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

Comparing Coro/Coro/State.xs (file contents):
Revision 1.72 by root, Wed Feb 1 23:59:41 2006 UTC vs.
Revision 1.171 by root, Sat Sep 29 19:42:10 2007 UTC

…		…
		1	#include "libcoro/coro.c"
		2
1	#define PERL_NO_GET_CONTEXT	3	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"
4		4
5	#include "EXTERN.h"	5	#include "EXTERN.h"
6	#include "perl.h"	6	#include "perl.h"
7	#include "XSUB.h"	7	#include "XSUB.h"
8		8
9	#include "patchlevel.h"	9	#include "patchlevel.h"
10		10
11	#if PERL_VERSION < 6	11	#include <stdio.h>
		12	#include <errno.h>
		13	#include <assert.h>
		14
		15	#ifdef HAVE_MMAP
		16	# include <unistd.h>
		17	# include <sys/mman.h>
		18	# ifndef MAP_ANONYMOUS
		19	# ifdef MAP_ANON
		20	# define MAP_ANONYMOUS MAP_ANON
		21	# else
		22	# undef HAVE_MMAP
		23	# endif
		24	# endif
		25	# include <limits.h>
		26	# ifndef PAGESIZE
		27	# define PAGESIZE pagesize
		28	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		29	static long pagesize;
		30	# else
		31	# define BOOT_PAGESIZE (void)0
		32	# endif
		33	#else
		34	# define PAGESIZE 0
		35	# define BOOT_PAGESIZE (void)0
		36	#endif
		37
		38	#if CORO_USE_VALGRIND
		39	# include <valgrind/valgrind.h>
		40	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		41	#else
		42	# define REGISTER_STACK(cctx,start,end)
		43	#endif
		44
		45	/* the maximum number of idle cctx that will be pooled */
		46	#define MAX_IDLE_CCTX 8
		47
		48	#define PERL_VERSION_ATLEAST(a,b,c) \
		49	(PERL_REVISION > (a) \
		50	\|\| (PERL_REVISION == (a) \
		51	&& (PERL_VERSION > (b) \
		52	\|\| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		53
		54	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	55	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	56	# define PL_ppaddr ppaddr
14	# endif	57	# endif
15	# ifndef call_sv	58	# ifndef call_sv
16	# define call_sv perl_call_sv	59	# define call_sv perl_call_sv
27	# ifndef IS_PADCONST	70	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	71	# define IS_PADCONST(v) 0
29	# endif	72	# endif
30	#endif	73	#endif
31		74
32	#include <errno.h>	75	/* 5.8.7 */
33	#include <signal.h>	76	#ifndef SvRV_set
34		77	# define SvRV_set(s,v) SvRV(s) = (v)
35	#ifdef HAVE_MMAP
36	# include <unistd.h>
37	# include <sys/mman.h>
38	# ifndef MAP_ANONYMOUS
39	# ifdef MAP_ANON
40	# define MAP_ANONYMOUS MAP_ANON
41	# else
42	# undef HAVE_MMAP
43	# endif
44	# endif	78	#endif
45	#endif
46		79
47	#define SUB_INIT "Coro::State::initialize"	80	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
48	#define UCORO_STATE "_coro_state"	81	# undef CORO_STACKGUARD
		82	#endif
49		83
50	/* The next macro should declare a variable stacklevel that contains and approximation	84	#ifndef CORO_STACKGUARD
51	* to the current C stack pointer. Its property is that it changes with each call	85	# define CORO_STACKGUARD 0
52	* and should be unique. */	86	#endif
		87
		88	/* prefer perl internal functions over our own? */
		89	#ifndef CORO_PREFER_PERL_FUNCTIONS
		90	# define CORO_PREFER_PERL_FUNCTIONS 0
		91	#endif
		92
		93	/* The next macros try to return the current stack pointer, in an as
		94	* portable way as possible. */
		95	#define dSTACKLEVEL volatile char stacklevel
53	#define dSTACKLEVEL void *stacklevel = &stacklevel	96	#define STACKLEVEL ((void *)&stacklevel)
54		97
55	#define IN_DESTRUCT (PL_main_cv == Nullcv)	98	#define IN_DESTRUCT (PL_main_cv == Nullcv)
56		99
57	#define labs(l) ((l) >= 0 ? (l) : -(l))	100	#if __GNUC__ >= 3
		101	# define attribute(x) __attribute__(x)
		102	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		103	#else
		104	# define attribute(x)
		105	# define BARRIER
		106	#endif
		107
		108	#define NOINLINE attribute ((noinline))
58		109
59	#include "CoroAPI.h"	110	#include "CoroAPI.h"
60		111
61	#ifdef USE_ITHREADS	112	#ifdef USE_ITHREADS
62	static perl_mutex coro_mutex;	113	static perl_mutex coro_mutex;
…		…
65	#else	116	#else
66	# define LOCK (void)0	117	# define LOCK (void)0
67	# define UNLOCK (void)0	118	# define UNLOCK (void)0
68	#endif	119	#endif
69		120
		121	/* helper storage struct for Coro::AIO */
		122	struct io_state
		123	{
		124	int errorno;
		125	I32 laststype;
		126	int laststatval;
		127	Stat_t statcache;
		128	};
		129
		130	static size_t coro_stacksize = CORO_STACKSIZE;
70	static struct CoroAPI coroapi;	131	static struct CoroAPI coroapi;
71	static AV main_mainstack; / used to differentiate between $main and others */	132	static AV main_mainstack; / used to differentiate between $main and others */
		133	static JMPENV *main_top_env;
72	static HV *coro_state_stash;	134	static HV coro_state_stash, coro_stash;
73	static SV *ucoro_state_sv;
74	static U32 ucoro_state_hash;
75	static SV coro_mortal; / will be freed after next transfer */	135	static SV coro_mortal; / will be freed after next transfer */
76		136
77	/* this is actually not only the c stack but also c registers etc... */	137	/* async_pool helper stuff */
		138	static SV *sv_pool_rss;
		139	static SV *sv_pool_size;
		140	static AV *av_async_pool;
		141
		142	static struct coro_cctx *cctx_first;
		143	static int cctx_count, cctx_idle;
		144
		145	enum {
		146	CC_MAPPED = 0x01,
		147	CC_NOREUSE = 0x02, /* throw this away after tracing */
		148	CC_TRACE = 0x04,
		149	CC_TRACE_SUB = 0x08, /* trace sub calls */
		150	CC_TRACE_LINE = 0x10, /* trace each statement */
		151	CC_TRACE_ALL = CC_TRACE_SUB \| CC_TRACE_LINE,
		152	};
		153
		154	/* this is a structure representing a c-level coroutine */
78	typedef struct {	155	typedef struct coro_cctx {
79	int refcnt; /* pointer reference counter */	156	struct coro_cctx *next;
80	int usecnt; /* shared by how many coroutines */
81	int gencnt; /* generation counter */
82		157
		158	/* the stack */
		159	void *sptr;
		160	size_t ssize;
		161
		162	/* cpu state */
		163	void idle_sp; / sp of top-level transfer/schedule/cede call */
		164	JMPENV idle_te; / same as idle_sp, but for top_env, TODO: remove once stable */
		165	JMPENV *top_env;
83	coro_context cctx;	166	coro_context cctx;
84		167
85	void *sptr;	168	#if CORO_USE_VALGRIND
86	long ssize; /* positive == mmap, otherwise malloc */	169	int valgrind_id;
87	} coro_stack;	170	#endif
		171	unsigned char flags;
		172	} coro_cctx;
88		173
		174	enum {
		175	CF_RUNNING = 0x0001, /* coroutine is running */
		176	CF_READY = 0x0002, /* coroutine is ready */
		177	CF_NEW = 0x0004, /* has never been switched to */
		178	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		179	};
		180
		181	/* this is a structure representing a perl-level coroutine */
89	struct coro {	182	struct coro {
90	/* the top-level JMPENV for each coroutine, needed to catch dies. */	183	/* the c coroutine allocated to this perl coroutine, if any */
91	JMPENV start_env;	184	coro_cctx *cctx;
92
93	/* the optional C context */
94	coro_stack *stack;
95	void *cursp;
96	int gencnt;
97
98	/* optionally saved, might be zero */
99	AV *defav;
100	SV *defsv;
101	SV *errsv;
102
103	/* saved global state not related to stacks */
104	U8 dowarn;
105	I32 in_eval;
106
107	/* the stacks and related info (callchain etc..) */
108	PERL_SI *curstackinfo;
109	AV *curstack;
110	AV *mainstack;
111	SV **stack_sp;
112	OP *op;
113	SV **curpad;
114	AV *comppad;
115	CV *compcv;
116	SV **stack_base;
117	SV **stack_max;
118	SV **tmps_stack;
119	I32 tmps_floor;
120	I32 tmps_ix;
121	I32 tmps_max;
122	I32 *markstack;
123	I32 *markstack_ptr;
124	I32 *markstack_max;
125	I32 *scopestack;
126	I32 scopestack_ix;
127	I32 scopestack_max;
128	ANY *savestack;
129	I32 savestack_ix;
130	I32 savestack_max;
131	OP **retstack;
132	I32 retstack_ix;
133	I32 retstack_max;
134	PMOP *curpm;
135	COP *curcop;
136	JMPENV *top_env;
137		185
138	/* data associated with this coroutine (initial args) */	186	/* data associated with this coroutine (initial args) */
139	AV *args;	187	AV *args;
		188	int refcnt;
		189	int save; /* CORO_SAVE flags */
		190	int flags; /* CF_ flags */
		191
		192	/* optionally saved, might be zero */
		193	AV defav; / @_ */
		194	SV defsv; / $_ */
		195	SV errsv; / $@ */
		196	GV deffh; / default filehandle */
		197	SV irssv; / $/ */
		198	SV irssv_sv; / real $/ cache */
		199
		200	#define VAR(name,type) type name;
		201	# include "state.h"
		202	#undef VAR
		203
		204	/* coro process data */
		205	int prio;
		206
		207	/* linked list */
		208	struct coro next, prev;
		209	HV hv; / the perl hash associated with this coro, if any */
140	};	210	};
141		211
142	typedef struct coro *Coro__State;	212	typedef struct coro *Coro__State;
143	typedef struct coro *Coro__State_or_hashref;	213	typedef struct coro *Coro__State_or_hashref;
144		214
145	/* mostly copied from op.c:cv_clone2 */	215	/ Coro ******************************************************************/
146	STATIC AV *	216
147	clone_padlist (pTHX_ AV *protopadlist)	217	#define PRIO_MAX 3
		218	#define PRIO_HIGH 1
		219	#define PRIO_NORMAL 0
		220	#define PRIO_LOW -1
		221	#define PRIO_IDLE -3
		222	#define PRIO_MIN -4
		223
		224	/* for Coro.pm */
		225	static SV *coro_current;
		226	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		227	static int coro_nready;
		228	static struct coro *coro_first;
		229
		230	/ lowlevel stuff ********************************************************/
		231
		232	static AV *
		233	coro_clone_padlist (pTHX_ CV *cv)
148	{	234	{
149	AV *av;	235	AV *padlist = CvPADLIST (cv);
150	I32 ix;
151	AV protopad_name = (AV ) * av_fetch (protopadlist, 0, FALSE);
152	AV protopad = (AV ) * av_fetch (protopadlist, 1, FALSE);
153	SV **pname = AvARRAY (protopad_name);
154	SV **ppad = AvARRAY (protopad);
155	I32 fname = AvFILLp (protopad_name);
156	I32 fpad = AvFILLp (protopad);
157	AV newpadlist, newpad_name, *newpad;	236	AV newpadlist, newpad;
158	SV **npad;
159
160	newpad_name = newAV ();
161	for (ix = fname; ix >= 0; ix--)
162	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
163
164	newpad = newAV ();
165	av_fill (newpad, AvFILLp (protopad));
166	npad = AvARRAY (newpad);
167		237
168	newpadlist = newAV ();	238	newpadlist = newAV ();
169	AvREAL_off (newpadlist);	239	AvREAL_off (newpadlist);
170	av_store (newpadlist, 0, (SV *) newpad_name);	240	#if PERL_VERSION_ATLEAST (5,9,0)
		241	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		242	#else
		243	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		244	#endif
		245	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		246	--AvFILLp (padlist);
		247
		248	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
171	av_store (newpadlist, 1, (SV *) newpad);	249	av_store (newpadlist, 1, (SV *)newpad);
172
173	av = newAV (); /* will be @_ */
174	av_extend (av, 0);
175	av_store (newpad, 0, (SV *) av);
176	AvREIFY_on (av);
177
178	for (ix = fpad; ix > 0; ix--)
179	{
180	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
181
182	if (namesv && namesv != &PL_sv_undef)
183	{
184	char name = SvPVX (namesv); / XXX */
185
186	if (SvFLAGS (namesv) & SVf_FAKE \|\| *name == '&')
187	{ /* lexical from outside? */
188	npad[ix] = SvREFCNT_inc (ppad[ix]);
189	}
190	else
191	{ /* our own lexical */
192	SV *sv;
193	if (*name == '&')
194	sv = SvREFCNT_inc (ppad[ix]);
195	else if (*name == '@')
196	sv = (SV *) newAV ();
197	else if (*name == '%')
198	sv = (SV *) newHV ();
199	else
200	sv = NEWSV (0, 0);
201
202	#ifdef SvPADBUSY
203	if (!SvPADBUSY (sv))
204	#endif
205	SvPADMY_on (sv);
206
207	npad[ix] = sv;
208	}
209	}
210	else if (IS_PADGV (ppad[ix]) \|\| IS_PADCONST (ppad[ix]))
211	{
212	npad[ix] = SvREFCNT_inc (ppad[ix]);
213	}
214	else
215	{
216	SV *sv = NEWSV (0, 0);
217	SvPADTMP_on (sv);
218	npad[ix] = sv;
219	}
220	}
221
222	#if 0 /* return -ENOTUNDERSTOOD */
223	/* Now that vars are all in place, clone nested closures. */
224
225	for (ix = fpad; ix > 0; ix--) {
226	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
227	if (namesv
228	&& namesv != &PL_sv_undef
229	&& !(SvFLAGS(namesv) & SVf_FAKE)
230	&& *SvPVX(namesv) == '&'
231	&& CvCLONE(ppad[ix]))
232	{
233	CV kid = cv_clone((CV)ppad[ix]);
234	SvREFCNT_dec(ppad[ix]);
235	CvCLONE_on(kid);
236	SvPADMY_on(kid);
237	npad[ix] = (SV*)kid;
238	}
239	}
240	#endif
241		250
242	return newpadlist;	251	return newpadlist;
243	}	252	}
244		253
245	STATIC void	254	static void
246	free_padlist (pTHX_ AV *padlist)	255	free_padlist (pTHX_ AV *padlist)
247	{	256	{
248	/* may be during global destruction */	257	/* may be during global destruction */
249	if (SvREFCNT (padlist))	258	if (SvREFCNT (padlist))
250	{	259	{
…		…
264		273
265	SvREFCNT_dec ((SV*)padlist);	274	SvREFCNT_dec ((SV*)padlist);
266	}	275	}
267	}	276	}
268		277
269	STATIC int	278	static int
270	coro_cv_free (pTHX_ SV sv, MAGIC mg)	279	coro_cv_free (pTHX_ SV sv, MAGIC mg)
271	{	280	{
272	AV *padlist;	281	AV *padlist;
273	AV av = (AV )mg->mg_obj;	282	AV av = (AV )mg->mg_obj;
274		283
275	/* casting is fun. */	284	/* casting is fun. */
276	while (&PL_sv_undef != (SV )(padlist = (AV )av_pop (av)))	285	while (&PL_sv_undef != (SV )(padlist = (AV )av_pop (av)))
277	free_padlist (aTHX_ padlist);	286	free_padlist (aTHX_ padlist);
278		287
279	SvREFCNT_dec (av);	288	SvREFCNT_dec (av);
		289
		290	return 0;
280	}	291	}
281		292
282	#define PERL_MAGIC_coro PERL_MAGIC_ext	293	#define PERL_MAGIC_coro PERL_MAGIC_ext
283		294
284	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	295	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
285		296
		297	#define CORO_MAGIC(cv) \
		298	SvMAGIC (cv) \
		299	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		300	? SvMAGIC (cv) \
		301	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		302	: 0
		303
		304	static struct coro *
		305	SvSTATE_ (pTHX_ SV *coro)
		306	{
		307	HV *stash;
		308	MAGIC *mg;
		309
		310	if (SvROK (coro))
		311	coro = SvRV (coro);
		312
		313	stash = SvSTASH (coro);
		314	if (stash != coro_stash && stash != coro_state_stash)
		315	{
		316	/* very slow, but rare, check */
		317	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		318	croak ("Coro::State object required");
		319	}
		320
		321	mg = CORO_MAGIC (coro);
		322	return (struct coro *)mg->mg_ptr;
		323	}
		324
		325	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		326
286	/* the next two functions merely cache the padlists */	327	/* the next two functions merely cache the padlists */
287	STATIC void	328	static void
288	get_padlist (pTHX_ CV *cv)	329	get_padlist (pTHX_ CV *cv)
289	{	330	{
290	MAGIC mg = mg_find ((SV )cv, PERL_MAGIC_coro);	331	MAGIC *mg = CORO_MAGIC (cv);
		332	AV *av;
291		333
292	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	334	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
293	CvPADLIST (cv) = (AV )av_pop ((AV )mg->mg_obj);	335	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
294	else	336	else
		337	{
		338	#if CORO_PREFER_PERL_FUNCTIONS
		339	/* this is probably cleaner, but also slower? */
		340	CV *cp = Perl_cv_clone (cv);
		341	CvPADLIST (cv) = CvPADLIST (cp);
		342	CvPADLIST (cp) = 0;
		343	SvREFCNT_dec (cp);
		344	#else
295	CvPADLIST (cv) = clone_padlist (aTHX_ CvPADLIST (cv));	345	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		346	#endif
		347	}
296	}	348	}
297		349
298	STATIC void	350	static void
299	put_padlist (pTHX_ CV *cv)	351	put_padlist (pTHX_ CV *cv)
300	{	352	{
301	MAGIC mg = mg_find ((SV )cv, PERL_MAGIC_coro);	353	MAGIC *mg = CORO_MAGIC (cv);
		354	AV *av;
302		355
303	if (!mg)	356	if (!mg)
304	{	357	{
305	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	358	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
306	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	359	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
307	mg->mg_virtual = &vtbl_coro;	360	mg->mg_virtual = &vtbl_coro;
308	mg->mg_obj = (SV *)newAV ();	361	mg->mg_obj = (SV *)newAV ();
309	}	362	}
310		363
311	av_push ((AV )mg->mg_obj, (SV )CvPADLIST (cv));	364	av = (AV *)mg->mg_obj;
		365
		366	if (AvFILLp (av) >= AvMAX (av))
		367	av_extend (av, AvMAX (av) + 1);
		368
		369	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
312	}	370	}
		371
		372	/ load & save, init *****************************************************/
313		373
314	#define SB do {	374	#define SB do {
315	#define SE } while (0)	375	#define SE } while (0)
316		376
317	#define LOAD(state) load_state(aTHX_ (state));
318	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
319
320	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	377	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
321		378
322	static void	379	static void
323	load_state(pTHX_ Coro__State c)	380	load_perl (pTHX_ Coro__State c)
324	{	381	{
325	PL_dowarn = c->dowarn;	382	#define VAR(name,type) PL_ ## name = c->name;
326	PL_in_eval = c->in_eval;	383	# include "state.h"
327		384	#undef VAR
328	PL_curstackinfo = c->curstackinfo;
329	PL_curstack = c->curstack;
330	PL_mainstack = c->mainstack;
331	PL_stack_sp = c->stack_sp;
332	PL_op = c->op;
333	PL_curpad = c->curpad;
334	PL_comppad = c->comppad;
335	PL_compcv = c->compcv;
336	PL_stack_base = c->stack_base;
337	PL_stack_max = c->stack_max;
338	PL_tmps_stack = c->tmps_stack;
339	PL_tmps_floor = c->tmps_floor;
340	PL_tmps_ix = c->tmps_ix;
341	PL_tmps_max = c->tmps_max;
342	PL_markstack = c->markstack;
343	PL_markstack_ptr = c->markstack_ptr;
344	PL_markstack_max = c->markstack_max;
345	PL_scopestack = c->scopestack;
346	PL_scopestack_ix = c->scopestack_ix;
347	PL_scopestack_max = c->scopestack_max;
348	PL_savestack = c->savestack;
349	PL_savestack_ix = c->savestack_ix;
350	PL_savestack_max = c->savestack_max;
351	#if PERL_VERSION < 9
352	PL_retstack = c->retstack;
353	PL_retstack_ix = c->retstack_ix;
354	PL_retstack_max = c->retstack_max;
355	#endif
356	PL_curpm = c->curpm;
357	PL_curcop = c->curcop;
358	PL_top_env = c->top_env;
359		385
360	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	386	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
361	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	387	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
362	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	388	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		389	if (c->deffh) REPLACE_SV (PL_defoutgv , c->deffh);
		390
		391	if (c->irssv)
		392	{
		393	if (c->irssv == PL_rs \|\| sv_eq (PL_rs, c->irssv))
		394	{
		395	SvREFCNT_dec (c->irssv);
		396	c->irssv = 0;
		397	}
		398	else
		399	{
		400	REPLACE_SV (PL_rs, c->irssv);
		401	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		402	sv_setsv (c->irssv_sv, PL_rs);
		403	}
		404	}
363		405
364	{	406	{
365	dSP;	407	dSP;
366	CV *cv;	408	CV *cv;
367		409
368	/* now do the ugly restore mess */	410	/* now do the ugly restore mess */
369	while ((cv = (CV *)POPs))	411	while ((cv = (CV *)POPs))
370	{	412	{
371	AV padlist = (AV )POPs;
372
373	if (padlist)
374	{
375	put_padlist (aTHX_ cv); /* mark this padlist as available */	413	put_padlist (aTHX_ cv); /* mark this padlist as available */
376	CvPADLIST(cv) = padlist;	414	CvDEPTH (cv) = PTR2IV (POPs);
377	}	415	CvPADLIST (cv) = (AV *)POPs;
378
379	++CvDEPTH(cv);
380	}	416	}
381		417
382	PUTBACK;	418	PUTBACK;
383	}	419	}
384	}	420	}
385		421
386	static void	422	static void
387	save_state(pTHX_ Coro__State c, int flags)	423	save_perl (pTHX_ Coro__State c)
388	{	424	{
389	{	425	{
390	dSP;	426	dSP;
391	I32 cxix = cxstack_ix;	427	I32 cxix = cxstack_ix;
392	PERL_CONTEXT *ccstk = cxstack;	428	PERL_CONTEXT *ccstk = cxstack;
…		…
395	/*	431	/*
396	* the worst thing you can imagine happens first - we have to save	432	* the worst thing you can imagine happens first - we have to save
397	* (and reinitialize) all cv's in the whole callchain :(	433	* (and reinitialize) all cv's in the whole callchain :(
398	*/	434	*/
399		435
400	PUSHs (Nullsv);	436	XPUSHs (Nullsv);
401	/* this loop was inspired by pp_caller */	437	/* this loop was inspired by pp_caller */
402	for (;;)	438	for (;;)
403	{	439	{
404	while (cxix >= 0)	440	while (cxix >= 0)
405	{	441	{
406	PERL_CONTEXT *cx = &ccstk[cxix--];	442	PERL_CONTEXT *cx = &ccstk[cxix--];
407		443
408	if (CxTYPE(cx) == CXt_SUB)	444	if (CxTYPE (cx) == CXt_SUB \|\| CxTYPE (cx) == CXt_FORMAT)
409	{	445	{
410	CV *cv = cx->blk_sub.cv;	446	CV *cv = cx->blk_sub.cv;
		447
411	if (CvDEPTH(cv))	448	if (CvDEPTH (cv))
412	{	449	{
413	EXTEND (SP, CvDEPTH(cv)*2);	450	EXTEND (SP, 3);
414
415	while (--CvDEPTH(cv))
416	{
417	/* this tells the restore code to increment CvDEPTH */
418	PUSHs (Nullsv);
419	PUSHs ((SV *)cv);
420	}
421
422	PUSHs ((SV *)CvPADLIST(cv));	451	PUSHs ((SV *)CvPADLIST (cv));
		452	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
423	PUSHs ((SV *)cv);	453	PUSHs ((SV *)cv);
424		454
		455	CvDEPTH (cv) = 0;
425	get_padlist (aTHX_ cv); /* this is a monster */	456	get_padlist (aTHX_ cv);
426	}	457	}
427	}	458	}
428	#ifdef CXt_FORMAT
429	else if (CxTYPE(cx) == CXt_FORMAT)
430	{
431	/* I never used formats, so how should I know how these are implemented? */
432	/* my bold guess is as a simple, plain sub... */
433	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
434	}
435	#endif
436	}	459	}
437		460
438	if (top_si->si_type == PERLSI_MAIN)	461	if (top_si->si_type == PERLSI_MAIN)
439	break;	462	break;
440		463
441	top_si = top_si->si_prev;	464	top_si = top_si->si_prev;
442	ccstk = top_si->si_cxstack;	465	ccstk = top_si->si_cxstack;
443	cxix = top_si->si_cxix;	466	cxix = top_si->si_cxix;
444	}	467	}
445		468
446	PUTBACK;	469	PUTBACK;
447	}	470	}
448		471
449	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	472	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
450	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	473	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
451	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	474	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		475	c->deffh = c->save & CORO_SAVE_DEFFH ? (GV *)SvREFCNT_inc (PL_defoutgv) : 0;
		476	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
452		477
453	c->dowarn = PL_dowarn;	478	#define VAR(name,type)c->name = PL_ ## name;
454	c->in_eval = PL_in_eval;	479	# include "state.h"
455		480	#undef VAR
456	c->curstackinfo = PL_curstackinfo;
457	c->curstack = PL_curstack;
458	c->mainstack = PL_mainstack;
459	c->stack_sp = PL_stack_sp;
460	c->op = PL_op;
461	c->curpad = PL_curpad;
462	c->comppad = PL_comppad;
463	c->compcv = PL_compcv;
464	c->stack_base = PL_stack_base;
465	c->stack_max = PL_stack_max;
466	c->tmps_stack = PL_tmps_stack;
467	c->tmps_floor = PL_tmps_floor;
468	c->tmps_ix = PL_tmps_ix;
469	c->tmps_max = PL_tmps_max;
470	c->markstack = PL_markstack;
471	c->markstack_ptr = PL_markstack_ptr;
472	c->markstack_max = PL_markstack_max;
473	c->scopestack = PL_scopestack;
474	c->scopestack_ix = PL_scopestack_ix;
475	c->scopestack_max = PL_scopestack_max;
476	c->savestack = PL_savestack;
477	c->savestack_ix = PL_savestack_ix;
478	c->savestack_max = PL_savestack_max;
479	#if PERL_VERSION < 9
480	c->retstack = PL_retstack;
481	c->retstack_ix = PL_retstack_ix;
482	c->retstack_max = PL_retstack_max;
483	#endif
484	c->curpm = PL_curpm;
485	c->curcop = PL_curcop;
486	c->top_env = PL_top_env;
487	}	481	}
488		482
489	/*	483	/*
490	* allocate various perl stacks. This is an exact copy	484	* allocate various perl stacks. This is an exact copy
491	* of perl.c:init_stacks, except that it uses less memory	485	* of perl.c:init_stacks, except that it uses less memory
492	* on the (sometimes correct) assumption that coroutines do	486	* on the (sometimes correct) assumption that coroutines do
493	* not usually need a lot of stackspace.	487	* not usually need a lot of stackspace.
494	*/	488	*/
495	STATIC void	489	#if CORO_PREFER_PERL_FUNCTIONS
		490	# define coro_init_stacks init_stacks
		491	#else
		492	static void
496	coro_init_stacks (pTHX)	493	coro_init_stacks (pTHX)
497	{	494	{
498	LOCK;	495	PL_curstackinfo = new_stackinfo(64, 6);
499
500	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
501	PL_curstackinfo->si_type = PERLSI_MAIN;	496	PL_curstackinfo->si_type = PERLSI_MAIN;
502	PL_curstack = PL_curstackinfo->si_stack;	497	PL_curstack = PL_curstackinfo->si_stack;
503	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	498	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
504		499
505	PL_stack_base = AvARRAY(PL_curstack);	500	PL_stack_base = AvARRAY(PL_curstack);
506	PL_stack_sp = PL_stack_base;	501	PL_stack_sp = PL_stack_base;
507	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	502	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
508		503
509	New(50,PL_tmps_stack,96,SV*);	504	New(50,PL_tmps_stack,64,SV*);
510	PL_tmps_floor = -1;	505	PL_tmps_floor = -1;
511	PL_tmps_ix = -1;	506	PL_tmps_ix = -1;
512	PL_tmps_max = 96;	507	PL_tmps_max = 64;
513		508
514	New(54,PL_markstack,16,I32);	509	New(54,PL_markstack,16,I32);
515	PL_markstack_ptr = PL_markstack;	510	PL_markstack_ptr = PL_markstack;
516	PL_markstack_max = PL_markstack + 16;	511	PL_markstack_max = PL_markstack + 16;
517		512
…		…
521		516
522	New(54,PL_scopestack,16,I32);	517	New(54,PL_scopestack,16,I32);
523	PL_scopestack_ix = 0;	518	PL_scopestack_ix = 0;
524	PL_scopestack_max = 16;	519	PL_scopestack_max = 16;
525		520
526	New(54,PL_savestack,96,ANY);	521	New(54,PL_savestack,64,ANY);
527	PL_savestack_ix = 0;	522	PL_savestack_ix = 0;
528	PL_savestack_max = 96;	523	PL_savestack_max = 64;
529		524
530	#if PERL_VERSION < 9	525	#if !PERL_VERSION_ATLEAST (5,9,0)
531	New(54,PL_retstack,8,OP*);	526	New(54,PL_retstack,4,OP*);
532	PL_retstack_ix = 0;	527	PL_retstack_ix = 0;
533	PL_retstack_max = 8;	528	PL_retstack_max = 4;
534	#endif	529	#endif
535
536	UNLOCK;
537	}	530	}
		531	#endif
538		532
539	/*	533	/*
540	* destroy the stacks, the callchain etc...	534	* destroy the stacks, the callchain etc...
541	*/	535	*/
542	STATIC void	536	static void
543	destroy_stacks(pTHX)	537	coro_destroy_stacks (pTHX)
544	{	538	{
545	if (!IN_DESTRUCT)	539	if (!IN_DESTRUCT)
546	{	540	{
547	/* is this ugly, I ask? */	541	/* restore all saved variables and stuff */
548	LEAVE_SCOPE (0);	542	LEAVE_SCOPE (0);
		543	assert (PL_tmps_floor == -1);
549		544
550	/* sure it is, but more important: is it correct?? :/ */	545	/* free all temporaries */
551	FREETMPS;	546	FREETMPS;
		547	assert (PL_tmps_ix == -1);
552		548
		549	/* unwind all extra stacks */
553	/POPSTACK_TO (PL_mainstack);//D//use/	550	POPSTACK_TO (PL_mainstack);
		551
		552	/* unwind main stack */
		553	dounwind (-1);
554	}	554	}
555		555
556	while (PL_curstackinfo->si_next)	556	while (PL_curstackinfo->si_next)
557	PL_curstackinfo = PL_curstackinfo->si_next;	557	PL_curstackinfo = PL_curstackinfo->si_next;
558		558
559	while (PL_curstackinfo)	559	while (PL_curstackinfo)
560	{	560	{
561	PERL_SI *p = PL_curstackinfo->si_prev;	561	PERL_SI *p = PL_curstackinfo->si_prev;
562		562
563	{ /D//remove/
564	dSP;
565	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
566	PUTBACK; /* possibly superfluous */
567	}
568
569	if (!IN_DESTRUCT)	563	if (!IN_DESTRUCT)
570	{
571	dounwind (-1);/D//remove/
572	SvREFCNT_dec (PL_curstackinfo->si_stack);	564	SvREFCNT_dec (PL_curstackinfo->si_stack);
573	}
574		565
575	Safefree (PL_curstackinfo->si_cxstack);	566	Safefree (PL_curstackinfo->si_cxstack);
576	Safefree (PL_curstackinfo);	567	Safefree (PL_curstackinfo);
577	PL_curstackinfo = p;	568	PL_curstackinfo = p;
578	}	569	}
579		570
580	Safefree (PL_tmps_stack);	571	Safefree (PL_tmps_stack);
581	Safefree (PL_markstack);	572	Safefree (PL_markstack);
582	Safefree (PL_scopestack);	573	Safefree (PL_scopestack);
583	Safefree (PL_savestack);	574	Safefree (PL_savestack);
584	#if PERL_VERSION < 9	575	#if !PERL_VERSION_ATLEAST (5,9,0)
585	Safefree (PL_retstack);	576	Safefree (PL_retstack);
586	#endif	577	#endif
587	}	578	}
588		579
		580	static size_t
		581	coro_rss (pTHX_ struct coro *coro)
		582	{
		583	size_t rss = sizeof (coro);
		584
		585	if (coro->mainstack)
		586	{
		587	if (coro->flags & CF_RUNNING)
		588	{
		589	#define VAR(name,type)coro->name = PL_ ## name;
		590	# include "state.h"
		591	#undef VAR
		592	}
		593
		594	rss += sizeof (coro->curstackinfo);
		595	rss += sizeof (struct xpvav) + (1 + AvFILL (coro->curstackinfo->si_stack)) * sizeof (SV *);
		596	rss += (coro->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		597	rss += sizeof (struct xpvav) + (1 + AvFILL (coro->curstack)) * sizeof (SV *);
		598	rss += coro->tmps_max * sizeof (SV *);
		599	rss += (coro->markstack_max - coro->markstack_ptr) * sizeof (I32);
		600	rss += coro->scopestack_max * sizeof (I32);
		601	rss += coro->savestack_max * sizeof (ANY);
		602
		603	#if !PERL_VERSION_ATLEAST (5,9,0)
		604	rss += coro->retstack_max * sizeof (OP *);
		605	#endif
		606	}
		607
		608	return rss;
		609	}
		610
		611	/ coroutine stack handling **********************************************/
		612
589	static void	613	static void
590	allocate_stack (Coro__State ctx, int alloc)	614	setup_coro (pTHX_ struct coro *coro)
591	{
592	coro_stack *stack;
593
594	New (0, stack, 1, coro_stack);
595
596	stack->refcnt = 1;
597	stack->usecnt = 1;
598	stack->gencnt = ctx->gencnt = 0;
599
600	if (alloc)
601	{
602	#if HAVE_MMAP
603	stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */
604	stack->sptr = mmap (0, stack->ssize, PROT_EXEC\|PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, 0, 0);
605	if (stack->sptr == (void *)-1)
606	#endif
607	{
608	/FIXME//D//* reasonable stack size! */
609	stack->ssize = - (STACKSIZE * sizeof (long));
610	New (0, stack->sptr, STACKSIZE, long);
611	}
612	}
613	else
614	stack->sptr = 0;
615
616	ctx->stack = stack;
617	}
618
619	static void
620	deallocate_stack (Coro__State ctx)
621	{
622	coro_stack *stack = ctx->stack;
623
624	ctx->stack = 0;
625
626	if (stack)
627	{
628	if (!--stack->refcnt)
629	{
630	#ifdef HAVE_MMAP
631	if (stack->ssize > 0 && stack->sptr)
632	munmap (stack->sptr, stack->ssize);
633	else
634	#endif
635	Safefree (stack->sptr);
636
637	Safefree (stack);
638	}
639	else if (ctx->gencnt == stack->gencnt)
640	--stack->usecnt;
641	}
642	}
643
644	static void
645	setup_coro (void *arg)
646	{	615	{
647	/*	616	/*
648	* emulate part of the perl startup here.	617	* emulate part of the perl startup here.
649	*/	618	*/
		619	coro_init_stacks (aTHX);
		620
		621	PL_runops = RUNOPS_DEFAULT;
		622	PL_curcop = &PL_compiling;
		623	PL_in_eval = EVAL_NULL;
		624	PL_comppad = 0;
		625	PL_curpm = 0;
		626	PL_localizing = 0;
		627	PL_dirty = 0;
		628	PL_restartop = 0;
		629
		630	{
		631	dSP;
		632	LOGOP myop;
		633
		634	SvREFCNT_dec (GvAV (PL_defgv));
		635	GvAV (PL_defgv) = coro->args; coro->args = 0;
		636
		637	Zero (&myop, 1, LOGOP);
		638	myop.op_next = Nullop;
		639	myop.op_flags = OPf_WANT_VOID;
		640
		641	PUSHMARK (SP);
		642	XPUSHs (av_shift (GvAV (PL_defgv)));
		643	PUTBACK;
		644	PL_op = (OP *)&myop;
		645	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		646	SPAGAIN;
		647	}
		648
		649	ENTER; /* necessary e.g. for dounwind */
		650	}
		651
		652	static void
		653	free_coro_mortal (pTHX)
		654	{
		655	if (coro_mortal)
		656	{
		657	SvREFCNT_dec (coro_mortal);
		658	coro_mortal = 0;
		659	}
		660	}
		661
		662	static int
		663	runops_trace (pTHX)
		664	{
		665	COP *oldcop = 0;
		666	int oldcxix = -2;
		667	struct coro coro = SvSTATE (coro_current); / trace cctx is tied to specific coro */
		668	coro_cctx *cctx = coro->cctx;
		669
		670	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		671	{
		672	PERL_ASYNC_CHECK ();
		673
		674	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
		675	{
		676	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		677	SV bot, top;
		678	AV av = newAV (); / return values */
		679	SV **cb;
		680	runops_proc_t old_runops = PL_runops;
		681	dSP;
		682	ENTER;
		683	SAVETMPS;
		684	EXTEND (SP, 3);
		685	PL_runops = RUNOPS_DEFAULT;
		686
		687	GV *gv = CvGV (cx->blk_sub.cv);
		688	SV *fullname = sv_2mortal (newSV (0));
		689	if (isGV (gv))
		690	gv_efullname3 (fullname, gv, 0);
		691
		692	bot = PL_stack_base + cx->blk_oldsp + 1;
		693	top = cx->blk_gimme == G_ARRAY ? SP + 1
		694	: cx->blk_gimme == G_SCALAR ? bot + 1
		695	: bot;
		696
		697	while (bot < top)
		698	av_push (av, SvREFCNT_inc (*bot++));
		699
		700	PUSHMARK (SP);
		701	PUSHs (&PL_sv_no);
		702	PUSHs (fullname);
		703	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		704	PUTBACK;
		705	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		706	if (cb) call_sv (*cb, G_KEEPERR \| G_EVAL \| G_VOID \| G_DISCARD);
		707	SPAGAIN;
		708
		709	FREETMPS;
		710	LEAVE;
		711	PL_runops = old_runops;
		712	}
		713
		714	if (oldcop != PL_curcop)
		715	{
		716	oldcop = PL_curcop;
		717
		718	if (PL_curcop != &PL_compiling)
		719	{
		720	SV **cb;
		721	runops_proc_t old_runops = PL_runops;
		722	dSP;
		723	ENTER;
		724	SAVETMPS;
		725	EXTEND (SP, 3);
		726	PL_runops = RUNOPS_DEFAULT;
		727
		728	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
		729	{
		730	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		731
		732	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
		733	{
		734	GV *gv = CvGV (cx->blk_sub.cv);
		735	SV *fullname = sv_2mortal (newSV (0));
		736	if (isGV (gv))
		737	gv_efullname3 (fullname, gv, 0);
		738
		739	PUSHMARK (SP);
		740	PUSHs (&PL_sv_yes);
		741	PUSHs (fullname);
		742	PUSHs (cx->blk_sub.hasargs ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		743	PUTBACK;
		744	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		745	if (cb) call_sv (*cb, G_KEEPERR \| G_EVAL \| G_VOID \| G_DISCARD);
		746	SPAGAIN;
		747	}
		748
		749	oldcxix = cxstack_ix;
		750	}
		751
		752	if (cctx->flags & CC_TRACE_LINE)
		753	{
		754	PUSHMARK (SP);
		755	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		756	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		757	PUTBACK;
		758	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		759	if (cb) call_sv (*cb, G_KEEPERR \| G_EVAL \| G_VOID \| G_DISCARD);
		760	SPAGAIN;
		761	}
		762
		763	FREETMPS;
		764	LEAVE;
		765	PL_runops = old_runops;
		766	}
		767	}
		768	}
		769
		770	TAINT_NOT;
		771	return 0;
		772	}
		773
		774	/* inject a fake call to Coro::State::_cctx_init into the execution */
		775	/* _cctx_init should be careful, as it could be called at almost any time */
		776	/* during execution of a perl program */
		777	static void NOINLINE
		778	prepare_cctx (pTHX_ coro_cctx *cctx)
		779	{
		780	dSP;
		781	LOGOP myop;
		782
		783	PL_top_env = &PL_start_env;
		784
		785	if (cctx->flags & CC_TRACE)
		786	PL_runops = runops_trace;
		787
		788	Zero (&myop, 1, LOGOP);
		789	myop.op_next = PL_op;
		790	myop.op_flags = OPf_WANT_VOID \| OPf_STACKED;
		791
		792	PUSHMARK (SP);
		793	EXTEND (SP, 2);
		794	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		795	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		796	PUTBACK;
		797	PL_op = (OP *)&myop;
		798	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		799	SPAGAIN;
		800	}
		801
		802	/*
		803	* this is a _very_ stripped down perl interpreter ;)
		804	*/
		805	static void
		806	coro_run (void *arg)
		807	{
650	dTHX;	808	dTHX;
651	dSP;
652	Coro__State ctx = (Coro__State)arg;
653	SV sub_init = (SV )get_cv (SUB_INIT, FALSE);
654		809
655	coro_init_stacks (aTHX);	810	/* coro_run is the alternative tail of transfer(), so unlock here. */
656	/PL_curcop = 0;/	811	UNLOCK;
657	/PL_in_eval = PL_in_eval;/ /* inherit */
658	SvREFCNT_dec (GvAV (PL_defgv));
659	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
660		812
661	SPAGAIN;	813	/* we now skip the entersub that lead to transfer() */
		814	PL_op = PL_op->op_next;
662		815
663	if (ctx->stack)	816	/* inject a fake subroutine call to cctx_init */
664	{	817	prepare_cctx (aTHX_ (coro_cctx *)arg);
665	ctx->cursp = 0;
666		818
667	PUSHMARK(SP);	819	/* somebody or something will hit me for both perl_run and PL_restartop */
668	PUTBACK;	820	PL_restartop = PL_op;
669	(void) call_sv (sub_init, G_VOID\|G_NOARGS\|G_EVAL);	821	perl_run (PL_curinterp);
670		822
671	if (SvTRUE (ERRSV))	823	/*
672	croak (NULL);	824	* If perl-run returns we assume exit() was being called or the coro
673	else	825	* fell off the end, which seems to be the only valid (non-bug)
674	croak ("FATAL: CCTXT coroutine returned!");	826	* reason for perl_run to return. We try to exit by jumping to the
		827	* bootstrap-time "top" top_env, as we cannot restore the "main"
		828	* coroutine as Coro has no such concept
		829	*/
		830	PL_top_env = main_top_env;
		831	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		832	}
		833
		834	static coro_cctx *
		835	cctx_new ()
		836	{
		837	coro_cctx *cctx;
		838	void *stack_start;
		839	size_t stack_size;
		840
		841	++cctx_count;
		842
		843	Newz (0, cctx, 1, coro_cctx);
		844
		845	#if HAVE_MMAP
		846
		847	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		848	/* mmap supposedly does allocate-on-write for us */
		849	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC\|PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, 0, 0);
		850
		851	if (cctx->sptr != (void *)-1)
		852	{
		853	# if CORO_STACKGUARD
		854	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		855	# endif
		856	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		857	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		858	cctx->flags \|= CC_MAPPED;
675	}	859	}
676	else	860	else
677	{	861	#endif
678	UNOP myop;
679
680	PL_op = (OP *)&myop;
681
682	Zero(&myop, 1, UNOP);
683	myop.op_next = Nullop;
684	myop.op_flags = OPf_WANT_VOID;
685
686	PUSHMARK(SP);
687	XPUSHs (sub_init);
688	/*
689	* the next line is slightly wrong, as PL_op->op_next
690	* is actually being executed so we skip the first op.
691	* that doesn't matter, though, since it is only
692	* pp_nextstate and we never return...
693	* ah yes, and I don't care anyways ;)
694	*/
695	PUTBACK;
696	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
697	SPAGAIN;
698
699	ENTER; /* necessary e.g. for dounwind */
700	}	862	{
		863	cctx->ssize = coro_stacksize * (long)sizeof (long);
		864	New (0, cctx->sptr, coro_stacksize, long);
		865
		866	if (!cctx->sptr)
		867	{
		868	perror ("FATAL: unable to allocate stack for coroutine");
		869	_exit (EXIT_FAILURE);
		870	}
		871
		872	stack_start = cctx->sptr;
		873	stack_size = cctx->ssize;
		874	}
		875
		876	REGISTER_STACK (cctx, (char )stack_start, (char )stack_start + stack_size);
		877	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
		878
		879	return cctx;
701	}	880	}
702		881
703	static void	882	static void
704	continue_coro (void *arg)	883	cctx_destroy (coro_cctx *cctx)
705	{	884	{
706	/*	885	if (!cctx)
707	* this is a _very_ stripped down perl interpreter ;)	886	return;
708	*/
709	dTHX;
710	Coro__State ctx = (Coro__State)arg;
711	JMPENV coro_start_env;
712		887
713	PL_top_env = &ctx->start_env;	888	--cctx_count;
714		889
715	ctx->cursp = 0;	890	#if CORO_USE_VALGRIND
716	PL_op = PL_op->op_next;	891	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
717	CALLRUNOPS(aTHX);	892	#endif
718		893
719	abort ();	894	#if HAVE_MMAP
720	}	895	if (cctx->flags & CC_MAPPED)
		896	munmap (cctx->sptr, cctx->ssize);
		897	else
		898	#endif
		899	Safefree (cctx->sptr);
721		900
722	STATIC void	901	Safefree (cctx);
		902	}
		903
		904	static coro_cctx *
		905	cctx_get (pTHX)
		906	{
		907	while (cctx_first)
		908	{
		909	coro_cctx *cctx = cctx_first;
		910	cctx_first = cctx->next;
		911	--cctx_idle;
		912
		913	if (cctx->ssize >= coro_stacksize && !(cctx->flags & CC_NOREUSE))
		914	return cctx;
		915
		916	cctx_destroy (cctx);
		917	}
		918
		919	return cctx_new ();
		920	}
		921
		922	static void
		923	cctx_put (coro_cctx *cctx)
		924	{
		925	/* free another cctx if overlimit */
		926	if (cctx_idle >= MAX_IDLE_CCTX)
		927	{
		928	coro_cctx *first = cctx_first;
		929	cctx_first = first->next;
		930	--cctx_idle;
		931
		932	cctx_destroy (first);
		933	}
		934
		935	++cctx_idle;
		936	cctx->next = cctx_first;
		937	cctx_first = cctx;
		938	}
		939
		940	/ coroutine switching ***************************************************/
		941
		942	static void NOINLINE
		943	transfer_check (pTHX_ struct coro prev, struct coro next)
		944	{
		945	if (prev != next)
		946	{
		947	if (!(prev->flags & (CF_RUNNING \| CF_NEW)))
		948	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		949
		950	if (next->flags & CF_RUNNING)
		951	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		952
		953	if (next->flags & CF_DESTROYED)
		954	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		955
		956	if (PL_lex_state != LEX_NOTPARSING)
		957	croak ("Coro::State::transfer called while parsing, but this is not supported");
		958	}
		959	}
		960
		961	/* always use the TRANSFER macro */
		962	static void NOINLINE
723	transfer (pTHX_ struct coro prev, struct coro next, int flags)	963	transfer (pTHX_ struct coro prev, struct coro next)
724	{	964	{
725	dSTACKLEVEL;	965	dSTACKLEVEL;
726		966
		967	/* sometimes transfer is only called to set idle_sp */
		968	if (!next)
		969	{
		970	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		971	assert (((coro_cctx )prev)->idle_te = PL_top_env); / just for the side-effect when asserts are enabled */
		972	}
727	if (prev != next)	973	else if (prev != next)
728	{	974	{
729	if (next->mainstack)	975	coro_cctx *prev__cctx;
		976
		977	if (prev->flags & CF_NEW)
730	{	978	{
731	LOCK;	979	/* create a new empty context */
732	SAVE (prev, flags);	980	Newz (0, prev->cctx, 1, coro_cctx);
733	LOAD (next);	981	prev->flags &= ~CF_NEW;
734	UNLOCK;	982	prev->flags \|= CF_RUNNING;
735
736	/* mark this state as in-use */
737	next->mainstack = 0;
738	next->tmps_ix = -2;
739
740	/* stacklevel changed? if yes, grab the stack for us! */
741	if (flags & TRANSFER_SAVE_CCTXT)
742	{
743	if (!prev->stack)
744	allocate_stack (prev, 0);
745	else if (prev->cursp != stacklevel
746	&& prev->stack->usecnt > 1)
747	{
748	prev->gencnt = ++prev->stack->gencnt;
749	prev->stack->usecnt = 1;
750	}
751
752	/* has our stack been invalidated? */
753	if (next->stack && next->stack->gencnt != next->gencnt)
754	{
755	deallocate_stack (next);
756	allocate_stack (next, 1);
757	coro_create (&(next->stack->cctx),
758	continue_coro, (void *)next,
759	next->stack->sptr, labs (next->stack->ssize));
760	}
761
762	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
763	prev->cursp = stacklevel;
764	/* don't add any code here */
765	}
766	else
767	next->cursp = stacklevel;
768	}	983	}
769	else if (next->tmps_ix == -2)	984
770	croak ("tried to transfer to running coroutine");	985	prev->flags &= ~CF_RUNNING;
		986	next->flags \|= CF_RUNNING;
		987
		988	LOCK;
		989
		990	if (next->flags & CF_NEW)
		991	{
		992	/* need to start coroutine */
		993	next->flags &= ~CF_NEW;
		994	/* first get rid of the old state */
		995	save_perl (aTHX_ prev);
		996	/* setup coroutine call */
		997	setup_coro (aTHX_ next);
		998	}
771	else	999	else
772	{	1000	{
773	LOCK;	1001	/* coroutine already started */
774	SAVE (prev, -1); /* first get rid of the old state */	1002	save_perl (aTHX_ prev);
775	UNLOCK;	1003	load_perl (aTHX_ next);
776
777	if (flags & TRANSFER_SAVE_CCTXT)
778	{
779	if (!prev->stack)
780	allocate_stack (prev, 0);
781
782	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
783	{
784	PL_top_env = &next->start_env;
785
786	setup_coro (next);
787	next->cursp = stacklevel;
788
789	prev->stack->refcnt++;
790	prev->stack->usecnt++;
791	next->stack = prev->stack;
792	next->gencnt = prev->gencnt;
793	}
794	else
795	{
796	assert (!next->stack);
797	allocate_stack (next, 1);
798	coro_create (&(next->stack->cctx),
799	setup_coro, (void *)next,
800	next->stack->sptr, labs (next->stack->ssize));
801	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
802	prev->cursp = stacklevel;
803	/* don't add any code here */
804	}
805	}
806	else
807	{
808	setup_coro (next);
809	next->cursp = stacklevel;
810	}
811	}	1004	}
812	}
813		1005
814	LOCK;	1006	prev__cctx = prev->cctx;
815	if (coro_mortal)	1007
816	{	1008	/* possibly "free" the cctx */
817	SvREFCNT_dec (coro_mortal);	1009	if (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE))
818	coro_mortal = 0;	1010	{
819	}	1011	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1012	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1013
		1014	prev->cctx = 0;
		1015
		1016	cctx_put (prev__cctx);
		1017	}
		1018
		1019	if (!next->cctx)
		1020	next->cctx = cctx_get (aTHX);
		1021
		1022	if (prev__cctx != next->cctx)
		1023	{
		1024	prev__cctx->top_env = PL_top_env;
		1025	PL_top_env = next->cctx->top_env;
		1026	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1027	}
		1028
		1029	free_coro_mortal (aTHX);
820	UNLOCK;	1030	UNLOCK;
		1031	}
821	}	1032	}
822		1033
823	#define SV_CORO(sv,func) \	1034	struct transfer_args
824	do { \	1035	{
825	if (SvROK (sv)) \	1036	struct coro prev, next;
826	sv = SvRV (sv); \	1037	};
827	\
828	if (SvTYPE (sv) == SVt_PVHV) \
829	{ \
830	HE he = hv_fetch_ent ((HV )sv, ucoro_state_sv, 0, ucoro_state_hash); \
831	\
832	if (!he) \
833	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
834	\
835	(sv) = SvRV (HeVAL(he)); \
836	} \
837	\
838	/* must also be changed inside Coro::Cont::yield */ \
839	if (!SvOBJECT (sv) \|\| SvSTASH (sv) != coro_state_stash) \
840	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
841	\
842	} while(0)
843		1038
844	#define SvSTATE(sv) (struct coro *)SvIV (sv)	1039	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1040	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1041
		1042	/ high level stuff ******************************************************/
		1043
		1044	static int
		1045	coro_state_destroy (pTHX_ struct coro *coro)
		1046	{
		1047	if (coro->flags & CF_DESTROYED)
		1048	return 0;
		1049
		1050	coro->flags \|= CF_DESTROYED;
		1051
		1052	if (coro->flags & CF_READY)
		1053	{
		1054	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1055	/* alternative: look through all ready queues and remove the coro */
		1056	LOCK;
		1057	--coro_nready;
		1058	UNLOCK;
		1059	}
		1060	else
		1061	coro->flags \|= CF_READY; /* make sure it is NOT put into the readyqueue */
		1062
		1063	if (coro->mainstack && coro->mainstack != main_mainstack)
		1064	{
		1065	struct coro temp;
		1066
		1067	assert (!(coro->flags & CF_RUNNING));
		1068
		1069	Zero (&temp, 1, struct coro);
		1070	temp.save = CORO_SAVE_ALL;
		1071
		1072	if (coro->flags & CF_RUNNING)
		1073	croak ("FATAL: tried to destroy currently running coroutine");
		1074
		1075	save_perl (aTHX_ &temp);
		1076	load_perl (aTHX_ coro);
		1077
		1078	coro_destroy_stacks (aTHX);
		1079
		1080	load_perl (aTHX_ &temp); /* this will get rid of defsv etc.. */
		1081
		1082	coro->mainstack = 0;
		1083	}
		1084
		1085	cctx_destroy (coro->cctx);
		1086	SvREFCNT_dec (coro->args);
		1087
		1088	if (coro->next) coro->next->prev = coro->prev;
		1089	if (coro->prev) coro->prev->next = coro->next;
		1090	if (coro == coro_first) coro_first = coro->next;
		1091
		1092	return 1;
		1093	}
		1094
		1095	static int
		1096	coro_state_free (pTHX_ SV sv, MAGIC mg)
		1097	{
		1098	struct coro coro = (struct coro )mg->mg_ptr;
		1099	mg->mg_ptr = 0;
		1100
		1101	coro->hv = 0;
		1102
		1103	if (--coro->refcnt < 0)
		1104	{
		1105	coro_state_destroy (aTHX_ coro);
		1106	Safefree (coro);
		1107	}
		1108
		1109	return 0;
		1110	}
		1111
		1112	static int
		1113	coro_state_dup (pTHX_ MAGIC mg, CLONE_PARAMS params)
		1114	{
		1115	struct coro coro = (struct coro )mg->mg_ptr;
		1116
		1117	++coro->refcnt;
		1118
		1119	return 0;
		1120	}
		1121
		1122	static MGVTBL coro_state_vtbl = {
		1123	0, 0, 0, 0,
		1124	coro_state_free,
		1125	0,
		1126	#ifdef MGf_DUP
		1127	coro_state_dup,
		1128	#else
		1129	# define MGf_DUP 0
		1130	#endif
		1131	};
845		1132
846	static void	1133	static void
		1134	prepare_transfer (pTHX_ struct transfer_args ta, SV prev_sv, SV *next_sv)
		1135	{
		1136	ta->prev = SvSTATE (prev_sv);
		1137	ta->next = SvSTATE (next_sv);
		1138	TRANSFER_CHECK (*ta);
		1139	}
		1140
		1141	static void
847	api_transfer(pTHX_ SV prev, SV next, int flags)	1142	api_transfer (SV prev_sv, SV next_sv)
848	{	1143	{
849	SV_CORO (prev, "Coro::transfer");	1144	dTHX;
850	SV_CORO (next, "Coro::transfer");	1145	struct transfer_args ta;
851		1146
852	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1147	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1148	TRANSFER (ta);
		1149	}
		1150
		1151	static int
		1152	api_save (SV *coro_sv, int new_save)
		1153	{
		1154	dTHX;
		1155	struct coro *coro = SvSTATE (coro_sv);
		1156	int old_save = coro->save;
		1157
		1158	if (new_save >= 0)
		1159	coro->save = new_save;
		1160
		1161	return old_save;
853	}	1162	}
854		1163
855	/ Coro ******************************************************************/	1164	/ Coro ******************************************************************/
856		1165
857	#define PRIO_MAX 3
858	#define PRIO_HIGH 1
859	#define PRIO_NORMAL 0
860	#define PRIO_LOW -1
861	#define PRIO_IDLE -3
862	#define PRIO_MIN -4
863
864	/* for Coro.pm */
865	static GV coro_current, coro_idle;
866	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];
867	static int coro_nready;
868
869	static void	1166	static void
870	coro_enq (pTHX_ SV *sv)	1167	coro_enq (pTHX_ SV *coro_sv)
871	{	1168	{
872	if (SvTYPE (sv) == SVt_PVHV)
873	{
874	SV *xprio = hv_fetch ((HV )sv, "prio", 4, 0);
875	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
876
877	prio = prio > PRIO_MAX ? PRIO_MAX
878	: prio < PRIO_MIN ? PRIO_MIN
879	: prio;
880
881	av_push (coro_ready [prio - PRIO_MIN], sv);	1169	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
882	coro_nready++;
883
884	return;
885	}
886
887	croak ("Coro::ready tried to enqueue something that is not a coroutine");
888	}	1170	}
889		1171
890	static SV *	1172	static SV *
891	coro_deq (pTHX_ int min_prio)	1173	coro_deq (pTHX_ int min_prio)
892	{	1174	{
…		…
895	min_prio -= PRIO_MIN;	1177	min_prio -= PRIO_MIN;
896	if (min_prio < 0)	1178	if (min_prio < 0)
897	min_prio = 0;	1179	min_prio = 0;
898		1180
899	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1181	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
900	if (av_len (coro_ready[prio]) >= 0)	1182	if (AvFILLp (coro_ready [prio]) >= 0)
901	{
902	coro_nready--;
903	return av_shift (coro_ready[prio]);	1183	return av_shift (coro_ready [prio]);
904	}
905		1184
906	return 0;	1185	return 0;
907	}	1186	}
908		1187
		1188	static int
		1189	api_ready (SV *coro_sv)
		1190	{
		1191	dTHX;
		1192	struct coro *coro;
		1193
		1194	if (SvROK (coro_sv))
		1195	coro_sv = SvRV (coro_sv);
		1196
		1197	coro = SvSTATE (coro_sv);
		1198
		1199	if (coro->flags & CF_READY)
		1200	return 0;
		1201
		1202	coro->flags \|= CF_READY;
		1203
		1204	LOCK;
		1205	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1206	++coro_nready;
		1207	UNLOCK;
		1208
		1209	return 1;
		1210	}
		1211
		1212	static int
		1213	api_is_ready (SV *coro_sv)
		1214	{
		1215	dTHX;
		1216	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1217	}
		1218
909	static void	1219	static void
910	api_ready (SV *coro)	1220	prepare_schedule (pTHX_ struct transfer_args *ta)
911	{	1221	{
912	dTHX;	1222	SV prev_sv, next_sv;
913		1223
914	if (SvROK (coro))	1224	for (;;)
915	coro = SvRV (coro);	1225	{
		1226	LOCK;
		1227	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1228
		1229	/* nothing to schedule: call the idle handler */
		1230	if (!next_sv)
		1231	{
		1232	dSP;
		1233	UNLOCK;
		1234
		1235	ENTER;
		1236	SAVETMPS;
		1237
		1238	PUSHMARK (SP);
		1239	PUTBACK;
		1240	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1241
		1242	FREETMPS;
		1243	LEAVE;
		1244	continue;
		1245	}
		1246
		1247	ta->next = SvSTATE (next_sv);
		1248
		1249	/* cannot transfer to destroyed coros, skip and look for next */
		1250	if (ta->next->flags & CF_DESTROYED)
		1251	{
		1252	UNLOCK;
		1253	SvREFCNT_dec (next_sv);
		1254	/* coro_nready is already taken care of by destroy */
		1255	continue;
		1256	}
		1257
		1258	--coro_nready;
		1259	UNLOCK;
		1260	break;
		1261	}
		1262
		1263	/* free this only after the transfer */
		1264	prev_sv = SvRV (coro_current);
		1265	ta->prev = SvSTATE (prev_sv);
		1266	TRANSFER_CHECK (*ta);
		1267	assert (ta->next->flags & CF_READY);
		1268	ta->next->flags &= ~CF_READY;
		1269	SvRV_set (coro_current, next_sv);
916		1270
917	LOCK;	1271	LOCK;
918	coro_enq (aTHX_ SvREFCNT_inc (coro));	1272	free_coro_mortal (aTHX);
		1273	coro_mortal = prev_sv;
919	UNLOCK;	1274	UNLOCK;
		1275	}
		1276
		1277	static void
		1278	prepare_cede (pTHX_ struct transfer_args *ta)
		1279	{
		1280	api_ready (coro_current);
		1281	prepare_schedule (aTHX_ ta);
		1282	}
		1283
		1284	static int
		1285	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1286	{
		1287	if (coro_nready)
		1288	{
		1289	SV *prev = SvRV (coro_current);
		1290	prepare_schedule (aTHX_ ta);
		1291	api_ready (prev);
		1292	return 1;
		1293	}
		1294	else
		1295	return 0;
920	}	1296	}
921		1297
922	static void	1298	static void
923	api_schedule (void)	1299	api_schedule (void)
924	{	1300	{
925	dTHX;	1301	dTHX;
		1302	struct transfer_args ta;
926		1303
927	SV prev, next;	1304	prepare_schedule (aTHX_ &ta);
928		1305	TRANSFER (ta);
929	LOCK;
930
931	prev = SvRV (GvSV (coro_current));
932	next = coro_deq (aTHX_ PRIO_MIN);
933
934	if (!next)
935	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
936
937	/* free this only after the transfer */
938	coro_mortal = prev;
939	SV_CORO (prev, "Coro::schedule");
940
941	SvRV (GvSV (coro_current)) = next;
942
943	SV_CORO (next, "Coro::schedule");
944
945	UNLOCK;
946
947	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
948	TRANSFER_SAVE_ALL \| TRANSFER_LAZY_STACK);
949	}	1306	}
950		1307
951	static void	1308	static int
952	api_cede (void)	1309	api_cede (void)
953	{	1310	{
954	dTHX;	1311	dTHX;
		1312	struct transfer_args ta;
955		1313
956	LOCK;	1314	prepare_cede (aTHX_ &ta);
957	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
958	UNLOCK;
959		1315
960	api_schedule ();	1316	if (ta.prev != ta.next)
		1317	{
		1318	TRANSFER (ta);
		1319	return 1;
		1320	}
		1321	else
		1322	return 0;
		1323	}
		1324
		1325	static int
		1326	api_cede_notself (void)
		1327	{
		1328	dTHX;
		1329	struct transfer_args ta;
		1330
		1331	if (prepare_cede_notself (aTHX_ &ta))
		1332	{
		1333	TRANSFER (ta);
		1334	return 1;
		1335	}
		1336	else
		1337	return 0;
961	}	1338	}
962		1339
963	MODULE = Coro::State PACKAGE = Coro::State	1340	MODULE = Coro::State PACKAGE = Coro::State
964		1341
965	PROTOTYPES: ENABLE	1342	PROTOTYPES: DISABLE
966		1343
967	BOOT:	1344	BOOT:
968	{ /* {} necessary for stoopid perl-5.6.x */	1345	{
969	#ifdef USE_ITHREADS	1346	#ifdef USE_ITHREADS
970	MUTEX_INIT (&coro_mutex);	1347	MUTEX_INIT (&coro_mutex);
971	#endif	1348	#endif
		1349	BOOT_PAGESIZE;
972		1350
973	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
974	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
975	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1351	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
976		1352
		1353	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
		1354	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
		1355	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
		1356	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
		1357
977	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1358	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
978	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1359	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
979	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1360	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1361	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1362	newCONSTSUB (coro_state_stash, "SAVE_DEFFH", newSViv (CORO_SAVE_DEFFH));
980	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1363	newCONSTSUB (coro_state_stash, "SAVE_DEF", newSViv (CORO_SAVE_DEF));
		1364	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
981		1365
982	main_mainstack = PL_mainstack;	1366	main_mainstack = PL_mainstack;
		1367	main_top_env = PL_top_env;
		1368
		1369	while (main_top_env->je_prev)
		1370	main_top_env = main_top_env->je_prev;
983		1371
984	coroapi.ver = CORO_API_VERSION;	1372	coroapi.ver = CORO_API_VERSION;
985	coroapi.transfer = api_transfer;	1373	coroapi.transfer = api_transfer;
986	}
987		1374
988	Coro::State	1375	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
989	_newprocess(args)	1376	}
990	SV * args	1377
991	PROTOTYPE: $	1378	SV *
		1379	new (char *klass, ...)
992	CODE:	1380	CODE:
993	Coro__State coro;	1381	{
		1382	struct coro *coro;
		1383	HV *hv;
		1384	int i;
994		1385
995	if (!SvROK (args) \|\| SvTYPE (SvRV (args)) != SVt_PVAV)
996	croak ("Coro::State::_newprocess expects an arrayref");
997
998	Newz (0, coro, 1, struct coro);	1386	Newz (0, coro, 1, struct coro);
		1387	coro->args = newAV ();
		1388	coro->save = CORO_SAVE_DEF;
		1389	coro->flags = CF_NEW;
999		1390
1000	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1391	if (coro_first) coro_first->prev = coro;
1001	/coro->mainstack = 0; //actual work is done inside transfer /	1392	coro->next = coro_first;
1002	/coro->stack = 0;/	1393	coro_first = coro;
1003		1394
1004	/* same as JMPENV_BOOTSTRAP */	1395	coro->hv = hv = newHV ();
1005	/* we might be able to recycle start_env, but safe is safe */	1396	sv_magicext ((SV )hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char )coro, 0)->mg_flags \|= MGf_DUP;
1006	/Zero(&coro->start_env, 1, JMPENV);/	1397	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1007	coro->start_env.je_ret = -1;
1008	coro->start_env.je_mustcatch = TRUE;
1009		1398
1010	RETVAL = coro;	1399	for (i = 1; i < items; i++)
		1400	av_push (coro->args, newSVsv (ST (i)));
		1401	}
1011	OUTPUT:	1402	OUTPUT:
1012	RETVAL	1403	RETVAL
1013		1404
		1405	int
		1406	save (SV *coro, int new_save = -1)
		1407	CODE:
		1408	RETVAL = api_save (coro, new_save);
		1409	OUTPUT:
		1410	RETVAL
		1411
		1412	int
		1413	save_also (SV *coro_sv, int save_also)
		1414	CODE:
		1415	{
		1416	struct coro *coro = SvSTATE (coro_sv);
		1417	RETVAL = coro->save;
		1418	coro->save \|= save_also;
		1419	}
		1420	OUTPUT:
		1421	RETVAL
		1422
1014	void	1423	void
1015	transfer(prev, next, flags)	1424	_set_stacklevel (...)
1016	SV *prev	1425	ALIAS:
1017	SV *next	1426	Coro::State::transfer = 1
1018	int flags	1427	Coro::schedule = 2
1019	PROTOTYPE: @	1428	Coro::cede = 3
		1429	Coro::cede_notself = 4
1020	CODE:	1430	CODE:
1021	PUTBACK;	1431	{
1022	SV_CORO (next, "Coro::transfer");	1432	struct transfer_args ta;
1023	SV_CORO (prev, "Coro::transfer");	1433
1024	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1434	switch (ix)
1025	SPAGAIN;	1435	{
		1436	case 0:
		1437	ta.prev = (struct coro )INT2PTR (coro_cctx , SvIV (ST (0)));
		1438	ta.next = 0;
		1439	break;
		1440
		1441	case 1:
		1442	if (items != 2)
		1443	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1444
		1445	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1446	break;
		1447
		1448	case 2:
		1449	prepare_schedule (aTHX_ &ta);
		1450	break;
		1451
		1452	case 3:
		1453	prepare_cede (aTHX_ &ta);
		1454	break;
		1455
		1456	case 4:
		1457	if (!prepare_cede_notself (aTHX_ &ta))
		1458	XSRETURN_EMPTY;
		1459
		1460	break;
		1461	}
		1462
		1463	BARRIER;
		1464	TRANSFER (ta);
		1465
		1466	if (GIMME_V != G_VOID && ta.next != ta.prev)
		1467	XSRETURN_YES;
		1468	}
		1469
		1470	bool
		1471	_destroy (SV *coro_sv)
		1472	CODE:
		1473	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1474	OUTPUT:
		1475	RETVAL
1026		1476
1027	void	1477	void
1028	DESTROY(coro)
1029	Coro::State coro
1030	CODE:
1031
1032	if (coro->mainstack && coro->mainstack != main_mainstack)
1033	{
1034	struct coro temp;
1035
1036	PUTBACK;
1037	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
1038	LOAD (aTHX_ coro);
1039	SPAGAIN;
1040
1041	destroy_stacks (aTHX);
1042
1043	LOAD ((&temp)); /* this will get rid of defsv etc.. */
1044	SPAGAIN;
1045
1046	coro->mainstack = 0;
1047	}
1048
1049	deallocate_stack (coro);
1050	SvREFCNT_dec (coro->args);
1051	Safefree (coro);
1052
1053	void
1054	_exit(code)	1478	_exit (code)
1055	int code	1479	int code
1056	PROTOTYPE: $	1480	PROTOTYPE: $
1057	CODE:	1481	CODE:
1058	_exit (code);	1482	_exit (code);
1059		1483
1060	MODULE = Coro::State PACKAGE = Coro::Cont	1484	int
		1485	cctx_stacksize (int new_stacksize = 0)
		1486	CODE:
		1487	RETVAL = coro_stacksize;
		1488	if (new_stacksize)
		1489	coro_stacksize = new_stacksize;
		1490	OUTPUT:
		1491	RETVAL
1061		1492
1062	# this is slightly dirty (should expose a c-level api)	1493	int
		1494	cctx_count ()
		1495	CODE:
		1496	RETVAL = cctx_count;
		1497	OUTPUT:
		1498	RETVAL
		1499
		1500	int
		1501	cctx_idle ()
		1502	CODE:
		1503	RETVAL = cctx_idle;
		1504	OUTPUT:
		1505	RETVAL
1063		1506
1064	void	1507	void
1065	yield(...)	1508	list ()
1066	PROTOTYPE: @	1509	PPCODE:
		1510	{
		1511	struct coro *coro;
		1512	for (coro = coro_first; coro; coro = coro->next)
		1513	if (coro->hv)
		1514	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1515	}
		1516
		1517	void
		1518	call (Coro::State coro, SV *coderef)
		1519	ALIAS:
		1520	eval = 1
		1521	CODE:
		1522	{
		1523	if (coro->mainstack)
		1524	{
		1525	struct coro temp;
		1526	Zero (&temp, 1, struct coro);
		1527	temp.save = CORO_SAVE_ALL;
		1528
		1529	if (!(coro->flags & CF_RUNNING))
		1530	{
		1531	save_perl (aTHX_ &temp);
		1532	load_perl (aTHX_ coro);
		1533	}
		1534
		1535	{
		1536	dSP;
		1537	ENTER;
		1538	SAVETMPS;
		1539	PUSHMARK (SP);
		1540	PUTBACK;
		1541	if (ix)
		1542	eval_sv (coderef, 0);
		1543	else
		1544	call_sv (coderef, G_KEEPERR \| G_EVAL \| G_VOID \| G_DISCARD);
		1545	SPAGAIN;
		1546	FREETMPS;
		1547	LEAVE;
		1548	PUTBACK;
		1549	}
		1550
		1551	if (!(coro->flags & CF_RUNNING))
		1552	{
		1553	save_perl (aTHX_ coro);
		1554	load_perl (aTHX_ &temp);
		1555	}
		1556	}
		1557	}
		1558
		1559	SV *
		1560	is_ready (Coro::State coro)
		1561	PROTOTYPE: $
		1562	ALIAS:
		1563	is_ready = CF_READY
		1564	is_running = CF_RUNNING
		1565	is_new = CF_NEW
		1566	is_destroyed = CF_DESTROYED
		1567	CODE:
		1568	RETVAL = boolSV (coro->flags & ix);
		1569	OUTPUT:
		1570	RETVAL
		1571
		1572	void
		1573	trace (Coro::State coro, int flags = CC_TRACE \| CC_TRACE_SUB)
		1574	CODE:
		1575	if (flags & CC_TRACE)
		1576	{
		1577	if (!coro->cctx)
		1578	coro->cctx = cctx_new ();
		1579	else if (!(coro->cctx->flags & CC_TRACE))
		1580	croak ("cannot enable tracing on coroutine with custom stack");
		1581
		1582	coro->cctx->flags \|= flags & (CC_TRACE \| CC_TRACE_ALL);
		1583	}
		1584	else
		1585	if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1586	{
		1587	coro->cctx->flags &= ~(CC_TRACE \| CC_TRACE_ALL);
		1588	coro->cctx->flags \|= CC_NOREUSE;
		1589
		1590	if (coro->flags & CF_RUNNING)
		1591	PL_runops = RUNOPS_DEFAULT;
		1592	else
		1593	coro->runops = RUNOPS_DEFAULT;
		1594	}
		1595
		1596	SV *
		1597	has_stack (Coro::State coro)
		1598	PROTOTYPE: $
		1599	CODE:
		1600	RETVAL = boolSV (!!coro->cctx);
		1601	OUTPUT:
		1602	RETVAL
		1603
		1604	int
		1605	is_traced (Coro::State coro)
		1606	PROTOTYPE: $
		1607	CODE:
		1608	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1609	OUTPUT:
		1610	RETVAL
		1611
		1612	IV
		1613	rss (Coro::State coro)
		1614	PROTOTYPE: $
1067	CODE:	1615	CODE:
1068	SV *yieldstack;	1616	RETVAL = coro_rss (aTHX_ coro);
1069	SV *sv;	1617	OUTPUT:
1070	AV *defav = GvAV (PL_defgv);	1618	RETVAL
1071	struct coro prev, next;
1072		1619
1073	yieldstack = *hv_fetch (
1074	(HV *)SvRV (GvSV (coro_current)),
1075	"yieldstack", sizeof ("yieldstack") - 1,
1076	0
1077	);
1078
1079	/* set up @_ -- ugly */
1080	av_clear (defav);
1081	av_fill (defav, items - 1);
1082	while (items--)
1083	av_store (defav, items, SvREFCNT_inc (ST(items)));
1084
1085	sv = av_pop ((AV *)SvRV (yieldstack));
1086	prev = (struct coro )SvIV ((SV)SvRV (av_fetch ((AV )SvRV (sv), 0, 0)));
1087	next = (struct coro )SvIV ((SV)SvRV (av_fetch ((AV )SvRV (sv), 1, 0)));
1088	SvREFCNT_dec (sv);
1089
1090	transfer (aTHX_ prev, next, 0);
1091		1620
1092	MODULE = Coro::State PACKAGE = Coro	1621	MODULE = Coro::State PACKAGE = Coro
1093		1622
1094	# this is slightly dirty (should expose a c-level api)
1095
1096	BOOT:	1623	BOOT:
1097	{	1624	{
1098	int i;	1625	int i;
		1626
		1627	sv_pool_rss = get_sv ("Coro::POOL_RSS" , TRUE);
		1628	sv_pool_size = get_sv ("Coro::POOL_SIZE" , TRUE);
		1629	av_async_pool = get_av ("Coro::async_pool", TRUE);
		1630
		1631	coro_current = get_sv ("Coro::current", FALSE);
		1632	SvREADONLY_on (coro_current);
		1633
1099	HV *stash = gv_stashpv ("Coro", TRUE);	1634	coro_stash = gv_stashpv ("Coro", TRUE);
1100		1635
1101	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1636	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1102	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1637	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1103	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1638	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1104	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1639	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1105	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1640	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1106	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1641	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1107
1108	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1109	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1110		1642
1111	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1643	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1112	coro_ready[i] = newAV ();	1644	coro_ready[i] = newAV ();
1113		1645
1114	{	1646	{
1115	SV *sv = perl_get_sv("Coro::API", 1);	1647	SV *sv = perl_get_sv("Coro::API", 1);
1116		1648
1117	coroapi.schedule = api_schedule;	1649	coroapi.schedule = api_schedule;
		1650	coroapi.save = api_save;
1118	coroapi.cede = api_cede;	1651	coroapi.cede = api_cede;
		1652	coroapi.cede_notself = api_cede_notself;
1119	coroapi.ready = api_ready;	1653	coroapi.ready = api_ready;
		1654	coroapi.is_ready = api_is_ready;
1120	coroapi.nready = &coro_nready;	1655	coroapi.nready = &coro_nready;
1121	coroapi.current = coro_current;	1656	coroapi.current = coro_current;
1122		1657
1123	GCoroAPI = &coroapi;	1658	GCoroAPI = &coroapi;
1124	sv_setiv(sv, (IV)&coroapi);	1659	sv_setiv (sv, (IV)&coroapi);
1125	SvREADONLY_on(sv);	1660	SvREADONLY_on (sv);
1126	}	1661	}
1127	}	1662	}
1128		1663
1129	#if !PERL_MICRO
1130
1131	void	1664	void
1132	ready(self)	1665	_set_current (SV *current)
1133	SV * self
1134	PROTOTYPE: $	1666	PROTOTYPE: $
1135	CODE:	1667	CODE:
1136	api_ready (self);	1668	SvREFCNT_dec (SvRV (coro_current));
1137		1669	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1138	#endif
1139		1670
1140	int	1671	int
		1672	prio (Coro::State coro, int newprio = 0)
		1673	ALIAS:
		1674	nice = 1
		1675	CODE:
		1676	{
		1677	RETVAL = coro->prio;
		1678
		1679	if (items > 1)
		1680	{
		1681	if (ix)
		1682	newprio = coro->prio - newprio;
		1683
		1684	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1685	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1686
		1687	coro->prio = newprio;
		1688	}
		1689	}
		1690	OUTPUT:
		1691	RETVAL
		1692
		1693	SV *
		1694	ready (SV *self)
		1695	PROTOTYPE: $
		1696	CODE:
		1697	RETVAL = boolSV (api_ready (self));
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
1141	nready(...)	1702	nready (...)
1142	PROTOTYPE:	1703	PROTOTYPE:
1143	CODE:	1704	CODE:
1144	RETVAL = coro_nready;	1705	RETVAL = coro_nready;
1145	OUTPUT:	1706	OUTPUT:
1146	RETVAL	1707	RETVAL
1147		1708
		1709	# for async_pool speedup
1148	void	1710	void
1149	schedule(...)	1711	_pool_1 (SV *cb)
1150	PROTOTYPE:
1151	CODE:	1712	CODE:
1152	api_schedule ();	1713	{
		1714	int i, len;
		1715	HV hv = (HV )SvRV (coro_current);
		1716	AV *defav = GvAV (PL_defgv);
		1717	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1718	AV *invoke_av;
		1719
		1720	if (!invoke)
		1721	croak ("\3terminate\2\n");
		1722
		1723	hv_store (hv, "desc", sizeof ("desc") - 1,
		1724	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1725
		1726	invoke_av = (AV *)SvRV (invoke);
		1727	len = av_len (invoke_av);
		1728
		1729	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1730
		1731	if (len > 0)
		1732	{
		1733	av_fill (defav, len - 1);
		1734	for (i = 0; i < len; ++i)
		1735	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1736	}
		1737
		1738	SvREFCNT_dec (invoke);
		1739	}
1153		1740
1154	void	1741	void
1155	cede(...)	1742	_pool_2 (SV *cb)
1156	PROTOTYPE:
1157	CODE:	1743	CODE:
1158	api_cede ();	1744	{
		1745	struct coro *coro = SvSTATE (coro_current);
1159		1746
1160	# and these are hacks	1747	sv_setsv (cb, &PL_sv_undef);
		1748
		1749	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1750	\|\| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1751	croak ("\3terminate\2\n");
		1752
		1753	av_clear (GvAV (PL_defgv));
		1754	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1755	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1756	coro->save = CORO_SAVE_DEF;
		1757	coro->prio = 0;
		1758	av_push (av_async_pool, newSVsv (coro_current));
		1759	}
		1760
		1761
		1762	MODULE = Coro::State PACKAGE = Coro::AIO
		1763
1161	SV *	1764	SV *
1162	_aio_get_state ()	1765	_get_state ()
1163	CODE:	1766	CODE:
1164	{	1767	{
1165	struct {	1768	struct io_state *data;
1166	int errorno;
1167	int laststype;
1168	int laststatval;
1169	Stat_t statcache;
1170	} data;
1171		1769
		1770	RETVAL = newSV (sizeof (struct io_state));
		1771	data = (struct io_state *)SvPVX (RETVAL);
		1772	SvCUR_set (RETVAL, sizeof (struct io_state));
		1773	SvPOK_only (RETVAL);
		1774
1172	data.errorno = errno;	1775	data->errorno = errno;
1173	data.laststype = PL_laststype;	1776	data->laststype = PL_laststype;
1174	data.laststatval = PL_laststatval;	1777	data->laststatval = PL_laststatval;
1175	data.statcache = PL_statcache;	1778	data->statcache = PL_statcache;
1176
1177	RETVAL = newSVpvn ((char *)&data, sizeof data);
1178	}	1779	}
1179	OUTPUT:	1780	OUTPUT:
1180	RETVAL	1781	RETVAL
1181		1782
1182	void	1783	void
1183	_aio_set_state (char *data_)	1784	_set_state (char *data_)
1184	PROTOTYPE: $	1785	PROTOTYPE: $
1185	CODE:	1786	CODE:
1186	{	1787	{
1187	struct {	1788	struct io_state data = (void )data_;
1188	int errorno;
1189	int laststype;
1190	int laststatval;
1191	Stat_t statcache;
1192	} data = (void )data_;
1193		1789
1194	errno = data->errorno;	1790	errno = data->errorno;
1195	PL_laststype = data->laststype;	1791	PL_laststype = data->laststype;
1196	PL_laststatval = data->laststatval;	1792	PL_laststatval = data->laststatval;
1197	PL_statcache = data->statcache;	1793	PL_statcache = data->statcache;
1198	}	1794	}
		1795

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Comparing Coro/Coro/State.xs (file contents): Revision 1.72 by root, Wed Feb 1 23:59:41 2006 UTC vs. Revision 1.171 by root, Sat Sep 29 19:42:10 2007 UTC

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Comparing Coro/Coro/State.xs (file contents):
Revision 1.72 by root, Wed Feb 1 23:59:41 2006 UTC vs.
Revision 1.171 by root, Sat Sep 29 19:42:10 2007 UTC