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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.19 by root, Sun Jul 29 01:11:41 2001 UTC vs.
Revision 1.124 by root, Tue Dec 5 12:50:04 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
		23	# ifndef PL_ppaddr
		24	# define PL_ppaddr ppaddr
		25	# endif
		26	# ifndef call_sv
		27	# define call_sv perl_call_sv
		28	# endif
		29	# ifndef get_sv
		30	# define get_sv perl_get_sv
		31	# endif
		32	# ifndef get_cv
		33	# define get_cv perl_get_cv
		34	# endif
		35	# ifndef IS_PADGV
		36	# define IS_PADGV(v) 0
		37	# endif
		38	# ifndef IS_PADCONST
		39	# define IS_PADCONST(v) 0
		40	# endif
		41	#endif
		42
		43	#include <stdio.h>
		44	#include <errno.h>
		45	#include <assert.h>
		46
		47	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		48	# undef STACKGUARD
		49	#endif
		50
		51	#ifndef STACKGUARD
		52	# define STACKGUARD 0
		53	#endif
6		54
7	#ifdef HAVE_MMAP	55	#ifdef HAVE_MMAP
8	# include <unistd.h>	56	# include <unistd.h>
9	# include <sys/mman.h>	57	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	58	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	59	# ifdef MAP_ANON
		60	# define MAP_ANONYMOUS MAP_ANON
13	# else	61	# else
14	# undef HAVE_MMAP	62	# undef HAVE_MMAP
15	# endif	63	# endif
16	# endif	64	# endif
		65	# include <limits.h>
		66	# ifndef PAGESIZE
		67	# define PAGESIZE pagesize
		68	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		69	static long pagesize;
		70	# else
		71	# define BOOT_PAGESIZE (void)0
17	#endif	72	# 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	73	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	74	# define PAGESIZE 0
		75	# define BOOT_PAGESIZE (void)0
31	#endif	76	#endif
32		77
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
35
36	#define SUB_INIT "Coro::State::initialize"
37	#define UCORO_STATE "_coro_state"
38
39	/* The next macro should delcare a variable stacklevel that contains and approximation	78	/* 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	79	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	80	* and should be unique. */
		81	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	82	#define STACKLEVEL ((void *)&stacklevel)
43		83
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	84	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		85
46	/* this is actually not only the c stack but also c registers etc... */	86	#if __GNUC__ >= 3
		87	# define attribute(x) __attribute__(x)
		88	#else
		89	# define attribute(x)
		90	#endif
		91
		92	#define NOINLINE attribute ((noinline))
		93
		94	#include "CoroAPI.h"
		95
		96	#ifdef USE_ITHREADS
		97	static perl_mutex coro_mutex;
		98	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		99	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		100	#else
		101	# define LOCK (void)0
		102	# define UNLOCK (void)0
		103	#endif
		104
		105	struct io_state
		106	{
		107	int errorno;
		108	I32 laststype;
		109	int laststatval;
		110	Stat_t statcache;
		111	};
		112
		113	static struct CoroAPI coroapi;
		114	static AV *main_mainstack; /* used to differentiate between $main and others */
		115	static HV *coro_state_stash, *coro_stash;
		116	static SV *coro_mortal; /* will be freed after next transfer */
		117
		118	static struct coro_cctx *cctx_first;
		119	static int cctx_count, cctx_idle;
		120
		121	/* this is a structure representing a c-level coroutine */
47	typedef struct {	122	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	123	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		124
52	coro_context cctx;	125	/* the stack */
53
54	void *sptr;	126	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	127	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		128
		129	/* cpu state */
		130	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		131	JMPENV *top_env;
		132	coro_context cctx;
		133
		134	int inuse;
		135
		136	#if USE_VALGRIND
		137	int valgrind_id;
		138	#endif
		139	} coro_cctx;
		140
		141	enum {
		142	CF_RUNNING = 0x0001, /* coroutine is running */
		143	CF_READY = 0x0002, /* coroutine is ready */
		144	CF_NEW = 0x0004, /* ahs never been switched to */
		145	};
		146
		147	/* this is a structure representing a perl-level coroutine */
58	struct coro {	148	struct coro {
59	/* the optional C context */	149	/* the c coroutine allocated to this perl coroutine, if any */
60	coro_stack *stack;	150	coro_cctx *cctx;
61	void *cursp;
62	int gencnt;
63
64	/* optionally saved, might be zero */
65	AV *defav;
66	SV *defsv;
67	SV *errsv;
68
69	/* saved global state not related to stacks */
70	U8 dowarn;
71	I32 in_eval;
72
73	/* the stacks and related info (callchain etc..) */
74	PERL_SI *curstackinfo;
75	AV *curstack;
76	AV *mainstack;
77	SV **stack_sp;
78	OP *op;
79	SV **curpad;
80	SV **stack_base;
81	SV **stack_max;
82	SV **tmps_stack;
83	I32 tmps_floor;
84	I32 tmps_ix;
85	I32 tmps_max;
86	I32 *markstack;
87	I32 *markstack_ptr;
88	I32 *markstack_max;
89	I32 *scopestack;
90	I32 scopestack_ix;
91	I32 scopestack_max;
92	ANY *savestack;
93	I32 savestack_ix;
94	I32 savestack_max;
95	OP **retstack;
96	I32 retstack_ix;
97	I32 retstack_max;
98	COP *curcop;
99	JMPENV *top_env;
100		151
101	/* data associated with this coroutine (initial args) */	152	/* data associated with this coroutine (initial args) */
102	AV *args;	153	AV *args;
		154	int refcnt;
		155	int save; /* CORO_SAVE flags */
		156	int flags; /* CF_ flags */
		157
		158	/* optionally saved, might be zero */
		159	AV *defav; /* @_ */
		160	SV *defsv; /* $_ */
		161	SV *errsv; /* $@ */
		162	SV *irssv; /* $/ */
		163	SV *irssv_sv; /* real $/ cache */
		164
		165	#define VAR(name,type) type name;
		166	# include "state.h"
		167	#undef VAR
		168
		169	/* coro process data */
		170	int prio;
103	};	171	};
104		172
105	typedef struct coro *Coro__State;	173	typedef struct coro *Coro__State;
106	typedef struct coro *Coro__State_or_hashref;	174	typedef struct coro *Coro__State_or_hashref;
107		175
108	static AV *main_mainstack; /* used to differentiate between $main and others */	176	static AV *
109	static HV *coro_state_stash;	177	coro_clone_padlist (CV *cv)
110	static SV *ucoro_state_sv;
111	static U32 ucoro_state_hash;
112	static HV *padlist_cache;
113
114	/* mostly copied from op.c:cv_clone2 */
115	STATIC AV *
116	clone_padlist (AV *protopadlist)
117	{	178	{
118	AV *av;	179	AV *padlist = CvPADLIST (cv);
119	I32 ix;
120	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
121	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
122	SV **pname = AvARRAY (protopad_name);
123	SV **ppad = AvARRAY (protopad);
124	I32 fname = AvFILLp (protopad_name);
125	I32 fpad = AvFILLp (protopad);
126	AV *newpadlist, *newpad_name, *newpad;	180	AV *newpadlist, *newpad;
127	SV **npad;
128
129	newpad_name = newAV ();
130	for (ix = fname; ix >= 0; ix--)
131	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
132
133	newpad = newAV ();
134	av_fill (newpad, AvFILLp (protopad));
135	npad = AvARRAY (newpad);
136		181
137	newpadlist = newAV ();	182	newpadlist = newAV ();
138	AvREAL_off (newpadlist);	183	AvREAL_off (newpadlist);
139	av_store (newpadlist, 0, (SV *) newpad_name);	184	#if PERL_VERSION_ATLEAST (5,9,0)
		185	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		186	#else
		187	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		188	#endif
		189	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		190	--AvFILLp (padlist);
		191
		192	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
140	av_store (newpadlist, 1, (SV *) newpad);	193	av_store (newpadlist, 1, (SV *)newpad);
141		194
142	av = newAV (); /* will be @_ */	195	return newpadlist;
143	av_extend (av, 0);	196	}
144	av_store (newpad, 0, (SV *) av);
145	AvFLAGS (av) = AVf_REIFY;
146		197
147	for (ix = fpad; ix > 0; ix--)	198	static void
		199	free_padlist (AV *padlist)
		200	{
		201	/* may be during global destruction */
		202	if (SvREFCNT (padlist))
148	{	203	{
149	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	204	I32 i = AvFILLp (padlist);
150	if (namesv && namesv != &PL_sv_undef)	205	while (i >= 0)
151	{	206	{
152	char *name = SvPVX (namesv); /* XXX */	207	SV **svp = av_fetch (padlist, i--, FALSE);
153	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	208	if (svp)
154	{ /* lexical from outside? */
155	npad[ix] = SvREFCNT_inc (ppad[ix]);
156	}	209	{
157	else
158	{ /* our own lexical */
159	SV *sv;	210	SV *sv;
160	if (*name == '&')	211	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
161	sv = SvREFCNT_inc (ppad[ix]);	212	SvREFCNT_dec (sv);
162	else if (*name == '@')	213
163	sv = (SV *) newAV ();	214	SvREFCNT_dec (*svp);
164	else if (*name == '%')
165	sv = (SV *) newHV ();
166	else
167	sv = NEWSV (0, 0);
168	if (!SvPADBUSY (sv))
169	SvPADMY_on (sv);
170	npad[ix] = sv;
171	}	215	}
172	}	216	}
173	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	217
174	{	218	SvREFCNT_dec ((SV*)padlist);
175	npad[ix] = SvREFCNT_inc (ppad[ix]);
176	}
177	else
178	{
179	SV *sv = NEWSV (0, 0);
180	SvPADTMP_on (sv);
181	npad[ix] = sv;
182	}
183	}	219	}
		220	}
184		221
185	#if 0 /* return -ENOTUNDERSTOOD */	222	static int
186	/* Now that vars are all in place, clone nested closures. */	223	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		224	{
		225	AV *padlist;
		226	AV *av = (AV *)mg->mg_obj;
187		227
188	for (ix = fpad; ix > 0; ix--) {	228	/* casting is fun. */
189	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	229	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
190	if (namesv	230	free_padlist (padlist);
191	&& namesv != &PL_sv_undef	231
192	&& !(SvFLAGS(namesv) & SVf_FAKE)	232	SvREFCNT_dec (av);
193	&& *SvPVX(namesv) == '&'	233
194	&& CvCLONE(ppad[ix]))	234	return 0;
195	{	235	}
196	CV *kid = cv_clone((CV*)ppad[ix]);	236
197	SvREFCNT_dec(ppad[ix]);	237	#define PERL_MAGIC_coro PERL_MAGIC_ext
198	CvCLONE_on(kid);	238
199	SvPADMY_on(kid);	239	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
200	npad[ix] = (SV*)kid;	240
201	}	241	#define CORO_MAGIC(cv) \
		242	SvMAGIC (cv) \
		243	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		244	? SvMAGIC (cv) \
		245	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		246	: 0
		247
		248	/* the next two functions merely cache the padlists */
		249	static void
		250	get_padlist (CV *cv)
		251	{
		252	MAGIC *mg = CORO_MAGIC (cv);
		253	AV *av;
		254
		255	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		256	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		257	else
		258	{
		259	#if 0
		260	/* this is probably cleaner, but also slower? */
		261	CV *cp = Perl_cv_clone (cv);
		262	CvPADLIST (cv) = CvPADLIST (cp);
		263	CvPADLIST (cp) = 0;
		264	SvREFCNT_dec (cp);
		265	#else
		266	CvPADLIST (cv) = coro_clone_padlist (cv);
		267	#endif
		268	}
		269	}
		270
		271	static void
		272	put_padlist (CV *cv)
		273	{
		274	MAGIC *mg = CORO_MAGIC (cv);
		275	AV *av;
		276
		277	if (!mg)
		278	{
		279	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		280	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		281	mg->mg_virtual = &vtbl_coro;
		282	mg->mg_obj = (SV *)newAV ();
202	}	283	}
203	#endif
204		284
205	return newpadlist;	285	av = (AV *)mg->mg_obj;
206	}
207		286
208	#ifdef MAY_FLUSH	287	if (AvFILLp (av) >= AvMAX (av))
209	STATIC AV *	288	av_extend (av, AvMAX (av) + 1);
210	free_padlist (AV *padlist)
211	{
212	/* may be during global destruction */
213	if (SvREFCNT(padlist))
214	{
215	I32 i = AvFILLp(padlist);
216	while (i >= 0)
217	{
218	SV **svp = av_fetch(padlist, i--, FALSE);
219	SV *sv = svp ? *svp : Nullsv;
220	if (sv)
221	SvREFCNT_dec(sv);
222	}
223		289
224	SvREFCNT_dec((SV*)padlist);	290	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
225	}
226	}	291	}
227	#endif
228
229	/* the next two functions merely cache the padlists */
230	STATIC void
231	get_padlist (CV *cv)
232	{
233	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
234
235	if (he && AvFILLp ((AV *)*he) >= 0)
236	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
237	else
238	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
239	}
240
241	STATIC void
242	put_padlist (CV *cv)
243	{
244	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
245
246	if (SvTYPE (*he) != SVt_PVAV)
247	{
248	SvREFCNT_dec (*he);
249	*he = (SV *)newAV ();
250	}
251
252	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
253	}
254
255	#ifdef MAY_FLUSH
256	STATIC void
257	flush_padlist_cache ()
258	{
259	HV *hv = padlist_cache;
260	padlist_cache = newHV ();
261
262	if (hv_iterinit (hv))
263	{
264	HE *he;
265	AV *padlist;
266
267	while (!!(he = hv_iternext (hv)))
268	{
269	AV *av = (AV *)HeVAL(he);
270
271	/* casting is fun. */
272	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
273	free_padlist (padlist);
274	}
275	}
276
277	SvREFCNT_dec (hv);
278	}
279	#endif
280		292
281	#define SB do {	293	#define SB do {
282	#define SE } while (0)	294	#define SE } while (0)
283		295
284	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
285	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
286
287	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	296	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
288		297
289	static void	298	static void
290	load_state(pTHX_ Coro__State c)	299	load_perl (Coro__State c)
291	{	300	{
292	PL_dowarn = c->dowarn;	301	#define VAR(name,type) PL_ ## name = c->name;
293	PL_in_eval = c->in_eval;	302	# include "state.h"
294		303	#undef VAR
295	PL_curstackinfo = c->curstackinfo;
296	PL_curstack = c->curstack;
297	PL_mainstack = c->mainstack;
298	PL_stack_sp = c->stack_sp;
299	PL_op = c->op;
300	PL_curpad = c->curpad;
301	PL_stack_base = c->stack_base;
302	PL_stack_max = c->stack_max;
303	PL_tmps_stack = c->tmps_stack;
304	PL_tmps_floor = c->tmps_floor;
305	PL_tmps_ix = c->tmps_ix;
306	PL_tmps_max = c->tmps_max;
307	PL_markstack = c->markstack;
308	PL_markstack_ptr = c->markstack_ptr;
309	PL_markstack_max = c->markstack_max;
310	PL_scopestack = c->scopestack;
311	PL_scopestack_ix = c->scopestack_ix;
312	PL_scopestack_max = c->scopestack_max;
313	PL_savestack = c->savestack;
314	PL_savestack_ix = c->savestack_ix;
315	PL_savestack_max = c->savestack_max;
316	PL_retstack = c->retstack;
317	PL_retstack_ix = c->retstack_ix;
318	PL_retstack_max = c->retstack_max;
319	PL_curcop = c->curcop;
320	PL_top_env = c->top_env;
321		304
322	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	305	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
323	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	306	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
324	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	307	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		308	if (c->irssv)
		309	{
		310	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		311	SvREFCNT_dec (c->irssv);
		312	else
		313	{
		314	REPLACE_SV (PL_rs, c->irssv);
		315	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		316	sv_setsv (c->irssv_sv, PL_rs);
		317	}
		318	}
325		319
326	{	320	{
327	dSP;	321	dSP;
328	CV *cv;	322	CV *cv;
329		323
330	/* now do the ugly restore mess */	324	/* now do the ugly restore mess */
331	while ((cv = (CV *)POPs))	325	while ((cv = (CV *)POPs))
332	{	326	{
333	AV *padlist = (AV *)POPs;
334
335	if (padlist)
336	{
337	put_padlist (cv); /* mark this padlist as available */	327	put_padlist (cv); /* mark this padlist as available */
338	CvPADLIST(cv) = padlist;	328	CvDEPTH (cv) = PTR2IV (POPs);
339	#ifdef USE_THREADS	329	CvPADLIST (cv) = (AV *)POPs;
340	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
341	#endif
342	}
343
344	++CvDEPTH(cv);
345	}	330	}
346		331
347	PUTBACK;	332	PUTBACK;
348	}	333	}
349	}	334	}
350		335
351	static void	336	static void
352	save_state(pTHX_ Coro__State c, int flags)	337	save_perl (Coro__State c)
353	{	338	{
354	{	339	{
355	dSP;	340	dSP;
356	I32 cxix = cxstack_ix;	341	I32 cxix = cxstack_ix;
357	PERL_CONTEXT *ccstk = cxstack;	342	PERL_CONTEXT *ccstk = cxstack;
…		…
364		349
365	PUSHs (Nullsv);	350	PUSHs (Nullsv);
366	/* this loop was inspired by pp_caller */	351	/* this loop was inspired by pp_caller */
367	for (;;)	352	for (;;)
368	{	353	{
369	do	354	while (cxix >= 0)
370	{	355	{
371	PERL_CONTEXT *cx = &ccstk[cxix--];	356	PERL_CONTEXT *cx = &ccstk[cxix--];
372		357
373	if (CxTYPE(cx) == CXt_SUB)	358	if (CxTYPE (cx) == CXt_SUB)
374	{	359	{
375	CV *cv = cx->blk_sub.cv;	360	CV *cv = cx->blk_sub.cv;
		361
376	if (CvDEPTH(cv))	362	if (CvDEPTH (cv))
377	{	363	{
378	#ifdef USE_THREADS
379	/*XPUSHs ((SV *)CvOWNER(cv));*/
380	/*CvOWNER(cv) = 0;*/
381	/*error must unlock this cv etc.. etc...*/
382	#endif
383	EXTEND (SP, CvDEPTH(cv)*2);	364	EXTEND (SP, 3);
384		365
385	while (--CvDEPTH(cv))
386	{
387	/* this tells the restore code to increment CvDEPTH */
388	PUSHs (Nullsv);
389	PUSHs ((SV *)cv);
390	}
391
392	PUSHs ((SV *)CvPADLIST(cv));	366	PUSHs ((SV *)CvPADLIST (cv));
		367	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
393	PUSHs ((SV *)cv);	368	PUSHs ((SV *)cv);
394		369
		370	CvDEPTH (cv) = 0;
395	get_padlist (cv); /* this is a monster */	371	get_padlist (cv);
396	}	372	}
397	}	373	}
		374	#ifdef CXt_FORMAT
398	else if (CxTYPE(cx) == CXt_FORMAT)	375	else if (CxTYPE (cx) == CXt_FORMAT)
399	{	376	{
400	/* I never used formats, so how should I know how these are implemented? */	377	/* I never used formats, so how should I know how these are implemented? */
401	/* my bold guess is as a simple, plain sub... */	378	/* my bold guess is as a simple, plain sub... */
402	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
403	}	380	}
		381	#endif
404	}	382	}
405	while (cxix >= 0);
406		383
407	if (top_si->si_type == PERLSI_MAIN)	384	if (top_si->si_type == PERLSI_MAIN)
408	break;	385	break;
409		386
410	top_si = top_si->si_prev;	387	top_si = top_si->si_prev;
…		…
413	}	390	}
414		391
415	PUTBACK;	392	PUTBACK;
416	}	393	}
417		394
418	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	395	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
419	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	396	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
420	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	397	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		398	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
421		399
422	/* I have not the slightest idea of why av_reify is necessary */	400	#define VAR(name,type)c->name = PL_ ## name;
423	/* but if it's missing the defav contents magically get replaced sometimes */	401	# include "state.h"
424	if (c->defav)	402	#undef VAR
425	av_reify (c->defav);
426
427	c->dowarn = PL_dowarn;
428	c->in_eval = PL_in_eval;
429
430	c->curstackinfo = PL_curstackinfo;
431	c->curstack = PL_curstack;
432	c->mainstack = PL_mainstack;
433	c->stack_sp = PL_stack_sp;
434	c->op = PL_op;
435	c->curpad = PL_curpad;
436	c->stack_base = PL_stack_base;
437	c->stack_max = PL_stack_max;
438	c->tmps_stack = PL_tmps_stack;
439	c->tmps_floor = PL_tmps_floor;
440	c->tmps_ix = PL_tmps_ix;
441	c->tmps_max = PL_tmps_max;
442	c->markstack = PL_markstack;
443	c->markstack_ptr = PL_markstack_ptr;
444	c->markstack_max = PL_markstack_max;
445	c->scopestack = PL_scopestack;
446	c->scopestack_ix = PL_scopestack_ix;
447	c->scopestack_max = PL_scopestack_max;
448	c->savestack = PL_savestack;
449	c->savestack_ix = PL_savestack_ix;
450	c->savestack_max = PL_savestack_max;
451	c->retstack = PL_retstack;
452	c->retstack_ix = PL_retstack_ix;
453	c->retstack_max = PL_retstack_max;
454	c->curcop = PL_curcop;
455	c->top_env = PL_top_env;
456	}	403	}
457		404
458	/*	405	/*
459	* allocate various perl stacks. This is an exact copy	406	* allocate various perl stacks. This is an exact copy
460	* of perl.c:init_stacks, except that it uses less memory	407	* of perl.c:init_stacks, except that it uses less memory
461	* on the assumption that coroutines do not usually need	408	* on the (sometimes correct) assumption that coroutines do
462	* a lot of stackspace.	409	* not usually need a lot of stackspace.
463	*/	410	*/
464	STATIC void	411	static void
465	coro_init_stacks (pTHX)	412	coro_init_stacks ()
466	{	413	{
467	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	414	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
468	PL_curstackinfo->si_type = PERLSI_MAIN;	415	PL_curstackinfo->si_type = PERLSI_MAIN;
469	PL_curstack = PL_curstackinfo->si_stack;	416	PL_curstack = PL_curstackinfo->si_stack;
470	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	417	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
471		418
472	PL_stack_base = AvARRAY(PL_curstack);	419	PL_stack_base = AvARRAY(PL_curstack);
473	PL_stack_sp = PL_stack_base;	420	PL_stack_sp = PL_stack_base;
474	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	421	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
475		422
476	New(50,PL_tmps_stack,96,SV*);	423	New(50,PL_tmps_stack,128,SV*);
477	PL_tmps_floor = -1;	424	PL_tmps_floor = -1;
478	PL_tmps_ix = -1;	425	PL_tmps_ix = -1;
479	PL_tmps_max = 96;	426	PL_tmps_max = 128;
480		427
481	New(54,PL_markstack,16,I32);	428	New(54,PL_markstack,32,I32);
482	PL_markstack_ptr = PL_markstack;	429	PL_markstack_ptr = PL_markstack;
483	PL_markstack_max = PL_markstack + 16;	430	PL_markstack_max = PL_markstack + 32;
484		431
		432	#ifdef SET_MARK_OFFSET
485	SET_MARK_OFFSET;	433	SET_MARK_OFFSET;
		434	#endif
486		435
487	New(54,PL_scopestack,16,I32);	436	New(54,PL_scopestack,32,I32);
488	PL_scopestack_ix = 0;	437	PL_scopestack_ix = 0;
489	PL_scopestack_max = 16;	438	PL_scopestack_max = 32;
490		439
491	New(54,PL_savestack,96,ANY);	440	New(54,PL_savestack,64,ANY);
492	PL_savestack_ix = 0;	441	PL_savestack_ix = 0;
493	PL_savestack_max = 96;	442	PL_savestack_max = 64;
494		443
		444	#if !PERL_VERSION_ATLEAST (5,9,0)
495	New(54,PL_retstack,8,OP*);	445	New(54,PL_retstack,16,OP*);
496	PL_retstack_ix = 0;	446	PL_retstack_ix = 0;
497	PL_retstack_max = 8;	447	PL_retstack_max = 16;
		448	#endif
498	}	449	}
499		450
500	/*	451	/*
501	* destroy the stacks, the callchain etc...	452	* destroy the stacks, the callchain etc...
502	* still there is a memleak of 128 bytes...
503	*/	453	*/
504	STATIC void	454	static void
505	destroy_stacks(pTHX)	455	coro_destroy_stacks ()
506	{	456	{
		457	if (!IN_DESTRUCT)
		458	{
507	/* is this ugly, I ask? */	459	/* is this ugly, I ask? */
508	while (PL_scopestack_ix)	460	LEAVE_SCOPE (0);
509	LEAVE;
510		461
511	/* sure it is, but more important: is it correct?? :/ */	462	/* sure it is, but more important: is it correct?? :/ */
512	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
513	FREETMPS;	463	FREETMPS;
		464
		465	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		466	}
514		467
515	while (PL_curstackinfo->si_next)	468	while (PL_curstackinfo->si_next)
516	PL_curstackinfo = PL_curstackinfo->si_next;	469	PL_curstackinfo = PL_curstackinfo->si_next;
517		470
518	while (PL_curstackinfo)	471	while (PL_curstackinfo)
519	{	472	{
520	PERL_SI *p = PL_curstackinfo->si_prev;	473	PERL_SI *p = PL_curstackinfo->si_prev;
521		474
522	{	475	{ /*D*//*remove*/
523	dSP;	476	dSP;
524	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	477	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
525	PUTBACK; /* possibly superfluous */	478	PUTBACK; /* possibly superfluous */
526	}	479	}
527		480
528	dounwind(-1);	481	if (!IN_DESTRUCT)
529		482	{
		483	dounwind (-1);/*D*//*remove*/
530	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
		485	}
		486
531	Safefree(PL_curstackinfo->si_cxstack);	487	Safefree (PL_curstackinfo->si_cxstack);
532	Safefree(PL_curstackinfo);	488	Safefree (PL_curstackinfo);
533	PL_curstackinfo = p;	489	PL_curstackinfo = p;
534	}	490	}
535		491
536	Safefree(PL_tmps_stack);	492	Safefree (PL_tmps_stack);
537	Safefree(PL_markstack);	493	Safefree (PL_markstack);
538	Safefree(PL_scopestack);	494	Safefree (PL_scopestack);
539	Safefree(PL_savestack);	495	Safefree (PL_savestack);
		496	#if !PERL_VERSION_ATLEAST (5,9,0)
540	Safefree(PL_retstack);	497	Safefree (PL_retstack);
541	}
542
543	static void
544	allocate_stack (Coro__State ctx, int alloc)
545	{
546	coro_stack *stack;
547
548	New (0, stack, 1, coro_stack);
549
550	stack->refcnt = 1;
551	stack->usecnt = 1;
552	stack->gencnt = ctx->gencnt = 0;
553	if (alloc)
554	{
555	#ifdef HAVE_MMAP
556	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
557	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
558	if (stack->sptr == (void *)-1)
559	#endif	498	#endif
560	{
561	/*FIXME*//*D*//* reasonable stack size! */
562	stack->ssize = -4096 * sizeof (long);
563	New (0, stack->sptr, 4096, long);
564	}
565	}
566	else
567	stack->sptr = 0;
568
569	ctx->stack = stack;
570	}	499	}
571		500
572	static void	501	static void
573	deallocate_stack (Coro__State ctx)	502	setup_coro (struct coro *coro)
574	{
575	coro_stack *stack = ctx->stack;
576
577	ctx->stack = 0;
578
579	if (stack)
580	{
581	if (!--stack->refcnt)
582	{
583	#ifdef HAVE_MMAP
584	if (stack->ssize > 0 && stack->sptr)
585	munmap (stack->sptr, stack->ssize);
586	else
587	#else
588	Safefree (stack->sptr);
589	#endif
590	Safefree (stack);
591	}
592	else if (ctx->gencnt == stack->gencnt)
593	--stack->usecnt;
594	}
595	}
596
597	static void
598	setup_coro (void *arg)
599	{	503	{
600	/*	504	/*
601	* emulate part of the perl startup here.	505	* emulate part of the perl startup here.
602	*/	506	*/
		507
		508	coro_init_stacks ();
		509
		510	PL_curcop = &PL_compiling;
		511	PL_in_eval = EVAL_NULL;
		512	PL_curpm = 0;
		513	PL_localizing = 0;
		514	PL_dirty = 0;
		515	PL_restartop = 0;
		516
		517	{
		518	dSP;
		519	LOGOP myop;
		520
		521	SvREFCNT_dec (GvAV (PL_defgv));
		522	GvAV (PL_defgv) = coro->args; coro->args = 0;
		523
		524	Zero (&myop, 1, LOGOP);
		525	myop.op_next = Nullop;
		526	myop.op_flags = OPf_WANT_VOID;
		527
		528	PUSHMARK (SP);
		529	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		530	PUTBACK;
		531	PL_op = (OP *)&myop;
		532	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		533	SPAGAIN;
		534	}
		535
		536	ENTER; /* necessary e.g. for dounwind */
		537	}
		538
		539	static void
		540	free_coro_mortal ()
		541	{
		542	if (coro_mortal)
		543	{
		544	SvREFCNT_dec (coro_mortal);
		545	coro_mortal = 0;
		546	}
		547	}
		548
		549	/* inject a fake call to Coro::State::_cctx_init into the execution */
		550	static void NOINLINE
		551	prepare_cctx (coro_cctx *cctx)
		552	{
603	dSP;	553	dSP;
604	Coro__State ctx = (Coro__State)arg;	554	LOGOP myop;
605	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
606		555
607	coro_init_stacks (aTHX);	556	Zero (&myop, 1, LOGOP);
608	/*PL_curcop = 0;*/	557	myop.op_next = PL_op;
609	/*PL_in_eval = PL_in_eval;*/ /* inherit */	558	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
610	SvREFCNT_dec (GvAV (PL_defgv));
611	GvAV (PL_defgv) = ctx->args;
612		559
		560	PUSHMARK (SP);
		561	EXTEND (SP, 2);
		562	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		563	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		564	PUTBACK;
		565	PL_op = (OP *)&myop;
		566	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
613	SPAGAIN;	567	SPAGAIN;
614
615	if (ctx->stack)
616	{
617	ctx->cursp = 0;
618
619	PUSHMARK(SP);
620	PUTBACK;
621	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
622
623	if (SvTRUE (ERRSV))
624	croak (NULL);
625	else
626	croak ("FATAL: CCTXT coroutine returned!");
627	}
628	else
629	{
630	UNOP myop;
631
632	PL_op = (OP *)&myop;
633
634	Zero(&myop, 1, UNOP);
635	myop.op_next = Nullop;
636	myop.op_flags = OPf_WANT_VOID;
637
638	PUSHMARK(SP);
639	XPUSHs (sub_init);
640	/*
641	* the next line is slightly wrong, as PL_op->op_next
642	* is actually being executed so we skip the first op.
643	* that doesn't matter, though, since it is only
644	* pp_nextstate and we never return...
645	* ah yes, and I don't care anyways ;)
646	*/
647	PUTBACK;
648	PL_op = pp_entersub();
649	SPAGAIN;
650
651	ENTER; /* necessary e.g. for dounwind */
652	}
653	}	568	}
654		569
655	static void	570	static void
656	continue_coro (void *arg)	571	coro_run (void *arg)
657	{	572	{
		573	/* coro_run is the alternative tail of transfer(), so unlock here. */
		574	UNLOCK;
		575
658	/*	576	/*
659	* this is a _very_ stripped down perl interpreter ;)	577	* this is a _very_ stripped down perl interpreter ;)
660	*/	578	*/
661	Coro__State ctx = (Coro__State)arg;	579	PL_top_env = &PL_start_env;
662		580
663	/*FIXME*//* must set up top_env here */	581	/* inject call to cctx_init */
664	ctx->cursp = 0;	582	prepare_cctx ((coro_cctx *)arg);
665	PL_op = PL_op->op_next;
666	CALLRUNOPS(aTHX);
667		583
		584	/* somebody will hit me for both perl_run and PL_restartop */
		585	PL_restartop = PL_op;
		586	perl_run (PL_curinterp);
		587
		588	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
668	abort ();	589	abort ();
669	}	590	}
670		591
671	STATIC void	592	static coro_cctx *
		593	cctx_new ()
		594	{
		595	coro_cctx *cctx;
		596
		597	++cctx_count;
		598
		599	Newz (0, cctx, 1, coro_cctx);
		600
		601	#if HAVE_MMAP
		602
		603	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		604	/* mmap supposedly does allocate-on-write for us */
		605	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		606
		607	if (cctx->sptr == (void *)-1)
		608	{
		609	perror ("FATAL: unable to mmap stack for coroutine");
		610	_exit (EXIT_FAILURE);
		611	}
		612
		613	# if STACKGUARD
		614	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		615	# endif
		616
		617	#else
		618
		619	cctx->ssize = STACKSIZE * (long)sizeof (long);
		620	New (0, cctx->sptr, STACKSIZE, long);
		621
		622	if (!cctx->sptr)
		623	{
		624	perror ("FATAL: unable to malloc stack for coroutine");
		625	_exit (EXIT_FAILURE);
		626	}
		627
		628	#endif
		629
		630	#if USE_VALGRIND
		631	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		632	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		633	cctx->ssize + (char *)cctx->sptr
		634	);
		635	#endif
		636
		637	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		638
		639	return cctx;
		640	}
		641
		642	static void
		643	cctx_destroy (coro_cctx *cctx)
		644	{
		645	if (!cctx)
		646	return;
		647
		648	--cctx_count;
		649
		650	#if USE_VALGRIND
		651	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		652	#endif
		653
		654	#if HAVE_MMAP
		655	munmap (cctx->sptr, cctx->ssize);
		656	#else
		657	Safefree (cctx->sptr);
		658	#endif
		659
		660	Safefree (cctx);
		661	}
		662
		663	static coro_cctx *
		664	cctx_get ()
		665	{
		666	coro_cctx *cctx;
		667
		668	if (cctx_first)
		669	{
		670	cctx = cctx_first;
		671	cctx_first = cctx->next;
		672	--cctx_idle;
		673	}
		674	else
		675	{
		676	cctx = cctx_new ();
		677	PL_op = PL_op->op_next;
		678	}
		679
		680	return cctx;
		681	}
		682
		683	static void
		684	cctx_put (coro_cctx *cctx)
		685	{
		686	/* free another cctx if overlimit */
		687	if (cctx_idle >= MAX_IDLE_CCTX)
		688	{
		689	coro_cctx *first = cctx_first;
		690	cctx_first = first->next;
		691	--cctx_idle;
		692
		693	assert (!first->inuse);
		694	cctx_destroy (first);
		695	}
		696
		697	++cctx_idle;
		698	cctx->next = cctx_first;
		699	cctx_first = cctx;
		700	}
		701
		702	/* never call directly, always through the coro_state_transfer global variable */
		703	static void NOINLINE
672	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	704	transfer (struct coro *prev, struct coro *next)
673	{	705	{
674	dSP;
675	dSTACKLEVEL;	706	dSTACKLEVEL;
676		707
		708	/* sometimes transfer is only called to set idle_sp */
		709	if (!next)
		710	{
		711	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		712	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		713	}
677	if (prev != next)	714	else if (prev != next)
678	{	715	{
679	if (next->mainstack)	716	coro_cctx *prev__cctx;
		717
		718	if (prev->flags & CF_NEW)
680	{	719	{
681	SAVE (prev, flags);	720	/* create a new empty context */
682	LOAD (next);	721	Newz (0, prev->cctx, 1, coro_cctx);
683		722	prev->cctx->inuse = 1;
684	/* mark this state as in-use */	723	prev->flags &= ~CF_NEW;
685	next->mainstack = 0;	724	prev->flags |= CF_RUNNING;
686	next->tmps_ix = -2;
687
688	/* stacklevel changed? if yes, grab the stack for us! */
689	if (flags & TRANSFER_SAVE_CCTXT)
690	{
691	if (!prev->stack)
692	allocate_stack (prev, 0);
693	else if (prev->cursp != stacklevel
694	&& prev->stack->usecnt > 1)
695	{
696	prev->gencnt = ++prev->stack->gencnt;
697	prev->stack->usecnt = 1;
698	}
699
700	/* has our stack been invalidated? */
701	if (next->stack && next->stack->gencnt != next->gencnt)
702	{
703	deallocate_stack (next);
704	allocate_stack (next, 1);
705	coro_create (&(next->stack->cctx),
706	continue_coro, (void *)next,
707	next->stack->sptr, labs (next->stack->ssize));
708	}
709
710	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
711	}
712
713	}	725	}
714	else if (next->tmps_ix == -2)	726
715	croak ("tried to transfer to running coroutine");	727	/*TODO: must not croak here */
		728	if (!prev->flags & CF_RUNNING)
		729	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		730
		731	if (next->flags & CF_RUNNING)
		732	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		733
		734	prev->flags &= ~CF_RUNNING;
		735	next->flags |= CF_RUNNING;
		736
		737	LOCK;
		738
		739	if (next->flags & CF_NEW)
		740	{
		741	/* need to start coroutine */
		742	next->flags &= ~CF_NEW;
		743	/* first get rid of the old state */
		744	save_perl (prev);
		745	/* setup coroutine call */
		746	setup_coro (next);
		747	/* need a new stack */
		748	assert (!next->cctx);
		749	}
716	else	750	else
717	{	751	{
718	SAVE (prev, -1); /* first get rid of the old state */	752	/* coroutine already started */
719		753	save_perl (prev);
720	if (flags & TRANSFER_SAVE_CCTXT)	754	load_perl (next);
721	{
722	if (!prev->stack)
723	allocate_stack (prev, 0);
724
725	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
726	{
727	setup_coro (next);
728
729	prev->stack->refcnt++;
730	prev->stack->usecnt++;
731	next->stack = prev->stack;
732	next->gencnt = prev->gencnt;
733	}
734	else
735	{
736	allocate_stack (next, 1);
737	coro_create (&(next->stack->cctx),
738	setup_coro, (void *)next,
739	next->stack->sptr, labs (next->stack->ssize));
740	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
741	}
742	}
743	else
744	setup_coro (next);
745	}	755	}
		756
		757	prev__cctx = prev->cctx;
		758
		759	/* possibly "free" the cctx */
		760	if (prev__cctx->idle_sp == STACKLEVEL)
		761	{
		762	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		763	assert (PL_top_env == prev__cctx->top_env);
		764
		765	prev->cctx = 0;
		766
		767	cctx_put (prev__cctx);
		768	prev__cctx->inuse = 0;
		769	}
		770
		771	if (!next->cctx)
		772	{
		773	next->cctx = cctx_get ();
		774	assert (!next->cctx->inuse);
		775	next->cctx->inuse = 1;
		776	}
		777
		778	if (prev__cctx != next->cctx)
		779	{
		780	prev__cctx->top_env = PL_top_env;
		781	PL_top_env = next->cctx->top_env;
		782	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		783	}
		784
		785	free_coro_mortal ();
		786
		787	UNLOCK;
746	}	788	}
		789	}
747		790
748	next->cursp = stacklevel;	791	struct transfer_args
		792	{
		793	struct coro *prev, *next;
		794	};
		795
		796	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		797
		798	static void
		799	coro_state_destroy (struct coro *coro)
		800	{
		801	if (coro->refcnt--)
		802	return;
		803
		804	if (coro->mainstack && coro->mainstack != main_mainstack)
		805	{
		806	struct coro temp;
		807	Zero (&temp, 1, struct coro);
		808	temp.save = CORO_SAVE_ALL;
		809
		810	if (coro->flags & CF_RUNNING)
		811	croak ("FATAL: tried to destroy currently running coroutine");
		812
		813	save_perl (&temp);
		814	load_perl (coro);
		815
		816	coro_destroy_stacks ();
		817
		818	load_perl (&temp); /* this will get rid of defsv etc.. */
		819
		820	coro->mainstack = 0;
		821	}
		822
		823	cctx_destroy (coro->cctx);
		824	SvREFCNT_dec (coro->args);
		825	Safefree (coro);
		826	}
		827
		828	static int
		829	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		830	{
		831	struct coro *coro = (struct coro *)mg->mg_ptr;
		832	mg->mg_ptr = 0;
		833
		834	coro_state_destroy (coro);
		835
		836	return 0;
		837	}
		838
		839	static int
		840	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		841	{
		842	struct coro *coro = (struct coro *)mg->mg_ptr;
		843
		844	++coro->refcnt;
		845
		846	return 0;
		847	}
		848
		849	static MGVTBL coro_state_vtbl = {
		850	0, 0, 0, 0,
		851	coro_state_clear,
		852	0,
		853	#ifdef MGf_DUP
		854	coro_state_dup,
		855	#else
		856	# define MGf_DUP 0
		857	#endif
		858	};
		859
		860	static struct coro *
		861	SvSTATE (SV *coro)
		862	{
		863	HV *stash;
		864	MAGIC *mg;
		865
		866	if (SvROK (coro))
		867	coro = SvRV (coro);
		868
		869	stash = SvSTASH (coro);
		870	if (stash != coro_stash && stash != coro_state_stash)
		871	{
		872	/* very slow, but rare, check */
		873	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		874	croak ("Coro::State object required");
		875	}
		876
		877	mg = SvMAGIC (coro);
		878	assert (mg->mg_type == PERL_MAGIC_ext);
		879	return (struct coro *)mg->mg_ptr;
		880	}
		881
		882	static void
		883	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		884	{
		885	ta->prev = SvSTATE (prev_sv);
		886	ta->next = SvSTATE (next_sv);
		887	}
		888
		889	static void
		890	api_transfer (SV *prev_sv, SV *next_sv)
		891	{
		892	struct transfer_args ta;
		893
		894	prepare_transfer (&ta, prev_sv, next_sv);
		895	TRANSFER (ta);
		896	}
		897
		898	static int
		899	api_save (SV *coro_sv, int new_save)
		900	{
		901	struct coro *coro = SvSTATE (coro_sv);
		902	int old_save = coro->save;
		903
		904	if (new_save >= 0)
		905	coro->save = new_save;
		906
		907	return old_save;
		908	}
		909
		910	/** Coro ********************************************************************/
		911
		912	#define PRIO_MAX 3
		913	#define PRIO_HIGH 1
		914	#define PRIO_NORMAL 0
		915	#define PRIO_LOW -1
		916	#define PRIO_IDLE -3
		917	#define PRIO_MIN -4
		918
		919	/* for Coro.pm */
		920	static SV *coro_current;
		921	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		922	static int coro_nready;
		923
		924	static void
		925	coro_enq (SV *coro_sv)
		926	{
		927	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		928	coro_nready++;
		929	}
		930
		931	static SV *
		932	coro_deq (int min_prio)
		933	{
		934	int prio = PRIO_MAX - PRIO_MIN;
		935
		936	min_prio -= PRIO_MIN;
		937	if (min_prio < 0)
		938	min_prio = 0;
		939
		940	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		941	if (AvFILLp (coro_ready [prio]) >= 0)
		942	{
		943	coro_nready--;
		944	return av_shift (coro_ready [prio]);
		945	}
		946
		947	return 0;
		948	}
		949
		950	static int
		951	api_ready (SV *coro_sv)
		952	{
		953	struct coro *coro;
		954
		955	if (SvROK (coro_sv))
		956	coro_sv = SvRV (coro_sv);
		957
		958	coro = SvSTATE (coro_sv);
		959
		960	if (coro->flags & CF_READY)
		961	return 0;
		962
		963	#if 0 /* this is actually harmless */
		964	if (coro->flags & CF_RUNNING)
		965	croak ("Coro::ready called on currently running coroutine");
		966	#endif
		967
		968	coro->flags |= CF_READY;
		969
		970	LOCK;
		971	coro_enq (SvREFCNT_inc (coro_sv));
		972	UNLOCK;
		973
		974	return 1;
		975	}
		976
		977	static int
		978	api_is_ready (SV *coro_sv)
		979	{
		980	return !!SvSTATE (coro_sv)->flags & CF_READY;
		981	}
		982
		983	static void
		984	prepare_schedule (struct transfer_args *ta)
		985	{
		986	SV *prev, *next;
		987
		988	for (;;)
		989	{
		990	LOCK;
		991	next = coro_deq (PRIO_MIN);
		992	UNLOCK;
		993
		994	if (next)
		995	break;
		996
		997	{
		998	dSP;
		999
		1000	ENTER;
		1001	SAVETMPS;
		1002
		1003	PUSHMARK (SP);
		1004	PUTBACK;
		1005	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1006
		1007	FREETMPS;
		1008	LEAVE;
		1009	}
		1010	}
		1011
		1012	prev = SvRV (coro_current);
		1013	SvRV_set (coro_current, next);
		1014
		1015	/* free this only after the transfer */
		1016	LOCK;
		1017	free_coro_mortal ();
		1018	UNLOCK;
		1019	coro_mortal = prev;
		1020
		1021	assert (!SvROK(prev));//D
		1022	assert (!SvROK(next));//D
		1023
		1024	ta->prev = SvSTATE (prev);
		1025	ta->next = SvSTATE (next);
		1026
		1027	assert (ta->next->flags & CF_READY);
		1028	ta->next->flags &= ~CF_READY;
		1029	}
		1030
		1031	static void
		1032	prepare_cede (struct transfer_args *ta)
		1033	{
		1034	api_ready (coro_current);
		1035
		1036	prepare_schedule (ta);
		1037	}
		1038
		1039	static void
		1040	api_schedule (void)
		1041	{
		1042	struct transfer_args ta;
		1043
		1044	prepare_schedule (&ta);
		1045	TRANSFER (ta);
		1046	}
		1047
		1048	static void
		1049	api_cede (void)
		1050	{
		1051	struct transfer_args ta;
		1052
		1053	prepare_cede (&ta);
		1054	TRANSFER (ta);
749	}	1055	}
750		1056
751	MODULE = Coro::State PACKAGE = Coro::State	1057	MODULE = Coro::State PACKAGE = Coro::State
752		1058
753	PROTOTYPES: ENABLE	1059	PROTOTYPES: DISABLE
754		1060
755	BOOT:	1061	BOOT:
756	{ /* {} necessary for stoopid perl-5.6.x */	1062	{
757	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1063	#ifdef USE_ITHREADS
758	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1064	MUTEX_INIT (&coro_mutex);
		1065	#endif
		1066	BOOT_PAGESIZE;
		1067
759	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1068	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
760		1069
761	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1070	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
762	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1071	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
763	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1072	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1073	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
764	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1074	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
765
766	if (!padlist_cache)
767	padlist_cache = newHV ();
768		1075
769	main_mainstack = PL_mainstack;	1076	main_mainstack = PL_mainstack;
770	}
771		1077
772	Coro::State	1078	coroapi.ver = CORO_API_VERSION;
773	_newprocess(args)	1079	coroapi.transfer = api_transfer;
774	SV * args	1080
775	PROTOTYPE: $	1081	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1082	}
		1083
		1084	SV *
		1085	new (char *klass, ...)
776	CODE:	1086	CODE:
777	Coro__State coro;	1087	{
		1088	struct coro *coro;
		1089	HV *hv;
		1090	int i;
778		1091
779	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
780	croak ("Coro::State::_newprocess expects an arrayref");
781
782	New (0, coro, 1, struct coro);	1092	Newz (0, coro, 1, struct coro);
		1093	coro->args = newAV ();
		1094	coro->save = CORO_SAVE_ALL;
		1095	coro->flags = CF_NEW;
783		1096
784	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1097	hv = newHV ();
785	coro->mainstack = 0; /* actual work is done inside transfer */	1098	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
786	coro->stack = 0;	1099	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
787		1100
788	RETVAL = coro;	1101	for (i = 1; i < items; i++)
		1102	av_push (coro->args, newSVsv (ST (i)));
		1103	}
789	OUTPUT:	1104	OUTPUT:
790	RETVAL	1105	RETVAL
791		1106
		1107	int
		1108	save (SV *coro, int new_save = -1)
		1109	CODE:
		1110	RETVAL = api_save (coro, new_save);
		1111	OUTPUT:
		1112	RETVAL
		1113
792	void	1114	void
793	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1115	_set_stacklevel (...)
794	Coro::State_or_hashref prev	1116	ALIAS:
795	Coro::State_or_hashref next	1117	Coro::State::transfer = 1
796	int flags	1118	Coro::schedule = 2
797	PROTOTYPE: @	1119	Coro::cede = 3
798	CODE:	1120	CODE:
799	transfer (aTHX_ prev, next, flags);	1121	{
		1122	struct transfer_args ta;
		1123
		1124	switch (ix)
		1125	{
		1126	case 0:
		1127	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1128	ta.next = 0;
		1129	break;
		1130
		1131	case 1:
		1132	if (items != 2)
		1133	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1134
		1135	prepare_transfer (&ta, ST (0), ST (1));
		1136	break;
		1137
		1138	case 2:
		1139	prepare_schedule (&ta);
		1140	break;
		1141
		1142	case 3:
		1143	prepare_cede (&ta);
		1144	break;
		1145	}
		1146
		1147	TRANSFER (ta);
		1148	}
800		1149
801	void	1150	void
802	DESTROY(coro)	1151	_clone_state_from (SV *dst, SV *src)
803	Coro::State coro	1152	CODE:
		1153	{
		1154	struct coro *coro_src = SvSTATE (src);
		1155
		1156	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1157
		1158	++coro_src->refcnt;
		1159	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1160	}
		1161
		1162	void
		1163	_exit (code)
		1164	int code
		1165	PROTOTYPE: $
		1166	CODE:
		1167	_exit (code);
		1168
		1169	int
		1170	cctx_count ()
		1171	CODE:
		1172	RETVAL = cctx_count;
		1173	OUTPUT:
		1174	RETVAL
		1175
		1176	int
		1177	cctx_idle ()
		1178	CODE:
		1179	RETVAL = cctx_idle;
		1180	OUTPUT:
		1181	RETVAL
		1182
		1183	MODULE = Coro::State PACKAGE = Coro
		1184
		1185	BOOT:
		1186	{
		1187	int i;
		1188
		1189	coro_stash = gv_stashpv ("Coro", TRUE);
		1190
		1191	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1192	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1193	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1194	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1195	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1196	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1197
		1198	coro_current = get_sv ("Coro::current", FALSE);
		1199	SvREADONLY_on (coro_current);
		1200
		1201	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1202	coro_ready[i] = newAV ();
		1203
		1204	{
		1205	SV *sv = perl_get_sv("Coro::API", 1);
		1206
		1207	coroapi.schedule = api_schedule;
		1208	coroapi.save = api_save;
		1209	coroapi.cede = api_cede;
		1210	coroapi.ready = api_ready;
		1211	coroapi.is_ready = api_is_ready;
		1212	coroapi.nready = &coro_nready;
		1213	coroapi.current = coro_current;
		1214
		1215	GCoroAPI = &coroapi;
		1216	sv_setiv (sv, (IV)&coroapi);
		1217	SvREADONLY_on (sv);
		1218	}
		1219	}
		1220
		1221	void
		1222	_set_current (SV *current)
		1223	PROTOTYPE: $
		1224	CODE:
		1225	SvREFCNT_dec (SvRV (coro_current));
		1226	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1227
		1228	int
		1229	prio (Coro::State coro, int newprio = 0)
		1230	ALIAS:
		1231	nice = 1
804	CODE:	1232	CODE:
		1233	{
		1234	RETVAL = coro->prio;
805		1235
806	if (coro->mainstack && coro->mainstack != main_mainstack)	1236	if (items > 1)
807	{	1237	{
808	struct coro temp;	1238	if (ix)
		1239	newprio += coro->prio;
809		1240
810	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1241	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
811	LOAD(aTHX_ coro);	1242	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
812		1243
813	destroy_stacks (aTHX);	1244	coro->prio = newprio;
814
815	LOAD((&temp)); /* this will get rid of defsv etc.. */
816
817	coro->mainstack = 0;
818	}	1245	}
		1246	}
819		1247
820	deallocate_stack (coro);	1248	SV *
		1249	ready (SV *self)
		1250	PROTOTYPE: $
		1251	CODE:
		1252	RETVAL = boolSV (api_ready (self));
		1253	OUTPUT:
		1254	RETVAL
821		1255
822	Safefree (coro);	1256	SV *
		1257	is_ready (SV *self)
		1258	PROTOTYPE: $
		1259	CODE:
		1260	RETVAL = boolSV (api_is_ready (self));
		1261	OUTPUT:
		1262	RETVAL
		1263
		1264	int
		1265	nready (...)
		1266	PROTOTYPE:
		1267	CODE:
		1268	RETVAL = coro_nready;
		1269	OUTPUT:
		1270	RETVAL
		1271
		1272	MODULE = Coro::State PACKAGE = Coro::AIO
		1273
		1274	SV *
		1275	_get_state ()
		1276	CODE:
		1277	{
		1278	struct io_state *data;
		1279
		1280	RETVAL = newSV (sizeof (struct io_state));
		1281	data = (struct io_state *)SvPVX (RETVAL);
		1282	SvCUR_set (RETVAL, sizeof (struct io_state));
		1283	SvPOK_only (RETVAL);
		1284
		1285	data->errorno = errno;
		1286	data->laststype = PL_laststype;
		1287	data->laststatval = PL_laststatval;
		1288	data->statcache = PL_statcache;
		1289	}
		1290	OUTPUT:
		1291	RETVAL
823		1292
824	void	1293	void
825	flush()	1294	_set_state (char *data_)
		1295	PROTOTYPE: $
826	CODE:	1296	CODE:
827	#ifdef MAY_FLUSH	1297	{
828	flush_padlist_cache ();	1298	struct io_state *data = (void *)data_;
829	#endif
830		1299
831	MODULE = Coro::State PACKAGE = Coro::Cont	1300	errno = data->errorno;
		1301	PL_laststype = data->laststype;
		1302	PL_laststatval = data->laststatval;
		1303	PL_statcache = data->statcache;
		1304	}
832		1305
833	# this is slightly dirty
834
835	void
836	yield(...)
837	PROTOTYPE: @
838	CODE:
839	static SV *returnstk;
840	SV *sv;
841	AV *defav = GvAV (PL_defgv);
842	struct coro *prev, *next;
843
844	if (!returnstk)
845	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
846
847	/* set up @_ -- ugly */
848	av_clear (defav);
849	av_fill (defav, items - 1);
850	while (items--)
851	av_store (defav, items, SvREFCNT_inc (ST(items)));
852
853	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
854	sv = av_pop ((AV *)SvRV (returnstk));
855	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
856	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
857	SvREFCNT_dec (sv);
858
859	transfer(aTHX_ prev, next, 0);
860

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