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Comparing Coro/Coro/State.xs (file contents):
Revision 1.20 by root, Fri Aug 3 12:51:56 2001 UTC vs.
Revision 1.244 by root, Sun Sep 21 18:29:39 2008 UTC

		1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4	#define PERL_EXT
		5
1	#include "EXTERN.h"	6	#include "EXTERN.h"
2	#include "perl.h"	7	#include "perl.h"
3	#include "XSUB.h"	8	#include "XSUB.h"
4		9
5	#include "libcoro/coro.c"	10	#include "patchlevel.h"
6		11
7	#include <signal.h>	12	#include <stdio.h>
		13	#include <errno.h>
		14	#include <assert.h>
		15
		16	#ifdef WIN32
		17	# undef setjmp
		18	# undef longjmp
		19	# undef _exit
		20	# define setjmp _setjmp // deep magic, don't ask
		21	#else
		22	# include <inttypes.h> /* most portable stdint.h */
		23	#endif
8		24
9	#ifdef HAVE_MMAP	25	#ifdef HAVE_MMAP
10	# include <unistd.h>	26	# include <unistd.h>
11	# include <sys/mman.h>	27	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	28	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	29	# ifdef MAP_ANON
		30	# define MAP_ANONYMOUS MAP_ANON
15	# else	31	# else
16	# undef HAVE_MMAP	32	# undef HAVE_MMAP
17	# endif	33	# endif
18	# endif	34	# endif
		35	# include <limits.h>
		36	# ifndef PAGESIZE
		37	# define PAGESIZE pagesize
		38	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		39	static long pagesize;
		40	# else
		41	# define BOOT_PAGESIZE (void)0
19	#endif	42	# endif
20
21	#define MAY_FLUSH /* increases codesize */
22
23	/* perl-related */
24	#define TRANSFER_SAVE_DEFAV 0x00000001
25	#define TRANSFER_SAVE_DEFSV 0x00000002
26	#define TRANSFER_SAVE_ERRSV 0x00000004
27	/* c-related */
28	#define TRANSFER_SAVE_CCTXT 0x00000008
29	#ifdef CORO_LAZY_STACK
30	# define TRANSFER_LAZY_STACK 0x00000010
31	#else	43	#else
32	# define TRANSFER_LAZY_STACK 0x00000000	44	# define PAGESIZE 0
		45	# define BOOT_PAGESIZE (void)0
		46	#endif
		47
		48	#if CORO_USE_VALGRIND
		49	# include <valgrind/valgrind.h>
		50	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		51	#else
		52	# define REGISTER_STACK(cctx,start,end)
		53	#endif
		54
		55	/* the maximum number of idle cctx that will be pooled */
		56	#define MAX_IDLE_CCTX 8
		57
		58	#define PERL_VERSION_ATLEAST(a,b,c) \
		59	(PERL_REVISION > (a) \
		60	|| (PERL_REVISION == (a) \
		61	&& (PERL_VERSION > (b) \
		62	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		63
		64	#if !PERL_VERSION_ATLEAST (5,6,0)
		65	# ifndef PL_ppaddr
		66	# define PL_ppaddr ppaddr
33	#endif	67	# endif
		68	# ifndef call_sv
		69	# define call_sv perl_call_sv
		70	# endif
		71	# ifndef get_sv
		72	# define get_sv perl_get_sv
		73	# endif
		74	# ifndef get_cv
		75	# define get_cv perl_get_cv
		76	# endif
		77	# ifndef IS_PADGV
		78	# define IS_PADGV(v) 0
		79	# endif
		80	# ifndef IS_PADCONST
		81	# define IS_PADCONST(v) 0
		82	# endif
		83	#endif
34		84
35	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	85	/* 5.8.8 */
36	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	86	#ifndef GV_NOTQUAL
		87	# define GV_NOTQUAL 0
		88	#endif
		89	#ifndef newSV
		90	# define newSV(l) NEWSV(0,l)
		91	#endif
37		92
38	#define SUB_INIT "Coro::State::initialize"	93	/* 5.11 */
39	#define UCORO_STATE "_coro_state"	94	#ifndef CxHASARGS
		95	# define CxHASARGS(cx) (cx)->blk_sub.hasargs
		96	#endif
40		97
41	/* The next macro should delcare a variable stacklevel that contains and approximation	98	/* 5.8.7 */
42	* to the current C stack pointer. It's property is that it changes with each call	99	#ifndef SvRV_set
43	* and should be unique. */	100	# define SvRV_set(s,v) SvRV(s) = (v)
		101	#endif
		102
		103	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		104	# undef CORO_STACKGUARD
		105	#endif
		106
		107	#ifndef CORO_STACKGUARD
		108	# define CORO_STACKGUARD 0
		109	#endif
		110
		111	/* prefer perl internal functions over our own? */
		112	#ifndef CORO_PREFER_PERL_FUNCTIONS
		113	# define CORO_PREFER_PERL_FUNCTIONS 0
		114	#endif
		115
		116	/* The next macros try to return the current stack pointer, in an as
		117	* portable way as possible. */
		118	#define dSTACKLEVEL volatile char stacklevel
44	#define dSTACKLEVEL void *stacklevel = &stacklevel	119	#define STACKLEVEL ((void *)&stacklevel)
45		120
46	#define labs(l) ((l) >= 0 ? (l) : -(l))	121	#define IN_DESTRUCT (PL_main_cv == Nullcv)
47		122
48	/* this is actually not only the c stack but also c registers etc... */	123	#if __GNUC__ >= 3
		124	# define attribute(x) __attribute__(x)
		125	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		126	# define expect(expr,value) __builtin_expect ((expr),(value))
		127	#else
		128	# define attribute(x)
		129	# define BARRIER
		130	# define expect(expr,value) (expr)
		131	#endif
		132
		133	#define expect_false(expr) expect ((expr) != 0, 0)
		134	#define expect_true(expr) expect ((expr) != 0, 1)
		135
		136	#define NOINLINE attribute ((noinline))
		137
		138	#include "CoroAPI.h"
		139
		140	#ifdef USE_ITHREADS
		141	static perl_mutex coro_mutex;
		142	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		143	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		144	#else
		145	# define LOCK (void)0
		146	# define UNLOCK (void)0
		147	#endif
		148
		149	/* helper storage struct for Coro::AIO */
		150	struct io_state
		151	{
		152	int errorno;
		153	I32 laststype;
		154	int laststatval;
		155	Stat_t statcache;
		156	};
		157
		158	static size_t coro_stacksize = CORO_STACKSIZE;
		159	static struct CoroAPI coroapi;
		160	static AV *main_mainstack; /* used to differentiate between $main and others */
		161	static JMPENV *main_top_env;
		162	static HV *coro_state_stash, *coro_stash;
		163	static volatile SV *coro_mortal; /* will be freed after next transfer */
		164
		165	static GV *irsgv; /* $/ */
		166	static GV *stdoutgv; /* *STDOUT */
		167	static SV *rv_diehook;
		168	static SV *rv_warnhook;
		169	static HV *hv_sig; /* %SIG */
		170
		171	/* async_pool helper stuff */
		172	static SV *sv_pool_rss;
		173	static SV *sv_pool_size;
		174	static AV *av_async_pool;
		175
		176	/* Coro::AnyEvent */
		177	static SV *sv_activity;
		178
		179	static struct coro_cctx *cctx_first;
		180	static int cctx_count, cctx_idle;
		181
		182	enum {
		183	CC_MAPPED = 0x01,
		184	CC_NOREUSE = 0x02, /* throw this away after tracing */
		185	CC_TRACE = 0x04,
		186	CC_TRACE_SUB = 0x08, /* trace sub calls */
		187	CC_TRACE_LINE = 0x10, /* trace each statement */
		188	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		189	};
		190
		191	/* this is a structure representing a c-level coroutine */
		192	typedef struct coro_cctx {
		193	struct coro_cctx *next;
		194
		195	/* the stack */
		196	void *sptr;
		197	size_t ssize;
		198
		199	/* cpu state */
		200	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		201	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		202	JMPENV *top_env;
		203	coro_context cctx;
		204
		205	#if CORO_USE_VALGRIND
		206	int valgrind_id;
		207	#endif
		208	unsigned char flags;
		209	} coro_cctx;
		210
		211	enum {
		212	CF_RUNNING = 0x0001, /* coroutine is running */
		213	CF_READY = 0x0002, /* coroutine is ready */
		214	CF_NEW = 0x0004, /* has never been switched to */
		215	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		216	};
		217
		218	/* the structure where most of the perl state is stored, overlaid on the cxstack */
49	typedef struct {	219	typedef struct {
50	int refcnt; /* pointer reference counter */	220	SV *defsv;
51	int usecnt; /* shared by how many coroutines */	221	AV *defav;
52	int gencnt; /* generation counter */	222	SV *errsv;
		223	SV *irsgv;
		224	#define VAR(name,type) type name;
		225	# include "state.h"
		226	#undef VAR
		227	} perl_slots;
53		228
54	coro_context cctx;	229	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
55		230
56	void *sptr;	231	/* this is a structure representing a perl-level coroutine */
57	long ssize; /* positive == mmap, otherwise malloc */
58	} coro_stack;
59
60	struct coro {	232	struct coro {
61	/* the optional C context */	233	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	234	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65		235
66	/* optionally saved, might be zero */	236	/* process data */
67	AV *defav;
68	SV *defsv;
69	SV *errsv;
70
71	/* saved global state not related to stacks */
72	U8 dowarn;
73	I32 in_eval;
74
75	/* the stacks and related info (callchain etc..) */
76	PERL_SI *curstackinfo;
77	AV *curstack;
78	AV *mainstack;	237	AV *mainstack;
79	SV **stack_sp;	238	perl_slots *slot; /* basically the saved sp */
80	OP *op;
81	SV **curpad;
82	SV **stack_base;
83	SV **stack_max;
84	SV **tmps_stack;
85	I32 tmps_floor;
86	I32 tmps_ix;
87	I32 tmps_max;
88	I32 *markstack;
89	I32 *markstack_ptr;
90	I32 *markstack_max;
91	I32 *scopestack;
92	I32 scopestack_ix;
93	I32 scopestack_max;
94	ANY *savestack;
95	I32 savestack_ix;
96	I32 savestack_max;
97	OP **retstack;
98	I32 retstack_ix;
99	I32 retstack_max;
100	COP *curcop;
101	JMPENV *top_env;
102		239
103	/* data associated with this coroutine (initial args) */	240	AV *args; /* data associated with this coroutine (initial args) */
104	AV *args;	241	int refcnt; /* coroutines are refcounted, yes */
		242	int flags; /* CF_ flags */
		243	HV *hv; /* the perl hash associated with this coro, if any */
		244
		245	/* statistics */
		246	int usecount; /* number of transfers to this coro */
		247
		248	/* coro process data */
		249	int prio;
		250	SV *throw; /* exception to be thrown */
		251
		252	/* async_pool */
		253	SV *saved_deffh;
		254
		255	/* linked list */
		256	struct coro *next, *prev;
105	};	257	};
106		258
107	typedef struct coro *Coro__State;	259	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	260	typedef struct coro *Coro__State_or_hashref;
109		261
110	static AV *main_mainstack; /* used to differentiate between $main and others */	262	/** Coro ********************************************************************/
111	static HV *coro_state_stash;
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115		263
116	/* mostly copied from op.c:cv_clone2 */	264	#define PRIO_MAX 3
117	STATIC AV *	265	#define PRIO_HIGH 1
118	clone_padlist (AV *protopadlist)	266	#define PRIO_NORMAL 0
		267	#define PRIO_LOW -1
		268	#define PRIO_IDLE -3
		269	#define PRIO_MIN -4
		270
		271	/* for Coro.pm */
		272	static SV *coro_current;
		273	static SV *coro_readyhook;
		274	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		275	static int coro_nready;
		276	static struct coro *coro_first;
		277
		278	/** lowlevel stuff **********************************************************/
		279
		280	static SV *
		281	coro_get_sv (pTHX_ const char *name, int create)
119	{	282	{
120	AV *av;	283	#if PERL_VERSION_ATLEAST (5,10,0)
121	I32 ix;	284	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);	285	get_sv (name, create);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);	286	#endif
124	SV **pname = AvARRAY (protopad_name);	287	return get_sv (name, create);
125	SV **ppad = AvARRAY (protopad);	288	}
126	I32 fname = AvFILLp (protopad_name);	289
127	I32 fpad = AvFILLp (protopad);	290	static AV *
		291	coro_get_av (pTHX_ const char *name, int create)
		292	{
		293	#if PERL_VERSION_ATLEAST (5,10,0)
		294	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		295	get_av (name, create);
		296	#endif
		297	return get_av (name, create);
		298	}
		299
		300	static HV *
		301	coro_get_hv (pTHX_ const char *name, int create)
		302	{
		303	#if PERL_VERSION_ATLEAST (5,10,0)
		304	/* silence stupid and wrong 5.10 warning that I am unable to switch off */
		305	get_hv (name, create);
		306	#endif
		307	return get_hv (name, create);
		308	}
		309
		310	static AV *
		311	coro_clone_padlist (pTHX_ CV *cv)
		312	{
		313	AV *padlist = CvPADLIST (cv);
128	AV *newpadlist, *newpad_name, *newpad;	314	AV *newpadlist, *newpad;
129	SV **npad;
130
131	newpad_name = newAV ();
132	for (ix = fname; ix >= 0; ix--)
133	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135	newpad = newAV ();
136	av_fill (newpad, AvFILLp (protopad));
137	npad = AvARRAY (newpad);
138		315
139	newpadlist = newAV ();	316	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	317	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	318	#if PERL_VERSION_ATLEAST (5,10,0)
		319	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		320	#else
		321	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		322	#endif
		323	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		324	--AvFILLp (padlist);
		325
		326	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	327	av_store (newpadlist, 1, (SV *)newpad);
143		328
144	av = newAV (); /* will be @_ */	329	return newpadlist;
145	av_extend (av, 0);	330	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		331
149	for (ix = fpad; ix > 0; ix--)	332	static void
		333	free_padlist (pTHX_ AV *padlist)
		334	{
		335	/* may be during global destruction */
		336	if (SvREFCNT (padlist))
150	{	337	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	338	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	339	while (i >= 0)
153	{	340	{
154	char *name = SvPVX (namesv); /* XXX */	341	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	342	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	343	{
159	else
160	{ /* our own lexical */
161	SV *sv;	344	SV *sv;
162	if (*name == '&')	345	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	346	SvREFCNT_dec (sv);
164	else if (*name == '@')	347
165	sv = (SV *) newAV ();	348	SvREFCNT_dec (*svp);
166	else if (*name == '%')
167	sv = (SV *) newHV ();
168	else
169	sv = NEWSV (0, 0);
170	if (!SvPADBUSY (sv))
171	SvPADMY_on (sv);
172	npad[ix] = sv;
173	}	349	}
174	}	350	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
176	{
177	npad[ix] = SvREFCNT_inc (ppad[ix]);
178	}
179	else
180	{
181	SV *sv = NEWSV (0, 0);
182	SvPADTMP_on (sv);
183	npad[ix] = sv;
184	}
185	}
186		351
187	#if 0 /* return -ENOTUNDERSTOOD */
188	/* Now that vars are all in place, clone nested closures. */
189
190	for (ix = fpad; ix > 0; ix--) {
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
192	if (namesv
193	&& namesv != &PL_sv_undef
194	&& !(SvFLAGS(namesv) & SVf_FAKE)
195	&& *SvPVX(namesv) == '&'
196	&& CvCLONE(ppad[ix]))
197	{
198	CV *kid = cv_clone((CV*)ppad[ix]);
199	SvREFCNT_dec(ppad[ix]);
200	CvCLONE_on(kid);
201	SvPADMY_on(kid);
202	npad[ix] = (SV*)kid;
203	}
204	}
205	#endif
206
207	return newpadlist;
208	}
209
210	#ifdef MAY_FLUSH
211	STATIC AV *
212	free_padlist (AV *padlist)
213	{
214	/* may be during global destruction */
215	if (SvREFCNT(padlist))
216	{
217	I32 i = AvFILLp(padlist);
218	while (i >= 0)
219	{
220	SV **svp = av_fetch(padlist, i--, FALSE);
221	SV *sv = svp ? *svp : Nullsv;
222	if (sv)
223	SvREFCNT_dec(sv);
224	}
225
226	SvREFCNT_dec((SV*)padlist);	352	SvREFCNT_dec ((SV*)padlist);
227	}	353	}
228	}	354	}
229	#endif	355
		356	static int
		357	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		358	{
		359	AV *padlist;
		360	AV *av = (AV *)mg->mg_obj;
		361
		362	/* casting is fun. */
		363	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		364	free_padlist (aTHX_ padlist);
		365
		366	SvREFCNT_dec (av);
		367
		368	return 0;
		369	}
		370
		371	#define CORO_MAGIC_type_cv PERL_MAGIC_ext
		372	#define CORO_MAGIC_type_state PERL_MAGIC_ext
		373
		374	static MGVTBL coro_cv_vtbl = {
		375	0, 0, 0, 0,
		376	coro_cv_free
		377	};
		378
		379	#define CORO_MAGIC(sv,type) \
		380	SvMAGIC (sv) \
		381	? SvMAGIC (sv)->mg_type == type \
		382	? SvMAGIC (sv) \
		383	: mg_find (sv, type) \
		384	: 0
		385
		386	#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
		387	#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
		388
		389	static struct coro *
		390	SvSTATE_ (pTHX_ SV *coro)
		391	{
		392	HV *stash;
		393	MAGIC *mg;
		394
		395	if (SvROK (coro))
		396	coro = SvRV (coro);
		397
		398	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		399	croak ("Coro::State object required");
		400
		401	stash = SvSTASH (coro);
		402	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		403	{
		404	/* very slow, but rare, check */
		405	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		406	croak ("Coro::State object required");
		407	}
		408
		409	mg = CORO_MAGIC_state (coro);
		410	return (struct coro *)mg->mg_ptr;
		411	}
		412
		413	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
230		414
231	/* the next two functions merely cache the padlists */	415	/* the next two functions merely cache the padlists */
232	STATIC void	416	static void
233	get_padlist (CV *cv)	417	get_padlist (pTHX_ CV *cv)
234	{	418	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	419	MAGIC *mg = CORO_MAGIC_cv (cv);
		420	AV *av;
236		421
237	if (he && AvFILLp ((AV *)*he) >= 0)	422	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	423	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
239	else	424	else
240	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241	}
242
243	STATIC void
244	put_padlist (CV *cv)
245	{
246	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248	if (SvTYPE (*he) != SVt_PVAV)
249	{	425	{
		426	#if CORO_PREFER_PERL_FUNCTIONS
		427	/* this is probably cleaner? but also slower! */
		428	/* in practise, it seems to be less stable */
		429	CV *cp = Perl_cv_clone (cv);
		430	CvPADLIST (cv) = CvPADLIST (cp);
		431	CvPADLIST (cp) = 0;
250	SvREFCNT_dec (*he);	432	SvREFCNT_dec (cp);
251	*he = (SV *)newAV ();	433	#else
		434	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		435	#endif
252	}	436	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}	437	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282
283	#define SB do {
284	#define SE } while (0)
285
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
290		438
291	static void	439	static void
		440	put_padlist (pTHX_ CV *cv)
		441	{
		442	MAGIC *mg = CORO_MAGIC_cv (cv);
		443	AV *av;
		444
		445	if (expect_false (!mg))
		446	mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
		447
		448	av = (AV *)mg->mg_obj;
		449
		450	if (expect_false (AvFILLp (av) >= AvMAX (av)))
		451	av_extend (av, AvMAX (av) + 1);
		452
		453	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		454	}
		455
		456	/** load & save, init *******************************************************/
		457
		458	static void
292	load_state(pTHX_ Coro__State c)	459	load_perl (pTHX_ Coro__State c)
293	{	460	{
294	PL_dowarn = c->dowarn;	461	perl_slots *slot = c->slot;
295	PL_in_eval = c->in_eval;	462	c->slot = 0;
296		463
297	PL_curstackinfo = c->curstackinfo;
298	PL_curstack = c->curstack;
299	PL_mainstack = c->mainstack;	464	PL_mainstack = c->mainstack;
300	PL_stack_sp = c->stack_sp;
301	PL_op = c->op;
302	PL_curpad = c->curpad;
303	PL_stack_base = c->stack_base;
304	PL_stack_max = c->stack_max;
305	PL_tmps_stack = c->tmps_stack;
306	PL_tmps_floor = c->tmps_floor;
307	PL_tmps_ix = c->tmps_ix;
308	PL_tmps_max = c->tmps_max;
309	PL_markstack = c->markstack;
310	PL_markstack_ptr = c->markstack_ptr;
311	PL_markstack_max = c->markstack_max;
312	PL_scopestack = c->scopestack;
313	PL_scopestack_ix = c->scopestack_ix;
314	PL_scopestack_max = c->scopestack_max;
315	PL_savestack = c->savestack;
316	PL_savestack_ix = c->savestack_ix;
317	PL_savestack_max = c->savestack_max;
318	PL_retstack = c->retstack;
319	PL_retstack_ix = c->retstack_ix;
320	PL_retstack_max = c->retstack_max;
321	PL_curcop = c->curcop;
322	PL_top_env = c->top_env;
323		465
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	466	GvSV (PL_defgv) = slot->defsv;
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	467	GvAV (PL_defgv) = slot->defav;
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	468	GvSV (PL_errgv) = slot->errsv;
		469	GvSV (irsgv) = slot->irsgv;
		470
		471	#define VAR(name,type) PL_ ## name = slot->name;
		472	# include "state.h"
		473	#undef VAR
327		474
328	{	475	{
329	dSP;	476	dSP;
		477
330	CV *cv;	478	CV *cv;
331		479
332	/* now do the ugly restore mess */	480	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	481	while (expect_true (cv = (CV *)POPs))
334	{	482	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	483	put_padlist (aTHX_ cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	484	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	485	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	486	}
348		487
349	PUTBACK;	488	PUTBACK;
350	}	489	}
351	}	490	}
352		491
353	static void	492	static void
354	save_state(pTHX_ Coro__State c, int flags)	493	save_perl (pTHX_ Coro__State c)
355	{	494	{
356	{	495	{
357	dSP;	496	dSP;
358	I32 cxix = cxstack_ix;	497	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	498	PERL_CONTEXT *ccstk = cxstack;
…		…
362	/*	501	/*
363	* the worst thing you can imagine happens first - we have to save	502	* the worst thing you can imagine happens first - we have to save
364	* (and reinitialize) all cv's in the whole callchain :(	503	* (and reinitialize) all cv's in the whole callchain :(
365	*/	504	*/
366		505
367	PUSHs (Nullsv);	506	XPUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	507	/* this loop was inspired by pp_caller */
369	for (;;)	508	for (;;)
370	{	509	{
371	do	510	while (expect_true (cxix >= 0))
372	{	511	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	512	PERL_CONTEXT *cx = &ccstk[cxix--];
374		513
375	if (CxTYPE(cx) == CXt_SUB)	514	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
376	{	515	{
377	CV *cv = cx->blk_sub.cv;	516	CV *cv = cx->blk_sub.cv;
		517
378	if (CvDEPTH(cv))	518	if (expect_true (CvDEPTH (cv)))
379	{	519	{
380	#ifdef USE_THREADS
381	/*XPUSHs ((SV *)CvOWNER(cv));*/
382	/*CvOWNER(cv) = 0;*/
383	/*error must unlock this cv etc.. etc...*/
384	#endif
385	EXTEND (SP, CvDEPTH(cv)*2);	520	EXTEND (SP, 3);
386
387	while (--CvDEPTH(cv))
388	{
389	/* this tells the restore code to increment CvDEPTH */
390	PUSHs (Nullsv);
391	PUSHs ((SV *)cv);
392	}
393
394	PUSHs ((SV *)CvPADLIST(cv));	521	PUSHs ((SV *)CvPADLIST (cv));
		522	PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	523	PUSHs ((SV *)cv);
396		524
397	get_padlist (cv); /* this is a monster */	525	CvDEPTH (cv) = 0;
		526	get_padlist (aTHX_ cv);
398	}	527	}
399	}	528	}
400	else if (CxTYPE(cx) == CXt_FORMAT)
401	{
402	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}
406	}	529	}
407	while (cxix >= 0);
408		530
409	if (top_si->si_type == PERLSI_MAIN)	531	if (expect_true (top_si->si_type == PERLSI_MAIN))
410	break;	532	break;
411		533
412	top_si = top_si->si_prev;	534	top_si = top_si->si_prev;
413	ccstk = top_si->si_cxstack;	535	ccstk = top_si->si_cxstack;
414	cxix = top_si->si_cxix;	536	cxix = top_si->si_cxix;
415	}	537	}
416		538
417	PUTBACK;	539	PUTBACK;
418	}	540	}
419		541
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	542	/* allocate some space on the context stack for our purposes */
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	543	/* we manually unroll here, as usually 2 slots is enough */
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	544	if (SLOT_COUNT >= 1) CXINC;
		545	if (SLOT_COUNT >= 2) CXINC;
		546	if (SLOT_COUNT >= 3) CXINC;
		547	{
		548	int i;
		549	for (i = 3; i < SLOT_COUNT; ++i)
		550	CXINC;
		551	}
		552	cxstack_ix -= SLOT_COUNT; /* undo allocation */
423		553
424	/* I have not the slightest idea of why av_reify is necessary */
425	/* but if it's missing the defav contents magically get replaced sometimes */
426	if (c->defav)
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430	c->in_eval = PL_in_eval;
431
432	c->curstackinfo = PL_curstackinfo;
433	c->curstack = PL_curstack;
434	c->mainstack = PL_mainstack;	554	c->mainstack = PL_mainstack;
435	c->stack_sp = PL_stack_sp;	555
436	c->op = PL_op;	556	{
437	c->curpad = PL_curpad;	557	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
438	c->stack_base = PL_stack_base;	558
439	c->stack_max = PL_stack_max;	559	slot->defav = GvAV (PL_defgv);
440	c->tmps_stack = PL_tmps_stack;	560	slot->defsv = DEFSV;
441	c->tmps_floor = PL_tmps_floor;	561	slot->errsv = ERRSV;
442	c->tmps_ix = PL_tmps_ix;	562	slot->irsgv = GvSV (irsgv);
443	c->tmps_max = PL_tmps_max;	563
444	c->markstack = PL_markstack;	564	#define VAR(name,type) slot->name = PL_ ## name;
445	c->markstack_ptr = PL_markstack_ptr;	565	# include "state.h"
446	c->markstack_max = PL_markstack_max;	566	#undef VAR
447	c->scopestack = PL_scopestack;	567	}
448	c->scopestack_ix = PL_scopestack_ix;
449	c->scopestack_max = PL_scopestack_max;
450	c->savestack = PL_savestack;
451	c->savestack_ix = PL_savestack_ix;
452	c->savestack_max = PL_savestack_max;
453	c->retstack = PL_retstack;
454	c->retstack_ix = PL_retstack_ix;
455	c->retstack_max = PL_retstack_max;
456	c->curcop = PL_curcop;
457	c->top_env = PL_top_env;
458	}	568	}
459		569
460	/*	570	/*
461	* allocate various perl stacks. This is an exact copy	571	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	572	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	573	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	574	* not usually need a lot of stackspace.
465	*/	575	*/
466	STATIC void	576	#if CORO_PREFER_PERL_FUNCTIONS
		577	# define coro_init_stacks init_stacks
		578	#else
		579	static void
467	coro_init_stacks (pTHX)	580	coro_init_stacks (pTHX)
468	{	581	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	582	PL_curstackinfo = new_stackinfo(32, 8);
470	PL_curstackinfo->si_type = PERLSI_MAIN;	583	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	584	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	585	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		586
474	PL_stack_base = AvARRAY(PL_curstack);	587	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	588	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	589	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		590
478	New(50,PL_tmps_stack,96,SV*);	591	New(50,PL_tmps_stack,32,SV*);
479	PL_tmps_floor = -1;	592	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	593	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	594	PL_tmps_max = 32;
482		595
483	New(54,PL_markstack,16,I32);	596	New(54,PL_markstack,16,I32);
484	PL_markstack_ptr = PL_markstack;	597	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	598	PL_markstack_max = PL_markstack + 16;
486		599
		600	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	601	SET_MARK_OFFSET;
		602	#endif
488		603
489	New(54,PL_scopestack,16,I32);	604	New(54,PL_scopestack,8,I32);
490	PL_scopestack_ix = 0;	605	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	606	PL_scopestack_max = 8;
492		607
493	New(54,PL_savestack,96,ANY);	608	New(54,PL_savestack,24,ANY);
494	PL_savestack_ix = 0;	609	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	610	PL_savestack_max = 24;
496		611
		612	#if !PERL_VERSION_ATLEAST (5,10,0)
497	New(54,PL_retstack,8,OP*);	613	New(54,PL_retstack,4,OP*);
498	PL_retstack_ix = 0;	614	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	615	PL_retstack_max = 4;
		616	#endif
500	}	617	}
		618	#endif
501		619
502	/*	620	/*
503	* destroy the stacks, the callchain etc...	621	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	622	*/
506	STATIC void	623	static void
507	destroy_stacks(pTHX)	624	coro_destroy_stacks (pTHX)
508	{	625	{
509	/* is this ugly, I ask? */
510	while (PL_scopestack_ix)
511	LEAVE;
512
513	/* sure it is, but more important: is it correct?? :/ */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;
516
517	while (PL_curstackinfo->si_next)	626	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	627	PL_curstackinfo = PL_curstackinfo->si_next;
519		628
520	while (PL_curstackinfo)	629	while (PL_curstackinfo)
521	{	630	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	631	PERL_SI *p = PL_curstackinfo->si_prev;
523		632
524	{	633	if (!IN_DESTRUCT)
525	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */
528	}
529
530	dounwind(-1);
531
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	634	SvREFCNT_dec (PL_curstackinfo->si_stack);
		635
533	Safefree(PL_curstackinfo->si_cxstack);	636	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	637	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	638	PL_curstackinfo = p;
536	}	639	}
537		640
538	Safefree(PL_tmps_stack);	641	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	642	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	643	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	644	Safefree (PL_savestack);
		645	#if !PERL_VERSION_ATLEAST (5,10,0)
542	Safefree(PL_retstack);	646	Safefree (PL_retstack);
		647	#endif
		648	}
		649
		650	static size_t
		651	coro_rss (pTHX_ struct coro *coro)
		652	{
		653	size_t rss = sizeof (*coro);
		654
		655	if (coro->mainstack)
		656	{
		657	perl_slots tmp_slot;
		658	perl_slots *slot;
		659
		660	if (coro->flags & CF_RUNNING)
		661	{
		662	slot = &tmp_slot;
		663
		664	#define VAR(name,type) slot->name = PL_ ## name;
		665	# include "state.h"
		666	#undef VAR
		667	}
		668	else
		669	slot = coro->slot;
		670
		671	rss += sizeof (slot->curstackinfo);
		672	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		673	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		674	rss += slot->tmps_max * sizeof (SV *);
		675	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		676	rss += slot->scopestack_max * sizeof (I32);
		677	rss += slot->savestack_max * sizeof (ANY);
		678
		679	#if !PERL_VERSION_ATLEAST (5,10,0)
		680	rss += slot->retstack_max * sizeof (OP *);
		681	#endif
		682	}
		683
		684	return rss;
		685	}
		686
		687	/** coroutine stack handling ************************************************/
		688
		689	static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
		690	static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
		691	static int (*orig_sigelem_clr) (pTHX_ SV *sv, MAGIC *mg);
		692
		693	/* apparently < 5.8.8 */
		694	#ifndef MgPV_nolen_const
		695	#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
		696	SvPV_nolen((SV*)((mg)->mg_ptr)) : \
		697	(const char*)(mg)->mg_ptr)
		698	#endif
		699
		700	/*
		701	* This overrides the default magic get method of %SIG elements.
		702	* The original one doesn't provide for reading back of PL_diehook/PL_warnhook
		703	* and instead of tryign to save and restore the hash elements, we just provide
		704	* readback here.
		705	* We only do this when the hook is != 0, as they are often set to 0 temporarily,
		706	* not expecting this to actually change the hook. This is a potential problem
		707	* when a schedule happens then, but we ignore this.
		708	*/
		709	static int
		710	coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
		711	{
		712	const char *s = MgPV_nolen_const (mg);
		713
		714	if (*s == '_')
		715	{
		716	SV **svp = 0;
		717
		718	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		719	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		720
		721	if (svp)
		722	{
		723	sv_setsv (sv, *svp ? *svp : &PL_sv_undef);
		724	return 0;
		725	}
		726	}
		727
		728	return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
		729	}
		730
		731	static int
		732	coro_sigelem_clr (pTHX_ SV *sv, MAGIC *mg)
		733	{
		734	const char *s = MgPV_nolen_const (mg);
		735
		736	if (*s == '_')
		737	{
		738	SV **svp = 0;
		739
		740	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		741	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		742
		743	if (svp)
		744	{
		745	SV *old = *svp;
		746	*svp = 0;
		747	SvREFCNT_dec (old);
		748	return 0;
		749	}
		750	}
		751
		752	return orig_sigelem_clr ? orig_sigelem_clr (aTHX_ sv, mg) : 0;
		753	}
		754
		755	static int
		756	coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
		757	{
		758	const char *s = MgPV_nolen_const (mg);
		759
		760	if (*s == '_')
		761	{
		762	SV **svp = 0;
		763
		764	if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
		765	if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
		766
		767	if (svp)
		768	{
		769	SV *old = *svp;
		770	*svp = newSVsv (sv);
		771	SvREFCNT_dec (old);
		772	return 0;
		773	}
		774	}
		775
		776	return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
543	}	777	}
544		778
545	static void	779	static void
546	allocate_stack (Coro__State ctx, int alloc)	780	coro_setup (pTHX_ struct coro *coro)
547	{
548	coro_stack *stack;
549
550	New (0, stack, 1, coro_stack);
551
552	stack->refcnt = 1;
553	stack->usecnt = 1;
554	stack->gencnt = ctx->gencnt = 0;
555	if (alloc)
556	{
557	#ifdef HAVE_MMAP
558	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}
573
574	static void
575	deallocate_stack (Coro__State ctx)
576	{
577	coro_stack *stack = ctx->stack;
578
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void
600	setup_coro (void *arg)
601	{	781	{
602	/*	782	/*
603	* emulate part of the perl startup here.	783	* emulate part of the perl startup here.
604	*/	784	*/
605	dSP;
606	Coro__State ctx = (Coro__State)arg;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608
609	coro_init_stacks (aTHX);	785	coro_init_stacks (aTHX);
610	/*PL_curcop = 0;*/	786
611	/*PL_in_eval = PL_in_eval;*/ /* inherit */	787	PL_runops = RUNOPS_DEFAULT;
		788	PL_curcop = &PL_compiling;
		789	PL_in_eval = EVAL_NULL;
		790	PL_comppad = 0;
		791	PL_curpm = 0;
		792	PL_curpad = 0;
		793	PL_localizing = 0;
		794	PL_dirty = 0;
		795	PL_restartop = 0;
		796	#if PERL_VERSION_ATLEAST (5,10,0)
		797	PL_parser = 0;
		798	#endif
		799
		800	/* recreate the die/warn hooks */
		801	PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
		802	PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
		803
		804	GvSV (PL_defgv) = newSV (0);
		805	GvAV (PL_defgv) = coro->args; coro->args = 0;
		806	GvSV (PL_errgv) = newSV (0);
		807	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		808	PL_rs = newSVsv (GvSV (irsgv));
		809	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		810
		811	{
		812	dSP;
		813	LOGOP myop;
		814
		815	Zero (&myop, 1, LOGOP);
		816	myop.op_next = Nullop;
		817	myop.op_flags = OPf_WANT_VOID;
		818
		819	PUSHMARK (SP);
		820	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		821	PUTBACK;
		822	PL_op = (OP *)&myop;
		823	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		824	SPAGAIN;
		825	}
		826
		827	/* this newly created coroutine might be run on an existing cctx which most
		828	* likely was suspended in set_stacklevel, called from entersub.
		829	* set_stacklevl doesn't do anything on return, but entersub does LEAVE,
		830	* so we ENTER here for symmetry
		831	*/
		832	ENTER;
		833	}
		834
		835	static void
		836	coro_destroy (pTHX_ struct coro *coro)
		837	{
		838	if (!IN_DESTRUCT)
		839	{
		840	/* restore all saved variables and stuff */
		841	LEAVE_SCOPE (0);
		842	assert (PL_tmps_floor == -1);
		843
		844	/* free all temporaries */
		845	FREETMPS;
		846	assert (PL_tmps_ix == -1);
		847
		848	/* unwind all extra stacks */
		849	POPSTACK_TO (PL_mainstack);
		850
		851	/* unwind main stack */
		852	dounwind (-1);
		853	}
		854
		855	SvREFCNT_dec (GvSV (PL_defgv));
612	SvREFCNT_dec (GvAV (PL_defgv));	856	SvREFCNT_dec (GvAV (PL_defgv));
613	GvAV (PL_defgv) = ctx->args;	857	SvREFCNT_dec (GvSV (PL_errgv));
		858	SvREFCNT_dec (PL_defoutgv);
		859	SvREFCNT_dec (PL_rs);
		860	SvREFCNT_dec (GvSV (irsgv));
614		861
615	SPAGAIN;	862	SvREFCNT_dec (PL_diehook);
		863	SvREFCNT_dec (PL_warnhook);
		864
		865	SvREFCNT_dec (coro->saved_deffh);
		866	SvREFCNT_dec (coro->throw);
616		867
617	if (ctx->stack)	868	coro_destroy_stacks (aTHX);
618	{
619	ctx->cursp = 0;
620
621	PUSHMARK(SP);
622	PUTBACK;
623	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
624
625	if (SvTRUE (ERRSV))
626	croak (NULL);
627	else
628	croak ("FATAL: CCTXT coroutine returned!");
629	}
630	else
631	{
632	UNOP myop;
633
634	PL_op = (OP *)&myop;
635
636	Zero(&myop, 1, UNOP);
637	myop.op_next = Nullop;
638	myop.op_flags = OPf_WANT_VOID;
639
640	PUSHMARK(SP);
641	XPUSHs (sub_init);
642	/*
643	* the next line is slightly wrong, as PL_op->op_next
644	* is actually being executed so we skip the first op.
645	* that doesn't matter, though, since it is only
646	* pp_nextstate and we never return...
647	* ah yes, and I don't care anyways ;)
648	*/
649	PUTBACK;
650	PL_op = pp_entersub();
651	SPAGAIN;
652
653	ENTER; /* necessary e.g. for dounwind */
654	}
655	}	869	}
656		870
657	static void	871	static void
658	continue_coro (void *arg)	872	free_coro_mortal (pTHX)
659	{	873	{
660	/*	874	if (expect_true (coro_mortal))
661	* this is a _very_ stripped down perl interpreter ;)	875	{
662	*/	876	SvREFCNT_dec (coro_mortal);
663	Coro__State ctx = (Coro__State)arg;	877	coro_mortal = 0;
664
665	/*FIXME*//* must set up top_env here */
666	ctx->cursp = 0;
667	PL_op = PL_op->op_next;
668	CALLRUNOPS(aTHX);
669
670	abort ();
671	}
672
673	STATIC void
674	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
675	{
676	dSP;
677	dSTACKLEVEL;
678
679	if (prev != next)
680	{	878	}
681	if (next->mainstack)	879	}
		880
		881	static int
		882	runops_trace (pTHX)
		883	{
		884	COP *oldcop = 0;
		885	int oldcxix = -2;
		886	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		887	coro_cctx *cctx = coro->cctx;
		888
		889	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		890	{
		891	PERL_ASYNC_CHECK ();
		892
		893	if (cctx->flags & CC_TRACE_ALL)
682	{	894	{
683	SAVE (prev, flags);	895	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
684	LOAD (next);
685
686	/* mark this state as in-use */
687	next->mainstack = 0;
688	next->tmps_ix = -2;
689
690	/* stacklevel changed? if yes, grab the stack for us! */
691	if (flags & TRANSFER_SAVE_CCTXT)
692	{	896	{
693	if (!prev->stack)	897	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
694	allocate_stack (prev, 0);	898	SV **bot, **top;
695	else if (prev->cursp != stacklevel	899	AV *av = newAV (); /* return values */
696	&& prev->stack->usecnt > 1)	900	SV **cb;
		901	dSP;
		902
		903	GV *gv = CvGV (cx->blk_sub.cv);
		904	SV *fullname = sv_2mortal (newSV (0));
		905	if (isGV (gv))
		906	gv_efullname3 (fullname, gv, 0);
		907
		908	bot = PL_stack_base + cx->blk_oldsp + 1;
		909	top = cx->blk_gimme == G_ARRAY ? SP + 1
		910	: cx->blk_gimme == G_SCALAR ? bot + 1
		911	: bot;
		912
		913	av_extend (av, top - bot);
		914	while (bot < top)
		915	av_push (av, SvREFCNT_inc (*bot++));
		916
		917	PL_runops = RUNOPS_DEFAULT;
		918	ENTER;
		919	SAVETMPS;
		920	EXTEND (SP, 3);
		921	PUSHMARK (SP);
		922	PUSHs (&PL_sv_no);
		923	PUSHs (fullname);
		924	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		925	PUTBACK;
		926	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		927	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		928	SPAGAIN;
		929	FREETMPS;
		930	LEAVE;
		931	PL_runops = runops_trace;
		932	}
		933
		934	if (oldcop != PL_curcop)
		935	{
		936	oldcop = PL_curcop;
		937
		938	if (PL_curcop != &PL_compiling)
697	{	939	{
698	prev->gencnt = ++prev->stack->gencnt;	940	SV **cb;
699	prev->stack->usecnt = 1;
700	}
701		941
702	/* has our stack been invalidated? */	942	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
703	if (next->stack && next->stack->gencnt != next->gencnt)
704	{	943	{
705	deallocate_stack (next);	944	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
706	allocate_stack (next, 1);	945
707	coro_create (&(next->stack->cctx),	946	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
708	continue_coro, (void *)next,	947	{
709	next->stack->sptr, labs (next->stack->ssize));	948	runops_proc_t old_runops = PL_runops;
		949	dSP;
		950	GV *gv = CvGV (cx->blk_sub.cv);
		951	SV *fullname = sv_2mortal (newSV (0));
		952
		953	if (isGV (gv))
		954	gv_efullname3 (fullname, gv, 0);
		955
		956	PL_runops = RUNOPS_DEFAULT;
		957	ENTER;
		958	SAVETMPS;
		959	EXTEND (SP, 3);
		960	PUSHMARK (SP);
		961	PUSHs (&PL_sv_yes);
		962	PUSHs (fullname);
		963	PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		964	PUTBACK;
		965	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		966	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		967	SPAGAIN;
		968	FREETMPS;
		969	LEAVE;
		970	PL_runops = runops_trace;
		971	}
		972
		973	oldcxix = cxstack_ix;
710	}	974	}
711		975
712	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));	976	if (cctx->flags & CC_TRACE_LINE)
713	}
714
715	}
716	else if (next->tmps_ix == -2)
717	croak ("tried to transfer to running coroutine");
718	else
719	{
720	SAVE (prev, -1); /* first get rid of the old state */
721
722	if (flags & TRANSFER_SAVE_CCTXT)
723	{
724	if (!prev->stack)
725	allocate_stack (prev, 0);
726
727	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728	{	977	{
729	setup_coro (next);	978	dSP;
730		979
731	prev->stack->refcnt++;	980	PL_runops = RUNOPS_DEFAULT;
732	prev->stack->usecnt++;	981	ENTER;
733	next->stack = prev->stack;	982	SAVETMPS;
734	next->gencnt = prev->gencnt;	983	EXTEND (SP, 3);
		984	PL_runops = RUNOPS_DEFAULT;
		985	PUSHMARK (SP);
		986	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		987	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		988	PUTBACK;
		989	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		990	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		991	SPAGAIN;
		992	FREETMPS;
		993	LEAVE;
		994	PL_runops = runops_trace;
735	}	995	}
736	else
737	{
738	allocate_stack (next, 1);
739	coro_create (&(next->stack->cctx),
740	setup_coro, (void *)next,
741	next->stack->sptr, labs (next->stack->ssize));
742	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743	}	996	}
744	}	997	}
745	else
746	setup_coro (next);
747	}	998	}
748	}	999	}
749		1000
750	next->cursp = stacklevel;	1001	TAINT_NOT;
		1002	return 0;
751	}	1003	}
752		1004
		1005	/* inject a fake call to Coro::State::_cctx_init into the execution */
		1006	/* _cctx_init should be careful, as it could be called at almost any time */
		1007	/* during execution of a perl program */
		1008	static void NOINLINE
		1009	cctx_prepare (pTHX_ coro_cctx *cctx)
		1010	{
		1011	dSP;
		1012	LOGOP myop;
		1013
		1014	PL_top_env = &PL_start_env;
		1015
		1016	if (cctx->flags & CC_TRACE)
		1017	PL_runops = runops_trace;
		1018
		1019	Zero (&myop, 1, LOGOP);
		1020	myop.op_next = PL_op;
		1021	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		1022
		1023	PUSHMARK (SP);
		1024	EXTEND (SP, 2);
		1025	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		1026	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		1027	PUTBACK;
		1028	PL_op = (OP *)&myop;
		1029	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		1030	SPAGAIN;
		1031	}
		1032
		1033	/*
		1034	* this is a _very_ stripped down perl interpreter ;)
		1035	*/
		1036	static void
		1037	cctx_run (void *arg)
		1038	{
		1039	dTHX;
		1040
		1041	/* cctx_run is the alternative tail of transfer(), so unlock here. */
		1042	UNLOCK;
		1043
		1044	/* we now skip the entersub that lead to transfer() */
		1045	PL_op = PL_op->op_next;
		1046
		1047	/* inject a fake subroutine call to cctx_init */
		1048	cctx_prepare (aTHX_ (coro_cctx *)arg);
		1049
		1050	/* somebody or something will hit me for both perl_run and PL_restartop */
		1051	PL_restartop = PL_op;
		1052	perl_run (PL_curinterp);
		1053
		1054	/*
		1055	* If perl-run returns we assume exit() was being called or the coro
		1056	* fell off the end, which seems to be the only valid (non-bug)
		1057	* reason for perl_run to return. We try to exit by jumping to the
		1058	* bootstrap-time "top" top_env, as we cannot restore the "main"
		1059	* coroutine as Coro has no such concept
		1060	*/
		1061	PL_top_env = main_top_env;
		1062	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		1063	}
		1064
		1065	static coro_cctx *
		1066	cctx_new ()
		1067	{
		1068	coro_cctx *cctx;
		1069	void *stack_start;
		1070	size_t stack_size;
		1071
		1072	++cctx_count;
		1073
		1074	Newz (0, cctx, 1, coro_cctx);
		1075
		1076	#if HAVE_MMAP
		1077	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		1078	/* mmap supposedly does allocate-on-write for us */
		1079	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		1080
		1081	if (cctx->sptr != (void *)-1)
		1082	{
		1083	# if CORO_STACKGUARD
		1084	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		1085	# endif
		1086	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		1087	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		1088	cctx->flags |= CC_MAPPED;
		1089	}
		1090	else
		1091	#endif
		1092	{
		1093	cctx->ssize = coro_stacksize * (long)sizeof (long);
		1094	New (0, cctx->sptr, coro_stacksize, long);
		1095
		1096	if (!cctx->sptr)
		1097	{
		1098	perror ("FATAL: unable to allocate stack for coroutine");
		1099	_exit (EXIT_FAILURE);
		1100	}
		1101
		1102	stack_start = cctx->sptr;
		1103	stack_size = cctx->ssize;
		1104	}
		1105
		1106	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		1107	coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
		1108
		1109	return cctx;
		1110	}
		1111
		1112	static void
		1113	cctx_destroy (coro_cctx *cctx)
		1114	{
		1115	if (!cctx)
		1116	return;
		1117
		1118	--cctx_count;
		1119
		1120	#if CORO_USE_VALGRIND
		1121	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		1122	#endif
		1123
		1124	#if HAVE_MMAP
		1125	if (cctx->flags & CC_MAPPED)
		1126	munmap (cctx->sptr, cctx->ssize);
		1127	else
		1128	#endif
		1129	Safefree (cctx->sptr);
		1130
		1131	Safefree (cctx);
		1132	}
		1133
		1134	/* wether this cctx should be destructed */
		1135	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		1136
		1137	static coro_cctx *
		1138	cctx_get (pTHX)
		1139	{
		1140	while (expect_true (cctx_first))
		1141	{
		1142	coro_cctx *cctx = cctx_first;
		1143	cctx_first = cctx->next;
		1144	--cctx_idle;
		1145
		1146	if (expect_true (!CCTX_EXPIRED (cctx)))
		1147	return cctx;
		1148
		1149	cctx_destroy (cctx);
		1150	}
		1151
		1152	return cctx_new ();
		1153	}
		1154
		1155	static void
		1156	cctx_put (coro_cctx *cctx)
		1157	{
		1158	/* free another cctx if overlimit */
		1159	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		1160	{
		1161	coro_cctx *first = cctx_first;
		1162	cctx_first = first->next;
		1163	--cctx_idle;
		1164
		1165	cctx_destroy (first);
		1166	}
		1167
		1168	++cctx_idle;
		1169	cctx->next = cctx_first;
		1170	cctx_first = cctx;
		1171	}
		1172
		1173	/** coroutine switching *****************************************************/
		1174
		1175	static void
		1176	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1177	{
		1178	if (expect_true (prev != next))
		1179	{
		1180	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1181	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1182
		1183	if (expect_false (next->flags & CF_RUNNING))
		1184	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1185
		1186	if (expect_false (next->flags & CF_DESTROYED))
		1187	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1188
		1189	#if !PERL_VERSION_ATLEAST (5,10,0)
		1190	if (expect_false (PL_lex_state != LEX_NOTPARSING))
		1191	croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version");
		1192	#endif
		1193	}
		1194	}
		1195
		1196	/* always use the TRANSFER macro */
		1197	static void NOINLINE
		1198	transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
		1199	{
		1200	dSTACKLEVEL;
		1201	static volatile int has_throw;
		1202
		1203	/* sometimes transfer is only called to set idle_sp */
		1204	if (expect_false (!next))
		1205	{
		1206	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1207	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		1208	}
		1209	else if (expect_true (prev != next))
		1210	{
		1211	coro_cctx *prev__cctx;
		1212
		1213	if (expect_false (prev->flags & CF_NEW))
		1214	{
		1215	/* create a new empty context */
		1216	Newz (0, prev->cctx, 1, coro_cctx);
		1217	prev->flags &= ~CF_NEW;
		1218	prev->flags |= CF_RUNNING;
		1219	}
		1220
		1221	prev->flags &= ~CF_RUNNING;
		1222	next->flags |= CF_RUNNING;
		1223
		1224	LOCK;
		1225
		1226	/* first get rid of the old state */
		1227	save_perl (aTHX_ prev);
		1228
		1229	if (expect_false (next->flags & CF_NEW))
		1230	{
		1231	/* need to start coroutine */
		1232	next->flags &= ~CF_NEW;
		1233	/* setup coroutine call */
		1234	coro_setup (aTHX_ next);
		1235	}
		1236	else
		1237	load_perl (aTHX_ next);
		1238
		1239	prev__cctx = prev->cctx;
		1240
		1241	/* possibly "free" the cctx */
		1242	if (expect_true (
		1243	prev__cctx->idle_sp == STACKLEVEL
		1244	&& !(prev__cctx->flags & CC_TRACE)
		1245	&& !force_cctx
		1246	))
		1247	{
		1248	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1249	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1250
		1251	prev->cctx = 0;
		1252
		1253	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1254	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1255	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1256	if (!next->cctx)
		1257	next->cctx = cctx_get (aTHX);
		1258
		1259	cctx_put (prev__cctx);
		1260	}
		1261
		1262	++next->usecount;
		1263
		1264	if (expect_true (!next->cctx))
		1265	next->cctx = cctx_get (aTHX);
		1266
		1267	has_throw = !!next->throw;
		1268
		1269	if (expect_false (prev__cctx != next->cctx))
		1270	{
		1271	prev__cctx->top_env = PL_top_env;
		1272	PL_top_env = next->cctx->top_env;
		1273	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1274	}
		1275
		1276	free_coro_mortal (aTHX);
		1277	UNLOCK;
		1278
		1279	if (expect_false (has_throw))
		1280	{
		1281	struct coro *coro = SvSTATE (coro_current);
		1282
		1283	if (coro->throw)
		1284	{
		1285	SV *exception = coro->throw;
		1286	coro->throw = 0;
		1287	sv_setsv (ERRSV, exception);
		1288	croak (0);
		1289	}
		1290	}
		1291	}
		1292	}
		1293
		1294	struct transfer_args
		1295	{
		1296	struct coro *prev, *next;
		1297	};
		1298
		1299	#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
		1300	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1301
		1302	/** high level stuff ********************************************************/
		1303
		1304	static int
		1305	coro_state_destroy (pTHX_ struct coro *coro)
		1306	{
		1307	if (coro->flags & CF_DESTROYED)
		1308	return 0;
		1309
		1310	coro->flags |= CF_DESTROYED;
		1311
		1312	if (coro->flags & CF_READY)
		1313	{
		1314	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1315	/* alternative: look through all ready queues and remove the coro */
		1316	LOCK;
		1317	--coro_nready;
		1318	UNLOCK;
		1319	}
		1320	else
		1321	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
		1322
		1323	if (coro->mainstack && coro->mainstack != main_mainstack)
		1324	{
		1325	struct coro temp;
		1326
		1327	if (coro->flags & CF_RUNNING)
		1328	croak ("FATAL: tried to destroy currently running coroutine");
		1329
		1330	save_perl (aTHX_ &temp);
		1331	load_perl (aTHX_ coro);
		1332
		1333	coro_destroy (aTHX_ coro);
		1334
		1335	load_perl (aTHX_ &temp);
		1336
		1337	coro->slot = 0;
		1338	}
		1339
		1340	cctx_destroy (coro->cctx);
		1341	SvREFCNT_dec (coro->args);
		1342
		1343	if (coro->next) coro->next->prev = coro->prev;
		1344	if (coro->prev) coro->prev->next = coro->next;
		1345	if (coro == coro_first) coro_first = coro->next;
		1346
		1347	return 1;
		1348	}
		1349
		1350	static int
		1351	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1352	{
		1353	struct coro *coro = (struct coro *)mg->mg_ptr;
		1354	mg->mg_ptr = 0;
		1355
		1356	coro->hv = 0;
		1357
		1358	if (--coro->refcnt < 0)
		1359	{
		1360	coro_state_destroy (aTHX_ coro);
		1361	Safefree (coro);
		1362	}
		1363
		1364	return 0;
		1365	}
		1366
		1367	static int
		1368	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1369	{
		1370	struct coro *coro = (struct coro *)mg->mg_ptr;
		1371
		1372	++coro->refcnt;
		1373
		1374	return 0;
		1375	}
		1376
		1377	static MGVTBL coro_state_vtbl = {
		1378	0, 0, 0, 0,
		1379	coro_state_free,
		1380	0,
		1381	#ifdef MGf_DUP
		1382	coro_state_dup,
		1383	#else
		1384	# define MGf_DUP 0
		1385	#endif
		1386	};
		1387
		1388	static void
		1389	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1390	{
		1391	ta->prev = SvSTATE (prev_sv);
		1392	ta->next = SvSTATE (next_sv);
		1393	TRANSFER_CHECK (*ta);
		1394	}
		1395
		1396	static void
		1397	api_transfer (SV *prev_sv, SV *next_sv)
		1398	{
		1399	dTHX;
		1400	struct transfer_args ta;
		1401
		1402	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1403	TRANSFER (ta, 1);
		1404	}
		1405
		1406	/** Coro ********************************************************************/
		1407
		1408	static void
		1409	coro_enq (pTHX_ SV *coro_sv)
		1410	{
		1411	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		1412	}
		1413
		1414	static SV *
		1415	coro_deq (pTHX)
		1416	{
		1417	int prio;
		1418
		1419	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
		1420	if (AvFILLp (coro_ready [prio]) >= 0)
		1421	return av_shift (coro_ready [prio]);
		1422
		1423	return 0;
		1424	}
		1425
		1426	static int
		1427	api_ready (SV *coro_sv)
		1428	{
		1429	dTHX;
		1430	struct coro *coro;
		1431	SV *sv_hook;
		1432	void (*xs_hook)(void);
		1433
		1434	if (SvROK (coro_sv))
		1435	coro_sv = SvRV (coro_sv);
		1436
		1437	coro = SvSTATE (coro_sv);
		1438
		1439	if (coro->flags & CF_READY)
		1440	return 0;
		1441
		1442	coro->flags |= CF_READY;
		1443
		1444	LOCK;
		1445
		1446	sv_hook = coro_nready ? 0 : coro_readyhook;
		1447	xs_hook = coro_nready ? 0 : coroapi.readyhook;
		1448
		1449	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1450	++coro_nready;
		1451
		1452	UNLOCK;
		1453
		1454	if (sv_hook)
		1455	{
		1456	dSP;
		1457
		1458	ENTER;
		1459	SAVETMPS;
		1460
		1461	PUSHMARK (SP);
		1462	PUTBACK;
		1463	call_sv (sv_hook, G_DISCARD);
		1464	SPAGAIN;
		1465
		1466	FREETMPS;
		1467	LEAVE;
		1468	}
		1469
		1470	if (xs_hook)
		1471	xs_hook ();
		1472
		1473	return 1;
		1474	}
		1475
		1476	static int
		1477	api_is_ready (SV *coro_sv)
		1478	{
		1479	dTHX;
		1480	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1481	}
		1482
		1483	static void
		1484	prepare_schedule (pTHX_ struct transfer_args *ta)
		1485	{
		1486	SV *prev_sv, *next_sv;
		1487
		1488	for (;;)
		1489	{
		1490	LOCK;
		1491	next_sv = coro_deq (aTHX);
		1492
		1493	/* nothing to schedule: call the idle handler */
		1494	if (expect_false (!next_sv))
		1495	{
		1496	dSP;
		1497	UNLOCK;
		1498
		1499	ENTER;
		1500	SAVETMPS;
		1501
		1502	PUSHMARK (SP);
		1503	PUTBACK;
		1504	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1505	SPAGAIN;
		1506
		1507	FREETMPS;
		1508	LEAVE;
		1509	continue;
		1510	}
		1511
		1512	ta->next = SvSTATE (next_sv);
		1513
		1514	/* cannot transfer to destroyed coros, skip and look for next */
		1515	if (expect_false (ta->next->flags & CF_DESTROYED))
		1516	{
		1517	UNLOCK;
		1518	SvREFCNT_dec (next_sv);
		1519	/* coro_nready is already taken care of by destroy */
		1520	continue;
		1521	}
		1522
		1523	--coro_nready;
		1524	UNLOCK;
		1525	break;
		1526	}
		1527
		1528	/* free this only after the transfer */
		1529	prev_sv = SvRV (coro_current);
		1530	ta->prev = SvSTATE (prev_sv);
		1531	TRANSFER_CHECK (*ta);
		1532	assert (ta->next->flags & CF_READY);
		1533	ta->next->flags &= ~CF_READY;
		1534	SvRV_set (coro_current, next_sv);
		1535
		1536	LOCK;
		1537	free_coro_mortal (aTHX);
		1538	coro_mortal = prev_sv;
		1539	UNLOCK;
		1540	}
		1541
		1542	static void
		1543	prepare_cede (pTHX_ struct transfer_args *ta)
		1544	{
		1545	api_ready (coro_current);
		1546	prepare_schedule (aTHX_ ta);
		1547	}
		1548
		1549	static int
		1550	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1551	{
		1552	if (coro_nready)
		1553	{
		1554	SV *prev = SvRV (coro_current);
		1555	prepare_schedule (aTHX_ ta);
		1556	api_ready (prev);
		1557	return 1;
		1558	}
		1559	else
		1560	return 0;
		1561	}
		1562
		1563	static void
		1564	api_schedule (void)
		1565	{
		1566	dTHX;
		1567	struct transfer_args ta;
		1568
		1569	prepare_schedule (aTHX_ &ta);
		1570	TRANSFER (ta, 1);
		1571	}
		1572
		1573	static int
		1574	api_cede (void)
		1575	{
		1576	dTHX;
		1577	struct transfer_args ta;
		1578
		1579	prepare_cede (aTHX_ &ta);
		1580
		1581	if (expect_true (ta.prev != ta.next))
		1582	{
		1583	TRANSFER (ta, 1);
		1584	return 1;
		1585	}
		1586	else
		1587	return 0;
		1588	}
		1589
		1590	static int
		1591	api_cede_notself (void)
		1592	{
		1593	dTHX;
		1594	struct transfer_args ta;
		1595
		1596	if (prepare_cede_notself (aTHX_ &ta))
		1597	{
		1598	TRANSFER (ta, 1);
		1599	return 1;
		1600	}
		1601	else
		1602	return 0;
		1603	}
		1604
		1605	static void
		1606	api_trace (SV *coro_sv, int flags)
		1607	{
		1608	dTHX;
		1609	struct coro *coro = SvSTATE (coro_sv);
		1610
		1611	if (flags & CC_TRACE)
		1612	{
		1613	if (!coro->cctx)
		1614	coro->cctx = cctx_new ();
		1615	else if (!(coro->cctx->flags & CC_TRACE))
		1616	croak ("cannot enable tracing on coroutine with custom stack");
		1617
		1618	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1619	}
		1620	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1621	{
		1622	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1623
		1624	if (coro->flags & CF_RUNNING)
		1625	PL_runops = RUNOPS_DEFAULT;
		1626	else
		1627	coro->slot->runops = RUNOPS_DEFAULT;
		1628	}
		1629	}
		1630
		1631	static int
		1632	coro_gensub_free (pTHX_ SV *sv, MAGIC *mg)
		1633	{
		1634	AV *padlist;
		1635	AV *av = (AV *)mg->mg_obj;
		1636
		1637	abort ();
		1638
		1639	return 0;
		1640	}
		1641
		1642	static MGVTBL coro_gensub_vtbl = {
		1643	0, 0, 0, 0,
		1644	coro_gensub_free
		1645	};
		1646
753	MODULE = Coro::State PACKAGE = Coro::State	1647	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
754		1648
755	PROTOTYPES: ENABLE	1649	PROTOTYPES: DISABLE
756		1650
757	BOOT:	1651	BOOT:
758	{ /* {} necessary for stoopid perl-5.6.x */	1652	{
759	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1653	#ifdef USE_ITHREADS
760	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1654	MUTEX_INIT (&coro_mutex);
		1655	#endif
		1656	BOOT_PAGESIZE;
		1657
		1658	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
		1659	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1660
		1661	orig_sigelem_get = PL_vtbl_sigelem.svt_get; PL_vtbl_sigelem.svt_get = coro_sigelem_get;
		1662	orig_sigelem_set = PL_vtbl_sigelem.svt_set; PL_vtbl_sigelem.svt_set = coro_sigelem_set;
		1663	orig_sigelem_clr = PL_vtbl_sigelem.svt_clear; PL_vtbl_sigelem.svt_clear = coro_sigelem_clr;
		1664
		1665	hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
		1666	rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
		1667	rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
		1668
761	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1669	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
762		1670
763	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1671	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
764	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1672	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
765	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1673	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
766	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1674	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
767
768	if (!padlist_cache)
769	padlist_cache = newHV ();
770		1675
771	main_mainstack = PL_mainstack;	1676	main_mainstack = PL_mainstack;
772	}	1677	main_top_env = PL_top_env;
773		1678
774	Coro::State	1679	while (main_top_env->je_prev)
775	_newprocess(args)	1680	main_top_env = main_top_env->je_prev;
776	SV * args	1681
777	PROTOTYPE: $	1682	coroapi.ver = CORO_API_VERSION;
		1683	coroapi.rev = CORO_API_REVISION;
		1684	coroapi.transfer = api_transfer;
		1685
		1686	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1687	}
		1688
		1689	SV *
		1690	new (char *klass, ...)
778	CODE:	1691	CODE:
779	Coro__State coro;	1692	{
		1693	struct coro *coro;
		1694	MAGIC *mg;
		1695	HV *hv;
		1696	int i;
780		1697
781	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
782	croak ("Coro::State::_newprocess expects an arrayref");
783
784	New (0, coro, 1, struct coro);	1698	Newz (0, coro, 1, struct coro);
		1699	coro->args = newAV ();
		1700	coro->flags = CF_NEW;
785		1701
786	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1702	if (coro_first) coro_first->prev = coro;
787	coro->mainstack = 0; /* actual work is done inside transfer */	1703	coro->next = coro_first;
788	coro->stack = 0;	1704	coro_first = coro;
789		1705
790	RETVAL = coro;	1706	coro->hv = hv = newHV ();
		1707	mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
		1708	mg->mg_flags |= MGf_DUP;
		1709	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1710
		1711	av_extend (coro->args, items - 1);
		1712	for (i = 1; i < items; i++)
		1713	av_push (coro->args, newSVsv (ST (i)));
		1714	}
791	OUTPUT:	1715	OUTPUT:
792	RETVAL	1716	RETVAL
793		1717
		1718	# these not obviously related functions are all rolled into the same xs
		1719	# function to increase chances that they all will call transfer with the same
		1720	# stack offset
794	void	1721	void
795	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1722	_set_stacklevel (...)
796	Coro::State_or_hashref prev	1723	ALIAS:
797	Coro::State_or_hashref next	1724	Coro::State::transfer = 1
798	int flags	1725	Coro::schedule = 2
799	PROTOTYPE: @	1726	Coro::cede = 3
		1727	Coro::cede_notself = 4
800	CODE:	1728	CODE:
		1729	{
		1730	struct transfer_args ta;
		1731
801	PUTBACK;	1732	PUTBACK;
802	transfer (aTHX_ prev, next, flags);	1733	switch (ix)
		1734	{
		1735	case 0:
		1736	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1737	ta.next = 0;
		1738	break;
		1739
		1740	case 1:
		1741	if (items != 2)
		1742	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1743
		1744	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1745	break;
		1746
		1747	case 2:
		1748	prepare_schedule (aTHX_ &ta);
		1749	break;
		1750
		1751	case 3:
		1752	prepare_cede (aTHX_ &ta);
		1753	break;
		1754
		1755	case 4:
		1756	if (!prepare_cede_notself (aTHX_ &ta))
		1757	XSRETURN_EMPTY;
		1758
		1759	break;
		1760	}
803	SPAGAIN;	1761	SPAGAIN;
804		1762
		1763	BARRIER;
		1764	PUTBACK;
		1765	TRANSFER (ta, 0);
		1766	SPAGAIN; /* might be the sp of a different coroutine now */
		1767	/* be extra careful not to ever do anything after TRANSFER */
		1768	}
		1769
		1770	bool
		1771	_destroy (SV *coro_sv)
		1772	CODE:
		1773	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1774	OUTPUT:
		1775	RETVAL
		1776
805	void	1777	void
806	DESTROY(coro)	1778	_exit (int code)
807	Coro::State coro	1779	PROTOTYPE: $
808	CODE:	1780	CODE:
		1781	_exit (code);
809		1782
810	if (coro->mainstack && coro->mainstack != main_mainstack)	1783	int
		1784	cctx_stacksize (int new_stacksize = 0)
		1785	CODE:
		1786	RETVAL = coro_stacksize;
		1787	if (new_stacksize)
		1788	coro_stacksize = new_stacksize;
		1789	OUTPUT:
		1790	RETVAL
		1791
		1792	int
		1793	cctx_count ()
		1794	CODE:
		1795	RETVAL = cctx_count;
		1796	OUTPUT:
		1797	RETVAL
		1798
		1799	int
		1800	cctx_idle ()
		1801	CODE:
		1802	RETVAL = cctx_idle;
		1803	OUTPUT:
		1804	RETVAL
		1805
		1806	void
		1807	list ()
		1808	PPCODE:
		1809	{
		1810	struct coro *coro;
		1811	for (coro = coro_first; coro; coro = coro->next)
		1812	if (coro->hv)
		1813	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1814	}
		1815
		1816	void
		1817	call (Coro::State coro, SV *coderef)
		1818	ALIAS:
		1819	eval = 1
		1820	CODE:
		1821	{
		1822	if (coro->mainstack)
811	{	1823	{
812	struct coro temp;	1824	struct coro temp;
813		1825
814	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1826	if (!(coro->flags & CF_RUNNING))
815	LOAD(aTHX_ coro);	1827	{
		1828	PUTBACK;
		1829	save_perl (aTHX_ &temp);
		1830	load_perl (aTHX_ coro);
		1831	}
816		1832
817	destroy_stacks (aTHX);	1833	{
		1834	dSP;
		1835	ENTER;
		1836	SAVETMPS;
		1837	PUTBACK;
		1838	PUSHSTACK;
		1839	PUSHMARK (SP);
818		1840
819	LOAD((&temp)); /* this will get rid of defsv etc.. */	1841	if (ix)
		1842	eval_sv (coderef, 0);
		1843	else
		1844	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
820		1845
821	coro->mainstack = 0;	1846	POPSTACK;
		1847	SPAGAIN;
		1848	FREETMPS;
		1849	LEAVE;
		1850	PUTBACK;
		1851	}
		1852
		1853	if (!(coro->flags & CF_RUNNING))
		1854	{
		1855	save_perl (aTHX_ coro);
		1856	load_perl (aTHX_ &temp);
		1857	SPAGAIN;
		1858	}
822	}	1859	}
		1860	}
823		1861
824	deallocate_stack (coro);	1862	SV *
825		1863	is_ready (Coro::State coro)
826	Safefree (coro);	1864	PROTOTYPE: $
		1865	ALIAS:
		1866	is_ready = CF_READY
		1867	is_running = CF_RUNNING
		1868	is_new = CF_NEW
		1869	is_destroyed = CF_DESTROYED
		1870	CODE:
		1871	RETVAL = boolSV (coro->flags & ix);
		1872	OUTPUT:
		1873	RETVAL
827		1874
828	void	1875	void
829	flush()	1876	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
830	CODE:
831	#ifdef MAY_FLUSH
832	flush_padlist_cache ();
833	#endif
834		1877
835	void	1878	SV *
836	_exit(code)	1879	has_cctx (Coro::State coro)
837	int code
838	PROTOTYPE: $	1880	PROTOTYPE: $
839	CODE:	1881	CODE:
840	#if defined(__GLIBC__) || _POSIX_C_SOURCE	1882	RETVAL = boolSV (!!coro->cctx);
841	_exit (code);	1883	OUTPUT:
842	#else	1884	RETVAL
843	signal (SIGTERM, SIG_DFL);
844	raise (SIGTERM);
845	exit (code);
846	#endif
847		1885
848	MODULE = Coro::State PACKAGE = Coro::Cont	1886	int
		1887	is_traced (Coro::State coro)
		1888	PROTOTYPE: $
		1889	CODE:
		1890	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1891	OUTPUT:
		1892	RETVAL
849		1893
850	# this is slightly dirty	1894	IV
		1895	rss (Coro::State coro)
		1896	PROTOTYPE: $
		1897	ALIAS:
		1898	usecount = 1
		1899	CODE:
		1900	switch (ix)
		1901	{
		1902	case 0: RETVAL = coro_rss (aTHX_ coro); break;
		1903	case 1: RETVAL = coro->usecount; break;
		1904	}
		1905	OUTPUT:
		1906	RETVAL
851		1907
852	void	1908	void
853	yield(...)	1909	force_cctx ()
		1910	CODE:
		1911	struct coro *coro = SvSTATE (coro_current);
		1912	coro->cctx->idle_sp = 0;
		1913
		1914	void
		1915	throw (Coro::State self, SV *throw = &PL_sv_undef)
		1916	PROTOTYPE: $;$
		1917	CODE:
		1918	SvREFCNT_dec (self->throw);
		1919	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1920
		1921	void
		1922	swap_defsv (Coro::State self)
		1923	PROTOTYPE: $
		1924	ALIAS:
		1925	swap_defav = 1
		1926	CODE:
		1927	if (!self->slot)
		1928	croak ("cannot swap state with coroutine that has no saved state");
		1929	else
		1930	{
		1931	SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
		1932	SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
		1933
		1934	SV *tmp = *src; *src = *dst; *dst = tmp;
		1935	}
		1936
		1937	MODULE = Coro::State PACKAGE = Coro
		1938
		1939	BOOT:
		1940	{
		1941	int i;
		1942
		1943	av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
		1944	sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
		1945	sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
		1946
		1947	coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
		1948	SvREADONLY_on (coro_current);
		1949
		1950	coro_stash = gv_stashpv ("Coro", TRUE);
		1951
		1952	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1953	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1954	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1955	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1956	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1957	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1958
		1959	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1960	coro_ready[i] = newAV ();
		1961
		1962	{
		1963	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1964	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
		1965
		1966	coroapi.schedule = api_schedule;
		1967	coroapi.cede = api_cede;
		1968	coroapi.cede_notself = api_cede_notself;
		1969	coroapi.ready = api_ready;
		1970	coroapi.is_ready = api_is_ready;
		1971	coroapi.nready = &coro_nready;
		1972	coroapi.current = coro_current;
		1973
		1974	GCoroAPI = &coroapi;
		1975	sv_setiv (sv, (IV)&coroapi);
		1976	SvREADONLY_on (sv);
		1977	}
		1978	}
		1979
		1980	void
		1981	_set_current (SV *current)
		1982	PROTOTYPE: $
		1983	CODE:
		1984	SvREFCNT_dec (SvRV (coro_current));
		1985	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1986
		1987	void
		1988	_set_readyhook (SV *hook)
		1989	PROTOTYPE: $
		1990	CODE:
		1991	LOCK;
		1992	SvREFCNT_dec (coro_readyhook);
		1993	coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
		1994	UNLOCK;
		1995
		1996	int
		1997	prio (Coro::State coro, int newprio = 0)
		1998	ALIAS:
		1999	nice = 1
		2000	CODE:
		2001	{
		2002	RETVAL = coro->prio;
		2003
		2004	if (items > 1)
		2005	{
		2006	if (ix)
		2007	newprio = coro->prio - newprio;
		2008
		2009	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		2010	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		2011
		2012	coro->prio = newprio;
		2013	}
		2014	}
		2015	OUTPUT:
		2016	RETVAL
		2017
		2018	SV *
		2019	ready (SV *self)
		2020	PROTOTYPE: $
		2021	CODE:
		2022	RETVAL = boolSV (api_ready (self));
		2023	OUTPUT:
		2024	RETVAL
		2025
		2026	int
		2027	nready (...)
		2028	PROTOTYPE:
		2029	CODE:
		2030	RETVAL = coro_nready;
		2031	OUTPUT:
		2032	RETVAL
		2033
		2034	# for async_pool speedup
		2035	void
		2036	_pool_1 (SV *cb)
		2037	CODE:
		2038	{
		2039	struct coro *coro = SvSTATE (coro_current);
		2040	HV *hv = (HV *)SvRV (coro_current);
		2041	AV *defav = GvAV (PL_defgv);
		2042	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		2043	AV *invoke_av;
		2044	int i, len;
		2045
		2046	if (!invoke)
		2047	{
		2048	SV *old = PL_diehook;
		2049	PL_diehook = 0;
		2050	SvREFCNT_dec (old);
		2051	croak ("\3async_pool terminate\2\n");
		2052	}
		2053
		2054	SvREFCNT_dec (coro->saved_deffh);
		2055	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		2056
		2057	hv_store (hv, "desc", sizeof ("desc") - 1,
		2058	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		2059
		2060	invoke_av = (AV *)SvRV (invoke);
		2061	len = av_len (invoke_av);
		2062
		2063	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		2064
		2065	if (len > 0)
		2066	{
		2067	av_fill (defav, len - 1);
		2068	for (i = 0; i < len; ++i)
		2069	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		2070	}
		2071
		2072	SvREFCNT_dec (invoke);
		2073	}
		2074
		2075	void
		2076	_pool_2 (SV *cb)
		2077	CODE:
		2078	{
		2079	struct coro *coro = SvSTATE (coro_current);
		2080
		2081	sv_setsv (cb, &PL_sv_undef);
		2082
		2083	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		2084	coro->saved_deffh = 0;
		2085
		2086	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		2087	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		2088	{
		2089	SV *old = PL_diehook;
		2090	PL_diehook = 0;
		2091	SvREFCNT_dec (old);
		2092	croak ("\3async_pool terminate\2\n");
		2093	}
		2094
		2095	av_clear (GvAV (PL_defgv));
		2096	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		2097	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		2098
		2099	coro->prio = 0;
		2100
		2101	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		2102	api_trace (coro_current, 0);
		2103
		2104	av_push (av_async_pool, newSVsv (coro_current));
		2105	}
		2106
		2107	#if 0
		2108
		2109	void
		2110	_generator_call (...)
854	PROTOTYPE: @	2111	PROTOTYPE: @
		2112	PPCODE:
		2113	fprintf (stderr, "call %p\n", CvXSUBANY(cv).any_ptr);
		2114	xxxx
		2115	abort ();
		2116
		2117	SV *
		2118	gensub (SV *sub, ...)
		2119	PROTOTYPE: &;@
855	CODE:	2120	CODE:
856	static SV *returnstk;	2121	{
		2122	struct coro *coro;
		2123	MAGIC *mg;
857	SV *sv;	2124	CV *xcv;
858	AV *defav = GvAV (PL_defgv);	2125	CV *ncv = (CV *)newSV_type (SVt_PVCV);
859	struct coro *prev, *next;	2126	int i;
860		2127
861	if (!returnstk)	2128	CvGV (ncv) = CvGV (cv);
862	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	2129	CvFILE (ncv) = CvFILE (cv);
863		2130
864	/* set up @_ -- ugly */	2131	Newz (0, coro, 1, struct coro);
865	av_clear (defav);	2132	coro->args = newAV ();
866	av_fill (defav, items - 1);	2133	coro->flags = CF_NEW;
867	while (items--)
868	av_store (defav, items, SvREFCNT_inc (ST(items)));
869		2134
870	mg_get (returnstk); /* isn't documentation wrong for mg_get? */	2135	av_extend (coro->args, items - 1);
871	sv = av_pop ((AV *)SvRV (returnstk));	2136	for (i = 1; i < items; i++)
872	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));	2137	av_push (coro->args, newSVsv (ST (i)));
873	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
874	SvREFCNT_dec (sv);
875		2138
876	transfer(aTHX_ prev, next, 0);	2139	CvISXSUB_on (ncv);
		2140	CvXSUBANY (ncv).any_ptr = (void *)coro;
877		2141
		2142	xcv = GvCV (gv_fetchpv ("Coro::_generator_call", 0, SVt_PVCV));
		2143
		2144	CvXSUB (ncv) = CvXSUB (xcv);
		2145	CvANON_on (ncv);
		2146
		2147	mg = sv_magicext ((SV *)ncv, 0, CORO_MAGIC_type_state, &coro_gensub_vtbl, (char *)coro, 0);
		2148	RETVAL = newRV_noinc ((SV *)ncv);
		2149	}
		2150	OUTPUT:
		2151	RETVAL
		2152
		2153	#endif
		2154
		2155
		2156	MODULE = Coro::State PACKAGE = Coro::AIO
		2157
		2158	SV *
		2159	_get_state ()
		2160	CODE:
		2161	{
		2162	struct io_state *data;
		2163
		2164	RETVAL = newSV (sizeof (struct io_state));
		2165	data = (struct io_state *)SvPVX (RETVAL);
		2166	SvCUR_set (RETVAL, sizeof (struct io_state));
		2167	SvPOK_only (RETVAL);
		2168
		2169	data->errorno = errno;
		2170	data->laststype = PL_laststype;
		2171	data->laststatval = PL_laststatval;
		2172	data->statcache = PL_statcache;
		2173	}
		2174	OUTPUT:
		2175	RETVAL
		2176
		2177	void
		2178	_set_state (char *data_)
		2179	PROTOTYPE: $
		2180	CODE:
		2181	{
		2182	struct io_state *data = (void *)data_;
		2183
		2184	errno = data->errorno;
		2185	PL_laststype = data->laststype;
		2186	PL_laststatval = data->laststatval;
		2187	PL_statcache = data->statcache;
		2188	}
		2189
		2190
		2191	MODULE = Coro::State PACKAGE = Coro::AnyEvent
		2192
		2193	BOOT:
		2194	sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
		2195
		2196	SV *
		2197	_schedule (...)
		2198	PROTOTYPE: @
		2199	CODE:
		2200	{
		2201	static int incede;
		2202
		2203	api_cede_notself ();
		2204
		2205	++incede;
		2206	while (coro_nready >= incede && api_cede ())
		2207	;
		2208
		2209	sv_setsv (sv_activity, &PL_sv_undef);
		2210	if (coro_nready >= incede)
		2211	{
		2212	PUSHMARK (SP);
		2213	PUTBACK;
		2214	call_pv ("Coro::AnyEvent::_activity", G_DISCARD | G_EVAL);
		2215	SPAGAIN;
		2216	}
		2217
		2218	--incede;
		2219	}
		2220

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