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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.89 by root, Sat Nov 25 00:40:26 2006 UTC vs.
Revision 1.210 by root, Wed Oct 10 03:24:40 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
536	static void	637	static size_t
537	setup_coro (struct coro *coro)	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
		676	static void
		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	/* this newly created coroutine might be run on an existing cctx which most
		734	* likely was suspended in set_stacklevel, called from entersub.
		735	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		736	* so we ENTER here for symmetry
		737	*/
		738	ENTER;
		739	}
		740
		741	static void
		742	coro_destroy (pTHX_ struct coro *coro)
		743	{
		744	if (!IN_DESTRUCT)
		745	{
		746	/* restore all saved variables and stuff */
		747	LEAVE_SCOPE (0);
		748	assert (PL_tmps_floor == -1);
		749
		750	/* free all temporaries */
		751	FREETMPS;
		752	assert (PL_tmps_ix == -1);
		753
		754	/* unwind all extra stacks */
		755	POPSTACK_TO (PL_mainstack);
		756
		757	/* unwind main stack */
		758	dounwind (-1);
		759	}
		760
		761	SvREFCNT_dec (GvSV (PL_defgv));
		762	SvREFCNT_dec (GvAV (PL_defgv));
		763	SvREFCNT_dec (GvSV (PL_errgv));
		764	SvREFCNT_dec (PL_defoutgv);
		765	SvREFCNT_dec (PL_rs);
		766	SvREFCNT_dec (GvSV (irsgv));
		767
		768	SvREFCNT_dec (PL_diehook);
		769	SvREFCNT_dec (PL_warnhook);
		770
		771	SvREFCNT_dec (coro->saved_deffh);
		772	SvREFCNT_dec (coro->throw);
		773
		774	coro_destroy_stacks (aTHX);
		775	}
		776
		777	static void
		778	free_coro_mortal (pTHX)
		779	{
		780	if (expect_true (coro_mortal))
		781	{
		782	SvREFCNT_dec (coro_mortal);
		783	coro_mortal = 0;
		784	}
		785	}
		786
		787	static int
		788	runops_trace (pTHX)
		789	{
		790	COP *oldcop = 0;
		791	int oldcxix = -2;
		792	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		793	coro_cctx *cctx = coro->cctx;
		794
		795	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		796	{
		797	PERL_ASYNC_CHECK ();
		798
		799	if (cctx->flags & CC_TRACE_ALL)
		800	{
		801	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
		802	{
		803	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		804	SV **bot, **top;
		805	AV *av = newAV (); /* return values */
		806	SV **cb;
		807	dSP;
		808
		809	GV *gv = CvGV (cx->blk_sub.cv);
		810	SV *fullname = sv_2mortal (newSV (0));
		811	if (isGV (gv))
		812	gv_efullname3 (fullname, gv, 0);
		813
		814	bot = PL_stack_base + cx->blk_oldsp + 1;
		815	top = cx->blk_gimme == G_ARRAY ? SP + 1
		816	: cx->blk_gimme == G_SCALAR ? bot + 1
		817	: bot;
		818
		819	av_extend (av, top - bot);
		820	while (bot < top)
		821	av_push (av, SvREFCNT_inc (*bot++));
		822
		823	PL_runops = RUNOPS_DEFAULT;
		824	ENTER;
		825	SAVETMPS;
		826	EXTEND (SP, 3);
		827	PUSHMARK (SP);
		828	PUSHs (&PL_sv_no);
		829	PUSHs (fullname);
		830	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		831	PUTBACK;
		832	cb = hv_fetch ((HV *)SvRV (coro_current), strpair ("_trace_sub_cb"), 0);
		833	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		834	SPAGAIN;
		835	FREETMPS;
		836	LEAVE;
		837	PL_runops = runops_trace;
		838	}
		839
		840	if (oldcop != PL_curcop)
		841	{
		842	oldcop = PL_curcop;
		843
		844	if (PL_curcop != &PL_compiling)
		845	{
		846	SV **cb;
		847
		848	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
		849	{
		850	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		851
		852	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
		853	{
		854	runops_proc_t old_runops = PL_runops;
		855	dSP;
		856	GV *gv = CvGV (cx->blk_sub.cv);
		857	SV *fullname = sv_2mortal (newSV (0));
		858
		859	if (isGV (gv))
		860	gv_efullname3 (fullname, gv, 0);
		861
		862	PL_runops = RUNOPS_DEFAULT;
		863	ENTER;
		864	SAVETMPS;
		865	EXTEND (SP, 3);
		866	PUSHMARK (SP);
		867	PUSHs (&PL_sv_yes);
		868	PUSHs (fullname);
		869	PUSHs (cx->blk_sub.hasargs ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		870	PUTBACK;
		871	cb = hv_fetch ((HV *)SvRV (coro_current), strpair ("_trace_sub_cb"), 0);
		872	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		873	SPAGAIN;
		874	FREETMPS;
		875	LEAVE;
		876	PL_runops = runops_trace;
		877	}
		878
		879	oldcxix = cxstack_ix;
		880	}
		881
		882	if (cctx->flags & CC_TRACE_LINE)
		883	{
		884	dSP;
		885
		886	PL_runops = RUNOPS_DEFAULT;
		887	ENTER;
		888	SAVETMPS;
		889	EXTEND (SP, 3);
		890	PL_runops = RUNOPS_DEFAULT;
		891	PUSHMARK (SP);
		892	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		893	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		894	PUTBACK;
		895	cb = hv_fetch ((HV *)SvRV (coro_current), strpair ("_trace_line_cb"), 0);
		896	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		897	SPAGAIN;
		898	FREETMPS;
		899	LEAVE;
		900	PL_runops = runops_trace;
		901	}
		902	}
		903	}
		904	}
		905	}
		906
		907	TAINT_NOT;
		908	return 0;
		909	}
		910
		911	/* inject a fake call to Coro::State::_cctx_init into the execution */
		912	/* _cctx_init should be careful, as it could be called at almost any time */
		913	/* during execution of a perl program */
		914	static void NOINLINE
		915	cctx_prepare (pTHX_ coro_cctx *cctx)
		916	{
543	dSP;	917	dSP;
544	UNOP myop;	918	LOGOP myop;
545	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
546		919
547	coro_init_stacks (aTHX);	920	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		921
553	SPAGAIN;	922	if (cctx->flags & CC_TRACE)
		923	PL_runops = runops_trace;
554		924
555	Zero (&myop, 1, UNOP);	925	Zero (&myop, 1, LOGOP);
556	myop.op_next = Nullop;	926	myop.op_next = PL_op;
557	myop.op_flags = OPf_WANT_VOID;	927	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
558		928
		929	PUSHMARK (SP);
		930	EXTEND (SP, 2);
		931	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		932	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		933	PUTBACK;
559	PL_op = (OP *)&myop;	934	PL_op = (OP *)&myop;
560
561	PUSHMARK(SP);
562	XPUSHs (sub_init);
563	PUTBACK;
564	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	935	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
565	SPAGAIN;	936	SPAGAIN;
566
567	ENTER; /* necessary e.g. for dounwind */
568	}	937	}
569		938
		939	/*
		940	* this is a _very_ stripped down perl interpreter ;)
		941	*/
570	static void	942	static void
571	transfer_tail ()	943	cctx_run (void *arg)
572	{	944	{
573	if (coro_mortal)	945	dTHX;
574	{
575	SvREFCNT_dec (coro_mortal);
576	coro_mortal = 0;
577	}
578		946
		947	/* cctx_run is the alternative tail of transfer(), so unlock here. */
579	UNLOCK;	948	UNLOCK;
580	}
581		949
582	static void	950	/* we now skip the entersub that lead to transfer() */
583	coro_run (void *arg)	951	PL_op = PL_op->op_next;
584	{	952
		953	/* inject a fake subroutine call to cctx_init */
		954	cctx_prepare (aTHX_ (coro_cctx *)arg);
		955
		956	/* somebody or something will hit me for both perl_run and PL_restartop */
		957	PL_restartop = PL_op;
		958	perl_run (PL_curinterp);
		959
585	/*	960	/*
586	* this is a _very_ stripped down perl interpreter ;)	961	* If perl-run returns we assume exit() was being called or the coro
		962	* fell off the end, which seems to be the only valid (non-bug)
		963	* reason for perl_run to return. We try to exit by jumping to the
		964	* bootstrap-time "top" top_env, as we cannot restore the "main"
		965	* coroutine as Coro has no such concept
587	*/	966	*/
588	dTHX;
589
590	transfer_tail ();
591
592	PL_top_env = &PL_start_env;	967	PL_top_env = main_top_env;
593	PL_restartop = PL_op->op_next;	968	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
594	/* somebody will hit me for both perl_run and PL_restart_top */
595	perl_run (aTHX_ PERL_GET_CONTEXT);
596
597	abort ();
598	}	969	}
599		970
600	static coro_stack *	971	static coro_cctx *
601	stack_new ()	972	cctx_new ()
602	{	973	{
603	coro_stack *stack;	974	coro_cctx *cctx;
		975	void *stack_start;
		976	size_t stack_size;
604		977
		978	++cctx_count;
		979
605	New (0, stack, 1, coro_stack);	980	Newz (0, cctx, 1, coro_cctx);
606		981
607	#if HAVE_MMAP	982	#if HAVE_MMAP
608		983	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
609	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	984	/* mmap supposedly does allocate-on-write for us */
610	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	985	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
611		986
612	if (stack->sptr == (void *)-1)	987	if (cctx->sptr != (void *)-1)
		988	{
		989	# if CORO_STACKGUARD
		990	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		991	# endif
		992	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		993	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		994	cctx->flags |= CC_MAPPED;
613	{	995	}
		996	else
		997	#endif
		998	{
		999	cctx->ssize = coro_stacksize * (long)sizeof (long);
		1000	New (0, cctx->sptr, coro_stacksize, long);
		1001
		1002	if (!cctx->sptr)
		1003	{
614	fprintf (stderr, "FATAL: unable to mmap stack for coroutine\n");	1004	perror ("FATAL: unable to allocate stack for coroutine");
615	_exit (EXIT_FAILURE);	1005	_exit (EXIT_FAILURE);
		1006	}
		1007
		1008	stack_start = cctx->sptr;
		1009	stack_size = cctx->ssize;
		1010	}
		1011
		1012	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1013	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
		1014
		1015	return cctx;
		1016	}
		1017
		1018	static void
		1019	cctx_destroy (coro_cctx *cctx)
		1020	{
		1021	if (!cctx)
		1022	return;
		1023
		1024	--cctx_count;
		1025
		1026	#if CORO_USE_VALGRIND
		1027	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		1028	#endif
		1029
		1030	#if HAVE_MMAP
		1031	if (cctx->flags & CC_MAPPED)
		1032	munmap (cctx->sptr, cctx->ssize);
		1033	else
		1034	#endif
		1035	Safefree (cctx->sptr);
		1036
		1037	Safefree (cctx);
		1038	}
		1039
		1040	/* wether this cctx should be destructed */
		1041	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1042
		1043	static coro_cctx *
		1044	cctx_get (pTHX_ int gimme)
		1045	{
		1046	while (expect_true (cctx_first[gimme]))
616	}	1047	{
		1048	coro_cctx *cctx = cctx_first[gimme];
		1049	cctx_first[gimme] = cctx->next;
		1050	--cctx_idle[gimme];
617		1051
618	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	1052	if (expect_true (!CCTX_EXPIRED (cctx)))
		1053	return cctx;
619		1054
		1055	cctx_destroy (cctx);
		1056	}
		1057
		1058	assert (!gimme);
		1059	return cctx_new ();
		1060	}
		1061
		1062	static void
		1063	cctx_put (coro_cctx *cctx, int gimme)
		1064	{
		1065	/* free another cctx if overlimit */
		1066	if (expect_false (cctx_idle[gimme] >= MAX_IDLE_CCTX))
		1067	{
		1068	coro_cctx *first = cctx_first[gimme];
		1069	cctx_first[gimme] = first->next;
		1070	--cctx_idle[gimme];
		1071
		1072	cctx_destroy (first);
		1073	}
		1074
		1075	++cctx_idle[gimme];
		1076	cctx->next = cctx_first[gimme];
		1077	cctx_first[gimme] = cctx;
		1078	}
		1079
		1080	/** coroutine switching *****************************************************/
		1081
		1082	static void
		1083	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1084	{
		1085	if (expect_true (prev != next))
		1086	{
		1087	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1088	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1089
		1090	if (expect_false (next->flags & CF_RUNNING))
		1091	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1092
		1093	if (expect_false (next->flags & CF_DESTROYED))
		1094	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1095
		1096	if (
		1097	#if PERL_VERSION_ATLEAST (5,9,0)
		1098	expect_false (PL_parser)
620	#else	1099	#else
621		1100	expect_false (PL_lex_state != LEX_NOTPARSING)
622	stack->ssize = STACKSIZE * (long)sizeof (long);	1101	#endif
623	New (0, stack->sptr, STACKSIZE, long);	1102	)
624		1103	croak ("Coro::State::transfer called while parsing, but this is not supported");
625	if (!stack->sptr)
626	{	1104	}
627	fprintf (stderr, "FATAL: unable to malloc stack for coroutine\n");
628	_exit (EXIT_FAILURE);
629	}
630
631	#endif
632
633	coro_create (&stack->cctx, coro_run, 0, stack->sptr, stack->ssize);
634
635	return stack;
636	}	1105	}
637		1106
638	static void	1107	/* always use the TRANSFER macro */
639	stack_free (coro_stack *stack)	1108	static void NOINLINE
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 void
656	stack_get (struct coro *coro)
657	{
658	if (stack_first)
659	{
660	coro->stack = stack_first;
661	stack_first = stack_first->next;
662	}
663	else
664	coro->stack = stack_new ();
665	}
666
667	static void
668	stack_put (coro_stack *stack)
669	{
670	stack->next = stack_first;
671	stack_first = stack;
672	}
673
674	/* never call directly, always through the coro_state_transfer global variable */
675	static void
676	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	1109	transfer (pTHX_ struct coro *prev, struct coro *next)
677	{	1110	{
678	dSTACKLEVEL;	1111	dSTACKLEVEL;
679		1112
680	/* sometimes transfer is only called to set idle_sp */	1113	/* sometimes transfer is only called to set idle_sp */
681	if (!prev->stack->idle_sp)	1114	if (expect_false (!next))
682	prev->stack->idle_sp = stacklevel;	1115	{
683		1116	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
684	LOCK;	1117	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
685
686	if (prev != next)
687	{	1118	}
688	coro_stack *prev_stack = prev->stack;	1119	else if (expect_true (prev != next))
		1120	{
		1121	coro_cctx *prev__cctx;
689		1122
690	/* possibly "free" the stack */	1123	if (expect_false (prev->flags & CF_NEW))
691	if (prev_stack->idle_sp == stacklevel)
692	{	1124	{
693	stack_put (prev_stack);	1125	/* create a new empty context */
694	prev->stack = 0;	1126	Newz (0, prev->cctx, 1, coro_cctx);
		1127	prev->flags &= ~CF_NEW;
		1128	prev->flags |= CF_RUNNING;
695	}	1129	}
696		1130
697	if (!next->mainstack)	1131	prev->flags &= ~CF_RUNNING;
		1132	next->flags |= CF_RUNNING;
		1133
		1134	LOCK;
		1135
		1136	if (expect_false (next->flags & CF_NEW))
698	{	1137	{
		1138	/* need to start coroutine */
		1139	next->flags &= ~CF_NEW;
699	/* first get rid of the old state */	1140	/* first get rid of the old state */
700	SAVE (prev, -1);	1141	save_perl (aTHX_ prev);
701	/* setup coroutine call */	1142	/* setup coroutine call */
702	setup_coro (next);	1143	coro_setup (aTHX_ next);
703	next->stack = 0;
704	}	1144	}
705	else	1145	else
706	{	1146	{
707	SAVE (prev, flags);	1147	/* coroutine already started */
708	LOAD (next);	1148	save_perl (aTHX_ prev);
		1149	load_perl (aTHX_ next);
709	}	1150	}
710		1151
711	if (!next->stack)	1152	prev__cctx = prev->cctx;
712	stack_get (next);
713		1153
714	if (prev_stack != next->stack)	1154	/* possibly "free" the cctx */
		1155	if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
		1156	{
		1157	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1158	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1159
		1160	prev->cctx = 0;
		1161
		1162	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1163	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1164	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1165	if (!next->cctx)
		1166	next->cctx = cctx_get (aTHX_ next->gimme);
		1167
		1168	cctx_put (prev__cctx, prev->gimme);
		1169	}
		1170
		1171	++next->usecount;
		1172
		1173	if (expect_true (!next->cctx))
		1174	next->cctx = cctx_get (aTHX_ next->gimme);
		1175
		1176	if (expect_false (prev__cctx != next->cctx))
		1177	{
		1178	prev__cctx->top_env = PL_top_env;
		1179	PL_top_env = next->cctx->top_env;
715	coro_transfer (&prev_stack->cctx, &next->stack->cctx);	1180	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
716	}	1181	}
717		1182
718	transfer_tail ();	1183	free_coro_mortal (aTHX);
719	}	1184	UNLOCK;
720		1185
721	/* use this function pointer to call the above function */	1186	if (expect_false (prev->throw || next->throw))
722	/* this is done to increase chances of the compiler not inlining the call */	1187	{
723	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;	1188	struct coro *coro = SvSTATE (coro_current);
724		1189
		1190	if (coro->throw)
		1191	{
		1192	SV *exception = coro->throw;
		1193	coro->throw = 0;
		1194	sv_setsv (ERRSV, exception);
		1195	croak (0);
		1196	}
		1197	}
		1198	}
		1199	}
		1200
		1201	struct transfer_args
		1202	{
		1203	struct coro *prev, *next;
		1204	};
		1205
		1206	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1207	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1208
		1209	/** high level stuff ********************************************************/
		1210
725	static void	1211	static int
726	coro_state_destroy (struct coro *coro)	1212	coro_state_destroy (pTHX_ struct coro *coro)
727	{	1213	{
728	if (coro->refcnt--)	1214	if (coro->flags & CF_DESTROYED)
729	return;	1215	return 0;
		1216
		1217	coro->flags |= CF_DESTROYED;
		1218
		1219	if (coro->flags & CF_READY)
		1220	{
		1221	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1222	/* alternative: look through all ready queues and remove the coro */
		1223	LOCK;
		1224	--coro_nready;
		1225	UNLOCK;
		1226	}
		1227	else
		1228	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
730		1229
731	if (coro->mainstack && coro->mainstack != main_mainstack)	1230	if (coro->mainstack && coro->mainstack != main_mainstack)
732	{	1231	{
733	struct coro temp;	1232	struct coro temp;
734		1233
735	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1234	if (coro->flags & CF_RUNNING)
		1235	croak ("FATAL: tried to destroy currently running coroutine");
		1236
		1237	save_perl (aTHX_ &temp);
736	LOAD (aTHX_ coro);	1238	load_perl (aTHX_ coro);
737		1239
738	destroy_stacks (aTHX);	1240	coro_destroy (aTHX_ coro);
739		1241
740	LOAD ((&temp)); /* this will get rid of defsv etc.. */	1242	load_perl (aTHX_ &temp);
741		1243
742	coro->mainstack = 0;	1244	coro->slot = 0;
743	}	1245	}
744		1246
745	stack_free (coro->stack);	1247	cctx_destroy (coro->cctx);
746	SvREFCNT_dec (coro->args);	1248	SvREFCNT_dec (coro->args);
747	Safefree (coro);	1249
		1250	if (coro->next) coro->next->prev = coro->prev;
		1251	if (coro->prev) coro->prev->next = coro->next;
		1252	if (coro == coro_first) coro_first = coro->next;
		1253
		1254	return 1;
748	}	1255	}
749		1256
750	static int	1257	static int
751	coro_state_clear (SV *sv, MAGIC *mg)	1258	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
752	{	1259	{
753	struct coro *coro = (struct coro *)mg->mg_ptr;	1260	struct coro *coro = (struct coro *)mg->mg_ptr;
754	mg->mg_ptr = 0;	1261	mg->mg_ptr = 0;
755		1262
		1263	coro->hv = 0;
		1264
		1265	if (--coro->refcnt < 0)
		1266	{
756	coro_state_destroy (coro);	1267	coro_state_destroy (aTHX_ coro);
		1268	Safefree (coro);
		1269	}
757		1270
758	return 0;	1271	return 0;
759	}	1272	}
760		1273
761	static int	1274	static int
762	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)	1275	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
763	{	1276	{
764	struct coro *coro = (struct coro *)mg->mg_ptr;	1277	struct coro *coro = (struct coro *)mg->mg_ptr;
765		1278
766	++coro->refcnt;	1279	++coro->refcnt;
767		1280
768	return 0;	1281	return 0;
769	}	1282	}
770		1283
771	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	1284	static MGVTBL coro_state_vtbl = {
		1285	0, 0, 0, 0,
		1286	coro_state_free,
		1287	0,
		1288	#ifdef MGf_DUP
		1289	coro_state_dup,
		1290	#else
		1291	# define MGf_DUP 0
		1292	#endif
		1293	};
772		1294
773	static struct coro *
774	SvSTATE (SV *coro)
775	{
776	HV *stash;
777	MAGIC *mg;
778
779	if (SvROK (coro))
780	coro = SvRV (coro);
781
782	stash = SvSTASH (coro);
783	if (stash != coro_stash && stash != coro_state_stash)
784	{
785	/* very slow, but rare, check */
786	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
787	croak ("Coro::State object required");
788	}
789
790	mg = SvMAGIC (coro);
791	assert (mg->mg_type == PERL_MAGIC_ext);
792	return (struct coro *)mg->mg_ptr;
793	}
794
795	static void	1295	static void
		1296	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1297	{
		1298	ta->prev = SvSTATE (prev_sv);
		1299	ta->next = SvSTATE (next_sv);
		1300	TRANSFER_CHECK (*ta);
		1301	}
		1302
		1303	static void
796	api_transfer (pTHX_ SV *prev, SV *next, int flags)	1304	api_transfer (SV *prev_sv, SV *next_sv)
797	{	1305	{
798	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1306	dTHX;
		1307	struct transfer_args ta;
		1308
		1309	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1310	TRANSFER (ta);
799	}	1311	}
800		1312
801	/** Coro ********************************************************************/	1313	/** Coro ********************************************************************/
802		1314
803	#define PRIO_MAX 3
804	#define PRIO_HIGH 1
805	#define PRIO_NORMAL 0
806	#define PRIO_LOW -1
807	#define PRIO_IDLE -3
808	#define PRIO_MIN -4
809
810	/* for Coro.pm */
811	static GV *coro_current, *coro_idle;
812	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
813	static int coro_nready;
814
815	static void	1315	static void
816	coro_enq (pTHX_ SV *sv)	1316	coro_enq (pTHX_ SV *coro_sv)
817	{	1317	{
818	int prio;
819
820	if (SvTYPE (sv) != SVt_PVHV)
821	croak ("Coro::ready tried to enqueue something that is not a coroutine");
822
823	prio = SvSTATE (sv)->prio;
824
825	av_push (coro_ready [prio - PRIO_MIN], sv);	1318	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
826	coro_nready++;
827	}	1319	}
828		1320
829	static SV *	1321	static SV *
830	coro_deq (pTHX_ int min_prio)	1322	coro_deq (pTHX_ int min_prio)
831	{	1323	{
…		…
835	if (min_prio < 0)	1327	if (min_prio < 0)
836	min_prio = 0;	1328	min_prio = 0;
837		1329
838	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1330	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
839	if (AvFILLp (coro_ready [prio]) >= 0)	1331	if (AvFILLp (coro_ready [prio]) >= 0)
840	{
841	coro_nready--;
842	return av_shift (coro_ready [prio]);	1332	return av_shift (coro_ready [prio]);
843	}
844		1333
845	return 0;	1334	return 0;
846	}	1335	}
847		1336
848	static void	1337	static int
849	api_ready (SV *coro)	1338	api_ready (SV *coro_sv)
850	{	1339	{
851	dTHX;	1340	dTHX;
		1341	struct coro *coro;
852		1342
853	if (SvROK (coro))	1343	if (SvROK (coro_sv))
854	coro = SvRV (coro);	1344	coro_sv = SvRV (coro_sv);
		1345
		1346	coro = SvSTATE (coro_sv);
		1347
		1348	if (coro->flags & CF_READY)
		1349	return 0;
		1350
		1351	coro->flags |= CF_READY;
855		1352
856	LOCK;	1353	LOCK;
857	coro_enq (aTHX_ SvREFCNT_inc (coro));	1354	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1355	++coro_nready;
858	UNLOCK;	1356	UNLOCK;
		1357
		1358	return 1;
		1359	}
		1360
		1361	static int
		1362	api_is_ready (SV *coro_sv)
		1363	{
		1364	dTHX;
		1365	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1366	}
		1367
		1368	static void
		1369	prepare_schedule (pTHX_ struct transfer_args *ta)
		1370	{
		1371	SV *prev_sv, *next_sv;
		1372
		1373	for (;;)
		1374	{
		1375	LOCK;
		1376	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1377
		1378	/* nothing to schedule: call the idle handler */
		1379	if (expect_false (!next_sv))
		1380	{
		1381	dSP;
		1382	UNLOCK;
		1383
		1384	ENTER;
		1385	SAVETMPS;
		1386
		1387	PUSHMARK (SP);
		1388	PUTBACK;
		1389	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1390
		1391	FREETMPS;
		1392	LEAVE;
		1393	continue;
		1394	}
		1395
		1396	ta->next = SvSTATE (next_sv);
		1397
		1398	/* cannot transfer to destroyed coros, skip and look for next */
		1399	if (expect_false (ta->next->flags & CF_DESTROYED))
		1400	{
		1401	UNLOCK;
		1402	SvREFCNT_dec (next_sv);
		1403	/* coro_nready is already taken care of by destroy */
		1404	continue;
		1405	}
		1406
		1407	--coro_nready;
		1408	UNLOCK;
		1409	break;
		1410	}
		1411
		1412	/* free this only after the transfer */
		1413	prev_sv = SvRV (coro_current);
		1414	ta->prev = SvSTATE (prev_sv);
		1415	TRANSFER_CHECK (*ta);
		1416	assert (ta->next->flags & CF_READY);
		1417	ta->next->flags &= ~CF_READY;
		1418	SvRV_set (coro_current, next_sv);
		1419
		1420	LOCK;
		1421	free_coro_mortal (aTHX);
		1422	coro_mortal = prev_sv;
		1423	UNLOCK;
		1424	}
		1425
		1426	static void
		1427	prepare_cede (pTHX_ struct transfer_args *ta)
		1428	{
		1429	api_ready (coro_current);
		1430	prepare_schedule (aTHX_ ta);
		1431	}
		1432
		1433	static int
		1434	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1435	{
		1436	if (coro_nready)
		1437	{
		1438	SV *prev = SvRV (coro_current);
		1439	prepare_schedule (aTHX_ ta);
		1440	api_ready (prev);
		1441	return 1;
		1442	}
		1443	else
		1444	return 0;
859	}	1445	}
860		1446
861	static void	1447	static void
862	api_schedule (void)	1448	api_schedule (void)
863	{	1449	{
864	dTHX;	1450	dTHX;
		1451	struct transfer_args ta;
865		1452
866	SV *prev, *next;	1453	prepare_schedule (aTHX_ &ta);
867	SV *current = GvSV (coro_current);	1454	TRANSFER (ta);
868
869	for (;;)
870	{
871	LOCK;
872
873	next = coro_deq (aTHX_ PRIO_MIN);
874
875	if (next)
876	break;
877
878	UNLOCK;
879
880	{
881	dSP;
882
883	ENTER;
884	SAVETMPS;
885
886	PUSHMARK (SP);
887	PUTBACK;
888	call_sv (GvSV (coro_idle), G_DISCARD);
889
890	FREETMPS;
891	LEAVE;
892	}
893	}
894
895	prev = SvRV (current);
896	SvRV (current) = next;
897
898	/* free this only after the transfer */
899	coro_mortal = prev;
900
901	UNLOCK;
902
903	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), TRANSFER_SAVE_ALL);
904	}	1455	}
905		1456
906	static int coro_cede_self;
907
908	static void	1457	static int
909	api_cede (void)	1458	api_cede (void)
910	{	1459	{
911	dTHX;	1460	dTHX;
912	SV *current = SvREFCNT_inc (SvRV (GvSV (coro_current)));	1461	struct transfer_args ta;
913		1462
914	LOCK;	1463	prepare_cede (aTHX_ &ta);
915		1464
916	if (coro_cede_self)	1465	if (expect_true (ta.prev != ta.next))
917	{	1466	{
918	AV *runqueue = coro_ready [PRIO_MAX - PRIO_MIN];	1467	TRANSFER (ta);
919	av_unshift (runqueue, 1);	1468	return 1;
920	av_store (runqueue, 0, current);
921	coro_nready++;
922	coro_cede_self = 0;
923	}	1469	}
924	else	1470	else
925	coro_enq (aTHX_ current);	1471	return 0;
926
927	UNLOCK;
928
929	api_schedule ();
930	}	1472	}
931		1473
		1474	static int
		1475	api_cede_notself (void)
		1476	{
		1477	dTHX;
		1478	struct transfer_args ta;
		1479
		1480	if (prepare_cede_notself (aTHX_ &ta))
		1481	{
		1482	TRANSFER (ta);
		1483	return 1;
		1484	}
		1485	else
		1486	return 0;
		1487	}
		1488
		1489	static void
		1490	api_trace (SV *coro_sv, int flags)
		1491	{
		1492	dTHX;
		1493	struct coro *coro = SvSTATE (coro_sv);
		1494
		1495	if (flags & CC_TRACE)
		1496	{
		1497	if (!coro->cctx)
		1498	coro->cctx = cctx_new ();
		1499	else if (!(coro->cctx->flags & CC_TRACE))
		1500	croak ("cannot enable tracing on coroutine with custom stack");
		1501
		1502	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1503	}
		1504	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1505	{
		1506	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1507
		1508	if (coro->flags & CF_RUNNING)
		1509	PL_runops = RUNOPS_DEFAULT;
		1510	else
		1511	coro->slot->runops = RUNOPS_DEFAULT;
		1512	}
		1513	}
		1514
932	MODULE = Coro::State PACKAGE = Coro::State	1515	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
933		1516
934	PROTOTYPES: DISABLE	1517	PROTOTYPES: DISABLE
935		1518
936	BOOT:	1519	BOOT:
937	{	1520	{
938	#ifdef USE_ITHREADS	1521	#ifdef USE_ITHREADS
939	MUTEX_INIT (&coro_mutex);	1522	MUTEX_INIT (&coro_mutex);
940	#endif	1523	#endif
941	BOOT_PAGESIZE;	1524	BOOT_PAGESIZE;
942		1525
		1526	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1527	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1528
		1529	hv_sig = coro_get_hv ("SIG", TRUE);
		1530	sv_diehook = coro_get_sv ("Coro::State::DIEHOOK" , TRUE);
		1531	sv_warnhook = coro_get_sv ("Coro::State::WARNHOOK", TRUE);
		1532
		1533	if (!PL_diehook ) hv_store (hv_sig, strpair ("__DIE__" ), SvREFCNT_inc (sv_diehook ), 0);
		1534	if (!PL_warnhook) hv_store (hv_sig, strpair ("__WARN__"), SvREFCNT_inc (sv_warnhook), 0);
		1535
943	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1536	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
944		1537
945	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1538	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
946	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1539	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
947	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1540	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
		1541	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
948		1542
949	main_mainstack = PL_mainstack;	1543	main_mainstack = PL_mainstack;
		1544	main_top_env = PL_top_env;
		1545
		1546	while (main_top_env->je_prev)
		1547	main_top_env = main_top_env->je_prev;
950		1548
951	coroapi.ver = CORO_API_VERSION;	1549	coroapi.ver = CORO_API_VERSION;
		1550	coroapi.rev = CORO_API_REVISION;
952	coroapi.transfer = api_transfer;	1551	coroapi.transfer = api_transfer;
953
954	Newz (0, main_stack, 1, coro_stack);
955	main_stack->idle_sp = (void *)-1;
956		1552
957	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1553	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
958	}	1554	}
959		1555
960	SV *	1556	SV *
…		…
964	struct coro *coro;	1560	struct coro *coro;
965	HV *hv;	1561	HV *hv;
966	int i;	1562	int i;
967		1563
968	Newz (0, coro, 1, struct coro);	1564	Newz (0, coro, 1, struct coro);
969	coro->args = newAV ();	1565	coro->args = newAV ();
		1566	coro->flags = CF_NEW;
970		1567
		1568	if (coro_first) coro_first->prev = coro;
		1569	coro->next = coro_first;
		1570	coro_first = coro;
		1571
971	hv = newHV ();	1572	coro->hv = hv = newHV ();
972	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1573	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
973	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1574	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
974		1575
975	av_push (coro->args, newSVsv (RETVAL));	1576	av_extend (coro->args, items - 1);
976	for (i = 1; i < items; i++)	1577	for (i = 1; i < items; i++)
977	av_push (coro->args, newSVsv (ST (i)));	1578	av_push (coro->args, newSVsv (ST (i)));
978
979	coro->stack = main_stack;
980	/*coro->mainstack = 0; *//*actual work is done inside transfer */
981	/*coro->stack = 0;*/
982	}	1579	}
983	OUTPUT:	1580	OUTPUT:
984	RETVAL	1581	RETVAL
985		1582
		1583	# these not obviously related functions are all rolled into the same xs
		1584	# function to increase chances that they all will call transfer with the same
		1585	# stack offset
986	void	1586	void
987	transfer (prev, next, flags)	1587	_set_stacklevel (...)
988	SV *prev	1588	ALIAS:
989	SV *next	1589	Coro::State::transfer = 1
990	int flags	1590	Coro::schedule = 2
		1591	Coro::cede = 3
		1592	Coro::cede_notself = 4
991	CODE:	1593	CODE:
		1594	{
		1595	struct transfer_args ta;
		1596
		1597	switch (ix)
		1598	{
		1599	case 0:
		1600	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1601	ta.next = 0;
		1602	break;
		1603
		1604	case 1:
		1605	if (items != 2)
		1606	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1607
		1608	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1609	break;
		1610
		1611	case 2:
		1612	prepare_schedule (aTHX_ &ta);
		1613	break;
		1614
		1615	case 3:
		1616	prepare_cede (aTHX_ &ta);
		1617	break;
		1618
		1619	case 4:
		1620	if (!prepare_cede_notself (aTHX_ &ta))
		1621	XSRETURN_EMPTY;
		1622
		1623	break;
		1624	}
		1625
		1626	BARRIER;
992	PUTBACK;	1627	PUTBACK;
993	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1628	TRANSFER (ta);
994	SPAGAIN;	1629	SPAGAIN; /* might be the sp of a different coroutine now */
995		1630	/* be extra careful not to ever do anything after TRANSFER */
996	int
997	prio (Coro::State coro, int newprio = 0)
998	ALIAS:
999	nice = 1
1000	CODE:
1001	{
1002	RETVAL = coro->prio;
1003
1004	if (items > 1)
1005	{
1006	if (ix)
1007	newprio += coro->prio;
1008
1009	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1010	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1011
1012	coro->prio = newprio;
1013	}
1014	}	1631	}
1015		1632
1016	void	1633	bool
1017	_clear_idle_sp (Coro::State self)	1634	_destroy (SV *coro_sv)
1018	CODE:	1635	CODE:
1019	self->stack->idle_sp = 0;	1636	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
1020		1637	OUTPUT:
1021	void	1638	RETVAL
1022	_clone_state_from (SV *dst, SV *src)
1023	CODE:
1024	{
1025	struct coro *coro_src = SvSTATE (src);
1026
1027	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1028
1029	++coro_src->refcnt;
1030	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1031	}
1032		1639
1033	void	1640	void
1034	_exit (code)	1641	_exit (code)
1035	int code	1642	int code
1036	PROTOTYPE: $	1643	PROTOTYPE: $
1037	CODE:	1644	CODE:
1038	_exit (code);	1645	_exit (code);
1039		1646
1040	MODULE = Coro::State PACKAGE = Coro::Cont	1647	int
		1648	cctx_stacksize (int new_stacksize = 0)
		1649	CODE:
		1650	RETVAL = coro_stacksize;
		1651	if (new_stacksize)
		1652	coro_stacksize = new_stacksize;
		1653	OUTPUT:
		1654	RETVAL
		1655
		1656	int
		1657	cctx_count ()
		1658	CODE:
		1659	RETVAL = cctx_count;
		1660	OUTPUT:
		1661	RETVAL
		1662
		1663	int
		1664	cctx_idle ()
		1665	CODE:
		1666	RETVAL = cctx_idle[0] + cctx_idle[1] + cctx_idle[2];
		1667	OUTPUT:
		1668	RETVAL
1041		1669
1042	void	1670	void
1043	yield (...)	1671	list ()
1044	PROTOTYPE: @	1672	PPCODE:
		1673	{
		1674	struct coro *coro;
		1675	for (coro = coro_first; coro; coro = coro->next)
		1676	if (coro->hv)
		1677	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1678	}
		1679
		1680	void
		1681	call (Coro::State coro, SV *coderef)
		1682	ALIAS:
		1683	eval = 1
		1684	CODE:
		1685	{
		1686	if (coro->mainstack)
		1687	{
		1688	struct coro temp;
		1689
		1690	if (!(coro->flags & CF_RUNNING))
		1691	{
		1692	save_perl (aTHX_ &temp);
		1693	load_perl (aTHX_ coro);
		1694	}
		1695
		1696	{
		1697	dSP;
		1698	ENTER;
		1699	SAVETMPS;
		1700	PUTBACK;
		1701	PUSHSTACK;
		1702	PUSHMARK (SP);
		1703
		1704	if (ix)
		1705	eval_sv (coderef, 0);
		1706	else
		1707	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1708
		1709	POPSTACK;
		1710	FREETMPS;
		1711	LEAVE;
		1712	PUTBACK;
		1713	}
		1714
		1715	if (!(coro->flags & CF_RUNNING))
		1716	{
		1717	save_perl (aTHX_ coro);
		1718	load_perl (aTHX_ &temp);
		1719	}
		1720	}
		1721	}
		1722
		1723	SV *
		1724	is_ready (Coro::State coro)
		1725	PROTOTYPE: $
		1726	ALIAS:
		1727	is_ready = CF_READY
		1728	is_running = CF_RUNNING
		1729	is_new = CF_NEW
		1730	is_destroyed = CF_DESTROYED
		1731	CODE:
		1732	RETVAL = boolSV (coro->flags & ix);
		1733	OUTPUT:
		1734	RETVAL
		1735
		1736	void
		1737	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1738
		1739	SV *
		1740	has_stack (Coro::State coro)
		1741	PROTOTYPE: $
		1742	CODE:
		1743	RETVAL = boolSV (!!coro->cctx);
		1744	OUTPUT:
		1745	RETVAL
		1746
		1747	int
		1748	is_traced (Coro::State coro)
		1749	PROTOTYPE: $
		1750	CODE:
		1751	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1752	OUTPUT:
		1753	RETVAL
		1754
		1755	IV
		1756	rss (Coro::State coro)
		1757	PROTOTYPE: $
		1758	ALIAS:
		1759	usecount = 1
1045	CODE:	1760	CODE:
1046	{	1761	switch (ix)
1047	SV *yieldstack;	1762	{
1048	SV *sv;	1763	case 0: RETVAL = coro_rss (aTHX_ coro); break;
1049	AV *defav = GvAV (PL_defgv);	1764	case 1: RETVAL = coro->usecount; break;
1050	struct coro *prev, *next;
1051
1052	yieldstack = *hv_fetch (
1053	(HV *)SvRV (GvSV (coro_current)),
1054	"yieldstack", sizeof ("yieldstack") - 1,
1055	0	1765	}
1056	);	1766	OUTPUT:
		1767	RETVAL
1057		1768
1058	/* set up @_ -- ugly */
1059	av_clear (defav);
1060	av_fill (defav, items - 1);
1061	while (items--)
1062	av_store (defav, items, SvREFCNT_inc (ST(items)));
1063
1064	sv = av_pop ((AV *)SvRV (yieldstack));
1065	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1066	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1067	SvREFCNT_dec (sv);
1068
1069	coro_state_transfer (aTHX_ prev, next, 0);
1070	}
1071		1769
1072	MODULE = Coro::State PACKAGE = Coro	1770	MODULE = Coro::State PACKAGE = Coro
1073		1771
1074	BOOT:	1772	BOOT:
1075	{	1773	{
1076	int i;	1774	int i;
1077		1775
		1776	sv_pool_rss = coro_get_sv ("Coro::POOL_RSS" , TRUE);
		1777	sv_pool_size = coro_get_sv ("Coro::POOL_SIZE" , TRUE);
		1778	av_async_pool = coro_get_av ("Coro::async_pool", TRUE);
		1779
		1780	coro_current = coro_get_sv ("Coro::current", FALSE);
		1781	SvREADONLY_on (coro_current);
		1782
1078	coro_stash = gv_stashpv ("Coro", TRUE);	1783	coro_stash = gv_stashpv ("Coro", TRUE);
1079		1784
1080	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));	1785	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1081	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1786	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1082	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1787	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1083	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1788	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1084	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1789	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1085	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1790	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1086		1791
1087	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1088	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1089
1090	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1792	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1091	coro_ready[i] = newAV ();	1793	coro_ready[i] = newAV ();
1092		1794
1093	{	1795	{
1094	SV *sv = perl_get_sv("Coro::API", 1);	1796	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1797	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
1095		1798
1096	coroapi.schedule = api_schedule;	1799	coroapi.schedule = api_schedule;
1097	coroapi.cede = api_cede;	1800	coroapi.cede = api_cede;
		1801	coroapi.cede_notself = api_cede_notself;
1098	coroapi.ready = api_ready;	1802	coroapi.ready = api_ready;
		1803	coroapi.is_ready = api_is_ready;
1099	coroapi.nready = &coro_nready;	1804	coroapi.nready = &coro_nready;
1100	coroapi.current = coro_current;	1805	coroapi.current = coro_current;
1101		1806
1102	GCoroAPI = &coroapi;	1807	GCoroAPI = &coroapi;
1103	sv_setiv (sv, (IV)&coroapi);	1808	sv_setiv (sv, (IV)&coroapi);
1104	SvREADONLY_on (sv);	1809	SvREADONLY_on (sv);
1105	}	1810	}
1106	}	1811	}
1107		1812
1108	void	1813	void
		1814	_set_current (SV *current)
		1815	PROTOTYPE: $
		1816	CODE:
		1817	SvREFCNT_dec (SvRV (coro_current));
		1818	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1819
		1820	int
		1821	prio (Coro::State coro, int newprio = 0)
		1822	ALIAS:
		1823	nice = 1
		1824	CODE:
		1825	{
		1826	RETVAL = coro->prio;
		1827
		1828	if (items > 1)
		1829	{
		1830	if (ix)
		1831	newprio = coro->prio - newprio;
		1832
		1833	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1834	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1835
		1836	coro->prio = newprio;
		1837	}
		1838	}
		1839	OUTPUT:
		1840	RETVAL
		1841
		1842	SV *
1109	ready (SV *self)	1843	ready (SV *self)
1110	PROTOTYPE: $	1844	PROTOTYPE: $
1111	CODE:	1845	CODE:
1112	api_ready (self);	1846	RETVAL = boolSV (api_ready (self));
		1847	OUTPUT:
		1848	RETVAL
1113		1849
1114	int	1850	int
1115	nready (...)	1851	nready (...)
1116	PROTOTYPE:	1852	PROTOTYPE:
1117	CODE:	1853	CODE:
1118	RETVAL = coro_nready;	1854	RETVAL = coro_nready;
1119	OUTPUT:	1855	OUTPUT:
1120	RETVAL	1856	RETVAL
1121		1857
1122	void	1858	void
1123	schedule (...)	1859	throw (Coro::State self, SV *throw = &PL_sv_undef)
1124	PROTOTYPE:	1860	PROTOTYPE: $;$
		1861	CODE:
		1862	SvREFCNT_dec (self->throw);
		1863	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1864
		1865	# for async_pool speedup
		1866	void
		1867	_pool_1 (SV *cb)
1125	CODE:	1868	CODE:
1126	api_schedule ();	1869	{
		1870	struct coro *coro = SvSTATE (coro_current);
		1871	HV *hv = (HV *)SvRV (coro_current);
		1872	AV *defav = GvAV (PL_defgv);
		1873	SV *invoke = hv_delete (hv, strpair ("_invoke"), 0);
		1874	AV *invoke_av;
		1875	int i, len;
		1876
		1877	if (!invoke)
		1878	croak ("\3async_pool terminate\2\n");
		1879
		1880	SvREFCNT_dec (coro->saved_deffh);
		1881	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1882
		1883	hv_store (hv, "desc", sizeof ("desc") - 1,
		1884	newSVpvn (strpair ("[async_pool]")), 0);
		1885
		1886	invoke_av = (AV *)SvRV (invoke);
		1887	len = av_len (invoke_av);
		1888
		1889	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1890
		1891	if (len > 0)
		1892	{
		1893	av_fill (defav, len - 1);
		1894	for (i = 0; i < len; ++i)
		1895	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1896	}
		1897
		1898	SvREFCNT_dec (invoke);
		1899	}
1127		1900
1128	void	1901	void
1129	_set_cede_self ()	1902	_pool_2 (SV *cb)
1130	CODE:	1903	CODE:
1131	coro_cede_self = 1;	1904	{
		1905	struct coro *coro = SvSTATE (coro_current);
1132		1906
1133	void	1907	sv_setsv (cb, &PL_sv_undef);
1134	cede (...)	1908
1135	PROTOTYPE:	1909	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
1136	CODE:	1910	coro->saved_deffh = 0;
1137	api_cede ();	1911
		1912	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1913	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1914	croak ("\3async_pool terminate\2\n");
		1915
		1916	av_clear (GvAV (PL_defgv));
		1917	hv_store ((HV *)SvRV (coro_current), strpair ("desc"),
		1918	newSVpvn (strpair ("[async_pool idle]")), 0);
		1919
		1920	coro->prio = 0;
		1921
		1922	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1923	api_trace (coro_current, 0);
		1924
		1925	av_push (av_async_pool, newSVsv (coro_current));
		1926	}
		1927
1138		1928
1139	MODULE = Coro::State PACKAGE = Coro::AIO	1929	MODULE = Coro::State PACKAGE = Coro::AIO
1140		1930
1141	SV *	1931	SV *
1142	_get_state ()	1932	_get_state ()
1143	CODE:	1933	CODE:
1144	{	1934	{
1145	struct {	1935	struct io_state *data;
1146	int errorno;
1147	int laststype;
1148	int laststatval;
1149	Stat_t statcache;
1150	} data;
1151		1936
		1937	RETVAL = newSV (sizeof (struct io_state));
		1938	data = (struct io_state *)SvPVX (RETVAL);
		1939	SvCUR_set (RETVAL, sizeof (struct io_state));
		1940	SvPOK_only (RETVAL);
		1941
1152	data.errorno = errno;	1942	data->errorno = errno;
1153	data.laststype = PL_laststype;	1943	data->laststype = PL_laststype;
1154	data.laststatval = PL_laststatval;	1944	data->laststatval = PL_laststatval;
1155	data.statcache = PL_statcache;	1945	data->statcache = PL_statcache;
1156
1157	RETVAL = newSVpvn ((char *)&data, sizeof data);
1158	}	1946	}
1159	OUTPUT:	1947	OUTPUT:
1160	RETVAL	1948	RETVAL
1161		1949
1162	void	1950	void
1163	_set_state (char *data_)	1951	_set_state (char *data_)
1164	PROTOTYPE: $	1952	PROTOTYPE: $
1165	CODE:	1953	CODE:
1166	{	1954	{
1167	struct {	1955	struct io_state *data = (void *)data_;
1168	int errorno;
1169	int laststype;
1170	int laststatval;
1171	Stat_t statcache;
1172	} *data = (void *)data_;
1173		1956
1174	errno = data->errorno;	1957	errno = data->errorno;
1175	PL_laststype = data->laststype;	1958	PL_laststype = data->laststype;
1176	PL_laststatval = data->laststatval;	1959	PL_laststatval = data->laststatval;
1177	PL_statcache = data->statcache;	1960	PL_statcache = data->statcache;
1178	}	1961	}
		1962

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