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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.78 by root, Wed Nov 1 01:21:21 2006 UTC vs.
Revision 1.126 by root, Tue Dec 12 04:19:56 2006 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	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
14	# endif	25	# endif
15	# ifndef call_sv	26	# ifndef call_sv
16	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
29	# endif	40	# endif
30	#endif	41	#endif
31		42
		43	/* 5.8.7 */
		44	#ifndef SvRV_set
		45	# define SvRV_set(s,v) SvRV(s) = (v)
		46	#endif
		47
		48	#include <stdio.h>
32	#include <errno.h>	49	#include <errno.h>
		50	#include <assert.h>
33		51
34	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
35	# undef STACKGUARD	53	# undef STACKGUARD
36	#endif	54	#endif
37		55
…		…
53	# ifndef PAGESIZE	71	# ifndef PAGESIZE
54	# define PAGESIZE pagesize	72	# define PAGESIZE pagesize
55	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)	73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
56	static long pagesize;	74	static long pagesize;
57	# else	75	# else
58	# define BOOT_PAGESIZE	76	# define BOOT_PAGESIZE (void)0
59	# endif	77	# endif
		78	#else
		79	# define PAGESIZE 0
		80	# define BOOT_PAGESIZE (void)0
60	#endif	81	#endif
61
62	#define SUB_INIT "Coro::State::initialize"
63	#define UCORO_STATE "_coro_state"
64		82
65	/* The next macro should declare a variable stacklevel that contains and approximation	83	/* The next macro should declare a variable stacklevel that contains and approximation
66	* to the current C stack pointer. Its property is that it changes with each call	84	* to the current C stack pointer. Its property is that it changes with each call
67	* and should be unique. */	85	* and should be unique. */
		86	#define dSTACKLEVEL int stacklevel
68	#define dSTACKLEVEL void *stacklevel = &stacklevel	87	#define STACKLEVEL ((void *)&stacklevel)
69		88
70	#define IN_DESTRUCT (PL_main_cv == Nullcv)	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
71		90
72	#define labs(l) ((l) >= 0 ? (l) : -(l))	91	#if __GNUC__ >= 3
		92	# define attribute(x) __attribute__(x)
		93	#else
		94	# define attribute(x)
		95	#endif
		96
		97	#define NOINLINE attribute ((noinline))
73		98
74	#include "CoroAPI.h"	99	#include "CoroAPI.h"
75		100
76	#ifdef USE_ITHREADS	101	#ifdef USE_ITHREADS
77	static perl_mutex coro_mutex;	102	static perl_mutex coro_mutex;
…		…
80	#else	105	#else
81	# define LOCK (void)0	106	# define LOCK (void)0
82	# define UNLOCK (void)0	107	# define UNLOCK (void)0
83	#endif	108	#endif
84		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
85	static struct CoroAPI coroapi;	118	static struct CoroAPI coroapi;
86	static AV *main_mainstack; /* used to differentiate between $main and others */	119	static AV *main_mainstack; /* used to differentiate between $main and others */
87	static HV *coro_state_stash;	120	static HV *coro_state_stash, *coro_stash;
88	static SV *ucoro_state_sv;
89	static U32 ucoro_state_hash;
90	static SV *coro_mortal; /* will be freed after next transfer */	121	static SV *coro_mortal; /* will be freed after next transfer */
91		122
92	/* this is actually not only the c stack but also c registers etc... */	123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
		126	/* this is a structure representing a c-level coroutine */
93	typedef struct {	127	typedef struct coro_cctx {
94	int refcnt; /* pointer reference counter */	128	struct coro_cctx *next;
95	int usecnt; /* shared by how many coroutines */
96	int gencnt; /* generation counter */
97		129
98	coro_context cctx;	130	/* the stack */
99
100	void *sptr;	131	void *sptr;
101	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
102	} coro_stack;
103		133
		134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
		137	coro_context cctx;
		138
		139	int inuse;
		140
		141	#if USE_VALGRIND
		142	int valgrind_id;
		143	#endif
		144	} coro_cctx;
		145
		146	enum {
		147	CF_RUNNING = 0x0001, /* coroutine is running */
		148	CF_READY = 0x0002, /* coroutine is ready */
		149	CF_NEW = 0x0004, /* ahs never been switched to */
		150	};
		151
		152	/* this is a structure representing a perl-level coroutine */
104	struct coro {	153	struct coro {
105	/* the top-level JMPENV for each coroutine, needed to catch dies. */	154	/* the c coroutine allocated to this perl coroutine, if any */
106	JMPENV start_env;	155	coro_cctx *cctx;
107
108	/* the optional C context */
109	coro_stack *stack;
110	void *cursp;
111	int gencnt;
112
113	/* optionally saved, might be zero */
114	AV *defav;
115	SV *defsv;
116	SV *errsv;
117
118	/* saved global state not related to stacks */
119	U8 dowarn;
120	I32 in_eval;
121
122	/* the stacks and related info (callchain etc..) */
123	PERL_SI *curstackinfo;
124	AV *curstack;
125	AV *mainstack;
126	SV **stack_sp;
127	OP *op;
128	SV **curpad;
129	AV *comppad;
130	CV *compcv;
131	SV **stack_base;
132	SV **stack_max;
133	SV **tmps_stack;
134	I32 tmps_floor;
135	I32 tmps_ix;
136	I32 tmps_max;
137	I32 *markstack;
138	I32 *markstack_ptr;
139	I32 *markstack_max;
140	I32 *scopestack;
141	I32 scopestack_ix;
142	I32 scopestack_max;
143	ANY *savestack;
144	I32 savestack_ix;
145	I32 savestack_max;
146	OP **retstack;
147	I32 retstack_ix;
148	I32 retstack_max;
149	PMOP *curpm;
150	COP *curcop;
151	JMPENV *top_env;
152		156
153	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
154	AV *args;	158	AV *args;
		159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
		162
		163	/* optionally saved, might be zero */
		164	AV *defav; /* @_ */
		165	SV *defsv; /* $_ */
		166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
		169
		170	#define VAR(name,type) type name;
		171	# include "state.h"
		172	#undef VAR
		173
		174	/* coro process data */
		175	int prio;
155	};	176	};
156		177
157	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
158	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
159		180
160	static AV *	181	static AV *
161	coro_clone_padlist (pTHX_ CV *cv)	182	coro_clone_padlist (CV *cv)
162	{	183	{
163	AV *padlist = CvPADLIST (cv);	184	AV *padlist = CvPADLIST (cv);
164	AV *newpadlist, *newpad;	185	AV *newpadlist, *newpad;
165		186
166	newpadlist = newAV ();	187	newpadlist = newAV ();
167	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
		189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
168	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		193	#endif
169	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
170	--AvFILLp (padlist);	195	--AvFILLp (padlist);
171		196
172	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
173	av_store (newpadlist, 1, (SV *)newpad);	198	av_store (newpadlist, 1, (SV *)newpad);
174		199
175	return newpadlist;	200	return newpadlist;
176	}	201	}
177		202
178	static void	203	static void
179	free_padlist (pTHX_ AV *padlist)	204	free_padlist (AV *padlist)
180	{	205	{
181	/* may be during global destruction */	206	/* may be during global destruction */
182	if (SvREFCNT (padlist))	207	if (SvREFCNT (padlist))
183	{	208	{
184	I32 i = AvFILLp (padlist);	209	I32 i = AvFILLp (padlist);
…		…
205	AV *padlist;	230	AV *padlist;
206	AV *av = (AV *)mg->mg_obj;	231	AV *av = (AV *)mg->mg_obj;
207		232
208	/* casting is fun. */	233	/* casting is fun. */
209	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
210	free_padlist (aTHX_ padlist);	235	free_padlist (padlist);
211		236
212	SvREFCNT_dec (av);	237	SvREFCNT_dec (av);
213		238
214	return 0;	239	return 0;
215	}	240	}
216		241
217	#define PERL_MAGIC_coro PERL_MAGIC_ext	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
218		243
219	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
220		245
		246	#define CORO_MAGIC(cv) \
		247	SvMAGIC (cv) \
		248	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		249	? SvMAGIC (cv) \
		250	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		251	: 0
		252
221	/* the next two functions merely cache the padlists */	253	/* the next two functions merely cache the padlists */
222	static void	254	static void
223	get_padlist (pTHX_ CV *cv)	255	get_padlist (CV *cv)
224	{	256	{
225	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
226		259
227	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
228	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
229	else	262	else
230	{	263	{
231	#if 0	264	#if 0
232	/* this should work - but it doesn't :( */	265	/* this is probably cleaner, but also slower? */
233	CV *cp = Perl_cv_clone (aTHX_ cv);	266	CV *cp = Perl_cv_clone (cv);
234	CvPADLIST (cv) = CvPADLIST (cp);	267	CvPADLIST (cv) = CvPADLIST (cp);
235	CvPADLIST (cp) = 0;	268	CvPADLIST (cp) = 0;
236	SvREFCNT_dec (cp);	269	SvREFCNT_dec (cp);
237	#else	270	#else
238	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	271	CvPADLIST (cv) = coro_clone_padlist (cv);
239	#endif	272	#endif
240	}	273	}
241	}	274	}
242		275
243	static void	276	static void
244	put_padlist (pTHX_ CV *cv)	277	put_padlist (CV *cv)
245	{	278	{
246	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
247		281
248	if (!mg)	282	if (!mg)
249	{	283	{
250	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
251	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
252	mg->mg_virtual = &vtbl_coro;	286	mg->mg_virtual = &vtbl_coro;
253	mg->mg_obj = (SV *)newAV ();	287	mg->mg_obj = (SV *)newAV ();
254	}	288	}
255		289
256	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	290	av = (AV *)mg->mg_obj;
		291
		292	if (AvFILLp (av) >= AvMAX (av))
		293	av_extend (av, AvMAX (av) + 1);
		294
		295	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
257	}	296	}
258		297
259	#define SB do {	298	#define SB do {
260	#define SE } while (0)	299	#define SE } while (0)
261		300
262	#define LOAD(state) load_state(aTHX_ (state));
263	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
264
265	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	301	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
266		302
267	static void	303	static void
268	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
269	{	305	{
270	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
271	PL_in_eval = c->in_eval;	307	# include "state.h"
272		308	#undef VAR
273	PL_curstackinfo = c->curstackinfo;
274	PL_curstack = c->curstack;
275	PL_mainstack = c->mainstack;
276	PL_stack_sp = c->stack_sp;
277	PL_op = c->op;
278	PL_curpad = c->curpad;
279	PL_comppad = c->comppad;
280	PL_compcv = c->compcv;
281	PL_stack_base = c->stack_base;
282	PL_stack_max = c->stack_max;
283	PL_tmps_stack = c->tmps_stack;
284	PL_tmps_floor = c->tmps_floor;
285	PL_tmps_ix = c->tmps_ix;
286	PL_tmps_max = c->tmps_max;
287	PL_markstack = c->markstack;
288	PL_markstack_ptr = c->markstack_ptr;
289	PL_markstack_max = c->markstack_max;
290	PL_scopestack = c->scopestack;
291	PL_scopestack_ix = c->scopestack_ix;
292	PL_scopestack_max = c->scopestack_max;
293	PL_savestack = c->savestack;
294	PL_savestack_ix = c->savestack_ix;
295	PL_savestack_max = c->savestack_max;
296	#if PERL_VERSION < 9
297	PL_retstack = c->retstack;
298	PL_retstack_ix = c->retstack_ix;
299	PL_retstack_max = c->retstack_max;
300	#endif
301	PL_curpm = c->curpm;
302	PL_curcop = c->curcop;
303	PL_top_env = c->top_env;
304		309
305	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
306	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
307	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	312	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		313	if (c->irssv)
		314	{
		315	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		316	SvREFCNT_dec (c->irssv);
		317	else
		318	{
		319	REPLACE_SV (PL_rs, c->irssv);
		320	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		321	sv_setsv (c->irssv_sv, PL_rs);
		322	}
		323	}
308		324
309	{	325	{
310	dSP;	326	dSP;
311	CV *cv;	327	CV *cv;
312		328
313	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
314	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
315	{	331	{
316	AV *padlist = (AV *)POPs;
317
318	if (padlist)
319	{
320	put_padlist (aTHX_ cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
321	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
322	}	334	CvPADLIST (cv) = (AV *)POPs;
323
324	++CvDEPTH(cv);
325	}	335	}
326		336
327	PUTBACK;	337	PUTBACK;
328	}	338	}
329	}	339	}
330		340
331	static void	341	static void
332	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
333	{	343	{
334	{	344	{
335	dSP;	345	dSP;
336	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
337	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
340	/*	350	/*
341	* the worst thing you can imagine happens first - we have to save	351	* the worst thing you can imagine happens first - we have to save
342	* (and reinitialize) all cv's in the whole callchain :(	352	* (and reinitialize) all cv's in the whole callchain :(
343	*/	353	*/
344		354
		355	EXTEND (SP, 3 + 1);
345	PUSHs (Nullsv);	356	PUSHs (Nullsv);
346	/* this loop was inspired by pp_caller */	357	/* this loop was inspired by pp_caller */
347	for (;;)	358	for (;;)
348	{	359	{
349	while (cxix >= 0)	360	while (cxix >= 0)
350	{	361	{
351	PERL_CONTEXT *cx = &ccstk[cxix--];	362	PERL_CONTEXT *cx = &ccstk[cxix--];
352		363
353	if (CxTYPE(cx) == CXt_SUB)	364	if (CxTYPE (cx) == CXt_SUB)
354	{	365	{
355	CV *cv = cx->blk_sub.cv;	366	CV *cv = cx->blk_sub.cv;
		367
356	if (CvDEPTH(cv))	368	if (CvDEPTH (cv))
357	{	369	{
358	EXTEND (SP, CvDEPTH(cv)*2);	370	EXTEND (SP, 3);
359
360	while (--CvDEPTH(cv))
361	{
362	/* this tells the restore code to increment CvDEPTH */
363	PUSHs (Nullsv);
364	PUSHs ((SV *)cv);
365	}
366
367	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
368	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
369		374
		375	CvDEPTH (cv) = 0;
370	get_padlist (aTHX_ cv);	376	get_padlist (cv);
371	}	377	}
372	}	378	}
373	#ifdef CXt_FORMAT
374	else if (CxTYPE(cx) == CXt_FORMAT)
375	{
376	/* I never used formats, so how should I know how these are implemented? */
377	/* my bold guess is as a simple, plain sub... */
378	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
379	}
380	#endif
381	}	379	}
382		380
383	if (top_si->si_type == PERLSI_MAIN)	381	if (top_si->si_type == PERLSI_MAIN)
384	break;	382	break;
385		383
…		…
389	}	387	}
390		388
391	PUTBACK;	389	PUTBACK;
392	}	390	}
393		391
394	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	392	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
395	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	393	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
396	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	394	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		395	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
397		396
398	c->dowarn = PL_dowarn;	397	#define VAR(name,type)c->name = PL_ ## name;
399	c->in_eval = PL_in_eval;	398	# include "state.h"
400		399	#undef VAR
401	c->curstackinfo = PL_curstackinfo;
402	c->curstack = PL_curstack;
403	c->mainstack = PL_mainstack;
404	c->stack_sp = PL_stack_sp;
405	c->op = PL_op;
406	c->curpad = PL_curpad;
407	c->comppad = PL_comppad;
408	c->compcv = PL_compcv;
409	c->stack_base = PL_stack_base;
410	c->stack_max = PL_stack_max;
411	c->tmps_stack = PL_tmps_stack;
412	c->tmps_floor = PL_tmps_floor;
413	c->tmps_ix = PL_tmps_ix;
414	c->tmps_max = PL_tmps_max;
415	c->markstack = PL_markstack;
416	c->markstack_ptr = PL_markstack_ptr;
417	c->markstack_max = PL_markstack_max;
418	c->scopestack = PL_scopestack;
419	c->scopestack_ix = PL_scopestack_ix;
420	c->scopestack_max = PL_scopestack_max;
421	c->savestack = PL_savestack;
422	c->savestack_ix = PL_savestack_ix;
423	c->savestack_max = PL_savestack_max;
424	#if PERL_VERSION < 9
425	c->retstack = PL_retstack;
426	c->retstack_ix = PL_retstack_ix;
427	c->retstack_max = PL_retstack_max;
428	#endif
429	c->curpm = PL_curpm;
430	c->curcop = PL_curcop;
431	c->top_env = PL_top_env;
432	}	400	}
433		401
434	/*	402	/*
435	* allocate various perl stacks. This is an exact copy	403	* allocate various perl stacks. This is an exact copy
436	* of perl.c:init_stacks, except that it uses less memory	404	* of perl.c:init_stacks, except that it uses less memory
437	* on the (sometimes correct) assumption that coroutines do	405	* on the (sometimes correct) assumption that coroutines do
438	* not usually need a lot of stackspace.	406	* not usually need a lot of stackspace.
439	*/	407	*/
		408	#if USE_PERL_INIT_STACKS
		409	# define coro_init_stacks init_stacks
		410	#else
		411
440	static void	412	static void
441	coro_init_stacks (pTHX)	413	coro_init_stacks ()
442	{	414	{
443	LOCK;
444
445	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	415	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
446	PL_curstackinfo->si_type = PERLSI_MAIN;	416	PL_curstackinfo->si_type = PERLSI_MAIN;
447	PL_curstack = PL_curstackinfo->si_stack;	417	PL_curstack = PL_curstackinfo->si_stack;
448	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	418	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
449		419
450	PL_stack_base = AvARRAY(PL_curstack);	420	PL_stack_base = AvARRAY(PL_curstack);
451	PL_stack_sp = PL_stack_base;	421	PL_stack_sp = PL_stack_base;
452	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	422	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
453		423
454	New(50,PL_tmps_stack,96,SV*);	424	New(50,PL_tmps_stack,128,SV*);
455	PL_tmps_floor = -1;	425	PL_tmps_floor = -1;
456	PL_tmps_ix = -1;	426	PL_tmps_ix = -1;
457	PL_tmps_max = 96;	427	PL_tmps_max = 128;
458		428
459	New(54,PL_markstack,16,I32);	429	New(54,PL_markstack,32,I32);
460	PL_markstack_ptr = PL_markstack;	430	PL_markstack_ptr = PL_markstack;
461	PL_markstack_max = PL_markstack + 16;	431	PL_markstack_max = PL_markstack + 32;
462		432
463	#ifdef SET_MARK_OFFSET	433	#ifdef SET_MARK_OFFSET
464	SET_MARK_OFFSET;	434	SET_MARK_OFFSET;
465	#endif	435	#endif
466		436
467	New(54,PL_scopestack,16,I32);	437	New(54,PL_scopestack,32,I32);
468	PL_scopestack_ix = 0;	438	PL_scopestack_ix = 0;
469	PL_scopestack_max = 16;	439	PL_scopestack_max = 32;
470		440
471	New(54,PL_savestack,96,ANY);	441	New(54,PL_savestack,64,ANY);
472	PL_savestack_ix = 0;	442	PL_savestack_ix = 0;
473	PL_savestack_max = 96;	443	PL_savestack_max = 64;
474		444
475	#if PERL_VERSION < 9	445	#if !PERL_VERSION_ATLEAST (5,9,0)
476	New(54,PL_retstack,8,OP*);	446	New(54,PL_retstack,16,OP*);
477	PL_retstack_ix = 0;	447	PL_retstack_ix = 0;
478	PL_retstack_max = 8;	448	PL_retstack_max = 16;
479	#endif	449	#endif
480
481	UNLOCK;
482	}	450	}
483		451
484	/*	452	/*
485	* destroy the stacks, the callchain etc...	453	* destroy the stacks, the callchain etc...
486	*/	454	*/
487	static void	455	static void
488	destroy_stacks(pTHX)	456	coro_destroy_stacks ()
489	{	457	{
490	if (!IN_DESTRUCT)	458	if (!IN_DESTRUCT)
491	{	459	{
492	/* is this ugly, I ask? */	460	/* restore all saved variables and stuff */
493	LEAVE_SCOPE (0);	461	LEAVE_SCOPE (0);
		462	assert (PL_tmps_floor == -1);
494		463
495	/* sure it is, but more important: is it correct?? :/ */	464	/* free all temporaries */
496	FREETMPS;	465	FREETMPS;
		466	assert (PL_tmps_ix == -1);
497		467
498	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/	468	POPSTACK_TO (PL_mainstack);
499	}	469	}
500		470
501	while (PL_curstackinfo->si_next)	471	while (PL_curstackinfo->si_next)
502	PL_curstackinfo = PL_curstackinfo->si_next;	472	PL_curstackinfo = PL_curstackinfo->si_next;
503		473
504	while (PL_curstackinfo)	474	while (PL_curstackinfo)
505	{	475	{
506	PERL_SI *p = PL_curstackinfo->si_prev;	476	PERL_SI *p = PL_curstackinfo->si_prev;
507		477
508	{ /*D*//*remove*/
509	dSP;
510	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
511	PUTBACK; /* possibly superfluous */
512	}
513
514	if (!IN_DESTRUCT)	478	if (!IN_DESTRUCT)
515	{
516	dounwind (-1);/*D*//*remove*/
517	SvREFCNT_dec (PL_curstackinfo->si_stack);	479	SvREFCNT_dec (PL_curstackinfo->si_stack);
518	}
519		480
520	Safefree (PL_curstackinfo->si_cxstack);	481	Safefree (PL_curstackinfo->si_cxstack);
521	Safefree (PL_curstackinfo);	482	Safefree (PL_curstackinfo);
522	PL_curstackinfo = p;	483	PL_curstackinfo = p;
523	}	484	}
524		485
525	Safefree (PL_tmps_stack);	486	Safefree (PL_tmps_stack);
526	Safefree (PL_markstack);	487	Safefree (PL_markstack);
527	Safefree (PL_scopestack);	488	Safefree (PL_scopestack);
528	Safefree (PL_savestack);	489	Safefree (PL_savestack);
529	#if PERL_VERSION < 9	490	#if !PERL_VERSION_ATLEAST (5,9,0)
530	Safefree (PL_retstack);	491	Safefree (PL_retstack);
531	#endif	492	#endif
532	}	493	}
533
534	static void
535	allocate_stack (Coro__State ctx, int alloc)
536	{
537	coro_stack *stack;
538
539	New (0, stack, 1, coro_stack);
540
541	stack->refcnt = 1;
542	stack->usecnt = 1;
543	stack->gencnt = ctx->gencnt = 0;
544
545	if (alloc)
546	{
547	#if HAVE_MMAP
548	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */
549	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
550	if (stack->sptr != (void *)-1)
551	{
552	# if STACKGUARD
553	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
554	# endif	494	#endif
555	}
556	else
557	#endif
558	{
559	stack->ssize = - (STACKSIZE * (long)sizeof (long));
560	New (0, stack->sptr, STACKSIZE, long);
561	}
562	}
563	else
564	stack->sptr = 0;
565		495
566	ctx->stack = stack;
567	}
568
569	static void	496	static void
570	deallocate_stack (Coro__State ctx)	497	setup_coro (struct coro *coro)
571	{
572	coro_stack *stack = ctx->stack;
573
574	ctx->stack = 0;
575
576	if (stack)
577	{
578	if (!--stack->refcnt)
579	{
580	#ifdef HAVE_MMAP
581	if (stack->ssize > 0 && stack->sptr)
582	munmap (stack->sptr, stack->ssize);
583	else
584	#endif
585	Safefree (stack->sptr);
586
587	Safefree (stack);
588	}
589	else if (ctx->gencnt == stack->gencnt)
590	--stack->usecnt;
591	}
592	}
593
594	static void
595	setup_coro (void *arg)
596	{	498	{
597	/*	499	/*
598	* emulate part of the perl startup here.	500	* emulate part of the perl startup here.
599	*/	501	*/
600	dTHX;	502
		503	coro_init_stacks ();
		504
		505	PL_curcop = &PL_compiling;
		506	PL_in_eval = EVAL_NULL;
		507	PL_curpm = 0;
		508	PL_localizing = 0;
		509	PL_dirty = 0;
		510	PL_restartop = 0;
		511
		512	{
		513	dSP;
		514	LOGOP myop;
		515
		516	SvREFCNT_dec (GvAV (PL_defgv));
		517	GvAV (PL_defgv) = coro->args; coro->args = 0;
		518
		519	Zero (&myop, 1, LOGOP);
		520	myop.op_next = Nullop;
		521	myop.op_flags = OPf_WANT_VOID;
		522
		523	PUSHMARK (SP);
		524	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		525	PUTBACK;
		526	PL_op = (OP *)&myop;
		527	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		528	SPAGAIN;
		529	}
		530
		531	ENTER; /* necessary e.g. for dounwind */
		532	}
		533
		534	static void
		535	free_coro_mortal ()
		536	{
		537	if (coro_mortal)
		538	{
		539	SvREFCNT_dec (coro_mortal);
		540	coro_mortal = 0;
		541	}
		542	}
		543
		544	/* inject a fake call to Coro::State::_cctx_init into the execution */
		545	static void NOINLINE
		546	prepare_cctx (coro_cctx *cctx)
		547	{
601	dSP;	548	dSP;
602	Coro__State ctx = (Coro__State)arg;	549	LOGOP myop;
603	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
604		550
605	coro_init_stacks (aTHX);	551	Zero (&myop, 1, LOGOP);
606	/*PL_curcop = 0;*/	552	myop.op_next = PL_op;
607	/*PL_in_eval = PL_in_eval;*/ /* inherit */	553	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
608	SvREFCNT_dec (GvAV (PL_defgv));
609	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
610		554
		555	PUSHMARK (SP);
		556	EXTEND (SP, 2);
		557	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		558	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		559	PUTBACK;
		560	PL_op = (OP *)&myop;
		561	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	562	SPAGAIN;
612
613	if (ctx->stack)
614	{
615	ctx->cursp = 0;
616
617	PUSHMARK(SP);
618	PUTBACK;
619	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
620
621	if (SvTRUE (ERRSV))
622	croak (NULL);
623	else
624	croak ("FATAL: CCTXT coroutine returned!");
625	}
626	else
627	{
628	UNOP myop;
629
630	PL_op = (OP *)&myop;
631
632	Zero(&myop, 1, UNOP);
633	myop.op_next = Nullop;
634	myop.op_flags = OPf_WANT_VOID;
635
636	PUSHMARK(SP);
637	XPUSHs (sub_init);
638	/*
639	* the next line is slightly wrong, as PL_op->op_next
640	* is actually being executed so we skip the first op.
641	* that doesn't matter, though, since it is only
642	* pp_nextstate and we never return...
643	* ah yes, and I don't care anyways ;)
644	*/
645	PUTBACK;
646	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
647	SPAGAIN;
648
649	ENTER; /* necessary e.g. for dounwind */
650	}
651	}	563	}
652		564
653	static void	565	static void
654	continue_coro (void *arg)	566	coro_run (void *arg)
655	{	567	{
		568	/* coro_run is the alternative tail of transfer(), so unlock here. */
		569	UNLOCK;
		570
656	/*	571	/*
657	* this is a _very_ stripped down perl interpreter ;)	572	* this is a _very_ stripped down perl interpreter ;)
658	*/	573	*/
659	dTHX;
660	Coro__State ctx = (Coro__State)arg;
661
662	PL_top_env = &ctx->start_env;	574	PL_top_env = &PL_start_env;
663		575
664	ctx->cursp = 0;	576	/* inject call to cctx_init */
665	PL_op = PL_op->op_next;	577	prepare_cctx ((coro_cctx *)arg);
666	CALLRUNOPS(aTHX);
667		578
		579	/* somebody will hit me for both perl_run and PL_restartop */
		580	PL_restartop = PL_op;
		581	perl_run (PL_curinterp);
		582
		583	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
668	abort ();	584	abort ();
669	}	585	}
670		586
		587	static coro_cctx *
		588	cctx_new ()
		589	{
		590	coro_cctx *cctx;
		591
		592	++cctx_count;
		593
		594	Newz (0, cctx, 1, coro_cctx);
		595
		596	#if HAVE_MMAP
		597
		598	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		599	/* mmap supposedly does allocate-on-write for us */
		600	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		601
		602	if (cctx->sptr == (void *)-1)
		603	{
		604	perror ("FATAL: unable to mmap stack for coroutine");
		605	_exit (EXIT_FAILURE);
		606	}
		607
		608	# if STACKGUARD
		609	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		610	# endif
		611
		612	#else
		613
		614	cctx->ssize = STACKSIZE * (long)sizeof (long);
		615	New (0, cctx->sptr, STACKSIZE, long);
		616
		617	if (!cctx->sptr)
		618	{
		619	perror ("FATAL: unable to malloc stack for coroutine");
		620	_exit (EXIT_FAILURE);
		621	}
		622
		623	#endif
		624
		625	#if USE_VALGRIND
		626	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		627	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		628	cctx->ssize + (char *)cctx->sptr
		629	);
		630	#endif
		631
		632	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		633
		634	return cctx;
		635	}
		636
671	static void	637	static void
		638	cctx_destroy (coro_cctx *cctx)
		639	{
		640	if (!cctx)
		641	return;
		642
		643	--cctx_count;
		644
		645	#if USE_VALGRIND
		646	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		647	#endif
		648
		649	#if HAVE_MMAP
		650	munmap (cctx->sptr, cctx->ssize);
		651	#else
		652	Safefree (cctx->sptr);
		653	#endif
		654
		655	Safefree (cctx);
		656	}
		657
		658	static coro_cctx *
		659	cctx_get ()
		660	{
		661	coro_cctx *cctx;
		662
		663	if (cctx_first)
		664	{
		665	cctx = cctx_first;
		666	cctx_first = cctx->next;
		667	--cctx_idle;
		668	}
		669	else
		670	{
		671	cctx = cctx_new ();
		672	PL_op = PL_op->op_next;
		673	}
		674
		675	return cctx;
		676	}
		677
		678	static void
		679	cctx_put (coro_cctx *cctx)
		680	{
		681	/* free another cctx if overlimit */
		682	if (cctx_idle >= MAX_IDLE_CCTX)
		683	{
		684	coro_cctx *first = cctx_first;
		685	cctx_first = first->next;
		686	--cctx_idle;
		687
		688	assert (!first->inuse);
		689	cctx_destroy (first);
		690	}
		691
		692	++cctx_idle;
		693	cctx->next = cctx_first;
		694	cctx_first = cctx;
		695	}
		696
		697	/* never call directly, always through the coro_state_transfer global variable */
		698	static void NOINLINE
672	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)	699	transfer (struct coro *prev, struct coro *next)
673	{	700	{
674	dSTACKLEVEL;	701	dSTACKLEVEL;
675		702
		703	/* sometimes transfer is only called to set idle_sp */
		704	if (!next)
		705	{
		706	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		707	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		708	}
676	if (prev != next)	709	else if (prev != next)
677	{	710	{
678	if (next->mainstack)	711	coro_cctx *prev__cctx;
		712
		713	if (prev->flags & CF_NEW)
679	{	714	{
680	LOCK;	715	/* create a new empty context */
681	SAVE (prev, flags);	716	Newz (0, prev->cctx, 1, coro_cctx);
682	LOAD (next);	717	prev->cctx->inuse = 1;
683	UNLOCK;	718	prev->flags &= ~CF_NEW;
684		719	prev->flags |= CF_RUNNING;
685	/* mark this state as in-use */
686	next->mainstack = 0;
687	next->tmps_ix = -2;
688
689	/* stacklevel changed? if yes, grab the stack for us! */
690	if (flags & TRANSFER_SAVE_CCTXT)
691	{
692	if (!prev->stack)
693	allocate_stack (prev, 0);
694	else if (prev->cursp != stacklevel
695	&& prev->stack->usecnt > 1)
696	{
697	prev->gencnt = ++prev->stack->gencnt;
698	prev->stack->usecnt = 1;
699	}
700
701	/* has our stack been invalidated? */
702	if (next->stack && next->stack->gencnt != next->gencnt)
703	{
704	deallocate_stack (next);
705	allocate_stack (next, 1);
706	coro_create (&(next->stack->cctx),
707	continue_coro, (void *)next,
708	next->stack->sptr, labs (next->stack->ssize));
709	}
710
711	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
712	prev->cursp = stacklevel;
713	/* don't add any code here */
714	}
715	else
716	next->cursp = stacklevel;
717	}	720	}
718	else if (next->tmps_ix == -2)	721
719	croak ("tried to transfer to running coroutine");	722	/*TODO: must not croak here */
		723	if (!prev->flags & CF_RUNNING)
		724	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		725
		726	if (next->flags & CF_RUNNING)
		727	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		728
		729	prev->flags &= ~CF_RUNNING;
		730	next->flags |= CF_RUNNING;
		731
		732	LOCK;
		733
		734	if (next->flags & CF_NEW)
		735	{
		736	/* need to start coroutine */
		737	next->flags &= ~CF_NEW;
		738	/* first get rid of the old state */
		739	save_perl (prev);
		740	/* setup coroutine call */
		741	setup_coro (next);
		742	/* need a new stack */
		743	assert (!next->cctx);
		744	}
720	else	745	else
721	{	746	{
722	LOCK;	747	/* coroutine already started */
723	SAVE (prev, -1); /* first get rid of the old state */	748	save_perl (prev);
724	UNLOCK;	749	load_perl (next);
725
726	if (flags & TRANSFER_SAVE_CCTXT)
727	{
728	if (!prev->stack)
729	allocate_stack (prev, 0);
730
731	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
732	{
733	PL_top_env = &next->start_env;
734
735	setup_coro (next);
736	next->cursp = stacklevel;
737
738	prev->stack->refcnt++;
739	prev->stack->usecnt++;
740	next->stack = prev->stack;
741	next->gencnt = prev->gencnt;
742	}
743	else
744	{
745	assert (!next->stack);
746	allocate_stack (next, 1);
747	coro_create (&(next->stack->cctx),
748	setup_coro, (void *)next,
749	next->stack->sptr, labs (next->stack->ssize));
750	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
751	prev->cursp = stacklevel;
752	/* don't add any code here */
753	}
754	}
755	else
756	{
757	setup_coro (next);
758	next->cursp = stacklevel;
759	}
760	}	750	}
		751
		752	prev__cctx = prev->cctx;
		753
		754	/* possibly "free" the cctx */
		755	if (prev__cctx->idle_sp == STACKLEVEL)
		756	{
		757	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		758	assert (PL_top_env == prev__cctx->top_env);
		759
		760	prev->cctx = 0;
		761
		762	cctx_put (prev__cctx);
		763	prev__cctx->inuse = 0;
		764	}
		765
		766	if (!next->cctx)
		767	{
		768	next->cctx = cctx_get ();
		769	assert (!next->cctx->inuse);
		770	next->cctx->inuse = 1;
		771	}
		772
		773	if (prev__cctx != next->cctx)
		774	{
		775	prev__cctx->top_env = PL_top_env;
		776	PL_top_env = next->cctx->top_env;
		777	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		778	}
		779
		780	free_coro_mortal ();
		781
		782	UNLOCK;
761	}	783	}
		784	}
762		785
763	LOCK;	786	struct transfer_args
764	if (coro_mortal)	787	{
		788	struct coro *prev, *next;
		789	};
		790
		791	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		792
		793	static void
		794	coro_state_destroy (struct coro *coro)
		795	{
		796	if (coro->refcnt--)
		797	return;
		798
		799	if (coro->mainstack && coro->mainstack != main_mainstack)
765	{	800	{
766	SvREFCNT_dec (coro_mortal);	801	struct coro temp;
		802	Zero (&temp, 1, struct coro);
		803	temp.save = CORO_SAVE_ALL;
		804
		805	if (coro->flags & CF_RUNNING)
		806	croak ("FATAL: tried to destroy currently running coroutine");
		807
		808	save_perl (&temp);
		809	load_perl (coro);
		810
		811	coro_destroy_stacks ();
		812
		813	load_perl (&temp); /* this will get rid of defsv etc.. */
		814
767	coro_mortal = 0;	815	coro->mainstack = 0;
768	}	816	}
769	UNLOCK;
770	}
771		817
772	#define SV_CORO(sv,func) \	818	cctx_destroy (coro->cctx);
773	do { \	819	SvREFCNT_dec (coro->args);
774	if (SvROK (sv)) \	820	Safefree (coro);
775	sv = SvRV (sv); \	821	}
776	\
777	if (SvTYPE (sv) == SVt_PVHV) \
778	{ \
779	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
780	\
781	if (!he) \
782	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
783	\
784	(sv) = SvRV (HeVAL(he)); \
785	} \
786	\
787	/* must also be changed inside Coro::Cont::yield */ \
788	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
789	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
790	\
791	} while(0)
792		822
793	#define SvSTATE(sv) INT2PTR (struct coro *, SvIV (sv))
794
795	static void	823	static int
		824	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		825	{
		826	struct coro *coro = (struct coro *)mg->mg_ptr;
		827	mg->mg_ptr = 0;
		828
		829	coro_state_destroy (coro);
		830
		831	return 0;
		832	}
		833
		834	static int
		835	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		836	{
		837	struct coro *coro = (struct coro *)mg->mg_ptr;
		838
		839	++coro->refcnt;
		840
		841	return 0;
		842	}
		843
		844	static MGVTBL coro_state_vtbl = {
		845	0, 0, 0, 0,
		846	coro_state_clear,
		847	0,
		848	#ifdef MGf_DUP
		849	coro_state_dup,
		850	#else
		851	# define MGf_DUP 0
		852	#endif
		853	};
		854
		855	static struct coro *
		856	SvSTATE (SV *coro)
		857	{
		858	HV *stash;
		859	MAGIC *mg;
		860
		861	if (SvROK (coro))
		862	coro = SvRV (coro);
		863
		864	stash = SvSTASH (coro);
		865	if (stash != coro_stash && stash != coro_state_stash)
		866	{
		867	/* very slow, but rare, check */
		868	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		869	croak ("Coro::State object required");
		870	}
		871
		872	mg = SvMAGIC (coro);
		873	assert (mg->mg_type == PERL_MAGIC_ext);
		874	return (struct coro *)mg->mg_ptr;
		875	}
		876
		877	static void
		878	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		879	{
		880	ta->prev = SvSTATE (prev_sv);
		881	ta->next = SvSTATE (next_sv);
		882	}
		883
		884	static void
796	api_transfer(pTHX_ SV *prev, SV *next, int flags)	885	api_transfer (SV *prev_sv, SV *next_sv)
797	{	886	{
798	SV_CORO (prev, "Coro::transfer");	887	struct transfer_args ta;
799	SV_CORO (next, "Coro::transfer");
800		888
801	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	889	prepare_transfer (&ta, prev_sv, next_sv);
		890	TRANSFER (ta);
		891	}
		892
		893	static int
		894	api_save (SV *coro_sv, int new_save)
		895	{
		896	struct coro *coro = SvSTATE (coro_sv);
		897	int old_save = coro->save;
		898
		899	if (new_save >= 0)
		900	coro->save = new_save;
		901
		902	return old_save;
802	}	903	}
803		904
804	/** Coro ********************************************************************/	905	/** Coro ********************************************************************/
805		906
806	#define PRIO_MAX 3	907	#define PRIO_MAX 3
…		…
809	#define PRIO_LOW -1	910	#define PRIO_LOW -1
810	#define PRIO_IDLE -3	911	#define PRIO_IDLE -3
811	#define PRIO_MIN -4	912	#define PRIO_MIN -4
812		913
813	/* for Coro.pm */	914	/* for Coro.pm */
814	static GV *coro_current, *coro_idle;	915	static SV *coro_current;
815	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	916	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
816	static int coro_nready;	917	static int coro_nready;
817		918
818	static void	919	static void
819	coro_enq (pTHX_ SV *sv)	920	coro_enq (SV *coro_sv)
820	{	921	{
821	SV **xprio;
822	int prio;
823
824	if (SvTYPE (sv) != SVt_PVHV)
825	croak ("Coro::ready tried to enqueue something that is not a coroutine");
826
827	xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
828	prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
829
830	prio = prio > PRIO_MAX ? PRIO_MAX
831	: prio < PRIO_MIN ? PRIO_MIN
832	: prio;
833
834	av_push (coro_ready [prio - PRIO_MIN], sv);	922	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
835	coro_nready++;	923	coro_nready++;
836	}	924	}
837		925
838	static SV *	926	static SV *
839	coro_deq (pTHX_ int min_prio)	927	coro_deq (int min_prio)
840	{	928	{
841	int prio = PRIO_MAX - PRIO_MIN;	929	int prio = PRIO_MAX - PRIO_MIN;
842		930
843	min_prio -= PRIO_MIN;	931	min_prio -= PRIO_MIN;
844	if (min_prio < 0)	932	if (min_prio < 0)
845	min_prio = 0;	933	min_prio = 0;
846		934
847	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	935	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
848	if (av_len (coro_ready[prio]) >= 0)	936	if (AvFILLp (coro_ready [prio]) >= 0)
849	{	937	{
850	coro_nready--;	938	coro_nready--;
851	return av_shift (coro_ready[prio]);	939	return av_shift (coro_ready [prio]);
852	}	940	}
853		941
854	return 0;	942	return 0;
855	}	943	}
856		944
857	static void	945	static int
858	api_ready (SV *coro)	946	api_ready (SV *coro_sv)
859	{	947	{
860	dTHX;	948	struct coro *coro;
861		949
862	if (SvROK (coro))	950	if (SvROK (coro_sv))
863	coro = SvRV (coro);	951	coro_sv = SvRV (coro_sv);
		952
		953	coro = SvSTATE (coro_sv);
		954
		955	if (coro->flags & CF_READY)
		956	return 0;
		957
		958	#if 0 /* this is actually harmless */
		959	if (coro->flags & CF_RUNNING)
		960	croak ("Coro::ready called on currently running coroutine");
		961	#endif
		962
		963	coro->flags |= CF_READY;
864		964
865	LOCK;	965	LOCK;
866	coro_enq (aTHX_ SvREFCNT_inc (coro));	966	coro_enq (SvREFCNT_inc (coro_sv));
867	UNLOCK;	967	UNLOCK;
		968
		969	return 1;
		970	}
		971
		972	static int
		973	api_is_ready (SV *coro_sv)
		974	{
		975	return !!SvSTATE (coro_sv)->flags & CF_READY;
		976	}
		977
		978	static void
		979	prepare_schedule (struct transfer_args *ta)
		980	{
		981	SV *prev, *next;
		982
		983	for (;;)
		984	{
		985	LOCK;
		986	next = coro_deq (PRIO_MIN);
		987	UNLOCK;
		988
		989	if (next)
		990	break;
		991
		992	{
		993	dSP;
		994
		995	ENTER;
		996	SAVETMPS;
		997
		998	PUSHMARK (SP);
		999	PUTBACK;
		1000	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1001
		1002	FREETMPS;
		1003	LEAVE;
		1004	}
		1005	}
		1006
		1007	prev = SvRV (coro_current);
		1008	SvRV_set (coro_current, next);
		1009
		1010	/* free this only after the transfer */
		1011	LOCK;
		1012	free_coro_mortal ();
		1013	UNLOCK;
		1014	coro_mortal = prev;
		1015
		1016	assert (!SvROK(prev));//D
		1017	assert (!SvROK(next));//D
		1018
		1019	ta->prev = SvSTATE (prev);
		1020	ta->next = SvSTATE (next);
		1021
		1022	assert (ta->next->flags & CF_READY);
		1023	ta->next->flags &= ~CF_READY;
		1024	}
		1025
		1026	static void
		1027	prepare_cede (struct transfer_args *ta)
		1028	{
		1029	api_ready (coro_current);
		1030
		1031	prepare_schedule (ta);
868	}	1032	}
869		1033
870	static void	1034	static void
871	api_schedule (void)	1035	api_schedule (void)
872	{	1036	{
873	dTHX;	1037	struct transfer_args ta;
874		1038
875	SV *prev, *next;	1039	prepare_schedule (&ta);
876		1040	TRANSFER (ta);
877	LOCK;
878
879	prev = SvRV (GvSV (coro_current));
880	next = coro_deq (aTHX_ PRIO_MIN);
881
882	if (!next)
883	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
884
885	/* free this only after the transfer */
886	coro_mortal = prev;
887	SV_CORO (prev, "Coro::schedule");
888
889	SvRV (GvSV (coro_current)) = next;
890
891	SV_CORO (next, "Coro::schedule");
892
893	UNLOCK;
894
895	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
896	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
897	}	1041	}
898		1042
899	static void	1043	static void
900	api_cede (void)	1044	api_cede (void)
901	{	1045	{
902	dTHX;	1046	struct transfer_args ta;
903		1047
904	LOCK;	1048	prepare_cede (&ta);
905	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1049	TRANSFER (ta);
906	UNLOCK;
907
908	api_schedule ();
909	}	1050	}
910		1051
911	MODULE = Coro::State PACKAGE = Coro::State	1052	MODULE = Coro::State PACKAGE = Coro::State
912		1053
913	PROTOTYPES: ENABLE	1054	PROTOTYPES: DISABLE
914		1055
915	BOOT:	1056	BOOT:
916	{ /* {} necessary for stoopid perl-5.6.x */	1057	{
917	#ifdef USE_ITHREADS	1058	#ifdef USE_ITHREADS
918	MUTEX_INIT (&coro_mutex);	1059	MUTEX_INIT (&coro_mutex);
919	#endif	1060	#endif
920	BOOT_PAGESIZE;	1061	BOOT_PAGESIZE;
921		1062
922	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
923	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
924	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1063	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
925		1064
926	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1065	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
927	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1066	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
928	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1067	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1068	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
929	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1069	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
930		1070
931	main_mainstack = PL_mainstack;	1071	main_mainstack = PL_mainstack;
932		1072
933	coroapi.ver = CORO_API_VERSION;	1073	coroapi.ver = CORO_API_VERSION;
934	coroapi.transfer = api_transfer;	1074	coroapi.transfer = api_transfer;
935	}
936		1075
937	Coro::State	1076	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
938	_newprocess(args)	1077	}
939	SV * args	1078
940	PROTOTYPE: $	1079	SV *
		1080	new (char *klass, ...)
941	CODE:	1081	CODE:
942	Coro__State coro;	1082	{
		1083	struct coro *coro;
		1084	HV *hv;
		1085	int i;
943		1086
944	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
945	croak ("Coro::State::_newprocess expects an arrayref");
946
947	Newz (0, coro, 1, struct coro);	1087	Newz (0, coro, 1, struct coro);
		1088	coro->args = newAV ();
		1089	coro->save = CORO_SAVE_ALL;
		1090	coro->flags = CF_NEW;
948		1091
949	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1092	hv = newHV ();
950	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1093	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
951	/*coro->stack = 0;*/	1094	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
952		1095
953	/* same as JMPENV_BOOTSTRAP */	1096	for (i = 1; i < items; i++)
954	/* we might be able to recycle start_env, but safe is safe */	1097	av_push (coro->args, newSVsv (ST (i)));
955	/*Zero(&coro->start_env, 1, JMPENV);*/	1098	}
956	coro->start_env.je_ret = -1;
957	coro->start_env.je_mustcatch = TRUE;
958
959	RETVAL = coro;
960	OUTPUT:	1099	OUTPUT:
961	RETVAL	1100	RETVAL
962		1101
		1102	int
		1103	save (SV *coro, int new_save = -1)
		1104	CODE:
		1105	RETVAL = api_save (coro, new_save);
		1106	OUTPUT:
		1107	RETVAL
		1108
963	void	1109	void
964	transfer(prev, next, flags)	1110	_set_stacklevel (...)
965	SV *prev	1111	ALIAS:
966	SV *next	1112	Coro::State::transfer = 1
967	int flags	1113	Coro::schedule = 2
968	PROTOTYPE: @	1114	Coro::cede = 3
969	CODE:	1115	CODE:
970	PUTBACK;	1116	{
971	SV_CORO (next, "Coro::transfer");	1117	struct transfer_args ta;
972	SV_CORO (prev, "Coro::transfer");	1118
973	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1119	switch (ix)
974	SPAGAIN;	1120	{
		1121	case 0:
		1122	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1123	ta.next = 0;
		1124	break;
		1125
		1126	case 1:
		1127	if (items != 2)
		1128	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1129
		1130	prepare_transfer (&ta, ST (0), ST (1));
		1131	break;
		1132
		1133	case 2:
		1134	prepare_schedule (&ta);
		1135	break;
		1136
		1137	case 3:
		1138	prepare_cede (&ta);
		1139	break;
		1140	}
		1141
		1142	TRANSFER (ta);
		1143	}
975		1144
976	void	1145	void
977	DESTROY(coro)	1146	_clone_state_from (SV *dst, SV *src)
978	Coro::State coro	1147	CODE:
979	CODE:	1148	{
		1149	struct coro *coro_src = SvSTATE (src);
980		1150
981	if (coro->mainstack && coro->mainstack != main_mainstack)	1151	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
982	{
983	struct coro temp;
984		1152
985	PUTBACK;	1153	++coro_src->refcnt;
986	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1154	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
987	LOAD (aTHX_ coro);	1155	}
988	SPAGAIN;
989
990	destroy_stacks (aTHX);
991
992	LOAD ((&temp)); /* this will get rid of defsv etc.. */
993	SPAGAIN;
994
995	coro->mainstack = 0;
996	}
997
998	deallocate_stack (coro);
999	SvREFCNT_dec (coro->args);
1000	Safefree (coro);
1001		1156
1002	void	1157	void
1003	_exit(code)	1158	_exit (code)
1004	int code	1159	int code
1005	PROTOTYPE: $	1160	PROTOTYPE: $
1006	CODE:	1161	CODE:
1007	_exit (code);	1162	_exit (code);
1008		1163
1009	MODULE = Coro::State PACKAGE = Coro::Cont	1164	int
		1165	cctx_count ()
		1166	CODE:
		1167	RETVAL = cctx_count;
		1168	OUTPUT:
		1169	RETVAL
1010		1170
1011	# this is slightly dirty (should expose a c-level api)	1171	int
1012		1172	cctx_idle ()
1013	void	1173	CODE:
1014	yield(...)	1174	RETVAL = cctx_idle;
1015	PROTOTYPE: @	1175	OUTPUT:
1016	CODE:	1176	RETVAL
1017	SV *yieldstack;
1018	SV *sv;
1019	AV *defav = GvAV (PL_defgv);
1020	struct coro *prev, *next;
1021
1022	yieldstack = *hv_fetch (
1023	(HV *)SvRV (GvSV (coro_current)),
1024	"yieldstack", sizeof ("yieldstack") - 1,
1025	0
1026	);
1027
1028	/* set up @_ -- ugly */
1029	av_clear (defav);
1030	av_fill (defav, items - 1);
1031	while (items--)
1032	av_store (defav, items, SvREFCNT_inc (ST(items)));
1033
1034	sv = av_pop ((AV *)SvRV (yieldstack));
1035	prev = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0))));
1036	next = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0))));
1037	SvREFCNT_dec (sv);
1038
1039	transfer (aTHX_ prev, next, 0);
1040		1177
1041	MODULE = Coro::State PACKAGE = Coro	1178	MODULE = Coro::State PACKAGE = Coro
1042		1179
1043	# this is slightly dirty (should expose a c-level api)
1044
1045	BOOT:	1180	BOOT:
1046	{	1181	{
1047	int i;	1182	int i;
		1183
1048	HV *stash = gv_stashpv ("Coro", TRUE);	1184	coro_stash = gv_stashpv ("Coro", TRUE);
1049		1185
1050	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1186	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1051	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1187	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1052	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1188	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1053	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1189	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1054	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1190	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1055	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1191	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1056		1192
1057	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1193	coro_current = get_sv ("Coro::current", FALSE);
1058	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1194	SvREADONLY_on (coro_current);
1059		1195
1060	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1196	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1061	coro_ready[i] = newAV ();	1197	coro_ready[i] = newAV ();
1062		1198
1063	{	1199	{
1064	SV *sv = perl_get_sv("Coro::API", 1);	1200	SV *sv = perl_get_sv("Coro::API", 1);
1065		1201
1066	coroapi.schedule = api_schedule;	1202	coroapi.schedule = api_schedule;
		1203	coroapi.save = api_save;
1067	coroapi.cede = api_cede;	1204	coroapi.cede = api_cede;
1068	coroapi.ready = api_ready;	1205	coroapi.ready = api_ready;
		1206	coroapi.is_ready = api_is_ready;
1069	coroapi.nready = &coro_nready;	1207	coroapi.nready = &coro_nready;
1070	coroapi.current = coro_current;	1208	coroapi.current = coro_current;
1071		1209
1072	GCoroAPI = &coroapi;	1210	GCoroAPI = &coroapi;
1073	sv_setiv(sv, (IV)&coroapi);	1211	sv_setiv (sv, (IV)&coroapi);
1074	SvREADONLY_on(sv);	1212	SvREADONLY_on (sv);
1075	}	1213	}
1076	}	1214	}
1077		1215
1078	#if !PERL_MICRO
1079
1080	void	1216	void
1081	ready(self)	1217	_set_current (SV *current)
1082	SV * self
1083	PROTOTYPE: $	1218	PROTOTYPE: $
1084	CODE:	1219	CODE:
1085	api_ready (self);	1220	SvREFCNT_dec (SvRV (coro_current));
1086		1221	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1087	#endif
1088		1222
1089	int	1223	int
		1224	prio (Coro::State coro, int newprio = 0)
		1225	ALIAS:
		1226	nice = 1
		1227	CODE:
		1228	{
		1229	RETVAL = coro->prio;
		1230
		1231	if (items > 1)
		1232	{
		1233	if (ix)
		1234	newprio += coro->prio;
		1235
		1236	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1237	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1238
		1239	coro->prio = newprio;
		1240	}
		1241	}
		1242
		1243	SV *
		1244	ready (SV *self)
		1245	PROTOTYPE: $
		1246	CODE:
		1247	RETVAL = boolSV (api_ready (self));
		1248	OUTPUT:
		1249	RETVAL
		1250
		1251	SV *
		1252	is_ready (SV *self)
		1253	PROTOTYPE: $
		1254	CODE:
		1255	RETVAL = boolSV (api_is_ready (self));
		1256	OUTPUT:
		1257	RETVAL
		1258
		1259	int
1090	nready(...)	1260	nready (...)
1091	PROTOTYPE:	1261	PROTOTYPE:
1092	CODE:	1262	CODE:
1093	RETVAL = coro_nready;	1263	RETVAL = coro_nready;
1094	OUTPUT:	1264	OUTPUT:
1095	RETVAL	1265	RETVAL
1096		1266
1097	void	1267	MODULE = Coro::State PACKAGE = Coro::AIO
1098	schedule(...)	1268
1099	PROTOTYPE:	1269	SV *
		1270	_get_state ()
1100	CODE:	1271	CODE:
1101	api_schedule ();
1102
1103	void
1104	cede(...)
1105	PROTOTYPE:
1106	CODE:
1107	api_cede ();
1108
1109	# and these are hacks
1110	SV *
1111	_aio_get_state ()
1112	CODE:
1113	{	1272	{
1114	struct {	1273	struct io_state *data;
1115	int errorno;
1116	int laststype;
1117	int laststatval;
1118	Stat_t statcache;
1119	} data;
1120		1274
		1275	RETVAL = newSV (sizeof (struct io_state));
		1276	data = (struct io_state *)SvPVX (RETVAL);
		1277	SvCUR_set (RETVAL, sizeof (struct io_state));
		1278	SvPOK_only (RETVAL);
		1279
1121	data.errorno = errno;	1280	data->errorno = errno;
1122	data.laststype = PL_laststype;	1281	data->laststype = PL_laststype;
1123	data.laststatval = PL_laststatval;	1282	data->laststatval = PL_laststatval;
1124	data.statcache = PL_statcache;	1283	data->statcache = PL_statcache;
1125
1126	RETVAL = newSVpvn ((char *)&data, sizeof data);
1127	}	1284	}
1128	OUTPUT:	1285	OUTPUT:
1129	RETVAL	1286	RETVAL
1130		1287
1131	void	1288	void
1132	_aio_set_state (char *data_)	1289	_set_state (char *data_)
1133	PROTOTYPE: $	1290	PROTOTYPE: $
1134	CODE:	1291	CODE:
1135	{	1292	{
1136	struct {	1293	struct io_state *data = (void *)data_;
1137	int errorno;
1138	int laststype;
1139	int laststatval;
1140	Stat_t statcache;
1141	} *data = (void *)data_;
1142		1294
1143	errno = data->errorno;	1295	errno = data->errorno;
1144	PL_laststype = data->laststype;	1296	PL_laststype = data->laststype;
1145	PL_laststatval = data->laststatval;	1297	PL_laststatval = data->laststatval;
1146	PL_statcache = data->statcache;	1298	PL_statcache = data->statcache;
1147	}	1299	}
		1300

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