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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.19 by root, Sun Jul 29 01:11:41 2001 UTC vs.
Revision 1.91 by root, Sat Nov 25 01:14:11 2006 UTC

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

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