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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.67 by root, Mon Dec 12 20:07:44 2005 UTC vs.
Revision 1.123 by root, Mon Dec 4 21:56:00 2006 UTC

1	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
4		2
5	#include "EXTERN.h"	3	#include "EXTERN.h"
6	#include "perl.h"	4	#include "perl.h"
7	#include "XSUB.h"	5	#include "XSUB.h"
8		6
9	#include "patchlevel.h"	7	#include "patchlevel.h"
10		8
11	// threaded perls might need much more, 65536 or more,	9	#if USE_VALGRIND
12	// which is 0.5 to 1MB	10	# include <valgrind/valgrind.h>
13	#define STACKSIZE 16384	11	#endif
14		12
15	#if PERL_VERSION < 6	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)
16	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
17	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
18	# endif	25	# endif
19	# ifndef call_sv	26	# ifndef call_sv
20	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
31	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
32	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
33	# endif	40	# endif
34	#endif	41	#endif
35		42
36	#include <signal.h>	43	#include <stdio.h>
		44	#include <errno.h>
		45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
37		53
38	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
39	# include <unistd.h>	55	# include <unistd.h>
40	# include <sys/mman.h>	56	# include <sys/mman.h>
41	# ifndef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
…		…
43	# define MAP_ANONYMOUS MAP_ANON	59	# define MAP_ANONYMOUS MAP_ANON
44	# else	60	# else
45	# undef HAVE_MMAP	61	# undef HAVE_MMAP
46	# endif	62	# endif
47	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
48	#endif	71	# endif
49		72	#else
50	#define SUB_INIT "Coro::State::initialize"	73	# define PAGESIZE 0
51	#define UCORO_STATE "_coro_state"	74	# define BOOT_PAGESIZE (void)0
		75	#endif
52		76
53	/* The next macro should declare a variable stacklevel that contains and approximation	77	/* The next macro should declare a variable stacklevel that contains and approximation
54	* to the current C stack pointer. Its property is that it changes with each call	78	* to the current C stack pointer. Its property is that it changes with each call
55	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
56	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
57		82
58	#define IN_DESTRUCT (PL_main_cv == Nullcv)	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
59		84
60	#define labs(l) ((l) >= 0 ? (l) : -(l))	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
61		92
62	#include "CoroAPI.h"	93	#include "CoroAPI.h"
63		94
64	#ifdef USE_ITHREADS	95	#ifdef USE_ITHREADS
65	static perl_mutex coro_mutex;	96	static perl_mutex coro_mutex;
66	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	97	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
67	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	98	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
68	#else	99	#else
69	# define LOCK 0	100	# define LOCK (void)0
70	# define UNLOCK 0	101	# define UNLOCK (void)0
71	#endif	102	#endif
		103
		104	struct io_state
		105	{
		106	int errorno;
		107	I32 laststype;
		108	int laststatval;
		109	Stat_t statcache;
		110	};
72		111
73	static struct CoroAPI coroapi;	112	static struct CoroAPI coroapi;
74	static AV *main_mainstack; /* used to differentiate between $main and others */	113	static AV *main_mainstack; /* used to differentiate between $main and others */
75	static HV *coro_state_stash;	114	static HV *coro_state_stash, *coro_stash;
76	static SV *ucoro_state_sv;
77	static U32 ucoro_state_hash;
78	static SV *coro_mortal; /* will be freed after next transfer */	115	static SV *coro_mortal; /* will be freed after next transfer */
79		116
80	/* this is actually not only the c stack but also c registers etc... */	117	static struct coro_cctx *cctx_first;
		118	static int cctx_count, cctx_idle;
		119
		120	/* this is a structure representing a c-level coroutine */
81	typedef struct {	121	typedef struct coro_cctx {
82	int refcnt; /* pointer reference counter */	122	struct coro_cctx *next;
83	int usecnt; /* shared by how many coroutines */
84	int gencnt; /* generation counter */
85		123
86	coro_context cctx;	124	/* the stack */
87
88	void *sptr;	125	void *sptr;
89	long ssize; /* positive == mmap, otherwise malloc */	126	long ssize; /* positive == mmap, otherwise malloc */
90	} coro_stack;
91		127
		128	/* cpu state */
		129	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		130	JMPENV *top_env;
		131	coro_context cctx;
		132
		133	int inuse;
		134
		135	#if USE_VALGRIND
		136	int valgrind_id;
		137	#endif
		138	} coro_cctx;
		139
		140	enum {
		141	CF_RUNNING = 0x0001, /* coroutine is running */
		142	CF_READY = 0x0002, /* coroutine is ready */
		143	CF_NEW = 0x0004, /* ahs never been switched to */
		144	};
		145
		146	/* this is a structure representing a perl-level coroutine */
92	struct coro {	147	struct coro {
93	/* the top-level JMPENV for each coroutine, needed to catch dies. */	148	/* the c coroutine allocated to this perl coroutine, if any */
94	JMPENV start_env;	149	coro_cctx *cctx;
95
96	/* the optional C context */
97	coro_stack *stack;
98	void *cursp;
99	int gencnt;
100
101	/* optionally saved, might be zero */
102	AV *defav;
103	SV *defsv;
104	SV *errsv;
105
106	/* saved global state not related to stacks */
107	U8 dowarn;
108	I32 in_eval;
109
110	/* the stacks and related info (callchain etc..) */
111	PERL_SI *curstackinfo;
112	AV *curstack;
113	AV *mainstack;
114	SV **stack_sp;
115	OP *op;
116	SV **curpad;
117	AV *comppad;
118	CV *compcv;
119	SV **stack_base;
120	SV **stack_max;
121	SV **tmps_stack;
122	I32 tmps_floor;
123	I32 tmps_ix;
124	I32 tmps_max;
125	I32 *markstack;
126	I32 *markstack_ptr;
127	I32 *markstack_max;
128	I32 *scopestack;
129	I32 scopestack_ix;
130	I32 scopestack_max;
131	ANY *savestack;
132	I32 savestack_ix;
133	I32 savestack_max;
134	OP **retstack;
135	I32 retstack_ix;
136	I32 retstack_max;
137	PMOP *curpm;
138	COP *curcop;
139	JMPENV *top_env;
140		150
141	/* data associated with this coroutine (initial args) */	151	/* data associated with this coroutine (initial args) */
142	AV *args;	152	AV *args;
		153	int refcnt;
		154	int save; /* CORO_SAVE flags */
		155	int flags; /* CF_ flags */
		156
		157	/* optionally saved, might be zero */
		158	AV *defav; /* @_ */
		159	SV *defsv; /* $_ */
		160	SV *errsv; /* $@ */
		161	SV *irssv; /* $/ */
		162	SV *irssv_sv; /* real $/ cache */
		163
		164	#define VAR(name,type) type name;
		165	# include "state.h"
		166	#undef VAR
		167
		168	/* coro process data */
		169	int prio;
143	};	170	};
144		171
145	typedef struct coro *Coro__State;	172	typedef struct coro *Coro__State;
146	typedef struct coro *Coro__State_or_hashref;	173	typedef struct coro *Coro__State_or_hashref;
147		174
148	/* mostly copied from op.c:cv_clone2 */	175	static AV *
149	STATIC AV *	176	coro_clone_padlist (CV *cv)
150	clone_padlist (pTHX_ AV *protopadlist)
151	{	177	{
152	AV *av;	178	AV *padlist = CvPADLIST (cv);
153	I32 ix;
154	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
155	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
156	SV **pname = AvARRAY (protopad_name);
157	SV **ppad = AvARRAY (protopad);
158	I32 fname = AvFILLp (protopad_name);
159	I32 fpad = AvFILLp (protopad);
160	AV *newpadlist, *newpad_name, *newpad;	179	AV *newpadlist, *newpad;
161	SV **npad;
162
163	newpad_name = newAV ();
164	for (ix = fname; ix >= 0; ix--)
165	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
166
167	newpad = newAV ();
168	av_fill (newpad, AvFILLp (protopad));
169	npad = AvARRAY (newpad);
170		180
171	newpadlist = newAV ();	181	newpadlist = newAV ();
172	AvREAL_off (newpadlist);	182	AvREAL_off (newpadlist);
173	av_store (newpadlist, 0, (SV *) newpad_name);	183	#if PERL_VERSION_ATLEAST (5,9,0)
		184	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		185	#else
		186	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		187	#endif
		188	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		189	--AvFILLp (padlist);
		190
		191	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
174	av_store (newpadlist, 1, (SV *) newpad);	192	av_store (newpadlist, 1, (SV *)newpad);
175
176	av = newAV (); /* will be @_ */
177	av_extend (av, 0);
178	av_store (newpad, 0, (SV *) av);
179	AvFLAGS (av) = AVf_REIFY;
180
181	for (ix = fpad; ix > 0; ix--)
182	{
183	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
184
185	if (namesv && namesv != &PL_sv_undef)
186	{
187	char *name = SvPVX (namesv); /* XXX */
188
189	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
190	{ /* lexical from outside? */
191	npad[ix] = SvREFCNT_inc (ppad[ix]);
192	}
193	else
194	{ /* our own lexical */
195	SV *sv;
196	if (*name == '&')
197	sv = SvREFCNT_inc (ppad[ix]);
198	else if (*name == '@')
199	sv = (SV *) newAV ();
200	else if (*name == '%')
201	sv = (SV *) newHV ();
202	else
203	sv = NEWSV (0, 0);
204
205	#ifdef SvPADBUSY
206	if (!SvPADBUSY (sv))
207	#endif
208	SvPADMY_on (sv);
209
210	npad[ix] = sv;
211	}
212	}
213	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
214	{
215	npad[ix] = SvREFCNT_inc (ppad[ix]);
216	}
217	else
218	{
219	SV *sv = NEWSV (0, 0);
220	SvPADTMP_on (sv);
221	npad[ix] = sv;
222	}
223	}
224
225	#if 0 /* return -ENOTUNDERSTOOD */
226	/* Now that vars are all in place, clone nested closures. */
227
228	for (ix = fpad; ix > 0; ix--) {
229	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
230	if (namesv
231	&& namesv != &PL_sv_undef
232	&& !(SvFLAGS(namesv) & SVf_FAKE)
233	&& *SvPVX(namesv) == '&'
234	&& CvCLONE(ppad[ix]))
235	{
236	CV *kid = cv_clone((CV*)ppad[ix]);
237	SvREFCNT_dec(ppad[ix]);
238	CvCLONE_on(kid);
239	SvPADMY_on(kid);
240	npad[ix] = (SV*)kid;
241	}
242	}
243	#endif
244		193
245	return newpadlist;	194	return newpadlist;
246	}	195	}
247		196
248	STATIC void	197	static void
249	free_padlist (pTHX_ AV *padlist)	198	free_padlist (AV *padlist)
250	{	199	{
251	/* may be during global destruction */	200	/* may be during global destruction */
252	if (SvREFCNT (padlist))	201	if (SvREFCNT (padlist))
253	{	202	{
254	I32 i = AvFILLp (padlist);	203	I32 i = AvFILLp (padlist);
…		…
267		216
268	SvREFCNT_dec ((SV*)padlist);	217	SvREFCNT_dec ((SV*)padlist);
269	}	218	}
270	}	219	}
271		220
272	STATIC int	221	static int
273	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)	222	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
274	{	223	{
275	AV *padlist;	224	AV *padlist;
276	AV *av = (AV *)mg->mg_obj;	225	AV *av = (AV *)mg->mg_obj;
277		226
278	/* casting is fun. */	227	/* casting is fun. */
279	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	228	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
280	free_padlist (aTHX_ padlist);	229	free_padlist (padlist);
281		230
282	SvREFCNT_dec (av);	231	SvREFCNT_dec (av);
		232
		233	return 0;
283	}	234	}
284		235
285	#define PERL_MAGIC_coro PERL_MAGIC_ext	236	#define PERL_MAGIC_coro PERL_MAGIC_ext
286		237
287	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	238	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
288		239
		240	#define CORO_MAGIC(cv) \
		241	SvMAGIC (cv) \
		242	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		243	? SvMAGIC (cv) \
		244	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		245	: 0
		246
289	/* the next two functions merely cache the padlists */	247	/* the next two functions merely cache the padlists */
290	STATIC void	248	static void
291	get_padlist (pTHX_ CV *cv)	249	get_padlist (CV *cv)
292	{	250	{
293	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	251	MAGIC *mg = CORO_MAGIC (cv);
		252	AV *av;
294		253
295	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	254	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
296	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	255	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
297	else	256	else
		257	{
		258	#if 0
		259	/* this is probably cleaner, but also slower? */
		260	CV *cp = Perl_cv_clone (cv);
		261	CvPADLIST (cv) = CvPADLIST (cp);
		262	CvPADLIST (cp) = 0;
		263	SvREFCNT_dec (cp);
		264	#else
298	CvPADLIST (cv) = clone_padlist (aTHX_ CvPADLIST (cv));	265	CvPADLIST (cv) = coro_clone_padlist (cv);
		266	#endif
		267	}
299	}	268	}
300		269
301	STATIC void	270	static void
302	put_padlist (pTHX_ CV *cv)	271	put_padlist (CV *cv)
303	{	272	{
304	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	273	MAGIC *mg = CORO_MAGIC (cv);
		274	AV *av;
305		275
306	if (!mg)	276	if (!mg)
307	{	277	{
308	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	278	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
309	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
310	mg->mg_virtual = &vtbl_coro;	280	mg->mg_virtual = &vtbl_coro;
311	mg->mg_obj = (SV *)newAV ();	281	mg->mg_obj = (SV *)newAV ();
312	}	282	}
313		283
314	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	284	av = (AV *)mg->mg_obj;
		285
		286	if (AvFILLp (av) >= AvMAX (av))
		287	av_extend (av, AvMAX (av) + 1);
		288
		289	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
315	}	290	}
316		291
317	#define SB do {	292	#define SB do {
318	#define SE } while (0)	293	#define SE } while (0)
319		294
320	#define LOAD(state) load_state(aTHX_ (state));
321	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
322
323	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	295	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
324		296
325	static void	297	static void
326	load_state(pTHX_ Coro__State c)	298	load_perl (Coro__State c)
327	{	299	{
328	PL_dowarn = c->dowarn;	300	#define VAR(name,type) PL_ ## name = c->name;
329	PL_in_eval = c->in_eval;	301	# include "state.h"
330		302	#undef VAR
331	PL_curstackinfo = c->curstackinfo;
332	PL_curstack = c->curstack;
333	PL_mainstack = c->mainstack;
334	PL_stack_sp = c->stack_sp;
335	PL_op = c->op;
336	PL_curpad = c->curpad;
337	PL_comppad = c->comppad;
338	PL_compcv = c->compcv;
339	PL_stack_base = c->stack_base;
340	PL_stack_max = c->stack_max;
341	PL_tmps_stack = c->tmps_stack;
342	PL_tmps_floor = c->tmps_floor;
343	PL_tmps_ix = c->tmps_ix;
344	PL_tmps_max = c->tmps_max;
345	PL_markstack = c->markstack;
346	PL_markstack_ptr = c->markstack_ptr;
347	PL_markstack_max = c->markstack_max;
348	PL_scopestack = c->scopestack;
349	PL_scopestack_ix = c->scopestack_ix;
350	PL_scopestack_max = c->scopestack_max;
351	PL_savestack = c->savestack;
352	PL_savestack_ix = c->savestack_ix;
353	PL_savestack_max = c->savestack_max;
354	PL_retstack = c->retstack;
355	PL_retstack_ix = c->retstack_ix;
356	PL_retstack_max = c->retstack_max;
357	PL_curpm = c->curpm;
358	PL_curcop = c->curcop;
359	PL_top_env = c->top_env;
360		303
361	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	304	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
362	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	305	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
363	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	306	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		307	if (c->irssv)
		308	{
		309	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		310	SvREFCNT_dec (c->irssv);
		311	else
		312	{
		313	REPLACE_SV (PL_rs, c->irssv);
		314	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		315	sv_setsv (c->irssv_sv, PL_rs);
		316	}
		317	}
364		318
365	{	319	{
366	dSP;	320	dSP;
367	CV *cv;	321	CV *cv;
368		322
369	/* now do the ugly restore mess */	323	/* now do the ugly restore mess */
370	while ((cv = (CV *)POPs))	324	while ((cv = (CV *)POPs))
371	{	325	{
372	AV *padlist = (AV *)POPs;
373
374	if (padlist)
375	{
376	put_padlist (aTHX_ cv); /* mark this padlist as available */	326	put_padlist (cv); /* mark this padlist as available */
377	CvPADLIST(cv) = padlist;	327	CvDEPTH (cv) = PTR2IV (POPs);
378	}	328	CvPADLIST (cv) = (AV *)POPs;
379
380	++CvDEPTH(cv);
381	}	329	}
382		330
383	PUTBACK;	331	PUTBACK;
384	}	332	}
385	}	333	}
386		334
387	static void	335	static void
388	save_state(pTHX_ Coro__State c, int flags)	336	save_perl (Coro__State c)
389	{	337	{
390	{	338	{
391	dSP;	339	dSP;
392	I32 cxix = cxstack_ix;	340	I32 cxix = cxstack_ix;
393	PERL_CONTEXT *ccstk = cxstack;	341	PERL_CONTEXT *ccstk = cxstack;
…		…
404	{	352	{
405	while (cxix >= 0)	353	while (cxix >= 0)
406	{	354	{
407	PERL_CONTEXT *cx = &ccstk[cxix--];	355	PERL_CONTEXT *cx = &ccstk[cxix--];
408		356
409	if (CxTYPE(cx) == CXt_SUB)	357	if (CxTYPE (cx) == CXt_SUB)
410	{	358	{
411	CV *cv = cx->blk_sub.cv;	359	CV *cv = cx->blk_sub.cv;
		360
412	if (CvDEPTH(cv))	361	if (CvDEPTH (cv))
413	{	362	{
414	EXTEND (SP, CvDEPTH(cv)*2);	363	EXTEND (SP, 3);
415		364
416	while (--CvDEPTH(cv))
417	{
418	/* this tells the restore code to increment CvDEPTH */
419	PUSHs (Nullsv);
420	PUSHs ((SV *)cv);
421	}
422
423	PUSHs ((SV *)CvPADLIST(cv));	365	PUSHs ((SV *)CvPADLIST (cv));
		366	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
424	PUSHs ((SV *)cv);	367	PUSHs ((SV *)cv);
425		368
426	get_padlist (aTHX_ cv); /* this is a monster */	369	CvDEPTH (cv) = 0;
		370	get_padlist (cv);
427	}	371	}
428	}	372	}
429	#ifdef CXt_FORMAT	373	#ifdef CXt_FORMAT
430	else if (CxTYPE(cx) == CXt_FORMAT)	374	else if (CxTYPE (cx) == CXt_FORMAT)
431	{	375	{
432	/* I never used formats, so how should I know how these are implemented? */	376	/* I never used formats, so how should I know how these are implemented? */
433	/* my bold guess is as a simple, plain sub... */	377	/* my bold guess is as a simple, plain sub... */
434	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	378	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
435	}	379	}
…		…
445	}	389	}
446		390
447	PUTBACK;	391	PUTBACK;
448	}	392	}
449		393
450	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	394	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
451	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	395	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
452	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	396	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		397	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
453		398
454	c->dowarn = PL_dowarn;	399	#define VAR(name,type)c->name = PL_ ## name;
455	c->in_eval = PL_in_eval;	400	# include "state.h"
456		401	#undef VAR
457	c->curstackinfo = PL_curstackinfo;
458	c->curstack = PL_curstack;
459	c->mainstack = PL_mainstack;
460	c->stack_sp = PL_stack_sp;
461	c->op = PL_op;
462	c->curpad = PL_curpad;
463	c->comppad = PL_comppad;
464	c->compcv = PL_compcv;
465	c->stack_base = PL_stack_base;
466	c->stack_max = PL_stack_max;
467	c->tmps_stack = PL_tmps_stack;
468	c->tmps_floor = PL_tmps_floor;
469	c->tmps_ix = PL_tmps_ix;
470	c->tmps_max = PL_tmps_max;
471	c->markstack = PL_markstack;
472	c->markstack_ptr = PL_markstack_ptr;
473	c->markstack_max = PL_markstack_max;
474	c->scopestack = PL_scopestack;
475	c->scopestack_ix = PL_scopestack_ix;
476	c->scopestack_max = PL_scopestack_max;
477	c->savestack = PL_savestack;
478	c->savestack_ix = PL_savestack_ix;
479	c->savestack_max = PL_savestack_max;
480	c->retstack = PL_retstack;
481	c->retstack_ix = PL_retstack_ix;
482	c->retstack_max = PL_retstack_max;
483	c->curpm = PL_curpm;
484	c->curcop = PL_curcop;
485	c->top_env = PL_top_env;
486	}	402	}
487		403
488	/*	404	/*
489	* allocate various perl stacks. This is an exact copy	405	* allocate various perl stacks. This is an exact copy
490	* of perl.c:init_stacks, except that it uses less memory	406	* of perl.c:init_stacks, except that it uses less memory
491	* on the (sometimes correct) assumption that coroutines do	407	* on the (sometimes correct) assumption that coroutines do
492	* not usually need a lot of stackspace.	408	* not usually need a lot of stackspace.
493	*/	409	*/
494	STATIC void	410	static void
495	coro_init_stacks (pTHX)	411	coro_init_stacks ()
496	{	412	{
497	LOCK;
498
499	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	413	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
500	PL_curstackinfo->si_type = PERLSI_MAIN;	414	PL_curstackinfo->si_type = PERLSI_MAIN;
501	PL_curstack = PL_curstackinfo->si_stack;	415	PL_curstack = PL_curstackinfo->si_stack;
502	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	416	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
503		417
504	PL_stack_base = AvARRAY(PL_curstack);	418	PL_stack_base = AvARRAY(PL_curstack);
505	PL_stack_sp = PL_stack_base;	419	PL_stack_sp = PL_stack_base;
506	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	420	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
507		421
508	New(50,PL_tmps_stack,96,SV*);	422	New(50,PL_tmps_stack,128,SV*);
509	PL_tmps_floor = -1;	423	PL_tmps_floor = -1;
510	PL_tmps_ix = -1;	424	PL_tmps_ix = -1;
511	PL_tmps_max = 96;	425	PL_tmps_max = 128;
512		426
513	New(54,PL_markstack,16,I32);	427	New(54,PL_markstack,32,I32);
514	PL_markstack_ptr = PL_markstack;	428	PL_markstack_ptr = PL_markstack;
515	PL_markstack_max = PL_markstack + 16;	429	PL_markstack_max = PL_markstack + 32;
516		430
517	#ifdef SET_MARK_OFFSET	431	#ifdef SET_MARK_OFFSET
518	SET_MARK_OFFSET;	432	SET_MARK_OFFSET;
519	#endif	433	#endif
520		434
521	New(54,PL_scopestack,16,I32);	435	New(54,PL_scopestack,32,I32);
522	PL_scopestack_ix = 0;	436	PL_scopestack_ix = 0;
523	PL_scopestack_max = 16;	437	PL_scopestack_max = 32;
524		438
525	New(54,PL_savestack,96,ANY);	439	New(54,PL_savestack,64,ANY);
526	PL_savestack_ix = 0;	440	PL_savestack_ix = 0;
527	PL_savestack_max = 96;	441	PL_savestack_max = 64;
528		442
		443	#if !PERL_VERSION_ATLEAST (5,9,0)
529	New(54,PL_retstack,8,OP*);	444	New(54,PL_retstack,16,OP*);
530	PL_retstack_ix = 0;	445	PL_retstack_ix = 0;
531	PL_retstack_max = 8;	446	PL_retstack_max = 16;
532		447	#endif
533	UNLOCK;
534	}	448	}
535		449
536	/*	450	/*
537	* destroy the stacks, the callchain etc...	451	* destroy the stacks, the callchain etc...
538	*/	452	*/
539	STATIC void	453	static void
540	destroy_stacks(pTHX)	454	coro_destroy_stacks ()
541	{	455	{
542	if (!IN_DESTRUCT)	456	if (!IN_DESTRUCT)
543	{	457	{
544	/* is this ugly, I ask? */	458	/* is this ugly, I ask? */
545	LEAVE_SCOPE (0);	459	LEAVE_SCOPE (0);
…		…
576		490
577	Safefree (PL_tmps_stack);	491	Safefree (PL_tmps_stack);
578	Safefree (PL_markstack);	492	Safefree (PL_markstack);
579	Safefree (PL_scopestack);	493	Safefree (PL_scopestack);
580	Safefree (PL_savestack);	494	Safefree (PL_savestack);
		495	#if !PERL_VERSION_ATLEAST (5,9,0)
581	Safefree (PL_retstack);	496	Safefree (PL_retstack);
582	}
583
584	static void
585	allocate_stack (Coro__State ctx, int alloc)
586	{
587	coro_stack *stack;
588
589	New (0, stack, 1, coro_stack);
590
591	stack->refcnt = 1;
592	stack->usecnt = 1;
593	stack->gencnt = ctx->gencnt = 0;
594
595	if (alloc)
596	{
597	#if HAVE_MMAP
598	stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */
599	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
600	if (stack->sptr == (void *)-1)
601	#endif	497	#endif
602	{
603	/*FIXME*//*D*//* reasonable stack size! */
604	stack->ssize = - (STACKSIZE * sizeof (long));
605	New (0, stack->sptr, STACKSIZE, long);
606	}
607	}
608	else
609	stack->sptr = 0;
610
611	ctx->stack = stack;
612	}	498	}
613		499
614	static void	500	static void
615	deallocate_stack (Coro__State ctx)	501	setup_coro (struct coro *coro)
616	{
617	coro_stack *stack = ctx->stack;
618
619	ctx->stack = 0;
620
621	if (stack)
622	{
623	if (!--stack->refcnt)
624	{
625	#ifdef HAVE_MMAP
626	if (stack->ssize > 0 && stack->sptr)
627	munmap (stack->sptr, stack->ssize);
628	else
629	#endif
630	Safefree (stack->sptr);
631
632	Safefree (stack);
633	}
634	else if (ctx->gencnt == stack->gencnt)
635	--stack->usecnt;
636	}
637	}
638
639	static void
640	setup_coro (void *arg)
641	{	502	{
642	/*	503	/*
643	* emulate part of the perl startup here.	504	* emulate part of the perl startup here.
644	*/	505	*/
645	dTHX;
646	dSP;
647	Coro__State ctx = (Coro__State)arg;
648	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
649		506
650	coro_init_stacks (aTHX);	507	coro_init_stacks ();
651	/*PL_curcop = 0;*/	508
652	/*PL_in_eval = PL_in_eval;*/ /* inherit */	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
653	SvREFCNT_dec (GvAV (PL_defgv));	520	SvREFCNT_dec (GvAV (PL_defgv));
654	GvAV (PL_defgv) = ctx->args; ctx->args = 0;	521	GvAV (PL_defgv) = coro->args; coro->args = 0;
655		522
656	SPAGAIN;
657
658	if (ctx->stack)
659	{
660	ctx->cursp = 0;
661
662	PUSHMARK(SP);
663	PUTBACK;
664	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
665
666	if (SvTRUE (ERRSV))
667	croak (NULL);
668	else
669	croak ("FATAL: CCTXT coroutine returned!");
670	}
671	else
672	{
673	UNOP myop;
674
675	PL_op = (OP *)&myop;
676
677	Zero(&myop, 1, UNOP);	523	Zero (&myop, 1, LOGOP);
678	myop.op_next = Nullop;	524	myop.op_next = Nullop;
679	myop.op_flags = OPf_WANT_VOID;	525	myop.op_flags = OPf_WANT_VOID;
680		526
681	PUSHMARK(SP);	527	PUSHMARK (SP);
682	XPUSHs (sub_init);	528	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
683	/*
684	* the next line is slightly wrong, as PL_op->op_next
685	* is actually being executed so we skip the first op.
686	* that doesn't matter, though, since it is only
687	* pp_nextstate and we never return...
688	* ah yes, and I don't care anyways ;)
689	*/
690	PUTBACK;	529	PUTBACK;
		530	PL_op = (OP *)&myop;
691	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	531	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
692	SPAGAIN;	532	SPAGAIN;
		533	}
693		534
694	ENTER; /* necessary e.g. for dounwind */	535	ENTER; /* necessary e.g. for dounwind */
695	}
696	}	536	}
697		537
698	static void	538	static void
699	continue_coro (void *arg)	539	free_coro_mortal ()
700	{	540	{
701	/*
702	* this is a _very_ stripped down perl interpreter ;)
703	*/
704	dTHX;
705	Coro__State ctx = (Coro__State)arg;
706	JMPENV coro_start_env;
707
708	PL_top_env = &ctx->start_env;
709
710	ctx->cursp = 0;
711	PL_op = PL_op->op_next;
712	CALLRUNOPS(aTHX);
713
714	abort ();
715	}
716
717	STATIC void
718	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)
719	{
720	dSTACKLEVEL;
721
722	if (prev != next)
723	{
724	if (next->mainstack)
725	{
726	LOCK;
727	SAVE (prev, flags);
728	LOAD (next);
729	UNLOCK;
730
731	/* mark this state as in-use */
732	next->mainstack = 0;
733	next->tmps_ix = -2;
734
735	/* stacklevel changed? if yes, grab the stack for us! */
736	if (flags & TRANSFER_SAVE_CCTXT)
737	{
738	if (!prev->stack)
739	allocate_stack (prev, 0);
740	else if (prev->cursp != stacklevel
741	&& prev->stack->usecnt > 1)
742	{
743	prev->gencnt = ++prev->stack->gencnt;
744	prev->stack->usecnt = 1;
745	}
746
747	/* has our stack been invalidated? */
748	if (next->stack && next->stack->gencnt != next->gencnt)
749	{
750	deallocate_stack (next);
751	allocate_stack (next, 1);
752	coro_create (&(next->stack->cctx),
753	continue_coro, (void *)next,
754	next->stack->sptr, labs (next->stack->ssize));
755	}
756
757	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
758	prev->cursp = stacklevel;
759	/* don't add any code here */
760	}
761	else
762	next->cursp = stacklevel;
763	}
764	else if (next->tmps_ix == -2)
765	croak ("tried to transfer to running coroutine");
766	else
767	{
768	LOCK;
769	SAVE (prev, -1); /* first get rid of the old state */
770	UNLOCK;
771
772	if (flags & TRANSFER_SAVE_CCTXT)
773	{
774	if (!prev->stack)
775	allocate_stack (prev, 0);
776
777	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
778	{
779	PL_top_env = &next->start_env;
780
781	setup_coro (next);
782	next->cursp = stacklevel;
783
784	prev->stack->refcnt++;
785	prev->stack->usecnt++;
786	next->stack = prev->stack;
787	next->gencnt = prev->gencnt;
788	}
789	else
790	{
791	assert (!next->stack);
792	allocate_stack (next, 1);
793	coro_create (&(next->stack->cctx),
794	setup_coro, (void *)next,
795	next->stack->sptr, labs (next->stack->ssize));
796	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
797	prev->cursp = stacklevel;
798	/* don't add any code here */
799	}
800	}
801	else
802	{
803	setup_coro (next);
804	next->cursp = stacklevel;
805	}
806	}
807	}
808
809	LOCK;
810	if (coro_mortal)	541	if (coro_mortal)
811	{	542	{
812	SvREFCNT_dec (coro_mortal);	543	SvREFCNT_dec (coro_mortal);
813	coro_mortal = 0;	544	coro_mortal = 0;
814	}	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	{
		552	dSP;
		553	LOGOP myop;
		554
		555	Zero (&myop, 1, LOGOP);
		556	myop.op_next = PL_op;
		557	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		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);
		566	SPAGAIN;
		567	}
		568
		569	static void
		570	coro_run (void *arg)
		571	{
		572	/* coro_run is the alternative tail of transfer(), so unlock here. */
815	UNLOCK;	573	UNLOCK;
816	}
817		574
818	#define SV_CORO(sv,func) \	575	/*
819	do { \	576	* this is a _very_ stripped down perl interpreter ;)
820	if (SvROK (sv)) \	577	*/
821	sv = SvRV (sv); \	578	PL_top_env = &PL_start_env;
822	\
823	if (SvTYPE (sv) == SVt_PVHV) \
824	{ \
825	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
826	\
827	if (!he) \
828	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
829	\
830	(sv) = SvRV (HeVAL(he)); \
831	} \
832	\
833	/* must also be changed inside Coro::Cont::yield */ \
834	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
835	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
836	\
837	} while(0)
838		579
839	#define SvSTATE(sv) (struct coro *)SvIV (sv)	580	/* inject call to cctx_init */
		581	prepare_cctx ((coro_cctx *)arg);
840		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);
		588	abort ();
		589	}
		590
		591	static coro_cctx *
		592	cctx_new ()
		593	{
		594	coro_cctx *cctx;
		595
		596	++cctx_count;
		597
		598	New (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
		703	transfer (struct coro *prev, struct coro *next)
		704	{
		705	dSTACKLEVEL;
		706
		707	/* sometimes transfer is only called to set idle_sp */
		708	if (!next)
		709	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		710	else if (prev != next)
		711	{
		712	coro_cctx *prev__cctx;
		713
		714	if (prev->flags & CF_NEW)
		715	{
		716	/* create a new empty context */
		717	Newz (0, prev->cctx, 1, coro_cctx);
		718	prev->cctx->inuse = 1;
		719	prev->flags &= ~CF_NEW;
		720	prev->flags |= CF_RUNNING;
		721	}
		722
		723	/*TODO: must not croak here */
		724	if (!prev->flags & CF_RUNNING)
		725	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		726
		727	if (next->flags & CF_RUNNING)
		728	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		729
		730	prev->flags &= ~CF_RUNNING;
		731	next->flags |= CF_RUNNING;
		732
		733	LOCK;
		734
		735	if (next->flags & CF_NEW)
		736	{
		737	/* need to start coroutine */
		738	next->flags &= ~CF_NEW;
		739	/* first get rid of the old state */
		740	save_perl (prev);
		741	/* setup coroutine call */
		742	setup_coro (next);
		743	/* need a new stack */
		744	assert (!next->stack);
		745	}
		746	else
		747	{
		748	/* coroutine already started */
		749	save_perl (prev);
		750	load_perl (next);
		751	}
		752
		753	prev__cctx = prev->cctx;
		754
		755	/* possibly "free" the cctx */
		756	if (prev__cctx->idle_sp == STACKLEVEL)
		757	{
		758	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		759	assert (PL_top_env == prev__cctx->top_env);
		760
		761	prev->cctx = 0;
		762
		763	cctx_put (prev__cctx);
		764	prev__cctx->inuse = 0;
		765	}
		766
		767	if (!next->cctx)
		768	{
		769	next->cctx = cctx_get ();
		770	assert (!next->cctx->inuse);
		771	next->cctx->inuse = 1;
		772	}
		773
		774	if (prev__cctx != next->cctx)
		775	{
		776	prev__cctx->top_env = PL_top_env;
		777	PL_top_env = next->cctx->top_env;
		778	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		779	}
		780
		781	free_coro_mortal ();
		782
		783	UNLOCK;
		784	}
		785	}
		786
		787	struct transfer_args
		788	{
		789	struct coro *prev, *next;
		790	};
		791
		792	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		793
		794	static void
		795	coro_state_destroy (struct coro *coro)
		796	{
		797	if (coro->refcnt--)
		798	return;
		799
		800	if (coro->mainstack && coro->mainstack != main_mainstack)
		801	{
		802	struct coro temp;
		803	Zero (&temp, 1, struct coro);
		804	temp.save = CORO_SAVE_ALL;
		805
		806	if (coro->flags & CF_RUNNING)
		807	croak ("FATAL: tried to destroy currently running coroutine");
		808
		809	save_perl (&temp);
		810	load_perl (coro);
		811
		812	coro_destroy_stacks ();
		813
		814	load_perl (&temp); /* this will get rid of defsv etc.. */
		815
		816	coro->mainstack = 0;
		817	}
		818
		819	cctx_destroy (coro->cctx);
		820	SvREFCNT_dec (coro->args);
		821	Safefree (coro);
		822	}
		823
841	static void	824	static int
		825	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		826	{
		827	struct coro *coro = (struct coro *)mg->mg_ptr;
		828	mg->mg_ptr = 0;
		829
		830	coro_state_destroy (coro);
		831
		832	return 0;
		833	}
		834
		835	static int
		836	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		837	{
		838	struct coro *coro = (struct coro *)mg->mg_ptr;
		839
		840	++coro->refcnt;
		841
		842	return 0;
		843	}
		844
		845	static MGVTBL coro_state_vtbl = {
		846	0, 0, 0, 0,
		847	coro_state_clear,
		848	0,
		849	#ifdef MGf_DUP
		850	coro_state_dup,
		851	#else
		852	# define MGf_DUP 0
		853	#endif
		854	};
		855
		856	static struct coro *
		857	SvSTATE (SV *coro)
		858	{
		859	HV *stash;
		860	MAGIC *mg;
		861
		862	if (SvROK (coro))
		863	coro = SvRV (coro);
		864
		865	stash = SvSTASH (coro);
		866	if (stash != coro_stash && stash != coro_state_stash)
		867	{
		868	/* very slow, but rare, check */
		869	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		870	croak ("Coro::State object required");
		871	}
		872
		873	mg = SvMAGIC (coro);
		874	assert (mg->mg_type == PERL_MAGIC_ext);
		875	return (struct coro *)mg->mg_ptr;
		876	}
		877
		878	static void
		879	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		880	{
		881	ta->prev = SvSTATE (prev_sv);
		882	ta->next = SvSTATE (next_sv);
		883	}
		884
		885	static void
842	api_transfer(pTHX_ SV *prev, SV *next, int flags)	886	api_transfer (SV *prev_sv, SV *next_sv)
843	{	887	{
844	SV_CORO (prev, "Coro::transfer");	888	struct transfer_args ta;
845	SV_CORO (next, "Coro::transfer");
846		889
847	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	890	prepare_transfer (&ta, prev_sv, next_sv);
		891	TRANSFER (ta);
		892	}
		893
		894	static int
		895	api_save (SV *coro_sv, int new_save)
		896	{
		897	struct coro *coro = SvSTATE (coro_sv);
		898	int old_save = coro->save;
		899
		900	if (new_save >= 0)
		901	coro->save = new_save;
		902
		903	return old_save;
848	}	904	}
849		905
850	/** Coro ********************************************************************/	906	/** Coro ********************************************************************/
851		907
852	#define PRIO_MAX 3	908	#define PRIO_MAX 3
…		…
855	#define PRIO_LOW -1	911	#define PRIO_LOW -1
856	#define PRIO_IDLE -3	912	#define PRIO_IDLE -3
857	#define PRIO_MIN -4	913	#define PRIO_MIN -4
858		914
859	/* for Coro.pm */	915	/* for Coro.pm */
860	static GV *coro_current, *coro_idle;	916	static SV *coro_current;
861	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	917	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
862	static int coro_nready;	918	static int coro_nready;
863		919
864	static void	920	static void
865	coro_enq (pTHX_ SV *sv)	921	coro_enq (SV *coro_sv)
866	{	922	{
867	if (SvTYPE (sv) == SVt_PVHV)
868	{
869	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
870	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
871
872	prio = prio > PRIO_MAX ? PRIO_MAX
873	: prio < PRIO_MIN ? PRIO_MIN
874	: prio;
875
876	av_push (coro_ready [prio - PRIO_MIN], sv);	923	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
877	coro_nready++;	924	coro_nready++;
878
879	return;
880	}
881
882	croak ("Coro::ready tried to enqueue something that is not a coroutine");
883	}	925	}
884		926
885	static SV *	927	static SV *
886	coro_deq (pTHX_ int min_prio)	928	coro_deq (int min_prio)
887	{	929	{
888	int prio = PRIO_MAX - PRIO_MIN;	930	int prio = PRIO_MAX - PRIO_MIN;
889		931
890	min_prio -= PRIO_MIN;	932	min_prio -= PRIO_MIN;
891	if (min_prio < 0)	933	if (min_prio < 0)
892	min_prio = 0;	934	min_prio = 0;
893		935
894	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	936	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
895	if (av_len (coro_ready[prio]) >= 0)	937	if (AvFILLp (coro_ready [prio]) >= 0)
896	{	938	{
897	coro_nready--;	939	coro_nready--;
898	return av_shift (coro_ready[prio]);	940	return av_shift (coro_ready [prio]);
899	}	941	}
900		942
901	return 0;	943	return 0;
902	}	944	}
903		945
904	static void	946	static int
905	api_ready (SV *coro)	947	api_ready (SV *coro_sv)
906	{	948	{
907	dTHX;	949	struct coro *coro;
908		950
909	if (SvROK (coro))	951	if (SvROK (coro_sv))
910	coro = SvRV (coro);	952	coro_sv = SvRV (coro_sv);
		953
		954	coro = SvSTATE (coro_sv);
		955
		956	if (coro->flags & CF_READY)
		957	return 0;
		958
		959	#if 0 /* this is actually harmless */
		960	if (coro->flags & CF_RUNNING)
		961	croak ("Coro::ready called on currently running coroutine");
		962	#endif
		963
		964	coro->flags |= CF_READY;
911		965
912	LOCK;	966	LOCK;
913	coro_enq (aTHX_ SvREFCNT_inc (coro));	967	coro_enq (SvREFCNT_inc (coro_sv));
914	UNLOCK;	968	UNLOCK;
		969
		970	return 1;
		971	}
		972
		973	static int
		974	api_is_ready (SV *coro_sv)
		975	{
		976	return !!SvSTATE (coro_sv)->flags & CF_READY;
		977	}
		978
		979	static void
		980	prepare_schedule (struct transfer_args *ta)
		981	{
		982	SV *prev, *next;
		983
		984	for (;;)
		985	{
		986	LOCK;
		987	next = coro_deq (PRIO_MIN);
		988	UNLOCK;
		989
		990	if (next)
		991	break;
		992
		993	{
		994	dSP;
		995
		996	ENTER;
		997	SAVETMPS;
		998
		999	PUSHMARK (SP);
		1000	PUTBACK;
		1001	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1002
		1003	FREETMPS;
		1004	LEAVE;
		1005	}
		1006	}
		1007
		1008	prev = SvRV (coro_current);
		1009	SvRV_set (coro_current, next);
		1010
		1011	/* free this only after the transfer */
		1012	LOCK;
		1013	free_coro_mortal ();
		1014	UNLOCK;
		1015	coro_mortal = prev;
		1016
		1017	assert (!SvROK(prev));//D
		1018	assert (!SvROK(next));//D
		1019
		1020	ta->prev = SvSTATE (prev);
		1021	ta->next = SvSTATE (next);
		1022
		1023	assert (ta->next->flags & CF_READY);
		1024	ta->next->flags &= ~CF_READY;
		1025	}
		1026
		1027	static void
		1028	prepare_cede (struct transfer_args *ta)
		1029	{
		1030	api_ready (coro_current);
		1031
		1032	prepare_schedule (ta);
915	}	1033	}
916		1034
917	static void	1035	static void
918	api_schedule (void)	1036	api_schedule (void)
919	{	1037	{
920	dTHX;	1038	struct transfer_args ta;
921		1039
922	SV *prev, *next;	1040	prepare_schedule (&ta);
923		1041	TRANSFER (ta);
924	LOCK;
925
926	prev = SvRV (GvSV (coro_current));
927	next = coro_deq (aTHX_ PRIO_MIN);
928
929	if (!next)
930	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
931
932	/* free this only after the transfer */
933	coro_mortal = prev;
934	SV_CORO (prev, "Coro::schedule");
935
936	SvRV (GvSV (coro_current)) = next;
937
938	SV_CORO (next, "Coro::schedule");
939
940	UNLOCK;
941
942	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
943	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
944	}	1042	}
945		1043
946	static void	1044	static void
947	api_cede (void)	1045	api_cede (void)
948	{	1046	{
949	dTHX;	1047	struct transfer_args ta;
950		1048
951	LOCK;	1049	prepare_cede (&ta);
952	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1050	TRANSFER (ta);
953	UNLOCK;
954
955	api_schedule ();
956	}	1051	}
957		1052
958	MODULE = Coro::State PACKAGE = Coro::State	1053	MODULE = Coro::State PACKAGE = Coro::State
959		1054
960	PROTOTYPES: ENABLE	1055	PROTOTYPES: DISABLE
961		1056
962	BOOT:	1057	BOOT:
963	{ /* {} necessary for stoopid perl-5.6.x */	1058	{
964	#ifdef USE_ITHREADS	1059	#ifdef USE_ITHREADS
965	MUTEX_INIT (&coro_mutex);	1060	MUTEX_INIT (&coro_mutex);
966	#endif	1061	#endif
		1062	BOOT_PAGESIZE;
967		1063
968	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
969	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
970	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1064	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
971		1065
972	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1066	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
973	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1067	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
974	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1068	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1069	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
975	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1070	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
976		1071
977	main_mainstack = PL_mainstack;	1072	main_mainstack = PL_mainstack;
978		1073
979	coroapi.ver = CORO_API_VERSION;	1074	coroapi.ver = CORO_API_VERSION;
980	coroapi.transfer = api_transfer;	1075	coroapi.transfer = api_transfer;
981	}
982		1076
983	Coro::State	1077	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
984	_newprocess(args)	1078	}
985	SV * args	1079
986	PROTOTYPE: $	1080	SV *
		1081	new (char *klass, ...)
987	CODE:	1082	CODE:
988	Coro__State coro;	1083	{
		1084	struct coro *coro;
		1085	HV *hv;
		1086	int i;
989		1087
990	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
991	croak ("Coro::State::_newprocess expects an arrayref");
992
993	Newz (0, coro, 1, struct coro);	1088	Newz (0, coro, 1, struct coro);
		1089	coro->args = newAV ();
		1090	coro->save = CORO_SAVE_ALL;
		1091	coro->flags = CF_NEW;
994		1092
995	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1093	hv = newHV ();
996	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1094	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
997	/*coro->stack = 0;*/	1095	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
998		1096
999	/* same as JMPENV_BOOTSTRAP */	1097	for (i = 1; i < items; i++)
1000	/* we might be able to recycle start_env, but safe is safe */	1098	av_push (coro->args, newSVsv (ST (i)));
1001	/*Zero(&coro->start_env, 1, JMPENV);*/	1099	}
1002	coro->start_env.je_ret = -1;
1003	coro->start_env.je_mustcatch = TRUE;
1004
1005	RETVAL = coro;
1006	OUTPUT:	1100	OUTPUT:
1007	RETVAL	1101	RETVAL
1008		1102
		1103	int
		1104	save (SV *coro, int new_save = -1)
		1105	CODE:
		1106	RETVAL = api_save (coro, new_save);
		1107	OUTPUT:
		1108	RETVAL
		1109
1009	void	1110	void
1010	transfer(prev, next, flags)	1111	_set_stacklevel (...)
1011	SV *prev	1112	ALIAS:
1012	SV *next	1113	Coro::State::transfer = 1
1013	int flags	1114	Coro::schedule = 2
1014	PROTOTYPE: @	1115	Coro::cede = 3
1015	CODE:	1116	CODE:
1016	PUTBACK;	1117	{
1017	SV_CORO (next, "Coro::transfer");	1118	struct transfer_args ta;
1018	SV_CORO (prev, "Coro::transfer");	1119
1019	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1120	switch (ix)
1020	SPAGAIN;	1121	{
		1122	case 0:
		1123	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1124	ta.next = 0;
		1125	break;
		1126
		1127	case 1:
		1128	if (items != 2)
		1129	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1130
		1131	prepare_transfer (&ta, ST (0), ST (1));
		1132	break;
		1133
		1134	case 2:
		1135	prepare_schedule (&ta);
		1136	break;
		1137
		1138	case 3:
		1139	prepare_cede (&ta);
		1140	break;
		1141	}
		1142
		1143	TRANSFER (ta);
		1144	}
1021		1145
1022	void	1146	void
1023	DESTROY(coro)	1147	_clone_state_from (SV *dst, SV *src)
1024	Coro::State coro	1148	CODE:
1025	CODE:	1149	{
		1150	struct coro *coro_src = SvSTATE (src);
1026		1151
1027	if (coro->mainstack && coro->mainstack != main_mainstack)	1152	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1028	{
1029	struct coro temp;
1030		1153
1031	PUTBACK;	1154	++coro_src->refcnt;
1032	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1155	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1033	LOAD (aTHX_ coro);	1156	}
1034	SPAGAIN;
1035
1036	destroy_stacks (aTHX);
1037
1038	LOAD ((&temp)); /* this will get rid of defsv etc.. */
1039	SPAGAIN;
1040
1041	coro->mainstack = 0;
1042	}
1043
1044	deallocate_stack (coro);
1045	SvREFCNT_dec (coro->args);
1046	Safefree (coro);
1047		1157
1048	void	1158	void
1049	_exit(code)	1159	_exit (code)
1050	int code	1160	int code
1051	PROTOTYPE: $	1161	PROTOTYPE: $
1052	CODE:	1162	CODE:
1053	_exit (code);	1163	_exit (code);
1054		1164
1055	MODULE = Coro::State PACKAGE = Coro::Cont	1165	int
		1166	cctx_count ()
		1167	CODE:
		1168	RETVAL = cctx_count;
		1169	OUTPUT:
		1170	RETVAL
1056		1171
1057	# this is slightly dirty (should expose a c-level api)	1172	int
1058		1173	cctx_idle ()
1059	void	1174	CODE:
1060	yield(...)	1175	RETVAL = cctx_idle;
1061	PROTOTYPE: @	1176	OUTPUT:
1062	CODE:	1177	RETVAL
1063	SV *yieldstack;
1064	SV *sv;
1065	AV *defav = GvAV (PL_defgv);
1066	struct coro *prev, *next;
1067
1068	yieldstack = *hv_fetch (
1069	(HV *)SvRV (GvSV (coro_current)),
1070	"yieldstack", sizeof ("yieldstack") - 1,
1071	0
1072	);
1073
1074	/* set up @_ -- ugly */
1075	av_clear (defav);
1076	av_fill (defav, items - 1);
1077	while (items--)
1078	av_store (defav, items, SvREFCNT_inc (ST(items)));
1079
1080	sv = av_pop ((AV *)SvRV (yieldstack));
1081	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1082	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1083	SvREFCNT_dec (sv);
1084
1085	transfer (aTHX_ prev, next, 0);
1086		1178
1087	MODULE = Coro::State PACKAGE = Coro	1179	MODULE = Coro::State PACKAGE = Coro
1088		1180
1089	# this is slightly dirty (should expose a c-level api)
1090
1091	BOOT:	1181	BOOT:
1092	{	1182	{
1093	int i;	1183	int i;
		1184
1094	HV *stash = gv_stashpv ("Coro", TRUE);	1185	coro_stash = gv_stashpv ("Coro", TRUE);
1095		1186
1096	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1187	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1097	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1188	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1098	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1189	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1099	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1190	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1100	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1191	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1101	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1192	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1102		1193
1103	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1194	coro_current = get_sv ("Coro::current", FALSE);
1104	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1195	SvREADONLY_on (coro_current);
1105		1196
1106	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1197	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1107	coro_ready[i] = newAV ();	1198	coro_ready[i] = newAV ();
1108		1199
1109	{	1200	{
1110	SV *sv = perl_get_sv("Coro::API", 1);	1201	SV *sv = perl_get_sv("Coro::API", 1);
1111		1202
1112	coroapi.schedule = api_schedule;	1203	coroapi.schedule = api_schedule;
		1204	coroapi.save = api_save;
1113	coroapi.cede = api_cede;	1205	coroapi.cede = api_cede;
1114	coroapi.ready = api_ready;	1206	coroapi.ready = api_ready;
		1207	coroapi.is_ready = api_is_ready;
1115	coroapi.nready = &coro_nready;	1208	coroapi.nready = &coro_nready;
1116	coroapi.current = coro_current;	1209	coroapi.current = coro_current;
1117		1210
1118	GCoroAPI = &coroapi;	1211	GCoroAPI = &coroapi;
1119	sv_setiv(sv, (IV)&coroapi);	1212	sv_setiv (sv, (IV)&coroapi);
1120	SvREADONLY_on(sv);	1213	SvREADONLY_on (sv);
1121	}	1214	}
1122	}	1215	}
1123		1216
1124	#if !PERL_MICRO
1125
1126	void	1217	void
1127	ready(self)	1218	_set_current (SV *current)
1128	SV * self
1129	PROTOTYPE: $	1219	PROTOTYPE: $
1130	CODE:	1220	CODE:
1131	api_ready (self);	1221	SvREFCNT_dec (SvRV (coro_current));
1132		1222	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1133	#endif
1134		1223
1135	int	1224	int
		1225	prio (Coro::State coro, int newprio = 0)
		1226	ALIAS:
		1227	nice = 1
		1228	CODE:
		1229	{
		1230	RETVAL = coro->prio;
		1231
		1232	if (items > 1)
		1233	{
		1234	if (ix)
		1235	newprio += coro->prio;
		1236
		1237	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1238	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1239
		1240	coro->prio = newprio;
		1241	}
		1242	}
		1243
		1244	SV *
		1245	ready (SV *self)
		1246	PROTOTYPE: $
		1247	CODE:
		1248	RETVAL = boolSV (api_ready (self));
		1249	OUTPUT:
		1250	RETVAL
		1251
		1252	SV *
		1253	is_ready (SV *self)
		1254	PROTOTYPE: $
		1255	CODE:
		1256	RETVAL = boolSV (api_is_ready (self));
		1257	OUTPUT:
		1258	RETVAL
		1259
		1260	int
1136	nready(...)	1261	nready (...)
1137	PROTOTYPE:	1262	PROTOTYPE:
1138	CODE:	1263	CODE:
1139	RETVAL = coro_nready;	1264	RETVAL = coro_nready;
1140	OUTPUT:	1265	OUTPUT:
1141	RETVAL	1266	RETVAL
1142		1267
		1268	MODULE = Coro::State PACKAGE = Coro::AIO
		1269
		1270	SV *
		1271	_get_state ()
		1272	CODE:
		1273	{
		1274	struct io_state *data;
		1275
		1276	RETVAL = newSV (sizeof (struct io_state));
		1277	data = (struct io_state *)SvPVX (RETVAL);
		1278	SvCUR_set (RETVAL, sizeof (struct io_state));
		1279	SvPOK_only (RETVAL);
		1280
		1281	data->errorno = errno;
		1282	data->laststype = PL_laststype;
		1283	data->laststatval = PL_laststatval;
		1284	data->statcache = PL_statcache;
		1285	}
		1286	OUTPUT:
		1287	RETVAL
		1288
1143	void	1289	void
1144	schedule(...)	1290	_set_state (char *data_)
1145	PROTOTYPE:	1291	PROTOTYPE: $
1146	CODE:	1292	CODE:
1147	api_schedule ();	1293	{
		1294	struct io_state *data = (void *)data_;
1148		1295
1149	void	1296	errno = data->errorno;
1150	cede(...)	1297	PL_laststype = data->laststype;
1151	PROTOTYPE:	1298	PL_laststatval = data->laststatval;
1152	CODE:	1299	PL_statcache = data->statcache;
1153	api_cede ();	1300	}
1154		1301

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