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Comparing Coro/Coro/State.xs (file contents):
Revision 1.21 by root, Sat Aug 11 19:59:19 2001 UTC vs.
Revision 1.224 by root, Sun Mar 2 16:10:22 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"
6		11
7	#include <signal.h>	12	#include <stdio.h>
		13	#include <errno.h>
		14	#include <assert.h>
		15	#include <inttypes.h> /* portable stdint.h */
8		16
9	#ifdef HAVE_MMAP	17	#ifdef HAVE_MMAP
10	# include <unistd.h>	18	# include <unistd.h>
11	# include <sys/mman.h>	19	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	20	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	21	# ifdef MAP_ANON
		22	# define MAP_ANONYMOUS MAP_ANON
15	# else	23	# else
16	# undef HAVE_MMAP	24	# undef HAVE_MMAP
17	# endif	25	# endif
18	# endif	26	# endif
		27	# include <limits.h>
		28	# ifndef PAGESIZE
		29	# define PAGESIZE pagesize
		30	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		31	static long pagesize;
		32	# else
		33	# define BOOT_PAGESIZE (void)0
19	#endif	34	# endif
20
21	#define MAY_FLUSH /* increases codesize */
22
23	/* perl-related */
24	#define TRANSFER_SAVE_DEFAV 0x00000001
25	#define TRANSFER_SAVE_DEFSV 0x00000002
26	#define TRANSFER_SAVE_ERRSV 0x00000004
27	/* c-related */
28	#define TRANSFER_SAVE_CCTXT 0x00000008
29	#ifdef CORO_LAZY_STACK
30	# define TRANSFER_LAZY_STACK 0x00000010
31	#else	35	#else
32	# 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
33	#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
34		76
35	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	77	/* 5.8.8 */
36	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	78	#ifndef GV_NOTQUAL
		79	# define GV_NOTQUAL 0
		80	#endif
		81	#ifndef newSV
		82	# define newSV(l) NEWSV(0,l)
		83	#endif
37		84
38	#define SUB_INIT "Coro::State::initialize"	85	/* 5.11 */
39	#define UCORO_STATE "_coro_state"	86	#ifndef CxHASARGS
		87	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
		88	#endif
40		89
41	/* The next macro should delcare a variable stacklevel that contains and approximation	90	/* 5.8.7 */
42	* to the current C stack pointer. It's property is that it changes with each call	91	#ifndef SvRV_set
43	* and should be unique. */	92	# define SvRV_set(s,v) SvRV(s) = (v)
		93	#endif
		94
		95	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		96	# undef CORO_STACKGUARD
		97	#endif
		98
		99	#ifndef CORO_STACKGUARD
		100	# define CORO_STACKGUARD 0
		101	#endif
		102
		103	/* prefer perl internal functions over our own? */
		104	#ifndef CORO_PREFER_PERL_FUNCTIONS
		105	# define CORO_PREFER_PERL_FUNCTIONS 0
		106	#endif
		107
		108	/* The next macros try to return the current stack pointer, in an as
		109	* portable way as possible. */
		110	#define dSTACKLEVEL volatile char stacklevel
44	#define dSTACKLEVEL void *stacklevel = &stacklevel	111	#define STACKLEVEL ((void *)&stacklevel)
45		112
46	#define labs(l) ((l) >= 0 ? (l) : -(l))	113	#define IN_DESTRUCT (PL_main_cv == Nullcv)
47		114
48	/* this is actually not only the c stack but also c registers etc... */	115	#if __GNUC__ >= 3
		116	# define attribute(x) __attribute__(x)
		117	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		118	# define expect(expr,value) __builtin_expect ((expr),(value))
		119	#else
		120	# define attribute(x)
		121	# define BARRIER
		122	# define expect(expr,value) (expr)
		123	#endif
		124
		125	#define expect_false(expr) expect ((expr) != 0, 0)
		126	#define expect_true(expr) expect ((expr) != 0, 1)
		127
		128	#define NOINLINE attribute ((noinline))
		129
		130	#include "CoroAPI.h"
		131
		132	#ifdef USE_ITHREADS
		133	static perl_mutex coro_mutex;
		134	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		135	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		136	#else
		137	# define LOCK (void)0
		138	# define UNLOCK (void)0
		139	#endif
		140
		141	/* helper storage struct for Coro::AIO */
		142	struct io_state
		143	{
		144	int errorno;
		145	I32 laststype;
		146	int laststatval;
		147	Stat_t statcache;
		148	};
		149
		150	static size_t coro_stacksize = CORO_STACKSIZE;
		151	static struct CoroAPI coroapi;
		152	static AV *main_mainstack; /* used to differentiate between $main and others */
		153	static JMPENV *main_top_env;
		154	static HV *coro_state_stash, *coro_stash;
		155	static volatile SV *coro_mortal; /* will be freed after next transfer */
		156
		157	static GV *irsgv; /* $/ */
		158	static GV *stdoutgv; /* *STDOUT */
		159	static SV *rv_diehook;
		160	static SV *rv_warnhook;
		161	static HV *hv_sig; /* %SIG */
		162
		163	/* async_pool helper stuff */
		164	static SV *sv_pool_rss;
		165	static SV *sv_pool_size;
		166	static AV *av_async_pool;
		167
		168	static struct coro_cctx *cctx_first;
		169	static int cctx_count, cctx_idle;
		170
		171	enum {
		172	CC_MAPPED = 0x01,
		173	CC_NOREUSE = 0x02, /* throw this away after tracing */
		174	CC_TRACE = 0x04,
		175	CC_TRACE_SUB = 0x08, /* trace sub calls */
		176	CC_TRACE_LINE = 0x10, /* trace each statement */
		177	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		178	};
		179
		180	/* this is a structure representing a c-level coroutine */
		181	typedef struct coro_cctx {
		182	struct coro_cctx *next;
		183
		184	/* the stack */
		185	void *sptr;
		186	size_t ssize;
		187
		188	/* cpu state */
		189	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		190	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		191	JMPENV *top_env;
		192	coro_context cctx;
		193
		194	#if CORO_USE_VALGRIND
		195	int valgrind_id;
		196	#endif
		197	unsigned char flags;
		198	} coro_cctx;
		199
		200	enum {
		201	CF_RUNNING = 0x0001, /* coroutine is running */
		202	CF_READY = 0x0002, /* coroutine is ready */
		203	CF_NEW = 0x0004, /* has never been switched to */
		204	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		205	};
		206
		207	/* the structure where most of the perl state is stored, overlaid on the cxstack */
49	typedef struct {	208	typedef struct {
50	int refcnt; /* pointer reference counter */	209	SV *defsv;
51	int usecnt; /* shared by how many coroutines */	210	AV *defav;
52	int gencnt; /* generation counter */	211	SV *errsv;
		212	SV *irsgv;
		213	#define VAR(name,type) type name;
		214	# include "state.h"
		215	#undef VAR
		216	} perl_slots;
53		217
54	coro_context cctx;	218	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
55		219
56	void *sptr;	220	/* this is a structure representing a perl-level coroutine */
57	long ssize; /* positive == mmap, otherwise malloc */
58	} coro_stack;
59
60	struct coro {	221	struct coro {
61	/* the optional C context */	222	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	223	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65		224
66	/* optionally saved, might be zero */	225	/* process data */
67	AV *defav;
68	SV *defsv;
69	SV *errsv;
70
71	/* saved global state not related to stacks */
72	U8 dowarn;
73	I32 in_eval;
74
75	/* the stacks and related info (callchain etc..) */
76	PERL_SI *curstackinfo;
77	AV *curstack;
78	AV *mainstack;	226	AV *mainstack;
79	SV **stack_sp;	227	perl_slots *slot; /* basically the saved sp */
80	OP *op;
81	SV **curpad;
82	SV **stack_base;
83	SV **stack_max;
84	SV **tmps_stack;
85	I32 tmps_floor;
86	I32 tmps_ix;
87	I32 tmps_max;
88	I32 *markstack;
89	I32 *markstack_ptr;
90	I32 *markstack_max;
91	I32 *scopestack;
92	I32 scopestack_ix;
93	I32 scopestack_max;
94	ANY *savestack;
95	I32 savestack_ix;
96	I32 savestack_max;
97	OP **retstack;
98	I32 retstack_ix;
99	I32 retstack_max;
100	COP *curcop;
101	JMPENV *top_env;
102		228
103	/* data associated with this coroutine (initial args) */	229	AV *args; /* data associated with this coroutine (initial args) */
104	AV *args;	230	int refcnt; /* coroutines are refcounted, yes */
		231	int flags; /* CF_ flags */
		232	HV *hv; /* the perl hash associated with this coro, if any */
		233
		234	/* statistics */
		235	int usecount; /* number of transfers to this coro */
		236
		237	/* coro process data */
		238	int prio;
		239	SV *throw; /* exception to be thrown */
		240
		241	/* async_pool */
		242	SV *saved_deffh;
		243
		244	/* linked list */
		245	struct coro *next, *prev;
105	};	246	};
106		247
107	typedef struct coro *Coro__State;	248	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	249	typedef struct coro *Coro__State_or_hashref;
109		250
110	static AV *main_mainstack; /* used to differentiate between $main and others */	251	/** Coro ********************************************************************/
111	static HV *coro_state_stash;	252
112	static SV *ucoro_state_sv;	253	#define PRIO_MAX 3
113	static U32 ucoro_state_hash;	254	#define PRIO_HIGH 1
114	static HV *padlist_cache;	255	#define PRIO_NORMAL 0
		256	#define PRIO_LOW -1
		257	#define PRIO_IDLE -3
		258	#define PRIO_MIN -4
115		259
116	/* for Coro.pm */	260	/* for Coro.pm */
117	static GV *coro_current, *coro_idle;	261	static SV *coro_current;
		262	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
118	static AV *coro_ready;	263	static int coro_nready;
		264	static struct coro *coro_first;
119		265
120	/* mostly copied from op.c:cv_clone2 */	266	/** lowlevel stuff **********************************************************/
121	STATIC AV *	267
122	clone_padlist (AV *protopadlist)	268	static SV *
		269	coro_get_sv (pTHX_ const char *name, int create)
123	{	270	{
124	AV *av;	271	#if PERL_VERSION_ATLEAST (5,9,0)
125	I32 ix;	272	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
126	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);	273	get_sv (name, create);
127	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);	274	#endif
128	SV **pname = AvARRAY (protopad_name);	275	return get_sv (name, create);
129	SV **ppad = AvARRAY (protopad);	276	}
130	I32 fname = AvFILLp (protopad_name);	277
131	I32 fpad = AvFILLp (protopad);	278	static AV *
		279	coro_get_av (pTHX_ const char *name, int create)
		280	{
		281	#if PERL_VERSION_ATLEAST (5,9,0)
		282	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		283	get_av (name, create);
		284	#endif
		285	return get_av (name, create);
		286	}
		287
		288	static HV *
		289	coro_get_hv (pTHX_ const char *name, int create)
		290	{
		291	#if PERL_VERSION_ATLEAST (5,9,0)
		292	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		293	get_hv (name, create);
		294	#endif
		295	return get_hv (name, create);
		296	}
		297
		298	static AV *
		299	coro_clone_padlist (pTHX_ CV *cv)
		300	{
		301	AV *padlist = CvPADLIST (cv);
132	AV *newpadlist, *newpad_name, *newpad;	302	AV *newpadlist, *newpad;
133	SV **npad;
134
135	newpad_name = newAV ();
136	for (ix = fname; ix >= 0; ix--)
137	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
138
139	newpad = newAV ();
140	av_fill (newpad, AvFILLp (protopad));
141	npad = AvARRAY (newpad);
142		303
143	newpadlist = newAV ();	304	newpadlist = newAV ();
144	AvREAL_off (newpadlist);	305	AvREAL_off (newpadlist);
145	av_store (newpadlist, 0, (SV *) newpad_name);	306	#if PERL_VERSION_ATLEAST (5,9,0)
		307	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		308	#else
		309	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		310	#endif
		311	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		312	--AvFILLp (padlist);
		313
		314	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
146	av_store (newpadlist, 1, (SV *) newpad);	315	av_store (newpadlist, 1, (SV *)newpad);
147		316
148	av = newAV (); /* will be @_ */	317	return newpadlist;
149	av_extend (av, 0);	318	}
150	av_store (newpad, 0, (SV *) av);
151	AvFLAGS (av) = AVf_REIFY;
152		319
153	for (ix = fpad; ix > 0; ix--)	320	static void
		321	free_padlist (pTHX_ AV *padlist)
		322	{
		323	/* may be during global destruction */
		324	if (SvREFCNT (padlist))
154	{	325	{
155	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	326	I32 i = AvFILLp (padlist);
156	if (namesv && namesv != &PL_sv_undef)	327	while (i >= 0)
157	{	328	{
158	char *name = SvPVX (namesv); /* XXX */	329	SV **svp = av_fetch (padlist, i--, FALSE);
159	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	330	if (svp)
160	{ /* lexical from outside? */
161	npad[ix] = SvREFCNT_inc (ppad[ix]);
162	}	331	{
163	else
164	{ /* our own lexical */
165	SV *sv;	332	SV *sv;
166	if (*name == '&')	333	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
167	sv = SvREFCNT_inc (ppad[ix]);	334	SvREFCNT_dec (sv);
168	else if (*name == '@')	335
169	sv = (SV *) newAV ();	336	SvREFCNT_dec (*svp);
170	else if (*name == '%')
171	sv = (SV *) newHV ();
172	else
173	sv = NEWSV (0, 0);
174	if (!SvPADBUSY (sv))
175	SvPADMY_on (sv);
176	npad[ix] = sv;
177	}	337	}
178	}	338	}
179	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
180	{
181	npad[ix] = SvREFCNT_inc (ppad[ix]);
182	}
183	else
184	{
185	SV *sv = NEWSV (0, 0);
186	SvPADTMP_on (sv);
187	npad[ix] = sv;
188	}
189	}
190		339
191	#if 0 /* return -ENOTUNDERSTOOD */
192	/* Now that vars are all in place, clone nested closures. */
193
194	for (ix = fpad; ix > 0; ix--) {
195	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
196	if (namesv
197	&& namesv != &PL_sv_undef
198	&& !(SvFLAGS(namesv) & SVf_FAKE)
199	&& *SvPVX(namesv) == '&'
200	&& CvCLONE(ppad[ix]))
201	{
202	CV *kid = cv_clone((CV*)ppad[ix]);
203	SvREFCNT_dec(ppad[ix]);
204	CvCLONE_on(kid);
205	SvPADMY_on(kid);
206	npad[ix] = (SV*)kid;
207	}
208	}
209	#endif
210
211	return newpadlist;
212	}
213
214	#ifdef MAY_FLUSH
215	STATIC AV *
216	free_padlist (AV *padlist)
217	{
218	/* may be during global destruction */
219	if (SvREFCNT(padlist))
220	{
221	I32 i = AvFILLp(padlist);
222	while (i >= 0)
223	{
224	SV **svp = av_fetch(padlist, i--, FALSE);
225	SV *sv = svp ? *svp : Nullsv;
226	if (sv)
227	SvREFCNT_dec(sv);
228	}
229
230	SvREFCNT_dec((SV*)padlist);	340	SvREFCNT_dec ((SV*)padlist);
231	}	341	}
232	}	342	}
233	#endif	343
		344	static int
		345	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		346	{
		347	AV *padlist;
		348	AV *av = (AV *)mg->mg_obj;
		349
		350	/* casting is fun. */
		351	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		352	free_padlist (aTHX_ padlist);
		353
		354	return 0;
		355	}
		356
		357	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
		358	#define CORO_MAGIC_type_state PERL_MAGIC_ext
		359
		360	static MGVTBL coro_cv_vtbl = {
		361	0, 0, 0, 0,
		362	coro_cv_free
		363	};
		364
		365	#define CORO_MAGIC(sv,type) \
		366	SvMAGIC (sv) \
		367	? SvMAGIC (sv)->mg_type == type \
		368	? SvMAGIC (sv) \
		369	: mg_find (sv, type) \
		370	: 0
		371
		372	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
		373	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
		374
		375	static struct coro *
		376	SvSTATE_ (pTHX_ SV *coro)
		377	{
		378	HV *stash;
		379	MAGIC *mg;
		380
		381	if (SvROK (coro))
		382	coro = SvRV (coro);
		383
		384	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		385	croak ("Coro::State object required");
		386
		387	stash = SvSTASH (coro);
		388	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		389	{
		390	/* very slow, but rare, check */
		391	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		392	croak ("Coro::State object required");
		393	}
		394
		395	mg = CORO_MAGIC_state (coro);
		396	return (struct coro *)mg->mg_ptr;
		397	}
		398
		399	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
234		400
235	/* the next two functions merely cache the padlists */	401	/* the next two functions merely cache the padlists */
236	STATIC void	402	static void
237	get_padlist (CV *cv)	403	get_padlist (pTHX_ CV *cv)
238	{	404	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	405	MAGIC *mg = CORO_MAGIC_cv (cv);
		406	AV *av;
240		407
241	if (he && AvFILLp ((AV *)*he) >= 0)	408	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
242	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	409	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
243	else	410	else
244	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
245	}
246
247	STATIC void
248	put_padlist (CV *cv)
249	{
250	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
251
252	if (SvTYPE (*he) != SVt_PVAV)
253	{	411	{
		412	#if CORO_PREFER_PERL_FUNCTIONS
		413	/* this is probably cleaner, but also slower? */
		414	CV *cp = Perl_cv_clone (cv);
		415	CvPADLIST (cv) = CvPADLIST (cp);
		416	CvPADLIST (cp) = 0;
254	SvREFCNT_dec (*he);	417	SvREFCNT_dec (cp);
255	*he = (SV *)newAV ();	418	#else
		419	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		420	#endif
256	}	421	}
257
258	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
259	}	422	}
260
261	#ifdef MAY_FLUSH
262	STATIC void
263	flush_padlist_cache ()
264	{
265	HV *hv = padlist_cache;
266	padlist_cache = newHV ();
267
268	if (hv_iterinit (hv))
269	{
270	HE *he;
271	AV *padlist;
272
273	while (!!(he = hv_iternext (hv)))
274	{
275	AV *av = (AV *)HeVAL(he);
276
277	/* casting is fun. */
278	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
279	free_padlist (padlist);
280	}
281	}
282
283	SvREFCNT_dec (hv);
284	}
285	#endif
286
287	#define SB do {
288	#define SE } while (0)
289
290	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
291	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
292
293	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
294		423
295	static void	424	static void
		425	put_padlist (pTHX_ CV *cv)
		426	{
		427	MAGIC *mg = CORO_MAGIC_cv (cv);
		428	AV *av;
		429
		430	if (expect_false (!mg))
		431	mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
		432
		433	av = (AV *)mg->mg_obj;
		434
		435	if (expect_false (AvFILLp (av) >= AvMAX (av)))
		436	av_extend (av, AvMAX (av) + 1);
		437
		438	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		439	}
		440
		441	/** load & save, init *******************************************************/
		442
		443	static void
296	load_state(pTHX_ Coro__State c)	444	load_perl (pTHX_ Coro__State c)
297	{	445	{
298	PL_dowarn = c->dowarn;	446	perl_slots *slot = c->slot;
299	PL_in_eval = c->in_eval;	447	c->slot = 0;
300		448
301	PL_curstackinfo = c->curstackinfo;
302	PL_curstack = c->curstack;
303	PL_mainstack = c->mainstack;	449	PL_mainstack = c->mainstack;
304	PL_stack_sp = c->stack_sp;
305	PL_op = c->op;
306	PL_curpad = c->curpad;
307	PL_stack_base = c->stack_base;
308	PL_stack_max = c->stack_max;
309	PL_tmps_stack = c->tmps_stack;
310	PL_tmps_floor = c->tmps_floor;
311	PL_tmps_ix = c->tmps_ix;
312	PL_tmps_max = c->tmps_max;
313	PL_markstack = c->markstack;
314	PL_markstack_ptr = c->markstack_ptr;
315	PL_markstack_max = c->markstack_max;
316	PL_scopestack = c->scopestack;
317	PL_scopestack_ix = c->scopestack_ix;
318	PL_scopestack_max = c->scopestack_max;
319	PL_savestack = c->savestack;
320	PL_savestack_ix = c->savestack_ix;
321	PL_savestack_max = c->savestack_max;
322	PL_retstack = c->retstack;
323	PL_retstack_ix = c->retstack_ix;
324	PL_retstack_max = c->retstack_max;
325	PL_curcop = c->curcop;
326	PL_top_env = c->top_env;
327		450
328	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	451	GvSV (PL_defgv) = slot->defsv;
329	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	452	GvAV (PL_defgv) = slot->defav;
330	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	453	GvSV (PL_errgv) = slot->errsv;
		454	GvSV (irsgv) = slot->irsgv;
		455
		456	#define VAR(name,type) PL_ ## name = slot->name;
		457	# include "state.h"
		458	#undef VAR
331		459
332	{	460	{
333	dSP;	461	dSP;
		462
334	CV *cv;	463	CV *cv;
335		464
336	/* now do the ugly restore mess */	465	/* now do the ugly restore mess */
337	while ((cv = (CV *)POPs))	466	while (expect_true (cv = (CV *)POPs))
338	{	467	{
339	AV *padlist = (AV *)POPs;
340
341	if (padlist)
342	{
343	put_padlist (cv); /* mark this padlist as available */	468	put_padlist (aTHX_ cv); /* mark this padlist as available */
344	CvPADLIST(cv) = padlist;	469	CvDEPTH (cv) = PTR2IV (POPs);
345	#ifdef USE_THREADS	470	CvPADLIST (cv) = (AV *)POPs;
346	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
347	#endif
348	}
349
350	++CvDEPTH(cv);
351	}	471	}
352		472
353	PUTBACK;	473	PUTBACK;
354	}	474	}
355	}	475	}
356		476
357	static void	477	static void
358	save_state(pTHX_ Coro__State c, int flags)	478	save_perl (pTHX_ Coro__State c)
359	{	479	{
360	{	480	{
361	dSP;	481	dSP;
362	I32 cxix = cxstack_ix;	482	I32 cxix = cxstack_ix;
363	PERL_CONTEXT *ccstk = cxstack;	483	PERL_CONTEXT *ccstk = cxstack;
…		…
366	/*	486	/*
367	* the worst thing you can imagine happens first - we have to save	487	* the worst thing you can imagine happens first - we have to save
368	* (and reinitialize) all cv's in the whole callchain :(	488	* (and reinitialize) all cv's in the whole callchain :(
369	*/	489	*/
370		490
371	PUSHs (Nullsv);	491	XPUSHs (Nullsv);
372	/* this loop was inspired by pp_caller */	492	/* this loop was inspired by pp_caller */
373	for (;;)	493	for (;;)
374	{	494	{
375	do	495	while (expect_true (cxix >= 0))
376	{	496	{
377	PERL_CONTEXT *cx = &ccstk[cxix--];	497	PERL_CONTEXT *cx = &ccstk[cxix--];
378		498
379	if (CxTYPE(cx) == CXt_SUB)	499	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
380	{	500	{
381	CV *cv = cx->blk_sub.cv;	501	CV *cv = cx->blk_sub.cv;
		502
382	if (CvDEPTH(cv))	503	if (expect_true (CvDEPTH (cv)))
383	{	504	{
384	#ifdef USE_THREADS
385	/*XPUSHs ((SV *)CvOWNER(cv));*/
386	/*CvOWNER(cv) = 0;*/
387	/*error must unlock this cv etc.. etc...*/
388	#endif
389	EXTEND (SP, CvDEPTH(cv)*2);	505	EXTEND (SP, 3);
390
391	while (--CvDEPTH(cv))
392	{
393	/* this tells the restore code to increment CvDEPTH */
394	PUSHs (Nullsv);
395	PUSHs ((SV *)cv);
396	}
397
398	PUSHs ((SV *)CvPADLIST(cv));	506	PUSHs ((SV *)CvPADLIST (cv));
		507	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
399	PUSHs ((SV *)cv);	508	PUSHs ((SV *)cv);
400		509
401	get_padlist (cv); /* this is a monster */	510	CvDEPTH (cv) = 0;
		511	get_padlist (aTHX_ cv);
402	}	512	}
403	}	513	}
404	else if (CxTYPE(cx) == CXt_FORMAT)
405	{
406	/* I never used formats, so how should I know how these are implemented? */
407	/* my bold guess is as a simple, plain sub... */
408	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
409	}
410	}	514	}
411	while (cxix >= 0);
412		515
413	if (top_si->si_type == PERLSI_MAIN)	516	if (expect_true (top_si->si_type == PERLSI_MAIN))
414	break;	517	break;
415		518
416	top_si = top_si->si_prev;	519	top_si = top_si->si_prev;
417	ccstk = top_si->si_cxstack;	520	ccstk = top_si->si_cxstack;
418	cxix = top_si->si_cxix;	521	cxix = top_si->si_cxix;
419	}	522	}
420		523
421	PUTBACK;	524	PUTBACK;
422	}	525	}
423		526
424	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	527	/* allocate some space on the context stack for our purposes */
425	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	528	/* we manually unroll here, as usually 2 slots is enough */
426	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	529	if (SLOT_COUNT >= 1) CXINC;
		530	if (SLOT_COUNT >= 2) CXINC;
		531	if (SLOT_COUNT >= 3) CXINC;
		532	{
		533	int i;
		534	for (i = 3; i < SLOT_COUNT; ++i)
		535	CXINC;
		536	}
		537	cxstack_ix -= SLOT_COUNT; /* undo allocation */
427		538
428	/* I have not the slightest idea of why av_reify is necessary */
429	/* but if it's missing the defav contents magically get replaced sometimes */
430	if (c->defav)
431	av_reify (c->defav);
432
433	c->dowarn = PL_dowarn;
434	c->in_eval = PL_in_eval;
435
436	c->curstackinfo = PL_curstackinfo;
437	c->curstack = PL_curstack;
438	c->mainstack = PL_mainstack;	539	c->mainstack = PL_mainstack;
439	c->stack_sp = PL_stack_sp;	540
440	c->op = PL_op;	541	{
441	c->curpad = PL_curpad;	542	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
442	c->stack_base = PL_stack_base;	543
443	c->stack_max = PL_stack_max;	544	slot->defav = GvAV (PL_defgv);
444	c->tmps_stack = PL_tmps_stack;	545	slot->defsv = DEFSV;
445	c->tmps_floor = PL_tmps_floor;	546	slot->errsv = ERRSV;
446	c->tmps_ix = PL_tmps_ix;	547	slot->irsgv = GvSV (irsgv);
447	c->tmps_max = PL_tmps_max;	548
448	c->markstack = PL_markstack;	549	#define VAR(name,type) slot->name = PL_ ## name;
449	c->markstack_ptr = PL_markstack_ptr;	550	# include "state.h"
450	c->markstack_max = PL_markstack_max;	551	#undef VAR
451	c->scopestack = PL_scopestack;	552	}
452	c->scopestack_ix = PL_scopestack_ix;
453	c->scopestack_max = PL_scopestack_max;
454	c->savestack = PL_savestack;
455	c->savestack_ix = PL_savestack_ix;
456	c->savestack_max = PL_savestack_max;
457	c->retstack = PL_retstack;
458	c->retstack_ix = PL_retstack_ix;
459	c->retstack_max = PL_retstack_max;
460	c->curcop = PL_curcop;
461	c->top_env = PL_top_env;
462	}	553	}
463		554
464	/*	555	/*
465	* allocate various perl stacks. This is an exact copy	556	* allocate various perl stacks. This is an exact copy
466	* of perl.c:init_stacks, except that it uses less memory	557	* of perl.c:init_stacks, except that it uses less memory
467	* on the assumption that coroutines do not usually need	558	* on the (sometimes correct) assumption that coroutines do
468	* a lot of stackspace.	559	* not usually need a lot of stackspace.
469	*/	560	*/
470	STATIC void	561	#if CORO_PREFER_PERL_FUNCTIONS
		562	# define coro_init_stacks init_stacks
		563	#else
		564	static void
471	coro_init_stacks (pTHX)	565	coro_init_stacks (pTHX)
472	{	566	{
473	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	567	PL_curstackinfo = new_stackinfo(32, 8);
474	PL_curstackinfo->si_type = PERLSI_MAIN;	568	PL_curstackinfo->si_type = PERLSI_MAIN;
475	PL_curstack = PL_curstackinfo->si_stack;	569	PL_curstack = PL_curstackinfo->si_stack;
476	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	570	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
477		571
478	PL_stack_base = AvARRAY(PL_curstack);	572	PL_stack_base = AvARRAY(PL_curstack);
479	PL_stack_sp = PL_stack_base;	573	PL_stack_sp = PL_stack_base;
480	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	574	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
481		575
482	New(50,PL_tmps_stack,96,SV*);	576	New(50,PL_tmps_stack,32,SV*);
483	PL_tmps_floor = -1;	577	PL_tmps_floor = -1;
484	PL_tmps_ix = -1;	578	PL_tmps_ix = -1;
485	PL_tmps_max = 96;	579	PL_tmps_max = 32;
486		580
487	New(54,PL_markstack,16,I32);	581	New(54,PL_markstack,16,I32);
488	PL_markstack_ptr = PL_markstack;	582	PL_markstack_ptr = PL_markstack;
489	PL_markstack_max = PL_markstack + 16;	583	PL_markstack_max = PL_markstack + 16;
490		584
		585	#ifdef SET_MARK_OFFSET
491	SET_MARK_OFFSET;	586	SET_MARK_OFFSET;
		587	#endif
492		588
493	New(54,PL_scopestack,16,I32);	589	New(54,PL_scopestack,8,I32);
494	PL_scopestack_ix = 0;	590	PL_scopestack_ix = 0;
495	PL_scopestack_max = 16;	591	PL_scopestack_max = 8;
496		592
497	New(54,PL_savestack,96,ANY);	593	New(54,PL_savestack,24,ANY);
498	PL_savestack_ix = 0;	594	PL_savestack_ix = 0;
499	PL_savestack_max = 96;	595	PL_savestack_max = 24;
500		596
		597	#if !PERL_VERSION_ATLEAST (5,9,0)
501	New(54,PL_retstack,8,OP*);	598	New(54,PL_retstack,4,OP*);
502	PL_retstack_ix = 0;	599	PL_retstack_ix = 0;
503	PL_retstack_max = 8;	600	PL_retstack_max = 4;
		601	#endif
504	}	602	}
		603	#endif
505		604
506	/*	605	/*
507	* destroy the stacks, the callchain etc...	606	* destroy the stacks, the callchain etc...
508	* still there is a memleak of 128 bytes...
509	*/	607	*/
510	STATIC void	608	static void
511	destroy_stacks(pTHX)	609	coro_destroy_stacks (pTHX)
512	{	610	{
513	/* is this ugly, I ask? */
514	while (PL_scopestack_ix)
515	LEAVE;
516
517	/* sure it is, but more important: is it correct?? :/ */
518	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
519	FREETMPS;
520
521	while (PL_curstackinfo->si_next)	611	while (PL_curstackinfo->si_next)
522	PL_curstackinfo = PL_curstackinfo->si_next;	612	PL_curstackinfo = PL_curstackinfo->si_next;
523		613
524	while (PL_curstackinfo)	614	while (PL_curstackinfo)
525	{	615	{
526	PERL_SI *p = PL_curstackinfo->si_prev;	616	PERL_SI *p = PL_curstackinfo->si_prev;
527		617
528	{	618	if (!IN_DESTRUCT)
529	dSP;
530	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
531	PUTBACK; /* possibly superfluous */
532	}
533
534	dounwind(-1);
535
536	SvREFCNT_dec(PL_curstackinfo->si_stack);	619	SvREFCNT_dec (PL_curstackinfo->si_stack);
		620
537	Safefree(PL_curstackinfo->si_cxstack);	621	Safefree (PL_curstackinfo->si_cxstack);
538	Safefree(PL_curstackinfo);	622	Safefree (PL_curstackinfo);
539	PL_curstackinfo = p;	623	PL_curstackinfo = p;
540	}	624	}
541		625
542	Safefree(PL_tmps_stack);	626	Safefree (PL_tmps_stack);
543	Safefree(PL_markstack);	627	Safefree (PL_markstack);
544	Safefree(PL_scopestack);	628	Safefree (PL_scopestack);
545	Safefree(PL_savestack);	629	Safefree (PL_savestack);
		630	#if !PERL_VERSION_ATLEAST (5,9,0)
546	Safefree(PL_retstack);	631	Safefree (PL_retstack);
		632	#endif
		633	}
		634
		635	static size_t
		636	coro_rss (pTHX_ struct coro *coro)
		637	{
		638	size_t rss = sizeof (*coro);
		639
		640	if (coro->mainstack)
		641	{
		642	perl_slots tmp_slot;
		643	perl_slots *slot;
		644
		645	if (coro->flags & CF_RUNNING)
		646	{
		647	slot = &tmp_slot;
		648
		649	#define VAR(name,type) slot->name = PL_ ## name;
		650	# include "state.h"
		651	#undef VAR
		652	}
		653	else
		654	slot = coro->slot;
		655
		656	rss += sizeof (slot->curstackinfo);
		657	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		658	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		659	rss += slot->tmps_max * sizeof (SV *);
		660	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		661	rss += slot->scopestack_max * sizeof (I32);
		662	rss += slot->savestack_max * sizeof (ANY);
		663
		664	#if !PERL_VERSION_ATLEAST (5,9,0)
		665	rss += slot->retstack_max * sizeof (OP *);
		666	#endif
		667	}
		668
		669	return rss;
		670	}
		671
		672	/** coroutine stack handling ************************************************/
		673
		674	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
		675	static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
		676
		677	/*
		678	* This overrides the default magic get method of %SIG elements.
		679	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
		680	* and instead of tryign to save and restore the hash elements, we just provide
		681	* readback here.
		682	* We only do this when the hook is != 0, as they are often set to 0 temporarily,
		683	* not expecting this to actually change the hook. This is a potential problem
		684	* when a schedule happens then, but we ignore this.
		685	*/
		686	static int
		687	coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
		688	{
		689	const char *s = MgPV_nolen_const (mg);
		690
		691	if (*s == '_')
		692	{
		693	if (strEQ (s, "__DIE__" ) && PL_diehook ) return sv_setsv (sv, PL_diehook ), 0;
		694	if (strEQ (s, "__WARN__") && PL_warnhook) return sv_setsv (sv, PL_warnhook), 0;
		695	}
		696
		697	return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
		698	}
		699
		700	static int
		701	coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
		702	{
		703	const char *s = MgPV_nolen_const (mg);
		704
		705	if (*s == '_')
		706	{
		707	SV **svp = 0;
		708
		709	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		710	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		711
		712	if (svp)
		713	{
		714	SV *old = *svp;
		715	*svp = newSVsv (sv);
		716	SvREFCNT_dec (old);
		717	return;
		718	}
		719	}
		720
		721	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
547	}	722	}
548		723
549	static void	724	static void
550	allocate_stack (Coro__State ctx, int alloc)	725	coro_setup (pTHX_ struct coro *coro)
551	{
552	coro_stack *stack;
553
554	New (0, stack, 1, coro_stack);
555
556	stack->refcnt = 1;
557	stack->usecnt = 1;
558	stack->gencnt = ctx->gencnt = 0;
559	if (alloc)
560	{
561	#ifdef HAVE_MMAP
562	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
563	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
564	if (stack->sptr == (void *)-1)
565	#endif
566	{
567	/*FIXME*//*D*//* reasonable stack size! */
568	stack->ssize = -4096 * sizeof (long);
569	New (0, stack->sptr, 4096, long);
570	}
571	}
572	else
573	stack->sptr = 0;
574
575	ctx->stack = stack;
576	}
577
578	static void
579	deallocate_stack (Coro__State ctx)
580	{
581	coro_stack *stack = ctx->stack;
582
583	ctx->stack = 0;
584
585	if (stack)
586	{
587	if (!--stack->refcnt)
588	{
589	#ifdef HAVE_MMAP
590	if (stack->ssize > 0 && stack->sptr)
591	munmap (stack->sptr, stack->ssize);
592	else
593	#else
594	Safefree (stack->sptr);
595	#endif
596	Safefree (stack);
597	}
598	else if (ctx->gencnt == stack->gencnt)
599	--stack->usecnt;
600	}
601	}
602
603	static void
604	setup_coro (void *arg)
605	{	726	{
606	/*	727	/*
607	* emulate part of the perl startup here.	728	* emulate part of the perl startup here.
608	*/	729	*/
609	dSP;
610	Coro__State ctx = (Coro__State)arg;
611	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
612
613	coro_init_stacks (aTHX);	730	coro_init_stacks (aTHX);
614	/*PL_curcop = 0;*/	731
615	/*PL_in_eval = PL_in_eval;*/ /* inherit */	732	PL_runops = RUNOPS_DEFAULT;
		733	PL_curcop = &PL_compiling;
		734	PL_in_eval = EVAL_NULL;
		735	PL_comppad = 0;
		736	PL_curpm = 0;
		737	PL_curpad = 0;
		738	PL_localizing = 0;
		739	PL_dirty = 0;
		740	PL_restartop = 0;
		741
		742	/* recreate the die/warn hooks */
		743	PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
		744	PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
		745
		746	GvSV (PL_defgv) = newSV (0);
		747	GvAV (PL_defgv) = coro->args; coro->args = 0;
		748	GvSV (PL_errgv) = newSV (0);
		749	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		750	PL_rs = newSVsv (GvSV (irsgv));
		751	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		752
		753	{
		754	dSP;
		755	LOGOP myop;
		756
		757	Zero (&myop, 1, LOGOP);
		758	myop.op_next = Nullop;
		759	myop.op_flags = OPf_WANT_VOID;
		760
		761	PUSHMARK (SP);
		762	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		763	PUTBACK;
		764	PL_op = (OP *)&myop;
		765	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		766	SPAGAIN;
		767	}
		768
		769	/* this newly created coroutine might be run on an existing cctx which most
		770	* likely was suspended in set_stacklevel, called from entersub.
		771	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		772	* so we ENTER here for symmetry
		773	*/
		774	ENTER;
		775	}
		776
		777	static void
		778	coro_destroy (pTHX_ struct coro *coro)
		779	{
		780	if (!IN_DESTRUCT)
		781	{
		782	/* restore all saved variables and stuff */
		783	LEAVE_SCOPE (0);
		784	assert (PL_tmps_floor == -1);
		785
		786	/* free all temporaries */
		787	FREETMPS;
		788	assert (PL_tmps_ix == -1);
		789
		790	/* unwind all extra stacks */
		791	POPSTACK_TO (PL_mainstack);
		792
		793	/* unwind main stack */
		794	dounwind (-1);
		795	}
		796
		797	SvREFCNT_dec (GvSV (PL_defgv));
616	SvREFCNT_dec (GvAV (PL_defgv));	798	SvREFCNT_dec (GvAV (PL_defgv));
617	GvAV (PL_defgv) = ctx->args;	799	SvREFCNT_dec (GvSV (PL_errgv));
		800	SvREFCNT_dec (PL_defoutgv);
		801	SvREFCNT_dec (PL_rs);
		802	SvREFCNT_dec (GvSV (irsgv));
618		803
619	SPAGAIN;	804	SvREFCNT_dec (PL_diehook);
		805	SvREFCNT_dec (PL_warnhook);
		806
		807	SvREFCNT_dec (coro->saved_deffh);
		808	SvREFCNT_dec (coro->throw);
620		809
621	if (ctx->stack)	810	coro_destroy_stacks (aTHX);
622	{
623	ctx->cursp = 0;
624
625	PUSHMARK(SP);
626	PUTBACK;
627	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
628
629	if (SvTRUE (ERRSV))
630	croak (NULL);
631	else
632	croak ("FATAL: CCTXT coroutine returned!");
633	}
634	else
635	{
636	UNOP myop;
637
638	PL_op = (OP *)&myop;
639
640	Zero(&myop, 1, UNOP);
641	myop.op_next = Nullop;
642	myop.op_flags = OPf_WANT_VOID;
643
644	PUSHMARK(SP);
645	XPUSHs (sub_init);
646	/*
647	* the next line is slightly wrong, as PL_op->op_next
648	* is actually being executed so we skip the first op.
649	* that doesn't matter, though, since it is only
650	* pp_nextstate and we never return...
651	* ah yes, and I don't care anyways ;)
652	*/
653	PUTBACK;
654	PL_op = pp_entersub();
655	SPAGAIN;
656
657	ENTER; /* necessary e.g. for dounwind */
658	}
659	}	811	}
660		812
661	static void	813	static void
662	continue_coro (void *arg)	814	free_coro_mortal (pTHX)
663	{	815	{
664	/*	816	if (expect_true (coro_mortal))
665	* this is a _very_ stripped down perl interpreter ;)	817	{
666	*/	818	SvREFCNT_dec (coro_mortal);
667	Coro__State ctx = (Coro__State)arg;	819	coro_mortal = 0;
668
669	/*FIXME*//* must set up top_env here */
670	ctx->cursp = 0;
671	PL_op = PL_op->op_next;
672	CALLRUNOPS(aTHX);
673
674	abort ();
675	}
676
677	STATIC void
678	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
679	{
680	dSP;
681	dSTACKLEVEL;
682
683	if (prev != next)
684	{	820	}
685	if (next->mainstack)	821	}
		822
		823	static int
		824	runops_trace (pTHX)
		825	{
		826	COP *oldcop = 0;
		827	int oldcxix = -2;
		828	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		829	coro_cctx *cctx = coro->cctx;
		830
		831	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		832	{
		833	PERL_ASYNC_CHECK ();
		834
		835	if (cctx->flags & CC_TRACE_ALL)
686	{	836	{
687	SAVE (prev, flags);	837	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
688	LOAD (next);
689
690	/* mark this state as in-use */
691	next->mainstack = 0;
692	next->tmps_ix = -2;
693
694	/* stacklevel changed? if yes, grab the stack for us! */
695	if (flags & TRANSFER_SAVE_CCTXT)
696	{	838	{
697	if (!prev->stack)	839	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
698	allocate_stack (prev, 0);	840	SV **bot, **top;
699	else if (prev->cursp != stacklevel	841	AV *av = newAV (); /* return values */
700	&& prev->stack->usecnt > 1)	842	SV **cb;
		843	dSP;
		844
		845	GV *gv = CvGV (cx->blk_sub.cv);
		846	SV *fullname = sv_2mortal (newSV (0));
		847	if (isGV (gv))
		848	gv_efullname3 (fullname, gv, 0);
		849
		850	bot = PL_stack_base + cx->blk_oldsp + 1;
		851	top = cx->blk_gimme == G_ARRAY ? SP + 1
		852	: cx->blk_gimme == G_SCALAR ? bot + 1
		853	: bot;
		854
		855	av_extend (av, top - bot);
		856	while (bot < top)
		857	av_push (av, SvREFCNT_inc (*bot++));
		858
		859	PL_runops = RUNOPS_DEFAULT;
		860	ENTER;
		861	SAVETMPS;
		862	EXTEND (SP, 3);
		863	PUSHMARK (SP);
		864	PUSHs (&PL_sv_no);
		865	PUSHs (fullname);
		866	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		867	PUTBACK;
		868	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		869	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		870	SPAGAIN;
		871	FREETMPS;
		872	LEAVE;
		873	PL_runops = runops_trace;
		874	}
		875
		876	if (oldcop != PL_curcop)
		877	{
		878	oldcop = PL_curcop;
		879
		880	if (PL_curcop != &PL_compiling)
701	{	881	{
702	prev->gencnt = ++prev->stack->gencnt;	882	SV **cb;
703	prev->stack->usecnt = 1;
704	}
705		883
706	/* has our stack been invalidated? */	884	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
707	if (next->stack && next->stack->gencnt != next->gencnt)
708	{	885	{
709	deallocate_stack (next);	886	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
710	allocate_stack (next, 1);	887
711	coro_create (&(next->stack->cctx),	888	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
712	continue_coro, (void *)next,	889	{
713	next->stack->sptr, labs (next->stack->ssize));	890	runops_proc_t old_runops = PL_runops;
		891	dSP;
		892	GV *gv = CvGV (cx->blk_sub.cv);
		893	SV *fullname = sv_2mortal (newSV (0));
		894
		895	if (isGV (gv))
		896	gv_efullname3 (fullname, gv, 0);
		897
		898	PL_runops = RUNOPS_DEFAULT;
		899	ENTER;
		900	SAVETMPS;
		901	EXTEND (SP, 3);
		902	PUSHMARK (SP);
		903	PUSHs (&PL_sv_yes);
		904	PUSHs (fullname);
		905	PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		906	PUTBACK;
		907	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		908	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		909	SPAGAIN;
		910	FREETMPS;
		911	LEAVE;
		912	PL_runops = runops_trace;
		913	}
		914
		915	oldcxix = cxstack_ix;
714	}	916	}
715		917
716	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));	918	if (cctx->flags & CC_TRACE_LINE)
717	}
718
719	}
720	else if (next->tmps_ix == -2)
721	croak ("tried to transfer to running coroutine");
722	else
723	{
724	SAVE (prev, -1); /* first get rid of the old state */
725
726	if (flags & TRANSFER_SAVE_CCTXT)
727	{
728	if (!prev->stack)
729	allocate_stack (prev, 0);
730
731	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
732	{	919	{
733	setup_coro (next);	920	dSP;
734		921
735	prev->stack->refcnt++;	922	PL_runops = RUNOPS_DEFAULT;
736	prev->stack->usecnt++;	923	ENTER;
737	next->stack = prev->stack;	924	SAVETMPS;
738	next->gencnt = prev->gencnt;	925	EXTEND (SP, 3);
		926	PL_runops = RUNOPS_DEFAULT;
		927	PUSHMARK (SP);
		928	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		929	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		930	PUTBACK;
		931	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		932	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		933	SPAGAIN;
		934	FREETMPS;
		935	LEAVE;
		936	PL_runops = runops_trace;
739	}	937	}
740	else
741	{
742	allocate_stack (next, 1);
743	coro_create (&(next->stack->cctx),
744	setup_coro, (void *)next,
745	next->stack->sptr, labs (next->stack->ssize));
746	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
747	}	938	}
748	}	939	}
749	else
750	setup_coro (next);
751	}	940	}
752	}	941	}
753		942
754	next->cursp = stacklevel;	943	TAINT_NOT;
		944	return 0;
755	}	945	}
756		946
757	static struct coro *	947	/* inject a fake call to Coro::State::_cctx_init into the execution */
758	sv_to_coro (SV *arg, const char *funcname, const char *varname)	948	/* _cctx_init should be careful, as it could be called at almost any time */
		949	/* during execution of a perl program */
		950	static void NOINLINE
		951	cctx_prepare (pTHX_ coro_cctx *cctx)
759	{	952	{
760	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	953	dSP;
		954	LOGOP myop;
		955
		956	PL_top_env = &PL_start_env;
		957
		958	if (cctx->flags & CC_TRACE)
		959	PL_runops = runops_trace;
		960
		961	Zero (&myop, 1, LOGOP);
		962	myop.op_next = PL_op;
		963	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		964
		965	PUSHMARK (SP);
		966	EXTEND (SP, 2);
		967	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		968	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		969	PUTBACK;
		970	PL_op = (OP *)&myop;
		971	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		972	SPAGAIN;
		973	}
		974
		975	/*
		976	* this is a _very_ stripped down perl interpreter ;)
		977	*/
		978	static void
		979	cctx_run (void *arg)
		980	{
		981	dTHX;
		982
		983	/* cctx_run is the alternative tail of transfer(), so unlock here. */
		984	UNLOCK;
		985
		986	/* we now skip the entersub that lead to transfer() */
		987	PL_op = PL_op->op_next;
		988
		989	/* inject a fake subroutine call to cctx_init */
		990	cctx_prepare (aTHX_ (coro_cctx *)arg);
		991
		992	/* somebody or something will hit me for both perl_run and PL_restartop */
		993	PL_restartop = PL_op;
		994	perl_run (PL_curinterp);
		995
		996	/*
		997	* If perl-run returns we assume exit() was being called or the coro
		998	* fell off the end, which seems to be the only valid (non-bug)
		999	* reason for perl_run to return. We try to exit by jumping to the
		1000	* bootstrap-time "top" top_env, as we cannot restore the "main"
		1001	* coroutine as Coro has no such concept
		1002	*/
		1003	PL_top_env = main_top_env;
		1004	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		1005	}
		1006
		1007	static coro_cctx *
		1008	cctx_new ()
		1009	{
		1010	coro_cctx *cctx;
		1011	void *stack_start;
		1012	size_t stack_size;
		1013
		1014	++cctx_count;
		1015
		1016	Newz (0, cctx, 1, coro_cctx);
		1017
		1018	#if HAVE_MMAP
		1019	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		1020	/* mmap supposedly does allocate-on-write for us */
		1021	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		1022
		1023	if (cctx->sptr != (void *)-1)
761	{	1024	{
762	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	1025	# if CORO_STACKGUARD
763		1026	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
764	if (!he)	1027	# endif
765	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);	1028	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
766		1029	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
767	arg = HeVAL(he);	1030	cctx->flags |= CC_MAPPED;
768	}	1031	}
769
770	/* must also be changed inside Coro::Cont::yield */
771	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
772	return (struct coro *) SvIV((SV*)SvRV(arg));
773	else	1032	else
774	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	1033	#endif
775	}	1034	{
		1035	cctx->ssize = coro_stacksize * (long)sizeof (long);
		1036	New (0, cctx->sptr, coro_stacksize, long);
776		1037
		1038	if (!cctx->sptr)
		1039	{
		1040	perror ("FATAL: unable to allocate stack for coroutine");
		1041	_exit (EXIT_FAILURE);
		1042	}
		1043
		1044	stack_start = cctx->sptr;
		1045	stack_size = cctx->ssize;
		1046	}
		1047
		1048	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1049	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
		1050
		1051	return cctx;
		1052	}
		1053
		1054	static void
		1055	cctx_destroy (coro_cctx *cctx)
		1056	{
		1057	if (!cctx)
		1058	return;
		1059
		1060	--cctx_count;
		1061
		1062	#if CORO_USE_VALGRIND
		1063	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		1064	#endif
		1065
		1066	#if HAVE_MMAP
		1067	if (cctx->flags & CC_MAPPED)
		1068	munmap (cctx->sptr, cctx->ssize);
		1069	else
		1070	#endif
		1071	Safefree (cctx->sptr);
		1072
		1073	Safefree (cctx);
		1074	}
		1075
		1076	/* wether this cctx should be destructed */
		1077	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1078
		1079	static coro_cctx *
		1080	cctx_get (pTHX)
		1081	{
		1082	while (expect_true (cctx_first))
		1083	{
		1084	coro_cctx *cctx = cctx_first;
		1085	cctx_first = cctx->next;
		1086	--cctx_idle;
		1087
		1088	if (expect_true (!CCTX_EXPIRED (cctx)))
		1089	return cctx;
		1090
		1091	cctx_destroy (cctx);
		1092	}
		1093
		1094	return cctx_new ();
		1095	}
		1096
		1097	static void
		1098	cctx_put (coro_cctx *cctx)
		1099	{
		1100	/* free another cctx if overlimit */
		1101	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		1102	{
		1103	coro_cctx *first = cctx_first;
		1104	cctx_first = first->next;
		1105	--cctx_idle;
		1106
		1107	cctx_destroy (first);
		1108	}
		1109
		1110	++cctx_idle;
		1111	cctx->next = cctx_first;
		1112	cctx_first = cctx;
		1113	}
		1114
		1115	/** coroutine switching *****************************************************/
		1116
		1117	static void
		1118	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1119	{
		1120	if (expect_true (prev != next))
		1121	{
		1122	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1123	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1124
		1125	if (expect_false (next->flags & CF_RUNNING))
		1126	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1127
		1128	if (expect_false (next->flags & CF_DESTROYED))
		1129	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1130
		1131	if (
		1132	#if PERL_VERSION_ATLEAST (5,9,0)
		1133	expect_false (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
		1134	#else
		1135	expect_false (PL_lex_state != LEX_NOTPARSING)
		1136	#endif
		1137	)
		1138	croak ("Coro::State::transfer called while parsing, but this is not supported");
		1139	}
		1140	}
		1141
		1142	/* always use the TRANSFER macro */
		1143	static void NOINLINE
		1144	transfer (pTHX_ struct coro *prev, struct coro *next)
		1145	{
		1146	dSTACKLEVEL;
		1147	static volatile int has_throw;
		1148
		1149	/* sometimes transfer is only called to set idle_sp */
		1150	if (expect_false (!next))
		1151	{
		1152	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1153	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		1154	}
		1155	else if (expect_true (prev != next))
		1156	{
		1157	coro_cctx *prev__cctx;
		1158
		1159	if (expect_false (prev->flags & CF_NEW))
		1160	{
		1161	/* create a new empty context */
		1162	Newz (0, prev->cctx, 1, coro_cctx);
		1163	prev->flags &= ~CF_NEW;
		1164	prev->flags |= CF_RUNNING;
		1165	}
		1166
		1167	prev->flags &= ~CF_RUNNING;
		1168	next->flags |= CF_RUNNING;
		1169
		1170	LOCK;
		1171
		1172	/* first get rid of the old state */
		1173	save_perl (aTHX_ prev);
		1174
		1175	if (expect_false (next->flags & CF_NEW))
		1176	{
		1177	/* need to start coroutine */
		1178	next->flags &= ~CF_NEW;
		1179	/* setup coroutine call */
		1180	coro_setup (aTHX_ next);
		1181	}
		1182	else
		1183	load_perl (aTHX_ next);
		1184
		1185	prev__cctx = prev->cctx;
		1186
		1187	/* possibly "free" the cctx */
		1188	if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
		1189	{
		1190	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1191	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1192
		1193	prev->cctx = 0;
		1194
		1195	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1196	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1197	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1198	if (!next->cctx)
		1199	next->cctx = cctx_get (aTHX);
		1200
		1201	cctx_put (prev__cctx);
		1202	}
		1203
		1204	++next->usecount;
		1205
		1206	if (expect_true (!next->cctx))
		1207	next->cctx = cctx_get (aTHX);
		1208
		1209	has_throw = !!next->throw;
		1210
		1211	if (expect_false (prev__cctx != next->cctx))
		1212	{
		1213	prev__cctx->top_env = PL_top_env;
		1214	PL_top_env = next->cctx->top_env;
		1215	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1216	}
		1217
		1218	free_coro_mortal (aTHX);
		1219	UNLOCK;
		1220
		1221	if (expect_false (has_throw))
		1222	{
		1223	struct coro *coro = SvSTATE (coro_current);
		1224
		1225	if (coro->throw)
		1226	{
		1227	SV *exception = coro->throw;
		1228	coro->throw = 0;
		1229	sv_setsv (ERRSV, exception);
		1230	croak (0);
		1231	}
		1232	}
		1233	}
		1234	}
		1235
		1236	struct transfer_args
		1237	{
		1238	struct coro *prev, *next;
		1239	};
		1240
		1241	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1242	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1243
		1244	/** high level stuff ********************************************************/
		1245
		1246	static int
		1247	coro_state_destroy (pTHX_ struct coro *coro)
		1248	{
		1249	if (coro->flags & CF_DESTROYED)
		1250	return 0;
		1251
		1252	coro->flags |= CF_DESTROYED;
		1253
		1254	if (coro->flags & CF_READY)
		1255	{
		1256	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1257	/* alternative: look through all ready queues and remove the coro */
		1258	LOCK;
		1259	--coro_nready;
		1260	UNLOCK;
		1261	}
		1262	else
		1263	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
		1264
		1265	if (coro->mainstack && coro->mainstack != main_mainstack)
		1266	{
		1267	struct coro temp;
		1268
		1269	if (coro->flags & CF_RUNNING)
		1270	croak ("FATAL: tried to destroy currently running coroutine");
		1271
		1272	save_perl (aTHX_ &temp);
		1273	load_perl (aTHX_ coro);
		1274
		1275	coro_destroy (aTHX_ coro);
		1276
		1277	load_perl (aTHX_ &temp);
		1278
		1279	coro->slot = 0;
		1280	}
		1281
		1282	cctx_destroy (coro->cctx);
		1283	SvREFCNT_dec (coro->args);
		1284
		1285	if (coro->next) coro->next->prev = coro->prev;
		1286	if (coro->prev) coro->prev->next = coro->next;
		1287	if (coro == coro_first) coro_first = coro->next;
		1288
		1289	return 1;
		1290	}
		1291
		1292	static int
		1293	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1294	{
		1295	struct coro *coro = (struct coro *)mg->mg_ptr;
		1296	mg->mg_ptr = 0;
		1297
		1298	coro->hv = 0;
		1299
		1300	if (--coro->refcnt < 0)
		1301	{
		1302	coro_state_destroy (aTHX_ coro);
		1303	Safefree (coro);
		1304	}
		1305
		1306	return 0;
		1307	}
		1308
		1309	static int
		1310	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1311	{
		1312	struct coro *coro = (struct coro *)mg->mg_ptr;
		1313
		1314	++coro->refcnt;
		1315
		1316	return 0;
		1317	}
		1318
		1319	static MGVTBL coro_state_vtbl = {
		1320	0, 0, 0, 0,
		1321	coro_state_free,
		1322	0,
		1323	#ifdef MGf_DUP
		1324	coro_state_dup,
		1325	#else
		1326	# define MGf_DUP 0
		1327	#endif
		1328	};
		1329
		1330	static void
		1331	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1332	{
		1333	ta->prev = SvSTATE (prev_sv);
		1334	ta->next = SvSTATE (next_sv);
		1335	TRANSFER_CHECK (*ta);
		1336	}
		1337
		1338	static void
		1339	api_transfer (SV *prev_sv, SV *next_sv)
		1340	{
		1341	dTHX;
		1342	struct transfer_args ta;
		1343
		1344	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1345	TRANSFER (ta);
		1346	}
		1347
		1348	/** Coro ********************************************************************/
		1349
		1350	static void
		1351	coro_enq (pTHX_ SV *coro_sv)
		1352	{
		1353	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		1354	}
		1355
		1356	static SV *
		1357	coro_deq (pTHX)
		1358	{
		1359	int prio;
		1360
		1361	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
		1362	if (AvFILLp (coro_ready [prio]) >= 0)
		1363	return av_shift (coro_ready [prio]);
		1364
		1365	return 0;
		1366	}
		1367
		1368	static int
		1369	api_ready (SV *coro_sv)
		1370	{
		1371	dTHX;
		1372	struct coro *coro;
		1373
		1374	if (SvROK (coro_sv))
		1375	coro_sv = SvRV (coro_sv);
		1376
		1377	coro = SvSTATE (coro_sv);
		1378
		1379	if (coro->flags & CF_READY)
		1380	return 0;
		1381
		1382	coro->flags |= CF_READY;
		1383
		1384	LOCK;
		1385	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1386	++coro_nready;
		1387	UNLOCK;
		1388
		1389	return 1;
		1390	}
		1391
		1392	static int
		1393	api_is_ready (SV *coro_sv)
		1394	{
		1395	dTHX;
		1396	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1397	}
		1398
		1399	static void
		1400	prepare_schedule (pTHX_ struct transfer_args *ta)
		1401	{
		1402	SV *prev_sv, *next_sv;
		1403
		1404	for (;;)
		1405	{
		1406	LOCK;
		1407	next_sv = coro_deq (aTHX);
		1408
		1409	/* nothing to schedule: call the idle handler */
		1410	if (expect_false (!next_sv))
		1411	{
		1412	dSP;
		1413	UNLOCK;
		1414
		1415	ENTER;
		1416	SAVETMPS;
		1417
		1418	PUSHMARK (SP);
		1419	PUTBACK;
		1420	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1421	SPAGAIN;
		1422
		1423	FREETMPS;
		1424	LEAVE;
		1425	continue;
		1426	}
		1427
		1428	ta->next = SvSTATE (next_sv);
		1429
		1430	/* cannot transfer to destroyed coros, skip and look for next */
		1431	if (expect_false (ta->next->flags & CF_DESTROYED))
		1432	{
		1433	UNLOCK;
		1434	SvREFCNT_dec (next_sv);
		1435	/* coro_nready is already taken care of by destroy */
		1436	continue;
		1437	}
		1438
		1439	--coro_nready;
		1440	UNLOCK;
		1441	break;
		1442	}
		1443
		1444	/* free this only after the transfer */
		1445	prev_sv = SvRV (coro_current);
		1446	ta->prev = SvSTATE (prev_sv);
		1447	TRANSFER_CHECK (*ta);
		1448	assert (ta->next->flags & CF_READY);
		1449	ta->next->flags &= ~CF_READY;
		1450	SvRV_set (coro_current, next_sv);
		1451
		1452	LOCK;
		1453	free_coro_mortal (aTHX);
		1454	coro_mortal = prev_sv;
		1455	UNLOCK;
		1456	}
		1457
		1458	static void
		1459	prepare_cede (pTHX_ struct transfer_args *ta)
		1460	{
		1461	api_ready (coro_current);
		1462	prepare_schedule (aTHX_ ta);
		1463	}
		1464
		1465	static int
		1466	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1467	{
		1468	if (coro_nready)
		1469	{
		1470	SV *prev = SvRV (coro_current);
		1471	prepare_schedule (aTHX_ ta);
		1472	api_ready (prev);
		1473	return 1;
		1474	}
		1475	else
		1476	return 0;
		1477	}
		1478
		1479	static void
		1480	api_schedule (void)
		1481	{
		1482	dTHX;
		1483	struct transfer_args ta;
		1484
		1485	prepare_schedule (aTHX_ &ta);
		1486	TRANSFER (ta);
		1487	}
		1488
		1489	static int
		1490	api_cede (void)
		1491	{
		1492	dTHX;
		1493	struct transfer_args ta;
		1494
		1495	prepare_cede (aTHX_ &ta);
		1496
		1497	if (expect_true (ta.prev != ta.next))
		1498	{
		1499	TRANSFER (ta);
		1500	return 1;
		1501	}
		1502	else
		1503	return 0;
		1504	}
		1505
		1506	static int
		1507	api_cede_notself (void)
		1508	{
		1509	dTHX;
		1510	struct transfer_args ta;
		1511
		1512	if (prepare_cede_notself (aTHX_ &ta))
		1513	{
		1514	TRANSFER (ta);
		1515	return 1;
		1516	}
		1517	else
		1518	return 0;
		1519	}
		1520
		1521	static void
		1522	api_trace (SV *coro_sv, int flags)
		1523	{
		1524	dTHX;
		1525	struct coro *coro = SvSTATE (coro_sv);
		1526
		1527	if (flags & CC_TRACE)
		1528	{
		1529	if (!coro->cctx)
		1530	coro->cctx = cctx_new ();
		1531	else if (!(coro->cctx->flags & CC_TRACE))
		1532	croak ("cannot enable tracing on coroutine with custom stack");
		1533
		1534	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1535	}
		1536	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1537	{
		1538	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1539
		1540	if (coro->flags & CF_RUNNING)
		1541	PL_runops = RUNOPS_DEFAULT;
		1542	else
		1543	coro->slot->runops = RUNOPS_DEFAULT;
		1544	}
		1545	}
		1546
777	MODULE = Coro::State PACKAGE = Coro::State	1547	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
778		1548
779	PROTOTYPES: ENABLE	1549	PROTOTYPES: DISABLE
780		1550
781	BOOT:	1551	BOOT:
782	{ /* {} necessary for stoopid perl-5.6.x */	1552	{
783	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1553	#ifdef USE_ITHREADS
784	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1554	MUTEX_INIT (&coro_mutex);
		1555	#endif
		1556	BOOT_PAGESIZE;
		1557
		1558	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1559	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1560
		1561	orig_sigelem_get = PL_vtbl_sigelem.svt_get;
		1562	PL_vtbl_sigelem.svt_get = coro_sigelem_get;
		1563	orig_sigelem_set = PL_vtbl_sigelem.svt_set;
		1564	PL_vtbl_sigelem.svt_set = coro_sigelem_set;
		1565
		1566	hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
		1567	rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
		1568	rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
		1569
785	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1570	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
786		1571
787	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1572	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
788	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1573	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
789	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1574	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
790	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1575	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
791
792	if (!padlist_cache)
793	padlist_cache = newHV ();
794		1576
795	main_mainstack = PL_mainstack;	1577	main_mainstack = PL_mainstack;
796	}	1578	main_top_env = PL_top_env;
797		1579
798	Coro::State	1580	while (main_top_env->je_prev)
799	_newprocess(args)	1581	main_top_env = main_top_env->je_prev;
800	SV * args	1582
801	PROTOTYPE: $	1583	coroapi.ver = CORO_API_VERSION;
		1584	coroapi.rev = CORO_API_REVISION;
		1585	coroapi.transfer = api_transfer;
		1586
		1587	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1588	}
		1589
		1590	SV *
		1591	new (char *klass, ...)
802	CODE:	1592	CODE:
803	Coro__State coro;	1593	{
		1594	struct coro *coro;
		1595	MAGIC *mg;
		1596	HV *hv;
		1597	int i;
804		1598
805	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
806	croak ("Coro::State::_newprocess expects an arrayref");
807
808	New (0, coro, 1, struct coro);	1599	Newz (0, coro, 1, struct coro);
		1600	coro->args = newAV ();
		1601	coro->flags = CF_NEW;
809		1602
810	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1603	if (coro_first) coro_first->prev = coro;
811	coro->mainstack = 0; /* actual work is done inside transfer */	1604	coro->next = coro_first;
812	coro->stack = 0;	1605	coro_first = coro;
813		1606
814	RETVAL = coro;	1607	coro->hv = hv = newHV ();
		1608	mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
		1609	mg->mg_flags |= MGf_DUP;
		1610	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1611
		1612	av_extend (coro->args, items - 1);
		1613	for (i = 1; i < items; i++)
		1614	av_push (coro->args, newSVsv (ST (i)));
		1615	}
815	OUTPUT:	1616	OUTPUT:
816	RETVAL	1617	RETVAL
817		1618
		1619	# these not obviously related functions are all rolled into the same xs
		1620	# function to increase chances that they all will call transfer with the same
		1621	# stack offset
818	void	1622	void
819	transfer(prev, next, flags)	1623	_set_stacklevel (...)
820	Coro::State_or_hashref prev	1624	ALIAS:
821	Coro::State_or_hashref next	1625	Coro::State::transfer = 1
822	int flags	1626	Coro::schedule = 2
823	PROTOTYPE: @	1627	Coro::cede = 3
		1628	Coro::cede_notself = 4
824	CODE:	1629	CODE:
		1630	{
		1631	struct transfer_args ta;
		1632
825	PUTBACK;	1633	PUTBACK;
826	transfer (aTHX_ prev, next, flags);	1634	switch (ix)
		1635	{
		1636	case 0:
		1637	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1638	ta.next = 0;
		1639	break;
		1640
		1641	case 1:
		1642	if (items != 2)
		1643	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1644
		1645	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1646	break;
		1647
		1648	case 2:
		1649	prepare_schedule (aTHX_ &ta);
		1650	break;
		1651
		1652	case 3:
		1653	prepare_cede (aTHX_ &ta);
		1654	break;
		1655
		1656	case 4:
		1657	if (!prepare_cede_notself (aTHX_ &ta))
		1658	XSRETURN_EMPTY;
		1659
		1660	break;
		1661	}
827	SPAGAIN;	1662	SPAGAIN;
828		1663
		1664	BARRIER;
		1665	PUTBACK;
		1666	TRANSFER (ta);
		1667	SPAGAIN; /* might be the sp of a different coroutine now */
		1668	/* be extra careful not to ever do anything after TRANSFER */
		1669	}
		1670
		1671	bool
		1672	_destroy (SV *coro_sv)
		1673	CODE:
		1674	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1675	OUTPUT:
		1676	RETVAL
		1677
829	void	1678	void
830	DESTROY(coro)
831	Coro::State coro
832	CODE:
833
834	if (coro->mainstack && coro->mainstack != main_mainstack)
835	{
836	struct coro temp;
837
838	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);
839	LOAD(aTHX_ coro);
840
841	destroy_stacks (aTHX);
842
843	LOAD((&temp)); /* this will get rid of defsv etc.. */
844
845	coro->mainstack = 0;
846	}
847
848	deallocate_stack (coro);
849
850	Safefree (coro);
851
852	void
853	flush()
854	CODE:
855	#ifdef MAY_FLUSH
856	flush_padlist_cache ();
857	#endif
858
859	void
860	_exit(code)	1679	_exit (code)
861	int code	1680	int code
862	PROTOTYPE: $	1681	PROTOTYPE: $
863	CODE:	1682	CODE:
864	#if defined(__GLIBC__) || _POSIX_C_SOURCE
865	_exit (code);	1683	_exit (code);
866	#else
867	signal (SIGTERM, SIG_DFL);
868	raise (SIGTERM);
869	exit (code);
870	#endif
871		1684
872	MODULE = Coro::State PACKAGE = Coro::Cont	1685	int
		1686	cctx_stacksize (int new_stacksize = 0)
		1687	CODE:
		1688	RETVAL = coro_stacksize;
		1689	if (new_stacksize)
		1690	coro_stacksize = new_stacksize;
		1691	OUTPUT:
		1692	RETVAL
873		1693
874	# this is slightly dirty (should expose a c-level api)	1694	int
		1695	cctx_count ()
		1696	CODE:
		1697	RETVAL = cctx_count;
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
		1702	cctx_idle ()
		1703	CODE:
		1704	RETVAL = cctx_idle;
		1705	OUTPUT:
		1706	RETVAL
875		1707
876	void	1708	void
877	yield(...)	1709	list ()
878	PROTOTYPE: @	1710	PPCODE:
		1711	{
		1712	struct coro *coro;
		1713	for (coro = coro_first; coro; coro = coro->next)
		1714	if (coro->hv)
		1715	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1716	}
		1717
		1718	void
		1719	call (Coro::State coro, SV *coderef)
		1720	ALIAS:
		1721	eval = 1
		1722	CODE:
		1723	{
		1724	if (coro->mainstack)
		1725	{
		1726	struct coro temp;
		1727
		1728	if (!(coro->flags & CF_RUNNING))
		1729	{
		1730	PUTBACK;
		1731	save_perl (aTHX_ &temp);
		1732	load_perl (aTHX_ coro);
		1733	}
		1734
		1735	{
		1736	dSP;
		1737	ENTER;
		1738	SAVETMPS;
		1739	PUTBACK;
		1740	PUSHSTACK;
		1741	PUSHMARK (SP);
		1742
		1743	if (ix)
		1744	eval_sv (coderef, 0);
		1745	else
		1746	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1747
		1748	POPSTACK;
		1749	SPAGAIN;
		1750	FREETMPS;
		1751	LEAVE;
		1752	PUTBACK;
		1753	}
		1754
		1755	if (!(coro->flags & CF_RUNNING))
		1756	{
		1757	save_perl (aTHX_ coro);
		1758	load_perl (aTHX_ &temp);
		1759	SPAGAIN;
		1760	}
		1761	}
		1762	}
		1763
		1764	SV *
		1765	is_ready (Coro::State coro)
		1766	PROTOTYPE: $
		1767	ALIAS:
		1768	is_ready = CF_READY
		1769	is_running = CF_RUNNING
		1770	is_new = CF_NEW
		1771	is_destroyed = CF_DESTROYED
		1772	CODE:
		1773	RETVAL = boolSV (coro->flags & ix);
		1774	OUTPUT:
		1775	RETVAL
		1776
		1777	void
		1778	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1779
		1780	SV *
		1781	has_stack (Coro::State coro)
		1782	PROTOTYPE: $
		1783	CODE:
		1784	RETVAL = boolSV (!!coro->cctx);
		1785	OUTPUT:
		1786	RETVAL
		1787
		1788	int
		1789	is_traced (Coro::State coro)
		1790	PROTOTYPE: $
		1791	CODE:
		1792	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1793	OUTPUT:
		1794	RETVAL
		1795
		1796	IV
		1797	rss (Coro::State coro)
		1798	PROTOTYPE: $
		1799	ALIAS:
		1800	usecount = 1
879	CODE:	1801	CODE:
880	static SV *returnstk;	1802	switch (ix)
881	SV *sv;	1803	{
		1804	case 0: RETVAL = coro_rss (aTHX_ coro); break;
		1805	case 1: RETVAL = coro->usecount; break;
		1806	}
		1807	OUTPUT:
		1808	RETVAL
		1809
		1810
		1811	MODULE = Coro::State PACKAGE = Coro
		1812
		1813	BOOT:
		1814	{
		1815	int i;
		1816
		1817	sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
		1818	sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
		1819	av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
		1820
		1821	coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
		1822	SvREADONLY_on (coro_current);
		1823
		1824	coro_stash = gv_stashpv ("Coro", TRUE);
		1825
		1826	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1827	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1828	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1829	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1830	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1831	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1832
		1833	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1834	coro_ready[i] = newAV ();
		1835
		1836	{
		1837	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1838	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
		1839
		1840	coroapi.schedule = api_schedule;
		1841	coroapi.cede = api_cede;
		1842	coroapi.cede_notself = api_cede_notself;
		1843	coroapi.ready = api_ready;
		1844	coroapi.is_ready = api_is_ready;
		1845	coroapi.nready = &coro_nready;
		1846	coroapi.current = coro_current;
		1847
		1848	GCoroAPI = &coroapi;
		1849	sv_setiv (sv, (IV)&coroapi);
		1850	SvREADONLY_on (sv);
		1851	}
		1852	}
		1853
		1854	void
		1855	_set_current (SV *current)
		1856	PROTOTYPE: $
		1857	CODE:
		1858	SvREFCNT_dec (SvRV (coro_current));
		1859	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1860
		1861	int
		1862	prio (Coro::State coro, int newprio = 0)
		1863	ALIAS:
		1864	nice = 1
		1865	CODE:
		1866	{
		1867	RETVAL = coro->prio;
		1868
		1869	if (items > 1)
		1870	{
		1871	if (ix)
		1872	newprio = coro->prio - newprio;
		1873
		1874	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1875	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1876
		1877	coro->prio = newprio;
		1878	}
		1879	}
		1880	OUTPUT:
		1881	RETVAL
		1882
		1883	SV *
		1884	ready (SV *self)
		1885	PROTOTYPE: $
		1886	CODE:
		1887	RETVAL = boolSV (api_ready (self));
		1888	OUTPUT:
		1889	RETVAL
		1890
		1891	int
		1892	nready (...)
		1893	PROTOTYPE:
		1894	CODE:
		1895	RETVAL = coro_nready;
		1896	OUTPUT:
		1897	RETVAL
		1898
		1899	void
		1900	throw (Coro::State self, SV *throw = &PL_sv_undef)
		1901	PROTOTYPE: $;$
		1902	CODE:
		1903	SvREFCNT_dec (self->throw);
		1904	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1905
		1906	void
		1907	swap_defsv (Coro::State self)
		1908	PROTOTYPE: $
		1909	ALIAS:
		1910	swap_defav = 1
		1911	CODE:
		1912	if (!self->slot)
		1913	croak ("cannot swap state with coroutine that has no saved state");
		1914	else
		1915	{
		1916	SV **src = ix ? (SV *)&GvAV (PL_defgv) : &GvSV (PL_defgv);
		1917	SV **dst = ix ? self->slot->defav : self->slot->defsv;
		1918
		1919	SV *tmp = *src; *src = *dst; *dst = tmp;
		1920	}
		1921
		1922	# for async_pool speedup
		1923	void
		1924	_pool_1 (SV *cb)
		1925	CODE:
		1926	{
		1927	struct coro *coro = SvSTATE (coro_current);
		1928	HV *hv = (HV *)SvRV (coro_current);
882	AV *defav = GvAV (PL_defgv);	1929	AV *defav = GvAV (PL_defgv);
883	struct coro *prev, *next;	1930	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1931	AV *invoke_av;
		1932	int i, len;
884		1933
885	if (!returnstk)	1934	if (!invoke)
886	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1935	{
		1936	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1937	croak ("\3async_pool terminate\2\n");
		1938	}
887		1939
888	/* set up @_ -- ugly */	1940	SvREFCNT_dec (coro->saved_deffh);
889	av_clear (defav);	1941	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1942
		1943	hv_store (hv, "desc", sizeof ("desc") - 1,
		1944	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1945
		1946	invoke_av = (AV *)SvRV (invoke);
		1947	len = av_len (invoke_av);
		1948
		1949	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1950
		1951	if (len > 0)
		1952	{
890	av_fill (defav, items - 1);	1953	av_fill (defav, len - 1);
891	while (items--)	1954	for (i = 0; i < len; ++i)
892	av_store (defav, items, SvREFCNT_inc (ST(items)));	1955	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1956	}
893		1957
894	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
895	sv = av_pop ((AV *)SvRV (returnstk));
896	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
897	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
898	SvREFCNT_dec (sv);	1958	SvREFCNT_dec (invoke);
899
900	transfer(aTHX_ prev, next, 0);
901
902	MODULE = Coro::State PACKAGE = Coro
903
904	# this is slightly dirty (should expose a c-level api)
905
906	BOOT:
907	{
908	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
909	coro_ready = newAV ();
910	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
911	}	1959	}
912		1960
913	void	1961	void
914	ready(self)	1962	_pool_2 (SV *cb)
915	SV * self
916	CODE:	1963	CODE:
917	av_push (coro_ready, SvREFCNT_inc (self));	1964	{
		1965	struct coro *coro = SvSTATE (coro_current);
		1966
		1967	sv_setsv (cb, &PL_sv_undef);
		1968
		1969	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		1970	coro->saved_deffh = 0;
		1971
		1972	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1973	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1974	{
		1975	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1976	croak ("\3async_pool terminate\2\n");
		1977	}
		1978
		1979	av_clear (GvAV (PL_defgv));
		1980	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1981	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1982
		1983	coro->prio = 0;
		1984
		1985	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1986	api_trace (coro_current, 0);
		1987
		1988	av_push (av_async_pool, newSVsv (coro_current));
		1989	}
		1990
		1991
		1992	MODULE = Coro::State PACKAGE = Coro::AIO
		1993
		1994	SV *
		1995	_get_state ()
		1996	CODE:
		1997	{
		1998	struct io_state *data;
		1999
		2000	RETVAL = newSV (sizeof (struct io_state));
		2001	data = (struct io_state *)SvPVX (RETVAL);
		2002	SvCUR_set (RETVAL, sizeof (struct io_state));
		2003	SvPOK_only (RETVAL);
		2004
		2005	data->errorno = errno;
		2006	data->laststype = PL_laststype;
		2007	data->laststatval = PL_laststatval;
		2008	data->statcache = PL_statcache;
		2009	}
		2010	OUTPUT:
		2011	RETVAL
918		2012
919	void	2013	void
920	schedule(...)	2014	_set_state (char *data_)
921	ALIAS:	2015	PROTOTYPE: $
922	cede = 1
923	CODE:	2016	CODE:
924	SV *prev = GvSV (coro_current);	2017	{
925	SV *next = av_shift (coro_ready);	2018	struct io_state *data = (void *)data_;
926		2019
927	if (next == &PL_sv_undef)	2020	errno = data->errorno;
928	next = SvREFCNT_inc (GvSV (coro_idle));	2021	PL_laststype = data->laststype;
		2022	PL_laststatval = data->laststatval;
		2023	PL_statcache = data->statcache;
		2024	}
929		2025
930	if (ix)
931	av_push (coro_ready, SvREFCNT_inc (prev));
932
933	GvSV (coro_current) = SvREFCNT_inc (next);
934	transfer (sv_to_coro (prev, "Coro::schedule", "current coroutine"),
935	sv_to_coro (next, "Coro::schedule", "next coroutine"),
936	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
937	SvREFCNT_dec (next);
938	SvREFCNT_dec (prev);
939

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