[ViewVC] Diff of: cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.88 by root, Fri Nov 24 15:34:33 2006 UTC vs.
Revision 1.131 by root, Fri Dec 29 11:37:49 2006 UTC

…		…
1	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
4		2
5	#include "EXTERN.h"	3	#include "EXTERN.h"
6	#include "perl.h"	4	#include "perl.h"
7	#include "XSUB.h"	5	#include "XSUB.h"
8		6
9	#include "patchlevel.h"	7	#include "patchlevel.h"
10		8
11	#if PERL_VERSION < 6	9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
		12
		13	#ifdef HAVE_MMAP
		14	# include <unistd.h>
		15	# include <sys/mman.h>
		16	# ifndef MAP_ANONYMOUS
		17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
		19	# else
		20	# undef HAVE_MMAP
		21	# endif
		22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
		30	# endif
		31	#else
		32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	\|\| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	\|\| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	50	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	51	# define PL_ppaddr ppaddr
14	# endif	52	# endif
15	# ifndef call_sv	53	# ifndef call_sv
16	# define call_sv perl_call_sv	54	# define call_sv perl_call_sv
27	# ifndef IS_PADCONST	65	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	66	# define IS_PADCONST(v) 0
29	# endif	67	# endif
30	#endif	68	#endif
31		69
32	#include <errno.h>	70	/* 5.8.7 */
		71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
33		74
34	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
35	# undef STACKGUARD	76	# undef STACKGUARD
36	#endif	77	#endif
37		78
38	#ifndef STACKGUARD	79	#ifndef STACKGUARD
39	# define STACKGUARD 0	80	# define STACKGUARD 0
40	#endif	81	#endif
41		82
42	#ifdef HAVE_MMAP	83	/* prefer perl internal functions over our own? */
43	# include <unistd.h>	84	#ifndef PREFER_PERL_FUNCTIONS
44	# include <sys/mman.h>	85	# define PREFER_PERL_FUNCTIONS 0
45	# ifndef MAP_ANONYMOUS
46	# ifdef MAP_ANON
47	# define MAP_ANONYMOUS MAP_ANON
48	# else
49	# undef HAVE_MMAP
50	# endif
51	# endif	86	#endif
52	# include <limits.h>
53	# ifndef PAGESIZE
54	# define PAGESIZE pagesize
55	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
56	static long pagesize;
57	# else
58	# define BOOT_PAGESIZE
59	# endif
60	#endif
61
62	#define SUB_INIT "Coro::State::initialize"
63		87
64	/* The next macro should declare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
65	* to the current C stack pointer. Its property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
66	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
67	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
68		93
69	#define IN_DESTRUCT (PL_main_cv == Nullcv)	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
70		95
71	#define labs(l) ((l) >= 0 ? (l) : -(l))	96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		99	#else
		100	# define attribute(x)
		101	# define BARRIER
		102	#endif
		103
		104	#define NOINLINE attribute ((noinline))
72		105
73	#include "CoroAPI.h"	106	#include "CoroAPI.h"
74		107
75	#ifdef USE_ITHREADS	108	#ifdef USE_ITHREADS
76	static perl_mutex coro_mutex;	109	static perl_mutex coro_mutex;
…		…
79	#else	112	#else
80	# define LOCK (void)0	113	# define LOCK (void)0
81	# define UNLOCK (void)0	114	# define UNLOCK (void)0
82	#endif	115	#endif
83		116
		117	struct io_state
		118	{
		119	int errorno;
		120	I32 laststype;
		121	int laststatval;
		122	Stat_t statcache;
		123	};
		124
84	static struct CoroAPI coroapi;	125	static struct CoroAPI coroapi;
85	static AV main_mainstack; / used to differentiate between $main and others */	126	static AV main_mainstack; / used to differentiate between $main and others */
86	static HV coro_state_stash, coro_stash;	127	static HV coro_state_stash, coro_stash;
87	static SV coro_mortal; / will be freed after next transfer */	128	static SV coro_mortal; / will be freed after next transfer */
88		129
89	/* this is actually not only the c stack but also c registers etc... */	130	static struct coro_cctx *cctx_first;
		131	static int cctx_count, cctx_idle;
		132
		133	/* this is a structure representing a c-level coroutine */
90	typedef struct {	134	typedef struct coro_cctx {
91	int refcnt; /* pointer reference counter */	135	struct coro_cctx *next;
92	int usecnt; /* shared by how many coroutines */
93	int gencnt; /* generation counter */
94		136
95	coro_context cctx;	137	/* the stack */
96
97	void *sptr;	138	void *sptr;
98	long ssize; /* positive == mmap, otherwise malloc */	139	long ssize; /* positive == mmap, otherwise malloc */
99	} coro_stack;
100		140
		141	/* cpu state */
		142	void idle_sp; / sp of top-level transfer/schedule/cede call */
		143	JMPENV *top_env;
		144	coro_context cctx;
		145
		146	int inuse;
		147
		148	#if USE_VALGRIND
		149	int valgrind_id;
		150	#endif
		151	} coro_cctx;
		152
		153	enum {
		154	CF_RUNNING = 0x0001, /* coroutine is running */
		155	CF_READY = 0x0002, /* coroutine is ready */
		156	CF_NEW = 0x0004, /* ahs never been switched to */
		157	};
		158
		159	/* this is a structure representing a perl-level coroutine */
101	struct coro {	160	struct coro {
102	/* the optional C context */	161	/* the c coroutine allocated to this perl coroutine, if any */
103	coro_stack *stack;	162	coro_cctx *cctx;
104	void *cursp;
105	int gencnt;
106
107	/* optionally saved, might be zero */
108	AV *defav;
109	SV *defsv;
110	SV *errsv;
111
112	/* saved global state not related to stacks */
113	U8 dowarn;
114	I32 in_eval;
115
116	/* the stacks and related info (callchain etc..) */
117	PERL_SI *curstackinfo;
118	AV *curstack;
119	AV *mainstack;
120	SV **stack_sp;
121	OP *op;
122	SV **curpad;
123	AV *comppad;
124	CV *compcv;
125	SV **stack_base;
126	SV **stack_max;
127	SV **tmps_stack;
128	I32 tmps_floor;
129	I32 tmps_ix;
130	I32 tmps_max;
131	I32 *markstack;
132	I32 *markstack_ptr;
133	I32 *markstack_max;
134	I32 *scopestack;
135	I32 scopestack_ix;
136	I32 scopestack_max;
137	ANY *savestack;
138	I32 savestack_ix;
139	I32 savestack_max;
140	OP **retstack;
141	I32 retstack_ix;
142	I32 retstack_max;
143	PMOP *curpm;
144	COP *curcop;
145	JMPENV *top_env;
146
147	/* coro process data */
148	int prio;
149		163
150	/* data associated with this coroutine (initial args) */	164	/* data associated with this coroutine (initial args) */
151	AV *args;	165	AV *args;
152	int refcnt;	166	int refcnt;
		167	int save; /* CORO_SAVE flags */
		168	int flags; /* CF_ flags */
		169
		170	/* optionally saved, might be zero */
		171	AV defav; / @_ */
		172	SV defsv; / $_ */
		173	SV errsv; / $@ */
		174	SV irssv; / $/ */
		175	SV irssv_sv; / real $/ cache */
		176
		177	#define VAR(name,type) type name;
		178	# include "state.h"
		179	#undef VAR
		180
		181	/* coro process data */
		182	int prio;
153	};	183	};
154		184
155	typedef struct coro *Coro__State;	185	typedef struct coro *Coro__State;
156	typedef struct coro *Coro__State_or_hashref;	186	typedef struct coro *Coro__State_or_hashref;
157		187
158	static AV *	188	static AV *
159	coro_clone_padlist (pTHX_ CV *cv)	189	coro_clone_padlist (CV *cv)
160	{	190	{
161	AV *padlist = CvPADLIST (cv);	191	AV *padlist = CvPADLIST (cv);
162	AV newpadlist, newpad;	192	AV newpadlist, newpad;
163		193
164	newpadlist = newAV ();	194	newpadlist = newAV ();
165	AvREAL_off (newpadlist);	195	AvREAL_off (newpadlist);
166	#if PERL_VERSION < 9	196	#if PERL_VERSION_ATLEAST (5,9,0)
		197	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		198	#else
167	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	199	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
168	#else
169	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
170	#endif	200	#endif
171	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	201	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
172	--AvFILLp (padlist);	202	--AvFILLp (padlist);
173		203
174	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	204	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
176		206
177	return newpadlist;	207	return newpadlist;
178	}	208	}
179		209
180	static void	210	static void
181	free_padlist (pTHX_ AV *padlist)	211	free_padlist (AV *padlist)
182	{	212	{
183	/* may be during global destruction */	213	/* may be during global destruction */
184	if (SvREFCNT (padlist))	214	if (SvREFCNT (padlist))
185	{	215	{
186	I32 i = AvFILLp (padlist);	216	I32 i = AvFILLp (padlist);
…		…
207	AV *padlist;	237	AV *padlist;
208	AV av = (AV )mg->mg_obj;	238	AV av = (AV )mg->mg_obj;
209		239
210	/* casting is fun. */	240	/* casting is fun. */
211	while (&PL_sv_undef != (SV )(padlist = (AV )av_pop (av)))	241	while (&PL_sv_undef != (SV )(padlist = (AV )av_pop (av)))
212	free_padlist (aTHX_ padlist);	242	free_padlist (padlist);
213		243
214	SvREFCNT_dec (av);	244	SvREFCNT_dec (av);
215		245
216	return 0;	246	return 0;
217	}	247	}
218		248
219	#define PERL_MAGIC_coro PERL_MAGIC_ext	249	#define PERL_MAGIC_coro PERL_MAGIC_ext
220		250
221	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	251	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
222		252
		253	#define CORO_MAGIC(cv) \
		254	SvMAGIC (cv) \
		255	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		256	? SvMAGIC (cv) \
		257	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		258	: 0
		259
223	/* the next two functions merely cache the padlists */	260	/* the next two functions merely cache the padlists */
224	static void	261	static void
225	get_padlist (pTHX_ CV *cv)	262	get_padlist (CV *cv)
226	{	263	{
227	MAGIC mg = mg_find ((SV )cv, PERL_MAGIC_coro);	264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
228		266
229	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	267	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
230	CvPADLIST (cv) = (AV )av_pop ((AV )mg->mg_obj);	268	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
231	else	269	else
232	{	270	{
233	#if 0	271	#if PREFER_PERL_FUNCTIONS
234	/* this should work - but it doesn't :( */	272	/* this is probably cleaner, but also slower? */
235	CV *cp = Perl_cv_clone (aTHX_ cv);	273	CV *cp = Perl_cv_clone (cv);
236	CvPADLIST (cv) = CvPADLIST (cp);	274	CvPADLIST (cv) = CvPADLIST (cp);
237	CvPADLIST (cp) = 0;	275	CvPADLIST (cp) = 0;
238	SvREFCNT_dec (cp);	276	SvREFCNT_dec (cp);
239	#else	277	#else
240	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	278	CvPADLIST (cv) = coro_clone_padlist (cv);
241	#endif	279	#endif
242	}	280	}
243	}	281	}
244		282
245	static void	283	static void
246	put_padlist (pTHX_ CV *cv)	284	put_padlist (CV *cv)
247	{	285	{
248	MAGIC mg = mg_find ((SV )cv, PERL_MAGIC_coro);	286	MAGIC *mg = CORO_MAGIC (cv);
		287	AV *av;
249		288
250	if (!mg)	289	if (!mg)
251	{	290	{
252	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	291	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
253	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	292	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
254	mg->mg_virtual = &vtbl_coro;	293	mg->mg_virtual = &vtbl_coro;
255	mg->mg_obj = (SV *)newAV ();	294	mg->mg_obj = (SV *)newAV ();
256	}	295	}
257		296
258	av_push ((AV )mg->mg_obj, (SV )CvPADLIST (cv));	297	av = (AV *)mg->mg_obj;
		298
		299	if (AvFILLp (av) >= AvMAX (av))
		300	av_extend (av, AvMAX (av) + 1);
		301
		302	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
259	}	303	}
260		304
261	#define SB do {	305	#define SB do {
262	#define SE } while (0)	306	#define SE } while (0)
263		307
264	#define LOAD(state) load_state(aTHX_ (state));
265	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
266
267	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	308	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
268		309
269	static void	310	static void
270	load_state(pTHX_ Coro__State c)	311	load_perl (Coro__State c)
271	{	312	{
272	PL_dowarn = c->dowarn;	313	#define VAR(name,type) PL_ ## name = c->name;
273	PL_in_eval = c->in_eval;	314	# include "state.h"
274		315	#undef VAR
275	PL_curstackinfo = c->curstackinfo;
276	PL_curstack = c->curstack;
277	PL_mainstack = c->mainstack;
278	PL_stack_sp = c->stack_sp;
279	PL_op = c->op;
280	PL_curpad = c->curpad;
281	PL_comppad = c->comppad;
282	PL_compcv = c->compcv;
283	PL_stack_base = c->stack_base;
284	PL_stack_max = c->stack_max;
285	PL_tmps_stack = c->tmps_stack;
286	PL_tmps_floor = c->tmps_floor;
287	PL_tmps_ix = c->tmps_ix;
288	PL_tmps_max = c->tmps_max;
289	PL_markstack = c->markstack;
290	PL_markstack_ptr = c->markstack_ptr;
291	PL_markstack_max = c->markstack_max;
292	PL_scopestack = c->scopestack;
293	PL_scopestack_ix = c->scopestack_ix;
294	PL_scopestack_max = c->scopestack_max;
295	PL_savestack = c->savestack;
296	PL_savestack_ix = c->savestack_ix;
297	PL_savestack_max = c->savestack_max;
298	#if PERL_VERSION < 9
299	PL_retstack = c->retstack;
300	PL_retstack_ix = c->retstack_ix;
301	PL_retstack_max = c->retstack_max;
302	#endif
303	PL_curpm = c->curpm;
304	PL_curcop = c->curcop;
305	PL_top_env = c->top_env;
306		316
307	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
308	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
309	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		320	if (c->irssv)
		321	{
		322	if (c->irssv == PL_rs \|\| sv_eq (PL_rs, c->irssv))
		323	SvREFCNT_dec (c->irssv);
		324	else
		325	{
		326	REPLACE_SV (PL_rs, c->irssv);
		327	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		328	sv_setsv (c->irssv_sv, PL_rs);
		329	}
		330	}
310		331
311	{	332	{
312	dSP;	333	dSP;
313	CV *cv;	334	CV *cv;
314		335
315	/* now do the ugly restore mess */	336	/* now do the ugly restore mess */
316	while ((cv = (CV *)POPs))	337	while ((cv = (CV *)POPs))
317	{	338	{
318	AV padlist = (AV )POPs;
319
320	if (padlist)
321	{
322	put_padlist (aTHX_ cv); /* mark this padlist as available */	339	put_padlist (cv); /* mark this padlist as available */
323	CvPADLIST(cv) = padlist;	340	CvDEPTH (cv) = PTR2IV (POPs);
324	}	341	CvPADLIST (cv) = (AV *)POPs;
325
326	++CvDEPTH(cv);
327	}	342	}
328		343
329	PUTBACK;	344	PUTBACK;
330	}	345	}
331	}	346	}
332		347
333	static void	348	static void
334	save_state(pTHX_ Coro__State c, int flags)	349	save_perl (Coro__State c)
335	{	350	{
336	{	351	{
337	dSP;	352	dSP;
338	I32 cxix = cxstack_ix;	353	I32 cxix = cxstack_ix;
339	PERL_CONTEXT *ccstk = cxstack;	354	PERL_CONTEXT *ccstk = cxstack;
…		…
342	/*	357	/*
343	* the worst thing you can imagine happens first - we have to save	358	* the worst thing you can imagine happens first - we have to save
344	* (and reinitialize) all cv's in the whole callchain :(	359	* (and reinitialize) all cv's in the whole callchain :(
345	*/	360	*/
346		361
		362	EXTEND (SP, 3 + 1);
347	PUSHs (Nullsv);	363	PUSHs (Nullsv);
348	/* this loop was inspired by pp_caller */	364	/* this loop was inspired by pp_caller */
349	for (;;)	365	for (;;)
350	{	366	{
351	while (cxix >= 0)	367	while (cxix >= 0)
352	{	368	{
353	PERL_CONTEXT *cx = &ccstk[cxix--];	369	PERL_CONTEXT *cx = &ccstk[cxix--];
354		370
355	if (CxTYPE(cx) == CXt_SUB)	371	if (CxTYPE (cx) == CXt_SUB)
356	{	372	{
357	CV *cv = cx->blk_sub.cv;	373	CV *cv = cx->blk_sub.cv;
		374
358	if (CvDEPTH(cv))	375	if (CvDEPTH (cv))
359	{	376	{
360	EXTEND (SP, CvDEPTH(cv)*2);	377	EXTEND (SP, 3);
361
362	while (--CvDEPTH(cv))
363	{
364	/* this tells the restore code to increment CvDEPTH */
365	PUSHs (Nullsv);
366	PUSHs ((SV *)cv);
367	}
368
369	PUSHs ((SV *)CvPADLIST(cv));	378	PUSHs ((SV *)CvPADLIST (cv));
		379	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
370	PUSHs ((SV *)cv);	380	PUSHs ((SV *)cv);
371		381
		382	CvDEPTH (cv) = 0;
372	get_padlist (aTHX_ cv);	383	get_padlist (cv);
373	}	384	}
374	}	385	}
375	#ifdef CXt_FORMAT
376	else if (CxTYPE(cx) == CXt_FORMAT)
377	{
378	/* I never used formats, so how should I know how these are implemented? */
379	/* my bold guess is as a simple, plain sub... */
380	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
381	}
382	#endif
383	}	386	}
384		387
385	if (top_si->si_type == PERLSI_MAIN)	388	if (top_si->si_type == PERLSI_MAIN)
386	break;	389	break;
387		390
…		…
391	}	394	}
392		395
393	PUTBACK;	396	PUTBACK;
394	}	397	}
395		398
396	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	399	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
397	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	400	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
398	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	401	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		402	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
399		403
400	c->dowarn = PL_dowarn;	404	#define VAR(name,type)c->name = PL_ ## name;
401	c->in_eval = PL_in_eval;	405	# include "state.h"
402		406	#undef VAR
403	c->curstackinfo = PL_curstackinfo;
404	c->curstack = PL_curstack;
405	c->mainstack = PL_mainstack;
406	c->stack_sp = PL_stack_sp;
407	c->op = PL_op;
408	c->curpad = PL_curpad;
409	c->comppad = PL_comppad;
410	c->compcv = PL_compcv;
411	c->stack_base = PL_stack_base;
412	c->stack_max = PL_stack_max;
413	c->tmps_stack = PL_tmps_stack;
414	c->tmps_floor = PL_tmps_floor;
415	c->tmps_ix = PL_tmps_ix;
416	c->tmps_max = PL_tmps_max;
417	c->markstack = PL_markstack;
418	c->markstack_ptr = PL_markstack_ptr;
419	c->markstack_max = PL_markstack_max;
420	c->scopestack = PL_scopestack;
421	c->scopestack_ix = PL_scopestack_ix;
422	c->scopestack_max = PL_scopestack_max;
423	c->savestack = PL_savestack;
424	c->savestack_ix = PL_savestack_ix;
425	c->savestack_max = PL_savestack_max;
426	#if PERL_VERSION < 9
427	c->retstack = PL_retstack;
428	c->retstack_ix = PL_retstack_ix;
429	c->retstack_max = PL_retstack_max;
430	#endif
431	c->curpm = PL_curpm;
432	c->curcop = PL_curcop;
433	c->top_env = PL_top_env;
434	}	407	}
435		408
436	/*	409	/*
437	* allocate various perl stacks. This is an exact copy	410	* allocate various perl stacks. This is an exact copy
438	* of perl.c:init_stacks, except that it uses less memory	411	* of perl.c:init_stacks, except that it uses less memory
439	* on the (sometimes correct) assumption that coroutines do	412	* on the (sometimes correct) assumption that coroutines do
440	* not usually need a lot of stackspace.	413	* not usually need a lot of stackspace.
441	*/	414	*/
		415	#if PREFER_PERL_FUNCTIONS
		416	# define coro_init_stacks init_stacks
		417	#else
442	static void	418	static void
443	coro_init_stacks (pTHX)	419	coro_init_stacks ()
444	{	420	{
445	LOCK;
446
447	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	421	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
448	PL_curstackinfo->si_type = PERLSI_MAIN;	422	PL_curstackinfo->si_type = PERLSI_MAIN;
449	PL_curstack = PL_curstackinfo->si_stack;	423	PL_curstack = PL_curstackinfo->si_stack;
450	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	424	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
451		425
452	PL_stack_base = AvARRAY(PL_curstack);	426	PL_stack_base = AvARRAY(PL_curstack);
453	PL_stack_sp = PL_stack_base;	427	PL_stack_sp = PL_stack_base;
454	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	428	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
455		429
456	New(50,PL_tmps_stack,96,SV*);	430	New(50,PL_tmps_stack,128,SV*);
457	PL_tmps_floor = -1;	431	PL_tmps_floor = -1;
458	PL_tmps_ix = -1;	432	PL_tmps_ix = -1;
459	PL_tmps_max = 96;	433	PL_tmps_max = 128;
460		434
461	New(54,PL_markstack,16,I32);	435	New(54,PL_markstack,32,I32);
462	PL_markstack_ptr = PL_markstack;	436	PL_markstack_ptr = PL_markstack;
463	PL_markstack_max = PL_markstack + 16;	437	PL_markstack_max = PL_markstack + 32;
464		438
465	#ifdef SET_MARK_OFFSET	439	#ifdef SET_MARK_OFFSET
466	SET_MARK_OFFSET;	440	SET_MARK_OFFSET;
467	#endif	441	#endif
468		442
469	New(54,PL_scopestack,16,I32);	443	New(54,PL_scopestack,32,I32);
470	PL_scopestack_ix = 0;	444	PL_scopestack_ix = 0;
471	PL_scopestack_max = 16;	445	PL_scopestack_max = 32;
472		446
473	New(54,PL_savestack,96,ANY);	447	New(54,PL_savestack,64,ANY);
474	PL_savestack_ix = 0;	448	PL_savestack_ix = 0;
475	PL_savestack_max = 96;	449	PL_savestack_max = 64;
476		450
477	#if PERL_VERSION < 9	451	#if !PERL_VERSION_ATLEAST (5,9,0)
478	New(54,PL_retstack,8,OP*);	452	New(54,PL_retstack,16,OP*);
479	PL_retstack_ix = 0;	453	PL_retstack_ix = 0;
480	PL_retstack_max = 8;	454	PL_retstack_max = 16;
481	#endif	455	#endif
482
483	UNLOCK;
484	}	456	}
		457	#endif
485		458
486	/*	459	/*
487	* destroy the stacks, the callchain etc...	460	* destroy the stacks, the callchain etc...
488	*/	461	*/
489	static void	462	static void
490	destroy_stacks(pTHX)	463	coro_destroy_stacks ()
491	{	464	{
492	if (!IN_DESTRUCT)	465	if (!IN_DESTRUCT)
493	{	466	{
494	/* is this ugly, I ask? */	467	/* restore all saved variables and stuff */
495	LEAVE_SCOPE (0);	468	LEAVE_SCOPE (0);
		469	assert (PL_tmps_floor == -1);
496		470
497	/* sure it is, but more important: is it correct?? :/ */	471	/* free all temporaries */
498	FREETMPS;	472	FREETMPS;
		473	assert (PL_tmps_ix == -1);
499		474
500	/POPSTACK_TO (PL_mainstack);//D//use/	475	POPSTACK_TO (PL_mainstack);
501	}	476	}
502		477
503	while (PL_curstackinfo->si_next)	478	while (PL_curstackinfo->si_next)
504	PL_curstackinfo = PL_curstackinfo->si_next;	479	PL_curstackinfo = PL_curstackinfo->si_next;
505		480
506	while (PL_curstackinfo)	481	while (PL_curstackinfo)
507	{	482	{
508	PERL_SI *p = PL_curstackinfo->si_prev;	483	PERL_SI *p = PL_curstackinfo->si_prev;
509		484
510	{ /D//remove/
511	dSP;
512	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
513	PUTBACK; /* possibly superfluous */
514	}
515
516	if (!IN_DESTRUCT)	485	if (!IN_DESTRUCT)
517	{
518	dounwind (-1);/D//remove/
519	SvREFCNT_dec (PL_curstackinfo->si_stack);	486	SvREFCNT_dec (PL_curstackinfo->si_stack);
520	}
521		487
522	Safefree (PL_curstackinfo->si_cxstack);	488	Safefree (PL_curstackinfo->si_cxstack);
523	Safefree (PL_curstackinfo);	489	Safefree (PL_curstackinfo);
524	PL_curstackinfo = p;	490	PL_curstackinfo = p;
525	}	491	}
526		492
527	Safefree (PL_tmps_stack);	493	Safefree (PL_tmps_stack);
528	Safefree (PL_markstack);	494	Safefree (PL_markstack);
529	Safefree (PL_scopestack);	495	Safefree (PL_scopestack);
530	Safefree (PL_savestack);	496	Safefree (PL_savestack);
531	#if PERL_VERSION < 9	497	#if !PERL_VERSION_ATLEAST (5,9,0)
532	Safefree (PL_retstack);	498	Safefree (PL_retstack);
533	#endif	499	#endif
534	}	500	}
535		501
536	static void	502	static void
537	allocate_stack (Coro__State ctx, int alloc)	503	setup_coro (struct coro *coro)
538	{
539	coro_stack *stack;
540
541	New (0, stack, 1, coro_stack);
542
543	stack->refcnt = 1;
544	stack->usecnt = 1;
545	stack->gencnt = ctx->gencnt = 0;
546
547	if (alloc)
548	{
549	#if HAVE_MMAP
550	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */
551	stack->sptr = mmap (0, stack->ssize, PROT_EXEC\|PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, 0, 0);
552	if (stack->sptr != (void *)-1)
553	{
554	# if STACKGUARD
555	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
556	# endif
557	}
558	else
559	#endif
560	{
561	stack->ssize = - (STACKSIZE * (long)sizeof (long));
562	New (0, stack->sptr, STACKSIZE, long);
563	}
564	}
565	else
566	stack->sptr = 0;
567
568	ctx->stack = stack;
569	}
570
571	static void
572	deallocate_stack (Coro__State ctx)
573	{
574	coro_stack *stack = ctx->stack;
575
576	ctx->stack = 0;
577
578	if (stack)
579	{
580	if (!--stack->refcnt)
581	{
582	#ifdef HAVE_MMAP
583	if (stack->ssize > 0 && stack->sptr)
584	munmap (stack->sptr, stack->ssize);
585	else
586	#endif
587	Safefree (stack->sptr);
588
589	Safefree (stack);
590	}
591	else if (ctx->gencnt == stack->gencnt)
592	--stack->usecnt;
593	}
594	}
595
596	static void
597	setup_coro (void *arg)
598	{	504	{
599	/*	505	/*
600	* emulate part of the perl startup here.	506	* emulate part of the perl startup here.
601	*/	507	*/
602	dTHX;	508
		509	coro_init_stacks ();
		510
		511	PL_curcop = &PL_compiling;
		512	PL_in_eval = EVAL_NULL;
		513	PL_curpm = 0;
		514	PL_localizing = 0;
		515	PL_dirty = 0;
		516	PL_restartop = 0;
		517
		518	{
		519	dSP;
		520	LOGOP myop;
		521
		522	SvREFCNT_dec (GvAV (PL_defgv));
		523	GvAV (PL_defgv) = coro->args; coro->args = 0;
		524
		525	Zero (&myop, 1, LOGOP);
		526	myop.op_next = Nullop;
		527	myop.op_flags = OPf_WANT_VOID;
		528
		529	PUSHMARK (SP);
		530	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		531	PUTBACK;
		532	PL_op = (OP *)&myop;
		533	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		534	SPAGAIN;
		535	}
		536
		537	ENTER; /* necessary e.g. for dounwind */
		538	}
		539
		540	static void
		541	free_coro_mortal ()
		542	{
		543	if (coro_mortal)
		544	{
		545	SvREFCNT_dec (coro_mortal);
		546	coro_mortal = 0;
		547	}
		548	}
		549
		550	/* inject a fake call to Coro::State::_cctx_init into the execution */
		551	static void NOINLINE
		552	prepare_cctx (coro_cctx *cctx)
		553	{
603	dSP;	554	dSP;
604	Coro__State ctx = (Coro__State)arg;	555	LOGOP myop;
605	SV sub_init = (SV )get_cv (SUB_INIT, FALSE);
606		556
607	coro_init_stacks (aTHX);	557	Zero (&myop, 1, LOGOP);
608	/PL_curcop = 0;/	558	myop.op_next = PL_op;
609	/PL_in_eval = PL_in_eval;/ /* inherit */	559	myop.op_flags = OPf_WANT_VOID \| OPf_STACKED;
610	SvREFCNT_dec (GvAV (PL_defgv));
611	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
612		560
		561	PUSHMARK (SP);
		562	EXTEND (SP, 2);
		563	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		564	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		565	PUTBACK;
		566	PL_op = (OP *)&myop;
		567	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
613	SPAGAIN;	568	SPAGAIN;
614
615	if (ctx->stack)
616	{
617	ctx->cursp = 0;
618
619	PUSHMARK(SP);
620	PUTBACK;
621	(void) call_sv (sub_init, G_VOID\|G_NOARGS\|G_EVAL);
622
623	if (SvTRUE (ERRSV))
624	croak (NULL);
625	else
626	croak ("FATAL: CCTXT coroutine returned!");
627	}
628	else
629	{
630	UNOP myop;
631
632	Zero(&myop, 1, UNOP);
633	myop.op_next = Nullop;
634	myop.op_flags = OPf_WANT_VOID;
635
636	PL_op = (OP *)&myop;
637
638	PUSHMARK(SP);
639	XPUSHs (sub_init);
640	/*
641	* the next line is slightly wrong, as PL_op->op_next
642	* is actually being executed so we skip the first op.
643	* that doesn't matter, though, since it is only
644	* pp_nextstate and we never return...
645	* ah yes, and I don't care anyways ;)
646	*/
647	PUTBACK;
648	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
649	SPAGAIN;
650
651	ENTER; /* necessary e.g. for dounwind */
652	}
653	}	569	}
654		570
655	static void	571	static void
656	continue_coro (void *arg)	572	coro_run (void *arg)
657	{	573	{
		574	/* coro_run is the alternative tail of transfer(), so unlock here. */
		575	UNLOCK;
		576
658	/*	577	/*
659	* this is a _very_ stripped down perl interpreter ;)	578	* this is a _very_ stripped down perl interpreter ;)
660	*/	579	*/
661	dTHX;
662	Coro__State ctx = (Coro__State)arg;
663
664	PL_top_env = &PL_start_env;	580	PL_top_env = &PL_start_env;
665		581
666	ctx->cursp = 0;	582	/* inject call to cctx_init */
667	PL_op = PL_op->op_next;	583	prepare_cctx ((coro_cctx *)arg);
668	CALLRUNOPS(aTHX);
669		584
		585	/* somebody will hit me for both perl_run and PL_restartop */
		586	PL_restartop = PL_op;
		587	perl_run (PL_curinterp);
		588
		589	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
670	abort ();	590	abort ();
671	}	591	}
672		592
		593	static coro_cctx *
		594	cctx_new ()
		595	{
		596	coro_cctx *cctx;
		597
		598	++cctx_count;
		599
		600	Newz (0, cctx, 1, coro_cctx);
		601
		602	#if HAVE_MMAP
		603
		604	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		605	/* mmap supposedly does allocate-on-write for us */
		606	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC\|PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, 0, 0);
		607
		608	if (cctx->sptr == (void *)-1)
		609	{
		610	perror ("FATAL: unable to mmap stack for coroutine");
		611	_exit (EXIT_FAILURE);
		612	}
		613
		614	# if STACKGUARD
		615	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		616	# endif
		617
		618	#else
		619
		620	cctx->ssize = STACKSIZE * (long)sizeof (long);
		621	New (0, cctx->sptr, STACKSIZE, long);
		622
		623	if (!cctx->sptr)
		624	{
		625	perror ("FATAL: unable to malloc stack for coroutine");
		626	_exit (EXIT_FAILURE);
		627	}
		628
		629	#endif
		630
		631	#if USE_VALGRIND
		632	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		633	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		634	cctx->ssize + (char *)cctx->sptr
		635	);
		636	#endif
		637
		638	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		639
		640	return cctx;
		641	}
		642
		643	static void
		644	cctx_destroy (coro_cctx *cctx)
		645	{
		646	if (!cctx)
		647	return;
		648
		649	--cctx_count;
		650
		651	#if USE_VALGRIND
		652	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		653	#endif
		654
		655	#if HAVE_MMAP
		656	munmap (cctx->sptr, cctx->ssize);
		657	#else
		658	Safefree (cctx->sptr);
		659	#endif
		660
		661	Safefree (cctx);
		662	}
		663
		664	static coro_cctx *
		665	cctx_get ()
		666	{
		667	coro_cctx *cctx;
		668
		669	if (cctx_first)
		670	{
		671	cctx = cctx_first;
		672	cctx_first = cctx->next;
		673	--cctx_idle;
		674	}
		675	else
		676	{
		677	cctx = cctx_new ();
		678	PL_op = PL_op->op_next;
		679	}
		680
		681	return cctx;
		682	}
		683
		684	static void
		685	cctx_put (coro_cctx *cctx)
		686	{
		687	/* free another cctx if overlimit */
		688	if (cctx_idle >= MAX_IDLE_CCTX)
		689	{
		690	coro_cctx *first = cctx_first;
		691	cctx_first = first->next;
		692	--cctx_idle;
		693
		694	assert (!first->inuse);
		695	cctx_destroy (first);
		696	}
		697
		698	++cctx_idle;
		699	cctx->next = cctx_first;
		700	cctx_first = cctx;
		701	}
		702
673	/* never call directly, always through the coro_state_transfer global variable */	703	/* never call directly, always through the coro_state_transfer global variable */
674	static void	704	static void NOINLINE
675	transfer_impl (pTHX_ struct coro prev, struct coro next, int flags)	705	transfer (struct coro prev, struct coro next)
676	{	706	{
677	dSTACKLEVEL;	707	dSTACKLEVEL;
678		708
		709	/* sometimes transfer is only called to set idle_sp */
		710	if (!next)
		711	{
		712	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		713	assert (((coro_cctx )prev)->top_env = PL_top_env); / just for the side effetc when assert is enabled */
		714	}
679	if (prev != next)	715	else if (prev != next)
680	{	716	{
681	/* has this coro been created yet? */	717	coro_cctx *prev__cctx;
682	if (next->mainstack)	718
		719	if (prev->flags & CF_NEW)
683	{	720	{
684	LOCK;	721	/* create a new empty context */
685	SAVE (prev, flags);	722	Newz (0, prev->cctx, 1, coro_cctx);
686	LOAD (next);	723	prev->cctx->inuse = 1;
687	UNLOCK;	724	prev->flags &= ~CF_NEW;
688		725	prev->flags \|= CF_RUNNING;
689	/* mark this state as in-use */
690	next->mainstack = 0;
691	next->tmps_ix = -2;
692
693	/* stacklevel changed? if yes, grab the stack for us! */
694	if (flags & TRANSFER_SAVE_CCTXT)
695	{
696	if (!prev->stack)
697	allocate_stack (prev, 0);
698	else if (prev->cursp != stacklevel
699	&& prev->stack->usecnt > 1)
700	{
701	prev->gencnt = ++prev->stack->gencnt;
702	prev->stack->usecnt = 1;
703	}
704
705	/* has our stack been invalidated? */
706	if (next->stack && next->stack->gencnt != next->gencnt)
707	{
708	deallocate_stack (next);
709	allocate_stack (next, 1);
710	coro_create (&(next->stack->cctx),
711	continue_coro, (void *)next,
712	next->stack->sptr, labs (next->stack->ssize));
713	}
714
715	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
716	prev->cursp = stacklevel;
717	/* don't add any code here */
718	}
719	else
720	next->cursp = stacklevel;
721	}	726	}
722	else if (next->tmps_ix == -2)	727
723	croak ("tried to transfer to running coroutine");	728	/TODO: must not croak here /
		729	if (!prev->flags & CF_RUNNING)
		730	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		731
		732	if (next->flags & CF_RUNNING)
		733	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		734
		735	prev->flags &= ~CF_RUNNING;
		736	next->flags \|= CF_RUNNING;
		737
		738	LOCK;
		739
		740	if (next->flags & CF_NEW)
		741	{
		742	/* need to start coroutine */
		743	next->flags &= ~CF_NEW;
		744	/* first get rid of the old state */
		745	save_perl (prev);
		746	/* setup coroutine call */
		747	setup_coro (next);
		748	/* need a new stack */
		749	assert (!next->cctx);
		750	}
724	else	751	else
725	{	752	{
726	LOCK;	753	/* coroutine already started */
727	SAVE (prev, -1); /* first get rid of the old state */	754	save_perl (prev);
728	UNLOCK;	755	load_perl (next);
729
730	/* create the coroutine for the first time */
731	if (flags & TRANSFER_SAVE_CCTXT)
732	{
733	if (!prev->stack)
734	allocate_stack (prev, 0);
735
736	/* the new coroutine starts with start_env again */
737	PL_top_env = &PL_start_env;
738
739	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
740	{
741	setup_coro (next);
742	next->cursp = stacklevel;
743
744	prev->stack->refcnt++;
745	prev->stack->usecnt++;
746	next->stack = prev->stack;
747	next->gencnt = prev->gencnt;
748	}
749	else
750	{
751	assert (!next->stack);
752	allocate_stack (next, 1);
753	coro_create (&(next->stack->cctx),
754	setup_coro, (void *)next,
755	next->stack->sptr, labs (next->stack->ssize));
756	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
757	prev->cursp = stacklevel;
758	/* don't add any code here */
759	}
760	}
761	else
762	{
763	setup_coro (next);
764	next->cursp = stacklevel;
765	}
766	}	756	}
767	}
768		757
769	LOCK;	758	prev__cctx = prev->cctx;
770	if (coro_mortal)	759
771	{	760	/* possibly "free" the cctx */
772	SvREFCNT_dec (coro_mortal);	761	if (prev__cctx->idle_sp == STACKLEVEL)
		762	{
		763	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		764	assert (PL_top_env == prev__cctx->top_env);
		765
		766	prev->cctx = 0;
		767
		768	cctx_put (prev__cctx);
		769	prev__cctx->inuse = 0;
		770	}
		771
		772	if (!next->cctx)
		773	{
		774	next->cctx = cctx_get ();
		775	assert (!next->cctx->inuse);
		776	next->cctx->inuse = 1;
		777	}
		778
		779	if (prev__cctx != next->cctx)
		780	{
		781	prev__cctx->top_env = PL_top_env;
		782	PL_top_env = next->cctx->top_env;
		783	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		784	}
		785
773	coro_mortal = 0;	786	free_coro_mortal ();
774	}	787
775	UNLOCK;	788	UNLOCK;
		789	}
776	}	790	}
777		791
778	/* use this function pointer to call the above function */	792	struct transfer_args
779	/* this is done to increase chances of the compiler not inlining the call */	793	{
780	void (coro_state_transfer)(pTHX_ struct coro prev, struct coro *next, int flags) = transfer_impl;	794	struct coro prev, next;
		795	};
		796
		797	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
781		798
782	static void	799	static void
783	coro_state_destroy (struct coro *coro)	800	coro_state_destroy (struct coro *coro)
784	{	801	{
785	if (coro->refcnt--)	802	if (coro->refcnt--)
786	return;	803	return;
787		804
788	if (coro->mainstack && coro->mainstack != main_mainstack)	805	if (coro->mainstack && coro->mainstack != main_mainstack)
789	{	806	{
790	struct coro temp;	807	struct coro temp;
		808	Zero (&temp, 1, struct coro);
		809	temp.save = CORO_SAVE_ALL;
791		810
792	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	811	if (coro->flags & CF_RUNNING)
793	LOAD (aTHX_ coro);	812	croak ("FATAL: tried to destroy currently running coroutine");
794		813
		814	save_perl (&temp);
		815	load_perl (coro);
		816
795	destroy_stacks (aTHX);	817	coro_destroy_stacks ();
796		818
797	LOAD ((&temp)); /* this will get rid of defsv etc.. */	819	load_perl (&temp); /* this will get rid of defsv etc.. */
798		820
799	coro->mainstack = 0;	821	coro->mainstack = 0;
800	}	822	}
801		823
802	deallocate_stack (coro);	824	cctx_destroy (coro->cctx);
803	SvREFCNT_dec (coro->args);	825	SvREFCNT_dec (coro->args);
804	Safefree (coro);	826	Safefree (coro);
805	}	827	}
806		828
807	static int	829	static int
808	coro_state_clear (SV sv, MAGIC mg)	830	coro_state_clear (pTHX_ SV sv, MAGIC mg)
809	{	831	{
810	struct coro coro = (struct coro )mg->mg_ptr;	832	struct coro coro = (struct coro )mg->mg_ptr;
811	mg->mg_ptr = 0;	833	mg->mg_ptr = 0;
812		834
813	coro_state_destroy (coro);	835	coro_state_destroy (coro);
814		836
815	return 0;	837	return 0;
816	}	838	}
817		839
818	static int	840	static int
819	coro_state_dup (MAGIC mg, CLONE_PARAMS params)	841	coro_state_dup (pTHX_ MAGIC mg, CLONE_PARAMS params)
820	{	842	{
821	struct coro coro = (struct coro )mg->mg_ptr;	843	struct coro coro = (struct coro )mg->mg_ptr;
822		844
823	++coro->refcnt;	845	++coro->refcnt;
824		846
825	return 0;	847	return 0;
826	}	848	}
827		849
828	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	850	static MGVTBL coro_state_vtbl = {
		851	0, 0, 0, 0,
		852	coro_state_clear,
		853	0,
		854	#ifdef MGf_DUP
		855	coro_state_dup,
		856	#else
		857	# define MGf_DUP 0
		858	#endif
		859	};
829		860
830	static struct coro *	861	static struct coro *
831	SvSTATE (SV *coro)	862	SvSTATE (SV *coro)
832	{	863	{
833	HV *stash;	864	HV *stash;
…		…
848	assert (mg->mg_type == PERL_MAGIC_ext);	879	assert (mg->mg_type == PERL_MAGIC_ext);
849	return (struct coro *)mg->mg_ptr;	880	return (struct coro *)mg->mg_ptr;
850	}	881	}
851		882
852	static void	883	static void
		884	prepare_transfer (struct transfer_args ta, SV prev_sv, SV *next_sv)
		885	{
		886	ta->prev = SvSTATE (prev_sv);
		887	ta->next = SvSTATE (next_sv);
		888	}
		889
		890	static void
853	api_transfer (pTHX_ SV prev, SV next, int flags)	891	api_transfer (SV prev_sv, SV next_sv)
854	{	892	{
855	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	893	struct transfer_args ta;
		894
		895	prepare_transfer (&ta, prev_sv, next_sv);
		896	TRANSFER (ta);
		897	}
		898
		899	static int
		900	api_save (SV *coro_sv, int new_save)
		901	{
		902	struct coro *coro = SvSTATE (coro_sv);
		903	int old_save = coro->save;
		904
		905	if (new_save >= 0)
		906	coro->save = new_save;
		907
		908	return old_save;
856	}	909	}
857		910
858	/ Coro ******************************************************************/	911	/ Coro ******************************************************************/
859		912
860	#define PRIO_MAX 3	913	#define PRIO_MAX 3
…		…
863	#define PRIO_LOW -1	916	#define PRIO_LOW -1
864	#define PRIO_IDLE -3	917	#define PRIO_IDLE -3
865	#define PRIO_MIN -4	918	#define PRIO_MIN -4
866		919
867	/* for Coro.pm */	920	/* for Coro.pm */
868	static GV coro_current, coro_idle;	921	static SV *coro_current;
869	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	922	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
870	static int coro_nready;	923	static int coro_nready;
871		924
872	static void	925	static void
873	coro_enq (pTHX_ SV *sv)	926	coro_enq (SV *coro_sv)
874	{	927	{
875	int prio;
876
877	if (SvTYPE (sv) != SVt_PVHV)
878	croak ("Coro::ready tried to enqueue something that is not a coroutine");
879
880	prio = SvSTATE (sv)->prio;
881
882	av_push (coro_ready [prio - PRIO_MIN], sv);	928	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
883	coro_nready++;	929	coro_nready++;
884	}	930	}
885		931
886	static SV *	932	static SV *
887	coro_deq (pTHX_ int min_prio)	933	coro_deq (int min_prio)
888	{	934	{
889	int prio = PRIO_MAX - PRIO_MIN;	935	int prio = PRIO_MAX - PRIO_MIN;
890		936
891	min_prio -= PRIO_MIN;	937	min_prio -= PRIO_MIN;
892	if (min_prio < 0)	938	if (min_prio < 0)
…		…
900	}	946	}
901		947
902	return 0;	948	return 0;
903	}	949	}
904		950
905	static void	951	static int
906	api_ready (SV *coro)	952	api_ready (SV *coro_sv)
907	{	953	{
908	dTHX;	954	struct coro *coro;
909		955
910	if (SvROK (coro))	956	if (SvROK (coro_sv))
911	coro = SvRV (coro);	957	coro_sv = SvRV (coro_sv);
		958
		959	coro = SvSTATE (coro_sv);
		960
		961	if (coro->flags & CF_READY)
		962	return 0;
		963
		964	coro->flags \|= CF_READY;
912		965
913	LOCK;	966	LOCK;
914	coro_enq (aTHX_ SvREFCNT_inc (coro));	967	coro_enq (SvREFCNT_inc (coro_sv));
915	UNLOCK;	968	UNLOCK;
916	}
917		969
		970	return 1;
		971	}
		972
918	static void	973	static int
919	api_schedule (void)	974	api_is_ready (SV *coro_sv)
920	{	975	{
921	dTHX;	976	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		977	}
922		978
		979	static void
		980	prepare_schedule (struct transfer_args *ta)
		981	{
923	SV prev, next;	982	SV prev, next;
924	SV *current = GvSV (coro_current);
925		983
926	for (;;)	984	for (;;)
927	{	985	{
928	LOCK;	986	LOCK;
929
930	next = coro_deq (aTHX_ PRIO_MIN);	987	next = coro_deq (PRIO_MIN);
		988	UNLOCK;
931		989
932	if (next)	990	if (next)
933	break;	991	break;
934		992
935	UNLOCK;
936
937	{	993	{
938	dSP;	994	dSP;
939		995
940	ENTER;	996	ENTER;
941	SAVETMPS;	997	SAVETMPS;
942		998
943	PUSHMARK (SP);	999	PUSHMARK (SP);
944	PUTBACK;	1000	PUTBACK;
945	call_sv (GvSV (coro_idle), G_DISCARD);	1001	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
946		1002
947	FREETMPS;	1003	FREETMPS;
948	LEAVE;	1004	LEAVE;
949	}	1005	}
950	}	1006	}
951		1007
952	prev = SvRV (current);	1008	prev = SvRV (coro_current);
953	SvRV (current) = next;	1009	SvRV_set (coro_current, next);
954		1010
955	/* free this only after the transfer */	1011	/* free this only after the transfer */
		1012	LOCK;
		1013	free_coro_mortal ();
		1014	UNLOCK;
956	coro_mortal = prev;	1015	coro_mortal = prev;
957		1016
958	UNLOCK;	1017	assert (!SvROK(prev));//D
		1018	assert (!SvROK(next));//D
959		1019
960	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next),	1020	ta->prev = SvSTATE (prev);
961	TRANSFER_SAVE_ALL \| TRANSFER_LAZY_STACK);	1021	ta->next = SvSTATE (next);
962	}
963		1022
		1023	assert (ta->next->flags & CF_READY);
		1024	ta->next->flags &= ~CF_READY;
		1025	}
		1026
		1027	static void
		1028	prepare_cede (struct transfer_args *ta)
		1029	{
		1030	api_ready (coro_current);
		1031	prepare_schedule (ta);
		1032	}
		1033
964	static void	1034	static int
		1035	prepare_cede_notself (struct transfer_args *ta)
		1036	{
		1037	if (coro_nready)
		1038	{
		1039	SV *prev = SvRV (coro_current);
		1040	prepare_schedule (ta);
		1041	api_ready (prev);
		1042	return 1;
		1043	}
		1044	else
		1045	return 0;
		1046	}
		1047
		1048	static void
		1049	api_schedule (void)
		1050	{
		1051	struct transfer_args ta;
		1052
		1053	prepare_schedule (&ta);
		1054	TRANSFER (ta);
		1055	}
		1056
		1057	static int
965	api_cede (void)	1058	api_cede (void)
966	{	1059	{
967	dTHX;	1060	struct transfer_args ta;
968		1061
969	LOCK;	1062	prepare_cede (&ta);
970	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
971	UNLOCK;
972		1063
973	api_schedule ();	1064	if (ta.prev != ta.next)
		1065	{
		1066	TRANSFER (ta);
		1067	return 1;
		1068	}
		1069	else
		1070	return 0;
		1071	}
		1072
		1073	static int
		1074	api_cede_notself (void)
		1075	{
		1076	struct transfer_args ta;
		1077
		1078	if (prepare_cede_notself (&ta))
		1079	{
		1080	TRANSFER (ta);
		1081	return 1;
		1082	}
		1083	else
		1084	return 0;
974	}	1085	}
975		1086
976	MODULE = Coro::State PACKAGE = Coro::State	1087	MODULE = Coro::State PACKAGE = Coro::State
977		1088
978	PROTOTYPES: DISABLE	1089	PROTOTYPES: DISABLE
…		…
984	#endif	1095	#endif
985	BOOT_PAGESIZE;	1096	BOOT_PAGESIZE;
986		1097
987	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1098	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
988		1099
989	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1100	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
990	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1101	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
991	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1102	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1103	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
992	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1104	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
993		1105
994	main_mainstack = PL_mainstack;	1106	main_mainstack = PL_mainstack;
995		1107
996	coroapi.ver = CORO_API_VERSION;	1108	coroapi.ver = CORO_API_VERSION;
997	coroapi.transfer = api_transfer;	1109	coroapi.transfer = api_transfer;
…		…
1007	HV *hv;	1119	HV *hv;
1008	int i;	1120	int i;
1009		1121
1010	Newz (0, coro, 1, struct coro);	1122	Newz (0, coro, 1, struct coro);
1011	coro->args = newAV ();	1123	coro->args = newAV ();
1012		1124	coro->save = CORO_SAVE_ALL;
1013	for (i = 1; i < items; i++)	1125	coro->flags = CF_NEW;
1014	av_push (coro->args, newSVsv (ST (i)));
1015
1016	/coro->mainstack = 0; //actual work is done inside transfer /
1017	/coro->stack = 0;/
1018		1126
1019	hv = newHV ();	1127	hv = newHV ();
1020	sv_magicext ((SV )hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char )coro, 0)->mg_flags \|= MGf_DUP;	1128	sv_magicext ((SV )hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char )coro, 0)->mg_flags \|= MGf_DUP;
1021	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1129	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1130
		1131	for (i = 1; i < items; i++)
		1132	av_push (coro->args, newSVsv (ST (i)));
1022	}	1133	}
1023	OUTPUT:	1134	OUTPUT:
1024	RETVAL	1135	RETVAL
1025		1136
		1137	int
		1138	save (SV *coro, int new_save = -1)
		1139	CODE:
		1140	RETVAL = api_save (coro, new_save);
		1141	OUTPUT:
		1142	RETVAL
		1143
1026	void	1144	void
1027	transfer(prev, next, flags)	1145	_set_stacklevel (...)
1028	SV *prev	1146	ALIAS:
1029	SV *next	1147	Coro::State::transfer = 1
1030	int flags	1148	Coro::schedule = 2
		1149	Coro::cede = 3
		1150	Coro::cede_notself = 4
1031	CODE:	1151	CODE:
1032	PUTBACK;
1033	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);
1034	SPAGAIN;
1035
1036	int
1037	prio (Coro::State coro, int newprio = 0)
1038	ALIAS:
1039	nice = 1
1040	CODE:
1041	{	1152	{
1042	RETVAL = coro->prio;	1153	struct transfer_args ta;
1043		1154
1044	if (items > 1)	1155	switch (ix)
1045	{	1156	{
		1157	case 0:
		1158	ta.prev = (struct coro )INT2PTR (coro_cctx , SvIV (ST (0)));
		1159	ta.next = 0;
		1160	break;
		1161
		1162	case 1:
1046	if (ix)	1163	if (items != 2)
1047	newprio += coro->prio;	1164	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1048		1165
1049	if (newprio < PRIO_MIN) newprio = PRIO_MIN;	1166	prepare_transfer (&ta, ST (0), ST (1));
1050	if (newprio > PRIO_MAX) newprio = PRIO_MAX;	1167	break;
1051		1168
1052	coro->prio = newprio;	1169	case 2:
		1170	prepare_schedule (&ta);
		1171	break;
		1172
		1173	case 3:
		1174	prepare_cede (&ta);
		1175	break;
		1176
		1177	case 4:
		1178	if (!prepare_cede_notself (&ta))
		1179	XSRETURN_EMPTY;
		1180
		1181	break;
1053	}	1182	}
		1183
		1184	BARRIER;
		1185	TRANSFER (ta);
1054	}	1186	}
1055		1187
1056	void	1188	void
1057	_clone_state_from (SV dst, SV src)	1189	_clone_state_from (SV dst, SV src)
1058	CODE:	1190	CODE:
…		…
1070	int code	1202	int code
1071	PROTOTYPE: $	1203	PROTOTYPE: $
1072	CODE:	1204	CODE:
1073	_exit (code);	1205	_exit (code);
1074		1206
1075	MODULE = Coro::State PACKAGE = Coro::Cont	1207	int
		1208	cctx_count ()
		1209	CODE:
		1210	RETVAL = cctx_count;
		1211	OUTPUT:
		1212	RETVAL
1076		1213
1077	void	1214	int
1078	yield (...)	1215	cctx_idle ()
1079	PROTOTYPE: @	1216	CODE:
1080	CODE:	1217	RETVAL = cctx_idle;
1081	{	1218	OUTPUT:
1082	SV *yieldstack;	1219	RETVAL
1083	SV *sv;
1084	AV *defav = GvAV (PL_defgv);
1085	struct coro prev, next;
1086
1087	yieldstack = *hv_fetch (
1088	(HV *)SvRV (GvSV (coro_current)),
1089	"yieldstack", sizeof ("yieldstack") - 1,
1090	0
1091	);
1092
1093	/* set up @_ -- ugly */
1094	av_clear (defav);
1095	av_fill (defav, items - 1);
1096	while (items--)
1097	av_store (defav, items, SvREFCNT_inc (ST(items)));
1098
1099	sv = av_pop ((AV *)SvRV (yieldstack));
1100	prev = SvSTATE (av_fetch ((AV )SvRV (sv), 0, 0));
1101	next = SvSTATE (av_fetch ((AV )SvRV (sv), 1, 0));
1102	SvREFCNT_dec (sv);
1103
1104	coro_state_transfer (aTHX_ prev, next, 0);
1105	}
1106		1220
1107	MODULE = Coro::State PACKAGE = Coro	1221	MODULE = Coro::State PACKAGE = Coro
1108		1222
1109	BOOT:	1223	BOOT:
1110	{	1224	{
…		…
1117	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1231	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1118	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1232	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1119	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1233	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1120	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1234	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1121		1235
1122	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1236	coro_current = get_sv ("Coro::current", FALSE);
1123	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1237	SvREADONLY_on (coro_current);
1124		1238
1125	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1239	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1126	coro_ready[i] = newAV ();	1240	coro_ready[i] = newAV ();
1127		1241
1128	{	1242	{
1129	SV *sv = perl_get_sv("Coro::API", 1);	1243	SV *sv = perl_get_sv("Coro::API", 1);
1130		1244
1131	coroapi.schedule = api_schedule;	1245	coroapi.schedule = api_schedule;
		1246	coroapi.save = api_save;
1132	coroapi.cede = api_cede;	1247	coroapi.cede = api_cede;
		1248	coroapi.cede_notself = api_cede_notself;
1133	coroapi.ready = api_ready;	1249	coroapi.ready = api_ready;
		1250	coroapi.is_ready = api_is_ready;
1134	coroapi.nready = &coro_nready;	1251	coroapi.nready = &coro_nready;
1135	coroapi.current = coro_current;	1252	coroapi.current = coro_current;
1136		1253
1137	GCoroAPI = &coroapi;	1254	GCoroAPI = &coroapi;
1138	sv_setiv (sv, (IV)&coroapi);	1255	sv_setiv (sv, (IV)&coroapi);
1139	SvREADONLY_on (sv);	1256	SvREADONLY_on (sv);
1140	}	1257	}
1141	}	1258	}
1142		1259
1143	#if !PERL_MICRO
1144
1145	void	1260	void
1146	ready (self)	1261	_set_current (SV *current)
1147	SV * self
1148	PROTOTYPE: $	1262	PROTOTYPE: $
1149	CODE:	1263	CODE:
1150	api_ready (self);	1264	SvREFCNT_dec (SvRV (coro_current));
		1265	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1151		1266
1152	#endif	1267	int
		1268	prio (Coro::State coro, int newprio = 0)
		1269	ALIAS:
		1270	nice = 1
		1271	CODE:
		1272	{
		1273	RETVAL = coro->prio;
		1274
		1275	if (items > 1)
		1276	{
		1277	if (ix)
		1278	newprio = coro->prio - newprio;
		1279
		1280	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1281	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1282
		1283	coro->prio = newprio;
		1284	}
		1285	}
		1286	OUTPUT:
		1287	RETVAL
		1288
		1289	SV *
		1290	ready (SV *self)
		1291	PROTOTYPE: $
		1292	CODE:
		1293	RETVAL = boolSV (api_ready (self));
		1294	OUTPUT:
		1295	RETVAL
		1296
		1297	SV *
		1298	is_ready (SV *self)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	RETVAL = boolSV (api_is_ready (self));
		1302	OUTPUT:
		1303	RETVAL
1153		1304
1154	int	1305	int
1155	nready (...)	1306	nready (...)
1156	PROTOTYPE:	1307	PROTOTYPE:
1157	CODE:	1308	CODE:
1158	RETVAL = coro_nready;	1309	RETVAL = coro_nready;
1159	OUTPUT:	1310	OUTPUT:
1160	RETVAL	1311	RETVAL
1161		1312
1162	void	1313	MODULE = Coro::State PACKAGE = Coro::AIO
1163	schedule (...)	1314
1164	PROTOTYPE:	1315	SV *
		1316	_get_state ()
1165	CODE:	1317	CODE:
1166	api_schedule ();
1167
1168	void
1169	cede (...)
1170	PROTOTYPE:
1171	CODE:
1172	api_cede ();
1173
1174	# and these are hacks
1175	SV *
1176	_aio_get_state ()
1177	CODE:
1178	{	1318	{
1179	struct {	1319	struct io_state *data;
1180	int errorno;
1181	int laststype;
1182	int laststatval;
1183	Stat_t statcache;
1184	} data;
1185		1320
		1321	RETVAL = newSV (sizeof (struct io_state));
		1322	data = (struct io_state *)SvPVX (RETVAL);
		1323	SvCUR_set (RETVAL, sizeof (struct io_state));
		1324	SvPOK_only (RETVAL);
		1325
1186	data.errorno = errno;	1326	data->errorno = errno;
1187	data.laststype = PL_laststype;	1327	data->laststype = PL_laststype;
1188	data.laststatval = PL_laststatval;	1328	data->laststatval = PL_laststatval;
1189	data.statcache = PL_statcache;	1329	data->statcache = PL_statcache;
1190
1191	RETVAL = newSVpvn ((char *)&data, sizeof data);
1192	}	1330	}
1193	OUTPUT:	1331	OUTPUT:
1194	RETVAL	1332	RETVAL
1195		1333
1196	void	1334	void
1197	_aio_set_state (char *data_)	1335	_set_state (char *data_)
1198	PROTOTYPE: $	1336	PROTOTYPE: $
1199	CODE:	1337	CODE:
1200	{	1338	{
1201	struct {	1339	struct io_state data = (void )data_;
1202	int errorno;
1203	int laststype;
1204	int laststatval;
1205	Stat_t statcache;
1206	} data = (void )data_;
1207		1340
1208	errno = data->errorno;	1341	errno = data->errorno;
1209	PL_laststype = data->laststype;	1342	PL_laststype = data->laststype;
1210	PL_laststatval = data->laststatval;	1343	PL_laststatval = data->laststatval;
1211	PL_statcache = data->statcache;	1344	PL_statcache = data->statcache;
1212	}	1345	}
		1346

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Comparing Coro/Coro/State.xs (file contents): Revision 1.88 by root, Fri Nov 24 15:34:33 2006 UTC vs. Revision 1.131 by root, Fri Dec 29 11:37:49 2006 UTC

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Comparing Coro/Coro/State.xs (file contents):
Revision 1.88 by root, Fri Nov 24 15:34:33 2006 UTC vs.
Revision 1.131 by root, Fri Dec 29 11:37:49 2006 UTC