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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.15 by root, Wed Jul 25 04:14:38 2001 UTC vs.
Revision 1.113 by root, Thu Nov 30 20:54:24 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	#define PERL_VERSION_ATLEAST(a,b,c) \
		14	(PERL_REVISION > (a) \
		15	|| (PERL_REVISION == (a) \
		16	&& (PERL_VERSION > (b) \
		17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		18
		19	#if !PERL_VERSION_ATLEAST (5,6,0)
		20	# ifndef PL_ppaddr
		21	# define PL_ppaddr ppaddr
		22	# endif
		23	# ifndef call_sv
		24	# define call_sv perl_call_sv
		25	# endif
		26	# ifndef get_sv
		27	# define get_sv perl_get_sv
		28	# endif
		29	# ifndef get_cv
		30	# define get_cv perl_get_cv
		31	# endif
		32	# ifndef IS_PADGV
		33	# define IS_PADGV(v) 0
		34	# endif
		35	# ifndef IS_PADCONST
		36	# define IS_PADCONST(v) 0
		37	# endif
		38	#endif
		39
		40	#include <stdio.h>
		41	#include <errno.h>
		42
		43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		44	# undef STACKGUARD
		45	#endif
		46
		47	#ifndef STACKGUARD
		48	# define STACKGUARD 0
		49	#endif
6		50
7	#ifdef HAVE_MMAP	51	#ifdef HAVE_MMAP
8	# include <unistd.h>	52	# include <unistd.h>
9	# include <sys/mman.h>	53	# include <sys/mman.h>
		54	# ifndef MAP_ANONYMOUS
		55	# ifdef MAP_ANON
		56	# define MAP_ANONYMOUS MAP_ANON
		57	# else
		58	# undef HAVE_MMAP
		59	# endif
10	#endif	60	# endif
11		61	# include <limits.h>
12	#define MAY_FLUSH /* increases codesize */	62	# ifndef PAGESIZE
13		63	# define PAGESIZE pagesize
14	/* perl-related */	64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
15	#define TRANSFER_SAVE_DEFAV 0x00000001	65	static long pagesize;
16	#define TRANSFER_SAVE_DEFSV 0x00000002	66	# else
17	#define TRANSFER_SAVE_ERRSV 0x00000004	67	# define BOOT_PAGESIZE (void)0
18	/* c-related */	68	# endif
19	#define TRANSFER_SAVE_CCTXT 0x00000008
20	#ifdef CORO_LAZY_STACK
21	# define TRANSFER_LAZY_STACK 0x00000010
22	#else	69	#else
23	# define TRANSFER_LAZY_STACK 0x00000000	70	# define PAGESIZE 0
		71	# define BOOT_PAGESIZE (void)0
24	#endif	72	#endif
25		73
26	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
27	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
28
29	#define SUB_INIT "Coro::State::initialize"
30	#define UCORO_STATE "_coro_state"
31
32	/* The next macro should delcare a variable stacklevel that contains and approximation	74	/* The next macro should declare a variable stacklevel that contains and approximation
33	* to the current C stack pointer. It's property is that it changes with each call	75	* to the current C stack pointer. Its property is that it changes with each call
34	* and should be unique. */	76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
35	#define dSTACKLEVEL void *stacklevel = &stacklevel	78	#define STACKLEVEL ((void *)&stacklevel)
36		79
37	#define labs(l) ((l) >= 0 ? (l) : -(l))	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
38		81
39	/* this is actually not only the c stack but also c registers etc... */	82	#if __GNUC__ >= 3
		83	# define attribute(x) __attribute__(x)
		84	#else
		85	# define attribute(x)
		86	#endif
		87
		88	#define NOINLINE attribute ((noinline))
		89
		90	#include "CoroAPI.h"
		91
		92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		93
		94	#ifdef USE_ITHREADS
		95	static perl_mutex coro_mutex;
		96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		98	#else
		99	# define LOCK (void)0
		100	# define UNLOCK (void)0
		101	#endif
		102
		103	static struct CoroAPI coroapi;
		104	static AV *main_mainstack; /* used to differentiate between $main and others */
		105	static HV *coro_state_stash, *coro_stash;
		106	static SV *coro_mortal; /* will be freed after next transfer */
		107
		108	static struct coro_cctx *cctx_first;
		109	static int cctx_count, cctx_idle;
		110
		111	/* this is a structure representing a c-level coroutine */
40	typedef struct {	112	typedef struct coro_cctx {
41	int refcnt; /* pointer reference counter */	113	struct coro_cctx *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		114
45	coro_context cctx;	115	/* the stack */
46
47	void *sptr;	116	void *sptr;
48	long ssize; /* positive == mmap, otherwise malloc */	117	long ssize; /* positive == mmap, otherwise malloc */
49	} coro_stack;
50		118
51	static coro_stack main_stack = { 1, 0, 0 };	119	/* cpu state */
		120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		121	JMPENV *top_env;
		122	coro_context cctx;
52		123
		124	int inuse;
		125
		126	#if USE_VALGRIND
		127	int valgrind_id;
		128	#endif
		129	} coro_cctx;
		130
		131	enum {
		132	CF_RUNNING, /* coroutine is running */
		133	CF_READY, /* coroutine is ready */
		134	};
		135
		136	/* this is a structure representing a perl-level coroutine */
53	struct coro {	137	struct coro {
54	/* the optional C context */	138	/* the c coroutine allocated to this perl coroutine, if any */
55	coro_stack *stack;	139	coro_cctx *cctx;
56	void *cursp;	140
		141	/* data associated with this coroutine (initial args) */
		142	AV *args;
57	int gencnt;	143	int refcnt;
		144	int flags;
58		145
59	/* optionally saved, might be zero */	146	/* optionally saved, might be zero */
60	AV *defav;	147	AV *defav;
61	SV *defsv;	148	SV *defsv;
62	SV *errsv;	149	SV *errsv;
63		150
64	/* saved global state not related to stacks */	151	#define VAR(name,type) type name;
65	U8 dowarn;	152	# include "state.h"
		153	#undef VAR
66		154
67	/* the stacks and related info (callchain etc..) */	155	/* coro process data */
68	PERL_SI *curstackinfo;	156	int prio;
69	AV *curstack;
70	AV *mainstack;
71	SV **stack_sp;
72	OP *op;
73	SV **curpad;
74	SV **stack_base;
75	SV **stack_max;
76	SV **tmps_stack;
77	I32 tmps_floor;
78	I32 tmps_ix;
79	I32 tmps_max;
80	I32 *markstack;
81	I32 *markstack_ptr;
82	I32 *markstack_max;
83	I32 *scopestack;
84	I32 scopestack_ix;
85	I32 scopestack_max;
86	ANY *savestack;
87	I32 savestack_ix;
88	I32 savestack_max;
89	OP **retstack;
90	I32 retstack_ix;
91	I32 retstack_max;
92	COP *curcop;
93	JMPENV start_env;
94	JMPENV *top_env;
95
96	/* data associated with this coroutine (initial args) */
97	AV *args;
98	};	157	};
99		158
100	typedef struct coro *Coro__State;	159	typedef struct coro *Coro__State;
101	typedef struct coro *Coro__State_or_hashref;	160	typedef struct coro *Coro__State_or_hashref;
102		161
103	static AV *main_mainstack; /* used to differentiate between $main and others */	162	static AV *
104	static HV *coro_state_stash;	163	coro_clone_padlist (CV *cv)
105	static SV *ucoro_state_sv;
106	static U32 ucoro_state_hash;
107	static HV *padlist_cache;
108
109	/* mostly copied from op.c:cv_clone2 */
110	STATIC AV *
111	clone_padlist (AV *protopadlist)
112	{	164	{
113	AV *av;	165	AV *padlist = CvPADLIST (cv);
114	I32 ix;
115	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
116	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
117	SV **pname = AvARRAY (protopad_name);
118	SV **ppad = AvARRAY (protopad);
119	I32 fname = AvFILLp (protopad_name);
120	I32 fpad = AvFILLp (protopad);
121	AV *newpadlist, *newpad_name, *newpad;	166	AV *newpadlist, *newpad;
122	SV **npad;
123
124	newpad_name = newAV ();
125	for (ix = fname; ix >= 0; ix--)
126	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
127
128	newpad = newAV ();
129	av_fill (newpad, AvFILLp (protopad));
130	npad = AvARRAY (newpad);
131		167
132	newpadlist = newAV ();	168	newpadlist = newAV ();
133	AvREAL_off (newpadlist);	169	AvREAL_off (newpadlist);
134	av_store (newpadlist, 0, (SV *) newpad_name);	170	#if PERL_VERSION_ATLEAST (5,9,0)
		171	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		172	#else
		173	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		174	#endif
		175	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		176	--AvFILLp (padlist);
		177
		178	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
135	av_store (newpadlist, 1, (SV *) newpad);	179	av_store (newpadlist, 1, (SV *)newpad);
136		180
137	av = newAV (); /* will be @_ */	181	return newpadlist;
138	av_extend (av, 0);	182	}
139	av_store (newpad, 0, (SV *) av);
140	AvFLAGS (av) = AVf_REIFY;
141		183
142	for (ix = fpad; ix > 0; ix--)	184	static void
		185	free_padlist (AV *padlist)
		186	{
		187	/* may be during global destruction */
		188	if (SvREFCNT (padlist))
143	{	189	{
144	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	190	I32 i = AvFILLp (padlist);
145	if (namesv && namesv != &PL_sv_undef)	191	while (i >= 0)
146	{	192	{
147	char *name = SvPVX (namesv); /* XXX */	193	SV **svp = av_fetch (padlist, i--, FALSE);
148	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	194	if (svp)
149	{ /* lexical from outside? */
150	npad[ix] = SvREFCNT_inc (ppad[ix]);
151	}	195	{
152	else
153	{ /* our own lexical */
154	SV *sv;	196	SV *sv;
155	if (*name == '&')	197	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
156	sv = SvREFCNT_inc (ppad[ix]);	198	SvREFCNT_dec (sv);
157	else if (*name == '@')	199
158	sv = (SV *) newAV ();	200	SvREFCNT_dec (*svp);
159	else if (*name == '%')
160	sv = (SV *) newHV ();
161	else
162	sv = NEWSV (0, 0);
163	if (!SvPADBUSY (sv))
164	SvPADMY_on (sv);
165	npad[ix] = sv;
166	}	201	}
167	}	202	}
168	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	203
169	{	204	SvREFCNT_dec ((SV*)padlist);
170	npad[ix] = SvREFCNT_inc (ppad[ix]);
171	}
172	else
173	{
174	SV *sv = NEWSV (0, 0);
175	SvPADTMP_on (sv);
176	npad[ix] = sv;
177	}
178	}	205	}
		206	}
179		207
180	#if 0 /* return -ENOTUNDERSTOOD */	208	static int
181	/* Now that vars are all in place, clone nested closures. */	209	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		210	{
		211	AV *padlist;
		212	AV *av = (AV *)mg->mg_obj;
182		213
183	for (ix = fpad; ix > 0; ix--) {	214	/* casting is fun. */
184	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
185	if (namesv	216	free_padlist (padlist);
186	&& namesv != &PL_sv_undef	217
187	&& !(SvFLAGS(namesv) & SVf_FAKE)	218	SvREFCNT_dec (av);
188	&& *SvPVX(namesv) == '&'	219
189	&& CvCLONE(ppad[ix]))	220	return 0;
190	{	221	}
191	CV *kid = cv_clone((CV*)ppad[ix]);	222
192	SvREFCNT_dec(ppad[ix]);	223	#define PERL_MAGIC_coro PERL_MAGIC_ext
193	CvCLONE_on(kid);	224
194	SvPADMY_on(kid);	225	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
195	npad[ix] = (SV*)kid;	226
196	}	227	#define CORO_MAGIC(cv) \
		228	SvMAGIC (cv) \
		229	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		230	? SvMAGIC (cv) \
		231	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		232	: 0
		233
		234	/* the next two functions merely cache the padlists */
		235	static void
		236	get_padlist (CV *cv)
		237	{
		238	MAGIC *mg = CORO_MAGIC (cv);
		239	AV *av;
		240
		241	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		242	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		243	else
		244	{
		245	#if 0
		246	/* this is probably cleaner, but also slower? */
		247	CV *cp = Perl_cv_clone (cv);
		248	CvPADLIST (cv) = CvPADLIST (cp);
		249	CvPADLIST (cp) = 0;
		250	SvREFCNT_dec (cp);
		251	#else
		252	CvPADLIST (cv) = coro_clone_padlist (cv);
		253	#endif
		254	}
		255	}
		256
		257	static void
		258	put_padlist (CV *cv)
		259	{
		260	MAGIC *mg = CORO_MAGIC (cv);
		261	AV *av;
		262
		263	if (!mg)
		264	{
		265	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		266	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		267	mg->mg_virtual = &vtbl_coro;
		268	mg->mg_obj = (SV *)newAV ();
197	}	269	}
198	#endif
199		270
200	return newpadlist;	271	av = (AV *)mg->mg_obj;
201	}
202		272
203	#ifdef MAY_FLUSH	273	if (AvFILLp (av) >= AvMAX (av))
204	STATIC AV *	274	av_extend (av, AvMAX (av) + 1);
205	free_padlist (AV *padlist)
206	{
207	/* may be during global destruction */
208	if (SvREFCNT(padlist))
209	{
210	I32 i = AvFILLp(padlist);
211	while (i >= 0)
212	{
213	SV **svp = av_fetch(padlist, i--, FALSE);
214	SV *sv = svp ? *svp : Nullsv;
215	if (sv)
216	SvREFCNT_dec(sv);
217	}
218		275
219	SvREFCNT_dec((SV*)padlist);	276	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
220	}
221	}	277	}
222	#endif
223
224	/* the next two functions merely cache the padlists */
225	STATIC void
226	get_padlist (CV *cv)
227	{
228	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
229
230	if (he && AvFILLp ((AV *)*he) >= 0)
231	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
232	else
233	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
234	}
235
236	STATIC void
237	put_padlist (CV *cv)
238	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
240
241	if (SvTYPE (*he) != SVt_PVAV)
242	{
243	SvREFCNT_dec (*he);
244	*he = (SV *)newAV ();
245	}
246
247	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
248	}
249
250	#ifdef MAY_FLUSH
251	STATIC void
252	flush_padlist_cache ()
253	{
254	HV *hv = padlist_cache;
255	padlist_cache = newHV ();
256
257	if (hv_iterinit (hv))
258	{
259	HE *he;
260	AV *padlist;
261
262	while (!!(he = hv_iternext (hv)))
263	{
264	AV *av = (AV *)HeVAL(he);
265
266	/* casting is fun. */
267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
268	free_padlist (padlist);
269	}
270	}
271
272	SvREFCNT_dec (hv);
273	}
274	#endif
275		278
276	#define SB do {	279	#define SB do {
277	#define SE } while (0)	280	#define SE } while (0)
278		281
279	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	282	#define LOAD(state) load_state((state));
280	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	283	#define SAVE(state,flags) save_state((state),(flags));
281		284
282	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	285	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
283		286
284	static void	287	static void
285	load_state(pTHX_ Coro__State c)	288	load_state(Coro__State c)
286	{	289	{
287	PL_dowarn = c->dowarn;	290	#define VAR(name,type) PL_ ## name = c->name;
288		291	# include "state.h"
289	PL_curstackinfo = c->curstackinfo;	292	#undef VAR
290	PL_curstack = c->curstack;
291	PL_mainstack = c->mainstack;
292	PL_stack_sp = c->stack_sp;
293	PL_op = c->op;
294	PL_curpad = c->curpad;
295	PL_stack_base = c->stack_base;
296	PL_stack_max = c->stack_max;
297	PL_tmps_stack = c->tmps_stack;
298	PL_tmps_floor = c->tmps_floor;
299	PL_tmps_ix = c->tmps_ix;
300	PL_tmps_max = c->tmps_max;
301	PL_markstack = c->markstack;
302	PL_markstack_ptr = c->markstack_ptr;
303	PL_markstack_max = c->markstack_max;
304	PL_scopestack = c->scopestack;
305	PL_scopestack_ix = c->scopestack_ix;
306	PL_scopestack_max = c->scopestack_max;
307	PL_savestack = c->savestack;
308	PL_savestack_ix = c->savestack_ix;
309	PL_savestack_max = c->savestack_max;
310	PL_retstack = c->retstack;
311	PL_retstack_ix = c->retstack_ix;
312	PL_retstack_max = c->retstack_max;
313	PL_curcop = c->curcop;
314	PL_start_env = c->start_env;
315	PL_top_env = c->top_env;
316		293
317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	294	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	295	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	296	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
320		297
…		…
323	CV *cv;	300	CV *cv;
324		301
325	/* now do the ugly restore mess */	302	/* now do the ugly restore mess */
326	while ((cv = (CV *)POPs))	303	while ((cv = (CV *)POPs))
327	{	304	{
328	AV *padlist = (AV *)POPs;
329
330	if (padlist)
331	{
332	put_padlist (cv); /* mark this padlist as available */	305	put_padlist (cv); /* mark this padlist as available */
333	CvPADLIST(cv) = padlist;	306	CvDEPTH (cv) = PTR2IV (POPs);
334	#ifdef USE_THREADS	307	CvPADLIST (cv) = (AV *)POPs;
335	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
336	#endif
337	}
338
339	++CvDEPTH(cv);
340	}	308	}
341		309
342	PUTBACK;	310	PUTBACK;
343	}	311	}
344	}	312	}
345		313
346	static void	314	static void
347	save_state(pTHX_ Coro__State c, int flags)	315	save_state(Coro__State c, int flags)
348	{	316	{
349	{	317	{
350	dSP;	318	dSP;
351	I32 cxix = cxstack_ix;	319	I32 cxix = cxstack_ix;
352	PERL_CONTEXT *ccstk = cxstack;	320	PERL_CONTEXT *ccstk = cxstack;
…		…
359		327
360	PUSHs (Nullsv);	328	PUSHs (Nullsv);
361	/* this loop was inspired by pp_caller */	329	/* this loop was inspired by pp_caller */
362	for (;;)	330	for (;;)
363	{	331	{
364	do	332	while (cxix >= 0)
365	{	333	{
366	PERL_CONTEXT *cx = &ccstk[cxix--];	334	PERL_CONTEXT *cx = &ccstk[cxix--];
367		335
368	if (CxTYPE(cx) == CXt_SUB)	336	if (CxTYPE(cx) == CXt_SUB)
369	{	337	{
370	CV *cv = cx->blk_sub.cv;	338	CV *cv = cx->blk_sub.cv;
		339
371	if (CvDEPTH(cv))	340	if (CvDEPTH (cv))
372	{	341	{
373	#ifdef USE_THREADS
374	/*XPUSHs ((SV *)CvOWNER(cv));*/
375	/*CvOWNER(cv) = 0;*/
376	/*error must unlock this cv etc.. etc...*/
377	#endif
378	EXTEND (SP, CvDEPTH(cv)*2);	342	EXTEND (SP, 3);
379
380	while (--CvDEPTH(cv))
381	{
382	/* this tells the restore code to increment CvDEPTH */
383	PUSHs (Nullsv);
384	PUSHs ((SV *)cv);
385	}
386		343
387	PUSHs ((SV *)CvPADLIST(cv));	344	PUSHs ((SV *)CvPADLIST(cv));
		345	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
388	PUSHs ((SV *)cv);	346	PUSHs ((SV *)cv);
389		347
		348	CvDEPTH (cv) = 0;
390	get_padlist (cv); /* this is a monster */	349	get_padlist (cv);
391	}	350	}
392	}	351	}
		352	#ifdef CXt_FORMAT
393	else if (CxTYPE(cx) == CXt_FORMAT)	353	else if (CxTYPE(cx) == CXt_FORMAT)
394	{	354	{
395	/* I never used formats, so how should I know how these are implemented? */	355	/* I never used formats, so how should I know how these are implemented? */
396	/* my bold guess is as a simple, plain sub... */	356	/* my bold guess is as a simple, plain sub... */
397	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	357	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
398	}	358	}
		359	#endif
399	}	360	}
400	while (cxix >= 0);
401		361
402	if (top_si->si_type == PERLSI_MAIN)	362	if (top_si->si_type == PERLSI_MAIN)
403	break;	363	break;
404		364
405	top_si = top_si->si_prev;	365	top_si = top_si->si_prev;
…		…
412		372
413	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	373	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
414	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	374	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
415	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	375	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
416		376
417	/* I have not the slightest idea of why av_reify is necessary */	377	#define VAR(name,type)c->name = PL_ ## name;
418	/* but if it's missing the defav contents magically get replaced sometimes */	378	# include "state.h"
419	if (c->defav)	379	#undef VAR
420	av_reify (c->defav);
421
422	c->dowarn = PL_dowarn;
423
424	c->curstackinfo = PL_curstackinfo;
425	c->curstack = PL_curstack;
426	c->mainstack = PL_mainstack;
427	c->stack_sp = PL_stack_sp;
428	c->op = PL_op;
429	c->curpad = PL_curpad;
430	c->stack_base = PL_stack_base;
431	c->stack_max = PL_stack_max;
432	c->tmps_stack = PL_tmps_stack;
433	c->tmps_floor = PL_tmps_floor;
434	c->tmps_ix = PL_tmps_ix;
435	c->tmps_max = PL_tmps_max;
436	c->markstack = PL_markstack;
437	c->markstack_ptr = PL_markstack_ptr;
438	c->markstack_max = PL_markstack_max;
439	c->scopestack = PL_scopestack;
440	c->scopestack_ix = PL_scopestack_ix;
441	c->scopestack_max = PL_scopestack_max;
442	c->savestack = PL_savestack;
443	c->savestack_ix = PL_savestack_ix;
444	c->savestack_max = PL_savestack_max;
445	c->retstack = PL_retstack;
446	c->retstack_ix = PL_retstack_ix;
447	c->retstack_max = PL_retstack_max;
448	c->curcop = PL_curcop;
449	c->start_env = PL_start_env;
450	c->top_env = PL_top_env;
451	}	380	}
452		381
453	/*	382	/*
454	* allocate various perl stacks. This is an exact copy	383	* allocate various perl stacks. This is an exact copy
455	* of perl.c:init_stacks, except that it uses less memory	384	* of perl.c:init_stacks, except that it uses less memory
456	* on the assumption that coroutines do not usually need	385	* on the (sometimes correct) assumption that coroutines do
457	* a lot of stackspace.	386	* not usually need a lot of stackspace.
458	*/	387	*/
459	STATIC void	388	static void
460	coro_init_stacks (pTHX)	389	coro_init_stacks ()
461	{	390	{
462	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	391	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
463	PL_curstackinfo->si_type = PERLSI_MAIN;	392	PL_curstackinfo->si_type = PERLSI_MAIN;
464	PL_curstack = PL_curstackinfo->si_stack;	393	PL_curstack = PL_curstackinfo->si_stack;
465	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	394	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
…		…
475		404
476	New(54,PL_markstack,16,I32);	405	New(54,PL_markstack,16,I32);
477	PL_markstack_ptr = PL_markstack;	406	PL_markstack_ptr = PL_markstack;
478	PL_markstack_max = PL_markstack + 16;	407	PL_markstack_max = PL_markstack + 16;
479		408
		409	#ifdef SET_MARK_OFFSET
480	SET_MARK_OFFSET;	410	SET_MARK_OFFSET;
		411	#endif
481		412
482	New(54,PL_scopestack,16,I32);	413	New(54,PL_scopestack,16,I32);
483	PL_scopestack_ix = 0;	414	PL_scopestack_ix = 0;
484	PL_scopestack_max = 16;	415	PL_scopestack_max = 16;
485		416
486	New(54,PL_savestack,96,ANY);	417	New(54,PL_savestack,96,ANY);
487	PL_savestack_ix = 0;	418	PL_savestack_ix = 0;
488	PL_savestack_max = 96;	419	PL_savestack_max = 96;
489		420
		421	#if !PERL_VERSION_ATLEAST (5,9,0)
490	New(54,PL_retstack,8,OP*);	422	New(54,PL_retstack,8,OP*);
491	PL_retstack_ix = 0;	423	PL_retstack_ix = 0;
492	PL_retstack_max = 8;	424	PL_retstack_max = 8;
		425	#endif
493	}	426	}
494		427
495	/*	428	/*
496	* destroy the stacks, the callchain etc...	429	* destroy the stacks, the callchain etc...
497	* still there is a memleak of 128 bytes...
498	*/	430	*/
499	STATIC void	431	static void
500	destroy_stacks(pTHX)	432	coro_destroy_stacks ()
501	{	433	{
		434	if (!IN_DESTRUCT)
		435	{
502	/* is this ugly, I ask? */	436	/* is this ugly, I ask? */
503	while (PL_scopestack_ix)	437	LEAVE_SCOPE (0);
504	LEAVE;
505		438
506	/* sure it is, but more important: is it correct?? :/ */	439	/* sure it is, but more important: is it correct?? :/ */
507	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
508	FREETMPS;	440	FREETMPS;
		441
		442	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		443	}
509		444
510	while (PL_curstackinfo->si_next)	445	while (PL_curstackinfo->si_next)
511	PL_curstackinfo = PL_curstackinfo->si_next;	446	PL_curstackinfo = PL_curstackinfo->si_next;
512		447
513	while (PL_curstackinfo)	448	while (PL_curstackinfo)
514	{	449	{
515	PERL_SI *p = PL_curstackinfo->si_prev;	450	PERL_SI *p = PL_curstackinfo->si_prev;
516		451
517	{	452	{ /*D*//*remove*/
518	dSP;	453	dSP;
519	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	454	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
520	PUTBACK; /* possibly superfluous */	455	PUTBACK; /* possibly superfluous */
521	}	456	}
522		457
523	dounwind(-1);	458	if (!IN_DESTRUCT)
524		459	{
		460	dounwind (-1);/*D*//*remove*/
525	SvREFCNT_dec(PL_curstackinfo->si_stack);	461	SvREFCNT_dec (PL_curstackinfo->si_stack);
		462	}
		463
526	Safefree(PL_curstackinfo->si_cxstack);	464	Safefree (PL_curstackinfo->si_cxstack);
527	Safefree(PL_curstackinfo);	465	Safefree (PL_curstackinfo);
528	PL_curstackinfo = p;	466	PL_curstackinfo = p;
529	}	467	}
530		468
531	Safefree(PL_tmps_stack);	469	Safefree (PL_tmps_stack);
532	Safefree(PL_markstack);	470	Safefree (PL_markstack);
533	Safefree(PL_scopestack);	471	Safefree (PL_scopestack);
534	Safefree(PL_savestack);	472	Safefree (PL_savestack);
		473	#if !PERL_VERSION_ATLEAST (5,9,0)
535	Safefree(PL_retstack);	474	Safefree (PL_retstack);
536	}
537
538	static void
539	allocate_stack (Coro__State ctx, int alloc)
540	{
541	coro_stack *stack;
542
543	New (0, stack, 1, coro_stack);
544
545	stack->refcnt = 1;
546	stack->usecnt = 1;
547	stack->gencnt = ctx->gencnt = 0;
548	if (alloc)
549	{
550	#ifdef HAVE_MMAP
551	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
552	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
553	if (stack->sptr == (void *)-1)
554	#endif	475	#endif
555	{
556	/*FIXME*//*D*//* reasonable stack size! */
557	stack->ssize = -4096 * sizeof (long);
558	New (0, stack->sptr, 4096, long);
559	}
560	}
561	else
562	stack->sptr = 0;
563
564	ctx->stack = stack;
565	}	476	}
566		477
567	static void	478	static void
568	deallocate_stack (Coro__State ctx)	479	setup_coro (struct coro *coro)
569	{
570	coro_stack *stack = ctx->stack;
571
572	ctx->stack = 0;
573
574	if (stack)
575	{
576	if (!--stack->refcnt)
577	{
578	#ifdef HAVE_MMAP
579	if (stack->ssize > 0 && stack->sptr)
580	munmap (stack->sptr, stack->ssize);
581	else
582	#else
583	Safefree (stack->sptr);
584	#endif
585	Safefree (stack);
586	}
587	else if (ctx->gencnt == stack->gencnt)
588	--stack->usecnt;
589	}
590	}
591
592	static void
593	setup_coro (void *arg)
594	{	480	{
595	/*	481	/*
596	* emulate part of the perl startup here.	482	* emulate part of the perl startup here.
597	*/	483	*/
		484
		485	coro_init_stacks ();
		486
		487	PL_curcop = 0;
		488	PL_in_eval = 0;
		489	PL_curpm = 0;
		490
		491	{
		492	dSP;
		493	LOGOP myop;
		494
		495	/* I have no idea why this is needed, but it is */
		496	PUSHMARK (SP);
		497
		498	SvREFCNT_dec (GvAV (PL_defgv));
		499	GvAV (PL_defgv) = coro->args; coro->args = 0;
		500
		501	Zero (&myop, 1, LOGOP);
		502	myop.op_next = Nullop;
		503	myop.op_flags = OPf_WANT_VOID;
		504
		505	PL_op = (OP *)&myop;
		506
		507	PUSHMARK (SP);
		508	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		509	PUTBACK;
		510	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		511	SPAGAIN;
		512
		513	ENTER; /* necessary e.g. for dounwind */
		514	}
		515	}
		516
		517	static void
		518	free_coro_mortal ()
		519	{
		520	if (coro_mortal)
		521	{
		522	SvREFCNT_dec (coro_mortal);
		523	coro_mortal = 0;
		524	}
		525	}
		526
		527	static void NOINLINE
		528	prepare_cctx (coro_cctx *cctx)
		529	{
598	dSP;	530	dSP;
599	Coro__State ctx = (Coro__State)arg;	531	LOGOP myop;
600	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
601		532
602	coro_init_stacks (aTHX);	533	Zero (&myop, 1, LOGOP);
603	JMPENV_BOOTSTRAP;	534	myop.op_next = PL_op;
		535	myop.op_flags = OPf_WANT_VOID;
		536
		537	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		538
		539	PUSHMARK (SP);
		540	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		541	PUTBACK;
		542	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
604	SPAGAIN;	543	SPAGAIN;
605
606	/*PL_curcop = 0;*/
607	SvREFCNT_dec (GvAV (PL_defgv));
608	GvAV (PL_defgv) = ctx->args;
609
610	if (ctx->stack)
611	{
612	ctx->cursp = 0;
613
614	PUSHMARK(SP);
615	PUTBACK;
616	(void) call_sv (sub_init, G_VOID|G_NOARGS);
617	croak ("FATAL: CCTXT coroutine returned!");
618	}
619	else
620	{
621	UNOP myop;
622
623	PL_op = (OP *)&myop;
624
625	Zero(&myop, 1, UNOP);
626	myop.op_next = Nullop;
627	myop.op_flags = OPf_WANT_VOID;
628
629	PUSHMARK(SP);
630	XPUSHs (sub_init);
631	/*
632	* the next line is slightly wrong, as PL_op->op_next
633	* is actually being executed so we skip the first op.
634	* that doesn't matter, though, since it is only
635	* pp_nextstate and we never return...
636	* ah yes, and I don't care anyways ;)
637	*/
638	PUTBACK;
639	PL_op = pp_entersub();
640	SPAGAIN;
641
642	ENTER; /* necessary e.g. for dounwind */
643	}
644	}	544	}
645		545
646	static void	546	static void
647	continue_coro (void *arg)	547	coro_run (void *arg)
648	{	548	{
		549	/* coro_run is the alternative epilogue of transfer() */
		550	UNLOCK;
		551
649	/*	552	/*
650	* this is a _very_ stripped down perl interpreter ;)	553	* this is a _very_ stripped down perl interpreter ;)
651	*/	554	*/
652	Coro__State ctx = (Coro__State)arg;	555	PL_top_env = &PL_start_env;
653		556
654	ctx->cursp = 0;	557	/* inject call to cctx_init */
655	PL_op = PL_op->op_next;	558	prepare_cctx ((coro_cctx *)arg);
656	CALLRUNOPS(aTHX);	559
657	/*NORETURN*/	560	/* somebody will hit me for both perl_run and PL_restartop */
		561	perl_run (PL_curinterp);
		562
		563	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
658	abort ();	564	abort ();
659	}	565	}
660		566
661	STATIC void	567	static coro_cctx *
		568	cctx_new ()
		569	{
		570	coro_cctx *cctx;
		571
		572	++cctx_count;
		573
		574	New (0, cctx, 1, coro_cctx);
		575
		576	#if HAVE_MMAP
		577
		578	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		579	/* mmap suppsedly does allocate-on-write for us */
		580	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		581
		582	if (cctx->sptr == (void *)-1)
		583	{
		584	perror ("FATAL: unable to mmap stack for coroutine");
		585	_exit (EXIT_FAILURE);
		586	}
		587
		588	# if STACKGUARD
		589	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		590	# endif
		591
		592	#else
		593
		594	cctx->ssize = STACKSIZE * (long)sizeof (long);
		595	New (0, cctx->sptr, STACKSIZE, long);
		596
		597	if (!cctx->sptr)
		598	{
		599	perror ("FATAL: unable to malloc stack for coroutine");
		600	_exit (EXIT_FAILURE);
		601	}
		602
		603	#endif
		604
		605	#if USE_VALGRIND
		606	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		607	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		608	cctx->ssize + (char *)cctx->sptr
		609	);
		610	#endif
		611
		612	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		613
		614	return cctx;
		615	}
		616
		617	static void
		618	cctx_free (coro_cctx *cctx)
		619	{
		620	if (!cctx)
		621	return;
		622
		623	--cctx_count;
		624
		625	#if USE_VALGRIND
		626	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		627	#endif
		628
		629	#if HAVE_MMAP
		630	munmap (cctx->sptr, cctx->ssize);
		631	#else
		632	Safefree (cctx->sptr);
		633	#endif
		634
		635	Safefree (cctx);
		636	}
		637
		638	static coro_cctx *
		639	cctx_get ()
		640	{
		641	coro_cctx *cctx;
		642
		643	if (cctx_first)
		644	{
		645	--cctx_idle;
		646	cctx = cctx_first;
		647	cctx_first = cctx->next;
		648	}
		649	else
		650	{
		651	cctx = cctx_new ();
		652	PL_op = PL_op->op_next;
		653	}
		654
		655	return cctx;
		656	}
		657
		658	static void
		659	cctx_put (coro_cctx *cctx)
		660	{
		661	++cctx_idle;
		662	cctx->next = cctx_first;
		663	cctx_first = cctx;
		664	}
		665
		666	/* never call directly, always through the coro_state_transfer global variable */
		667	static void NOINLINE
662	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	668	transfer (struct coro *prev, struct coro *next, int flags)
663	{	669	{
664	dSP;
665	dSTACKLEVEL;	670	dSTACKLEVEL;
666		671
		672	/* sometimes transfer is only called to set idle_sp */
		673	if (flags == TRANSFER_SET_STACKLEVEL)
		674	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
667	if (prev != next)	675	else if (prev != next)
668	{	676	{
		677	coro_cctx *prev__cctx;
		678
		679	if (!prev->cctx)
		680	{
		681	/* create a new empty context */
		682	Newz (0, prev->cctx, 1, coro_cctx);
		683	prev->cctx->inuse = 1;
		684	prev->flags |= CF_RUNNING;
		685	}
		686
		687	if (!prev->flags & CF_RUNNING)
		688	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		689
		690	if (next->flags & CF_RUNNING)
		691	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		692
		693	prev->flags &= ~CF_RUNNING;
		694	next->flags |= CF_RUNNING;
		695
		696	LOCK;
		697
669	if (next->mainstack)	698	if (next->mainstack)
670	{	699	{
		700	/* coroutine already started */
671	SAVE (prev, flags);	701	SAVE (prev, flags);
672	LOAD (next);	702	LOAD (next);
673
674	/* mark this state as in-use */
675	next->mainstack = 0;
676	next->tmps_ix = -2;
677
678	/* stacklevel changed? if yes, grab the stack for us! */
679	if (flags & TRANSFER_SAVE_CCTXT)
680	{
681	if (!prev->stack)
682	allocate_stack (prev, 0);
683	else if (prev->cursp != stacklevel
684	&& prev->stack->usecnt > 1)
685	{
686	prev->gencnt = ++prev->stack->gencnt;
687	prev->stack->usecnt = 1;
688	}
689
690	/* has our stack been invalidated? */
691	if (next->stack && next->stack->gencnt != next->gencnt)
692	{
693	deallocate_stack (next);
694	allocate_stack (next, 1);
695	coro_create (&(next->stack->cctx),
696	continue_coro, (void *)next,
697	next->stack->sptr, labs (next->stack->ssize));
698	}
699
700	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
701	}
702
703	}	703	}
704	else if (next->tmps_ix == -2)
705	croak ("tried to transfer to running coroutine");
706	else	704	else
707	{	705	{
		706	/* need to start coroutine */
708	SAVE (prev, -1); /* first get rid of the old state */	707	/* first get rid of the old state */
709		708	SAVE (prev, -1);
710	if (flags & TRANSFER_SAVE_CCTXT)	709	/* setup coroutine call */
711	{
712	if (!prev->stack)
713	allocate_stack (prev, 0);
714
715	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
716	{
717	setup_coro (next);
718
719	prev->stack->refcnt++;
720	prev->stack->usecnt++;
721	next->stack = prev->stack;
722	next->gencnt = prev->gencnt;
723	}
724	else
725	{
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	setup_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
731	}
732	}
733	else
734	setup_coro (next);	710	setup_coro (next);
		711	/* need a new stack */
		712	assert (!next->stack);
735	}	713	}
		714
		715	prev__cctx = prev->cctx;
		716
		717	/* possibly "free" the cctx */
		718	if (prev__cctx->idle_sp == STACKLEVEL)
		719	{
		720	assert (PL_top_env == prev__cctx->top_env);
		721
		722	cctx_put (prev__cctx);
		723	prev->cctx = 0;
		724	}
		725	else if (prev__cctx->idle_sp) //D
		726	fprintf (stderr, "coro %p has own stack %p-%p\n", prev__cctx, prev__cctx->idle_sp, STACKLEVEL);//D
		727
		728	if (!next->cctx)
		729	next->cctx = cctx_get ();
		730
		731	if (prev__cctx != next->cctx)
		732	{
		733	assert ( prev__cctx->inuse);
		734	assert (!next->cctx->inuse);
		735
		736	prev__cctx->inuse = 0;
		737	next->cctx->inuse = 1;
		738
		739	prev__cctx->top_env = PL_top_env;
		740	PL_top_env = next->cctx->top_env;
		741	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		742	}
		743
		744	free_coro_mortal ();
		745
		746	UNLOCK;
736	}	747	}
		748	}
737		749
738	next->cursp = stacklevel;	750	struct transfer_args
		751	{
		752	struct coro *prev, *next;
		753	int flags;
		754	};
		755
		756	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		757
		758	static void
		759	coro_state_destroy (struct coro *coro)
		760	{
		761	if (coro->refcnt--)
		762	return;
		763
		764	if (coro->flags & CF_RUNNING)
		765	croak ("FATAL: tried to destroy currently running coroutine");
		766
		767	if (coro->mainstack && coro->mainstack != main_mainstack)
		768	{
		769	struct coro temp;
		770
		771	SAVE ((&temp), TRANSFER_SAVE_ALL);
		772	LOAD (coro);
		773
		774	coro_destroy_stacks ();
		775
		776	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		777
		778	coro->mainstack = 0;
		779	}
		780
		781	cctx_free (coro->cctx);
		782	SvREFCNT_dec (coro->args);
		783	Safefree (coro);
		784	}
		785
		786	static int
		787	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		788	{
		789	struct coro *coro = (struct coro *)mg->mg_ptr;
		790	mg->mg_ptr = 0;
		791
		792	coro_state_destroy (coro);
		793
		794	return 0;
		795	}
		796
		797	static int
		798	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		799	{
		800	struct coro *coro = (struct coro *)mg->mg_ptr;
		801
		802	++coro->refcnt;
		803
		804	return 0;
		805	}
		806
		807	static MGVTBL coro_state_vtbl = {
		808	0, 0, 0, 0,
		809	coro_state_clear,
		810	0,
		811	#ifdef MGf_DUP
		812	coro_state_dup,
		813	#else
		814	# define MGf_DUP 0
		815	#endif
		816	};
		817
		818	static struct coro *
		819	SvSTATE (SV *coro)
		820	{
		821	HV *stash;
		822	MAGIC *mg;
		823
		824	if (SvROK (coro))
		825	coro = SvRV (coro);
		826
		827	stash = SvSTASH (coro);
		828	if (stash != coro_stash && stash != coro_state_stash)
		829	{
		830	/* very slow, but rare, check */
		831	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		832	croak ("Coro::State object required");
		833	}
		834
		835	mg = SvMAGIC (coro);
		836	assert (mg->mg_type == PERL_MAGIC_ext);
		837	return (struct coro *)mg->mg_ptr;
		838	}
		839
		840	static void
		841	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		842	{
		843	ta->prev = SvSTATE (prev);
		844	ta->next = SvSTATE (next);
		845	ta->flags = flags;
		846	}
		847
		848	static void
		849	api_transfer (SV *prev, SV *next, int flags)
		850	{
		851	dTHX;
		852	struct transfer_args ta;
		853
		854	prepare_transfer (&ta, prev, next, flags);
		855	TRANSFER (ta);
		856	}
		857
		858	/** Coro ********************************************************************/
		859
		860	#define PRIO_MAX 3
		861	#define PRIO_HIGH 1
		862	#define PRIO_NORMAL 0
		863	#define PRIO_LOW -1
		864	#define PRIO_IDLE -3
		865	#define PRIO_MIN -4
		866
		867	/* for Coro.pm */
		868	static GV *coro_current, *coro_idle;
		869	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		870	static int coro_nready;
		871
		872	static void
		873	coro_enq (SV *coro_sv)
		874	{
		875	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		876	coro_nready++;
		877	}
		878
		879	static SV *
		880	coro_deq (int min_prio)
		881	{
		882	int prio = PRIO_MAX - PRIO_MIN;
		883
		884	min_prio -= PRIO_MIN;
		885	if (min_prio < 0)
		886	min_prio = 0;
		887
		888	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		889	if (AvFILLp (coro_ready [prio]) >= 0)
		890	{
		891	coro_nready--;
		892	return av_shift (coro_ready [prio]);
		893	}
		894
		895	return 0;
		896	}
		897
		898	static int
		899	api_ready (SV *coro_sv)
		900	{
		901	struct coro *coro;
		902
		903	if (SvROK (coro_sv))
		904	coro_sv = SvRV (coro_sv);
		905
		906	coro = SvSTATE (coro_sv);
		907
		908	if (coro->flags & CF_READY)
		909	return 0;
		910
		911	if (coro->flags & CF_RUNNING)
		912	croak ("Coro::ready called on currently running coroutine");
		913
		914	coro->flags |= CF_READY;
		915
		916	LOCK;
		917	coro_enq (SvREFCNT_inc (coro_sv));
		918	UNLOCK;
		919
		920	return 1;
		921	}
		922
		923	static int
		924	api_is_ready (SV *coro_sv)
		925	{
		926	return !!SvSTATE (coro_sv)->flags & CF_READY;
		927	}
		928
		929	static void
		930	prepare_schedule (struct transfer_args *ta)
		931	{
		932	SV *current, *prev, *next;
		933
		934	current = GvSV (coro_current);
		935
		936	for (;;)
		937	{
		938	LOCK;
		939	next = coro_deq (PRIO_MIN);
		940	UNLOCK;
		941
		942	if (next)
		943	break;
		944
		945	{
		946	dSP;
		947
		948	ENTER;
		949	SAVETMPS;
		950
		951	PUSHMARK (SP);
		952	PUTBACK;
		953	call_sv (GvSV (coro_idle), G_DISCARD);
		954
		955	FREETMPS;
		956	LEAVE;
		957	}
		958	}
		959
		960	prev = SvRV (current);
		961	SvRV (current) = next;
		962
		963	/* free this only after the transfer */
		964	LOCK;
		965	free_coro_mortal ();
		966	UNLOCK;
		967	coro_mortal = prev;
		968
		969	ta->prev = SvSTATE (prev);
		970	ta->next = SvSTATE (next);
		971	ta->flags = TRANSFER_SAVE_ALL;
		972
		973	ta->next->flags &= ~CF_READY;
		974	}
		975
		976	static void
		977	prepare_cede (struct transfer_args *ta)
		978	{
		979	api_ready (GvSV (coro_current));
		980
		981	prepare_schedule (ta);
		982	}
		983
		984	static void
		985	api_schedule (void)
		986	{
		987	dTHX;
		988	struct transfer_args ta;
		989
		990	prepare_schedule (&ta);
		991	TRANSFER (ta);
		992	}
		993
		994	static void
		995	api_cede (void)
		996	{
		997	dTHX;
		998	struct transfer_args ta;
		999
		1000	prepare_cede (&ta);
		1001	TRANSFER (ta);
739	}	1002	}
740		1003
741	MODULE = Coro::State PACKAGE = Coro::State	1004	MODULE = Coro::State PACKAGE = Coro::State
742		1005
743	PROTOTYPES: ENABLE	1006	PROTOTYPES: DISABLE
744		1007
745	BOOT:	1008	BOOT:
746	{ /* {} necessary for stoopid perl-5.6.x */	1009	{
747	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1010	#ifdef USE_ITHREADS
748	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1011	MUTEX_INIT (&coro_mutex);
		1012	#endif
		1013	BOOT_PAGESIZE;
		1014
749	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1015	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
750		1016
751	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1017	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
752	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1018	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
753	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1019	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
754	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
755
756	if (!padlist_cache)
757	padlist_cache = newHV ();
758		1020
759	main_mainstack = PL_mainstack;	1021	main_mainstack = PL_mainstack;
760	}
761		1022
762	Coro::State	1023	coroapi.ver = CORO_API_VERSION;
763	_newprocess(args)	1024	coroapi.transfer = api_transfer;
764	SV * args	1025
765	PROTOTYPE: $	1026	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1027	}
		1028
		1029	SV *
		1030	new (char *klass, ...)
766	CODE:	1031	CODE:
767	Coro__State coro;	1032	{
		1033	struct coro *coro;
		1034	HV *hv;
		1035	int i;
768		1036
769	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
770	croak ("Coro::State::_newprocess expects an arrayref");
771
772	New (0, coro, 1, struct coro);	1037	Newz (0, coro, 1, struct coro);
		1038	coro->args = newAV ();
773		1039
774	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1040	hv = newHV ();
775	coro->mainstack = 0; /* actual work is done inside transfer */	1041	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
776	coro->stack = 0;	1042	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
777		1043
778	RETVAL = coro;	1044	for (i = 1; i < items; i++)
		1045	av_push (coro->args, newSVsv (ST (i)));
		1046	}
779	OUTPUT:	1047	OUTPUT:
780	RETVAL	1048	RETVAL
781		1049
782	void	1050	void
783	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1051	_set_stacklevel (...)
784	Coro::State_or_hashref prev	1052	ALIAS:
785	Coro::State_or_hashref next	1053	Coro::State::transfer = 1
786	int flags	1054	Coro::schedule = 2
787	PROTOTYPE: @	1055	Coro::cede = 3
		1056	Coro::Cont::yield = 4
788	CODE:	1057	CODE:
789	transfer (aTHX_ prev, next, flags);	1058	{
		1059	struct transfer_args ta;
		1060
		1061	switch (ix)
		1062	{
		1063	case 0:
		1064	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1065	ta.next = 0;
		1066	ta.flags = TRANSFER_SET_STACKLEVEL;
		1067	break;
		1068
		1069	case 1:
		1070	if (items != 3)
		1071	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1072
		1073	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1074	break;
		1075
		1076	case 2:
		1077	prepare_schedule (&ta);
		1078	break;
		1079
		1080	case 3:
		1081	prepare_cede (&ta);
		1082	break;
		1083
		1084	case 4:
		1085	{
		1086	SV *yieldstack;
		1087	SV *sv;
		1088	AV *defav = GvAV (PL_defgv);
		1089
		1090	yieldstack = *hv_fetch (
		1091	(HV *)SvRV (GvSV (coro_current)),
		1092	"yieldstack", sizeof ("yieldstack") - 1,
		1093	0
		1094	);
		1095
		1096	/* set up @_ -- ugly */
		1097	av_clear (defav);
		1098	av_fill (defav, items - 1);
		1099	while (items--)
		1100	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1101
		1102	sv = av_pop ((AV *)SvRV (yieldstack));
		1103	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1104	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1105	ta.flags = 0;
		1106	SvREFCNT_dec (sv);
		1107	}
		1108	break;
		1109
		1110	}
		1111
		1112	TRANSFER (ta);
		1113	}
790		1114
791	void	1115	void
792	DESTROY(coro)	1116	_clone_state_from (SV *dst, SV *src)
793	Coro::State coro	1117	CODE:
		1118	{
		1119	struct coro *coro_src = SvSTATE (src);
		1120
		1121	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1122
		1123	++coro_src->refcnt;
		1124	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1125	}
		1126
		1127	void
		1128	_exit (code)
		1129	int code
		1130	PROTOTYPE: $
		1131	CODE:
		1132	_exit (code);
		1133
		1134	int
		1135	cctx_count ()
		1136	CODE:
		1137	RETVAL = cctx_count;
		1138	OUTPUT:
		1139	RETVAL
		1140
		1141	int
		1142	cctx_idle ()
		1143	CODE:
		1144	RETVAL = cctx_idle;
		1145	OUTPUT:
		1146	RETVAL
		1147
		1148	MODULE = Coro::State PACKAGE = Coro
		1149
		1150	BOOT:
		1151	{
		1152	int i;
		1153
		1154	coro_stash = gv_stashpv ("Coro", TRUE);
		1155
		1156	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1157	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1158	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1159	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1160	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1161	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1162
		1163	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1164	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1165
		1166	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1167	coro_ready[i] = newAV ();
		1168
		1169	{
		1170	SV *sv = perl_get_sv("Coro::API", 1);
		1171
		1172	coroapi.schedule = api_schedule;
		1173	coroapi.cede = api_cede;
		1174	coroapi.ready = api_ready;
		1175	coroapi.is_ready = api_is_ready;
		1176	coroapi.nready = &coro_nready;
		1177	coroapi.current = coro_current;
		1178
		1179	GCoroAPI = &coroapi;
		1180	sv_setiv (sv, (IV)&coroapi);
		1181	SvREADONLY_on (sv);
		1182	}
		1183	}
		1184
		1185	int
		1186	prio (Coro::State coro, int newprio = 0)
		1187	ALIAS:
		1188	nice = 1
794	CODE:	1189	CODE:
		1190	{
		1191	RETVAL = coro->prio;
795		1192
796	if (coro->mainstack && coro->mainstack != main_mainstack)	1193	if (items > 1)
797	{	1194	{
798	struct coro temp;	1195	if (ix)
		1196	newprio += coro->prio;
799		1197
800	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1198	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
801	LOAD(aTHX_ coro);	1199	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
802		1200
803	destroy_stacks (aTHX);	1201	coro->prio = newprio;
804
805	LOAD((&temp)); /* this will get rid of defsv etc.. */
806
807	coro->mainstack = 0;
808	}	1202	}
		1203	}
809		1204
810	deallocate_stack (coro);	1205	SV *
		1206	ready (SV *self)
		1207	PROTOTYPE: $
		1208	CODE:
		1209	RETVAL = boolSV (api_ready (self));
		1210	OUTPUT:
		1211	RETVAL
811		1212
812	Safefree (coro);	1213	SV *
		1214	is_ready (SV *self)
		1215	PROTOTYPE: $
		1216	CODE:
		1217	RETVAL = boolSV (api_is_ready (self));
		1218	OUTPUT:
		1219	RETVAL
		1220
		1221	int
		1222	nready (...)
		1223	PROTOTYPE:
		1224	CODE:
		1225	RETVAL = coro_nready;
		1226	OUTPUT:
		1227	RETVAL
		1228
		1229	MODULE = Coro::State PACKAGE = Coro::AIO
		1230
		1231	SV *
		1232	_get_state ()
		1233	CODE:
		1234	{
		1235	struct {
		1236	int errorno;
		1237	int laststype;
		1238	int laststatval;
		1239	Stat_t statcache;
		1240	} data;
		1241
		1242	data.errorno = errno;
		1243	data.laststype = PL_laststype;
		1244	data.laststatval = PL_laststatval;
		1245	data.statcache = PL_statcache;
		1246
		1247	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1248	}
		1249	OUTPUT:
		1250	RETVAL
813		1251
814	void	1252	void
815	flush()	1253	_set_state (char *data_)
		1254	PROTOTYPE: $
816	CODE:	1255	CODE:
817	#ifdef MAY_FLUSH	1256	{
818	flush_padlist_cache ();	1257	struct {
819	#endif	1258	int errorno;
		1259	int laststype;
		1260	int laststatval;
		1261	Stat_t statcache;
		1262	} *data = (void *)data_;
820		1263
821	MODULE = Coro::State PACKAGE = Coro::Cont	1264	errno = data->errorno;
822		1265	PL_laststype = data->laststype;
823	# this is slightly dirty	1266	PL_laststatval = data->laststatval;
824		1267	PL_statcache = data->statcache;
825	void	1268	}
826	yield(...)
827	PROTOTYPE: @
828	CODE:
829	static SV *returnstk;
830	SV *sv;
831	AV *defav = GvAV (PL_defgv);
832	struct coro *prev, *next;
833
834	if (!returnstk)
835	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
836
837	/* set up @_ -- ugly */
838	av_clear (defav);
839	av_fill (defav, items - 1);
840	while (items--)
841	av_store (defav, items, SvREFCNT_inc (ST(items)));
842
843	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
844	sv = av_pop ((AV *)SvRV (returnstk));
845	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
846	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
847	SvREFCNT_dec (sv);
848
849	transfer(aTHX_ prev, next, 0);
850

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