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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.143 by root, Wed Feb 28 11:43:03 2007 UTC vs.
Revision 1.229 by root, Thu Apr 10 07:45:33 2008 UTC

1	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4	#define PERL_EXT
2		5
3	#include "EXTERN.h"	6	#include "EXTERN.h"
4	#include "perl.h"	7	#include "perl.h"
5	#include "XSUB.h"	8	#include "XSUB.h"
6		9
7	#include "patchlevel.h"	10	#include "patchlevel.h"
8		11
9	#include <stdio.h>	12	#include <stdio.h>
10	#include <errno.h>	13	#include <errno.h>
11	#include <assert.h>	14	#include <assert.h>
		15	#include <inttypes.h> /* portable stdint.h */
12		16
13	#ifdef HAVE_MMAP	17	#ifdef HAVE_MMAP
14	# include <unistd.h>	18	# include <unistd.h>
15	# include <sys/mman.h>	19	# include <sys/mman.h>
16	# ifndef MAP_ANONYMOUS	20	# ifndef MAP_ANONYMOUS
…		…
68	# ifndef IS_PADCONST	72	# ifndef IS_PADCONST
69	# define IS_PADCONST(v) 0	73	# define IS_PADCONST(v) 0
70	# endif	74	# endif
71	#endif	75	#endif
72		76
		77	/* 5.8.8 */
		78	#ifndef GV_NOTQUAL
		79	# define GV_NOTQUAL 0
		80	#endif
		81	#ifndef newSV
		82	# define newSV(l) NEWSV(0,l)
		83	#endif
		84
		85	/* 5.11 */
		86	#ifndef CxHASARGS
		87	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
		88	#endif
		89
73	/* 5.8.7 */	90	/* 5.8.7 */
74	#ifndef SvRV_set	91	#ifndef SvRV_set
75	# define SvRV_set(s,v) SvRV(s) = (v)	92	# define SvRV_set(s,v) SvRV(s) = (v)
76	#endif	93	#endif
77		94
…		…
86	/* prefer perl internal functions over our own? */	103	/* prefer perl internal functions over our own? */
87	#ifndef CORO_PREFER_PERL_FUNCTIONS	104	#ifndef CORO_PREFER_PERL_FUNCTIONS
88	# define CORO_PREFER_PERL_FUNCTIONS 0	105	# define CORO_PREFER_PERL_FUNCTIONS 0
89	#endif	106	#endif
90		107
91	/* The next macro should declare a variable stacklevel that contains and approximation	108	/* The next macros try to return the current stack pointer, in an as
92	* to the current C stack pointer. Its property is that it changes with each call	109	* portable way as possible. */
93	* and should be unique. */
94	#define dSTACKLEVEL int stacklevel	110	#define dSTACKLEVEL volatile char stacklevel
95	#define STACKLEVEL ((void *)&stacklevel)	111	#define STACKLEVEL ((void *)&stacklevel)
96		112
97	#define IN_DESTRUCT (PL_main_cv == Nullcv)	113	#define IN_DESTRUCT (PL_main_cv == Nullcv)
98		114
99	#if __GNUC__ >= 3	115	#if __GNUC__ >= 3
100	# define attribute(x) __attribute__(x)	116	# define attribute(x) __attribute__(x)
101	# define BARRIER __asm__ __volatile__ ("" : : : "memory")	117	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		118	# define expect(expr,value) __builtin_expect ((expr),(value))
102	#else	119	#else
103	# define attribute(x)	120	# define attribute(x)
104	# define BARRIER	121	# define BARRIER
		122	# define expect(expr,value) (expr)
105	#endif	123	#endif
		124
		125	#define expect_false(expr) expect ((expr) != 0, 0)
		126	#define expect_true(expr) expect ((expr) != 0, 1)
106		127
107	#define NOINLINE attribute ((noinline))	128	#define NOINLINE attribute ((noinline))
108		129
109	#include "CoroAPI.h"	130	#include "CoroAPI.h"
110		131
…		…
124	I32 laststype;	145	I32 laststype;
125	int laststatval;	146	int laststatval;
126	Stat_t statcache;	147	Stat_t statcache;
127	};	148	};
128		149
		150	static size_t coro_stacksize = CORO_STACKSIZE;
129	static struct CoroAPI coroapi;	151	static struct CoroAPI coroapi;
130	static AV *main_mainstack; /* used to differentiate between $main and others */	152	static AV *main_mainstack; /* used to differentiate between $main and others */
		153	static JMPENV *main_top_env;
131	static HV *coro_state_stash, *coro_stash;	154	static HV *coro_state_stash, *coro_stash;
132	static SV *coro_mortal; /* will be freed after next transfer */	155	static volatile SV *coro_mortal; /* will be freed after next transfer */
		156
		157	static GV *irsgv; /* $/ */
		158	static GV *stdoutgv; /* *STDOUT */
		159	static SV *rv_diehook;
		160	static SV *rv_warnhook;
		161	static HV *hv_sig; /* %SIG */
		162
		163	/* async_pool helper stuff */
		164	static SV *sv_pool_rss;
		165	static SV *sv_pool_size;
		166	static AV *av_async_pool;
133		167
134	static struct coro_cctx *cctx_first;	168	static struct coro_cctx *cctx_first;
135	static int cctx_count, cctx_idle;	169	static int cctx_count, cctx_idle;
		170
		171	enum {
		172	CC_MAPPED = 0x01,
		173	CC_NOREUSE = 0x02, /* throw this away after tracing */
		174	CC_TRACE = 0x04,
		175	CC_TRACE_SUB = 0x08, /* trace sub calls */
		176	CC_TRACE_LINE = 0x10, /* trace each statement */
		177	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		178	};
136		179
137	/* this is a structure representing a c-level coroutine */	180	/* this is a structure representing a c-level coroutine */
138	typedef struct coro_cctx {	181	typedef struct coro_cctx {
139	struct coro_cctx *next;	182	struct coro_cctx *next;
140		183
141	/* the stack */	184	/* the stack */
142	void *sptr;	185	void *sptr;
143	ssize_t ssize; /* positive == mmap, otherwise malloc */	186	size_t ssize;
144		187
145	/* cpu state */	188	/* cpu state */
146	void *idle_sp; /* sp of top-level transfer/schedule/cede call */	189	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
147	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */	190	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
148	JMPENV *top_env;	191	JMPENV *top_env;
149	coro_context cctx;	192	coro_context cctx;
150		193
151	int inuse;
152
153	#if CORO_USE_VALGRIND	194	#if CORO_USE_VALGRIND
154	int valgrind_id;	195	int valgrind_id;
155	#endif	196	#endif
		197	unsigned char flags;
156	} coro_cctx;	198	} coro_cctx;
157		199
158	enum {	200	enum {
159	CF_RUNNING = 0x0001, /* coroutine is running */	201	CF_RUNNING = 0x0001, /* coroutine is running */
160	CF_READY = 0x0002, /* coroutine is ready */	202	CF_READY = 0x0002, /* coroutine is ready */
161	CF_NEW = 0x0004, /* has never been switched to */	203	CF_NEW = 0x0004, /* has never been switched to */
162	CF_DESTROYED = 0x0008, /* coroutine data has been freed */	204	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
163	};	205	};
164		206
		207	/* the structure where most of the perl state is stored, overlaid on the cxstack */
		208	typedef struct {
		209	SV *defsv;
		210	AV *defav;
		211	SV *errsv;
		212	SV *irsgv;
		213	#define VAR(name,type) type name;
		214	# include "state.h"
		215	#undef VAR
		216	} perl_slots;
		217
		218	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
		219
165	/* this is a structure representing a perl-level coroutine */	220	/* this is a structure representing a perl-level coroutine */
166	struct coro {	221	struct coro {
167	/* the c coroutine allocated to this perl coroutine, if any */	222	/* the c coroutine allocated to this perl coroutine, if any */
168	coro_cctx *cctx;	223	coro_cctx *cctx;
169		224
		225	/* process data */
		226	AV *mainstack;
		227	perl_slots *slot; /* basically the saved sp */
		228
170	/* data associated with this coroutine (initial args) */	229	AV *args; /* data associated with this coroutine (initial args) */
171	AV *args;	230	int refcnt; /* coroutines are refcounted, yes */
172	int refcnt;
173	int save; /* CORO_SAVE flags */
174	int flags; /* CF_ flags */	231	int flags; /* CF_ flags */
		232	HV *hv; /* the perl hash associated with this coro, if any */
175		233
176	/* optionally saved, might be zero */	234	/* statistics */
177	AV *defav; /* @_ */	235	int usecount; /* number of transfers to this coro */
178	SV *defsv; /* $_ */
179	SV *errsv; /* $@ */
180	SV *irssv; /* $/ */
181	SV *irssv_sv; /* real $/ cache */
182
183	#define VAR(name,type) type name;
184	# include "state.h"
185	#undef VAR
186		236
187	/* coro process data */	237	/* coro process data */
188	int prio;	238	int prio;
		239	SV *throw; /* exception to be thrown */
		240
		241	/* async_pool */
		242	SV *saved_deffh;
		243
		244	/* linked list */
		245	struct coro *next, *prev;
189	};	246	};
190		247
191	typedef struct coro *Coro__State;	248	typedef struct coro *Coro__State;
192	typedef struct coro *Coro__State_or_hashref;	249	typedef struct coro *Coro__State_or_hashref;
193		250
…		…
202		259
203	/* for Coro.pm */	260	/* for Coro.pm */
204	static SV *coro_current;	261	static SV *coro_current;
205	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	262	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
206	static int coro_nready;	263	static int coro_nready;
		264	static struct coro *coro_first;
207		265
208	/** lowlevel stuff **********************************************************/	266	/** lowlevel stuff **********************************************************/
209		267
		268	static SV *
		269	coro_get_sv (pTHX_ const char *name, int create)
		270	{
		271	#if PERL_VERSION_ATLEAST (5,10,0)
		272	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		273	get_sv (name, create);
		274	#endif
		275	return get_sv (name, create);
		276	}
		277
210	static AV *	278	static AV *
		279	coro_get_av (pTHX_ const char *name, int create)
		280	{
		281	#if PERL_VERSION_ATLEAST (5,10,0)
		282	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		283	get_av (name, create);
		284	#endif
		285	return get_av (name, create);
		286	}
		287
		288	static HV *
		289	coro_get_hv (pTHX_ const char *name, int create)
		290	{
		291	#if PERL_VERSION_ATLEAST (5,10,0)
		292	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		293	get_hv (name, create);
		294	#endif
		295	return get_hv (name, create);
		296	}
		297
		298	static AV *
211	coro_clone_padlist (CV *cv)	299	coro_clone_padlist (pTHX_ CV *cv)
212	{	300	{
213	AV *padlist = CvPADLIST (cv);	301	AV *padlist = CvPADLIST (cv);
214	AV *newpadlist, *newpad;	302	AV *newpadlist, *newpad;
215		303
216	newpadlist = newAV ();	304	newpadlist = newAV ();
217	AvREAL_off (newpadlist);	305	AvREAL_off (newpadlist);
218	#if PERL_VERSION_ATLEAST (5,9,0)	306	#if PERL_VERSION_ATLEAST (5,10,0)
219	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);	307	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
220	#else	308	#else
221	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	309	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
222	#endif	310	#endif
223	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	311	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
…		…
228		316
229	return newpadlist;	317	return newpadlist;
230	}	318	}
231		319
232	static void	320	static void
233	free_padlist (AV *padlist)	321	free_padlist (pTHX_ AV *padlist)
234	{	322	{
235	/* may be during global destruction */	323	/* may be during global destruction */
236	if (SvREFCNT (padlist))	324	if (SvREFCNT (padlist))
237	{	325	{
238	I32 i = AvFILLp (padlist);	326	I32 i = AvFILLp (padlist);
…		…
259	AV *padlist;	347	AV *padlist;
260	AV *av = (AV *)mg->mg_obj;	348	AV *av = (AV *)mg->mg_obj;
261		349
262	/* casting is fun. */	350	/* casting is fun. */
263	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	351	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
264	free_padlist (padlist);	352	free_padlist (aTHX_ padlist);
265
266	SvREFCNT_dec (av);
267		353
268	return 0;	354	return 0;
269	}	355	}
270		356
271	#define PERL_MAGIC_coro PERL_MAGIC_ext	357	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
		358	#define CORO_MAGIC_type_state PERL_MAGIC_ext
272		359
273	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	360	static MGVTBL coro_cv_vtbl = {
		361	0, 0, 0, 0,
		362	coro_cv_free
		363	};
274		364
275	#define CORO_MAGIC(cv) \	365	#define CORO_MAGIC(sv,type) \
276	SvMAGIC (cv) \	366	SvMAGIC (sv) \
277	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \	367	? SvMAGIC (sv)->mg_type == type \
278	? SvMAGIC (cv) \	368	? SvMAGIC (sv) \
279	: mg_find ((SV *)cv, PERL_MAGIC_coro) \	369	: mg_find (sv, type) \
280	: 0	370	: 0
		371
		372	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
		373	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
		374
		375	static struct coro *
		376	SvSTATE_ (pTHX_ SV *coro)
		377	{
		378	HV *stash;
		379	MAGIC *mg;
		380
		381	if (SvROK (coro))
		382	coro = SvRV (coro);
		383
		384	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		385	croak ("Coro::State object required");
		386
		387	stash = SvSTASH (coro);
		388	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		389	{
		390	/* very slow, but rare, check */
		391	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		392	croak ("Coro::State object required");
		393	}
		394
		395	mg = CORO_MAGIC_state (coro);
		396	return (struct coro *)mg->mg_ptr;
		397	}
		398
		399	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
281		400
282	/* the next two functions merely cache the padlists */	401	/* the next two functions merely cache the padlists */
283	static void	402	static void
284	get_padlist (CV *cv)	403	get_padlist (pTHX_ CV *cv)
285	{	404	{
286	MAGIC *mg = CORO_MAGIC (cv);	405	MAGIC *mg = CORO_MAGIC_cv (cv);
287	AV *av;	406	AV *av;
288		407
289	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)	408	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
290	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];	409	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
291	else	410	else
292	{	411	{
293	#if CORO_PREFER_PERL_FUNCTIONS	412	#if CORO_PREFER_PERL_FUNCTIONS
294	/* this is probably cleaner, but also slower? */	413	/* this is probably cleaner, but also slower? */
295	CV *cp = Perl_cv_clone (cv);	414	CV *cp = Perl_cv_clone (cv);
296	CvPADLIST (cv) = CvPADLIST (cp);	415	CvPADLIST (cv) = CvPADLIST (cp);
297	CvPADLIST (cp) = 0;	416	CvPADLIST (cp) = 0;
298	SvREFCNT_dec (cp);	417	SvREFCNT_dec (cp);
299	#else	418	#else
300	CvPADLIST (cv) = coro_clone_padlist (cv);	419	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
301	#endif	420	#endif
302	}	421	}
303	}	422	}
304		423
305	static void	424	static void
306	put_padlist (CV *cv)	425	put_padlist (pTHX_ CV *cv)
307	{	426	{
308	MAGIC *mg = CORO_MAGIC (cv);	427	MAGIC *mg = CORO_MAGIC_cv (cv);
309	AV *av;	428	AV *av;
310		429
311	if (!mg)	430	if (expect_false (!mg))
312	{	431	mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
313	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
314	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
315	mg->mg_virtual = &vtbl_coro;
316	mg->mg_obj = (SV *)newAV ();
317	}
318		432
319	av = (AV *)mg->mg_obj;	433	av = (AV *)mg->mg_obj;
320		434
321	if (AvFILLp (av) >= AvMAX (av))	435	if (expect_false (AvFILLp (av) >= AvMAX (av)))
322	av_extend (av, AvMAX (av) + 1);	436	av_extend (av, AvMAX (av) + 1);
323		437
324	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);	438	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
325	}	439	}
326		440
327	/** load & save, init *******************************************************/	441	/** load & save, init *******************************************************/
328		442
329	#define SB do {
330	#define SE } while (0)
331
332	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
333
334	static void	443	static void
335	load_perl (Coro__State c)	444	load_perl (pTHX_ Coro__State c)
336	{	445	{
		446	perl_slots *slot = c->slot;
		447	c->slot = 0;
		448
		449	PL_mainstack = c->mainstack;
		450
		451	GvSV (PL_defgv) = slot->defsv;
		452	GvAV (PL_defgv) = slot->defav;
		453	GvSV (PL_errgv) = slot->errsv;
		454	GvSV (irsgv) = slot->irsgv;
		455
337	#define VAR(name,type) PL_ ## name = c->name;	456	#define VAR(name,type) PL_ ## name = slot->name;
338	# include "state.h"	457	# include "state.h"
339	#undef VAR	458	#undef VAR
340
341	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
342	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
343	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
344	if (c->irssv)
345	{
346	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
347	SvREFCNT_dec (c->irssv);
348	else
349	{
350	REPLACE_SV (PL_rs, c->irssv);
351	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
352	sv_setsv (c->irssv_sv, PL_rs);
353	}
354	}
355		459
356	{	460	{
357	dSP;	461	dSP;
		462
358	CV *cv;	463	CV *cv;
359		464
360	/* now do the ugly restore mess */	465	/* now do the ugly restore mess */
361	while ((cv = (CV *)POPs))	466	while (expect_true (cv = (CV *)POPs))
362	{	467	{
363	put_padlist (cv); /* mark this padlist as available */	468	put_padlist (aTHX_ cv); /* mark this padlist as available */
364	CvDEPTH (cv) = PTR2IV (POPs);	469	CvDEPTH (cv) = PTR2IV (POPs);
365	CvPADLIST (cv) = (AV *)POPs;	470	CvPADLIST (cv) = (AV *)POPs;
366	}	471	}
367		472
368	PUTBACK;	473	PUTBACK;
369	}	474	}
370	assert (!PL_comppad || AvARRAY (PL_comppad));//D
371	}	475	}
372		476
373	static void	477	static void
374	save_perl (Coro__State c)	478	save_perl (pTHX_ Coro__State c)
375	{	479	{
376	assert (!PL_comppad || AvARRAY (PL_comppad));//D
377	{	480	{
378	dSP;	481	dSP;
379	I32 cxix = cxstack_ix;	482	I32 cxix = cxstack_ix;
380	PERL_CONTEXT *ccstk = cxstack;	483	PERL_CONTEXT *ccstk = cxstack;
381	PERL_SI *top_si = PL_curstackinfo;	484	PERL_SI *top_si = PL_curstackinfo;
…		…
383	/*	486	/*
384	* the worst thing you can imagine happens first - we have to save	487	* the worst thing you can imagine happens first - we have to save
385	* (and reinitialize) all cv's in the whole callchain :(	488	* (and reinitialize) all cv's in the whole callchain :(
386	*/	489	*/
387		490
388	EXTEND (SP, 3 + 1);
389	PUSHs (Nullsv);	491	XPUSHs (Nullsv);
390	/* this loop was inspired by pp_caller */	492	/* this loop was inspired by pp_caller */
391	for (;;)	493	for (;;)
392	{	494	{
393	while (cxix >= 0)	495	while (expect_true (cxix >= 0))
394	{	496	{
395	PERL_CONTEXT *cx = &ccstk[cxix--];	497	PERL_CONTEXT *cx = &ccstk[cxix--];
396		498
397	if (CxTYPE (cx) == CXt_SUB)	499	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
398	{	500	{
399	CV *cv = cx->blk_sub.cv;	501	CV *cv = cx->blk_sub.cv;
400		502
401	if (CvDEPTH (cv))	503	if (expect_true (CvDEPTH (cv)))
402	{	504	{
403	EXTEND (SP, 3);	505	EXTEND (SP, 3);
404	PUSHs ((SV *)CvPADLIST (cv));	506	PUSHs ((SV *)CvPADLIST (cv));
405	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));	507	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
406	PUSHs ((SV *)cv);	508	PUSHs ((SV *)cv);
407		509
408	CvDEPTH (cv) = 0;	510	CvDEPTH (cv) = 0;
409	get_padlist (cv);	511	get_padlist (aTHX_ cv);
410	}	512	}
411	}	513	}
412	}	514	}
413		515
414	if (top_si->si_type == PERLSI_MAIN)	516	if (expect_true (top_si->si_type == PERLSI_MAIN))
415	break;	517	break;
416		518
417	top_si = top_si->si_prev;	519	top_si = top_si->si_prev;
418	ccstk = top_si->si_cxstack;	520	ccstk = top_si->si_cxstack;
419	cxix = top_si->si_cxix;	521	cxix = top_si->si_cxix;
420	}	522	}
421		523
422	PUTBACK;	524	PUTBACK;
423	}	525	}
424		526
425	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	527	/* allocate some space on the context stack for our purposes */
426	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	528	/* we manually unroll here, as usually 2 slots is enough */
427	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	529	if (SLOT_COUNT >= 1) CXINC;
428	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;	530	if (SLOT_COUNT >= 2) CXINC;
		531	if (SLOT_COUNT >= 3) CXINC;
		532	{
		533	int i;
		534	for (i = 3; i < SLOT_COUNT; ++i)
		535	CXINC;
		536	}
		537	cxstack_ix -= SLOT_COUNT; /* undo allocation */
429		538
		539	c->mainstack = PL_mainstack;
		540
		541	{
		542	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
		543
		544	slot->defav = GvAV (PL_defgv);
		545	slot->defsv = DEFSV;
		546	slot->errsv = ERRSV;
		547	slot->irsgv = GvSV (irsgv);
		548
430	#define VAR(name,type)c->name = PL_ ## name;	549	#define VAR(name,type) slot->name = PL_ ## name;
431	# include "state.h"	550	# include "state.h"
432	#undef VAR	551	#undef VAR
		552	}
433	}	553	}
434		554
435	/*	555	/*
436	* allocate various perl stacks. This is an exact copy	556	* allocate various perl stacks. This is an exact copy
437	* of perl.c:init_stacks, except that it uses less memory	557	* of perl.c:init_stacks, except that it uses less memory
…		…
440	*/	560	*/
441	#if CORO_PREFER_PERL_FUNCTIONS	561	#if CORO_PREFER_PERL_FUNCTIONS
442	# define coro_init_stacks init_stacks	562	# define coro_init_stacks init_stacks
443	#else	563	#else
444	static void	564	static void
445	coro_init_stacks ()	565	coro_init_stacks (pTHX)
446	{	566	{
447	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));	567	PL_curstackinfo = new_stackinfo(32, 8);
448	PL_curstackinfo->si_type = PERLSI_MAIN;	568	PL_curstackinfo->si_type = PERLSI_MAIN;
449	PL_curstack = PL_curstackinfo->si_stack;	569	PL_curstack = PL_curstackinfo->si_stack;
450	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	570	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
451		571
452	PL_stack_base = AvARRAY(PL_curstack);	572	PL_stack_base = AvARRAY(PL_curstack);
453	PL_stack_sp = PL_stack_base;	573	PL_stack_sp = PL_stack_base;
454	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	574	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
455		575
456	New(50,PL_tmps_stack,128,SV*);	576	New(50,PL_tmps_stack,32,SV*);
457	PL_tmps_floor = -1;	577	PL_tmps_floor = -1;
458	PL_tmps_ix = -1;	578	PL_tmps_ix = -1;
459	PL_tmps_max = 128;	579	PL_tmps_max = 32;
460		580
461	New(54,PL_markstack,32,I32);	581	New(54,PL_markstack,16,I32);
462	PL_markstack_ptr = PL_markstack;	582	PL_markstack_ptr = PL_markstack;
463	PL_markstack_max = PL_markstack + 32;	583	PL_markstack_max = PL_markstack + 16;
464		584
465	#ifdef SET_MARK_OFFSET	585	#ifdef SET_MARK_OFFSET
466	SET_MARK_OFFSET;	586	SET_MARK_OFFSET;
467	#endif	587	#endif
468		588
469	New(54,PL_scopestack,32,I32);	589	New(54,PL_scopestack,8,I32);
470	PL_scopestack_ix = 0;	590	PL_scopestack_ix = 0;
471	PL_scopestack_max = 32;	591	PL_scopestack_max = 8;
472		592
473	New(54,PL_savestack,64,ANY);	593	New(54,PL_savestack,24,ANY);
474	PL_savestack_ix = 0;	594	PL_savestack_ix = 0;
475	PL_savestack_max = 64;	595	PL_savestack_max = 24;
476		596
477	#if !PERL_VERSION_ATLEAST (5,9,0)	597	#if !PERL_VERSION_ATLEAST (5,10,0)
478	New(54,PL_retstack,16,OP*);	598	New(54,PL_retstack,4,OP*);
479	PL_retstack_ix = 0;	599	PL_retstack_ix = 0;
480	PL_retstack_max = 16;	600	PL_retstack_max = 4;
481	#endif	601	#endif
482	}	602	}
483	#endif	603	#endif
484		604
485	/*	605	/*
486	* destroy the stacks, the callchain etc...	606	* destroy the stacks, the callchain etc...
487	*/	607	*/
488	static void	608	static void
489	coro_destroy_stacks ()	609	coro_destroy_stacks (pTHX)
490	{	610	{
491	if (!IN_DESTRUCT)
492	{
493	/* restore all saved variables and stuff */
494	LEAVE_SCOPE (0);
495	assert (PL_tmps_floor == -1);
496
497	/* free all temporaries */
498	FREETMPS;
499	assert (PL_tmps_ix == -1);
500
501	/* unwind all extra stacks */
502	POPSTACK_TO (PL_mainstack);
503
504	/* unwind main stack */
505	dounwind (-1);
506	}
507
508	while (PL_curstackinfo->si_next)	611	while (PL_curstackinfo->si_next)
509	PL_curstackinfo = PL_curstackinfo->si_next;	612	PL_curstackinfo = PL_curstackinfo->si_next;
510		613
511	while (PL_curstackinfo)	614	while (PL_curstackinfo)
512	{	615	{
…		…
522		625
523	Safefree (PL_tmps_stack);	626	Safefree (PL_tmps_stack);
524	Safefree (PL_markstack);	627	Safefree (PL_markstack);
525	Safefree (PL_scopestack);	628	Safefree (PL_scopestack);
526	Safefree (PL_savestack);	629	Safefree (PL_savestack);
527	#if !PERL_VERSION_ATLEAST (5,9,0)	630	#if !PERL_VERSION_ATLEAST (5,10,0)
528	Safefree (PL_retstack);	631	Safefree (PL_retstack);
529	#endif	632	#endif
530	}	633	}
531		634
		635	static size_t
		636	coro_rss (pTHX_ struct coro *coro)
		637	{
		638	size_t rss = sizeof (*coro);
		639
		640	if (coro->mainstack)
		641	{
		642	perl_slots tmp_slot;
		643	perl_slots *slot;
		644
		645	if (coro->flags & CF_RUNNING)
		646	{
		647	slot = &tmp_slot;
		648
		649	#define VAR(name,type) slot->name = PL_ ## name;
		650	# include "state.h"
		651	#undef VAR
		652	}
		653	else
		654	slot = coro->slot;
		655
		656	rss += sizeof (slot->curstackinfo);
		657	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		658	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		659	rss += slot->tmps_max * sizeof (SV *);
		660	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		661	rss += slot->scopestack_max * sizeof (I32);
		662	rss += slot->savestack_max * sizeof (ANY);
		663
		664	#if !PERL_VERSION_ATLEAST (5,10,0)
		665	rss += slot->retstack_max * sizeof (OP *);
		666	#endif
		667	}
		668
		669	return rss;
		670	}
		671
532	/** coroutine stack handling ************************************************/	672	/** coroutine stack handling ************************************************/
533		673
		674	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
		675	static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
		676
		677	/*
		678	* This overrides the default magic get method of %SIG elements.
		679	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
		680	* and instead of tryign to save and restore the hash elements, we just provide
		681	* readback here.
		682	* We only do this when the hook is != 0, as they are often set to 0 temporarily,
		683	* not expecting this to actually change the hook. This is a potential problem
		684	* when a schedule happens then, but we ignore this.
		685	*/
		686	static int
		687	coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
		688	{
		689	const char *s = MgPV_nolen_const (mg);
		690
		691	if (*s == '_')
		692	{
		693	if (strEQ (s, "__DIE__" ) && PL_diehook ) return sv_setsv (sv, PL_diehook ), 0;
		694	if (strEQ (s, "__WARN__") && PL_warnhook) return sv_setsv (sv, PL_warnhook), 0;
		695	}
		696
		697	return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
		698	}
		699
		700	static int
		701	coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
		702	{
		703	const char *s = MgPV_nolen_const (mg);
		704
		705	if (*s == '_')
		706	{
		707	SV **svp = 0;
		708
		709	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		710	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		711
		712	if (svp)
		713	{
		714	SV *old = *svp;
		715	*svp = newSVsv (sv);
		716	SvREFCNT_dec (old);
		717	return;
		718	}
		719	}
		720
		721	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
		722	}
		723
534	static void	724	static void
535	setup_coro (struct coro *coro)	725	coro_setup (pTHX_ struct coro *coro)
536	{	726	{
537	/*	727	/*
538	* emulate part of the perl startup here.	728	* emulate part of the perl startup here.
539	*/	729	*/
540
541	coro_init_stacks ();	730	coro_init_stacks (aTHX);
542		731
		732	PL_runops = RUNOPS_DEFAULT;
543	PL_curcop = &PL_compiling;	733	PL_curcop = &PL_compiling;
544	PL_in_eval = EVAL_NULL;	734	PL_in_eval = EVAL_NULL;
545	PL_comppad = 0;	735	PL_comppad = 0;
546	PL_curpm = 0;	736	PL_curpm = 0;
		737	PL_curpad = 0;
547	PL_localizing = 0;	738	PL_localizing = 0;
548	PL_dirty = 0;	739	PL_dirty = 0;
549	PL_restartop = 0;	740	PL_restartop = 0;
		741	#if PERL_VERSION_ATLEAST (5,10,0)
		742	PL_parser = 0;
		743	#endif
		744
		745	/* recreate the die/warn hooks */
		746	PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
		747	PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
		748
		749	GvSV (PL_defgv) = newSV (0);
		750	GvAV (PL_defgv) = coro->args; coro->args = 0;
		751	GvSV (PL_errgv) = newSV (0);
		752	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		753	PL_rs = newSVsv (GvSV (irsgv));
		754	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
550		755
551	{	756	{
552	dSP;	757	dSP;
553	LOGOP myop;	758	LOGOP myop;
554		759
555	SvREFCNT_dec (GvAV (PL_defgv));
556	GvAV (PL_defgv) = coro->args; coro->args = 0;
557
558	Zero (&myop, 1, LOGOP);	760	Zero (&myop, 1, LOGOP);
559	myop.op_next = Nullop;	761	myop.op_next = Nullop;
560	myop.op_flags = OPf_WANT_VOID;	762	myop.op_flags = OPf_WANT_VOID;
561		763
562	PUSHMARK (SP);	764	PUSHMARK (SP);
563	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));	765	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
564	PUTBACK;	766	PUTBACK;
565	PL_op = (OP *)&myop;	767	PL_op = (OP *)&myop;
566	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	768	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
567	SPAGAIN;	769	SPAGAIN;
568	}	770	}
569		771
570	ENTER; /* necessary e.g. for dounwind */	772	/* this newly created coroutine might be run on an existing cctx which most
		773	* likely was suspended in set_stacklevel, called from entersub.
		774	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		775	* so we ENTER here for symmetry
		776	*/
		777	ENTER;
571	}	778	}
572		779
573	static void	780	static void
		781	coro_destroy (pTHX_ struct coro *coro)
		782	{
		783	if (!IN_DESTRUCT)
		784	{
		785	/* restore all saved variables and stuff */
		786	LEAVE_SCOPE (0);
		787	assert (PL_tmps_floor == -1);
		788
		789	/* free all temporaries */
		790	FREETMPS;
		791	assert (PL_tmps_ix == -1);
		792
		793	/* unwind all extra stacks */
		794	POPSTACK_TO (PL_mainstack);
		795
		796	/* unwind main stack */
		797	dounwind (-1);
		798	}
		799
		800	SvREFCNT_dec (GvSV (PL_defgv));
		801	SvREFCNT_dec (GvAV (PL_defgv));
		802	SvREFCNT_dec (GvSV (PL_errgv));
		803	SvREFCNT_dec (PL_defoutgv);
		804	SvREFCNT_dec (PL_rs);
		805	SvREFCNT_dec (GvSV (irsgv));
		806
		807	SvREFCNT_dec (PL_diehook);
		808	SvREFCNT_dec (PL_warnhook);
		809
		810	SvREFCNT_dec (coro->saved_deffh);
		811	SvREFCNT_dec (coro->throw);
		812
		813	coro_destroy_stacks (aTHX);
		814	}
		815
		816	static void
574	free_coro_mortal ()	817	free_coro_mortal (pTHX)
575	{	818	{
576	if (coro_mortal)	819	if (expect_true (coro_mortal))
577	{	820	{
578	SvREFCNT_dec (coro_mortal);	821	SvREFCNT_dec (coro_mortal);
579	coro_mortal = 0;	822	coro_mortal = 0;
580	}	823	}
581	}	824	}
582		825
		826	static int
		827	runops_trace (pTHX)
		828	{
		829	COP *oldcop = 0;
		830	int oldcxix = -2;
		831	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		832	coro_cctx *cctx = coro->cctx;
		833
		834	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		835	{
		836	PERL_ASYNC_CHECK ();
		837
		838	if (cctx->flags & CC_TRACE_ALL)
		839	{
		840	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
		841	{
		842	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		843	SV **bot, **top;
		844	AV *av = newAV (); /* return values */
		845	SV **cb;
		846	dSP;
		847
		848	GV *gv = CvGV (cx->blk_sub.cv);
		849	SV *fullname = sv_2mortal (newSV (0));
		850	if (isGV (gv))
		851	gv_efullname3 (fullname, gv, 0);
		852
		853	bot = PL_stack_base + cx->blk_oldsp + 1;
		854	top = cx->blk_gimme == G_ARRAY ? SP + 1
		855	: cx->blk_gimme == G_SCALAR ? bot + 1
		856	: bot;
		857
		858	av_extend (av, top - bot);
		859	while (bot < top)
		860	av_push (av, SvREFCNT_inc (*bot++));
		861
		862	PL_runops = RUNOPS_DEFAULT;
		863	ENTER;
		864	SAVETMPS;
		865	EXTEND (SP, 3);
		866	PUSHMARK (SP);
		867	PUSHs (&PL_sv_no);
		868	PUSHs (fullname);
		869	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		870	PUTBACK;
		871	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		872	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		873	SPAGAIN;
		874	FREETMPS;
		875	LEAVE;
		876	PL_runops = runops_trace;
		877	}
		878
		879	if (oldcop != PL_curcop)
		880	{
		881	oldcop = PL_curcop;
		882
		883	if (PL_curcop != &PL_compiling)
		884	{
		885	SV **cb;
		886
		887	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
		888	{
		889	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		890
		891	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
		892	{
		893	runops_proc_t old_runops = PL_runops;
		894	dSP;
		895	GV *gv = CvGV (cx->blk_sub.cv);
		896	SV *fullname = sv_2mortal (newSV (0));
		897
		898	if (isGV (gv))
		899	gv_efullname3 (fullname, gv, 0);
		900
		901	PL_runops = RUNOPS_DEFAULT;
		902	ENTER;
		903	SAVETMPS;
		904	EXTEND (SP, 3);
		905	PUSHMARK (SP);
		906	PUSHs (&PL_sv_yes);
		907	PUSHs (fullname);
		908	PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		909	PUTBACK;
		910	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		911	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		912	SPAGAIN;
		913	FREETMPS;
		914	LEAVE;
		915	PL_runops = runops_trace;
		916	}
		917
		918	oldcxix = cxstack_ix;
		919	}
		920
		921	if (cctx->flags & CC_TRACE_LINE)
		922	{
		923	dSP;
		924
		925	PL_runops = RUNOPS_DEFAULT;
		926	ENTER;
		927	SAVETMPS;
		928	EXTEND (SP, 3);
		929	PL_runops = RUNOPS_DEFAULT;
		930	PUSHMARK (SP);
		931	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		932	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		933	PUTBACK;
		934	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		935	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		936	SPAGAIN;
		937	FREETMPS;
		938	LEAVE;
		939	PL_runops = runops_trace;
		940	}
		941	}
		942	}
		943	}
		944	}
		945
		946	TAINT_NOT;
		947	return 0;
		948	}
		949
583	/* inject a fake call to Coro::State::_cctx_init into the execution */	950	/* inject a fake call to Coro::State::_cctx_init into the execution */
		951	/* _cctx_init should be careful, as it could be called at almost any time */
		952	/* during execution of a perl program */
584	static void NOINLINE	953	static void NOINLINE
585	prepare_cctx (coro_cctx *cctx)	954	cctx_prepare (pTHX_ coro_cctx *cctx)
586	{	955	{
587	dSP;	956	dSP;
588	LOGOP myop;	957	LOGOP myop;
		958
		959	PL_top_env = &PL_start_env;
		960
		961	if (cctx->flags & CC_TRACE)
		962	PL_runops = runops_trace;
589		963
590	Zero (&myop, 1, LOGOP);	964	Zero (&myop, 1, LOGOP);
591	myop.op_next = PL_op;	965	myop.op_next = PL_op;
592	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;	966	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
593		967
…		…
599	PL_op = (OP *)&myop;	973	PL_op = (OP *)&myop;
600	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	974	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
601	SPAGAIN;	975	SPAGAIN;
602	}	976	}
603		977
		978	/*
		979	* this is a _very_ stripped down perl interpreter ;)
		980	*/
604	static void	981	static void
605	coro_run (void *arg)	982	cctx_run (void *arg)
606	{	983	{
		984	dTHX;
		985
607	/* coro_run is the alternative tail of transfer(), so unlock here. */	986	/* cctx_run is the alternative tail of transfer(), so unlock here. */
608	UNLOCK;	987	UNLOCK;
609		988
610	/*	989	/* we now skip the entersub that lead to transfer() */
611	* this is a _very_ stripped down perl interpreter ;)	990	PL_op = PL_op->op_next;
612	*/
613	PL_top_env = &PL_start_env;
614		991
615	/* inject call to cctx_init */	992	/* inject a fake subroutine call to cctx_init */
616	prepare_cctx ((coro_cctx *)arg);	993	cctx_prepare (aTHX_ (coro_cctx *)arg);
617		994
618	/* somebody will hit me for both perl_run and PL_restartop */	995	/* somebody or something will hit me for both perl_run and PL_restartop */
619	PL_restartop = PL_op;	996	PL_restartop = PL_op;
620	perl_run (PL_curinterp);	997	perl_run (PL_curinterp);
621		998
622	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);	999	/*
623	abort ();	1000	* If perl-run returns we assume exit() was being called or the coro
		1001	* fell off the end, which seems to be the only valid (non-bug)
		1002	* reason for perl_run to return. We try to exit by jumping to the
		1003	* bootstrap-time "top" top_env, as we cannot restore the "main"
		1004	* coroutine as Coro has no such concept
		1005	*/
		1006	PL_top_env = main_top_env;
		1007	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
624	}	1008	}
625		1009
626	static coro_cctx *	1010	static coro_cctx *
627	cctx_new ()	1011	cctx_new ()
628	{	1012	{
629	coro_cctx *cctx;	1013	coro_cctx *cctx;
		1014	void *stack_start;
		1015	size_t stack_size;
630		1016
631	++cctx_count;	1017	++cctx_count;
632		1018
633	Newz (0, cctx, 1, coro_cctx);	1019	Newz (0, cctx, 1, coro_cctx);
634		1020
635	#if HAVE_MMAP	1021	#if HAVE_MMAP
636
637	cctx->ssize = ((CORO_STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;	1022	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
638	/* mmap supposedly does allocate-on-write for us */	1023	/* mmap supposedly does allocate-on-write for us */
639	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	1024	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
640		1025
641	if (cctx->sptr != (void *)-1)	1026	if (cctx->sptr != (void *)-1)
642	{	1027	{
643	# if CORO_STACKGUARD	1028	# if CORO_STACKGUARD
644	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);	1029	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
645	# endif	1030	# endif
646	REGISTER_STACK (
647	cctx,
648	CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr,	1031	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
649	cctx->ssize + (char *)cctx->sptr	1032	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
650	);	1033	cctx->flags |= CC_MAPPED;
651
652	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
653	}	1034	}
654	else	1035	else
655	#endif	1036	#endif
656	{	1037	{
657	cctx->ssize = -CORO_STACKSIZE * (long)sizeof (long);	1038	cctx->ssize = coro_stacksize * (long)sizeof (long);
658	New (0, cctx->sptr, CORO_STACKSIZE, long);	1039	New (0, cctx->sptr, coro_stacksize, long);
659		1040
660	if (!cctx->sptr)	1041	if (!cctx->sptr)
661	{	1042	{
662	perror ("FATAL: unable to allocate stack for coroutine");	1043	perror ("FATAL: unable to allocate stack for coroutine");
663	_exit (EXIT_FAILURE);	1044	_exit (EXIT_FAILURE);
664	}	1045	}
665		1046
666	REGISTER_STACK (	1047	stack_start = cctx->sptr;
667	cctx,	1048	stack_size = cctx->ssize;
668	(char *)cctx->sptr,
669	(char *)cctx->sptr - cctx->ssize
670	);
671
672	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, -cctx->ssize);
673	}	1049	}
		1050
		1051	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1052	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
674		1053
675	return cctx;	1054	return cctx;
676	}	1055	}
677		1056
678	static void	1057	static void
…		…
686	#if CORO_USE_VALGRIND	1065	#if CORO_USE_VALGRIND
687	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);	1066	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
688	#endif	1067	#endif
689		1068
690	#if HAVE_MMAP	1069	#if HAVE_MMAP
691	if (cctx->ssize > 0)	1070	if (cctx->flags & CC_MAPPED)
692	munmap (cctx->sptr, cctx->ssize);	1071	munmap (cctx->sptr, cctx->ssize);
693	else	1072	else
694	#endif	1073	#endif
695	Safefree (cctx->sptr);	1074	Safefree (cctx->sptr);
696		1075
697	Safefree (cctx);	1076	Safefree (cctx);
698	}	1077	}
699		1078
		1079	/* wether this cctx should be destructed */
		1080	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1081
700	static coro_cctx *	1082	static coro_cctx *
701	cctx_get ()	1083	cctx_get (pTHX)
702	{	1084	{
703	coro_cctx *cctx;	1085	while (expect_true (cctx_first))
704
705	if (cctx_first)
706	{	1086	{
707	cctx = cctx_first;	1087	coro_cctx *cctx = cctx_first;
708	cctx_first = cctx->next;	1088	cctx_first = cctx->next;
709	--cctx_idle;	1089	--cctx_idle;
710	}	1090
711	else	1091	if (expect_true (!CCTX_EXPIRED (cctx)))
712	{	1092	return cctx;
713	cctx = cctx_new ();	1093
714	PL_op = PL_op->op_next;	1094	cctx_destroy (cctx);
715	}	1095	}
716		1096
717	return cctx;	1097	return cctx_new ();
718	}	1098	}
719		1099
720	static void	1100	static void
721	cctx_put (coro_cctx *cctx)	1101	cctx_put (coro_cctx *cctx)
722	{	1102	{
723	/* free another cctx if overlimit */	1103	/* free another cctx if overlimit */
724	if (cctx_idle >= MAX_IDLE_CCTX)	1104	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
725	{	1105	{
726	coro_cctx *first = cctx_first;	1106	coro_cctx *first = cctx_first;
727	cctx_first = first->next;	1107	cctx_first = first->next;
728	--cctx_idle;	1108	--cctx_idle;
729		1109
730	assert (!first->inuse);
731	cctx_destroy (first);	1110	cctx_destroy (first);
732	}	1111	}
733		1112
734	++cctx_idle;	1113	++cctx_idle;
735	cctx->next = cctx_first;	1114	cctx->next = cctx_first;
736	cctx_first = cctx;	1115	cctx_first = cctx;
737	}	1116	}
738		1117
739	/** coroutine switching *****************************************************/	1118	/** coroutine switching *****************************************************/
740		1119
741	/* never call directly, always through the coro_state_transfer global variable */	1120	static void
		1121	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1122	{
		1123	if (expect_true (prev != next))
		1124	{
		1125	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1126	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1127
		1128	if (expect_false (next->flags & CF_RUNNING))
		1129	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1130
		1131	if (expect_false (next->flags & CF_DESTROYED))
		1132	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1133
		1134	#if !PERL_VERSION_ATLEAST (5,10,0)
		1135	if (expect_false (PL_lex_state != LEX_NOTPARSING)
		1136	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version");
		1137	#endif
		1138	}
		1139	}
		1140
		1141	/* always use the TRANSFER macro */
742	static void NOINLINE	1142	static void NOINLINE
743	transfer (struct coro *prev, struct coro *next)	1143	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
744	{	1144	{
745	dSTACKLEVEL;	1145	dSTACKLEVEL;
		1146	static volatile int has_throw;
746		1147
747	/* sometimes transfer is only called to set idle_sp */	1148	/* sometimes transfer is only called to set idle_sp */
748	if (!next)	1149	if (expect_false (!next))
749	{	1150	{
750	((coro_cctx *)prev)->idle_sp = STACKLEVEL;	1151	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
751	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */	1152	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
752	}	1153	}
753	else if (prev != next)	1154	else if (expect_true (prev != next))
754	{	1155	{
755	coro_cctx *prev__cctx;	1156	coro_cctx *prev__cctx;
756		1157
757	if (prev->flags & CF_NEW)	1158	if (expect_false (prev->flags & CF_NEW))
758	{	1159	{
759	/* create a new empty context */	1160	/* create a new empty context */
760	Newz (0, prev->cctx, 1, coro_cctx);	1161	Newz (0, prev->cctx, 1, coro_cctx);
761	prev->cctx->inuse = 1;
762	prev->flags &= ~CF_NEW;	1162	prev->flags &= ~CF_NEW;
763	prev->flags |= CF_RUNNING;	1163	prev->flags |= CF_RUNNING;
764	}	1164	}
765		1165
766	/*TODO: must not croak here */
767	if (!prev->flags & CF_RUNNING)
768	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
769
770	if (next->flags & CF_RUNNING)
771	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
772
773	if (next->flags & CF_DESTROYED)
774	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
775
776	prev->flags &= ~CF_RUNNING;	1166	prev->flags &= ~CF_RUNNING;
777	next->flags |= CF_RUNNING;	1167	next->flags |= CF_RUNNING;
778		1168
779	LOCK;	1169	LOCK;
780		1170
		1171	/* first get rid of the old state */
		1172	save_perl (aTHX_ prev);
		1173
781	if (next->flags & CF_NEW)	1174	if (expect_false (next->flags & CF_NEW))
782	{	1175	{
783	/* need to start coroutine */	1176	/* need to start coroutine */
784	next->flags &= ~CF_NEW;	1177	next->flags &= ~CF_NEW;
785	/* first get rid of the old state */
786	save_perl (prev);
787	/* setup coroutine call */	1178	/* setup coroutine call */
788	setup_coro (next);	1179	coro_setup (aTHX_ next);
789	/* need a new stack */
790	assert (!next->cctx);
791	}	1180	}
792	else	1181	else
793	{
794	/* coroutine already started */
795	save_perl (prev);
796	load_perl (next);	1182	load_perl (aTHX_ next);
797	}
798		1183
799	prev__cctx = prev->cctx;	1184	prev__cctx = prev->cctx;
800		1185
801	/* possibly "free" the cctx */	1186	/* possibly "free" the cctx */
		1187	if (expect_true (
802	if (prev__cctx->idle_sp == STACKLEVEL)	1188	prev__cctx->idle_sp == STACKLEVEL
		1189	&& !(prev__cctx->flags & CC_TRACE)
		1190	&& !force_cctx
		1191	))
803	{	1192	{
804	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */	1193	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
805	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));	1194	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
806		1195
807	prev->cctx = 0;	1196	prev->cctx = 0;
808		1197
		1198	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1199	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1200	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1201	if (!next->cctx)
		1202	next->cctx = cctx_get (aTHX);
		1203
809	cctx_put (prev__cctx);	1204	cctx_put (prev__cctx);
810	prev__cctx->inuse = 0;
811	}	1205	}
812		1206
		1207	++next->usecount;
		1208
813	if (!next->cctx)	1209	if (expect_true (!next->cctx))
814	{
815	next->cctx = cctx_get ();	1210	next->cctx = cctx_get (aTHX);
816	assert (!next->cctx->inuse);
817	next->cctx->inuse = 1;
818	}
819		1211
		1212	has_throw = !!next->throw;
		1213
820	if (prev__cctx != next->cctx)	1214	if (expect_false (prev__cctx != next->cctx))
821	{	1215	{
822	prev__cctx->top_env = PL_top_env;	1216	prev__cctx->top_env = PL_top_env;
823	PL_top_env = next->cctx->top_env;	1217	PL_top_env = next->cctx->top_env;
824	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);	1218	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
825	}	1219	}
826		1220
827	free_coro_mortal ();	1221	free_coro_mortal (aTHX);
828	UNLOCK;	1222	UNLOCK;
		1223
		1224	if (expect_false (has_throw))
		1225	{
		1226	struct coro *coro = SvSTATE (coro_current);
		1227
		1228	if (coro->throw)
		1229	{
		1230	SV *exception = coro->throw;
		1231	coro->throw = 0;
		1232	sv_setsv (ERRSV, exception);
		1233	croak (0);
		1234	}
		1235	}
829	}	1236	}
830	}	1237	}
831		1238
832	struct transfer_args	1239	struct transfer_args
833	{	1240	{
834	struct coro *prev, *next;	1241	struct coro *prev, *next;
835	};	1242	};
836		1243
		1244	#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
837	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)	1245	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
838		1246
839	/** high level stuff ********************************************************/	1247	/** high level stuff ********************************************************/
840		1248
841	static int	1249	static int
842	coro_state_destroy (struct coro *coro)	1250	coro_state_destroy (pTHX_ struct coro *coro)
843	{	1251	{
844	if (coro->flags & CF_DESTROYED)	1252	if (coro->flags & CF_DESTROYED)
845	return 0;	1253	return 0;
846		1254
847	coro->flags |= CF_DESTROYED;	1255	coro->flags |= CF_DESTROYED;
…		…
859		1267
860	if (coro->mainstack && coro->mainstack != main_mainstack)	1268	if (coro->mainstack && coro->mainstack != main_mainstack)
861	{	1269	{
862	struct coro temp;	1270	struct coro temp;
863		1271
864	assert (!(coro->flags & CF_RUNNING));
865
866	Zero (&temp, 1, struct coro);
867	temp.save = CORO_SAVE_ALL;
868
869	if (coro->flags & CF_RUNNING)	1272	if (coro->flags & CF_RUNNING)
870	croak ("FATAL: tried to destroy currently running coroutine");	1273	croak ("FATAL: tried to destroy currently running coroutine");
871		1274
872	save_perl (&temp);	1275	save_perl (aTHX_ &temp);
873	load_perl (coro);	1276	load_perl (aTHX_ coro);
874		1277
875	coro_destroy_stacks ();	1278	coro_destroy (aTHX_ coro);
876		1279
877	load_perl (&temp); /* this will get rid of defsv etc.. */	1280	load_perl (aTHX_ &temp);
878		1281
879	coro->mainstack = 0;	1282	coro->slot = 0;
880	}	1283	}
881		1284
882	cctx_destroy (coro->cctx);	1285	cctx_destroy (coro->cctx);
883	SvREFCNT_dec (coro->args);	1286	SvREFCNT_dec (coro->args);
884		1287
		1288	if (coro->next) coro->next->prev = coro->prev;
		1289	if (coro->prev) coro->prev->next = coro->next;
		1290	if (coro == coro_first) coro_first = coro->next;
		1291
885	return 1;	1292	return 1;
886	}	1293	}
887		1294
888	static int	1295	static int
889	coro_state_free (pTHX_ SV *sv, MAGIC *mg)	1296	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
890	{	1297	{
891	struct coro *coro = (struct coro *)mg->mg_ptr;	1298	struct coro *coro = (struct coro *)mg->mg_ptr;
892	mg->mg_ptr = 0;	1299	mg->mg_ptr = 0;
893		1300
		1301	coro->hv = 0;
		1302
894	if (--coro->refcnt < 0)	1303	if (--coro->refcnt < 0)
895	{	1304	{
896	coro_state_destroy (coro);	1305	coro_state_destroy (aTHX_ coro);
897	Safefree (coro);	1306	Safefree (coro);
898	}	1307	}
899		1308
900	return 0;	1309	return 0;
901	}	1310	}
…		…
919	#else	1328	#else
920	# define MGf_DUP 0	1329	# define MGf_DUP 0
921	#endif	1330	#endif
922	};	1331	};
923		1332
924	static struct coro *
925	SvSTATE (SV *coro)
926	{
927	HV *stash;
928	MAGIC *mg;
929
930	if (SvROK (coro))
931	coro = SvRV (coro);
932
933	stash = SvSTASH (coro);
934	if (stash != coro_stash && stash != coro_state_stash)
935	{
936	/* very slow, but rare, check */
937	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
938	croak ("Coro::State object required");
939	}
940
941	mg = SvMAGIC (coro);
942	assert (mg->mg_type == PERL_MAGIC_ext);
943	return (struct coro *)mg->mg_ptr;
944	}
945
946	static void	1333	static void
947	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)	1334	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
948	{	1335	{
949	ta->prev = SvSTATE (prev_sv);	1336	ta->prev = SvSTATE (prev_sv);
950	ta->next = SvSTATE (next_sv);	1337	ta->next = SvSTATE (next_sv);
		1338	TRANSFER_CHECK (*ta);
951	}	1339	}
952		1340
953	static void	1341	static void
954	api_transfer (SV *prev_sv, SV *next_sv)	1342	api_transfer (SV *prev_sv, SV *next_sv)
955	{	1343	{
		1344	dTHX;
956	struct transfer_args ta;	1345	struct transfer_args ta;
957		1346
958	prepare_transfer (&ta, prev_sv, next_sv);	1347	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
959	TRANSFER (ta);	1348	TRANSFER (ta, 1);
960	}
961
962	static int
963	api_save (SV *coro_sv, int new_save)
964	{
965	struct coro *coro = SvSTATE (coro_sv);
966	int old_save = coro->save;
967
968	if (new_save >= 0)
969	coro->save = new_save;
970
971	return old_save;
972	}	1349	}
973		1350
974	/** Coro ********************************************************************/	1351	/** Coro ********************************************************************/
975		1352
976	static void	1353	static void
977	coro_enq (SV *coro_sv)	1354	coro_enq (pTHX_ SV *coro_sv)
978	{	1355	{
979	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);	1356	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
980	}	1357	}
981		1358
982	static SV *	1359	static SV *
983	coro_deq (int min_prio)	1360	coro_deq (pTHX)
984	{	1361	{
985	int prio = PRIO_MAX - PRIO_MIN;	1362	int prio;
986		1363
987	min_prio -= PRIO_MIN;
988	if (min_prio < 0)
989	min_prio = 0;
990
991	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1364	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
992	if (AvFILLp (coro_ready [prio]) >= 0)	1365	if (AvFILLp (coro_ready [prio]) >= 0)
993	return av_shift (coro_ready [prio]);	1366	return av_shift (coro_ready [prio]);
994		1367
995	return 0;	1368	return 0;
996	}	1369	}
997		1370
998	static int	1371	static int
999	api_ready (SV *coro_sv)	1372	api_ready (SV *coro_sv)
1000	{	1373	{
		1374	dTHX;
1001	struct coro *coro;	1375	struct coro *coro;
1002		1376
1003	if (SvROK (coro_sv))	1377	if (SvROK (coro_sv))
1004	coro_sv = SvRV (coro_sv);	1378	coro_sv = SvRV (coro_sv);
1005		1379
…		…
1009	return 0;	1383	return 0;
1010		1384
1011	coro->flags |= CF_READY;	1385	coro->flags |= CF_READY;
1012		1386
1013	LOCK;	1387	LOCK;
1014	coro_enq (SvREFCNT_inc (coro_sv));	1388	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
1015	++coro_nready;	1389	++coro_nready;
1016	UNLOCK;	1390	UNLOCK;
1017		1391
1018	return 1;	1392	return 1;
1019	}	1393	}
1020		1394
1021	static int	1395	static int
1022	api_is_ready (SV *coro_sv)	1396	api_is_ready (SV *coro_sv)
1023	{	1397	{
		1398	dTHX;
1024	return !!(SvSTATE (coro_sv)->flags & CF_READY);	1399	return !!(SvSTATE (coro_sv)->flags & CF_READY);
1025	}	1400	}
1026		1401
1027	static void	1402	static void
1028	prepare_schedule (struct transfer_args *ta)	1403	prepare_schedule (pTHX_ struct transfer_args *ta)
1029	{	1404	{
1030	SV *prev_sv, *next_sv;	1405	SV *prev_sv, *next_sv;
1031		1406
1032	for (;;)	1407	for (;;)
1033	{	1408	{
1034	LOCK;	1409	LOCK;
1035	next_sv = coro_deq (PRIO_MIN);	1410	next_sv = coro_deq (aTHX);
1036		1411
1037	/* nothing to schedule: call the idle handler */	1412	/* nothing to schedule: call the idle handler */
1038	if (!next_sv)	1413	if (expect_false (!next_sv))
1039	{	1414	{
1040	dSP;	1415	dSP;
1041	UNLOCK;	1416	UNLOCK;
1042		1417
1043	ENTER;	1418	ENTER;
1044	SAVETMPS;	1419	SAVETMPS;
1045		1420
1046	PUSHMARK (SP);	1421	PUSHMARK (SP);
1047	PUTBACK;	1422	PUTBACK;
1048	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);	1423	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1424	SPAGAIN;
1049		1425
1050	FREETMPS;	1426	FREETMPS;
1051	LEAVE;	1427	LEAVE;
1052	continue;	1428	continue;
1053	}	1429	}
1054		1430
1055	ta->next = SvSTATE (next_sv);	1431	ta->next = SvSTATE (next_sv);
1056		1432
1057	/* cannot transfer to destroyed coros, skip and look for next */	1433	/* cannot transfer to destroyed coros, skip and look for next */
1058	if (ta->next->flags & CF_DESTROYED)	1434	if (expect_false (ta->next->flags & CF_DESTROYED))
1059	{	1435	{
1060	UNLOCK;	1436	UNLOCK;
1061	SvREFCNT_dec (next_sv);	1437	SvREFCNT_dec (next_sv);
1062	/* coro_nready is already taken care of by destroy */	1438	/* coro_nready is already taken care of by destroy */
1063	continue;	1439	continue;
…		…
1068	break;	1444	break;
1069	}	1445	}
1070		1446
1071	/* free this only after the transfer */	1447	/* free this only after the transfer */
1072	prev_sv = SvRV (coro_current);	1448	prev_sv = SvRV (coro_current);
1073	SvRV_set (coro_current, next_sv);
1074	ta->prev = SvSTATE (prev_sv);	1449	ta->prev = SvSTATE (prev_sv);
1075		1450	TRANSFER_CHECK (*ta);
1076	assert (ta->next->flags & CF_READY);	1451	assert (ta->next->flags & CF_READY);
1077	ta->next->flags &= ~CF_READY;	1452	ta->next->flags &= ~CF_READY;
		1453	SvRV_set (coro_current, next_sv);
1078		1454
1079	LOCK;	1455	LOCK;
1080	free_coro_mortal ();	1456	free_coro_mortal (aTHX);
1081	coro_mortal = prev_sv;	1457	coro_mortal = prev_sv;
1082	UNLOCK;	1458	UNLOCK;
1083	}	1459	}
1084		1460
1085	static void	1461	static void
1086	prepare_cede (struct transfer_args *ta)	1462	prepare_cede (pTHX_ struct transfer_args *ta)
1087	{	1463	{
1088	api_ready (coro_current);	1464	api_ready (coro_current);
1089	prepare_schedule (ta);	1465	prepare_schedule (aTHX_ ta);
1090	}	1466	}
1091		1467
1092	static int	1468	static int
1093	prepare_cede_notself (struct transfer_args *ta)	1469	prepare_cede_notself (pTHX_ struct transfer_args *ta)
1094	{	1470	{
1095	if (coro_nready)	1471	if (coro_nready)
1096	{	1472	{
1097	SV *prev = SvRV (coro_current);	1473	SV *prev = SvRV (coro_current);
1098	prepare_schedule (ta);	1474	prepare_schedule (aTHX_ ta);
1099	api_ready (prev);	1475	api_ready (prev);
1100	return 1;	1476	return 1;
1101	}	1477	}
1102	else	1478	else
1103	return 0;	1479	return 0;
1104	}	1480	}
1105		1481
1106	static void	1482	static void
1107	api_schedule (void)	1483	api_schedule (void)
1108	{	1484	{
		1485	dTHX;
1109	struct transfer_args ta;	1486	struct transfer_args ta;
1110		1487
1111	prepare_schedule (&ta);	1488	prepare_schedule (aTHX_ &ta);
1112	TRANSFER (ta);	1489	TRANSFER (ta, 1);
1113	}	1490	}
1114		1491
1115	static int	1492	static int
1116	api_cede (void)	1493	api_cede (void)
1117	{	1494	{
		1495	dTHX;
1118	struct transfer_args ta;	1496	struct transfer_args ta;
1119		1497
1120	prepare_cede (&ta);	1498	prepare_cede (aTHX_ &ta);
1121		1499
1122	if (ta.prev != ta.next)	1500	if (expect_true (ta.prev != ta.next))
1123	{	1501	{
1124	TRANSFER (ta);	1502	TRANSFER (ta, 1);
1125	return 1;	1503	return 1;
1126	}	1504	}
1127	else	1505	else
1128	return 0;	1506	return 0;
1129	}	1507	}
1130		1508
1131	static int	1509	static int
1132	api_cede_notself (void)	1510	api_cede_notself (void)
1133	{	1511	{
		1512	dTHX;
1134	struct transfer_args ta;	1513	struct transfer_args ta;
1135		1514
1136	if (prepare_cede_notself (&ta))	1515	if (prepare_cede_notself (aTHX_ &ta))
1137	{	1516	{
1138	TRANSFER (ta);	1517	TRANSFER (ta, 1);
1139	return 1;	1518	return 1;
1140	}	1519	}
1141	else	1520	else
1142	return 0;	1521	return 0;
1143	}	1522	}
1144		1523
		1524	static void
		1525	api_trace (SV *coro_sv, int flags)
		1526	{
		1527	dTHX;
		1528	struct coro *coro = SvSTATE (coro_sv);
		1529
		1530	if (flags & CC_TRACE)
		1531	{
		1532	if (!coro->cctx)
		1533	coro->cctx = cctx_new ();
		1534	else if (!(coro->cctx->flags & CC_TRACE))
		1535	croak ("cannot enable tracing on coroutine with custom stack");
		1536
		1537	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1538	}
		1539	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1540	{
		1541	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1542
		1543	if (coro->flags & CF_RUNNING)
		1544	PL_runops = RUNOPS_DEFAULT;
		1545	else
		1546	coro->slot->runops = RUNOPS_DEFAULT;
		1547	}
		1548	}
		1549
1145	MODULE = Coro::State PACKAGE = Coro::State	1550	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1146		1551
1147	PROTOTYPES: DISABLE	1552	PROTOTYPES: DISABLE
1148		1553
1149	BOOT:	1554	BOOT:
1150	{	1555	{
1151	#ifdef USE_ITHREADS	1556	#ifdef USE_ITHREADS
1152	MUTEX_INIT (&coro_mutex);	1557	MUTEX_INIT (&coro_mutex);
1153	#endif	1558	#endif
1154	BOOT_PAGESIZE;	1559	BOOT_PAGESIZE;
1155		1560
		1561	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1562	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1563
		1564	orig_sigelem_get = PL_vtbl_sigelem.svt_get;
		1565	PL_vtbl_sigelem.svt_get = coro_sigelem_get;
		1566	orig_sigelem_set = PL_vtbl_sigelem.svt_set;
		1567	PL_vtbl_sigelem.svt_set = coro_sigelem_set;
		1568
		1569	hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
		1570	rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
		1571	rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
		1572
1156	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1573	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
1157		1574
		1575	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
		1576	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
1158	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));	1577	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
1159	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
1160	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
1161	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
1162	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));	1578	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
1163		1579
1164	main_mainstack = PL_mainstack;	1580	main_mainstack = PL_mainstack;
		1581	main_top_env = PL_top_env;
		1582
		1583	while (main_top_env->je_prev)
		1584	main_top_env = main_top_env->je_prev;
1165		1585
1166	coroapi.ver = CORO_API_VERSION;	1586	coroapi.ver = CORO_API_VERSION;
		1587	coroapi.rev = CORO_API_REVISION;
1167	coroapi.transfer = api_transfer;	1588	coroapi.transfer = api_transfer;
1168		1589
1169	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1590	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1170	}	1591	}
1171		1592
1172	SV *	1593	SV *
1173	new (char *klass, ...)	1594	new (char *klass, ...)
1174	CODE:	1595	CODE:
1175	{	1596	{
1176	struct coro *coro;	1597	struct coro *coro;
		1598	MAGIC *mg;
1177	HV *hv;	1599	HV *hv;
1178	int i;	1600	int i;
1179		1601
1180	Newz (0, coro, 1, struct coro);	1602	Newz (0, coro, 1, struct coro);
1181	coro->args = newAV ();	1603	coro->args = newAV ();
1182	coro->save = CORO_SAVE_ALL;
1183	coro->flags = CF_NEW;	1604	coro->flags = CF_NEW;
1184		1605
		1606	if (coro_first) coro_first->prev = coro;
		1607	coro->next = coro_first;
		1608	coro_first = coro;
		1609
1185	hv = newHV ();	1610	coro->hv = hv = newHV ();
1186	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1611	mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
		1612	mg->mg_flags |= MGf_DUP;
1187	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1613	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1188		1614
		1615	av_extend (coro->args, items - 1);
1189	for (i = 1; i < items; i++)	1616	for (i = 1; i < items; i++)
1190	av_push (coro->args, newSVsv (ST (i)));	1617	av_push (coro->args, newSVsv (ST (i)));
1191	}	1618	}
1192	OUTPUT:	1619	OUTPUT:
1193	RETVAL	1620	RETVAL
1194		1621
1195	int	1622	# these not obviously related functions are all rolled into the same xs
1196	save (SV *coro, int new_save = -1)	1623	# function to increase chances that they all will call transfer with the same
1197	CODE:	1624	# stack offset
1198	RETVAL = api_save (coro, new_save);
1199	OUTPUT:
1200	RETVAL
1201
1202	void	1625	void
1203	_set_stacklevel (...)	1626	_set_stacklevel (...)
1204	ALIAS:	1627	ALIAS:
1205	Coro::State::transfer = 1	1628	Coro::State::transfer = 1
1206	Coro::schedule = 2	1629	Coro::schedule = 2
…		…
1208	Coro::cede_notself = 4	1631	Coro::cede_notself = 4
1209	CODE:	1632	CODE:
1210	{	1633	{
1211	struct transfer_args ta;	1634	struct transfer_args ta;
1212		1635
		1636	PUTBACK;
1213	switch (ix)	1637	switch (ix)
1214	{	1638	{
1215	case 0:	1639	case 0:
1216	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));	1640	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1217	ta.next = 0;	1641	ta.next = 0;
…		…
1219		1643
1220	case 1:	1644	case 1:
1221	if (items != 2)	1645	if (items != 2)
1222	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);	1646	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1223		1647
1224	prepare_transfer (&ta, ST (0), ST (1));	1648	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
1225	break;	1649	break;
1226		1650
1227	case 2:	1651	case 2:
1228	prepare_schedule (&ta);	1652	prepare_schedule (aTHX_ &ta);
1229	break;	1653	break;
1230		1654
1231	case 3:	1655	case 3:
1232	prepare_cede (&ta);	1656	prepare_cede (aTHX_ &ta);
1233	break;	1657	break;
1234		1658
1235	case 4:	1659	case 4:
1236	if (!prepare_cede_notself (&ta))	1660	if (!prepare_cede_notself (aTHX_ &ta))
1237	XSRETURN_EMPTY;	1661	XSRETURN_EMPTY;
1238		1662
1239	break;	1663	break;
1240	}	1664	}
		1665	SPAGAIN;
1241		1666
1242	BARRIER;	1667	BARRIER;
		1668	PUTBACK;
1243	TRANSFER (ta);	1669	TRANSFER (ta, 0);
1244		1670	SPAGAIN; /* might be the sp of a different coroutine now */
1245	if (GIMME_V != G_VOID && ta.next != ta.prev)	1671	/* be extra careful not to ever do anything after TRANSFER */
1246	XSRETURN_YES;
1247	}	1672	}
1248		1673
1249	bool	1674	bool
1250	_destroy (SV *coro_sv)	1675	_destroy (SV *coro_sv)
1251	CODE:	1676	CODE:
1252	RETVAL = coro_state_destroy (SvSTATE (coro_sv));	1677	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
1253	OUTPUT:	1678	OUTPUT:
1254	RETVAL	1679	RETVAL
1255		1680
1256	void	1681	void
1257	_exit (code)	1682	_exit (code)
…		…
1259	PROTOTYPE: $	1684	PROTOTYPE: $
1260	CODE:	1685	CODE:
1261	_exit (code);	1686	_exit (code);
1262		1687
1263	int	1688	int
		1689	cctx_stacksize (int new_stacksize = 0)
		1690	CODE:
		1691	RETVAL = coro_stacksize;
		1692	if (new_stacksize)
		1693	coro_stacksize = new_stacksize;
		1694	OUTPUT:
		1695	RETVAL
		1696
		1697	int
1264	cctx_count ()	1698	cctx_count ()
1265	CODE:	1699	CODE:
1266	RETVAL = cctx_count;	1700	RETVAL = cctx_count;
1267	OUTPUT:	1701	OUTPUT:
1268	RETVAL	1702	RETVAL
…		…
1272	CODE:	1706	CODE:
1273	RETVAL = cctx_idle;	1707	RETVAL = cctx_idle;
1274	OUTPUT:	1708	OUTPUT:
1275	RETVAL	1709	RETVAL
1276		1710
		1711	void
		1712	list ()
		1713	PPCODE:
		1714	{
		1715	struct coro *coro;
		1716	for (coro = coro_first; coro; coro = coro->next)
		1717	if (coro->hv)
		1718	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1719	}
		1720
		1721	void
		1722	call (Coro::State coro, SV *coderef)
		1723	ALIAS:
		1724	eval = 1
		1725	CODE:
		1726	{
		1727	if (coro->mainstack)
		1728	{
		1729	struct coro temp;
		1730
		1731	if (!(coro->flags & CF_RUNNING))
		1732	{
		1733	PUTBACK;
		1734	save_perl (aTHX_ &temp);
		1735	load_perl (aTHX_ coro);
		1736	}
		1737
		1738	{
		1739	dSP;
		1740	ENTER;
		1741	SAVETMPS;
		1742	PUTBACK;
		1743	PUSHSTACK;
		1744	PUSHMARK (SP);
		1745
		1746	if (ix)
		1747	eval_sv (coderef, 0);
		1748	else
		1749	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1750
		1751	POPSTACK;
		1752	SPAGAIN;
		1753	FREETMPS;
		1754	LEAVE;
		1755	PUTBACK;
		1756	}
		1757
		1758	if (!(coro->flags & CF_RUNNING))
		1759	{
		1760	save_perl (aTHX_ coro);
		1761	load_perl (aTHX_ &temp);
		1762	SPAGAIN;
		1763	}
		1764	}
		1765	}
		1766
		1767	SV *
		1768	is_ready (Coro::State coro)
		1769	PROTOTYPE: $
		1770	ALIAS:
		1771	is_ready = CF_READY
		1772	is_running = CF_RUNNING
		1773	is_new = CF_NEW
		1774	is_destroyed = CF_DESTROYED
		1775	CODE:
		1776	RETVAL = boolSV (coro->flags & ix);
		1777	OUTPUT:
		1778	RETVAL
		1779
		1780	void
		1781	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1782
		1783	SV *
		1784	has_stack (Coro::State coro)
		1785	PROTOTYPE: $
		1786	CODE:
		1787	RETVAL = boolSV (!!coro->cctx);
		1788	OUTPUT:
		1789	RETVAL
		1790
		1791	int
		1792	is_traced (Coro::State coro)
		1793	PROTOTYPE: $
		1794	CODE:
		1795	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1796	OUTPUT:
		1797	RETVAL
		1798
		1799	IV
		1800	rss (Coro::State coro)
		1801	PROTOTYPE: $
		1802	ALIAS:
		1803	usecount = 1
		1804	CODE:
		1805	switch (ix)
		1806	{
		1807	case 0: RETVAL = coro_rss (aTHX_ coro); break;
		1808	case 1: RETVAL = coro->usecount; break;
		1809	}
		1810	OUTPUT:
		1811	RETVAL
		1812
		1813	void
		1814	force_cctx ()
		1815	CODE:
		1816	struct coro *coro = SvSTATE (coro_current);
		1817	coro->cctx->idle_sp = 0;
		1818
1277	MODULE = Coro::State PACKAGE = Coro	1819	MODULE = Coro::State PACKAGE = Coro
1278		1820
1279	BOOT:	1821	BOOT:
1280	{	1822	{
1281	int i;	1823	int i;
1282		1824
		1825	sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
		1826	sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
		1827	av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
		1828
		1829	coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
		1830	SvREADONLY_on (coro_current);
		1831
1283	coro_stash = gv_stashpv ("Coro", TRUE);	1832	coro_stash = gv_stashpv ("Coro", TRUE);
1284		1833
1285	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));	1834	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1286	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1835	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1287	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1836	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1288	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1837	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1289	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1838	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1290	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1839	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1291		1840
1292	coro_current = get_sv ("Coro::current", FALSE);
1293	SvREADONLY_on (coro_current);
1294
1295	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1841	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1296	coro_ready[i] = newAV ();	1842	coro_ready[i] = newAV ();
1297		1843
1298	{	1844	{
1299	SV *sv = perl_get_sv("Coro::API", 1);	1845	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1846	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
1300		1847
1301	coroapi.schedule = api_schedule;	1848	coroapi.schedule = api_schedule;
1302	coroapi.save = api_save;
1303	coroapi.cede = api_cede;	1849	coroapi.cede = api_cede;
1304	coroapi.cede_notself = api_cede_notself;	1850	coroapi.cede_notself = api_cede_notself;
1305	coroapi.ready = api_ready;	1851	coroapi.ready = api_ready;
1306	coroapi.is_ready = api_is_ready;	1852	coroapi.is_ready = api_is_ready;
1307	coroapi.nready = &coro_nready;	1853	coroapi.nready = &coro_nready;
…		…
1348	CODE:	1894	CODE:
1349	RETVAL = boolSV (api_ready (self));	1895	RETVAL = boolSV (api_ready (self));
1350	OUTPUT:	1896	OUTPUT:
1351	RETVAL	1897	RETVAL
1352		1898
1353	SV *
1354	is_ready (SV *self)
1355	PROTOTYPE: $
1356	CODE:
1357	RETVAL = boolSV (api_is_ready (self));
1358	OUTPUT:
1359	RETVAL
1360
1361	int	1899	int
1362	nready (...)	1900	nready (...)
1363	PROTOTYPE:	1901	PROTOTYPE:
1364	CODE:	1902	CODE:
1365	RETVAL = coro_nready;	1903	RETVAL = coro_nready;
1366	OUTPUT:	1904	OUTPUT:
1367	RETVAL	1905	RETVAL
1368		1906
		1907	void
		1908	throw (Coro::State self, SV *throw = &PL_sv_undef)
		1909	PROTOTYPE: $;$
		1910	CODE:
		1911	SvREFCNT_dec (self->throw);
		1912	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1913
		1914	void
		1915	swap_defsv (Coro::State self)
		1916	PROTOTYPE: $
		1917	ALIAS:
		1918	swap_defav = 1
		1919	CODE:
		1920	if (!self->slot)
		1921	croak ("cannot swap state with coroutine that has no saved state");
		1922	else
		1923	{
		1924	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
		1925	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
		1926
		1927	SV *tmp = *src; *src = *dst; *dst = tmp;
		1928	}
		1929
		1930	# for async_pool speedup
		1931	void
		1932	_pool_1 (SV *cb)
		1933	CODE:
		1934	{
		1935	struct coro *coro = SvSTATE (coro_current);
		1936	HV *hv = (HV *)SvRV (coro_current);
		1937	AV *defav = GvAV (PL_defgv);
		1938	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1939	AV *invoke_av;
		1940	int i, len;
		1941
		1942	if (!invoke)
		1943	{
		1944	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1945	croak ("\3async_pool terminate\2\n");
		1946	}
		1947
		1948	SvREFCNT_dec (coro->saved_deffh);
		1949	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1950
		1951	hv_store (hv, "desc", sizeof ("desc") - 1,
		1952	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1953
		1954	invoke_av = (AV *)SvRV (invoke);
		1955	len = av_len (invoke_av);
		1956
		1957	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1958
		1959	if (len > 0)
		1960	{
		1961	av_fill (defav, len - 1);
		1962	for (i = 0; i < len; ++i)
		1963	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1964	}
		1965
		1966	SvREFCNT_dec (invoke);
		1967	}
		1968
		1969	void
		1970	_pool_2 (SV *cb)
		1971	CODE:
		1972	{
		1973	struct coro *coro = SvSTATE (coro_current);
		1974
		1975	sv_setsv (cb, &PL_sv_undef);
		1976
		1977	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		1978	coro->saved_deffh = 0;
		1979
		1980	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1981	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1982	{
		1983	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1984	croak ("\3async_pool terminate\2\n");
		1985	}
		1986
		1987	av_clear (GvAV (PL_defgv));
		1988	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1989	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1990
		1991	coro->prio = 0;
		1992
		1993	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1994	api_trace (coro_current, 0);
		1995
		1996	av_push (av_async_pool, newSVsv (coro_current));
		1997	}
		1998
		1999
1369	MODULE = Coro::State PACKAGE = Coro::AIO	2000	MODULE = Coro::State PACKAGE = Coro::AIO
1370		2001
1371	SV *	2002	SV *
1372	_get_state ()	2003	_get_state ()
1373	CODE:	2004	CODE:

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