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Comparing Coro/Coro/State.xs (file contents):
Revision 1.14 by root, Mon Jul 23 23:48:05 2001 UTC vs.
Revision 1.231 by root, Thu Apr 24 10:31:59 2008 UTC

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

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