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Comparing Coro/Coro/State.xs (file contents):
Revision 1.13 by root, Mon Jul 23 22:09:39 2001 UTC vs.
Revision 1.108 by root, Mon Nov 27 18:15:47 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	#define PERL_VERSION_ATLEAST(a,b,c) \
		14	(PERL_REVISION > (a) \
		15	|| (PERL_REVISION == (a) \
		16	&& (PERL_VERSION > (b) \
		17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		18
		19	#if !PERL_VERSION_ATLEAST (5,6,0)
		20	# ifndef PL_ppaddr
		21	# define PL_ppaddr ppaddr
		22	# endif
		23	# ifndef call_sv
		24	# define call_sv perl_call_sv
		25	# endif
		26	# ifndef get_sv
		27	# define get_sv perl_get_sv
		28	# endif
		29	# ifndef get_cv
		30	# define get_cv perl_get_cv
		31	# endif
		32	# ifndef IS_PADGV
		33	# define IS_PADGV(v) 0
		34	# endif
		35	# ifndef IS_PADCONST
		36	# define IS_PADCONST(v) 0
		37	# endif
		38	#endif
		39
		40	#include <stdio.h>
		41	#include <errno.h>
		42
		43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		44	# undef STACKGUARD
		45	#endif
		46
		47	#ifndef STACKGUARD
		48	# define STACKGUARD 0
		49	#endif
6		50
7	#ifdef HAVE_MMAP	51	#ifdef HAVE_MMAP
8	# include <unistd.h>	52	# include <unistd.h>
9	# include <sys/mman.h>	53	# include <sys/mman.h>
		54	# ifndef MAP_ANONYMOUS
		55	# ifdef MAP_ANON
		56	# define MAP_ANONYMOUS MAP_ANON
		57	# else
		58	# undef HAVE_MMAP
		59	# endif
10	#endif	60	# endif
		61	# include <limits.h>
		62	# ifndef PAGESIZE
		63	# define PAGESIZE pagesize
		64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		65	static long pagesize;
		66	# else
		67	# define BOOT_PAGESIZE (void)0
		68	# endif
		69	#else
		70	# define PAGESIZE 0
		71	# define BOOT_PAGESIZE (void)0
		72	#endif
11		73
12	#define MAY_FLUSH /* increases codesize */	74	/* The next macro should declare a variable stacklevel that contains and approximation
		75	* to the current C stack pointer. Its property is that it changes with each call
		76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
		78	#define STACKLEVEL ((void *)&stacklevel)
13		79
14	#define SUB_INIT "Coro::State::initialize"	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
15		81
16	#define TRANSFER_SAVE_DEFAV 0x00000001	82	#if __GNUC__ >= 3
17	#define TRANSFER_SAVE_DEFSV 0x00000002	83	# define attribute(x) __attribute__(x)
18	#define TRANSFER_SAVE_ERRSV 0x00000004	84	#else
19	#define TRANSFER_SAVE_CCTXT 0x00000008	85	# define attribute(x)
		86	#endif
20		87
21	#define TRANSFER_SAVE_ALL -1	88	#define NOINLINE attribute ((noinline))
22		89
		90	#include "CoroAPI.h"
		91
		92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		93
		94	#ifdef USE_ITHREADS
		95	static perl_mutex coro_mutex;
		96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		98	#else
		99	# define LOCK (void)0
		100	# define UNLOCK (void)0
		101	#endif
		102
		103	static struct CoroAPI coroapi;
		104	static AV *main_mainstack; /* used to differentiate between $main and others */
		105	static HV *coro_state_stash, *coro_stash;
		106	static SV *coro_mortal; /* will be freed after next transfer */
		107
		108	static struct coro_cctx *cctx_first;
		109	static int cctx_count, cctx_idle;
		110
		111	/* this is a structure representing a c-level coroutine */
		112	typedef struct coro_cctx {
		113	struct coro_cctx *next;
		114
		115	/* the stack */
		116	void *sptr;
		117	long ssize; /* positive == mmap, otherwise malloc */
		118
		119	/* cpu state */
		120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		121	JMPENV *top_env;
		122	coro_context cctx;
		123
		124	#if USE_VALGRIND
		125	int valgrind_id;
		126	#endif
		127	} coro_cctx;
		128
		129	/* this is a structure representing a perl-level coroutine */
23	struct coro {	130	struct coro {
24	/* the optional C context */	131	/* the c coroutine allocated to this perl coroutine, if any */
25	coro_context cctx;	132	coro_cctx *cctx;
26	void *sptr;	133
27	long ssize;	134	/* data associated with this coroutine (initial args) */
		135	AV *args;
		136	int refcnt;
28		137
29	/* optionally saved, might be zero */	138	/* optionally saved, might be zero */
30	AV *defav;	139	AV *defav;
31	SV *defsv;	140	SV *defsv;
32	SV *errsv;	141	SV *errsv;
33		142
34	/* saved global state not related to stacks */	143	#define VAR(name,type) type name;
35	U8 dowarn;	144	# include "state.h"
		145	#undef VAR
36		146
37	/* the stacks and related info (callchain etc..) */	147	/* coro process data */
38	PERL_SI *curstackinfo;	148	int prio;
39	AV *curstack;
40	AV *mainstack;
41	SV **stack_sp;
42	OP *op;
43	SV **curpad;
44	SV **stack_base;
45	SV **stack_max;
46	SV **tmps_stack;
47	I32 tmps_floor;
48	I32 tmps_ix;
49	I32 tmps_max;
50	I32 *markstack;
51	I32 *markstack_ptr;
52	I32 *markstack_max;
53	I32 *scopestack;
54	I32 scopestack_ix;
55	I32 scopestack_max;
56	ANY *savestack;
57	I32 savestack_ix;
58	I32 savestack_max;
59	OP **retstack;
60	I32 retstack_ix;
61	I32 retstack_max;
62	COP *curcop;
63	JMPENV start_env;
64	JMPENV *top_env;
65
66	/* data associated with this coroutine (initial args) */
67	AV *args;
68	};	149	};
69		150
70	typedef struct coro *Coro__State;	151	typedef struct coro *Coro__State;
71	typedef struct coro *Coro__State_or_hashref;	152	typedef struct coro *Coro__State_or_hashref;
72		153
73	static AV *main_mainstack; /* used to differentiate between $main and others */	154	static AV *
74	static HV *coro_state_stash;	155	coro_clone_padlist (CV *cv)
75	static HV *padlist_cache;
76
77	/* mostly copied from op.c:cv_clone2 */
78	STATIC AV *
79	clone_padlist (AV *protopadlist)
80	{	156	{
81	AV *av;	157	AV *padlist = CvPADLIST (cv);
82	I32 ix;
83	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
84	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
85	SV **pname = AvARRAY (protopad_name);
86	SV **ppad = AvARRAY (protopad);
87	I32 fname = AvFILLp (protopad_name);
88	I32 fpad = AvFILLp (protopad);
89	AV *newpadlist, *newpad_name, *newpad;	158	AV *newpadlist, *newpad;
90	SV **npad;
91
92	newpad_name = newAV ();
93	for (ix = fname; ix >= 0; ix--)
94	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
95
96	newpad = newAV ();
97	av_fill (newpad, AvFILLp (protopad));
98	npad = AvARRAY (newpad);
99		159
100	newpadlist = newAV ();	160	newpadlist = newAV ();
101	AvREAL_off (newpadlist);	161	AvREAL_off (newpadlist);
102	av_store (newpadlist, 0, (SV *) newpad_name);	162	#if PERL_VERSION_ATLEAST (5,9,0)
		163	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		164	#else
		165	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		166	#endif
		167	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		168	--AvFILLp (padlist);
		169
		170	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
103	av_store (newpadlist, 1, (SV *) newpad);	171	av_store (newpadlist, 1, (SV *)newpad);
104		172
105	av = newAV (); /* will be @_ */	173	return newpadlist;
106	av_extend (av, 0);	174	}
107	av_store (newpad, 0, (SV *) av);
108	AvFLAGS (av) = AVf_REIFY;
109		175
110	for (ix = fpad; ix > 0; ix--)	176	static void
		177	free_padlist (AV *padlist)
		178	{
		179	/* may be during global destruction */
		180	if (SvREFCNT (padlist))
111	{	181	{
112	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	182	I32 i = AvFILLp (padlist);
113	if (namesv && namesv != &PL_sv_undef)	183	while (i >= 0)
114	{	184	{
115	char *name = SvPVX (namesv); /* XXX */	185	SV **svp = av_fetch (padlist, i--, FALSE);
116	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	186	if (svp)
117	{ /* lexical from outside? */
118	npad[ix] = SvREFCNT_inc (ppad[ix]);
119	}	187	{
120	else
121	{ /* our own lexical */
122	SV *sv;	188	SV *sv;
123	if (*name == '&')	189	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
124	sv = SvREFCNT_inc (ppad[ix]);	190	SvREFCNT_dec (sv);
125	else if (*name == '@')	191
126	sv = (SV *) newAV ();	192	SvREFCNT_dec (*svp);
127	else if (*name == '%')
128	sv = (SV *) newHV ();
129	else
130	sv = NEWSV (0, 0);
131	if (!SvPADBUSY (sv))
132	SvPADMY_on (sv);
133	npad[ix] = sv;
134	}	193	}
135	}	194	}
136	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	195
137	{	196	SvREFCNT_dec ((SV*)padlist);
138	npad[ix] = SvREFCNT_inc (ppad[ix]);
139	}
140	else
141	{
142	SV *sv = NEWSV (0, 0);
143	SvPADTMP_on (sv);
144	npad[ix] = sv;
145	}
146	}	197	}
		198	}
147		199
148	#if 0 /* return -ENOTUNDERSTOOD */	200	static int
149	/* Now that vars are all in place, clone nested closures. */	201	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		202	{
		203	AV *padlist;
		204	AV *av = (AV *)mg->mg_obj;
150		205
151	for (ix = fpad; ix > 0; ix--) {	206	/* casting is fun. */
152	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	207	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
153	if (namesv	208	free_padlist (padlist);
154	&& namesv != &PL_sv_undef	209
155	&& !(SvFLAGS(namesv) & SVf_FAKE)	210	SvREFCNT_dec (av);
156	&& *SvPVX(namesv) == '&'	211
157	&& CvCLONE(ppad[ix]))	212	return 0;
158	{	213	}
159	CV *kid = cv_clone((CV*)ppad[ix]);	214
160	SvREFCNT_dec(ppad[ix]);	215	#define PERL_MAGIC_coro PERL_MAGIC_ext
161	CvCLONE_on(kid);	216
162	SvPADMY_on(kid);	217	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
163	npad[ix] = (SV*)kid;	218
164	}	219	/* the next two functions merely cache the padlists */
		220	static void
		221	get_padlist (CV *cv)
		222	{
		223	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		224
		225	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
		226	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
		227	else
		228	{
		229	#if 0
		230	/* this is probably cleaner, but also slower? */
		231	CV *cp = Perl_cv_clone (cv);
		232	CvPADLIST (cv) = CvPADLIST (cp);
		233	CvPADLIST (cp) = 0;
		234	SvREFCNT_dec (cp);
		235	#else
		236	CvPADLIST (cv) = coro_clone_padlist (cv);
		237	#endif
		238	}
		239	}
		240
		241	static void
		242	put_padlist (CV *cv)
		243	{
		244	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		245
		246	if (!mg)
		247	{
		248	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		249	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		250	mg->mg_virtual = &vtbl_coro;
		251	mg->mg_obj = (SV *)newAV ();
165	}	252	}
166	#endif
167		253
168	return newpadlist;
169	}
170
171	#ifdef MAY_FLUSH
172	STATIC AV *
173	free_padlist (AV *padlist)
174	{
175	/* may be during global destruction */
176	if (SvREFCNT(padlist))
177	{
178	I32 i = AvFILLp(padlist);
179	while (i >= 0)
180	{
181	SV **svp = av_fetch(padlist, i--, FALSE);
182	SV *sv = svp ? *svp : Nullsv;
183	if (sv)
184	SvREFCNT_dec(sv);
185	}
186
187	SvREFCNT_dec((SV*)padlist);
188	}
189	}
190	#endif
191
192	/* the next two functions merely cache the padlists */
193	STATIC void
194	get_padlist (CV *cv)
195	{
196	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
197
198	if (he && AvFILLp ((AV *)*he) >= 0)
199	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
200	else
201	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
202	}
203
204	STATIC void
205	put_padlist (CV *cv)
206	{
207	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
208
209	if (SvTYPE (*he) != SVt_PVAV)
210	{
211	SvREFCNT_dec (*he);
212	*he = (SV *)newAV ();
213	}
214
215	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	254	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
216	}	255	}
217
218	#ifdef MAY_FLUSH
219	STATIC void
220	flush_padlist_cache ()
221	{
222	HV *hv = padlist_cache;
223	padlist_cache = newHV ();
224
225	if (hv_iterinit (hv))
226	{
227	HE *he;
228	AV *padlist;
229
230	while (!!(he = hv_iternext (hv)))
231	{
232	AV *av = (AV *)HeVAL(he);
233
234	/* casting is fun. */
235	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
236	free_padlist (padlist);
237	}
238	}
239
240	SvREFCNT_dec (hv);
241	}
242	#endif
243		256
244	#define SB do {	257	#define SB do {
245	#define SE } while (0)	258	#define SE } while (0)
246		259
247	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	260	#define LOAD(state) load_state((state));
248	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	261	#define SAVE(state,flags) save_state((state),(flags));
249		262
250	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	263	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
251		264
252	static void	265	static void
253	load_state(pTHX_ Coro__State c)	266	load_state(Coro__State c)
254	{	267	{
255	PL_dowarn = c->dowarn;	268	#define VAR(name,type) PL_ ## name = c->name;
256		269	# include "state.h"
257	PL_curstackinfo = c->curstackinfo;	270	#undef VAR
258	PL_curstack = c->curstack;
259	PL_mainstack = c->mainstack;
260	PL_stack_sp = c->stack_sp;
261	PL_op = c->op;
262	PL_curpad = c->curpad;
263	PL_stack_base = c->stack_base;
264	PL_stack_max = c->stack_max;
265	PL_tmps_stack = c->tmps_stack;
266	PL_tmps_floor = c->tmps_floor;
267	PL_tmps_ix = c->tmps_ix;
268	PL_tmps_max = c->tmps_max;
269	PL_markstack = c->markstack;
270	PL_markstack_ptr = c->markstack_ptr;
271	PL_markstack_max = c->markstack_max;
272	PL_scopestack = c->scopestack;
273	PL_scopestack_ix = c->scopestack_ix;
274	PL_scopestack_max = c->scopestack_max;
275	PL_savestack = c->savestack;
276	PL_savestack_ix = c->savestack_ix;
277	PL_savestack_max = c->savestack_max;
278	PL_retstack = c->retstack;
279	PL_retstack_ix = c->retstack_ix;
280	PL_retstack_max = c->retstack_max;
281	PL_curcop = c->curcop;
282	PL_start_env = c->start_env;
283	PL_top_env = c->top_env;
284		271
285	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	272	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
286	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	273	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
287	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	274	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
288		275
…		…
297		284
298	if (padlist)	285	if (padlist)
299	{	286	{
300	put_padlist (cv); /* mark this padlist as available */	287	put_padlist (cv); /* mark this padlist as available */
301	CvPADLIST(cv) = padlist;	288	CvPADLIST(cv) = padlist;
302	#ifdef USE_THREADS
303	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
304	#endif
305	}	289	}
306		290
307	++CvDEPTH(cv);	291	++CvDEPTH(cv);
308	}	292	}
309		293
310	PUTBACK;	294	PUTBACK;
311	}	295	}
312	}	296	}
313		297
314	static void	298	static void
315	save_state(pTHX_ Coro__State c, int flags)	299	save_state(Coro__State c, int flags)
316	{	300	{
317	{	301	{
318	dSP;	302	dSP;
319	I32 cxix = cxstack_ix;	303	I32 cxix = cxstack_ix;
320	PERL_CONTEXT *ccstk = cxstack;	304	PERL_CONTEXT *ccstk = cxstack;
…		…
327		311
328	PUSHs (Nullsv);	312	PUSHs (Nullsv);
329	/* this loop was inspired by pp_caller */	313	/* this loop was inspired by pp_caller */
330	for (;;)	314	for (;;)
331	{	315	{
332	do	316	while (cxix >= 0)
333	{	317	{
334	PERL_CONTEXT *cx = &ccstk[cxix--];	318	PERL_CONTEXT *cx = &ccstk[cxix--];
335		319
336	if (CxTYPE(cx) == CXt_SUB)	320	if (CxTYPE(cx) == CXt_SUB)
337	{	321	{
338	CV *cv = cx->blk_sub.cv;	322	CV *cv = cx->blk_sub.cv;
339	if (CvDEPTH(cv))	323	if (CvDEPTH(cv))
340	{	324	{
341	#ifdef USE_THREADS
342	/*XPUSHs ((SV *)CvOWNER(cv));*/
343	/*CvOWNER(cv) = 0;*/
344	/*error must unlock this cv etc.. etc...*/
345	#endif
346	EXTEND (SP, CvDEPTH(cv)*2);	325	EXTEND (SP, CvDEPTH(cv)*2);
347		326
348	while (--CvDEPTH(cv))	327	while (--CvDEPTH(cv))
349	{	328	{
350	/* this tells the restore code to increment CvDEPTH */	329	/* this tells the restore code to increment CvDEPTH */
…		…
353	}	332	}
354		333
355	PUSHs ((SV *)CvPADLIST(cv));	334	PUSHs ((SV *)CvPADLIST(cv));
356	PUSHs ((SV *)cv);	335	PUSHs ((SV *)cv);
357		336
358	get_padlist (cv); /* this is a monster */	337	get_padlist (cv);
359	}	338	}
360	}	339	}
		340	#ifdef CXt_FORMAT
361	else if (CxTYPE(cx) == CXt_FORMAT)	341	else if (CxTYPE(cx) == CXt_FORMAT)
362	{	342	{
363	/* I never used formats, so how should I know how these are implemented? */	343	/* I never used formats, so how should I know how these are implemented? */
364	/* my bold guess is as a simple, plain sub... */	344	/* my bold guess is as a simple, plain sub... */
365	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	345	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
366	}	346	}
		347	#endif
367	}	348	}
368	while (cxix >= 0);
369		349
370	if (top_si->si_type == PERLSI_MAIN)	350	if (top_si->si_type == PERLSI_MAIN)
371	break;	351	break;
372		352
373	top_si = top_si->si_prev;	353	top_si = top_si->si_prev;
…		…
380		360
381	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	361	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
382	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	362	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
383	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	363	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
384		364
385	/* I have not the slightest idea of why av_reify is necessary */	365	#define VAR(name,type)c->name = PL_ ## name;
386	/* but if it's missing the defav contents magically get replaced sometimes */	366	# include "state.h"
387	if (c->defav)	367	#undef VAR
388	av_reify (c->defav);
389
390	c->dowarn = PL_dowarn;
391
392	c->curstackinfo = PL_curstackinfo;
393	c->curstack = PL_curstack;
394	c->mainstack = PL_mainstack;
395	c->stack_sp = PL_stack_sp;
396	c->op = PL_op;
397	c->curpad = PL_curpad;
398	c->stack_base = PL_stack_base;
399	c->stack_max = PL_stack_max;
400	c->tmps_stack = PL_tmps_stack;
401	c->tmps_floor = PL_tmps_floor;
402	c->tmps_ix = PL_tmps_ix;
403	c->tmps_max = PL_tmps_max;
404	c->markstack = PL_markstack;
405	c->markstack_ptr = PL_markstack_ptr;
406	c->markstack_max = PL_markstack_max;
407	c->scopestack = PL_scopestack;
408	c->scopestack_ix = PL_scopestack_ix;
409	c->scopestack_max = PL_scopestack_max;
410	c->savestack = PL_savestack;
411	c->savestack_ix = PL_savestack_ix;
412	c->savestack_max = PL_savestack_max;
413	c->retstack = PL_retstack;
414	c->retstack_ix = PL_retstack_ix;
415	c->retstack_max = PL_retstack_max;
416	c->curcop = PL_curcop;
417	c->start_env = PL_start_env;
418	c->top_env = PL_top_env;
419	}	368	}
420		369
421	/*	370	/*
422	* allocate various perl stacks. This is an exact copy	371	* allocate various perl stacks. This is an exact copy
423	* of perl.c:init_stacks, except that it uses less memory	372	* of perl.c:init_stacks, except that it uses less memory
424	* on the assumption that coroutines do not usually need	373	* on the (sometimes correct) assumption that coroutines do
425	* a lot of stackspace.	374	* not usually need a lot of stackspace.
426	*/	375	*/
427	STATIC void	376	static void
428	coro_init_stacks (pTHX)	377	coro_init_stacks ()
429	{	378	{
430	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	379	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
431	PL_curstackinfo->si_type = PERLSI_MAIN;	380	PL_curstackinfo->si_type = PERLSI_MAIN;
432	PL_curstack = PL_curstackinfo->si_stack;	381	PL_curstack = PL_curstackinfo->si_stack;
433	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	382	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
434		383
435	PL_stack_base = AvARRAY(PL_curstack);	384	PL_stack_base = AvARRAY(PL_curstack);
436	PL_stack_sp = PL_stack_base;	385	PL_stack_sp = PL_stack_base;
437	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	386	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
438		387
439	New(50,PL_tmps_stack,64,SV*);	388	New(50,PL_tmps_stack,96,SV*);
440	PL_tmps_floor = -1;	389	PL_tmps_floor = -1;
441	PL_tmps_ix = -1;	390	PL_tmps_ix = -1;
442	PL_tmps_max = 64;	391	PL_tmps_max = 96;
443		392
444	New(54,PL_markstack,12,I32);	393	New(54,PL_markstack,16,I32);
445	PL_markstack_ptr = PL_markstack;	394	PL_markstack_ptr = PL_markstack;
446	PL_markstack_max = PL_markstack + 12;	395	PL_markstack_max = PL_markstack + 16;
447		396
		397	#ifdef SET_MARK_OFFSET
448	SET_MARK_OFFSET;	398	SET_MARK_OFFSET;
		399	#endif
449		400
450	New(54,PL_scopestack,12,I32);	401	New(54,PL_scopestack,16,I32);
451	PL_scopestack_ix = 0;	402	PL_scopestack_ix = 0;
452	PL_scopestack_max = 12;	403	PL_scopestack_max = 16;
453		404
454	New(54,PL_savestack,64,ANY);	405	New(54,PL_savestack,96,ANY);
455	PL_savestack_ix = 0;	406	PL_savestack_ix = 0;
456	PL_savestack_max = 64;	407	PL_savestack_max = 96;
457		408
		409	#if !PERL_VERSION_ATLEAST (5,9,0)
458	New(54,PL_retstack,8,OP*);	410	New(54,PL_retstack,8,OP*);
459	PL_retstack_ix = 0;	411	PL_retstack_ix = 0;
460	PL_retstack_max = 8;	412	PL_retstack_max = 8;
		413	#endif
461	}	414	}
462		415
463	/*	416	/*
464	* destroy the stacks, the callchain etc...	417	* destroy the stacks, the callchain etc...
465	* still there is a memleak of 128 bytes...
466	*/	418	*/
467	STATIC void	419	static void
468	destroy_stacks(pTHX)	420	coro_destroy_stacks ()
469	{	421	{
		422	if (!IN_DESTRUCT)
		423	{
470	/* is this ugly, I ask? */	424	/* is this ugly, I ask? */
471	while (PL_scopestack_ix)	425	LEAVE_SCOPE (0);
472	LEAVE;
473		426
474	/* sure it is, but more important: is it correct?? :/ */	427	/* sure it is, but more important: is it correct?? :/ */
475	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
476	FREETMPS;	428	FREETMPS;
		429
		430	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		431	}
477		432
478	while (PL_curstackinfo->si_next)	433	while (PL_curstackinfo->si_next)
479	PL_curstackinfo = PL_curstackinfo->si_next;	434	PL_curstackinfo = PL_curstackinfo->si_next;
480		435
481	while (PL_curstackinfo)	436	while (PL_curstackinfo)
482	{	437	{
483	PERL_SI *p = PL_curstackinfo->si_prev;	438	PERL_SI *p = PL_curstackinfo->si_prev;
484		439
485	{	440	{ /*D*//*remove*/
486	dSP;	441	dSP;
487	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	442	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
488	PUTBACK; /* possibly superfluous */	443	PUTBACK; /* possibly superfluous */
489	}	444	}
490		445
491	dounwind(-1);	446	if (!IN_DESTRUCT)
492		447	{
		448	dounwind (-1);/*D*//*remove*/
493	SvREFCNT_dec(PL_curstackinfo->si_stack);	449	SvREFCNT_dec (PL_curstackinfo->si_stack);
		450	}
		451
494	Safefree(PL_curstackinfo->si_cxstack);	452	Safefree (PL_curstackinfo->si_cxstack);
495	Safefree(PL_curstackinfo);	453	Safefree (PL_curstackinfo);
496	PL_curstackinfo = p;	454	PL_curstackinfo = p;
497	}	455	}
498		456
499	Safefree(PL_tmps_stack);	457	Safefree (PL_tmps_stack);
500	Safefree(PL_markstack);	458	Safefree (PL_markstack);
501	Safefree(PL_scopestack);	459	Safefree (PL_scopestack);
502	Safefree(PL_savestack);	460	Safefree (PL_savestack);
		461	#if !PERL_VERSION_ATLEAST (5,9,0)
503	Safefree(PL_retstack);	462	Safefree (PL_retstack);
504	}
505
506	static void
507	allocate_stack (Coro__State ctx)
508	{
509	#ifdef HAVE_MMAP
510	ctx->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
511	ctx->sptr = mmap (0, ctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
512	if (ctx->sptr == (void *)-1)
513	#endif	463	#endif
514	{
515	/*FIXME*//*D*//* reasonable stack size! */
516	ctx->ssize = 4096 * sizeof (long);
517	New (0, ctx->sptr, 4096, long);
518	}
519	}	464	}
520		465
521	static void	466	static void
522	deallocate_stack (Coro__State ctx)	467	setup_coro (struct coro *coro)
523	{
524	#ifdef HAVE_MMAP
525	munmap (ctx->sptr, ctx->ssize);
526	#else
527	Safefree (ctx->sptr);
528	#endif
529	}
530
531	/* might go away together with optional SAVE_CCTXT */
532	static void
533	setup_coro (void *arg)
534	{	468	{
535	/*	469	/*
536	* emulate part of the perl startup here.	470	* emulate part of the perl startup here.
537	*/	471	*/
		472
		473	coro_init_stacks ();
		474
		475	PL_curcop = 0;
		476	PL_in_eval = 0;
		477	PL_curpm = 0;
		478
		479	{
		480	dSP;
		481	LOGOP myop;
		482
		483	/* I have no idea why this is needed, but it is */
		484	PUSHMARK (SP);
		485
		486	SvREFCNT_dec (GvAV (PL_defgv));
		487	GvAV (PL_defgv) = coro->args; coro->args = 0;
		488
		489	Zero (&myop, 1, LOGOP);
		490	myop.op_next = Nullop;
		491	myop.op_flags = OPf_WANT_VOID;
		492
		493	PL_op = (OP *)&myop;
		494
		495	PUSHMARK (SP);
		496	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		497	PUTBACK;
		498	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		499	SPAGAIN;
		500
		501	ENTER; /* necessary e.g. for dounwind */
		502	}
		503	}
		504
		505	static void
		506	free_coro_mortal ()
		507	{
		508	if (coro_mortal)
		509	{
		510	SvREFCNT_dec (coro_mortal);
		511	coro_mortal = 0;
		512	}
		513	}
		514
		515	static void NOINLINE
		516	prepare_cctx (coro_cctx *cctx)
		517	{
538	dSP;	518	dSP;
539	Coro__State ctx = (Coro__State)arg;	519	LOGOP myop;
540	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
541		520
542	coro_init_stacks (aTHX);	521	Zero (&myop, 1, LOGOP);
543	JMPENV_BOOTSTRAP;	522	myop.op_next = PL_op;
		523	myop.op_flags = OPf_WANT_VOID;
		524
		525	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		526
		527	PUSHMARK (SP);
		528	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		529	PUTBACK;
		530	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
544	SPAGAIN;	531	SPAGAIN;
		532	}
545		533
546	/*PL_curcop = 0;*/	534	static void
547	SvREFCNT_dec (GvAV (PL_defgv));	535	coro_run (void *arg)
548	GvAV (PL_defgv) = ctx->args;	536	{
		537	/* coro_run is the alternative epilogue of transfer() */
		538	UNLOCK;
549		539
550	if (ctx->sptr)	540	/*
		541	* this is a _very_ stripped down perl interpreter ;)
		542	*/
		543	PL_top_env = &PL_start_env;
		544
		545	/* inject call to cctx_init */
		546	prepare_cctx ((coro_cctx *)arg);
		547
		548	/* somebody will hit me for both perl_run and PL_restartop */
		549	perl_run (PL_curinterp);
		550
		551	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		552	abort ();
		553	}
		554
		555	static coro_cctx *
		556	cctx_new ()
		557	{
		558	coro_cctx *cctx;
		559
		560	++cctx_count;
		561
		562	New (0, cctx, 1, coro_cctx);
		563
		564	#if HAVE_MMAP
		565
		566	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		567	/* mmap suppsedly does allocate-on-write for us */
		568	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		569
		570	if (cctx->sptr == (void *)-1)
551	{	571	{
552	PUSHMARK(SP);	572	perror ("FATAL: unable to mmap stack for coroutine");
553	PUTBACK;	573	_exit (EXIT_FAILURE);
554	(void) call_sv (sub_init, G_VOID|G_NOARGS);	574	}
555	croak ("FATAL: CCTXT coroutine returned!");	575
		576	# if STACKGUARD
		577	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		578	# endif
		579
		580	#else
		581
		582	cctx->ssize = STACKSIZE * (long)sizeof (long);
		583	New (0, cctx->sptr, STACKSIZE, long);
		584
		585	if (!cctx->sptr)
		586	{
		587	perror ("FATAL: unable to malloc stack for coroutine");
		588	_exit (EXIT_FAILURE);
		589	}
		590
		591	#endif
		592
		593	#if USE_VALGRIND
		594	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		595	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		596	cctx->ssize + (char *)cctx->sptr
		597	);
		598	#endif
		599
		600	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		601
		602	return cctx;
		603	}
		604
		605	static void
		606	cctx_free (coro_cctx *cctx)
		607	{
		608	if (!cctx)
		609	return;
		610
		611	--cctx_count;
		612
		613	#if USE_VALGRIND
		614	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		615	#endif
		616
		617	#if HAVE_MMAP
		618	munmap (cctx->sptr, cctx->ssize);
		619	#else
		620	Safefree (cctx->sptr);
		621	#endif
		622
		623	Safefree (cctx);
		624	}
		625
		626	static coro_cctx *
		627	cctx_get ()
		628	{
		629	coro_cctx *cctx;
		630
		631	if (cctx_first)
		632	{
		633	--cctx_idle;
		634	cctx = cctx_first;
		635	cctx_first = cctx->next;
556	}	636	}
557	else	637	else
		638	{
		639	cctx = cctx_new ();
		640	PL_op = PL_op->op_next;
		641	}
		642
		643	return cctx;
		644	}
		645
		646	static void
		647	cctx_put (coro_cctx *cctx)
		648	{
		649	++cctx_idle;
		650	cctx->next = cctx_first;
		651	cctx_first = cctx;
		652	}
		653
		654	/* never call directly, always through the coro_state_transfer global variable */
		655	static void NOINLINE
		656	transfer (struct coro *prev, struct coro *next, int flags)
		657	{
		658	dSTACKLEVEL;
		659
		660	/* sometimes transfer is only called to set idle_sp */
		661	if (flags == TRANSFER_SET_STACKLEVEL)
		662	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		663	else if (prev != next)
558	{	664	{
559	UNOP myop;	665	coro_cctx *prev__cctx;
560		666
561	PL_op = (OP *)&myop;	667	LOCK;
562		668
563	Zero(&myop, 1, UNOP);
564	myop.op_next = Nullop;
565	myop.op_flags = OPf_WANT_VOID;
566
567	PUSHMARK(SP);
568	XPUSHs (sub_init);
569	/*
570	* the next line is slightly wrong, as PL_op->op_next
571	* is actually being executed so we skip the first op.
572	* that doesn't matter, though, since it is only
573	* pp_nextstate and we never return...
574	* ah yes, and I don't care anyways ;)
575	*/
576	PUTBACK;
577	PL_op = pp_entersub();
578	SPAGAIN;
579
580	ENTER; /* necessary e.g. for dounwind */
581	}
582	}
583
584	STATIC void
585	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
586	{
587	dSP;
588
589	if (prev != next)
590	{
591	/*
592	* this could be done in newprocess which would lead to
593	* extremely elegant and fast (basically just SAVE/LOAD)
594	* code here, but lazy allocation of stacks has also
595	* some virtues and the overhead of the if() is nil.
596	*/
597	if (next->mainstack)	669	if (next->mainstack)
598	{	670	{
		671	/* coroutine already started */
599	SAVE (prev, flags);	672	SAVE (prev, flags);
600	LOAD (next);	673	LOAD (next);
601
602	/* mark this state as in-use */
603	next->mainstack = 0;
604	next->tmps_ix = -2;
605
606	if (flags & TRANSFER_SAVE_CCTXT)
607	{
608	if (!next->ssize)
609	croak ("destination coroutine has no CCTXT (%p, %d)", next->sptr, next->ssize);
610
611	if (!prev->ssize)
612	prev->ssize = 1; /* mark cctx as valid ;) */
613
614	coro_transfer (&(prev->cctx), &(next->cctx));
615	}
616
617	}	674	}
618	else if (next->tmps_ix == -2)
619	croak ("tried to transfer to running coroutine");
620	else	675	else
621	{	676	{
		677	/* need to start coroutine */
622	SAVE (prev, -1); /* first get rid of the old state */	678	/* first get rid of the old state */
623		679	SAVE (prev, -1);
624	if (flags & TRANSFER_SAVE_CCTXT)	680	/* setup coroutine call */
625	{
626	if (!next->ssize)
627	{
628	allocate_stack (next);
629	coro_create (&(next->cctx),
630	setup_coro, (void *)next,
631	next->sptr, next->ssize);
632	}
633
634	if (!prev->ssize)
635	prev->ssize = 1; /* mark cctx as valid ;) */
636
637	coro_transfer (&(prev->cctx), &(next->cctx));
638	}
639	else
640	setup_coro (next);	681	setup_coro (next);
		682	/* need a stack */
		683	next->cctx = 0;
641	}	684	}
		685
		686	if (!prev->cctx)
		687	/* create a new empty context */
		688	Newz (0, prev->cctx, 1, coro_cctx);
		689
		690	prev__cctx = prev->cctx;
		691
		692	/* possibly "free" the cctx */
		693	if (prev__cctx->idle_sp == STACKLEVEL)
		694	{
		695	cctx_put (prev__cctx);
		696	prev->cctx = 0;
		697	}
		698
		699	if (!next->cctx)
		700	next->cctx = cctx_get ();
		701
		702	if (prev__cctx != next->cctx)
		703	{
		704	prev__cctx->top_env = PL_top_env;
		705	PL_top_env = next->cctx->top_env;
		706	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		707	}
		708
		709	free_coro_mortal ();
		710
		711	UNLOCK;
642	}	712	}
643	}	713	}
644		714
		715	struct transfer_args
		716	{
		717	struct coro *prev, *next;
		718	int flags;
		719	};
		720
		721	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		722
		723	static void
		724	coro_state_destroy (struct coro *coro)
		725	{
		726	if (coro->refcnt--)
		727	return;
		728
		729	if (coro->mainstack && coro->mainstack != main_mainstack)
		730	{
		731	struct coro temp;
		732
		733	SAVE ((&temp), TRANSFER_SAVE_ALL);
		734	LOAD (coro);
		735
		736	coro_destroy_stacks ();
		737
		738	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		739
		740	coro->mainstack = 0;
		741	}
		742
		743	cctx_free (coro->cctx);
		744	SvREFCNT_dec (coro->args);
		745	Safefree (coro);
		746	}
		747
		748	static int
		749	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		750	{
		751	struct coro *coro = (struct coro *)mg->mg_ptr;
		752	mg->mg_ptr = 0;
		753
		754	coro_state_destroy (coro);
		755
		756	return 0;
		757	}
		758
		759	static int
		760	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		761	{
		762	struct coro *coro = (struct coro *)mg->mg_ptr;
		763
		764	++coro->refcnt;
		765
		766	return 0;
		767	}
		768
		769	static MGVTBL coro_state_vtbl = {
		770	0, 0, 0, 0,
		771	coro_state_clear,
		772	0,
		773	#ifdef MGf_DUP
		774	coro_state_dup,
		775	#else
		776	# define MGf_DUP 0
		777	#endif
		778	};
		779
		780	static struct coro *
		781	SvSTATE (SV *coro)
		782	{
		783	HV *stash;
		784	MAGIC *mg;
		785
		786	if (SvROK (coro))
		787	coro = SvRV (coro);
		788
		789	stash = SvSTASH (coro);
		790	if (stash != coro_stash && stash != coro_state_stash)
		791	{
		792	/* very slow, but rare, check */
		793	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		794	croak ("Coro::State object required");
		795	}
		796
		797	mg = SvMAGIC (coro);
		798	assert (mg->mg_type == PERL_MAGIC_ext);
		799	return (struct coro *)mg->mg_ptr;
		800	}
		801
		802	static void
		803	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		804	{
		805	ta->prev = SvSTATE (prev);
		806	ta->next = SvSTATE (next);
		807	ta->flags = flags;
		808	}
		809
		810	static void
		811	api_transfer (SV *prev, SV *next, int flags)
		812	{
		813	dTHX;
		814	struct transfer_args ta;
		815
		816	prepare_transfer (&ta, prev, next, flags);
		817	TRANSFER (ta);
		818	}
		819
		820	/** Coro ********************************************************************/
		821
		822	#define PRIO_MAX 3
		823	#define PRIO_HIGH 1
		824	#define PRIO_NORMAL 0
		825	#define PRIO_LOW -1
		826	#define PRIO_IDLE -3
		827	#define PRIO_MIN -4
		828
		829	/* for Coro.pm */
		830	static GV *coro_current, *coro_idle;
		831	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		832	static int coro_nready;
		833
		834	static void
		835	coro_enq (SV *sv)
		836	{
		837	int prio;
		838
		839	if (SvTYPE (sv) != SVt_PVHV)
		840	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		841
		842	prio = SvSTATE (sv)->prio;
		843
		844	av_push (coro_ready [prio - PRIO_MIN], sv);
		845	coro_nready++;
		846	}
		847
		848	static SV *
		849	coro_deq (int min_prio)
		850	{
		851	int prio = PRIO_MAX - PRIO_MIN;
		852
		853	min_prio -= PRIO_MIN;
		854	if (min_prio < 0)
		855	min_prio = 0;
		856
		857	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		858	if (AvFILLp (coro_ready [prio]) >= 0)
		859	{
		860	coro_nready--;
		861	return av_shift (coro_ready [prio]);
		862	}
		863
		864	return 0;
		865	}
		866
		867	static void
		868	api_ready (SV *coro)
		869	{
		870	dTHX;
		871
		872	if (SvROK (coro))
		873	coro = SvRV (coro);
		874
		875	LOCK;
		876	coro_enq (SvREFCNT_inc (coro));
		877	UNLOCK;
		878	}
		879
		880	static void
		881	prepare_schedule (struct transfer_args *ta)
		882	{
		883	SV *current, *prev, *next;
		884
		885	current = GvSV (coro_current);
		886
		887	for (;;)
		888	{
		889	LOCK;
		890	next = coro_deq (PRIO_MIN);
		891	UNLOCK;
		892
		893	if (next)
		894	break;
		895
		896	{
		897	dSP;
		898
		899	ENTER;
		900	SAVETMPS;
		901
		902	PUSHMARK (SP);
		903	PUTBACK;
		904	call_sv (GvSV (coro_idle), G_DISCARD);
		905
		906	FREETMPS;
		907	LEAVE;
		908	}
		909	}
		910
		911	prev = SvRV (current);
		912	SvRV (current) = next;
		913
		914	/* free this only after the transfer */
		915	LOCK;
		916	free_coro_mortal ();
		917	UNLOCK;
		918	coro_mortal = prev;
		919
		920	ta->prev = SvSTATE (prev);
		921	ta->next = SvSTATE (next);
		922	ta->flags = TRANSFER_SAVE_ALL;
		923	}
		924
		925	static void
		926	prepare_cede (struct transfer_args *ta)
		927	{
		928	LOCK;
		929	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
		930	UNLOCK;
		931
		932	prepare_schedule (ta);
		933	}
		934
		935	static void
		936	api_schedule (void)
		937	{
		938	dTHX;
		939	struct transfer_args ta;
		940
		941	prepare_schedule (&ta);
		942	TRANSFER (ta);
		943	}
		944
		945	static void
		946	api_cede (void)
		947	{
		948	dTHX;
		949	struct transfer_args ta;
		950
		951	prepare_cede (&ta);
		952	TRANSFER (ta);
		953	}
		954
645	MODULE = Coro::State PACKAGE = Coro::State	955	MODULE = Coro::State PACKAGE = Coro::State
646		956
647	PROTOTYPES: ENABLE	957	PROTOTYPES: DISABLE
648		958
649	BOOT:	959	BOOT:
650	{ /* {} necessary for stoopid perl-5.6.x */	960	{
		961	#ifdef USE_ITHREADS
		962	MUTEX_INIT (&coro_mutex);
		963	#endif
		964	BOOT_PAGESIZE;
		965
651	coro_state_stash = gv_stashpvn ("Coro::State", 10, TRUE);	966	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
652		967
653	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	968	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
654	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	969	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
655	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	970	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
656	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
657
658	if (!padlist_cache)
659	padlist_cache = newHV ();
660		971
661	main_mainstack = PL_mainstack;	972	main_mainstack = PL_mainstack;
662	}
663		973
664	Coro::State	974	coroapi.ver = CORO_API_VERSION;
665	_newprocess(args)	975	coroapi.transfer = api_transfer;
666	SV * args	976
667	PROTOTYPE: $	977	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		978	}
		979
		980	SV *
		981	new (char *klass, ...)
668	CODE:	982	CODE:
669	Coro__State coro;	983	{
		984	struct coro *coro;
		985	HV *hv;
		986	int i;
670		987
671	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
672	croak ("Coro::State::_newprocess expects an arrayref");
673
674	New (0, coro, 1, struct coro);	988	Newz (0, coro, 1, struct coro);
		989	coro->args = newAV ();
675		990
676	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	991	hv = newHV ();
677	coro->mainstack = 0; /* actual work is done inside transfer */	992	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
678	coro->sptr = 0;	993	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
679	coro->ssize = 0;
680		994
681	RETVAL = coro;	995	for (i = 1; i < items; i++)
		996	av_push (coro->args, newSVsv (ST (i)));
		997	}
682	OUTPUT:	998	OUTPUT:
683	RETVAL	999	RETVAL
684		1000
685	void	1001	void
686	transfer(prev, next, flags = TRANSFER_SAVE_ALL)	1002	_set_stacklevel (...)
687	Coro::State_or_hashref prev	1003	ALIAS:
688	Coro::State_or_hashref next	1004	Coro::State::transfer = 1
689	int flags	1005	Coro::schedule = 2
690	PROTOTYPE: @	1006	Coro::cede = 3
		1007	Coro::Cont::yield = 4
691	CODE:	1008	CODE:
692	transfer (aTHX_ prev, next, flags);	1009	{
		1010	struct transfer_args ta;
		1011
		1012	switch (ix)
		1013	{
		1014	case 0:
		1015	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1016	ta.next = 0;
		1017	ta.flags = TRANSFER_SET_STACKLEVEL;
		1018	break;
		1019
		1020	case 1:
		1021	if (items != 3)
		1022	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1023
		1024	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1025	break;
		1026
		1027	case 2:
		1028	prepare_schedule (&ta);
		1029	break;
		1030
		1031	case 3:
		1032	prepare_cede (&ta);
		1033	break;
		1034
		1035	case 4:
		1036	{
		1037	SV *yieldstack;
		1038	SV *sv;
		1039	AV *defav = GvAV (PL_defgv);
		1040
		1041	yieldstack = *hv_fetch (
		1042	(HV *)SvRV (GvSV (coro_current)),
		1043	"yieldstack", sizeof ("yieldstack") - 1,
		1044	0
		1045	);
		1046
		1047	/* set up @_ -- ugly */
		1048	av_clear (defav);
		1049	av_fill (defav, items - 1);
		1050	while (items--)
		1051	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1052
		1053	sv = av_pop ((AV *)SvRV (yieldstack));
		1054	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1055	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1056	ta.flags = 0;
		1057	SvREFCNT_dec (sv);
		1058	}
		1059	break;
		1060
		1061	}
		1062
		1063	TRANSFER (ta);
		1064	}
693		1065
694	void	1066	void
695	DESTROY(coro)	1067	_clone_state_from (SV *dst, SV *src)
696	Coro::State coro	1068	CODE:
		1069	{
		1070	struct coro *coro_src = SvSTATE (src);
		1071
		1072	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1073
		1074	++coro_src->refcnt;
		1075	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1076	}
		1077
		1078	void
		1079	_exit (code)
		1080	int code
		1081	PROTOTYPE: $
		1082	CODE:
		1083	_exit (code);
		1084
		1085	int
		1086	cctx_count ()
		1087	CODE:
		1088	RETVAL = cctx_count;
		1089	OUTPUT:
		1090	RETVAL
		1091
		1092	int
		1093	cctx_idle ()
		1094	CODE:
		1095	RETVAL = cctx_idle;
		1096	OUTPUT:
		1097	RETVAL
		1098
		1099	MODULE = Coro::State PACKAGE = Coro
		1100
		1101	BOOT:
		1102	{
		1103	int i;
		1104
		1105	coro_stash = gv_stashpv ("Coro", TRUE);
		1106
		1107	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1108	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1109	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1110	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1111	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1112	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1113
		1114	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1115	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1116
		1117	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1118	coro_ready[i] = newAV ();
		1119
		1120	{
		1121	SV *sv = perl_get_sv("Coro::API", 1);
		1122
		1123	coroapi.schedule = api_schedule;
		1124	coroapi.cede = api_cede;
		1125	coroapi.ready = api_ready;
		1126	coroapi.nready = &coro_nready;
		1127	coroapi.current = coro_current;
		1128
		1129	GCoroAPI = &coroapi;
		1130	sv_setiv (sv, (IV)&coroapi);
		1131	SvREADONLY_on (sv);
		1132	}
		1133	}
		1134
		1135	int
		1136	prio (Coro::State coro, int newprio = 0)
		1137	ALIAS:
		1138	nice = 1
697	CODE:	1139	CODE:
		1140	{
		1141	RETVAL = coro->prio;
698		1142
699	if (coro->mainstack && coro->mainstack != main_mainstack)	1143	if (items > 1)
700	{	1144	{
701	struct coro temp;	1145	if (ix)
		1146	newprio += coro->prio;
702		1147
703	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1148	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
704	LOAD(aTHX_ coro);	1149	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
705		1150
706	destroy_stacks (aTHX);	1151	coro->prio = newprio;
707
708	LOAD((&temp)); /* this will get rid of defsv etc.. */
709
710	coro->mainstack = 0;
711	}	1152	}
712		1153	}
713	if (coro->sptr)
714	{
715	deallocate_stack (coro);
716	coro->sptr = 0;
717	}
718
719	Safefree (coro);
720		1154
721	void	1155	void
722	flush()	1156	ready (SV *self)
		1157	PROTOTYPE: $
723	CODE:	1158	CODE:
724	#ifdef MAY_FLUSH	1159	api_ready (self);
725	flush_padlist_cache ();
726	#endif
727		1160
		1161	int
		1162	nready (...)
		1163	PROTOTYPE:
		1164	CODE:
		1165	RETVAL = coro_nready;
		1166	OUTPUT:
		1167	RETVAL
		1168
728	MODULE = Coro::State PACKAGE = Coro::Cont	1169	MODULE = Coro::State PACKAGE = Coro::AIO
729		1170
730	# this is slightly dirty	1171	SV *
		1172	_get_state ()
		1173	CODE:
		1174	{
		1175	struct {
		1176	int errorno;
		1177	int laststype;
		1178	int laststatval;
		1179	Stat_t statcache;
		1180	} data;
		1181
		1182	data.errorno = errno;
		1183	data.laststype = PL_laststype;
		1184	data.laststatval = PL_laststatval;
		1185	data.statcache = PL_statcache;
		1186
		1187	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1188	}
		1189	OUTPUT:
		1190	RETVAL
731		1191
732	void	1192	void
733	yield(...)	1193	_set_state (char *data_)
734	PROTOTYPE: @	1194	PROTOTYPE: $
735	CODE:	1195	CODE:
736	static SV *returnstk;	1196	{
737	SV *sv;	1197	struct {
738	AV *defav = GvAV (PL_defgv);	1198	int errorno;
739	struct coro *prev, *next;	1199	int laststype;
		1200	int laststatval;
		1201	Stat_t statcache;
		1202	} *data = (void *)data_;
740		1203
741	if (!returnstk)	1204	errno = data->errorno;
742	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1205	PL_laststype = data->laststype;
743		1206	PL_laststatval = data->laststatval;
744	/* set up @_ -- ugly */	1207	PL_statcache = data->statcache;
745	av_clear (defav);	1208	}
746	av_fill (defav, items - 1);
747	while (items--)
748	av_store (defav, items, SvREFCNT_inc (ST(items)));
749
750	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
751	sv = av_pop ((AV *)SvRV (returnstk));
752	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
753	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
754	SvREFCNT_dec (sv);
755
756	transfer(aTHX_ prev, next, 0);
757

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