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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.75 by root, Thu Oct 26 06:50:20 2006 UTC vs.
Revision 1.119 by root, Sat Dec 2 15:41:28 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	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
14	# endif	25	# endif
15	# ifndef call_sv	26	# ifndef call_sv
16	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
29	# endif	40	# endif
30	#endif	41	#endif
31		42
		43	#include <stdio.h>
32	#include <errno.h>	44	#include <errno.h>
33	#include <signal.h>	45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
34		53
35	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
36	# include <unistd.h>	55	# include <unistd.h>
37	# include <sys/mman.h>	56	# include <sys/mman.h>
38	# ifndef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
…		…
40	# define MAP_ANONYMOUS MAP_ANON	59	# define MAP_ANONYMOUS MAP_ANON
41	# else	60	# else
42	# undef HAVE_MMAP	61	# undef HAVE_MMAP
43	# endif	62	# endif
44	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
45	#endif	71	# endif
46		72	#else
47	#define SUB_INIT "Coro::State::initialize"	73	# define PAGESIZE 0
48	#define UCORO_STATE "_coro_state"	74	# define BOOT_PAGESIZE (void)0
		75	#endif
49		76
50	/* The next macro should declare a variable stacklevel that contains and approximation	77	/* The next macro should declare a variable stacklevel that contains and approximation
51	* to the current C stack pointer. Its property is that it changes with each call	78	* to the current C stack pointer. Its property is that it changes with each call
52	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
53	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
54		82
55	#define IN_DESTRUCT (PL_main_cv == Nullcv)	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
56		84
57	#define labs(l) ((l) >= 0 ? (l) : -(l))	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
58		92
59	#include "CoroAPI.h"	93	#include "CoroAPI.h"
		94
		95	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
60		96
61	#ifdef USE_ITHREADS	97	#ifdef USE_ITHREADS
62	static perl_mutex coro_mutex;	98	static perl_mutex coro_mutex;
63	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	99	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
64	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	100	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
…		…
67	# define UNLOCK (void)0	103	# define UNLOCK (void)0
68	#endif	104	#endif
69		105
70	static struct CoroAPI coroapi;	106	static struct CoroAPI coroapi;
71	static AV *main_mainstack; /* used to differentiate between $main and others */	107	static AV *main_mainstack; /* used to differentiate between $main and others */
72	static HV *coro_state_stash;	108	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 */	109	static SV *coro_mortal; /* will be freed after next transfer */
76		110
77	/* this is actually not only the c stack but also c registers etc... */	111	static struct coro_cctx *cctx_first;
		112	static int cctx_count, cctx_idle;
		113
		114	/* this is a structure representing a c-level coroutine */
78	typedef struct {	115	typedef struct coro_cctx {
79	int refcnt; /* pointer reference counter */	116	struct coro_cctx *next;
80	int usecnt; /* shared by how many coroutines */
81	int gencnt; /* generation counter */
82		117
83	coro_context cctx;	118	/* the stack */
84
85	void *sptr;	119	void *sptr;
86	long ssize; /* positive == mmap, otherwise malloc */	120	long ssize; /* positive == mmap, otherwise malloc */
87	} coro_stack;
88		121
		122	/* cpu state */
		123	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		124	JMPENV *top_env;
		125	coro_context cctx;
		126
		127	int inuse;
		128
		129	#if USE_VALGRIND
		130	int valgrind_id;
		131	#endif
		132	} coro_cctx;
		133
		134	enum {
		135	CF_RUNNING = 0x0001, /* coroutine is running */
		136	CF_READY = 0x0002, /* coroutine is ready */
		137	CF_NEW = 0x0004, /* ahs never been switched to */
		138	};
		139
		140	/* this is a structure representing a perl-level coroutine */
89	struct coro {	141	struct coro {
90	/* the top-level JMPENV for each coroutine, needed to catch dies. */	142	/* the c coroutine allocated to this perl coroutine, if any */
91	JMPENV start_env;	143	coro_cctx *cctx;
92		144
93	/* the optional C context */	145	/* data associated with this coroutine (initial args) */
94	coro_stack *stack;	146	AV *args;
95	void *cursp;
96	int gencnt;	147	int refcnt;
		148	int flags;
97		149
98	/* optionally saved, might be zero */	150	/* optionally saved, might be zero */
99	AV *defav;	151	AV *defav;
100	SV *defsv;	152	SV *defsv;
101	SV *errsv;	153	SV *errsv;
102		154
103	/* saved global state not related to stacks */	155	#define VAR(name,type) type name;
104	U8 dowarn;	156	# include "state.h"
105	I32 in_eval;	157	#undef VAR
106		158
107	/* the stacks and related info (callchain etc..) */	159	/* coro process data */
108	PERL_SI *curstackinfo;	160	int prio;
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
138	/* data associated with this coroutine (initial args) */
139	AV *args;
140	};	161	};
141		162
142	typedef struct coro *Coro__State;	163	typedef struct coro *Coro__State;
143	typedef struct coro *Coro__State_or_hashref;	164	typedef struct coro *Coro__State_or_hashref;
144		165
145	/* mostly copied from op.c:cv_clone2 */	166	static AV *
146	STATIC AV *	167	coro_clone_padlist (CV *cv)
147	clone_padlist (pTHX_ AV *protopadlist)
148	{	168	{
149	AV *av;	169	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;	170	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		171
168	newpadlist = newAV ();	172	newpadlist = newAV ();
169	AvREAL_off (newpadlist);	173	AvREAL_off (newpadlist);
170	av_store (newpadlist, 0, (SV *) newpad_name);	174	#if PERL_VERSION_ATLEAST (5,9,0)
		175	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		176	#else
		177	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		178	#endif
		179	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		180	--AvFILLp (padlist);
		181
		182	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
171	av_store (newpadlist, 1, (SV *) newpad);	183	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		184
242	return newpadlist;	185	return newpadlist;
243	}	186	}
244		187
245	STATIC void	188	static void
246	free_padlist (pTHX_ AV *padlist)	189	free_padlist (AV *padlist)
247	{	190	{
248	/* may be during global destruction */	191	/* may be during global destruction */
249	if (SvREFCNT (padlist))	192	if (SvREFCNT (padlist))
250	{	193	{
251	I32 i = AvFILLp (padlist);	194	I32 i = AvFILLp (padlist);
…		…
264		207
265	SvREFCNT_dec ((SV*)padlist);	208	SvREFCNT_dec ((SV*)padlist);
266	}	209	}
267	}	210	}
268		211
269	STATIC int	212	static int
270	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)	213	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
271	{	214	{
272	AV *padlist;	215	AV *padlist;
273	AV *av = (AV *)mg->mg_obj;	216	AV *av = (AV *)mg->mg_obj;
274		217
275	/* casting is fun. */	218	/* casting is fun. */
276	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	219	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
277	free_padlist (aTHX_ padlist);	220	free_padlist (padlist);
278		221
279	SvREFCNT_dec (av);	222	SvREFCNT_dec (av);
		223
		224	return 0;
280	}	225	}
281		226
282	#define PERL_MAGIC_coro PERL_MAGIC_ext	227	#define PERL_MAGIC_coro PERL_MAGIC_ext
283		228
284	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	229	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
285		230
		231	#define CORO_MAGIC(cv) \
		232	SvMAGIC (cv) \
		233	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		234	? SvMAGIC (cv) \
		235	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		236	: 0
		237
286	/* the next two functions merely cache the padlists */	238	/* the next two functions merely cache the padlists */
287	STATIC void	239	static void
288	get_padlist (pTHX_ CV *cv)	240	get_padlist (CV *cv)
289	{	241	{
290	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	242	MAGIC *mg = CORO_MAGIC (cv);
		243	AV *av;
291		244
292	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	245	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
293	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	246	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
294	else	247	else
		248	{
		249	#if 0
		250	/* this is probably cleaner, but also slower? */
		251	CV *cp = Perl_cv_clone (cv);
		252	CvPADLIST (cv) = CvPADLIST (cp);
		253	CvPADLIST (cp) = 0;
		254	SvREFCNT_dec (cp);
		255	#else
295	CvPADLIST (cv) = clone_padlist (aTHX_ CvPADLIST (cv));	256	CvPADLIST (cv) = coro_clone_padlist (cv);
		257	#endif
		258	}
296	}	259	}
297		260
298	STATIC void	261	static void
299	put_padlist (pTHX_ CV *cv)	262	put_padlist (CV *cv)
300	{	263	{
301	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
302		266
303	if (!mg)	267	if (!mg)
304	{	268	{
305	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	269	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
306	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	270	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
307	mg->mg_virtual = &vtbl_coro;	271	mg->mg_virtual = &vtbl_coro;
308	mg->mg_obj = (SV *)newAV ();	272	mg->mg_obj = (SV *)newAV ();
309	}	273	}
310		274
311	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	275	av = (AV *)mg->mg_obj;
		276
		277	if (AvFILLp (av) >= AvMAX (av))
		278	av_extend (av, AvMAX (av) + 1);
		279
		280	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
312	}	281	}
313		282
314	#define SB do {	283	#define SB do {
315	#define SE } while (0)	284	#define SE } while (0)
316		285
317	#define LOAD(state) load_state(aTHX_ (state));	286	#define LOAD(state) load_state ((state))
318	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	287	#define SAVE(state,flags) save_state ((state),(flags))
319		288
320	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
321		290
322	static void	291	static void
323	load_state(pTHX_ Coro__State c)	292	load_state (Coro__State c)
324	{	293	{
325	PL_dowarn = c->dowarn;	294	#define VAR(name,type) PL_ ## name = c->name;
326	PL_in_eval = c->in_eval;	295	# include "state.h"
327		296	#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		297
360	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	298	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
361	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	299	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
362	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	300	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
363		301
…		…
366	CV *cv;	304	CV *cv;
367		305
368	/* now do the ugly restore mess */	306	/* now do the ugly restore mess */
369	while ((cv = (CV *)POPs))	307	while ((cv = (CV *)POPs))
370	{	308	{
371	AV *padlist = (AV *)POPs;
372
373	if (padlist)
374	{
375	put_padlist (aTHX_ cv); /* mark this padlist as available */	309	put_padlist (cv); /* mark this padlist as available */
376	CvPADLIST(cv) = padlist;	310	CvDEPTH (cv) = PTR2IV (POPs);
377	}	311	CvPADLIST (cv) = (AV *)POPs;
378
379	++CvDEPTH(cv);
380	}	312	}
381		313
382	PUTBACK;	314	PUTBACK;
383	}	315	}
384	}	316	}
385		317
386	static void	318	static void
387	save_state(pTHX_ Coro__State c, int flags)	319	save_state (Coro__State c, int flags)
388	{	320	{
389	{	321	{
390	dSP;	322	dSP;
391	I32 cxix = cxstack_ix;	323	I32 cxix = cxstack_ix;
392	PERL_CONTEXT *ccstk = cxstack;	324	PERL_CONTEXT *ccstk = cxstack;
…		…
403	{	335	{
404	while (cxix >= 0)	336	while (cxix >= 0)
405	{	337	{
406	PERL_CONTEXT *cx = &ccstk[cxix--];	338	PERL_CONTEXT *cx = &ccstk[cxix--];
407		339
408	if (CxTYPE(cx) == CXt_SUB)	340	if (CxTYPE (cx) == CXt_SUB)
409	{	341	{
410	CV *cv = cx->blk_sub.cv;	342	CV *cv = cx->blk_sub.cv;
		343
411	if (CvDEPTH(cv))	344	if (CvDEPTH (cv))
412	{	345	{
413	EXTEND (SP, CvDEPTH(cv)*2);	346	EXTEND (SP, 3);
414		347
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));	348	PUSHs ((SV *)CvPADLIST (cv));
		349	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
423	PUSHs ((SV *)cv);	350	PUSHs ((SV *)cv);
424		351
425	get_padlist (aTHX_ cv); /* this is a monster */	352	CvDEPTH (cv) = 0;
		353	get_padlist (cv);
426	}	354	}
427	}	355	}
428	#ifdef CXt_FORMAT	356	#ifdef CXt_FORMAT
429	else if (CxTYPE(cx) == CXt_FORMAT)	357	else if (CxTYPE (cx) == CXt_FORMAT)
430	{	358	{
431	/* I never used formats, so how should I know how these are implemented? */	359	/* I never used formats, so how should I know how these are implemented? */
432	/* my bold guess is as a simple, plain sub... */	360	/* my bold guess is as a simple, plain sub... */
433	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	361	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
434	}	362	}
…		…
448		376
449	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	377	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
450	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	378	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
451	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	379	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
452		380
453	c->dowarn = PL_dowarn;	381	#define VAR(name,type)c->name = PL_ ## name;
454	c->in_eval = PL_in_eval;	382	# include "state.h"
455		383	#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	}	384	}
488		385
489	/*	386	/*
490	* allocate various perl stacks. This is an exact copy	387	* allocate various perl stacks. This is an exact copy
491	* of perl.c:init_stacks, except that it uses less memory	388	* of perl.c:init_stacks, except that it uses less memory
492	* on the (sometimes correct) assumption that coroutines do	389	* on the (sometimes correct) assumption that coroutines do
493	* not usually need a lot of stackspace.	390	* not usually need a lot of stackspace.
494	*/	391	*/
495	STATIC void	392	static void
496	coro_init_stacks (pTHX)	393	coro_init_stacks ()
497	{	394	{
498	LOCK;
499
500	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	395	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
501	PL_curstackinfo->si_type = PERLSI_MAIN;	396	PL_curstackinfo->si_type = PERLSI_MAIN;
502	PL_curstack = PL_curstackinfo->si_stack;	397	PL_curstack = PL_curstackinfo->si_stack;
503	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	398	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
504		399
505	PL_stack_base = AvARRAY(PL_curstack);	400	PL_stack_base = AvARRAY(PL_curstack);
506	PL_stack_sp = PL_stack_base;	401	PL_stack_sp = PL_stack_base;
507	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	402	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
508		403
509	New(50,PL_tmps_stack,96,SV*);	404	New(50,PL_tmps_stack,128,SV*);
510	PL_tmps_floor = -1;	405	PL_tmps_floor = -1;
511	PL_tmps_ix = -1;	406	PL_tmps_ix = -1;
512	PL_tmps_max = 96;	407	PL_tmps_max = 128;
513		408
514	New(54,PL_markstack,16,I32);	409	New(54,PL_markstack,32,I32);
515	PL_markstack_ptr = PL_markstack;	410	PL_markstack_ptr = PL_markstack;
516	PL_markstack_max = PL_markstack + 16;	411	PL_markstack_max = PL_markstack + 32;
517		412
518	#ifdef SET_MARK_OFFSET	413	#ifdef SET_MARK_OFFSET
519	SET_MARK_OFFSET;	414	SET_MARK_OFFSET;
520	#endif	415	#endif
521		416
522	New(54,PL_scopestack,16,I32);	417	New(54,PL_scopestack,32,I32);
523	PL_scopestack_ix = 0;	418	PL_scopestack_ix = 0;
524	PL_scopestack_max = 16;	419	PL_scopestack_max = 32;
525		420
526	New(54,PL_savestack,96,ANY);	421	New(54,PL_savestack,64,ANY);
527	PL_savestack_ix = 0;	422	PL_savestack_ix = 0;
528	PL_savestack_max = 96;	423	PL_savestack_max = 64;
529		424
530	#if PERL_VERSION < 9	425	#if !PERL_VERSION_ATLEAST (5,9,0)
531	New(54,PL_retstack,8,OP*);	426	New(54,PL_retstack,16,OP*);
532	PL_retstack_ix = 0;	427	PL_retstack_ix = 0;
533	PL_retstack_max = 8;	428	PL_retstack_max = 16;
534	#endif	429	#endif
535
536	UNLOCK;
537	}	430	}
538		431
539	/*	432	/*
540	* destroy the stacks, the callchain etc...	433	* destroy the stacks, the callchain etc...
541	*/	434	*/
542	STATIC void	435	static void
543	destroy_stacks(pTHX)	436	coro_destroy_stacks ()
544	{	437	{
545	if (!IN_DESTRUCT)	438	if (!IN_DESTRUCT)
546	{	439	{
547	/* is this ugly, I ask? */	440	/* is this ugly, I ask? */
548	LEAVE_SCOPE (0);	441	LEAVE_SCOPE (0);
…		…
579		472
580	Safefree (PL_tmps_stack);	473	Safefree (PL_tmps_stack);
581	Safefree (PL_markstack);	474	Safefree (PL_markstack);
582	Safefree (PL_scopestack);	475	Safefree (PL_scopestack);
583	Safefree (PL_savestack);	476	Safefree (PL_savestack);
584	#if PERL_VERSION < 9	477	#if !PERL_VERSION_ATLEAST (5,9,0)
585	Safefree (PL_retstack);	478	Safefree (PL_retstack);
586	#endif	479	#endif
587	}	480	}
588		481
589	static void	482	static void
590	allocate_stack (Coro__State ctx, int alloc)	483	setup_coro (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	{	484	{
647	/*	485	/*
648	* emulate part of the perl startup here.	486	* emulate part of the perl startup here.
649	*/	487	*/
650	dTHX;
651	dSP;
652	Coro__State ctx = (Coro__State)arg;
653	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
654		488
655	coro_init_stacks (aTHX);	489	coro_init_stacks ();
656	/*PL_curcop = 0;*/	490
657	/*PL_in_eval = PL_in_eval;*/ /* inherit */	491	PL_curcop = &PL_compiling;
		492	PL_in_eval = EVAL_NULL;
		493	PL_curpm = 0;
		494	PL_localizing = 0;
		495	PL_dirty = 0;
		496	PL_restartop = 0;
		497
		498	{
		499	dSP;
		500	LOGOP myop;
		501
		502	/* I have no idea why this is needed, but it is */
		503	PUSHMARK (SP);
		504
658	SvREFCNT_dec (GvAV (PL_defgv));	505	SvREFCNT_dec (GvAV (PL_defgv));
659	GvAV (PL_defgv) = ctx->args; ctx->args = 0;	506	GvAV (PL_defgv) = coro->args; coro->args = 0;
660		507
661	SPAGAIN;
662
663	if (ctx->stack)
664	{
665	ctx->cursp = 0;
666
667	PUSHMARK(SP);
668	PUTBACK;
669	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
670
671	if (SvTRUE (ERRSV))
672	croak (NULL);
673	else
674	croak ("FATAL: CCTXT coroutine returned!");
675	}
676	else
677	{
678	UNOP myop;
679
680	PL_op = (OP *)&myop;
681
682	Zero(&myop, 1, UNOP);	508	Zero (&myop, 1, LOGOP);
683	myop.op_next = Nullop;	509	myop.op_next = Nullop;
684	myop.op_flags = OPf_WANT_VOID;	510	myop.op_flags = OPf_WANT_VOID;
685		511
		512	PL_op = (OP *)&myop;
		513
686	PUSHMARK(SP);	514	PUSHMARK (SP);
687	XPUSHs (sub_init);	515	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
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;	516	PUTBACK;
696	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	517	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
697	SPAGAIN;	518	SPAGAIN;
		519	}
698		520
699	ENTER; /* necessary e.g. for dounwind */	521	ENTER; /* necessary e.g. for dounwind */
700	}
701	}	522	}
702		523
703	static void	524	static void
704	continue_coro (void *arg)	525	free_coro_mortal ()
705	{	526	{
706	/*
707	* this is a _very_ stripped down perl interpreter ;)
708	*/
709	dTHX;
710	Coro__State ctx = (Coro__State)arg;
711	JMPENV coro_start_env;
712
713	PL_top_env = &ctx->start_env;
714
715	ctx->cursp = 0;
716	PL_op = PL_op->op_next;
717	CALLRUNOPS(aTHX);
718
719	abort ();
720	}
721
722	STATIC void
723	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)
724	{
725	dSTACKLEVEL;
726
727	if (prev != next)
728	{
729	if (next->mainstack)
730	{
731	LOCK;
732	SAVE (prev, flags);
733	LOAD (next);
734	UNLOCK;
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	}
769	else if (next->tmps_ix == -2)
770	croak ("tried to transfer to running coroutine");
771	else
772	{
773	LOCK;
774	SAVE (prev, -1); /* first get rid of the old state */
775	UNLOCK;
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	}
812	}
813
814	LOCK;
815	if (coro_mortal)	527	if (coro_mortal)
816	{	528	{
817	SvREFCNT_dec (coro_mortal);	529	SvREFCNT_dec (coro_mortal);
818	coro_mortal = 0;	530	coro_mortal = 0;
819	}	531	}
		532	}
		533
		534	static void NOINLINE
		535	prepare_cctx (coro_cctx *cctx)
		536	{
		537	dSP;
		538	LOGOP myop;
		539
		540	Zero (&myop, 1, LOGOP);
		541	myop.op_next = PL_op;
		542	myop.op_flags = OPf_WANT_VOID;
		543
		544	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		545
		546	PUSHMARK (SP);
		547	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		548	PUTBACK;
		549	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
		550	SPAGAIN;
		551	}
		552
		553	static void
		554	coro_run (void *arg)
		555	{
		556	/* coro_run is the alternative epilogue of transfer() */
820	UNLOCK;	557	UNLOCK;
821	}
822		558
823	#define SV_CORO(sv,func) \	559	/*
824	do { \	560	* this is a _very_ stripped down perl interpreter ;)
825	if (SvROK (sv)) \	561	*/
826	sv = SvRV (sv); \	562	PL_top_env = &PL_start_env;
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		563
844	#define SvSTATE(sv) INT2PTR (struct coro *, SvIV (sv))	564	/* inject call to cctx_init */
		565	prepare_cctx ((coro_cctx *)arg);
845		566
		567	/* somebody will hit me for both perl_run and PL_restartop */
		568	perl_run (PL_curinterp);
		569
		570	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		571	abort ();
		572	}
		573
		574	static coro_cctx *
		575	cctx_new ()
		576	{
		577	coro_cctx *cctx;
		578
		579	++cctx_count;
		580
		581	New (0, cctx, 1, coro_cctx);
		582
		583	#if HAVE_MMAP
		584
		585	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		586	/* mmap suppsedly does allocate-on-write for us */
		587	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		588
		589	if (cctx->sptr == (void *)-1)
		590	{
		591	perror ("FATAL: unable to mmap stack for coroutine");
		592	_exit (EXIT_FAILURE);
		593	}
		594
		595	# if STACKGUARD
		596	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		597	# endif
		598
		599	#else
		600
		601	cctx->ssize = STACKSIZE * (long)sizeof (long);
		602	New (0, cctx->sptr, STACKSIZE, long);
		603
		604	if (!cctx->sptr)
		605	{
		606	perror ("FATAL: unable to malloc stack for coroutine");
		607	_exit (EXIT_FAILURE);
		608	}
		609
		610	#endif
		611
		612	#if USE_VALGRIND
		613	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		614	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		615	cctx->ssize + (char *)cctx->sptr
		616	);
		617	#endif
		618
		619	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		620
		621	return cctx;
		622	}
		623
		624	static void
		625	cctx_destroy (coro_cctx *cctx)
		626	{
		627	if (!cctx)
		628	return;
		629
		630	--cctx_count;
		631
		632	#if USE_VALGRIND
		633	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		634	#endif
		635
		636	#if HAVE_MMAP
		637	munmap (cctx->sptr, cctx->ssize);
		638	#else
		639	Safefree (cctx->sptr);
		640	#endif
		641
		642	Safefree (cctx);
		643	}
		644
		645	static coro_cctx *
		646	cctx_get ()
		647	{
		648	coro_cctx *cctx;
		649
		650	if (cctx_first)
		651	{
		652	cctx = cctx_first;
		653	cctx_first = cctx->next;
		654	--cctx_idle;
		655	}
		656	else
		657	{
		658	cctx = cctx_new ();
		659	PL_op = PL_op->op_next;
		660	}
		661
		662	return cctx;
		663	}
		664
		665	static void
		666	cctx_put (coro_cctx *cctx)
		667	{
		668	/* free another cctx if overlimit */
		669	if (cctx_idle >= MAX_IDLE_CCTX)
		670	{
		671	coro_cctx *first = cctx_first;
		672	cctx_first = first->next;
		673	--cctx_idle;
		674
		675	assert (!first->inuse);
		676	cctx_destroy (first);
		677	}
		678
		679	++cctx_idle;
		680	cctx->next = cctx_first;
		681	cctx_first = cctx;
		682	}
		683
		684	/* never call directly, always through the coro_state_transfer global variable */
		685	static void NOINLINE
		686	transfer (struct coro *prev, struct coro *next, int flags)
		687	{
		688	dSTACKLEVEL;
		689
		690	/* sometimes transfer is only called to set idle_sp */
		691	if (flags == TRANSFER_SET_STACKLEVEL)
		692	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		693	else if (prev != next)
		694	{
		695	coro_cctx *prev__cctx;
		696
		697	if (prev->flags & CF_NEW)
		698	{
		699	/* create a new empty context */
		700	Newz (0, prev->cctx, 1, coro_cctx);
		701	prev->cctx->inuse = 1;
		702	prev->flags &= ~CF_NEW;
		703	prev->flags |= CF_RUNNING;
		704	}
		705
		706	/*TODO: must not croak here */
		707	if (!prev->flags & CF_RUNNING)
		708	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		709
		710	if (next->flags & CF_RUNNING)
		711	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		712
		713	prev->flags &= ~CF_RUNNING;
		714	next->flags |= CF_RUNNING;
		715
		716	LOCK;
		717
		718	if (next->flags & CF_NEW)
		719	{
		720	/* need to start coroutine */
		721	next->flags &= ~CF_NEW;
		722	/* first get rid of the old state */
		723	SAVE (prev, -1);
		724	/* setup coroutine call */
		725	setup_coro (next);
		726	/* need a new stack */
		727	assert (!next->stack);
		728	}
		729	else
		730	{
		731	/* coroutine already started */
		732	SAVE (prev, flags);
		733	LOAD (next);
		734	}
		735
		736	prev__cctx = prev->cctx;
		737
		738	/* possibly "free" the cctx */
		739	if (prev__cctx->idle_sp == STACKLEVEL)
		740	{
		741	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		742	assert (PL_top_env == prev__cctx->top_env);
		743
		744	prev->cctx = 0;
		745
		746	cctx_put (prev__cctx);
		747	prev__cctx->inuse = 0;
		748	}
		749
		750	if (!next->cctx)
		751	{
		752	next->cctx = cctx_get ();
		753	assert (!next->cctx->inuse);
		754	next->cctx->inuse = 1;
		755	}
		756
		757	if (prev__cctx != next->cctx)
		758	{
		759	prev__cctx->top_env = PL_top_env;
		760	PL_top_env = next->cctx->top_env;
		761	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		762	}
		763
		764	free_coro_mortal ();
		765
		766	UNLOCK;
		767	}
		768	}
		769
		770	struct transfer_args
		771	{
		772	struct coro *prev, *next;
		773	int flags;
		774	};
		775
		776	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		777
		778	static void
		779	coro_state_destroy (struct coro *coro)
		780	{
		781	if (coro->refcnt--)
		782	return;
		783
		784	if (coro->mainstack && coro->mainstack != main_mainstack)
		785	{
		786	struct coro temp;
		787
		788	if (coro->flags & CF_RUNNING)
		789	croak ("FATAL: tried to destroy currently running coroutine");
		790
		791	SAVE ((&temp), TRANSFER_SAVE_ALL);
		792	LOAD (coro);
		793
		794	coro_destroy_stacks ();
		795
		796	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		797
		798	coro->mainstack = 0;
		799	}
		800
		801	cctx_destroy (coro->cctx);
		802	SvREFCNT_dec (coro->args);
		803	Safefree (coro);
		804	}
		805
846	static void	806	static int
		807	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		808	{
		809	struct coro *coro = (struct coro *)mg->mg_ptr;
		810	mg->mg_ptr = 0;
		811
		812	coro_state_destroy (coro);
		813
		814	return 0;
		815	}
		816
		817	static int
		818	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		819	{
		820	struct coro *coro = (struct coro *)mg->mg_ptr;
		821
		822	++coro->refcnt;
		823
		824	return 0;
		825	}
		826
		827	static MGVTBL coro_state_vtbl = {
		828	0, 0, 0, 0,
		829	coro_state_clear,
		830	0,
		831	#ifdef MGf_DUP
		832	coro_state_dup,
		833	#else
		834	# define MGf_DUP 0
		835	#endif
		836	};
		837
		838	static struct coro *
		839	SvSTATE (SV *coro)
		840	{
		841	HV *stash;
		842	MAGIC *mg;
		843
		844	if (SvROK (coro))
		845	coro = SvRV (coro);
		846
		847	stash = SvSTASH (coro);
		848	if (stash != coro_stash && stash != coro_state_stash)
		849	{
		850	/* very slow, but rare, check */
		851	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		852	croak ("Coro::State object required");
		853	}
		854
		855	mg = SvMAGIC (coro);
		856	assert (mg->mg_type == PERL_MAGIC_ext);
		857	return (struct coro *)mg->mg_ptr;
		858	}
		859
		860	static void
		861	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		862	{
		863	ta->prev = SvSTATE (prev);
		864	ta->next = SvSTATE (next);
		865	ta->flags = flags;
		866	}
		867
		868	static void
847	api_transfer(pTHX_ SV *prev, SV *next, int flags)	869	api_transfer (SV *prev, SV *next, int flags)
848	{	870	{
849	SV_CORO (prev, "Coro::transfer");	871	struct transfer_args ta;
850	SV_CORO (next, "Coro::transfer");
851		872
852	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	873	prepare_transfer (&ta, prev, next, flags);
		874	TRANSFER (ta);
853	}	875	}
854		876
855	/** Coro ********************************************************************/	877	/** Coro ********************************************************************/
856		878
857	#define PRIO_MAX 3	879	#define PRIO_MAX 3
…		…
860	#define PRIO_LOW -1	882	#define PRIO_LOW -1
861	#define PRIO_IDLE -3	883	#define PRIO_IDLE -3
862	#define PRIO_MIN -4	884	#define PRIO_MIN -4
863		885
864	/* for Coro.pm */	886	/* for Coro.pm */
865	static GV *coro_current, *coro_idle;	887	static SV *coro_current;
866	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	888	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
867	static int coro_nready;	889	static int coro_nready;
868		890
869	static void	891	static void
870	coro_enq (pTHX_ SV *sv)	892	coro_enq (SV *coro_sv)
871	{	893	{
872	SV **xprio;
873	int prio;
874
875	if (SvTYPE (sv) != SVt_PVHV)
876	croak ("Coro::ready tried to enqueue something that is not a coroutine");
877
878	xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
879	prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
880
881	prio = prio > PRIO_MAX ? PRIO_MAX
882	: prio < PRIO_MIN ? PRIO_MIN
883	: prio;
884
885	av_push (coro_ready [prio - PRIO_MIN], sv);	894	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
886	coro_nready++;	895	coro_nready++;
887	}	896	}
888		897
889	static SV *	898	static SV *
890	coro_deq (pTHX_ int min_prio)	899	coro_deq (int min_prio)
891	{	900	{
892	int prio = PRIO_MAX - PRIO_MIN;	901	int prio = PRIO_MAX - PRIO_MIN;
893		902
894	min_prio -= PRIO_MIN;	903	min_prio -= PRIO_MIN;
895	if (min_prio < 0)	904	if (min_prio < 0)
896	min_prio = 0;	905	min_prio = 0;
897		906
898	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	907	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
899	if (av_len (coro_ready[prio]) >= 0)	908	if (AvFILLp (coro_ready [prio]) >= 0)
900	{	909	{
901	coro_nready--;	910	coro_nready--;
902	return av_shift (coro_ready[prio]);	911	return av_shift (coro_ready [prio]);
903	}	912	}
904		913
905	return 0;	914	return 0;
906	}	915	}
907		916
908	static void	917	static int
909	api_ready (SV *coro)	918	api_ready (SV *coro_sv)
910	{	919	{
911	dTHX;	920	struct coro *coro;
912		921
913	if (SvROK (coro))	922	if (SvROK (coro_sv))
914	coro = SvRV (coro);	923	coro_sv = SvRV (coro_sv);
		924
		925	coro = SvSTATE (coro_sv);
		926
		927	if (coro->flags & CF_READY)
		928	return 0;
		929
		930	#if 0 /* this is actually harmless */
		931	if (coro->flags & CF_RUNNING)
		932	croak ("Coro::ready called on currently running coroutine");
		933	#endif
		934
		935	coro->flags |= CF_READY;
915		936
916	LOCK;	937	LOCK;
917	coro_enq (aTHX_ SvREFCNT_inc (coro));	938	coro_enq (SvREFCNT_inc (coro_sv));
918	UNLOCK;	939	UNLOCK;
		940
		941	return 1;
		942	}
		943
		944	static int
		945	api_is_ready (SV *coro_sv)
		946	{
		947	return !!SvSTATE (coro_sv)->flags & CF_READY;
		948	}
		949
		950	static void
		951	prepare_schedule (struct transfer_args *ta)
		952	{
		953	SV *prev, *next;
		954
		955	for (;;)
		956	{
		957	LOCK;
		958	next = coro_deq (PRIO_MIN);
		959	UNLOCK;
		960
		961	if (next)
		962	break;
		963
		964	{
		965	dSP;
		966
		967	ENTER;
		968	SAVETMPS;
		969
		970	PUSHMARK (SP);
		971	PUTBACK;
		972	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		973
		974	FREETMPS;
		975	LEAVE;
		976	}
		977	}
		978
		979	prev = SvRV (coro_current);
		980	SvRV_set (coro_current, next);
		981
		982	/* free this only after the transfer */
		983	LOCK;
		984	free_coro_mortal ();
		985	UNLOCK;
		986	coro_mortal = prev;
		987
		988	assert (!SvROK(prev));//D
		989	assert (!SvROK(next));//D
		990
		991	ta->prev = SvSTATE (prev);
		992	ta->next = SvSTATE (next);
		993	ta->flags = TRANSFER_SAVE_ALL;
		994
		995	assert (ta->flags & CF_READY);
		996	ta->next->flags &= ~CF_READY;
		997	}
		998
		999	static void
		1000	prepare_cede (struct transfer_args *ta)
		1001	{
		1002	api_ready (coro_current);
		1003
		1004	prepare_schedule (ta);
919	}	1005	}
920		1006
921	static void	1007	static void
922	api_schedule (void)	1008	api_schedule (void)
923	{	1009	{
924	dTHX;	1010	struct transfer_args ta;
925		1011
926	SV *prev, *next;	1012	prepare_schedule (&ta);
927		1013	TRANSFER (ta);
928	LOCK;
929
930	prev = SvRV (GvSV (coro_current));
931	next = coro_deq (aTHX_ PRIO_MIN);
932
933	if (!next)
934	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
935
936	/* free this only after the transfer */
937	coro_mortal = prev;
938	SV_CORO (prev, "Coro::schedule");
939
940	SvRV (GvSV (coro_current)) = next;
941
942	SV_CORO (next, "Coro::schedule");
943
944	UNLOCK;
945
946	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
947	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
948	}	1014	}
949		1015
950	static void	1016	static void
951	api_cede (void)	1017	api_cede (void)
952	{	1018	{
953	dTHX;	1019	struct transfer_args ta;
954		1020
955	LOCK;	1021	prepare_cede (&ta);
956	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1022	TRANSFER (ta);
957	UNLOCK;
958
959	api_schedule ();
960	}	1023	}
961		1024
962	MODULE = Coro::State PACKAGE = Coro::State	1025	MODULE = Coro::State PACKAGE = Coro::State
963		1026
964	PROTOTYPES: ENABLE	1027	PROTOTYPES: DISABLE
965		1028
966	BOOT:	1029	BOOT:
967	{ /* {} necessary for stoopid perl-5.6.x */	1030	{
968	#ifdef USE_ITHREADS	1031	#ifdef USE_ITHREADS
969	MUTEX_INIT (&coro_mutex);	1032	MUTEX_INIT (&coro_mutex);
970	#endif	1033	#endif
		1034	BOOT_PAGESIZE;
971		1035
972	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
973	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
974	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1036	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
975		1037
976	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1038	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
977	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1039	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
978	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1040	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
979	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
980		1041
981	main_mainstack = PL_mainstack;	1042	main_mainstack = PL_mainstack;
982		1043
983	coroapi.ver = CORO_API_VERSION;	1044	coroapi.ver = CORO_API_VERSION;
984	coroapi.transfer = api_transfer;	1045	coroapi.transfer = api_transfer;
985	}
986		1046
987	Coro::State	1047	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
988	_newprocess(args)	1048	}
989	SV * args	1049
990	PROTOTYPE: $	1050	SV *
		1051	new (char *klass, ...)
991	CODE:	1052	CODE:
992	Coro__State coro;	1053	{
		1054	struct coro *coro;
		1055	HV *hv;
		1056	int i;
993		1057
994	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
995	croak ("Coro::State::_newprocess expects an arrayref");
996
997	Newz (0, coro, 1, struct coro);	1058	Newz (0, coro, 1, struct coro);
		1059	coro->args = newAV ();
		1060	coro->flags = CF_NEW;
998		1061
999	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1062	hv = newHV ();
1000	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1063	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1001	/*coro->stack = 0;*/	1064	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1002		1065
1003	/* same as JMPENV_BOOTSTRAP */	1066	for (i = 1; i < items; i++)
1004	/* we might be able to recycle start_env, but safe is safe */	1067	av_push (coro->args, newSVsv (ST (i)));
1005	/*Zero(&coro->start_env, 1, JMPENV);*/	1068	}
1006	coro->start_env.je_ret = -1;
1007	coro->start_env.je_mustcatch = TRUE;
1008
1009	RETVAL = coro;
1010	OUTPUT:	1069	OUTPUT:
1011	RETVAL	1070	RETVAL
1012		1071
1013	void	1072	void
1014	transfer(prev, next, flags)	1073	_set_stacklevel (...)
1015	SV *prev	1074	ALIAS:
1016	SV *next	1075	Coro::State::transfer = 1
1017	int flags	1076	Coro::schedule = 2
1018	PROTOTYPE: @	1077	Coro::cede = 3
1019	CODE:	1078	CODE:
1020	PUTBACK;	1079	{
1021	SV_CORO (next, "Coro::transfer");	1080	struct transfer_args ta;
1022	SV_CORO (prev, "Coro::transfer");	1081
1023	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1082	switch (ix)
1024	SPAGAIN;	1083	{
		1084	case 0:
		1085	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1086	ta.next = 0;
		1087	ta.flags = TRANSFER_SET_STACKLEVEL;
		1088	break;
		1089
		1090	case 1:
		1091	if (items != 3)
		1092	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1093
		1094	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1095	break;
		1096
		1097	case 2:
		1098	prepare_schedule (&ta);
		1099	break;
		1100
		1101	case 3:
		1102	prepare_cede (&ta);
		1103	break;
		1104	}
		1105
		1106	TRANSFER (ta);
		1107	}
1025		1108
1026	void	1109	void
1027	DESTROY(coro)	1110	_clone_state_from (SV *dst, SV *src)
1028	Coro::State coro	1111	CODE:
1029	CODE:	1112	{
		1113	struct coro *coro_src = SvSTATE (src);
1030		1114
1031	if (coro->mainstack && coro->mainstack != main_mainstack)	1115	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1032	{
1033	struct coro temp;
1034		1116
1035	PUTBACK;	1117	++coro_src->refcnt;
1036	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1118	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1037	LOAD (aTHX_ coro);	1119	}
1038	SPAGAIN;
1039
1040	destroy_stacks (aTHX);
1041
1042	LOAD ((&temp)); /* this will get rid of defsv etc.. */
1043	SPAGAIN;
1044
1045	coro->mainstack = 0;
1046	}
1047
1048	deallocate_stack (coro);
1049	SvREFCNT_dec (coro->args);
1050	Safefree (coro);
1051		1120
1052	void	1121	void
1053	_exit(code)	1122	_exit (code)
1054	int code	1123	int code
1055	PROTOTYPE: $	1124	PROTOTYPE: $
1056	CODE:	1125	CODE:
1057	_exit (code);	1126	_exit (code);
1058		1127
1059	MODULE = Coro::State PACKAGE = Coro::Cont	1128	int
		1129	cctx_count ()
		1130	CODE:
		1131	RETVAL = cctx_count;
		1132	OUTPUT:
		1133	RETVAL
1060		1134
1061	# this is slightly dirty (should expose a c-level api)	1135	int
1062		1136	cctx_idle ()
1063	void	1137	CODE:
1064	yield(...)	1138	RETVAL = cctx_idle;
1065	PROTOTYPE: @	1139	OUTPUT:
1066	CODE:	1140	RETVAL
1067	SV *yieldstack;
1068	SV *sv;
1069	AV *defav = GvAV (PL_defgv);
1070	struct coro *prev, *next;
1071
1072	yieldstack = *hv_fetch (
1073	(HV *)SvRV (GvSV (coro_current)),
1074	"yieldstack", sizeof ("yieldstack") - 1,
1075	0
1076	);
1077
1078	/* set up @_ -- ugly */
1079	av_clear (defav);
1080	av_fill (defav, items - 1);
1081	while (items--)
1082	av_store (defav, items, SvREFCNT_inc (ST(items)));
1083
1084	sv = av_pop ((AV *)SvRV (yieldstack));
1085	prev = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0))));
1086	next = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0))));
1087	SvREFCNT_dec (sv);
1088
1089	transfer (aTHX_ prev, next, 0);
1090		1141
1091	MODULE = Coro::State PACKAGE = Coro	1142	MODULE = Coro::State PACKAGE = Coro
1092		1143
1093	# this is slightly dirty (should expose a c-level api)
1094
1095	BOOT:	1144	BOOT:
1096	{	1145	{
1097	int i;	1146	int i;
		1147
1098	HV *stash = gv_stashpv ("Coro", TRUE);	1148	coro_stash = gv_stashpv ("Coro", TRUE);
1099		1149
1100	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1150	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1101	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1151	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1102	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1152	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1103	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1153	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1104	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1154	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1105	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1155	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1106		1156
1107	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1157	coro_current = get_sv ("Coro::current", FALSE);
1108	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1158	SvREADONLY_on (coro_current);
1109		1159
1110	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1160	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1111	coro_ready[i] = newAV ();	1161	coro_ready[i] = newAV ();
1112		1162
1113	{	1163	{
1114	SV *sv = perl_get_sv("Coro::API", 1);	1164	SV *sv = perl_get_sv("Coro::API", 1);
1115		1165
1116	coroapi.schedule = api_schedule;	1166	coroapi.schedule = api_schedule;
1117	coroapi.cede = api_cede;	1167	coroapi.cede = api_cede;
1118	coroapi.ready = api_ready;	1168	coroapi.ready = api_ready;
		1169	coroapi.is_ready = api_is_ready;
1119	coroapi.nready = &coro_nready;	1170	coroapi.nready = &coro_nready;
1120	coroapi.current = coro_current;	1171	coroapi.current = coro_current;
1121		1172
1122	GCoroAPI = &coroapi;	1173	GCoroAPI = &coroapi;
1123	sv_setiv(sv, (IV)&coroapi);	1174	sv_setiv (sv, (IV)&coroapi);
1124	SvREADONLY_on(sv);	1175	SvREADONLY_on (sv);
1125	}	1176	}
1126	}	1177	}
1127		1178
1128	#if !PERL_MICRO	1179	int
		1180	prio (Coro::State coro, int newprio = 0)
		1181	ALIAS:
		1182	nice = 1
		1183	CODE:
		1184	{
		1185	RETVAL = coro->prio;
1129		1186
1130	void	1187	if (items > 1)
		1188	{
		1189	if (ix)
		1190	newprio += coro->prio;
		1191
		1192	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1193	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1194
		1195	coro->prio = newprio;
		1196	}
		1197	}
		1198
		1199	SV *
1131	ready(self)	1200	ready (SV *self)
1132	SV * self
1133	PROTOTYPE: $	1201	PROTOTYPE: $
1134	CODE:	1202	CODE:
1135	api_ready (self);	1203	RETVAL = boolSV (api_ready (self));
		1204	OUTPUT:
		1205	RETVAL
1136		1206
1137	#endif	1207	SV *
		1208	is_ready (SV *self)
		1209	PROTOTYPE: $
		1210	CODE:
		1211	RETVAL = boolSV (api_is_ready (self));
		1212	OUTPUT:
		1213	RETVAL
1138		1214
1139	int	1215	int
1140	nready(...)	1216	nready (...)
1141	PROTOTYPE:	1217	PROTOTYPE:
1142	CODE:	1218	CODE:
1143	RETVAL = coro_nready;	1219	RETVAL = coro_nready;
1144	OUTPUT:	1220	OUTPUT:
1145	RETVAL	1221	RETVAL
1146		1222
1147	void	1223	void
1148	schedule(...)	1224	_set_current (SV *current)
1149	PROTOTYPE:	1225	PROTOTYPE: $
1150	CODE:	1226	CODE:
1151	api_schedule ();	1227	SvREFCNT_dec (SvRV (coro_current));
		1228	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1152		1229
1153	void	1230	MODULE = Coro::State PACKAGE = Coro::AIO
1154	cede(...)
1155	PROTOTYPE:
1156	CODE:
1157	api_cede ();
1158		1231
1159	# and these are hacks
1160	SV *	1232	SV *
1161	_aio_get_state ()	1233	_get_state ()
1162	CODE:	1234	CODE:
1163	{	1235	{
1164	struct {	1236	struct {
1165	int errorno;	1237	int errorno;
1166	int laststype;	1238	int laststype;
…		…
1177	}	1249	}
1178	OUTPUT:	1250	OUTPUT:
1179	RETVAL	1251	RETVAL
1180		1252
1181	void	1253	void
1182	_aio_set_state (char *data_)	1254	_set_state (char *data_)
1183	PROTOTYPE: $	1255	PROTOTYPE: $
1184	CODE:	1256	CODE:
1185	{	1257	{
1186	struct {	1258	struct {
1187	int errorno;	1259	int errorno;

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