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Comparing Coro/Coro/State.xs (file contents):
Revision 1.25 by root, Wed Aug 15 03:24:07 2001 UTC vs.
Revision 1.127 by root, Tue Dec 12 13:56:45 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 */	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
25		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
		87
26	/* The next macro should delcare 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]))	227
165	{	228	SvREFCNT_dec ((SV*)padlist);
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	}	229	}
		230	}
175		231
176	#if 0 /* return -ENOTUNDERSTOOD */	232	static int
177	/* Now that vars are all in place, clone nested closures. */	233	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		234	{
		235	AV *padlist;
		236	AV *av = (AV *)mg->mg_obj;
178		237
179	for (ix = fpad; ix > 0; ix--) {	238	/* casting is fun. */
180	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	239	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
181	if (namesv	240	free_padlist (padlist);
182	&& namesv != &PL_sv_undef	241
183	&& !(SvFLAGS(namesv) & SVf_FAKE)	242	SvREFCNT_dec (av);
184	&& *SvPVX(namesv) == '&'	243
185	&& CvCLONE(ppad[ix]))	244	return 0;
186	{	245	}
187	CV *kid = cv_clone((CV*)ppad[ix]);	246
188	SvREFCNT_dec(ppad[ix]);	247	#define PERL_MAGIC_coro PERL_MAGIC_ext
189	CvCLONE_on(kid);	248
190	SvPADMY_on(kid);	249	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
191	npad[ix] = (SV*)kid;	250
192	}	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
		257
		258	/* the next two functions merely cache the padlists */
		259	static void
		260	get_padlist (CV *cv)
		261	{
		262	MAGIC *mg = CORO_MAGIC (cv);
		263	AV *av;
		264
		265	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		266	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		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
		276	CvPADLIST (cv) = coro_clone_padlist (cv);
		277	#endif
		278	}
		279	}
		280
		281	static void
		282	put_padlist (CV *cv)
		283	{
		284	MAGIC *mg = CORO_MAGIC (cv);
		285	AV *av;
		286
		287	if (!mg)
		288	{
		289	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		290	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		291	mg->mg_virtual = &vtbl_coro;
		292	mg->mg_obj = (SV *)newAV ();
193	}	293	}
194	#endif
195		294
196	return newpadlist;	295	av = (AV *)mg->mg_obj;
197	}
198		296
199	#ifdef MAY_FLUSH	297	if (AvFILLp (av) >= AvMAX (av))
200	STATIC AV *	298	av_extend (av, AvMAX (av) + 1);
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		299
215	SvREFCNT_dec((SV*)padlist);	300	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
216	}
217	}	301	}
218	#endif
219
220	/* the next two functions merely cache the padlists */
221	STATIC void
222	get_padlist (CV *cv)
223	{
224	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
225
226	if (he && AvFILLp ((AV *)*he) >= 0)
227	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
228	else
229	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
230	}
231
232	STATIC void
233	put_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
236
237	if (SvTYPE (*he) != SVt_PVAV)
238	{
239	SvREFCNT_dec (*he);
240	*he = (SV *)newAV ();
241	}
242
243	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
244	}
245
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	{
255	HE *he;
256	AV *padlist;
257
258	while (!!(he = hv_iternext (hv)))
259	{
260	AV *av = (AV *)HeVAL(he);
261
262	/* casting is fun. */
263	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
264	free_padlist (padlist);
265	}
266	}
267
268	SvREFCNT_dec (hv);
269	}
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) SB load_state(aTHX_ (state)); SPAGAIN; SE
276	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
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	/* I have not the slightest idea of why av_reify is necessary */	402	#define VAR(name,type)c->name = PL_ ## name;
414	/* but if it's missing the defav contents magically get replaced sometimes */	403	# include "state.h"
415	if (c->defav)	404	#undef VAR
416	av_reify (c->defav);
417
418	c->dowarn = PL_dowarn;
419	c->in_eval = PL_in_eval;
420
421	c->curstackinfo = PL_curstackinfo;
422	c->curstack = PL_curstack;
423	c->mainstack = PL_mainstack;
424	c->stack_sp = PL_stack_sp;
425	c->op = PL_op;
426	c->curpad = PL_curpad;
427	c->stack_base = PL_stack_base;
428	c->stack_max = PL_stack_max;
429	c->tmps_stack = PL_tmps_stack;
430	c->tmps_floor = PL_tmps_floor;
431	c->tmps_ix = PL_tmps_ix;
432	c->tmps_max = PL_tmps_max;
433	c->markstack = PL_markstack;
434	c->markstack_ptr = PL_markstack_ptr;
435	c->markstack_max = PL_markstack_max;
436	c->scopestack = PL_scopestack;
437	c->scopestack_ix = PL_scopestack_ix;
438	c->scopestack_max = PL_scopestack_max;
439	c->savestack = PL_savestack;
440	c->savestack_ix = PL_savestack_ix;
441	c->savestack_max = PL_savestack_max;
442	c->retstack = PL_retstack;
443	c->retstack_ix = PL_retstack_ix;
444	c->retstack_max = PL_retstack_max;
445	c->curcop = PL_curcop;
446	c->top_env = PL_top_env;
447	}	405	}
448		406
449	/*	407	/*
450	* allocate various perl stacks. This is an exact copy	408	* allocate various perl stacks. This is an exact copy
451	* of perl.c:init_stacks, except that it uses less memory	409	* of perl.c:init_stacks, except that it uses less memory
452	* on the assumption that coroutines do not usually need	410	* on the (sometimes correct) assumption that coroutines do
453	* a lot of stackspace.	411	* not usually need a lot of stackspace.
454	*/	412	*/
455	STATIC void	413	#if PREFER_PERL_FUNCTIONS
		414	# define coro_init_stacks init_stacks
		415	#else
		416	static void
456	coro_init_stacks (pTHX)	417	coro_init_stacks ()
457	{	418	{
458	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
459	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
460	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
461	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
462		423
463	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
464	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
465	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
466		427
467	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
468	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
469	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
470	PL_tmps_max = 96;	431	PL_tmps_max = 128;
471		432
472	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
473	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
474	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
475		436
		437	#ifdef SET_MARK_OFFSET
476	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
		439	#endif
477		440
478	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
479	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
480	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
481		444
482	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
483	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
484	PL_savestack_max = 96;	447	PL_savestack_max = 64;
485		448
		449	#if !PERL_VERSION_ATLEAST (5,9,0)
486	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
487	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
488	PL_retstack_max = 8;	452	PL_retstack_max = 16;
		453	#endif
489	}	454	}
		455	#endif
490		456
491	/*	457	/*
492	* destroy the stacks, the callchain etc...	458	* destroy the stacks, the callchain etc...
493	* still there is a memleak of 128 bytes...
494	*/	459	*/
495	STATIC void	460	static void
496	destroy_stacks(pTHX)	461	coro_destroy_stacks ()
497	{	462	{
498	/* is this ugly, I ask? */	463	if (!IN_DESTRUCT)
499	while (PL_scopestack_ix)	464	{
500	LEAVE;	465	/* restore all saved variables and stuff */
		466	LEAVE_SCOPE (0);
		467	assert (PL_tmps_floor == -1);
501		468
502	/* sure it is, but more important: is it correct?? :/ */	469	/* free all temporaries */
503	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
504	FREETMPS;	470	FREETMPS;
		471	assert (PL_tmps_ix == -1);
		472
		473	POPSTACK_TO (PL_mainstack);
		474	}
505		475
506	while (PL_curstackinfo->si_next)	476	while (PL_curstackinfo->si_next)
507	PL_curstackinfo = PL_curstackinfo->si_next;	477	PL_curstackinfo = PL_curstackinfo->si_next;
508		478
509	while (PL_curstackinfo)	479	while (PL_curstackinfo)
510	{	480	{
511	PERL_SI *p = PL_curstackinfo->si_prev;	481	PERL_SI *p = PL_curstackinfo->si_prev;
512		482
513	{	483	if (!IN_DESTRUCT)
514	dSP;
515	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
516	PUTBACK; /* possibly superfluous */
517	}
518
519	if (PL_main_cv != Nullcv) /* don't during destruction. hack? */
520	dounwind(-1);
521
522	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
		485
523	Safefree(PL_curstackinfo->si_cxstack);	486	Safefree (PL_curstackinfo->si_cxstack);
524	Safefree(PL_curstackinfo);	487	Safefree (PL_curstackinfo);
525	PL_curstackinfo = p;	488	PL_curstackinfo = p;
526	}	489	}
527		490
528	Safefree(PL_tmps_stack);	491	Safefree (PL_tmps_stack);
529	Safefree(PL_markstack);	492	Safefree (PL_markstack);
530	Safefree(PL_scopestack);	493	Safefree (PL_scopestack);
531	Safefree(PL_savestack);	494	Safefree (PL_savestack);
		495	#if !PERL_VERSION_ATLEAST (5,9,0)
532	Safefree(PL_retstack);	496	Safefree (PL_retstack);
533	}
534
535	static void
536	allocate_stack (Coro__State ctx, int alloc)
537	{
538	coro_stack *stack;
539
540	New (0, stack, 1, coro_stack);
541
542	stack->refcnt = 1;
543	stack->usecnt = 1;
544	stack->gencnt = ctx->gencnt = 0;
545	if (alloc)
546	{
547	#ifdef HAVE_MMAP
548	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
549	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
550	if (stack->sptr == (void *)-1)
551	#endif	497	#endif
552	{
553	/*FIXME*//*D*//* reasonable stack size! */
554	stack->ssize = -4096 * sizeof (long);
555	New (0, stack->sptr, 4096, long);
556	}
557	}
558	else
559	stack->sptr = 0;
560
561	ctx->stack = stack;
562	}	498	}
563		499
564	static void	500	static void
565	deallocate_stack (Coro__State ctx)	501	setup_coro (struct coro *coro)
566	{
567	coro_stack *stack = ctx->stack;
568
569	ctx->stack = 0;
570
571	if (stack)
572	{
573	if (!--stack->refcnt)
574	{
575	#ifdef HAVE_MMAP
576	if (stack->ssize > 0 && stack->sptr)
577	munmap (stack->sptr, stack->ssize);
578	else
579	#else
580	Safefree (stack->sptr);
581	#endif
582	Safefree (stack);
583	}
584	else if (ctx->gencnt == stack->gencnt)
585	--stack->usecnt;
586	}
587	}
588
589	static void
590	setup_coro (void *arg)
591	{	502	{
592	/*	503	/*
593	* emulate part of the perl startup here.	504	* emulate part of the perl startup here.
594	*/	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	{
595	dSP;	552	dSP;
596	Coro__State ctx = (Coro__State)arg;	553	LOGOP myop;
597	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
598		554
599	coro_init_stacks (aTHX);	555	Zero (&myop, 1, LOGOP);
600	/*PL_curcop = 0;*/	556	myop.op_next = PL_op;
601	/*PL_in_eval = PL_in_eval;*/ /* inherit */	557	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
602	SvREFCNT_dec (GvAV (PL_defgv));
603	GvAV (PL_defgv) = ctx->args;
604		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);
605	SPAGAIN;	566	SPAGAIN;
606
607	if (ctx->stack)
608	{
609	ctx->cursp = 0;
610
611	PUSHMARK(SP);
612	PUTBACK;
613	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
614
615	if (SvTRUE (ERRSV))
616	croak (NULL);
617	else
618	croak ("FATAL: CCTXT coroutine returned!");
619	}
620	else
621	{
622	UNOP myop;
623
624	PL_op = (OP *)&myop;
625
626	Zero(&myop, 1, UNOP);
627	myop.op_next = Nullop;
628	myop.op_flags = OPf_WANT_VOID;
629
630	PUSHMARK(SP);
631	XPUSHs (sub_init);
632	/*
633	* the next line is slightly wrong, as PL_op->op_next
634	* is actually being executed so we skip the first op.
635	* that doesn't matter, though, since it is only
636	* pp_nextstate and we never return...
637	* ah yes, and I don't care anyways ;)
638	*/
639	PUTBACK;
640	PL_op = pp_entersub();
641	SPAGAIN;
642
643	ENTER; /* necessary e.g. for dounwind */
644	}
645	}	567	}
646		568
647	static void	569	static void
648	continue_coro (void *arg)	570	coro_run (void *arg)
649	{	571	{
		572	/* coro_run is the alternative tail of transfer(), so unlock here. */
		573	UNLOCK;
		574
650	/*	575	/*
651	* this is a _very_ stripped down perl interpreter ;)	576	* this is a _very_ stripped down perl interpreter ;)
652	*/	577	*/
653	Coro__State ctx = (Coro__State)arg;	578	PL_top_env = &PL_start_env;
654		579
655	/*FIXME*//* must set up top_env here */	580	/* inject call to cctx_init */
656	ctx->cursp = 0;	581	prepare_cctx ((coro_cctx *)arg);
657	PL_op = PL_op->op_next;
658	CALLRUNOPS(aTHX);
659		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);
660	abort ();	588	abort ();
661	}	589	}
662		590
663	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
664	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	703	transfer (struct coro *prev, struct coro *next)
665	{	704	{
666	dSP;
667	dSTACKLEVEL;	705	dSTACKLEVEL;
668		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	}
669	if (prev != next)	713	else if (prev != next)
670	{	714	{
671	if (next->mainstack)	715	coro_cctx *prev__cctx;
		716
		717	if (prev->flags & CF_NEW)
672	{	718	{
673	SAVE (prev, flags);	719	/* create a new empty context */
674	LOAD (next);	720	Newz (0, prev->cctx, 1, coro_cctx);
675		721	prev->cctx->inuse = 1;
676	/* mark this state as in-use */	722	prev->flags &= ~CF_NEW;
677	next->mainstack = 0;	723	prev->flags |= CF_RUNNING;
678	next->tmps_ix = -2;
679
680	/* stacklevel changed? if yes, grab the stack for us! */
681	if (flags & TRANSFER_SAVE_CCTXT)
682	{
683	if (!prev->stack)
684	allocate_stack (prev, 0);
685	else if (prev->cursp != stacklevel
686	&& prev->stack->usecnt > 1)
687	{
688	prev->gencnt = ++prev->stack->gencnt;
689	prev->stack->usecnt = 1;
690	}
691
692	/* has our stack been invalidated? */
693	if (next->stack && next->stack->gencnt != next->gencnt)
694	{
695	deallocate_stack (next);
696	allocate_stack (next, 1);
697	coro_create (&(next->stack->cctx),
698	continue_coro, (void *)next,
699	next->stack->sptr, labs (next->stack->ssize));
700	}
701
702	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
703	}
704
705	}	724	}
706	else if (next->tmps_ix == -2)	725
707	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	}
708	else	749	else
709	{	750	{
710	SAVE (prev, -1); /* first get rid of the old state */	751	/* coroutine already started */
711		752	save_perl (prev);
712	if (flags & TRANSFER_SAVE_CCTXT)	753	load_perl (next);
713	{
714	if (!prev->stack)
715	allocate_stack (prev, 0);
716
717	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
718	{
719	setup_coro (next);
720
721	prev->stack->refcnt++;
722	prev->stack->usecnt++;
723	next->stack = prev->stack;
724	next->gencnt = prev->gencnt;
725	}
726	else
727	{
728	allocate_stack (next, 1);
729	coro_create (&(next->stack->cctx),
730	setup_coro, (void *)next,
731	next->stack->sptr, labs (next->stack->ssize));
732	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
733	}
734	}
735	else
736	setup_coro (next);
737	}	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;
738	}	787	}
739
740	next->cursp = stacklevel;
741	}	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)
		804	{
		805	struct coro temp;
		806	Zero (&temp, 1, struct coro);
		807	temp.save = CORO_SAVE_ALL;
		808
		809	if (coro->flags & CF_RUNNING)
		810	croak ("FATAL: tried to destroy currently running coroutine");
		811
		812	save_perl (&temp);
		813	load_perl (coro);
		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);
		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	};
742		858
743	static struct coro *	859	static struct coro *
744	sv_to_coro (SV *arg, const char *funcname, const char *varname)	860	SvSTATE (SV *coro)
745	{	861	{
746	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	862	HV *stash;
747	{	863	MAGIC *mg;
748	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);
749		864
750	if (!he)	865	if (SvROK (coro))
751	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);	866	coro = SvRV (coro);
752		867
753	arg = HeVAL(he);	868	stash = SvSTASH (coro);
		869	if (stash != coro_stash && stash != coro_state_stash)
		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");
754	}	874	}
755
756	/* must also be changed inside Coro::Cont::yield */
757	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
758	return (struct coro *) SvIV((SV*)SvRV(arg));
759	else
760	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);
761	}
762		875
		876	mg = SvMAGIC (coro);
		877	assert (mg->mg_type == PERL_MAGIC_ext);
		878	return (struct coro *)mg->mg_ptr;
		879	}
		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
763	static void	897	static int
764	api_transfer(pTHX_ SV *prev, SV *next, int flags)	898	api_save (SV *coro_sv, int new_save)
765	{	899	{
766	transfer(aTHX_ sv_to_coro (prev, "Coro::transfer", "prev"),	900	struct coro *coro = SvSTATE (coro_sv);
767	sv_to_coro (next, "Coro::transfer", "next"),	901	int old_save = coro->save;
768	flags);	902
		903	if (new_save >= 0)
		904	coro->save = new_save;
		905
		906	return old_save;
769	}	907	}
770		908
771	/** Coro ********************************************************************/	909	/** Coro ********************************************************************/
772		910
773	#define PRIO_MAX 3	911	#define PRIO_MAX 3
…		…
776	#define PRIO_LOW -1	914	#define PRIO_LOW -1
777	#define PRIO_IDLE -3	915	#define PRIO_IDLE -3
778	#define PRIO_MIN -4	916	#define PRIO_MIN -4
779		917
780	/* for Coro.pm */	918	/* for Coro.pm */
781	static GV *coro_current, *coro_idle;	919	static SV *coro_current;
782	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	920	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
783	static int coro_nready;	921	static int coro_nready;
784		922
785	static void	923	static void
786	coro_enq (SV *sv)	924	coro_enq (SV *coro_sv)
787	{	925	{
788	if (SvROK (sv))	926	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
789	{
790	SV *hv = SvRV (sv);
791	if (SvTYPE (hv) == SVt_PVHV)
792	{
793	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
794	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
795
796	prio = prio > PRIO_MAX ? PRIO_MAX
797	: prio < PRIO_MIN ? PRIO_MIN
798	: prio;
799
800	av_push (coro_ready [prio - PRIO_MIN], sv);
801	coro_nready++;	927	coro_nready++;
802
803	return;
804	}
805	}
806
807	croak ("Coro::ready tried to enqueue something that is not a coroutine");
808	}	928	}
809		929
810	static SV *	930	static SV *
811	coro_deq (int min_prio)	931	coro_deq (int min_prio)
812	{	932	{
…		…
815	min_prio -= PRIO_MIN;	935	min_prio -= PRIO_MIN;
816	if (min_prio < 0)	936	if (min_prio < 0)
817	min_prio = 0;	937	min_prio = 0;
818		938
819	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	939	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
820	if (av_len (coro_ready[prio]) >= 0)	940	if (AvFILLp (coro_ready [prio]) >= 0)
821	{	941	{
822	coro_nready--;	942	coro_nready--;
823	return av_shift (coro_ready[prio]);	943	return av_shift (coro_ready [prio]);
824	}	944	}
825		945
826	return 0;	946	return 0;
827	}	947	}
828		948
829	static void	949	static int
830	api_ready (SV *coro)	950	api_ready (SV *coro_sv)
831	{	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	#if 0 /* this is actually harmless */
		963	if (coro->flags & CF_RUNNING)
		964	croak ("Coro::ready called on currently running coroutine");
		965	#endif
		966
		967	coro->flags |= CF_READY;
		968
		969	LOCK;
832	coro_enq (SvREFCNT_inc (coro));	970	coro_enq (SvREFCNT_inc (coro_sv));
833	}	971	UNLOCK;
834		972
		973	return 1;
		974	}
		975
835	static void	976	static int
836	api_schedule (int cede)	977	api_is_ready (SV *coro_sv)
		978	{
		979	return !!SvSTATE (coro_sv)->flags & CF_READY;
		980	}
		981
		982	static void
		983	prepare_schedule (struct transfer_args *ta)
837	{	984	{
838	SV *prev, *next;	985	SV *prev, *next;
839		986
840	prev = GvSV (coro_current);	987	for (;;)
841		988	{
842	if (cede)	989	LOCK;
843	coro_enq (SvREFCNT_inc (prev));
844
845	next = coro_deq (PRIO_MIN);	990	next = coro_deq (PRIO_MIN);
		991	UNLOCK;
846		992
847	if (!next)	993	if (next)
848	next = SvREFCNT_inc (GvSV (coro_idle));	994	break;
849		995
850	GvSV (coro_current) = SvREFCNT_inc (next);	996	{
851	transfer (sv_to_coro (prev, "Coro::schedule", "current coroutine"),	997	dSP;
852	sv_to_coro (next, "Coro::schedule", "next coroutine"),	998
853	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	999	ENTER;
854	SvREFCNT_dec (next);	1000	SAVETMPS;
855	SvREFCNT_dec (prev);	1001
		1002	PUSHMARK (SP);
		1003	PUTBACK;
		1004	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1005
		1006	FREETMPS;
		1007	LEAVE;
		1008	}
		1009	}
		1010
		1011	prev = SvRV (coro_current);
		1012	SvRV_set (coro_current, next);
		1013
		1014	/* free this only after the transfer */
		1015	LOCK;
		1016	free_coro_mortal ();
		1017	UNLOCK;
		1018	coro_mortal = prev;
		1019
		1020	assert (!SvROK(prev));//D
		1021	assert (!SvROK(next));//D
		1022
		1023	ta->prev = SvSTATE (prev);
		1024	ta->next = SvSTATE (next);
		1025
		1026	assert (ta->next->flags & CF_READY);
		1027	ta->next->flags &= ~CF_READY;
		1028	}
		1029
		1030	static void
		1031	prepare_cede (struct transfer_args *ta)
		1032	{
		1033	api_ready (coro_current);
		1034
		1035	prepare_schedule (ta);
		1036	}
		1037
		1038	static void
		1039	api_schedule (void)
		1040	{
		1041	struct transfer_args ta;
		1042
		1043	prepare_schedule (&ta);
		1044	TRANSFER (ta);
		1045	}
		1046
		1047	static void
		1048	api_cede (void)
		1049	{
		1050	struct transfer_args ta;
		1051
		1052	prepare_cede (&ta);
		1053	TRANSFER (ta);
856	}	1054	}
857		1055
858	MODULE = Coro::State PACKAGE = Coro::State	1056	MODULE = Coro::State PACKAGE = Coro::State
859		1057
860	PROTOTYPES: ENABLE	1058	PROTOTYPES: DISABLE
861		1059
862	BOOT:	1060	BOOT:
863	{ /* {} necessary for stoopid perl-5.6.x */	1061	{
864	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1062	#ifdef USE_ITHREADS
865	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1063	MUTEX_INIT (&coro_mutex);
		1064	#endif
		1065	BOOT_PAGESIZE;
		1066
866	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1067	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
867		1068
868	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1069	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
869	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1070	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
870	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1071	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1072	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
871	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1073	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
872
873	if (!padlist_cache)
874	padlist_cache = newHV ();
875		1074
876	main_mainstack = PL_mainstack;	1075	main_mainstack = PL_mainstack;
877		1076
878	{
879	SV *sv = perl_get_sv("Coro::API", 1);
880
881	coroapi.ver = CORO_API_VERSION - 1;	1077	coroapi.ver = CORO_API_VERSION;
882	coroapi.transfer = api_transfer;	1078	coroapi.transfer = api_transfer;
883	coroapi.schedule = api_schedule;
884	coroapi.ready = api_ready;
885	coroapi.nready = &coro_nready;
886		1079
887	GCoroAPI = &coroapi;	1080	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
888	sv_setiv(sv, (IV)&coroapi);
889	SvREADONLY_on(sv);
890	}
891	}	1081	}
892		1082
893	Coro::State	1083	SV *
894	_newprocess(args)	1084	new (char *klass, ...)
895	SV * args
896	PROTOTYPE: $
897	CODE:	1085	CODE:
898	Coro__State coro;	1086	{
		1087	struct coro *coro;
		1088	HV *hv;
		1089	int i;
899		1090
900	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
901	croak ("Coro::State::_newprocess expects an arrayref");
902
903	New (0, coro, 1, struct coro);	1091	Newz (0, coro, 1, struct coro);
		1092	coro->args = newAV ();
		1093	coro->save = CORO_SAVE_ALL;
		1094	coro->flags = CF_NEW;
904		1095
905	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1096	hv = newHV ();
906	coro->mainstack = 0; /* actual work is done inside transfer */	1097	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
907	coro->stack = 0;	1098	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
908		1099
909	RETVAL = coro;	1100	for (i = 1; i < items; i++)
		1101	av_push (coro->args, newSVsv (ST (i)));
		1102	}
910	OUTPUT:	1103	OUTPUT:
911	RETVAL	1104	RETVAL
912		1105
		1106	int
		1107	save (SV *coro, int new_save = -1)
		1108	CODE:
		1109	RETVAL = api_save (coro, new_save);
		1110	OUTPUT:
		1111	RETVAL
		1112
913	void	1113	void
914	transfer(prev, next, flags)	1114	_set_stacklevel (...)
915	Coro::State_or_hashref prev	1115	ALIAS:
916	Coro::State_or_hashref next	1116	Coro::State::transfer = 1
917	int flags	1117	Coro::schedule = 2
918	PROTOTYPE: @	1118	Coro::cede = 3
919	CODE:	1119	CODE:
920	PUTBACK;	1120	{
921	transfer (aTHX_ prev, next, flags);	1121	struct transfer_args ta;
922	SPAGAIN;	1122
		1123	switch (ix)
		1124	{
		1125	case 0:
		1126	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1127	ta.next = 0;
		1128	break;
		1129
		1130	case 1:
		1131	if (items != 2)
		1132	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1133
		1134	prepare_transfer (&ta, ST (0), ST (1));
		1135	break;
		1136
		1137	case 2:
		1138	prepare_schedule (&ta);
		1139	break;
		1140
		1141	case 3:
		1142	prepare_cede (&ta);
		1143	break;
		1144	}
		1145
		1146	TRANSFER (ta);
		1147	}
923		1148
924	void	1149	void
925	DESTROY(coro)	1150	_clone_state_from (SV *dst, SV *src)
926	Coro::State coro	1151	CODE:
927	CODE:	1152	{
		1153	struct coro *coro_src = SvSTATE (src);
928		1154
929	if (coro->mainstack && coro->mainstack != main_mainstack)	1155	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
930	{
931	struct coro temp;
932		1156
933	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1157	++coro_src->refcnt;
934	LOAD(aTHX_ coro);	1158	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
935		1159	}
936	destroy_stacks (aTHX);
937
938	LOAD((&temp)); /* this will get rid of defsv etc.. */
939
940	coro->mainstack = 0;
941	}
942
943	deallocate_stack (coro);
944
945	Safefree (coro);
946		1160
947	void	1161	void
948	flush()
949	CODE:
950	#ifdef MAY_FLUSH
951	flush_padlist_cache ();
952	#endif
953
954	void
955	_exit(code)	1162	_exit (code)
956	int code	1163	int code
957	PROTOTYPE: $	1164	PROTOTYPE: $
958	CODE:	1165	CODE:
959	#if defined(__GLIBC__) || _POSIX_C_SOURCE
960	_exit (code);	1166	_exit (code);
961	#else
962	signal (SIGTERM, SIG_DFL);
963	raise (SIGTERM);
964	exit (code);
965	#endif
966		1167
967	MODULE = Coro::State PACKAGE = Coro::Cont	1168	int
		1169	cctx_count ()
		1170	CODE:
		1171	RETVAL = cctx_count;
		1172	OUTPUT:
		1173	RETVAL
968		1174
969	# this is slightly dirty (should expose a c-level api)	1175	int
970		1176	cctx_idle ()
971	void	1177	CODE:
972	yield(...)	1178	RETVAL = cctx_idle;
973	PROTOTYPE: @	1179	OUTPUT:
974	CODE:	1180	RETVAL
975	static SV *returnstk;
976	SV *sv;
977	AV *defav = GvAV (PL_defgv);
978	struct coro *prev, *next;
979
980	if (!returnstk)
981	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
982
983	/* set up @_ -- ugly */
984	av_clear (defav);
985	av_fill (defav, items - 1);
986	while (items--)
987	av_store (defav, items, SvREFCNT_inc (ST(items)));
988
989	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
990	sv = av_pop ((AV *)SvRV (returnstk));
991	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
992	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
993	SvREFCNT_dec (sv);
994
995	transfer(aTHX_ prev, next, 0);
996		1181
997	MODULE = Coro::State PACKAGE = Coro	1182	MODULE = Coro::State PACKAGE = Coro
998		1183
999	# this is slightly dirty (should expose a c-level api)
1000
1001	BOOT:	1184	BOOT:
1002	{	1185	{
1003	int i;	1186	int i;
		1187
1004	HV *stash = gv_stashpv ("Coro", TRUE);	1188	coro_stash = gv_stashpv ("Coro", TRUE);
1005		1189
1006	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1190	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1007	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1191	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1008	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1192	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1009	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1193	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1010	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1194	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1011	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1195	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1012		1196
1013	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1197	coro_current = get_sv ("Coro::current", FALSE);
1014	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1198	SvREADONLY_on (coro_current);
1015		1199
1016	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1200	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1017	coro_ready[i] = newAV ();	1201	coro_ready[i] = newAV ();
		1202
		1203	{
		1204	SV *sv = perl_get_sv("Coro::API", 1);
		1205
		1206	coroapi.schedule = api_schedule;
		1207	coroapi.save = api_save;
		1208	coroapi.cede = api_cede;
		1209	coroapi.ready = api_ready;
		1210	coroapi.is_ready = api_is_ready;
		1211	coroapi.nready = &coro_nready;
		1212	coroapi.current = coro_current;
		1213
		1214	GCoroAPI = &coroapi;
		1215	sv_setiv (sv, (IV)&coroapi);
		1216	SvREADONLY_on (sv);
		1217	}
1018	}	1218	}
1019		1219
1020	void	1220	void
1021	ready(self)	1221	_set_current (SV *current)
1022	SV * self	1222	PROTOTYPE: $
1023	CODE:	1223	CODE:
1024	api_ready (self);	1224	SvREFCNT_dec (SvRV (coro_current));
		1225	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1025		1226
1026	int	1227	int
		1228	prio (Coro::State coro, int newprio = 0)
		1229	ALIAS:
		1230	nice = 1
		1231	CODE:
		1232	{
		1233	RETVAL = coro->prio;
		1234
		1235	if (items > 1)
		1236	{
		1237	if (ix)
		1238	newprio += coro->prio;
		1239
		1240	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1241	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1242
		1243	coro->prio = newprio;
		1244	}
		1245	}
		1246
		1247	SV *
		1248	ready (SV *self)
		1249	PROTOTYPE: $
		1250	CODE:
		1251	RETVAL = boolSV (api_ready (self));
		1252	OUTPUT:
		1253	RETVAL
		1254
		1255	SV *
		1256	is_ready (SV *self)
		1257	PROTOTYPE: $
		1258	CODE:
		1259	RETVAL = boolSV (api_is_ready (self));
		1260	OUTPUT:
		1261	RETVAL
		1262
		1263	int
1027	nready(...)	1264	nready (...)
1028	PROTOTYPE:	1265	PROTOTYPE:
1029	CODE:	1266	CODE:
1030	RETVAL = coro_nready;	1267	RETVAL = coro_nready;
1031	OUTPUT:	1268	OUTPUT:
1032	RETVAL	1269	RETVAL
1033		1270
		1271	MODULE = Coro::State PACKAGE = Coro::AIO
		1272
		1273	SV *
		1274	_get_state ()
		1275	CODE:
		1276	{
		1277	struct io_state *data;
		1278
		1279	RETVAL = newSV (sizeof (struct io_state));
		1280	data = (struct io_state *)SvPVX (RETVAL);
		1281	SvCUR_set (RETVAL, sizeof (struct io_state));
		1282	SvPOK_only (RETVAL);
		1283
		1284	data->errorno = errno;
		1285	data->laststype = PL_laststype;
		1286	data->laststatval = PL_laststatval;
		1287	data->statcache = PL_statcache;
		1288	}
		1289	OUTPUT:
		1290	RETVAL
		1291
1034	void	1292	void
1035	schedule(...)	1293	_set_state (char *data_)
1036	PROTOTYPE:	1294	PROTOTYPE: $
1037	ALIAS:
1038	cede = 1
1039	CODE:	1295	CODE:
1040	api_schedule (ix);	1296	{
		1297	struct io_state *data = (void *)data_;
1041		1298
		1299	errno = data->errorno;
		1300	PL_laststype = data->laststype;
		1301	PL_laststatval = data->laststatval;
		1302	PL_statcache = data->statcache;
		1303	}
		1304

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