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Comparing Coro/Coro/State.xs (file contents):
Revision 1.67 by root, Mon Dec 12 20:07:44 2005 UTC vs.
Revision 1.196 by root, Sat Oct 6 01:11:01 2007 UTC

		1	#include "libcoro/coro.c"
		2
1	#define PERL_NO_GET_CONTEXT	3	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"
4		4
5	#include "EXTERN.h"	5	#include "EXTERN.h"
6	#include "perl.h"	6	#include "perl.h"
7	#include "XSUB.h"	7	#include "XSUB.h"
8		8
9	#include "patchlevel.h"	9	#include "patchlevel.h"
10		10
11	// threaded perls might need much more, 65536 or more,	11	#include <stdio.h>
12	// which is 0.5 to 1MB	12	#include <errno.h>
13	#define STACKSIZE 16384	13	#include <assert.h>
14		14
15	#if PERL_VERSION < 6	15	#ifdef HAVE_MMAP
		16	# include <unistd.h>
		17	# include <sys/mman.h>
		18	# ifndef MAP_ANONYMOUS
		19	# ifdef MAP_ANON
		20	# define MAP_ANONYMOUS MAP_ANON
		21	# else
		22	# undef HAVE_MMAP
		23	# endif
		24	# endif
		25	# include <limits.h>
		26	# ifndef PAGESIZE
		27	# define PAGESIZE pagesize
		28	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		29	static long pagesize;
		30	# else
		31	# define BOOT_PAGESIZE (void)0
		32	# endif
		33	#else
		34	# define PAGESIZE 0
		35	# define BOOT_PAGESIZE (void)0
		36	#endif
		37
		38	#if CORO_USE_VALGRIND
		39	# include <valgrind/valgrind.h>
		40	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		41	#else
		42	# define REGISTER_STACK(cctx,start,end)
		43	#endif
		44
		45	/* the maximum number of idle cctx that will be pooled */
		46	#define MAX_IDLE_CCTX 8
		47
		48	#define PERL_VERSION_ATLEAST(a,b,c) \
		49	(PERL_REVISION > (a) \
		50	|| (PERL_REVISION == (a) \
		51	&& (PERL_VERSION > (b) \
		52	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		53
		54	#if !PERL_VERSION_ATLEAST (5,6,0)
16	# ifndef PL_ppaddr	55	# ifndef PL_ppaddr
17	# define PL_ppaddr ppaddr	56	# define PL_ppaddr ppaddr
18	# endif	57	# endif
19	# ifndef call_sv	58	# ifndef call_sv
20	# define call_sv perl_call_sv	59	# define call_sv perl_call_sv
…		…
31	# ifndef IS_PADCONST	70	# ifndef IS_PADCONST
32	# define IS_PADCONST(v) 0	71	# define IS_PADCONST(v) 0
33	# endif	72	# endif
34	#endif	73	#endif
35		74
36	#include <signal.h>	75	/* 5.8.7 */
37		76	#ifndef SvRV_set
38	#ifdef HAVE_MMAP	77	# define SvRV_set(s,v) SvRV(s) = (v)
39	# include <unistd.h>
40	# include <sys/mman.h>
41	# ifndef MAP_ANONYMOUS
42	# ifdef MAP_ANON
43	# define MAP_ANONYMOUS MAP_ANON
44	# else
45	# undef HAVE_MMAP
46	# endif
47	# endif	78	#endif
48	#endif
49		79
50	#define SUB_INIT "Coro::State::initialize"	80	/* 5.8.8 */
51	#define UCORO_STATE "_coro_state"	81	#ifndef GV_NOTQUAL
		82	# define GV_NOTQUAL 0
		83	#endif
		84	#ifndef newSV
		85	# define newSV(l) NEWSV(0,l)
		86	#endif
52		87
53	/* The next macro should declare a variable stacklevel that contains and approximation	88	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
54	* to the current C stack pointer. Its property is that it changes with each call	89	# undef CORO_STACKGUARD
55	* and should be unique. */	90	#endif
		91
		92	#ifndef CORO_STACKGUARD
		93	# define CORO_STACKGUARD 0
		94	#endif
		95
		96	/* prefer perl internal functions over our own? */
		97	#ifndef CORO_PREFER_PERL_FUNCTIONS
		98	# define CORO_PREFER_PERL_FUNCTIONS 0
		99	#endif
		100
		101	/* The next macros try to return the current stack pointer, in an as
		102	* portable way as possible. */
		103	#define dSTACKLEVEL volatile char stacklevel
56	#define dSTACKLEVEL void *stacklevel = &stacklevel	104	#define STACKLEVEL ((void *)&stacklevel)
57		105
58	#define IN_DESTRUCT (PL_main_cv == Nullcv)	106	#define IN_DESTRUCT (PL_main_cv == Nullcv)
59		107
60	#define labs(l) ((l) >= 0 ? (l) : -(l))	108	#if __GNUC__ >= 3
		109	# define attribute(x) __attribute__(x)
		110	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		111	# define expect(expr,value) __builtin_expect ((expr),(value))
		112	#else
		113	# define attribute(x)
		114	# define BARRIER
		115	# define expect(expr,value) (expr)
		116	#endif
		117
		118	#define expect_false(expr) expect ((expr) != 0, 0)
		119	#define expect_true(expr) expect ((expr) != 0, 1)
		120
		121	#define NOINLINE attribute ((noinline))
61		122
62	#include "CoroAPI.h"	123	#include "CoroAPI.h"
63		124
64	#ifdef USE_ITHREADS	125	#ifdef USE_ITHREADS
65	static perl_mutex coro_mutex;	126	static perl_mutex coro_mutex;
66	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	127	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
67	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	128	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
68	#else	129	#else
69	# define LOCK 0	130	# define LOCK (void)0
70	# define UNLOCK 0	131	# define UNLOCK (void)0
71	#endif	132	#endif
72		133
		134	/* helper storage struct for Coro::AIO */
		135	struct io_state
		136	{
		137	int errorno;
		138	I32 laststype;
		139	int laststatval;
		140	Stat_t statcache;
		141	};
		142
		143	static size_t coro_stacksize = CORO_STACKSIZE;
73	static struct CoroAPI coroapi;	144	static struct CoroAPI coroapi;
74	static AV *main_mainstack; /* used to differentiate between $main and others */	145	static AV *main_mainstack; /* used to differentiate between $main and others */
		146	static JMPENV *main_top_env;
75	static HV *coro_state_stash;	147	static HV *coro_state_stash, *coro_stash;
76	static SV *ucoro_state_sv;
77	static U32 ucoro_state_hash;
78	static SV *coro_mortal; /* will be freed after next transfer */	148	static SV *coro_mortal; /* will be freed after next transfer */
79		149
80	/* this is actually not only the c stack but also c registers etc... */	150	static GV *irsgv; /* $/ */
		151	static GV *stdoutgv; /* *STDOUT */
		152
		153	/* async_pool helper stuff */
		154	static SV *sv_pool_rss;
		155	static SV *sv_pool_size;
		156	static AV *av_async_pool;
		157
		158	static struct coro_cctx *cctx_first;
		159	static int cctx_count, cctx_idle;
		160
		161	enum {
		162	CC_MAPPED = 0x01,
		163	CC_NOREUSE = 0x02, /* throw this away after tracing */
		164	CC_TRACE = 0x04,
		165	CC_TRACE_SUB = 0x08, /* trace sub calls */
		166	CC_TRACE_LINE = 0x10, /* trace each statement */
		167	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		168	};
		169
		170	/* this is a structure representing a c-level coroutine */
81	typedef struct {	171	typedef struct coro_cctx {
82	int refcnt; /* pointer reference counter */	172	struct coro_cctx *next;
83	int usecnt; /* shared by how many coroutines */
84	int gencnt; /* generation counter */
85		173
		174	/* the stack */
		175	void *sptr;
		176	size_t ssize;
		177
		178	/* cpu state */
		179	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		180	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		181	JMPENV *top_env;
86	coro_context cctx;	182	coro_context cctx;
87		183
88	void *sptr;	184	#if CORO_USE_VALGRIND
89	long ssize; /* positive == mmap, otherwise malloc */	185	int valgrind_id;
90	} coro_stack;	186	#endif
		187	unsigned char flags;
		188	} coro_cctx;
91		189
		190	enum {
		191	CF_RUNNING = 0x0001, /* coroutine is running */
		192	CF_READY = 0x0002, /* coroutine is ready */
		193	CF_NEW = 0x0004, /* has never been switched to */
		194	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		195	};
		196
		197	/* this is a structure representing a perl-level coroutine */
92	struct coro {	198	struct coro {
93	/* the top-level JMPENV for each coroutine, needed to catch dies. */	199	/* the c coroutine allocated to this perl coroutine, if any */
94	JMPENV start_env;	200	coro_cctx *cctx;
95
96	/* the optional C context */
97	coro_stack *stack;
98	void *cursp;
99	int gencnt;
100
101	/* optionally saved, might be zero */
102	AV *defav;
103	SV *defsv;
104	SV *errsv;
105
106	/* saved global state not related to stacks */
107	U8 dowarn;
108	I32 in_eval;
109
110	/* the stacks and related info (callchain etc..) */
111	PERL_SI *curstackinfo;
112	AV *curstack;
113	AV *mainstack;
114	SV **stack_sp;
115	OP *op;
116	SV **curpad;
117	AV *comppad;
118	CV *compcv;
119	SV **stack_base;
120	SV **stack_max;
121	SV **tmps_stack;
122	I32 tmps_floor;
123	I32 tmps_ix;
124	I32 tmps_max;
125	I32 *markstack;
126	I32 *markstack_ptr;
127	I32 *markstack_max;
128	I32 *scopestack;
129	I32 scopestack_ix;
130	I32 scopestack_max;
131	ANY *savestack;
132	I32 savestack_ix;
133	I32 savestack_max;
134	OP **retstack;
135	I32 retstack_ix;
136	I32 retstack_max;
137	PMOP *curpm;
138	COP *curcop;
139	JMPENV *top_env;
140		201
141	/* data associated with this coroutine (initial args) */	202	/* data associated with this coroutine (initial args) */
142	AV *args;	203	AV *args;
		204	int refcnt;
		205	int flags; /* CF_ flags */
		206
		207	/* optionally saved, might be zero */
		208	AV *defav; /* @_ */
		209	SV *defsv; /* $_ */
		210	SV *errsv; /* $@ */
		211	SV *deffh; /* default filehandle */
		212	SV *irssv; /* $/ */
		213	SV *irssv_sv; /* real $/ cache */
		214
		215	#define VAR(name,type) type name;
		216	# include "state.h"
		217	#undef VAR
		218
		219	/* statistics */
		220	int usecount; /* number of transfers to this coro */
		221
		222	/* coro process data */
		223	int prio;
		224	SV *throw;
		225
		226	/* async_pool */
		227	SV *saved_deffh;
		228
		229	/* linked list */
		230	struct coro *next, *prev;
		231	HV *hv; /* the perl hash associated with this coro, if any */
143	};	232	};
144		233
145	typedef struct coro *Coro__State;	234	typedef struct coro *Coro__State;
146	typedef struct coro *Coro__State_or_hashref;	235	typedef struct coro *Coro__State_or_hashref;
147		236
148	/* mostly copied from op.c:cv_clone2 */	237	/** Coro ********************************************************************/
149	STATIC AV *	238
150	clone_padlist (pTHX_ AV *protopadlist)	239	#define PRIO_MAX 3
		240	#define PRIO_HIGH 1
		241	#define PRIO_NORMAL 0
		242	#define PRIO_LOW -1
		243	#define PRIO_IDLE -3
		244	#define PRIO_MIN -4
		245
		246	/* for Coro.pm */
		247	static SV *coro_current;
		248	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		249	static int coro_nready;
		250	static struct coro *coro_first;
		251
		252	/** lowlevel stuff **********************************************************/
		253
		254	static AV *
		255	coro_clone_padlist (pTHX_ CV *cv)
151	{	256	{
152	AV *av;	257	AV *padlist = CvPADLIST (cv);
153	I32 ix;
154	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
155	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
156	SV **pname = AvARRAY (protopad_name);
157	SV **ppad = AvARRAY (protopad);
158	I32 fname = AvFILLp (protopad_name);
159	I32 fpad = AvFILLp (protopad);
160	AV *newpadlist, *newpad_name, *newpad;	258	AV *newpadlist, *newpad;
161	SV **npad;
162
163	newpad_name = newAV ();
164	for (ix = fname; ix >= 0; ix--)
165	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
166
167	newpad = newAV ();
168	av_fill (newpad, AvFILLp (protopad));
169	npad = AvARRAY (newpad);
170		259
171	newpadlist = newAV ();	260	newpadlist = newAV ();
172	AvREAL_off (newpadlist);	261	AvREAL_off (newpadlist);
173	av_store (newpadlist, 0, (SV *) newpad_name);	262	#if PERL_VERSION_ATLEAST (5,9,0)
		263	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		264	#else
		265	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		266	#endif
		267	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		268	--AvFILLp (padlist);
		269
		270	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
174	av_store (newpadlist, 1, (SV *) newpad);	271	av_store (newpadlist, 1, (SV *)newpad);
175
176	av = newAV (); /* will be @_ */
177	av_extend (av, 0);
178	av_store (newpad, 0, (SV *) av);
179	AvFLAGS (av) = AVf_REIFY;
180
181	for (ix = fpad; ix > 0; ix--)
182	{
183	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
184
185	if (namesv && namesv != &PL_sv_undef)
186	{
187	char *name = SvPVX (namesv); /* XXX */
188
189	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
190	{ /* lexical from outside? */
191	npad[ix] = SvREFCNT_inc (ppad[ix]);
192	}
193	else
194	{ /* our own lexical */
195	SV *sv;
196	if (*name == '&')
197	sv = SvREFCNT_inc (ppad[ix]);
198	else if (*name == '@')
199	sv = (SV *) newAV ();
200	else if (*name == '%')
201	sv = (SV *) newHV ();
202	else
203	sv = NEWSV (0, 0);
204
205	#ifdef SvPADBUSY
206	if (!SvPADBUSY (sv))
207	#endif
208	SvPADMY_on (sv);
209
210	npad[ix] = sv;
211	}
212	}
213	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
214	{
215	npad[ix] = SvREFCNT_inc (ppad[ix]);
216	}
217	else
218	{
219	SV *sv = NEWSV (0, 0);
220	SvPADTMP_on (sv);
221	npad[ix] = sv;
222	}
223	}
224
225	#if 0 /* return -ENOTUNDERSTOOD */
226	/* Now that vars are all in place, clone nested closures. */
227
228	for (ix = fpad; ix > 0; ix--) {
229	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
230	if (namesv
231	&& namesv != &PL_sv_undef
232	&& !(SvFLAGS(namesv) & SVf_FAKE)
233	&& *SvPVX(namesv) == '&'
234	&& CvCLONE(ppad[ix]))
235	{
236	CV *kid = cv_clone((CV*)ppad[ix]);
237	SvREFCNT_dec(ppad[ix]);
238	CvCLONE_on(kid);
239	SvPADMY_on(kid);
240	npad[ix] = (SV*)kid;
241	}
242	}
243	#endif
244		272
245	return newpadlist;	273	return newpadlist;
246	}	274	}
247		275
248	STATIC void	276	static void
249	free_padlist (pTHX_ AV *padlist)	277	free_padlist (pTHX_ AV *padlist)
250	{	278	{
251	/* may be during global destruction */	279	/* may be during global destruction */
252	if (SvREFCNT (padlist))	280	if (SvREFCNT (padlist))
253	{	281	{
…		…
267		295
268	SvREFCNT_dec ((SV*)padlist);	296	SvREFCNT_dec ((SV*)padlist);
269	}	297	}
270	}	298	}
271		299
272	STATIC int	300	static int
273	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)	301	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
274	{	302	{
275	AV *padlist;	303	AV *padlist;
276	AV *av = (AV *)mg->mg_obj;	304	AV *av = (AV *)mg->mg_obj;
277		305
278	/* casting is fun. */	306	/* casting is fun. */
279	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	307	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
280	free_padlist (aTHX_ padlist);	308	free_padlist (aTHX_ padlist);
281		309
282	SvREFCNT_dec (av);	310	SvREFCNT_dec (av);
		311
		312	return 0;
283	}	313	}
284		314
285	#define PERL_MAGIC_coro PERL_MAGIC_ext	315	#define PERL_MAGIC_coro PERL_MAGIC_ext
286		316
287	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	317	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
288		318
		319	#define CORO_MAGIC(cv) \
		320	SvMAGIC (cv) \
		321	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		322	? SvMAGIC (cv) \
		323	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		324	: 0
		325
		326	static struct coro *
		327	SvSTATE_ (pTHX_ SV *coro)
		328	{
		329	HV *stash;
		330	MAGIC *mg;
		331
		332	if (SvROK (coro))
		333	coro = SvRV (coro);
		334
		335	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		336	croak ("Coro::State object required");
		337
		338	stash = SvSTASH (coro);
		339	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		340	{
		341	/* very slow, but rare, check */
		342	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		343	croak ("Coro::State object required");
		344	}
		345
		346	mg = CORO_MAGIC (coro);
		347	return (struct coro *)mg->mg_ptr;
		348	}
		349
		350	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		351
289	/* the next two functions merely cache the padlists */	352	/* the next two functions merely cache the padlists */
290	STATIC void	353	static void
291	get_padlist (pTHX_ CV *cv)	354	get_padlist (pTHX_ CV *cv)
292	{	355	{
293	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	356	MAGIC *mg = CORO_MAGIC (cv);
		357	AV *av;
294		358
295	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	359	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
296	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	360	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
297	else	361	else
		362	{
		363	#if CORO_PREFER_PERL_FUNCTIONS
		364	/* this is probably cleaner, but also slower? */
		365	CV *cp = Perl_cv_clone (cv);
		366	CvPADLIST (cv) = CvPADLIST (cp);
		367	CvPADLIST (cp) = 0;
		368	SvREFCNT_dec (cp);
		369	#else
298	CvPADLIST (cv) = clone_padlist (aTHX_ CvPADLIST (cv));	370	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		371	#endif
		372	}
299	}	373	}
300		374
301	STATIC void	375	static void
302	put_padlist (pTHX_ CV *cv)	376	put_padlist (pTHX_ CV *cv)
303	{	377	{
304	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	378	MAGIC *mg = CORO_MAGIC (cv);
		379	AV *av;
305		380
306	if (!mg)	381	if (expect_false (!mg))
307	{	382	{
308	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	383	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
309	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	384	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
310	mg->mg_virtual = &vtbl_coro;	385	mg->mg_virtual = &vtbl_coro;
311	mg->mg_obj = (SV *)newAV ();	386	mg->mg_obj = (SV *)newAV ();
312	}	387	}
313		388
314	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	389	av = (AV *)mg->mg_obj;
315	}
316		390
317	#define SB do {	391	if (expect_false (AvFILLp (av) >= AvMAX (av)))
318	#define SE } while (0)	392	av_extend (av, AvMAX (av) + 1);
319		393
320	#define LOAD(state) load_state(aTHX_ (state));	394	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
321	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	395	}
322		396
323	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	397	/** load & save, init *******************************************************/
324		398
325	static void	399	static void
326	load_state(pTHX_ Coro__State c)	400	load_perl (pTHX_ Coro__State c)
327	{	401	{
328	PL_dowarn = c->dowarn;	402	#define VAR(name,type) PL_ ## name = c->name;
329	PL_in_eval = c->in_eval;	403	# include "state.h"
		404	#undef VAR
330		405
331	PL_curstackinfo = c->curstackinfo;	406	GvSV (PL_defgv) = c->defsv;
332	PL_curstack = c->curstack;	407	GvAV (PL_defgv) = c->defav;
333	PL_mainstack = c->mainstack;	408	GvSV (PL_errgv) = c->errsv;
334	PL_stack_sp = c->stack_sp;	409	GvSV (irsgv) = c->irssv_sv;
335	PL_op = c->op;
336	PL_curpad = c->curpad;
337	PL_comppad = c->comppad;
338	PL_compcv = c->compcv;
339	PL_stack_base = c->stack_base;
340	PL_stack_max = c->stack_max;
341	PL_tmps_stack = c->tmps_stack;
342	PL_tmps_floor = c->tmps_floor;
343	PL_tmps_ix = c->tmps_ix;
344	PL_tmps_max = c->tmps_max;
345	PL_markstack = c->markstack;
346	PL_markstack_ptr = c->markstack_ptr;
347	PL_markstack_max = c->markstack_max;
348	PL_scopestack = c->scopestack;
349	PL_scopestack_ix = c->scopestack_ix;
350	PL_scopestack_max = c->scopestack_max;
351	PL_savestack = c->savestack;
352	PL_savestack_ix = c->savestack_ix;
353	PL_savestack_max = c->savestack_max;
354	PL_retstack = c->retstack;
355	PL_retstack_ix = c->retstack_ix;
356	PL_retstack_max = c->retstack_max;
357	PL_curpm = c->curpm;
358	PL_curcop = c->curcop;
359	PL_top_env = c->top_env;
360
361	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
362	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
363	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
364		410
365	{	411	{
366	dSP;	412	dSP;
367	CV *cv;	413	CV *cv;
368		414
369	/* now do the ugly restore mess */	415	/* now do the ugly restore mess */
370	while ((cv = (CV *)POPs))	416	while (expect_true (cv = (CV *)POPs))
371	{	417	{
372	AV *padlist = (AV *)POPs;
373
374	if (padlist)
375	{
376	put_padlist (aTHX_ cv); /* mark this padlist as available */	418	put_padlist (aTHX_ cv); /* mark this padlist as available */
377	CvPADLIST(cv) = padlist;	419	CvDEPTH (cv) = PTR2IV (POPs);
378	}	420	CvPADLIST (cv) = (AV *)POPs;
379
380	++CvDEPTH(cv);
381	}	421	}
382		422
383	PUTBACK;	423	PUTBACK;
384	}	424	}
385	}	425	}
386		426
387	static void	427	static void
388	save_state(pTHX_ Coro__State c, int flags)	428	save_perl (pTHX_ Coro__State c)
389	{	429	{
390	{	430	{
391	dSP;	431	dSP;
392	I32 cxix = cxstack_ix;	432	I32 cxix = cxstack_ix;
393	PERL_CONTEXT *ccstk = cxstack;	433	PERL_CONTEXT *ccstk = cxstack;
…		…
396	/*	436	/*
397	* the worst thing you can imagine happens first - we have to save	437	* the worst thing you can imagine happens first - we have to save
398	* (and reinitialize) all cv's in the whole callchain :(	438	* (and reinitialize) all cv's in the whole callchain :(
399	*/	439	*/
400		440
401	PUSHs (Nullsv);	441	XPUSHs (Nullsv);
402	/* this loop was inspired by pp_caller */	442	/* this loop was inspired by pp_caller */
403	for (;;)	443	for (;;)
404	{	444	{
405	while (cxix >= 0)	445	while (expect_true (cxix >= 0))
406	{	446	{
407	PERL_CONTEXT *cx = &ccstk[cxix--];	447	PERL_CONTEXT *cx = &ccstk[cxix--];
408		448
409	if (CxTYPE(cx) == CXt_SUB)	449	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
410	{	450	{
411	CV *cv = cx->blk_sub.cv;	451	CV *cv = cx->blk_sub.cv;
		452
412	if (CvDEPTH(cv))	453	if (expect_true (CvDEPTH (cv)))
413	{	454	{
414	EXTEND (SP, CvDEPTH(cv)*2);	455	EXTEND (SP, 3);
415
416	while (--CvDEPTH(cv))
417	{
418	/* this tells the restore code to increment CvDEPTH */
419	PUSHs (Nullsv);
420	PUSHs ((SV *)cv);
421	}
422
423	PUSHs ((SV *)CvPADLIST(cv));	456	PUSHs ((SV *)CvPADLIST (cv));
		457	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
424	PUSHs ((SV *)cv);	458	PUSHs ((SV *)cv);
425		459
		460	CvDEPTH (cv) = 0;
426	get_padlist (aTHX_ cv); /* this is a monster */	461	get_padlist (aTHX_ cv);
427	}	462	}
428	}	463	}
429	#ifdef CXt_FORMAT
430	else if (CxTYPE(cx) == CXt_FORMAT)
431	{
432	/* I never used formats, so how should I know how these are implemented? */
433	/* my bold guess is as a simple, plain sub... */
434	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
435	}
436	#endif
437	}	464	}
438		465
439	if (top_si->si_type == PERLSI_MAIN)	466	if (expect_true (top_si->si_type == PERLSI_MAIN))
440	break;	467	break;
441		468
442	top_si = top_si->si_prev;	469	top_si = top_si->si_prev;
443	ccstk = top_si->si_cxstack;	470	ccstk = top_si->si_cxstack;
444	cxix = top_si->si_cxix;	471	cxix = top_si->si_cxix;
445	}	472	}
446		473
447	PUTBACK;	474	PUTBACK;
448	}	475	}
449		476
450	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	477	c->defav = GvAV (PL_defgv);
451	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	478	c->defsv = DEFSV;
452	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	479	c->errsv = ERRSV;
		480	c->irssv_sv = GvSV (irsgv);
453		481
454	c->dowarn = PL_dowarn;	482	#define VAR(name,type)c->name = PL_ ## name;
455	c->in_eval = PL_in_eval;	483	# include "state.h"
456		484	#undef VAR
457	c->curstackinfo = PL_curstackinfo;
458	c->curstack = PL_curstack;
459	c->mainstack = PL_mainstack;
460	c->stack_sp = PL_stack_sp;
461	c->op = PL_op;
462	c->curpad = PL_curpad;
463	c->comppad = PL_comppad;
464	c->compcv = PL_compcv;
465	c->stack_base = PL_stack_base;
466	c->stack_max = PL_stack_max;
467	c->tmps_stack = PL_tmps_stack;
468	c->tmps_floor = PL_tmps_floor;
469	c->tmps_ix = PL_tmps_ix;
470	c->tmps_max = PL_tmps_max;
471	c->markstack = PL_markstack;
472	c->markstack_ptr = PL_markstack_ptr;
473	c->markstack_max = PL_markstack_max;
474	c->scopestack = PL_scopestack;
475	c->scopestack_ix = PL_scopestack_ix;
476	c->scopestack_max = PL_scopestack_max;
477	c->savestack = PL_savestack;
478	c->savestack_ix = PL_savestack_ix;
479	c->savestack_max = PL_savestack_max;
480	c->retstack = PL_retstack;
481	c->retstack_ix = PL_retstack_ix;
482	c->retstack_max = PL_retstack_max;
483	c->curpm = PL_curpm;
484	c->curcop = PL_curcop;
485	c->top_env = PL_top_env;
486	}	485	}
487		486
488	/*	487	/*
489	* allocate various perl stacks. This is an exact copy	488	* allocate various perl stacks. This is an exact copy
490	* of perl.c:init_stacks, except that it uses less memory	489	* of perl.c:init_stacks, except that it uses less memory
491	* on the (sometimes correct) assumption that coroutines do	490	* on the (sometimes correct) assumption that coroutines do
492	* not usually need a lot of stackspace.	491	* not usually need a lot of stackspace.
493	*/	492	*/
494	STATIC void	493	#if CORO_PREFER_PERL_FUNCTIONS
		494	# define coro_init_stacks init_stacks
		495	#else
		496	static void
495	coro_init_stacks (pTHX)	497	coro_init_stacks (pTHX)
496	{	498	{
497	LOCK;	499	PL_curstackinfo = new_stackinfo(64, 6);
498
499	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
500	PL_curstackinfo->si_type = PERLSI_MAIN;	500	PL_curstackinfo->si_type = PERLSI_MAIN;
501	PL_curstack = PL_curstackinfo->si_stack;	501	PL_curstack = PL_curstackinfo->si_stack;
502	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	502	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
503		503
504	PL_stack_base = AvARRAY(PL_curstack);	504	PL_stack_base = AvARRAY(PL_curstack);
505	PL_stack_sp = PL_stack_base;	505	PL_stack_sp = PL_stack_base;
506	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	506	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
507		507
508	New(50,PL_tmps_stack,96,SV*);	508	New(50,PL_tmps_stack,64,SV*);
509	PL_tmps_floor = -1;	509	PL_tmps_floor = -1;
510	PL_tmps_ix = -1;	510	PL_tmps_ix = -1;
511	PL_tmps_max = 96;	511	PL_tmps_max = 64;
512		512
513	New(54,PL_markstack,16,I32);	513	New(54,PL_markstack,16,I32);
514	PL_markstack_ptr = PL_markstack;	514	PL_markstack_ptr = PL_markstack;
515	PL_markstack_max = PL_markstack + 16;	515	PL_markstack_max = PL_markstack + 16;
516		516
…		…
520		520
521	New(54,PL_scopestack,16,I32);	521	New(54,PL_scopestack,16,I32);
522	PL_scopestack_ix = 0;	522	PL_scopestack_ix = 0;
523	PL_scopestack_max = 16;	523	PL_scopestack_max = 16;
524		524
525	New(54,PL_savestack,96,ANY);	525	New(54,PL_savestack,64,ANY);
526	PL_savestack_ix = 0;	526	PL_savestack_ix = 0;
527	PL_savestack_max = 96;	527	PL_savestack_max = 64;
528		528
		529	#if !PERL_VERSION_ATLEAST (5,9,0)
529	New(54,PL_retstack,8,OP*);	530	New(54,PL_retstack,4,OP*);
530	PL_retstack_ix = 0;	531	PL_retstack_ix = 0;
531	PL_retstack_max = 8;	532	PL_retstack_max = 4;
532		533	#endif
533	UNLOCK;
534	}	534	}
		535	#endif
535		536
536	/*	537	/*
537	* destroy the stacks, the callchain etc...	538	* destroy the stacks, the callchain etc...
538	*/	539	*/
539	STATIC void	540	static void
540	destroy_stacks(pTHX)	541	coro_destroy_stacks (pTHX)
541	{	542	{
542	if (!IN_DESTRUCT)
543	{
544	/* is this ugly, I ask? */
545	LEAVE_SCOPE (0);
546
547	/* sure it is, but more important: is it correct?? :/ */
548	FREETMPS;
549
550	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
551	}
552
553	while (PL_curstackinfo->si_next)	543	while (PL_curstackinfo->si_next)
554	PL_curstackinfo = PL_curstackinfo->si_next;	544	PL_curstackinfo = PL_curstackinfo->si_next;
555		545
556	while (PL_curstackinfo)	546	while (PL_curstackinfo)
557	{	547	{
558	PERL_SI *p = PL_curstackinfo->si_prev;	548	PERL_SI *p = PL_curstackinfo->si_prev;
559		549
560	{ /*D*//*remove*/
561	dSP;
562	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
563	PUTBACK; /* possibly superfluous */
564	}
565
566	if (!IN_DESTRUCT)	550	if (!IN_DESTRUCT)
567	{
568	dounwind (-1);/*D*//*remove*/
569	SvREFCNT_dec (PL_curstackinfo->si_stack);	551	SvREFCNT_dec (PL_curstackinfo->si_stack);
570	}
571		552
572	Safefree (PL_curstackinfo->si_cxstack);	553	Safefree (PL_curstackinfo->si_cxstack);
573	Safefree (PL_curstackinfo);	554	Safefree (PL_curstackinfo);
574	PL_curstackinfo = p;	555	PL_curstackinfo = p;
575	}	556	}
576		557
577	Safefree (PL_tmps_stack);	558	Safefree (PL_tmps_stack);
578	Safefree (PL_markstack);	559	Safefree (PL_markstack);
579	Safefree (PL_scopestack);	560	Safefree (PL_scopestack);
580	Safefree (PL_savestack);	561	Safefree (PL_savestack);
		562	#if !PERL_VERSION_ATLEAST (5,9,0)
581	Safefree (PL_retstack);	563	Safefree (PL_retstack);
582	}
583
584	static void
585	allocate_stack (Coro__State ctx, int alloc)
586	{
587	coro_stack *stack;
588
589	New (0, stack, 1, coro_stack);
590
591	stack->refcnt = 1;
592	stack->usecnt = 1;
593	stack->gencnt = ctx->gencnt = 0;
594
595	if (alloc)
596	{
597	#if HAVE_MMAP
598	stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */
599	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
600	if (stack->sptr == (void *)-1)
601	#endif	564	#endif
		565	}
		566
		567	static size_t
		568	coro_rss (pTHX_ struct coro *coro)
		569	{
		570	size_t rss = sizeof (*coro);
		571
		572	if (coro->mainstack)
		573	{
		574	if (coro->flags & CF_RUNNING)
602	{	575	{
603	/*FIXME*//*D*//* reasonable stack size! */	576	#define VAR(name,type)coro->name = PL_ ## name;
604	stack->ssize = - (STACKSIZE * sizeof (long));	577	# include "state.h"
605	New (0, stack->sptr, STACKSIZE, long);	578	#undef VAR
606	}	579	}
607	}
608	else
609	stack->sptr = 0;
610		580
611	ctx->stack = stack;	581	rss += sizeof (coro->curstackinfo);
612	}	582	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvFILL (coro->curstackinfo->si_stack)) * sizeof (SV *);
		583	rss += (coro->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		584	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvFILL (coro->curstack)) * sizeof (SV *);
		585	rss += coro->tmps_max * sizeof (SV *);
		586	rss += (coro->markstack_max - coro->markstack_ptr) * sizeof (I32);
		587	rss += coro->scopestack_max * sizeof (I32);
		588	rss += coro->savestack_max * sizeof (ANY);
613		589
614	static void	590	#if !PERL_VERSION_ATLEAST (5,9,0)
615	deallocate_stack (Coro__State ctx)	591	rss += coro->retstack_max * sizeof (OP *);
616	{	592	#endif
617	coro_stack *stack = ctx->stack;
618
619	ctx->stack = 0;
620
621	if (stack)
622	{	593	}
623	if (!--stack->refcnt)
624	{
625	#ifdef HAVE_MMAP
626	if (stack->ssize > 0 && stack->sptr)
627	munmap (stack->sptr, stack->ssize);
628	else
629	#endif
630	Safefree (stack->sptr);
631		594
632	Safefree (stack);	595	return rss;
633	}
634	else if (ctx->gencnt == stack->gencnt)
635	--stack->usecnt;
636	}
637	}	596	}
638		597
		598	/** coroutine stack handling ************************************************/
		599
639	static void	600	static void
640	setup_coro (void *arg)	601	coro_setup (pTHX_ struct coro *coro)
641	{	602	{
642	/*	603	/*
643	* emulate part of the perl startup here.	604	* emulate part of the perl startup here.
644	*/	605	*/
		606	coro_init_stacks (aTHX);
		607
		608	PL_runops = RUNOPS_DEFAULT;
		609	PL_curcop = &PL_compiling;
		610	PL_in_eval = EVAL_NULL;
		611	PL_comppad = 0;
		612	PL_curpm = 0;
		613	PL_curpad = 0;
		614	PL_localizing = 0;
		615	PL_dirty = 0;
		616	PL_restartop = 0;
		617
		618	GvSV (PL_defgv) = newSV (0);
		619	GvAV (PL_defgv) = coro->args; coro->args = 0;
		620	GvSV (PL_errgv) = newSV (0);
		621	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		622	PL_rs = newSVsv (GvSV (irsgv));
		623	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		624
		625	{
		626	dSP;
		627	LOGOP myop;
		628
		629	Zero (&myop, 1, LOGOP);
		630	myop.op_next = Nullop;
		631	myop.op_flags = OPf_WANT_VOID;
		632
		633	PUSHMARK (SP);
		634	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		635	PUTBACK;
		636	PL_op = (OP *)&myop;
		637	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		638	SPAGAIN;
		639	}
		640
		641	ENTER; /* necessary e.g. for dounwind and to balance the xsub-entersub */
		642	}
		643
		644	static void
		645	coro_destroy (pTHX_ struct coro *coro)
		646	{
		647	if (!IN_DESTRUCT)
		648	{
		649	/* restore all saved variables and stuff */
		650	LEAVE_SCOPE (0);
		651	assert (PL_tmps_floor == -1);
		652
		653	/* free all temporaries */
		654	FREETMPS;
		655	assert (PL_tmps_ix == -1);
		656
		657	/* unwind all extra stacks */
		658	POPSTACK_TO (PL_mainstack);
		659
		660	/* unwind main stack */
		661	dounwind (-1);
		662	}
		663
		664	SvREFCNT_dec (GvSV (PL_defgv));
		665	SvREFCNT_dec (GvAV (PL_defgv));
		666	SvREFCNT_dec (GvSV (PL_errgv));
		667	SvREFCNT_dec (PL_defoutgv);
		668	SvREFCNT_dec (PL_rs);
		669	SvREFCNT_dec (GvSV (irsgv));
		670
		671	SvREFCNT_dec (coro->saved_deffh);
		672	SvREFCNT_dec (coro->throw);
		673
		674	coro_destroy_stacks (aTHX);
		675	}
		676
		677	static void
		678	free_coro_mortal (pTHX)
		679	{
		680	if (expect_true (coro_mortal))
		681	{
		682	SvREFCNT_dec (coro_mortal);
		683	coro_mortal = 0;
		684	}
		685	}
		686
		687	static int
		688	runops_trace (pTHX)
		689	{
		690	COP *oldcop = 0;
		691	int oldcxix = -2;
		692	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		693	coro_cctx *cctx = coro->cctx;
		694
		695	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		696	{
		697	PERL_ASYNC_CHECK ();
		698
		699	if (cctx->flags & CC_TRACE_ALL)
		700	{
		701	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
		702	{
		703	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		704	SV **bot, **top;
		705	AV *av = newAV (); /* return values */
		706	SV **cb;
		707	dSP;
		708
		709	GV *gv = CvGV (cx->blk_sub.cv);
		710	SV *fullname = sv_2mortal (newSV (0));
		711	if (isGV (gv))
		712	gv_efullname3 (fullname, gv, 0);
		713
		714	bot = PL_stack_base + cx->blk_oldsp + 1;
		715	top = cx->blk_gimme == G_ARRAY ? SP + 1
		716	: cx->blk_gimme == G_SCALAR ? bot + 1
		717	: bot;
		718
		719	av_extend (av, top - bot);
		720	while (bot < top)
		721	av_push (av, SvREFCNT_inc (*bot++));
		722
		723	PL_runops = RUNOPS_DEFAULT;
		724	ENTER;
		725	SAVETMPS;
		726	EXTEND (SP, 3);
		727	PUSHMARK (SP);
		728	PUSHs (&PL_sv_no);
		729	PUSHs (fullname);
		730	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		731	PUTBACK;
		732	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		733	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		734	SPAGAIN;
		735	FREETMPS;
		736	LEAVE;
		737	PL_runops = runops_trace;
		738	}
		739
		740	if (oldcop != PL_curcop)
		741	{
		742	oldcop = PL_curcop;
		743
		744	if (PL_curcop != &PL_compiling)
		745	{
		746	SV **cb;
		747
		748	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
		749	{
		750	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		751
		752	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
		753	{
		754	runops_proc_t old_runops = PL_runops;
		755	dSP;
		756	GV *gv = CvGV (cx->blk_sub.cv);
		757	SV *fullname = sv_2mortal (newSV (0));
		758
		759	if (isGV (gv))
		760	gv_efullname3 (fullname, gv, 0);
		761
		762	PL_runops = RUNOPS_DEFAULT;
		763	ENTER;
		764	SAVETMPS;
		765	EXTEND (SP, 3);
		766	PUSHMARK (SP);
		767	PUSHs (&PL_sv_yes);
		768	PUSHs (fullname);
		769	PUSHs (cx->blk_sub.hasargs ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		770	PUTBACK;
		771	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		772	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		773	SPAGAIN;
		774	FREETMPS;
		775	LEAVE;
		776	PL_runops = runops_trace;
		777	}
		778
		779	oldcxix = cxstack_ix;
		780	}
		781
		782	if (cctx->flags & CC_TRACE_LINE)
		783	{
		784	dSP;
		785
		786	PL_runops = RUNOPS_DEFAULT;
		787	ENTER;
		788	SAVETMPS;
		789	EXTEND (SP, 3);
		790	PL_runops = RUNOPS_DEFAULT;
		791	PUSHMARK (SP);
		792	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		793	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		794	PUTBACK;
		795	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		796	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		797	SPAGAIN;
		798	FREETMPS;
		799	LEAVE;
		800	PL_runops = runops_trace;
		801	}
		802	}
		803	}
		804	}
		805	}
		806
		807	TAINT_NOT;
		808	return 0;
		809	}
		810
		811	/* inject a fake call to Coro::State::_cctx_init into the execution */
		812	/* _cctx_init should be careful, as it could be called at almost any time */
		813	/* during execution of a perl program */
		814	static void NOINLINE
		815	prepare_cctx (pTHX_ coro_cctx *cctx)
		816	{
		817	dSP;
		818	LOGOP myop;
		819
		820	PL_top_env = &PL_start_env;
		821
		822	if (cctx->flags & CC_TRACE)
		823	PL_runops = runops_trace;
		824
		825	Zero (&myop, 1, LOGOP);
		826	myop.op_next = PL_op;
		827	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		828
		829	PUSHMARK (SP);
		830	EXTEND (SP, 2);
		831	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		832	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		833	PUTBACK;
		834	PL_op = (OP *)&myop;
		835	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		836	SPAGAIN;
		837	}
		838
		839	/*
		840	* this is a _very_ stripped down perl interpreter ;)
		841	*/
		842	static void
		843	coro_run (void *arg)
		844	{
645	dTHX;	845	dTHX;
646	dSP;
647	Coro__State ctx = (Coro__State)arg;
648	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
649		846
650	coro_init_stacks (aTHX);	847	/* coro_run is the alternative tail of transfer(), so unlock here. */
651	/*PL_curcop = 0;*/	848	UNLOCK;
652	/*PL_in_eval = PL_in_eval;*/ /* inherit */
653	SvREFCNT_dec (GvAV (PL_defgv));
654	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
655		849
656	SPAGAIN;	850	/* we now skip the entersub that lead to transfer() */
		851	PL_op = PL_op->op_next;
657		852
658	if (ctx->stack)	853	/* inject a fake subroutine call to cctx_init */
659	{	854	prepare_cctx (aTHX_ (coro_cctx *)arg);
660	ctx->cursp = 0;
661		855
662	PUSHMARK(SP);	856	/* somebody or something will hit me for both perl_run and PL_restartop */
663	PUTBACK;	857	PL_restartop = PL_op;
664	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);	858	perl_run (PL_curinterp);
665		859
666	if (SvTRUE (ERRSV))	860	/*
667	croak (NULL);	861	* If perl-run returns we assume exit() was being called or the coro
668	else	862	* fell off the end, which seems to be the only valid (non-bug)
669	croak ("FATAL: CCTXT coroutine returned!");	863	* reason for perl_run to return. We try to exit by jumping to the
		864	* bootstrap-time "top" top_env, as we cannot restore the "main"
		865	* coroutine as Coro has no such concept
		866	*/
		867	PL_top_env = main_top_env;
		868	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		869	}
		870
		871	static coro_cctx *
		872	cctx_new ()
		873	{
		874	coro_cctx *cctx;
		875	void *stack_start;
		876	size_t stack_size;
		877
		878	++cctx_count;
		879
		880	Newz (0, cctx, 1, coro_cctx);
		881
		882	#if HAVE_MMAP
		883
		884	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		885	/* mmap supposedly does allocate-on-write for us */
		886	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		887
		888	if (cctx->sptr != (void *)-1)
		889	{
		890	# if CORO_STACKGUARD
		891	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		892	# endif
		893	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		894	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		895	cctx->flags |= CC_MAPPED;
670	}	896	}
671	else	897	else
672	{	898	#endif
673	UNOP myop;
674
675	PL_op = (OP *)&myop;
676
677	Zero(&myop, 1, UNOP);
678	myop.op_next = Nullop;
679	myop.op_flags = OPf_WANT_VOID;
680
681	PUSHMARK(SP);
682	XPUSHs (sub_init);
683	/*
684	* the next line is slightly wrong, as PL_op->op_next
685	* is actually being executed so we skip the first op.
686	* that doesn't matter, though, since it is only
687	* pp_nextstate and we never return...
688	* ah yes, and I don't care anyways ;)
689	*/
690	PUTBACK;
691	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
692	SPAGAIN;
693
694	ENTER; /* necessary e.g. for dounwind */
695	}	899	{
696	}	900	cctx->ssize = coro_stacksize * (long)sizeof (long);
		901	New (0, cctx->sptr, coro_stacksize, long);
697		902
698	static void	903	if (!cctx->sptr)
699	continue_coro (void *arg)	904	{
700	{	905	perror ("FATAL: unable to allocate stack for coroutine");
701	/*	906	_exit (EXIT_FAILURE);
702	* this is a _very_ stripped down perl interpreter ;)	907	}
703	*/
704	dTHX;
705	Coro__State ctx = (Coro__State)arg;
706	JMPENV coro_start_env;
707		908
708	PL_top_env = &ctx->start_env;	909	stack_start = cctx->sptr;
		910	stack_size = cctx->ssize;
		911	}
709		912
710	ctx->cursp = 0;	913	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
711	PL_op = PL_op->op_next;	914	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
712	CALLRUNOPS(aTHX);
713		915
714	abort ();	916	return cctx;
715	}	917	}
716		918
717	STATIC void	919	static void
		920	cctx_destroy (coro_cctx *cctx)
		921	{
		922	if (!cctx)
		923	return;
		924
		925	--cctx_count;
		926
		927	#if CORO_USE_VALGRIND
		928	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		929	#endif
		930
		931	#if HAVE_MMAP
		932	if (cctx->flags & CC_MAPPED)
		933	munmap (cctx->sptr, cctx->ssize);
		934	else
		935	#endif
		936	Safefree (cctx->sptr);
		937
		938	Safefree (cctx);
		939	}
		940
		941	/* wether this cctx should be destructed */
		942	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		943
		944	static coro_cctx *
		945	cctx_get (pTHX)
		946	{
		947	while (expect_true (cctx_first))
		948	{
		949	coro_cctx *cctx = cctx_first;
		950	cctx_first = cctx->next;
		951	--cctx_idle;
		952
		953	if (expect_true (!CCTX_EXPIRED (cctx)))
		954	return cctx;
		955
		956	cctx_destroy (cctx);
		957	}
		958
		959	return cctx_new ();
		960	}
		961
		962	static void
		963	cctx_put (coro_cctx *cctx)
		964	{
		965	/* free another cctx if overlimit */
		966	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		967	{
		968	coro_cctx *first = cctx_first;
		969	cctx_first = first->next;
		970	--cctx_idle;
		971
		972	cctx_destroy (first);
		973	}
		974
		975	++cctx_idle;
		976	cctx->next = cctx_first;
		977	cctx_first = cctx;
		978	}
		979
		980	/** coroutine switching *****************************************************/
		981
		982	static void
		983	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		984	{
		985	if (expect_true (prev != next))
		986	{
		987	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		988	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		989
		990	if (expect_false (next->flags & CF_RUNNING))
		991	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		992
		993	if (expect_false (next->flags & CF_DESTROYED))
		994	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		995
		996	if (expect_false (PL_lex_state != LEX_NOTPARSING))
		997	croak ("Coro::State::transfer called while parsing, but this is not supported");
		998	}
		999	}
		1000
		1001	/* always use the TRANSFER macro */
		1002	static void NOINLINE
718	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)	1003	transfer (pTHX_ struct coro *prev, struct coro *next)
719	{	1004	{
720	dSTACKLEVEL;	1005	dSTACKLEVEL;
721		1006
722	if (prev != next)	1007	/* sometimes transfer is only called to set idle_sp */
		1008	if (expect_false (!next))
		1009	{
		1010	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1011	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
723	{	1012	}
724	if (next->mainstack)	1013	else if (expect_true (prev != next))
		1014	{
		1015	coro_cctx *prev__cctx;
		1016
		1017	if (expect_false (prev->flags & CF_NEW))
725	{	1018	{
726	LOCK;	1019	/* create a new empty context */
727	SAVE (prev, flags);	1020	Newz (0, prev->cctx, 1, coro_cctx);
728	LOAD (next);	1021	prev->flags &= ~CF_NEW;
729	UNLOCK;	1022	prev->flags |= CF_RUNNING;
730
731	/* mark this state as in-use */
732	next->mainstack = 0;
733	next->tmps_ix = -2;
734
735	/* stacklevel changed? if yes, grab the stack for us! */
736	if (flags & TRANSFER_SAVE_CCTXT)
737	{
738	if (!prev->stack)
739	allocate_stack (prev, 0);
740	else if (prev->cursp != stacklevel
741	&& prev->stack->usecnt > 1)
742	{
743	prev->gencnt = ++prev->stack->gencnt;
744	prev->stack->usecnt = 1;
745	}
746
747	/* has our stack been invalidated? */
748	if (next->stack && next->stack->gencnt != next->gencnt)
749	{
750	deallocate_stack (next);
751	allocate_stack (next, 1);
752	coro_create (&(next->stack->cctx),
753	continue_coro, (void *)next,
754	next->stack->sptr, labs (next->stack->ssize));
755	}
756
757	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
758	prev->cursp = stacklevel;
759	/* don't add any code here */
760	}
761	else
762	next->cursp = stacklevel;
763	}	1023	}
764	else if (next->tmps_ix == -2)	1024
765	croak ("tried to transfer to running coroutine");	1025	prev->flags &= ~CF_RUNNING;
		1026	next->flags |= CF_RUNNING;
		1027
		1028	LOCK;
		1029
		1030	if (expect_false (next->flags & CF_NEW))
		1031	{
		1032	/* need to start coroutine */
		1033	next->flags &= ~CF_NEW;
		1034	/* first get rid of the old state */
		1035	save_perl (aTHX_ prev);
		1036	/* setup coroutine call */
		1037	coro_setup (aTHX_ next);
		1038	}
766	else	1039	else
767	{	1040	{
768	LOCK;	1041	/* coroutine already started */
769	SAVE (prev, -1); /* first get rid of the old state */	1042	save_perl (aTHX_ prev);
		1043	load_perl (aTHX_ next);
		1044	}
		1045
		1046	prev__cctx = prev->cctx;
		1047
		1048	/* possibly "free" the cctx */
		1049	if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
		1050	{
		1051	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1052	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1053
		1054	prev->cctx = 0;
		1055
		1056	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1057	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1058	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1059	next->cctx = cctx_get (aTHX);
		1060
		1061	cctx_put (prev__cctx);
		1062	}
		1063
		1064	++next->usecount;
		1065
		1066	if (expect_true (!next->cctx))
		1067	next->cctx = cctx_get (aTHX);
		1068
		1069	if (expect_false (prev__cctx != next->cctx))
		1070	{
		1071	prev__cctx->top_env = PL_top_env;
		1072	PL_top_env = next->cctx->top_env;
		1073	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1074	}
		1075
		1076	free_coro_mortal (aTHX);
770	UNLOCK;	1077	UNLOCK;
771		1078
772	if (flags & TRANSFER_SAVE_CCTXT)	1079	if (expect_false (prev->throw || next->throw))
		1080	{
		1081	struct coro *coro = SvSTATE (coro_current);
		1082
		1083	if (coro->throw)
773	{	1084	{
774	if (!prev->stack)	1085	SV *exception = coro->throw;
775	allocate_stack (prev, 0);	1086	coro->throw = 0;
776		1087	sv_setsv (ERRSV, exception);
777	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
778	{
779	PL_top_env = &next->start_env;
780
781	setup_coro (next);
782	next->cursp = stacklevel;
783
784	prev->stack->refcnt++;
785	prev->stack->usecnt++;
786	next->stack = prev->stack;
787	next->gencnt = prev->gencnt;
788	}
789	else
790	{
791	assert (!next->stack);
792	allocate_stack (next, 1);
793	coro_create (&(next->stack->cctx),
794	setup_coro, (void *)next,
795	next->stack->sptr, labs (next->stack->ssize));
796	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
797	prev->cursp = stacklevel;
798	/* don't add any code here */
799	}
800	}
801	else
802	{
803	setup_coro (next);	1088	croak (0);
804	next->cursp = stacklevel;
805	}	1089	}
806	}	1090	}
807	}	1091	}
		1092	}
808		1093
809	LOCK;	1094	struct transfer_args
810	if (coro_mortal)	1095	{
811	{	1096	struct coro *prev, *next;
812	SvREFCNT_dec (coro_mortal);	1097	};
813	coro_mortal = 0;	1098
		1099	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1100	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1101
		1102	/** high level stuff ********************************************************/
		1103
		1104	static int
		1105	coro_state_destroy (pTHX_ struct coro *coro)
		1106	{
		1107	if (coro->flags & CF_DESTROYED)
		1108	return 0;
		1109
		1110	coro->flags |= CF_DESTROYED;
		1111
		1112	if (coro->flags & CF_READY)
814	}	1113	{
		1114	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1115	/* alternative: look through all ready queues and remove the coro */
		1116	LOCK;
		1117	--coro_nready;
815	UNLOCK;	1118	UNLOCK;
816	}	1119	}
		1120	else
		1121	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
817		1122
818	#define SV_CORO(sv,func) \	1123	if (coro->mainstack && coro->mainstack != main_mainstack)
819	do { \	1124	{
820	if (SvROK (sv)) \	1125	struct coro temp;
821	sv = SvRV (sv); \
822	\
823	if (SvTYPE (sv) == SVt_PVHV) \
824	{ \
825	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
826	\
827	if (!he) \
828	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
829	\
830	(sv) = SvRV (HeVAL(he)); \
831	} \
832	\
833	/* must also be changed inside Coro::Cont::yield */ \
834	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
835	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
836	\
837	} while(0)
838		1126
839	#define SvSTATE(sv) (struct coro *)SvIV (sv)	1127	if (coro->flags & CF_RUNNING)
		1128	croak ("FATAL: tried to destroy currently running coroutine");
840		1129
		1130	save_perl (aTHX_ &temp);
		1131	load_perl (aTHX_ coro);
		1132
		1133	coro_destroy (aTHX_ coro);
		1134
		1135	load_perl (aTHX_ &temp); /* this will get rid of defsv etc.. */
		1136
		1137	coro->mainstack = 0;
		1138	}
		1139
		1140	cctx_destroy (coro->cctx);
		1141	SvREFCNT_dec (coro->args);
		1142
		1143	if (coro->next) coro->next->prev = coro->prev;
		1144	if (coro->prev) coro->prev->next = coro->next;
		1145	if (coro == coro_first) coro_first = coro->next;
		1146
		1147	return 1;
		1148	}
		1149
841	static void	1150	static int
		1151	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1152	{
		1153	struct coro *coro = (struct coro *)mg->mg_ptr;
		1154	mg->mg_ptr = 0;
		1155
		1156	coro->hv = 0;
		1157
		1158	if (--coro->refcnt < 0)
		1159	{
		1160	coro_state_destroy (aTHX_ coro);
		1161	Safefree (coro);
		1162	}
		1163
		1164	return 0;
		1165	}
		1166
		1167	static int
		1168	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1169	{
		1170	struct coro *coro = (struct coro *)mg->mg_ptr;
		1171
		1172	++coro->refcnt;
		1173
		1174	return 0;
		1175	}
		1176
		1177	static MGVTBL coro_state_vtbl = {
		1178	0, 0, 0, 0,
		1179	coro_state_free,
		1180	0,
		1181	#ifdef MGf_DUP
		1182	coro_state_dup,
		1183	#else
		1184	# define MGf_DUP 0
		1185	#endif
		1186	};
		1187
		1188	static void
		1189	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1190	{
		1191	ta->prev = SvSTATE (prev_sv);
		1192	ta->next = SvSTATE (next_sv);
		1193	TRANSFER_CHECK (*ta);
		1194	}
		1195
		1196	static void
842	api_transfer(pTHX_ SV *prev, SV *next, int flags)	1197	api_transfer (SV *prev_sv, SV *next_sv)
843	{	1198	{
844	SV_CORO (prev, "Coro::transfer");	1199	dTHX;
845	SV_CORO (next, "Coro::transfer");	1200	struct transfer_args ta;
846		1201
847	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1202	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1203	TRANSFER (ta);
848	}	1204	}
849		1205
850	/** Coro ********************************************************************/	1206	/** Coro ********************************************************************/
851		1207
852	#define PRIO_MAX 3
853	#define PRIO_HIGH 1
854	#define PRIO_NORMAL 0
855	#define PRIO_LOW -1
856	#define PRIO_IDLE -3
857	#define PRIO_MIN -4
858
859	/* for Coro.pm */
860	static GV *coro_current, *coro_idle;
861	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];
862	static int coro_nready;
863
864	static void	1208	static void
865	coro_enq (pTHX_ SV *sv)	1209	coro_enq (pTHX_ SV *coro_sv)
866	{	1210	{
867	if (SvTYPE (sv) == SVt_PVHV)
868	{
869	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
870	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
871
872	prio = prio > PRIO_MAX ? PRIO_MAX
873	: prio < PRIO_MIN ? PRIO_MIN
874	: prio;
875
876	av_push (coro_ready [prio - PRIO_MIN], sv);	1211	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
877	coro_nready++;
878
879	return;
880	}
881
882	croak ("Coro::ready tried to enqueue something that is not a coroutine");
883	}	1212	}
884		1213
885	static SV *	1214	static SV *
886	coro_deq (pTHX_ int min_prio)	1215	coro_deq (pTHX_ int min_prio)
887	{	1216	{
…		…
890	min_prio -= PRIO_MIN;	1219	min_prio -= PRIO_MIN;
891	if (min_prio < 0)	1220	if (min_prio < 0)
892	min_prio = 0;	1221	min_prio = 0;
893		1222
894	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1223	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
895	if (av_len (coro_ready[prio]) >= 0)	1224	if (AvFILLp (coro_ready [prio]) >= 0)
896	{
897	coro_nready--;
898	return av_shift (coro_ready[prio]);	1225	return av_shift (coro_ready [prio]);
899	}
900		1226
901	return 0;	1227	return 0;
902	}	1228	}
903		1229
904	static void	1230	static int
905	api_ready (SV *coro)	1231	api_ready (SV *coro_sv)
906	{	1232	{
907	dTHX;	1233	dTHX;
		1234	struct coro *coro;
908		1235
909	if (SvROK (coro))	1236	if (SvROK (coro_sv))
910	coro = SvRV (coro);	1237	coro_sv = SvRV (coro_sv);
		1238
		1239	coro = SvSTATE (coro_sv);
		1240
		1241	if (coro->flags & CF_READY)
		1242	return 0;
		1243
		1244	coro->flags |= CF_READY;
911		1245
912	LOCK;	1246	LOCK;
913	coro_enq (aTHX_ SvREFCNT_inc (coro));	1247	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1248	++coro_nready;
914	UNLOCK;	1249	UNLOCK;
		1250
		1251	return 1;
		1252	}
		1253
		1254	static int
		1255	api_is_ready (SV *coro_sv)
		1256	{
		1257	dTHX;
		1258	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1259	}
		1260
		1261	static void
		1262	prepare_schedule (pTHX_ struct transfer_args *ta)
		1263	{
		1264	SV *prev_sv, *next_sv;
		1265
		1266	for (;;)
		1267	{
		1268	LOCK;
		1269	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1270
		1271	/* nothing to schedule: call the idle handler */
		1272	if (expect_false (!next_sv))
		1273	{
		1274	dSP;
		1275	UNLOCK;
		1276
		1277	ENTER;
		1278	SAVETMPS;
		1279
		1280	PUSHMARK (SP);
		1281	PUTBACK;
		1282	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1283
		1284	FREETMPS;
		1285	LEAVE;
		1286	continue;
		1287	}
		1288
		1289	ta->next = SvSTATE (next_sv);
		1290
		1291	/* cannot transfer to destroyed coros, skip and look for next */
		1292	if (expect_false (ta->next->flags & CF_DESTROYED))
		1293	{
		1294	UNLOCK;
		1295	SvREFCNT_dec (next_sv);
		1296	/* coro_nready is already taken care of by destroy */
		1297	continue;
		1298	}
		1299
		1300	--coro_nready;
		1301	UNLOCK;
		1302	break;
		1303	}
		1304
		1305	/* free this only after the transfer */
		1306	prev_sv = SvRV (coro_current);
		1307	ta->prev = SvSTATE (prev_sv);
		1308	TRANSFER_CHECK (*ta);
		1309	assert (ta->next->flags & CF_READY);
		1310	ta->next->flags &= ~CF_READY;
		1311	SvRV_set (coro_current, next_sv);
		1312
		1313	LOCK;
		1314	free_coro_mortal (aTHX);
		1315	coro_mortal = prev_sv;
		1316	UNLOCK;
		1317	}
		1318
		1319	static void
		1320	prepare_cede (pTHX_ struct transfer_args *ta)
		1321	{
		1322	api_ready (coro_current);
		1323	prepare_schedule (aTHX_ ta);
		1324	}
		1325
		1326	static int
		1327	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1328	{
		1329	if (coro_nready)
		1330	{
		1331	SV *prev = SvRV (coro_current);
		1332	prepare_schedule (aTHX_ ta);
		1333	api_ready (prev);
		1334	return 1;
		1335	}
		1336	else
		1337	return 0;
915	}	1338	}
916		1339
917	static void	1340	static void
918	api_schedule (void)	1341	api_schedule (void)
919	{	1342	{
920	dTHX;	1343	dTHX;
		1344	struct transfer_args ta;
921		1345
922	SV *prev, *next;	1346	prepare_schedule (aTHX_ &ta);
923		1347	TRANSFER (ta);
924	LOCK;
925
926	prev = SvRV (GvSV (coro_current));
927	next = coro_deq (aTHX_ PRIO_MIN);
928
929	if (!next)
930	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
931
932	/* free this only after the transfer */
933	coro_mortal = prev;
934	SV_CORO (prev, "Coro::schedule");
935
936	SvRV (GvSV (coro_current)) = next;
937
938	SV_CORO (next, "Coro::schedule");
939
940	UNLOCK;
941
942	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
943	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
944	}	1348	}
945		1349
946	static void	1350	static int
947	api_cede (void)	1351	api_cede (void)
948	{	1352	{
949	dTHX;	1353	dTHX;
		1354	struct transfer_args ta;
950		1355
951	LOCK;	1356	prepare_cede (aTHX_ &ta);
952	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
953	UNLOCK;
954		1357
955	api_schedule ();	1358	if (expect_true (ta.prev != ta.next))
		1359	{
		1360	TRANSFER (ta);
		1361	return 1;
		1362	}
		1363	else
		1364	return 0;
956	}	1365	}
957		1366
		1367	static int
		1368	api_cede_notself (void)
		1369	{
		1370	dTHX;
		1371	struct transfer_args ta;
		1372
		1373	if (prepare_cede_notself (aTHX_ &ta))
		1374	{
		1375	TRANSFER (ta);
		1376	return 1;
		1377	}
		1378	else
		1379	return 0;
		1380	}
		1381
		1382	static void
		1383	api_trace (SV *coro_sv, int flags)
		1384	{
		1385	dTHX;
		1386	struct coro *coro = SvSTATE (coro_sv);
		1387
		1388	if (flags & CC_TRACE)
		1389	{
		1390	if (!coro->cctx)
		1391	coro->cctx = cctx_new ();
		1392	else if (!(coro->cctx->flags & CC_TRACE))
		1393	croak ("cannot enable tracing on coroutine with custom stack");
		1394
		1395	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1396	}
		1397	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1398	{
		1399	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1400
		1401	if (coro->flags & CF_RUNNING)
		1402	PL_runops = RUNOPS_DEFAULT;
		1403	else
		1404	coro->runops = RUNOPS_DEFAULT;
		1405	}
		1406	}
		1407
958	MODULE = Coro::State PACKAGE = Coro::State	1408	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
959		1409
960	PROTOTYPES: ENABLE	1410	PROTOTYPES: DISABLE
961		1411
962	BOOT:	1412	BOOT:
963	{ /* {} necessary for stoopid perl-5.6.x */	1413	{
964	#ifdef USE_ITHREADS	1414	#ifdef USE_ITHREADS
965	MUTEX_INIT (&coro_mutex);	1415	MUTEX_INIT (&coro_mutex);
966	#endif	1416	#endif
		1417	BOOT_PAGESIZE;
967		1418
968	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1419	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
969	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1420	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1421
970	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1422	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
971		1423
972	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1424	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
973	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1425	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
974	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1426	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
975	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1427	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
976		1428
977	main_mainstack = PL_mainstack;	1429	main_mainstack = PL_mainstack;
		1430	main_top_env = PL_top_env;
		1431
		1432	while (main_top_env->je_prev)
		1433	main_top_env = main_top_env->je_prev;
978		1434
979	coroapi.ver = CORO_API_VERSION;	1435	coroapi.ver = CORO_API_VERSION;
980	coroapi.transfer = api_transfer;	1436	coroapi.transfer = api_transfer;
981	}
982		1437
983	Coro::State	1438	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
984	_newprocess(args)	1439	}
985	SV * args	1440
986	PROTOTYPE: $	1441	SV *
		1442	new (char *klass, ...)
987	CODE:	1443	CODE:
988	Coro__State coro;	1444	{
		1445	struct coro *coro;
		1446	HV *hv;
		1447	int i;
989		1448
990	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
991	croak ("Coro::State::_newprocess expects an arrayref");
992
993	Newz (0, coro, 1, struct coro);	1449	Newz (0, coro, 1, struct coro);
		1450	coro->args = newAV ();
		1451	coro->flags = CF_NEW;
994		1452
995	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1453	if (coro_first) coro_first->prev = coro;
996	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1454	coro->next = coro_first;
997	/*coro->stack = 0;*/	1455	coro_first = coro;
998		1456
999	/* same as JMPENV_BOOTSTRAP */	1457	coro->hv = hv = newHV ();
1000	/* we might be able to recycle start_env, but safe is safe */	1458	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1001	/*Zero(&coro->start_env, 1, JMPENV);*/	1459	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1002	coro->start_env.je_ret = -1;
1003	coro->start_env.je_mustcatch = TRUE;
1004		1460
1005	RETVAL = coro;	1461	av_extend (coro->args, items - 1);
		1462	for (i = 1; i < items; i++)
		1463	av_push (coro->args, newSVsv (ST (i)));
		1464	}
1006	OUTPUT:	1465	OUTPUT:
1007	RETVAL	1466	RETVAL
1008		1467
		1468	# these not obviously related functions are all rolled into the same xs
		1469	# function to increase chances that they all will call transfer with the same
		1470	# stack offset
1009	void	1471	void
1010	transfer(prev, next, flags)	1472	_set_stacklevel (...)
1011	SV *prev	1473	ALIAS:
1012	SV *next	1474	Coro::State::transfer = 1
1013	int flags	1475	Coro::schedule = 2
1014	PROTOTYPE: @	1476	Coro::cede = 3
		1477	Coro::cede_notself = 4
1015	CODE:	1478	CODE:
1016	PUTBACK;	1479	{
1017	SV_CORO (next, "Coro::transfer");	1480	struct transfer_args ta;
1018	SV_CORO (prev, "Coro::transfer");	1481
1019	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1482	switch (ix)
1020	SPAGAIN;	1483	{
		1484	case 0:
		1485	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1486	ta.next = 0;
		1487	break;
		1488
		1489	case 1:
		1490	if (items != 2)
		1491	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1492
		1493	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1494	break;
		1495
		1496	case 2:
		1497	prepare_schedule (aTHX_ &ta);
		1498	break;
		1499
		1500	case 3:
		1501	prepare_cede (aTHX_ &ta);
		1502	break;
		1503
		1504	case 4:
		1505	if (!prepare_cede_notself (aTHX_ &ta))
		1506	XSRETURN_EMPTY;
		1507
		1508	break;
		1509	}
		1510
		1511	BARRIER;
		1512	TRANSFER (ta);
		1513
		1514	if (expect_false (GIMME_V != G_VOID && ta.next != ta.prev))
		1515	XSRETURN_YES;
		1516	}
		1517
		1518	bool
		1519	_destroy (SV *coro_sv)
		1520	CODE:
		1521	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1522	OUTPUT:
		1523	RETVAL
1021		1524
1022	void	1525	void
1023	DESTROY(coro)
1024	Coro::State coro
1025	CODE:
1026
1027	if (coro->mainstack && coro->mainstack != main_mainstack)
1028	{
1029	struct coro temp;
1030
1031	PUTBACK;
1032	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
1033	LOAD (aTHX_ coro);
1034	SPAGAIN;
1035
1036	destroy_stacks (aTHX);
1037
1038	LOAD ((&temp)); /* this will get rid of defsv etc.. */
1039	SPAGAIN;
1040
1041	coro->mainstack = 0;
1042	}
1043
1044	deallocate_stack (coro);
1045	SvREFCNT_dec (coro->args);
1046	Safefree (coro);
1047
1048	void
1049	_exit(code)	1526	_exit (code)
1050	int code	1527	int code
1051	PROTOTYPE: $	1528	PROTOTYPE: $
1052	CODE:	1529	CODE:
1053	_exit (code);	1530	_exit (code);
1054		1531
1055	MODULE = Coro::State PACKAGE = Coro::Cont	1532	int
		1533	cctx_stacksize (int new_stacksize = 0)
		1534	CODE:
		1535	RETVAL = coro_stacksize;
		1536	if (new_stacksize)
		1537	coro_stacksize = new_stacksize;
		1538	OUTPUT:
		1539	RETVAL
1056		1540
1057	# this is slightly dirty (should expose a c-level api)	1541	int
		1542	cctx_count ()
		1543	CODE:
		1544	RETVAL = cctx_count;
		1545	OUTPUT:
		1546	RETVAL
		1547
		1548	int
		1549	cctx_idle ()
		1550	CODE:
		1551	RETVAL = cctx_idle;
		1552	OUTPUT:
		1553	RETVAL
1058		1554
1059	void	1555	void
1060	yield(...)	1556	list ()
1061	PROTOTYPE: @	1557	PPCODE:
		1558	{
		1559	struct coro *coro;
		1560	for (coro = coro_first; coro; coro = coro->next)
		1561	if (coro->hv)
		1562	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1563	}
		1564
		1565	void
		1566	call (Coro::State coro, SV *coderef)
		1567	ALIAS:
		1568	eval = 1
		1569	CODE:
		1570	{
		1571	if (coro->mainstack)
		1572	{
		1573	struct coro temp;
		1574	Zero (&temp, 1, struct coro);
		1575
		1576	if (!(coro->flags & CF_RUNNING))
		1577	{
		1578	save_perl (aTHX_ &temp);
		1579	load_perl (aTHX_ coro);
		1580	}
		1581
		1582	{
		1583	dSP;
		1584	ENTER;
		1585	SAVETMPS;
		1586	PUSHMARK (SP);
		1587	PUTBACK;
		1588	if (ix)
		1589	eval_sv (coderef, 0);
		1590	else
		1591	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1592	SPAGAIN;
		1593	FREETMPS;
		1594	LEAVE;
		1595	PUTBACK;
		1596	}
		1597
		1598	if (!(coro->flags & CF_RUNNING))
		1599	{
		1600	save_perl (aTHX_ coro);
		1601	load_perl (aTHX_ &temp);
		1602	}
		1603	}
		1604	}
		1605
		1606	SV *
		1607	is_ready (Coro::State coro)
		1608	PROTOTYPE: $
		1609	ALIAS:
		1610	is_ready = CF_READY
		1611	is_running = CF_RUNNING
		1612	is_new = CF_NEW
		1613	is_destroyed = CF_DESTROYED
		1614	CODE:
		1615	RETVAL = boolSV (coro->flags & ix);
		1616	OUTPUT:
		1617	RETVAL
		1618
		1619	void
		1620	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1621
		1622	SV *
		1623	has_stack (Coro::State coro)
		1624	PROTOTYPE: $
		1625	CODE:
		1626	RETVAL = boolSV (!!coro->cctx);
		1627	OUTPUT:
		1628	RETVAL
		1629
		1630	int
		1631	is_traced (Coro::State coro)
		1632	PROTOTYPE: $
		1633	CODE:
		1634	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1635	OUTPUT:
		1636	RETVAL
		1637
		1638	IV
		1639	rss (Coro::State coro)
		1640	PROTOTYPE: $
		1641	ALIAS:
		1642	usecount = 1
1062	CODE:	1643	CODE:
1063	SV *yieldstack;	1644	switch (ix)
1064	SV *sv;	1645	{
1065	AV *defav = GvAV (PL_defgv);	1646	case 0: RETVAL = coro_rss (aTHX_ coro); break;
1066	struct coro *prev, *next;	1647	case 1: RETVAL = coro->usecount; break;
1067
1068	yieldstack = *hv_fetch (
1069	(HV *)SvRV (GvSV (coro_current)),
1070	"yieldstack", sizeof ("yieldstack") - 1,
1071	0	1648	}
1072	);	1649	OUTPUT:
		1650	RETVAL
1073		1651
1074	/* set up @_ -- ugly */
1075	av_clear (defav);
1076	av_fill (defav, items - 1);
1077	while (items--)
1078	av_store (defav, items, SvREFCNT_inc (ST(items)));
1079
1080	sv = av_pop ((AV *)SvRV (yieldstack));
1081	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1082	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1083	SvREFCNT_dec (sv);
1084
1085	transfer (aTHX_ prev, next, 0);
1086		1652
1087	MODULE = Coro::State PACKAGE = Coro	1653	MODULE = Coro::State PACKAGE = Coro
1088		1654
1089	# this is slightly dirty (should expose a c-level api)
1090
1091	BOOT:	1655	BOOT:
1092	{	1656	{
1093	int i;	1657	int i;
		1658
		1659	sv_pool_rss = get_sv ("Coro::POOL_RSS" , TRUE);
		1660	sv_pool_size = get_sv ("Coro::POOL_SIZE" , TRUE);
		1661	av_async_pool = get_av ("Coro::async_pool", TRUE);
		1662
		1663	coro_current = get_sv ("Coro::current", FALSE);
		1664	SvREADONLY_on (coro_current);
		1665
1094	HV *stash = gv_stashpv ("Coro", TRUE);	1666	coro_stash = gv_stashpv ("Coro", TRUE);
1095		1667
1096	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1668	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1097	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1669	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1098	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1670	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1099	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1671	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1100	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1672	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1101	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1673	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1102
1103	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1104	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1105		1674
1106	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1675	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1107	coro_ready[i] = newAV ();	1676	coro_ready[i] = newAV ();
1108		1677
1109	{	1678	{
1110	SV *sv = perl_get_sv("Coro::API", 1);	1679	SV *sv = perl_get_sv("Coro::API", 1);
1111		1680
1112	coroapi.schedule = api_schedule;	1681	coroapi.schedule = api_schedule;
1113	coroapi.cede = api_cede;	1682	coroapi.cede = api_cede;
		1683	coroapi.cede_notself = api_cede_notself;
1114	coroapi.ready = api_ready;	1684	coroapi.ready = api_ready;
		1685	coroapi.is_ready = api_is_ready;
1115	coroapi.nready = &coro_nready;	1686	coroapi.nready = &coro_nready;
1116	coroapi.current = coro_current;	1687	coroapi.current = coro_current;
1117		1688
1118	GCoroAPI = &coroapi;	1689	GCoroAPI = &coroapi;
1119	sv_setiv(sv, (IV)&coroapi);	1690	sv_setiv (sv, (IV)&coroapi);
1120	SvREADONLY_on(sv);	1691	SvREADONLY_on (sv);
1121	}	1692	}
1122	}	1693	}
1123		1694
1124	#if !PERL_MICRO
1125
1126	void	1695	void
1127	ready(self)	1696	_set_current (SV *current)
1128	SV * self
1129	PROTOTYPE: $	1697	PROTOTYPE: $
1130	CODE:	1698	CODE:
1131	api_ready (self);	1699	SvREFCNT_dec (SvRV (coro_current));
1132		1700	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1133	#endif
1134		1701
1135	int	1702	int
		1703	prio (Coro::State coro, int newprio = 0)
		1704	ALIAS:
		1705	nice = 1
		1706	CODE:
		1707	{
		1708	RETVAL = coro->prio;
		1709
		1710	if (items > 1)
		1711	{
		1712	if (ix)
		1713	newprio = coro->prio - newprio;
		1714
		1715	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1716	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1717
		1718	coro->prio = newprio;
		1719	}
		1720	}
		1721	OUTPUT:
		1722	RETVAL
		1723
		1724	SV *
		1725	ready (SV *self)
		1726	PROTOTYPE: $
		1727	CODE:
		1728	RETVAL = boolSV (api_ready (self));
		1729	OUTPUT:
		1730	RETVAL
		1731
		1732	int
1136	nready(...)	1733	nready (...)
1137	PROTOTYPE:	1734	PROTOTYPE:
1138	CODE:	1735	CODE:
1139	RETVAL = coro_nready;	1736	RETVAL = coro_nready;
1140	OUTPUT:	1737	OUTPUT:
1141	RETVAL	1738	RETVAL
1142		1739
1143	void	1740	void
1144	schedule(...)	1741	throw (Coro::State self, SV *throw = &PL_sv_undef)
1145	PROTOTYPE:	1742	PROTOTYPE: $;$
		1743	CODE:
		1744	SvREFCNT_dec (self->throw);
		1745	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1746
		1747	# for async_pool speedup
		1748	void
		1749	_pool_1 (SV *cb)
1146	CODE:	1750	CODE:
1147	api_schedule ();	1751	{
		1752	struct coro *coro = SvSTATE (coro_current);
		1753	HV *hv = (HV *)SvRV (coro_current);
		1754	AV *defav = GvAV (PL_defgv);
		1755	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1756	AV *invoke_av;
		1757	int i, len;
		1758
		1759	if (!invoke)
		1760	croak ("\3terminate\2\n");
		1761
		1762	SvREFCNT_dec (coro->saved_deffh);
		1763	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1764
		1765	hv_store (hv, "desc", sizeof ("desc") - 1,
		1766	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1767
		1768	invoke_av = (AV *)SvRV (invoke);
		1769	len = av_len (invoke_av);
		1770
		1771	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1772
		1773	if (len > 0)
		1774	{
		1775	av_fill (defav, len - 1);
		1776	for (i = 0; i < len; ++i)
		1777	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1778	}
		1779
		1780	SvREFCNT_dec (invoke);
		1781	}
1148		1782
1149	void	1783	void
1150	cede(...)	1784	_pool_2 (SV *cb)
1151	PROTOTYPE:
1152	CODE:	1785	CODE:
1153	api_cede ();	1786	{
		1787	struct coro *coro = SvSTATE (coro_current);
1154		1788
		1789	sv_setsv (cb, &PL_sv_undef);
		1790
		1791	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		1792	coro->saved_deffh = 0;
		1793
		1794	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1795	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1796	croak ("\3terminate\2\n");
		1797
		1798	av_clear (GvAV (PL_defgv));
		1799	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1800	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1801
		1802	coro->prio = 0;
		1803
		1804	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1805	api_trace (coro_current, 0);
		1806
		1807	av_push (av_async_pool, newSVsv (coro_current));
		1808	}
		1809
		1810
		1811	MODULE = Coro::State PACKAGE = Coro::AIO
		1812
		1813	SV *
		1814	_get_state ()
		1815	CODE:
		1816	{
		1817	struct io_state *data;
		1818
		1819	RETVAL = newSV (sizeof (struct io_state));
		1820	data = (struct io_state *)SvPVX (RETVAL);
		1821	SvCUR_set (RETVAL, sizeof (struct io_state));
		1822	SvPOK_only (RETVAL);
		1823
		1824	data->errorno = errno;
		1825	data->laststype = PL_laststype;
		1826	data->laststatval = PL_laststatval;
		1827	data->statcache = PL_statcache;
		1828	}
		1829	OUTPUT:
		1830	RETVAL
		1831
		1832	void
		1833	_set_state (char *data_)
		1834	PROTOTYPE: $
		1835	CODE:
		1836	{
		1837	struct io_state *data = (void *)data_;
		1838
		1839	errno = data->errorno;
		1840	PL_laststype = data->laststype;
		1841	PL_laststatval = data->laststatval;
		1842	PL_statcache = data->statcache;
		1843	}
		1844

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