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Comparing Coro/Coro/State.xs (file contents):
Revision 1.17 by root, Wed Jul 25 14:01:46 2001 UTC vs.
Revision 1.151 by root, Wed Sep 19 21:39:15 2007 UTC

		1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
5	#include "libcoro/coro.c"	9	#include "patchlevel.h"
		10
		11	#include <stdio.h>
		12	#include <errno.h>
		13	#include <assert.h>
6		14
7	#ifdef HAVE_MMAP	15	#ifdef HAVE_MMAP
8	# include <unistd.h>	16	# include <unistd.h>
9	# include <sys/mman.h>	17	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	18	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	19	# ifdef MAP_ANON
		20	# define MAP_ANONYMOUS MAP_ANON
13	# else	21	# else
14	# undef HAVE_MMAP	22	# undef HAVE_MMAP
15	# endif	23	# endif
16	# endif	24	# endif
		25	# include <limits.h>
		26	# ifndef PAGESIZE
		27	# define PAGESIZE pagesize
		28	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		29	static long pagesize;
		30	# else
		31	# define BOOT_PAGESIZE (void)0
17	#endif	32	# 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	33	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	34	# define PAGESIZE 0
		35	# define BOOT_PAGESIZE (void)0
		36	#endif
		37
		38	#if CORO_USE_VALGRIND
		39	# include <valgrind/valgrind.h>
		40	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		41	#else
		42	# define REGISTER_STACK(cctx,start,end)
		43	#endif
		44
		45	/* the maximum number of idle cctx that will be pooled */
		46	#define MAX_IDLE_CCTX 8
		47
		48	#define PERL_VERSION_ATLEAST(a,b,c) \
		49	(PERL_REVISION > (a) \
		50	|| (PERL_REVISION == (a) \
		51	&& (PERL_VERSION > (b) \
		52	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		53
		54	#if !PERL_VERSION_ATLEAST (5,6,0)
		55	# ifndef PL_ppaddr
		56	# define PL_ppaddr ppaddr
31	#endif	57	# endif
		58	# ifndef call_sv
		59	# define call_sv perl_call_sv
		60	# endif
		61	# ifndef get_sv
		62	# define get_sv perl_get_sv
		63	# endif
		64	# ifndef get_cv
		65	# define get_cv perl_get_cv
		66	# endif
		67	# ifndef IS_PADGV
		68	# define IS_PADGV(v) 0
		69	# endif
		70	# ifndef IS_PADCONST
		71	# define IS_PADCONST(v) 0
		72	# endif
		73	#endif
32		74
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	75	/* 5.8.7 */
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	76	#ifndef SvRV_set
		77	# define SvRV_set(s,v) SvRV(s) = (v)
		78	#endif
35		79
36	#define SUB_INIT "Coro::State::initialize"	80	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
37	#define UCORO_STATE "_coro_state"	81	# undef CORO_STACKGUARD
		82	#endif
38		83
		84	#ifndef CORO_STACKGUARD
		85	# define CORO_STACKGUARD 0
		86	#endif
		87
		88	/* prefer perl internal functions over our own? */
		89	#ifndef CORO_PREFER_PERL_FUNCTIONS
		90	# define CORO_PREFER_PERL_FUNCTIONS 0
		91	#endif
		92
39	/* The next macro should delcare a variable stacklevel that contains and approximation	93	/* The next macro should declare a variable stacklevel that contains and approximation
40	* to the current C stack pointer. It's property is that it changes with each call	94	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	95	* and should be unique. */
		96	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	97	#define STACKLEVEL ((void *)&stacklevel)
43		98
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	99	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		100
46	/* this is actually not only the c stack but also c registers etc... */	101	#if __GNUC__ >= 3
		102	# define attribute(x) __attribute__(x)
		103	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		104	#else
		105	# define attribute(x)
		106	# define BARRIER
		107	#endif
		108
		109	#define NOINLINE attribute ((noinline))
		110
		111	#include "CoroAPI.h"
		112
		113	#ifdef USE_ITHREADS
		114	static perl_mutex coro_mutex;
		115	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		116	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		117	#else
		118	# define LOCK (void)0
		119	# define UNLOCK (void)0
		120	#endif
		121
		122	/* helper storage struct for Coro::AIO */
		123	struct io_state
		124	{
		125	int errorno;
		126	I32 laststype;
		127	int laststatval;
		128	Stat_t statcache;
		129	};
		130
		131	static size_t coro_stacksize = CORO_STACKSIZE;
		132	static struct CoroAPI coroapi;
		133	static AV *main_mainstack; /* used to differentiate between $main and others */
		134	static JMPENV *main_top_env;
		135	static HV *coro_state_stash, *coro_stash;
		136	static SV *coro_mortal; /* will be freed after next transfer */
		137
		138	static struct coro_cctx *cctx_first;
		139	static int cctx_count, cctx_idle;
		140
		141	/* this is a structure representing a c-level coroutine */
47	typedef struct {	142	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	143	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		144
		145	/* the stack */
		146	void *sptr;
		147	size_t ssize;
		148
		149	/* cpu state */
		150	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		151	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		152	JMPENV *top_env;
52	coro_context cctx;	153	coro_context cctx;
53		154
54	void *sptr;	155	#if CORO_USE_VALGRIND
55	long ssize; /* positive == mmap, otherwise malloc */	156	int valgrind_id;
56	} coro_stack;	157	#endif
		158	char inuse, mapped;
		159	} coro_cctx;
57		160
58	static coro_stack main_stack = { 1, 0, 0 };	161	enum {
		162	CF_RUNNING = 0x0001, /* coroutine is running */
		163	CF_READY = 0x0002, /* coroutine is ready */
		164	CF_NEW = 0x0004, /* has never been switched to */
		165	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		166	};
59		167
		168	/* this is a structure representing a perl-level coroutine */
60	struct coro {	169	struct coro {
61	/* the optional C context */	170	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	171	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65
66	/* optionally saved, might be zero */
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;
78	SV **stack_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		172
103	/* data associated with this coroutine (initial args) */	173	/* data associated with this coroutine (initial args) */
104	AV *args;	174	AV *args;
		175	int refcnt;
		176	int save; /* CORO_SAVE flags */
		177	int flags; /* CF_ flags */
		178
		179	/* optionally saved, might be zero */
		180	AV *defav; /* @_ */
		181	SV *defsv; /* $_ */
		182	SV *errsv; /* $@ */
		183	GV *deffh; /* default filehandle */
		184	SV *irssv; /* $/ */
		185	SV *irssv_sv; /* real $/ cache */
		186
		187	#define VAR(name,type) type name;
		188	# include "state.h"
		189	#undef VAR
		190
		191	/* coro process data */
		192	int prio;
		193
		194	/* linked list */
		195	struct coro *next, *prev;
		196	HV *hv; /* the perl hash associated with this coro, if any */
105	};	197	};
106		198
107	typedef struct coro *Coro__State;	199	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	200	typedef struct coro *Coro__State_or_hashref;
109		201
110	static AV *main_mainstack; /* used to differentiate between $main and others */	202	/** 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		203
116	/* mostly copied from op.c:cv_clone2 */	204	#define PRIO_MAX 3
117	STATIC AV *	205	#define PRIO_HIGH 1
118	clone_padlist (AV *protopadlist)	206	#define PRIO_NORMAL 0
		207	#define PRIO_LOW -1
		208	#define PRIO_IDLE -3
		209	#define PRIO_MIN -4
		210
		211	/* for Coro.pm */
		212	static SV *coro_current;
		213	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		214	static int coro_nready;
		215	static struct coro *first;
		216
		217	/** lowlevel stuff **********************************************************/
		218
		219	static AV *
		220	coro_clone_padlist (pTHX_ CV *cv)
119	{	221	{
120	AV *av;	222	AV *padlist = CvPADLIST (cv);
121	I32 ix;
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
124	SV **pname = AvARRAY (protopad_name);
125	SV **ppad = AvARRAY (protopad);
126	I32 fname = AvFILLp (protopad_name);
127	I32 fpad = AvFILLp (protopad);
128	AV *newpadlist, *newpad_name, *newpad;	223	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		224
139	newpadlist = newAV ();	225	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	226	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	227	#if PERL_VERSION_ATLEAST (5,9,0)
		228	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		229	#else
		230	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		231	#endif
		232	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		233	--AvFILLp (padlist);
		234
		235	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	236	av_store (newpadlist, 1, (SV *)newpad);
143		237
144	av = newAV (); /* will be @_ */	238	return newpadlist;
145	av_extend (av, 0);	239	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		240
149	for (ix = fpad; ix > 0; ix--)	241	static void
		242	free_padlist (pTHX_ AV *padlist)
		243	{
		244	/* may be during global destruction */
		245	if (SvREFCNT (padlist))
150	{	246	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	247	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	248	while (i >= 0)
153	{	249	{
154	char *name = SvPVX (namesv); /* XXX */	250	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	251	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	252	{
159	else
160	{ /* our own lexical */
161	SV *sv;	253	SV *sv;
162	if (*name == '&')	254	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	255	SvREFCNT_dec (sv);
164	else if (*name == '@')	256
165	sv = (SV *) newAV ();	257	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	}	258	}
174	}	259	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	260
		261	SvREFCNT_dec ((SV*)padlist);
		262	}
		263	}
		264
		265	static int
		266	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		267	{
		268	AV *padlist;
		269	AV *av = (AV *)mg->mg_obj;
		270
		271	/* casting is fun. */
		272	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		273	free_padlist (aTHX_ padlist);
		274
		275	SvREFCNT_dec (av);
		276
		277	return 0;
		278	}
		279
		280	#define PERL_MAGIC_coro PERL_MAGIC_ext
		281
		282	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
		283
		284	#define CORO_MAGIC(cv) \
		285	SvMAGIC (cv) \
		286	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		287	? SvMAGIC (cv) \
		288	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		289	: 0
		290
		291	/* the next two functions merely cache the padlists */
		292	static void
		293	get_padlist (pTHX_ CV *cv)
		294	{
		295	MAGIC *mg = CORO_MAGIC (cv);
		296	AV *av;
		297
		298	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		299	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		300	else
		301	{
		302	#if CORO_PREFER_PERL_FUNCTIONS
		303	/* this is probably cleaner, but also slower? */
		304	CV *cp = Perl_cv_clone (cv);
		305	CvPADLIST (cv) = CvPADLIST (cp);
		306	CvPADLIST (cp) = 0;
		307	SvREFCNT_dec (cp);
		308	#else
		309	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		310	#endif
		311	}
		312	}
		313
		314	static void
		315	put_padlist (pTHX_ CV *cv)
		316	{
		317	MAGIC *mg = CORO_MAGIC (cv);
		318	AV *av;
		319
		320	if (!mg)
		321	{
		322	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		323	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		324	mg->mg_virtual = &vtbl_coro;
		325	mg->mg_obj = (SV *)newAV ();
		326	}
		327
		328	av = (AV *)mg->mg_obj;
		329
		330	if (AvFILLp (av) >= AvMAX (av))
		331	av_extend (av, AvMAX (av) + 1);
		332
		333	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		334	}
		335
		336	/** load & save, init *******************************************************/
		337
		338	#define SB do {
		339	#define SE } while (0)
		340
		341	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
		342
		343	static void
		344	load_perl (pTHX_ Coro__State c)
		345	{
		346	#define VAR(name,type) PL_ ## name = c->name;
		347	# include "state.h"
		348	#undef VAR
		349
		350	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
		351	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
		352	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		353	if (c->deffh) REPLACE_SV (PL_defoutgv , c->deffh);
		354
		355	if (c->irssv)
		356	{
		357	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
176	{	358	{
177	npad[ix] = SvREFCNT_inc (ppad[ix]);	359	SvREFCNT_dec (c->irssv);
		360	c->irssv = 0;
178	}	361	}
179	else	362	else
180	{	363	{
181	SV *sv = NEWSV (0, 0);	364	REPLACE_SV (PL_rs, c->irssv);
182	SvPADTMP_on (sv);	365	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
183	npad[ix] = sv;	366	sv_setsv (c->irssv_sv, PL_rs);
184	}	367	}
185	}	368	}
186
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);
227	}
228	}
229	#endif
230
231	/* the next two functions merely cache the padlists */
232	STATIC void
233	get_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
236
237	if (he && AvFILLp ((AV *)*he) >= 0)
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
239	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	{
250	SvREFCNT_dec (*he);
251	*he = (SV *)newAV ();
252	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282
283	#define SB do {
284	#define SE } while (0)
285
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
290
291	static void
292	load_state(pTHX_ Coro__State c)
293	{
294	PL_dowarn = c->dowarn;
295
296	PL_curstackinfo = c->curstackinfo;
297	PL_curstack = c->curstack;
298	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
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
327		369
328	{	370	{
329	dSP;	371	dSP;
330	CV *cv;	372	CV *cv;
331		373
332	/* now do the ugly restore mess */	374	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	375	while ((cv = (CV *)POPs))
334	{	376	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	377	put_padlist (aTHX_ cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	378	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	379	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	380	}
348		381
349	PUTBACK;	382	PUTBACK;
350	}	383	}
351	}	384	}
352		385
353	static void	386	static void
354	save_state(pTHX_ Coro__State c, int flags)	387	save_perl (pTHX_ Coro__State c)
355	{	388	{
356	{	389	{
357	dSP;	390	dSP;
358	I32 cxix = cxstack_ix;	391	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	392	PERL_CONTEXT *ccstk = cxstack;
…		…
362	/*	395	/*
363	* the worst thing you can imagine happens first - we have to save	396	* the worst thing you can imagine happens first - we have to save
364	* (and reinitialize) all cv's in the whole callchain :(	397	* (and reinitialize) all cv's in the whole callchain :(
365	*/	398	*/
366		399
		400	EXTEND (SP, 3 + 1);
367	PUSHs (Nullsv);	401	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	402	/* this loop was inspired by pp_caller */
369	for (;;)	403	for (;;)
370	{	404	{
371	do	405	while (cxix >= 0)
372	{	406	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	407	PERL_CONTEXT *cx = &ccstk[cxix--];
374		408
375	if (CxTYPE(cx) == CXt_SUB)	409	if (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT)
376	{	410	{
377	CV *cv = cx->blk_sub.cv;	411	CV *cv = cx->blk_sub.cv;
		412
378	if (CvDEPTH(cv))	413	if (CvDEPTH (cv))
379	{	414	{
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);	415	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));	416	PUSHs ((SV *)CvPADLIST (cv));
		417	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	418	PUSHs ((SV *)cv);
396		419
397	get_padlist (cv); /* this is a monster */	420	CvDEPTH (cv) = 0;
		421	get_padlist (aTHX_ cv);
398	}	422	}
399	}	423	}
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	}	424	}
407	while (cxix >= 0);
408		425
409	if (top_si->si_type == PERLSI_MAIN)	426	if (top_si->si_type == PERLSI_MAIN)
410	break;	427	break;
411		428
412	top_si = top_si->si_prev;	429	top_si = top_si->si_prev;
…		…
415	}	432	}
416		433
417	PUTBACK;	434	PUTBACK;
418	}	435	}
419		436
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	437	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	438	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	439	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		440	c->deffh = c->save & CORO_SAVE_DEFFH ? (GV *)SvREFCNT_inc (PL_defoutgv) : 0;
		441	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
423		442
424	/* I have not the slightest idea of why av_reify is necessary */	443	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	444	# include "state.h"
426	if (c->defav)	445	#undef VAR
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;
434	c->stack_sp = PL_stack_sp;
435	c->op = PL_op;
436	c->curpad = PL_curpad;
437	c->stack_base = PL_stack_base;
438	c->stack_max = PL_stack_max;
439	c->tmps_stack = PL_tmps_stack;
440	c->tmps_floor = PL_tmps_floor;
441	c->tmps_ix = PL_tmps_ix;
442	c->tmps_max = PL_tmps_max;
443	c->markstack = PL_markstack;
444	c->markstack_ptr = PL_markstack_ptr;
445	c->markstack_max = PL_markstack_max;
446	c->scopestack = PL_scopestack;
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	}	446	}
459		447
460	/*	448	/*
461	* allocate various perl stacks. This is an exact copy	449	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	450	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	451	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	452	* not usually need a lot of stackspace.
465	*/	453	*/
466	STATIC void	454	#if CORO_PREFER_PERL_FUNCTIONS
		455	# define coro_init_stacks init_stacks
		456	#else
		457	static void
467	coro_init_stacks (pTHX)	458	coro_init_stacks (pTHX)
468	{	459	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	460	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	461	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	462	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	463	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		464
474	PL_stack_base = AvARRAY(PL_curstack);	465	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	466	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	467	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		468
478	New(50,PL_tmps_stack,96,SV*);	469	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	470	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	471	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	472	PL_tmps_max = 128;
482		473
483	New(54,PL_markstack,16,I32);	474	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	475	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	476	PL_markstack_max = PL_markstack + 32;
486		477
		478	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	479	SET_MARK_OFFSET;
		480	#endif
488		481
489	New(54,PL_scopestack,16,I32);	482	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	483	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	484	PL_scopestack_max = 32;
492		485
493	New(54,PL_savestack,96,ANY);	486	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	487	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	488	PL_savestack_max = 64;
496		489
		490	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	491	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	492	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	493	PL_retstack_max = 16;
		494	#endif
500	}	495	}
		496	#endif
501		497
502	/*	498	/*
503	* destroy the stacks, the callchain etc...	499	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	500	*/
506	STATIC void	501	static void
507	destroy_stacks(pTHX)	502	coro_destroy_stacks (pTHX)
508	{	503	{
509	/* is this ugly, I ask? */	504	if (!IN_DESTRUCT)
510	while (PL_scopestack_ix)	505	{
511	LEAVE;	506	/* restore all saved variables and stuff */
		507	LEAVE_SCOPE (0);
		508	assert (PL_tmps_floor == -1);
512		509
513	/* sure it is, but more important: is it correct?? :/ */	510	/* free all temporaries */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;	511	FREETMPS;
		512	assert (PL_tmps_ix == -1);
		513
		514	/* unwind all extra stacks */
		515	POPSTACK_TO (PL_mainstack);
		516
		517	/* unwind main stack */
		518	dounwind (-1);
		519	}
516		520
517	while (PL_curstackinfo->si_next)	521	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	522	PL_curstackinfo = PL_curstackinfo->si_next;
519		523
520	while (PL_curstackinfo)	524	while (PL_curstackinfo)
521	{	525	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	526	PERL_SI *p = PL_curstackinfo->si_prev;
523		527
524	{	528	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);	529	SvREFCNT_dec (PL_curstackinfo->si_stack);
		530
533	Safefree(PL_curstackinfo->si_cxstack);	531	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	532	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	533	PL_curstackinfo = p;
536	}	534	}
537		535
538	Safefree(PL_tmps_stack);	536	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	537	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	538	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	539	Safefree (PL_savestack);
		540	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	541	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 for us */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif	542	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}	543	}
573		544
574	static void	545	/** coroutine stack handling ************************************************/
575	deallocate_stack (Coro__State ctx)
576	{
577	coro_stack *stack = ctx->stack;
578		546
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void	547	static void
600	setup_coro (void *arg)	548	setup_coro (pTHX_ struct coro *coro)
601	{	549	{
602	/*	550	/*
603	* emulate part of the perl startup here.	551	* emulate part of the perl startup here.
604	*/	552	*/
		553	coro_init_stacks (aTHX);
		554
		555	PL_curcop = &PL_compiling;
		556	PL_in_eval = EVAL_NULL;
		557	PL_comppad = 0;
		558	PL_curpm = 0;
		559	PL_localizing = 0;
		560	PL_dirty = 0;
		561	PL_restartop = 0;
		562
		563	{
		564	dSP;
		565	LOGOP myop;
		566
		567	SvREFCNT_dec (GvAV (PL_defgv));
		568	GvAV (PL_defgv) = coro->args; coro->args = 0;
		569
		570	Zero (&myop, 1, LOGOP);
		571	myop.op_next = Nullop;
		572	myop.op_flags = OPf_WANT_VOID;
		573
		574	PUSHMARK (SP);
		575	XPUSHs (av_shift (GvAV (PL_defgv)));
		576	PUTBACK;
		577	PL_op = (OP *)&myop;
		578	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		579	SPAGAIN;
		580	}
		581
		582	ENTER; /* necessary e.g. for dounwind */
		583	}
		584
		585	static void
		586	free_coro_mortal (pTHX)
		587	{
		588	if (coro_mortal)
		589	{
		590	SvREFCNT_dec (coro_mortal);
		591	coro_mortal = 0;
		592	}
		593	}
		594
		595	/* inject a fake call to Coro::State::_cctx_init into the execution */
		596	/* _cctx_init should be careful, as it could be called at almost any time */
		597	/* during execution of a perl program */
		598	static void NOINLINE
		599	prepare_cctx (pTHX_ coro_cctx *cctx)
		600	{
605	dSP;	601	dSP;
606	Coro__State ctx = (Coro__State)arg;	602	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		603
609	coro_init_stacks (aTHX);	604	Zero (&myop, 1, LOGOP);
610	JMPENV_BOOTSTRAP;	605	myop.op_next = PL_op;
		606	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		607
		608	PUSHMARK (SP);
		609	EXTEND (SP, 2);
		610	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		611	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		612	PUTBACK;
		613	PL_op = (OP *)&myop;
		614	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	615	SPAGAIN;
		616	}
612		617
613	/*PL_curcop = 0;*/	618	/*
614	SvREFCNT_dec (GvAV (PL_defgv));	619	* this is a _very_ stripped down perl interpreter ;)
615	GvAV (PL_defgv) = ctx->args;	620	*/
		621	static void
		622	coro_run (void *arg)
		623	{
		624	dTHX;
616		625
617	if (ctx->stack)	626	/* coro_run is the alternative tail of transfer(), so unlock here. */
618	{	627	UNLOCK;
619	ctx->cursp = 0;
620		628
621	PUSHMARK(SP);	629	PL_top_env = &PL_start_env;
622	PUTBACK;	630
623	(void) call_sv (sub_init, G_VOID|G_NOARGS);	631	/* inject a fake subroutine call to cctx_init */
624	croak ("FATAL: CCTXT coroutine returned!");	632	prepare_cctx (aTHX_ (coro_cctx *)arg);
		633
		634	/* somebody or something will hit me for both perl_run and PL_restartop */
		635	PL_restartop = PL_op;
		636	perl_run (PL_curinterp);
		637
		638	/*
		639	* If perl-run returns we assume exit() was being called or the coro
		640	* fell off the end, which seems to be the only valid (non-bug)
		641	* reason for perl_run to return. We try to exit by jumping to the
		642	* bootstrap-time "top" top_env, as we cannot restore the "main"
		643	* coroutine as Coro has no such concept
		644	*/
		645	PL_top_env = main_top_env;
		646	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		647	}
		648
		649	static coro_cctx *
		650	cctx_new ()
		651	{
		652	coro_cctx *cctx;
		653	void *stack_start;
		654	size_t stack_size;
		655
		656	++cctx_count;
		657
		658	Newz (0, cctx, 1, coro_cctx);
		659
		660	#if HAVE_MMAP
		661
		662	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		663	/* mmap supposedly does allocate-on-write for us */
		664	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		665
		666	if (cctx->sptr != (void *)-1)
		667	{
		668	# if CORO_STACKGUARD
		669	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		670	# endif
		671	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		672	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		673	cctx->mapped = 1;
625	}	674	}
626	else	675	else
627	{	676	#endif
628	UNOP myop;
629
630	PL_op = (OP *)&myop;
631
632	Zero(&myop, 1, UNOP);
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	}	677	{
651	}	678	cctx->ssize = coro_stacksize * (long)sizeof (long);
		679	New (0, cctx->sptr, coro_stacksize, long);
652		680
653	static void	681	if (!cctx->sptr)
654	continue_coro (void *arg)	682	{
655	{	683	perror ("FATAL: unable to allocate stack for coroutine");
656	/*	684	_exit (EXIT_FAILURE);
657	* this is a _very_ stripped down perl interpreter ;)	685	}
658	*/
659	Coro__State ctx = (Coro__State)arg;
660		686
661	ctx->cursp = 0;	687	stack_start = cctx->sptr;
		688	stack_size = cctx->ssize;
		689	}
		690
		691	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		692	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
		693
		694	return cctx;
		695	}
		696
		697	static void
		698	cctx_destroy (coro_cctx *cctx)
		699	{
		700	if (!cctx)
		701	return;
		702
		703	--cctx_count;
		704
		705	#if CORO_USE_VALGRIND
		706	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		707	#endif
		708
		709	#if HAVE_MMAP
		710	if (cctx->mapped)
		711	munmap (cctx->sptr, cctx->ssize);
		712	else
		713	#endif
		714	Safefree (cctx->sptr);
		715
		716	Safefree (cctx);
		717	}
		718
		719	static coro_cctx *
		720	cctx_get (pTHX)
		721	{
		722	while (cctx_first)
		723	{
		724	coro_cctx *cctx = cctx_first;
		725	cctx_first = cctx->next;
		726	--cctx_idle;
		727
		728	if (cctx->ssize >= coro_stacksize)
		729	return cctx;
		730
		731	cctx_destroy (cctx);
		732	}
		733
662	PL_op = PL_op->op_next;	734	PL_op = PL_op->op_next;
663	CALLRUNOPS(aTHX);	735	return cctx_new ();
664	/*NORETURN*/
665	abort ();
666	}	736	}
667		737
668	STATIC void	738	static void
		739	cctx_put (coro_cctx *cctx)
		740	{
		741	/* free another cctx if overlimit */
		742	if (cctx_idle >= MAX_IDLE_CCTX)
		743	{
		744	coro_cctx *first = cctx_first;
		745	cctx_first = first->next;
		746	--cctx_idle;
		747
		748	assert (!first->inuse);
		749	cctx_destroy (first);
		750	}
		751
		752	++cctx_idle;
		753	cctx->next = cctx_first;
		754	cctx_first = cctx;
		755	}
		756
		757	/** coroutine switching *****************************************************/
		758
		759	/* never call directly, always through the coro_state_transfer global variable */
		760	static void NOINLINE
669	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	761	transfer (pTHX_ struct coro *prev, struct coro *next)
670	{	762	{
671	dSP;
672	dSTACKLEVEL;	763	dSTACKLEVEL;
673		764
		765	/* sometimes transfer is only called to set idle_sp */
		766	if (!next)
		767	{
		768	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		769	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		770	}
674	if (prev != next)	771	else if (prev != next)
675	{	772	{
676	if (next->mainstack)	773	coro_cctx *prev__cctx;
		774
		775	if (prev->flags & CF_NEW)
677	{	776	{
678	SAVE (prev, flags);	777	/* create a new empty context */
679	LOAD (next);	778	Newz (0, prev->cctx, 1, coro_cctx);
680		779	prev->cctx->inuse = 1;
681	/* mark this state as in-use */	780	prev->flags &= ~CF_NEW;
682	next->mainstack = 0;	781	prev->flags |= CF_RUNNING;
683	next->tmps_ix = -2;
684
685	/* stacklevel changed? if yes, grab the stack for us! */
686	if (flags & TRANSFER_SAVE_CCTXT)
687	{
688	if (!prev->stack)
689	allocate_stack (prev, 0);
690	else if (prev->cursp != stacklevel
691	&& prev->stack->usecnt > 1)
692	{
693	prev->gencnt = ++prev->stack->gencnt;
694	prev->stack->usecnt = 1;
695	}
696
697	/* has our stack been invalidated? */
698	if (next->stack && next->stack->gencnt != next->gencnt)
699	{
700	deallocate_stack (next);
701	allocate_stack (next, 1);
702	coro_create (&(next->stack->cctx),
703	continue_coro, (void *)next,
704	next->stack->sptr, labs (next->stack->ssize));
705	}
706
707	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
708	}
709
710	}	782	}
711	else if (next->tmps_ix == -2)	783
712	croak ("tried to transfer to running coroutine");	784	/*TODO: must not croak here */
		785	if (!prev->flags & CF_RUNNING)
		786	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		787
		788	if (next->flags & CF_RUNNING)
		789	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		790
		791	if (next->flags & CF_DESTROYED)
		792	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		793
		794	prev->flags &= ~CF_RUNNING;
		795	next->flags |= CF_RUNNING;
		796
		797	LOCK;
		798
		799	if (next->flags & CF_NEW)
		800	{
		801	/* need to start coroutine */
		802	next->flags &= ~CF_NEW;
		803	/* first get rid of the old state */
		804	save_perl (aTHX_ prev);
		805	/* setup coroutine call */
		806	setup_coro (aTHX_ next);
		807	/* need a new stack */
		808	assert (!next->cctx);
		809	}
713	else	810	else
714	{	811	{
715	SAVE (prev, -1); /* first get rid of the old state */	812	/* coroutine already started */
716		813	save_perl (aTHX_ prev);
717	if (flags & TRANSFER_SAVE_CCTXT)	814	load_perl (aTHX_ next);
718	{
719	if (!prev->stack)
720	allocate_stack (prev, 0);
721
722	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
723	{
724	setup_coro (next);
725
726	prev->stack->refcnt++;
727	prev->stack->usecnt++;
728	next->stack = prev->stack;
729	next->gencnt = prev->gencnt;
730	}
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	}
739	}
740	else
741	setup_coro (next);
742	}	815	}
		816
		817	prev__cctx = prev->cctx;
		818
		819	/* possibly "free" the cctx */
		820	if (prev__cctx->idle_sp == STACKLEVEL)
		821	{
		822	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		823	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		824
		825	prev->cctx = 0;
		826
		827	cctx_put (prev__cctx);
		828	prev__cctx->inuse = 0;
		829	}
		830
		831	if (!next->cctx)
		832	{
		833	next->cctx = cctx_get (aTHX);
		834	assert (!next->cctx->inuse);
		835	next->cctx->inuse = 1;
		836	}
		837
		838	if (prev__cctx != next->cctx)
		839	{
		840	prev__cctx->top_env = PL_top_env;
		841	PL_top_env = next->cctx->top_env;
		842	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		843	}
		844
		845	free_coro_mortal (aTHX);
		846	UNLOCK;
		847	}
		848	}
		849
		850	struct transfer_args
		851	{
		852	struct coro *prev, *next;
		853	};
		854
		855	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		856
		857	/** high level stuff ********************************************************/
		858
		859	static int
		860	coro_state_destroy (pTHX_ struct coro *coro)
		861	{
		862	if (coro->flags & CF_DESTROYED)
		863	return 0;
		864
		865	coro->flags |= CF_DESTROYED;
		866
		867	if (coro->flags & CF_READY)
743	}	868	{
		869	/* reduce nready, as destroying a ready coro effectively unreadies it */
		870	/* alternative: look through all ready queues and remove the coro */
		871	LOCK;
		872	--coro_nready;
		873	UNLOCK;
		874	}
		875	else
		876	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
744		877
745	next->cursp = stacklevel;	878	if (coro->mainstack && coro->mainstack != main_mainstack)
		879	{
		880	struct coro temp;
		881
		882	assert (!(coro->flags & CF_RUNNING));
		883
		884	Zero (&temp, 1, struct coro);
		885	temp.save = CORO_SAVE_ALL;
		886
		887	if (coro->flags & CF_RUNNING)
		888	croak ("FATAL: tried to destroy currently running coroutine");
		889
		890	save_perl (aTHX_ &temp);
		891	load_perl (aTHX_ coro);
		892
		893	coro_destroy_stacks (aTHX);
		894
		895	load_perl (aTHX_ &temp); /* this will get rid of defsv etc.. */
		896
		897	coro->mainstack = 0;
		898	}
		899
		900	cctx_destroy (coro->cctx);
		901	SvREFCNT_dec (coro->args);
		902
		903	if (coro->next) coro->next->prev = coro->prev;
		904	if (coro->prev) coro->prev->next = coro->next;
		905	if (coro == first) first = coro->next;
		906
		907	return 1;
		908	}
		909
		910	static int
		911	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		912	{
		913	struct coro *coro = (struct coro *)mg->mg_ptr;
		914	mg->mg_ptr = 0;
		915
		916	coro->hv = 0;
		917
		918	if (--coro->refcnt < 0)
		919	{
		920	coro_state_destroy (aTHX_ coro);
		921	Safefree (coro);
		922	}
		923
		924	return 0;
		925	}
		926
		927	static int
		928	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		929	{
		930	struct coro *coro = (struct coro *)mg->mg_ptr;
		931
		932	++coro->refcnt;
		933
		934	return 0;
		935	}
		936
		937	static MGVTBL coro_state_vtbl = {
		938	0, 0, 0, 0,
		939	coro_state_free,
		940	0,
		941	#ifdef MGf_DUP
		942	coro_state_dup,
		943	#else
		944	# define MGf_DUP 0
		945	#endif
		946	};
		947
		948	static struct coro *
		949	SvSTATE_ (pTHX_ SV *coro)
		950	{
		951	HV *stash;
		952	MAGIC *mg;
		953
		954	if (SvROK (coro))
		955	coro = SvRV (coro);
		956
		957	stash = SvSTASH (coro);
		958	if (stash != coro_stash && stash != coro_state_stash)
		959	{
		960	/* very slow, but rare, check */
		961	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		962	croak ("Coro::State object required");
		963	}
		964
		965	mg = CORO_MAGIC (coro);
		966	return (struct coro *)mg->mg_ptr;
		967	}
		968
		969	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		970
		971	static void
		972	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		973	{
		974	ta->prev = SvSTATE (prev_sv);
		975	ta->next = SvSTATE (next_sv);
		976	}
		977
		978	static void
		979	api_transfer (SV *prev_sv, SV *next_sv)
		980	{
		981	dTHX;
		982	struct transfer_args ta;
		983
		984	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		985	TRANSFER (ta);
		986	}
		987
		988	static int
		989	api_save (SV *coro_sv, int new_save)
		990	{
		991	dTHX;
		992	struct coro *coro = SvSTATE (coro_sv);
		993	int old_save = coro->save;
		994
		995	if (new_save >= 0)
		996	coro->save = new_save;
		997
		998	return old_save;
		999	}
		1000
		1001	/** Coro ********************************************************************/
		1002
		1003	static void
		1004	coro_enq (pTHX_ SV *coro_sv)
		1005	{
		1006	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		1007	}
		1008
		1009	static SV *
		1010	coro_deq (pTHX_ int min_prio)
		1011	{
		1012	int prio = PRIO_MAX - PRIO_MIN;
		1013
		1014	min_prio -= PRIO_MIN;
		1015	if (min_prio < 0)
		1016	min_prio = 0;
		1017
		1018	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		1019	if (AvFILLp (coro_ready [prio]) >= 0)
		1020	return av_shift (coro_ready [prio]);
		1021
		1022	return 0;
		1023	}
		1024
		1025	static int
		1026	api_ready (SV *coro_sv)
		1027	{
		1028	dTHX;
		1029	struct coro *coro;
		1030
		1031	if (SvROK (coro_sv))
		1032	coro_sv = SvRV (coro_sv);
		1033
		1034	coro = SvSTATE (coro_sv);
		1035
		1036	if (coro->flags & CF_READY)
		1037	return 0;
		1038
		1039	coro->flags |= CF_READY;
		1040
		1041	LOCK;
		1042	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1043	++coro_nready;
		1044	UNLOCK;
		1045
		1046	return 1;
		1047	}
		1048
		1049	static int
		1050	api_is_ready (SV *coro_sv)
		1051	{
		1052	dTHX;
		1053	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1054	}
		1055
		1056	static void
		1057	prepare_schedule (pTHX_ struct transfer_args *ta)
		1058	{
		1059	SV *prev_sv, *next_sv;
		1060
		1061	for (;;)
		1062	{
		1063	LOCK;
		1064	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1065
		1066	/* nothing to schedule: call the idle handler */
		1067	if (!next_sv)
		1068	{
		1069	dSP;
		1070	UNLOCK;
		1071
		1072	ENTER;
		1073	SAVETMPS;
		1074
		1075	PUSHMARK (SP);
		1076	PUTBACK;
		1077	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1078
		1079	FREETMPS;
		1080	LEAVE;
		1081	continue;
		1082	}
		1083
		1084	ta->next = SvSTATE (next_sv);
		1085
		1086	/* cannot transfer to destroyed coros, skip and look for next */
		1087	if (ta->next->flags & CF_DESTROYED)
		1088	{
		1089	UNLOCK;
		1090	SvREFCNT_dec (next_sv);
		1091	/* coro_nready is already taken care of by destroy */
		1092	continue;
		1093	}
		1094
		1095	--coro_nready;
		1096	UNLOCK;
		1097	break;
		1098	}
		1099
		1100	/* free this only after the transfer */
		1101	prev_sv = SvRV (coro_current);
		1102	SvRV_set (coro_current, next_sv);
		1103	ta->prev = SvSTATE (prev_sv);
		1104
		1105	assert (ta->next->flags & CF_READY);
		1106	ta->next->flags &= ~CF_READY;
		1107
		1108	LOCK;
		1109	free_coro_mortal (aTHX);
		1110	coro_mortal = prev_sv;
		1111	UNLOCK;
		1112	}
		1113
		1114	static void
		1115	prepare_cede (pTHX_ struct transfer_args *ta)
		1116	{
		1117	api_ready (coro_current);
		1118	prepare_schedule (aTHX_ ta);
		1119	}
		1120
		1121	static int
		1122	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1123	{
		1124	if (coro_nready)
		1125	{
		1126	SV *prev = SvRV (coro_current);
		1127	prepare_schedule (aTHX_ ta);
		1128	api_ready (prev);
		1129	return 1;
		1130	}
		1131	else
		1132	return 0;
		1133	}
		1134
		1135	static void
		1136	api_schedule (void)
		1137	{
		1138	dTHX;
		1139	struct transfer_args ta;
		1140
		1141	prepare_schedule (aTHX_ &ta);
		1142	TRANSFER (ta);
		1143	}
		1144
		1145	static int
		1146	api_cede (void)
		1147	{
		1148	dTHX;
		1149	struct transfer_args ta;
		1150
		1151	prepare_cede (aTHX_ &ta);
		1152
		1153	if (ta.prev != ta.next)
		1154	{
		1155	TRANSFER (ta);
		1156	return 1;
		1157	}
		1158	else
		1159	return 0;
		1160	}
		1161
		1162	static int
		1163	api_cede_notself (void)
		1164	{
		1165	dTHX;
		1166	struct transfer_args ta;
		1167
		1168	if (prepare_cede_notself (aTHX_ &ta))
		1169	{
		1170	TRANSFER (ta);
		1171	return 1;
		1172	}
		1173	else
		1174	return 0;
746	}	1175	}
747		1176
748	MODULE = Coro::State PACKAGE = Coro::State	1177	MODULE = Coro::State PACKAGE = Coro::State
749		1178
750	PROTOTYPES: ENABLE	1179	PROTOTYPES: DISABLE
751		1180
752	BOOT:	1181	BOOT:
753	{ /* {} necessary for stoopid perl-5.6.x */	1182	{
754	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1183	#ifdef USE_ITHREADS
755	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1184	MUTEX_INIT (&coro_mutex);
		1185	#endif
		1186	BOOT_PAGESIZE;
		1187
756	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1188	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
757		1189
758	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1190	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
759	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1191	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
760	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1192	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1193	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1194	newCONSTSUB (coro_state_stash, "SAVE_DEFFH", newSViv (CORO_SAVE_DEFFH));
761	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1195	newCONSTSUB (coro_state_stash, "SAVE_DEF", newSViv (CORO_SAVE_DEF));
762		1196	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
763	if (!padlist_cache)
764	padlist_cache = newHV ();
765		1197
766	main_mainstack = PL_mainstack;	1198	main_mainstack = PL_mainstack;
767	}	1199	main_top_env = PL_top_env;
768		1200
769	Coro::State	1201	while (main_top_env->je_prev)
770	_newprocess(args)	1202	main_top_env = main_top_env->je_prev;
771	SV * args	1203
772	PROTOTYPE: $	1204	coroapi.ver = CORO_API_VERSION;
		1205	coroapi.transfer = api_transfer;
		1206
		1207	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1208	}
		1209
		1210	SV *
		1211	new (char *klass, ...)
773	CODE:	1212	CODE:
774	Coro__State coro;	1213	{
		1214	struct coro *coro;
		1215	HV *hv;
		1216	int i;
775		1217
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);	1218	Newz (0, coro, 1, struct coro);
		1219	coro->args = newAV ();
		1220	coro->save = CORO_SAVE_DEF;
		1221	coro->flags = CF_NEW;
780		1222
781	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1223	if (first) first->prev = coro;
782	coro->mainstack = 0; /* actual work is done inside transfer */	1224	coro->next = first;
783	coro->stack = 0;	1225	first = coro;
784		1226
785	RETVAL = coro;	1227	coro->hv = hv = newHV ();
		1228	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1229	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1230
		1231	for (i = 1; i < items; i++)
		1232	av_push (coro->args, newSVsv (ST (i)));
		1233	}
786	OUTPUT:	1234	OUTPUT:
787	RETVAL	1235	RETVAL
788		1236
		1237	int
		1238	save (SV *coro, int new_save = -1)
		1239	CODE:
		1240	RETVAL = api_save (coro, new_save);
		1241	OUTPUT:
		1242	RETVAL
		1243
		1244	int
		1245	save_also (SV *coro_sv, int save_also)
		1246	CODE:
		1247	{
		1248	struct coro *coro = SvSTATE (coro_sv);
		1249	RETVAL = coro->save;
		1250	coro->save |= save_also;
		1251	}
		1252	OUTPUT:
		1253	RETVAL
		1254
789	void	1255	void
790	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1256	_set_stacklevel (...)
791	Coro::State_or_hashref prev	1257	ALIAS:
792	Coro::State_or_hashref next	1258	Coro::State::transfer = 1
793	int flags	1259	Coro::schedule = 2
794	PROTOTYPE: @	1260	Coro::cede = 3
		1261	Coro::cede_notself = 4
795	CODE:	1262	CODE:
796	transfer (aTHX_ prev, next, flags);	1263	{
		1264	struct transfer_args ta;
		1265
		1266	switch (ix)
		1267	{
		1268	case 0:
		1269	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1270	ta.next = 0;
		1271	break;
		1272
		1273	case 1:
		1274	if (items != 2)
		1275	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1276
		1277	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1278	break;
		1279
		1280	case 2:
		1281	prepare_schedule (aTHX_ &ta);
		1282	break;
		1283
		1284	case 3:
		1285	prepare_cede (aTHX_ &ta);
		1286	break;
		1287
		1288	case 4:
		1289	if (!prepare_cede_notself (aTHX_ &ta))
		1290	XSRETURN_EMPTY;
		1291
		1292	break;
		1293	}
		1294
		1295	BARRIER;
		1296	TRANSFER (ta);
		1297
		1298	if (GIMME_V != G_VOID && ta.next != ta.prev)
		1299	XSRETURN_YES;
		1300	}
		1301
		1302	bool
		1303	_destroy (SV *coro_sv)
		1304	CODE:
		1305	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1306	OUTPUT:
		1307	RETVAL
797		1308
798	void	1309	void
799	DESTROY(coro)	1310	_exit (code)
800	Coro::State coro	1311	int code
801	CODE:	1312	PROTOTYPE: $
		1313	CODE:
		1314	_exit (code);
802		1315
803	if (coro->mainstack && coro->mainstack != main_mainstack)	1316	int
		1317	cctx_stacksize (int new_stacksize = 0)
		1318	CODE:
		1319	RETVAL = coro_stacksize;
		1320	if (new_stacksize)
		1321	coro_stacksize = new_stacksize;
		1322	OUTPUT:
		1323	RETVAL
		1324
		1325	int
		1326	cctx_count ()
		1327	CODE:
		1328	RETVAL = cctx_count;
		1329	OUTPUT:
		1330	RETVAL
		1331
		1332	int
		1333	cctx_idle ()
		1334	CODE:
		1335	RETVAL = cctx_idle;
		1336	OUTPUT:
		1337	RETVAL
		1338
		1339	void
		1340	list ()
		1341	PPCODE:
		1342	{
		1343	struct coro *coro;
		1344	for (coro = first; coro; coro = coro->next)
		1345	if (coro->hv)
		1346	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1347	}
		1348
		1349	void
		1350	_eval (SV *coro_sv, SV *coderef)
		1351	CODE:
		1352	{
		1353	struct coro *coro = SvSTATE (coro_sv);
		1354	if (coro->mainstack)
804	{	1355	{
805	struct coro temp;	1356	struct coro temp;
		1357	Zero (&temp, 1, struct coro);
		1358	temp.save = CORO_SAVE_ALL;
806		1359
807	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1360	if (!(coro->flags & CF_RUNNING))
808	LOAD(aTHX_ coro);	1361	{
		1362	save_perl (aTHX_ &temp);
		1363	load_perl (aTHX_ coro);
		1364	}
809		1365
810	destroy_stacks (aTHX);	1366	{
		1367	dSP;
		1368	ENTER;
		1369	SAVETMPS;
		1370	PUSHMARK (SP);
		1371	PUTBACK;
		1372	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1373	SPAGAIN;
		1374	FREETMPS;
		1375	LEAVE;
		1376	PUTBACK;
		1377	}
811		1378
812	LOAD((&temp)); /* this will get rid of defsv etc.. */	1379	if (!(coro->flags & CF_RUNNING))
813		1380	{
814	coro->mainstack = 0;	1381	save_perl (aTHX_ coro);
		1382	load_perl (aTHX_ &temp);
		1383	}
815	}	1384	}
		1385	}
		1386
		1387	SV *
		1388	is_ready (SV *coro_sv)
		1389	PROTOTYPE: $
		1390	ALIAS:
		1391	is_ready = CF_READY
		1392	is_running = CF_RUNNING
		1393	is_new = CF_NEW
		1394	is_destroyed = CF_DESTROYED
		1395	CODE:
		1396	struct coro *coro = SvSTATE (coro_sv);
		1397	RETVAL = boolSV (coro->flags & ix);
		1398	OUTPUT:
		1399	RETVAL
816		1400
817	deallocate_stack (coro);
818		1401
819	Safefree (coro);	1402	MODULE = Coro::State PACKAGE = Coro
		1403
		1404	BOOT:
		1405	{
		1406	int i;
		1407
		1408	coro_stash = gv_stashpv ("Coro", TRUE);
		1409
		1410	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1411	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1412	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1413	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1414	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1415	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1416
		1417	coro_current = get_sv ("Coro::current", FALSE);
		1418	SvREADONLY_on (coro_current);
		1419
		1420	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1421	coro_ready[i] = newAV ();
		1422
		1423	{
		1424	SV *sv = perl_get_sv("Coro::API", 1);
		1425
		1426	coroapi.schedule = api_schedule;
		1427	coroapi.save = api_save;
		1428	coroapi.cede = api_cede;
		1429	coroapi.cede_notself = api_cede_notself;
		1430	coroapi.ready = api_ready;
		1431	coroapi.is_ready = api_is_ready;
		1432	coroapi.nready = &coro_nready;
		1433	coroapi.current = coro_current;
		1434
		1435	GCoroAPI = &coroapi;
		1436	sv_setiv (sv, (IV)&coroapi);
		1437	SvREADONLY_on (sv);
		1438	}
		1439	}
820		1440
821	void	1441	void
822	flush()	1442	_set_current (SV *current)
		1443	PROTOTYPE: $
823	CODE:	1444	CODE:
824	#ifdef MAY_FLUSH	1445	SvREFCNT_dec (SvRV (coro_current));
825	flush_padlist_cache ();	1446	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
826	#endif
827		1447
		1448	int
		1449	prio (Coro::State coro, int newprio = 0)
		1450	ALIAS:
		1451	nice = 1
		1452	CODE:
		1453	{
		1454	RETVAL = coro->prio;
		1455
		1456	if (items > 1)
		1457	{
		1458	if (ix)
		1459	newprio = coro->prio - newprio;
		1460
		1461	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1462	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1463
		1464	coro->prio = newprio;
		1465	}
		1466	}
		1467	OUTPUT:
		1468	RETVAL
		1469
		1470	SV *
		1471	ready (SV *self)
		1472	PROTOTYPE: $
		1473	CODE:
		1474	RETVAL = boolSV (api_ready (self));
		1475	OUTPUT:
		1476	RETVAL
		1477
		1478	int
		1479	nready (...)
		1480	PROTOTYPE:
		1481	CODE:
		1482	RETVAL = coro_nready;
		1483	OUTPUT:
		1484	RETVAL
		1485
828	MODULE = Coro::State PACKAGE = Coro::Cont	1486	MODULE = Coro::State PACKAGE = Coro::AIO
829		1487
830	# this is slightly dirty	1488	SV *
		1489	_get_state ()
		1490	CODE:
		1491	{
		1492	struct io_state *data;
		1493
		1494	RETVAL = newSV (sizeof (struct io_state));
		1495	data = (struct io_state *)SvPVX (RETVAL);
		1496	SvCUR_set (RETVAL, sizeof (struct io_state));
		1497	SvPOK_only (RETVAL);
		1498
		1499	data->errorno = errno;
		1500	data->laststype = PL_laststype;
		1501	data->laststatval = PL_laststatval;
		1502	data->statcache = PL_statcache;
		1503	}
		1504	OUTPUT:
		1505	RETVAL
831		1506
832	void	1507	void
833	yield(...)	1508	_set_state (char *data_)
834	PROTOTYPE: @	1509	PROTOTYPE: $
835	CODE:	1510	CODE:
836	static SV *returnstk;	1511	{
837	SV *sv;	1512	struct io_state *data = (void *)data_;
838	AV *defav = GvAV (PL_defgv);
839	struct coro *prev, *next;
840		1513
841	if (!returnstk)	1514	errno = data->errorno;
842	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1515	PL_laststype = data->laststype;
		1516	PL_laststatval = data->laststatval;
		1517	PL_statcache = data->statcache;
		1518	}
843		1519
844	/* set up @_ -- ugly */
845	av_clear (defav);
846	av_fill (defav, items - 1);
847	while (items--)
848	av_store (defav, items, SvREFCNT_inc (ST(items)));
849
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);
855
856	transfer(aTHX_ prev, next, 0);
857

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