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Comparing Coro/Coro/State.xs (file contents):
Revision 1.21 by root, Sat Aug 11 19:59:19 2001 UTC vs.
Revision 1.112 by root, Thu Nov 30 20:52:52 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"
6		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
7	#include <signal.h>	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
8		50
9	#ifdef HAVE_MMAP	51	#ifdef HAVE_MMAP
10	# include <unistd.h>	52	# include <unistd.h>
11	# include <sys/mman.h>	53	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	54	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	55	# ifdef MAP_ANON
		56	# define MAP_ANONYMOUS MAP_ANON
15	# else	57	# else
16	# undef HAVE_MMAP	58	# undef HAVE_MMAP
17	# endif	59	# endif
18	# endif	60	# endif
		61	# include <limits.h>
		62	# ifndef PAGESIZE
		63	# define PAGESIZE pagesize
		64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		65	static long pagesize;
		66	# else
		67	# define BOOT_PAGESIZE (void)0
19	#endif	68	# endif
20
21	#define MAY_FLUSH /* increases codesize */
22
23	/* perl-related */
24	#define TRANSFER_SAVE_DEFAV 0x00000001
25	#define TRANSFER_SAVE_DEFSV 0x00000002
26	#define TRANSFER_SAVE_ERRSV 0x00000004
27	/* c-related */
28	#define TRANSFER_SAVE_CCTXT 0x00000008
29	#ifdef CORO_LAZY_STACK
30	# define TRANSFER_LAZY_STACK 0x00000010
31	#else	69	#else
32	# define TRANSFER_LAZY_STACK 0x00000000	70	# define PAGESIZE 0
		71	# define BOOT_PAGESIZE (void)0
33	#endif	72	#endif
34		73
35	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
36	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
37
38	#define SUB_INIT "Coro::State::initialize"
39	#define UCORO_STATE "_coro_state"
40
41	/* 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
42	* 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
43	* and should be unique. */	76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
44	#define dSTACKLEVEL void *stacklevel = &stacklevel	78	#define STACKLEVEL ((void *)&stacklevel)
45		79
46	#define labs(l) ((l) >= 0 ? (l) : -(l))	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
47		81
48	/* 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 */
49	typedef struct {	112	typedef struct coro_cctx {
50	int refcnt; /* pointer reference counter */	113	struct coro_cctx *next;
51	int usecnt; /* shared by how many coroutines */
52	int gencnt; /* generation counter */
53		114
54	coro_context cctx;	115	/* the stack */
55
56	void *sptr;	116	void *sptr;
57	long ssize; /* positive == mmap, otherwise malloc */	117	long ssize; /* positive == mmap, otherwise malloc */
58	} coro_stack;
59		118
		119	/* cpu state */
		120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		121	JMPENV *top_env;
		122	coro_context cctx;
		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 */
60	struct coro {	137	struct coro {
61	/* the optional C context */	138	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	139	coro_cctx *cctx;
63	void *cursp;	140
		141	/* data associated with this coroutine (initial args) */
		142	AV *args;
64	int gencnt;	143	int refcnt;
		144	int flags;
65		145
66	/* optionally saved, might be zero */	146	/* optionally saved, might be zero */
67	AV *defav;	147	AV *defav;
68	SV *defsv;	148	SV *defsv;
69	SV *errsv;	149	SV *errsv;
70		150
71	/* saved global state not related to stacks */	151	#define VAR(name,type) type name;
72	U8 dowarn;	152	# include "state.h"
73	I32 in_eval;	153	#undef VAR
74		154
75	/* the stacks and related info (callchain etc..) */	155	/* coro process data */
76	PERL_SI *curstackinfo;	156	int prio;
77	AV *curstack;
78	AV *mainstack;
79	SV **stack_sp;
80	OP *op;
81	SV **curpad;
82	SV **stack_base;
83	SV **stack_max;
84	SV **tmps_stack;
85	I32 tmps_floor;
86	I32 tmps_ix;
87	I32 tmps_max;
88	I32 *markstack;
89	I32 *markstack_ptr;
90	I32 *markstack_max;
91	I32 *scopestack;
92	I32 scopestack_ix;
93	I32 scopestack_max;
94	ANY *savestack;
95	I32 savestack_ix;
96	I32 savestack_max;
97	OP **retstack;
98	I32 retstack_ix;
99	I32 retstack_max;
100	COP *curcop;
101	JMPENV *top_env;
102
103	/* data associated with this coroutine (initial args) */
104	AV *args;
105	};	157	};
106		158
107	typedef struct coro *Coro__State;	159	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	160	typedef struct coro *Coro__State_or_hashref;
109		161
110	static AV *main_mainstack; /* used to differentiate between $main and others */	162	static AV *
111	static HV *coro_state_stash;	163	coro_clone_padlist (CV *cv)
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115
116	/* for Coro.pm */
117	static GV *coro_current, *coro_idle;
118	static AV *coro_ready;
119
120	/* mostly copied from op.c:cv_clone2 */
121	STATIC AV *
122	clone_padlist (AV *protopadlist)
123	{	164	{
124	AV *av;	165	AV *padlist = CvPADLIST (cv);
125	I32 ix;
126	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
127	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
128	SV **pname = AvARRAY (protopad_name);
129	SV **ppad = AvARRAY (protopad);
130	I32 fname = AvFILLp (protopad_name);
131	I32 fpad = AvFILLp (protopad);
132	AV *newpadlist, *newpad_name, *newpad;	166	AV *newpadlist, *newpad;
133	SV **npad;
134
135	newpad_name = newAV ();
136	for (ix = fname; ix >= 0; ix--)
137	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
138
139	newpad = newAV ();
140	av_fill (newpad, AvFILLp (protopad));
141	npad = AvARRAY (newpad);
142		167
143	newpadlist = newAV ();	168	newpadlist = newAV ();
144	AvREAL_off (newpadlist);	169	AvREAL_off (newpadlist);
145	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)));
146	av_store (newpadlist, 1, (SV *) newpad);	179	av_store (newpadlist, 1, (SV *)newpad);
147		180
148	av = newAV (); /* will be @_ */	181	return newpadlist;
149	av_extend (av, 0);	182	}
150	av_store (newpad, 0, (SV *) av);
151	AvFLAGS (av) = AVf_REIFY;
152		183
153	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))
154	{	189	{
155	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	190	I32 i = AvFILLp (padlist);
156	if (namesv && namesv != &PL_sv_undef)	191	while (i >= 0)
157	{	192	{
158	char *name = SvPVX (namesv); /* XXX */	193	SV **svp = av_fetch (padlist, i--, FALSE);
159	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	194	if (svp)
160	{ /* lexical from outside? */
161	npad[ix] = SvREFCNT_inc (ppad[ix]);
162	}	195	{
163	else
164	{ /* our own lexical */
165	SV *sv;	196	SV *sv;
166	if (*name == '&')	197	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
167	sv = SvREFCNT_inc (ppad[ix]);	198	SvREFCNT_dec (sv);
168	else if (*name == '@')	199
169	sv = (SV *) newAV ();	200	SvREFCNT_dec (*svp);
170	else if (*name == '%')
171	sv = (SV *) newHV ();
172	else
173	sv = NEWSV (0, 0);
174	if (!SvPADBUSY (sv))
175	SvPADMY_on (sv);
176	npad[ix] = sv;
177	}	201	}
178	}	202	}
179	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	203
180	{	204	SvREFCNT_dec ((SV*)padlist);
181	npad[ix] = SvREFCNT_inc (ppad[ix]);
182	}
183	else
184	{
185	SV *sv = NEWSV (0, 0);
186	SvPADTMP_on (sv);
187	npad[ix] = sv;
188	}
189	}	205	}
		206	}
190		207
191	#if 0 /* return -ENOTUNDERSTOOD */	208	static int
192	/* 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;
193		213
194	for (ix = fpad; ix > 0; ix--) {	214	/* casting is fun. */
195	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
196	if (namesv	216	free_padlist (padlist);
197	&& namesv != &PL_sv_undef	217
198	&& !(SvFLAGS(namesv) & SVf_FAKE)	218	SvREFCNT_dec (av);
199	&& *SvPVX(namesv) == '&'	219
200	&& CvCLONE(ppad[ix]))	220	return 0;
201	{	221	}
202	CV *kid = cv_clone((CV*)ppad[ix]);	222
203	SvREFCNT_dec(ppad[ix]);	223	#define PERL_MAGIC_coro PERL_MAGIC_ext
204	CvCLONE_on(kid);	224
205	SvPADMY_on(kid);	225	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
206	npad[ix] = (SV*)kid;	226
207	}	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 ();
208	}	269	}
209	#endif
210		270
211	return newpadlist;	271	av = (AV *)mg->mg_obj;
212	}
213		272
214	#ifdef MAY_FLUSH	273	if (AvFILLp (av) >= AvMAX (av))
215	STATIC AV *	274	av_extend (av, AvMAX (av) + 1);
216	free_padlist (AV *padlist)
217	{
218	/* may be during global destruction */
219	if (SvREFCNT(padlist))
220	{
221	I32 i = AvFILLp(padlist);
222	while (i >= 0)
223	{
224	SV **svp = av_fetch(padlist, i--, FALSE);
225	SV *sv = svp ? *svp : Nullsv;
226	if (sv)
227	SvREFCNT_dec(sv);
228	}
229		275
230	SvREFCNT_dec((SV*)padlist);	276	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
231	}
232	}	277	}
233	#endif
234
235	/* the next two functions merely cache the padlists */
236	STATIC void
237	get_padlist (CV *cv)
238	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
240
241	if (he && AvFILLp ((AV *)*he) >= 0)
242	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
243	else
244	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
245	}
246
247	STATIC void
248	put_padlist (CV *cv)
249	{
250	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
251
252	if (SvTYPE (*he) != SVt_PVAV)
253	{
254	SvREFCNT_dec (*he);
255	*he = (SV *)newAV ();
256	}
257
258	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
259	}
260
261	#ifdef MAY_FLUSH
262	STATIC void
263	flush_padlist_cache ()
264	{
265	HV *hv = padlist_cache;
266	padlist_cache = newHV ();
267
268	if (hv_iterinit (hv))
269	{
270	HE *he;
271	AV *padlist;
272
273	while (!!(he = hv_iternext (hv)))
274	{
275	AV *av = (AV *)HeVAL(he);
276
277	/* casting is fun. */
278	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
279	free_padlist (padlist);
280	}
281	}
282
283	SvREFCNT_dec (hv);
284	}
285	#endif
286		278
287	#define SB do {	279	#define SB do {
288	#define SE } while (0)	280	#define SE } while (0)
289		281
290	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	282	#define LOAD(state) load_state((state));
291	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	283	#define SAVE(state,flags) save_state((state),(flags));
292		284
293	#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
294		286
295	static void	287	static void
296	load_state(pTHX_ Coro__State c)	288	load_state(Coro__State c)
297	{	289	{
298	PL_dowarn = c->dowarn;	290	#define VAR(name,type) PL_ ## name = c->name;
299	PL_in_eval = c->in_eval;	291	# include "state.h"
300		292	#undef VAR
301	PL_curstackinfo = c->curstackinfo;
302	PL_curstack = c->curstack;
303	PL_mainstack = c->mainstack;
304	PL_stack_sp = c->stack_sp;
305	PL_op = c->op;
306	PL_curpad = c->curpad;
307	PL_stack_base = c->stack_base;
308	PL_stack_max = c->stack_max;
309	PL_tmps_stack = c->tmps_stack;
310	PL_tmps_floor = c->tmps_floor;
311	PL_tmps_ix = c->tmps_ix;
312	PL_tmps_max = c->tmps_max;
313	PL_markstack = c->markstack;
314	PL_markstack_ptr = c->markstack_ptr;
315	PL_markstack_max = c->markstack_max;
316	PL_scopestack = c->scopestack;
317	PL_scopestack_ix = c->scopestack_ix;
318	PL_scopestack_max = c->scopestack_max;
319	PL_savestack = c->savestack;
320	PL_savestack_ix = c->savestack_ix;
321	PL_savestack_max = c->savestack_max;
322	PL_retstack = c->retstack;
323	PL_retstack_ix = c->retstack_ix;
324	PL_retstack_max = c->retstack_max;
325	PL_curcop = c->curcop;
326	PL_top_env = c->top_env;
327		293
328	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	294	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
329	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	295	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
330	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	296	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
331		297
…		…
334	CV *cv;	300	CV *cv;
335		301
336	/* now do the ugly restore mess */	302	/* now do the ugly restore mess */
337	while ((cv = (CV *)POPs))	303	while ((cv = (CV *)POPs))
338	{	304	{
339	AV *padlist = (AV *)POPs;
340
341	if (padlist)
342	{
343	put_padlist (cv); /* mark this padlist as available */	305	put_padlist (cv); /* mark this padlist as available */
344	CvPADLIST(cv) = padlist;	306	CvDEPTH (cv) = PTR2IV (POPs);
345	#ifdef USE_THREADS	307	CvPADLIST (cv) = (AV *)POPs;
346	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
347	#endif
348	}
349
350	++CvDEPTH(cv);
351	}	308	}
352		309
353	PUTBACK;	310	PUTBACK;
354	}	311	}
355	}	312	}
356		313
357	static void	314	static void
358	save_state(pTHX_ Coro__State c, int flags)	315	save_state(Coro__State c, int flags)
359	{	316	{
360	{	317	{
361	dSP;	318	dSP;
362	I32 cxix = cxstack_ix;	319	I32 cxix = cxstack_ix;
363	PERL_CONTEXT *ccstk = cxstack;	320	PERL_CONTEXT *ccstk = cxstack;
…		…
370		327
371	PUSHs (Nullsv);	328	PUSHs (Nullsv);
372	/* this loop was inspired by pp_caller */	329	/* this loop was inspired by pp_caller */
373	for (;;)	330	for (;;)
374	{	331	{
375	do	332	while (cxix >= 0)
376	{	333	{
377	PERL_CONTEXT *cx = &ccstk[cxix--];	334	PERL_CONTEXT *cx = &ccstk[cxix--];
378		335
379	if (CxTYPE(cx) == CXt_SUB)	336	if (CxTYPE(cx) == CXt_SUB)
380	{	337	{
381	CV *cv = cx->blk_sub.cv;	338	CV *cv = cx->blk_sub.cv;
		339
382	if (CvDEPTH(cv))	340	if (CvDEPTH (cv))
383	{	341	{
384	#ifdef USE_THREADS
385	/*XPUSHs ((SV *)CvOWNER(cv));*/
386	/*CvOWNER(cv) = 0;*/
387	/*error must unlock this cv etc.. etc...*/
388	#endif
389	EXTEND (SP, CvDEPTH(cv)*2);	342	EXTEND (SP, 3);
390
391	while (--CvDEPTH(cv))
392	{
393	/* this tells the restore code to increment CvDEPTH */
394	PUSHs (Nullsv);
395	PUSHs ((SV *)cv);
396	}
397		343
398	PUSHs ((SV *)CvPADLIST(cv));	344	PUSHs ((SV *)CvPADLIST(cv));
		345	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
399	PUSHs ((SV *)cv);	346	PUSHs ((SV *)cv);
400		347
		348	CvDEPTH (cv) = 0;
401	get_padlist (cv); /* this is a monster */	349	get_padlist (cv);
402	}	350	}
403	}	351	}
		352	#ifdef CXt_FORMAT
404	else if (CxTYPE(cx) == CXt_FORMAT)	353	else if (CxTYPE(cx) == CXt_FORMAT)
405	{	354	{
406	/* 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? */
407	/* my bold guess is as a simple, plain sub... */	356	/* my bold guess is as a simple, plain sub... */
408	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");
409	}	358	}
		359	#endif
410	}	360	}
411	while (cxix >= 0);
412		361
413	if (top_si->si_type == PERLSI_MAIN)	362	if (top_si->si_type == PERLSI_MAIN)
414	break;	363	break;
415		364
416	top_si = top_si->si_prev;	365	top_si = top_si->si_prev;
…		…
423		372
424	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;
425	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	374	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
426	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	375	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
427		376
428	/* I have not the slightest idea of why av_reify is necessary */	377	#define VAR(name,type)c->name = PL_ ## name;
429	/* but if it's missing the defav contents magically get replaced sometimes */	378	# include "state.h"
430	if (c->defav)	379	#undef VAR
431	av_reify (c->defav);
432
433	c->dowarn = PL_dowarn;
434	c->in_eval = PL_in_eval;
435
436	c->curstackinfo = PL_curstackinfo;
437	c->curstack = PL_curstack;
438	c->mainstack = PL_mainstack;
439	c->stack_sp = PL_stack_sp;
440	c->op = PL_op;
441	c->curpad = PL_curpad;
442	c->stack_base = PL_stack_base;
443	c->stack_max = PL_stack_max;
444	c->tmps_stack = PL_tmps_stack;
445	c->tmps_floor = PL_tmps_floor;
446	c->tmps_ix = PL_tmps_ix;
447	c->tmps_max = PL_tmps_max;
448	c->markstack = PL_markstack;
449	c->markstack_ptr = PL_markstack_ptr;
450	c->markstack_max = PL_markstack_max;
451	c->scopestack = PL_scopestack;
452	c->scopestack_ix = PL_scopestack_ix;
453	c->scopestack_max = PL_scopestack_max;
454	c->savestack = PL_savestack;
455	c->savestack_ix = PL_savestack_ix;
456	c->savestack_max = PL_savestack_max;
457	c->retstack = PL_retstack;
458	c->retstack_ix = PL_retstack_ix;
459	c->retstack_max = PL_retstack_max;
460	c->curcop = PL_curcop;
461	c->top_env = PL_top_env;
462	}	380	}
463		381
464	/*	382	/*
465	* allocate various perl stacks. This is an exact copy	383	* allocate various perl stacks. This is an exact copy
466	* of perl.c:init_stacks, except that it uses less memory	384	* of perl.c:init_stacks, except that it uses less memory
467	* on the assumption that coroutines do not usually need	385	* on the (sometimes correct) assumption that coroutines do
468	* a lot of stackspace.	386	* not usually need a lot of stackspace.
469	*/	387	*/
470	STATIC void	388	static void
471	coro_init_stacks (pTHX)	389	coro_init_stacks ()
472	{	390	{
473	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	391	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
474	PL_curstackinfo->si_type = PERLSI_MAIN;	392	PL_curstackinfo->si_type = PERLSI_MAIN;
475	PL_curstack = PL_curstackinfo->si_stack;	393	PL_curstack = PL_curstackinfo->si_stack;
476	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	394	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
…		…
486		404
487	New(54,PL_markstack,16,I32);	405	New(54,PL_markstack,16,I32);
488	PL_markstack_ptr = PL_markstack;	406	PL_markstack_ptr = PL_markstack;
489	PL_markstack_max = PL_markstack + 16;	407	PL_markstack_max = PL_markstack + 16;
490		408
		409	#ifdef SET_MARK_OFFSET
491	SET_MARK_OFFSET;	410	SET_MARK_OFFSET;
		411	#endif
492		412
493	New(54,PL_scopestack,16,I32);	413	New(54,PL_scopestack,16,I32);
494	PL_scopestack_ix = 0;	414	PL_scopestack_ix = 0;
495	PL_scopestack_max = 16;	415	PL_scopestack_max = 16;
496		416
497	New(54,PL_savestack,96,ANY);	417	New(54,PL_savestack,96,ANY);
498	PL_savestack_ix = 0;	418	PL_savestack_ix = 0;
499	PL_savestack_max = 96;	419	PL_savestack_max = 96;
500		420
		421	#if !PERL_VERSION_ATLEAST (5,9,0)
501	New(54,PL_retstack,8,OP*);	422	New(54,PL_retstack,8,OP*);
502	PL_retstack_ix = 0;	423	PL_retstack_ix = 0;
503	PL_retstack_max = 8;	424	PL_retstack_max = 8;
		425	#endif
504	}	426	}
505		427
506	/*	428	/*
507	* destroy the stacks, the callchain etc...	429	* destroy the stacks, the callchain etc...
508	* still there is a memleak of 128 bytes...
509	*/	430	*/
510	STATIC void	431	static void
511	destroy_stacks(pTHX)	432	coro_destroy_stacks ()
512	{	433	{
		434	if (!IN_DESTRUCT)
		435	{
513	/* is this ugly, I ask? */	436	/* is this ugly, I ask? */
514	while (PL_scopestack_ix)	437	LEAVE_SCOPE (0);
515	LEAVE;
516		438
517	/* sure it is, but more important: is it correct?? :/ */	439	/* sure it is, but more important: is it correct?? :/ */
518	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
519	FREETMPS;	440	FREETMPS;
		441
		442	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		443	}
520		444
521	while (PL_curstackinfo->si_next)	445	while (PL_curstackinfo->si_next)
522	PL_curstackinfo = PL_curstackinfo->si_next;	446	PL_curstackinfo = PL_curstackinfo->si_next;
523		447
524	while (PL_curstackinfo)	448	while (PL_curstackinfo)
525	{	449	{
526	PERL_SI *p = PL_curstackinfo->si_prev;	450	PERL_SI *p = PL_curstackinfo->si_prev;
527		451
528	{	452	{ /*D*//*remove*/
529	dSP;	453	dSP;
530	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	454	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
531	PUTBACK; /* possibly superfluous */	455	PUTBACK; /* possibly superfluous */
532	}	456	}
533		457
534	dounwind(-1);	458	if (!IN_DESTRUCT)
535		459	{
		460	dounwind (-1);/*D*//*remove*/
536	SvREFCNT_dec(PL_curstackinfo->si_stack);	461	SvREFCNT_dec (PL_curstackinfo->si_stack);
		462	}
		463
537	Safefree(PL_curstackinfo->si_cxstack);	464	Safefree (PL_curstackinfo->si_cxstack);
538	Safefree(PL_curstackinfo);	465	Safefree (PL_curstackinfo);
539	PL_curstackinfo = p;	466	PL_curstackinfo = p;
540	}	467	}
541		468
542	Safefree(PL_tmps_stack);	469	Safefree (PL_tmps_stack);
543	Safefree(PL_markstack);	470	Safefree (PL_markstack);
544	Safefree(PL_scopestack);	471	Safefree (PL_scopestack);
545	Safefree(PL_savestack);	472	Safefree (PL_savestack);
		473	#if !PERL_VERSION_ATLEAST (5,9,0)
546	Safefree(PL_retstack);	474	Safefree (PL_retstack);
547	}
548
549	static void
550	allocate_stack (Coro__State ctx, int alloc)
551	{
552	coro_stack *stack;
553
554	New (0, stack, 1, coro_stack);
555
556	stack->refcnt = 1;
557	stack->usecnt = 1;
558	stack->gencnt = ctx->gencnt = 0;
559	if (alloc)
560	{
561	#ifdef HAVE_MMAP
562	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
563	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
564	if (stack->sptr == (void *)-1)
565	#endif	475	#endif
566	{
567	/*FIXME*//*D*//* reasonable stack size! */
568	stack->ssize = -4096 * sizeof (long);
569	New (0, stack->sptr, 4096, long);
570	}
571	}
572	else
573	stack->sptr = 0;
574
575	ctx->stack = stack;
576	}	476	}
577		477
578	static void	478	static void
579	deallocate_stack (Coro__State ctx)	479	setup_coro (struct coro *coro)
580	{
581	coro_stack *stack = ctx->stack;
582
583	ctx->stack = 0;
584
585	if (stack)
586	{
587	if (!--stack->refcnt)
588	{
589	#ifdef HAVE_MMAP
590	if (stack->ssize > 0 && stack->sptr)
591	munmap (stack->sptr, stack->ssize);
592	else
593	#else
594	Safefree (stack->sptr);
595	#endif
596	Safefree (stack);
597	}
598	else if (ctx->gencnt == stack->gencnt)
599	--stack->usecnt;
600	}
601	}
602
603	static void
604	setup_coro (void *arg)
605	{	480	{
606	/*	481	/*
607	* emulate part of the perl startup here.	482	* emulate part of the perl startup here.
608	*/	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	{
609	dSP;	530	dSP;
610	Coro__State ctx = (Coro__State)arg;	531	LOGOP myop;
611	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
612		532
613	coro_init_stacks (aTHX);	533	Zero (&myop, 1, LOGOP);
614	/*PL_curcop = 0;*/	534	myop.op_next = PL_op;
615	/*PL_in_eval = PL_in_eval;*/ /* inherit */	535	myop.op_flags = OPf_WANT_VOID;
616	SvREFCNT_dec (GvAV (PL_defgv));
617	GvAV (PL_defgv) = ctx->args;
618		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);
619	SPAGAIN;	543	SPAGAIN;
620
621	if (ctx->stack)
622	{
623	ctx->cursp = 0;
624
625	PUSHMARK(SP);
626	PUTBACK;
627	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
628
629	if (SvTRUE (ERRSV))
630	croak (NULL);
631	else
632	croak ("FATAL: CCTXT coroutine returned!");
633	}
634	else
635	{
636	UNOP myop;
637
638	PL_op = (OP *)&myop;
639
640	Zero(&myop, 1, UNOP);
641	myop.op_next = Nullop;
642	myop.op_flags = OPf_WANT_VOID;
643
644	PUSHMARK(SP);
645	XPUSHs (sub_init);
646	/*
647	* the next line is slightly wrong, as PL_op->op_next
648	* is actually being executed so we skip the first op.
649	* that doesn't matter, though, since it is only
650	* pp_nextstate and we never return...
651	* ah yes, and I don't care anyways ;)
652	*/
653	PUTBACK;
654	PL_op = pp_entersub();
655	SPAGAIN;
656
657	ENTER; /* necessary e.g. for dounwind */
658	}
659	}	544	}
660		545
661	static void	546	static void
662	continue_coro (void *arg)	547	coro_run (void *arg)
663	{	548	{
		549	/* coro_run is the alternative epilogue of transfer() */
		550	UNLOCK;
		551
664	/*	552	/*
665	* this is a _very_ stripped down perl interpreter ;)	553	* this is a _very_ stripped down perl interpreter ;)
666	*/	554	*/
667	Coro__State ctx = (Coro__State)arg;	555	PL_top_env = &PL_start_env;
668		556
669	/*FIXME*//* must set up top_env here */	557	/* inject call to cctx_init */
670	ctx->cursp = 0;	558	prepare_cctx ((coro_cctx *)arg);
671	PL_op = PL_op->op_next;
672	CALLRUNOPS(aTHX);
673		559
		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);
674	abort ();	564	abort ();
675	}	565	}
676		566
677	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
678	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	668	transfer (struct coro *prev, struct coro *next, int flags)
679	{	669	{
680	dSP;
681	dSTACKLEVEL;	670	dSTACKLEVEL;
682		671
		672	/* sometimes transfer is only called to set idle_sp */
		673	if (flags == TRANSFER_SET_STACKLEVEL)
		674	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
683	if (prev != next)	675	else if (prev != next)
684	{	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
685	if (next->mainstack)	698	if (next->mainstack)
686	{	699	{
		700	/* coroutine already started */
687	SAVE (prev, flags);	701	SAVE (prev, flags);
688	LOAD (next);	702	LOAD (next);
689
690	/* mark this state as in-use */
691	next->mainstack = 0;
692	next->tmps_ix = -2;
693
694	/* stacklevel changed? if yes, grab the stack for us! */
695	if (flags & TRANSFER_SAVE_CCTXT)
696	{
697	if (!prev->stack)
698	allocate_stack (prev, 0);
699	else if (prev->cursp != stacklevel
700	&& prev->stack->usecnt > 1)
701	{
702	prev->gencnt = ++prev->stack->gencnt;
703	prev->stack->usecnt = 1;
704	}
705
706	/* has our stack been invalidated? */
707	if (next->stack && next->stack->gencnt != next->gencnt)
708	{
709	deallocate_stack (next);
710	allocate_stack (next, 1);
711	coro_create (&(next->stack->cctx),
712	continue_coro, (void *)next,
713	next->stack->sptr, labs (next->stack->ssize));
714	}
715
716	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
717	}
718
719	}	703	}
720	else if (next->tmps_ix == -2)
721	croak ("tried to transfer to running coroutine");
722	else	704	else
723	{	705	{
		706	/* need to start coroutine */
724	SAVE (prev, -1); /* first get rid of the old state */	707	/* first get rid of the old state */
725		708	SAVE (prev, -1);
726	if (flags & TRANSFER_SAVE_CCTXT)	709	/* setup coroutine call */
727	{
728	if (!prev->stack)
729	allocate_stack (prev, 0);
730
731	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
732	{
733	setup_coro (next);
734
735	prev->stack->refcnt++;
736	prev->stack->usecnt++;
737	next->stack = prev->stack;
738	next->gencnt = prev->gencnt;
739	}
740	else
741	{
742	allocate_stack (next, 1);
743	coro_create (&(next->stack->cctx),
744	setup_coro, (void *)next,
745	next->stack->sptr, labs (next->stack->ssize));
746	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
747	}
748	}
749	else
750	setup_coro (next);	710	setup_coro (next);
		711	/* need a new stack */
		712	assert (!next->stack);
751	}	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
		726	if (!next->cctx)
		727	next->cctx = cctx_get ();
		728
		729	if (prev__cctx != next->cctx)
		730	{
		731	assert ( prev__cctx->inuse);
		732	assert (!next->cctx->inuse);
		733
		734	prev__cctx->inuse = 0;
		735	next->cctx->inuse = 1;
		736
		737	prev__cctx->top_env = PL_top_env;
		738	PL_top_env = next->cctx->top_env;
		739	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		740	}
		741
		742	free_coro_mortal ();
		743
		744	UNLOCK;
752	}	745	}
753
754	next->cursp = stacklevel;
755	}	746	}
		747
		748	struct transfer_args
		749	{
		750	struct coro *prev, *next;
		751	int flags;
		752	};
		753
		754	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		755
		756	static void
		757	coro_state_destroy (struct coro *coro)
		758	{
		759	if (coro->refcnt--)
		760	return;
		761
		762	if (coro->flags & CF_RUNNING)
		763	croak ("FATAL: tried to destroy currently running coroutine");
		764
		765	if (coro->mainstack && coro->mainstack != main_mainstack)
		766	{
		767	struct coro temp;
		768
		769	SAVE ((&temp), TRANSFER_SAVE_ALL);
		770	LOAD (coro);
		771
		772	coro_destroy_stacks ();
		773
		774	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		775
		776	coro->mainstack = 0;
		777	}
		778
		779	cctx_free (coro->cctx);
		780	SvREFCNT_dec (coro->args);
		781	Safefree (coro);
		782	}
		783
		784	static int
		785	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		786	{
		787	struct coro *coro = (struct coro *)mg->mg_ptr;
		788	mg->mg_ptr = 0;
		789
		790	coro_state_destroy (coro);
		791
		792	return 0;
		793	}
		794
		795	static int
		796	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		797	{
		798	struct coro *coro = (struct coro *)mg->mg_ptr;
		799
		800	++coro->refcnt;
		801
		802	return 0;
		803	}
		804
		805	static MGVTBL coro_state_vtbl = {
		806	0, 0, 0, 0,
		807	coro_state_clear,
		808	0,
		809	#ifdef MGf_DUP
		810	coro_state_dup,
		811	#else
		812	# define MGf_DUP 0
		813	#endif
		814	};
756		815
757	static struct coro *	816	static struct coro *
758	sv_to_coro (SV *arg, const char *funcname, const char *varname)	817	SvSTATE (SV *coro)
759	{	818	{
760	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	819	HV *stash;
		820	MAGIC *mg;
		821
		822	if (SvROK (coro))
		823	coro = SvRV (coro);
		824
		825	stash = SvSTASH (coro);
		826	if (stash != coro_stash && stash != coro_state_stash)
		827	{
		828	/* very slow, but rare, check */
		829	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		830	croak ("Coro::State object required");
		831	}
		832
		833	mg = SvMAGIC (coro);
		834	assert (mg->mg_type == PERL_MAGIC_ext);
		835	return (struct coro *)mg->mg_ptr;
		836	}
		837
		838	static void
		839	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		840	{
		841	ta->prev = SvSTATE (prev);
		842	ta->next = SvSTATE (next);
		843	ta->flags = flags;
		844	}
		845
		846	static void
		847	api_transfer (SV *prev, SV *next, int flags)
		848	{
		849	dTHX;
		850	struct transfer_args ta;
		851
		852	prepare_transfer (&ta, prev, next, flags);
		853	TRANSFER (ta);
		854	}
		855
		856	/** Coro ********************************************************************/
		857
		858	#define PRIO_MAX 3
		859	#define PRIO_HIGH 1
		860	#define PRIO_NORMAL 0
		861	#define PRIO_LOW -1
		862	#define PRIO_IDLE -3
		863	#define PRIO_MIN -4
		864
		865	/* for Coro.pm */
		866	static GV *coro_current, *coro_idle;
		867	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		868	static int coro_nready;
		869
		870	static void
		871	coro_enq (SV *coro_sv)
		872	{
		873	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		874	coro_nready++;
		875	}
		876
		877	static SV *
		878	coro_deq (int min_prio)
		879	{
		880	int prio = PRIO_MAX - PRIO_MIN;
		881
		882	min_prio -= PRIO_MIN;
		883	if (min_prio < 0)
		884	min_prio = 0;
		885
		886	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		887	if (AvFILLp (coro_ready [prio]) >= 0)
761	{	888	{
762	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	889	coro_nready--;
763		890	return av_shift (coro_ready [prio]);
764	if (!he)
765	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
766
767	arg = HeVAL(he);
768	}	891	}
		892
		893	return 0;
		894	}
		895
		896	static int
		897	api_ready (SV *coro_sv)
		898	{
		899	struct coro *coro;
		900
		901	if (SvROK (coro_sv))
		902	coro_sv = SvRV (coro_sv);
		903
		904	coro = SvSTATE (coro_sv);
		905
		906	if (coro->flags & CF_READY)
		907	return 0;
		908
		909	if (coro->flags & CF_RUNNING)
		910	croak ("Coro::ready called on currently running coroutine");
		911
		912	coro->flags |= CF_READY;
		913
		914	LOCK;
		915	coro_enq (SvREFCNT_inc (coro_sv));
		916	UNLOCK;
		917
		918	return 1;
		919	}
		920
		921	static int
		922	api_is_ready (SV *coro_sv)
		923	{
		924	return !!SvSTATE (coro_sv)->flags & CF_READY;
		925	}
		926
		927	static void
		928	prepare_schedule (struct transfer_args *ta)
		929	{
		930	SV *current, *prev, *next;
		931
		932	current = GvSV (coro_current);
		933
		934	for (;;)
		935	{
		936	LOCK;
		937	next = coro_deq (PRIO_MIN);
		938	UNLOCK;
		939
		940	if (next)
		941	break;
		942
769		943	{
770	/* must also be changed inside Coro::Cont::yield */	944	dSP;
771	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)	945
772	return (struct coro *) SvIV((SV*)SvRV(arg));	946	ENTER;
773	else	947	SAVETMPS;
774	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	948
		949	PUSHMARK (SP);
		950	PUTBACK;
		951	call_sv (GvSV (coro_idle), G_DISCARD);
		952
		953	FREETMPS;
		954	LEAVE;
		955	}
		956	}
		957
		958	prev = SvRV (current);
		959	SvRV (current) = next;
		960
		961	/* free this only after the transfer */
		962	LOCK;
		963	free_coro_mortal ();
		964	UNLOCK;
		965	coro_mortal = prev;
		966
		967	ta->prev = SvSTATE (prev);
		968	ta->next = SvSTATE (next);
		969	ta->flags = TRANSFER_SAVE_ALL;
		970
		971	ta->next->flags &= ~CF_READY;
		972	}
		973
		974	static void
		975	prepare_cede (struct transfer_args *ta)
		976	{
		977	api_ready (GvSV (coro_current));
		978
		979	prepare_schedule (ta);
		980	}
		981
		982	static void
		983	api_schedule (void)
		984	{
		985	dTHX;
		986	struct transfer_args ta;
		987
		988	prepare_schedule (&ta);
		989	TRANSFER (ta);
		990	}
		991
		992	static void
		993	api_cede (void)
		994	{
		995	dTHX;
		996	struct transfer_args ta;
		997
		998	prepare_cede (&ta);
		999	TRANSFER (ta);
775	}	1000	}
776		1001
777	MODULE = Coro::State PACKAGE = Coro::State	1002	MODULE = Coro::State PACKAGE = Coro::State
778		1003
779	PROTOTYPES: ENABLE	1004	PROTOTYPES: DISABLE
780		1005
781	BOOT:	1006	BOOT:
782	{ /* {} necessary for stoopid perl-5.6.x */	1007	{
783	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1008	#ifdef USE_ITHREADS
784	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1009	MUTEX_INIT (&coro_mutex);
		1010	#endif
		1011	BOOT_PAGESIZE;
		1012
785	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1013	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
786		1014
787	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1015	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
788	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1016	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
789	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1017	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
790	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
791
792	if (!padlist_cache)
793	padlist_cache = newHV ();
794		1018
795	main_mainstack = PL_mainstack;	1019	main_mainstack = PL_mainstack;
796	}
797		1020
798	Coro::State	1021	coroapi.ver = CORO_API_VERSION;
799	_newprocess(args)	1022	coroapi.transfer = api_transfer;
800	SV * args	1023
801	PROTOTYPE: $	1024	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1025	}
		1026
		1027	SV *
		1028	new (char *klass, ...)
802	CODE:	1029	CODE:
803	Coro__State coro;	1030	{
		1031	struct coro *coro;
		1032	HV *hv;
		1033	int i;
804		1034
805	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
806	croak ("Coro::State::_newprocess expects an arrayref");
807
808	New (0, coro, 1, struct coro);	1035	Newz (0, coro, 1, struct coro);
		1036	coro->args = newAV ();
809		1037
810	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1038	hv = newHV ();
811	coro->mainstack = 0; /* actual work is done inside transfer */	1039	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
812	coro->stack = 0;	1040	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
813		1041
814	RETVAL = coro;	1042	for (i = 1; i < items; i++)
		1043	av_push (coro->args, newSVsv (ST (i)));
		1044	}
815	OUTPUT:	1045	OUTPUT:
816	RETVAL	1046	RETVAL
817		1047
818	void	1048	void
819	transfer(prev, next, flags)	1049	_set_stacklevel (...)
820	Coro::State_or_hashref prev	1050	ALIAS:
821	Coro::State_or_hashref next	1051	Coro::State::transfer = 1
822	int flags	1052	Coro::schedule = 2
823	PROTOTYPE: @	1053	Coro::cede = 3
		1054	Coro::Cont::yield = 4
824	CODE:	1055	CODE:
825	PUTBACK;	1056	{
826	transfer (aTHX_ prev, next, flags);	1057	struct transfer_args ta;
827	SPAGAIN;	1058
		1059	switch (ix)
		1060	{
		1061	case 0:
		1062	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1063	ta.next = 0;
		1064	ta.flags = TRANSFER_SET_STACKLEVEL;
		1065	break;
		1066
		1067	case 1:
		1068	if (items != 3)
		1069	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1070
		1071	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1072	break;
		1073
		1074	case 2:
		1075	prepare_schedule (&ta);
		1076	break;
		1077
		1078	case 3:
		1079	prepare_cede (&ta);
		1080	break;
		1081
		1082	case 4:
		1083	{
		1084	SV *yieldstack;
		1085	SV *sv;
		1086	AV *defav = GvAV (PL_defgv);
		1087
		1088	yieldstack = *hv_fetch (
		1089	(HV *)SvRV (GvSV (coro_current)),
		1090	"yieldstack", sizeof ("yieldstack") - 1,
		1091	0
		1092	);
		1093
		1094	/* set up @_ -- ugly */
		1095	av_clear (defav);
		1096	av_fill (defav, items - 1);
		1097	while (items--)
		1098	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1099
		1100	sv = av_pop ((AV *)SvRV (yieldstack));
		1101	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1102	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1103	ta.flags = 0;
		1104	SvREFCNT_dec (sv);
		1105	}
		1106	break;
		1107
		1108	}
		1109
		1110	TRANSFER (ta);
		1111	}
828		1112
829	void	1113	void
830	DESTROY(coro)	1114	_clone_state_from (SV *dst, SV *src)
831	Coro::State coro	1115	CODE:
832	CODE:	1116	{
		1117	struct coro *coro_src = SvSTATE (src);
833		1118
834	if (coro->mainstack && coro->mainstack != main_mainstack)	1119	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
835	{
836	struct coro temp;
837		1120
838	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1121	++coro_src->refcnt;
839	LOAD(aTHX_ coro);	1122	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
840		1123	}
841	destroy_stacks (aTHX);
842
843	LOAD((&temp)); /* this will get rid of defsv etc.. */
844
845	coro->mainstack = 0;
846	}
847
848	deallocate_stack (coro);
849
850	Safefree (coro);
851		1124
852	void	1125	void
853	flush()
854	CODE:
855	#ifdef MAY_FLUSH
856	flush_padlist_cache ();
857	#endif
858
859	void
860	_exit(code)	1126	_exit (code)
861	int code	1127	int code
862	PROTOTYPE: $	1128	PROTOTYPE: $
863	CODE:	1129	CODE:
864	#if defined(__GLIBC__) || _POSIX_C_SOURCE
865	_exit (code);	1130	_exit (code);
866	#else
867	signal (SIGTERM, SIG_DFL);
868	raise (SIGTERM);
869	exit (code);
870	#endif
871		1131
		1132	int
		1133	cctx_count ()
		1134	CODE:
		1135	RETVAL = cctx_count;
		1136	OUTPUT:
		1137	RETVAL
		1138
		1139	int
		1140	cctx_idle ()
		1141	CODE:
		1142	RETVAL = cctx_idle;
		1143	OUTPUT:
		1144	RETVAL
		1145
872	MODULE = Coro::State PACKAGE = Coro::Cont	1146	MODULE = Coro::State PACKAGE = Coro
873		1147
874	# this is slightly dirty (should expose a c-level api)	1148	BOOT:
		1149	{
		1150	int i;
		1151
		1152	coro_stash = gv_stashpv ("Coro", TRUE);
		1153
		1154	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1155	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1156	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1157	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1158	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1159	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1160
		1161	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1162	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1163
		1164	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1165	coro_ready[i] = newAV ();
		1166
		1167	{
		1168	SV *sv = perl_get_sv("Coro::API", 1);
		1169
		1170	coroapi.schedule = api_schedule;
		1171	coroapi.cede = api_cede;
		1172	coroapi.ready = api_ready;
		1173	coroapi.is_ready = api_is_ready;
		1174	coroapi.nready = &coro_nready;
		1175	coroapi.current = coro_current;
		1176
		1177	GCoroAPI = &coroapi;
		1178	sv_setiv (sv, (IV)&coroapi);
		1179	SvREADONLY_on (sv);
		1180	}
		1181	}
		1182
		1183	int
		1184	prio (Coro::State coro, int newprio = 0)
		1185	ALIAS:
		1186	nice = 1
		1187	CODE:
		1188	{
		1189	RETVAL = coro->prio;
		1190
		1191	if (items > 1)
		1192	{
		1193	if (ix)
		1194	newprio += coro->prio;
		1195
		1196	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1197	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1198
		1199	coro->prio = newprio;
		1200	}
		1201	}
		1202
		1203	SV *
		1204	ready (SV *self)
		1205	PROTOTYPE: $
		1206	CODE:
		1207	RETVAL = boolSV (api_ready (self));
		1208	OUTPUT:
		1209	RETVAL
		1210
		1211	SV *
		1212	is_ready (SV *self)
		1213	PROTOTYPE: $
		1214	CODE:
		1215	RETVAL = boolSV (api_is_ready (self));
		1216	OUTPUT:
		1217	RETVAL
		1218
		1219	int
		1220	nready (...)
		1221	PROTOTYPE:
		1222	CODE:
		1223	RETVAL = coro_nready;
		1224	OUTPUT:
		1225	RETVAL
		1226
		1227	MODULE = Coro::State PACKAGE = Coro::AIO
		1228
		1229	SV *
		1230	_get_state ()
		1231	CODE:
		1232	{
		1233	struct {
		1234	int errorno;
		1235	int laststype;
		1236	int laststatval;
		1237	Stat_t statcache;
		1238	} data;
		1239
		1240	data.errorno = errno;
		1241	data.laststype = PL_laststype;
		1242	data.laststatval = PL_laststatval;
		1243	data.statcache = PL_statcache;
		1244
		1245	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1246	}
		1247	OUTPUT:
		1248	RETVAL
875		1249
876	void	1250	void
877	yield(...)	1251	_set_state (char *data_)
878	PROTOTYPE: @	1252	PROTOTYPE: $
879	CODE:
880	static SV *returnstk;
881	SV *sv;
882	AV *defav = GvAV (PL_defgv);
883	struct coro *prev, *next;
884
885	if (!returnstk)
886	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
887
888	/* set up @_ -- ugly */
889	av_clear (defav);
890	av_fill (defav, items - 1);
891	while (items--)
892	av_store (defav, items, SvREFCNT_inc (ST(items)));
893
894	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
895	sv = av_pop ((AV *)SvRV (returnstk));
896	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
897	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
898	SvREFCNT_dec (sv);
899
900	transfer(aTHX_ prev, next, 0);
901
902	MODULE = Coro::State PACKAGE = Coro
903
904	# this is slightly dirty (should expose a c-level api)
905
906	BOOT:
907	{
908	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
909	coro_ready = newAV ();
910	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
911	}
912
913	void
914	ready(self)
915	SV * self
916	CODE:	1253	CODE:
917	av_push (coro_ready, SvREFCNT_inc (self));	1254	{
		1255	struct {
		1256	int errorno;
		1257	int laststype;
		1258	int laststatval;
		1259	Stat_t statcache;
		1260	} *data = (void *)data_;
918		1261
919	void	1262	errno = data->errorno;
920	schedule(...)	1263	PL_laststype = data->laststype;
921	ALIAS:	1264	PL_laststatval = data->laststatval;
922	cede = 1	1265	PL_statcache = data->statcache;
923	CODE:	1266	}
924	SV *prev = GvSV (coro_current);
925	SV *next = av_shift (coro_ready);
926
927	if (next == &PL_sv_undef)
928	next = SvREFCNT_inc (GvSV (coro_idle));
929
930	if (ix)
931	av_push (coro_ready, SvREFCNT_inc (prev));
932
933	GvSV (coro_current) = SvREFCNT_inc (next);
934	transfer (sv_to_coro (prev, "Coro::schedule", "current coroutine"),
935	sv_to_coro (next, "Coro::schedule", "next coroutine"),
936	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
937	SvREFCNT_dec (next);
938	SvREFCNT_dec (prev);
939

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