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Comparing Coro/Coro/State.xs (file contents):
Revision 1.16 by root, Wed Jul 25 04:26:55 2001 UTC vs.
Revision 1.237 by root, Fri May 23 00:27:06 2008 UTC

		1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4	#define PERL_EXT
		5
1	#include "EXTERN.h"	6	#include "EXTERN.h"
2	#include "perl.h"	7	#include "perl.h"
3	#include "XSUB.h"	8	#include "XSUB.h"
4		9
5	#include "libcoro/coro.c"	10	#include "patchlevel.h"
		11
		12	#include <stdio.h>
		13	#include <errno.h>
		14	#include <assert.h>
		15
		16	#ifdef WIN32
		17	# undef setjmp
		18	# undef longjmp
		19	# undef _exit
		20	# define setjmp _setjmp // deep magic, don't ask
		21	#else
		22	# include <inttypes.h> /* most portable stdint.h */
		23	#endif
6		24
7	#ifdef HAVE_MMAP	25	#ifdef HAVE_MMAP
8	# include <unistd.h>	26	# include <unistd.h>
9	# include <sys/mman.h>	27	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	28	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	29	# ifdef MAP_ANON
		30	# define MAP_ANONYMOUS MAP_ANON
13	# else	31	# else
14	# undef HAVE_MMAP	32	# undef HAVE_MMAP
15	# endif	33	# endif
16	# endif	34	# endif
		35	# include <limits.h>
		36	# ifndef PAGESIZE
		37	# define PAGESIZE pagesize
		38	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		39	static long pagesize;
		40	# else
		41	# define BOOT_PAGESIZE (void)0
17	#endif	42	# endif
18
19	#define MAY_FLUSH /* increases codesize */
20
21	/* perl-related */
22	#define TRANSFER_SAVE_DEFAV 0x00000001
23	#define TRANSFER_SAVE_DEFSV 0x00000002
24	#define TRANSFER_SAVE_ERRSV 0x00000004
25	/* c-related */
26	#define TRANSFER_SAVE_CCTXT 0x00000008
27	#ifdef CORO_LAZY_STACK
28	# define TRANSFER_LAZY_STACK 0x00000010
29	#else	43	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	44	# define PAGESIZE 0
		45	# define BOOT_PAGESIZE (void)0
		46	#endif
		47
		48	#if CORO_USE_VALGRIND
		49	# include <valgrind/valgrind.h>
		50	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		51	#else
		52	# define REGISTER_STACK(cctx,start,end)
		53	#endif
		54
		55	/* the maximum number of idle cctx that will be pooled */
		56	#define MAX_IDLE_CCTX 8
		57
		58	#define PERL_VERSION_ATLEAST(a,b,c) \
		59	(PERL_REVISION > (a) \
		60	|| (PERL_REVISION == (a) \
		61	&& (PERL_VERSION > (b) \
		62	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		63
		64	#if !PERL_VERSION_ATLEAST (5,6,0)
		65	# ifndef PL_ppaddr
		66	# define PL_ppaddr ppaddr
31	#endif	67	# endif
		68	# ifndef call_sv
		69	# define call_sv perl_call_sv
		70	# endif
		71	# ifndef get_sv
		72	# define get_sv perl_get_sv
		73	# endif
		74	# ifndef get_cv
		75	# define get_cv perl_get_cv
		76	# endif
		77	# ifndef IS_PADGV
		78	# define IS_PADGV(v) 0
		79	# endif
		80	# ifndef IS_PADCONST
		81	# define IS_PADCONST(v) 0
		82	# endif
		83	#endif
32		84
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	85	/* 5.8.8 */
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	86	#ifndef GV_NOTQUAL
		87	# define GV_NOTQUAL 0
		88	#endif
		89	#ifndef newSV
		90	# define newSV(l) NEWSV(0,l)
		91	#endif
35		92
36	#define SUB_INIT "Coro::State::initialize"	93	/* 5.11 */
37	#define UCORO_STATE "_coro_state"	94	#ifndef CxHASARGS
		95	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
		96	#endif
38		97
39	/* The next macro should delcare a variable stacklevel that contains and approximation	98	/* 5.8.7 */
40	* to the current C stack pointer. It's property is that it changes with each call	99	#ifndef SvRV_set
41	* and should be unique. */	100	# define SvRV_set(s,v) SvRV(s) = (v)
		101	#endif
		102
		103	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		104	# undef CORO_STACKGUARD
		105	#endif
		106
		107	#ifndef CORO_STACKGUARD
		108	# define CORO_STACKGUARD 0
		109	#endif
		110
		111	/* prefer perl internal functions over our own? */
		112	#ifndef CORO_PREFER_PERL_FUNCTIONS
		113	# define CORO_PREFER_PERL_FUNCTIONS 0
		114	#endif
		115
		116	/* The next macros try to return the current stack pointer, in an as
		117	* portable way as possible. */
		118	#define dSTACKLEVEL volatile char stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	119	#define STACKLEVEL ((void *)&stacklevel)
43		120
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	121	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		122
46	/* this is actually not only the c stack but also c registers etc... */	123	#if __GNUC__ >= 3
		124	# define attribute(x) __attribute__(x)
		125	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		126	# define expect(expr,value) __builtin_expect ((expr),(value))
		127	#else
		128	# define attribute(x)
		129	# define BARRIER
		130	# define expect(expr,value) (expr)
		131	#endif
		132
		133	#define expect_false(expr) expect ((expr) != 0, 0)
		134	#define expect_true(expr) expect ((expr) != 0, 1)
		135
		136	#define NOINLINE attribute ((noinline))
		137
		138	#include "CoroAPI.h"
		139
		140	#ifdef USE_ITHREADS
		141	static perl_mutex coro_mutex;
		142	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		143	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		144	#else
		145	# define LOCK (void)0
		146	# define UNLOCK (void)0
		147	#endif
		148
		149	/* helper storage struct for Coro::AIO */
		150	struct io_state
		151	{
		152	int errorno;
		153	I32 laststype;
		154	int laststatval;
		155	Stat_t statcache;
		156	};
		157
		158	static size_t coro_stacksize = CORO_STACKSIZE;
		159	static struct CoroAPI coroapi;
		160	static AV *main_mainstack; /* used to differentiate between $main and others */
		161	static JMPENV *main_top_env;
		162	static HV *coro_state_stash, *coro_stash;
		163	static volatile SV *coro_mortal; /* will be freed after next transfer */
		164
		165	static GV *irsgv; /* $/ */
		166	static GV *stdoutgv; /* *STDOUT */
		167	static SV *rv_diehook;
		168	static SV *rv_warnhook;
		169	static HV *hv_sig; /* %SIG */
		170
		171	/* async_pool helper stuff */
		172	static SV *sv_pool_rss;
		173	static SV *sv_pool_size;
		174	static AV *av_async_pool;
		175
		176	/* Coro::AnyEvent */
		177	static SV *sv_activity;
		178
		179	static struct coro_cctx *cctx_first;
		180	static int cctx_count, cctx_idle;
		181
		182	enum {
		183	CC_MAPPED = 0x01,
		184	CC_NOREUSE = 0x02, /* throw this away after tracing */
		185	CC_TRACE = 0x04,
		186	CC_TRACE_SUB = 0x08, /* trace sub calls */
		187	CC_TRACE_LINE = 0x10, /* trace each statement */
		188	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		189	};
		190
		191	/* this is a structure representing a c-level coroutine */
		192	typedef struct coro_cctx {
		193	struct coro_cctx *next;
		194
		195	/* the stack */
		196	void *sptr;
		197	size_t ssize;
		198
		199	/* cpu state */
		200	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		201	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		202	JMPENV *top_env;
		203	coro_context cctx;
		204
		205	#if CORO_USE_VALGRIND
		206	int valgrind_id;
		207	#endif
		208	unsigned char flags;
		209	} coro_cctx;
		210
		211	enum {
		212	CF_RUNNING = 0x0001, /* coroutine is running */
		213	CF_READY = 0x0002, /* coroutine is ready */
		214	CF_NEW = 0x0004, /* has never been switched to */
		215	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		216	};
		217
		218	/* the structure where most of the perl state is stored, overlaid on the cxstack */
47	typedef struct {	219	typedef struct {
48	int refcnt; /* pointer reference counter */	220	SV *defsv;
49	int usecnt; /* shared by how many coroutines */	221	AV *defav;
50	int gencnt; /* generation counter */	222	SV *errsv;
		223	SV *irsgv;
		224	#define VAR(name,type) type name;
		225	# include "state.h"
		226	#undef VAR
		227	} perl_slots;
51		228
52	coro_context cctx;	229	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
53		230
54	void *sptr;	231	/* this is a structure representing a perl-level coroutine */
55	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57
58	static coro_stack main_stack = { 1, 0, 0 };
59
60	struct coro {	232	struct coro {
61	/* the optional C context */	233	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	234	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65		235
66	/* optionally saved, might be zero */	236	/* process data */
67	AV *defav;
68	SV *defsv;
69	SV *errsv;
70
71	/* saved global state not related to stacks */
72	U8 dowarn;
73
74	/* the stacks and related info (callchain etc..) */
75	PERL_SI *curstackinfo;
76	AV *curstack;
77	AV *mainstack;	237	AV *mainstack;
78	SV **stack_sp;	238	perl_slots *slot; /* basically the saved sp */
79	OP *op;
80	SV **curpad;
81	SV **stack_base;
82	SV **stack_max;
83	SV **tmps_stack;
84	I32 tmps_floor;
85	I32 tmps_ix;
86	I32 tmps_max;
87	I32 *markstack;
88	I32 *markstack_ptr;
89	I32 *markstack_max;
90	I32 *scopestack;
91	I32 scopestack_ix;
92	I32 scopestack_max;
93	ANY *savestack;
94	I32 savestack_ix;
95	I32 savestack_max;
96	OP **retstack;
97	I32 retstack_ix;
98	I32 retstack_max;
99	COP *curcop;
100	JMPENV start_env;
101	JMPENV *top_env;
102		239
103	/* data associated with this coroutine (initial args) */	240	AV *args; /* data associated with this coroutine (initial args) */
104	AV *args;	241	int refcnt; /* coroutines are refcounted, yes */
		242	int flags; /* CF_ flags */
		243	HV *hv; /* the perl hash associated with this coro, if any */
		244
		245	/* statistics */
		246	int usecount; /* number of transfers to this coro */
		247
		248	/* coro process data */
		249	int prio;
		250	SV *throw; /* exception to be thrown */
		251
		252	/* async_pool */
		253	SV *saved_deffh;
		254
		255	/* linked list */
		256	struct coro *next, *prev;
105	};	257	};
106		258
107	typedef struct coro *Coro__State;	259	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	260	typedef struct coro *Coro__State_or_hashref;
109		261
110	static AV *main_mainstack; /* used to differentiate between $main and others */	262	/** Coro ********************************************************************/
111	static HV *coro_state_stash;
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115		263
116	/* mostly copied from op.c:cv_clone2 */	264	#define PRIO_MAX 3
117	STATIC AV *	265	#define PRIO_HIGH 1
118	clone_padlist (AV *protopadlist)	266	#define PRIO_NORMAL 0
		267	#define PRIO_LOW -1
		268	#define PRIO_IDLE -3
		269	#define PRIO_MIN -4
		270
		271	/* for Coro.pm */
		272	static SV *coro_current;
		273	static SV *coro_readyhook;
		274	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		275	static int coro_nready;
		276	static struct coro *coro_first;
		277
		278	/** lowlevel stuff **********************************************************/
		279
		280	static SV *
		281	coro_get_sv (pTHX_ const char *name, int create)
119	{	282	{
120	AV *av;	283	#if PERL_VERSION_ATLEAST (5,10,0)
121	I32 ix;	284	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);	285	get_sv (name, create);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);	286	#endif
124	SV **pname = AvARRAY (protopad_name);	287	return get_sv (name, create);
125	SV **ppad = AvARRAY (protopad);	288	}
126	I32 fname = AvFILLp (protopad_name);	289
127	I32 fpad = AvFILLp (protopad);	290	static AV *
		291	coro_get_av (pTHX_ const char *name, int create)
		292	{
		293	#if PERL_VERSION_ATLEAST (5,10,0)
		294	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		295	get_av (name, create);
		296	#endif
		297	return get_av (name, create);
		298	}
		299
		300	static HV *
		301	coro_get_hv (pTHX_ const char *name, int create)
		302	{
		303	#if PERL_VERSION_ATLEAST (5,10,0)
		304	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		305	get_hv (name, create);
		306	#endif
		307	return get_hv (name, create);
		308	}
		309
		310	static AV *
		311	coro_clone_padlist (pTHX_ CV *cv)
		312	{
		313	AV *padlist = CvPADLIST (cv);
128	AV *newpadlist, *newpad_name, *newpad;	314	AV *newpadlist, *newpad;
129	SV **npad;
130
131	newpad_name = newAV ();
132	for (ix = fname; ix >= 0; ix--)
133	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135	newpad = newAV ();
136	av_fill (newpad, AvFILLp (protopad));
137	npad = AvARRAY (newpad);
138		315
139	newpadlist = newAV ();	316	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	317	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	318	#if PERL_VERSION_ATLEAST (5,10,0)
		319	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		320	#else
		321	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		322	#endif
		323	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		324	--AvFILLp (padlist);
		325
		326	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	327	av_store (newpadlist, 1, (SV *)newpad);
143		328
144	av = newAV (); /* will be @_ */	329	return newpadlist;
145	av_extend (av, 0);	330	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		331
149	for (ix = fpad; ix > 0; ix--)	332	static void
		333	free_padlist (pTHX_ AV *padlist)
		334	{
		335	/* may be during global destruction */
		336	if (SvREFCNT (padlist))
150	{	337	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	338	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	339	while (i >= 0)
153	{	340	{
154	char *name = SvPVX (namesv); /* XXX */	341	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	342	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	343	{
159	else
160	{ /* our own lexical */
161	SV *sv;	344	SV *sv;
162	if (*name == '&')	345	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	346	SvREFCNT_dec (sv);
164	else if (*name == '@')	347
165	sv = (SV *) newAV ();	348	SvREFCNT_dec (*svp);
166	else if (*name == '%')
167	sv = (SV *) newHV ();
168	else
169	sv = NEWSV (0, 0);
170	if (!SvPADBUSY (sv))
171	SvPADMY_on (sv);
172	npad[ix] = sv;
173	}	349	}
174	}	350	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
176	{
177	npad[ix] = SvREFCNT_inc (ppad[ix]);
178	}
179	else
180	{
181	SV *sv = NEWSV (0, 0);
182	SvPADTMP_on (sv);
183	npad[ix] = sv;
184	}
185	}
186		351
187	#if 0 /* return -ENOTUNDERSTOOD */
188	/* Now that vars are all in place, clone nested closures. */
189
190	for (ix = fpad; ix > 0; ix--) {
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
192	if (namesv
193	&& namesv != &PL_sv_undef
194	&& !(SvFLAGS(namesv) & SVf_FAKE)
195	&& *SvPVX(namesv) == '&'
196	&& CvCLONE(ppad[ix]))
197	{
198	CV *kid = cv_clone((CV*)ppad[ix]);
199	SvREFCNT_dec(ppad[ix]);
200	CvCLONE_on(kid);
201	SvPADMY_on(kid);
202	npad[ix] = (SV*)kid;
203	}
204	}
205	#endif
206
207	return newpadlist;
208	}
209
210	#ifdef MAY_FLUSH
211	STATIC AV *
212	free_padlist (AV *padlist)
213	{
214	/* may be during global destruction */
215	if (SvREFCNT(padlist))
216	{
217	I32 i = AvFILLp(padlist);
218	while (i >= 0)
219	{
220	SV **svp = av_fetch(padlist, i--, FALSE);
221	SV *sv = svp ? *svp : Nullsv;
222	if (sv)
223	SvREFCNT_dec(sv);
224	}
225
226	SvREFCNT_dec((SV*)padlist);	352	SvREFCNT_dec ((SV*)padlist);
227	}	353	}
228	}	354	}
229	#endif	355
		356	static int
		357	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		358	{
		359	AV *padlist;
		360	AV *av = (AV *)mg->mg_obj;
		361
		362	/* casting is fun. */
		363	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		364	free_padlist (aTHX_ padlist);
		365
		366	return 0;
		367	}
		368
		369	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
		370	#define CORO_MAGIC_type_state PERL_MAGIC_ext
		371
		372	static MGVTBL coro_cv_vtbl = {
		373	0, 0, 0, 0,
		374	coro_cv_free
		375	};
		376
		377	#define CORO_MAGIC(sv,type) \
		378	SvMAGIC (sv) \
		379	? SvMAGIC (sv)->mg_type == type \
		380	? SvMAGIC (sv) \
		381	: mg_find (sv, type) \
		382	: 0
		383
		384	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
		385	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
		386
		387	static struct coro *
		388	SvSTATE_ (pTHX_ SV *coro)
		389	{
		390	HV *stash;
		391	MAGIC *mg;
		392
		393	if (SvROK (coro))
		394	coro = SvRV (coro);
		395
		396	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		397	croak ("Coro::State object required");
		398
		399	stash = SvSTASH (coro);
		400	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		401	{
		402	/* very slow, but rare, check */
		403	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		404	croak ("Coro::State object required");
		405	}
		406
		407	mg = CORO_MAGIC_state (coro);
		408	return (struct coro *)mg->mg_ptr;
		409	}
		410
		411	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
230		412
231	/* the next two functions merely cache the padlists */	413	/* the next two functions merely cache the padlists */
232	STATIC void	414	static void
233	get_padlist (CV *cv)	415	get_padlist (pTHX_ CV *cv)
234	{	416	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	417	MAGIC *mg = CORO_MAGIC_cv (cv);
		418	AV *av;
236		419
237	if (he && AvFILLp ((AV *)*he) >= 0)	420	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	421	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
239	else	422	else
240	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241	}
242
243	STATIC void
244	put_padlist (CV *cv)
245	{
246	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248	if (SvTYPE (*he) != SVt_PVAV)
249	{	423	{
		424	#if CORO_PREFER_PERL_FUNCTIONS
		425	/* this is probably cleaner, but also slower? */
		426	CV *cp = Perl_cv_clone (cv);
		427	CvPADLIST (cv) = CvPADLIST (cp);
		428	CvPADLIST (cp) = 0;
250	SvREFCNT_dec (*he);	429	SvREFCNT_dec (cp);
251	*he = (SV *)newAV ();	430	#else
		431	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		432	#endif
252	}	433	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}	434	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282
283	#define SB do {
284	#define SE } while (0)
285
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
290		435
291	static void	436	static void
		437	put_padlist (pTHX_ CV *cv)
		438	{
		439	MAGIC *mg = CORO_MAGIC_cv (cv);
		440	AV *av;
		441
		442	if (expect_false (!mg))
		443	mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
		444
		445	av = (AV *)mg->mg_obj;
		446
		447	if (expect_false (AvFILLp (av) >= AvMAX (av)))
		448	av_extend (av, AvMAX (av) + 1);
		449
		450	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		451	}
		452
		453	/** load & save, init *******************************************************/
		454
		455	static void
292	load_state(pTHX_ Coro__State c)	456	load_perl (pTHX_ Coro__State c)
293	{	457	{
294	PL_dowarn = c->dowarn;	458	perl_slots *slot = c->slot;
		459	c->slot = 0;
295		460
296	PL_curstackinfo = c->curstackinfo;
297	PL_curstack = c->curstack;
298	PL_mainstack = c->mainstack;	461	PL_mainstack = c->mainstack;
299	PL_stack_sp = c->stack_sp;
300	PL_op = c->op;
301	PL_curpad = c->curpad;
302	PL_stack_base = c->stack_base;
303	PL_stack_max = c->stack_max;
304	PL_tmps_stack = c->tmps_stack;
305	PL_tmps_floor = c->tmps_floor;
306	PL_tmps_ix = c->tmps_ix;
307	PL_tmps_max = c->tmps_max;
308	PL_markstack = c->markstack;
309	PL_markstack_ptr = c->markstack_ptr;
310	PL_markstack_max = c->markstack_max;
311	PL_scopestack = c->scopestack;
312	PL_scopestack_ix = c->scopestack_ix;
313	PL_scopestack_max = c->scopestack_max;
314	PL_savestack = c->savestack;
315	PL_savestack_ix = c->savestack_ix;
316	PL_savestack_max = c->savestack_max;
317	PL_retstack = c->retstack;
318	PL_retstack_ix = c->retstack_ix;
319	PL_retstack_max = c->retstack_max;
320	PL_curcop = c->curcop;
321	PL_start_env = c->start_env;
322	PL_top_env = c->top_env;
323		462
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	463	GvSV (PL_defgv) = slot->defsv;
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	464	GvAV (PL_defgv) = slot->defav;
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	465	GvSV (PL_errgv) = slot->errsv;
		466	GvSV (irsgv) = slot->irsgv;
		467
		468	#define VAR(name,type) PL_ ## name = slot->name;
		469	# include "state.h"
		470	#undef VAR
327		471
328	{	472	{
329	dSP;	473	dSP;
		474
330	CV *cv;	475	CV *cv;
331		476
332	/* now do the ugly restore mess */	477	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	478	while (expect_true (cv = (CV *)POPs))
334	{	479	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	480	put_padlist (aTHX_ cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	481	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	482	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	483	}
348		484
349	PUTBACK;	485	PUTBACK;
350	}	486	}
351	}	487	}
352		488
353	static void	489	static void
354	save_state(pTHX_ Coro__State c, int flags)	490	save_perl (pTHX_ Coro__State c)
355	{	491	{
356	{	492	{
357	dSP;	493	dSP;
358	I32 cxix = cxstack_ix;	494	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	495	PERL_CONTEXT *ccstk = cxstack;
…		…
362	/*	498	/*
363	* the worst thing you can imagine happens first - we have to save	499	* the worst thing you can imagine happens first - we have to save
364	* (and reinitialize) all cv's in the whole callchain :(	500	* (and reinitialize) all cv's in the whole callchain :(
365	*/	501	*/
366		502
367	PUSHs (Nullsv);	503	XPUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	504	/* this loop was inspired by pp_caller */
369	for (;;)	505	for (;;)
370	{	506	{
371	do	507	while (expect_true (cxix >= 0))
372	{	508	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	509	PERL_CONTEXT *cx = &ccstk[cxix--];
374		510
375	if (CxTYPE(cx) == CXt_SUB)	511	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
376	{	512	{
377	CV *cv = cx->blk_sub.cv;	513	CV *cv = cx->blk_sub.cv;
		514
378	if (CvDEPTH(cv))	515	if (expect_true (CvDEPTH (cv)))
379	{	516	{
380	#ifdef USE_THREADS
381	/*XPUSHs ((SV *)CvOWNER(cv));*/
382	/*CvOWNER(cv) = 0;*/
383	/*error must unlock this cv etc.. etc...*/
384	#endif
385	EXTEND (SP, CvDEPTH(cv)*2);	517	EXTEND (SP, 3);
386
387	while (--CvDEPTH(cv))
388	{
389	/* this tells the restore code to increment CvDEPTH */
390	PUSHs (Nullsv);
391	PUSHs ((SV *)cv);
392	}
393
394	PUSHs ((SV *)CvPADLIST(cv));	518	PUSHs ((SV *)CvPADLIST (cv));
		519	PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	520	PUSHs ((SV *)cv);
396		521
397	get_padlist (cv); /* this is a monster */	522	CvDEPTH (cv) = 0;
		523	get_padlist (aTHX_ cv);
398	}	524	}
399	}	525	}
400	else if (CxTYPE(cx) == CXt_FORMAT)
401	{
402	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}
406	}	526	}
407	while (cxix >= 0);
408		527
409	if (top_si->si_type == PERLSI_MAIN)	528	if (expect_true (top_si->si_type == PERLSI_MAIN))
410	break;	529	break;
411		530
412	top_si = top_si->si_prev;	531	top_si = top_si->si_prev;
413	ccstk = top_si->si_cxstack;	532	ccstk = top_si->si_cxstack;
414	cxix = top_si->si_cxix;	533	cxix = top_si->si_cxix;
415	}	534	}
416		535
417	PUTBACK;	536	PUTBACK;
418	}	537	}
419		538
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	539	/* allocate some space on the context stack for our purposes */
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	540	/* we manually unroll here, as usually 2 slots is enough */
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	541	if (SLOT_COUNT >= 1) CXINC;
		542	if (SLOT_COUNT >= 2) CXINC;
		543	if (SLOT_COUNT >= 3) CXINC;
		544	{
		545	int i;
		546	for (i = 3; i < SLOT_COUNT; ++i)
		547	CXINC;
		548	}
		549	cxstack_ix -= SLOT_COUNT; /* undo allocation */
423		550
424	/* I have not the slightest idea of why av_reify is necessary */
425	/* but if it's missing the defav contents magically get replaced sometimes */
426	if (c->defav)
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430
431	c->curstackinfo = PL_curstackinfo;
432	c->curstack = PL_curstack;
433	c->mainstack = PL_mainstack;	551	c->mainstack = PL_mainstack;
434	c->stack_sp = PL_stack_sp;	552
435	c->op = PL_op;	553	{
436	c->curpad = PL_curpad;	554	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
437	c->stack_base = PL_stack_base;	555
438	c->stack_max = PL_stack_max;	556	slot->defav = GvAV (PL_defgv);
439	c->tmps_stack = PL_tmps_stack;	557	slot->defsv = DEFSV;
440	c->tmps_floor = PL_tmps_floor;	558	slot->errsv = ERRSV;
441	c->tmps_ix = PL_tmps_ix;	559	slot->irsgv = GvSV (irsgv);
442	c->tmps_max = PL_tmps_max;	560
443	c->markstack = PL_markstack;	561	#define VAR(name,type) slot->name = PL_ ## name;
444	c->markstack_ptr = PL_markstack_ptr;	562	# include "state.h"
445	c->markstack_max = PL_markstack_max;	563	#undef VAR
446	c->scopestack = PL_scopestack;	564	}
447	c->scopestack_ix = PL_scopestack_ix;
448	c->scopestack_max = PL_scopestack_max;
449	c->savestack = PL_savestack;
450	c->savestack_ix = PL_savestack_ix;
451	c->savestack_max = PL_savestack_max;
452	c->retstack = PL_retstack;
453	c->retstack_ix = PL_retstack_ix;
454	c->retstack_max = PL_retstack_max;
455	c->curcop = PL_curcop;
456	c->start_env = PL_start_env;
457	c->top_env = PL_top_env;
458	}	565	}
459		566
460	/*	567	/*
461	* allocate various perl stacks. This is an exact copy	568	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	569	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	570	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	571	* not usually need a lot of stackspace.
465	*/	572	*/
466	STATIC void	573	#if CORO_PREFER_PERL_FUNCTIONS
		574	# define coro_init_stacks init_stacks
		575	#else
		576	static void
467	coro_init_stacks (pTHX)	577	coro_init_stacks (pTHX)
468	{	578	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	579	PL_curstackinfo = new_stackinfo(32, 8);
470	PL_curstackinfo->si_type = PERLSI_MAIN;	580	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	581	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	582	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		583
474	PL_stack_base = AvARRAY(PL_curstack);	584	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	585	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	586	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		587
478	New(50,PL_tmps_stack,96,SV*);	588	New(50,PL_tmps_stack,32,SV*);
479	PL_tmps_floor = -1;	589	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	590	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	591	PL_tmps_max = 32;
482		592
483	New(54,PL_markstack,16,I32);	593	New(54,PL_markstack,16,I32);
484	PL_markstack_ptr = PL_markstack;	594	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	595	PL_markstack_max = PL_markstack + 16;
486		596
		597	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	598	SET_MARK_OFFSET;
		599	#endif
488		600
489	New(54,PL_scopestack,16,I32);	601	New(54,PL_scopestack,8,I32);
490	PL_scopestack_ix = 0;	602	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	603	PL_scopestack_max = 8;
492		604
493	New(54,PL_savestack,96,ANY);	605	New(54,PL_savestack,24,ANY);
494	PL_savestack_ix = 0;	606	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	607	PL_savestack_max = 24;
496		608
		609	#if !PERL_VERSION_ATLEAST (5,10,0)
497	New(54,PL_retstack,8,OP*);	610	New(54,PL_retstack,4,OP*);
498	PL_retstack_ix = 0;	611	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	612	PL_retstack_max = 4;
		613	#endif
500	}	614	}
		615	#endif
501		616
502	/*	617	/*
503	* destroy the stacks, the callchain etc...	618	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	619	*/
506	STATIC void	620	static void
507	destroy_stacks(pTHX)	621	coro_destroy_stacks (pTHX)
508	{	622	{
509	/* is this ugly, I ask? */
510	while (PL_scopestack_ix)
511	LEAVE;
512
513	/* sure it is, but more important: is it correct?? :/ */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;
516
517	while (PL_curstackinfo->si_next)	623	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	624	PL_curstackinfo = PL_curstackinfo->si_next;
519		625
520	while (PL_curstackinfo)	626	while (PL_curstackinfo)
521	{	627	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	628	PERL_SI *p = PL_curstackinfo->si_prev;
523		629
524	{	630	if (!IN_DESTRUCT)
525	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */
528	}
529
530	dounwind(-1);
531
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	631	SvREFCNT_dec (PL_curstackinfo->si_stack);
		632
533	Safefree(PL_curstackinfo->si_cxstack);	633	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	634	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	635	PL_curstackinfo = p;
536	}	636	}
537		637
538	Safefree(PL_tmps_stack);	638	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	639	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	640	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	641	Safefree (PL_savestack);
		642	#if !PERL_VERSION_ATLEAST (5,10,0)
542	Safefree(PL_retstack);	643	Safefree (PL_retstack);
		644	#endif
		645	}
		646
		647	static size_t
		648	coro_rss (pTHX_ struct coro *coro)
		649	{
		650	size_t rss = sizeof (*coro);
		651
		652	if (coro->mainstack)
		653	{
		654	perl_slots tmp_slot;
		655	perl_slots *slot;
		656
		657	if (coro->flags & CF_RUNNING)
		658	{
		659	slot = &tmp_slot;
		660
		661	#define VAR(name,type) slot->name = PL_ ## name;
		662	# include "state.h"
		663	#undef VAR
		664	}
		665	else
		666	slot = coro->slot;
		667
		668	rss += sizeof (slot->curstackinfo);
		669	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		670	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		671	rss += slot->tmps_max * sizeof (SV *);
		672	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		673	rss += slot->scopestack_max * sizeof (I32);
		674	rss += slot->savestack_max * sizeof (ANY);
		675
		676	#if !PERL_VERSION_ATLEAST (5,10,0)
		677	rss += slot->retstack_max * sizeof (OP *);
		678	#endif
		679	}
		680
		681	return rss;
		682	}
		683
		684	/** coroutine stack handling ************************************************/
		685
		686	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
		687	static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
		688
		689	/*
		690	* This overrides the default magic get method of %SIG elements.
		691	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
		692	* and instead of tryign to save and restore the hash elements, we just provide
		693	* readback here.
		694	* We only do this when the hook is != 0, as they are often set to 0 temporarily,
		695	* not expecting this to actually change the hook. This is a potential problem
		696	* when a schedule happens then, but we ignore this.
		697	*/
		698	static int
		699	coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
		700	{
		701	const char *s = MgPV_nolen_const (mg);
		702
		703	if (*s == '_')
		704	{
		705	if (strEQ (s, "__DIE__" ) && PL_diehook ) return sv_setsv (sv, PL_diehook ), 0;
		706	if (strEQ (s, "__WARN__") && PL_warnhook) return sv_setsv (sv, PL_warnhook), 0;
		707	}
		708
		709	return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
		710	}
		711
		712	static int
		713	coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
		714	{
		715	const char *s = MgPV_nolen_const (mg);
		716
		717	if (*s == '_')
		718	{
		719	SV **svp = 0;
		720
		721	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		722	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		723
		724	if (svp)
		725	{
		726	SV *old = *svp;
		727	*svp = newSVsv (sv);
		728	SvREFCNT_dec (old);
		729	return 0;
		730	}
		731	}
		732
		733	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
543	}	734	}
544		735
545	static void	736	static void
546	allocate_stack (Coro__State ctx, int alloc)	737	coro_setup (pTHX_ struct coro *coro)
547	{
548	coro_stack *stack;
549
550	New (0, stack, 1, coro_stack);
551
552	stack->refcnt = 1;
553	stack->usecnt = 1;
554	stack->gencnt = ctx->gencnt = 0;
555	if (alloc)
556	{
557	#ifdef HAVE_MMAP
558	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}
573
574	static void
575	deallocate_stack (Coro__State ctx)
576	{
577	coro_stack *stack = ctx->stack;
578
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void
600	setup_coro (void *arg)
601	{	738	{
602	/*	739	/*
603	* emulate part of the perl startup here.	740	* emulate part of the perl startup here.
604	*/	741	*/
605	dSP;
606	Coro__State ctx = (Coro__State)arg;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608
609	coro_init_stacks (aTHX);	742	coro_init_stacks (aTHX);
610	JMPENV_BOOTSTRAP;	743
		744	PL_runops = RUNOPS_DEFAULT;
		745	PL_curcop = &PL_compiling;
		746	PL_in_eval = EVAL_NULL;
		747	PL_comppad = 0;
		748	PL_curpm = 0;
		749	PL_curpad = 0;
		750	PL_localizing = 0;
		751	PL_dirty = 0;
		752	PL_restartop = 0;
		753	#if PERL_VERSION_ATLEAST (5,10,0)
		754	PL_parser = 0;
		755	#endif
		756
		757	/* recreate the die/warn hooks */
		758	PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
		759	PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
		760
		761	GvSV (PL_defgv) = newSV (0);
		762	GvAV (PL_defgv) = coro->args; coro->args = 0;
		763	GvSV (PL_errgv) = newSV (0);
		764	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		765	PL_rs = newSVsv (GvSV (irsgv));
		766	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		767
		768	{
		769	dSP;
		770	LOGOP myop;
		771
		772	Zero (&myop, 1, LOGOP);
		773	myop.op_next = Nullop;
		774	myop.op_flags = OPf_WANT_VOID;
		775
		776	PUSHMARK (SP);
		777	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		778	PUTBACK;
		779	PL_op = (OP *)&myop;
		780	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	781	SPAGAIN;
		782	}
612		783
613	/*PL_curcop = 0;*/	784	/* this newly created coroutine might be run on an existing cctx which most
		785	* likely was suspended in set_stacklevel, called from entersub.
		786	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		787	* so we ENTER here for symmetry
		788	*/
		789	ENTER;
		790	}
		791
		792	static void
		793	coro_destroy (pTHX_ struct coro *coro)
		794	{
		795	if (!IN_DESTRUCT)
		796	{
		797	/* restore all saved variables and stuff */
		798	LEAVE_SCOPE (0);
		799	assert (PL_tmps_floor == -1);
		800
		801	/* free all temporaries */
		802	FREETMPS;
		803	assert (PL_tmps_ix == -1);
		804
		805	/* unwind all extra stacks */
		806	POPSTACK_TO (PL_mainstack);
		807
		808	/* unwind main stack */
		809	dounwind (-1);
		810	}
		811
		812	SvREFCNT_dec (GvSV (PL_defgv));
614	SvREFCNT_dec (GvAV (PL_defgv));	813	SvREFCNT_dec (GvAV (PL_defgv));
615	GvAV (PL_defgv) = ctx->args;	814	SvREFCNT_dec (GvSV (PL_errgv));
		815	SvREFCNT_dec (PL_defoutgv);
		816	SvREFCNT_dec (PL_rs);
		817	SvREFCNT_dec (GvSV (irsgv));
616		818
617	if (ctx->stack)	819	SvREFCNT_dec (PL_diehook);
618	{	820	SvREFCNT_dec (PL_warnhook);
619	ctx->cursp = 0;	821
		822	SvREFCNT_dec (coro->saved_deffh);
		823	SvREFCNT_dec (coro->throw);
620		824
621	PUSHMARK(SP);	825	coro_destroy_stacks (aTHX);
622	PUTBACK;
623	(void) call_sv (sub_init, G_VOID|G_NOARGS);
624	croak ("FATAL: CCTXT coroutine returned!");
625	}
626	else
627	{
628	UNOP myop;
629
630	PL_op = (OP *)&myop;
631
632	Zero(&myop, 1, UNOP);
633	myop.op_next = Nullop;
634	myop.op_flags = OPf_WANT_VOID;
635
636	PUSHMARK(SP);
637	XPUSHs (sub_init);
638	/*
639	* the next line is slightly wrong, as PL_op->op_next
640	* is actually being executed so we skip the first op.
641	* that doesn't matter, though, since it is only
642	* pp_nextstate and we never return...
643	* ah yes, and I don't care anyways ;)
644	*/
645	PUTBACK;
646	PL_op = pp_entersub();
647	SPAGAIN;
648
649	ENTER; /* necessary e.g. for dounwind */
650	}
651	}	826	}
652		827
653	static void	828	static void
654	continue_coro (void *arg)	829	free_coro_mortal (pTHX)
655	{	830	{
656	/*	831	if (expect_true (coro_mortal))
657	* this is a _very_ stripped down perl interpreter ;)	832	{
658	*/	833	SvREFCNT_dec (coro_mortal);
659	Coro__State ctx = (Coro__State)arg;	834	coro_mortal = 0;
660
661	ctx->cursp = 0;
662	PL_op = PL_op->op_next;
663	CALLRUNOPS(aTHX);
664	/*NORETURN*/
665	abort ();
666	}
667
668	STATIC void
669	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
670	{
671	dSP;
672	dSTACKLEVEL;
673
674	if (prev != next)
675	{	835	}
676	if (next->mainstack)	836	}
		837
		838	static int
		839	runops_trace (pTHX)
		840	{
		841	COP *oldcop = 0;
		842	int oldcxix = -2;
		843	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		844	coro_cctx *cctx = coro->cctx;
		845
		846	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		847	{
		848	PERL_ASYNC_CHECK ();
		849
		850	if (cctx->flags & CC_TRACE_ALL)
677	{	851	{
678	SAVE (prev, flags);	852	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
679	LOAD (next);
680
681	/* mark this state as in-use */
682	next->mainstack = 0;
683	next->tmps_ix = -2;
684
685	/* stacklevel changed? if yes, grab the stack for us! */
686	if (flags & TRANSFER_SAVE_CCTXT)
687	{	853	{
688	if (!prev->stack)	854	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
689	allocate_stack (prev, 0);	855	SV **bot, **top;
690	else if (prev->cursp != stacklevel	856	AV *av = newAV (); /* return values */
691	&& prev->stack->usecnt > 1)	857	SV **cb;
		858	dSP;
		859
		860	GV *gv = CvGV (cx->blk_sub.cv);
		861	SV *fullname = sv_2mortal (newSV (0));
		862	if (isGV (gv))
		863	gv_efullname3 (fullname, gv, 0);
		864
		865	bot = PL_stack_base + cx->blk_oldsp + 1;
		866	top = cx->blk_gimme == G_ARRAY ? SP + 1
		867	: cx->blk_gimme == G_SCALAR ? bot + 1
		868	: bot;
		869
		870	av_extend (av, top - bot);
		871	while (bot < top)
		872	av_push (av, SvREFCNT_inc (*bot++));
		873
		874	PL_runops = RUNOPS_DEFAULT;
		875	ENTER;
		876	SAVETMPS;
		877	EXTEND (SP, 3);
		878	PUSHMARK (SP);
		879	PUSHs (&PL_sv_no);
		880	PUSHs (fullname);
		881	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		882	PUTBACK;
		883	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		884	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		885	SPAGAIN;
		886	FREETMPS;
		887	LEAVE;
		888	PL_runops = runops_trace;
		889	}
		890
		891	if (oldcop != PL_curcop)
		892	{
		893	oldcop = PL_curcop;
		894
		895	if (PL_curcop != &PL_compiling)
692	{	896	{
693	prev->gencnt = ++prev->stack->gencnt;	897	SV **cb;
694	prev->stack->usecnt = 1;
695	}
696		898
697	/* has our stack been invalidated? */	899	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
698	if (next->stack && next->stack->gencnt != next->gencnt)
699	{	900	{
700	deallocate_stack (next);	901	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
701	allocate_stack (next, 1);	902
702	coro_create (&(next->stack->cctx),	903	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
703	continue_coro, (void *)next,	904	{
704	next->stack->sptr, labs (next->stack->ssize));	905	runops_proc_t old_runops = PL_runops;
		906	dSP;
		907	GV *gv = CvGV (cx->blk_sub.cv);
		908	SV *fullname = sv_2mortal (newSV (0));
		909
		910	if (isGV (gv))
		911	gv_efullname3 (fullname, gv, 0);
		912
		913	PL_runops = RUNOPS_DEFAULT;
		914	ENTER;
		915	SAVETMPS;
		916	EXTEND (SP, 3);
		917	PUSHMARK (SP);
		918	PUSHs (&PL_sv_yes);
		919	PUSHs (fullname);
		920	PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		921	PUTBACK;
		922	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		923	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		924	SPAGAIN;
		925	FREETMPS;
		926	LEAVE;
		927	PL_runops = runops_trace;
		928	}
		929
		930	oldcxix = cxstack_ix;
705	}	931	}
706		932
707	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));	933	if (cctx->flags & CC_TRACE_LINE)
708	}
709
710	}
711	else if (next->tmps_ix == -2)
712	croak ("tried to transfer to running coroutine");
713	else
714	{
715	SAVE (prev, -1); /* first get rid of the old state */
716
717	if (flags & TRANSFER_SAVE_CCTXT)
718	{
719	if (!prev->stack)
720	allocate_stack (prev, 0);
721
722	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
723	{	934	{
724	setup_coro (next);	935	dSP;
725		936
726	prev->stack->refcnt++;	937	PL_runops = RUNOPS_DEFAULT;
727	prev->stack->usecnt++;	938	ENTER;
728	next->stack = prev->stack;	939	SAVETMPS;
729	next->gencnt = prev->gencnt;	940	EXTEND (SP, 3);
		941	PL_runops = RUNOPS_DEFAULT;
		942	PUSHMARK (SP);
		943	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		944	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		945	PUTBACK;
		946	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		947	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		948	SPAGAIN;
		949	FREETMPS;
		950	LEAVE;
		951	PL_runops = runops_trace;
730	}	952	}
731	else
732	{
733	allocate_stack (next, 1);
734	coro_create (&(next->stack->cctx),
735	setup_coro, (void *)next,
736	next->stack->sptr, labs (next->stack->ssize));
737	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
738	}	953	}
739	}	954	}
740	else
741	setup_coro (next);
742	}	955	}
743	}	956	}
744		957
745	next->cursp = stacklevel;	958	TAINT_NOT;
		959	return 0;
746	}	960	}
747		961
		962	/* inject a fake call to Coro::State::_cctx_init into the execution */
		963	/* _cctx_init should be careful, as it could be called at almost any time */
		964	/* during execution of a perl program */
		965	static void NOINLINE
		966	cctx_prepare (pTHX_ coro_cctx *cctx)
		967	{
		968	dSP;
		969	LOGOP myop;
		970
		971	PL_top_env = &PL_start_env;
		972
		973	if (cctx->flags & CC_TRACE)
		974	PL_runops = runops_trace;
		975
		976	Zero (&myop, 1, LOGOP);
		977	myop.op_next = PL_op;
		978	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		979
		980	PUSHMARK (SP);
		981	EXTEND (SP, 2);
		982	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		983	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		984	PUTBACK;
		985	PL_op = (OP *)&myop;
		986	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		987	SPAGAIN;
		988	}
		989
		990	/*
		991	* this is a _very_ stripped down perl interpreter ;)
		992	*/
		993	static void
		994	cctx_run (void *arg)
		995	{
		996	dTHX;
		997
		998	/* cctx_run is the alternative tail of transfer(), so unlock here. */
		999	UNLOCK;
		1000
		1001	/* we now skip the entersub that lead to transfer() */
		1002	PL_op = PL_op->op_next;
		1003
		1004	/* inject a fake subroutine call to cctx_init */
		1005	cctx_prepare (aTHX_ (coro_cctx *)arg);
		1006
		1007	/* somebody or something will hit me for both perl_run and PL_restartop */
		1008	PL_restartop = PL_op;
		1009	perl_run (PL_curinterp);
		1010
		1011	/*
		1012	* If perl-run returns we assume exit() was being called or the coro
		1013	* fell off the end, which seems to be the only valid (non-bug)
		1014	* reason for perl_run to return. We try to exit by jumping to the
		1015	* bootstrap-time "top" top_env, as we cannot restore the "main"
		1016	* coroutine as Coro has no such concept
		1017	*/
		1018	PL_top_env = main_top_env;
		1019	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		1020	}
		1021
		1022	static coro_cctx *
		1023	cctx_new ()
		1024	{
		1025	coro_cctx *cctx;
		1026	void *stack_start;
		1027	size_t stack_size;
		1028
		1029	++cctx_count;
		1030
		1031	Newz (0, cctx, 1, coro_cctx);
		1032
		1033	#if HAVE_MMAP
		1034	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		1035	/* mmap supposedly does allocate-on-write for us */
		1036	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		1037
		1038	if (cctx->sptr != (void *)-1)
		1039	{
		1040	# if CORO_STACKGUARD
		1041	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		1042	# endif
		1043	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		1044	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		1045	cctx->flags |= CC_MAPPED;
		1046	}
		1047	else
		1048	#endif
		1049	{
		1050	cctx->ssize = coro_stacksize * (long)sizeof (long);
		1051	New (0, cctx->sptr, coro_stacksize, long);
		1052
		1053	if (!cctx->sptr)
		1054	{
		1055	perror ("FATAL: unable to allocate stack for coroutine");
		1056	_exit (EXIT_FAILURE);
		1057	}
		1058
		1059	stack_start = cctx->sptr;
		1060	stack_size = cctx->ssize;
		1061	}
		1062
		1063	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1064	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
		1065
		1066	return cctx;
		1067	}
		1068
		1069	static void
		1070	cctx_destroy (coro_cctx *cctx)
		1071	{
		1072	if (!cctx)
		1073	return;
		1074
		1075	--cctx_count;
		1076
		1077	#if CORO_USE_VALGRIND
		1078	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		1079	#endif
		1080
		1081	#if HAVE_MMAP
		1082	if (cctx->flags & CC_MAPPED)
		1083	munmap (cctx->sptr, cctx->ssize);
		1084	else
		1085	#endif
		1086	Safefree (cctx->sptr);
		1087
		1088	Safefree (cctx);
		1089	}
		1090
		1091	/* wether this cctx should be destructed */
		1092	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1093
		1094	static coro_cctx *
		1095	cctx_get (pTHX)
		1096	{
		1097	while (expect_true (cctx_first))
		1098	{
		1099	coro_cctx *cctx = cctx_first;
		1100	cctx_first = cctx->next;
		1101	--cctx_idle;
		1102
		1103	if (expect_true (!CCTX_EXPIRED (cctx)))
		1104	return cctx;
		1105
		1106	cctx_destroy (cctx);
		1107	}
		1108
		1109	return cctx_new ();
		1110	}
		1111
		1112	static void
		1113	cctx_put (coro_cctx *cctx)
		1114	{
		1115	/* free another cctx if overlimit */
		1116	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		1117	{
		1118	coro_cctx *first = cctx_first;
		1119	cctx_first = first->next;
		1120	--cctx_idle;
		1121
		1122	cctx_destroy (first);
		1123	}
		1124
		1125	++cctx_idle;
		1126	cctx->next = cctx_first;
		1127	cctx_first = cctx;
		1128	}
		1129
		1130	/** coroutine switching *****************************************************/
		1131
		1132	static void
		1133	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1134	{
		1135	if (expect_true (prev != next))
		1136	{
		1137	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1138	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1139
		1140	if (expect_false (next->flags & CF_RUNNING))
		1141	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1142
		1143	if (expect_false (next->flags & CF_DESTROYED))
		1144	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1145
		1146	#if !PERL_VERSION_ATLEAST (5,10,0)
		1147	if (expect_false (PL_lex_state != LEX_NOTPARSING))
		1148	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version");
		1149	#endif
		1150	}
		1151	}
		1152
		1153	/* always use the TRANSFER macro */
		1154	static void NOINLINE
		1155	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
		1156	{
		1157	dSTACKLEVEL;
		1158	static volatile int has_throw;
		1159
		1160	/* sometimes transfer is only called to set idle_sp */
		1161	if (expect_false (!next))
		1162	{
		1163	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1164	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		1165	}
		1166	else if (expect_true (prev != next))
		1167	{
		1168	coro_cctx *prev__cctx;
		1169
		1170	if (expect_false (prev->flags & CF_NEW))
		1171	{
		1172	/* create a new empty context */
		1173	Newz (0, prev->cctx, 1, coro_cctx);
		1174	prev->flags &= ~CF_NEW;
		1175	prev->flags |= CF_RUNNING;
		1176	}
		1177
		1178	prev->flags &= ~CF_RUNNING;
		1179	next->flags |= CF_RUNNING;
		1180
		1181	LOCK;
		1182
		1183	/* first get rid of the old state */
		1184	save_perl (aTHX_ prev);
		1185
		1186	if (expect_false (next->flags & CF_NEW))
		1187	{
		1188	/* need to start coroutine */
		1189	next->flags &= ~CF_NEW;
		1190	/* setup coroutine call */
		1191	coro_setup (aTHX_ next);
		1192	}
		1193	else
		1194	load_perl (aTHX_ next);
		1195
		1196	prev__cctx = prev->cctx;
		1197
		1198	/* possibly "free" the cctx */
		1199	if (expect_true (
		1200	prev__cctx->idle_sp == STACKLEVEL
		1201	&& !(prev__cctx->flags & CC_TRACE)
		1202	&& !force_cctx
		1203	))
		1204	{
		1205	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1206	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1207
		1208	prev->cctx = 0;
		1209
		1210	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1211	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1212	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1213	if (!next->cctx)
		1214	next->cctx = cctx_get (aTHX);
		1215
		1216	cctx_put (prev__cctx);
		1217	}
		1218
		1219	++next->usecount;
		1220
		1221	if (expect_true (!next->cctx))
		1222	next->cctx = cctx_get (aTHX);
		1223
		1224	has_throw = !!next->throw;
		1225
		1226	if (expect_false (prev__cctx != next->cctx))
		1227	{
		1228	prev__cctx->top_env = PL_top_env;
		1229	PL_top_env = next->cctx->top_env;
		1230	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1231	}
		1232
		1233	free_coro_mortal (aTHX);
		1234	UNLOCK;
		1235
		1236	if (expect_false (has_throw))
		1237	{
		1238	struct coro *coro = SvSTATE (coro_current);
		1239
		1240	if (coro->throw)
		1241	{
		1242	SV *exception = coro->throw;
		1243	coro->throw = 0;
		1244	sv_setsv (ERRSV, exception);
		1245	croak (0);
		1246	}
		1247	}
		1248	}
		1249	}
		1250
		1251	struct transfer_args
		1252	{
		1253	struct coro *prev, *next;
		1254	};
		1255
		1256	#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
		1257	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1258
		1259	/** high level stuff ********************************************************/
		1260
		1261	static int
		1262	coro_state_destroy (pTHX_ struct coro *coro)
		1263	{
		1264	if (coro->flags & CF_DESTROYED)
		1265	return 0;
		1266
		1267	coro->flags |= CF_DESTROYED;
		1268
		1269	if (coro->flags & CF_READY)
		1270	{
		1271	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1272	/* alternative: look through all ready queues and remove the coro */
		1273	LOCK;
		1274	--coro_nready;
		1275	UNLOCK;
		1276	}
		1277	else
		1278	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
		1279
		1280	if (coro->mainstack && coro->mainstack != main_mainstack)
		1281	{
		1282	struct coro temp;
		1283
		1284	if (coro->flags & CF_RUNNING)
		1285	croak ("FATAL: tried to destroy currently running coroutine");
		1286
		1287	save_perl (aTHX_ &temp);
		1288	load_perl (aTHX_ coro);
		1289
		1290	coro_destroy (aTHX_ coro);
		1291
		1292	load_perl (aTHX_ &temp);
		1293
		1294	coro->slot = 0;
		1295	}
		1296
		1297	cctx_destroy (coro->cctx);
		1298	SvREFCNT_dec (coro->args);
		1299
		1300	if (coro->next) coro->next->prev = coro->prev;
		1301	if (coro->prev) coro->prev->next = coro->next;
		1302	if (coro == coro_first) coro_first = coro->next;
		1303
		1304	return 1;
		1305	}
		1306
		1307	static int
		1308	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1309	{
		1310	struct coro *coro = (struct coro *)mg->mg_ptr;
		1311	mg->mg_ptr = 0;
		1312
		1313	coro->hv = 0;
		1314
		1315	if (--coro->refcnt < 0)
		1316	{
		1317	coro_state_destroy (aTHX_ coro);
		1318	Safefree (coro);
		1319	}
		1320
		1321	return 0;
		1322	}
		1323
		1324	static int
		1325	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1326	{
		1327	struct coro *coro = (struct coro *)mg->mg_ptr;
		1328
		1329	++coro->refcnt;
		1330
		1331	return 0;
		1332	}
		1333
		1334	static MGVTBL coro_state_vtbl = {
		1335	0, 0, 0, 0,
		1336	coro_state_free,
		1337	0,
		1338	#ifdef MGf_DUP
		1339	coro_state_dup,
		1340	#else
		1341	# define MGf_DUP 0
		1342	#endif
		1343	};
		1344
		1345	static void
		1346	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1347	{
		1348	ta->prev = SvSTATE (prev_sv);
		1349	ta->next = SvSTATE (next_sv);
		1350	TRANSFER_CHECK (*ta);
		1351	}
		1352
		1353	static void
		1354	api_transfer (SV *prev_sv, SV *next_sv)
		1355	{
		1356	dTHX;
		1357	struct transfer_args ta;
		1358
		1359	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1360	TRANSFER (ta, 1);
		1361	}
		1362
		1363	/** Coro ********************************************************************/
		1364
		1365	static void
		1366	coro_enq (pTHX_ SV *coro_sv)
		1367	{
		1368	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		1369	}
		1370
		1371	static SV *
		1372	coro_deq (pTHX)
		1373	{
		1374	int prio;
		1375
		1376	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
		1377	if (AvFILLp (coro_ready [prio]) >= 0)
		1378	return av_shift (coro_ready [prio]);
		1379
		1380	return 0;
		1381	}
		1382
		1383	static int
		1384	api_ready (SV *coro_sv)
		1385	{
		1386	dTHX;
		1387	struct coro *coro;
		1388	SV *sv_hook;
		1389	void (*xs_hook)(void);
		1390
		1391	if (SvROK (coro_sv))
		1392	coro_sv = SvRV (coro_sv);
		1393
		1394	coro = SvSTATE (coro_sv);
		1395
		1396	if (coro->flags & CF_READY)
		1397	return 0;
		1398
		1399	coro->flags |= CF_READY;
		1400
		1401	LOCK;
		1402
		1403	sv_hook = coro_nready ? 0 : coro_readyhook;
		1404	xs_hook = coro_nready ? 0 : coroapi.readyhook;
		1405
		1406	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1407	++coro_nready;
		1408
		1409	UNLOCK;
		1410
		1411	if (sv_hook)
		1412	{
		1413	dSP;
		1414
		1415	ENTER;
		1416	SAVETMPS;
		1417
		1418	PUSHMARK (SP);
		1419	PUTBACK;
		1420	call_sv (sv_hook, G_DISCARD);
		1421	SPAGAIN;
		1422
		1423	FREETMPS;
		1424	LEAVE;
		1425	}
		1426
		1427	if (xs_hook)
		1428	xs_hook ();
		1429
		1430	return 1;
		1431	}
		1432
		1433	static int
		1434	api_is_ready (SV *coro_sv)
		1435	{
		1436	dTHX;
		1437	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1438	}
		1439
		1440	static void
		1441	prepare_schedule (pTHX_ struct transfer_args *ta)
		1442	{
		1443	SV *prev_sv, *next_sv;
		1444
		1445	for (;;)
		1446	{
		1447	LOCK;
		1448	next_sv = coro_deq (aTHX);
		1449
		1450	/* nothing to schedule: call the idle handler */
		1451	if (expect_false (!next_sv))
		1452	{
		1453	dSP;
		1454	UNLOCK;
		1455
		1456	ENTER;
		1457	SAVETMPS;
		1458
		1459	PUSHMARK (SP);
		1460	PUTBACK;
		1461	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1462	SPAGAIN;
		1463
		1464	FREETMPS;
		1465	LEAVE;
		1466	continue;
		1467	}
		1468
		1469	ta->next = SvSTATE (next_sv);
		1470
		1471	/* cannot transfer to destroyed coros, skip and look for next */
		1472	if (expect_false (ta->next->flags & CF_DESTROYED))
		1473	{
		1474	UNLOCK;
		1475	SvREFCNT_dec (next_sv);
		1476	/* coro_nready is already taken care of by destroy */
		1477	continue;
		1478	}
		1479
		1480	--coro_nready;
		1481	UNLOCK;
		1482	break;
		1483	}
		1484
		1485	/* free this only after the transfer */
		1486	prev_sv = SvRV (coro_current);
		1487	ta->prev = SvSTATE (prev_sv);
		1488	TRANSFER_CHECK (*ta);
		1489	assert (ta->next->flags & CF_READY);
		1490	ta->next->flags &= ~CF_READY;
		1491	SvRV_set (coro_current, next_sv);
		1492
		1493	LOCK;
		1494	free_coro_mortal (aTHX);
		1495	coro_mortal = prev_sv;
		1496	UNLOCK;
		1497	}
		1498
		1499	static void
		1500	prepare_cede (pTHX_ struct transfer_args *ta)
		1501	{
		1502	api_ready (coro_current);
		1503	prepare_schedule (aTHX_ ta);
		1504	}
		1505
		1506	static int
		1507	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1508	{
		1509	if (coro_nready)
		1510	{
		1511	SV *prev = SvRV (coro_current);
		1512	prepare_schedule (aTHX_ ta);
		1513	api_ready (prev);
		1514	return 1;
		1515	}
		1516	else
		1517	return 0;
		1518	}
		1519
		1520	static void
		1521	api_schedule (void)
		1522	{
		1523	dTHX;
		1524	struct transfer_args ta;
		1525
		1526	prepare_schedule (aTHX_ &ta);
		1527	TRANSFER (ta, 1);
		1528	}
		1529
		1530	static int
		1531	api_cede (void)
		1532	{
		1533	dTHX;
		1534	struct transfer_args ta;
		1535
		1536	prepare_cede (aTHX_ &ta);
		1537
		1538	if (expect_true (ta.prev != ta.next))
		1539	{
		1540	TRANSFER (ta, 1);
		1541	return 1;
		1542	}
		1543	else
		1544	return 0;
		1545	}
		1546
		1547	static int
		1548	api_cede_notself (void)
		1549	{
		1550	dTHX;
		1551	struct transfer_args ta;
		1552
		1553	if (prepare_cede_notself (aTHX_ &ta))
		1554	{
		1555	TRANSFER (ta, 1);
		1556	return 1;
		1557	}
		1558	else
		1559	return 0;
		1560	}
		1561
		1562	static void
		1563	api_trace (SV *coro_sv, int flags)
		1564	{
		1565	dTHX;
		1566	struct coro *coro = SvSTATE (coro_sv);
		1567
		1568	if (flags & CC_TRACE)
		1569	{
		1570	if (!coro->cctx)
		1571	coro->cctx = cctx_new ();
		1572	else if (!(coro->cctx->flags & CC_TRACE))
		1573	croak ("cannot enable tracing on coroutine with custom stack");
		1574
		1575	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1576	}
		1577	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1578	{
		1579	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1580
		1581	if (coro->flags & CF_RUNNING)
		1582	PL_runops = RUNOPS_DEFAULT;
		1583	else
		1584	coro->slot->runops = RUNOPS_DEFAULT;
		1585	}
		1586	}
		1587
748	MODULE = Coro::State PACKAGE = Coro::State	1588	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
749		1589
750	PROTOTYPES: ENABLE	1590	PROTOTYPES: DISABLE
751		1591
752	BOOT:	1592	BOOT:
753	{ /* {} necessary for stoopid perl-5.6.x */	1593	{
754	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1594	#ifdef USE_ITHREADS
755	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1595	MUTEX_INIT (&coro_mutex);
		1596	#endif
		1597	BOOT_PAGESIZE;
		1598
		1599	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1600	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1601
		1602	orig_sigelem_get = PL_vtbl_sigelem.svt_get;
		1603	PL_vtbl_sigelem.svt_get = coro_sigelem_get;
		1604	orig_sigelem_set = PL_vtbl_sigelem.svt_set;
		1605	PL_vtbl_sigelem.svt_set = coro_sigelem_set;
		1606
		1607	hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
		1608	rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
		1609	rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
		1610
756	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1611	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
757		1612
758	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1613	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
759	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1614	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
760	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1615	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
761	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1616	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
762
763	if (!padlist_cache)
764	padlist_cache = newHV ();
765		1617
766	main_mainstack = PL_mainstack;	1618	main_mainstack = PL_mainstack;
767	}	1619	main_top_env = PL_top_env;
768		1620
769	Coro::State	1621	while (main_top_env->je_prev)
770	_newprocess(args)	1622	main_top_env = main_top_env->je_prev;
771	SV * args	1623
772	PROTOTYPE: $	1624	coroapi.ver = CORO_API_VERSION;
		1625	coroapi.rev = CORO_API_REVISION;
		1626	coroapi.transfer = api_transfer;
		1627
		1628	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1629	}
		1630
		1631	SV *
		1632	new (char *klass, ...)
773	CODE:	1633	CODE:
774	Coro__State coro;	1634	{
		1635	struct coro *coro;
		1636	MAGIC *mg;
		1637	HV *hv;
		1638	int i;
775		1639
776	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
777	croak ("Coro::State::_newprocess expects an arrayref");
778
779	New (0, coro, 1, struct coro);	1640	Newz (0, coro, 1, struct coro);
		1641	coro->args = newAV ();
		1642	coro->flags = CF_NEW;
780		1643
781	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1644	if (coro_first) coro_first->prev = coro;
782	coro->mainstack = 0; /* actual work is done inside transfer */	1645	coro->next = coro_first;
783	coro->stack = 0;	1646	coro_first = coro;
784		1647
785	RETVAL = coro;	1648	coro->hv = hv = newHV ();
		1649	mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
		1650	mg->mg_flags |= MGf_DUP;
		1651	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1652
		1653	av_extend (coro->args, items - 1);
		1654	for (i = 1; i < items; i++)
		1655	av_push (coro->args, newSVsv (ST (i)));
		1656	}
786	OUTPUT:	1657	OUTPUT:
787	RETVAL	1658	RETVAL
788		1659
		1660	# these not obviously related functions are all rolled into the same xs
		1661	# function to increase chances that they all will call transfer with the same
		1662	# stack offset
789	void	1663	void
790	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1664	_set_stacklevel (...)
791	Coro::State_or_hashref prev	1665	ALIAS:
792	Coro::State_or_hashref next	1666	Coro::State::transfer = 1
793	int flags	1667	Coro::schedule = 2
794	PROTOTYPE: @	1668	Coro::cede = 3
		1669	Coro::cede_notself = 4
795	CODE:	1670	CODE:
796	transfer (aTHX_ prev, next, flags);	1671	{
		1672	struct transfer_args ta;
		1673
		1674	PUTBACK;
		1675	switch (ix)
		1676	{
		1677	case 0:
		1678	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1679	ta.next = 0;
		1680	break;
		1681
		1682	case 1:
		1683	if (items != 2)
		1684	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1685
		1686	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1687	break;
		1688
		1689	case 2:
		1690	prepare_schedule (aTHX_ &ta);
		1691	break;
		1692
		1693	case 3:
		1694	prepare_cede (aTHX_ &ta);
		1695	break;
		1696
		1697	case 4:
		1698	if (!prepare_cede_notself (aTHX_ &ta))
		1699	XSRETURN_EMPTY;
		1700
		1701	break;
		1702	}
		1703	SPAGAIN;
		1704
		1705	BARRIER;
		1706	PUTBACK;
		1707	TRANSFER (ta, 0);
		1708	SPAGAIN; /* might be the sp of a different coroutine now */
		1709	/* be extra careful not to ever do anything after TRANSFER */
		1710	}
		1711
		1712	bool
		1713	_destroy (SV *coro_sv)
		1714	CODE:
		1715	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1716	OUTPUT:
		1717	RETVAL
797		1718
798	void	1719	void
799	DESTROY(coro)	1720	_exit (int code)
800	Coro::State coro	1721	PROTOTYPE: $
801	CODE:	1722	CODE:
		1723	_exit (code);
802		1724
803	if (coro->mainstack && coro->mainstack != main_mainstack)	1725	int
		1726	cctx_stacksize (int new_stacksize = 0)
		1727	CODE:
		1728	RETVAL = coro_stacksize;
		1729	if (new_stacksize)
		1730	coro_stacksize = new_stacksize;
		1731	OUTPUT:
		1732	RETVAL
		1733
		1734	int
		1735	cctx_count ()
		1736	CODE:
		1737	RETVAL = cctx_count;
		1738	OUTPUT:
		1739	RETVAL
		1740
		1741	int
		1742	cctx_idle ()
		1743	CODE:
		1744	RETVAL = cctx_idle;
		1745	OUTPUT:
		1746	RETVAL
		1747
		1748	void
		1749	list ()
		1750	PPCODE:
		1751	{
		1752	struct coro *coro;
		1753	for (coro = coro_first; coro; coro = coro->next)
		1754	if (coro->hv)
		1755	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1756	}
		1757
		1758	void
		1759	call (Coro::State coro, SV *coderef)
		1760	ALIAS:
		1761	eval = 1
		1762	CODE:
		1763	{
		1764	if (coro->mainstack)
804	{	1765	{
805	struct coro temp;	1766	struct coro temp;
806		1767
807	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1768	if (!(coro->flags & CF_RUNNING))
808	LOAD(aTHX_ coro);	1769	{
		1770	PUTBACK;
		1771	save_perl (aTHX_ &temp);
		1772	load_perl (aTHX_ coro);
		1773	}
809		1774
810	destroy_stacks (aTHX);	1775	{
		1776	dSP;
		1777	ENTER;
		1778	SAVETMPS;
		1779	PUTBACK;
		1780	PUSHSTACK;
		1781	PUSHMARK (SP);
811		1782
812	LOAD((&temp)); /* this will get rid of defsv etc.. */	1783	if (ix)
		1784	eval_sv (coderef, 0);
		1785	else
		1786	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
813		1787
814	coro->mainstack = 0;	1788	POPSTACK;
		1789	SPAGAIN;
		1790	FREETMPS;
		1791	LEAVE;
		1792	PUTBACK;
		1793	}
		1794
		1795	if (!(coro->flags & CF_RUNNING))
		1796	{
		1797	save_perl (aTHX_ coro);
		1798	load_perl (aTHX_ &temp);
		1799	SPAGAIN;
		1800	}
815	}	1801	}
		1802	}
816		1803
817	deallocate_stack (coro);	1804	SV *
818		1805	is_ready (Coro::State coro)
819	Safefree (coro);	1806	PROTOTYPE: $
		1807	ALIAS:
		1808	is_ready = CF_READY
		1809	is_running = CF_RUNNING
		1810	is_new = CF_NEW
		1811	is_destroyed = CF_DESTROYED
		1812	CODE:
		1813	RETVAL = boolSV (coro->flags & ix);
		1814	OUTPUT:
		1815	RETVAL
820		1816
821	void	1817	void
822	flush()	1818	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1819
		1820	SV *
		1821	has_cctx (Coro::State coro)
		1822	PROTOTYPE: $
823	CODE:	1823	CODE:
824	#ifdef MAY_FLUSH	1824	RETVAL = boolSV (!!coro->cctx);
825	flush_padlist_cache ();	1825	OUTPUT:
826	#endif	1826	RETVAL
827		1827
828	MODULE = Coro::State PACKAGE = Coro::Cont	1828	int
		1829	is_traced (Coro::State coro)
		1830	PROTOTYPE: $
		1831	CODE:
		1832	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1833	OUTPUT:
		1834	RETVAL
829		1835
830	# this is slightly dirty	1836	IV
		1837	rss (Coro::State coro)
		1838	PROTOTYPE: $
		1839	ALIAS:
		1840	usecount = 1
		1841	CODE:
		1842	switch (ix)
		1843	{
		1844	case 0: RETVAL = coro_rss (aTHX_ coro); break;
		1845	case 1: RETVAL = coro->usecount; break;
		1846	}
		1847	OUTPUT:
		1848	RETVAL
831		1849
832	void	1850	void
833	yield(...)	1851	force_cctx ()
		1852	CODE:
		1853	struct coro *coro = SvSTATE (coro_current);
		1854	coro->cctx->idle_sp = 0;
		1855
		1856	MODULE = Coro::State PACKAGE = Coro
		1857
		1858	BOOT:
		1859	{
		1860	int i;
		1861
		1862	av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
		1863	sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
		1864	sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
		1865
		1866	coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
		1867	SvREADONLY_on (coro_current);
		1868
		1869	coro_stash = gv_stashpv ("Coro", TRUE);
		1870
		1871	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1872	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1873	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1874	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1875	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1876	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1877
		1878	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1879	coro_ready[i] = newAV ();
		1880
		1881	{
		1882	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1883	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
		1884
		1885	coroapi.schedule = api_schedule;
		1886	coroapi.cede = api_cede;
		1887	coroapi.cede_notself = api_cede_notself;
		1888	coroapi.ready = api_ready;
		1889	coroapi.is_ready = api_is_ready;
		1890	coroapi.nready = &coro_nready;
		1891	coroapi.current = coro_current;
		1892
		1893	GCoroAPI = &coroapi;
		1894	sv_setiv (sv, (IV)&coroapi);
		1895	SvREADONLY_on (sv);
		1896	}
		1897	}
		1898
		1899	void
		1900	_set_current (SV *current)
		1901	PROTOTYPE: $
		1902	CODE:
		1903	SvREFCNT_dec (SvRV (coro_current));
		1904	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1905
		1906	void
		1907	_set_readyhook (SV *hook)
		1908	PROTOTYPE: $
		1909	CODE:
		1910	LOCK;
		1911	SvREFCNT_dec (coro_readyhook);
		1912	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
		1913	UNLOCK;
		1914
		1915	int
		1916	prio (Coro::State coro, int newprio = 0)
		1917	ALIAS:
		1918	nice = 1
		1919	CODE:
		1920	{
		1921	RETVAL = coro->prio;
		1922
		1923	if (items > 1)
		1924	{
		1925	if (ix)
		1926	newprio = coro->prio - newprio;
		1927
		1928	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1929	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1930
		1931	coro->prio = newprio;
		1932	}
		1933	}
		1934	OUTPUT:
		1935	RETVAL
		1936
		1937	SV *
		1938	ready (SV *self)
		1939	PROTOTYPE: $
		1940	CODE:
		1941	RETVAL = boolSV (api_ready (self));
		1942	OUTPUT:
		1943	RETVAL
		1944
		1945	int
		1946	nready (...)
		1947	PROTOTYPE:
		1948	CODE:
		1949	RETVAL = coro_nready;
		1950	OUTPUT:
		1951	RETVAL
		1952
		1953	void
		1954	throw (Coro::State self, SV *throw = &PL_sv_undef)
		1955	PROTOTYPE: $;$
		1956	CODE:
		1957	SvREFCNT_dec (self->throw);
		1958	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1959
		1960	void
		1961	swap_defsv (Coro::State self)
		1962	PROTOTYPE: $
		1963	ALIAS:
		1964	swap_defav = 1
		1965	CODE:
		1966	if (!self->slot)
		1967	croak ("cannot swap state with coroutine that has no saved state");
		1968	else
		1969	{
		1970	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
		1971	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
		1972
		1973	SV *tmp = *src; *src = *dst; *dst = tmp;
		1974	}
		1975
		1976	# for async_pool speedup
		1977	void
		1978	_pool_1 (SV *cb)
		1979	CODE:
		1980	{
		1981	struct coro *coro = SvSTATE (coro_current);
		1982	HV *hv = (HV *)SvRV (coro_current);
		1983	AV *defav = GvAV (PL_defgv);
		1984	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1985	AV *invoke_av;
		1986	int i, len;
		1987
		1988	if (!invoke)
		1989	{
		1990	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		1991	croak ("\3async_pool terminate\2\n");
		1992	}
		1993
		1994	SvREFCNT_dec (coro->saved_deffh);
		1995	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1996
		1997	hv_store (hv, "desc", sizeof ("desc") - 1,
		1998	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1999
		2000	invoke_av = (AV *)SvRV (invoke);
		2001	len = av_len (invoke_av);
		2002
		2003	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		2004
		2005	if (len > 0)
		2006	{
		2007	av_fill (defav, len - 1);
		2008	for (i = 0; i < len; ++i)
		2009	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		2010	}
		2011
		2012	SvREFCNT_dec (invoke);
		2013	}
		2014
		2015	void
		2016	_pool_2 (SV *cb)
		2017	CODE:
		2018	{
		2019	struct coro *coro = SvSTATE (coro_current);
		2020
		2021	sv_setsv (cb, &PL_sv_undef);
		2022
		2023	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		2024	coro->saved_deffh = 0;
		2025
		2026	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		2027	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		2028	{
		2029	SvREFCNT_dec (PL_diehook); PL_diehook = 0;
		2030	croak ("\3async_pool terminate\2\n");
		2031	}
		2032
		2033	av_clear (GvAV (PL_defgv));
		2034	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		2035	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		2036
		2037	coro->prio = 0;
		2038
		2039	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		2040	api_trace (coro_current, 0);
		2041
		2042	av_push (av_async_pool, newSVsv (coro_current));
		2043	}
		2044
		2045
		2046	MODULE = Coro::State PACKAGE = Coro::AIO
		2047
		2048	SV *
		2049	_get_state ()
		2050	CODE:
		2051	{
		2052	struct io_state *data;
		2053
		2054	RETVAL = newSV (sizeof (struct io_state));
		2055	data = (struct io_state *)SvPVX (RETVAL);
		2056	SvCUR_set (RETVAL, sizeof (struct io_state));
		2057	SvPOK_only (RETVAL);
		2058
		2059	data->errorno = errno;
		2060	data->laststype = PL_laststype;
		2061	data->laststatval = PL_laststatval;
		2062	data->statcache = PL_statcache;
		2063	}
		2064	OUTPUT:
		2065	RETVAL
		2066
		2067	void
		2068	_set_state (char *data_)
		2069	PROTOTYPE: $
		2070	CODE:
		2071	{
		2072	struct io_state *data = (void *)data_;
		2073
		2074	errno = data->errorno;
		2075	PL_laststype = data->laststype;
		2076	PL_laststatval = data->laststatval;
		2077	PL_statcache = data->statcache;
		2078	}
		2079
		2080
		2081	MODULE = Coro::State PACKAGE = Coro::AnyEvent
		2082
		2083	BOOT:
		2084	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
		2085
		2086	SV *
		2087	_schedule (...)
834	PROTOTYPE: @	2088	PROTOTYPE: @
835	CODE:	2089	CODE:
836	static SV *returnstk;	2090	{
837	SV *sv;	2091	static int incede;
838	AV *defav = GvAV (PL_defgv);
839	struct coro *prev, *next;
840		2092
841	if (!returnstk)	2093	api_cede_notself ();
842	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
843		2094
844	/* set up @_ -- ugly */	2095	++incede;
845	av_clear (defav);	2096	while (coro_nready >= incede && api_cede ())
846	av_fill (defav, items - 1);	2097	;
847	while (items--)
848	av_store (defav, items, SvREFCNT_inc (ST(items)));
849		2098
850	mg_get (returnstk); /* isn't documentation wrong for mg_get? */	2099	sv_setsv (sv_activity, &PL_sv_undef);
851	sv = av_pop ((AV *)SvRV (returnstk));	2100	if (coro_nready >= incede)
852	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));	2101	{
853	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));	2102	PUSHMARK (SP);
854	SvREFCNT_dec (sv);	2103	PUTBACK;
		2104	call_pv ("Coro::AnyEvent::_activity", G_DISCARD | G_EVAL);
		2105	SPAGAIN;
		2106	}
855		2107
856	transfer(aTHX_ prev, next, 0);	2108	--incede;
		2109	}
857		2110

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