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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.91 by root, Sat Nov 25 01:14:11 2006 UTC vs.
Revision 1.209 by root, Wed Oct 10 02:58:17 2007 UTC

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

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