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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.18 by root, Thu Jul 26 03:46:15 2001 UTC vs.
Revision 1.97 by root, Sun Nov 26 21:21:14 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 <stdio.h>
		33	#include <errno.h>
		34
		35	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		36	# undef STACKGUARD
		37	#endif
		38
		39	#ifndef STACKGUARD
		40	# define STACKGUARD 0
		41	#endif
6		42
7	#ifdef HAVE_MMAP	43	#ifdef HAVE_MMAP
8	# include <unistd.h>	44	# include <unistd.h>
9	# include <sys/mman.h>	45	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	46	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	47	# ifdef MAP_ANON
		48	# define MAP_ANONYMOUS MAP_ANON
13	# else	49	# else
14	# undef HAVE_MMAP	50	# undef HAVE_MMAP
15	# endif	51	# endif
16	# endif	52	# endif
		53	# include <limits.h>
		54	# ifndef PAGESIZE
		55	# define PAGESIZE pagesize
		56	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		57	static long pagesize;
		58	# else
		59	# define BOOT_PAGESIZE
17	#endif	60	# endif
		61	#endif
18		62
19	#define MAY_FLUSH /* increases codesize */	63	/* The next macro should declare a variable stacklevel that contains and approximation
		64	* to the current C stack pointer. Its property is that it changes with each call
		65	* and should be unique. */
		66	#define dSTACKLEVEL int stacklevel
		67	#define STACKLEVEL ((void *)&stacklevel)
20		68
21	/* perl-related */	69	#define IN_DESTRUCT (PL_main_cv == Nullcv)
22	#define TRANSFER_SAVE_DEFAV 0x00000001	70
23	#define TRANSFER_SAVE_DEFSV 0x00000002	71	#include "CoroAPI.h"
24	#define TRANSFER_SAVE_ERRSV 0x00000004	72
25	/* c-related */	73	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
26	#define TRANSFER_SAVE_CCTXT 0x00000008	74
27	#ifdef CORO_LAZY_STACK	75	#ifdef USE_ITHREADS
28	# define TRANSFER_LAZY_STACK 0x00000010	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)
29	#else	79	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	80	# define LOCK (void)0
		81	# define UNLOCK (void)0
31	#endif	82	#endif
32		83
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	84	static struct CoroAPI coroapi;
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	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 */
35		88
36	#define SUB_INIT "Coro::State::initialize"	89	/* this is a structure representing a c-level coroutine */
37	#define UCORO_STATE "_coro_state"	90	typedef struct coro_stack {
		91	struct coro_stack *next;
38		92
39	/* The next macro should delcare a variable stacklevel that contains and approximation	93	/* the stack */
40	* to the current C stack pointer. It's property is that it changes with each call
41	* and should be unique. */
42	#define dSTACKLEVEL void *stacklevel = &stacklevel
43
44	#define labs(l) ((l) >= 0 ? (l) : -(l))
45
46	/* this is actually not only the c stack but also c registers etc... */
47	typedef struct {
48	int refcnt; /* pointer reference counter */
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51
52	coro_context cctx;
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	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		99	JMPENV *top_env;
		100	coro_context cctx;
56	} coro_stack;	101	} coro_stack;
57		102
		103	/* this is a structure representing a perl-level coroutine */
58	struct coro {	104	struct coro {
59	/* the optional C context */	105	/* the c coroutine allocated to this perl coroutine, if any */
60	coro_stack *stack;	106	coro_stack *stack;
61	void *cursp;	107
		108	/* data associated with this coroutine (initial args) */
		109	AV *args;
62	int gencnt;	110	int refcnt;
63		111
64	/* optionally saved, might be zero */	112	/* optionally saved, might be zero */
65	AV *defav;	113	AV *defav;
66	SV *defsv;	114	SV *defsv;
67	SV *errsv;	115	SV *errsv;
68		116
69	/* saved global state not related to stacks */	117	/* saved global state not related to stacks */
70	U8 dowarn;	118	U8 dowarn;
		119	I32 in_eval;
71		120
72	/* the stacks and related info (callchain etc..) */	121	/* the stacks and related info (callchain etc..) */
73	PERL_SI *curstackinfo;	122	PERL_SI *curstackinfo;
74	AV *curstack;	123	AV *curstack;
75	AV *mainstack;	124	AV *mainstack;
76	SV **stack_sp;	125	SV **stack_sp;
77	OP *op;	126	OP *op;
78	SV **curpad;	127	SV **curpad;
		128	AV *comppad;
		129	CV *compcv;
79	SV **stack_base;	130	SV **stack_base;
80	SV **stack_max;	131	SV **stack_max;
81	SV **tmps_stack;	132	SV **tmps_stack;
82	I32 tmps_floor;	133	I32 tmps_floor;
83	I32 tmps_ix;	134	I32 tmps_ix;
…		…
92	I32 savestack_ix;	143	I32 savestack_ix;
93	I32 savestack_max;	144	I32 savestack_max;
94	OP **retstack;	145	OP **retstack;
95	I32 retstack_ix;	146	I32 retstack_ix;
96	I32 retstack_max;	147	I32 retstack_max;
		148	PMOP *curpm;
97	COP *curcop;	149	COP *curcop;
98	JMPENV start_env;
99	JMPENV *top_env;
100		150
101	/* data associated with this coroutine (initial args) */	151	/* coro process data */
102	AV *args;	152	int prio;
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 is probably cleaner, but also slower? */
		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;
		273	PL_in_eval = c->in_eval;
293		274
294	PL_curstackinfo = c->curstackinfo;	275	PL_curstackinfo = c->curstackinfo;
295	PL_curstack = c->curstack;	276	PL_curstack = c->curstack;
296	PL_mainstack = c->mainstack;	277	PL_mainstack = c->mainstack;
297	PL_stack_sp = c->stack_sp;	278	PL_stack_sp = c->stack_sp;
298	PL_op = c->op;	279	PL_op = c->op;
299	PL_curpad = c->curpad;	280	PL_curpad = c->curpad;
		281	PL_comppad = c->comppad;
		282	PL_compcv = c->compcv;
300	PL_stack_base = c->stack_base;	283	PL_stack_base = c->stack_base;
301	PL_stack_max = c->stack_max;	284	PL_stack_max = c->stack_max;
302	PL_tmps_stack = c->tmps_stack;	285	PL_tmps_stack = c->tmps_stack;
303	PL_tmps_floor = c->tmps_floor;	286	PL_tmps_floor = c->tmps_floor;
304	PL_tmps_ix = c->tmps_ix;	287	PL_tmps_ix = c->tmps_ix;
…		…
310	PL_scopestack_ix = c->scopestack_ix;	293	PL_scopestack_ix = c->scopestack_ix;
311	PL_scopestack_max = c->scopestack_max;	294	PL_scopestack_max = c->scopestack_max;
312	PL_savestack = c->savestack;	295	PL_savestack = c->savestack;
313	PL_savestack_ix = c->savestack_ix;	296	PL_savestack_ix = c->savestack_ix;
314	PL_savestack_max = c->savestack_max;	297	PL_savestack_max = c->savestack_max;
		298	#if PERL_VERSION < 9
315	PL_retstack = c->retstack;	299	PL_retstack = c->retstack;
316	PL_retstack_ix = c->retstack_ix;	300	PL_retstack_ix = c->retstack_ix;
317	PL_retstack_max = c->retstack_max;	301	PL_retstack_max = c->retstack_max;
		302	#endif
		303	PL_curpm = c->curpm;
318	PL_curcop = c->curcop;	304	PL_curcop = c->curcop;
319	PL_start_env = c->start_env;
320	PL_top_env = c->top_env;
321		305
322	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	306	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
323	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	307	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
324	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	308	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
325		309
…		…
332	{	316	{
333	AV *padlist = (AV *)POPs;	317	AV *padlist = (AV *)POPs;
334		318
335	if (padlist)	319	if (padlist)
336	{	320	{
337	put_padlist (cv); /* mark this padlist as available */	321	put_padlist (aTHX_ cv); /* mark this padlist as available */
338	CvPADLIST(cv) = padlist;	322	CvPADLIST(cv) = padlist;
339	#ifdef USE_THREADS
340	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
341	#endif
342	}	323	}
343		324
344	++CvDEPTH(cv);	325	++CvDEPTH(cv);
345	}	326	}
346		327
…		…
364		345
365	PUSHs (Nullsv);	346	PUSHs (Nullsv);
366	/* this loop was inspired by pp_caller */	347	/* this loop was inspired by pp_caller */
367	for (;;)	348	for (;;)
368	{	349	{
369	do	350	while (cxix >= 0)
370	{	351	{
371	PERL_CONTEXT *cx = &ccstk[cxix--];	352	PERL_CONTEXT *cx = &ccstk[cxix--];
372		353
373	if (CxTYPE(cx) == CXt_SUB)	354	if (CxTYPE(cx) == CXt_SUB)
374	{	355	{
375	CV *cv = cx->blk_sub.cv;	356	CV *cv = cx->blk_sub.cv;
376	if (CvDEPTH(cv))	357	if (CvDEPTH(cv))
377	{	358	{
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);	359	EXTEND (SP, CvDEPTH(cv)*2);
384		360
385	while (--CvDEPTH(cv))	361	while (--CvDEPTH(cv))
386	{	362	{
387	/* this tells the restore code to increment CvDEPTH */	363	/* this tells the restore code to increment CvDEPTH */
…		…
390	}	366	}
391		367
392	PUSHs ((SV *)CvPADLIST(cv));	368	PUSHs ((SV *)CvPADLIST(cv));
393	PUSHs ((SV *)cv);	369	PUSHs ((SV *)cv);
394		370
395	get_padlist (cv); /* this is a monster */	371	get_padlist (aTHX_ cv);
396	}	372	}
397	}	373	}
		374	#ifdef CXt_FORMAT
398	else if (CxTYPE(cx) == CXt_FORMAT)	375	else if (CxTYPE(cx) == CXt_FORMAT)
399	{	376	{
400	/* I never used formats, so how should I know how these are implemented? */	377	/* I never used formats, so how should I know how these are implemented? */
401	/* my bold guess is as a simple, plain sub... */	378	/* my bold guess is as a simple, plain sub... */
402	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
403	}	380	}
		381	#endif
404	}	382	}
405	while (cxix >= 0);
406		383
407	if (top_si->si_type == PERLSI_MAIN)	384	if (top_si->si_type == PERLSI_MAIN)
408	break;	385	break;
409		386
410	top_si = top_si->si_prev;	387	top_si = top_si->si_prev;
…		…
417		394
418	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	395	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
419	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	396	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
420	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	397	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
421		398
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
427	c->dowarn = PL_dowarn;	399	c->dowarn = PL_dowarn;
		400	c->in_eval = PL_in_eval;
428		401
429	c->curstackinfo = PL_curstackinfo;	402	c->curstackinfo = PL_curstackinfo;
430	c->curstack = PL_curstack;	403	c->curstack = PL_curstack;
431	c->mainstack = PL_mainstack;	404	c->mainstack = PL_mainstack;
432	c->stack_sp = PL_stack_sp;	405	c->stack_sp = PL_stack_sp;
433	c->op = PL_op;	406	c->op = PL_op;
434	c->curpad = PL_curpad;	407	c->curpad = PL_curpad;
		408	c->comppad = PL_comppad;
		409	c->compcv = PL_compcv;
435	c->stack_base = PL_stack_base;	410	c->stack_base = PL_stack_base;
436	c->stack_max = PL_stack_max;	411	c->stack_max = PL_stack_max;
437	c->tmps_stack = PL_tmps_stack;	412	c->tmps_stack = PL_tmps_stack;
438	c->tmps_floor = PL_tmps_floor;	413	c->tmps_floor = PL_tmps_floor;
439	c->tmps_ix = PL_tmps_ix;	414	c->tmps_ix = PL_tmps_ix;
…		…
445	c->scopestack_ix = PL_scopestack_ix;	420	c->scopestack_ix = PL_scopestack_ix;
446	c->scopestack_max = PL_scopestack_max;	421	c->scopestack_max = PL_scopestack_max;
447	c->savestack = PL_savestack;	422	c->savestack = PL_savestack;
448	c->savestack_ix = PL_savestack_ix;	423	c->savestack_ix = PL_savestack_ix;
449	c->savestack_max = PL_savestack_max;	424	c->savestack_max = PL_savestack_max;
		425	#if PERL_VERSION < 9
450	c->retstack = PL_retstack;	426	c->retstack = PL_retstack;
451	c->retstack_ix = PL_retstack_ix;	427	c->retstack_ix = PL_retstack_ix;
452	c->retstack_max = PL_retstack_max;	428	c->retstack_max = PL_retstack_max;
		429	#endif
		430	c->curpm = PL_curpm;
453	c->curcop = PL_curcop;	431	c->curcop = PL_curcop;
454	c->start_env = PL_start_env;
455	c->top_env = PL_top_env;
456	}	432	}
457		433
458	/*	434	/*
459	* allocate various perl stacks. This is an exact copy	435	* allocate various perl stacks. This is an exact copy
460	* of perl.c:init_stacks, except that it uses less memory	436	* of perl.c:init_stacks, except that it uses less memory
461	* on the assumption that coroutines do not usually need	437	* on the (sometimes correct) assumption that coroutines do
462	* a lot of stackspace.	438	* not usually need a lot of stackspace.
463	*/	439	*/
464	STATIC void	440	static void
465	coro_init_stacks (pTHX)	441	coro_init_stacks (pTHX)
466	{	442	{
		443	LOCK;
		444
467	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	445	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
468	PL_curstackinfo->si_type = PERLSI_MAIN;	446	PL_curstackinfo->si_type = PERLSI_MAIN;
469	PL_curstack = PL_curstackinfo->si_stack;	447	PL_curstack = PL_curstackinfo->si_stack;
470	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	448	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
471		449
…		…
480		458
481	New(54,PL_markstack,16,I32);	459	New(54,PL_markstack,16,I32);
482	PL_markstack_ptr = PL_markstack;	460	PL_markstack_ptr = PL_markstack;
483	PL_markstack_max = PL_markstack + 16;	461	PL_markstack_max = PL_markstack + 16;
484		462
		463	#ifdef SET_MARK_OFFSET
485	SET_MARK_OFFSET;	464	SET_MARK_OFFSET;
		465	#endif
486		466
487	New(54,PL_scopestack,16,I32);	467	New(54,PL_scopestack,16,I32);
488	PL_scopestack_ix = 0;	468	PL_scopestack_ix = 0;
489	PL_scopestack_max = 16;	469	PL_scopestack_max = 16;
490		470
491	New(54,PL_savestack,96,ANY);	471	New(54,PL_savestack,96,ANY);
492	PL_savestack_ix = 0;	472	PL_savestack_ix = 0;
493	PL_savestack_max = 96;	473	PL_savestack_max = 96;
494		474
		475	#if PERL_VERSION < 9
495	New(54,PL_retstack,8,OP*);	476	New(54,PL_retstack,8,OP*);
496	PL_retstack_ix = 0;	477	PL_retstack_ix = 0;
497	PL_retstack_max = 8;	478	PL_retstack_max = 8;
		479	#endif
		480
		481	UNLOCK;
498	}	482	}
499		483
500	/*	484	/*
501	* destroy the stacks, the callchain etc...	485	* destroy the stacks, the callchain etc...
502	* still there is a memleak of 128 bytes...
503	*/	486	*/
504	STATIC void	487	static void
505	destroy_stacks(pTHX)	488	destroy_stacks(pTHX)
506	{	489	{
		490	if (!IN_DESTRUCT)
		491	{
507	/* is this ugly, I ask? */	492	/* is this ugly, I ask? */
508	while (PL_scopestack_ix)	493	LEAVE_SCOPE (0);
509	LEAVE;
510		494
511	/* sure it is, but more important: is it correct?? :/ */	495	/* 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;	496	FREETMPS;
		497
		498	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		499	}
514		500
515	while (PL_curstackinfo->si_next)	501	while (PL_curstackinfo->si_next)
516	PL_curstackinfo = PL_curstackinfo->si_next;	502	PL_curstackinfo = PL_curstackinfo->si_next;
517		503
518	while (PL_curstackinfo)	504	while (PL_curstackinfo)
519	{	505	{
520	PERL_SI *p = PL_curstackinfo->si_prev;	506	PERL_SI *p = PL_curstackinfo->si_prev;
521		507
522	{	508	{ /*D*//*remove*/
523	dSP;	509	dSP;
524	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	510	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
525	PUTBACK; /* possibly superfluous */	511	PUTBACK; /* possibly superfluous */
526	}	512	}
527		513
528	dounwind(-1);	514	if (!IN_DESTRUCT)
529		515	{
		516	dounwind (-1);/*D*//*remove*/
530	SvREFCNT_dec(PL_curstackinfo->si_stack);	517	SvREFCNT_dec (PL_curstackinfo->si_stack);
		518	}
		519
531	Safefree(PL_curstackinfo->si_cxstack);	520	Safefree (PL_curstackinfo->si_cxstack);
532	Safefree(PL_curstackinfo);	521	Safefree (PL_curstackinfo);
533	PL_curstackinfo = p;	522	PL_curstackinfo = p;
534	}	523	}
535		524
536	Safefree(PL_tmps_stack);	525	Safefree (PL_tmps_stack);
537	Safefree(PL_markstack);	526	Safefree (PL_markstack);
538	Safefree(PL_scopestack);	527	Safefree (PL_scopestack);
539	Safefree(PL_savestack);	528	Safefree (PL_savestack);
		529	#if PERL_VERSION < 9
540	Safefree(PL_retstack);	530	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	531	#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	}	532	}
571		533
572	static void	534	static void
573	deallocate_stack (Coro__State ctx)	535	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	{	536	{
600	/*	537	/*
601	* emulate part of the perl startup here.	538	* emulate part of the perl startup here.
602	*/	539	*/
		540	dTHX;
603	dSP;	541	dSP;
604	Coro__State ctx = (Coro__State)arg;	542	UNOP myop;
605	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);	543	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
606		544
607	coro_init_stacks (aTHX);	545	coro_init_stacks (aTHX);
608	JMPENV_BOOTSTRAP;	546	/*PL_curcop = 0;*/
		547	/*PL_in_eval = PL_in_eval;*/ /* inherit */
		548	SvREFCNT_dec (GvAV (PL_defgv));
		549	GvAV (PL_defgv) = coro->args; coro->args = 0;
		550
609	SPAGAIN;	551	SPAGAIN;
610		552
611	/*PL_curcop = 0;*/	553	Zero (&myop, 1, UNOP);
612	SvREFCNT_dec (GvAV (PL_defgv));	554	myop.op_next = Nullop;
613	GvAV (PL_defgv) = ctx->args;	555	myop.op_flags = OPf_WANT_VOID;
614		556
615	if (ctx->stack)	557	PL_op = (OP *)&myop;
		558
		559	PUSHMARK(SP);
		560	XPUSHs (sub_init);
		561	PUTBACK;
		562	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		563	SPAGAIN;
		564
		565	ENTER; /* necessary e.g. for dounwind */
		566	}
		567
		568	static void
		569	free_coro_mortal ()
		570	{
		571	if (coro_mortal)
616	{	572	{
617	ctx->cursp = 0;	573	dTHX;
618		574
619	PUSHMARK(SP);	575	SvREFCNT_dec (coro_mortal);
620	PUTBACK;	576	coro_mortal = 0;
621	(void) call_sv (sub_init, G_VOID|G_NOARGS);
622	croak ("FATAL: CCTXT coroutine returned!");
623	}	577	}
624	else
625	{
626	UNOP myop;
627
628	PL_op = (OP *)&myop;
629
630	Zero(&myop, 1, UNOP);
631	myop.op_next = Nullop;
632	myop.op_flags = OPf_WANT_VOID;
633
634	PUSHMARK(SP);
635	XPUSHs (sub_init);
636	/*
637	* the next line is slightly wrong, as PL_op->op_next
638	* is actually being executed so we skip the first op.
639	* that doesn't matter, though, since it is only
640	* pp_nextstate and we never return...
641	* ah yes, and I don't care anyways ;)
642	*/
643	PUTBACK;
644	PL_op = pp_entersub();
645	SPAGAIN;
646
647	ENTER; /* necessary e.g. for dounwind */
648	}
649	}	578	}
650		579
651	static void	580	static void
652	continue_coro (void *arg)	581	coro_run (void *arg)
653	{	582	{
654	/*	583	/*
655	* this is a _very_ stripped down perl interpreter ;)	584	* this is a _very_ stripped down perl interpreter ;)
656	*/	585	*/
657	Coro__State ctx = (Coro__State)arg;	586	dTHX;
		587	int ret;
658		588
659	ctx->cursp = 0;	589	UNLOCK;
660	PL_op = PL_op->op_next;	590
661	CALLRUNOPS(aTHX);	591	PL_top_env = &PL_start_env;
662	/*NORETURN*/	592
		593	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV ((coro_stack *)arg));
		594	sv_setiv (get_sv ("Coro::State::cctx_restartop", FALSE), PTR2IV (PL_op));
		595
		596	/* continue at cctx_init, without entersub */
		597	PL_restartop = CvSTART (get_cv ("Coro::State::cctx_init", FALSE));
		598
		599	/* somebody will hit me for both perl_run and PL_restartop */
		600	ret = perl_run (aTHX_ PERL_GET_CONTEXT);
		601	printf ("ret %d\n", ret);//D
		602
		603	fputs ("FATAL: C coroutine fell over the edge of the world, aborting.\n", stderr);
663	abort ();	604	abort ();
664	}	605	}
665		606
666	STATIC void	607	static coro_stack *
		608	stack_new ()
		609	{
		610	coro_stack *stack;
		611
		612	New (0, stack, 1, coro_stack);
		613
		614	#if HAVE_MMAP
		615
		616	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		617	/* mmap suppsedly does allocate-on-write for us */
		618	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		619
		620	if (stack->sptr == (void *)-1)
		621	{
		622	perror ("FATAL: unable to mmap stack for coroutine");
		623	_exit (EXIT_FAILURE);
		624	}
		625
		626	# if STACKGUARD
		627	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		628	# endif
		629
		630	#else
		631
		632	stack->ssize = STACKSIZE * (long)sizeof (long);
		633	New (0, stack->sptr, STACKSIZE, long);
		634
		635	if (!stack->sptr)
		636	{
		637	perror (stderr, "FATAL: unable to malloc stack for coroutine");
		638	_exit (EXIT_FAILURE);
		639	}
		640
		641	#endif
		642
		643	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);
		644
		645	return stack;
		646	}
		647
		648	static void
		649	stack_free (coro_stack *stack)
		650	{
		651	if (!stack)
		652	return;
		653
		654	#if HAVE_MMAP
		655	munmap (stack->sptr, stack->ssize);
		656	#else
		657	Safefree (stack->sptr);
		658	#endif
		659
		660	Safefree (stack);
		661	}
		662
		663	static coro_stack *stack_first;
		664
		665	static coro_stack *
		666	stack_get ()
		667	{
		668	coro_stack *stack;
		669
		670	if (stack_first)
		671	{
		672	stack = stack_first;
		673	stack_first = stack->next;
		674	}
		675	else
		676	{
		677	stack = stack_new ();
		678	PL_op = PL_op->op_next;
		679	}
		680
		681	return stack;
		682	}
		683
		684	static void
		685	stack_put (coro_stack *stack)
		686	{
		687	stack->next = stack_first;
		688	stack_first = stack;
		689	}
		690
		691	/* never call directly, always through the coro_state_transfer global variable */
		692	static void
667	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	693	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)
668	{	694	{
669	dSP;
670	dSTACKLEVEL;	695	dSTACKLEVEL;
671		696
		697	/* sometimes transfer is only called to set idle_sp */
		698	if (flags == TRANSFER_SET_STACKLEVEL)
		699	((coro_stack *)prev)->idle_sp = STACKLEVEL;
672	if (prev != next)	700	else if (prev != next)
673	{	701	{
		702	coro_stack *prev__stack;
		703
		704	LOCK;
		705
674	if (next->mainstack)	706	if (next->mainstack)
675	{	707	{
		708	/* coroutine already started */
676	SAVE (prev, flags);	709	SAVE (prev, flags);
677	LOAD (next);	710	LOAD (next);
678
679	/* mark this state as in-use */
680	next->mainstack = 0;
681	next->tmps_ix = -2;
682
683	/* stacklevel changed? if yes, grab the stack for us! */
684	if (flags & TRANSFER_SAVE_CCTXT)
685	{
686	if (!prev->stack)
687	allocate_stack (prev, 0);
688	else if (prev->cursp != stacklevel
689	&& prev->stack->usecnt > 1)
690	{
691	prev->gencnt = ++prev->stack->gencnt;
692	prev->stack->usecnt = 1;
693	}
694
695	/* has our stack been invalidated? */
696	if (next->stack && next->stack->gencnt != next->gencnt)
697	{
698	deallocate_stack (next);
699	allocate_stack (next, 1);
700	coro_create (&(next->stack->cctx),
701	continue_coro, (void *)next,
702	next->stack->sptr, labs (next->stack->ssize));
703	}
704
705	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
706	}
707
708	}	711	}
709	else if (next->tmps_ix == -2)
710	croak ("tried to transfer to running coroutine");
711	else	712	else
712	{	713	{
		714	/* need to start coroutine */
713	SAVE (prev, -1); /* first get rid of the old state */	715	/* first get rid of the old state */
714		716	SAVE (prev, -1);
715	if (flags & TRANSFER_SAVE_CCTXT)	717	/* setup coroutine call */
716	{
717	if (!prev->stack)
718	allocate_stack (prev, 0);
719
720	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
721	{
722	setup_coro (next);
723
724	prev->stack->refcnt++;
725	prev->stack->usecnt++;
726	next->stack = prev->stack;
727	next->gencnt = prev->gencnt;
728	}
729	else
730	{
731	allocate_stack (next, 1);
732	coro_create (&(next->stack->cctx),
733	setup_coro, (void *)next,
734	next->stack->sptr, labs (next->stack->ssize));
735	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
736	}
737	}
738	else
739	setup_coro (next);	718	setup_coro (next);
		719	/* need a stack */
		720	next->stack = 0;
740	}	721	}
		722
		723	if (!prev->stack)
		724	/* create a new empty context */
		725	Newz (0, prev->stack, 1, coro_stack);
		726
		727	prev__stack = prev->stack;
		728
		729	/* possibly "free" the stack */
		730	if (prev__stack->idle_sp == STACKLEVEL)
		731	{
		732	stack_put (prev__stack);
		733	prev->stack = 0;
		734	}
		735
		736	if (!next->stack)
		737	next->stack = stack_get ();
		738
		739	if (prev__stack != next->stack)
		740	{
		741	prev__stack->top_env = PL_top_env;
		742	PL_top_env = next->stack->top_env;
		743	coro_transfer (&prev__stack->cctx, &next->stack->cctx);
		744	}
		745
		746	free_coro_mortal ();
		747
		748	UNLOCK;
741	}	749	}
		750	}
742		751
743	next->cursp = stacklevel;	752	/* use this function pointer to call the above function */
		753	/* this is done to increase chances of the compiler not inlining the call */
		754	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
		755	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
		756
		757	struct transfer_args
		758	{
		759	struct coro *prev, *next;
		760	int flags;
		761	};
		762
		763	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)
		764
		765	static void
		766	coro_state_destroy (struct coro *coro)
		767	{
		768	if (coro->refcnt--)
		769	return;
		770
		771	if (coro->mainstack && coro->mainstack != main_mainstack)
		772	{
		773	struct coro temp;
		774
		775	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
		776	LOAD (aTHX_ coro);
		777
		778	destroy_stacks (aTHX);
		779
		780	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		781
		782	coro->mainstack = 0;
		783	}
		784
		785	stack_free (coro->stack);
		786	SvREFCNT_dec (coro->args);
		787	Safefree (coro);
		788	}
		789
		790	static int
		791	coro_state_clear (SV *sv, MAGIC *mg)
		792	{
		793	struct coro *coro = (struct coro *)mg->mg_ptr;
		794	mg->mg_ptr = 0;
		795
		796	coro_state_destroy (coro);
		797
		798	return 0;
		799	}
		800
		801	static int
		802	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)
		803	{
		804	struct coro *coro = (struct coro *)mg->mg_ptr;
		805
		806	++coro->refcnt;
		807
		808	return 0;
		809	}
		810
		811	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };
		812
		813	static struct coro *
		814	SvSTATE (SV *coro)
		815	{
		816	HV *stash;
		817	MAGIC *mg;
		818
		819	if (SvROK (coro))
		820	coro = SvRV (coro);
		821
		822	stash = SvSTASH (coro);
		823	if (stash != coro_stash && stash != coro_state_stash)
		824	{
		825	/* very slow, but rare, check */
		826	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		827	croak ("Coro::State object required");
		828	}
		829
		830	mg = SvMAGIC (coro);
		831	assert (mg->mg_type == PERL_MAGIC_ext);
		832	return (struct coro *)mg->mg_ptr;
		833	}
		834
		835	static void
		836	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev, SV *next, int flags)
		837	{
		838	ta->prev = SvSTATE (prev);
		839	ta->next = SvSTATE (next);
		840	ta->flags = flags;
		841	}
		842
		843	static void
		844	api_transfer (SV *prev, SV *next, int flags)
		845	{
		846	dTHX;
		847	struct transfer_args ta;
		848
		849	prepare_transfer (aTHX_ &ta, prev, next, flags);
		850	TRANSFER (ta);
		851	}
		852
		853	/** Coro ********************************************************************/
		854
		855	#define PRIO_MAX 3
		856	#define PRIO_HIGH 1
		857	#define PRIO_NORMAL 0
		858	#define PRIO_LOW -1
		859	#define PRIO_IDLE -3
		860	#define PRIO_MIN -4
		861
		862	/* for Coro.pm */
		863	static GV *coro_current, *coro_idle;
		864	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		865	static int coro_nready;
		866
		867	static void
		868	coro_enq (pTHX_ SV *sv)
		869	{
		870	int prio;
		871
		872	if (SvTYPE (sv) != SVt_PVHV)
		873	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		874
		875	prio = SvSTATE (sv)->prio;
		876
		877	av_push (coro_ready [prio - PRIO_MIN], sv);
		878	coro_nready++;
		879	}
		880
		881	static SV *
		882	coro_deq (pTHX_ int min_prio)
		883	{
		884	int prio = PRIO_MAX - PRIO_MIN;
		885
		886	min_prio -= PRIO_MIN;
		887	if (min_prio < 0)
		888	min_prio = 0;
		889
		890	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		891	if (AvFILLp (coro_ready [prio]) >= 0)
		892	{
		893	coro_nready--;
		894	return av_shift (coro_ready [prio]);
		895	}
		896
		897	return 0;
		898	}
		899
		900	static void
		901	api_ready (SV *coro)
		902	{
		903	dTHX;
		904
		905	if (SvROK (coro))
		906	coro = SvRV (coro);
		907
		908	LOCK;
		909	coro_enq (aTHX_ SvREFCNT_inc (coro));
		910	UNLOCK;
		911	}
		912
		913	static void
		914	prepare_schedule (aTHX_ struct transfer_args *ta)
		915	{
		916	SV *current, *prev, *next;
		917
		918	LOCK;
		919
		920	current = GvSV (coro_current);
		921
		922	for (;;)
		923	{
		924	LOCK;
		925
		926	next = coro_deq (aTHX_ PRIO_MIN);
		927
		928	if (next)
		929	break;
		930
		931	UNLOCK;
		932
		933	{
		934	dSP;
		935
		936	ENTER;
		937	SAVETMPS;
		938
		939	PUSHMARK (SP);
		940	PUTBACK;
		941	call_sv (GvSV (coro_idle), G_DISCARD);
		942
		943	FREETMPS;
		944	LEAVE;
		945	}
		946	}
		947
		948	prev = SvRV (current);
		949	SvRV (current) = next;
		950
		951	/* free this only after the transfer */
		952	free_coro_mortal ();
		953	coro_mortal = prev;
		954
		955	ta->prev = SvSTATE (prev);
		956	ta->next = SvSTATE (next);
		957	ta->flags = TRANSFER_SAVE_ALL;
		958
		959	UNLOCK;
		960	}
		961
		962	static void
		963	prepare_cede (aTHX_ struct transfer_args *ta)
		964	{
		965	LOCK;
		966	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
		967	UNLOCK;
		968
		969	prepare_schedule (ta);
		970	}
		971
		972	static void
		973	api_schedule (void)
		974	{
		975	dTHX;
		976	struct transfer_args ta;
		977
		978	prepare_schedule (&ta);
		979	TRANSFER (ta);
		980	}
		981
		982	static void
		983	api_cede (void)
		984	{
		985	dTHX;
		986	struct transfer_args ta;
		987
		988	prepare_cede (&ta);
		989	TRANSFER (ta);
744	}	990	}
745		991
746	MODULE = Coro::State PACKAGE = Coro::State	992	MODULE = Coro::State PACKAGE = Coro::State
747		993
748	PROTOTYPES: ENABLE	994	PROTOTYPES: DISABLE
749		995
750	BOOT:	996	BOOT:
751	{ /* {} necessary for stoopid perl-5.6.x */	997	{
752	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	998	#ifdef USE_ITHREADS
753	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	999	MUTEX_INIT (&coro_mutex);
		1000	#endif
		1001	BOOT_PAGESIZE;
		1002
754	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1003	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
755		1004
756	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1005	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
757	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1006	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
758	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1007	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
759	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
760
761	if (!padlist_cache)
762	padlist_cache = newHV ();
763		1008
764	main_mainstack = PL_mainstack;	1009	main_mainstack = PL_mainstack;
765	}
766		1010
767	Coro::State	1011	coroapi.ver = CORO_API_VERSION;
768	_newprocess(args)	1012	coroapi.transfer = api_transfer;
769	SV * args	1013
770	PROTOTYPE: $	1014	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1015	}
		1016
		1017	SV *
		1018	new (char *klass, ...)
771	CODE:	1019	CODE:
772	Coro__State coro;	1020	{
		1021	struct coro *coro;
		1022	HV *hv;
		1023	int i;
773		1024
774	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
775	croak ("Coro::State::_newprocess expects an arrayref");
776
777	New (0, coro, 1, struct coro);	1025	Newz (0, coro, 1, struct coro);
		1026	coro->args = newAV ();
778		1027
779	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1028	hv = newHV ();
		1029	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1030	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1031
		1032	for (i = 1; i < items; i++)
		1033	av_push (coro->args, newSVsv (ST (i)));
		1034
780	coro->mainstack = 0; /* actual work is done inside transfer */	1035	/*coro->mainstack = 0; *//*actual work is done inside transfer */
781	coro->stack = 0;	1036	/*coro->stack = 0;*/
782		1037	}
783	RETVAL = coro;
784	OUTPUT:	1038	OUTPUT:
785	RETVAL	1039	RETVAL
786		1040
787	void	1041	void
788	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1042	_set_stacklevel (...)
789	Coro::State_or_hashref prev	1043	ALIAS:
790	Coro::State_or_hashref next	1044	Coro::State::transfer = 1
791	int flags	1045	Coro::schedule = 2
792	PROTOTYPE: @	1046	Coro::cede = 3
		1047	Coro::Cont::yield = 4
793	CODE:	1048	CODE:
794	transfer (aTHX_ prev, next, flags);	1049	{
		1050	struct transfer_args ta;
		1051
		1052	switch (ix)
		1053	{
		1054	case 0:
		1055	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
		1056	ta.next = 0;
		1057	ta.flags = TRANSFER_SET_STACKLEVEL;
		1058	break;
		1059
		1060	case 1:
		1061	if (items != 3)
		1062	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1063
		1064	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1065	break;
		1066
		1067	case 2:
		1068	prepare_schedule (&ta);
		1069	break;
		1070
		1071	case 3:
		1072	prepare_cede (&ta);
		1073	break;
		1074
		1075	case 4:
		1076	{
		1077	SV *yieldstack;
		1078	SV *sv;
		1079	AV *defav = GvAV (PL_defgv);
		1080
		1081	yieldstack = *hv_fetch (
		1082	(HV *)SvRV (GvSV (coro_current)),
		1083	"yieldstack", sizeof ("yieldstack") - 1,
		1084	0
		1085	);
		1086
		1087	/* set up @_ -- ugly */
		1088	av_clear (defav);
		1089	av_fill (defav, items - 1);
		1090	while (items--)
		1091	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1092
		1093	sv = av_pop ((AV *)SvRV (yieldstack));
		1094	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1095	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1096	ta.flags = 0;
		1097	SvREFCNT_dec (sv);
		1098	}
		1099	break;
		1100
		1101	}
		1102
		1103	TRANSFER (ta);
		1104	}
795		1105
796	void	1106	void
797	DESTROY(coro)	1107	_clone_state_from (SV *dst, SV *src)
798	Coro::State coro	1108	CODE:
		1109	{
		1110	struct coro *coro_src = SvSTATE (src);
		1111
		1112	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1113
		1114	++coro_src->refcnt;
		1115	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1116	}
		1117
		1118	void
		1119	_nonlocal_goto (IV nextop)
		1120	CODE:
		1121	/* uuh, somebody will kill me again for this */
		1122	PL_op->op_next = INT2PTR (OP *, nextop);
		1123
		1124	void
		1125	_exit (code)
		1126	int code
		1127	PROTOTYPE: $
		1128	CODE:
		1129	_exit (code);
		1130
		1131	MODULE = Coro::State PACKAGE = Coro
		1132
		1133	BOOT:
		1134	{
		1135	int i;
		1136
		1137	coro_stash = gv_stashpv ("Coro", TRUE);
		1138
		1139	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1140	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1141	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1142	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1143	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1144	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1145
		1146	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1147	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1148
		1149	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1150	coro_ready[i] = newAV ();
		1151
		1152	{
		1153	SV *sv = perl_get_sv("Coro::API", 1);
		1154
		1155	coroapi.schedule = api_schedule;
		1156	coroapi.cede = api_cede;
		1157	coroapi.ready = api_ready;
		1158	coroapi.nready = &coro_nready;
		1159	coroapi.current = coro_current;
		1160
		1161	GCoroAPI = &coroapi;
		1162	sv_setiv (sv, (IV)&coroapi);
		1163	SvREADONLY_on (sv);
		1164	}
		1165	}
		1166
		1167	int
		1168	prio (Coro::State coro, int newprio = 0)
		1169	ALIAS:
		1170	nice = 1
799	CODE:	1171	CODE:
		1172	{
		1173	RETVAL = coro->prio;
800		1174
801	if (coro->mainstack && coro->mainstack != main_mainstack)	1175	if (items > 1)
802	{	1176	{
803	struct coro temp;	1177	if (ix)
		1178	newprio += coro->prio;
804		1179
805	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1180	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
806	LOAD(aTHX_ coro);	1181	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
807		1182
808	destroy_stacks (aTHX);	1183	coro->prio = newprio;
809
810	LOAD((&temp)); /* this will get rid of defsv etc.. */
811
812	coro->mainstack = 0;
813	}	1184	}
814		1185	}
815	deallocate_stack (coro);
816
817	Safefree (coro);
818		1186
819	void	1187	void
820	flush()	1188	ready (SV *self)
		1189	PROTOTYPE: $
821	CODE:	1190	CODE:
822	#ifdef MAY_FLUSH	1191	api_ready (self);
823	flush_padlist_cache ();
824	#endif
825		1192
		1193	int
		1194	nready (...)
		1195	PROTOTYPE:
		1196	CODE:
		1197	RETVAL = coro_nready;
		1198	OUTPUT:
		1199	RETVAL
		1200
826	MODULE = Coro::State PACKAGE = Coro::Cont	1201	MODULE = Coro::State PACKAGE = Coro::AIO
827		1202
828	# this is slightly dirty	1203	SV *
		1204	_get_state ()
		1205	CODE:
		1206	{
		1207	struct {
		1208	int errorno;
		1209	int laststype;
		1210	int laststatval;
		1211	Stat_t statcache;
		1212	} data;
		1213
		1214	data.errorno = errno;
		1215	data.laststype = PL_laststype;
		1216	data.laststatval = PL_laststatval;
		1217	data.statcache = PL_statcache;
		1218
		1219	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1220	}
		1221	OUTPUT:
		1222	RETVAL
829		1223
830	void	1224	void
831	yield(...)	1225	_set_state (char *data_)
832	PROTOTYPE: @	1226	PROTOTYPE: $
833	CODE:	1227	CODE:
834	static SV *returnstk;	1228	{
835	SV *sv;	1229	struct {
836	AV *defav = GvAV (PL_defgv);	1230	int errorno;
837	struct coro *prev, *next;	1231	int laststype;
		1232	int laststatval;
		1233	Stat_t statcache;
		1234	} *data = (void *)data_;
838		1235
839	if (!returnstk)	1236	errno = data->errorno;
840	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1237	PL_laststype = data->laststype;
841		1238	PL_laststatval = data->laststatval;
842	/* set up @_ -- ugly */	1239	PL_statcache = data->statcache;
843	av_clear (defav);	1240	}
844	av_fill (defav, items - 1);
845	while (items--)
846	av_store (defav, items, SvREFCNT_inc (ST(items)));
847
848	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
849	sv = av_pop ((AV *)SvRV (returnstk));
850	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
851	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
852	SvREFCNT_dec (sv);
853
854	transfer(aTHX_ prev, next, 0);
855

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