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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.71 by root, Wed Jan 25 21:43:58 2006 UTC vs.
Revision 1.122 by root, Mon Dec 4 13:47:56 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	#include <stdio.h>
32	#include <errno.h>	44	#include <errno.h>
33	#include <signal.h>	45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
34		53
35	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
36	# include <unistd.h>	55	# include <unistd.h>
37	# include <sys/mman.h>	56	# include <sys/mman.h>
38	# ifndef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
…		…
40	# define MAP_ANONYMOUS MAP_ANON	59	# define MAP_ANONYMOUS MAP_ANON
41	# else	60	# else
42	# undef HAVE_MMAP	61	# undef HAVE_MMAP
43	# endif	62	# endif
44	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
45	#endif	71	# endif
46		72	#else
47	#define SUB_INIT "Coro::State::initialize"	73	# define PAGESIZE 0
48	#define UCORO_STATE "_coro_state"	74	# define BOOT_PAGESIZE (void)0
		75	#endif
49		76
50	/* The next macro should declare a variable stacklevel that contains and approximation	77	/* The next macro should declare a variable stacklevel that contains and approximation
51	* to the current C stack pointer. Its property is that it changes with each call	78	* to the current C stack pointer. Its property is that it changes with each call
52	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
53	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
54		82
55	#define IN_DESTRUCT (PL_main_cv == Nullcv)	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
56		84
57	#define labs(l) ((l) >= 0 ? (l) : -(l))	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
58		92
59	#include "CoroAPI.h"	93	#include "CoroAPI.h"
60		94
61	#ifdef USE_ITHREADS	95	#ifdef USE_ITHREADS
62	static perl_mutex coro_mutex;	96	static perl_mutex coro_mutex;
…		…
65	#else	99	#else
66	# define LOCK (void)0	100	# define LOCK (void)0
67	# define UNLOCK (void)0	101	# define UNLOCK (void)0
68	#endif	102	#endif
69		103
		104	struct io_state
		105	{
		106	int errorno;
		107	I32 laststype;
		108	int laststatval;
		109	Stat_t statcache;
		110	};
		111
70	static struct CoroAPI coroapi;	112	static struct CoroAPI coroapi;
71	static AV *main_mainstack; /* used to differentiate between $main and others */	113	static AV *main_mainstack; /* used to differentiate between $main and others */
72	static HV *coro_state_stash;	114	static HV *coro_state_stash, *coro_stash;
73	static SV *ucoro_state_sv;
74	static U32 ucoro_state_hash;
75	static SV *coro_mortal; /* will be freed after next transfer */	115	static SV *coro_mortal; /* will be freed after next transfer */
76		116
77	/* this is actually not only the c stack but also c registers etc... */	117	static struct coro_cctx *cctx_first;
		118	static int cctx_count, cctx_idle;
		119
		120	/* this is a structure representing a c-level coroutine */
78	typedef struct {	121	typedef struct coro_cctx {
79	int refcnt; /* pointer reference counter */	122	struct coro_cctx *next;
80	int usecnt; /* shared by how many coroutines */
81	int gencnt; /* generation counter */
82		123
83	coro_context cctx;	124	/* the stack */
84
85	void *sptr;	125	void *sptr;
86	long ssize; /* positive == mmap, otherwise malloc */	126	long ssize; /* positive == mmap, otherwise malloc */
87	} coro_stack;
88		127
		128	/* cpu state */
		129	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		130	JMPENV *top_env;
		131	coro_context cctx;
		132
		133	int inuse;
		134
		135	#if USE_VALGRIND
		136	int valgrind_id;
		137	#endif
		138	} coro_cctx;
		139
		140	enum {
		141	CF_RUNNING = 0x0001, /* coroutine is running */
		142	CF_READY = 0x0002, /* coroutine is ready */
		143	CF_NEW = 0x0004, /* ahs never been switched to */
		144	};
		145
		146	/* this is a structure representing a perl-level coroutine */
89	struct coro {	147	struct coro {
90	/* the top-level JMPENV for each coroutine, needed to catch dies. */	148	/* the c coroutine allocated to this perl coroutine, if any */
91	JMPENV start_env;	149	coro_cctx *cctx;
92
93	/* the optional C context */
94	coro_stack *stack;
95	void *cursp;
96	int gencnt;
97
98	/* optionally saved, might be zero */
99	AV *defav;
100	SV *defsv;
101	SV *errsv;
102
103	/* saved global state not related to stacks */
104	U8 dowarn;
105	I32 in_eval;
106
107	/* the stacks and related info (callchain etc..) */
108	PERL_SI *curstackinfo;
109	AV *curstack;
110	AV *mainstack;
111	SV **stack_sp;
112	OP *op;
113	SV **curpad;
114	AV *comppad;
115	CV *compcv;
116	SV **stack_base;
117	SV **stack_max;
118	SV **tmps_stack;
119	I32 tmps_floor;
120	I32 tmps_ix;
121	I32 tmps_max;
122	I32 *markstack;
123	I32 *markstack_ptr;
124	I32 *markstack_max;
125	I32 *scopestack;
126	I32 scopestack_ix;
127	I32 scopestack_max;
128	ANY *savestack;
129	I32 savestack_ix;
130	I32 savestack_max;
131	OP **retstack;
132	I32 retstack_ix;
133	I32 retstack_max;
134	PMOP *curpm;
135	COP *curcop;
136	JMPENV *top_env;
137		150
138	/* data associated with this coroutine (initial args) */	151	/* data associated with this coroutine (initial args) */
139	AV *args;	152	AV *args;
		153	int refcnt;
		154	int save; /* CORO_SAVE flags */
		155	int flags; /* CF_ flags */
		156
		157	/* optionally saved, might be zero */
		158	AV *defav; /* @_ */
		159	SV *defsv; /* $_ */
		160	SV *errsv; /* $@ */
		161	SV *irssv; /* $/ */
		162
		163	#define VAR(name,type) type name;
		164	# include "state.h"
		165	#undef VAR
		166
		167	/* coro process data */
		168	int prio;
140	};	169	};
141		170
142	typedef struct coro *Coro__State;	171	typedef struct coro *Coro__State;
143	typedef struct coro *Coro__State_or_hashref;	172	typedef struct coro *Coro__State_or_hashref;
144		173
145	/* mostly copied from op.c:cv_clone2 */	174	static AV *
146	STATIC AV *	175	coro_clone_padlist (CV *cv)
147	clone_padlist (pTHX_ AV *protopadlist)
148	{	176	{
149	AV *av;	177	AV *padlist = CvPADLIST (cv);
150	I32 ix;
151	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
152	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
153	SV **pname = AvARRAY (protopad_name);
154	SV **ppad = AvARRAY (protopad);
155	I32 fname = AvFILLp (protopad_name);
156	I32 fpad = AvFILLp (protopad);
157	AV *newpadlist, *newpad_name, *newpad;	178	AV *newpadlist, *newpad;
158	SV **npad;
159
160	newpad_name = newAV ();
161	for (ix = fname; ix >= 0; ix--)
162	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
163
164	newpad = newAV ();
165	av_fill (newpad, AvFILLp (protopad));
166	npad = AvARRAY (newpad);
167		179
168	newpadlist = newAV ();	180	newpadlist = newAV ();
169	AvREAL_off (newpadlist);	181	AvREAL_off (newpadlist);
170	av_store (newpadlist, 0, (SV *) newpad_name);	182	#if PERL_VERSION_ATLEAST (5,9,0)
		183	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		184	#else
		185	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		186	#endif
		187	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		188	--AvFILLp (padlist);
		189
		190	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
171	av_store (newpadlist, 1, (SV *) newpad);	191	av_store (newpadlist, 1, (SV *)newpad);
172
173	av = newAV (); /* will be @_ */
174	av_extend (av, 0);
175	av_store (newpad, 0, (SV *) av);
176	AvREIFY_on (av);
177
178	for (ix = fpad; ix > 0; ix--)
179	{
180	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
181
182	if (namesv && namesv != &PL_sv_undef)
183	{
184	char *name = SvPVX (namesv); /* XXX */
185
186	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
187	{ /* lexical from outside? */
188	npad[ix] = SvREFCNT_inc (ppad[ix]);
189	}
190	else
191	{ /* our own lexical */
192	SV *sv;
193	if (*name == '&')
194	sv = SvREFCNT_inc (ppad[ix]);
195	else if (*name == '@')
196	sv = (SV *) newAV ();
197	else if (*name == '%')
198	sv = (SV *) newHV ();
199	else
200	sv = NEWSV (0, 0);
201
202	#ifdef SvPADBUSY
203	if (!SvPADBUSY (sv))
204	#endif
205	SvPADMY_on (sv);
206
207	npad[ix] = sv;
208	}
209	}
210	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
211	{
212	npad[ix] = SvREFCNT_inc (ppad[ix]);
213	}
214	else
215	{
216	SV *sv = NEWSV (0, 0);
217	SvPADTMP_on (sv);
218	npad[ix] = sv;
219	}
220	}
221
222	#if 0 /* return -ENOTUNDERSTOOD */
223	/* Now that vars are all in place, clone nested closures. */
224
225	for (ix = fpad; ix > 0; ix--) {
226	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
227	if (namesv
228	&& namesv != &PL_sv_undef
229	&& !(SvFLAGS(namesv) & SVf_FAKE)
230	&& *SvPVX(namesv) == '&'
231	&& CvCLONE(ppad[ix]))
232	{
233	CV *kid = cv_clone((CV*)ppad[ix]);
234	SvREFCNT_dec(ppad[ix]);
235	CvCLONE_on(kid);
236	SvPADMY_on(kid);
237	npad[ix] = (SV*)kid;
238	}
239	}
240	#endif
241		192
242	return newpadlist;	193	return newpadlist;
243	}	194	}
244		195
245	STATIC void	196	static void
246	free_padlist (pTHX_ AV *padlist)	197	free_padlist (AV *padlist)
247	{	198	{
248	/* may be during global destruction */	199	/* may be during global destruction */
249	if (SvREFCNT (padlist))	200	if (SvREFCNT (padlist))
250	{	201	{
251	I32 i = AvFILLp (padlist);	202	I32 i = AvFILLp (padlist);
…		…
264		215
265	SvREFCNT_dec ((SV*)padlist);	216	SvREFCNT_dec ((SV*)padlist);
266	}	217	}
267	}	218	}
268		219
269	STATIC int	220	static int
270	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)	221	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
271	{	222	{
272	AV *padlist;	223	AV *padlist;
273	AV *av = (AV *)mg->mg_obj;	224	AV *av = (AV *)mg->mg_obj;
274		225
275	/* casting is fun. */	226	/* casting is fun. */
276	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	227	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
277	free_padlist (aTHX_ padlist);	228	free_padlist (padlist);
278		229
279	SvREFCNT_dec (av);	230	SvREFCNT_dec (av);
		231
		232	return 0;
280	}	233	}
281		234
282	#define PERL_MAGIC_coro PERL_MAGIC_ext	235	#define PERL_MAGIC_coro PERL_MAGIC_ext
283		236
284	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	237	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
285		238
		239	#define CORO_MAGIC(cv) \
		240	SvMAGIC (cv) \
		241	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		242	? SvMAGIC (cv) \
		243	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		244	: 0
		245
286	/* the next two functions merely cache the padlists */	246	/* the next two functions merely cache the padlists */
287	STATIC void	247	static void
288	get_padlist (pTHX_ CV *cv)	248	get_padlist (CV *cv)
289	{	249	{
290	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	250	MAGIC *mg = CORO_MAGIC (cv);
		251	AV *av;
291		252
292	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	253	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
293	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	254	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
294	else	255	else
		256	{
		257	#if 0
		258	/* this is probably cleaner, but also slower? */
		259	CV *cp = Perl_cv_clone (cv);
		260	CvPADLIST (cv) = CvPADLIST (cp);
		261	CvPADLIST (cp) = 0;
		262	SvREFCNT_dec (cp);
		263	#else
295	CvPADLIST (cv) = clone_padlist (aTHX_ CvPADLIST (cv));	264	CvPADLIST (cv) = coro_clone_padlist (cv);
		265	#endif
		266	}
296	}	267	}
297		268
298	STATIC void	269	static void
299	put_padlist (pTHX_ CV *cv)	270	put_padlist (CV *cv)
300	{	271	{
301	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	272	MAGIC *mg = CORO_MAGIC (cv);
		273	AV *av;
302		274
303	if (!mg)	275	if (!mg)
304	{	276	{
305	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	277	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
306	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	278	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
307	mg->mg_virtual = &vtbl_coro;	279	mg->mg_virtual = &vtbl_coro;
308	mg->mg_obj = (SV *)newAV ();	280	mg->mg_obj = (SV *)newAV ();
309	}	281	}
310		282
311	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	283	av = (AV *)mg->mg_obj;
		284
		285	if (AvFILLp (av) >= AvMAX (av))
		286	av_extend (av, AvMAX (av) + 1);
		287
		288	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
312	}	289	}
313		290
314	#define SB do {	291	#define SB do {
315	#define SE } while (0)	292	#define SE } while (0)
316		293
317	#define LOAD(state) load_state(aTHX_ (state));
318	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
319
320	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	294	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
321		295
322	static void	296	static void
323	load_state(pTHX_ Coro__State c)	297	load_perl (Coro__State c)
324	{	298	{
325	PL_dowarn = c->dowarn;	299	#define VAR(name,type) PL_ ## name = c->name;
326	PL_in_eval = c->in_eval;	300	# include "state.h"
327		301	#undef VAR
328	PL_curstackinfo = c->curstackinfo;
329	PL_curstack = c->curstack;
330	PL_mainstack = c->mainstack;
331	PL_stack_sp = c->stack_sp;
332	PL_op = c->op;
333	PL_curpad = c->curpad;
334	PL_comppad = c->comppad;
335	PL_compcv = c->compcv;
336	PL_stack_base = c->stack_base;
337	PL_stack_max = c->stack_max;
338	PL_tmps_stack = c->tmps_stack;
339	PL_tmps_floor = c->tmps_floor;
340	PL_tmps_ix = c->tmps_ix;
341	PL_tmps_max = c->tmps_max;
342	PL_markstack = c->markstack;
343	PL_markstack_ptr = c->markstack_ptr;
344	PL_markstack_max = c->markstack_max;
345	PL_scopestack = c->scopestack;
346	PL_scopestack_ix = c->scopestack_ix;
347	PL_scopestack_max = c->scopestack_max;
348	PL_savestack = c->savestack;
349	PL_savestack_ix = c->savestack_ix;
350	PL_savestack_max = c->savestack_max;
351	#ifdef PL_retstack
352	PL_retstack = c->retstack;
353	PL_retstack_ix = c->retstack_ix;
354	PL_retstack_max = c->retstack_max;
355	#endif
356	PL_curpm = c->curpm;
357	PL_curcop = c->curcop;
358	PL_top_env = c->top_env;
359		302
360	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	303	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
361	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	304	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
362	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	305	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		306	if (c->irssv) REPLACE_SV (PL_rs , c->irssv);
363		307
364	{	308	{
365	dSP;	309	dSP;
366	CV *cv;	310	CV *cv;
367		311
368	/* now do the ugly restore mess */	312	/* now do the ugly restore mess */
369	while ((cv = (CV *)POPs))	313	while ((cv = (CV *)POPs))
370	{	314	{
371	AV *padlist = (AV *)POPs;
372
373	if (padlist)
374	{
375	put_padlist (aTHX_ cv); /* mark this padlist as available */	315	put_padlist (cv); /* mark this padlist as available */
376	CvPADLIST(cv) = padlist;	316	CvDEPTH (cv) = PTR2IV (POPs);
377	}	317	CvPADLIST (cv) = (AV *)POPs;
378
379	++CvDEPTH(cv);
380	}	318	}
381		319
382	PUTBACK;	320	PUTBACK;
383	}	321	}
384	}	322	}
385		323
386	static void	324	static void
387	save_state(pTHX_ Coro__State c, int flags)	325	save_perl (Coro__State c)
388	{	326	{
389	{	327	{
390	dSP;	328	dSP;
391	I32 cxix = cxstack_ix;	329	I32 cxix = cxstack_ix;
392	PERL_CONTEXT *ccstk = cxstack;	330	PERL_CONTEXT *ccstk = cxstack;
…		…
403	{	341	{
404	while (cxix >= 0)	342	while (cxix >= 0)
405	{	343	{
406	PERL_CONTEXT *cx = &ccstk[cxix--];	344	PERL_CONTEXT *cx = &ccstk[cxix--];
407		345
408	if (CxTYPE(cx) == CXt_SUB)	346	if (CxTYPE (cx) == CXt_SUB)
409	{	347	{
410	CV *cv = cx->blk_sub.cv;	348	CV *cv = cx->blk_sub.cv;
		349
411	if (CvDEPTH(cv))	350	if (CvDEPTH (cv))
412	{	351	{
413	EXTEND (SP, CvDEPTH(cv)*2);	352	EXTEND (SP, 3);
414		353
415	while (--CvDEPTH(cv))
416	{
417	/* this tells the restore code to increment CvDEPTH */
418	PUSHs (Nullsv);
419	PUSHs ((SV *)cv);
420	}
421
422	PUSHs ((SV *)CvPADLIST(cv));	354	PUSHs ((SV *)CvPADLIST (cv));
		355	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
423	PUSHs ((SV *)cv);	356	PUSHs ((SV *)cv);
424		357
425	get_padlist (aTHX_ cv); /* this is a monster */	358	CvDEPTH (cv) = 0;
		359	get_padlist (cv);
426	}	360	}
427	}	361	}
428	#ifdef CXt_FORMAT	362	#ifdef CXt_FORMAT
429	else if (CxTYPE(cx) == CXt_FORMAT)	363	else if (CxTYPE (cx) == CXt_FORMAT)
430	{	364	{
431	/* I never used formats, so how should I know how these are implemented? */	365	/* I never used formats, so how should I know how these are implemented? */
432	/* my bold guess is as a simple, plain sub... */	366	/* my bold guess is as a simple, plain sub... */
433	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	367	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
434	}	368	}
…		…
444	}	378	}
445		379
446	PUTBACK;	380	PUTBACK;
447	}	381	}
448		382
449	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	383	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
450	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	384	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
451	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	385	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		386	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
452		387
453	c->dowarn = PL_dowarn;	388	#define VAR(name,type)c->name = PL_ ## name;
454	c->in_eval = PL_in_eval;	389	# include "state.h"
455		390	#undef VAR
456	c->curstackinfo = PL_curstackinfo;
457	c->curstack = PL_curstack;
458	c->mainstack = PL_mainstack;
459	c->stack_sp = PL_stack_sp;
460	c->op = PL_op;
461	c->curpad = PL_curpad;
462	c->comppad = PL_comppad;
463	c->compcv = PL_compcv;
464	c->stack_base = PL_stack_base;
465	c->stack_max = PL_stack_max;
466	c->tmps_stack = PL_tmps_stack;
467	c->tmps_floor = PL_tmps_floor;
468	c->tmps_ix = PL_tmps_ix;
469	c->tmps_max = PL_tmps_max;
470	c->markstack = PL_markstack;
471	c->markstack_ptr = PL_markstack_ptr;
472	c->markstack_max = PL_markstack_max;
473	c->scopestack = PL_scopestack;
474	c->scopestack_ix = PL_scopestack_ix;
475	c->scopestack_max = PL_scopestack_max;
476	c->savestack = PL_savestack;
477	c->savestack_ix = PL_savestack_ix;
478	c->savestack_max = PL_savestack_max;
479	#ifdef PL_retstack
480	c->retstack = PL_retstack;
481	c->retstack_ix = PL_retstack_ix;
482	c->retstack_max = PL_retstack_max;
483	#endif
484	c->curpm = PL_curpm;
485	c->curcop = PL_curcop;
486	c->top_env = PL_top_env;
487	}	391	}
488		392
489	/*	393	/*
490	* allocate various perl stacks. This is an exact copy	394	* allocate various perl stacks. This is an exact copy
491	* of perl.c:init_stacks, except that it uses less memory	395	* of perl.c:init_stacks, except that it uses less memory
492	* on the (sometimes correct) assumption that coroutines do	396	* on the (sometimes correct) assumption that coroutines do
493	* not usually need a lot of stackspace.	397	* not usually need a lot of stackspace.
494	*/	398	*/
495	STATIC void	399	static void
496	coro_init_stacks (pTHX)	400	coro_init_stacks ()
497	{	401	{
498	LOCK;
499
500	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	402	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
501	PL_curstackinfo->si_type = PERLSI_MAIN;	403	PL_curstackinfo->si_type = PERLSI_MAIN;
502	PL_curstack = PL_curstackinfo->si_stack;	404	PL_curstack = PL_curstackinfo->si_stack;
503	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	405	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
504		406
505	PL_stack_base = AvARRAY(PL_curstack);	407	PL_stack_base = AvARRAY(PL_curstack);
506	PL_stack_sp = PL_stack_base;	408	PL_stack_sp = PL_stack_base;
507	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	409	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
508		410
509	New(50,PL_tmps_stack,96,SV*);	411	New(50,PL_tmps_stack,128,SV*);
510	PL_tmps_floor = -1;	412	PL_tmps_floor = -1;
511	PL_tmps_ix = -1;	413	PL_tmps_ix = -1;
512	PL_tmps_max = 96;	414	PL_tmps_max = 128;
513		415
514	New(54,PL_markstack,16,I32);	416	New(54,PL_markstack,32,I32);
515	PL_markstack_ptr = PL_markstack;	417	PL_markstack_ptr = PL_markstack;
516	PL_markstack_max = PL_markstack + 16;	418	PL_markstack_max = PL_markstack + 32;
517		419
518	#ifdef SET_MARK_OFFSET	420	#ifdef SET_MARK_OFFSET
519	SET_MARK_OFFSET;	421	SET_MARK_OFFSET;
520	#endif	422	#endif
521		423
522	New(54,PL_scopestack,16,I32);	424	New(54,PL_scopestack,32,I32);
523	PL_scopestack_ix = 0;	425	PL_scopestack_ix = 0;
524	PL_scopestack_max = 16;	426	PL_scopestack_max = 32;
525		427
526	New(54,PL_savestack,96,ANY);	428	New(54,PL_savestack,64,ANY);
527	PL_savestack_ix = 0;	429	PL_savestack_ix = 0;
528	PL_savestack_max = 96;	430	PL_savestack_max = 64;
529		431
530	#ifdef PL_retstack	432	#if !PERL_VERSION_ATLEAST (5,9,0)
531	New(54,PL_retstack,8,OP*);	433	New(54,PL_retstack,16,OP*);
532	PL_retstack_ix = 0;	434	PL_retstack_ix = 0;
533	PL_retstack_max = 8;	435	PL_retstack_max = 16;
534	#endif	436	#endif
535
536	UNLOCK;
537	}	437	}
538		438
539	/*	439	/*
540	* destroy the stacks, the callchain etc...	440	* destroy the stacks, the callchain etc...
541	*/	441	*/
542	STATIC void	442	static void
543	destroy_stacks(pTHX)	443	coro_destroy_stacks ()
544	{	444	{
545	if (!IN_DESTRUCT)	445	if (!IN_DESTRUCT)
546	{	446	{
547	/* is this ugly, I ask? */	447	/* is this ugly, I ask? */
548	LEAVE_SCOPE (0);	448	LEAVE_SCOPE (0);
…		…
579		479
580	Safefree (PL_tmps_stack);	480	Safefree (PL_tmps_stack);
581	Safefree (PL_markstack);	481	Safefree (PL_markstack);
582	Safefree (PL_scopestack);	482	Safefree (PL_scopestack);
583	Safefree (PL_savestack);	483	Safefree (PL_savestack);
584	#ifdef PL_retstack	484	#if !PERL_VERSION_ATLEAST (5,9,0)
585	Safefree (PL_retstack);	485	Safefree (PL_retstack);
586	#endif	486	#endif
587	}	487	}
588		488
589	static void	489	static void
590	allocate_stack (Coro__State ctx, int alloc)	490	setup_coro (struct coro *coro)
591	{
592	coro_stack *stack;
593
594	New (0, stack, 1, coro_stack);
595
596	stack->refcnt = 1;
597	stack->usecnt = 1;
598	stack->gencnt = ctx->gencnt = 0;
599
600	if (alloc)
601	{
602	#if HAVE_MMAP
603	stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */
604	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
605	if (stack->sptr == (void *)-1)
606	#endif
607	{
608	/*FIXME*//*D*//* reasonable stack size! */
609	stack->ssize = - (STACKSIZE * sizeof (long));
610	New (0, stack->sptr, STACKSIZE, long);
611	}
612	}
613	else
614	stack->sptr = 0;
615
616	ctx->stack = stack;
617	}
618
619	static void
620	deallocate_stack (Coro__State ctx)
621	{
622	coro_stack *stack = ctx->stack;
623
624	ctx->stack = 0;
625
626	if (stack)
627	{
628	if (!--stack->refcnt)
629	{
630	#ifdef HAVE_MMAP
631	if (stack->ssize > 0 && stack->sptr)
632	munmap (stack->sptr, stack->ssize);
633	else
634	#endif
635	Safefree (stack->sptr);
636
637	Safefree (stack);
638	}
639	else if (ctx->gencnt == stack->gencnt)
640	--stack->usecnt;
641	}
642	}
643
644	static void
645	setup_coro (void *arg)
646	{	491	{
647	/*	492	/*
648	* emulate part of the perl startup here.	493	* emulate part of the perl startup here.
649	*/	494	*/
650	dTHX;
651	dSP;
652	Coro__State ctx = (Coro__State)arg;
653	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
654		495
655	coro_init_stacks (aTHX);	496	coro_init_stacks ();
656	/*PL_curcop = 0;*/	497
657	/*PL_in_eval = PL_in_eval;*/ /* inherit */	498	PL_curcop = &PL_compiling;
		499	PL_in_eval = EVAL_NULL;
		500	PL_curpm = 0;
		501	PL_localizing = 0;
		502	PL_dirty = 0;
		503	PL_restartop = 0;
		504
		505	{
		506	dSP;
		507	LOGOP myop;
		508
658	SvREFCNT_dec (GvAV (PL_defgv));	509	SvREFCNT_dec (GvAV (PL_defgv));
659	GvAV (PL_defgv) = ctx->args; ctx->args = 0;	510	GvAV (PL_defgv) = coro->args; coro->args = 0;
660		511
661	SPAGAIN;
662
663	if (ctx->stack)
664	{
665	ctx->cursp = 0;
666
667	PUSHMARK(SP);
668	PUTBACK;
669	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
670
671	if (SvTRUE (ERRSV))
672	croak (NULL);
673	else
674	croak ("FATAL: CCTXT coroutine returned!");
675	}
676	else
677	{
678	UNOP myop;
679
680	PL_op = (OP *)&myop;
681
682	Zero(&myop, 1, UNOP);	512	Zero (&myop, 1, LOGOP);
683	myop.op_next = Nullop;	513	myop.op_next = Nullop;
684	myop.op_flags = OPf_WANT_VOID;	514	myop.op_flags = OPf_WANT_VOID;
685		515
686	PUSHMARK(SP);	516	PUSHMARK (SP);
687	XPUSHs (sub_init);	517	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
688	/*
689	* the next line is slightly wrong, as PL_op->op_next
690	* is actually being executed so we skip the first op.
691	* that doesn't matter, though, since it is only
692	* pp_nextstate and we never return...
693	* ah yes, and I don't care anyways ;)
694	*/
695	PUTBACK;	518	PUTBACK;
		519	PL_op = (OP *)&myop;
696	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	520	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
697	SPAGAIN;	521	SPAGAIN;
		522	}
698		523
699	ENTER; /* necessary e.g. for dounwind */	524	ENTER; /* necessary e.g. for dounwind */
700	}
701	}	525	}
702		526
703	static void	527	static void
704	continue_coro (void *arg)	528	free_coro_mortal ()
705	{	529	{
706	/*
707	* this is a _very_ stripped down perl interpreter ;)
708	*/
709	dTHX;
710	Coro__State ctx = (Coro__State)arg;
711	JMPENV coro_start_env;
712
713	PL_top_env = &ctx->start_env;
714
715	ctx->cursp = 0;
716	PL_op = PL_op->op_next;
717	CALLRUNOPS(aTHX);
718
719	abort ();
720	}
721
722	STATIC void
723	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)
724	{
725	dSTACKLEVEL;
726
727	if (prev != next)
728	{
729	if (next->mainstack)
730	{
731	LOCK;
732	SAVE (prev, flags);
733	LOAD (next);
734	UNLOCK;
735
736	/* mark this state as in-use */
737	next->mainstack = 0;
738	next->tmps_ix = -2;
739
740	/* stacklevel changed? if yes, grab the stack for us! */
741	if (flags & TRANSFER_SAVE_CCTXT)
742	{
743	if (!prev->stack)
744	allocate_stack (prev, 0);
745	else if (prev->cursp != stacklevel
746	&& prev->stack->usecnt > 1)
747	{
748	prev->gencnt = ++prev->stack->gencnt;
749	prev->stack->usecnt = 1;
750	}
751
752	/* has our stack been invalidated? */
753	if (next->stack && next->stack->gencnt != next->gencnt)
754	{
755	deallocate_stack (next);
756	allocate_stack (next, 1);
757	coro_create (&(next->stack->cctx),
758	continue_coro, (void *)next,
759	next->stack->sptr, labs (next->stack->ssize));
760	}
761
762	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
763	prev->cursp = stacklevel;
764	/* don't add any code here */
765	}
766	else
767	next->cursp = stacklevel;
768	}
769	else if (next->tmps_ix == -2)
770	croak ("tried to transfer to running coroutine");
771	else
772	{
773	LOCK;
774	SAVE (prev, -1); /* first get rid of the old state */
775	UNLOCK;
776
777	if (flags & TRANSFER_SAVE_CCTXT)
778	{
779	if (!prev->stack)
780	allocate_stack (prev, 0);
781
782	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
783	{
784	PL_top_env = &next->start_env;
785
786	setup_coro (next);
787	next->cursp = stacklevel;
788
789	prev->stack->refcnt++;
790	prev->stack->usecnt++;
791	next->stack = prev->stack;
792	next->gencnt = prev->gencnt;
793	}
794	else
795	{
796	assert (!next->stack);
797	allocate_stack (next, 1);
798	coro_create (&(next->stack->cctx),
799	setup_coro, (void *)next,
800	next->stack->sptr, labs (next->stack->ssize));
801	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
802	prev->cursp = stacklevel;
803	/* don't add any code here */
804	}
805	}
806	else
807	{
808	setup_coro (next);
809	next->cursp = stacklevel;
810	}
811	}
812	}
813
814	LOCK;
815	if (coro_mortal)	530	if (coro_mortal)
816	{	531	{
817	SvREFCNT_dec (coro_mortal);	532	SvREFCNT_dec (coro_mortal);
818	coro_mortal = 0;	533	coro_mortal = 0;
819	}	534	}
		535	}
		536
		537	/* inject a fake call to Coro::State::_cctx_init into the execution */
		538	static void NOINLINE
		539	prepare_cctx (coro_cctx *cctx)
		540	{
		541	dSP;
		542	LOGOP myop;
		543
		544	Zero (&myop, 1, LOGOP);
		545	myop.op_next = PL_op;
		546	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		547
		548	PUSHMARK (SP);
		549	EXTEND (SP, 2);
		550	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		551	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		552	PUTBACK;
		553	PL_op = (OP *)&myop;
		554	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		555	SPAGAIN;
		556	}
		557
		558	static void
		559	coro_run (void *arg)
		560	{
		561	/* coro_run is the alternative tail of transfer(), so unlock here. */
820	UNLOCK;	562	UNLOCK;
821	}
822		563
823	#define SV_CORO(sv,func) \	564	/*
824	do { \	565	* this is a _very_ stripped down perl interpreter ;)
825	if (SvROK (sv)) \	566	*/
826	sv = SvRV (sv); \	567	PL_top_env = &PL_start_env;
827	\
828	if (SvTYPE (sv) == SVt_PVHV) \
829	{ \
830	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
831	\
832	if (!he) \
833	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
834	\
835	(sv) = SvRV (HeVAL(he)); \
836	} \
837	\
838	/* must also be changed inside Coro::Cont::yield */ \
839	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
840	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
841	\
842	} while(0)
843		568
844	#define SvSTATE(sv) (struct coro *)SvIV (sv)	569	/* inject call to cctx_init */
		570	prepare_cctx ((coro_cctx *)arg);
845		571
		572	/* somebody will hit me for both perl_run and PL_restartop */
		573	PL_restartop = PL_op;
		574	perl_run (PL_curinterp);
		575
		576	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		577	abort ();
		578	}
		579
		580	static coro_cctx *
		581	cctx_new ()
		582	{
		583	coro_cctx *cctx;
		584
		585	++cctx_count;
		586
		587	New (0, cctx, 1, coro_cctx);
		588
		589	#if HAVE_MMAP
		590
		591	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		592	/* mmap supposedly does allocate-on-write for us */
		593	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		594
		595	if (cctx->sptr == (void *)-1)
		596	{
		597	perror ("FATAL: unable to mmap stack for coroutine");
		598	_exit (EXIT_FAILURE);
		599	}
		600
		601	# if STACKGUARD
		602	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		603	# endif
		604
		605	#else
		606
		607	cctx->ssize = STACKSIZE * (long)sizeof (long);
		608	New (0, cctx->sptr, STACKSIZE, long);
		609
		610	if (!cctx->sptr)
		611	{
		612	perror ("FATAL: unable to malloc stack for coroutine");
		613	_exit (EXIT_FAILURE);
		614	}
		615
		616	#endif
		617
		618	#if USE_VALGRIND
		619	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		620	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		621	cctx->ssize + (char *)cctx->sptr
		622	);
		623	#endif
		624
		625	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		626
		627	return cctx;
		628	}
		629
		630	static void
		631	cctx_destroy (coro_cctx *cctx)
		632	{
		633	if (!cctx)
		634	return;
		635
		636	--cctx_count;
		637
		638	#if USE_VALGRIND
		639	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		640	#endif
		641
		642	#if HAVE_MMAP
		643	munmap (cctx->sptr, cctx->ssize);
		644	#else
		645	Safefree (cctx->sptr);
		646	#endif
		647
		648	Safefree (cctx);
		649	}
		650
		651	static coro_cctx *
		652	cctx_get ()
		653	{
		654	coro_cctx *cctx;
		655
		656	if (cctx_first)
		657	{
		658	cctx = cctx_first;
		659	cctx_first = cctx->next;
		660	--cctx_idle;
		661	}
		662	else
		663	{
		664	cctx = cctx_new ();
		665	PL_op = PL_op->op_next;
		666	}
		667
		668	return cctx;
		669	}
		670
		671	static void
		672	cctx_put (coro_cctx *cctx)
		673	{
		674	/* free another cctx if overlimit */
		675	if (cctx_idle >= MAX_IDLE_CCTX)
		676	{
		677	coro_cctx *first = cctx_first;
		678	cctx_first = first->next;
		679	--cctx_idle;
		680
		681	assert (!first->inuse);
		682	cctx_destroy (first);
		683	}
		684
		685	++cctx_idle;
		686	cctx->next = cctx_first;
		687	cctx_first = cctx;
		688	}
		689
		690	/* never call directly, always through the coro_state_transfer global variable */
		691	static void NOINLINE
		692	transfer (struct coro *prev, struct coro *next)
		693	{
		694	dSTACKLEVEL;
		695
		696	/* sometimes transfer is only called to set idle_sp */
		697	if (!next)
		698	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		699	else if (prev != next)
		700	{
		701	coro_cctx *prev__cctx;
		702
		703	if (prev->flags & CF_NEW)
		704	{
		705	/* create a new empty context */
		706	Newz (0, prev->cctx, 1, coro_cctx);
		707	prev->cctx->inuse = 1;
		708	prev->flags &= ~CF_NEW;
		709	prev->flags |= CF_RUNNING;
		710	}
		711
		712	/*TODO: must not croak here */
		713	if (!prev->flags & CF_RUNNING)
		714	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		715
		716	if (next->flags & CF_RUNNING)
		717	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		718
		719	prev->flags &= ~CF_RUNNING;
		720	next->flags |= CF_RUNNING;
		721
		722	LOCK;
		723
		724	if (next->flags & CF_NEW)
		725	{
		726	/* need to start coroutine */
		727	next->flags &= ~CF_NEW;
		728	/* first get rid of the old state */
		729	save_perl (prev);
		730	/* setup coroutine call */
		731	setup_coro (next);
		732	/* need a new stack */
		733	assert (!next->stack);
		734	}
		735	else
		736	{
		737	/* coroutine already started */
		738	save_perl (prev);
		739	load_perl (next);
		740	}
		741
		742	prev__cctx = prev->cctx;
		743
		744	/* possibly "free" the cctx */
		745	if (prev__cctx->idle_sp == STACKLEVEL)
		746	{
		747	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		748	assert (PL_top_env == prev__cctx->top_env);
		749
		750	prev->cctx = 0;
		751
		752	cctx_put (prev__cctx);
		753	prev__cctx->inuse = 0;
		754	}
		755
		756	if (!next->cctx)
		757	{
		758	next->cctx = cctx_get ();
		759	assert (!next->cctx->inuse);
		760	next->cctx->inuse = 1;
		761	}
		762
		763	if (prev__cctx != next->cctx)
		764	{
		765	prev__cctx->top_env = PL_top_env;
		766	PL_top_env = next->cctx->top_env;
		767	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		768	}
		769
		770	free_coro_mortal ();
		771
		772	UNLOCK;
		773	}
		774	}
		775
		776	struct transfer_args
		777	{
		778	struct coro *prev, *next;
		779	};
		780
		781	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		782
		783	static void
		784	coro_state_destroy (struct coro *coro)
		785	{
		786	if (coro->refcnt--)
		787	return;
		788
		789	if (coro->mainstack && coro->mainstack != main_mainstack)
		790	{
		791	struct coro temp;
		792	Zero (&temp, 1, struct coro);
		793	temp.save = CORO_SAVE_ALL;
		794
		795	if (coro->flags & CF_RUNNING)
		796	croak ("FATAL: tried to destroy currently running coroutine");
		797
		798	save_perl (&temp);
		799	load_perl (coro);
		800
		801	coro_destroy_stacks ();
		802
		803	load_perl (&temp); /* this will get rid of defsv etc.. */
		804
		805	coro->mainstack = 0;
		806	}
		807
		808	cctx_destroy (coro->cctx);
		809	SvREFCNT_dec (coro->args);
		810	Safefree (coro);
		811	}
		812
846	static void	813	static int
		814	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		815	{
		816	struct coro *coro = (struct coro *)mg->mg_ptr;
		817	mg->mg_ptr = 0;
		818
		819	coro_state_destroy (coro);
		820
		821	return 0;
		822	}
		823
		824	static int
		825	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		826	{
		827	struct coro *coro = (struct coro *)mg->mg_ptr;
		828
		829	++coro->refcnt;
		830
		831	return 0;
		832	}
		833
		834	static MGVTBL coro_state_vtbl = {
		835	0, 0, 0, 0,
		836	coro_state_clear,
		837	0,
		838	#ifdef MGf_DUP
		839	coro_state_dup,
		840	#else
		841	# define MGf_DUP 0
		842	#endif
		843	};
		844
		845	static struct coro *
		846	SvSTATE (SV *coro)
		847	{
		848	HV *stash;
		849	MAGIC *mg;
		850
		851	if (SvROK (coro))
		852	coro = SvRV (coro);
		853
		854	stash = SvSTASH (coro);
		855	if (stash != coro_stash && stash != coro_state_stash)
		856	{
		857	/* very slow, but rare, check */
		858	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		859	croak ("Coro::State object required");
		860	}
		861
		862	mg = SvMAGIC (coro);
		863	assert (mg->mg_type == PERL_MAGIC_ext);
		864	return (struct coro *)mg->mg_ptr;
		865	}
		866
		867	static void
		868	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		869	{
		870	ta->prev = SvSTATE (prev_sv);
		871	ta->next = SvSTATE (next_sv);
		872	}
		873
		874	static void
847	api_transfer(pTHX_ SV *prev, SV *next, int flags)	875	api_transfer (SV *prev_sv, SV *next_sv)
848	{	876	{
849	SV_CORO (prev, "Coro::transfer");	877	struct transfer_args ta;
850	SV_CORO (next, "Coro::transfer");
851		878
852	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	879	prepare_transfer (&ta, prev_sv, next_sv);
		880	TRANSFER (ta);
		881	}
		882
		883	static int
		884	api_save (SV *coro_sv, int new_save)
		885	{
		886	struct coro *coro = SvSTATE (coro_sv);
		887	int old_save = coro->save;
		888
		889	if (new_save >= 0)
		890	coro->save = new_save;
		891
		892	return old_save;
853	}	893	}
854		894
855	/** Coro ********************************************************************/	895	/** Coro ********************************************************************/
856		896
857	#define PRIO_MAX 3	897	#define PRIO_MAX 3
…		…
860	#define PRIO_LOW -1	900	#define PRIO_LOW -1
861	#define PRIO_IDLE -3	901	#define PRIO_IDLE -3
862	#define PRIO_MIN -4	902	#define PRIO_MIN -4
863		903
864	/* for Coro.pm */	904	/* for Coro.pm */
865	static GV *coro_current, *coro_idle;	905	static SV *coro_current;
866	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	906	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
867	static int coro_nready;	907	static int coro_nready;
868		908
869	static void	909	static void
870	coro_enq (pTHX_ SV *sv)	910	coro_enq (SV *coro_sv)
871	{	911	{
872	if (SvTYPE (sv) == SVt_PVHV)
873	{
874	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
875	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
876
877	prio = prio > PRIO_MAX ? PRIO_MAX
878	: prio < PRIO_MIN ? PRIO_MIN
879	: prio;
880
881	av_push (coro_ready [prio - PRIO_MIN], sv);	912	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
882	coro_nready++;	913	coro_nready++;
883
884	return;
885	}
886
887	croak ("Coro::ready tried to enqueue something that is not a coroutine");
888	}	914	}
889		915
890	static SV *	916	static SV *
891	coro_deq (pTHX_ int min_prio)	917	coro_deq (int min_prio)
892	{	918	{
893	int prio = PRIO_MAX - PRIO_MIN;	919	int prio = PRIO_MAX - PRIO_MIN;
894		920
895	min_prio -= PRIO_MIN;	921	min_prio -= PRIO_MIN;
896	if (min_prio < 0)	922	if (min_prio < 0)
897	min_prio = 0;	923	min_prio = 0;
898		924
899	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	925	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
900	if (av_len (coro_ready[prio]) >= 0)	926	if (AvFILLp (coro_ready [prio]) >= 0)
901	{	927	{
902	coro_nready--;	928	coro_nready--;
903	return av_shift (coro_ready[prio]);	929	return av_shift (coro_ready [prio]);
904	}	930	}
905		931
906	return 0;	932	return 0;
907	}	933	}
908		934
909	static void	935	static int
910	api_ready (SV *coro)	936	api_ready (SV *coro_sv)
911	{	937	{
912	dTHX;	938	struct coro *coro;
913		939
914	if (SvROK (coro))	940	if (SvROK (coro_sv))
915	coro = SvRV (coro);	941	coro_sv = SvRV (coro_sv);
		942
		943	coro = SvSTATE (coro_sv);
		944
		945	if (coro->flags & CF_READY)
		946	return 0;
		947
		948	#if 0 /* this is actually harmless */
		949	if (coro->flags & CF_RUNNING)
		950	croak ("Coro::ready called on currently running coroutine");
		951	#endif
		952
		953	coro->flags |= CF_READY;
916		954
917	LOCK;	955	LOCK;
918	coro_enq (aTHX_ SvREFCNT_inc (coro));	956	coro_enq (SvREFCNT_inc (coro_sv));
919	UNLOCK;	957	UNLOCK;
		958
		959	return 1;
		960	}
		961
		962	static int
		963	api_is_ready (SV *coro_sv)
		964	{
		965	return !!SvSTATE (coro_sv)->flags & CF_READY;
		966	}
		967
		968	static void
		969	prepare_schedule (struct transfer_args *ta)
		970	{
		971	SV *prev, *next;
		972
		973	for (;;)
		974	{
		975	LOCK;
		976	next = coro_deq (PRIO_MIN);
		977	UNLOCK;
		978
		979	if (next)
		980	break;
		981
		982	{
		983	dSP;
		984
		985	ENTER;
		986	SAVETMPS;
		987
		988	PUSHMARK (SP);
		989	PUTBACK;
		990	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		991
		992	FREETMPS;
		993	LEAVE;
		994	}
		995	}
		996
		997	prev = SvRV (coro_current);
		998	SvRV_set (coro_current, next);
		999
		1000	/* free this only after the transfer */
		1001	LOCK;
		1002	free_coro_mortal ();
		1003	UNLOCK;
		1004	coro_mortal = prev;
		1005
		1006	assert (!SvROK(prev));//D
		1007	assert (!SvROK(next));//D
		1008
		1009	ta->prev = SvSTATE (prev);
		1010	ta->next = SvSTATE (next);
		1011
		1012	assert (ta->next->flags & CF_READY);
		1013	ta->next->flags &= ~CF_READY;
		1014	}
		1015
		1016	static void
		1017	prepare_cede (struct transfer_args *ta)
		1018	{
		1019	api_ready (coro_current);
		1020
		1021	prepare_schedule (ta);
920	}	1022	}
921		1023
922	static void	1024	static void
923	api_schedule (void)	1025	api_schedule (void)
924	{	1026	{
925	dTHX;	1027	struct transfer_args ta;
926		1028
927	SV *prev, *next;	1029	prepare_schedule (&ta);
928		1030	TRANSFER (ta);
929	LOCK;
930
931	prev = SvRV (GvSV (coro_current));
932	next = coro_deq (aTHX_ PRIO_MIN);
933
934	if (!next)
935	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
936
937	/* free this only after the transfer */
938	coro_mortal = prev;
939	SV_CORO (prev, "Coro::schedule");
940
941	SvRV (GvSV (coro_current)) = next;
942
943	SV_CORO (next, "Coro::schedule");
944
945	UNLOCK;
946
947	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
948	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
949	}	1031	}
950		1032
951	static void	1033	static void
952	api_cede (void)	1034	api_cede (void)
953	{	1035	{
954	dTHX;	1036	struct transfer_args ta;
955		1037
956	LOCK;	1038	prepare_cede (&ta);
957	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1039	TRANSFER (ta);
958	UNLOCK;
959
960	api_schedule ();
961	}	1040	}
962		1041
963	MODULE = Coro::State PACKAGE = Coro::State	1042	MODULE = Coro::State PACKAGE = Coro::State
964		1043
965	PROTOTYPES: ENABLE	1044	PROTOTYPES: DISABLE
966		1045
967	BOOT:	1046	BOOT:
968	{ /* {} necessary for stoopid perl-5.6.x */	1047	{
969	#ifdef USE_ITHREADS	1048	#ifdef USE_ITHREADS
970	MUTEX_INIT (&coro_mutex);	1049	MUTEX_INIT (&coro_mutex);
971	#endif	1050	#endif
		1051	BOOT_PAGESIZE;
972		1052
973	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
974	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
975	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1053	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
976		1054
977	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1055	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
978	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1056	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
979	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1057	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1058	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
980	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1059	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
981		1060
982	main_mainstack = PL_mainstack;	1061	main_mainstack = PL_mainstack;
983		1062
984	coroapi.ver = CORO_API_VERSION;	1063	coroapi.ver = CORO_API_VERSION;
985	coroapi.transfer = api_transfer;	1064	coroapi.transfer = api_transfer;
986	}
987		1065
988	Coro::State	1066	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
989	_newprocess(args)	1067	}
990	SV * args	1068
991	PROTOTYPE: $	1069	SV *
		1070	new (char *klass, ...)
992	CODE:	1071	CODE:
993	Coro__State coro;	1072	{
		1073	struct coro *coro;
		1074	HV *hv;
		1075	int i;
994		1076
995	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
996	croak ("Coro::State::_newprocess expects an arrayref");
997
998	Newz (0, coro, 1, struct coro);	1077	Newz (0, coro, 1, struct coro);
		1078	coro->args = newAV ();
		1079	coro->save = CORO_SAVE_ALL;
		1080	coro->flags = CF_NEW;
999		1081
1000	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1082	hv = newHV ();
1001	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1083	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1002	/*coro->stack = 0;*/	1084	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1003		1085
1004	/* same as JMPENV_BOOTSTRAP */	1086	for (i = 1; i < items; i++)
1005	/* we might be able to recycle start_env, but safe is safe */	1087	av_push (coro->args, newSVsv (ST (i)));
1006	/*Zero(&coro->start_env, 1, JMPENV);*/	1088	}
1007	coro->start_env.je_ret = -1;
1008	coro->start_env.je_mustcatch = TRUE;
1009
1010	RETVAL = coro;
1011	OUTPUT:	1089	OUTPUT:
1012	RETVAL	1090	RETVAL
1013		1091
		1092	int
		1093	save (SV *coro, int new_save = -1)
		1094	CODE:
		1095	RETVAL = api_save (coro, new_save);
		1096	OUTPUT:
		1097	RETVAL
		1098
1014	void	1099	void
1015	transfer(prev, next, flags)	1100	_set_stacklevel (...)
1016	SV *prev	1101	ALIAS:
1017	SV *next	1102	Coro::State::transfer = 1
1018	int flags	1103	Coro::schedule = 2
1019	PROTOTYPE: @	1104	Coro::cede = 3
1020	CODE:	1105	CODE:
1021	PUTBACK;	1106	{
1022	SV_CORO (next, "Coro::transfer");	1107	struct transfer_args ta;
1023	SV_CORO (prev, "Coro::transfer");	1108
1024	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1109	switch (ix)
1025	SPAGAIN;	1110	{
		1111	case 0:
		1112	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1113	ta.next = 0;
		1114	break;
		1115
		1116	case 1:
		1117	if (items != 2)
		1118	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1119
		1120	prepare_transfer (&ta, ST (0), ST (1));
		1121	break;
		1122
		1123	case 2:
		1124	prepare_schedule (&ta);
		1125	break;
		1126
		1127	case 3:
		1128	prepare_cede (&ta);
		1129	break;
		1130	}
		1131
		1132	TRANSFER (ta);
		1133	}
1026		1134
1027	void	1135	void
1028	DESTROY(coro)	1136	_clone_state_from (SV *dst, SV *src)
1029	Coro::State coro	1137	CODE:
1030	CODE:	1138	{
		1139	struct coro *coro_src = SvSTATE (src);
1031		1140
1032	if (coro->mainstack && coro->mainstack != main_mainstack)	1141	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1033	{
1034	struct coro temp;
1035		1142
1036	PUTBACK;	1143	++coro_src->refcnt;
1037	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1144	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1038	LOAD (aTHX_ coro);	1145	}
1039	SPAGAIN;
1040
1041	destroy_stacks (aTHX);
1042
1043	LOAD ((&temp)); /* this will get rid of defsv etc.. */
1044	SPAGAIN;
1045
1046	coro->mainstack = 0;
1047	}
1048
1049	deallocate_stack (coro);
1050	SvREFCNT_dec (coro->args);
1051	Safefree (coro);
1052		1146
1053	void	1147	void
1054	_exit(code)	1148	_exit (code)
1055	int code	1149	int code
1056	PROTOTYPE: $	1150	PROTOTYPE: $
1057	CODE:	1151	CODE:
1058	_exit (code);	1152	_exit (code);
1059		1153
1060	MODULE = Coro::State PACKAGE = Coro::Cont	1154	int
		1155	cctx_count ()
		1156	CODE:
		1157	RETVAL = cctx_count;
		1158	OUTPUT:
		1159	RETVAL
1061		1160
1062	# this is slightly dirty (should expose a c-level api)	1161	int
1063		1162	cctx_idle ()
1064	void	1163	CODE:
1065	yield(...)	1164	RETVAL = cctx_idle;
1066	PROTOTYPE: @	1165	OUTPUT:
1067	CODE:	1166	RETVAL
1068	SV *yieldstack;
1069	SV *sv;
1070	AV *defav = GvAV (PL_defgv);
1071	struct coro *prev, *next;
1072
1073	yieldstack = *hv_fetch (
1074	(HV *)SvRV (GvSV (coro_current)),
1075	"yieldstack", sizeof ("yieldstack") - 1,
1076	0
1077	);
1078
1079	/* set up @_ -- ugly */
1080	av_clear (defav);
1081	av_fill (defav, items - 1);
1082	while (items--)
1083	av_store (defav, items, SvREFCNT_inc (ST(items)));
1084
1085	sv = av_pop ((AV *)SvRV (yieldstack));
1086	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1087	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1088	SvREFCNT_dec (sv);
1089
1090	transfer (aTHX_ prev, next, 0);
1091		1167
1092	MODULE = Coro::State PACKAGE = Coro	1168	MODULE = Coro::State PACKAGE = Coro
1093		1169
1094	# this is slightly dirty (should expose a c-level api)
1095
1096	BOOT:	1170	BOOT:
1097	{	1171	{
1098	int i;	1172	int i;
		1173
1099	HV *stash = gv_stashpv ("Coro", TRUE);	1174	coro_stash = gv_stashpv ("Coro", TRUE);
1100		1175
1101	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1176	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1102	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1177	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1103	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1178	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1104	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1179	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1105	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1180	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1106	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1181	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1107		1182
1108	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1183	coro_current = get_sv ("Coro::current", FALSE);
1109	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1184	SvREADONLY_on (coro_current);
1110		1185
1111	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1186	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1112	coro_ready[i] = newAV ();	1187	coro_ready[i] = newAV ();
1113		1188
1114	{	1189	{
1115	SV *sv = perl_get_sv("Coro::API", 1);	1190	SV *sv = perl_get_sv("Coro::API", 1);
1116		1191
1117	coroapi.schedule = api_schedule;	1192	coroapi.schedule = api_schedule;
		1193	coroapi.save = api_save;
1118	coroapi.cede = api_cede;	1194	coroapi.cede = api_cede;
1119	coroapi.ready = api_ready;	1195	coroapi.ready = api_ready;
		1196	coroapi.is_ready = api_is_ready;
1120	coroapi.nready = &coro_nready;	1197	coroapi.nready = &coro_nready;
1121	coroapi.current = coro_current;	1198	coroapi.current = coro_current;
1122		1199
1123	GCoroAPI = &coroapi;	1200	GCoroAPI = &coroapi;
1124	sv_setiv(sv, (IV)&coroapi);	1201	sv_setiv (sv, (IV)&coroapi);
1125	SvREADONLY_on(sv);	1202	SvREADONLY_on (sv);
1126	}	1203	}
1127	}	1204	}
1128		1205
1129	#if !PERL_MICRO
1130
1131	void	1206	void
1132	ready(self)	1207	_set_current (SV *current)
1133	SV * self
1134	PROTOTYPE: $	1208	PROTOTYPE: $
1135	CODE:	1209	CODE:
1136	api_ready (self);	1210	SvREFCNT_dec (SvRV (coro_current));
1137		1211	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1138	#endif
1139		1212
1140	int	1213	int
		1214	prio (Coro::State coro, int newprio = 0)
		1215	ALIAS:
		1216	nice = 1
		1217	CODE:
		1218	{
		1219	RETVAL = coro->prio;
		1220
		1221	if (items > 1)
		1222	{
		1223	if (ix)
		1224	newprio += coro->prio;
		1225
		1226	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1227	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1228
		1229	coro->prio = newprio;
		1230	}
		1231	}
		1232
		1233	SV *
		1234	ready (SV *self)
		1235	PROTOTYPE: $
		1236	CODE:
		1237	RETVAL = boolSV (api_ready (self));
		1238	OUTPUT:
		1239	RETVAL
		1240
		1241	SV *
		1242	is_ready (SV *self)
		1243	PROTOTYPE: $
		1244	CODE:
		1245	RETVAL = boolSV (api_is_ready (self));
		1246	OUTPUT:
		1247	RETVAL
		1248
		1249	int
1141	nready(...)	1250	nready (...)
1142	PROTOTYPE:	1251	PROTOTYPE:
1143	CODE:	1252	CODE:
1144	RETVAL = coro_nready;	1253	RETVAL = coro_nready;
1145	OUTPUT:	1254	OUTPUT:
1146	RETVAL	1255	RETVAL
1147		1256
1148	void	1257	MODULE = Coro::State PACKAGE = Coro::AIO
1149	schedule(...)	1258
1150	PROTOTYPE:	1259	SV *
		1260	_get_state ()
1151	CODE:	1261	CODE:
1152	api_schedule ();
1153
1154	void
1155	cede(...)
1156	PROTOTYPE:
1157	CODE:
1158	api_cede ();
1159
1160	# and these are hacks
1161	SV *
1162	_aio_get_state ()
1163	CODE:
1164	{	1262	{
1165	struct {	1263	struct io_state *data;
1166	int errorno;
1167	int laststype;
1168	int laststatval;
1169	Stat_t statcache;
1170	} data;
1171		1264
		1265	RETVAL = newSV (sizeof (struct io_state));
		1266	data = (struct io_state *)SvPVX (RETVAL);
		1267	SvCUR_set (RETVAL, sizeof (struct io_state));
		1268	SvPOK_only (RETVAL);
		1269
1172	data.errorno = errno;	1270	data->errorno = errno;
1173	data.laststype = PL_laststype;	1271	data->laststype = PL_laststype;
1174	data.laststatval = PL_laststatval;	1272	data->laststatval = PL_laststatval;
1175	data.statcache = PL_statcache;	1273	data->statcache = PL_statcache;
1176
1177	RETVAL = newSVpvn ((char *)&data, sizeof data);
1178	}	1274	}
1179	OUTPUT:	1275	OUTPUT:
1180	RETVAL	1276	RETVAL
1181		1277
1182	void	1278	void
1183	_aio_set_state (char *data_)	1279	_set_state (char *data_)
1184	PROTOTYPE: $	1280	PROTOTYPE: $
1185	CODE:	1281	CODE:
1186	{	1282	{
1187	struct {	1283	struct io_state *data = (void *)data_;
1188	int errorno;
1189	int laststype;
1190	int laststatval;
1191	Stat_t statcache;
1192	} *data = (void *)data_;
1193		1284
1194	errno = data->errorno;	1285	errno = data->errorno;
1195	PL_laststype = data->laststype;	1286	PL_laststype = data->laststype;
1196	PL_laststatval = data->laststatval;	1287	PL_laststatval = data->laststatval;
1197	PL_statcache = data->statcache;	1288	PL_statcache = data->statcache;
1198	}	1289	}
		1290

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