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Comparing Coro/Coro/State.xs (file contents):
Revision 1.16 by root, Wed Jul 25 04:26:55 2001 UTC vs.
Revision 1.214 by root, Sat Oct 13 23:19:10 2007 UTC

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

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