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Comparing Coro/Coro/State.xs (file contents):
Revision 1.15 by root, Wed Jul 25 04:14:38 2001 UTC vs.
Revision 1.222 by root, Sun Jan 20 10:22:07 2008 UTC

		1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4	#define PERL_EXT
		5
1	#include "EXTERN.h"	6	#include "EXTERN.h"
2	#include "perl.h"	7	#include "perl.h"
3	#include "XSUB.h"	8	#include "XSUB.h"
4		9
5	#include "libcoro/coro.c"	10	#include "patchlevel.h"
		11
		12	#include <stdio.h>
		13	#include <errno.h>
		14	#include <assert.h>
		15	#include <inttypes.h> /* portable stdint.h */
6		16
7	#ifdef HAVE_MMAP	17	#ifdef HAVE_MMAP
8	# include <unistd.h>	18	# include <unistd.h>
9	# include <sys/mman.h>	19	# include <sys/mman.h>
		20	# ifndef MAP_ANONYMOUS
		21	# ifdef MAP_ANON
		22	# define MAP_ANONYMOUS MAP_ANON
		23	# else
		24	# undef HAVE_MMAP
		25	# endif
10	#endif	26	# endif
11		27	# include <limits.h>
12	#define MAY_FLUSH /* increases codesize */	28	# ifndef PAGESIZE
13		29	# define PAGESIZE pagesize
14	/* perl-related */	30	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
15	#define TRANSFER_SAVE_DEFAV 0x00000001	31	static long pagesize;
16	#define TRANSFER_SAVE_DEFSV 0x00000002	32	# else
17	#define TRANSFER_SAVE_ERRSV 0x00000004	33	# define BOOT_PAGESIZE (void)0
18	/* c-related */	34	# endif
19	#define TRANSFER_SAVE_CCTXT 0x00000008
20	#ifdef CORO_LAZY_STACK
21	# define TRANSFER_LAZY_STACK 0x00000010
22	#else	35	#else
23	# define TRANSFER_LAZY_STACK 0x00000000	36	# define PAGESIZE 0
		37	# define BOOT_PAGESIZE (void)0
		38	#endif
		39
		40	#if CORO_USE_VALGRIND
		41	# include <valgrind/valgrind.h>
		42	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		43	#else
		44	# define REGISTER_STACK(cctx,start,end)
		45	#endif
		46
		47	/* the maximum number of idle cctx that will be pooled */
		48	#define MAX_IDLE_CCTX 8
		49
		50	#define PERL_VERSION_ATLEAST(a,b,c) \
		51	(PERL_REVISION > (a) \
		52	|| (PERL_REVISION == (a) \
		53	&& (PERL_VERSION > (b) \
		54	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		55
		56	#if !PERL_VERSION_ATLEAST (5,6,0)
		57	# ifndef PL_ppaddr
		58	# define PL_ppaddr ppaddr
24	#endif	59	# endif
		60	# ifndef call_sv
		61	# define call_sv perl_call_sv
		62	# endif
		63	# ifndef get_sv
		64	# define get_sv perl_get_sv
		65	# endif
		66	# ifndef get_cv
		67	# define get_cv perl_get_cv
		68	# endif
		69	# ifndef IS_PADGV
		70	# define IS_PADGV(v) 0
		71	# endif
		72	# ifndef IS_PADCONST
		73	# define IS_PADCONST(v) 0
		74	# endif
		75	#endif
25		76
26	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	77	/* 5.8.7 */
27	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	78	#ifndef SvRV_set
		79	# define SvRV_set(s,v) SvRV(s) = (v)
		80	#endif
28		81
29	#define SUB_INIT "Coro::State::initialize"	82	/* 5.8.8 */
30	#define UCORO_STATE "_coro_state"	83	#ifndef GV_NOTQUAL
		84	# define GV_NOTQUAL 0
		85	#endif
		86	#ifndef newSV
		87	# define newSV(l) NEWSV(0,l)
		88	#endif
31		89
32	/* The next macro should delcare a variable stacklevel that contains and approximation	90	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
33	* to the current C stack pointer. It's property is that it changes with each call	91	# undef CORO_STACKGUARD
34	* and should be unique. */	92	#endif
		93
		94	#ifndef CORO_STACKGUARD
		95	# define CORO_STACKGUARD 0
		96	#endif
		97
		98	/* prefer perl internal functions over our own? */
		99	#ifndef CORO_PREFER_PERL_FUNCTIONS
		100	# define CORO_PREFER_PERL_FUNCTIONS 0
		101	#endif
		102
		103	/* The next macros try to return the current stack pointer, in an as
		104	* portable way as possible. */
		105	#define dSTACKLEVEL volatile char stacklevel
35	#define dSTACKLEVEL void *stacklevel = &stacklevel	106	#define STACKLEVEL ((void *)&stacklevel)
36		107
37	#define labs(l) ((l) >= 0 ? (l) : -(l))	108	#define IN_DESTRUCT (PL_main_cv == Nullcv)
38		109
39	/* this is actually not only the c stack but also c registers etc... */	110	#if __GNUC__ >= 3
		111	# define attribute(x) __attribute__(x)
		112	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		113	# define expect(expr,value) __builtin_expect ((expr),(value))
		114	#else
		115	# define attribute(x)
		116	# define BARRIER
		117	# define expect(expr,value) (expr)
		118	#endif
		119
		120	#define expect_false(expr) expect ((expr) != 0, 0)
		121	#define expect_true(expr) expect ((expr) != 0, 1)
		122
		123	#define NOINLINE attribute ((noinline))
		124
		125	#include "CoroAPI.h"
		126
		127	#ifdef USE_ITHREADS
		128	static perl_mutex coro_mutex;
		129	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		130	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		131	#else
		132	# define LOCK (void)0
		133	# define UNLOCK (void)0
		134	#endif
		135
		136	/* helper storage struct for Coro::AIO */
		137	struct io_state
		138	{
		139	int errorno;
		140	I32 laststype;
		141	int laststatval;
		142	Stat_t statcache;
		143	};
		144
		145	static size_t coro_stacksize = CORO_STACKSIZE;
		146	static struct CoroAPI coroapi;
		147	static AV *main_mainstack; /* used to differentiate between $main and others */
		148	static JMPENV *main_top_env;
		149	static HV *coro_state_stash, *coro_stash;
		150	static volatile SV *coro_mortal; /* will be freed after next transfer */
		151
		152	static GV *irsgv; /* $/ */
		153	static GV *stdoutgv; /* *STDOUT */
		154	static SV *rv_diehook;
		155	static SV *rv_warnhook;
		156	static HV *hv_sig; /* %SIG */
		157
		158	/* async_pool helper stuff */
		159	static SV *sv_pool_rss;
		160	static SV *sv_pool_size;
		161	static AV *av_async_pool;
		162
		163	static struct coro_cctx *cctx_first;
		164	static int cctx_count, cctx_idle;
		165
		166	enum {
		167	CC_MAPPED = 0x01,
		168	CC_NOREUSE = 0x02, /* throw this away after tracing */
		169	CC_TRACE = 0x04,
		170	CC_TRACE_SUB = 0x08, /* trace sub calls */
		171	CC_TRACE_LINE = 0x10, /* trace each statement */
		172	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		173	};
		174
		175	/* this is a structure representing a c-level coroutine */
		176	typedef struct coro_cctx {
		177	struct coro_cctx *next;
		178
		179	/* the stack */
		180	void *sptr;
		181	size_t ssize;
		182
		183	/* cpu state */
		184	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		185	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		186	JMPENV *top_env;
		187	coro_context cctx;
		188
		189	#if CORO_USE_VALGRIND
		190	int valgrind_id;
		191	#endif
		192	unsigned char flags;
		193	} coro_cctx;
		194
		195	enum {
		196	CF_RUNNING = 0x0001, /* coroutine is running */
		197	CF_READY = 0x0002, /* coroutine is ready */
		198	CF_NEW = 0x0004, /* has never been switched to */
		199	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		200	};
		201
		202	/* the structure where most of the perl state is stored, overlaid on the cxstack */
40	typedef struct {	203	typedef struct {
41	int refcnt; /* pointer reference counter */	204	SV *defsv;
42	int usecnt; /* shared by how many coroutines */	205	AV *defav;
43	int gencnt; /* generation counter */	206	SV *errsv;
		207	SV *irsgv;
		208	#define VAR(name,type) type name;
		209	# include "state.h"
		210	#undef VAR
		211	} perl_slots;
44		212
45	coro_context cctx;	213	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
46		214
47	void *sptr;	215	/* this is a structure representing a perl-level coroutine */
48	long ssize; /* positive == mmap, otherwise malloc */
49	} coro_stack;
50
51	static coro_stack main_stack = { 1, 0, 0 };
52
53	struct coro {	216	struct coro {
54	/* the optional C context */	217	/* the c coroutine allocated to this perl coroutine, if any */
55	coro_stack *stack;	218	coro_cctx *cctx;
56	void *cursp;
57	int gencnt;
58		219
59	/* optionally saved, might be zero */	220	/* process data */
60	AV *defav;
61	SV *defsv;
62	SV *errsv;
63
64	/* saved global state not related to stacks */
65	U8 dowarn;
66
67	/* the stacks and related info (callchain etc..) */
68	PERL_SI *curstackinfo;
69	AV *curstack;
70	AV *mainstack;	221	AV *mainstack;
71	SV **stack_sp;	222	perl_slots *slot; /* basically the saved sp */
72	OP *op;
73	SV **curpad;
74	SV **stack_base;
75	SV **stack_max;
76	SV **tmps_stack;
77	I32 tmps_floor;
78	I32 tmps_ix;
79	I32 tmps_max;
80	I32 *markstack;
81	I32 *markstack_ptr;
82	I32 *markstack_max;
83	I32 *scopestack;
84	I32 scopestack_ix;
85	I32 scopestack_max;
86	ANY *savestack;
87	I32 savestack_ix;
88	I32 savestack_max;
89	OP **retstack;
90	I32 retstack_ix;
91	I32 retstack_max;
92	COP *curcop;
93	JMPENV start_env;
94	JMPENV *top_env;
95		223
96	/* data associated with this coroutine (initial args) */	224	AV *args; /* data associated with this coroutine (initial args) */
97	AV *args;	225	int refcnt; /* coroutines are refcounted, yes */
		226	int flags; /* CF_ flags */
		227	HV *hv; /* the perl hash associated with this coro, if any */
		228
		229	/* statistics */
		230	int usecount; /* number of transfers to this coro */
		231
		232	/* coro process data */
		233	int prio;
		234	SV *throw; /* exception to be thrown */
		235
		236	/* async_pool */
		237	SV *saved_deffh;
		238
		239	/* linked list */
		240	struct coro *next, *prev;
98	};	241	};
99		242
100	typedef struct coro *Coro__State;	243	typedef struct coro *Coro__State;
101	typedef struct coro *Coro__State_or_hashref;	244	typedef struct coro *Coro__State_or_hashref;
102		245
103	static AV *main_mainstack; /* used to differentiate between $main and others */	246	/** Coro ********************************************************************/
104	static HV *coro_state_stash;
105	static SV *ucoro_state_sv;
106	static U32 ucoro_state_hash;
107	static HV *padlist_cache;
108		247
109	/* mostly copied from op.c:cv_clone2 */	248	#define PRIO_MAX 3
110	STATIC AV *	249	#define PRIO_HIGH 1
111	clone_padlist (AV *protopadlist)	250	#define PRIO_NORMAL 0
		251	#define PRIO_LOW -1
		252	#define PRIO_IDLE -3
		253	#define PRIO_MIN -4
		254
		255	/* for Coro.pm */
		256	static SV *coro_current;
		257	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		258	static int coro_nready;
		259	static struct coro *coro_first;
		260
		261	/** lowlevel stuff **********************************************************/
		262
		263	static SV *
		264	coro_get_sv (pTHX_ const char *name, int create)
112	{	265	{
113	AV *av;	266	#if PERL_VERSION_ATLEAST (5,9,0)
114	I32 ix;	267	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
115	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);	268	get_sv (name, create);
116	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);	269	#endif
117	SV **pname = AvARRAY (protopad_name);	270	return get_sv (name, create);
118	SV **ppad = AvARRAY (protopad);	271	}
119	I32 fname = AvFILLp (protopad_name);	272
120	I32 fpad = AvFILLp (protopad);	273	static AV *
		274	coro_get_av (pTHX_ const char *name, int create)
		275	{
		276	#if PERL_VERSION_ATLEAST (5,9,0)
		277	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		278	get_av (name, create);
		279	#endif
		280	return get_av (name, create);
		281	}
		282
		283	static HV *
		284	coro_get_hv (pTHX_ const char *name, int create)
		285	{
		286	#if PERL_VERSION_ATLEAST (5,9,0)
		287	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		288	get_hv (name, create);
		289	#endif
		290	return get_hv (name, create);
		291	}
		292
		293	static AV *
		294	coro_clone_padlist (pTHX_ CV *cv)
		295	{
		296	AV *padlist = CvPADLIST (cv);
121	AV *newpadlist, *newpad_name, *newpad;	297	AV *newpadlist, *newpad;
122	SV **npad;
123
124	newpad_name = newAV ();
125	for (ix = fname; ix >= 0; ix--)
126	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
127
128	newpad = newAV ();
129	av_fill (newpad, AvFILLp (protopad));
130	npad = AvARRAY (newpad);
131		298
132	newpadlist = newAV ();	299	newpadlist = newAV ();
133	AvREAL_off (newpadlist);	300	AvREAL_off (newpadlist);
134	av_store (newpadlist, 0, (SV *) newpad_name);	301	#if PERL_VERSION_ATLEAST (5,9,0)
		302	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		303	#else
		304	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		305	#endif
		306	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		307	--AvFILLp (padlist);
		308
		309	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
135	av_store (newpadlist, 1, (SV *) newpad);	310	av_store (newpadlist, 1, (SV *)newpad);
136		311
137	av = newAV (); /* will be @_ */	312	return newpadlist;
138	av_extend (av, 0);	313	}
139	av_store (newpad, 0, (SV *) av);
140	AvFLAGS (av) = AVf_REIFY;
141		314
142	for (ix = fpad; ix > 0; ix--)	315	static void
		316	free_padlist (pTHX_ AV *padlist)
		317	{
		318	/* may be during global destruction */
		319	if (SvREFCNT (padlist))
143	{	320	{
144	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	321	I32 i = AvFILLp (padlist);
145	if (namesv && namesv != &PL_sv_undef)	322	while (i >= 0)
146	{	323	{
147	char *name = SvPVX (namesv); /* XXX */	324	SV **svp = av_fetch (padlist, i--, FALSE);
148	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	325	if (svp)
149	{ /* lexical from outside? */
150	npad[ix] = SvREFCNT_inc (ppad[ix]);
151	}	326	{
152	else
153	{ /* our own lexical */
154	SV *sv;	327	SV *sv;
155	if (*name == '&')	328	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
156	sv = SvREFCNT_inc (ppad[ix]);	329	SvREFCNT_dec (sv);
157	else if (*name == '@')	330
158	sv = (SV *) newAV ();	331	SvREFCNT_dec (*svp);
159	else if (*name == '%')
160	sv = (SV *) newHV ();
161	else
162	sv = NEWSV (0, 0);
163	if (!SvPADBUSY (sv))
164	SvPADMY_on (sv);
165	npad[ix] = sv;
166	}	332	}
167	}	333	}
168	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
169	{
170	npad[ix] = SvREFCNT_inc (ppad[ix]);
171	}
172	else
173	{
174	SV *sv = NEWSV (0, 0);
175	SvPADTMP_on (sv);
176	npad[ix] = sv;
177	}
178	}
179		334
180	#if 0 /* return -ENOTUNDERSTOOD */
181	/* Now that vars are all in place, clone nested closures. */
182
183	for (ix = fpad; ix > 0; ix--) {
184	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
185	if (namesv
186	&& namesv != &PL_sv_undef
187	&& !(SvFLAGS(namesv) & SVf_FAKE)
188	&& *SvPVX(namesv) == '&'
189	&& CvCLONE(ppad[ix]))
190	{
191	CV *kid = cv_clone((CV*)ppad[ix]);
192	SvREFCNT_dec(ppad[ix]);
193	CvCLONE_on(kid);
194	SvPADMY_on(kid);
195	npad[ix] = (SV*)kid;
196	}
197	}
198	#endif
199
200	return newpadlist;
201	}
202
203	#ifdef MAY_FLUSH
204	STATIC AV *
205	free_padlist (AV *padlist)
206	{
207	/* may be during global destruction */
208	if (SvREFCNT(padlist))
209	{
210	I32 i = AvFILLp(padlist);
211	while (i >= 0)
212	{
213	SV **svp = av_fetch(padlist, i--, FALSE);
214	SV *sv = svp ? *svp : Nullsv;
215	if (sv)
216	SvREFCNT_dec(sv);
217	}
218
219	SvREFCNT_dec((SV*)padlist);	335	SvREFCNT_dec ((SV*)padlist);
220	}	336	}
221	}	337	}
222	#endif	338
		339	static int
		340	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		341	{
		342	AV *padlist;
		343	AV *av = (AV *)mg->mg_obj;
		344
		345	/* casting is fun. */
		346	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		347	free_padlist (aTHX_ padlist);
		348
		349	return 0;
		350	}
		351
		352	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
		353	#define CORO_MAGIC_type_state PERL_MAGIC_ext
		354
		355	static MGVTBL coro_cv_vtbl = {
		356	0, 0, 0, 0,
		357	coro_cv_free
		358	};
		359
		360	#define CORO_MAGIC(sv,type) \
		361	SvMAGIC (sv) \
		362	? SvMAGIC (sv)->mg_type == type \
		363	? SvMAGIC (sv) \
		364	: mg_find (sv, type) \
		365	: 0
		366
		367	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
		368	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
		369
		370	static struct coro *
		371	SvSTATE_ (pTHX_ SV *coro)
		372	{
		373	HV *stash;
		374	MAGIC *mg;
		375
		376	if (SvROK (coro))
		377	coro = SvRV (coro);
		378
		379	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		380	croak ("Coro::State object required");
		381
		382	stash = SvSTASH (coro);
		383	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		384	{
		385	/* very slow, but rare, check */
		386	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		387	croak ("Coro::State object required");
		388	}
		389
		390	mg = CORO_MAGIC_state (coro);
		391	return (struct coro *)mg->mg_ptr;
		392	}
		393
		394	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
223		395
224	/* the next two functions merely cache the padlists */	396	/* the next two functions merely cache the padlists */
225	STATIC void	397	static void
226	get_padlist (CV *cv)	398	get_padlist (pTHX_ CV *cv)
227	{	399	{
228	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	400	MAGIC *mg = CORO_MAGIC_cv (cv);
		401	AV *av;
229		402
230	if (he && AvFILLp ((AV *)*he) >= 0)	403	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
231	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	404	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
232	else	405	else
233	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
234	}
235
236	STATIC void
237	put_padlist (CV *cv)
238	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
240
241	if (SvTYPE (*he) != SVt_PVAV)
242	{	406	{
		407	#if CORO_PREFER_PERL_FUNCTIONS
		408	/* this is probably cleaner, but also slower? */
		409	CV *cp = Perl_cv_clone (cv);
		410	CvPADLIST (cv) = CvPADLIST (cp);
		411	CvPADLIST (cp) = 0;
243	SvREFCNT_dec (*he);	412	SvREFCNT_dec (cp);
244	*he = (SV *)newAV ();	413	#else
		414	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		415	#endif
245	}	416	}
246
247	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
248	}	417	}
249
250	#ifdef MAY_FLUSH
251	STATIC void
252	flush_padlist_cache ()
253	{
254	HV *hv = padlist_cache;
255	padlist_cache = newHV ();
256
257	if (hv_iterinit (hv))
258	{
259	HE *he;
260	AV *padlist;
261
262	while (!!(he = hv_iternext (hv)))
263	{
264	AV *av = (AV *)HeVAL(he);
265
266	/* casting is fun. */
267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
268	free_padlist (padlist);
269	}
270	}
271
272	SvREFCNT_dec (hv);
273	}
274	#endif
275
276	#define SB do {
277	#define SE } while (0)
278
279	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
280	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
281
282	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
283		418
284	static void	419	static void
		420	put_padlist (pTHX_ CV *cv)
		421	{
		422	MAGIC *mg = CORO_MAGIC_cv (cv);
		423	AV *av;
		424
		425	if (expect_false (!mg))
		426	mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
		427
		428	av = (AV *)mg->mg_obj;
		429
		430	if (expect_false (AvFILLp (av) >= AvMAX (av)))
		431	av_extend (av, AvMAX (av) + 1);
		432
		433	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		434	}
		435
		436	/** load & save, init *******************************************************/
		437
		438	static void
285	load_state(pTHX_ Coro__State c)	439	load_perl (pTHX_ Coro__State c)
286	{	440	{
287	PL_dowarn = c->dowarn;	441	perl_slots *slot = c->slot;
		442	c->slot = 0;
288		443
289	PL_curstackinfo = c->curstackinfo;
290	PL_curstack = c->curstack;
291	PL_mainstack = c->mainstack;	444	PL_mainstack = c->mainstack;
292	PL_stack_sp = c->stack_sp;
293	PL_op = c->op;
294	PL_curpad = c->curpad;
295	PL_stack_base = c->stack_base;
296	PL_stack_max = c->stack_max;
297	PL_tmps_stack = c->tmps_stack;
298	PL_tmps_floor = c->tmps_floor;
299	PL_tmps_ix = c->tmps_ix;
300	PL_tmps_max = c->tmps_max;
301	PL_markstack = c->markstack;
302	PL_markstack_ptr = c->markstack_ptr;
303	PL_markstack_max = c->markstack_max;
304	PL_scopestack = c->scopestack;
305	PL_scopestack_ix = c->scopestack_ix;
306	PL_scopestack_max = c->scopestack_max;
307	PL_savestack = c->savestack;
308	PL_savestack_ix = c->savestack_ix;
309	PL_savestack_max = c->savestack_max;
310	PL_retstack = c->retstack;
311	PL_retstack_ix = c->retstack_ix;
312	PL_retstack_max = c->retstack_max;
313	PL_curcop = c->curcop;
314	PL_start_env = c->start_env;
315	PL_top_env = c->top_env;
316		445
317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	446	GvSV (PL_defgv) = slot->defsv;
318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	447	GvAV (PL_defgv) = slot->defav;
319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	448	GvSV (PL_errgv) = slot->errsv;
		449	GvSV (irsgv) = slot->irsgv;
		450
		451	#define VAR(name,type) PL_ ## name = slot->name;
		452	# include "state.h"
		453	#undef VAR
320		454
321	{	455	{
322	dSP;	456	dSP;
		457
323	CV *cv;	458	CV *cv;
324		459
325	/* now do the ugly restore mess */	460	/* now do the ugly restore mess */
326	while ((cv = (CV *)POPs))	461	while (expect_true (cv = (CV *)POPs))
327	{	462	{
328	AV *padlist = (AV *)POPs;
329
330	if (padlist)
331	{
332	put_padlist (cv); /* mark this padlist as available */	463	put_padlist (aTHX_ cv); /* mark this padlist as available */
333	CvPADLIST(cv) = padlist;	464	CvDEPTH (cv) = PTR2IV (POPs);
334	#ifdef USE_THREADS	465	CvPADLIST (cv) = (AV *)POPs;
335	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
336	#endif
337	}
338
339	++CvDEPTH(cv);
340	}	466	}
341		467
342	PUTBACK;	468	PUTBACK;
343	}	469	}
344	}	470	}
345		471
346	static void	472	static void
347	save_state(pTHX_ Coro__State c, int flags)	473	save_perl (pTHX_ Coro__State c)
348	{	474	{
349	{	475	{
350	dSP;	476	dSP;
351	I32 cxix = cxstack_ix;	477	I32 cxix = cxstack_ix;
352	PERL_CONTEXT *ccstk = cxstack;	478	PERL_CONTEXT *ccstk = cxstack;
…		…
355	/*	481	/*
356	* the worst thing you can imagine happens first - we have to save	482	* the worst thing you can imagine happens first - we have to save
357	* (and reinitialize) all cv's in the whole callchain :(	483	* (and reinitialize) all cv's in the whole callchain :(
358	*/	484	*/
359		485
360	PUSHs (Nullsv);	486	XPUSHs (Nullsv);
361	/* this loop was inspired by pp_caller */	487	/* this loop was inspired by pp_caller */
362	for (;;)	488	for (;;)
363	{	489	{
364	do	490	while (expect_true (cxix >= 0))
365	{	491	{
366	PERL_CONTEXT *cx = &ccstk[cxix--];	492	PERL_CONTEXT *cx = &ccstk[cxix--];
367		493
368	if (CxTYPE(cx) == CXt_SUB)	494	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
369	{	495	{
370	CV *cv = cx->blk_sub.cv;	496	CV *cv = cx->blk_sub.cv;
		497
371	if (CvDEPTH(cv))	498	if (expect_true (CvDEPTH (cv)))
372	{	499	{
373	#ifdef USE_THREADS
374	/*XPUSHs ((SV *)CvOWNER(cv));*/
375	/*CvOWNER(cv) = 0;*/
376	/*error must unlock this cv etc.. etc...*/
377	#endif
378	EXTEND (SP, CvDEPTH(cv)*2);	500	EXTEND (SP, 3);
379
380	while (--CvDEPTH(cv))
381	{
382	/* this tells the restore code to increment CvDEPTH */
383	PUSHs (Nullsv);
384	PUSHs ((SV *)cv);
385	}
386
387	PUSHs ((SV *)CvPADLIST(cv));	501	PUSHs ((SV *)CvPADLIST (cv));
		502	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
388	PUSHs ((SV *)cv);	503	PUSHs ((SV *)cv);
389		504
390	get_padlist (cv); /* this is a monster */	505	CvDEPTH (cv) = 0;
		506	get_padlist (aTHX_ cv);
391	}	507	}
392	}	508	}
393	else if (CxTYPE(cx) == CXt_FORMAT)
394	{
395	/* I never used formats, so how should I know how these are implemented? */
396	/* my bold guess is as a simple, plain sub... */
397	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
398	}
399	}	509	}
400	while (cxix >= 0);
401		510
402	if (top_si->si_type == PERLSI_MAIN)	511	if (expect_true (top_si->si_type == PERLSI_MAIN))
403	break;	512	break;
404		513
405	top_si = top_si->si_prev;	514	top_si = top_si->si_prev;
406	ccstk = top_si->si_cxstack;	515	ccstk = top_si->si_cxstack;
407	cxix = top_si->si_cxix;	516	cxix = top_si->si_cxix;
408	}	517	}
409		518
410	PUTBACK;	519	PUTBACK;
411	}	520	}
412		521
413	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	522	/* allocate some space on the context stack for our purposes */
414	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	523	/* we manually unroll here, as usually 2 slots is enough */
415	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	524	if (SLOT_COUNT >= 1) CXINC;
		525	if (SLOT_COUNT >= 2) CXINC;
		526	if (SLOT_COUNT >= 3) CXINC;
		527	{
		528	int i;
		529	for (i = 3; i < SLOT_COUNT; ++i)
		530	CXINC;
		531	}
		532	cxstack_ix -= SLOT_COUNT; /* undo allocation */
416		533
417	/* I have not the slightest idea of why av_reify is necessary */
418	/* but if it's missing the defav contents magically get replaced sometimes */
419	if (c->defav)
420	av_reify (c->defav);
421
422	c->dowarn = PL_dowarn;
423
424	c->curstackinfo = PL_curstackinfo;
425	c->curstack = PL_curstack;
426	c->mainstack = PL_mainstack;	534	c->mainstack = PL_mainstack;
427	c->stack_sp = PL_stack_sp;	535
428	c->op = PL_op;	536	{
429	c->curpad = PL_curpad;	537	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
430	c->stack_base = PL_stack_base;	538
431	c->stack_max = PL_stack_max;	539	slot->defav = GvAV (PL_defgv);
432	c->tmps_stack = PL_tmps_stack;	540	slot->defsv = DEFSV;
433	c->tmps_floor = PL_tmps_floor;	541	slot->errsv = ERRSV;
434	c->tmps_ix = PL_tmps_ix;	542	slot->irsgv = GvSV (irsgv);
435	c->tmps_max = PL_tmps_max;	543
436	c->markstack = PL_markstack;	544	#define VAR(name,type) slot->name = PL_ ## name;
437	c->markstack_ptr = PL_markstack_ptr;	545	# include "state.h"
438	c->markstack_max = PL_markstack_max;	546	#undef VAR
439	c->scopestack = PL_scopestack;	547	}
440	c->scopestack_ix = PL_scopestack_ix;
441	c->scopestack_max = PL_scopestack_max;
442	c->savestack = PL_savestack;
443	c->savestack_ix = PL_savestack_ix;
444	c->savestack_max = PL_savestack_max;
445	c->retstack = PL_retstack;
446	c->retstack_ix = PL_retstack_ix;
447	c->retstack_max = PL_retstack_max;
448	c->curcop = PL_curcop;
449	c->start_env = PL_start_env;
450	c->top_env = PL_top_env;
451	}	548	}
452		549
453	/*	550	/*
454	* allocate various perl stacks. This is an exact copy	551	* allocate various perl stacks. This is an exact copy
455	* of perl.c:init_stacks, except that it uses less memory	552	* of perl.c:init_stacks, except that it uses less memory
456	* on the assumption that coroutines do not usually need	553	* on the (sometimes correct) assumption that coroutines do
457	* a lot of stackspace.	554	* not usually need a lot of stackspace.
458	*/	555	*/
459	STATIC void	556	#if CORO_PREFER_PERL_FUNCTIONS
		557	# define coro_init_stacks init_stacks
		558	#else
		559	static void
460	coro_init_stacks (pTHX)	560	coro_init_stacks (pTHX)
461	{	561	{
462	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	562	PL_curstackinfo = new_stackinfo(32, 8);
463	PL_curstackinfo->si_type = PERLSI_MAIN;	563	PL_curstackinfo->si_type = PERLSI_MAIN;
464	PL_curstack = PL_curstackinfo->si_stack;	564	PL_curstack = PL_curstackinfo->si_stack;
465	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	565	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
466		566
467	PL_stack_base = AvARRAY(PL_curstack);	567	PL_stack_base = AvARRAY(PL_curstack);
468	PL_stack_sp = PL_stack_base;	568	PL_stack_sp = PL_stack_base;
469	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	569	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
470		570
471	New(50,PL_tmps_stack,96,SV*);	571	New(50,PL_tmps_stack,32,SV*);
472	PL_tmps_floor = -1;	572	PL_tmps_floor = -1;
473	PL_tmps_ix = -1;	573	PL_tmps_ix = -1;
474	PL_tmps_max = 96;	574	PL_tmps_max = 32;
475		575
476	New(54,PL_markstack,16,I32);	576	New(54,PL_markstack,16,I32);
477	PL_markstack_ptr = PL_markstack;	577	PL_markstack_ptr = PL_markstack;
478	PL_markstack_max = PL_markstack + 16;	578	PL_markstack_max = PL_markstack + 16;
479		579
		580	#ifdef SET_MARK_OFFSET
480	SET_MARK_OFFSET;	581	SET_MARK_OFFSET;
		582	#endif
481		583
482	New(54,PL_scopestack,16,I32);	584	New(54,PL_scopestack,8,I32);
483	PL_scopestack_ix = 0;	585	PL_scopestack_ix = 0;
484	PL_scopestack_max = 16;	586	PL_scopestack_max = 8;
485		587
486	New(54,PL_savestack,96,ANY);	588	New(54,PL_savestack,24,ANY);
487	PL_savestack_ix = 0;	589	PL_savestack_ix = 0;
488	PL_savestack_max = 96;	590	PL_savestack_max = 24;
489		591
		592	#if !PERL_VERSION_ATLEAST (5,9,0)
490	New(54,PL_retstack,8,OP*);	593	New(54,PL_retstack,4,OP*);
491	PL_retstack_ix = 0;	594	PL_retstack_ix = 0;
492	PL_retstack_max = 8;	595	PL_retstack_max = 4;
		596	#endif
493	}	597	}
		598	#endif
494		599
495	/*	600	/*
496	* destroy the stacks, the callchain etc...	601	* destroy the stacks, the callchain etc...
497	* still there is a memleak of 128 bytes...
498	*/	602	*/
499	STATIC void	603	static void
500	destroy_stacks(pTHX)	604	coro_destroy_stacks (pTHX)
501	{	605	{
502	/* is this ugly, I ask? */
503	while (PL_scopestack_ix)
504	LEAVE;
505
506	/* sure it is, but more important: is it correct?? :/ */
507	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
508	FREETMPS;
509
510	while (PL_curstackinfo->si_next)	606	while (PL_curstackinfo->si_next)
511	PL_curstackinfo = PL_curstackinfo->si_next;	607	PL_curstackinfo = PL_curstackinfo->si_next;
512		608
513	while (PL_curstackinfo)	609	while (PL_curstackinfo)
514	{	610	{
515	PERL_SI *p = PL_curstackinfo->si_prev;	611	PERL_SI *p = PL_curstackinfo->si_prev;
516		612
517	{	613	if (!IN_DESTRUCT)
518	dSP;
519	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
520	PUTBACK; /* possibly superfluous */
521	}
522
523	dounwind(-1);
524
525	SvREFCNT_dec(PL_curstackinfo->si_stack);	614	SvREFCNT_dec (PL_curstackinfo->si_stack);
		615
526	Safefree(PL_curstackinfo->si_cxstack);	616	Safefree (PL_curstackinfo->si_cxstack);
527	Safefree(PL_curstackinfo);	617	Safefree (PL_curstackinfo);
528	PL_curstackinfo = p;	618	PL_curstackinfo = p;
529	}	619	}
530		620
531	Safefree(PL_tmps_stack);	621	Safefree (PL_tmps_stack);
532	Safefree(PL_markstack);	622	Safefree (PL_markstack);
533	Safefree(PL_scopestack);	623	Safefree (PL_scopestack);
534	Safefree(PL_savestack);	624	Safefree (PL_savestack);
		625	#if !PERL_VERSION_ATLEAST (5,9,0)
535	Safefree(PL_retstack);	626	Safefree (PL_retstack);
		627	#endif
		628	}
		629
		630	static size_t
		631	coro_rss (pTHX_ struct coro *coro)
		632	{
		633	size_t rss = sizeof (*coro);
		634
		635	if (coro->mainstack)
		636	{
		637	perl_slots tmp_slot;
		638	perl_slots *slot;
		639
		640	if (coro->flags & CF_RUNNING)
		641	{
		642	slot = &tmp_slot;
		643
		644	#define VAR(name,type) slot->name = PL_ ## name;
		645	# include "state.h"
		646	#undef VAR
		647	}
		648	else
		649	slot = coro->slot;
		650
		651	rss += sizeof (slot->curstackinfo);
		652	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		653	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		654	rss += slot->tmps_max * sizeof (SV *);
		655	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		656	rss += slot->scopestack_max * sizeof (I32);
		657	rss += slot->savestack_max * sizeof (ANY);
		658
		659	#if !PERL_VERSION_ATLEAST (5,9,0)
		660	rss += slot->retstack_max * sizeof (OP *);
		661	#endif
		662	}
		663
		664	return rss;
		665	}
		666
		667	/** coroutine stack handling ************************************************/
		668
		669	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
		670	static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
		671
		672	/*
		673	* This overrides the default magic get method of %SIG elements.
		674	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
		675	* and instead of tryign to save and restore the hash elements, we just provide
		676	* readback here.
		677	* We only do this when the hook is != 0, as they are often set to 0 temporarily,
		678	* not expecting this to actually change the hook. This is a potential problem
		679	* when a schedule happens then, but we ignore this.
		680	*/
		681	static int
		682	coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
		683	{
		684	const char *s = MgPV_nolen_const (mg);
		685
		686	if (*s == '_')
		687	{
		688	if (strEQ (s, "__DIE__" ) && PL_diehook ) return sv_setsv (sv, PL_diehook ), 0;
		689	if (strEQ (s, "__WARN__") && PL_warnhook) return sv_setsv (sv, PL_warnhook), 0;
		690	}
		691
		692	return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
		693	}
		694
		695	static int
		696	coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
		697	{
		698	const char *s = MgPV_nolen_const (mg);
		699
		700	if (*s == '_')
		701	{
		702	SV **svp = 0;
		703
		704	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		705	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		706
		707	if (svp)
		708	{
		709	SV *old = *svp;
		710	*svp = newSVsv (sv);
		711	SvREFCNT_dec (old);
		712	return;
		713	}
		714	}
		715
		716	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
536	}	717	}
537		718
538	static void	719	static void
539	allocate_stack (Coro__State ctx, int alloc)	720	coro_setup (pTHX_ struct coro *coro)
540	{
541	coro_stack *stack;
542
543	New (0, stack, 1, coro_stack);
544
545	stack->refcnt = 1;
546	stack->usecnt = 1;
547	stack->gencnt = ctx->gencnt = 0;
548	if (alloc)
549	{
550	#ifdef HAVE_MMAP
551	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
552	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
553	if (stack->sptr == (void *)-1)
554	#endif
555	{
556	/*FIXME*//*D*//* reasonable stack size! */
557	stack->ssize = -4096 * sizeof (long);
558	New (0, stack->sptr, 4096, long);
559	}
560	}
561	else
562	stack->sptr = 0;
563
564	ctx->stack = stack;
565	}
566
567	static void
568	deallocate_stack (Coro__State ctx)
569	{
570	coro_stack *stack = ctx->stack;
571
572	ctx->stack = 0;
573
574	if (stack)
575	{
576	if (!--stack->refcnt)
577	{
578	#ifdef HAVE_MMAP
579	if (stack->ssize > 0 && stack->sptr)
580	munmap (stack->sptr, stack->ssize);
581	else
582	#else
583	Safefree (stack->sptr);
584	#endif
585	Safefree (stack);
586	}
587	else if (ctx->gencnt == stack->gencnt)
588	--stack->usecnt;
589	}
590	}
591
592	static void
593	setup_coro (void *arg)
594	{	721	{
595	/*	722	/*
596	* emulate part of the perl startup here.	723	* emulate part of the perl startup here.
597	*/	724	*/
598	dSP;
599	Coro__State ctx = (Coro__State)arg;
600	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
601
602	coro_init_stacks (aTHX);	725	coro_init_stacks (aTHX);
603	JMPENV_BOOTSTRAP;	726
		727	PL_runops = RUNOPS_DEFAULT;
		728	PL_curcop = &PL_compiling;
		729	PL_in_eval = EVAL_NULL;
		730	PL_comppad = 0;
		731	PL_curpm = 0;
		732	PL_curpad = 0;
		733	PL_localizing = 0;
		734	PL_dirty = 0;
		735	PL_restartop = 0;
		736
		737	/* recreate the die/warn hooks */
		738	PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
		739	PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
		740
		741	GvSV (PL_defgv) = newSV (0);
		742	GvAV (PL_defgv) = coro->args; coro->args = 0;
		743	GvSV (PL_errgv) = newSV (0);
		744	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		745	PL_rs = newSVsv (GvSV (irsgv));
		746	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		747
		748	{
		749	dSP;
		750	LOGOP myop;
		751
		752	Zero (&myop, 1, LOGOP);
		753	myop.op_next = Nullop;
		754	myop.op_flags = OPf_WANT_VOID;
		755
		756	PUSHMARK (SP);
		757	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		758	PUTBACK;
		759	PL_op = (OP *)&myop;
		760	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
604	SPAGAIN;	761	SPAGAIN;
		762	}
605		763
606	/*PL_curcop = 0;*/	764	/* this newly created coroutine might be run on an existing cctx which most
		765	* likely was suspended in set_stacklevel, called from entersub.
		766	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		767	* so we ENTER here for symmetry
		768	*/
		769	ENTER;
		770	}
		771
		772	static void
		773	coro_destroy (pTHX_ struct coro *coro)
		774	{
		775	if (!IN_DESTRUCT)
		776	{
		777	/* restore all saved variables and stuff */
		778	LEAVE_SCOPE (0);
		779	assert (PL_tmps_floor == -1);
		780
		781	/* free all temporaries */
		782	FREETMPS;
		783	assert (PL_tmps_ix == -1);
		784
		785	/* unwind all extra stacks */
		786	POPSTACK_TO (PL_mainstack);
		787
		788	/* unwind main stack */
		789	dounwind (-1);
		790	}
		791
		792	SvREFCNT_dec (GvSV (PL_defgv));
607	SvREFCNT_dec (GvAV (PL_defgv));	793	SvREFCNT_dec (GvAV (PL_defgv));
608	GvAV (PL_defgv) = ctx->args;	794	SvREFCNT_dec (GvSV (PL_errgv));
		795	SvREFCNT_dec (PL_defoutgv);
		796	SvREFCNT_dec (PL_rs);
		797	SvREFCNT_dec (GvSV (irsgv));
609		798
610	if (ctx->stack)	799	SvREFCNT_dec (PL_diehook);
611	{	800	SvREFCNT_dec (PL_warnhook);
612	ctx->cursp = 0;	801
		802	SvREFCNT_dec (coro->saved_deffh);
		803	SvREFCNT_dec (coro->throw);
613		804
614	PUSHMARK(SP);	805	coro_destroy_stacks (aTHX);
615	PUTBACK;
616	(void) call_sv (sub_init, G_VOID|G_NOARGS);
617	croak ("FATAL: CCTXT coroutine returned!");
618	}
619	else
620	{
621	UNOP myop;
622
623	PL_op = (OP *)&myop;
624
625	Zero(&myop, 1, UNOP);
626	myop.op_next = Nullop;
627	myop.op_flags = OPf_WANT_VOID;
628
629	PUSHMARK(SP);
630	XPUSHs (sub_init);
631	/*
632	* the next line is slightly wrong, as PL_op->op_next
633	* is actually being executed so we skip the first op.
634	* that doesn't matter, though, since it is only
635	* pp_nextstate and we never return...
636	* ah yes, and I don't care anyways ;)
637	*/
638	PUTBACK;
639	PL_op = pp_entersub();
640	SPAGAIN;
641
642	ENTER; /* necessary e.g. for dounwind */
643	}
644	}	806	}
645		807
646	static void	808	static void
647	continue_coro (void *arg)	809	free_coro_mortal (pTHX)
648	{	810	{
649	/*	811	if (expect_true (coro_mortal))
650	* this is a _very_ stripped down perl interpreter ;)	812	{
651	*/	813	SvREFCNT_dec (coro_mortal);
652	Coro__State ctx = (Coro__State)arg;	814	coro_mortal = 0;
653
654	ctx->cursp = 0;
655	PL_op = PL_op->op_next;
656	CALLRUNOPS(aTHX);
657	/*NORETURN*/
658	abort ();
659	}
660
661	STATIC void
662	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
663	{
664	dSP;
665	dSTACKLEVEL;
666
667	if (prev != next)
668	{	815	}
669	if (next->mainstack)	816	}
		817
		818	static int
		819	runops_trace (pTHX)
		820	{
		821	COP *oldcop = 0;
		822	int oldcxix = -2;
		823	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		824	coro_cctx *cctx = coro->cctx;
		825
		826	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		827	{
		828	PERL_ASYNC_CHECK ();
		829
		830	if (cctx->flags & CC_TRACE_ALL)
670	{	831	{
671	SAVE (prev, flags);	832	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
672	LOAD (next);
673
674	/* mark this state as in-use */
675	next->mainstack = 0;
676	next->tmps_ix = -2;
677
678	/* stacklevel changed? if yes, grab the stack for us! */
679	if (flags & TRANSFER_SAVE_CCTXT)
680	{	833	{
681	if (!prev->stack)	834	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
682	allocate_stack (prev, 0);	835	SV **bot, **top;
683	else if (prev->cursp != stacklevel	836	AV *av = newAV (); /* return values */
684	&& prev->stack->usecnt > 1)	837	SV **cb;
		838	dSP;
		839
		840	GV *gv = CvGV (cx->blk_sub.cv);
		841	SV *fullname = sv_2mortal (newSV (0));
		842	if (isGV (gv))
		843	gv_efullname3 (fullname, gv, 0);
		844
		845	bot = PL_stack_base + cx->blk_oldsp + 1;
		846	top = cx->blk_gimme == G_ARRAY ? SP + 1
		847	: cx->blk_gimme == G_SCALAR ? bot + 1
		848	: bot;
		849
		850	av_extend (av, top - bot);
		851	while (bot < top)
		852	av_push (av, SvREFCNT_inc (*bot++));
		853
		854	PL_runops = RUNOPS_DEFAULT;
		855	ENTER;
		856	SAVETMPS;
		857	EXTEND (SP, 3);
		858	PUSHMARK (SP);
		859	PUSHs (&PL_sv_no);
		860	PUSHs (fullname);
		861	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		862	PUTBACK;
		863	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		864	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		865	SPAGAIN;
		866	FREETMPS;
		867	LEAVE;
		868	PL_runops = runops_trace;
		869	}
		870
		871	if (oldcop != PL_curcop)
		872	{
		873	oldcop = PL_curcop;
		874
		875	if (PL_curcop != &PL_compiling)
685	{	876	{
686	prev->gencnt = ++prev->stack->gencnt;	877	SV **cb;
687	prev->stack->usecnt = 1;
688	}
689		878
690	/* has our stack been invalidated? */	879	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
691	if (next->stack && next->stack->gencnt != next->gencnt)
692	{	880	{
693	deallocate_stack (next);	881	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
694	allocate_stack (next, 1);	882
695	coro_create (&(next->stack->cctx),	883	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
696	continue_coro, (void *)next,	884	{
697	next->stack->sptr, labs (next->stack->ssize));	885	runops_proc_t old_runops = PL_runops;
		886	dSP;
		887	GV *gv = CvGV (cx->blk_sub.cv);
		888	SV *fullname = sv_2mortal (newSV (0));
		889
		890	if (isGV (gv))
		891	gv_efullname3 (fullname, gv, 0);
		892
		893	PL_runops = RUNOPS_DEFAULT;
		894	ENTER;
		895	SAVETMPS;
		896	EXTEND (SP, 3);
		897	PUSHMARK (SP);
		898	PUSHs (&PL_sv_yes);
		899	PUSHs (fullname);
		900	PUSHs (cx->blk_sub.hasargs ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		901	PUTBACK;
		902	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		903	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		904	SPAGAIN;
		905	FREETMPS;
		906	LEAVE;
		907	PL_runops = runops_trace;
		908	}
		909
		910	oldcxix = cxstack_ix;
698	}	911	}
699		912
700	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));	913	if (cctx->flags & CC_TRACE_LINE)
701	}
702
703	}
704	else if (next->tmps_ix == -2)
705	croak ("tried to transfer to running coroutine");
706	else
707	{
708	SAVE (prev, -1); /* first get rid of the old state */
709
710	if (flags & TRANSFER_SAVE_CCTXT)
711	{
712	if (!prev->stack)
713	allocate_stack (prev, 0);
714
715	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
716	{	914	{
717	setup_coro (next);	915	dSP;
718		916
719	prev->stack->refcnt++;	917	PL_runops = RUNOPS_DEFAULT;
720	prev->stack->usecnt++;	918	ENTER;
721	next->stack = prev->stack;	919	SAVETMPS;
722	next->gencnt = prev->gencnt;	920	EXTEND (SP, 3);
		921	PL_runops = RUNOPS_DEFAULT;
		922	PUSHMARK (SP);
		923	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		924	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		925	PUTBACK;
		926	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		927	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		928	SPAGAIN;
		929	FREETMPS;
		930	LEAVE;
		931	PL_runops = runops_trace;
723	}	932	}
724	else
725	{
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	setup_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
731	}	933	}
732	}	934	}
733	else
734	setup_coro (next);
735	}	935	}
736	}	936	}
737		937
738	next->cursp = stacklevel;	938	TAINT_NOT;
		939	return 0;
739	}	940	}
740		941
		942	/* inject a fake call to Coro::State::_cctx_init into the execution */
		943	/* _cctx_init should be careful, as it could be called at almost any time */
		944	/* during execution of a perl program */
		945	static void NOINLINE
		946	cctx_prepare (pTHX_ coro_cctx *cctx)
		947	{
		948	dSP;
		949	LOGOP myop;
		950
		951	PL_top_env = &PL_start_env;
		952
		953	if (cctx->flags & CC_TRACE)
		954	PL_runops = runops_trace;
		955
		956	Zero (&myop, 1, LOGOP);
		957	myop.op_next = PL_op;
		958	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		959
		960	PUSHMARK (SP);
		961	EXTEND (SP, 2);
		962	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		963	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		964	PUTBACK;
		965	PL_op = (OP *)&myop;
		966	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		967	SPAGAIN;
		968	}
		969
		970	/*
		971	* this is a _very_ stripped down perl interpreter ;)
		972	*/
		973	static void
		974	cctx_run (void *arg)
		975	{
		976	dTHX;
		977
		978	/* cctx_run is the alternative tail of transfer(), so unlock here. */
		979	UNLOCK;
		980
		981	/* we now skip the entersub that lead to transfer() */
		982	PL_op = PL_op->op_next;
		983
		984	/* inject a fake subroutine call to cctx_init */
		985	cctx_prepare (aTHX_ (coro_cctx *)arg);
		986
		987	/* somebody or something will hit me for both perl_run and PL_restartop */
		988	PL_restartop = PL_op;
		989	perl_run (PL_curinterp);
		990
		991	/*
		992	* If perl-run returns we assume exit() was being called or the coro
		993	* fell off the end, which seems to be the only valid (non-bug)
		994	* reason for perl_run to return. We try to exit by jumping to the
		995	* bootstrap-time "top" top_env, as we cannot restore the "main"
		996	* coroutine as Coro has no such concept
		997	*/
		998	PL_top_env = main_top_env;
		999	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		1000	}
		1001
		1002	static coro_cctx *
		1003	cctx_new ()
		1004	{
		1005	coro_cctx *cctx;
		1006	void *stack_start;
		1007	size_t stack_size;
		1008
		1009	++cctx_count;
		1010
		1011	Newz (0, cctx, 1, coro_cctx);
		1012
		1013	#if HAVE_MMAP
		1014	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		1015	/* mmap supposedly does allocate-on-write for us */
		1016	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		1017
		1018	if (cctx->sptr != (void *)-1)
		1019	{
		1020	# if CORO_STACKGUARD
		1021	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		1022	# endif
		1023	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		1024	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		1025	cctx->flags |= CC_MAPPED;
		1026	}
		1027	else
		1028	#endif
		1029	{
		1030	cctx->ssize = coro_stacksize * (long)sizeof (long);
		1031	New (0, cctx->sptr, coro_stacksize, long);
		1032
		1033	if (!cctx->sptr)
		1034	{
		1035	perror ("FATAL: unable to allocate stack for coroutine");
		1036	_exit (EXIT_FAILURE);
		1037	}
		1038
		1039	stack_start = cctx->sptr;
		1040	stack_size = cctx->ssize;
		1041	}
		1042
		1043	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1044	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
		1045
		1046	return cctx;
		1047	}
		1048
		1049	static void
		1050	cctx_destroy (coro_cctx *cctx)
		1051	{
		1052	if (!cctx)
		1053	return;
		1054
		1055	--cctx_count;
		1056
		1057	#if CORO_USE_VALGRIND
		1058	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		1059	#endif
		1060
		1061	#if HAVE_MMAP
		1062	if (cctx->flags & CC_MAPPED)
		1063	munmap (cctx->sptr, cctx->ssize);
		1064	else
		1065	#endif
		1066	Safefree (cctx->sptr);
		1067
		1068	Safefree (cctx);
		1069	}
		1070
		1071	/* wether this cctx should be destructed */
		1072	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1073
		1074	static coro_cctx *
		1075	cctx_get (pTHX)
		1076	{
		1077	while (expect_true (cctx_first))
		1078	{
		1079	coro_cctx *cctx = cctx_first;
		1080	cctx_first = cctx->next;
		1081	--cctx_idle;
		1082
		1083	if (expect_true (!CCTX_EXPIRED (cctx)))
		1084	return cctx;
		1085
		1086	cctx_destroy (cctx);
		1087	}
		1088
		1089	return cctx_new ();
		1090	}
		1091
		1092	static void
		1093	cctx_put (coro_cctx *cctx)
		1094	{
		1095	/* free another cctx if overlimit */
		1096	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		1097	{
		1098	coro_cctx *first = cctx_first;
		1099	cctx_first = first->next;
		1100	--cctx_idle;
		1101
		1102	cctx_destroy (first);
		1103	}
		1104
		1105	++cctx_idle;
		1106	cctx->next = cctx_first;
		1107	cctx_first = cctx;
		1108	}
		1109
		1110	/** coroutine switching *****************************************************/
		1111
		1112	static void
		1113	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1114	{
		1115	if (expect_true (prev != next))
		1116	{
		1117	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1118	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1119
		1120	if (expect_false (next->flags & CF_RUNNING))
		1121	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1122
		1123	if (expect_false (next->flags & CF_DESTROYED))
		1124	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1125
		1126	if (
		1127	#if PERL_VERSION_ATLEAST (5,9,0)
		1128	expect_false (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
		1129	#else
		1130	expect_false (PL_lex_state != LEX_NOTPARSING)
		1131	#endif
		1132	)
		1133	croak ("Coro::State::transfer called while parsing, but this is not supported");
		1134	}
		1135	}
		1136
		1137	/* always use the TRANSFER macro */
		1138	static void NOINLINE
		1139	transfer (pTHX_ struct coro *prev, struct coro *next)
		1140	{
		1141	dSTACKLEVEL;
		1142	static volatile int has_throw;
		1143
		1144	/* sometimes transfer is only called to set idle_sp */
		1145	if (expect_false (!next))
		1146	{
		1147	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1148	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		1149	}
		1150	else if (expect_true (prev != next))
		1151	{
		1152	coro_cctx *prev__cctx;
		1153
		1154	if (expect_false (prev->flags & CF_NEW))
		1155	{
		1156	/* create a new empty context */
		1157	Newz (0, prev->cctx, 1, coro_cctx);
		1158	prev->flags &= ~CF_NEW;
		1159	prev->flags |= CF_RUNNING;
		1160	}
		1161
		1162	prev->flags &= ~CF_RUNNING;
		1163	next->flags |= CF_RUNNING;
		1164
		1165	LOCK;
		1166
		1167	/* first get rid of the old state */
		1168	save_perl (aTHX_ prev);
		1169
		1170	if (expect_false (next->flags & CF_NEW))
		1171	{
		1172	/* need to start coroutine */
		1173	next->flags &= ~CF_NEW;
		1174	/* setup coroutine call */
		1175	coro_setup (aTHX_ next);
		1176	}
		1177	else
		1178	load_perl (aTHX_ next);
		1179
		1180	prev__cctx = prev->cctx;
		1181
		1182	/* possibly "free" the cctx */
		1183	if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
		1184	{
		1185	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1186	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1187
		1188	prev->cctx = 0;
		1189
		1190	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1191	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1192	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1193	if (!next->cctx)
		1194	next->cctx = cctx_get (aTHX);
		1195
		1196	cctx_put (prev__cctx);
		1197	}
		1198
		1199	++next->usecount;
		1200
		1201	if (expect_true (!next->cctx))
		1202	next->cctx = cctx_get (aTHX);
		1203
		1204	has_throw = !!next->throw;
		1205
		1206	if (expect_false (prev__cctx != next->cctx))
		1207	{
		1208	prev__cctx->top_env = PL_top_env;
		1209	PL_top_env = next->cctx->top_env;
		1210	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1211	}
		1212
		1213	free_coro_mortal (aTHX);
		1214	UNLOCK;
		1215
		1216	if (expect_false (has_throw))
		1217	{
		1218	struct coro *coro = SvSTATE (coro_current);
		1219
		1220	if (coro->throw)
		1221	{
		1222	SV *exception = coro->throw;
		1223	coro->throw = 0;
		1224	sv_setsv (ERRSV, exception);
		1225	croak (0);
		1226	}
		1227	}
		1228	}
		1229	}
		1230
		1231	struct transfer_args
		1232	{
		1233	struct coro *prev, *next;
		1234	};
		1235
		1236	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1237	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1238
		1239	/** high level stuff ********************************************************/
		1240
		1241	static int
		1242	coro_state_destroy (pTHX_ struct coro *coro)
		1243	{
		1244	if (coro->flags & CF_DESTROYED)
		1245	return 0;
		1246
		1247	coro->flags |= CF_DESTROYED;
		1248
		1249	if (coro->flags & CF_READY)
		1250	{
		1251	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1252	/* alternative: look through all ready queues and remove the coro */
		1253	LOCK;
		1254	--coro_nready;
		1255	UNLOCK;
		1256	}
		1257	else
		1258	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
		1259
		1260	if (coro->mainstack && coro->mainstack != main_mainstack)
		1261	{
		1262	struct coro temp;
		1263
		1264	if (coro->flags & CF_RUNNING)
		1265	croak ("FATAL: tried to destroy currently running coroutine");
		1266
		1267	save_perl (aTHX_ &temp);
		1268	load_perl (aTHX_ coro);
		1269
		1270	coro_destroy (aTHX_ coro);
		1271
		1272	load_perl (aTHX_ &temp);
		1273
		1274	coro->slot = 0;
		1275	}
		1276
		1277	cctx_destroy (coro->cctx);
		1278	SvREFCNT_dec (coro->args);
		1279
		1280	if (coro->next) coro->next->prev = coro->prev;
		1281	if (coro->prev) coro->prev->next = coro->next;
		1282	if (coro == coro_first) coro_first = coro->next;
		1283
		1284	return 1;
		1285	}
		1286
		1287	static int
		1288	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1289	{
		1290	struct coro *coro = (struct coro *)mg->mg_ptr;
		1291	mg->mg_ptr = 0;
		1292
		1293	coro->hv = 0;
		1294
		1295	if (--coro->refcnt < 0)
		1296	{
		1297	coro_state_destroy (aTHX_ coro);
		1298	Safefree (coro);
		1299	}
		1300
		1301	return 0;
		1302	}
		1303
		1304	static int
		1305	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1306	{
		1307	struct coro *coro = (struct coro *)mg->mg_ptr;
		1308
		1309	++coro->refcnt;
		1310
		1311	return 0;
		1312	}
		1313
		1314	static MGVTBL coro_state_vtbl = {
		1315	0, 0, 0, 0,
		1316	coro_state_free,
		1317	0,
		1318	#ifdef MGf_DUP
		1319	coro_state_dup,
		1320	#else
		1321	# define MGf_DUP 0
		1322	#endif
		1323	};
		1324
		1325	static void
		1326	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1327	{
		1328	ta->prev = SvSTATE (prev_sv);
		1329	ta->next = SvSTATE (next_sv);
		1330	TRANSFER_CHECK (*ta);
		1331	}
		1332
		1333	static void
		1334	api_transfer (SV *prev_sv, SV *next_sv)
		1335	{
		1336	dTHX;
		1337	struct transfer_args ta;
		1338
		1339	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1340	TRANSFER (ta);
		1341	}
		1342
		1343	/** Coro ********************************************************************/
		1344
		1345	static void
		1346	coro_enq (pTHX_ SV *coro_sv)
		1347	{
		1348	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		1349	}
		1350
		1351	static SV *
		1352	coro_deq (pTHX)
		1353	{
		1354	int prio;
		1355
		1356	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
		1357	if (AvFILLp (coro_ready [prio]) >= 0)
		1358	return av_shift (coro_ready [prio]);
		1359
		1360	return 0;
		1361	}
		1362
		1363	static int
		1364	api_ready (SV *coro_sv)
		1365	{
		1366	dTHX;
		1367	struct coro *coro;
		1368
		1369	if (SvROK (coro_sv))
		1370	coro_sv = SvRV (coro_sv);
		1371
		1372	coro = SvSTATE (coro_sv);
		1373
		1374	if (coro->flags & CF_READY)
		1375	return 0;
		1376
		1377	coro->flags |= CF_READY;
		1378
		1379	LOCK;
		1380	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1381	++coro_nready;
		1382	UNLOCK;
		1383
		1384	return 1;
		1385	}
		1386
		1387	static int
		1388	api_is_ready (SV *coro_sv)
		1389	{
		1390	dTHX;
		1391	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1392	}
		1393
		1394	static void
		1395	prepare_schedule (pTHX_ struct transfer_args *ta)
		1396	{
		1397	SV *prev_sv, *next_sv;
		1398
		1399	for (;;)
		1400	{
		1401	LOCK;
		1402	next_sv = coro_deq (aTHX);
		1403
		1404	/* nothing to schedule: call the idle handler */
		1405	if (expect_false (!next_sv))
		1406	{
		1407	dSP;
		1408	UNLOCK;
		1409
		1410	ENTER;
		1411	SAVETMPS;
		1412
		1413	PUSHMARK (SP);
		1414	PUTBACK;
		1415	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1416	SPAGAIN;
		1417
		1418	FREETMPS;
		1419	LEAVE;
		1420	continue;
		1421	}
		1422
		1423	ta->next = SvSTATE (next_sv);
		1424
		1425	/* cannot transfer to destroyed coros, skip and look for next */
		1426	if (expect_false (ta->next->flags & CF_DESTROYED))
		1427	{
		1428	UNLOCK;
		1429	SvREFCNT_dec (next_sv);
		1430	/* coro_nready is already taken care of by destroy */
		1431	continue;
		1432	}
		1433
		1434	--coro_nready;
		1435	UNLOCK;
		1436	break;
		1437	}
		1438
		1439	/* free this only after the transfer */
		1440	prev_sv = SvRV (coro_current);
		1441	ta->prev = SvSTATE (prev_sv);
		1442	TRANSFER_CHECK (*ta);
		1443	assert (ta->next->flags & CF_READY);
		1444	ta->next->flags &= ~CF_READY;
		1445	SvRV_set (coro_current, next_sv);
		1446
		1447	LOCK;
		1448	free_coro_mortal (aTHX);
		1449	coro_mortal = prev_sv;
		1450	UNLOCK;
		1451	}
		1452
		1453	static void
		1454	prepare_cede (pTHX_ struct transfer_args *ta)
		1455	{
		1456	api_ready (coro_current);
		1457	prepare_schedule (aTHX_ ta);
		1458	}
		1459
		1460	static int
		1461	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1462	{
		1463	if (coro_nready)
		1464	{
		1465	SV *prev = SvRV (coro_current);
		1466	prepare_schedule (aTHX_ ta);
		1467	api_ready (prev);
		1468	return 1;
		1469	}
		1470	else
		1471	return 0;
		1472	}
		1473
		1474	static void
		1475	api_schedule (void)
		1476	{
		1477	dTHX;
		1478	struct transfer_args ta;
		1479
		1480	prepare_schedule (aTHX_ &ta);
		1481	TRANSFER (ta);
		1482	}
		1483
		1484	static int
		1485	api_cede (void)
		1486	{
		1487	dTHX;
		1488	struct transfer_args ta;
		1489
		1490	prepare_cede (aTHX_ &ta);
		1491
		1492	if (expect_true (ta.prev != ta.next))
		1493	{
		1494	TRANSFER (ta);
		1495	return 1;
		1496	}
		1497	else
		1498	return 0;
		1499	}
		1500
		1501	static int
		1502	api_cede_notself (void)
		1503	{
		1504	dTHX;
		1505	struct transfer_args ta;
		1506
		1507	if (prepare_cede_notself (aTHX_ &ta))
		1508	{
		1509	TRANSFER (ta);
		1510	return 1;
		1511	}
		1512	else
		1513	return 0;
		1514	}
		1515
		1516	static void
		1517	api_trace (SV *coro_sv, int flags)
		1518	{
		1519	dTHX;
		1520	struct coro *coro = SvSTATE (coro_sv);
		1521
		1522	if (flags & CC_TRACE)
		1523	{
		1524	if (!coro->cctx)
		1525	coro->cctx = cctx_new ();
		1526	else if (!(coro->cctx->flags & CC_TRACE))
		1527	croak ("cannot enable tracing on coroutine with custom stack");
		1528
		1529	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1530	}
		1531	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1532	{
		1533	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1534
		1535	if (coro->flags & CF_RUNNING)
		1536	PL_runops = RUNOPS_DEFAULT;
		1537	else
		1538	coro->slot->runops = RUNOPS_DEFAULT;
		1539	}
		1540	}
		1541
741	MODULE = Coro::State PACKAGE = Coro::State	1542	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
742		1543
743	PROTOTYPES: ENABLE	1544	PROTOTYPES: DISABLE
744		1545
745	BOOT:	1546	BOOT:
746	{ /* {} necessary for stoopid perl-5.6.x */	1547	{
747	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1548	#ifdef USE_ITHREADS
748	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1549	MUTEX_INIT (&coro_mutex);
		1550	#endif
		1551	BOOT_PAGESIZE;
		1552
		1553	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1554	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1555
		1556	orig_sigelem_get = PL_vtbl_sigelem.svt_get;
		1557	PL_vtbl_sigelem.svt_get = coro_sigelem_get;
		1558	orig_sigelem_set = PL_vtbl_sigelem.svt_set;
		1559	PL_vtbl_sigelem.svt_set = coro_sigelem_set;
		1560
		1561	hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
		1562	rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
		1563	rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
		1564
749	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1565	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
750		1566
751	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1567	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
752	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1568	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
753	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1569	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
754	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1570	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
755
756	if (!padlist_cache)
757	padlist_cache = newHV ();
758		1571
759	main_mainstack = PL_mainstack;	1572	main_mainstack = PL_mainstack;
760	}	1573	main_top_env = PL_top_env;
761		1574
762	Coro::State	1575	while (main_top_env->je_prev)
763	_newprocess(args)	1576	main_top_env = main_top_env->je_prev;
764	SV * args	1577
765	PROTOTYPE: $	1578	coroapi.ver = CORO_API_VERSION;
		1579	coroapi.rev = CORO_API_REVISION;
		1580	coroapi.transfer = api_transfer;
		1581
		1582	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1583	}
		1584
		1585	SV *
		1586	new (char *klass, ...)
766	CODE:	1587	CODE:
767	Coro__State coro;	1588	{
		1589	struct coro *coro;
		1590	MAGIC *mg;
		1591	HV *hv;
		1592	int i;
768		1593
769	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
770	croak ("Coro::State::_newprocess expects an arrayref");
771
772	New (0, coro, 1, struct coro);	1594	Newz (0, coro, 1, struct coro);
		1595	coro->args = newAV ();
		1596	coro->flags = CF_NEW;
773		1597
774	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1598	if (coro_first) coro_first->prev = coro;
775	coro->mainstack = 0; /* actual work is done inside transfer */	1599	coro->next = coro_first;
776	coro->stack = 0;	1600	coro_first = coro;
777		1601
778	RETVAL = coro;	1602	coro->hv = hv = newHV ();
		1603	mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
		1604	mg->mg_flags |= MGf_DUP;
		1605	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1606
		1607	av_extend (coro->args, items - 1);
		1608	for (i = 1; i < items; i++)
		1609	av_push (coro->args, newSVsv (ST (i)));
		1610	}
779	OUTPUT:	1611	OUTPUT:
780	RETVAL	1612	RETVAL
781		1613
		1614	# these not obviously related functions are all rolled into the same xs
		1615	# function to increase chances that they all will call transfer with the same
		1616	# stack offset
782	void	1617	void
783	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1618	_set_stacklevel (...)
784	Coro::State_or_hashref prev	1619	ALIAS:
785	Coro::State_or_hashref next	1620	Coro::State::transfer = 1
786	int flags	1621	Coro::schedule = 2
787	PROTOTYPE: @	1622	Coro::cede = 3
		1623	Coro::cede_notself = 4
788	CODE:	1624	CODE:
789	transfer (aTHX_ prev, next, flags);	1625	{
		1626	struct transfer_args ta;
		1627
		1628	PUTBACK;
		1629	switch (ix)
		1630	{
		1631	case 0:
		1632	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1633	ta.next = 0;
		1634	break;
		1635
		1636	case 1:
		1637	if (items != 2)
		1638	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1639
		1640	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1641	break;
		1642
		1643	case 2:
		1644	prepare_schedule (aTHX_ &ta);
		1645	break;
		1646
		1647	case 3:
		1648	prepare_cede (aTHX_ &ta);
		1649	break;
		1650
		1651	case 4:
		1652	if (!prepare_cede_notself (aTHX_ &ta))
		1653	XSRETURN_EMPTY;
		1654
		1655	break;
		1656	}
		1657	SPAGAIN;
		1658
		1659	BARRIER;
		1660	PUTBACK;
		1661	TRANSFER (ta);
		1662	SPAGAIN; /* might be the sp of a different coroutine now */
		1663	/* be extra careful not to ever do anything after TRANSFER */
		1664	}
		1665
		1666	bool
		1667	_destroy (SV *coro_sv)
		1668	CODE:
		1669	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1670	OUTPUT:
		1671	RETVAL
790		1672
791	void	1673	void
792	DESTROY(coro)	1674	_exit (code)
793	Coro::State coro	1675	int code
794	CODE:	1676	PROTOTYPE: $
		1677	CODE:
		1678	_exit (code);
795		1679
796	if (coro->mainstack && coro->mainstack != main_mainstack)	1680	int
		1681	cctx_stacksize (int new_stacksize = 0)
		1682	CODE:
		1683	RETVAL = coro_stacksize;
		1684	if (new_stacksize)
		1685	coro_stacksize = new_stacksize;
		1686	OUTPUT:
		1687	RETVAL
		1688
		1689	int
		1690	cctx_count ()
		1691	CODE:
		1692	RETVAL = cctx_count;
		1693	OUTPUT:
		1694	RETVAL
		1695
		1696	int
		1697	cctx_idle ()
		1698	CODE:
		1699	RETVAL = cctx_idle;
		1700	OUTPUT:
		1701	RETVAL
		1702
		1703	void
		1704	list ()
		1705	PPCODE:
		1706	{
		1707	struct coro *coro;
		1708	for (coro = coro_first; coro; coro = coro->next)
		1709	if (coro->hv)
		1710	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1711	}
		1712
		1713	void
		1714	call (Coro::State coro, SV *coderef)
		1715	ALIAS:
		1716	eval = 1
		1717	CODE:
		1718	{
		1719	if (coro->mainstack)
797	{	1720	{
798	struct coro temp;	1721	struct coro temp;
799		1722
800	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1723	if (!(coro->flags & CF_RUNNING))
801	LOAD(aTHX_ coro);	1724	{
		1725	PUTBACK;
		1726	save_perl (aTHX_ &temp);
		1727	load_perl (aTHX_ coro);
		1728	}
802		1729
803	destroy_stacks (aTHX);	1730	{
		1731	dSP;
		1732	ENTER;
		1733	SAVETMPS;
		1734	PUTBACK;
		1735	PUSHSTACK;
		1736	PUSHMARK (SP);
804		1737
805	LOAD((&temp)); /* this will get rid of defsv etc.. */	1738	if (ix)
		1739	eval_sv (coderef, 0);
		1740	else
		1741	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
806		1742
807	coro->mainstack = 0;	1743	POPSTACK;
		1744	SPAGAIN;
		1745	FREETMPS;
		1746	LEAVE;
		1747	PUTBACK;
		1748	}
		1749
		1750	if (!(coro->flags & CF_RUNNING))
		1751	{
		1752	save_perl (aTHX_ coro);
		1753	load_perl (aTHX_ &temp);
		1754	SPAGAIN;
		1755	}
808	}	1756	}
		1757	}
809		1758
810	deallocate_stack (coro);	1759	SV *
811		1760	is_ready (Coro::State coro)
812	Safefree (coro);	1761	PROTOTYPE: $
		1762	ALIAS:
		1763	is_ready = CF_READY
		1764	is_running = CF_RUNNING
		1765	is_new = CF_NEW
		1766	is_destroyed = CF_DESTROYED
		1767	CODE:
		1768	RETVAL = boolSV (coro->flags & ix);
		1769	OUTPUT:
		1770	RETVAL
813		1771
814	void	1772	void
815	flush()	1773	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1774
		1775	SV *
		1776	has_stack (Coro::State coro)
		1777	PROTOTYPE: $
816	CODE:	1778	CODE:
817	#ifdef MAY_FLUSH	1779	RETVAL = boolSV (!!coro->cctx);
818	flush_padlist_cache ();	1780	OUTPUT:
819	#endif	1781	RETVAL
820		1782
		1783	int
		1784	is_traced (Coro::State coro)
		1785	PROTOTYPE: $
		1786	CODE:
		1787	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1788	OUTPUT:
		1789	RETVAL
		1790
		1791	IV
		1792	rss (Coro::State coro)
		1793	PROTOTYPE: $
		1794	ALIAS:
		1795	usecount = 1
		1796	CODE:
		1797	switch (ix)
		1798	{
		1799	case 0: RETVAL = coro_rss (aTHX_ coro); break;
		1800	case 1: RETVAL = coro->usecount; break;
		1801	}
		1802	OUTPUT:
		1803	RETVAL
		1804
		1805
821	MODULE = Coro::State PACKAGE = Coro::Cont	1806	MODULE = Coro::State PACKAGE = Coro
822		1807
823	# this is slightly dirty	1808	BOOT:
		1809	{
		1810	int i;
		1811
		1812	sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
		1813	sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
		1814	av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
		1815
		1816	coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
		1817	SvREADONLY_on (coro_current);
		1818
		1819	coro_stash = gv_stashpv ("Coro", TRUE);
		1820
		1821	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1822	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1823	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1824	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1825	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1826	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1827
		1828	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1829	coro_ready[i] = newAV ();
		1830
		1831	{
		1832	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1833	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
		1834
		1835	coroapi.schedule = api_schedule;
		1836	coroapi.cede = api_cede;
		1837	coroapi.cede_notself = api_cede_notself;
		1838	coroapi.ready = api_ready;
		1839	coroapi.is_ready = api_is_ready;
		1840	coroapi.nready = &coro_nready;
		1841	coroapi.current = coro_current;
		1842
		1843	GCoroAPI = &coroapi;
		1844	sv_setiv (sv, (IV)&coroapi);
		1845	SvREADONLY_on (sv);
		1846	}
		1847	}
824		1848
825	void	1849	void
826	yield(...)	1850	_set_current (SV *current)
827	PROTOTYPE: @	1851	PROTOTYPE: $
		1852	CODE:
		1853	SvREFCNT_dec (SvRV (coro_current));
		1854	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1855
		1856	int
		1857	prio (Coro::State coro, int newprio = 0)
		1858	ALIAS:
		1859	nice = 1
828	CODE:	1860	CODE:
829	static SV *returnstk;	1861	{
830	SV *sv;	1862	RETVAL = coro->prio;
		1863
		1864	if (items > 1)
		1865	{
		1866	if (ix)
		1867	newprio = coro->prio - newprio;
		1868
		1869	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1870	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1871
		1872	coro->prio = newprio;
		1873	}
		1874	}
		1875	OUTPUT:
		1876	RETVAL
		1877
		1878	SV *
		1879	ready (SV *self)
		1880	PROTOTYPE: $
		1881	CODE:
		1882	RETVAL = boolSV (api_ready (self));
		1883	OUTPUT:
		1884	RETVAL
		1885
		1886	int
		1887	nready (...)
		1888	PROTOTYPE:
		1889	CODE:
		1890	RETVAL = coro_nready;
		1891	OUTPUT:
		1892	RETVAL
		1893
		1894	void
		1895	throw (Coro::State self, SV *throw = &PL_sv_undef)
		1896	PROTOTYPE: $;$
		1897	CODE:
		1898	SvREFCNT_dec (self->throw);
		1899	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1900
		1901	# for async_pool speedup
		1902	void
		1903	_pool_1 (SV *cb)
		1904	CODE:
		1905	{
		1906	struct coro *coro = SvSTATE (coro_current);
		1907	HV *hv = (HV *)SvRV (coro_current);
831	AV *defav = GvAV (PL_defgv);	1908	AV *defav = GvAV (PL_defgv);
832	struct coro *prev, *next;	1909	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1910	AV *invoke_av;
		1911	int i, len;
833		1912
834	if (!returnstk)	1913	if (!invoke)
835	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1914	{
		1915	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1916	croak ("\3async_pool terminate\2\n");
		1917	}
836		1918
837	/* set up @_ -- ugly */	1919	SvREFCNT_dec (coro->saved_deffh);
838	av_clear (defav);	1920	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1921
		1922	hv_store (hv, "desc", sizeof ("desc") - 1,
		1923	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1924
		1925	invoke_av = (AV *)SvRV (invoke);
		1926	len = av_len (invoke_av);
		1927
		1928	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1929
		1930	if (len > 0)
		1931	{
839	av_fill (defav, items - 1);	1932	av_fill (defav, len - 1);
840	while (items--)	1933	for (i = 0; i < len; ++i)
841	av_store (defav, items, SvREFCNT_inc (ST(items)));	1934	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1935	}
842		1936
843	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
844	sv = av_pop ((AV *)SvRV (returnstk));
845	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
846	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
847	SvREFCNT_dec (sv);	1937	SvREFCNT_dec (invoke);
		1938	}
848		1939
849	transfer(aTHX_ prev, next, 0);	1940	void
		1941	_pool_2 (SV *cb)
		1942	CODE:
		1943	{
		1944	struct coro *coro = SvSTATE (coro_current);
850		1945
		1946	sv_setsv (cb, &PL_sv_undef);
		1947
		1948	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		1949	coro->saved_deffh = 0;
		1950
		1951	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1952	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1953	{
		1954	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1955	croak ("\3async_pool terminate\2\n");
		1956	}
		1957
		1958	av_clear (GvAV (PL_defgv));
		1959	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1960	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1961
		1962	coro->prio = 0;
		1963
		1964	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1965	api_trace (coro_current, 0);
		1966
		1967	av_push (av_async_pool, newSVsv (coro_current));
		1968	}
		1969
		1970
		1971	MODULE = Coro::State PACKAGE = Coro::AIO
		1972
		1973	SV *
		1974	_get_state ()
		1975	CODE:
		1976	{
		1977	struct io_state *data;
		1978
		1979	RETVAL = newSV (sizeof (struct io_state));
		1980	data = (struct io_state *)SvPVX (RETVAL);
		1981	SvCUR_set (RETVAL, sizeof (struct io_state));
		1982	SvPOK_only (RETVAL);
		1983
		1984	data->errorno = errno;
		1985	data->laststype = PL_laststype;
		1986	data->laststatval = PL_laststatval;
		1987	data->statcache = PL_statcache;
		1988	}
		1989	OUTPUT:
		1990	RETVAL
		1991
		1992	void
		1993	_set_state (char *data_)
		1994	PROTOTYPE: $
		1995	CODE:
		1996	{
		1997	struct io_state *data = (void *)data_;
		1998
		1999	errno = data->errorno;
		2000	PL_laststype = data->laststype;
		2001	PL_laststatval = data->laststatval;
		2002	PL_statcache = data->statcache;
		2003	}
		2004

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