/* coroutine already started */	795	/* need to start coroutine */
698	SAVE (prev, flags);	796	next->flags &= ~CF_NEW;
699	LOAD (next);	797	/* first get rid of the old state */
		798	save_perl (aTHX_ prev);
		799	/* setup coroutine call */
		800	setup_coro (aTHX_ next);
		801	/* need a new stack */
		802	assert (!next->cctx);
700	}	803	}
701	else	804	else
702	{	805	{
703	/* need to start coroutine */	806	/* coroutine already started */
704	/* first get rid of the old state */	807	save_perl (aTHX_ prev);
705	SAVE (prev, -1);	808	load_perl (aTHX_ next);
706	/* setup coroutine call */
707	setup_coro (next);
708	/* need a stack */
709	assert (!next->stack);
710	next->cctx = 0;
711	}	809	}
712		810
713	prev__cctx = prev->cctx;	811	prev__cctx = prev->cctx;
714		812
715	/* possibly "free" the cctx */	813	/* possibly "free" the cctx */
716	if (prev__cctx->idle_sp == STACKLEVEL)	814	if (prev__cctx->idle_sp == STACKLEVEL)
717	{	815	{
718	assert (PL_top_env == prev__cctx->top_env);//D	816	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		817	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		818
		819	prev->cctx = 0;
		820
719	cctx_put (prev__cctx);	821	cctx_put (prev__cctx);
720	prev->cctx = 0;	822	prev__cctx->inuse = 0;
721	}	823	}
722		824
723	if (!next->cctx)	825	if (!next->cctx)
		826	{
724	next->cctx = cctx_get ();	827	next->cctx = cctx_get (aTHX);
		828	assert (!next->cctx->inuse);
		829	next->cctx->inuse = 1;
		830	}
725		831
726	if (prev__cctx != next->cctx)	832	if (prev__cctx != next->cctx)
727	{	833	{
728	assert ( prev__cctx->inuse);
729	assert (!next->cctx->inuse);
730
731	prev__cctx->inuse = 0;
732	next->cctx->inuse = 1;
733
734	prev__cctx->top_env = PL_top_env;	834	prev__cctx->top_env = PL_top_env;
735	PL_top_env = next->cctx->top_env;	835	PL_top_env = next->cctx->top_env;
736	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);	836	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
737	}	837	}
738		838
739	free_coro_mortal ();	839	free_coro_mortal (aTHX);
740
741	UNLOCK;	840	UNLOCK;
742	}	841	}
743	}	842	}
744		843
745	struct transfer_args	844	struct transfer_args
746	{	845	{
747	struct coro *prev, *next;	846	struct coro *prev, *next;
748	int flags;
749	};	847	};
750		848
751	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)	849	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
752		850
		851	/** high level stuff ********************************************************/
		852
753	static void	853	static int
754	coro_state_destroy (struct coro *coro)	854	coro_state_destroy (pTHX_ struct coro *coro)
755	{	855	{
756	if (coro->refcnt--)	856	if (coro->flags & CF_DESTROYED)
757	return;	857	return 0;
		858
		859	coro->flags |= CF_DESTROYED;
		860
		861	if (coro->flags & CF_READY)
		862	{
		863	/* reduce nready, as destroying a ready coro effectively unreadies it */
		864	/* alternative: look through all ready queues and remove the coro */
		865	LOCK;
		866	--coro_nready;
		867	UNLOCK;
		868	}
		869	else
		870	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
758		871
759	if (coro->mainstack && coro->mainstack != main_mainstack)	872	if (coro->mainstack && coro->mainstack != main_mainstack)
760	{	873	{
761	struct coro temp;	874	struct coro temp;
762		875
763	SAVE ((&temp), TRANSFER_SAVE_ALL);	876	assert (!(coro->flags & CF_RUNNING));
764	LOAD (coro);
765		877
		878	Zero (&temp, 1, struct coro);
		879	temp.save = CORO_SAVE_DEF;
		880
		881	if (coro->flags & CF_RUNNING)
		882	croak ("FATAL: tried to destroy currently running coroutine");
		883
		884	save_perl (aTHX_ &temp);
		885	load_perl (aTHX_ coro);
		886
766	coro_destroy_stacks ();	887	coro_destroy_stacks (aTHX);
767		888
768	LOAD ((&temp)); /* this will get rid of defsv etc.. */	889	load_perl (aTHX_ &temp); /* this will get rid of defsv etc.. */
769		890
770	coro->mainstack = 0;	891	coro->mainstack = 0;
771	}	892	}
772		893
773	cctx_free (coro->cctx);	894	cctx_destroy (coro->cctx);
774	SvREFCNT_dec (coro->args);	895	SvREFCNT_dec (coro->args);
775	Safefree (coro);	896
		897	return 1;
776	}	898	}
777		899
778	static int	900	static int
779	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)	901	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
780	{	902	{
781	struct coro *coro = (struct coro *)mg->mg_ptr;	903	struct coro *coro = (struct coro *)mg->mg_ptr;
782	mg->mg_ptr = 0;	904	mg->mg_ptr = 0;
783		905
		906	if (--coro->refcnt < 0)
		907	{
784	coro_state_destroy (coro);	908	coro_state_destroy (aTHX_ coro);
		909	Safefree (coro);
		910	}
785		911
786	return 0;	912	return 0;
787	}	913	}
788		914
789	static int	915	static int
…		…
796	return 0;	922	return 0;
797	}	923	}
798		924
799	static MGVTBL coro_state_vtbl = {	925	static MGVTBL coro_state_vtbl = {
800	0, 0, 0, 0,	926	0, 0, 0, 0,
801	coro_state_clear,	927	coro_state_free,
802	0,	928	0,
803	#ifdef MGf_DUP	929	#ifdef MGf_DUP
804	coro_state_dup,	930	coro_state_dup,
805	#else	931	#else
806	# define MGf_DUP 0	932	# define MGf_DUP 0
807	#endif	933	#endif
808	};	934	};
809		935
810	static struct coro *	936	static struct coro *
811	SvSTATE (SV *coro)	937	SvSTATE_ (pTHX_ SV *coro)
812	{	938	{
813	HV *stash;	939	HV *stash;
814	MAGIC *mg;	940	MAGIC *mg;
815		941
816	if (SvROK (coro))	942	if (SvROK (coro))
…		…
822	/* very slow, but rare, check */	948	/* very slow, but rare, check */
823	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))	949	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
824	croak ("Coro::State object required");	950	croak ("Coro::State object required");
825	}	951	}
826		952
827	mg = SvMAGIC (coro);	953	mg = CORO_MAGIC (coro);
828	assert (mg->mg_type == PERL_MAGIC_ext);
829	return (struct coro *)mg->mg_ptr;	954	return (struct coro *)mg->mg_ptr;
830	}	955	}
831		956
		957	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		958
832	static void	959	static void
833	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)	960	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
834	{	961	{
835	ta->prev = SvSTATE (prev);	962	ta->prev = SvSTATE (prev_sv);
836	ta->next = SvSTATE (next);	963	ta->next = SvSTATE (next_sv);
837	ta->flags = flags;
838	}	964	}
839		965
840	static void	966	static void
841	api_transfer (SV *prev, SV *next, int flags)	967	api_transfer (SV *prev_sv, SV *next_sv)
842	{	968	{
843	dTHX;	969	dTHX;
844	struct transfer_args ta;	970	struct transfer_args ta;
845		971
846	prepare_transfer (&ta, prev, next, flags);	972	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
847	TRANSFER (ta);	973	TRANSFER (ta);
848	}	974	}
849		975
		976	static int
		977	api_save (SV *coro_sv, int new_save)
		978	{
		979	dTHX;
		980	struct coro *coro = SvSTATE (coro_sv);
		981	int old_save = coro->save;
		982
		983	if (new_save >= 0)
		984	coro->save = new_save;
		985
		986	return old_save;
		987	}
		988
850	/** Coro ********************************************************************/	989	/** Coro ********************************************************************/
851		990
852	#define PRIO_MAX 3
853	#define PRIO_HIGH 1
854	#define PRIO_NORMAL 0
855	#define PRIO_LOW -1
856	#define PRIO_IDLE -3
857	#define PRIO_MIN -4
858
859	/* for Coro.pm */
860	static GV *coro_current, *coro_idle;
861	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
862	static int coro_nready;
863
864	static void	991	static void
865	coro_enq (SV *sv)	992	coro_enq (pTHX_ SV *coro_sv)
866	{	993	{
867	int prio;
868
869	if (SvTYPE (sv) != SVt_PVHV)
870	croak ("Coro::ready tried to enqueue something that is not a coroutine");
871
872	prio = SvSTATE (sv)->prio;
873
874	av_push (coro_ready [prio - PRIO_MIN], sv);	994	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
875	coro_nready++;
876	}	995	}
877		996
878	static SV *	997	static SV *
879	coro_deq (int min_prio)	998	coro_deq (pTHX_ int min_prio)
880	{	999	{
881	int prio = PRIO_MAX - PRIO_MIN;	1000	int prio = PRIO_MAX - PRIO_MIN;
882		1001
883	min_prio -= PRIO_MIN;	1002	min_prio -= PRIO_MIN;
884	if (min_prio < 0)	1003	if (min_prio < 0)
885	min_prio = 0;	1004	min_prio = 0;
886		1005
887	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1006	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
888	if (AvFILLp (coro_ready [prio]) >= 0)	1007	if (AvFILLp (coro_ready [prio]) >= 0)
889	{
890	coro_nready--;
891	return av_shift (coro_ready [prio]);	1008	return av_shift (coro_ready [prio]);
892	}
893		1009
894	return 0;	1010	return 0;
895	}	1011	}
896		1012
897	static int	1013	static int
898	api_ready (SV *coro_sv)	1014	api_ready (SV *coro_sv)
899	{	1015	{
		1016	dTHX;
900	struct coro *coro;	1017	struct coro *coro;
901		1018
902	if (SvROK (coro_sv))	1019	if (SvROK (coro_sv))
903	coro_sv = SvRV (coro_sv);	1020	coro_sv = SvRV (coro_sv);
904		1021
905	coro = SvSTATE (coro_sv);	1022	coro = SvSTATE (coro_sv);
		1023
906	if (coro->flags & CF_READY)	1024	if (coro->flags & CF_READY)
907	return 0;	1025	return 0;
908		1026
909	coro->flags |= CF_READY;	1027	coro->flags |= CF_READY;
910		1028
911	LOCK;	1029	LOCK;
912	coro_enq (SvREFCNT_inc (coro_sv));	1030	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1031	++coro_nready;
913	UNLOCK;	1032	UNLOCK;
914		1033
915	return 1;	1034	return 1;
916	}	1035	}
917		1036
918	static int	1037	static int
919	api_is_ready (SV *coro_sv)	1038	api_is_ready (SV *coro_sv)
920	{	1039	{
921	struct coro *coro;	1040	dTHX;
922
923	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1041	return !!(SvSTATE (coro_sv)->flags & CF_READY);
924	}	1042	}
925		1043
926	static void	1044	static void
927	prepare_schedule (struct transfer_args *ta)	1045	prepare_schedule (pTHX_ struct transfer_args *ta)
928	{	1046	{
929	SV *current, *prev, *next;	1047	SV *prev_sv, *next_sv;
930
931	current = GvSV (coro_current);
932		1048
933	for (;;)	1049	for (;;)
934	{	1050	{
935	LOCK;	1051	LOCK;
936	next = coro_deq (PRIO_MIN);	1052	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1053
		1054	/* nothing to schedule: call the idle handler */
		1055	if (!next_sv)
		1056	{
		1057	dSP;
		1058	UNLOCK;
		1059
		1060	ENTER;
		1061	SAVETMPS;
		1062
		1063	PUSHMARK (SP);
		1064	PUTBACK;
		1065	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1066
		1067	FREETMPS;
		1068	LEAVE;
		1069	continue;
		1070	}
		1071
		1072	ta->next = SvSTATE (next_sv);
		1073
		1074	/* cannot transfer to destroyed coros, skip and look for next */
		1075	if (ta->next->flags & CF_DESTROYED)
		1076	{
		1077	UNLOCK;
		1078	SvREFCNT_dec (next_sv);
		1079	/* coro_nready is already taken care of by destroy */
		1080	continue;
		1081	}
		1082
		1083	--coro_nready;
937	UNLOCK;	1084	UNLOCK;
938
939	if (next)
940	break;	1085	break;
941
942	{
943	dSP;
944
945	ENTER;
946	SAVETMPS;
947
948	PUSHMARK (SP);
949	PUTBACK;
950	call_sv (GvSV (coro_idle), G_DISCARD);
951
952	FREETMPS;
953	LEAVE;
954	}	1086	}
955	}
956
957	prev = SvRV (current);
958	SvRV (current) = next;
959		1087
960	/* free this only after the transfer */	1088	/* free this only after the transfer */
		1089	prev_sv = SvRV (coro_current);
		1090	SvRV_set (coro_current, next_sv);
		1091	ta->prev = SvSTATE (prev_sv);
		1092
		1093	assert (ta->next->flags & CF_READY);
		1094	ta->next->flags &= ~CF_READY;
		1095
961	LOCK;	1096	LOCK;
962	free_coro_mortal ();	1097	free_coro_mortal (aTHX);
		1098	coro_mortal = prev_sv;
963	UNLOCK;	1099	UNLOCK;
964	coro_mortal = prev;
965
966	ta->prev = SvSTATE (prev);
967	ta->next = SvSTATE (next);
968	ta->flags = TRANSFER_SAVE_ALL;
969
970	ta->next->flags &= ~CF_READY;
971	}	1100	}
972		1101
973	static void	1102	static void
974	prepare_cede (struct transfer_args *ta)	1103	prepare_cede (pTHX_ struct transfer_args *ta)
975	{	1104	{
976	api_ready (GvSV (coro_current));	1105	api_ready (coro_current);
977
978	prepare_schedule (ta);	1106	prepare_schedule (aTHX_ ta);
		1107	}
		1108
		1109	static int
		1110	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1111	{
		1112	if (coro_nready)
		1113	{
		1114	SV *prev = SvRV (coro_current);
		1115	prepare_schedule (aTHX_ ta);
		1116	api_ready (prev);
		1117	return 1;
		1118	}
		1119	else
		1120	return 0;
979	}	1121	}
980		1122
981	static void	1123	static void
982	api_schedule (void)	1124	api_schedule (void)
983	{	1125	{
984	dTHX;	1126	dTHX;
985	struct transfer_args ta;	1127	struct transfer_args ta;
986		1128
987	prepare_schedule (&ta);	1129	prepare_schedule (aTHX_ &ta);
988	TRANSFER (ta);	1130	TRANSFER (ta);
989	}	1131	}
990		1132
991	static void	1133	static int
992	api_cede (void)	1134	api_cede (void)
993	{	1135	{
994	dTHX;	1136	dTHX;
995	struct transfer_args ta;	1137	struct transfer_args ta;
996		1138
997	prepare_cede (&ta);	1139	prepare_cede (aTHX_ &ta);
		1140
		1141	if (ta.prev != ta.next)
		1142	{
998	TRANSFER (ta);	1143	TRANSFER (ta);
		1144	return 1;
		1145	}
		1146	else
		1147	return 0;
		1148	}
		1149
		1150	static int
		1151	api_cede_notself (void)
		1152	{
		1153	dTHX;
		1154	struct transfer_args ta;
		1155
		1156	if (prepare_cede_notself (aTHX_ &ta))
		1157	{
		1158	TRANSFER (ta);
		1159	return 1;
		1160	}
		1161	else
		1162	return 0;
999	}	1163	}
1000		1164
1001	MODULE = Coro::State PACKAGE = Coro::State	1165	MODULE = Coro::State PACKAGE = Coro::State
1002		1166
1003	PROTOTYPES: DISABLE	1167	PROTOTYPES: DISABLE
…		…
1009	#endif	1173	#endif
1010	BOOT_PAGESIZE;	1174	BOOT_PAGESIZE;
1011		1175
1012	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1176	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
1013		1177
1014	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1178	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
1015	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1179	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
1016	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1180	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1181	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1182	newCONSTSUB (coro_state_stash, "SAVE_DEFFH", newSViv (CORO_SAVE_DEFFH));
		1183	newCONSTSUB (coro_state_stash, "SAVE_DEF", newSViv (CORO_SAVE_DEF));
		1184	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
1017		1185
1018	main_mainstack = PL_mainstack;	1186	main_mainstack = PL_mainstack;
		1187	main_top_env = PL_top_env;
		1188
		1189	while (main_top_env->je_prev)
		1190	main_top_env = main_top_env->je_prev;
1019		1191
1020	coroapi.ver = CORO_API_VERSION;	1192	coroapi.ver = CORO_API_VERSION;
1021	coroapi.transfer = api_transfer;	1193	coroapi.transfer = api_transfer;
1022		1194
1023	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1195	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
…		…
1031	HV *hv;	1203	HV *hv;
1032	int i;	1204	int i;
1033		1205
1034	Newz (0, coro, 1, struct coro);	1206	Newz (0, coro, 1, struct coro);
1035	coro->args = newAV ();	1207	coro->args = newAV ();
		1208	coro->save = CORO_SAVE_DEF;
		1209	coro->flags = CF_NEW;
1036		1210
1037	hv = newHV ();	1211	hv = newHV ();
1038	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1212	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1039	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1213	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1040		1214
1041	for (i = 1; i < items; i++)	1215	for (i = 1; i < items; i++)
1042	av_push (coro->args, newSVsv (ST (i)));	1216	av_push (coro->args, newSVsv (ST (i)));
1043	}	1217	}
1044	OUTPUT:	1218	OUTPUT:
		1219	RETVAL
		1220
		1221	int
		1222	save (SV *coro, int new_save = -1)
		1223	CODE:
		1224	RETVAL = api_save (coro, new_save);
		1225	OUTPUT:
		1226	RETVAL
		1227
		1228	int
		1229	save_also (SV *coro_sv, int save_also)
		1230	CODE:
		1231	{
		1232	struct coro *coro = SvSTATE (coro_sv);
		1233	RETVAL = coro->save;
		1234	coro->save |= save_also;
		1235	}
		1236	OUTPUT:
1045	RETVAL	1237	RETVAL
1046		1238
1047	void	1239	void
1048	_set_stacklevel (...)	1240	_set_stacklevel (...)
1049	ALIAS:	1241	ALIAS:
1050	Coro::State::transfer = 1	1242	Coro::State::transfer = 1
1051	Coro::schedule = 2	1243	Coro::schedule = 2
1052	Coro::cede = 3	1244	Coro::cede = 3
1053	Coro::Cont::yield = 4	1245	Coro::cede_notself = 4
1054	CODE:	1246	CODE:
1055	{	1247	{
1056	struct transfer_args ta;	1248	struct transfer_args ta;
1057		1249
1058	switch (ix)	1250	switch (ix)
1059	{	1251	{
1060	case 0:	1252	case 0:
1061	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));	1253	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1062	ta.next = 0;	1254	ta.next = 0;
1063	ta.flags = TRANSFER_SET_STACKLEVEL;
1064	break;	1255	break;
1065		1256
1066	case 1:	1257	case 1:
1067	if (items != 3)	1258	if (items != 2)
1068	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);	1259	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1069		1260
1070	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));	1261	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
1071	break;	1262	break;
1072		1263
1073	case 2:	1264	case 2:
1074	prepare_schedule (&ta);	1265	prepare_schedule (aTHX_ &ta);
1075	break;	1266	break;
1076		1267
1077	case 3:	1268	case 3:
1078	prepare_cede (&ta);	1269	prepare_cede (aTHX_ &ta);
1079	break;	1270	break;
1080		1271
1081	case 4:	1272	case 4:
1082	{	1273	if (!prepare_cede_notself (aTHX_ &ta))
1083	SV *yieldstack;	1274	XSRETURN_EMPTY;
1084	SV *sv;
1085	AV *defav = GvAV (PL_defgv);
1086		1275
1087	yieldstack = *hv_fetch (
1088	(HV *)SvRV (GvSV (coro_current)),
1089	"yieldstack", sizeof ("yieldstack") - 1,
1090	0
1091	);
1092
1093	/* set up @_ -- ugly */
1094	av_clear (defav);
1095	av_fill (defav, items - 1);
1096	while (items--)
1097	av_store (defav, items, SvREFCNT_inc (ST(items)));
1098
1099	sv = av_pop ((AV *)SvRV (yieldstack));
1100	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1101	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1102	ta.flags = 0;
1103	SvREFCNT_dec (sv);
1104	}
1105	break;	1276	break;
1106
1107	}	1277	}
1108		1278
		1279	BARRIER;
1109	TRANSFER (ta);	1280	TRANSFER (ta);
1110	}
1111		1281
1112	void	1282	if (GIMME_V != G_VOID && ta.next != ta.prev)
1113	_clone_state_from (SV *dst, SV *src)	1283	XSRETURN_YES;
		1284	}
		1285
		1286	bool
		1287	_destroy (SV *coro_sv)
1114	CODE:	1288	CODE:
1115	{	1289	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
1116	struct coro *coro_src = SvSTATE (src);	1290	OUTPUT:
1117		1291	RETVAL
1118	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1119
1120	++coro_src->refcnt;
1121	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1122	}
1123		1292
1124	void	1293	void
1125	_exit (code)	1294	_exit (code)
1126	int code	1295	int code
1127	PROTOTYPE: $	1296	PROTOTYPE: $
1128	CODE:	1297	CODE:
1129	_exit (code);	1298	_exit (code);
1130		1299
1131	int	1300	int
		1301	cctx_stacksize (int new_stacksize = 0)
		1302	CODE:
		1303	RETVAL = coro_stacksize;
		1304	if (new_stacksize)
		1305	coro_stacksize = new_stacksize;
		1306	OUTPUT:
		1307	RETVAL
		1308
		1309	int
1132	cctx_count ()	1310	cctx_count ()
1133	CODE:	1311	CODE:
1134	RETVAL = cctx_count;	1312	RETVAL = cctx_count;
1135	OUTPUT:	1313	OUTPUT:
1136	RETVAL	1314	RETVAL
…		…
1155	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1333	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1156	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1334	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1157	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1335	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1158	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1336	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1159		1337
1160	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1338	coro_current = get_sv ("Coro::current", FALSE);
1161	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1339	SvREADONLY_on (coro_current);
1162		1340
1163	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1341	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1164	coro_ready[i] = newAV ();	1342	coro_ready[i] = newAV ();
1165		1343
1166	{	1344	{
1167	SV *sv = perl_get_sv("Coro::API", 1);	1345	SV *sv = perl_get_sv("Coro::API", 1);
1168		1346
1169	coroapi.schedule = api_schedule;	1347	coroapi.schedule = api_schedule;
		1348	coroapi.save = api_save;
1170	coroapi.cede = api_cede;	1349	coroapi.cede = api_cede;
		1350	coroapi.cede_notself = api_cede_notself;
1171	coroapi.ready = api_ready;	1351	coroapi.ready = api_ready;
1172	coroapi.is_ready = api_is_ready;	1352	coroapi.is_ready = api_is_ready;
1173	coroapi.nready = &coro_nready;	1353	coroapi.nready = &coro_nready;
1174	coroapi.current = coro_current;	1354	coroapi.current = coro_current;
1175		1355
1176	GCoroAPI = &coroapi;	1356	GCoroAPI = &coroapi;
1177	sv_setiv (sv, (IV)&coroapi);	1357	sv_setiv (sv, (IV)&coroapi);
1178	SvREADONLY_on (sv);	1358	SvREADONLY_on (sv);
1179	}	1359	}
1180	}	1360	}
		1361
		1362	void
		1363	_set_current (SV *current)
		1364	PROTOTYPE: $
		1365	CODE:
		1366	SvREFCNT_dec (SvRV (coro_current));
		1367	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1181		1368
1182	int	1369	int
1183	prio (Coro::State coro, int newprio = 0)	1370	prio (Coro::State coro, int newprio = 0)
1184	ALIAS:	1371	ALIAS:
1185	nice = 1	1372	nice = 1
…		…
1188	RETVAL = coro->prio;	1375	RETVAL = coro->prio;
1189		1376
1190	if (items > 1)	1377	if (items > 1)
1191	{	1378	{
1192	if (ix)	1379	if (ix)
1193	newprio += coro->prio;	1380	newprio = coro->prio - newprio;
1194		1381
1195	if (newprio < PRIO_MIN) newprio = PRIO_MIN;	1382	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1196	if (newprio > PRIO_MAX) newprio = PRIO_MAX;	1383	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1197		1384
1198	coro->prio = newprio;	1385	coro->prio = newprio;
1199	}	1386	}
1200	}	1387	}
		1388	OUTPUT:
		1389	RETVAL
1201		1390
1202	SV *	1391	SV *
1203	ready (SV *self)	1392	ready (SV *self)
1204	PROTOTYPE: $	1393	PROTOTYPE: $
1205	CODE:	1394	CODE:
…		…
1227		1416
1228	SV *	1417	SV *
1229	_get_state ()	1418	_get_state ()
1230	CODE:	1419	CODE:
1231	{	1420	{
1232	struct {	1421	struct io_state *data;
1233	int errorno;
1234	int laststype;
1235	int laststatval;
1236	Stat_t statcache;
1237	} data;
1238		1422
		1423	RETVAL = newSV (sizeof (struct io_state));
		1424	data = (struct io_state *)SvPVX (RETVAL);
		1425	SvCUR_set (RETVAL, sizeof (struct io_state));
		1426	SvPOK_only (RETVAL);
		1427
1239	data.errorno = errno;	1428	data->errorno = errno;
1240	data.laststype = PL_laststype;	1429	data->laststype = PL_laststype;
1241	data.laststatval = PL_laststatval;	1430	data->laststatval = PL_laststatval;
1242	data.statcache = PL_statcache;	1431	data->statcache = PL_statcache;
1243
1244	RETVAL = newSVpvn ((char *)&data, sizeof data);
1245	}	1432	}
1246	OUTPUT:	1433	OUTPUT:
1247	RETVAL	1434	RETVAL
1248		1435
1249	void	1436	void
1250	_set_state (char *data_)	1437	_set_state (char *data_)
1251	PROTOTYPE: $	1438	PROTOTYPE: $
1252	CODE:	1439	CODE:
1253	{	1440	{
1254	struct {	1441	struct io_state *data = (void *)data_;
1255	int errorno;
1256	int laststype;
1257	int laststatval;
1258	Stat_t statcache;
1259	} *data = (void *)data_;
1260		1442
1261	errno = data->errorno;	1443	errno = data->errorno;
1262	PL_laststype = data->laststype;	1444	PL_laststype = data->laststype;
1263	PL_laststatval = data->laststatval;	1445	PL_laststatval = data->laststatval;
1264	PL_statcache = data->statcache;	1446	PL_statcache = data->statcache;
1265	}	1447	}
		1448

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