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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.52 by pcg, Sun Nov 30 22:49:25 2003 UTC vs.
Revision 1.124 by root, Tue Dec 5 12:50:04 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 "patchlevel.h"	7	#include "patchlevel.h"
6		8
7	#if PATCHLEVEL < 6	9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
8	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
9	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
10	# endif	25	# endif
11	# ifndef call_sv	26	# ifndef call_sv
12	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
23	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
24	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
25	# endif	40	# endif
26	#endif	41	#endif
27		42
28	#include "libcoro/coro.c"
29
30	#include <signal.h>	43	#include <stdio.h>
		44	#include <errno.h>
		45	#include <assert.h>
		46
		47	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		48	# undef STACKGUARD
		49	#endif
		50
		51	#ifndef STACKGUARD
		52	# define STACKGUARD 0
		53	#endif
31		54
32	#ifdef HAVE_MMAP	55	#ifdef HAVE_MMAP
33	# include <unistd.h>	56	# include <unistd.h>
34	# include <sys/mman.h>	57	# include <sys/mman.h>
35	# ifndef MAP_ANONYMOUS	58	# ifndef MAP_ANONYMOUS
…		…
37	# define MAP_ANONYMOUS MAP_ANON	60	# define MAP_ANONYMOUS MAP_ANON
38	# else	61	# else
39	# undef HAVE_MMAP	62	# undef HAVE_MMAP
40	# endif	63	# endif
41	# endif	64	# endif
		65	# include <limits.h>
		66	# ifndef PAGESIZE
		67	# define PAGESIZE pagesize
		68	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		69	static long pagesize;
		70	# else
		71	# define BOOT_PAGESIZE (void)0
42	#endif	72	# endif
43		73	#else
44	#define SUB_INIT "Coro::State::initialize"	74	# define PAGESIZE 0
45	#define UCORO_STATE "_coro_state"	75	# define BOOT_PAGESIZE (void)0
		76	#endif
46		77
47	/* The next macro should declare a variable stacklevel that contains and approximation	78	/* The next macro should declare a variable stacklevel that contains and approximation
48	* to the current C stack pointer. Its property is that it changes with each call	79	* to the current C stack pointer. Its property is that it changes with each call
49	* and should be unique. */	80	* and should be unique. */
		81	#define dSTACKLEVEL int stacklevel
50	#define dSTACKLEVEL void *stacklevel = &stacklevel	82	#define STACKLEVEL ((void *)&stacklevel)
51		83
52	#define IN_DESTRUCT (PL_main_cv == Nullcv)	84	#define IN_DESTRUCT (PL_main_cv == Nullcv)
53		85
54	#define labs(l) ((l) >= 0 ? (l) : -(l))	86	#if __GNUC__ >= 3
		87	# define attribute(x) __attribute__(x)
		88	#else
		89	# define attribute(x)
		90	#endif
		91
		92	#define NOINLINE attribute ((noinline))
55		93
56	#include "CoroAPI.h"	94	#include "CoroAPI.h"
57		95
		96	#ifdef USE_ITHREADS
		97	static perl_mutex coro_mutex;
		98	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		99	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		100	#else
		101	# define LOCK (void)0
		102	# define UNLOCK (void)0
		103	#endif
		104
		105	struct io_state
		106	{
		107	int errorno;
		108	I32 laststype;
		109	int laststatval;
		110	Stat_t statcache;
		111	};
		112
58	static struct CoroAPI coroapi;	113	static struct CoroAPI coroapi;
		114	static AV *main_mainstack; /* used to differentiate between $main and others */
		115	static HV *coro_state_stash, *coro_stash;
		116	static SV *coro_mortal; /* will be freed after next transfer */
59		117
60	/* this is actually not only the c stack but also c registers etc... */	118	static struct coro_cctx *cctx_first;
		119	static int cctx_count, cctx_idle;
		120
		121	/* this is a structure representing a c-level coroutine */
61	typedef struct {	122	typedef struct coro_cctx {
62	int refcnt; /* pointer reference counter */	123	struct coro_cctx *next;
63	int usecnt; /* shared by how many coroutines */
64	int gencnt; /* generation counter */
65		124
66	coro_context cctx;	125	/* the stack */
67
68	void *sptr;	126	void *sptr;
69	long ssize; /* positive == mmap, otherwise malloc */	127	long ssize; /* positive == mmap, otherwise malloc */
70	} coro_stack;
71		128
		129	/* cpu state */
		130	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		131	JMPENV *top_env;
		132	coro_context cctx;
		133
		134	int inuse;
		135
		136	#if USE_VALGRIND
		137	int valgrind_id;
		138	#endif
		139	} coro_cctx;
		140
		141	enum {
		142	CF_RUNNING = 0x0001, /* coroutine is running */
		143	CF_READY = 0x0002, /* coroutine is ready */
		144	CF_NEW = 0x0004, /* ahs never been switched to */
		145	};
		146
		147	/* this is a structure representing a perl-level coroutine */
72	struct coro {	148	struct coro {
73	/* the top-level JMPENV for each coroutine, needed to catch dies. */	149	/* the c coroutine allocated to this perl coroutine, if any */
74	JMPENV start_env;	150	coro_cctx *cctx;
75
76	/* the optional C context */
77	coro_stack *stack;
78	void *cursp;
79	int gencnt;
80
81	/* optionally saved, might be zero */
82	AV *defav;
83	SV *defsv;
84	SV *errsv;
85
86	/* saved global state not related to stacks */
87	U8 dowarn;
88	I32 in_eval;
89
90	/* the stacks and related info (callchain etc..) */
91	PERL_SI *curstackinfo;
92	AV *curstack;
93	AV *mainstack;
94	SV **stack_sp;
95	OP *op;
96	SV **curpad;
97	AV *comppad;
98	SV **stack_base;
99	SV **stack_max;
100	SV **tmps_stack;
101	I32 tmps_floor;
102	I32 tmps_ix;
103	I32 tmps_max;
104	I32 *markstack;
105	I32 *markstack_ptr;
106	I32 *markstack_max;
107	I32 *scopestack;
108	I32 scopestack_ix;
109	I32 scopestack_max;
110	ANY *savestack;
111	I32 savestack_ix;
112	I32 savestack_max;
113	OP **retstack;
114	I32 retstack_ix;
115	I32 retstack_max;
116	COP *curcop;
117	JMPENV *top_env;
118		151
119	/* data associated with this coroutine (initial args) */	152	/* data associated with this coroutine (initial args) */
120	AV *args;	153	AV *args;
		154	int refcnt;
		155	int save; /* CORO_SAVE flags */
		156	int flags; /* CF_ flags */
		157
		158	/* optionally saved, might be zero */
		159	AV *defav; /* @_ */
		160	SV *defsv; /* $_ */
		161	SV *errsv; /* $@ */
		162	SV *irssv; /* $/ */
		163	SV *irssv_sv; /* real $/ cache */
		164
		165	#define VAR(name,type) type name;
		166	# include "state.h"
		167	#undef VAR
		168
		169	/* coro process data */
		170	int prio;
121	};	171	};
122		172
123	typedef struct coro *Coro__State;	173	typedef struct coro *Coro__State;
124	typedef struct coro *Coro__State_or_hashref;	174	typedef struct coro *Coro__State_or_hashref;
125		175
126	static AV *main_mainstack; /* used to differentiate between $main and others */	176	static AV *
127	static HV *coro_state_stash;	177	coro_clone_padlist (CV *cv)
128	static SV *ucoro_state_sv;
129	static U32 ucoro_state_hash;
130	static HV *padlist_cache;
131	static SV *coro_mortal; /* will be freed after next transfer */
132
133	/* mostly copied from op.c:cv_clone2 */
134	STATIC AV *
135	clone_padlist (AV *protopadlist)
136	{	178	{
137	AV *av;	179	AV *padlist = CvPADLIST (cv);
138	I32 ix;
139	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
140	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
141	SV **pname = AvARRAY (protopad_name);
142	SV **ppad = AvARRAY (protopad);
143	I32 fname = AvFILLp (protopad_name);
144	I32 fpad = AvFILLp (protopad);
145	AV *newpadlist, *newpad_name, *newpad;	180	AV *newpadlist, *newpad;
146	SV **npad;
147
148	newpad_name = newAV ();
149	for (ix = fname; ix >= 0; ix--)
150	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
151
152	newpad = newAV ();
153	av_fill (newpad, AvFILLp (protopad));
154	npad = AvARRAY (newpad);
155		181
156	newpadlist = newAV ();	182	newpadlist = newAV ();
157	AvREAL_off (newpadlist);	183	AvREAL_off (newpadlist);
158	av_store (newpadlist, 0, (SV *) newpad_name);	184	#if PERL_VERSION_ATLEAST (5,9,0)
		185	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		186	#else
		187	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		188	#endif
		189	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		190	--AvFILLp (padlist);
		191
		192	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
159	av_store (newpadlist, 1, (SV *) newpad);	193	av_store (newpadlist, 1, (SV *)newpad);
160
161	av = newAV (); /* will be @_ */
162	av_extend (av, 0);
163	av_store (newpad, 0, (SV *) av);
164	AvFLAGS (av) = AVf_REIFY;
165
166	for (ix = fpad; ix > 0; ix--)
167	{
168	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
169	if (namesv && namesv != &PL_sv_undef)
170	{
171	char *name = SvPVX (namesv); /* XXX */
172	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
173	{ /* lexical from outside? */
174	npad[ix] = SvREFCNT_inc (ppad[ix]);
175	}
176	else
177	{ /* our own lexical */
178	SV *sv;
179	if (*name == '&')
180	sv = SvREFCNT_inc (ppad[ix]);
181	else if (*name == '@')
182	sv = (SV *) newAV ();
183	else if (*name == '%')
184	sv = (SV *) newHV ();
185	else
186	sv = NEWSV (0, 0);
187	#ifdef SvPADBUSY
188	if (!SvPADBUSY (sv))
189	#endif
190	SvPADMY_on (sv);
191	npad[ix] = sv;
192	}
193	}
194	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
195	{
196	npad[ix] = SvREFCNT_inc (ppad[ix]);
197	}
198	else
199	{
200	SV *sv = NEWSV (0, 0);
201	SvPADTMP_on (sv);
202	npad[ix] = sv;
203	}
204	}
205
206	#if 0 /* return -ENOTUNDERSTOOD */
207	/* Now that vars are all in place, clone nested closures. */
208
209	for (ix = fpad; ix > 0; ix--) {
210	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
211	if (namesv
212	&& namesv != &PL_sv_undef
213	&& !(SvFLAGS(namesv) & SVf_FAKE)
214	&& *SvPVX(namesv) == '&'
215	&& CvCLONE(ppad[ix]))
216	{
217	CV *kid = cv_clone((CV*)ppad[ix]);
218	SvREFCNT_dec(ppad[ix]);
219	CvCLONE_on(kid);
220	SvPADMY_on(kid);
221	npad[ix] = (SV*)kid;
222	}
223	}
224	#endif
225		194
226	return newpadlist;	195	return newpadlist;
227	}	196	}
228		197
229	STATIC void	198	static void
230	free_padlist (AV *padlist)	199	free_padlist (AV *padlist)
231	{	200	{
232	/* may be during global destruction */	201	/* may be during global destruction */
233	if (SvREFCNT (padlist))	202	if (SvREFCNT (padlist))
234	{	203	{
…		…
248		217
249	SvREFCNT_dec ((SV*)padlist);	218	SvREFCNT_dec ((SV*)padlist);
250	}	219	}
251	}	220	}
252		221
253	STATIC int	222	static int
254	coro_cv_free (SV *sv, MAGIC *mg)	223	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
255	{	224	{
256	AV *padlist;	225	AV *padlist;
257	AV *av = (AV *)mg->mg_obj;	226	AV *av = (AV *)mg->mg_obj;
258		227
259	/* casting is fun. */	228	/* casting is fun. */
260	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	229	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
261	free_padlist (padlist);	230	free_padlist (padlist);
		231
		232	SvREFCNT_dec (av);
		233
		234	return 0;
262	}	235	}
263		236
264	#define PERL_MAGIC_coro PERL_MAGIC_ext	237	#define PERL_MAGIC_coro PERL_MAGIC_ext
265		238
266	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	239	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
267		240
		241	#define CORO_MAGIC(cv) \
		242	SvMAGIC (cv) \
		243	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		244	? SvMAGIC (cv) \
		245	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		246	: 0
		247
268	/* the next two functions merely cache the padlists */	248	/* the next two functions merely cache the padlists */
269	STATIC void	249	static void
270	get_padlist (CV *cv)	250	get_padlist (CV *cv)
271	{	251	{
272	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	252	MAGIC *mg = CORO_MAGIC (cv);
		253	AV *av;
273		254
274	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	255	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
275	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	256	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
276	else	257	else
		258	{
		259	#if 0
		260	/* this is probably cleaner, but also slower? */
		261	CV *cp = Perl_cv_clone (cv);
		262	CvPADLIST (cv) = CvPADLIST (cp);
		263	CvPADLIST (cp) = 0;
		264	SvREFCNT_dec (cp);
		265	#else
277	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));	266	CvPADLIST (cv) = coro_clone_padlist (cv);
		267	#endif
		268	}
278	}	269	}
279		270
280	STATIC void	271	static void
281	put_padlist (CV *cv)	272	put_padlist (CV *cv)
282	{	273	{
283	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	274	MAGIC *mg = CORO_MAGIC (cv);
		275	AV *av;
284		276
285	if (!mg)	277	if (!mg)
286	{	278	{
287	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	279	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
288	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	280	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
289	mg->mg_virtual = &vtbl_coro;	281	mg->mg_virtual = &vtbl_coro;
290	mg->mg_obj = (SV *)newAV ();	282	mg->mg_obj = (SV *)newAV ();
291	}	283	}
292		284
293	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	285	av = (AV *)mg->mg_obj;
		286
		287	if (AvFILLp (av) >= AvMAX (av))
		288	av_extend (av, AvMAX (av) + 1);
		289
		290	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
294	}	291	}
295		292
296	#define SB do {	293	#define SB do {
297	#define SE } while (0)	294	#define SE } while (0)
298		295
299	#define LOAD(state) load_state(aTHX_ (state));
300	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
301
302	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	296	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
303		297
304	static void	298	static void
305	load_state(pTHX_ Coro__State c)	299	load_perl (Coro__State c)
306	{	300	{
307	PL_dowarn = c->dowarn;	301	#define VAR(name,type) PL_ ## name = c->name;
308	PL_in_eval = c->in_eval;	302	# include "state.h"
309		303	#undef VAR
310	PL_curstackinfo = c->curstackinfo;
311	PL_curstack = c->curstack;
312	PL_mainstack = c->mainstack;
313	PL_stack_sp = c->stack_sp;
314	PL_op = c->op;
315	PL_curpad = c->curpad;
316	PL_comppad = c->comppad;
317	PL_stack_base = c->stack_base;
318	PL_stack_max = c->stack_max;
319	PL_tmps_stack = c->tmps_stack;
320	PL_tmps_floor = c->tmps_floor;
321	PL_tmps_ix = c->tmps_ix;
322	PL_tmps_max = c->tmps_max;
323	PL_markstack = c->markstack;
324	PL_markstack_ptr = c->markstack_ptr;
325	PL_markstack_max = c->markstack_max;
326	PL_scopestack = c->scopestack;
327	PL_scopestack_ix = c->scopestack_ix;
328	PL_scopestack_max = c->scopestack_max;
329	PL_savestack = c->savestack;
330	PL_savestack_ix = c->savestack_ix;
331	PL_savestack_max = c->savestack_max;
332	PL_retstack = c->retstack;
333	PL_retstack_ix = c->retstack_ix;
334	PL_retstack_max = c->retstack_max;
335	PL_curcop = c->curcop;
336	PL_top_env = c->top_env;
337		304
338	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	305	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
339	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	306	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
340	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	307	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		308	if (c->irssv)
		309	{
		310	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		311	SvREFCNT_dec (c->irssv);
		312	else
		313	{
		314	REPLACE_SV (PL_rs, c->irssv);
		315	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		316	sv_setsv (c->irssv_sv, PL_rs);
		317	}
		318	}
341		319
342	{	320	{
343	dSP;	321	dSP;
344	CV *cv;	322	CV *cv;
345		323
346	/* now do the ugly restore mess */	324	/* now do the ugly restore mess */
347	while ((cv = (CV *)POPs))	325	while ((cv = (CV *)POPs))
348	{	326	{
349	AV *padlist = (AV *)POPs;
350
351	if (padlist)
352	{
353	put_padlist (cv); /* mark this padlist as available */	327	put_padlist (cv); /* mark this padlist as available */
354	CvPADLIST(cv) = padlist;	328	CvDEPTH (cv) = PTR2IV (POPs);
355	#ifdef USE_THREADS	329	CvPADLIST (cv) = (AV *)POPs;
356	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
357	#endif
358	}
359
360	++CvDEPTH(cv);
361	}	330	}
362		331
363	PUTBACK;	332	PUTBACK;
364	}	333	}
365	}	334	}
366		335
367	static void	336	static void
368	save_state(pTHX_ Coro__State c, int flags)	337	save_perl (Coro__State c)
369	{	338	{
370	{	339	{
371	dSP;	340	dSP;
372	I32 cxix = cxstack_ix;	341	I32 cxix = cxstack_ix;
373	PERL_CONTEXT *ccstk = cxstack;	342	PERL_CONTEXT *ccstk = cxstack;
…		…
384	{	353	{
385	while (cxix >= 0)	354	while (cxix >= 0)
386	{	355	{
387	PERL_CONTEXT *cx = &ccstk[cxix--];	356	PERL_CONTEXT *cx = &ccstk[cxix--];
388		357
389	if (CxTYPE(cx) == CXt_SUB)	358	if (CxTYPE (cx) == CXt_SUB)
390	{	359	{
391	CV *cv = cx->blk_sub.cv;	360	CV *cv = cx->blk_sub.cv;
		361
392	if (CvDEPTH(cv))	362	if (CvDEPTH (cv))
393	{	363	{
394	#ifdef USE_THREADS
395	/*XPUSHs ((SV *)CvOWNER(cv));*/
396	/*CvOWNER(cv) = 0;*/
397	/*error must unlock this cv etc.. etc...*/
398	#endif
399	EXTEND (SP, CvDEPTH(cv)*2);	364	EXTEND (SP, 3);
400		365
401	while (--CvDEPTH(cv))
402	{
403	/* this tells the restore code to increment CvDEPTH */
404	PUSHs (Nullsv);
405	PUSHs ((SV *)cv);
406	}
407
408	PUSHs ((SV *)CvPADLIST(cv));	366	PUSHs ((SV *)CvPADLIST (cv));
		367	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
409	PUSHs ((SV *)cv);	368	PUSHs ((SV *)cv);
410		369
		370	CvDEPTH (cv) = 0;
411	get_padlist (cv); /* this is a monster */	371	get_padlist (cv);
412	}	372	}
413	}	373	}
414	#ifdef CXt_FORMAT	374	#ifdef CXt_FORMAT
415	else if (CxTYPE(cx) == CXt_FORMAT)	375	else if (CxTYPE (cx) == CXt_FORMAT)
416	{	376	{
417	/* I never used formats, so how should I know how these are implemented? */	377	/* I never used formats, so how should I know how these are implemented? */
418	/* my bold guess is as a simple, plain sub... */	378	/* my bold guess is as a simple, plain sub... */
419	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
420	}	380	}
…		…
430	}	390	}
431		391
432	PUTBACK;	392	PUTBACK;
433	}	393	}
434		394
435	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	395	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
436	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	396	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
437	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	397	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		398	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
438		399
439	c->dowarn = PL_dowarn;	400	#define VAR(name,type)c->name = PL_ ## name;
440	c->in_eval = PL_in_eval;	401	# include "state.h"
441		402	#undef VAR
442	c->curstackinfo = PL_curstackinfo;
443	c->curstack = PL_curstack;
444	c->mainstack = PL_mainstack;
445	c->stack_sp = PL_stack_sp;
446	c->op = PL_op;
447	c->curpad = PL_curpad;
448	c->comppad = PL_comppad;
449	c->stack_base = PL_stack_base;
450	c->stack_max = PL_stack_max;
451	c->tmps_stack = PL_tmps_stack;
452	c->tmps_floor = PL_tmps_floor;
453	c->tmps_ix = PL_tmps_ix;
454	c->tmps_max = PL_tmps_max;
455	c->markstack = PL_markstack;
456	c->markstack_ptr = PL_markstack_ptr;
457	c->markstack_max = PL_markstack_max;
458	c->scopestack = PL_scopestack;
459	c->scopestack_ix = PL_scopestack_ix;
460	c->scopestack_max = PL_scopestack_max;
461	c->savestack = PL_savestack;
462	c->savestack_ix = PL_savestack_ix;
463	c->savestack_max = PL_savestack_max;
464	c->retstack = PL_retstack;
465	c->retstack_ix = PL_retstack_ix;
466	c->retstack_max = PL_retstack_max;
467	c->curcop = PL_curcop;
468	c->top_env = PL_top_env;
469	}	403	}
470		404
471	/*	405	/*
472	* allocate various perl stacks. This is an exact copy	406	* allocate various perl stacks. This is an exact copy
473	* of perl.c:init_stacks, except that it uses less memory	407	* of perl.c:init_stacks, except that it uses less memory
474	* on the (sometimes correct) assumption that coroutines do	408	* on the (sometimes correct) assumption that coroutines do
475	* not usually need a lot of stackspace.	409	* not usually need a lot of stackspace.
476	*/	410	*/
477	STATIC void	411	static void
478	coro_init_stacks (pTHX)	412	coro_init_stacks ()
479	{	413	{
480	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	414	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
481	PL_curstackinfo->si_type = PERLSI_MAIN;	415	PL_curstackinfo->si_type = PERLSI_MAIN;
482	PL_curstack = PL_curstackinfo->si_stack;	416	PL_curstack = PL_curstackinfo->si_stack;
483	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	417	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
484		418
485	PL_stack_base = AvARRAY(PL_curstack);	419	PL_stack_base = AvARRAY(PL_curstack);
486	PL_stack_sp = PL_stack_base;	420	PL_stack_sp = PL_stack_base;
487	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	421	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
488		422
489	New(50,PL_tmps_stack,96,SV*);	423	New(50,PL_tmps_stack,128,SV*);
490	PL_tmps_floor = -1;	424	PL_tmps_floor = -1;
491	PL_tmps_ix = -1;	425	PL_tmps_ix = -1;
492	PL_tmps_max = 96;	426	PL_tmps_max = 128;
493		427
494	New(54,PL_markstack,16,I32);	428	New(54,PL_markstack,32,I32);
495	PL_markstack_ptr = PL_markstack;	429	PL_markstack_ptr = PL_markstack;
496	PL_markstack_max = PL_markstack + 16;	430	PL_markstack_max = PL_markstack + 32;
497		431
498	#ifdef SET_MARK_OFFSET	432	#ifdef SET_MARK_OFFSET
499	SET_MARK_OFFSET;	433	SET_MARK_OFFSET;
500	#endif	434	#endif
501		435
502	New(54,PL_scopestack,16,I32);	436	New(54,PL_scopestack,32,I32);
503	PL_scopestack_ix = 0;	437	PL_scopestack_ix = 0;
504	PL_scopestack_max = 16;	438	PL_scopestack_max = 32;
505		439
506	New(54,PL_savestack,96,ANY);	440	New(54,PL_savestack,64,ANY);
507	PL_savestack_ix = 0;	441	PL_savestack_ix = 0;
508	PL_savestack_max = 96;	442	PL_savestack_max = 64;
509		443
		444	#if !PERL_VERSION_ATLEAST (5,9,0)
510	New(54,PL_retstack,8,OP*);	445	New(54,PL_retstack,16,OP*);
511	PL_retstack_ix = 0;	446	PL_retstack_ix = 0;
512	PL_retstack_max = 8;	447	PL_retstack_max = 16;
		448	#endif
513	}	449	}
514		450
515	/*	451	/*
516	* destroy the stacks, the callchain etc...	452	* destroy the stacks, the callchain etc...
517	*/	453	*/
518	STATIC void	454	static void
519	destroy_stacks(pTHX)	455	coro_destroy_stacks ()
520	{	456	{
521	if (!IN_DESTRUCT)	457	if (!IN_DESTRUCT)
522	{	458	{
523	/* is this ugly, I ask? */	459	/* is this ugly, I ask? */
524	LEAVE_SCOPE (0);	460	LEAVE_SCOPE (0);
525		461
526	/* sure it is, but more important: is it correct?? :/ */	462	/* sure it is, but more important: is it correct?? :/ */
527	FREETMPS;	463	FREETMPS;
		464
		465	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
528	}	466	}
529		467
530	while (PL_curstackinfo->si_next)	468	while (PL_curstackinfo->si_next)
531	PL_curstackinfo = PL_curstackinfo->si_next;	469	PL_curstackinfo = PL_curstackinfo->si_next;
532		470
533	while (PL_curstackinfo)	471	while (PL_curstackinfo)
534	{	472	{
535	PERL_SI *p = PL_curstackinfo->si_prev;	473	PERL_SI *p = PL_curstackinfo->si_prev;
536		474
537	{	475	{ /*D*//*remove*/
538	dSP;	476	dSP;
539	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	477	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
540	PUTBACK; /* possibly superfluous */	478	PUTBACK; /* possibly superfluous */
541	}	479	}
542		480
543	if (!IN_DESTRUCT)	481	if (!IN_DESTRUCT)
544	{	482	{
545	dounwind(-1);	483	dounwind (-1);/*D*//*remove*/
546	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
547	}	485	}
548		486
549	Safefree(PL_curstackinfo->si_cxstack);	487	Safefree (PL_curstackinfo->si_cxstack);
550	Safefree(PL_curstackinfo);	488	Safefree (PL_curstackinfo);
551	PL_curstackinfo = p;	489	PL_curstackinfo = p;
552	}	490	}
553		491
554	Safefree(PL_tmps_stack);	492	Safefree (PL_tmps_stack);
555	Safefree(PL_markstack);	493	Safefree (PL_markstack);
556	Safefree(PL_scopestack);	494	Safefree (PL_scopestack);
557	Safefree(PL_savestack);	495	Safefree (PL_savestack);
		496	#if !PERL_VERSION_ATLEAST (5,9,0)
558	Safefree(PL_retstack);	497	Safefree (PL_retstack);
559	}
560
561	static void
562	allocate_stack (Coro__State ctx, int alloc)
563	{
564	coro_stack *stack;
565
566	New (0, stack, 1, coro_stack);
567
568	stack->refcnt = 1;
569	stack->usecnt = 1;
570	stack->gencnt = ctx->gencnt = 0;
571	if (alloc)
572	{
573	#if HAVE_MMAP
574	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
575	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
576	if (stack->sptr == (void *)-1)
577	#endif	498	#endif
578	{
579	/*FIXME*//*D*//* reasonable stack size! */
580	stack->ssize = - (16384 * sizeof (long));
581	New (0, stack->sptr, 16384, long);
582	}
583	}
584	else
585	stack->sptr = 0;
586
587	ctx->stack = stack;
588	}	499	}
589		500
590	static void	501	static void
591	deallocate_stack (Coro__State ctx)	502	setup_coro (struct coro *coro)
592	{
593	coro_stack *stack = ctx->stack;
594
595	ctx->stack = 0;
596
597	if (stack)
598	{
599	if (!--stack->refcnt)
600	{
601	#ifdef HAVE_MMAP
602	if (stack->ssize > 0 && stack->sptr)
603	munmap (stack->sptr, stack->ssize);
604	else
605	#endif
606	Safefree (stack->sptr);
607
608	Safefree (stack);
609	}
610	else if (ctx->gencnt == stack->gencnt)
611	--stack->usecnt;
612	}
613	}
614
615	static void
616	setup_coro (void *arg)
617	{	503	{
618	/*	504	/*
619	* emulate part of the perl startup here.	505	* emulate part of the perl startup here.
620	*/	506	*/
		507
		508	coro_init_stacks ();
		509
		510	PL_curcop = &PL_compiling;
		511	PL_in_eval = EVAL_NULL;
		512	PL_curpm = 0;
		513	PL_localizing = 0;
		514	PL_dirty = 0;
		515	PL_restartop = 0;
		516
		517	{
		518	dSP;
		519	LOGOP myop;
		520
		521	SvREFCNT_dec (GvAV (PL_defgv));
		522	GvAV (PL_defgv) = coro->args; coro->args = 0;
		523
		524	Zero (&myop, 1, LOGOP);
		525	myop.op_next = Nullop;
		526	myop.op_flags = OPf_WANT_VOID;
		527
		528	PUSHMARK (SP);
		529	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		530	PUTBACK;
		531	PL_op = (OP *)&myop;
		532	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		533	SPAGAIN;
		534	}
		535
		536	ENTER; /* necessary e.g. for dounwind */
		537	}
		538
		539	static void
		540	free_coro_mortal ()
		541	{
		542	if (coro_mortal)
		543	{
		544	SvREFCNT_dec (coro_mortal);
		545	coro_mortal = 0;
		546	}
		547	}
		548
		549	/* inject a fake call to Coro::State::_cctx_init into the execution */
		550	static void NOINLINE
		551	prepare_cctx (coro_cctx *cctx)
		552	{
621	dSP;	553	dSP;
622	Coro__State ctx = (Coro__State)arg;	554	LOGOP myop;
623	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
624		555
625	coro_init_stacks (aTHX);	556	Zero (&myop, 1, LOGOP);
626	/*PL_curcop = 0;*/	557	myop.op_next = PL_op;
627	/*PL_in_eval = PL_in_eval;*/ /* inherit */	558	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
628	SvREFCNT_dec (GvAV (PL_defgv));
629	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
630		559
		560	PUSHMARK (SP);
		561	EXTEND (SP, 2);
		562	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		563	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		564	PUTBACK;
		565	PL_op = (OP *)&myop;
		566	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
631	SPAGAIN;	567	SPAGAIN;
632
633	if (ctx->stack)
634	{
635	ctx->cursp = 0;
636
637	PUSHMARK(SP);
638	PUTBACK;
639	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
640
641	if (SvTRUE (ERRSV))
642	croak (NULL);
643	else
644	croak ("FATAL: CCTXT coroutine returned!");
645	}
646	else
647	{
648	UNOP myop;
649
650	PL_op = (OP *)&myop;
651
652	Zero(&myop, 1, UNOP);
653	myop.op_next = Nullop;
654	myop.op_flags = OPf_WANT_VOID;
655
656	PUSHMARK(SP);
657	XPUSHs (sub_init);
658	/*
659	* the next line is slightly wrong, as PL_op->op_next
660	* is actually being executed so we skip the first op.
661	* that doesn't matter, though, since it is only
662	* pp_nextstate and we never return...
663	* ah yes, and I don't care anyways ;)
664	*/
665	PUTBACK;
666	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
667	SPAGAIN;
668
669	ENTER; /* necessary e.g. for dounwind */
670	}
671	}	568	}
672		569
673	static void	570	static void
674	continue_coro (void *arg)	571	coro_run (void *arg)
675	{	572	{
		573	/* coro_run is the alternative tail of transfer(), so unlock here. */
		574	UNLOCK;
		575
676	/*	576	/*
677	* this is a _very_ stripped down perl interpreter ;)	577	* this is a _very_ stripped down perl interpreter ;)
678	*/	578	*/
679	Coro__State ctx = (Coro__State)arg;
680	JMPENV coro_start_env;
681
682	PL_top_env = &ctx->start_env;	579	PL_top_env = &PL_start_env;
683		580
684	ctx->cursp = 0;	581	/* inject call to cctx_init */
685	PL_op = PL_op->op_next;	582	prepare_cctx ((coro_cctx *)arg);
686	CALLRUNOPS(aTHX);
687		583
		584	/* somebody will hit me for both perl_run and PL_restartop */
		585	PL_restartop = PL_op;
		586	perl_run (PL_curinterp);
		587
		588	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
688	abort ();	589	abort ();
689	}	590	}
690		591
691	STATIC void	592	static coro_cctx *
		593	cctx_new ()
		594	{
		595	coro_cctx *cctx;
		596
		597	++cctx_count;
		598
		599	Newz (0, cctx, 1, coro_cctx);
		600
		601	#if HAVE_MMAP
		602
		603	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		604	/* mmap supposedly does allocate-on-write for us */
		605	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		606
		607	if (cctx->sptr == (void *)-1)
		608	{
		609	perror ("FATAL: unable to mmap stack for coroutine");
		610	_exit (EXIT_FAILURE);
		611	}
		612
		613	# if STACKGUARD
		614	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		615	# endif
		616
		617	#else
		618
		619	cctx->ssize = STACKSIZE * (long)sizeof (long);
		620	New (0, cctx->sptr, STACKSIZE, long);
		621
		622	if (!cctx->sptr)
		623	{
		624	perror ("FATAL: unable to malloc stack for coroutine");
		625	_exit (EXIT_FAILURE);
		626	}
		627
		628	#endif
		629
		630	#if USE_VALGRIND
		631	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		632	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		633	cctx->ssize + (char *)cctx->sptr
		634	);
		635	#endif
		636
		637	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		638
		639	return cctx;
		640	}
		641
		642	static void
		643	cctx_destroy (coro_cctx *cctx)
		644	{
		645	if (!cctx)
		646	return;
		647
		648	--cctx_count;
		649
		650	#if USE_VALGRIND
		651	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		652	#endif
		653
		654	#if HAVE_MMAP
		655	munmap (cctx->sptr, cctx->ssize);
		656	#else
		657	Safefree (cctx->sptr);
		658	#endif
		659
		660	Safefree (cctx);
		661	}
		662
		663	static coro_cctx *
		664	cctx_get ()
		665	{
		666	coro_cctx *cctx;
		667
		668	if (cctx_first)
		669	{
		670	cctx = cctx_first;
		671	cctx_first = cctx->next;
		672	--cctx_idle;
		673	}
		674	else
		675	{
		676	cctx = cctx_new ();
		677	PL_op = PL_op->op_next;
		678	}
		679
		680	return cctx;
		681	}
		682
		683	static void
		684	cctx_put (coro_cctx *cctx)
		685	{
		686	/* free another cctx if overlimit */
		687	if (cctx_idle >= MAX_IDLE_CCTX)
		688	{
		689	coro_cctx *first = cctx_first;
		690	cctx_first = first->next;
		691	--cctx_idle;
		692
		693	assert (!first->inuse);
		694	cctx_destroy (first);
		695	}
		696
		697	++cctx_idle;
		698	cctx->next = cctx_first;
		699	cctx_first = cctx;
		700	}
		701
		702	/* never call directly, always through the coro_state_transfer global variable */
		703	static void NOINLINE
692	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	704	transfer (struct coro *prev, struct coro *next)
693	{	705	{
694	dSTACKLEVEL;	706	dSTACKLEVEL;
695	static struct coro *xnext;
696		707
		708	/* sometimes transfer is only called to set idle_sp */
		709	if (!next)
		710	{
		711	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		712	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		713	}
697	if (prev != next)	714	else if (prev != next)
698	{	715	{
699	xnext = next;	716	coro_cctx *prev__cctx;
700		717
701	if (next->mainstack)	718	if (prev->flags & CF_NEW)
702	{	719	{
703	SAVE (prev, flags);	720	/* create a new empty context */
704	LOAD (next);	721	Newz (0, prev->cctx, 1, coro_cctx);
705		722	prev->cctx->inuse = 1;
706	/* mark this state as in-use */	723	prev->flags &= ~CF_NEW;
707	next->mainstack = 0;	724	prev->flags |= CF_RUNNING;
708	next->tmps_ix = -2;
709
710	/* stacklevel changed? if yes, grab the stack for us! */
711	if (flags & TRANSFER_SAVE_CCTXT)
712	{
713	if (!prev->stack)
714	allocate_stack (prev, 0);
715	else if (prev->cursp != stacklevel
716	&& prev->stack->usecnt > 1)
717	{
718	prev->gencnt = ++prev->stack->gencnt;
719	prev->stack->usecnt = 1;
720	}
721
722	/* has our stack been invalidated? */
723	if (next->stack && next->stack->gencnt != next->gencnt)
724	{
725	deallocate_stack (next);
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	continue_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	}
731
732	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
733	/* don't add any code here */
734	}
735
736	}	725	}
737	else if (next->tmps_ix == -2)	726
738	croak ("tried to transfer to running coroutine");	727	/*TODO: must not croak here */
		728	if (!prev->flags & CF_RUNNING)
		729	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		730
		731	if (next->flags & CF_RUNNING)
		732	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		733
		734	prev->flags &= ~CF_RUNNING;
		735	next->flags |= CF_RUNNING;
		736
		737	LOCK;
		738
		739	if (next->flags & CF_NEW)
		740	{
		741	/* need to start coroutine */
		742	next->flags &= ~CF_NEW;
		743	/* first get rid of the old state */
		744	save_perl (prev);
		745	/* setup coroutine call */
		746	setup_coro (next);
		747	/* need a new stack */
		748	assert (!next->cctx);
		749	}
739	else	750	else
740	{	751	{
741	SAVE (prev, -1); /* first get rid of the old state */	752	/* coroutine already started */
742		753	save_perl (prev);
743	if (flags & TRANSFER_SAVE_CCTXT)	754	load_perl (next);
744	{
745	if (!prev->stack)
746	allocate_stack (prev, 0);
747
748	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
749	{
750	PL_top_env = &next->start_env;
751
752	setup_coro (next);
753
754	prev->stack->refcnt++;
755	prev->stack->usecnt++;
756	next->stack = prev->stack;
757	next->gencnt = prev->gencnt;
758	}
759	else
760	{
761	assert (!next->stack);
762	allocate_stack (next, 1);
763	coro_create (&(next->stack->cctx),
764	setup_coro, (void *)next,
765	next->stack->sptr, labs (next->stack->ssize));
766	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
767	/* don't add any code here */
768	}
769	}
770	else
771	setup_coro (next);
772	}	755	}
773		756
774	/*	757	prev__cctx = prev->cctx;
775	* xnext is now either prev or next, depending on wether	758
776	* we switched the c stack or not. that's why I use a global	759	/* possibly "free" the cctx */
777	* variable, that should become thread-specific at one point.	760	if (prev__cctx->idle_sp == STACKLEVEL)
778	*/	761	{
779	xnext->cursp = stacklevel;	762	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		763	assert (PL_top_env == prev__cctx->top_env);
		764
		765	prev->cctx = 0;
		766
		767	cctx_put (prev__cctx);
		768	prev__cctx->inuse = 0;
		769	}
		770
		771	if (!next->cctx)
		772	{
		773	next->cctx = cctx_get ();
		774	assert (!next->cctx->inuse);
		775	next->cctx->inuse = 1;
		776	}
		777
		778	if (prev__cctx != next->cctx)
		779	{
		780	prev__cctx->top_env = PL_top_env;
		781	PL_top_env = next->cctx->top_env;
		782	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		783	}
		784
		785	free_coro_mortal ();
		786
		787	UNLOCK;
780	}	788	}
		789	}
781		790
782	if (coro_mortal)	791	struct transfer_args
		792	{
		793	struct coro *prev, *next;
		794	};
		795
		796	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		797
		798	static void
		799	coro_state_destroy (struct coro *coro)
		800	{
		801	if (coro->refcnt--)
		802	return;
		803
		804	if (coro->mainstack && coro->mainstack != main_mainstack)
783	{	805	{
784	SvREFCNT_dec (coro_mortal);	806	struct coro temp;
		807	Zero (&temp, 1, struct coro);
		808	temp.save = CORO_SAVE_ALL;
		809
		810	if (coro->flags & CF_RUNNING)
		811	croak ("FATAL: tried to destroy currently running coroutine");
		812
		813	save_perl (&temp);
		814	load_perl (coro);
		815
		816	coro_destroy_stacks ();
		817
		818	load_perl (&temp); /* this will get rid of defsv etc.. */
		819
785	coro_mortal = 0;	820	coro->mainstack = 0;
786	}	821	}
787	}
788		822
789	#define SV_CORO(sv,func) \	823	cctx_destroy (coro->cctx);
790	do { \	824	SvREFCNT_dec (coro->args);
791	if (SvROK (sv)) \	825	Safefree (coro);
792	sv = SvRV (sv); \	826	}
793	\
794	if (SvTYPE(sv) == SVt_PVHV) \
795	{ \
796	HE *he = hv_fetch_ent((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
797	\
798	if (!he) \
799	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
800	\
801	(sv) = SvRV (HeVAL(he)); \
802	} \
803	\
804	/* must also be changed inside Coro::Cont::yield */ \
805	if (!SvOBJECT(sv) || SvSTASH(sv) != coro_state_stash) \
806	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
807	\
808	} while(0)
809		827
810	#define SvSTATE(sv) (struct coro *)SvIV (sv)
811
812	static void	828	static int
		829	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		830	{
		831	struct coro *coro = (struct coro *)mg->mg_ptr;
		832	mg->mg_ptr = 0;
		833
		834	coro_state_destroy (coro);
		835
		836	return 0;
		837	}
		838
		839	static int
		840	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		841	{
		842	struct coro *coro = (struct coro *)mg->mg_ptr;
		843
		844	++coro->refcnt;
		845
		846	return 0;
		847	}
		848
		849	static MGVTBL coro_state_vtbl = {
		850	0, 0, 0, 0,
		851	coro_state_clear,
		852	0,
		853	#ifdef MGf_DUP
		854	coro_state_dup,
		855	#else
		856	# define MGf_DUP 0
		857	#endif
		858	};
		859
		860	static struct coro *
		861	SvSTATE (SV *coro)
		862	{
		863	HV *stash;
		864	MAGIC *mg;
		865
		866	if (SvROK (coro))
		867	coro = SvRV (coro);
		868
		869	stash = SvSTASH (coro);
		870	if (stash != coro_stash && stash != coro_state_stash)
		871	{
		872	/* very slow, but rare, check */
		873	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		874	croak ("Coro::State object required");
		875	}
		876
		877	mg = SvMAGIC (coro);
		878	assert (mg->mg_type == PERL_MAGIC_ext);
		879	return (struct coro *)mg->mg_ptr;
		880	}
		881
		882	static void
		883	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		884	{
		885	ta->prev = SvSTATE (prev_sv);
		886	ta->next = SvSTATE (next_sv);
		887	}
		888
		889	static void
813	api_transfer(pTHX_ SV *prev, SV *next, int flags)	890	api_transfer (SV *prev_sv, SV *next_sv)
814	{	891	{
815	SV_CORO (prev, "Coro::transfer");	892	struct transfer_args ta;
816	SV_CORO (next, "Coro::transfer");
817		893
818	transfer(aTHX_ SvSTATE(prev), SvSTATE(next), flags);	894	prepare_transfer (&ta, prev_sv, next_sv);
		895	TRANSFER (ta);
		896	}
		897
		898	static int
		899	api_save (SV *coro_sv, int new_save)
		900	{
		901	struct coro *coro = SvSTATE (coro_sv);
		902	int old_save = coro->save;
		903
		904	if (new_save >= 0)
		905	coro->save = new_save;
		906
		907	return old_save;
819	}	908	}
820		909
821	/** Coro ********************************************************************/	910	/** Coro ********************************************************************/
822		911
823	#define PRIO_MAX 3	912	#define PRIO_MAX 3
…		…
826	#define PRIO_LOW -1	915	#define PRIO_LOW -1
827	#define PRIO_IDLE -3	916	#define PRIO_IDLE -3
828	#define PRIO_MIN -4	917	#define PRIO_MIN -4
829		918
830	/* for Coro.pm */	919	/* for Coro.pm */
831	static GV *coro_current, *coro_idle;	920	static SV *coro_current;
832	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	921	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
833	static int coro_nready;	922	static int coro_nready;
834		923
835	static void	924	static void
836	coro_enq (SV *sv)	925	coro_enq (SV *coro_sv)
837	{	926	{
838	if (SvTYPE (sv) == SVt_PVHV)
839	{
840	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
841	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
842
843	prio = prio > PRIO_MAX ? PRIO_MAX
844	: prio < PRIO_MIN ? PRIO_MIN
845	: prio;
846
847	av_push (coro_ready [prio - PRIO_MIN], sv);	927	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
848	coro_nready++;	928	coro_nready++;
849
850	return;
851	}
852
853	croak ("Coro::ready tried to enqueue something that is not a coroutine");
854	}	929	}
855		930
856	static SV *	931	static SV *
857	coro_deq (int min_prio)	932	coro_deq (int min_prio)
858	{	933	{
…		…
861	min_prio -= PRIO_MIN;	936	min_prio -= PRIO_MIN;
862	if (min_prio < 0)	937	if (min_prio < 0)
863	min_prio = 0;	938	min_prio = 0;
864		939
865	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	940	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
866	if (av_len (coro_ready[prio]) >= 0)	941	if (AvFILLp (coro_ready [prio]) >= 0)
867	{	942	{
868	coro_nready--;	943	coro_nready--;
869	return av_shift (coro_ready[prio]);	944	return av_shift (coro_ready [prio]);
870	}	945	}
871		946
872	return 0;	947	return 0;
873	}	948	}
874		949
875	static void	950	static int
876	api_ready (SV *coro)	951	api_ready (SV *coro_sv)
877	{	952	{
		953	struct coro *coro;
		954
878	if (SvROK (coro))	955	if (SvROK (coro_sv))
879	coro = SvRV (coro);	956	coro_sv = SvRV (coro_sv);
880		957
		958	coro = SvSTATE (coro_sv);
		959
		960	if (coro->flags & CF_READY)
		961	return 0;
		962
		963	#if 0 /* this is actually harmless */
		964	if (coro->flags & CF_RUNNING)
		965	croak ("Coro::ready called on currently running coroutine");
		966	#endif
		967
		968	coro->flags |= CF_READY;
		969
		970	LOCK;
881	coro_enq (SvREFCNT_inc (coro));	971	coro_enq (SvREFCNT_inc (coro_sv));
		972	UNLOCK;
		973
		974	return 1;
		975	}
		976
		977	static int
		978	api_is_ready (SV *coro_sv)
		979	{
		980	return !!SvSTATE (coro_sv)->flags & CF_READY;
		981	}
		982
		983	static void
		984	prepare_schedule (struct transfer_args *ta)
		985	{
		986	SV *prev, *next;
		987
		988	for (;;)
		989	{
		990	LOCK;
		991	next = coro_deq (PRIO_MIN);
		992	UNLOCK;
		993
		994	if (next)
		995	break;
		996
		997	{
		998	dSP;
		999
		1000	ENTER;
		1001	SAVETMPS;
		1002
		1003	PUSHMARK (SP);
		1004	PUTBACK;
		1005	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1006
		1007	FREETMPS;
		1008	LEAVE;
		1009	}
		1010	}
		1011
		1012	prev = SvRV (coro_current);
		1013	SvRV_set (coro_current, next);
		1014
		1015	/* free this only after the transfer */
		1016	LOCK;
		1017	free_coro_mortal ();
		1018	UNLOCK;
		1019	coro_mortal = prev;
		1020
		1021	assert (!SvROK(prev));//D
		1022	assert (!SvROK(next));//D
		1023
		1024	ta->prev = SvSTATE (prev);
		1025	ta->next = SvSTATE (next);
		1026
		1027	assert (ta->next->flags & CF_READY);
		1028	ta->next->flags &= ~CF_READY;
		1029	}
		1030
		1031	static void
		1032	prepare_cede (struct transfer_args *ta)
		1033	{
		1034	api_ready (coro_current);
		1035
		1036	prepare_schedule (ta);
882	}	1037	}
883		1038
884	static void	1039	static void
885	api_schedule (void)	1040	api_schedule (void)
886	{	1041	{
887	SV *prev, *next;	1042	struct transfer_args ta;
888		1043
889	prev = SvRV (GvSV (coro_current));	1044	prepare_schedule (&ta);
890	next = coro_deq (PRIO_MIN);	1045	TRANSFER (ta);
891
892	if (!next)
893	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
894
895	/* free this only after the transfer */
896	coro_mortal = prev;
897	SV_CORO (prev, "Coro::schedule");
898
899	SvRV (GvSV (coro_current)) = next;
900
901	SV_CORO (next, "Coro::schedule");
902
903	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
904	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
905	}	1046	}
906		1047
907	static void	1048	static void
908	api_cede (void)	1049	api_cede (void)
909	{	1050	{
910	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));	1051	struct transfer_args ta;
911		1052
912	api_schedule ();	1053	prepare_cede (&ta);
		1054	TRANSFER (ta);
913	}	1055	}
914		1056
915	MODULE = Coro::State PACKAGE = Coro::State	1057	MODULE = Coro::State PACKAGE = Coro::State
916		1058
917	PROTOTYPES: ENABLE	1059	PROTOTYPES: DISABLE
918		1060
919	BOOT:	1061	BOOT:
920	{ /* {} necessary for stoopid perl-5.6.x */	1062	{
921	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1063	#ifdef USE_ITHREADS
922	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1064	MUTEX_INIT (&coro_mutex);
		1065	#endif
		1066	BOOT_PAGESIZE;
		1067
923	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1068	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
924		1069
925	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1070	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
926	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1071	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
927	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1072	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1073	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
928	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1074	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
929
930	if (!padlist_cache)
931	padlist_cache = newHV ();
932		1075
933	main_mainstack = PL_mainstack;	1076	main_mainstack = PL_mainstack;
934		1077
935	coroapi.ver = CORO_API_VERSION;	1078	coroapi.ver = CORO_API_VERSION;
936	coroapi.transfer = api_transfer;	1079	coroapi.transfer = api_transfer;
937	}
938		1080
939	Coro::State	1081	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
940	_newprocess(args)	1082	}
941	SV * args	1083
942	PROTOTYPE: $	1084	SV *
		1085	new (char *klass, ...)
943	CODE:	1086	CODE:
944	Coro__State coro;	1087	{
		1088	struct coro *coro;
		1089	HV *hv;
		1090	int i;
945		1091
946	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
947	croak ("Coro::State::_newprocess expects an arrayref");
948
949	Newz (0, coro, 1, struct coro);	1092	Newz (0, coro, 1, struct coro);
		1093	coro->args = newAV ();
		1094	coro->save = CORO_SAVE_ALL;
		1095	coro->flags = CF_NEW;
950		1096
951	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1097	hv = newHV ();
952	coro->mainstack = 0; /* actual work is done inside transfer */	1098	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
953	coro->stack = 0;	1099	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
954		1100
955	/* same as JMPENV_BOOTSTRAP */	1101	for (i = 1; i < items; i++)
956	/* we might be able to recycle start_env, but safe is safe */	1102	av_push (coro->args, newSVsv (ST (i)));
957	//Zero(&coro->start_env, 1, JMPENV);	1103	}
958	coro->start_env.je_ret = -1;
959	coro->start_env.je_mustcatch = TRUE;
960
961	RETVAL = coro;
962	OUTPUT:	1104	OUTPUT:
963	RETVAL	1105	RETVAL
964		1106
		1107	int
		1108	save (SV *coro, int new_save = -1)
		1109	CODE:
		1110	RETVAL = api_save (coro, new_save);
		1111	OUTPUT:
		1112	RETVAL
		1113
965	void	1114	void
966	transfer(prev, next, flags)	1115	_set_stacklevel (...)
967	SV *prev	1116	ALIAS:
968	SV *next	1117	Coro::State::transfer = 1
969	int flags	1118	Coro::schedule = 2
970	PROTOTYPE: @	1119	Coro::cede = 3
971	CODE:	1120	CODE:
972	PUTBACK;	1121	{
973	SV_CORO (next, "Coro::transfer");	1122	struct transfer_args ta;
974	SV_CORO (prev, "Coro::transfer");	1123
975	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1124	switch (ix)
976	SPAGAIN;	1125	{
		1126	case 0:
		1127	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1128	ta.next = 0;
		1129	break;
		1130
		1131	case 1:
		1132	if (items != 2)
		1133	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1134
		1135	prepare_transfer (&ta, ST (0), ST (1));
		1136	break;
		1137
		1138	case 2:
		1139	prepare_schedule (&ta);
		1140	break;
		1141
		1142	case 3:
		1143	prepare_cede (&ta);
		1144	break;
		1145	}
		1146
		1147	TRANSFER (ta);
		1148	}
977		1149
978	void	1150	void
979	DESTROY(coro)	1151	_clone_state_from (SV *dst, SV *src)
980	Coro::State coro	1152	CODE:
981	CODE:	1153	{
		1154	struct coro *coro_src = SvSTATE (src);
982		1155
983	if (coro->mainstack && coro->mainstack != main_mainstack)	1156	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
984	{
985	struct coro temp;
986		1157
987	PUTBACK;	1158	++coro_src->refcnt;
988	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1159	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
989	LOAD(aTHX_ coro);	1160	}
990	SPAGAIN;
991
992	destroy_stacks (aTHX);
993
994	LOAD((&temp)); /* this will get rid of defsv etc.. */
995	SPAGAIN;
996
997	coro->mainstack = 0;
998	}
999
1000	deallocate_stack (coro);
1001	SvREFCNT_dec (coro->args);
1002	Safefree (coro);
1003		1161
1004	void	1162	void
1005	_exit(code)	1163	_exit (code)
1006	int code	1164	int code
1007	PROTOTYPE: $	1165	PROTOTYPE: $
1008	CODE:	1166	CODE:
1009	_exit (code);	1167	_exit (code);
1010		1168
1011	MODULE = Coro::State PACKAGE = Coro::Cont	1169	int
		1170	cctx_count ()
		1171	CODE:
		1172	RETVAL = cctx_count;
		1173	OUTPUT:
		1174	RETVAL
1012		1175
1013	# this is slightly dirty (should expose a c-level api)	1176	int
1014		1177	cctx_idle ()
1015	void	1178	CODE:
1016	yield(...)	1179	RETVAL = cctx_idle;
1017	PROTOTYPE: @	1180	OUTPUT:
1018	CODE:	1181	RETVAL
1019	static SV *returnstk;
1020	SV *sv;
1021	AV *defav = GvAV (PL_defgv);
1022	struct coro *prev, *next;
1023
1024	if (!returnstk)
1025	returnstk = SvRV ((SV *)get_sv ("Coro::Cont::return", FALSE));
1026
1027	/* set up @_ -- ugly */
1028	av_clear (defav);
1029	av_fill (defav, items - 1);
1030	while (items--)
1031	av_store (defav, items, SvREFCNT_inc (ST(items)));
1032
1033	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1034	sv = av_pop ((AV *)SvRV (returnstk));
1035	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1036	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1037	SvREFCNT_dec (sv);
1038
1039	transfer(aTHX_ prev, next, 0);
1040		1182
1041	MODULE = Coro::State PACKAGE = Coro	1183	MODULE = Coro::State PACKAGE = Coro
1042		1184
1043	# this is slightly dirty (should expose a c-level api)
1044
1045	BOOT:	1185	BOOT:
1046	{	1186	{
1047	int i;	1187	int i;
		1188
1048	HV *stash = gv_stashpv ("Coro", TRUE);	1189	coro_stash = gv_stashpv ("Coro", TRUE);
1049		1190
1050	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1191	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1051	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1192	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1052	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1193	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1053	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1194	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1054	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1195	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1055	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1196	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1056		1197
1057	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1198	coro_current = get_sv ("Coro::current", FALSE);
1058	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1199	SvREADONLY_on (coro_current);
1059		1200
1060	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1201	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1061	coro_ready[i] = newAV ();	1202	coro_ready[i] = newAV ();
1062		1203
1063	{	1204	{
1064	SV *sv = perl_get_sv("Coro::API", 1);	1205	SV *sv = perl_get_sv("Coro::API", 1);
1065		1206
1066	coroapi.schedule = api_schedule;	1207	coroapi.schedule = api_schedule;
		1208	coroapi.save = api_save;
1067	coroapi.cede = api_cede;	1209	coroapi.cede = api_cede;
1068	coroapi.ready = api_ready;	1210	coroapi.ready = api_ready;
		1211	coroapi.is_ready = api_is_ready;
1069	coroapi.nready = &coro_nready;	1212	coroapi.nready = &coro_nready;
1070	coroapi.current = coro_current;	1213	coroapi.current = coro_current;
1071		1214
1072	GCoroAPI = &coroapi;	1215	GCoroAPI = &coroapi;
1073	sv_setiv(sv, (IV)&coroapi);	1216	sv_setiv (sv, (IV)&coroapi);
1074	SvREADONLY_on(sv);	1217	SvREADONLY_on (sv);
1075	}	1218	}
1076	}	1219	}
1077		1220
1078	#if !PERL_MICRO
1079
1080	void	1221	void
1081	ready(self)	1222	_set_current (SV *current)
1082	SV * self
1083	PROTOTYPE: $	1223	PROTOTYPE: $
1084	CODE:	1224	CODE:
1085	api_ready (self);	1225	SvREFCNT_dec (SvRV (coro_current));
1086		1226	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1087	#endif
1088		1227
1089	int	1228	int
		1229	prio (Coro::State coro, int newprio = 0)
		1230	ALIAS:
		1231	nice = 1
		1232	CODE:
		1233	{
		1234	RETVAL = coro->prio;
		1235
		1236	if (items > 1)
		1237	{
		1238	if (ix)
		1239	newprio += coro->prio;
		1240
		1241	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1242	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1243
		1244	coro->prio = newprio;
		1245	}
		1246	}
		1247
		1248	SV *
		1249	ready (SV *self)
		1250	PROTOTYPE: $
		1251	CODE:
		1252	RETVAL = boolSV (api_ready (self));
		1253	OUTPUT:
		1254	RETVAL
		1255
		1256	SV *
		1257	is_ready (SV *self)
		1258	PROTOTYPE: $
		1259	CODE:
		1260	RETVAL = boolSV (api_is_ready (self));
		1261	OUTPUT:
		1262	RETVAL
		1263
		1264	int
1090	nready(...)	1265	nready (...)
1091	PROTOTYPE:	1266	PROTOTYPE:
1092	CODE:	1267	CODE:
1093	RETVAL = coro_nready;	1268	RETVAL = coro_nready;
1094	OUTPUT:	1269	OUTPUT:
1095	RETVAL	1270	RETVAL
1096		1271
		1272	MODULE = Coro::State PACKAGE = Coro::AIO
		1273
		1274	SV *
		1275	_get_state ()
		1276	CODE:
		1277	{
		1278	struct io_state *data;
		1279
		1280	RETVAL = newSV (sizeof (struct io_state));
		1281	data = (struct io_state *)SvPVX (RETVAL);
		1282	SvCUR_set (RETVAL, sizeof (struct io_state));
		1283	SvPOK_only (RETVAL);
		1284
		1285	data->errorno = errno;
		1286	data->laststype = PL_laststype;
		1287	data->laststatval = PL_laststatval;
		1288	data->statcache = PL_statcache;
		1289	}
		1290	OUTPUT:
		1291	RETVAL
		1292
1097	void	1293	void
1098	schedule(...)	1294	_set_state (char *data_)
1099	PROTOTYPE:	1295	PROTOTYPE: $
1100	CODE:	1296	CODE:
1101	api_schedule ();	1297	{
		1298	struct io_state *data = (void *)data_;
1102		1299
1103	void	1300	errno = data->errorno;
1104	cede(...)	1301	PL_laststype = data->laststype;
1105	PROTOTYPE:	1302	PL_laststatval = data->laststatval;
1106	CODE:	1303	PL_statcache = data->statcache;
1107	api_cede ();	1304	}
1108		1305

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