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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.29 by root, Sat Aug 25 21:40:34 2001 UTC vs.
Revision 1.129 by root, Fri Dec 22 04:34:04 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
6		8
7	#include <signal.h>	9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
8		12
9	#ifdef HAVE_MMAP	13	#ifdef HAVE_MMAP
10	# include <unistd.h>	14	# include <unistd.h>
11	# include <sys/mman.h>	15	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	16	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
15	# else	19	# else
16	# undef HAVE_MMAP	20	# undef HAVE_MMAP
17	# endif	21	# endif
18	# endif	22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
19	#endif	30	# endif
		31	#else
		32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
20		35
21	#define MAY_FLUSH /* increases codesize and is rarely used */	36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
22		39
23	#define SUB_INIT "Coro::State::initialize"	40	/* the maximum number of idle cctx that will be pooled */
24	#define UCORO_STATE "_coro_state"	41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
		50	# ifndef PL_ppaddr
		51	# define PL_ppaddr ppaddr
		52	# endif
		53	# ifndef call_sv
		54	# define call_sv perl_call_sv
		55	# endif
		56	# ifndef get_sv
		57	# define get_sv perl_get_sv
		58	# endif
		59	# ifndef get_cv
		60	# define get_cv perl_get_cv
		61	# endif
		62	# ifndef IS_PADGV
		63	# define IS_PADGV(v) 0
		64	# endif
		65	# ifndef IS_PADCONST
		66	# define IS_PADCONST(v) 0
		67	# endif
		68	#endif
		69
		70	/* 5.8.7 */
		71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
		74
		75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		76	# undef STACKGUARD
		77	#endif
		78
		79	#ifndef STACKGUARD
		80	# define STACKGUARD 0
		81	#endif
		82
		83	/* prefer perl internal functions over our own? */
		84	#ifndef PREFER_PERL_FUNCTIONS
		85	# define PREFER_PERL_FUNCTIONS 0
		86	#endif
25		87
26	/* The next macro should declare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
27	* to the current C stack pointer. Its property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
28	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
30		93
31	#define labs(l) ((l) >= 0 ? (l) : -(l))	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
		95
		96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	#else
		99	# define attribute(x)
		100	#endif
		101
		102	#define NOINLINE attribute ((noinline))
32		103
33	#include "CoroAPI.h"	104	#include "CoroAPI.h"
34		105
		106	#ifdef USE_ITHREADS
		107	static perl_mutex coro_mutex;
		108	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		109	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		110	#else
		111	# define LOCK (void)0
		112	# define UNLOCK (void)0
		113	#endif
		114
		115	struct io_state
		116	{
		117	int errorno;
		118	I32 laststype;
		119	int laststatval;
		120	Stat_t statcache;
		121	};
		122
35	static struct CoroAPI coroapi;	123	static struct CoroAPI coroapi;
		124	static AV *main_mainstack; /* used to differentiate between $main and others */
		125	static HV *coro_state_stash, *coro_stash;
		126	static SV *coro_mortal; /* will be freed after next transfer */
36		127
37	/* this is actually not only the c stack but also c registers etc... */	128	static struct coro_cctx *cctx_first;
		129	static int cctx_count, cctx_idle;
		130
		131	/* this is a structure representing a c-level coroutine */
38	typedef struct {	132	typedef struct coro_cctx {
39	int refcnt; /* pointer reference counter */	133	struct coro_cctx *next;
40	int usecnt; /* shared by how many coroutines */
41	int gencnt; /* generation counter */
42		134
43	coro_context cctx;	135	/* the stack */
44
45	void *sptr;	136	void *sptr;
46	long ssize; /* positive == mmap, otherwise malloc */	137	long ssize; /* positive == mmap, otherwise malloc */
47	} coro_stack;
48		138
		139	/* cpu state */
		140	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		141	JMPENV *top_env;
		142	coro_context cctx;
		143
		144	int inuse;
		145
		146	#if USE_VALGRIND
		147	int valgrind_id;
		148	#endif
		149	} coro_cctx;
		150
		151	enum {
		152	CF_RUNNING = 0x0001, /* coroutine is running */
		153	CF_READY = 0x0002, /* coroutine is ready */
		154	CF_NEW = 0x0004, /* ahs never been switched to */
		155	};
		156
		157	/* this is a structure representing a perl-level coroutine */
49	struct coro {	158	struct coro {
50	/* the optional C context */	159	/* the c coroutine allocated to this perl coroutine, if any */
51	coro_stack *stack;	160	coro_cctx *cctx;
52	void *cursp;
53	int gencnt;
54
55	/* optionally saved, might be zero */
56	AV *defav;
57	SV *defsv;
58	SV *errsv;
59
60	/* saved global state not related to stacks */
61	U8 dowarn;
62	I32 in_eval;
63
64	/* the stacks and related info (callchain etc..) */
65	PERL_SI *curstackinfo;
66	AV *curstack;
67	AV *mainstack;
68	SV **stack_sp;
69	OP *op;
70	SV **curpad;
71	SV **stack_base;
72	SV **stack_max;
73	SV **tmps_stack;
74	I32 tmps_floor;
75	I32 tmps_ix;
76	I32 tmps_max;
77	I32 *markstack;
78	I32 *markstack_ptr;
79	I32 *markstack_max;
80	I32 *scopestack;
81	I32 scopestack_ix;
82	I32 scopestack_max;
83	ANY *savestack;
84	I32 savestack_ix;
85	I32 savestack_max;
86	OP **retstack;
87	I32 retstack_ix;
88	I32 retstack_max;
89	COP *curcop;
90	JMPENV *top_env;
91		161
92	/* data associated with this coroutine (initial args) */	162	/* data associated with this coroutine (initial args) */
93	AV *args;	163	AV *args;
		164	int refcnt;
		165	int save; /* CORO_SAVE flags */
		166	int flags; /* CF_ flags */
		167
		168	/* optionally saved, might be zero */
		169	AV *defav; /* @_ */
		170	SV *defsv; /* $_ */
		171	SV *errsv; /* $@ */
		172	SV *irssv; /* $/ */
		173	SV *irssv_sv; /* real $/ cache */
		174
		175	#define VAR(name,type) type name;
		176	# include "state.h"
		177	#undef VAR
		178
		179	/* coro process data */
		180	int prio;
94	};	181	};
95		182
96	typedef struct coro *Coro__State;	183	typedef struct coro *Coro__State;
97	typedef struct coro *Coro__State_or_hashref;	184	typedef struct coro *Coro__State_or_hashref;
98		185
99	static AV *main_mainstack; /* used to differentiate between $main and others */	186	static AV *
100	static HV *coro_state_stash;	187	coro_clone_padlist (CV *cv)
101	static SV *ucoro_state_sv;
102	static U32 ucoro_state_hash;
103	static HV *padlist_cache;
104
105	/* mostly copied from op.c:cv_clone2 */
106	STATIC AV *
107	clone_padlist (AV *protopadlist)
108	{	188	{
109	AV *av;	189	AV *padlist = CvPADLIST (cv);
110	I32 ix;
111	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
112	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
113	SV **pname = AvARRAY (protopad_name);
114	SV **ppad = AvARRAY (protopad);
115	I32 fname = AvFILLp (protopad_name);
116	I32 fpad = AvFILLp (protopad);
117	AV *newpadlist, *newpad_name, *newpad;	190	AV *newpadlist, *newpad;
118	SV **npad;
119
120	newpad_name = newAV ();
121	for (ix = fname; ix >= 0; ix--)
122	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
123
124	newpad = newAV ();
125	av_fill (newpad, AvFILLp (protopad));
126	npad = AvARRAY (newpad);
127		191
128	newpadlist = newAV ();	192	newpadlist = newAV ();
129	AvREAL_off (newpadlist);	193	AvREAL_off (newpadlist);
130	av_store (newpadlist, 0, (SV *) newpad_name);	194	#if PERL_VERSION_ATLEAST (5,9,0)
		195	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		196	#else
		197	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		198	#endif
		199	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		200	--AvFILLp (padlist);
		201
		202	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
131	av_store (newpadlist, 1, (SV *) newpad);	203	av_store (newpadlist, 1, (SV *)newpad);
132		204
133	av = newAV (); /* will be @_ */	205	return newpadlist;
134	av_extend (av, 0);	206	}
135	av_store (newpad, 0, (SV *) av);
136	AvFLAGS (av) = AVf_REIFY;
137		207
138	for (ix = fpad; ix > 0; ix--)	208	static void
		209	free_padlist (AV *padlist)
		210	{
		211	/* may be during global destruction */
		212	if (SvREFCNT (padlist))
139	{	213	{
140	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	214	I32 i = AvFILLp (padlist);
141	if (namesv && namesv != &PL_sv_undef)	215	while (i >= 0)
142	{	216	{
143	char *name = SvPVX (namesv); /* XXX */	217	SV **svp = av_fetch (padlist, i--, FALSE);
144	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	218	if (svp)
145	{ /* lexical from outside? */
146	npad[ix] = SvREFCNT_inc (ppad[ix]);
147	}	219	{
148	else
149	{ /* our own lexical */
150	SV *sv;	220	SV *sv;
151	if (*name == '&')	221	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
152	sv = SvREFCNT_inc (ppad[ix]);	222	SvREFCNT_dec (sv);
153	else if (*name == '@')	223
154	sv = (SV *) newAV ();	224	SvREFCNT_dec (*svp);
155	else if (*name == '%')
156	sv = (SV *) newHV ();
157	else
158	sv = NEWSV (0, 0);
159	if (!SvPADBUSY (sv))
160	SvPADMY_on (sv);
161	npad[ix] = sv;
162	}	225	}
163	}	226	}
164	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
165	{
166	npad[ix] = SvREFCNT_inc (ppad[ix]);
167	}
168	else
169	{
170	SV *sv = NEWSV (0, 0);
171	SvPADTMP_on (sv);
172	npad[ix] = sv;
173	}
174	}
175		227
176	#if 0 /* return -ENOTUNDERSTOOD */
177	/* Now that vars are all in place, clone nested closures. */
178
179	for (ix = fpad; ix > 0; ix--) {
180	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
181	if (namesv
182	&& namesv != &PL_sv_undef
183	&& !(SvFLAGS(namesv) & SVf_FAKE)
184	&& *SvPVX(namesv) == '&'
185	&& CvCLONE(ppad[ix]))
186	{
187	CV *kid = cv_clone((CV*)ppad[ix]);
188	SvREFCNT_dec(ppad[ix]);
189	CvCLONE_on(kid);
190	SvPADMY_on(kid);
191	npad[ix] = (SV*)kid;
192	}
193	}
194	#endif
195
196	return newpadlist;
197	}
198
199	#ifdef MAY_FLUSH
200	STATIC void
201	free_padlist (AV *padlist)
202	{
203	/* may be during global destruction */
204	if (SvREFCNT(padlist))
205	{
206	I32 i = AvFILLp(padlist);
207	while (i >= 0)
208	{
209	SV **svp = av_fetch(padlist, i--, FALSE);
210	SV *sv = svp ? *svp : Nullsv;
211	if (sv)
212	SvREFCNT_dec(sv);
213	}
214
215	SvREFCNT_dec((SV*)padlist);	228	SvREFCNT_dec ((SV*)padlist);
216	}	229	}
217	}	230	}
218	#endif	231
		232	static int
		233	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		234	{
		235	AV *padlist;
		236	AV *av = (AV *)mg->mg_obj;
		237
		238	/* casting is fun. */
		239	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		240	free_padlist (padlist);
		241
		242	SvREFCNT_dec (av);
		243
		244	return 0;
		245	}
		246
		247	#define PERL_MAGIC_coro PERL_MAGIC_ext
		248
		249	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
		250
		251	#define CORO_MAGIC(cv) \
		252	SvMAGIC (cv) \
		253	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		254	? SvMAGIC (cv) \
		255	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		256	: 0
219		257
220	/* the next two functions merely cache the padlists */	258	/* the next two functions merely cache the padlists */
221	STATIC void	259	static void
222	get_padlist (CV *cv)	260	get_padlist (CV *cv)
223	{	261	{
224	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	262	MAGIC *mg = CORO_MAGIC (cv);
		263	AV *av;
225		264
226	if (he && AvFILLp ((AV *)*he) >= 0)	265	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
227	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	266	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
228	else	267	else
		268	{
		269	#if PREFER_PERL_FUNCTIONS
		270	/* this is probably cleaner, but also slower? */
		271	CV *cp = Perl_cv_clone (cv);
		272	CvPADLIST (cv) = CvPADLIST (cp);
		273	CvPADLIST (cp) = 0;
		274	SvREFCNT_dec (cp);
		275	#else
229	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));	276	CvPADLIST (cv) = coro_clone_padlist (cv);
		277	#endif
		278	}
230	}	279	}
231		280
232	STATIC void	281	static void
233	put_padlist (CV *cv)	282	put_padlist (CV *cv)
234	{	283	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);	284	MAGIC *mg = CORO_MAGIC (cv);
		285	AV *av;
236		286
237	if (SvTYPE (*he) != SVt_PVAV)	287	if (!mg)
238	{
239	SvREFCNT_dec (*he);
240	*he = (SV *)newAV ();
241	}	288	{
242		289	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
243	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	290	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
244	}	291	mg->mg_virtual = &vtbl_coro;
245		292	mg->mg_obj = (SV *)newAV ();
246	#ifdef MAY_FLUSH
247	STATIC void
248	flush_padlist_cache ()
249	{
250	HV *hv = padlist_cache;
251	padlist_cache = newHV ();
252
253	if (hv_iterinit (hv))
254	{	293	}
255	HE *he;
256	AV *padlist;
257		294
258	while (!!(he = hv_iternext (hv)))	295	av = (AV *)mg->mg_obj;
259	{
260	AV *av = (AV *)HeVAL(he);
261		296
262	/* casting is fun. */	297	if (AvFILLp (av) >= AvMAX (av))
263	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	298	av_extend (av, AvMAX (av) + 1);
264	free_padlist (padlist);
265	}
266	}
267		299
268	SvREFCNT_dec (hv);	300	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
269	}	301	}
270	#endif
271		302
272	#define SB do {	303	#define SB do {
273	#define SE } while (0)	304	#define SE } while (0)
274		305
275	#define LOAD(state) load_state(aTHX_ (state));
276	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
277
278	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	306	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
279		307
280	static void	308	static void
281	load_state(pTHX_ Coro__State c)	309	load_perl (Coro__State c)
282	{	310	{
283	PL_dowarn = c->dowarn;	311	#define VAR(name,type) PL_ ## name = c->name;
284	PL_in_eval = c->in_eval;	312	# include "state.h"
285		313	#undef VAR
286	PL_curstackinfo = c->curstackinfo;
287	PL_curstack = c->curstack;
288	PL_mainstack = c->mainstack;
289	PL_stack_sp = c->stack_sp;
290	PL_op = c->op;
291	PL_curpad = c->curpad;
292	PL_stack_base = c->stack_base;
293	PL_stack_max = c->stack_max;
294	PL_tmps_stack = c->tmps_stack;
295	PL_tmps_floor = c->tmps_floor;
296	PL_tmps_ix = c->tmps_ix;
297	PL_tmps_max = c->tmps_max;
298	PL_markstack = c->markstack;
299	PL_markstack_ptr = c->markstack_ptr;
300	PL_markstack_max = c->markstack_max;
301	PL_scopestack = c->scopestack;
302	PL_scopestack_ix = c->scopestack_ix;
303	PL_scopestack_max = c->scopestack_max;
304	PL_savestack = c->savestack;
305	PL_savestack_ix = c->savestack_ix;
306	PL_savestack_max = c->savestack_max;
307	PL_retstack = c->retstack;
308	PL_retstack_ix = c->retstack_ix;
309	PL_retstack_max = c->retstack_max;
310	PL_curcop = c->curcop;
311	PL_top_env = c->top_env;
312		314
313	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	315	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
314	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	316	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
315	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	317	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		318	if (c->irssv)
		319	{
		320	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		321	SvREFCNT_dec (c->irssv);
		322	else
		323	{
		324	REPLACE_SV (PL_rs, c->irssv);
		325	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		326	sv_setsv (c->irssv_sv, PL_rs);
		327	}
		328	}
316		329
317	{	330	{
318	dSP;	331	dSP;
319	CV *cv;	332	CV *cv;
320		333
321	/* now do the ugly restore mess */	334	/* now do the ugly restore mess */
322	while ((cv = (CV *)POPs))	335	while ((cv = (CV *)POPs))
323	{	336	{
324	AV *padlist = (AV *)POPs;
325
326	if (padlist)
327	{
328	put_padlist (cv); /* mark this padlist as available */	337	put_padlist (cv); /* mark this padlist as available */
329	CvPADLIST(cv) = padlist;	338	CvDEPTH (cv) = PTR2IV (POPs);
330	#ifdef USE_THREADS	339	CvPADLIST (cv) = (AV *)POPs;
331	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
332	#endif
333	}
334
335	++CvDEPTH(cv);
336	}	340	}
337		341
338	PUTBACK;	342	PUTBACK;
339	}	343	}
340	}	344	}
341		345
342	static void	346	static void
343	save_state(pTHX_ Coro__State c, int flags)	347	save_perl (Coro__State c)
344	{	348	{
345	{	349	{
346	dSP;	350	dSP;
347	I32 cxix = cxstack_ix;	351	I32 cxix = cxstack_ix;
348	PERL_CONTEXT *ccstk = cxstack;	352	PERL_CONTEXT *ccstk = cxstack;
…		…
351	/*	355	/*
352	* the worst thing you can imagine happens first - we have to save	356	* the worst thing you can imagine happens first - we have to save
353	* (and reinitialize) all cv's in the whole callchain :(	357	* (and reinitialize) all cv's in the whole callchain :(
354	*/	358	*/
355		359
		360	EXTEND (SP, 3 + 1);
356	PUSHs (Nullsv);	361	PUSHs (Nullsv);
357	/* this loop was inspired by pp_caller */	362	/* this loop was inspired by pp_caller */
358	for (;;)	363	for (;;)
359	{	364	{
360	do	365	while (cxix >= 0)
361	{	366	{
362	PERL_CONTEXT *cx = &ccstk[cxix--];	367	PERL_CONTEXT *cx = &ccstk[cxix--];
363		368
364	if (CxTYPE(cx) == CXt_SUB)	369	if (CxTYPE (cx) == CXt_SUB)
365	{	370	{
366	CV *cv = cx->blk_sub.cv;	371	CV *cv = cx->blk_sub.cv;
		372
367	if (CvDEPTH(cv))	373	if (CvDEPTH (cv))
368	{	374	{
369	#ifdef USE_THREADS
370	/*XPUSHs ((SV *)CvOWNER(cv));*/
371	/*CvOWNER(cv) = 0;*/
372	/*error must unlock this cv etc.. etc...*/
373	#endif
374	EXTEND (SP, CvDEPTH(cv)*2);	375	EXTEND (SP, 3);
375
376	while (--CvDEPTH(cv))
377	{
378	/* this tells the restore code to increment CvDEPTH */
379	PUSHs (Nullsv);
380	PUSHs ((SV *)cv);
381	}
382
383	PUSHs ((SV *)CvPADLIST(cv));	376	PUSHs ((SV *)CvPADLIST (cv));
		377	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
384	PUSHs ((SV *)cv);	378	PUSHs ((SV *)cv);
385		379
		380	CvDEPTH (cv) = 0;
386	get_padlist (cv); /* this is a monster */	381	get_padlist (cv);
387	}	382	}
388	}	383	}
389	else if (CxTYPE(cx) == CXt_FORMAT)
390	{
391	/* I never used formats, so how should I know how these are implemented? */
392	/* my bold guess is as a simple, plain sub... */
393	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
394	}
395	}	384	}
396	while (cxix >= 0);
397		385
398	if (top_si->si_type == PERLSI_MAIN)	386	if (top_si->si_type == PERLSI_MAIN)
399	break;	387	break;
400		388
401	top_si = top_si->si_prev;	389	top_si = top_si->si_prev;
…		…
404	}	392	}
405		393
406	PUTBACK;	394	PUTBACK;
407	}	395	}
408		396
409	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	397	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
410	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	398	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
411	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	399	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		400	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
412		401
413	c->dowarn = PL_dowarn;	402	#define VAR(name,type)c->name = PL_ ## name;
414	c->in_eval = PL_in_eval;	403	# include "state.h"
415		404	#undef VAR
416	c->curstackinfo = PL_curstackinfo;
417	c->curstack = PL_curstack;
418	c->mainstack = PL_mainstack;
419	c->stack_sp = PL_stack_sp;
420	c->op = PL_op;
421	c->curpad = PL_curpad;
422	c->stack_base = PL_stack_base;
423	c->stack_max = PL_stack_max;
424	c->tmps_stack = PL_tmps_stack;
425	c->tmps_floor = PL_tmps_floor;
426	c->tmps_ix = PL_tmps_ix;
427	c->tmps_max = PL_tmps_max;
428	c->markstack = PL_markstack;
429	c->markstack_ptr = PL_markstack_ptr;
430	c->markstack_max = PL_markstack_max;
431	c->scopestack = PL_scopestack;
432	c->scopestack_ix = PL_scopestack_ix;
433	c->scopestack_max = PL_scopestack_max;
434	c->savestack = PL_savestack;
435	c->savestack_ix = PL_savestack_ix;
436	c->savestack_max = PL_savestack_max;
437	c->retstack = PL_retstack;
438	c->retstack_ix = PL_retstack_ix;
439	c->retstack_max = PL_retstack_max;
440	c->curcop = PL_curcop;
441	c->top_env = PL_top_env;
442	}	405	}
443		406
444	/*	407	/*
445	* allocate various perl stacks. This is an exact copy	408	* allocate various perl stacks. This is an exact copy
446	* of perl.c:init_stacks, except that it uses less memory	409	* of perl.c:init_stacks, except that it uses less memory
447	* on the assumption that coroutines do not usually need	410	* on the (sometimes correct) assumption that coroutines do
448	* a lot of stackspace.	411	* not usually need a lot of stackspace.
449	*/	412	*/
450	STATIC void	413	#if PREFER_PERL_FUNCTIONS
		414	# define coro_init_stacks init_stacks
		415	#else
		416	static void
451	coro_init_stacks (pTHX)	417	coro_init_stacks ()
452	{	418	{
453	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
454	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
455	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
456	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
457		423
458	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
459	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
460	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
461		427
462	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
463	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
464	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
465	PL_tmps_max = 96;	431	PL_tmps_max = 128;
466		432
467	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
468	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
469	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
470		436
		437	#ifdef SET_MARK_OFFSET
471	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
		439	#endif
472		440
473	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
474	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
475	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
476		444
477	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
478	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
479	PL_savestack_max = 96;	447	PL_savestack_max = 64;
480		448
		449	#if !PERL_VERSION_ATLEAST (5,9,0)
481	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
482	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
483	PL_retstack_max = 8;	452	PL_retstack_max = 16;
		453	#endif
484	}	454	}
		455	#endif
485		456
486	/*	457	/*
487	* destroy the stacks, the callchain etc...	458	* destroy the stacks, the callchain etc...
488	* still there is a memleak of 128 bytes...
489	*/	459	*/
490	STATIC void	460	static void
491	destroy_stacks(pTHX)	461	coro_destroy_stacks ()
492	{	462	{
493	/* is this ugly, I ask? */	463	if (!IN_DESTRUCT)
494	while (PL_scopestack_ix)	464	{
495	LEAVE;	465	/* restore all saved variables and stuff */
		466	LEAVE_SCOPE (0);
		467	assert (PL_tmps_floor == -1);
496		468
497	/* sure it is, but more important: is it correct?? :/ */	469	/* free all temporaries */
498	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
499	FREETMPS;	470	FREETMPS;
		471	assert (PL_tmps_ix == -1);
		472
		473	POPSTACK_TO (PL_mainstack);
		474	}
500		475
501	while (PL_curstackinfo->si_next)	476	while (PL_curstackinfo->si_next)
502	PL_curstackinfo = PL_curstackinfo->si_next;	477	PL_curstackinfo = PL_curstackinfo->si_next;
503		478
504	while (PL_curstackinfo)	479	while (PL_curstackinfo)
505	{	480	{
506	PERL_SI *p = PL_curstackinfo->si_prev;	481	PERL_SI *p = PL_curstackinfo->si_prev;
507		482
508	{	483	if (!IN_DESTRUCT)
509	dSP;
510	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
511	PUTBACK; /* possibly superfluous */
512	}
513
514	if (PL_main_cv != Nullcv) /* don't during destruction. hack? */
515	dounwind(-1);
516
517	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
		485
518	Safefree(PL_curstackinfo->si_cxstack);	486	Safefree (PL_curstackinfo->si_cxstack);
519	Safefree(PL_curstackinfo);	487	Safefree (PL_curstackinfo);
520	PL_curstackinfo = p;	488	PL_curstackinfo = p;
521	}	489	}
522		490
523	Safefree(PL_tmps_stack);	491	Safefree (PL_tmps_stack);
524	Safefree(PL_markstack);	492	Safefree (PL_markstack);
525	Safefree(PL_scopestack);	493	Safefree (PL_scopestack);
526	Safefree(PL_savestack);	494	Safefree (PL_savestack);
		495	#if !PERL_VERSION_ATLEAST (5,9,0)
527	Safefree(PL_retstack);	496	Safefree (PL_retstack);
528	}
529
530	static void
531	allocate_stack (Coro__State ctx, int alloc)
532	{
533	coro_stack *stack;
534
535	New (0, stack, 1, coro_stack);
536
537	stack->refcnt = 1;
538	stack->usecnt = 1;
539	stack->gencnt = ctx->gencnt = 0;
540	if (alloc)
541	{
542	#ifdef HAVE_MMAP
543	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
544	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
545	if (stack->sptr == (void *)-1)
546	#endif	497	#endif
547	{
548	/*FIXME*//*D*//* reasonable stack size! */
549	stack->ssize = -4096 * sizeof (long);
550	New (0, stack->sptr, 4096, long);
551	}
552	}
553	else
554	stack->sptr = 0;
555
556	ctx->stack = stack;
557	}	498	}
558		499
559	static void	500	static void
560	deallocate_stack (Coro__State ctx)	501	setup_coro (struct coro *coro)
561	{
562	coro_stack *stack = ctx->stack;
563
564	ctx->stack = 0;
565
566	if (stack)
567	{
568	if (!--stack->refcnt)
569	{
570	#ifdef HAVE_MMAP
571	if (stack->ssize > 0 && stack->sptr)
572	munmap (stack->sptr, stack->ssize);
573	else
574	#else
575	Safefree (stack->sptr);
576	#endif
577	Safefree (stack);
578	}
579	else if (ctx->gencnt == stack->gencnt)
580	--stack->usecnt;
581	}
582	}
583
584	static void
585	setup_coro (void *arg)
586	{	502	{
587	/*	503	/*
588	* emulate part of the perl startup here.	504	* emulate part of the perl startup here.
589	*/	505	*/
		506
		507	coro_init_stacks ();
		508
		509	PL_curcop = &PL_compiling;
		510	PL_in_eval = EVAL_NULL;
		511	PL_curpm = 0;
		512	PL_localizing = 0;
		513	PL_dirty = 0;
		514	PL_restartop = 0;
		515
		516	{
		517	dSP;
		518	LOGOP myop;
		519
		520	SvREFCNT_dec (GvAV (PL_defgv));
		521	GvAV (PL_defgv) = coro->args; coro->args = 0;
		522
		523	Zero (&myop, 1, LOGOP);
		524	myop.op_next = Nullop;
		525	myop.op_flags = OPf_WANT_VOID;
		526
		527	PUSHMARK (SP);
		528	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		529	PUTBACK;
		530	PL_op = (OP *)&myop;
		531	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		532	SPAGAIN;
		533	}
		534
		535	ENTER; /* necessary e.g. for dounwind */
		536	}
		537
		538	static void
		539	free_coro_mortal ()
		540	{
		541	if (coro_mortal)
		542	{
		543	SvREFCNT_dec (coro_mortal);
		544	coro_mortal = 0;
		545	}
		546	}
		547
		548	/* inject a fake call to Coro::State::_cctx_init into the execution */
		549	static void NOINLINE
		550	prepare_cctx (coro_cctx *cctx)
		551	{
590	dSP;	552	dSP;
591	Coro__State ctx = (Coro__State)arg;	553	LOGOP myop;
592	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
593		554
594	coro_init_stacks (aTHX);	555	Zero (&myop, 1, LOGOP);
595	/*PL_curcop = 0;*/	556	myop.op_next = PL_op;
596	/*PL_in_eval = PL_in_eval;*/ /* inherit */	557	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
597	SvREFCNT_dec (GvAV (PL_defgv));
598	GvAV (PL_defgv) = ctx->args;
599		558
		559	PUSHMARK (SP);
		560	EXTEND (SP, 2);
		561	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		562	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		563	PUTBACK;
		564	PL_op = (OP *)&myop;
		565	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
600	SPAGAIN;	566	SPAGAIN;
601
602	if (ctx->stack)
603	{
604	ctx->cursp = 0;
605
606	PUSHMARK(SP);
607	PUTBACK;
608	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
609
610	if (SvTRUE (ERRSV))
611	croak (NULL);
612	else
613	croak ("FATAL: CCTXT coroutine returned!");
614	}
615	else
616	{
617	UNOP myop;
618
619	PL_op = (OP *)&myop;
620
621	Zero(&myop, 1, UNOP);
622	myop.op_next = Nullop;
623	myop.op_flags = OPf_WANT_VOID;
624
625	PUSHMARK(SP);
626	XPUSHs (sub_init);
627	/*
628	* the next line is slightly wrong, as PL_op->op_next
629	* is actually being executed so we skip the first op.
630	* that doesn't matter, though, since it is only
631	* pp_nextstate and we never return...
632	* ah yes, and I don't care anyways ;)
633	*/
634	PUTBACK;
635	PL_op = pp_entersub();
636	SPAGAIN;
637
638	ENTER; /* necessary e.g. for dounwind */
639	}
640	}	567	}
641		568
642	static void	569	static void
643	continue_coro (void *arg)	570	coro_run (void *arg)
644	{	571	{
		572	/* coro_run is the alternative tail of transfer(), so unlock here. */
		573	UNLOCK;
		574
645	/*	575	/*
646	* this is a _very_ stripped down perl interpreter ;)	576	* this is a _very_ stripped down perl interpreter ;)
647	*/	577	*/
648	Coro__State ctx = (Coro__State)arg;	578	PL_top_env = &PL_start_env;
649		579
650	/*FIXME*//* must set up top_env here */	580	/* inject call to cctx_init */
651	ctx->cursp = 0;	581	prepare_cctx ((coro_cctx *)arg);
652	PL_op = PL_op->op_next;
653	CALLRUNOPS(aTHX);
654		582
		583	/* somebody will hit me for both perl_run and PL_restartop */
		584	PL_restartop = PL_op;
		585	perl_run (PL_curinterp);
		586
		587	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
655	abort ();	588	abort ();
656	}	589	}
657		590
658	STATIC void	591	static coro_cctx *
		592	cctx_new ()
		593	{
		594	coro_cctx *cctx;
		595
		596	++cctx_count;
		597
		598	Newz (0, cctx, 1, coro_cctx);
		599
		600	#if HAVE_MMAP
		601
		602	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		603	/* mmap supposedly does allocate-on-write for us */
		604	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		605
		606	if (cctx->sptr == (void *)-1)
		607	{
		608	perror ("FATAL: unable to mmap stack for coroutine");
		609	_exit (EXIT_FAILURE);
		610	}
		611
		612	# if STACKGUARD
		613	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		614	# endif
		615
		616	#else
		617
		618	cctx->ssize = STACKSIZE * (long)sizeof (long);
		619	New (0, cctx->sptr, STACKSIZE, long);
		620
		621	if (!cctx->sptr)
		622	{
		623	perror ("FATAL: unable to malloc stack for coroutine");
		624	_exit (EXIT_FAILURE);
		625	}
		626
		627	#endif
		628
		629	#if USE_VALGRIND
		630	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		631	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		632	cctx->ssize + (char *)cctx->sptr
		633	);
		634	#endif
		635
		636	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		637
		638	return cctx;
		639	}
		640
		641	static void
		642	cctx_destroy (coro_cctx *cctx)
		643	{
		644	if (!cctx)
		645	return;
		646
		647	--cctx_count;
		648
		649	#if USE_VALGRIND
		650	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		651	#endif
		652
		653	#if HAVE_MMAP
		654	munmap (cctx->sptr, cctx->ssize);
		655	#else
		656	Safefree (cctx->sptr);
		657	#endif
		658
		659	Safefree (cctx);
		660	}
		661
		662	static coro_cctx *
		663	cctx_get ()
		664	{
		665	coro_cctx *cctx;
		666
		667	if (cctx_first)
		668	{
		669	cctx = cctx_first;
		670	cctx_first = cctx->next;
		671	--cctx_idle;
		672	}
		673	else
		674	{
		675	cctx = cctx_new ();
		676	PL_op = PL_op->op_next;
		677	}
		678
		679	return cctx;
		680	}
		681
		682	static void
		683	cctx_put (coro_cctx *cctx)
		684	{
		685	/* free another cctx if overlimit */
		686	if (cctx_idle >= MAX_IDLE_CCTX)
		687	{
		688	coro_cctx *first = cctx_first;
		689	cctx_first = first->next;
		690	--cctx_idle;
		691
		692	assert (!first->inuse);
		693	cctx_destroy (first);
		694	}
		695
		696	++cctx_idle;
		697	cctx->next = cctx_first;
		698	cctx_first = cctx;
		699	}
		700
		701	/* never call directly, always through the coro_state_transfer global variable */
		702	static void NOINLINE
659	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	703	transfer (struct coro *prev, struct coro *next)
660	{	704	{
661	dSTACKLEVEL;	705	dSTACKLEVEL;
662	static struct coro *xnext;
663		706
		707	/* sometimes transfer is only called to set idle_sp */
		708	if (!next)
		709	{
		710	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		711	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		712	}
664	if (prev != next)	713	else if (prev != next)
665	{	714	{
666	xnext = next;	715	coro_cctx *prev__cctx;
667		716
668	if (next->mainstack)	717	if (prev->flags & CF_NEW)
669	{	718	{
670	SAVE (prev, flags);	719	/* create a new empty context */
671	LOAD (next);	720	Newz (0, prev->cctx, 1, coro_cctx);
672		721	prev->cctx->inuse = 1;
673	/* mark this state as in-use */	722	prev->flags &= ~CF_NEW;
674	next->mainstack = 0;	723	prev->flags |= CF_RUNNING;
675	next->tmps_ix = -2;
676
677	/* stacklevel changed? if yes, grab the stack for us! */
678	if (flags & TRANSFER_SAVE_CCTXT)
679	{
680	if (!prev->stack)
681	allocate_stack (prev, 0);
682	else if (prev->cursp != stacklevel
683	&& prev->stack->usecnt > 1)
684	{
685	prev->gencnt = ++prev->stack->gencnt;
686	prev->stack->usecnt = 1;
687	}
688
689	/* has our stack been invalidated? */
690	if (next->stack && next->stack->gencnt != next->gencnt)
691	{
692	deallocate_stack (next);
693	allocate_stack (next, 1);
694	coro_create (&(next->stack->cctx),
695	continue_coro, (void *)next,
696	next->stack->sptr, labs (next->stack->ssize));
697	}
698
699	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
700	/* don't add any code here */
701	}
702
703	}	724	}
704	else if (next->tmps_ix == -2)	725
705	croak ("tried to transfer to running coroutine");	726	/*TODO: must not croak here */
		727	if (!prev->flags & CF_RUNNING)
		728	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		729
		730	if (next->flags & CF_RUNNING)
		731	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		732
		733	prev->flags &= ~CF_RUNNING;
		734	next->flags |= CF_RUNNING;
		735
		736	LOCK;
		737
		738	if (next->flags & CF_NEW)
		739	{
		740	/* need to start coroutine */
		741	next->flags &= ~CF_NEW;
		742	/* first get rid of the old state */
		743	save_perl (prev);
		744	/* setup coroutine call */
		745	setup_coro (next);
		746	/* need a new stack */
		747	assert (!next->cctx);
		748	}
706	else	749	else
707	{	750	{
708	SAVE (prev, -1); /* first get rid of the old state */	751	/* coroutine already started */
709		752	save_perl (prev);
710	if (flags & TRANSFER_SAVE_CCTXT)	753	load_perl (next);
711	{
712	if (!prev->stack)
713	allocate_stack (prev, 0);
714
715	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
716	{
717	setup_coro (next);
718
719	prev->stack->refcnt++;
720	prev->stack->usecnt++;
721	next->stack = prev->stack;
722	next->gencnt = prev->gencnt;
723	}
724	else
725	{
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	setup_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
731	/* don't add any code here */
732	}
733	}
734	else
735	setup_coro (next);
736	}	754	}
		755
		756	prev__cctx = prev->cctx;
		757
		758	/* possibly "free" the cctx */
		759	if (prev__cctx->idle_sp == STACKLEVEL)
		760	{
		761	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		762	assert (PL_top_env == prev__cctx->top_env);
		763
		764	prev->cctx = 0;
		765
		766	cctx_put (prev__cctx);
		767	prev__cctx->inuse = 0;
		768	}
		769
		770	if (!next->cctx)
		771	{
		772	next->cctx = cctx_get ();
		773	assert (!next->cctx->inuse);
		774	next->cctx->inuse = 1;
		775	}
		776
		777	if (prev__cctx != next->cctx)
		778	{
		779	prev__cctx->top_env = PL_top_env;
		780	PL_top_env = next->cctx->top_env;
		781	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		782	}
		783
		784	free_coro_mortal ();
		785
		786	UNLOCK;
		787	}
		788	}
		789
		790	struct transfer_args
		791	{
		792	struct coro *prev, *next;
		793	};
		794
		795	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		796
		797	static void
		798	coro_state_destroy (struct coro *coro)
		799	{
		800	if (coro->refcnt--)
		801	return;
		802
		803	if (coro->mainstack && coro->mainstack != main_mainstack)
737	}	804	{
		805	struct coro temp;
		806	Zero (&temp, 1, struct coro);
		807	temp.save = CORO_SAVE_ALL;
738		808
739	/*	809	if (coro->flags & CF_RUNNING)
740	* xnext is now either prev or next, depending on wether	810	croak ("FATAL: tried to destroy currently running coroutine");
741	* we switched the c stack or not. that's why i use a global	811
742	* variable, that should become thread-specific at one point.	812	save_perl (&temp);
743	*/	813	load_perl (coro);
744	xnext->cursp = stacklevel;	814
		815	coro_destroy_stacks ();
		816
		817	load_perl (&temp); /* this will get rid of defsv etc.. */
		818
		819	coro->mainstack = 0;
		820	}
		821
		822	cctx_destroy (coro->cctx);
		823	SvREFCNT_dec (coro->args);
		824	Safefree (coro);
745	}	825	}
		826
		827	static int
		828	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		829	{
		830	struct coro *coro = (struct coro *)mg->mg_ptr;
		831	mg->mg_ptr = 0;
		832
		833	coro_state_destroy (coro);
		834
		835	return 0;
		836	}
		837
		838	static int
		839	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		840	{
		841	struct coro *coro = (struct coro *)mg->mg_ptr;
		842
		843	++coro->refcnt;
		844
		845	return 0;
		846	}
		847
		848	static MGVTBL coro_state_vtbl = {
		849	0, 0, 0, 0,
		850	coro_state_clear,
		851	0,
		852	#ifdef MGf_DUP
		853	coro_state_dup,
		854	#else
		855	# define MGf_DUP 0
		856	#endif
		857	};
746		858
747	static struct coro *	859	static struct coro *
748	sv_to_coro (SV *arg, const char *funcname, const char *varname)	860	SvSTATE (SV *coro)
749	{	861	{
750	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	862	HV *stash;
751	{	863	MAGIC *mg;
752	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);
753		864
754	if (!he)	865	if (SvROK (coro))
755	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);	866	coro = SvRV (coro);
756		867
757	arg = HeVAL(he);	868	stash = SvSTASH (coro);
		869	if (stash != coro_stash && stash != coro_state_stash)
758	}	870	{
		871	/* very slow, but rare, check */
		872	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		873	croak ("Coro::State object required");
759		874	}
760	/* must also be changed inside Coro::Cont::yield */
761	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
762	return (struct coro *) SvIV((SV*)SvRV(arg));
763		875
764	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	876	mg = SvMAGIC (coro);
765	/*NORETURN*/	877	assert (mg->mg_type == PERL_MAGIC_ext);
		878	return (struct coro *)mg->mg_ptr;
766	}	879	}
767		880
		881	static void
		882	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		883	{
		884	ta->prev = SvSTATE (prev_sv);
		885	ta->next = SvSTATE (next_sv);
		886	}
		887
		888	static void
		889	api_transfer (SV *prev_sv, SV *next_sv)
		890	{
		891	struct transfer_args ta;
		892
		893	prepare_transfer (&ta, prev_sv, next_sv);
		894	TRANSFER (ta);
		895	}
		896
768	static void	897	static int
769	api_transfer(pTHX_ SV *prev, SV *next, int flags)	898	api_save (SV *coro_sv, int new_save)
770	{	899	{
771	transfer(aTHX_	900	struct coro *coro = SvSTATE (coro_sv);
772	sv_to_coro (prev, "Coro::transfer", "prev"),	901	int old_save = coro->save;
773	sv_to_coro (next, "Coro::transfer", "next"),	902
774	flags);	903	if (new_save >= 0)
		904	coro->save = new_save;
		905
		906	return old_save;
775	}	907	}
776		908
777	/** Coro ********************************************************************/	909	/** Coro ********************************************************************/
778		910
779	#define PRIO_MAX 3	911	#define PRIO_MAX 3
…		…
782	#define PRIO_LOW -1	914	#define PRIO_LOW -1
783	#define PRIO_IDLE -3	915	#define PRIO_IDLE -3
784	#define PRIO_MIN -4	916	#define PRIO_MIN -4
785		917
786	/* for Coro.pm */	918	/* for Coro.pm */
787	static GV *coro_current, *coro_idle;	919	static SV *coro_current;
788	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	920	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
789	static int coro_nready;	921	static int coro_nready;
790		922
791	static void	923	static void
792	coro_enq (SV *sv)	924	coro_enq (SV *coro_sv)
793	{	925	{
794	if (SvROK (sv))	926	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
795	{
796	SV *hv = SvRV (sv);
797	if (SvTYPE (hv) == SVt_PVHV)
798	{
799	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
800	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
801
802	prio = prio > PRIO_MAX ? PRIO_MAX
803	: prio < PRIO_MIN ? PRIO_MIN
804	: prio;
805
806	av_push (coro_ready [prio - PRIO_MIN], sv);
807	coro_nready++;	927	coro_nready++;
808
809	return;
810	}
811	}
812
813	croak ("Coro::ready tried to enqueue something that is not a coroutine");
814	}	928	}
815		929
816	static SV *	930	static SV *
817	coro_deq (int min_prio)	931	coro_deq (int min_prio)
818	{	932	{
…		…
821	min_prio -= PRIO_MIN;	935	min_prio -= PRIO_MIN;
822	if (min_prio < 0)	936	if (min_prio < 0)
823	min_prio = 0;	937	min_prio = 0;
824		938
825	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	939	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
826	if (av_len (coro_ready[prio]) >= 0)	940	if (AvFILLp (coro_ready [prio]) >= 0)
827	{	941	{
828	coro_nready--;	942	coro_nready--;
829	return av_shift (coro_ready[prio]);	943	return av_shift (coro_ready [prio]);
830	}	944	}
831		945
832	return 0;	946	return 0;
833	}	947	}
834		948
835	static void	949	static int
836	api_ready (SV *coro)	950	api_ready (SV *coro_sv)
837	{	951	{
		952	struct coro *coro;
		953
		954	if (SvROK (coro_sv))
		955	coro_sv = SvRV (coro_sv);
		956
		957	coro = SvSTATE (coro_sv);
		958
		959	if (coro->flags & CF_READY)
		960	return 0;
		961
		962	coro->flags |= CF_READY;
		963
		964	LOCK;
838	coro_enq (SvREFCNT_inc (coro));	965	coro_enq (SvREFCNT_inc (coro_sv));
839	}	966	UNLOCK;
840		967
		968	return 1;
		969	}
		970
841	static void	971	static int
842	api_schedule (int cede)	972	api_is_ready (SV *coro_sv)
		973	{
		974	return !!SvSTATE (coro_sv)->flags & CF_READY;
		975	}
		976
		977	static void
		978	prepare_schedule (struct transfer_args *ta)
843	{	979	{
844	SV *prev, *next;	980	SV *prev, *next;
845		981
846	prev = GvSV (coro_current);	982	for (;;)
847		983	{
848	if (cede)	984	LOCK;
849	coro_enq (SvREFCNT_inc (prev));
850
851	next = coro_deq (PRIO_MIN);	985	next = coro_deq (PRIO_MIN);
		986	UNLOCK;
852		987
853	if (!next)	988	if (next)
854	next = SvREFCNT_inc (GvSV (coro_idle));	989	break;
855		990
856	GvSV (coro_current) = SvREFCNT_inc (next);	991	{
857	transfer (aTHX_	992	dSP;
858	sv_to_coro (prev, "Coro::schedule", "current coroutine"),	993
859	sv_to_coro (next, "Coro::schedule", "next coroutine"),	994	ENTER;
860	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	995	SAVETMPS;
861	SvREFCNT_dec (next);	996
862	SvREFCNT_dec (prev);	997	PUSHMARK (SP);
		998	PUTBACK;
		999	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1000
		1001	FREETMPS;
		1002	LEAVE;
		1003	}
		1004	}
		1005
		1006	prev = SvRV (coro_current);
		1007	SvRV_set (coro_current, next);
		1008
		1009	/* free this only after the transfer */
		1010	LOCK;
		1011	free_coro_mortal ();
		1012	UNLOCK;
		1013	coro_mortal = prev;
		1014
		1015	assert (!SvROK(prev));//D
		1016	assert (!SvROK(next));//D
		1017
		1018	ta->prev = SvSTATE (prev);
		1019	ta->next = SvSTATE (next);
		1020
		1021	assert (ta->next->flags & CF_READY);
		1022	ta->next->flags &= ~CF_READY;
		1023	}
		1024
		1025	static void
		1026	prepare_cede (struct transfer_args *ta)
		1027	{
		1028	api_ready (coro_current);
		1029
		1030	prepare_schedule (ta);
		1031	}
		1032
		1033	static void
		1034	api_schedule (void)
		1035	{
		1036	struct transfer_args ta;
		1037
		1038	prepare_schedule (&ta);
		1039	TRANSFER (ta);
		1040	}
		1041
		1042	static void
		1043	api_cede (void)
		1044	{
		1045	struct transfer_args ta;
		1046
		1047	prepare_cede (&ta);
		1048	TRANSFER (ta);
863	}	1049	}
864		1050
865	MODULE = Coro::State PACKAGE = Coro::State	1051	MODULE = Coro::State PACKAGE = Coro::State
866		1052
867	PROTOTYPES: ENABLE	1053	PROTOTYPES: DISABLE
868		1054
869	BOOT:	1055	BOOT:
870	{ /* {} necessary for stoopid perl-5.6.x */	1056	{
871	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1057	#ifdef USE_ITHREADS
872	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1058	MUTEX_INIT (&coro_mutex);
		1059	#endif
		1060	BOOT_PAGESIZE;
		1061
873	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1062	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
874		1063
875	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1064	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
876	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1065	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
877	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1066	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1067	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
878	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1068	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
879
880	if (!padlist_cache)
881	padlist_cache = newHV ();
882		1069
883	main_mainstack = PL_mainstack;	1070	main_mainstack = PL_mainstack;
884		1071
885	coroapi.ver = CORO_API_VERSION;	1072	coroapi.ver = CORO_API_VERSION;
886	coroapi.transfer = api_transfer;	1073	coroapi.transfer = api_transfer;
887	}
888		1074
889	Coro::State	1075	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
890	_newprocess(args)	1076	}
891	SV * args	1077
892	PROTOTYPE: $	1078	SV *
		1079	new (char *klass, ...)
893	CODE:	1080	CODE:
894	Coro__State coro;	1081	{
		1082	struct coro *coro;
		1083	HV *hv;
		1084	int i;
895		1085
896	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
897	croak ("Coro::State::_newprocess expects an arrayref");
898
899	New (0, coro, 1, struct coro);	1086	Newz (0, coro, 1, struct coro);
		1087	coro->args = newAV ();
		1088	coro->save = CORO_SAVE_ALL;
		1089	coro->flags = CF_NEW;
900		1090
901	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1091	hv = newHV ();
902	coro->mainstack = 0; /* actual work is done inside transfer */	1092	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
903	coro->stack = 0;	1093	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
904		1094
905	RETVAL = coro;	1095	for (i = 1; i < items; i++)
		1096	av_push (coro->args, newSVsv (ST (i)));
		1097	}
906	OUTPUT:	1098	OUTPUT:
907	RETVAL	1099	RETVAL
908		1100
		1101	int
		1102	save (SV *coro, int new_save = -1)
		1103	CODE:
		1104	RETVAL = api_save (coro, new_save);
		1105	OUTPUT:
		1106	RETVAL
		1107
909	void	1108	void
910	transfer(prev, next, flags)	1109	_set_stacklevel (...)
911	Coro::State_or_hashref prev	1110	ALIAS:
912	Coro::State_or_hashref next	1111	Coro::State::transfer = 1
913	int flags	1112	Coro::schedule = 2
914	PROTOTYPE: @	1113	Coro::cede = 3
915	CODE:	1114	CODE:
916	PUTBACK;	1115	{
917	transfer (aTHX_ prev, next, flags);	1116	struct transfer_args ta;
918	SPAGAIN;	1117
		1118	switch (ix)
		1119	{
		1120	case 0:
		1121	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1122	ta.next = 0;
		1123	break;
		1124
		1125	case 1:
		1126	if (items != 2)
		1127	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1128
		1129	prepare_transfer (&ta, ST (0), ST (1));
		1130	break;
		1131
		1132	case 2:
		1133	prepare_schedule (&ta);
		1134	break;
		1135
		1136	case 3:
		1137	prepare_cede (&ta);
		1138	break;
		1139	}
		1140
		1141	TRANSFER (ta);
		1142	}
919		1143
920	void	1144	void
921	DESTROY(coro)	1145	_clone_state_from (SV *dst, SV *src)
922	Coro::State coro	1146	CODE:
923	CODE:	1147	{
		1148	struct coro *coro_src = SvSTATE (src);
924		1149
925	if (coro->mainstack && coro->mainstack != main_mainstack)	1150	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
926	{
927	struct coro temp;
928		1151
929	PUTBACK;	1152	++coro_src->refcnt;
930	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1153	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
931	LOAD(aTHX_ coro);	1154	}
932	SPAGAIN;
933
934	destroy_stacks (aTHX);
935
936	LOAD((&temp)); /* this will get rid of defsv etc.. */
937	SPAGAIN;
938
939	coro->mainstack = 0;
940	}
941
942	deallocate_stack (coro);
943
944	Safefree (coro);
945		1155
946	void	1156	void
947	flush()
948	CODE:
949	#ifdef MAY_FLUSH
950	flush_padlist_cache ();
951	#endif
952
953	void
954	_exit(code)	1157	_exit (code)
955	int code	1158	int code
956	PROTOTYPE: $	1159	PROTOTYPE: $
957	CODE:	1160	CODE:
958	#if defined(__GLIBC__) || _POSIX_C_SOURCE
959	_exit (code);	1161	_exit (code);
960	#else
961	signal (SIGTERM, SIG_DFL);
962	raise (SIGTERM);
963	exit (code);
964	#endif
965		1162
966	MODULE = Coro::State PACKAGE = Coro::Cont	1163	int
		1164	cctx_count ()
		1165	CODE:
		1166	RETVAL = cctx_count;
		1167	OUTPUT:
		1168	RETVAL
967		1169
968	# this is slightly dirty (should expose a c-level api)	1170	int
969		1171	cctx_idle ()
970	void	1172	CODE:
971	yield(...)	1173	RETVAL = cctx_idle;
972	PROTOTYPE: @	1174	OUTPUT:
973	CODE:	1175	RETVAL
974	static SV *returnstk;
975	SV *sv;
976	AV *defav = GvAV (PL_defgv);
977	struct coro *prev, *next;
978
979	if (!returnstk)
980	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
981
982	/* set up @_ -- ugly */
983	av_clear (defav);
984	av_fill (defav, items - 1);
985	while (items--)
986	av_store (defav, items, SvREFCNT_inc (ST(items)));
987
988	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
989	sv = av_pop ((AV *)SvRV (returnstk));
990	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
991	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
992	SvREFCNT_dec (sv);
993
994	transfer(aTHX_ prev, next, 0);
995		1176
996	MODULE = Coro::State PACKAGE = Coro	1177	MODULE = Coro::State PACKAGE = Coro
997		1178
998	# this is slightly dirty (should expose a c-level api)
999
1000	BOOT:	1179	BOOT:
1001	{	1180	{
1002	int i;	1181	int i;
		1182
1003	HV *stash = gv_stashpv ("Coro", TRUE);	1183	coro_stash = gv_stashpv ("Coro", TRUE);
1004		1184
1005	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1185	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1006	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1186	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1007	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1187	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1008	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1188	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1009	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1189	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1010	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1190	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1011		1191
1012	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1192	coro_current = get_sv ("Coro::current", FALSE);
1013	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1193	SvREADONLY_on (coro_current);
1014		1194
1015	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1195	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1016	coro_ready[i] = newAV ();	1196	coro_ready[i] = newAV ();
1017		1197
1018	{	1198	{
1019	SV *sv = perl_get_sv("Coro::API", 1);	1199	SV *sv = perl_get_sv("Coro::API", 1);
1020		1200
1021	coroapi.schedule = api_schedule;	1201	coroapi.schedule = api_schedule;
		1202	coroapi.save = api_save;
		1203	coroapi.cede = api_cede;
1022	coroapi.ready = api_ready;	1204	coroapi.ready = api_ready;
		1205	coroapi.is_ready = api_is_ready;
1023	coroapi.nready = &coro_nready;	1206	coroapi.nready = &coro_nready;
1024	coroapi.current = coro_current;	1207	coroapi.current = coro_current;
1025		1208
1026	GCoroAPI = &coroapi;	1209	GCoroAPI = &coroapi;
1027	sv_setiv(sv, (IV)&coroapi);	1210	sv_setiv (sv, (IV)&coroapi);
1028	SvREADONLY_on(sv);	1211	SvREADONLY_on (sv);
1029	}	1212	}
1030	}	1213	}
1031		1214
1032	void	1215	void
1033	ready(self)	1216	_set_current (SV *current)
1034	SV * self	1217	PROTOTYPE: $
1035	CODE:	1218	CODE:
1036	api_ready (self);	1219	SvREFCNT_dec (SvRV (coro_current));
		1220	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1037		1221
1038	int	1222	int
		1223	prio (Coro::State coro, int newprio = 0)
		1224	ALIAS:
		1225	nice = 1
		1226	CODE:
		1227	{
		1228	RETVAL = coro->prio;
		1229
		1230	if (items > 1)
		1231	{
		1232	if (ix)
		1233	newprio = coro->prio - newprio;
		1234
		1235	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1236	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1237
		1238	coro->prio = newprio;
		1239	}
		1240	}
		1241
		1242	SV *
		1243	ready (SV *self)
		1244	PROTOTYPE: $
		1245	CODE:
		1246	RETVAL = boolSV (api_ready (self));
		1247	OUTPUT:
		1248	RETVAL
		1249
		1250	SV *
		1251	is_ready (SV *self)
		1252	PROTOTYPE: $
		1253	CODE:
		1254	RETVAL = boolSV (api_is_ready (self));
		1255	OUTPUT:
		1256	RETVAL
		1257
		1258	int
1039	nready(...)	1259	nready (...)
1040	PROTOTYPE:	1260	PROTOTYPE:
1041	CODE:	1261	CODE:
1042	RETVAL = coro_nready;	1262	RETVAL = coro_nready;
1043	OUTPUT:	1263	OUTPUT:
1044	RETVAL	1264	RETVAL
1045		1265
		1266	MODULE = Coro::State PACKAGE = Coro::AIO
		1267
		1268	SV *
		1269	_get_state ()
		1270	CODE:
		1271	{
		1272	struct io_state *data;
		1273
		1274	RETVAL = newSV (sizeof (struct io_state));
		1275	data = (struct io_state *)SvPVX (RETVAL);
		1276	SvCUR_set (RETVAL, sizeof (struct io_state));
		1277	SvPOK_only (RETVAL);
		1278
		1279	data->errorno = errno;
		1280	data->laststype = PL_laststype;
		1281	data->laststatval = PL_laststatval;
		1282	data->statcache = PL_statcache;
		1283	}
		1284	OUTPUT:
		1285	RETVAL
		1286
1046	void	1287	void
1047	schedule(...)	1288	_set_state (char *data_)
1048	PROTOTYPE:	1289	PROTOTYPE: $
1049	ALIAS:
1050	cede = 1
1051	CODE:	1290	CODE:
1052	api_schedule (ix);	1291	{
		1292	struct io_state *data = (void *)data_;
1053		1293
		1294	errno = data->errorno;
		1295	PL_laststype = data->laststype;
		1296	PL_laststatval = data->laststatval;
		1297	PL_statcache = data->statcache;
		1298	}
		1299

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