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Comparing Coro/Coro/State.xs (file contents):
Revision 1.22 by root, Sat Aug 11 23:10:56 2001 UTC vs.
Revision 1.127 by root, Tue Dec 12 13:56:45 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
6		8
7	#include <signal.h>	9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
8		12
9	#ifdef HAVE_MMAP	13	#ifdef HAVE_MMAP
10	# include <unistd.h>	14	# include <unistd.h>
11	# include <sys/mman.h>	15	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	16	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
15	# else	19	# else
16	# undef HAVE_MMAP	20	# undef HAVE_MMAP
17	# endif	21	# endif
18	# endif	22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
19	#endif	30	# endif
20
21	#define MAY_FLUSH /* increases codesize */
22
23	/* perl-related */
24	#define TRANSFER_SAVE_DEFAV 0x00000001
25	#define TRANSFER_SAVE_DEFSV 0x00000002
26	#define TRANSFER_SAVE_ERRSV 0x00000004
27	/* c-related */
28	#define TRANSFER_SAVE_CCTXT 0x00000008
29	#ifdef CORO_LAZY_STACK
30	# define TRANSFER_LAZY_STACK 0x00000010
31	#else	31	#else
32	# define TRANSFER_LAZY_STACK 0x00000000	32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
		50	# ifndef PL_ppaddr
		51	# define PL_ppaddr ppaddr
33	#endif	52	# endif
		53	# ifndef call_sv
		54	# define call_sv perl_call_sv
		55	# endif
		56	# ifndef get_sv
		57	# define get_sv perl_get_sv
		58	# endif
		59	# ifndef get_cv
		60	# define get_cv perl_get_cv
		61	# endif
		62	# ifndef IS_PADGV
		63	# define IS_PADGV(v) 0
		64	# endif
		65	# ifndef IS_PADCONST
		66	# define IS_PADCONST(v) 0
		67	# endif
		68	#endif
34		69
35	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	70	/* 5.8.7 */
36	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
37		74
38	#define SUB_INIT "Coro::State::initialize"	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
39	#define UCORO_STATE "_coro_state"	76	# undef STACKGUARD
		77	#endif
40		78
		79	#ifndef STACKGUARD
		80	# define STACKGUARD 0
		81	#endif
		82
		83	/* prefer perl internal functions over our own? */
		84	#ifndef PREFER_PERL_FUNCTIONS
		85	# define PREFER_PERL_FUNCTIONS 0
		86	#endif
		87
41	/* The next macro should delcare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
42	* to the current C stack pointer. It's property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
43	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
44	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
45		93
46	#define labs(l) ((l) >= 0 ? (l) : -(l))	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
47		95
48	/* this is actually not only the c stack but also c registers etc... */	96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	#else
		99	# define attribute(x)
		100	#endif
		101
		102	#define NOINLINE attribute ((noinline))
		103
		104	#include "CoroAPI.h"
		105
		106	#ifdef USE_ITHREADS
		107	static perl_mutex coro_mutex;
		108	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		109	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		110	#else
		111	# define LOCK (void)0
		112	# define UNLOCK (void)0
		113	#endif
		114
		115	struct io_state
		116	{
		117	int errorno;
		118	I32 laststype;
		119	int laststatval;
		120	Stat_t statcache;
		121	};
		122
		123	static struct CoroAPI coroapi;
		124	static AV *main_mainstack; /* used to differentiate between $main and others */
		125	static HV *coro_state_stash, *coro_stash;
		126	static SV *coro_mortal; /* will be freed after next transfer */
		127
		128	static struct coro_cctx *cctx_first;
		129	static int cctx_count, cctx_idle;
		130
		131	/* this is a structure representing a c-level coroutine */
49	typedef struct {	132	typedef struct coro_cctx {
50	int refcnt; /* pointer reference counter */	133	struct coro_cctx *next;
51	int usecnt; /* shared by how many coroutines */
52	int gencnt; /* generation counter */
53		134
54	coro_context cctx;	135	/* the stack */
55
56	void *sptr;	136	void *sptr;
57	long ssize; /* positive == mmap, otherwise malloc */	137	long ssize; /* positive == mmap, otherwise malloc */
58	} coro_stack;
59		138
		139	/* cpu state */
		140	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		141	JMPENV *top_env;
		142	coro_context cctx;
		143
		144	int inuse;
		145
		146	#if USE_VALGRIND
		147	int valgrind_id;
		148	#endif
		149	} coro_cctx;
		150
		151	enum {
		152	CF_RUNNING = 0x0001, /* coroutine is running */
		153	CF_READY = 0x0002, /* coroutine is ready */
		154	CF_NEW = 0x0004, /* ahs never been switched to */
		155	};
		156
		157	/* this is a structure representing a perl-level coroutine */
60	struct coro {	158	struct coro {
61	/* the optional C context */	159	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	160	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65
66	/* optionally saved, might be zero */
67	AV *defav;
68	SV *defsv;
69	SV *errsv;
70
71	/* saved global state not related to stacks */
72	U8 dowarn;
73	I32 in_eval;
74
75	/* the stacks and related info (callchain etc..) */
76	PERL_SI *curstackinfo;
77	AV *curstack;
78	AV *mainstack;
79	SV **stack_sp;
80	OP *op;
81	SV **curpad;
82	SV **stack_base;
83	SV **stack_max;
84	SV **tmps_stack;
85	I32 tmps_floor;
86	I32 tmps_ix;
87	I32 tmps_max;
88	I32 *markstack;
89	I32 *markstack_ptr;
90	I32 *markstack_max;
91	I32 *scopestack;
92	I32 scopestack_ix;
93	I32 scopestack_max;
94	ANY *savestack;
95	I32 savestack_ix;
96	I32 savestack_max;
97	OP **retstack;
98	I32 retstack_ix;
99	I32 retstack_max;
100	COP *curcop;
101	JMPENV *top_env;
102		161
103	/* data associated with this coroutine (initial args) */	162	/* data associated with this coroutine (initial args) */
104	AV *args;	163	AV *args;
		164	int refcnt;
		165	int save; /* CORO_SAVE flags */
		166	int flags; /* CF_ flags */
		167
		168	/* optionally saved, might be zero */
		169	AV *defav; /* @_ */
		170	SV *defsv; /* $_ */
		171	SV *errsv; /* $@ */
		172	SV *irssv; /* $/ */
		173	SV *irssv_sv; /* real $/ cache */
		174
		175	#define VAR(name,type) type name;
		176	# include "state.h"
		177	#undef VAR
		178
		179	/* coro process data */
		180	int prio;
105	};	181	};
106		182
107	typedef struct coro *Coro__State;	183	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	184	typedef struct coro *Coro__State_or_hashref;
109		185
110	static AV *main_mainstack; /* used to differentiate between $main and others */	186	static AV *
111	static HV *coro_state_stash;	187	coro_clone_padlist (CV *cv)
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115
116	/* mostly copied from op.c:cv_clone2 */
117	STATIC AV *
118	clone_padlist (AV *protopadlist)
119	{	188	{
120	AV *av;	189	AV *padlist = CvPADLIST (cv);
121	I32 ix;
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
124	SV **pname = AvARRAY (protopad_name);
125	SV **ppad = AvARRAY (protopad);
126	I32 fname = AvFILLp (protopad_name);
127	I32 fpad = AvFILLp (protopad);
128	AV *newpadlist, *newpad_name, *newpad;	190	AV *newpadlist, *newpad;
129	SV **npad;
130
131	newpad_name = newAV ();
132	for (ix = fname; ix >= 0; ix--)
133	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135	newpad = newAV ();
136	av_fill (newpad, AvFILLp (protopad));
137	npad = AvARRAY (newpad);
138		191
139	newpadlist = newAV ();	192	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	193	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	194	#if PERL_VERSION_ATLEAST (5,9,0)
		195	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		196	#else
		197	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		198	#endif
		199	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		200	--AvFILLp (padlist);
		201
		202	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	203	av_store (newpadlist, 1, (SV *)newpad);
143		204
144	av = newAV (); /* will be @_ */	205	return newpadlist;
145	av_extend (av, 0);	206	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		207
149	for (ix = fpad; ix > 0; ix--)	208	static void
		209	free_padlist (AV *padlist)
		210	{
		211	/* may be during global destruction */
		212	if (SvREFCNT (padlist))
150	{	213	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	214	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	215	while (i >= 0)
153	{	216	{
154	char *name = SvPVX (namesv); /* XXX */	217	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	218	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	219	{
159	else
160	{ /* our own lexical */
161	SV *sv;	220	SV *sv;
162	if (*name == '&')	221	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	222	SvREFCNT_dec (sv);
164	else if (*name == '@')	223
165	sv = (SV *) newAV ();	224	SvREFCNT_dec (*svp);
166	else if (*name == '%')
167	sv = (SV *) newHV ();
168	else
169	sv = NEWSV (0, 0);
170	if (!SvPADBUSY (sv))
171	SvPADMY_on (sv);
172	npad[ix] = sv;
173	}	225	}
174	}	226	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	227
176	{	228	SvREFCNT_dec ((SV*)padlist);
177	npad[ix] = SvREFCNT_inc (ppad[ix]);
178	}
179	else
180	{
181	SV *sv = NEWSV (0, 0);
182	SvPADTMP_on (sv);
183	npad[ix] = sv;
184	}
185	}	229	}
		230	}
186		231
187	#if 0 /* return -ENOTUNDERSTOOD */	232	static int
188	/* Now that vars are all in place, clone nested closures. */	233	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		234	{
		235	AV *padlist;
		236	AV *av = (AV *)mg->mg_obj;
189		237
190	for (ix = fpad; ix > 0; ix--) {	238	/* casting is fun. */
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	239	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
192	if (namesv	240	free_padlist (padlist);
193	&& namesv != &PL_sv_undef	241
194	&& !(SvFLAGS(namesv) & SVf_FAKE)	242	SvREFCNT_dec (av);
195	&& *SvPVX(namesv) == '&'	243
196	&& CvCLONE(ppad[ix]))	244	return 0;
197	{	245	}
198	CV *kid = cv_clone((CV*)ppad[ix]);	246
199	SvREFCNT_dec(ppad[ix]);	247	#define PERL_MAGIC_coro PERL_MAGIC_ext
200	CvCLONE_on(kid);	248
201	SvPADMY_on(kid);	249	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
202	npad[ix] = (SV*)kid;	250
203	}	251	#define CORO_MAGIC(cv) \
		252	SvMAGIC (cv) \
		253	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		254	? SvMAGIC (cv) \
		255	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		256	: 0
		257
		258	/* the next two functions merely cache the padlists */
		259	static void
		260	get_padlist (CV *cv)
		261	{
		262	MAGIC *mg = CORO_MAGIC (cv);
		263	AV *av;
		264
		265	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		266	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		267	else
		268	{
		269	#if PREFER_PERL_FUNCTIONS
		270	/* this is probably cleaner, but also slower? */
		271	CV *cp = Perl_cv_clone (cv);
		272	CvPADLIST (cv) = CvPADLIST (cp);
		273	CvPADLIST (cp) = 0;
		274	SvREFCNT_dec (cp);
		275	#else
		276	CvPADLIST (cv) = coro_clone_padlist (cv);
		277	#endif
		278	}
		279	}
		280
		281	static void
		282	put_padlist (CV *cv)
		283	{
		284	MAGIC *mg = CORO_MAGIC (cv);
		285	AV *av;
		286
		287	if (!mg)
		288	{
		289	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		290	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		291	mg->mg_virtual = &vtbl_coro;
		292	mg->mg_obj = (SV *)newAV ();
204	}	293	}
205	#endif
206		294
207	return newpadlist;	295	av = (AV *)mg->mg_obj;
208	}
209		296
210	#ifdef MAY_FLUSH	297	if (AvFILLp (av) >= AvMAX (av))
211	STATIC AV *	298	av_extend (av, AvMAX (av) + 1);
212	free_padlist (AV *padlist)
213	{
214	/* may be during global destruction */
215	if (SvREFCNT(padlist))
216	{
217	I32 i = AvFILLp(padlist);
218	while (i >= 0)
219	{
220	SV **svp = av_fetch(padlist, i--, FALSE);
221	SV *sv = svp ? *svp : Nullsv;
222	if (sv)
223	SvREFCNT_dec(sv);
224	}
225		299
226	SvREFCNT_dec((SV*)padlist);	300	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
227	}
228	}	301	}
229	#endif
230
231	/* the next two functions merely cache the padlists */
232	STATIC void
233	get_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
236
237	if (he && AvFILLp ((AV *)*he) >= 0)
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
239	else
240	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241	}
242
243	STATIC void
244	put_padlist (CV *cv)
245	{
246	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248	if (SvTYPE (*he) != SVt_PVAV)
249	{
250	SvREFCNT_dec (*he);
251	*he = (SV *)newAV ();
252	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282		302
283	#define SB do {	303	#define SB do {
284	#define SE } while (0)	304	#define SE } while (0)
285		305
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	306	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
290		307
291	static void	308	static void
292	load_state(pTHX_ Coro__State c)	309	load_perl (Coro__State c)
293	{	310	{
294	PL_dowarn = c->dowarn;	311	#define VAR(name,type) PL_ ## name = c->name;
295	PL_in_eval = c->in_eval;	312	# include "state.h"
296		313	#undef VAR
297	PL_curstackinfo = c->curstackinfo;
298	PL_curstack = c->curstack;
299	PL_mainstack = c->mainstack;
300	PL_stack_sp = c->stack_sp;
301	PL_op = c->op;
302	PL_curpad = c->curpad;
303	PL_stack_base = c->stack_base;
304	PL_stack_max = c->stack_max;
305	PL_tmps_stack = c->tmps_stack;
306	PL_tmps_floor = c->tmps_floor;
307	PL_tmps_ix = c->tmps_ix;
308	PL_tmps_max = c->tmps_max;
309	PL_markstack = c->markstack;
310	PL_markstack_ptr = c->markstack_ptr;
311	PL_markstack_max = c->markstack_max;
312	PL_scopestack = c->scopestack;
313	PL_scopestack_ix = c->scopestack_ix;
314	PL_scopestack_max = c->scopestack_max;
315	PL_savestack = c->savestack;
316	PL_savestack_ix = c->savestack_ix;
317	PL_savestack_max = c->savestack_max;
318	PL_retstack = c->retstack;
319	PL_retstack_ix = c->retstack_ix;
320	PL_retstack_max = c->retstack_max;
321	PL_curcop = c->curcop;
322	PL_top_env = c->top_env;
323		314
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	315	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	316	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	317	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		318	if (c->irssv)
		319	{
		320	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		321	SvREFCNT_dec (c->irssv);
		322	else
		323	{
		324	REPLACE_SV (PL_rs, c->irssv);
		325	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		326	sv_setsv (c->irssv_sv, PL_rs);
		327	}
		328	}
327		329
328	{	330	{
329	dSP;	331	dSP;
330	CV *cv;	332	CV *cv;
331		333
332	/* now do the ugly restore mess */	334	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	335	while ((cv = (CV *)POPs))
334	{	336	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	337	put_padlist (cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	338	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	339	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	340	}
348		341
349	PUTBACK;	342	PUTBACK;
350	}	343	}
351	}	344	}
352		345
353	static void	346	static void
354	save_state(pTHX_ Coro__State c, int flags)	347	save_perl (Coro__State c)
355	{	348	{
356	{	349	{
357	dSP;	350	dSP;
358	I32 cxix = cxstack_ix;	351	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	352	PERL_CONTEXT *ccstk = cxstack;
…		…
362	/*	355	/*
363	* the worst thing you can imagine happens first - we have to save	356	* the worst thing you can imagine happens first - we have to save
364	* (and reinitialize) all cv's in the whole callchain :(	357	* (and reinitialize) all cv's in the whole callchain :(
365	*/	358	*/
366		359
		360	EXTEND (SP, 3 + 1);
367	PUSHs (Nullsv);	361	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	362	/* this loop was inspired by pp_caller */
369	for (;;)	363	for (;;)
370	{	364	{
371	do	365	while (cxix >= 0)
372	{	366	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	367	PERL_CONTEXT *cx = &ccstk[cxix--];
374		368
375	if (CxTYPE(cx) == CXt_SUB)	369	if (CxTYPE (cx) == CXt_SUB)
376	{	370	{
377	CV *cv = cx->blk_sub.cv;	371	CV *cv = cx->blk_sub.cv;
		372
378	if (CvDEPTH(cv))	373	if (CvDEPTH (cv))
379	{	374	{
380	#ifdef USE_THREADS
381	/*XPUSHs ((SV *)CvOWNER(cv));*/
382	/*CvOWNER(cv) = 0;*/
383	/*error must unlock this cv etc.. etc...*/
384	#endif
385	EXTEND (SP, CvDEPTH(cv)*2);	375	EXTEND (SP, 3);
386
387	while (--CvDEPTH(cv))
388	{
389	/* this tells the restore code to increment CvDEPTH */
390	PUSHs (Nullsv);
391	PUSHs ((SV *)cv);
392	}
393
394	PUSHs ((SV *)CvPADLIST(cv));	376	PUSHs ((SV *)CvPADLIST (cv));
		377	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	378	PUSHs ((SV *)cv);
396		379
		380	CvDEPTH (cv) = 0;
397	get_padlist (cv); /* this is a monster */	381	get_padlist (cv);
398	}	382	}
399	}	383	}
400	else if (CxTYPE(cx) == CXt_FORMAT)
401	{
402	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}
406	}	384	}
407	while (cxix >= 0);
408		385
409	if (top_si->si_type == PERLSI_MAIN)	386	if (top_si->si_type == PERLSI_MAIN)
410	break;	387	break;
411		388
412	top_si = top_si->si_prev;	389	top_si = top_si->si_prev;
…		…
415	}	392	}
416		393
417	PUTBACK;	394	PUTBACK;
418	}	395	}
419		396
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	397	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	398	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	399	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		400	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
423		401
424	/* I have not the slightest idea of why av_reify is necessary */	402	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	403	# include "state.h"
426	if (c->defav)	404	#undef VAR
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430	c->in_eval = PL_in_eval;
431
432	c->curstackinfo = PL_curstackinfo;
433	c->curstack = PL_curstack;
434	c->mainstack = PL_mainstack;
435	c->stack_sp = PL_stack_sp;
436	c->op = PL_op;
437	c->curpad = PL_curpad;
438	c->stack_base = PL_stack_base;
439	c->stack_max = PL_stack_max;
440	c->tmps_stack = PL_tmps_stack;
441	c->tmps_floor = PL_tmps_floor;
442	c->tmps_ix = PL_tmps_ix;
443	c->tmps_max = PL_tmps_max;
444	c->markstack = PL_markstack;
445	c->markstack_ptr = PL_markstack_ptr;
446	c->markstack_max = PL_markstack_max;
447	c->scopestack = PL_scopestack;
448	c->scopestack_ix = PL_scopestack_ix;
449	c->scopestack_max = PL_scopestack_max;
450	c->savestack = PL_savestack;
451	c->savestack_ix = PL_savestack_ix;
452	c->savestack_max = PL_savestack_max;
453	c->retstack = PL_retstack;
454	c->retstack_ix = PL_retstack_ix;
455	c->retstack_max = PL_retstack_max;
456	c->curcop = PL_curcop;
457	c->top_env = PL_top_env;
458	}	405	}
459		406
460	/*	407	/*
461	* allocate various perl stacks. This is an exact copy	408	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	409	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	410	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	411	* not usually need a lot of stackspace.
465	*/	412	*/
466	STATIC void	413	#if PREFER_PERL_FUNCTIONS
		414	# define coro_init_stacks init_stacks
		415	#else
		416	static void
467	coro_init_stacks (pTHX)	417	coro_init_stacks ()
468	{	418	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		423
474	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		427
478	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	431	PL_tmps_max = 128;
482		432
483	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
486		436
		437	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
		439	#endif
488		440
489	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
492		444
493	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	447	PL_savestack_max = 64;
496		448
		449	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	452	PL_retstack_max = 16;
		453	#endif
500	}	454	}
		455	#endif
501		456
502	/*	457	/*
503	* destroy the stacks, the callchain etc...	458	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	459	*/
506	STATIC void	460	static void
507	destroy_stacks(pTHX)	461	coro_destroy_stacks ()
508	{	462	{
509	/* is this ugly, I ask? */	463	if (!IN_DESTRUCT)
510	while (PL_scopestack_ix)	464	{
511	LEAVE;	465	/* restore all saved variables and stuff */
		466	LEAVE_SCOPE (0);
		467	assert (PL_tmps_floor == -1);
512		468
513	/* sure it is, but more important: is it correct?? :/ */	469	/* free all temporaries */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;	470	FREETMPS;
		471	assert (PL_tmps_ix == -1);
		472
		473	POPSTACK_TO (PL_mainstack);
		474	}
516		475
517	while (PL_curstackinfo->si_next)	476	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	477	PL_curstackinfo = PL_curstackinfo->si_next;
519		478
520	while (PL_curstackinfo)	479	while (PL_curstackinfo)
521	{	480	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	481	PERL_SI *p = PL_curstackinfo->si_prev;
523		482
524	{	483	if (!IN_DESTRUCT)
525	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */
528	}
529
530	dounwind(-1);
531
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
		485
533	Safefree(PL_curstackinfo->si_cxstack);	486	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	487	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	488	PL_curstackinfo = p;
536	}	489	}
537		490
538	Safefree(PL_tmps_stack);	491	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	492	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	493	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	494	Safefree (PL_savestack);
		495	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	496	Safefree (PL_retstack);
543	}
544
545	static void
546	allocate_stack (Coro__State ctx, int alloc)
547	{
548	coro_stack *stack;
549
550	New (0, stack, 1, coro_stack);
551
552	stack->refcnt = 1;
553	stack->usecnt = 1;
554	stack->gencnt = ctx->gencnt = 0;
555	if (alloc)
556	{
557	#ifdef HAVE_MMAP
558	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif	497	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}	498	}
573		499
574	static void	500	static void
575	deallocate_stack (Coro__State ctx)	501	setup_coro (struct coro *coro)
576	{
577	coro_stack *stack = ctx->stack;
578
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void
600	setup_coro (void *arg)
601	{	502	{
602	/*	503	/*
603	* emulate part of the perl startup here.	504	* emulate part of the perl startup here.
604	*/	505	*/
		506
		507	coro_init_stacks ();
		508
		509	PL_curcop = &PL_compiling;
		510	PL_in_eval = EVAL_NULL;
		511	PL_curpm = 0;
		512	PL_localizing = 0;
		513	PL_dirty = 0;
		514	PL_restartop = 0;
		515
		516	{
		517	dSP;
		518	LOGOP myop;
		519
		520	SvREFCNT_dec (GvAV (PL_defgv));
		521	GvAV (PL_defgv) = coro->args; coro->args = 0;
		522
		523	Zero (&myop, 1, LOGOP);
		524	myop.op_next = Nullop;
		525	myop.op_flags = OPf_WANT_VOID;
		526
		527	PUSHMARK (SP);
		528	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		529	PUTBACK;
		530	PL_op = (OP *)&myop;
		531	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		532	SPAGAIN;
		533	}
		534
		535	ENTER; /* necessary e.g. for dounwind */
		536	}
		537
		538	static void
		539	free_coro_mortal ()
		540	{
		541	if (coro_mortal)
		542	{
		543	SvREFCNT_dec (coro_mortal);
		544	coro_mortal = 0;
		545	}
		546	}
		547
		548	/* inject a fake call to Coro::State::_cctx_init into the execution */
		549	static void NOINLINE
		550	prepare_cctx (coro_cctx *cctx)
		551	{
605	dSP;	552	dSP;
606	Coro__State ctx = (Coro__State)arg;	553	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		554
609	coro_init_stacks (aTHX);	555	Zero (&myop, 1, LOGOP);
610	/*PL_curcop = 0;*/	556	myop.op_next = PL_op;
611	/*PL_in_eval = PL_in_eval;*/ /* inherit */	557	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
612	SvREFCNT_dec (GvAV (PL_defgv));
613	GvAV (PL_defgv) = ctx->args;
614		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);
615	SPAGAIN;	566	SPAGAIN;
616
617	if (ctx->stack)
618	{
619	ctx->cursp = 0;
620
621	PUSHMARK(SP);
622	PUTBACK;
623	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
624
625	if (SvTRUE (ERRSV))
626	croak (NULL);
627	else
628	croak ("FATAL: CCTXT coroutine returned!");
629	}
630	else
631	{
632	UNOP myop;
633
634	PL_op = (OP *)&myop;
635
636	Zero(&myop, 1, UNOP);
637	myop.op_next = Nullop;
638	myop.op_flags = OPf_WANT_VOID;
639
640	PUSHMARK(SP);
641	XPUSHs (sub_init);
642	/*
643	* the next line is slightly wrong, as PL_op->op_next
644	* is actually being executed so we skip the first op.
645	* that doesn't matter, though, since it is only
646	* pp_nextstate and we never return...
647	* ah yes, and I don't care anyways ;)
648	*/
649	PUTBACK;
650	PL_op = pp_entersub();
651	SPAGAIN;
652
653	ENTER; /* necessary e.g. for dounwind */
654	}
655	}	567	}
656		568
657	static void	569	static void
658	continue_coro (void *arg)	570	coro_run (void *arg)
659	{	571	{
		572	/* coro_run is the alternative tail of transfer(), so unlock here. */
		573	UNLOCK;
		574
660	/*	575	/*
661	* this is a _very_ stripped down perl interpreter ;)	576	* this is a _very_ stripped down perl interpreter ;)
662	*/	577	*/
663	Coro__State ctx = (Coro__State)arg;	578	PL_top_env = &PL_start_env;
664		579
665	/*FIXME*//* must set up top_env here */	580	/* inject call to cctx_init */
666	ctx->cursp = 0;	581	prepare_cctx ((coro_cctx *)arg);
667	PL_op = PL_op->op_next;
668	CALLRUNOPS(aTHX);
669		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);
670	abort ();	588	abort ();
671	}	589	}
672		590
673	STATIC void	591	static coro_cctx *
		592	cctx_new ()
		593	{
		594	coro_cctx *cctx;
		595
		596	++cctx_count;
		597
		598	Newz (0, cctx, 1, coro_cctx);
		599
		600	#if HAVE_MMAP
		601
		602	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		603	/* mmap supposedly does allocate-on-write for us */
		604	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		605
		606	if (cctx->sptr == (void *)-1)
		607	{
		608	perror ("FATAL: unable to mmap stack for coroutine");
		609	_exit (EXIT_FAILURE);
		610	}
		611
		612	# if STACKGUARD
		613	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		614	# endif
		615
		616	#else
		617
		618	cctx->ssize = STACKSIZE * (long)sizeof (long);
		619	New (0, cctx->sptr, STACKSIZE, long);
		620
		621	if (!cctx->sptr)
		622	{
		623	perror ("FATAL: unable to malloc stack for coroutine");
		624	_exit (EXIT_FAILURE);
		625	}
		626
		627	#endif
		628
		629	#if USE_VALGRIND
		630	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		631	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		632	cctx->ssize + (char *)cctx->sptr
		633	);
		634	#endif
		635
		636	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		637
		638	return cctx;
		639	}
		640
		641	static void
		642	cctx_destroy (coro_cctx *cctx)
		643	{
		644	if (!cctx)
		645	return;
		646
		647	--cctx_count;
		648
		649	#if USE_VALGRIND
		650	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		651	#endif
		652
		653	#if HAVE_MMAP
		654	munmap (cctx->sptr, cctx->ssize);
		655	#else
		656	Safefree (cctx->sptr);
		657	#endif
		658
		659	Safefree (cctx);
		660	}
		661
		662	static coro_cctx *
		663	cctx_get ()
		664	{
		665	coro_cctx *cctx;
		666
		667	if (cctx_first)
		668	{
		669	cctx = cctx_first;
		670	cctx_first = cctx->next;
		671	--cctx_idle;
		672	}
		673	else
		674	{
		675	cctx = cctx_new ();
		676	PL_op = PL_op->op_next;
		677	}
		678
		679	return cctx;
		680	}
		681
		682	static void
		683	cctx_put (coro_cctx *cctx)
		684	{
		685	/* free another cctx if overlimit */
		686	if (cctx_idle >= MAX_IDLE_CCTX)
		687	{
		688	coro_cctx *first = cctx_first;
		689	cctx_first = first->next;
		690	--cctx_idle;
		691
		692	assert (!first->inuse);
		693	cctx_destroy (first);
		694	}
		695
		696	++cctx_idle;
		697	cctx->next = cctx_first;
		698	cctx_first = cctx;
		699	}
		700
		701	/* never call directly, always through the coro_state_transfer global variable */
		702	static void NOINLINE
674	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	703	transfer (struct coro *prev, struct coro *next)
675	{	704	{
676	dSP;
677	dSTACKLEVEL;	705	dSTACKLEVEL;
678		706
		707	/* sometimes transfer is only called to set idle_sp */
		708	if (!next)
		709	{
		710	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		711	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		712	}
679	if (prev != next)	713	else if (prev != next)
680	{	714	{
681	if (next->mainstack)	715	coro_cctx *prev__cctx;
		716
		717	if (prev->flags & CF_NEW)
682	{	718	{
683	SAVE (prev, flags);	719	/* create a new empty context */
684	LOAD (next);	720	Newz (0, prev->cctx, 1, coro_cctx);
685		721	prev->cctx->inuse = 1;
686	/* mark this state as in-use */	722	prev->flags &= ~CF_NEW;
687	next->mainstack = 0;	723	prev->flags |= CF_RUNNING;
688	next->tmps_ix = -2;
689
690	/* stacklevel changed? if yes, grab the stack for us! */
691	if (flags & TRANSFER_SAVE_CCTXT)
692	{
693	if (!prev->stack)
694	allocate_stack (prev, 0);
695	else if (prev->cursp != stacklevel
696	&& prev->stack->usecnt > 1)
697	{
698	prev->gencnt = ++prev->stack->gencnt;
699	prev->stack->usecnt = 1;
700	}
701
702	/* has our stack been invalidated? */
703	if (next->stack && next->stack->gencnt != next->gencnt)
704	{
705	deallocate_stack (next);
706	allocate_stack (next, 1);
707	coro_create (&(next->stack->cctx),
708	continue_coro, (void *)next,
709	next->stack->sptr, labs (next->stack->ssize));
710	}
711
712	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
713	}
714
715	}	724	}
716	else if (next->tmps_ix == -2)	725
717	croak ("tried to transfer to running coroutine");	726	/*TODO: must not croak here */
		727	if (!prev->flags & CF_RUNNING)
		728	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		729
		730	if (next->flags & CF_RUNNING)
		731	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		732
		733	prev->flags &= ~CF_RUNNING;
		734	next->flags |= CF_RUNNING;
		735
		736	LOCK;
		737
		738	if (next->flags & CF_NEW)
		739	{
		740	/* need to start coroutine */
		741	next->flags &= ~CF_NEW;
		742	/* first get rid of the old state */
		743	save_perl (prev);
		744	/* setup coroutine call */
		745	setup_coro (next);
		746	/* need a new stack */
		747	assert (!next->cctx);
		748	}
718	else	749	else
719	{	750	{
720	SAVE (prev, -1); /* first get rid of the old state */	751	/* coroutine already started */
721		752	save_perl (prev);
722	if (flags & TRANSFER_SAVE_CCTXT)	753	load_perl (next);
723	{
724	if (!prev->stack)
725	allocate_stack (prev, 0);
726
727	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728	{
729	setup_coro (next);
730
731	prev->stack->refcnt++;
732	prev->stack->usecnt++;
733	next->stack = prev->stack;
734	next->gencnt = prev->gencnt;
735	}
736	else
737	{
738	allocate_stack (next, 1);
739	coro_create (&(next->stack->cctx),
740	setup_coro, (void *)next,
741	next->stack->sptr, labs (next->stack->ssize));
742	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743	}
744	}
745	else
746	setup_coro (next);
747	}	754	}
		755
		756	prev__cctx = prev->cctx;
		757
		758	/* possibly "free" the cctx */
		759	if (prev__cctx->idle_sp == STACKLEVEL)
		760	{
		761	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		762	assert (PL_top_env == prev__cctx->top_env);
		763
		764	prev->cctx = 0;
		765
		766	cctx_put (prev__cctx);
		767	prev__cctx->inuse = 0;
		768	}
		769
		770	if (!next->cctx)
		771	{
		772	next->cctx = cctx_get ();
		773	assert (!next->cctx->inuse);
		774	next->cctx->inuse = 1;
		775	}
		776
		777	if (prev__cctx != next->cctx)
		778	{
		779	prev__cctx->top_env = PL_top_env;
		780	PL_top_env = next->cctx->top_env;
		781	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		782	}
		783
		784	free_coro_mortal ();
		785
		786	UNLOCK;
748	}	787	}
749
750	next->cursp = stacklevel;
751	}	788	}
		789
		790	struct transfer_args
		791	{
		792	struct coro *prev, *next;
		793	};
		794
		795	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		796
		797	static void
		798	coro_state_destroy (struct coro *coro)
		799	{
		800	if (coro->refcnt--)
		801	return;
		802
		803	if (coro->mainstack && coro->mainstack != main_mainstack)
		804	{
		805	struct coro temp;
		806	Zero (&temp, 1, struct coro);
		807	temp.save = CORO_SAVE_ALL;
		808
		809	if (coro->flags & CF_RUNNING)
		810	croak ("FATAL: tried to destroy currently running coroutine");
		811
		812	save_perl (&temp);
		813	load_perl (coro);
		814
		815	coro_destroy_stacks ();
		816
		817	load_perl (&temp); /* this will get rid of defsv etc.. */
		818
		819	coro->mainstack = 0;
		820	}
		821
		822	cctx_destroy (coro->cctx);
		823	SvREFCNT_dec (coro->args);
		824	Safefree (coro);
		825	}
		826
		827	static int
		828	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		829	{
		830	struct coro *coro = (struct coro *)mg->mg_ptr;
		831	mg->mg_ptr = 0;
		832
		833	coro_state_destroy (coro);
		834
		835	return 0;
		836	}
		837
		838	static int
		839	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		840	{
		841	struct coro *coro = (struct coro *)mg->mg_ptr;
		842
		843	++coro->refcnt;
		844
		845	return 0;
		846	}
		847
		848	static MGVTBL coro_state_vtbl = {
		849	0, 0, 0, 0,
		850	coro_state_clear,
		851	0,
		852	#ifdef MGf_DUP
		853	coro_state_dup,
		854	#else
		855	# define MGf_DUP 0
		856	#endif
		857	};
752		858
753	static struct coro *	859	static struct coro *
754	sv_to_coro (SV *arg, const char *funcname, const char *varname)	860	SvSTATE (SV *coro)
755	{	861	{
756	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	862	HV *stash;
		863	MAGIC *mg;
		864
		865	if (SvROK (coro))
		866	coro = SvRV (coro);
		867
		868	stash = SvSTASH (coro);
		869	if (stash != coro_stash && stash != coro_state_stash)
757	{	870	{
758	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	871	/* very slow, but rare, check */
759		872	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
760	if (!he)	873	croak ("Coro::State object required");
761	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
762
763	arg = HeVAL(he);
764	}	874	}
765		875
766	/* must also be changed inside Coro::Cont::yield */	876	mg = SvMAGIC (coro);
767	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)	877	assert (mg->mg_type == PERL_MAGIC_ext);
768	return (struct coro *) SvIV((SV*)SvRV(arg));	878	return (struct coro *)mg->mg_ptr;
769	else	879	}
770	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	880
		881	static void
		882	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		883	{
		884	ta->prev = SvSTATE (prev_sv);
		885	ta->next = SvSTATE (next_sv);
		886	}
		887
		888	static void
		889	api_transfer (SV *prev_sv, SV *next_sv)
		890	{
		891	struct transfer_args ta;
		892
		893	prepare_transfer (&ta, prev_sv, next_sv);
		894	TRANSFER (ta);
		895	}
		896
		897	static int
		898	api_save (SV *coro_sv, int new_save)
		899	{
		900	struct coro *coro = SvSTATE (coro_sv);
		901	int old_save = coro->save;
		902
		903	if (new_save >= 0)
		904	coro->save = new_save;
		905
		906	return old_save;
771	}	907	}
772		908
773	/** Coro ********************************************************************/	909	/** Coro ********************************************************************/
774		910
775	#define PRIO_MAX 3	911	#define PRIO_MAX 3
…		…
778	#define PRIO_LOW -1	914	#define PRIO_LOW -1
779	#define PRIO_IDLE -3	915	#define PRIO_IDLE -3
780	#define PRIO_MIN -4	916	#define PRIO_MIN -4
781		917
782	/* for Coro.pm */	918	/* for Coro.pm */
783	static GV *coro_current, *coro_idle;	919	static SV *coro_current;
784	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	920	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		921	static int coro_nready;
785		922
786	static void	923	static void
787	coro_enq (SV *sv)	924	coro_enq (SV *coro_sv)
788	{	925	{
789	if (SvROK (sv))	926	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
790	{	927	coro_nready++;
791	SV *hv = SvRV (sv);
792	if (SvTYPE (hv) == SVt_PVHV)
793	{
794	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
795	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
796
797	prio = prio > PRIO_MAX ? PRIO_MAX
798	: prio < PRIO_MIN ? PRIO_MIN
799	: prio;
800
801	av_push (coro_ready [prio - PRIO_MIN], sv);
802
803	return;
804	}
805	}
806
807	croak ("Coro::ready tried to enqueue something that is not a coroutine");
808	}	928	}
809		929
810	static SV *	930	static SV *
811	coro_deq (int min_prio)	931	coro_deq (int min_prio)
812	{	932	{
…		…
815	min_prio -= PRIO_MIN;	935	min_prio -= PRIO_MIN;
816	if (min_prio < 0)	936	if (min_prio < 0)
817	min_prio = 0;	937	min_prio = 0;
818		938
819	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	939	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
820	if (av_len (coro_ready[prio]) >= 0)	940	if (AvFILLp (coro_ready [prio]) >= 0)
		941	{
		942	coro_nready--;
821	return av_shift (coro_ready[prio]);	943	return av_shift (coro_ready [prio]);
		944	}
822		945
823	return 0;	946	return 0;
824	}	947	}
825		948
		949	static int
		950	api_ready (SV *coro_sv)
		951	{
		952	struct coro *coro;
		953
		954	if (SvROK (coro_sv))
		955	coro_sv = SvRV (coro_sv);
		956
		957	coro = SvSTATE (coro_sv);
		958
		959	if (coro->flags & CF_READY)
		960	return 0;
		961
		962	#if 0 /* this is actually harmless */
		963	if (coro->flags & CF_RUNNING)
		964	croak ("Coro::ready called on currently running coroutine");
		965	#endif
		966
		967	coro->flags |= CF_READY;
		968
		969	LOCK;
		970	coro_enq (SvREFCNT_inc (coro_sv));
		971	UNLOCK;
		972
		973	return 1;
		974	}
		975
		976	static int
		977	api_is_ready (SV *coro_sv)
		978	{
		979	return !!SvSTATE (coro_sv)->flags & CF_READY;
		980	}
		981
		982	static void
		983	prepare_schedule (struct transfer_args *ta)
		984	{
		985	SV *prev, *next;
		986
		987	for (;;)
		988	{
		989	LOCK;
		990	next = coro_deq (PRIO_MIN);
		991	UNLOCK;
		992
		993	if (next)
		994	break;
		995
		996	{
		997	dSP;
		998
		999	ENTER;
		1000	SAVETMPS;
		1001
		1002	PUSHMARK (SP);
		1003	PUTBACK;
		1004	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1005
		1006	FREETMPS;
		1007	LEAVE;
		1008	}
		1009	}
		1010
		1011	prev = SvRV (coro_current);
		1012	SvRV_set (coro_current, next);
		1013
		1014	/* free this only after the transfer */
		1015	LOCK;
		1016	free_coro_mortal ();
		1017	UNLOCK;
		1018	coro_mortal = prev;
		1019
		1020	assert (!SvROK(prev));//D
		1021	assert (!SvROK(next));//D
		1022
		1023	ta->prev = SvSTATE (prev);
		1024	ta->next = SvSTATE (next);
		1025
		1026	assert (ta->next->flags & CF_READY);
		1027	ta->next->flags &= ~CF_READY;
		1028	}
		1029
		1030	static void
		1031	prepare_cede (struct transfer_args *ta)
		1032	{
		1033	api_ready (coro_current);
		1034
		1035	prepare_schedule (ta);
		1036	}
		1037
		1038	static void
		1039	api_schedule (void)
		1040	{
		1041	struct transfer_args ta;
		1042
		1043	prepare_schedule (&ta);
		1044	TRANSFER (ta);
		1045	}
		1046
		1047	static void
		1048	api_cede (void)
		1049	{
		1050	struct transfer_args ta;
		1051
		1052	prepare_cede (&ta);
		1053	TRANSFER (ta);
		1054	}
		1055
826	MODULE = Coro::State PACKAGE = Coro::State	1056	MODULE = Coro::State PACKAGE = Coro::State
827		1057
828	PROTOTYPES: ENABLE	1058	PROTOTYPES: DISABLE
829		1059
830	BOOT:	1060	BOOT:
831	{ /* {} necessary for stoopid perl-5.6.x */	1061	{
832	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1062	#ifdef USE_ITHREADS
833	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1063	MUTEX_INIT (&coro_mutex);
		1064	#endif
		1065	BOOT_PAGESIZE;
		1066
834	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1067	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
835		1068
836	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1069	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
837	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1070	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
838	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1071	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1072	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
839	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1073	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
840
841	if (!padlist_cache)
842	padlist_cache = newHV ();
843		1074
844	main_mainstack = PL_mainstack;	1075	main_mainstack = PL_mainstack;
845	}
846		1076
847	Coro::State	1077	coroapi.ver = CORO_API_VERSION;
848	_newprocess(args)	1078	coroapi.transfer = api_transfer;
849	SV * args	1079
850	PROTOTYPE: $	1080	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1081	}
		1082
		1083	SV *
		1084	new (char *klass, ...)
851	CODE:	1085	CODE:
852	Coro__State coro;	1086	{
		1087	struct coro *coro;
		1088	HV *hv;
		1089	int i;
853		1090
854	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
855	croak ("Coro::State::_newprocess expects an arrayref");
856
857	New (0, coro, 1, struct coro);	1091	Newz (0, coro, 1, struct coro);
		1092	coro->args = newAV ();
		1093	coro->save = CORO_SAVE_ALL;
		1094	coro->flags = CF_NEW;
858		1095
859	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1096	hv = newHV ();
860	coro->mainstack = 0; /* actual work is done inside transfer */	1097	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
861	coro->stack = 0;	1098	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
862		1099
863	RETVAL = coro;	1100	for (i = 1; i < items; i++)
		1101	av_push (coro->args, newSVsv (ST (i)));
		1102	}
864	OUTPUT:	1103	OUTPUT:
865	RETVAL	1104	RETVAL
866		1105
		1106	int
		1107	save (SV *coro, int new_save = -1)
		1108	CODE:
		1109	RETVAL = api_save (coro, new_save);
		1110	OUTPUT:
		1111	RETVAL
		1112
867	void	1113	void
868	transfer(prev, next, flags)	1114	_set_stacklevel (...)
869	Coro::State_or_hashref prev	1115	ALIAS:
870	Coro::State_or_hashref next	1116	Coro::State::transfer = 1
871	int flags	1117	Coro::schedule = 2
872	PROTOTYPE: @	1118	Coro::cede = 3
873	CODE:	1119	CODE:
874	PUTBACK;	1120	{
875	transfer (aTHX_ prev, next, flags);	1121	struct transfer_args ta;
876	SPAGAIN;	1122
		1123	switch (ix)
		1124	{
		1125	case 0:
		1126	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1127	ta.next = 0;
		1128	break;
		1129
		1130	case 1:
		1131	if (items != 2)
		1132	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1133
		1134	prepare_transfer (&ta, ST (0), ST (1));
		1135	break;
		1136
		1137	case 2:
		1138	prepare_schedule (&ta);
		1139	break;
		1140
		1141	case 3:
		1142	prepare_cede (&ta);
		1143	break;
		1144	}
		1145
		1146	TRANSFER (ta);
		1147	}
877		1148
878	void	1149	void
879	DESTROY(coro)	1150	_clone_state_from (SV *dst, SV *src)
880	Coro::State coro	1151	CODE:
881	CODE:	1152	{
		1153	struct coro *coro_src = SvSTATE (src);
882		1154
883	if (coro->mainstack && coro->mainstack != main_mainstack)	1155	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
884	{
885	struct coro temp;
886		1156
887	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1157	++coro_src->refcnt;
888	LOAD(aTHX_ coro);	1158	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
889		1159	}
890	destroy_stacks (aTHX);
891
892	LOAD((&temp)); /* this will get rid of defsv etc.. */
893
894	coro->mainstack = 0;
895	}
896
897	deallocate_stack (coro);
898
899	Safefree (coro);
900		1160
901	void	1161	void
902	flush()
903	CODE:
904	#ifdef MAY_FLUSH
905	flush_padlist_cache ();
906	#endif
907
908	void
909	_exit(code)	1162	_exit (code)
910	int code	1163	int code
911	PROTOTYPE: $	1164	PROTOTYPE: $
912	CODE:	1165	CODE:
913	#if defined(__GLIBC__) || _POSIX_C_SOURCE
914	_exit (code);	1166	_exit (code);
915	#else
916	signal (SIGTERM, SIG_DFL);
917	raise (SIGTERM);
918	exit (code);
919	#endif
920		1167
921	MODULE = Coro::State PACKAGE = Coro::Cont	1168	int
		1169	cctx_count ()
		1170	CODE:
		1171	RETVAL = cctx_count;
		1172	OUTPUT:
		1173	RETVAL
922		1174
923	# this is slightly dirty (should expose a c-level api)	1175	int
924		1176	cctx_idle ()
925	void	1177	CODE:
926	yield(...)	1178	RETVAL = cctx_idle;
927	PROTOTYPE: @	1179	OUTPUT:
928	CODE:	1180	RETVAL
929	static SV *returnstk;
930	SV *sv;
931	AV *defav = GvAV (PL_defgv);
932	struct coro *prev, *next;
933
934	if (!returnstk)
935	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
936
937	/* set up @_ -- ugly */
938	av_clear (defav);
939	av_fill (defav, items - 1);
940	while (items--)
941	av_store (defav, items, SvREFCNT_inc (ST(items)));
942
943	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
944	sv = av_pop ((AV *)SvRV (returnstk));
945	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
946	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
947	SvREFCNT_dec (sv);
948
949	transfer(aTHX_ prev, next, 0);
950		1181
951	MODULE = Coro::State PACKAGE = Coro	1182	MODULE = Coro::State PACKAGE = Coro
952		1183
953	# this is slightly dirty (should expose a c-level api)
954
955	BOOT:	1184	BOOT:
956	{	1185	{
957	int i;	1186	int i;
		1187
958	HV *stash = gv_stashpv ("Coro", TRUE);	1188	coro_stash = gv_stashpv ("Coro", TRUE);
959		1189
960	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1190	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
961	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1191	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
962	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1192	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
963	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1193	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
964	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1194	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
965	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1195	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
966		1196
967	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1197	coro_current = get_sv ("Coro::current", FALSE);
968	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1198	SvREADONLY_on (coro_current);
969		1199
970	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1200	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
971	coro_ready[i] = newAV ();	1201	coro_ready[i] = newAV ();
		1202
		1203	{
		1204	SV *sv = perl_get_sv("Coro::API", 1);
		1205
		1206	coroapi.schedule = api_schedule;
		1207	coroapi.save = api_save;
		1208	coroapi.cede = api_cede;
		1209	coroapi.ready = api_ready;
		1210	coroapi.is_ready = api_is_ready;
		1211	coroapi.nready = &coro_nready;
		1212	coroapi.current = coro_current;
		1213
		1214	GCoroAPI = &coroapi;
		1215	sv_setiv (sv, (IV)&coroapi);
		1216	SvREADONLY_on (sv);
		1217	}
972	}	1218	}
973		1219
974	void	1220	void
975	ready(self)	1221	_set_current (SV *current)
976	SV * self	1222	PROTOTYPE: $
977	CODE:	1223	CODE:
978	coro_enq (SvREFCNT_inc (self));	1224	SvREFCNT_dec (SvRV (coro_current));
		1225	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1226
		1227	int
		1228	prio (Coro::State coro, int newprio = 0)
		1229	ALIAS:
		1230	nice = 1
		1231	CODE:
		1232	{
		1233	RETVAL = coro->prio;
		1234
		1235	if (items > 1)
		1236	{
		1237	if (ix)
		1238	newprio += coro->prio;
		1239
		1240	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1241	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1242
		1243	coro->prio = newprio;
		1244	}
		1245	}
		1246
		1247	SV *
		1248	ready (SV *self)
		1249	PROTOTYPE: $
		1250	CODE:
		1251	RETVAL = boolSV (api_ready (self));
		1252	OUTPUT:
		1253	RETVAL
		1254
		1255	SV *
		1256	is_ready (SV *self)
		1257	PROTOTYPE: $
		1258	CODE:
		1259	RETVAL = boolSV (api_is_ready (self));
		1260	OUTPUT:
		1261	RETVAL
		1262
		1263	int
		1264	nready (...)
		1265	PROTOTYPE:
		1266	CODE:
		1267	RETVAL = coro_nready;
		1268	OUTPUT:
		1269	RETVAL
		1270
		1271	MODULE = Coro::State PACKAGE = Coro::AIO
		1272
		1273	SV *
		1274	_get_state ()
		1275	CODE:
		1276	{
		1277	struct io_state *data;
		1278
		1279	RETVAL = newSV (sizeof (struct io_state));
		1280	data = (struct io_state *)SvPVX (RETVAL);
		1281	SvCUR_set (RETVAL, sizeof (struct io_state));
		1282	SvPOK_only (RETVAL);
		1283
		1284	data->errorno = errno;
		1285	data->laststype = PL_laststype;
		1286	data->laststatval = PL_laststatval;
		1287	data->statcache = PL_statcache;
		1288	}
		1289	OUTPUT:
		1290	RETVAL
979		1291
980	void	1292	void
981	schedule(...)	1293	_set_state (char *data_)
982	ALIAS:	1294	PROTOTYPE: $
983	cede = 1
984	CODE:	1295	CODE:
985	SV *prev, *next;	1296	{
		1297	struct io_state *data = (void *)data_;
986		1298
987	prev = GvSV (coro_current);	1299	errno = data->errorno;
		1300	PL_laststype = data->laststype;
		1301	PL_laststatval = data->laststatval;
		1302	PL_statcache = data->statcache;
		1303	}
988		1304
989	if (ix)
990	coro_enq (SvREFCNT_inc (prev));
991
992	next = coro_deq (PRIO_MIN);
993
994	if (!next)
995	next = SvREFCNT_inc (GvSV (coro_idle));
996
997	GvSV (coro_current) = SvREFCNT_inc (next);
998	transfer (sv_to_coro (prev, "Coro::schedule", "current coroutine"),
999	sv_to_coro (next, "Coro::schedule", "next coroutine"),
1000	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
1001	SvREFCNT_dec (next);
1002	SvREFCNT_dec (prev);
1003

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