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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.13 by root, Mon Jul 23 22:09:39 2001 UTC vs.
Revision 1.118 by root, Fri Dec 1 19:58:53 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
		23	# ifndef PL_ppaddr
		24	# define PL_ppaddr ppaddr
		25	# endif
		26	# ifndef call_sv
		27	# define call_sv perl_call_sv
		28	# endif
		29	# ifndef get_sv
		30	# define get_sv perl_get_sv
		31	# endif
		32	# ifndef get_cv
		33	# define get_cv perl_get_cv
		34	# endif
		35	# ifndef IS_PADGV
		36	# define IS_PADGV(v) 0
		37	# endif
		38	# ifndef IS_PADCONST
		39	# define IS_PADCONST(v) 0
		40	# endif
		41	#endif
		42
		43	#include <stdio.h>
		44	#include <errno.h>
		45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
6		53
7	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
8	# include <unistd.h>	55	# include <unistd.h>
9	# include <sys/mman.h>	56	# include <sys/mman.h>
		57	# ifndef MAP_ANONYMOUS
		58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
		60	# else
		61	# undef HAVE_MMAP
		62	# endif
10	#endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
		71	# endif
		72	#else
		73	# define PAGESIZE 0
		74	# define BOOT_PAGESIZE (void)0
		75	#endif
11		76
12	#define MAY_FLUSH /* increases codesize */	77	/* The next macro should declare a variable stacklevel that contains and approximation
		78	* to the current C stack pointer. Its property is that it changes with each call
		79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
		81	#define STACKLEVEL ((void *)&stacklevel)
13		82
14	#define SUB_INIT "Coro::State::initialize"	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
15		84
16	#define TRANSFER_SAVE_DEFAV 0x00000001	85	#if __GNUC__ >= 3
17	#define TRANSFER_SAVE_DEFSV 0x00000002	86	# define attribute(x) __attribute__(x)
18	#define TRANSFER_SAVE_ERRSV 0x00000004	87	#else
19	#define TRANSFER_SAVE_CCTXT 0x00000008	88	# define attribute(x)
		89	#endif
20		90
21	#define TRANSFER_SAVE_ALL -1	91	#define NOINLINE attribute ((noinline))
22		92
		93	#include "CoroAPI.h"
		94
		95	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		96
		97	#ifdef USE_ITHREADS
		98	static perl_mutex coro_mutex;
		99	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		100	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		101	#else
		102	# define LOCK (void)0
		103	# define UNLOCK (void)0
		104	#endif
		105
		106	static struct CoroAPI coroapi;
		107	static AV *main_mainstack; /* used to differentiate between $main and others */
		108	static HV *coro_state_stash, *coro_stash;
		109	static SV *coro_mortal; /* will be freed after next transfer */
		110
		111	static struct coro_cctx *cctx_first;
		112	static int cctx_count, cctx_idle;
		113
		114	/* this is a structure representing a c-level coroutine */
		115	typedef struct coro_cctx {
		116	struct coro_cctx *next;
		117
		118	/* the stack */
		119	void *sptr;
		120	long ssize; /* positive == mmap, otherwise malloc */
		121
		122	/* cpu state */
		123	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		124	JMPENV *top_env;
		125	coro_context cctx;
		126
		127	int inuse;
		128
		129	#if USE_VALGRIND
		130	int valgrind_id;
		131	#endif
		132	} coro_cctx;
		133
		134	enum {
		135	CF_RUNNING = 0x0001, /* coroutine is running */
		136	CF_READY = 0x0002, /* coroutine is ready */
		137	CF_NEW = 0x0004, /* ahs never been switched to */
		138	};
		139
		140	/* this is a structure representing a perl-level coroutine */
23	struct coro {	141	struct coro {
24	/* the optional C context */	142	/* the c coroutine allocated to this perl coroutine, if any */
25	coro_context cctx;	143	coro_cctx *cctx;
26	void *sptr;	144
27	long ssize;	145	/* data associated with this coroutine (initial args) */
		146	AV *args;
		147	int refcnt;
		148	int flags;
28		149
29	/* optionally saved, might be zero */	150	/* optionally saved, might be zero */
30	AV *defav;	151	AV *defav;
31	SV *defsv;	152	SV *defsv;
32	SV *errsv;	153	SV *errsv;
33		154
34	/* saved global state not related to stacks */	155	#define VAR(name,type) type name;
35	U8 dowarn;	156	# include "state.h"
		157	#undef VAR
36		158
37	/* the stacks and related info (callchain etc..) */	159	/* coro process data */
38	PERL_SI *curstackinfo;	160	int prio;
39	AV *curstack;
40	AV *mainstack;
41	SV **stack_sp;
42	OP *op;
43	SV **curpad;
44	SV **stack_base;
45	SV **stack_max;
46	SV **tmps_stack;
47	I32 tmps_floor;
48	I32 tmps_ix;
49	I32 tmps_max;
50	I32 *markstack;
51	I32 *markstack_ptr;
52	I32 *markstack_max;
53	I32 *scopestack;
54	I32 scopestack_ix;
55	I32 scopestack_max;
56	ANY *savestack;
57	I32 savestack_ix;
58	I32 savestack_max;
59	OP **retstack;
60	I32 retstack_ix;
61	I32 retstack_max;
62	COP *curcop;
63	JMPENV start_env;
64	JMPENV *top_env;
65
66	/* data associated with this coroutine (initial args) */
67	AV *args;
68	};	161	};
69		162
70	typedef struct coro *Coro__State;	163	typedef struct coro *Coro__State;
71	typedef struct coro *Coro__State_or_hashref;	164	typedef struct coro *Coro__State_or_hashref;
72		165
73	static AV *main_mainstack; /* used to differentiate between $main and others */	166	static AV *
74	static HV *coro_state_stash;	167	coro_clone_padlist (CV *cv)
75	static HV *padlist_cache;
76
77	/* mostly copied from op.c:cv_clone2 */
78	STATIC AV *
79	clone_padlist (AV *protopadlist)
80	{	168	{
81	AV *av;	169	AV *padlist = CvPADLIST (cv);
82	I32 ix;
83	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
84	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
85	SV **pname = AvARRAY (protopad_name);
86	SV **ppad = AvARRAY (protopad);
87	I32 fname = AvFILLp (protopad_name);
88	I32 fpad = AvFILLp (protopad);
89	AV *newpadlist, *newpad_name, *newpad;	170	AV *newpadlist, *newpad;
90	SV **npad;
91
92	newpad_name = newAV ();
93	for (ix = fname; ix >= 0; ix--)
94	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
95
96	newpad = newAV ();
97	av_fill (newpad, AvFILLp (protopad));
98	npad = AvARRAY (newpad);
99		171
100	newpadlist = newAV ();	172	newpadlist = newAV ();
101	AvREAL_off (newpadlist);	173	AvREAL_off (newpadlist);
102	av_store (newpadlist, 0, (SV *) newpad_name);	174	#if PERL_VERSION_ATLEAST (5,9,0)
		175	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		176	#else
		177	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		178	#endif
		179	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		180	--AvFILLp (padlist);
		181
		182	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
103	av_store (newpadlist, 1, (SV *) newpad);	183	av_store (newpadlist, 1, (SV *)newpad);
104		184
105	av = newAV (); /* will be @_ */	185	return newpadlist;
106	av_extend (av, 0);	186	}
107	av_store (newpad, 0, (SV *) av);
108	AvFLAGS (av) = AVf_REIFY;
109		187
110	for (ix = fpad; ix > 0; ix--)	188	static void
		189	free_padlist (AV *padlist)
		190	{
		191	/* may be during global destruction */
		192	if (SvREFCNT (padlist))
111	{	193	{
112	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	194	I32 i = AvFILLp (padlist);
113	if (namesv && namesv != &PL_sv_undef)	195	while (i >= 0)
114	{	196	{
115	char *name = SvPVX (namesv); /* XXX */	197	SV **svp = av_fetch (padlist, i--, FALSE);
116	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	198	if (svp)
117	{ /* lexical from outside? */
118	npad[ix] = SvREFCNT_inc (ppad[ix]);
119	}	199	{
120	else
121	{ /* our own lexical */
122	SV *sv;	200	SV *sv;
123	if (*name == '&')	201	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
124	sv = SvREFCNT_inc (ppad[ix]);	202	SvREFCNT_dec (sv);
125	else if (*name == '@')	203
126	sv = (SV *) newAV ();	204	SvREFCNT_dec (*svp);
127	else if (*name == '%')
128	sv = (SV *) newHV ();
129	else
130	sv = NEWSV (0, 0);
131	if (!SvPADBUSY (sv))
132	SvPADMY_on (sv);
133	npad[ix] = sv;
134	}	205	}
135	}	206	}
136	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	207
137	{	208	SvREFCNT_dec ((SV*)padlist);
138	npad[ix] = SvREFCNT_inc (ppad[ix]);
139	}
140	else
141	{
142	SV *sv = NEWSV (0, 0);
143	SvPADTMP_on (sv);
144	npad[ix] = sv;
145	}
146	}	209	}
		210	}
147		211
148	#if 0 /* return -ENOTUNDERSTOOD */	212	static int
149	/* Now that vars are all in place, clone nested closures. */	213	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		214	{
		215	AV *padlist;
		216	AV *av = (AV *)mg->mg_obj;
150		217
151	for (ix = fpad; ix > 0; ix--) {	218	/* casting is fun. */
152	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	219	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
153	if (namesv	220	free_padlist (padlist);
154	&& namesv != &PL_sv_undef	221
155	&& !(SvFLAGS(namesv) & SVf_FAKE)	222	SvREFCNT_dec (av);
156	&& *SvPVX(namesv) == '&'	223
157	&& CvCLONE(ppad[ix]))	224	return 0;
158	{	225	}
159	CV *kid = cv_clone((CV*)ppad[ix]);	226
160	SvREFCNT_dec(ppad[ix]);	227	#define PERL_MAGIC_coro PERL_MAGIC_ext
161	CvCLONE_on(kid);	228
162	SvPADMY_on(kid);	229	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
163	npad[ix] = (SV*)kid;	230
164	}	231	#define CORO_MAGIC(cv) \
		232	SvMAGIC (cv) \
		233	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		234	? SvMAGIC (cv) \
		235	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		236	: 0
		237
		238	/* the next two functions merely cache the padlists */
		239	static void
		240	get_padlist (CV *cv)
		241	{
		242	MAGIC *mg = CORO_MAGIC (cv);
		243	AV *av;
		244
		245	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		246	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		247	else
		248	{
		249	#if 0
		250	/* this is probably cleaner, but also slower? */
		251	CV *cp = Perl_cv_clone (cv);
		252	CvPADLIST (cv) = CvPADLIST (cp);
		253	CvPADLIST (cp) = 0;
		254	SvREFCNT_dec (cp);
		255	#else
		256	CvPADLIST (cv) = coro_clone_padlist (cv);
		257	#endif
		258	}
		259	}
		260
		261	static void
		262	put_padlist (CV *cv)
		263	{
		264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
		266
		267	if (!mg)
		268	{
		269	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		270	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		271	mg->mg_virtual = &vtbl_coro;
		272	mg->mg_obj = (SV *)newAV ();
165	}	273	}
166	#endif
167		274
168	return newpadlist;	275	av = (AV *)mg->mg_obj;
169	}
170		276
171	#ifdef MAY_FLUSH	277	if (AvFILLp (av) >= AvMAX (av))
172	STATIC AV *	278	av_extend (av, AvMAX (av) + 1);
173	free_padlist (AV *padlist)
174	{
175	/* may be during global destruction */
176	if (SvREFCNT(padlist))
177	{
178	I32 i = AvFILLp(padlist);
179	while (i >= 0)
180	{
181	SV **svp = av_fetch(padlist, i--, FALSE);
182	SV *sv = svp ? *svp : Nullsv;
183	if (sv)
184	SvREFCNT_dec(sv);
185	}
186		279
187	SvREFCNT_dec((SV*)padlist);	280	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
188	}
189	}	281	}
190	#endif
191
192	/* the next two functions merely cache the padlists */
193	STATIC void
194	get_padlist (CV *cv)
195	{
196	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
197
198	if (he && AvFILLp ((AV *)*he) >= 0)
199	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
200	else
201	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
202	}
203
204	STATIC void
205	put_padlist (CV *cv)
206	{
207	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
208
209	if (SvTYPE (*he) != SVt_PVAV)
210	{
211	SvREFCNT_dec (*he);
212	*he = (SV *)newAV ();
213	}
214
215	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
216	}
217
218	#ifdef MAY_FLUSH
219	STATIC void
220	flush_padlist_cache ()
221	{
222	HV *hv = padlist_cache;
223	padlist_cache = newHV ();
224
225	if (hv_iterinit (hv))
226	{
227	HE *he;
228	AV *padlist;
229
230	while (!!(he = hv_iternext (hv)))
231	{
232	AV *av = (AV *)HeVAL(he);
233
234	/* casting is fun. */
235	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
236	free_padlist (padlist);
237	}
238	}
239
240	SvREFCNT_dec (hv);
241	}
242	#endif
243		282
244	#define SB do {	283	#define SB do {
245	#define SE } while (0)	284	#define SE } while (0)
246		285
247	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	286	#define LOAD(state) load_state ((state))
248	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	287	#define SAVE(state,flags) save_state ((state),(flags))
249		288
250	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
251		290
252	static void	291	static void
253	load_state(pTHX_ Coro__State c)	292	load_state (Coro__State c)
254	{	293	{
255	PL_dowarn = c->dowarn;	294	#define VAR(name,type) PL_ ## name = c->name;
256		295	# include "state.h"
257	PL_curstackinfo = c->curstackinfo;	296	#undef VAR
258	PL_curstack = c->curstack;
259	PL_mainstack = c->mainstack;
260	PL_stack_sp = c->stack_sp;
261	PL_op = c->op;
262	PL_curpad = c->curpad;
263	PL_stack_base = c->stack_base;
264	PL_stack_max = c->stack_max;
265	PL_tmps_stack = c->tmps_stack;
266	PL_tmps_floor = c->tmps_floor;
267	PL_tmps_ix = c->tmps_ix;
268	PL_tmps_max = c->tmps_max;
269	PL_markstack = c->markstack;
270	PL_markstack_ptr = c->markstack_ptr;
271	PL_markstack_max = c->markstack_max;
272	PL_scopestack = c->scopestack;
273	PL_scopestack_ix = c->scopestack_ix;
274	PL_scopestack_max = c->scopestack_max;
275	PL_savestack = c->savestack;
276	PL_savestack_ix = c->savestack_ix;
277	PL_savestack_max = c->savestack_max;
278	PL_retstack = c->retstack;
279	PL_retstack_ix = c->retstack_ix;
280	PL_retstack_max = c->retstack_max;
281	PL_curcop = c->curcop;
282	PL_start_env = c->start_env;
283	PL_top_env = c->top_env;
284		297
285	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	298	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
286	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	299	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
287	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	300	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
288		301
…		…
291	CV *cv;	304	CV *cv;
292		305
293	/* now do the ugly restore mess */	306	/* now do the ugly restore mess */
294	while ((cv = (CV *)POPs))	307	while ((cv = (CV *)POPs))
295	{	308	{
296	AV *padlist = (AV *)POPs;
297
298	if (padlist)
299	{
300	put_padlist (cv); /* mark this padlist as available */	309	put_padlist (cv); /* mark this padlist as available */
301	CvPADLIST(cv) = padlist;	310	CvDEPTH (cv) = PTR2IV (POPs);
302	#ifdef USE_THREADS	311	CvPADLIST (cv) = (AV *)POPs;
303	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
304	#endif
305	}
306
307	++CvDEPTH(cv);
308	}	312	}
309		313
310	PUTBACK;	314	PUTBACK;
311	}	315	}
312	}	316	}
313		317
314	static void	318	static void
315	save_state(pTHX_ Coro__State c, int flags)	319	save_state (Coro__State c, int flags)
316	{	320	{
317	{	321	{
318	dSP;	322	dSP;
319	I32 cxix = cxstack_ix;	323	I32 cxix = cxstack_ix;
320	PERL_CONTEXT *ccstk = cxstack;	324	PERL_CONTEXT *ccstk = cxstack;
…		…
327		331
328	PUSHs (Nullsv);	332	PUSHs (Nullsv);
329	/* this loop was inspired by pp_caller */	333	/* this loop was inspired by pp_caller */
330	for (;;)	334	for (;;)
331	{	335	{
332	do	336	while (cxix >= 0)
333	{	337	{
334	PERL_CONTEXT *cx = &ccstk[cxix--];	338	PERL_CONTEXT *cx = &ccstk[cxix--];
335		339
336	if (CxTYPE(cx) == CXt_SUB)	340	if (CxTYPE (cx) == CXt_SUB)
337	{	341	{
338	CV *cv = cx->blk_sub.cv;	342	CV *cv = cx->blk_sub.cv;
		343
339	if (CvDEPTH(cv))	344	if (CvDEPTH (cv))
340	{	345	{
341	#ifdef USE_THREADS
342	/*XPUSHs ((SV *)CvOWNER(cv));*/
343	/*CvOWNER(cv) = 0;*/
344	/*error must unlock this cv etc.. etc...*/
345	#endif
346	EXTEND (SP, CvDEPTH(cv)*2);	346	EXTEND (SP, 3);
347		347
348	while (--CvDEPTH(cv))
349	{
350	/* this tells the restore code to increment CvDEPTH */
351	PUSHs (Nullsv);
352	PUSHs ((SV *)cv);
353	}
354
355	PUSHs ((SV *)CvPADLIST(cv));	348	PUSHs ((SV *)CvPADLIST (cv));
		349	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
356	PUSHs ((SV *)cv);	350	PUSHs ((SV *)cv);
357		351
		352	CvDEPTH (cv) = 0;
358	get_padlist (cv); /* this is a monster */	353	get_padlist (cv);
359	}	354	}
360	}	355	}
		356	#ifdef CXt_FORMAT
361	else if (CxTYPE(cx) == CXt_FORMAT)	357	else if (CxTYPE (cx) == CXt_FORMAT)
362	{	358	{
363	/* I never used formats, so how should I know how these are implemented? */	359	/* I never used formats, so how should I know how these are implemented? */
364	/* my bold guess is as a simple, plain sub... */	360	/* my bold guess is as a simple, plain sub... */
365	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	361	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
366	}	362	}
		363	#endif
367	}	364	}
368	while (cxix >= 0);
369		365
370	if (top_si->si_type == PERLSI_MAIN)	366	if (top_si->si_type == PERLSI_MAIN)
371	break;	367	break;
372		368
373	top_si = top_si->si_prev;	369	top_si = top_si->si_prev;
…		…
380		376
381	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	377	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
382	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	378	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
383	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	379	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
384		380
385	/* I have not the slightest idea of why av_reify is necessary */	381	#define VAR(name,type)c->name = PL_ ## name;
386	/* but if it's missing the defav contents magically get replaced sometimes */	382	# include "state.h"
387	if (c->defav)	383	#undef VAR
388	av_reify (c->defav);
389
390	c->dowarn = PL_dowarn;
391
392	c->curstackinfo = PL_curstackinfo;
393	c->curstack = PL_curstack;
394	c->mainstack = PL_mainstack;
395	c->stack_sp = PL_stack_sp;
396	c->op = PL_op;
397	c->curpad = PL_curpad;
398	c->stack_base = PL_stack_base;
399	c->stack_max = PL_stack_max;
400	c->tmps_stack = PL_tmps_stack;
401	c->tmps_floor = PL_tmps_floor;
402	c->tmps_ix = PL_tmps_ix;
403	c->tmps_max = PL_tmps_max;
404	c->markstack = PL_markstack;
405	c->markstack_ptr = PL_markstack_ptr;
406	c->markstack_max = PL_markstack_max;
407	c->scopestack = PL_scopestack;
408	c->scopestack_ix = PL_scopestack_ix;
409	c->scopestack_max = PL_scopestack_max;
410	c->savestack = PL_savestack;
411	c->savestack_ix = PL_savestack_ix;
412	c->savestack_max = PL_savestack_max;
413	c->retstack = PL_retstack;
414	c->retstack_ix = PL_retstack_ix;
415	c->retstack_max = PL_retstack_max;
416	c->curcop = PL_curcop;
417	c->start_env = PL_start_env;
418	c->top_env = PL_top_env;
419	}	384	}
420		385
421	/*	386	/*
422	* allocate various perl stacks. This is an exact copy	387	* allocate various perl stacks. This is an exact copy
423	* of perl.c:init_stacks, except that it uses less memory	388	* of perl.c:init_stacks, except that it uses less memory
424	* on the assumption that coroutines do not usually need	389	* on the (sometimes correct) assumption that coroutines do
425	* a lot of stackspace.	390	* not usually need a lot of stackspace.
426	*/	391	*/
427	STATIC void	392	static void
428	coro_init_stacks (pTHX)	393	coro_init_stacks ()
429	{	394	{
430	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	395	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
431	PL_curstackinfo->si_type = PERLSI_MAIN;	396	PL_curstackinfo->si_type = PERLSI_MAIN;
432	PL_curstack = PL_curstackinfo->si_stack;	397	PL_curstack = PL_curstackinfo->si_stack;
433	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	398	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
434		399
435	PL_stack_base = AvARRAY(PL_curstack);	400	PL_stack_base = AvARRAY(PL_curstack);
436	PL_stack_sp = PL_stack_base;	401	PL_stack_sp = PL_stack_base;
437	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	402	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
438		403
439	New(50,PL_tmps_stack,64,SV*);	404	New(50,PL_tmps_stack,128,SV*);
440	PL_tmps_floor = -1;	405	PL_tmps_floor = -1;
441	PL_tmps_ix = -1;	406	PL_tmps_ix = -1;
442	PL_tmps_max = 64;	407	PL_tmps_max = 128;
443		408
444	New(54,PL_markstack,12,I32);	409	New(54,PL_markstack,32,I32);
445	PL_markstack_ptr = PL_markstack;	410	PL_markstack_ptr = PL_markstack;
446	PL_markstack_max = PL_markstack + 12;	411	PL_markstack_max = PL_markstack + 32;
447		412
		413	#ifdef SET_MARK_OFFSET
448	SET_MARK_OFFSET;	414	SET_MARK_OFFSET;
		415	#endif
449		416
450	New(54,PL_scopestack,12,I32);	417	New(54,PL_scopestack,32,I32);
451	PL_scopestack_ix = 0;	418	PL_scopestack_ix = 0;
452	PL_scopestack_max = 12;	419	PL_scopestack_max = 32;
453		420
454	New(54,PL_savestack,64,ANY);	421	New(54,PL_savestack,64,ANY);
455	PL_savestack_ix = 0;	422	PL_savestack_ix = 0;
456	PL_savestack_max = 64;	423	PL_savestack_max = 64;
457		424
		425	#if !PERL_VERSION_ATLEAST (5,9,0)
458	New(54,PL_retstack,8,OP*);	426	New(54,PL_retstack,16,OP*);
459	PL_retstack_ix = 0;	427	PL_retstack_ix = 0;
460	PL_retstack_max = 8;	428	PL_retstack_max = 16;
		429	#endif
461	}	430	}
462		431
463	/*	432	/*
464	* destroy the stacks, the callchain etc...	433	* destroy the stacks, the callchain etc...
465	* still there is a memleak of 128 bytes...
466	*/	434	*/
467	STATIC void	435	static void
468	destroy_stacks(pTHX)	436	coro_destroy_stacks ()
469	{	437	{
		438	if (!IN_DESTRUCT)
		439	{
470	/* is this ugly, I ask? */	440	/* is this ugly, I ask? */
471	while (PL_scopestack_ix)	441	LEAVE_SCOPE (0);
472	LEAVE;
473		442
474	/* sure it is, but more important: is it correct?? :/ */	443	/* sure it is, but more important: is it correct?? :/ */
475	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
476	FREETMPS;	444	FREETMPS;
		445
		446	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		447	}
477		448
478	while (PL_curstackinfo->si_next)	449	while (PL_curstackinfo->si_next)
479	PL_curstackinfo = PL_curstackinfo->si_next;	450	PL_curstackinfo = PL_curstackinfo->si_next;
480		451
481	while (PL_curstackinfo)	452	while (PL_curstackinfo)
482	{	453	{
483	PERL_SI *p = PL_curstackinfo->si_prev;	454	PERL_SI *p = PL_curstackinfo->si_prev;
484		455
485	{	456	{ /*D*//*remove*/
486	dSP;	457	dSP;
487	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	458	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
488	PUTBACK; /* possibly superfluous */	459	PUTBACK; /* possibly superfluous */
489	}	460	}
490		461
491	dounwind(-1);	462	if (!IN_DESTRUCT)
492		463	{
		464	dounwind (-1);/*D*//*remove*/
493	SvREFCNT_dec(PL_curstackinfo->si_stack);	465	SvREFCNT_dec (PL_curstackinfo->si_stack);
		466	}
		467
494	Safefree(PL_curstackinfo->si_cxstack);	468	Safefree (PL_curstackinfo->si_cxstack);
495	Safefree(PL_curstackinfo);	469	Safefree (PL_curstackinfo);
496	PL_curstackinfo = p;	470	PL_curstackinfo = p;
497	}	471	}
498		472
499	Safefree(PL_tmps_stack);	473	Safefree (PL_tmps_stack);
500	Safefree(PL_markstack);	474	Safefree (PL_markstack);
501	Safefree(PL_scopestack);	475	Safefree (PL_scopestack);
502	Safefree(PL_savestack);	476	Safefree (PL_savestack);
		477	#if !PERL_VERSION_ATLEAST (5,9,0)
503	Safefree(PL_retstack);	478	Safefree (PL_retstack);
504	}
505
506	static void
507	allocate_stack (Coro__State ctx)
508	{
509	#ifdef HAVE_MMAP
510	ctx->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
511	ctx->sptr = mmap (0, ctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
512	if (ctx->sptr == (void *)-1)
513	#endif	479	#endif
514	{
515	/*FIXME*//*D*//* reasonable stack size! */
516	ctx->ssize = 4096 * sizeof (long);
517	New (0, ctx->sptr, 4096, long);
518	}
519	}	480	}
520		481
521	static void	482	static void
522	deallocate_stack (Coro__State ctx)	483	setup_coro (struct coro *coro)
523	{
524	#ifdef HAVE_MMAP
525	munmap (ctx->sptr, ctx->ssize);
526	#else
527	Safefree (ctx->sptr);
528	#endif
529	}
530
531	/* might go away together with optional SAVE_CCTXT */
532	static void
533	setup_coro (void *arg)
534	{	484	{
535	/*	485	/*
536	* emulate part of the perl startup here.	486	* emulate part of the perl startup here.
537	*/	487	*/
		488
		489	coro_init_stacks ();
		490
		491	PL_curcop = &PL_compiling;
		492	PL_in_eval = EVAL_NULL;
		493	PL_curpm = 0;
		494	PL_localizing = 0;
		495	PL_dirty = 0;
		496	PL_restartop = 0;
		497
		498	{
		499	dSP;
		500	LOGOP myop;
		501
		502	/* I have no idea why this is needed, but it is */
		503	PUSHMARK (SP);
		504
		505	SvREFCNT_dec (GvAV (PL_defgv));
		506	GvAV (PL_defgv) = coro->args; coro->args = 0;
		507
		508	Zero (&myop, 1, LOGOP);
		509	myop.op_next = Nullop;
		510	myop.op_flags = OPf_WANT_VOID;
		511
		512	PL_op = (OP *)&myop;
		513
		514	PUSHMARK (SP);
		515	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		516	PUTBACK;
		517	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		518	SPAGAIN;
		519	}
		520
		521	ENTER; /* necessary e.g. for dounwind */
		522	}
		523
		524	static void
		525	free_coro_mortal ()
		526	{
		527	if (coro_mortal)
		528	{
		529	SvREFCNT_dec (coro_mortal);
		530	coro_mortal = 0;
		531	}
		532	}
		533
		534	static void NOINLINE
		535	prepare_cctx (coro_cctx *cctx)
		536	{
538	dSP;	537	dSP;
539	Coro__State ctx = (Coro__State)arg;	538	LOGOP myop;
540	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
541		539
542	coro_init_stacks (aTHX);	540	Zero (&myop, 1, LOGOP);
543	JMPENV_BOOTSTRAP;	541	myop.op_next = PL_op;
		542	myop.op_flags = OPf_WANT_VOID;
		543
		544	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		545
		546	PUSHMARK (SP);
		547	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		548	PUTBACK;
		549	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
544	SPAGAIN;	550	SPAGAIN;
		551	}
545		552
546	/*PL_curcop = 0;*/	553	static void
547	SvREFCNT_dec (GvAV (PL_defgv));	554	coro_run (void *arg)
548	GvAV (PL_defgv) = ctx->args;	555	{
		556	/* coro_run is the alternative epilogue of transfer() */
		557	UNLOCK;
549		558
550	if (ctx->sptr)	559	/*
		560	* this is a _very_ stripped down perl interpreter ;)
		561	*/
		562	PL_top_env = &PL_start_env;
		563
		564	/* inject call to cctx_init */
		565	prepare_cctx ((coro_cctx *)arg);
		566
		567	/* somebody will hit me for both perl_run and PL_restartop */
		568	perl_run (PL_curinterp);
		569
		570	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		571	abort ();
		572	}
		573
		574	static coro_cctx *
		575	cctx_new ()
		576	{
		577	coro_cctx *cctx;
		578
		579	++cctx_count;
		580
		581	New (0, cctx, 1, coro_cctx);
		582
		583	#if HAVE_MMAP
		584
		585	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		586	/* mmap suppsedly does allocate-on-write for us */
		587	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		588
		589	if (cctx->sptr == (void *)-1)
551	{	590	{
552	PUSHMARK(SP);	591	perror ("FATAL: unable to mmap stack for coroutine");
553	PUTBACK;	592	_exit (EXIT_FAILURE);
554	(void) call_sv (sub_init, G_VOID|G_NOARGS);	593	}
555	croak ("FATAL: CCTXT coroutine returned!");	594
		595	# if STACKGUARD
		596	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		597	# endif
		598
		599	#else
		600
		601	cctx->ssize = STACKSIZE * (long)sizeof (long);
		602	New (0, cctx->sptr, STACKSIZE, long);
		603
		604	if (!cctx->sptr)
		605	{
		606	perror ("FATAL: unable to malloc stack for coroutine");
		607	_exit (EXIT_FAILURE);
		608	}
		609
		610	#endif
		611
		612	#if USE_VALGRIND
		613	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		614	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		615	cctx->ssize + (char *)cctx->sptr
		616	);
		617	#endif
		618
		619	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		620
		621	return cctx;
		622	}
		623
		624	static void
		625	cctx_destroy (coro_cctx *cctx)
		626	{
		627	if (!cctx)
		628	return;
		629
		630	--cctx_count;
		631
		632	#if USE_VALGRIND
		633	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		634	#endif
		635
		636	#if HAVE_MMAP
		637	munmap (cctx->sptr, cctx->ssize);
		638	#else
		639	Safefree (cctx->sptr);
		640	#endif
		641
		642	Safefree (cctx);
		643	}
		644
		645	static coro_cctx *
		646	cctx_get ()
		647	{
		648	coro_cctx *cctx;
		649
		650	if (cctx_first)
		651	{
		652	cctx = cctx_first;
		653	cctx_first = cctx->next;
		654	--cctx_idle;
556	}	655	}
557	else	656	else
		657	{
		658	cctx = cctx_new ();
		659	PL_op = PL_op->op_next;
		660	}
		661
		662	return cctx;
		663	}
		664
		665	static void
		666	cctx_put (coro_cctx *cctx)
		667	{
		668	/* free another cctx if overlimit */
		669	if (cctx_idle >= MAX_IDLE_CCTX)
558	{	670	{
559	UNOP myop;	671	coro_cctx *first = cctx_first;
		672	cctx_first = first->next;
		673	--cctx_idle;
560		674
561	PL_op = (OP *)&myop;	675	assert (!first->inuse);
562		676	cctx_destroy (first);
563	Zero(&myop, 1, UNOP);
564	myop.op_next = Nullop;
565	myop.op_flags = OPf_WANT_VOID;
566
567	PUSHMARK(SP);
568	XPUSHs (sub_init);
569	/*
570	* the next line is slightly wrong, as PL_op->op_next
571	* is actually being executed so we skip the first op.
572	* that doesn't matter, though, since it is only
573	* pp_nextstate and we never return...
574	* ah yes, and I don't care anyways ;)
575	*/
576	PUTBACK;
577	PL_op = pp_entersub();
578	SPAGAIN;
579
580	ENTER; /* necessary e.g. for dounwind */
581	}	677	}
582	}
583		678
584	STATIC void	679	++cctx_idle;
		680	cctx->next = cctx_first;
		681	cctx_first = cctx;
		682	}
		683
		684	/* never call directly, always through the coro_state_transfer global variable */
		685	static void NOINLINE
585	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	686	transfer (struct coro *prev, struct coro *next, int flags)
586	{	687	{
587	dSP;	688	dSTACKLEVEL;
588		689
		690	/* sometimes transfer is only called to set idle_sp */
		691	if (flags == TRANSFER_SET_STACKLEVEL)
		692	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
589	if (prev != next)	693	else if (prev != next)
590	{	694	{
591	/*	695	coro_cctx *prev__cctx;
592	* this could be done in newprocess which would lead to	696
593	* extremely elegant and fast (basically just SAVE/LOAD)	697	if (prev->flags & CF_NEW)
594	* code here, but lazy allocation of stacks has also
595	* some virtues and the overhead of the if() is nil.
596	*/
597	if (next->mainstack)
598	{	698	{
		699	/* create a new empty context */
		700	Newz (0, prev->cctx, 1, coro_cctx);
		701	prev->cctx->inuse = 1;
		702	prev->flags &= ~CF_NEW;
		703	prev->flags |= CF_RUNNING;
		704	}
		705
		706	/*TODO: must not croak here */
		707	if (!prev->flags & CF_RUNNING)
		708	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		709
		710	if (next->flags & CF_RUNNING)
		711	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		712
		713	prev->flags &= ~CF_RUNNING;
		714	next->flags |= CF_RUNNING;
		715
		716	LOCK;
		717
		718	if (next->flags & CF_NEW)
		719	{
		720	/* need to start coroutine */
		721	next->flags &= ~CF_NEW;
		722	/* first get rid of the old state */
		723	SAVE (prev, -1);
		724	/* setup coroutine call */
		725	setup_coro (next);
		726	/* need a new stack */
		727	assert (!next->stack);
		728	}
		729	else
		730	{
		731	/* coroutine already started */
599	SAVE (prev, flags);	732	SAVE (prev, flags);
600	LOAD (next);	733	LOAD (next);
601
602	/* mark this state as in-use */
603	next->mainstack = 0;
604	next->tmps_ix = -2;
605
606	if (flags & TRANSFER_SAVE_CCTXT)
607	{
608	if (!next->ssize)
609	croak ("destination coroutine has no CCTXT (%p, %d)", next->sptr, next->ssize);
610
611	if (!prev->ssize)
612	prev->ssize = 1; /* mark cctx as valid ;) */
613
614	coro_transfer (&(prev->cctx), &(next->cctx));
615	}
616
617	}	734	}
618	else if (next->tmps_ix == -2)	735
619	croak ("tried to transfer to running coroutine");	736	prev__cctx = prev->cctx;
620	else	737
		738	/* possibly "free" the cctx */
		739	if (prev__cctx->idle_sp == STACKLEVEL && 0)
621	{	740	{
622	SAVE (prev, -1); /* first get rid of the old state */	741	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		742	assert (PL_top_env == prev__cctx->top_env);
623		743
624	if (flags & TRANSFER_SAVE_CCTXT)	744	prev->cctx = 0;
625	{
626	if (!next->ssize)
627	{
628	allocate_stack (next);
629	coro_create (&(next->cctx),
630	setup_coro, (void *)next,
631	next->sptr, next->ssize);
632	}
633		745
634	if (!prev->ssize)	746	cctx_put (prev__cctx);
635	prev->ssize = 1; /* mark cctx as valid ;) */	747	prev__cctx->inuse = 0;
636
637	coro_transfer (&(prev->cctx), &(next->cctx));
638	}
639	else
640	setup_coro (next);
641	}	748	}
		749
		750	if (!next->cctx)
		751	{
		752	next->cctx = cctx_get ();
		753	assert (!next->cctx->inuse);
		754	next->cctx->inuse = 1;
		755	}
		756
		757	if (prev__cctx != next->cctx)
		758	{
		759	prev__cctx->top_env = PL_top_env;
		760	PL_top_env = next->cctx->top_env;
		761	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		762	}
		763
		764	free_coro_mortal ();
		765
		766	UNLOCK;
642	}	767	}
643	}	768	}
644		769
		770	struct transfer_args
		771	{
		772	struct coro *prev, *next;
		773	int flags;
		774	};
		775
		776	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		777
		778	static void
		779	coro_state_destroy (struct coro *coro)
		780	{
		781	if (coro->refcnt--)
		782	return;
		783
		784	if (coro->mainstack && coro->mainstack != main_mainstack)
		785	{
		786	struct coro temp;
		787
		788	if (coro->flags & CF_RUNNING)
		789	croak ("FATAL: tried to destroy currently running coroutine");
		790
		791	SAVE ((&temp), TRANSFER_SAVE_ALL);
		792	LOAD (coro);
		793
		794	coro_destroy_stacks ();
		795
		796	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		797
		798	coro->mainstack = 0;
		799	}
		800
		801	cctx_destroy (coro->cctx);
		802	SvREFCNT_dec (coro->args);
		803	Safefree (coro);
		804	}
		805
		806	static int
		807	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		808	{
		809	struct coro *coro = (struct coro *)mg->mg_ptr;
		810	mg->mg_ptr = 0;
		811
		812	coro_state_destroy (coro);
		813
		814	return 0;
		815	}
		816
		817	static int
		818	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		819	{
		820	struct coro *coro = (struct coro *)mg->mg_ptr;
		821
		822	++coro->refcnt;
		823
		824	return 0;
		825	}
		826
		827	static MGVTBL coro_state_vtbl = {
		828	0, 0, 0, 0,
		829	coro_state_clear,
		830	0,
		831	#ifdef MGf_DUP
		832	coro_state_dup,
		833	#else
		834	# define MGf_DUP 0
		835	#endif
		836	};
		837
		838	static struct coro *
		839	SvSTATE (SV *coro)
		840	{
		841	HV *stash;
		842	MAGIC *mg;
		843
		844	if (SvROK (coro))
		845	coro = SvRV (coro);
		846
		847	stash = SvSTASH (coro);
		848	if (stash != coro_stash && stash != coro_state_stash)
		849	{
		850	/* very slow, but rare, check */
		851	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		852	croak ("Coro::State object required");
		853	}
		854
		855	mg = SvMAGIC (coro);
		856	assert (mg->mg_type == PERL_MAGIC_ext);
		857	return (struct coro *)mg->mg_ptr;
		858	}
		859
		860	static void
		861	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		862	{
		863	ta->prev = SvSTATE (prev);
		864	ta->next = SvSTATE (next);
		865	ta->flags = flags;
		866	}
		867
		868	static void
		869	api_transfer (SV *prev, SV *next, int flags)
		870	{
		871	struct transfer_args ta;
		872
		873	prepare_transfer (&ta, prev, next, flags);
		874	TRANSFER (ta);
		875	}
		876
		877	/** Coro ********************************************************************/
		878
		879	#define PRIO_MAX 3
		880	#define PRIO_HIGH 1
		881	#define PRIO_NORMAL 0
		882	#define PRIO_LOW -1
		883	#define PRIO_IDLE -3
		884	#define PRIO_MIN -4
		885
		886	/* for Coro.pm */
		887	static SV *coro_current;
		888	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		889	static int coro_nready;
		890
		891	static void
		892	coro_enq (SV *coro_sv)
		893	{
		894	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		895	coro_nready++;
		896	}
		897
		898	static SV *
		899	coro_deq (int min_prio)
		900	{
		901	int prio = PRIO_MAX - PRIO_MIN;
		902
		903	min_prio -= PRIO_MIN;
		904	if (min_prio < 0)
		905	min_prio = 0;
		906
		907	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		908	if (AvFILLp (coro_ready [prio]) >= 0)
		909	{
		910	coro_nready--;
		911	return av_shift (coro_ready [prio]);
		912	}
		913
		914	return 0;
		915	}
		916
		917	static int
		918	api_ready (SV *coro_sv)
		919	{
		920	struct coro *coro;
		921
		922	if (SvROK (coro_sv))
		923	coro_sv = SvRV (coro_sv);
		924
		925	coro = SvSTATE (coro_sv);
		926
		927	if (coro->flags & CF_READY)
		928	return 0;
		929
		930	#if 0 /* this is actually harmless */
		931	if (coro->flags & CF_RUNNING)
		932	croak ("Coro::ready called on currently running coroutine");
		933	#endif
		934
		935	coro->flags |= CF_READY;
		936
		937	LOCK;
		938	coro_enq (SvREFCNT_inc (coro_sv));
		939	UNLOCK;
		940
		941	return 1;
		942	}
		943
		944	static int
		945	api_is_ready (SV *coro_sv)
		946	{
		947	return !!SvSTATE (coro_sv)->flags & CF_READY;
		948	}
		949
		950	static void
		951	prepare_schedule (struct transfer_args *ta)
		952	{
		953	SV *prev, *next;
		954
		955	for (;;)
		956	{
		957	LOCK;
		958	next = coro_deq (PRIO_MIN);
		959	UNLOCK;
		960
		961	if (next)
		962	break;
		963
		964	{
		965	dSP;
		966
		967	ENTER;
		968	SAVETMPS;
		969
		970	PUSHMARK (SP);
		971	PUTBACK;
		972	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		973
		974	FREETMPS;
		975	LEAVE;
		976	}
		977	}
		978
		979	prev = SvRV (coro_current);
		980	SvRV_set (coro_current, next);
		981
		982	/* free this only after the transfer */
		983	LOCK;
		984	free_coro_mortal ();
		985	UNLOCK;
		986	coro_mortal = prev;
		987
		988	assert (!SvROK(prev));//D
		989	assert (!SvROK(next));//D
		990
		991	ta->prev = SvSTATE (prev);
		992	ta->next = SvSTATE (next);
		993	ta->flags = TRANSFER_SAVE_ALL;
		994
		995	assert (ta->flags & CF_READY);
		996	ta->next->flags &= ~CF_READY;
		997	}
		998
		999	static void
		1000	prepare_cede (struct transfer_args *ta)
		1001	{
		1002	api_ready (coro_current);
		1003
		1004	prepare_schedule (ta);
		1005	}
		1006
		1007	static void
		1008	api_schedule (void)
		1009	{
		1010	struct transfer_args ta;
		1011
		1012	prepare_schedule (&ta);
		1013	TRANSFER (ta);
		1014	}
		1015
		1016	static void
		1017	api_cede (void)
		1018	{
		1019	struct transfer_args ta;
		1020
		1021	prepare_cede (&ta);
		1022	TRANSFER (ta);
		1023	}
		1024
645	MODULE = Coro::State PACKAGE = Coro::State	1025	MODULE = Coro::State PACKAGE = Coro::State
646		1026
647	PROTOTYPES: ENABLE	1027	PROTOTYPES: DISABLE
648		1028
649	BOOT:	1029	BOOT:
650	{ /* {} necessary for stoopid perl-5.6.x */	1030	{
		1031	#ifdef USE_ITHREADS
		1032	MUTEX_INIT (&coro_mutex);
		1033	#endif
		1034	BOOT_PAGESIZE;
		1035
651	coro_state_stash = gv_stashpvn ("Coro::State", 10, TRUE);	1036	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
652		1037
653	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1038	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
654	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1039	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
655	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1040	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
656	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
657
658	if (!padlist_cache)
659	padlist_cache = newHV ();
660		1041
661	main_mainstack = PL_mainstack;	1042	main_mainstack = PL_mainstack;
662	}
663		1043
664	Coro::State	1044	coroapi.ver = CORO_API_VERSION;
665	_newprocess(args)	1045	coroapi.transfer = api_transfer;
666	SV * args	1046
667	PROTOTYPE: $	1047	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1048	}
		1049
		1050	SV *
		1051	new (char *klass, ...)
668	CODE:	1052	CODE:
669	Coro__State coro;	1053	{
		1054	struct coro *coro;
		1055	HV *hv;
		1056	int i;
670		1057
671	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
672	croak ("Coro::State::_newprocess expects an arrayref");
673
674	New (0, coro, 1, struct coro);	1058	Newz (0, coro, 1, struct coro);
		1059	coro->args = newAV ();
		1060	coro->flags = CF_NEW;
675		1061
676	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1062	hv = newHV ();
677	coro->mainstack = 0; /* actual work is done inside transfer */	1063	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
678	coro->sptr = 0;	1064	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
679	coro->ssize = 0;
680		1065
681	RETVAL = coro;	1066	for (i = 1; i < items; i++)
		1067	av_push (coro->args, newSVsv (ST (i)));
		1068	}
682	OUTPUT:	1069	OUTPUT:
683	RETVAL	1070	RETVAL
684		1071
685	void	1072	void
686	transfer(prev, next, flags = TRANSFER_SAVE_ALL)	1073	_set_stacklevel (...)
687	Coro::State_or_hashref prev	1074	ALIAS:
688	Coro::State_or_hashref next	1075	Coro::State::transfer = 1
689	int flags	1076	Coro::schedule = 2
690	PROTOTYPE: @	1077	Coro::cede = 3
691	CODE:	1078	CODE:
692	transfer (aTHX_ prev, next, flags);	1079	{
		1080	struct transfer_args ta;
		1081
		1082	switch (ix)
		1083	{
		1084	case 0:
		1085	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1086	ta.next = 0;
		1087	ta.flags = TRANSFER_SET_STACKLEVEL;
		1088	break;
		1089
		1090	case 1:
		1091	if (items != 3)
		1092	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1093
		1094	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1095	break;
		1096
		1097	case 2:
		1098	prepare_schedule (&ta);
		1099	break;
		1100
		1101	case 3:
		1102	prepare_cede (&ta);
		1103	break;
		1104	}
		1105
		1106	TRANSFER (ta);
		1107	}
693		1108
694	void	1109	void
695	DESTROY(coro)	1110	_clone_state_from (SV *dst, SV *src)
696	Coro::State coro	1111	CODE:
		1112	{
		1113	struct coro *coro_src = SvSTATE (src);
		1114
		1115	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1116
		1117	++coro_src->refcnt;
		1118	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1119	}
		1120
		1121	void
		1122	_exit (code)
		1123	int code
		1124	PROTOTYPE: $
		1125	CODE:
		1126	_exit (code);
		1127
		1128	int
		1129	cctx_count ()
		1130	CODE:
		1131	RETVAL = cctx_count;
		1132	OUTPUT:
		1133	RETVAL
		1134
		1135	int
		1136	cctx_idle ()
		1137	CODE:
		1138	RETVAL = cctx_idle;
		1139	OUTPUT:
		1140	RETVAL
		1141
		1142	MODULE = Coro::State PACKAGE = Coro
		1143
		1144	BOOT:
		1145	{
		1146	int i;
		1147
		1148	coro_stash = gv_stashpv ("Coro", TRUE);
		1149
		1150	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1151	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1152	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1153	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1154	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1155	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1156
		1157	coro_current = get_sv ("Coro::current", FALSE);
		1158	SvREADONLY_on (coro_current);
		1159
		1160	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1161	coro_ready[i] = newAV ();
		1162
		1163	{
		1164	SV *sv = perl_get_sv("Coro::API", 1);
		1165
		1166	coroapi.schedule = api_schedule;
		1167	coroapi.cede = api_cede;
		1168	coroapi.ready = api_ready;
		1169	coroapi.is_ready = api_is_ready;
		1170	coroapi.nready = &coro_nready;
		1171	coroapi.current = coro_current;
		1172
		1173	GCoroAPI = &coroapi;
		1174	sv_setiv (sv, (IV)&coroapi);
		1175	SvREADONLY_on (sv);
		1176	}
		1177	}
		1178
		1179	int
		1180	prio (Coro::State coro, int newprio = 0)
		1181	ALIAS:
		1182	nice = 1
697	CODE:	1183	CODE:
		1184	{
		1185	RETVAL = coro->prio;
698		1186
699	if (coro->mainstack && coro->mainstack != main_mainstack)	1187	if (items > 1)
700	{	1188	{
701	struct coro temp;	1189	if (ix)
		1190	newprio += coro->prio;
702		1191
703	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1192	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
704	LOAD(aTHX_ coro);	1193	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
705		1194
706	destroy_stacks (aTHX);	1195	coro->prio = newprio;
707
708	LOAD((&temp)); /* this will get rid of defsv etc.. */
709
710	coro->mainstack = 0;
711	}	1196	}
		1197	}
712		1198
713	if (coro->sptr)	1199	SV *
714	{	1200	ready (SV *self)
715	deallocate_stack (coro);	1201	PROTOTYPE: $
716	coro->sptr = 0;	1202	CODE:
717	}	1203	RETVAL = boolSV (api_ready (self));
		1204	OUTPUT:
		1205	RETVAL
718		1206
719	Safefree (coro);	1207	SV *
		1208	is_ready (SV *self)
		1209	PROTOTYPE: $
		1210	CODE:
		1211	RETVAL = boolSV (api_is_ready (self));
		1212	OUTPUT:
		1213	RETVAL
		1214
		1215	int
		1216	nready (...)
		1217	PROTOTYPE:
		1218	CODE:
		1219	RETVAL = coro_nready;
		1220	OUTPUT:
		1221	RETVAL
720		1222
721	void	1223	void
722	flush()	1224	_set_current (SV *current)
		1225	PROTOTYPE: $
723	CODE:	1226	CODE:
724	#ifdef MAY_FLUSH	1227	SvREFCNT_dec (SvRV (coro_current));
725	flush_padlist_cache ();	1228	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
726	#endif
727		1229
728	MODULE = Coro::State PACKAGE = Coro::Cont	1230	MODULE = Coro::State PACKAGE = Coro::AIO
729		1231
730	# this is slightly dirty	1232	SV *
		1233	_get_state ()
		1234	CODE:
		1235	{
		1236	struct {
		1237	int errorno;
		1238	int laststype;
		1239	int laststatval;
		1240	Stat_t statcache;
		1241	} data;
		1242
		1243	data.errorno = errno;
		1244	data.laststype = PL_laststype;
		1245	data.laststatval = PL_laststatval;
		1246	data.statcache = PL_statcache;
		1247
		1248	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1249	}
		1250	OUTPUT:
		1251	RETVAL
731		1252
732	void	1253	void
733	yield(...)	1254	_set_state (char *data_)
734	PROTOTYPE: @	1255	PROTOTYPE: $
735	CODE:	1256	CODE:
736	static SV *returnstk;	1257	{
737	SV *sv;	1258	struct {
738	AV *defav = GvAV (PL_defgv);	1259	int errorno;
739	struct coro *prev, *next;	1260	int laststype;
		1261	int laststatval;
		1262	Stat_t statcache;
		1263	} *data = (void *)data_;
740		1264
741	if (!returnstk)	1265	errno = data->errorno;
742	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1266	PL_laststype = data->laststype;
743		1267	PL_laststatval = data->laststatval;
744	/* set up @_ -- ugly */	1268	PL_statcache = data->statcache;
745	av_clear (defav);	1269	}
746	av_fill (defav, items - 1);
747	while (items--)
748	av_store (defav, items, SvREFCNT_inc (ST(items)));
749
750	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
751	sv = av_pop ((AV *)SvRV (returnstk));
752	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
753	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
754	SvREFCNT_dec (sv);
755
756	transfer(aTHX_ prev, next, 0);
757

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