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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.7 by root, Thu Jul 19 02:45:09 2001 UTC vs.
Revision 1.106 by root, Mon Nov 27 02:08:55 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	#if 1	7	#include "patchlevel.h"
6	# define CHK(x) (void *)0	8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	#define PERL_VERSION_ATLEAST(a,b,c) \
		14	(PERL_REVISION > (a) \
		15	|| (PERL_REVISION == (a) \
		16	&& (PERL_VERSION > (b) \
		17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		18
		19	#if !PERL_VERSION_ATLEAST (5,6,0)
		20	# ifndef PL_ppaddr
		21	# define PL_ppaddr ppaddr
		22	# endif
		23	# ifndef call_sv
		24	# define call_sv perl_call_sv
		25	# endif
		26	# ifndef get_sv
		27	# define get_sv perl_get_sv
		28	# endif
		29	# ifndef get_cv
		30	# define get_cv perl_get_cv
		31	# endif
		32	# ifndef IS_PADGV
		33	# define IS_PADGV(v) 0
		34	# endif
		35	# ifndef IS_PADCONST
		36	# define IS_PADCONST(v) 0
		37	# endif
		38	#endif
		39
		40	#include <stdio.h>
		41	#include <errno.h>
		42
		43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		44	# undef STACKGUARD
		45	#endif
		46
		47	#ifndef STACKGUARD
		48	# define STACKGUARD 0
		49	#endif
		50
		51	#ifdef HAVE_MMAP
		52	# include <unistd.h>
		53	# include <sys/mman.h>
		54	# ifndef MAP_ANONYMOUS
		55	# ifdef MAP_ANON
		56	# define MAP_ANONYMOUS MAP_ANON
		57	# else
		58	# undef HAVE_MMAP
		59	# endif
		60	# endif
		61	# include <limits.h>
		62	# ifndef PAGESIZE
		63	# define PAGESIZE pagesize
		64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		65	static long pagesize;
		66	# else
		67	# define BOOT_PAGESIZE (void)0
		68	# endif
7	#else	69	#else
8	# define CHK(x) if (!(x)) croak("FATAL, CHK: " #x)	70	# define PAGESIZE 0
		71	# define BOOT_PAGESIZE (void)0
9	#endif	72	#endif
10		73
11	#define MAY_FLUSH /* increases codesize */	74	/* The next macro should declare a variable stacklevel that contains and approximation
		75	* to the current C stack pointer. Its property is that it changes with each call
		76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
		78	#define STACKLEVEL ((void *)&stacklevel)
12		79
13	#define SAVE_DEFAV 0x00000001	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
14	#define SAVE_DEFSV 0x00000002
15	#define SAVE_ERRSV 0x00000004
16		81
17	#define SAVE_ALL -1	82	#if __GNUC__ >= 3
		83	# define attribute(x) __attribute__(x)
		84	#else
		85	# define attribute(x)
		86	#endif
18		87
		88	#define NOINLINE attribute ((noinline))
		89
		90	#include "CoroAPI.h"
		91
		92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		93
		94	#ifdef USE_ITHREADS
		95	static perl_mutex coro_mutex;
		96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		98	#else
		99	# define LOCK (void)0
		100	# define UNLOCK (void)0
		101	#endif
		102
		103	static struct CoroAPI coroapi;
		104	static AV *main_mainstack; /* used to differentiate between $main and others */
		105	static HV *coro_state_stash, *coro_stash;
		106	static SV *coro_mortal; /* will be freed after next transfer */
		107
		108	/* this is a structure representing a c-level coroutine */
		109	typedef struct coro_cctx {
		110	struct coro_cctx *next;
		111
		112	/* the stack */
		113	void *sptr;
		114	long ssize; /* positive == mmap, otherwise malloc */
		115
		116	/* cpu state */
		117	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		118	JMPENV *top_env;
		119	coro_context cctx;
		120
		121	#if USE_VALGRIND
		122	int valgrind_id;
		123	#endif
		124	} coro_cctx;
		125
		126	/* this is a structure representing a perl-level coroutine */
19	struct coro {	127	struct coro {
		128	/* the c coroutine allocated to this perl coroutine, if any */
		129	coro_cctx *cctx;
		130
		131	/* data associated with this coroutine (initial args) */
		132	AV *args;
		133	int refcnt;
		134
20	/* optionally saved, might be zero */	135	/* optionally saved, might be zero */
21	AV *defav;	136	AV *defav;
22	SV *defsv;	137	SV *defsv;
23	SV *errsv;	138	SV *errsv;
24		139
25	/* saved global state not related to stacks */	140	/* saved global state not related to stacks */
26	U8 dowarn;	141	U8 dowarn;
		142	I32 in_eval;
27		143
28	/* the stacks and related info (callchain etc..) */	144	/* the stacks and related info (callchain etc..) */
29	PERL_SI *curstackinfo;	145	PERL_SI *curstackinfo;
30	AV *curstack;	146	AV *curstack;
31	AV *mainstack;	147	AV *mainstack;
32	SV **stack_sp;	148	SV **stack_sp;
33	OP *op;	149	OP *op;
34	SV **curpad;	150	SV **curpad;
		151	AV *comppad;
		152	CV *compcv;
35	SV **stack_base;	153	SV **stack_base;
36	SV **stack_max;	154	SV **stack_max;
37	SV **tmps_stack;	155	SV **tmps_stack;
38	I32 tmps_floor;	156	I32 tmps_floor;
39	I32 tmps_ix;	157	I32 tmps_ix;
…		…
48	I32 savestack_ix;	166	I32 savestack_ix;
49	I32 savestack_max;	167	I32 savestack_max;
50	OP **retstack;	168	OP **retstack;
51	I32 retstack_ix;	169	I32 retstack_ix;
52	I32 retstack_max;	170	I32 retstack_max;
		171	PMOP *curpm;
53	COP *curcop;	172	COP *curcop;
54		173
55	/* data associated with this coroutine (initial args) */	174	/* coro process data */
56	AV *args;	175	int prio;
57	};	176	};
58		177
59	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
60	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
61		180
62	static HV *padlist_cache;	181	static AV *
63		182	coro_clone_padlist (CV *cv)
64	/* mostly copied from op.c:cv_clone2 */
65	STATIC AV *
66	clone_padlist (AV *protopadlist)
67	{	183	{
68	AV *av;	184	AV *padlist = CvPADLIST (cv);
69	I32 ix;
70	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
71	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
72	SV **pname = AvARRAY (protopad_name);
73	SV **ppad = AvARRAY (protopad);
74	I32 fname = AvFILLp (protopad_name);
75	I32 fpad = AvFILLp (protopad);
76	AV *newpadlist, *newpad_name, *newpad;	185	AV *newpadlist, *newpad;
77	SV **npad;
78
79	newpad_name = newAV ();
80	for (ix = fname; ix >= 0; ix--)
81	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
82
83	newpad = newAV ();
84	av_fill (newpad, AvFILLp (protopad));
85	npad = AvARRAY (newpad);
86		186
87	newpadlist = newAV ();	187	newpadlist = newAV ();
88	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
89	av_store (newpadlist, 0, (SV *) newpad_name);	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
		192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		193	#endif
		194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		195	--AvFILLp (padlist);
		196
		197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
90	av_store (newpadlist, 1, (SV *) newpad);	198	av_store (newpadlist, 1, (SV *)newpad);
91		199
92	av = newAV (); /* will be @_ */	200	return newpadlist;
93	av_extend (av, 0);	201	}
94	av_store (newpad, 0, (SV *) av);
95	AvFLAGS (av) = AVf_REIFY;
96		202
97	for (ix = fpad; ix > 0; ix--)	203	static void
		204	free_padlist (AV *padlist)
		205	{
		206	/* may be during global destruction */
		207	if (SvREFCNT (padlist))
98	{	208	{
99	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	209	I32 i = AvFILLp (padlist);
100	if (namesv && namesv != &PL_sv_undef)	210	while (i >= 0)
101	{	211	{
102	char *name = SvPVX (namesv); /* XXX */	212	SV **svp = av_fetch (padlist, i--, FALSE);
103	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	213	if (svp)
104	{ /* lexical from outside? */
105	npad[ix] = SvREFCNT_inc (ppad[ix]);
106	}	214	{
107	else
108	{ /* our own lexical */
109	SV *sv;	215	SV *sv;
110	if (*name == '&')	216	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
111	sv = SvREFCNT_inc (ppad[ix]);	217	SvREFCNT_dec (sv);
112	else if (*name == '@')	218
113	sv = (SV *) newAV ();	219	SvREFCNT_dec (*svp);
114	else if (*name == '%')
115	sv = (SV *) newHV ();
116	else
117	sv = NEWSV (0, 0);
118	if (!SvPADBUSY (sv))
119	SvPADMY_on (sv);
120	npad[ix] = sv;
121	}	220	}
122	}	221	}
123	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	222
124	{	223	SvREFCNT_dec ((SV*)padlist);
125	npad[ix] = SvREFCNT_inc (ppad[ix]);
126	}
127	else
128	{
129	SV *sv = NEWSV (0, 0);
130	SvPADTMP_on (sv);
131	npad[ix] = sv;
132	}
133	}	224	}
		225	}
134		226
135	#if 0 /* return -ENOTUNDERSTOOD */	227	static int
136	/* Now that vars are all in place, clone nested closures. */	228	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		229	{
		230	AV *padlist;
		231	AV *av = (AV *)mg->mg_obj;
137		232
138	for (ix = fpad; ix > 0; ix--) {	233	/* casting is fun. */
139	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
140	if (namesv	235	free_padlist (padlist);
141	&& namesv != &PL_sv_undef	236
142	&& !(SvFLAGS(namesv) & SVf_FAKE)	237	SvREFCNT_dec (av);
143	&& *SvPVX(namesv) == '&'	238
144	&& CvCLONE(ppad[ix]))	239	return 0;
145	{	240	}
146	CV *kid = cv_clone((CV*)ppad[ix]);	241
147	SvREFCNT_dec(ppad[ix]);	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
148	CvCLONE_on(kid);	243
149	SvPADMY_on(kid);	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
150	npad[ix] = (SV*)kid;	245
151	}	246	/* the next two functions merely cache the padlists */
		247	static void
		248	get_padlist (CV *cv)
		249	{
		250	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		251
		252	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
		253	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
		254	else
		255	{
		256	#if 0
		257	/* this is probably cleaner, but also slower? */
		258	CV *cp = Perl_cv_clone (cv);
		259	CvPADLIST (cv) = CvPADLIST (cp);
		260	CvPADLIST (cp) = 0;
		261	SvREFCNT_dec (cp);
		262	#else
		263	CvPADLIST (cv) = coro_clone_padlist (cv);
		264	#endif
		265	}
		266	}
		267
		268	static void
		269	put_padlist (CV *cv)
		270	{
		271	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		272
		273	if (!mg)
		274	{
		275	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		276	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		277	mg->mg_virtual = &vtbl_coro;
		278	mg->mg_obj = (SV *)newAV ();
152	}	279	}
153	#endif
154		280
155	return newpadlist;
156	}
157
158	#ifdef MAY_FLUSH
159	STATIC AV *
160	free_padlist (AV *padlist)
161	{
162	/* may be during global destruction */
163	if (SvREFCNT(padlist))
164	{
165	I32 i = AvFILLp(padlist);
166	while (i >= 0)
167	{
168	SV **svp = av_fetch(padlist, i--, FALSE);
169	SV *sv = svp ? *svp : Nullsv;
170	if (sv)
171	SvREFCNT_dec(sv);
172	}
173
174	SvREFCNT_dec((SV*)padlist);
175	}
176	}
177	#endif
178
179	/* the next two functions merely cache the padlists */
180	STATIC void
181	get_padlist (CV *cv)
182	{
183	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
184
185	if (he && AvFILLp ((AV *)*he) >= 0)
186	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
187	else
188	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
189	}
190
191	STATIC void
192	put_padlist (CV *cv)
193	{
194	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
195
196	if (SvTYPE (*he) != SVt_PVAV)
197	{
198	SvREFCNT_dec (*he);
199	*he = (SV *)newAV ();
200	}
201
202	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	281	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
203	}	282	}
204
205	#ifdef MAY_FLUSH
206	STATIC void
207	flush_padlist_cache ()
208	{
209	HV *hv = padlist_cache;
210	padlist_cache = newHV ();
211
212	if (hv_iterinit (hv))
213	{
214	HE *he;
215	AV *padlist;
216
217	while (!!(he = hv_iternext (hv)))
218	{
219	AV *av = (AV *)HeVAL(he);
220
221	/* casting is fun. */
222	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
223	free_padlist (padlist);
224	}
225	}
226
227	SvREFCNT_dec (hv);
228	}
229	#endif
230		283
231	#define SB do {	284	#define SB do {
232	#define SE } while (0)	285	#define SE } while (0)
233		286
234	#define LOAD(state) SB load_state(aTHX_ state); SPAGAIN; SE	287	#define LOAD(state) load_state((state));
235	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ state,flags); SE	288	#define SAVE(state,flags) save_state((state),(flags));
236		289
237	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	290	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
238		291
239	static void	292	static void
240	load_state(pTHX_ Coro__State c)	293	load_state(Coro__State c)
241	{	294	{
242	PL_dowarn = c->dowarn;	295	PL_dowarn = c->dowarn;
		296	PL_in_eval = c->in_eval;
243		297
244	PL_curstackinfo = c->curstackinfo;	298	PL_curstackinfo = c->curstackinfo;
245	PL_curstack = c->curstack;	299	PL_curstack = c->curstack;
246	PL_mainstack = c->mainstack;	300	PL_mainstack = c->mainstack;
247	PL_stack_sp = c->stack_sp;	301	PL_stack_sp = c->stack_sp;
248	PL_op = c->op;	302	PL_op = c->op;
249	PL_curpad = c->curpad;	303	PL_curpad = c->curpad;
		304	PL_comppad = c->comppad;
		305	PL_compcv = c->compcv;
250	PL_stack_base = c->stack_base;	306	PL_stack_base = c->stack_base;
251	PL_stack_max = c->stack_max;	307	PL_stack_max = c->stack_max;
252	PL_tmps_stack = c->tmps_stack;	308	PL_tmps_stack = c->tmps_stack;
253	PL_tmps_floor = c->tmps_floor;	309	PL_tmps_floor = c->tmps_floor;
254	PL_tmps_ix = c->tmps_ix;	310	PL_tmps_ix = c->tmps_ix;
…		…
260	PL_scopestack_ix = c->scopestack_ix;	316	PL_scopestack_ix = c->scopestack_ix;
261	PL_scopestack_max = c->scopestack_max;	317	PL_scopestack_max = c->scopestack_max;
262	PL_savestack = c->savestack;	318	PL_savestack = c->savestack;
263	PL_savestack_ix = c->savestack_ix;	319	PL_savestack_ix = c->savestack_ix;
264	PL_savestack_max = c->savestack_max;	320	PL_savestack_max = c->savestack_max;
		321	#if !PERL_VERSION_ATLEAST (5,9,0)
265	PL_retstack = c->retstack;	322	PL_retstack = c->retstack;
266	PL_retstack_ix = c->retstack_ix;	323	PL_retstack_ix = c->retstack_ix;
267	PL_retstack_max = c->retstack_max;	324	PL_retstack_max = c->retstack_max;
		325	#endif
		326	PL_curpm = c->curpm;
268	PL_curcop = c->curcop;	327	PL_curcop = c->curcop;
269		328
270	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	329	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
271	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	330	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
272	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	331	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
…		…
282		341
283	if (padlist)	342	if (padlist)
284	{	343	{
285	put_padlist (cv); /* mark this padlist as available */	344	put_padlist (cv); /* mark this padlist as available */
286	CvPADLIST(cv) = padlist;	345	CvPADLIST(cv) = padlist;
287	#ifdef USE_THREADS
288	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
289	#endif
290	}	346	}
291		347
292	++CvDEPTH(cv);	348	++CvDEPTH(cv);
293	}	349	}
294		350
295	PUTBACK;	351	PUTBACK;
296	}	352	}
297	}	353	}
298		354
299	static void	355	static void
300	save_state(pTHX_ Coro__State c, int flags)	356	save_state(Coro__State c, int flags)
301	{	357	{
302	{	358	{
303	dSP;	359	dSP;
304	I32 cxix = cxstack_ix;	360	I32 cxix = cxstack_ix;
		361	PERL_CONTEXT *ccstk = cxstack;
305	PERL_SI *top_si = PL_curstackinfo;	362	PERL_SI *top_si = PL_curstackinfo;
306	PERL_CONTEXT *ccstk = cxstack;
307		363
308	/*	364	/*
309	* the worst thing you can imagine happens first - we have to save	365	* the worst thing you can imagine happens first - we have to save
310	* (and reinitialize) all cv's in the whole callchain :(	366	* (and reinitialize) all cv's in the whole callchain :(
311	*/	367	*/
312		368
313	PUSHs (Nullsv);	369	PUSHs (Nullsv);
314	/* this loop was inspired by pp_caller */	370	/* this loop was inspired by pp_caller */
315	for (;;)	371	for (;;)
316	{	372	{
317	do	373	while (cxix >= 0)
318	{	374	{
319	PERL_CONTEXT *cx = &ccstk[cxix--];	375	PERL_CONTEXT *cx = &ccstk[cxix--];
320		376
321	if (CxTYPE(cx) == CXt_SUB)	377	if (CxTYPE(cx) == CXt_SUB)
322	{	378	{
323	CV *cv = cx->blk_sub.cv;	379	CV *cv = cx->blk_sub.cv;
324	if (CvDEPTH(cv))	380	if (CvDEPTH(cv))
325	{	381	{
326	#ifdef USE_THREADS
327	/*XPUSHs ((SV *)CvOWNER(cv));*/
328	/*CvOWNER(cv) = 0;*/
329	/*error must unlock this cv etc.. etc...*/
330	#endif
331	EXTEND (SP, CvDEPTH(cv)*2);	382	EXTEND (SP, CvDEPTH(cv)*2);
332		383
333	while (--CvDEPTH(cv))	384	while (--CvDEPTH(cv))
334	{	385	{
335	/* this tells the restore code to increment CvDEPTH */	386	/* this tells the restore code to increment CvDEPTH */
…		…
338	}	389	}
339		390
340	PUSHs ((SV *)CvPADLIST(cv));	391	PUSHs ((SV *)CvPADLIST(cv));
341	PUSHs ((SV *)cv);	392	PUSHs ((SV *)cv);
342		393
343	get_padlist (cv); /* this is a monster */	394	get_padlist (cv);
344	}	395	}
345	}	396	}
		397	#ifdef CXt_FORMAT
346	else if (CxTYPE(cx) == CXt_FORMAT)	398	else if (CxTYPE(cx) == CXt_FORMAT)
347	{	399	{
348	/* I never used formats, so how should I know how these are implemented? */	400	/* I never used formats, so how should I know how these are implemented? */
349	/* my bold guess is as a simple, plain sub... */	401	/* my bold guess is as a simple, plain sub... */
350	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	402	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
351	}	403	}
		404	#endif
352	}	405	}
353	while (cxix >= 0);
354		406
355	if (top_si->si_type == PERLSI_MAIN)	407	if (top_si->si_type == PERLSI_MAIN)
356	break;	408	break;
357		409
358	top_si = top_si->si_prev;	410	top_si = top_si->si_prev;
…		…
361	}	413	}
362		414
363	PUTBACK;	415	PUTBACK;
364	}	416	}
365		417
366	c->defav = flags & SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	418	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
367	c->defsv = flags & SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	419	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
368	c->errsv = flags & SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	420	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
369		421
370	c->dowarn = PL_dowarn;	422	c->dowarn = PL_dowarn;
		423	c->in_eval = PL_in_eval;
371		424
372	c->curstackinfo = PL_curstackinfo;	425	c->curstackinfo = PL_curstackinfo;
373	c->curstack = PL_curstack;	426	c->curstack = PL_curstack;
374	c->mainstack = PL_mainstack;	427	c->mainstack = PL_mainstack;
375	c->stack_sp = PL_stack_sp;	428	c->stack_sp = PL_stack_sp;
376	c->op = PL_op;	429	c->op = PL_op;
377	c->curpad = PL_curpad;	430	c->curpad = PL_curpad;
		431	c->comppad = PL_comppad;
		432	c->compcv = PL_compcv;
378	c->stack_base = PL_stack_base;	433	c->stack_base = PL_stack_base;
379	c->stack_max = PL_stack_max;	434	c->stack_max = PL_stack_max;
380	c->tmps_stack = PL_tmps_stack;	435	c->tmps_stack = PL_tmps_stack;
381	c->tmps_floor = PL_tmps_floor;	436	c->tmps_floor = PL_tmps_floor;
382	c->tmps_ix = PL_tmps_ix;	437	c->tmps_ix = PL_tmps_ix;
…		…
388	c->scopestack_ix = PL_scopestack_ix;	443	c->scopestack_ix = PL_scopestack_ix;
389	c->scopestack_max = PL_scopestack_max;	444	c->scopestack_max = PL_scopestack_max;
390	c->savestack = PL_savestack;	445	c->savestack = PL_savestack;
391	c->savestack_ix = PL_savestack_ix;	446	c->savestack_ix = PL_savestack_ix;
392	c->savestack_max = PL_savestack_max;	447	c->savestack_max = PL_savestack_max;
		448	#if !PERL_VERSION_ATLEAST (5,9,0)
393	c->retstack = PL_retstack;	449	c->retstack = PL_retstack;
394	c->retstack_ix = PL_retstack_ix;	450	c->retstack_ix = PL_retstack_ix;
395	c->retstack_max = PL_retstack_max;	451	c->retstack_max = PL_retstack_max;
		452	#endif
		453	c->curpm = PL_curpm;
396	c->curcop = PL_curcop;	454	c->curcop = PL_curcop;
		455	}
		456
		457	/*
		458	* allocate various perl stacks. This is an exact copy
		459	* of perl.c:init_stacks, except that it uses less memory
		460	* on the (sometimes correct) assumption that coroutines do
		461	* not usually need a lot of stackspace.
		462	*/
		463	static void
		464	coro_init_stacks ()
		465	{
		466	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
		467	PL_curstackinfo->si_type = PERLSI_MAIN;
		468	PL_curstack = PL_curstackinfo->si_stack;
		469	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
		470
		471	PL_stack_base = AvARRAY(PL_curstack);
		472	PL_stack_sp = PL_stack_base;
		473	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
		474
		475	New(50,PL_tmps_stack,96,SV*);
		476	PL_tmps_floor = -1;
		477	PL_tmps_ix = -1;
		478	PL_tmps_max = 96;
		479
		480	New(54,PL_markstack,16,I32);
		481	PL_markstack_ptr = PL_markstack;
		482	PL_markstack_max = PL_markstack + 16;
		483
		484	#ifdef SET_MARK_OFFSET
		485	SET_MARK_OFFSET;
		486	#endif
		487
		488	New(54,PL_scopestack,16,I32);
		489	PL_scopestack_ix = 0;
		490	PL_scopestack_max = 16;
		491
		492	New(54,PL_savestack,96,ANY);
		493	PL_savestack_ix = 0;
		494	PL_savestack_max = 96;
		495
		496	#if !PERL_VERSION_ATLEAST (5,9,0)
		497	New(54,PL_retstack,8,OP*);
		498	PL_retstack_ix = 0;
		499	PL_retstack_max = 8;
		500	#endif
397	}	501	}
398		502
399	/*	503	/*
400	* destroy the stacks, the callchain etc...	504	* destroy the stacks, the callchain etc...
401	* still there is a memleak of 128 bytes...
402	*/	505	*/
403	STATIC void	506	static void
404	destroy_stacks(pTHX)	507	coro_destroy_stacks ()
405	{	508	{
		509	if (!IN_DESTRUCT)
		510	{
406	/* is this ugly, I ask? */	511	/* is this ugly, I ask? */
407	while (PL_scopestack_ix)	512	LEAVE_SCOPE (0);
408	LEAVE;
409		513
410	/* sure it is, but more important: is it correct?? :/ */	514	/* sure it is, but more important: is it correct?? :/ */
411	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
412	FREETMPS;	515	FREETMPS;
		516
		517	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		518	}
413		519
414	while (PL_curstackinfo->si_next)	520	while (PL_curstackinfo->si_next)
415	PL_curstackinfo = PL_curstackinfo->si_next;	521	PL_curstackinfo = PL_curstackinfo->si_next;
416		522
417	while (PL_curstackinfo)	523	while (PL_curstackinfo)
418	{	524	{
419	PERL_SI *p = PL_curstackinfo->si_prev;	525	PERL_SI *p = PL_curstackinfo->si_prev;
420		526
421	{	527	{ /*D*//*remove*/
422	dSP;	528	dSP;
423	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	529	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
424	PUTBACK; /* possibly superfluous */	530	PUTBACK; /* possibly superfluous */
425	}	531	}
426		532
427	dounwind(-1);	533	if (!IN_DESTRUCT)
428		534	{
		535	dounwind (-1);/*D*//*remove*/
429	SvREFCNT_dec(PL_curstackinfo->si_stack);	536	SvREFCNT_dec (PL_curstackinfo->si_stack);
		537	}
		538
430	Safefree(PL_curstackinfo->si_cxstack);	539	Safefree (PL_curstackinfo->si_cxstack);
431	Safefree(PL_curstackinfo);	540	Safefree (PL_curstackinfo);
432	PL_curstackinfo = p;	541	PL_curstackinfo = p;
433	}	542	}
434		543
435	Safefree(PL_tmps_stack);	544	Safefree (PL_tmps_stack);
436	Safefree(PL_markstack);	545	Safefree (PL_markstack);
437	Safefree(PL_scopestack);	546	Safefree (PL_scopestack);
438	Safefree(PL_savestack);	547	Safefree (PL_savestack);
		548	#if !PERL_VERSION_ATLEAST (5,9,0)
439	Safefree(PL_retstack);	549	Safefree (PL_retstack);
		550	#endif
440	}	551	}
441		552
442	#define SUB_INIT "Coro::State::_newcoro"	553	static void
		554	setup_coro (struct coro *coro)
		555	{
		556	/*
		557	* emulate part of the perl startup here.
		558	*/
		559
		560	coro_init_stacks ();
		561
		562	PL_curcop = 0;
		563	PL_in_eval = 0;
		564	PL_curpm = 0;
		565
		566	{
		567	dSP;
		568	LOGOP myop;
		569
		570	/* I have no idea why this is needed, but it is */
		571	PUSHMARK (SP);
		572
		573	SvREFCNT_dec (GvAV (PL_defgv));
		574	GvAV (PL_defgv) = coro->args; coro->args = 0;
		575
		576	Zero (&myop, 1, LOGOP);
		577	myop.op_next = Nullop;
		578	myop.op_flags = OPf_WANT_VOID;
		579
		580	PL_op = (OP *)&myop;
		581
		582	PUSHMARK (SP);
		583	XPUSHs ((SV *)get_cv ("Coro::State::coro_init", FALSE));
		584	PUTBACK;
		585	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		586	SPAGAIN;
		587
		588	ENTER; /* necessary e.g. for dounwind */
		589	}
		590	}
		591
		592	static void
		593	free_coro_mortal ()
		594	{
		595	if (coro_mortal)
		596	{
		597	SvREFCNT_dec (coro_mortal);
		598	coro_mortal = 0;
		599	}
		600	}
		601
		602	static void NOINLINE
		603	prepare_cctx (coro_cctx *cctx)
		604	{
		605	dSP;
		606	LOGOP myop;
		607
		608	Zero (&myop, 1, LOGOP);
		609	myop.op_next = PL_op;
		610	myop.op_flags = OPf_WANT_VOID;
		611
		612	sv_setiv (get_sv ("Coro::State::cctx", FALSE), PTR2IV (cctx));
		613
		614	PUSHMARK (SP);
		615	XPUSHs ((SV *)get_cv ("Coro::State::cctx_init", FALSE));
		616	PUTBACK;
		617	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
		618	SPAGAIN;
		619	}
		620
		621	static void
		622	coro_run (void *arg)
		623	{
		624	/* coro_run is the alternative epilogue of transfer() */
		625	UNLOCK;
		626
		627	/*
		628	* this is a _very_ stripped down perl interpreter ;)
		629	*/
		630	PL_top_env = &PL_start_env;
		631	/* inject call to cctx_init */
		632	prepare_cctx ((coro_cctx *)arg);
		633
		634	/* somebody will hit me for both perl_run and PL_restartop */
		635	perl_run (PL_curinterp);
		636
		637	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		638	abort ();
		639	}
		640
		641	static coro_cctx *
		642	cctx_new ()
		643	{
		644	coro_cctx *cctx;
		645
		646	New (0, cctx, 1, coro_cctx);
		647
		648	#if HAVE_MMAP
		649
		650	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		651	/* mmap suppsedly does allocate-on-write for us */
		652	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		653
		654	if (cctx->sptr == (void *)-1)
		655	{
		656	perror ("FATAL: unable to mmap stack for coroutine");
		657	_exit (EXIT_FAILURE);
		658	}
		659
		660	# if STACKGUARD
		661	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		662	# endif
		663
		664	#else
		665
		666	cctx->ssize = STACKSIZE * (long)sizeof (long);
		667	New (0, cctx->sptr, STACKSIZE, long);
		668
		669	if (!cctx->sptr)
		670	{
		671	perror ("FATAL: unable to malloc stack for coroutine");
		672	_exit (EXIT_FAILURE);
		673	}
		674
		675	#endif
		676
		677	#if USE_VALGRIND
		678	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		679	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		680	cctx->ssize + (char *)cctx->sptr
		681	);
		682	#endif
		683
		684	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		685
		686	return cctx;
		687	}
		688
		689	static void
		690	cctx_free (coro_cctx *cctx)
		691	{
		692	if (!cctx)
		693	return;
		694
		695	#if USE_VALGRIND
		696	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		697	#endif
		698
		699	#if HAVE_MMAP
		700	munmap (cctx->sptr, cctx->ssize);
		701	#else
		702	Safefree (cctx->sptr);
		703	#endif
		704
		705	Safefree (cctx);
		706	}
		707
		708	static coro_cctx *cctx_first;
		709	static int cctx_count, cctx_idle;
		710
		711	static coro_cctx *
		712	cctx_get ()
		713	{
		714	coro_cctx *cctx;
		715
		716	if (cctx_first)
		717	{
		718	--cctx_idle;
		719	cctx = cctx_first;
		720	cctx_first = cctx->next;
		721	}
		722	else
		723	{
		724	++cctx_count;
		725	cctx = cctx_new ();
		726	PL_op = PL_op->op_next;
		727	}
		728
		729	return cctx;
		730	}
		731
		732	static void
		733	cctx_put (coro_cctx *cctx)
		734	{
		735	++cctx_idle;
		736	cctx->next = cctx_first;
		737	cctx_first = cctx;
		738	}
		739
		740	/* never call directly, always through the coro_state_transfer global variable */
		741	static void NOINLINE
		742	transfer (struct coro *prev, struct coro *next, int flags)
		743	{
		744	dSTACKLEVEL;
		745
		746	/* sometimes transfer is only called to set idle_sp */
		747	if (flags == TRANSFER_SET_STACKLEVEL)
		748	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		749	else if (prev != next)
		750	{
		751	coro_cctx *prev__cctx;
		752
		753	LOCK;
		754
		755	if (next->mainstack)
		756	{
		757	/* coroutine already started */
		758	SAVE (prev, flags);
		759	LOAD (next);
		760	}
		761	else
		762	{
		763	/* need to start coroutine */
		764	/* first get rid of the old state */
		765	SAVE (prev, -1);
		766	/* setup coroutine call */
		767	setup_coro (next);
		768	/* need a stack */
		769	next->cctx = 0;
		770	}
		771
		772	if (!prev->cctx)
		773	/* create a new empty context */
		774	Newz (0, prev->cctx, 1, coro_cctx);
		775
		776	prev__cctx = prev->cctx;
		777
		778	/* possibly "free" the cctx */
		779	if (prev__cctx->idle_sp == STACKLEVEL)
		780	{
		781	cctx_put (prev__cctx);
		782	prev->cctx = 0;
		783	}
		784
		785	if (!next->cctx)
		786	next->cctx = cctx_get ();
		787
		788	if (prev__cctx != next->cctx)
		789	{
		790	prev__cctx->top_env = PL_top_env;
		791	PL_top_env = next->cctx->top_env;
		792	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		793	}
		794
		795	free_coro_mortal ();
		796
		797	UNLOCK;
		798	}
		799	}
		800
		801	struct transfer_args
		802	{
		803	struct coro *prev, *next;
		804	int flags;
		805	};
		806
		807	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		808
		809	static void
		810	coro_state_destroy (struct coro *coro)
		811	{
		812	if (coro->refcnt--)
		813	return;
		814
		815	if (coro->mainstack && coro->mainstack != main_mainstack)
		816	{
		817	struct coro temp;
		818
		819	SAVE ((&temp), TRANSFER_SAVE_ALL);
		820	LOAD (coro);
		821
		822	coro_destroy_stacks ();
		823
		824	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		825
		826	coro->mainstack = 0;
		827	}
		828
		829	cctx_free (coro->cctx);
		830	SvREFCNT_dec (coro->args);
		831	Safefree (coro);
		832	}
		833
		834	static int
		835	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		836	{
		837	struct coro *coro = (struct coro *)mg->mg_ptr;
		838	mg->mg_ptr = 0;
		839
		840	coro_state_destroy (coro);
		841
		842	return 0;
		843	}
		844
		845	static int
		846	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		847	{
		848	struct coro *coro = (struct coro *)mg->mg_ptr;
		849
		850	++coro->refcnt;
		851
		852	return 0;
		853	}
		854
		855	static MGVTBL coro_state_vtbl = {
		856	0, 0, 0, 0,
		857	coro_state_clear,
		858	0,
		859	#ifdef MGf_DUP
		860	coro_state_dup,
		861	#else
		862	# define MGf_DUP 0
		863	#endif
		864	};
		865
		866	static struct coro *
		867	SvSTATE (SV *coro)
		868	{
		869	HV *stash;
		870	MAGIC *mg;
		871
		872	if (SvROK (coro))
		873	coro = SvRV (coro);
		874
		875	stash = SvSTASH (coro);
		876	if (stash != coro_stash && stash != coro_state_stash)
		877	{
		878	/* very slow, but rare, check */
		879	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		880	croak ("Coro::State object required");
		881	}
		882
		883	mg = SvMAGIC (coro);
		884	assert (mg->mg_type == PERL_MAGIC_ext);
		885	return (struct coro *)mg->mg_ptr;
		886	}
		887
		888	static void
		889	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		890	{
		891	ta->prev = SvSTATE (prev);
		892	ta->next = SvSTATE (next);
		893	ta->flags = flags;
		894	}
		895
		896	static void
		897	api_transfer (SV *prev, SV *next, int flags)
		898	{
		899	dTHX;
		900	struct transfer_args ta;
		901
		902	prepare_transfer (&ta, prev, next, flags);
		903	TRANSFER (ta);
		904	}
		905
		906	/** Coro ********************************************************************/
		907
		908	#define PRIO_MAX 3
		909	#define PRIO_HIGH 1
		910	#define PRIO_NORMAL 0
		911	#define PRIO_LOW -1
		912	#define PRIO_IDLE -3
		913	#define PRIO_MIN -4
		914
		915	/* for Coro.pm */
		916	static GV *coro_current, *coro_idle;
		917	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		918	static int coro_nready;
		919
		920	static void
		921	coro_enq (SV *sv)
		922	{
		923	int prio;
		924
		925	if (SvTYPE (sv) != SVt_PVHV)
		926	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		927
		928	prio = SvSTATE (sv)->prio;
		929
		930	av_push (coro_ready [prio - PRIO_MIN], sv);
		931	coro_nready++;
		932	}
		933
		934	static SV *
		935	coro_deq (int min_prio)
		936	{
		937	int prio = PRIO_MAX - PRIO_MIN;
		938
		939	min_prio -= PRIO_MIN;
		940	if (min_prio < 0)
		941	min_prio = 0;
		942
		943	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		944	if (AvFILLp (coro_ready [prio]) >= 0)
		945	{
		946	coro_nready--;
		947	return av_shift (coro_ready [prio]);
		948	}
		949
		950	return 0;
		951	}
		952
		953	static void
		954	api_ready (SV *coro)
		955	{
		956	dTHX;
		957
		958	if (SvROK (coro))
		959	coro = SvRV (coro);
		960
		961	LOCK;
		962	coro_enq (SvREFCNT_inc (coro));
		963	UNLOCK;
		964	}
		965
		966	static void
		967	prepare_schedule (struct transfer_args *ta)
		968	{
		969	SV *current, *prev, *next;
		970
		971	current = GvSV (coro_current);
		972
		973	for (;;)
		974	{
		975	LOCK;
		976	next = coro_deq (PRIO_MIN);
		977	UNLOCK;
		978
		979	if (next)
		980	break;
		981
		982	{
		983	dSP;
		984
		985	ENTER;
		986	SAVETMPS;
		987
		988	PUSHMARK (SP);
		989	PUTBACK;
		990	call_sv (GvSV (coro_idle), G_DISCARD);
		991
		992	FREETMPS;
		993	LEAVE;
		994	}
		995	}
		996
		997	prev = SvRV (current);
		998	SvRV (current) = next;
		999
		1000	/* free this only after the transfer */
		1001	LOCK;
		1002	free_coro_mortal ();
		1003	UNLOCK;
		1004	coro_mortal = prev;
		1005
		1006	ta->prev = SvSTATE (prev);
		1007	ta->next = SvSTATE (next);
		1008	ta->flags = TRANSFER_SAVE_ALL;
		1009	}
		1010
		1011	static void
		1012	prepare_cede (struct transfer_args *ta)
		1013	{
		1014	LOCK;
		1015	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
		1016	UNLOCK;
		1017
		1018	prepare_schedule (ta);
		1019	}
		1020
		1021	static void
		1022	api_schedule (void)
		1023	{
		1024	dTHX;
		1025	struct transfer_args ta;
		1026
		1027	prepare_schedule (&ta);
		1028	TRANSFER (ta);
		1029	}
		1030
		1031	static void
		1032	api_cede (void)
		1033	{
		1034	dTHX;
		1035	struct transfer_args ta;
		1036
		1037	prepare_cede (&ta);
		1038	TRANSFER (ta);
		1039	}
443		1040
444	MODULE = Coro::State PACKAGE = Coro::State	1041	MODULE = Coro::State PACKAGE = Coro::State
445		1042
446	PROTOTYPES: ENABLE	1043	PROTOTYPES: DISABLE
447		1044
448	BOOT:	1045	BOOT:
		1046	{
		1047	#ifdef USE_ITHREADS
		1048	MUTEX_INIT (&coro_mutex);
		1049	#endif
		1050	BOOT_PAGESIZE;
		1051
449	HV * stash = gv_stashpvn("Coro::State", 10, TRUE);	1052	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
450		1053
451	newCONSTSUB (stash, "SAVE_DEFAV", newSViv (SAVE_DEFAV));	1054	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
452	newCONSTSUB (stash, "SAVE_DEFSV", newSViv (SAVE_DEFSV));	1055	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
453	newCONSTSUB (stash, "SAVE_ERRSV", newSViv (SAVE_ERRSV));	1056	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
454		1057
455	if (!padlist_cache)	1058	main_mainstack = PL_mainstack;
456	padlist_cache = newHV ();
457		1059
458	Coro::State	1060	coroapi.ver = CORO_API_VERSION;
459	_newprocess(args)	1061	coroapi.transfer = api_transfer;
460	SV * args	1062
461	PROTOTYPE: $	1063	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1064	}
		1065
		1066	SV *
		1067	new (char *klass, ...)
462	CODE:	1068	CODE:
463	Coro__State coro;	1069	{
		1070	struct coro *coro;
		1071	HV *hv;
		1072	int i;
464		1073
465	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
466	croak ("Coro::State::_newprocess expects an arrayref");
467
468	New (0, coro, 1, struct coro);	1074	Newz (0, coro, 1, struct coro);
		1075	coro->args = newAV ();
469		1076
470	coro->mainstack = 0; /* actual work is done inside transfer */	1077	hv = newHV ();
471	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1078	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1079	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
472		1080
473	RETVAL = coro;	1081	for (i = 1; i < items; i++)
		1082	av_push (coro->args, newSVsv (ST (i)));
		1083	}
474	OUTPUT:	1084	OUTPUT:
475	RETVAL	1085	RETVAL
476		1086
477	void	1087	void
478	transfer(prev, next, flags = SAVE_DEFAV)	1088	_set_stacklevel (...)
479	Coro::State_or_hashref prev	1089	ALIAS:
480	Coro::State_or_hashref next	1090	Coro::State::transfer = 1
481	int flags	1091	Coro::schedule = 2
		1092	Coro::cede = 3
		1093	Coro::Cont::yield = 4
482	CODE:	1094	CODE:
		1095	{
		1096	struct transfer_args ta;
483		1097
484	if (prev != next)	1098	switch (ix)
485	{	1099	{
486	/*	1100	case 0:
487	* this could be done in newprocess which would lead to	1101	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
488	* extremely elegant and fast (just SAVE/LOAD)	1102	ta.next = 0;
489	* code here, but lazy allocation of stacks has also	1103	ta.flags = TRANSFER_SET_STACKLEVEL;
490	* some virtues and the overhead of the if() is nil.	1104	break;
491	*/	1105
492	if (next->mainstack)	1106	case 1:
		1107	if (items != 3)
		1108	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1109
		1110	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1111	break;
		1112
		1113	case 2:
		1114	prepare_schedule (&ta);
		1115	break;
		1116
		1117	case 3:
		1118	prepare_cede (&ta);
		1119	break;
		1120
		1121	case 4:
493	{	1122	{
494	SAVE (prev, flags);	1123	SV *yieldstack;
		1124	SV *sv;
		1125	AV *defav = GvAV (PL_defgv);
		1126
		1127	yieldstack = *hv_fetch (
		1128	(HV *)SvRV (GvSV (coro_current)),
		1129	"yieldstack", sizeof ("yieldstack") - 1,
		1130	0
495	LOAD (next);	1131	);
496	/* mark this state as in-use */	1132
497	next->mainstack = 0;	1133	/* set up @_ -- ugly */
498	next->tmps_ix = -2;	1134	av_clear (defav);
		1135	av_fill (defav, items - 1);
		1136	while (items--)
		1137	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1138
		1139	sv = av_pop ((AV *)SvRV (yieldstack));
		1140	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1141	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1142	ta.flags = 0;
		1143	SvREFCNT_dec (sv);
499	}	1144	}
500	else if (next->tmps_ix == -2)
501	{
502	croak ("tried to transfer to running coroutine");
503	}
504	else	1145	break;
505	{
506	/*
507	* emulate part of the perl startup here.
508	*/
509	UNOP myop;
510		1146
511	SAVE (prev, -1); /* first get rid of the old state */
512
513	init_stacks (); /* from perl.c */
514	SPAGAIN;
515
516	PL_op = (OP *)&myop;
517	/*PL_curcop = 0;*/
518	SvREFCNT_dec (GvAV (PL_defgv));
519	GvAV (PL_defgv) = next->args;
520
521	Zero(&myop, 1, UNOP);
522	myop.op_next = Nullop;
523	myop.op_flags = OPf_WANT_VOID;
524
525	PUSHMARK(SP);
526	XPUSHs ((SV*)get_cv(SUB_INIT, TRUE));
527	/*
528	* the next line is slightly wrong, as PL_op->op_next
529	* is actually being executed so we skip the first op.
530	* that doesn't matter, though, since it is only
531	* pp_nextstate and we never return...
532	* ah yes, and I don't care anyways ;)
533	*/
534	PUTBACK;
535	PL_op = pp_entersub(aTHX);
536	SPAGAIN;
537
538	ENTER; /* necessary e.g. for dounwind */
539	}
540	}	1147	}
541		1148
		1149	TRANSFER (ta);
		1150	}
		1151
542	void	1152	void
543	DESTROY(coro)	1153	_clone_state_from (SV *dst, SV *src)
544	Coro::State coro	1154	CODE:
		1155	{
		1156	struct coro *coro_src = SvSTATE (src);
		1157
		1158	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1159
		1160	++coro_src->refcnt;
		1161	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1162	}
		1163
		1164	void
		1165	_exit (code)
		1166	int code
		1167	PROTOTYPE: $
		1168	CODE:
		1169	_exit (code);
		1170
		1171	int
		1172	cctx_count ()
		1173	CODE:
		1174	RETVAL = cctx_count;
		1175	OUTPUT:
		1176	RETVAL
		1177
		1178	int
		1179	cctx_idle ()
		1180	CODE:
		1181	RETVAL = cctx_idle;
		1182	OUTPUT:
		1183	RETVAL
		1184
		1185	MODULE = Coro::State PACKAGE = Coro
		1186
		1187	BOOT:
		1188	{
		1189	int i;
		1190
		1191	coro_stash = gv_stashpv ("Coro", TRUE);
		1192
		1193	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1194	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1195	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1196	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1197	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1198	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1199
		1200	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1201	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1202
		1203	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1204	coro_ready[i] = newAV ();
		1205
		1206	{
		1207	SV *sv = perl_get_sv("Coro::API", 1);
		1208
		1209	coroapi.schedule = api_schedule;
		1210	coroapi.cede = api_cede;
		1211	coroapi.ready = api_ready;
		1212	coroapi.nready = &coro_nready;
		1213	coroapi.current = coro_current;
		1214
		1215	GCoroAPI = &coroapi;
		1216	sv_setiv (sv, (IV)&coroapi);
		1217	SvREADONLY_on (sv);
		1218	}
		1219	}
		1220
		1221	int
		1222	prio (Coro::State coro, int newprio = 0)
		1223	ALIAS:
		1224	nice = 1
545	CODE:	1225	CODE:
		1226	{
		1227	RETVAL = coro->prio;
546		1228
547	if (coro->mainstack)	1229	if (items > 1)
548	{	1230	{
549	struct coro temp;	1231	if (ix)
		1232	newprio += coro->prio;
550		1233
551	SAVE(aTHX_ (&temp), SAVE_ALL);	1234	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
552	LOAD(aTHX_ coro);	1235	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
553		1236
554	destroy_stacks ();	1237	coro->prio = newprio;
555
556	LOAD((&temp)); /* this will get rid of defsv etc.. */
557	}	1238	}
558		1239	}
559	Safefree (coro);
560		1240
561	void	1241	void
562	flush()	1242	ready (SV *self)
		1243	PROTOTYPE: $
563	CODE:	1244	CODE:
564	#ifdef MAY_FLUSH	1245	api_ready (self);
565	flush_padlist_cache ();
566	#endif
567		1246
		1247	int
		1248	nready (...)
		1249	PROTOTYPE:
		1250	CODE:
		1251	RETVAL = coro_nready;
		1252	OUTPUT:
		1253	RETVAL
568		1254
		1255	MODULE = Coro::State PACKAGE = Coro::AIO
		1256
		1257	SV *
		1258	_get_state ()
		1259	CODE:
		1260	{
		1261	struct {
		1262	int errorno;
		1263	int laststype;
		1264	int laststatval;
		1265	Stat_t statcache;
		1266	} data;
		1267
		1268	data.errorno = errno;
		1269	data.laststype = PL_laststype;
		1270	data.laststatval = PL_laststatval;
		1271	data.statcache = PL_statcache;
		1272
		1273	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1274	}
		1275	OUTPUT:
		1276	RETVAL
		1277
		1278	void
		1279	_set_state (char *data_)
		1280	PROTOTYPE: $
		1281	CODE:
		1282	{
		1283	struct {
		1284	int errorno;
		1285	int laststype;
		1286	int laststatval;
		1287	Stat_t statcache;
		1288	} *data = (void *)data_;
		1289
		1290	errno = data->errorno;
		1291	PL_laststype = data->laststype;
		1292	PL_laststatval = data->laststatval;
		1293	PL_statcache = data->statcache;
		1294	}

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