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Comparing Coro/Coro/State.xs (file contents):
Revision 1.35 by root, Mon Sep 24 01:36:20 2001 UTC vs.
Revision 1.91 by root, Sat Nov 25 01:14:11 2006 UTC

		1	#define PERL_NO_GET_CONTEXT
		2
		3	#include "libcoro/coro.c"
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
5	#include "libcoro/coro.c"	9	#include "patchlevel.h"
6		10
		11	#if PERL_VERSION < 6
		12	# ifndef PL_ppaddr
		13	# define PL_ppaddr ppaddr
		14	# endif
		15	# ifndef call_sv
		16	# define call_sv perl_call_sv
		17	# endif
		18	# ifndef get_sv
		19	# define get_sv perl_get_sv
		20	# endif
		21	# ifndef get_cv
		22	# define get_cv perl_get_cv
		23	# endif
		24	# ifndef IS_PADGV
		25	# define IS_PADGV(v) 0
		26	# endif
		27	# ifndef IS_PADCONST
		28	# define IS_PADCONST(v) 0
		29	# endif
		30	#endif
		31
7	#include <signal.h>	32	#include <errno.h>
		33
		34	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		35	# undef STACKGUARD
		36	#endif
		37
		38	#ifndef STACKGUARD
		39	# define STACKGUARD 0
		40	#endif
8		41
9	#ifdef HAVE_MMAP	42	#ifdef HAVE_MMAP
10	# include <unistd.h>	43	# include <unistd.h>
11	# include <sys/mman.h>	44	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	45	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	46	# ifdef MAP_ANON
		47	# define MAP_ANONYMOUS MAP_ANON
15	# else	48	# else
16	# undef HAVE_MMAP	49	# undef HAVE_MMAP
17	# endif	50	# endif
18	# endif	51	# endif
		52	# include <limits.h>
		53	# ifndef PAGESIZE
		54	# define PAGESIZE pagesize
		55	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		56	static long pagesize;
		57	# else
		58	# define BOOT_PAGESIZE
19	#endif	59	# endif
		60	#endif
20		61
21	#define MAY_FLUSH /* increases codesize and is rarely used */
22
23	#define SUB_INIT "Coro::State::initialize"	62	#define SUB_INIT "Coro::State::initialize"
24	#define UCORO_STATE "_coro_state"
25		63
26	/* The next macro should declare a variable stacklevel that contains and approximation	64	/* The next macro should declare a variable stacklevel that contains and approximation
27	* to the current C stack pointer. Its property is that it changes with each call	65	* to the current C stack pointer. Its property is that it changes with each call
28	* and should be unique. */	66	* and should be unique. */
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	67	#define dSTACKLEVEL void *stacklevel = &stacklevel
…		…
32		70
33	#define labs(l) ((l) >= 0 ? (l) : -(l))	71	#define labs(l) ((l) >= 0 ? (l) : -(l))
34		72
35	#include "CoroAPI.h"	73	#include "CoroAPI.h"
36		74
		75	#ifdef USE_ITHREADS
		76	static perl_mutex coro_mutex;
		77	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		78	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		79	#else
		80	# define LOCK (void)0
		81	# define UNLOCK (void)0
		82	#endif
		83
37	static struct CoroAPI coroapi;	84	static struct CoroAPI coroapi;
		85	static AV *main_mainstack; /* used to differentiate between $main and others */
		86	static HV *coro_state_stash, *coro_stash;
		87	static SV *coro_mortal; /* will be freed after next transfer */
38		88
39	/* this is actually not only the c stack but also c registers etc... */	89	/* this is actually not just the c stack but also c registers etc... */
40	typedef struct {	90	typedef struct coro_stack {
41	int refcnt; /* pointer reference counter */	91	struct coro_stack *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		92
45	coro_context cctx;	93	void *idle_sp;
46
47	void *sptr;	94	void *sptr;
48	long ssize; /* positive == mmap, otherwise malloc */	95	long ssize; /* positive == mmap, otherwise malloc */
		96
		97	/* cpu state */
		98	coro_context cctx;
49	} coro_stack;	99	} coro_stack;
50		100
		101	static coro_stack *main_stack;
		102
51	struct coro {	103	struct coro {
52	/* the optional C context */
53	coro_stack *stack;
54	void *cursp;
55	int gencnt;
56
57	/* optionally saved, might be zero */	104	/* optionally saved, might be zero */
58	AV *defav;	105	AV *defav;
59	SV *defsv;	106	SV *defsv;
60	SV *errsv;	107	SV *errsv;
61		108
62	/* saved global state not related to stacks */	109	/* saved global state not related to stacks */
63	U8 dowarn;	110	U8 dowarn;
64	I32 in_eval;	111	I32 in_eval;
65		112
		113	/* the c stack, if any */
		114	coro_stack *stack;
		115
66	/* the stacks and related info (callchain etc..) */	116	/* the stacks and related info (callchain etc..) */
67	PERL_SI *curstackinfo;	117	PERL_SI *curstackinfo;
68	AV *curstack;	118	AV *curstack;
69	AV *mainstack;	119	AV *mainstack;
70	SV **stack_sp;	120	SV **stack_sp;
71	OP *op;	121	OP *op;
72	SV **curpad;	122	SV **curpad;
		123	AV *comppad;
		124	CV *compcv;
73	SV **stack_base;	125	SV **stack_base;
74	SV **stack_max;	126	SV **stack_max;
75	SV **tmps_stack;	127	SV **tmps_stack;
76	I32 tmps_floor;	128	I32 tmps_floor;
77	I32 tmps_ix;	129	I32 tmps_ix;
…		…
86	I32 savestack_ix;	138	I32 savestack_ix;
87	I32 savestack_max;	139	I32 savestack_max;
88	OP **retstack;	140	OP **retstack;
89	I32 retstack_ix;	141	I32 retstack_ix;
90	I32 retstack_max;	142	I32 retstack_max;
		143	PMOP *curpm;
91	COP *curcop;	144	COP *curcop;
92	JMPENV *top_env;	145	JMPENV *top_env;
93		146
		147	/* coro process data */
		148	int prio;
		149
94	/* data associated with this coroutine (initial args) */	150	/* data associated with this coroutine (initial args) */
95	AV *args;	151	AV *args;
		152	int refcnt;
96	};	153	};
97		154
98	typedef struct coro *Coro__State;	155	typedef struct coro *Coro__State;
99	typedef struct coro *Coro__State_or_hashref;	156	typedef struct coro *Coro__State_or_hashref;
100		157
101	static AV *main_mainstack; /* used to differentiate between $main and others */	158	static AV *
102	static HV *coro_state_stash;	159	coro_clone_padlist (pTHX_ CV *cv)
103	static SV *ucoro_state_sv;
104	static U32 ucoro_state_hash;
105	static HV *padlist_cache;
106
107	/* mostly copied from op.c:cv_clone2 */
108	STATIC AV *
109	clone_padlist (AV *protopadlist)
110	{	160	{
111	AV *av;	161	AV *padlist = CvPADLIST (cv);
112	I32 ix;
113	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
114	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
115	SV **pname = AvARRAY (protopad_name);
116	SV **ppad = AvARRAY (protopad);
117	I32 fname = AvFILLp (protopad_name);
118	I32 fpad = AvFILLp (protopad);
119	AV *newpadlist, *newpad_name, *newpad;	162	AV *newpadlist, *newpad;
120	SV **npad;
121
122	newpad_name = newAV ();
123	for (ix = fname; ix >= 0; ix--)
124	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
125
126	newpad = newAV ();
127	av_fill (newpad, AvFILLp (protopad));
128	npad = AvARRAY (newpad);
129		163
130	newpadlist = newAV ();	164	newpadlist = newAV ();
131	AvREAL_off (newpadlist);	165	AvREAL_off (newpadlist);
132	av_store (newpadlist, 0, (SV *) newpad_name);	166	#if PERL_VERSION < 9
		167	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		168	#else
		169	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		170	#endif
		171	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		172	--AvFILLp (padlist);
		173
		174	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
133	av_store (newpadlist, 1, (SV *) newpad);	175	av_store (newpadlist, 1, (SV *)newpad);
134		176
135	av = newAV (); /* will be @_ */	177	return newpadlist;
136	av_extend (av, 0);	178	}
137	av_store (newpad, 0, (SV *) av);
138	AvFLAGS (av) = AVf_REIFY;
139		179
140	for (ix = fpad; ix > 0; ix--)	180	static void
		181	free_padlist (pTHX_ AV *padlist)
		182	{
		183	/* may be during global destruction */
		184	if (SvREFCNT (padlist))
141	{	185	{
142	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	186	I32 i = AvFILLp (padlist);
143	if (namesv && namesv != &PL_sv_undef)	187	while (i >= 0)
144	{	188	{
145	char *name = SvPVX (namesv); /* XXX */	189	SV **svp = av_fetch (padlist, i--, FALSE);
146	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	190	if (svp)
147	{ /* lexical from outside? */
148	npad[ix] = SvREFCNT_inc (ppad[ix]);
149	}	191	{
150	else
151	{ /* our own lexical */
152	SV *sv;	192	SV *sv;
153	if (*name == '&')	193	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
154	sv = SvREFCNT_inc (ppad[ix]);	194	SvREFCNT_dec (sv);
155	else if (*name == '@')	195
156	sv = (SV *) newAV ();	196	SvREFCNT_dec (*svp);
157	else if (*name == '%')
158	sv = (SV *) newHV ();
159	else
160	sv = NEWSV (0, 0);
161	if (!SvPADBUSY (sv))
162	SvPADMY_on (sv);
163	npad[ix] = sv;
164	}	197	}
165	}	198	}
166	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	199
167	{	200	SvREFCNT_dec ((SV*)padlist);
168	npad[ix] = SvREFCNT_inc (ppad[ix]);
169	}
170	else
171	{
172	SV *sv = NEWSV (0, 0);
173	SvPADTMP_on (sv);
174	npad[ix] = sv;
175	}
176	}	201	}
		202	}
177		203
178	#if 0 /* return -ENOTUNDERSTOOD */	204	static int
179	/* Now that vars are all in place, clone nested closures. */	205	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		206	{
		207	AV *padlist;
		208	AV *av = (AV *)mg->mg_obj;
180		209
181	for (ix = fpad; ix > 0; ix--) {	210	/* casting is fun. */
182	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	211	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
183	if (namesv	212	free_padlist (aTHX_ padlist);
184	&& namesv != &PL_sv_undef	213
185	&& !(SvFLAGS(namesv) & SVf_FAKE)	214	SvREFCNT_dec (av);
186	&& *SvPVX(namesv) == '&'	215
187	&& CvCLONE(ppad[ix]))	216	return 0;
188	{	217	}
189	CV *kid = cv_clone((CV*)ppad[ix]);	218
190	SvREFCNT_dec(ppad[ix]);	219	#define PERL_MAGIC_coro PERL_MAGIC_ext
191	CvCLONE_on(kid);	220
192	SvPADMY_on(kid);	221	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
193	npad[ix] = (SV*)kid;	222
194	}	223	/* the next two functions merely cache the padlists */
		224	static void
		225	get_padlist (pTHX_ CV *cv)
		226	{
		227	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		228
		229	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
		230	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
		231	else
		232	{
		233	#if 0
		234	/* this should work - but it doesn't :( */
		235	CV *cp = Perl_cv_clone (aTHX_ cv);
		236	CvPADLIST (cv) = CvPADLIST (cp);
		237	CvPADLIST (cp) = 0;
		238	SvREFCNT_dec (cp);
		239	#else
		240	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		241	#endif
		242	}
		243	}
		244
		245	static void
		246	put_padlist (pTHX_ CV *cv)
		247	{
		248	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		249
		250	if (!mg)
		251	{
		252	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		253	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		254	mg->mg_virtual = &vtbl_coro;
		255	mg->mg_obj = (SV *)newAV ();
195	}	256	}
196	#endif
197		257
198	return newpadlist;
199	}
200
201	#ifdef MAY_FLUSH
202	STATIC void
203	free_padlist (AV *padlist)
204	{
205	/* may be during global destruction */
206	if (SvREFCNT(padlist))
207	{
208	I32 i = AvFILLp(padlist);
209	while (i >= 0)
210	{
211	SV **svp = av_fetch(padlist, i--, FALSE);
212	SV *sv = svp ? *svp : Nullsv;
213	if (sv)
214	SvREFCNT_dec(sv);
215	}
216
217	SvREFCNT_dec((SV*)padlist);
218	}
219	}
220	#endif
221
222	/* the next two functions merely cache the padlists */
223	STATIC void
224	get_padlist (CV *cv)
225	{
226	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
227
228	if (he && AvFILLp ((AV *)*he) >= 0)
229	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
230	else
231	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
232	}
233
234	STATIC void
235	put_padlist (CV *cv)
236	{
237	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
238
239	if (SvTYPE (*he) != SVt_PVAV)
240	{
241	SvREFCNT_dec (*he);
242	*he = (SV *)newAV ();
243	}
244
245	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	258	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
246	}	259	}
247
248	#ifdef MAY_FLUSH
249	STATIC void
250	flush_padlist_cache ()
251	{
252	HV *hv = padlist_cache;
253	padlist_cache = newHV ();
254
255	if (hv_iterinit (hv))
256	{
257	HE *he;
258	AV *padlist;
259
260	while (!!(he = hv_iternext (hv)))
261	{
262	AV *av = (AV *)HeVAL(he);
263
264	/* casting is fun. */
265	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
266	free_padlist (padlist);
267	}
268	}
269
270	SvREFCNT_dec (hv);
271	}
272	#endif
273		260
274	#define SB do {	261	#define SB do {
275	#define SE } while (0)	262	#define SE } while (0)
276		263
277	#define LOAD(state) load_state(aTHX_ (state));	264	#define LOAD(state) load_state(aTHX_ (state));
278	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	265	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
279		266
280	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	267	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
281		268
282	static void	269	static void
283	load_state(pTHX_ Coro__State c)	270	load_state(pTHX_ Coro__State c)
284	{	271	{
285	PL_dowarn = c->dowarn;	272	PL_dowarn = c->dowarn;
…		…
289	PL_curstack = c->curstack;	276	PL_curstack = c->curstack;
290	PL_mainstack = c->mainstack;	277	PL_mainstack = c->mainstack;
291	PL_stack_sp = c->stack_sp;	278	PL_stack_sp = c->stack_sp;
292	PL_op = c->op;	279	PL_op = c->op;
293	PL_curpad = c->curpad;	280	PL_curpad = c->curpad;
		281	PL_comppad = c->comppad;
		282	PL_compcv = c->compcv;
294	PL_stack_base = c->stack_base;	283	PL_stack_base = c->stack_base;
295	PL_stack_max = c->stack_max;	284	PL_stack_max = c->stack_max;
296	PL_tmps_stack = c->tmps_stack;	285	PL_tmps_stack = c->tmps_stack;
297	PL_tmps_floor = c->tmps_floor;	286	PL_tmps_floor = c->tmps_floor;
298	PL_tmps_ix = c->tmps_ix;	287	PL_tmps_ix = c->tmps_ix;
…		…
304	PL_scopestack_ix = c->scopestack_ix;	293	PL_scopestack_ix = c->scopestack_ix;
305	PL_scopestack_max = c->scopestack_max;	294	PL_scopestack_max = c->scopestack_max;
306	PL_savestack = c->savestack;	295	PL_savestack = c->savestack;
307	PL_savestack_ix = c->savestack_ix;	296	PL_savestack_ix = c->savestack_ix;
308	PL_savestack_max = c->savestack_max;	297	PL_savestack_max = c->savestack_max;
		298	#if PERL_VERSION < 9
309	PL_retstack = c->retstack;	299	PL_retstack = c->retstack;
310	PL_retstack_ix = c->retstack_ix;	300	PL_retstack_ix = c->retstack_ix;
311	PL_retstack_max = c->retstack_max;	301	PL_retstack_max = c->retstack_max;
		302	#endif
		303	PL_curpm = c->curpm;
312	PL_curcop = c->curcop;	304	PL_curcop = c->curcop;
313	PL_top_env = c->top_env;	305	PL_top_env = c->top_env;
314		306
315	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	307	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
316	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	308	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
…		…
325	{	317	{
326	AV *padlist = (AV *)POPs;	318	AV *padlist = (AV *)POPs;
327		319
328	if (padlist)	320	if (padlist)
329	{	321	{
330	put_padlist (cv); /* mark this padlist as available */	322	put_padlist (aTHX_ cv); /* mark this padlist as available */
331	CvPADLIST(cv) = padlist;	323	CvPADLIST(cv) = padlist;
332	#ifdef USE_THREADS
333	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
334	#endif
335	}	324	}
336		325
337	++CvDEPTH(cv);	326	++CvDEPTH(cv);
338	}	327	}
339		328
…		…
366	if (CxTYPE(cx) == CXt_SUB)	355	if (CxTYPE(cx) == CXt_SUB)
367	{	356	{
368	CV *cv = cx->blk_sub.cv;	357	CV *cv = cx->blk_sub.cv;
369	if (CvDEPTH(cv))	358	if (CvDEPTH(cv))
370	{	359	{
371	#ifdef USE_THREADS
372	/*XPUSHs ((SV *)CvOWNER(cv));*/
373	/*CvOWNER(cv) = 0;*/
374	/*error must unlock this cv etc.. etc...*/
375	#endif
376	EXTEND (SP, CvDEPTH(cv)*2);	360	EXTEND (SP, CvDEPTH(cv)*2);
377		361
378	while (--CvDEPTH(cv))	362	while (--CvDEPTH(cv))
379	{	363	{
380	/* this tells the restore code to increment CvDEPTH */	364	/* this tells the restore code to increment CvDEPTH */
…		…
383	}	367	}
384		368
385	PUSHs ((SV *)CvPADLIST(cv));	369	PUSHs ((SV *)CvPADLIST(cv));
386	PUSHs ((SV *)cv);	370	PUSHs ((SV *)cv);
387		371
388	get_padlist (cv); /* this is a monster */	372	get_padlist (aTHX_ cv);
389	}	373	}
390	}	374	}
		375	#ifdef CXt_FORMAT
391	else if (CxTYPE(cx) == CXt_FORMAT)	376	else if (CxTYPE(cx) == CXt_FORMAT)
392	{	377	{
393	/* I never used formats, so how should I know how these are implemented? */	378	/* I never used formats, so how should I know how these are implemented? */
394	/* my bold guess is as a simple, plain sub... */	379	/* my bold guess is as a simple, plain sub... */
395	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	380	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
396	}	381	}
		382	#endif
397	}	383	}
398		384
399	if (top_si->si_type == PERLSI_MAIN)	385	if (top_si->si_type == PERLSI_MAIN)
400	break;	386	break;
401		387
…		…
418	c->curstack = PL_curstack;	404	c->curstack = PL_curstack;
419	c->mainstack = PL_mainstack;	405	c->mainstack = PL_mainstack;
420	c->stack_sp = PL_stack_sp;	406	c->stack_sp = PL_stack_sp;
421	c->op = PL_op;	407	c->op = PL_op;
422	c->curpad = PL_curpad;	408	c->curpad = PL_curpad;
		409	c->comppad = PL_comppad;
		410	c->compcv = PL_compcv;
423	c->stack_base = PL_stack_base;	411	c->stack_base = PL_stack_base;
424	c->stack_max = PL_stack_max;	412	c->stack_max = PL_stack_max;
425	c->tmps_stack = PL_tmps_stack;	413	c->tmps_stack = PL_tmps_stack;
426	c->tmps_floor = PL_tmps_floor;	414	c->tmps_floor = PL_tmps_floor;
427	c->tmps_ix = PL_tmps_ix;	415	c->tmps_ix = PL_tmps_ix;
…		…
433	c->scopestack_ix = PL_scopestack_ix;	421	c->scopestack_ix = PL_scopestack_ix;
434	c->scopestack_max = PL_scopestack_max;	422	c->scopestack_max = PL_scopestack_max;
435	c->savestack = PL_savestack;	423	c->savestack = PL_savestack;
436	c->savestack_ix = PL_savestack_ix;	424	c->savestack_ix = PL_savestack_ix;
437	c->savestack_max = PL_savestack_max;	425	c->savestack_max = PL_savestack_max;
		426	#if PERL_VERSION < 9
438	c->retstack = PL_retstack;	427	c->retstack = PL_retstack;
439	c->retstack_ix = PL_retstack_ix;	428	c->retstack_ix = PL_retstack_ix;
440	c->retstack_max = PL_retstack_max;	429	c->retstack_max = PL_retstack_max;
		430	#endif
		431	c->curpm = PL_curpm;
441	c->curcop = PL_curcop;	432	c->curcop = PL_curcop;
442	c->top_env = PL_top_env;	433	c->top_env = PL_top_env;
443	}	434	}
444		435
445	/*	436	/*
446	* allocate various perl stacks. This is an exact copy	437	* allocate various perl stacks. This is an exact copy
447	* of perl.c:init_stacks, except that it uses less memory	438	* of perl.c:init_stacks, except that it uses less memory
448	* on the assumption that coroutines do not usually need	439	* on the (sometimes correct) assumption that coroutines do
449	* a lot of stackspace.	440	* not usually need a lot of stackspace.
450	*/	441	*/
451	STATIC void	442	static void
452	coro_init_stacks (pTHX)	443	coro_init_stacks (pTHX)
453	{	444	{
		445	LOCK;
		446
454	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	447	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
455	PL_curstackinfo->si_type = PERLSI_MAIN;	448	PL_curstackinfo->si_type = PERLSI_MAIN;
456	PL_curstack = PL_curstackinfo->si_stack;	449	PL_curstack = PL_curstackinfo->si_stack;
457	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	450	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
458		451
…		…
467		460
468	New(54,PL_markstack,16,I32);	461	New(54,PL_markstack,16,I32);
469	PL_markstack_ptr = PL_markstack;	462	PL_markstack_ptr = PL_markstack;
470	PL_markstack_max = PL_markstack + 16;	463	PL_markstack_max = PL_markstack + 16;
471		464
		465	#ifdef SET_MARK_OFFSET
472	SET_MARK_OFFSET;	466	SET_MARK_OFFSET;
		467	#endif
473		468
474	New(54,PL_scopestack,16,I32);	469	New(54,PL_scopestack,16,I32);
475	PL_scopestack_ix = 0;	470	PL_scopestack_ix = 0;
476	PL_scopestack_max = 16;	471	PL_scopestack_max = 16;
477		472
478	New(54,PL_savestack,96,ANY);	473	New(54,PL_savestack,96,ANY);
479	PL_savestack_ix = 0;	474	PL_savestack_ix = 0;
480	PL_savestack_max = 96;	475	PL_savestack_max = 96;
481		476
		477	#if PERL_VERSION < 9
482	New(54,PL_retstack,8,OP*);	478	New(54,PL_retstack,8,OP*);
483	PL_retstack_ix = 0;	479	PL_retstack_ix = 0;
484	PL_retstack_max = 8;	480	PL_retstack_max = 8;
		481	#endif
		482
		483	UNLOCK;
485	}	484	}
486		485
487	/*	486	/*
488	* destroy the stacks, the callchain etc...	487	* destroy the stacks, the callchain etc...
489	* still there is a memleak of 128 bytes...
490	*/	488	*/
491	STATIC void	489	static void
492	destroy_stacks(pTHX)	490	destroy_stacks(pTHX)
493	{	491	{
494	if (!IN_DESTRUCT)	492	if (!IN_DESTRUCT)
495	{	493	{
496	/* is this ugly, I ask? */	494	/* is this ugly, I ask? */
497	while (PL_scopestack_ix)	495	LEAVE_SCOPE (0);
498	LEAVE;
499		496
500	/* sure it is, but more important: is it correct?? :/ */	497	/* sure it is, but more important: is it correct?? :/ */
501	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
502	FREETMPS;	498	FREETMPS;
		499
		500	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
503	}	501	}
504		502
505	while (PL_curstackinfo->si_next)	503	while (PL_curstackinfo->si_next)
506	PL_curstackinfo = PL_curstackinfo->si_next;	504	PL_curstackinfo = PL_curstackinfo->si_next;
507		505
508	while (PL_curstackinfo)	506	while (PL_curstackinfo)
509	{	507	{
510	PERL_SI *p = PL_curstackinfo->si_prev;	508	PERL_SI *p = PL_curstackinfo->si_prev;
511		509
512	{	510	{ /*D*//*remove*/
513	dSP;	511	dSP;
514	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	512	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
515	PUTBACK; /* possibly superfluous */	513	PUTBACK; /* possibly superfluous */
516	}	514	}
517		515
518	if (!IN_DESTRUCT)	516	if (!IN_DESTRUCT)
519	{	517	{
520	dounwind(-1);	518	dounwind (-1);/*D*//*remove*/
521	SvREFCNT_dec(PL_curstackinfo->si_stack);	519	SvREFCNT_dec (PL_curstackinfo->si_stack);
522	}	520	}
523		521
524	Safefree(PL_curstackinfo->si_cxstack);	522	Safefree (PL_curstackinfo->si_cxstack);
525	Safefree(PL_curstackinfo);	523	Safefree (PL_curstackinfo);
526	PL_curstackinfo = p;	524	PL_curstackinfo = p;
527	}	525	}
528		526
529	Safefree(PL_tmps_stack);	527	Safefree (PL_tmps_stack);
530	Safefree(PL_markstack);	528	Safefree (PL_markstack);
531	Safefree(PL_scopestack);	529	Safefree (PL_scopestack);
532	Safefree(PL_savestack);	530	Safefree (PL_savestack);
		531	#if PERL_VERSION < 9
533	Safefree(PL_retstack);	532	Safefree (PL_retstack);
534	}
535
536	static void
537	allocate_stack (Coro__State ctx, int alloc)
538	{
539	coro_stack *stack;
540
541	New (0, stack, 1, coro_stack);
542
543	stack->refcnt = 1;
544	stack->usecnt = 1;
545	stack->gencnt = ctx->gencnt = 0;
546	if (alloc)
547	{
548	#ifdef HAVE_MMAP
549	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
550	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
551	if (stack->sptr == (void *)-1)
552	#endif	533	#endif
553	{
554	/*FIXME*//*D*//* reasonable stack size! */
555	stack->ssize = -4096 * sizeof (long);
556	New (0, stack->sptr, 4096, long);
557	}
558	}
559	else
560	stack->sptr = 0;
561
562	ctx->stack = stack;
563	}	534	}
564		535
565	static void	536	static void
566	deallocate_stack (Coro__State ctx)	537	setup_coro (struct coro *coro)
567	{
568	coro_stack *stack = ctx->stack;
569
570	ctx->stack = 0;
571
572	if (stack)
573	{
574	if (!--stack->refcnt)
575	{
576	#ifdef HAVE_MMAP
577	if (stack->ssize > 0 && stack->sptr)
578	munmap (stack->sptr, stack->ssize);
579	else
580	#else
581	Safefree (stack->sptr);
582	#endif
583	Safefree (stack);
584	}
585	else if (ctx->gencnt == stack->gencnt)
586	--stack->usecnt;
587	}
588	}
589
590	static void
591	setup_coro (void *arg)
592	{	538	{
593	/*	539	/*
594	* emulate part of the perl startup here.	540	* emulate part of the perl startup here.
595	*/	541	*/
		542	dTHX;
596	dSP;	543	dSP;
597	Coro__State ctx = (Coro__State)arg;	544	UNOP myop;
598	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);	545	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
599		546
600	coro_init_stacks (aTHX);	547	coro_init_stacks (aTHX);
601	/*PL_curcop = 0;*/	548	/*PL_curcop = 0;*/
602	/*PL_in_eval = PL_in_eval;*/ /* inherit */	549	/*PL_in_eval = PL_in_eval;*/ /* inherit */
603	SvREFCNT_dec (GvAV (PL_defgv));	550	SvREFCNT_dec (GvAV (PL_defgv));
604	GvAV (PL_defgv) = ctx->args;	551	GvAV (PL_defgv) = coro->args; coro->args = 0;
605		552
606	SPAGAIN;	553	SPAGAIN;
607		554
608	if (ctx->stack)	555	Zero (&myop, 1, UNOP);
609	{	556	myop.op_next = Nullop;
610	ctx->cursp = 0;	557	myop.op_flags = OPf_WANT_VOID;
611		558
		559	PL_op = (OP *)&myop;
		560
612	PUSHMARK(SP);	561	PUSHMARK(SP);
		562	XPUSHs (sub_init);
613	PUTBACK;	563	PUTBACK;
614	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);	564	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		565	SPAGAIN;
615		566
616	if (SvTRUE (ERRSV))	567	ENTER; /* necessary e.g. for dounwind */
617	croak (NULL);	568	}
618	else	569
619	croak ("FATAL: CCTXT coroutine returned!");	570	static void
		571	transfer_tail ()
		572	{
		573	if (coro_mortal)
		574	{
		575	SvREFCNT_dec (coro_mortal);
		576	coro_mortal = 0;
620	}	577	}
621	else
622	{
623	UNOP myop;
624		578
625	PL_op = (OP *)&myop;	579	UNLOCK;
626
627	Zero(&myop, 1, UNOP);
628	myop.op_next = Nullop;
629	myop.op_flags = OPf_WANT_VOID;
630
631	PUSHMARK(SP);
632	XPUSHs (sub_init);
633	/*
634	* the next line is slightly wrong, as PL_op->op_next
635	* is actually being executed so we skip the first op.
636	* that doesn't matter, though, since it is only
637	* pp_nextstate and we never return...
638	* ah yes, and I don't care anyways ;)
639	*/
640	PUTBACK;
641	PL_op = pp_entersub();
642	SPAGAIN;
643
644	ENTER; /* necessary e.g. for dounwind */
645	}
646	}	580	}
647		581
648	static void	582	static void
649	continue_coro (void *arg)	583	coro_run (void *arg)
650	{	584	{
651	/*	585	/*
652	* this is a _very_ stripped down perl interpreter ;)	586	* this is a _very_ stripped down perl interpreter ;)
653	*/	587	*/
654	Coro__State ctx = (Coro__State)arg;	588	dTHX;
655	JMPENV coro_start_env;
656		589
657	/* same as JMPENV_BOOTSTRAP */	590	transfer_tail ();
658	Zero(&coro_start_env, 1, JMPENV);	591
659	coro_start_env.je_ret = -1;
660	coro_start_env.je_mustcatch = TRUE;
661	PL_top_env = &coro_start_env;	592	PL_top_env = &PL_start_env;
662		593	PL_restartop = PL_op;
663	ctx->cursp = 0;	594	/* somebody will hit me for both perl_run and PL_restart_top */
664	PL_op = PL_op->op_next;	595	perl_run (aTHX_ PERL_GET_CONTEXT);
665	CALLRUNOPS(aTHX);
666		596
667	abort ();	597	abort ();
668	}	598	}
669		599
670	STATIC void	600	static coro_stack *
		601	stack_new ()
		602	{
		603	coro_stack *stack;
		604
		605	New (0, stack, 1, coro_stack);
		606
		607	#if HAVE_MMAP
		608
		609	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */
		610	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		611
		612	if (stack->sptr == (void *)-1)
		613	{
		614	fprintf (stderr, "FATAL: unable to mmap stack for coroutine\n");
		615	_exit (EXIT_FAILURE);
		616	}
		617
		618	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		619
		620	#else
		621
		622	stack->ssize = STACKSIZE * (long)sizeof (long);
		623	New (0, stack->sptr, STACKSIZE, long);
		624
		625	if (!stack->sptr)
		626	{
		627	fprintf (stderr, "FATAL: unable to malloc stack for coroutine\n");
		628	_exit (EXIT_FAILURE);
		629	}
		630
		631	#endif
		632
		633	coro_create (&stack->cctx, coro_run, 0, stack->sptr, stack->ssize);
		634
		635	return stack;
		636	}
		637
		638	static void
		639	stack_free (coro_stack *stack)
		640	{
		641	if (!stack || stack == main_stack)
		642	return;
		643
		644	#if HAVE_MMAP
		645	munmap (stack->sptr, stack->ssize);
		646	#else
		647	Safefree (stack->sptr);
		648	#endif
		649
		650	Safefree (stack);
		651	}
		652
		653	static coro_stack *stack_first;
		654
		655	static coro_stack *
		656	stack_get ()
		657	{
		658	coro_stack *stack;
		659
		660	if (stack_first)
		661	{
		662	stack = stack_first;
		663	stack_first = stack->next;
		664	}
		665	else
		666	{
		667	stack = stack_new ();
		668	PL_op = PL_op->op_next;
		669	}
		670
		671	return stack;
		672	}
		673
		674	static void
		675	stack_put (coro_stack *stack)
		676	{
		677	stack->next = stack_first;
		678	stack_first = stack;
		679	}
		680
		681	/* never call directly, always through the coro_state_transfer global variable */
		682	static void
671	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	683	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)
672	{	684	{
673	dSTACKLEVEL;	685	dSTACKLEVEL;
674	static struct coro *xnext;	686
		687	/* sometimes transfer is only called to set idle_sp */
		688	if (!prev->stack->idle_sp)
		689	prev->stack->idle_sp = stacklevel;
		690
		691	LOCK;
675		692
676	if (prev != next)	693	if (prev != next)
677	{	694	{
678	xnext = next;	695	coro_stack *prev_stack = prev->stack;
		696
		697	/* possibly "free" the stack */
		698	if (0 && prev_stack->idle_sp == stacklevel)
		699	{
		700	stack_put (prev_stack);
		701	prev->stack = 0;
		702	}
679		703
680	if (next->mainstack)	704	if (next->mainstack)
681	{	705	{
		706	/* coroutine already started */
682	SAVE (prev, flags);	707	SAVE (prev, flags);
683	LOAD (next);	708	LOAD (next);
684
685	/* mark this state as in-use */
686	next->mainstack = 0;
687	next->tmps_ix = -2;
688
689	/* stacklevel changed? if yes, grab the stack for us! */
690	if (flags & TRANSFER_SAVE_CCTXT)
691	{
692	if (!prev->stack)
693	allocate_stack (prev, 0);
694	else if (prev->cursp != stacklevel
695	&& prev->stack->usecnt > 1)
696	{
697	prev->gencnt = ++prev->stack->gencnt;
698	prev->stack->usecnt = 1;
699	}
700
701	/* has our stack been invalidated? */
702	if (next->stack && next->stack->gencnt != next->gencnt)
703	{
704	deallocate_stack (next);
705	allocate_stack (next, 1);
706	coro_create (&(next->stack->cctx),
707	continue_coro, (void *)next,
708	next->stack->sptr, labs (next->stack->ssize));
709	}
710
711	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
712	/* don't add any code here */
713	}
714
715	}	709	}
716	else if (next->tmps_ix == -2)
717	croak ("tried to transfer to running coroutine");
718	else	710	else
719	{	711	{
		712	/* need to start coroutine */
720	SAVE (prev, -1); /* first get rid of the old state */	713	/* first get rid of the old state */
721		714	SAVE (prev, -1);
722	if (flags & TRANSFER_SAVE_CCTXT)	715	/* setup coroutine call */
723	{
724	if (!prev->stack)
725	allocate_stack (prev, 0);
726
727	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728	{
729	setup_coro (next);
730
731	prev->stack->refcnt++;
732	prev->stack->usecnt++;
733	next->stack = prev->stack;
734	next->gencnt = prev->gencnt;
735	}
736	else
737	{
738	allocate_stack (next, 1);
739	coro_create (&(next->stack->cctx),
740	setup_coro, (void *)next,
741	next->stack->sptr, labs (next->stack->ssize));
742	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743	/* don't add any code here */
744	}
745	}
746	else
747	setup_coro (next);	716	setup_coro (next);
		717	/* need to change stack from main_stack to real one */
		718	next->stack = 0;
748	}	719	}
749		720
750	/*	721	if (!next->stack)
751	* xnext is now either prev or next, depending on wether	722	next->stack = stack_get ();
752	* we switched the c stack or not. that's why i use a global	723
753	* variable, that should become thread-specific at one point.	724	if (prev_stack != next->stack)
754	*/	725	coro_transfer (&prev_stack->cctx, &next->stack->cctx);
755	xnext->cursp = stacklevel;
756	}	726	}
		727
		728	transfer_tail ();
757	}	729	}
		730
		731	/* use this function pointer to call the above function */
		732	/* this is done to increase chances of the compiler not inlining the call */
		733	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
		734
		735	static void
		736	coro_state_destroy (struct coro *coro)
		737	{
		738	if (coro->refcnt--)
		739	return;
		740
		741	if (coro->mainstack && coro->mainstack != main_mainstack)
		742	{
		743	struct coro temp;
		744
		745	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
		746	LOAD (aTHX_ coro);
		747
		748	destroy_stacks (aTHX);
		749
		750	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		751
		752	coro->mainstack = 0;
		753	}
		754
		755	stack_free (coro->stack);
		756	SvREFCNT_dec (coro->args);
		757	Safefree (coro);
		758	}
		759
		760	static int
		761	coro_state_clear (SV *sv, MAGIC *mg)
		762	{
		763	struct coro *coro = (struct coro *)mg->mg_ptr;
		764	mg->mg_ptr = 0;
		765
		766	coro_state_destroy (coro);
		767
		768	return 0;
		769	}
		770
		771	static int
		772	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)
		773	{
		774	struct coro *coro = (struct coro *)mg->mg_ptr;
		775
		776	++coro->refcnt;
		777
		778	return 0;
		779	}
		780
		781	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };
758		782
759	static struct coro *	783	static struct coro *
760	sv_to_coro (SV *arg, const char *funcname, const char *varname)	784	SvSTATE (SV *coro)
761	{	785	{
762	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	786	HV *stash;
763	{	787	MAGIC *mg;
764	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);
765		788
766	if (!he)	789	if (SvROK (coro))
767	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);	790	coro = SvRV (coro);
768		791
769	arg = HeVAL(he);	792	stash = SvSTASH (coro);
		793	if (stash != coro_stash && stash != coro_state_stash)
		794	{
		795	/* very slow, but rare, check */
		796	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		797	croak ("Coro::State object required");
770	}	798	}
771
772	/* must also be changed inside Coro::Cont::yield */
773	if (SvROK(arg) && SvOBJECT(SvRV(arg))
774	&& SvSTASH(SvRV(arg)) == coro_state_stash)
775	return (struct coro *) SvIV((SV*)SvRV(arg));
776		799
777	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	800	mg = SvMAGIC (coro);
778	/*NORETURN*/	801	assert (mg->mg_type == PERL_MAGIC_ext);
		802	return (struct coro *)mg->mg_ptr;
779	}	803	}
780		804
781	static void	805	static void
782	api_transfer(pTHX_ SV *prev, SV *next, int flags)	806	api_transfer (pTHX_ SV *prev, SV *next, int flags)
783	{	807	{
784	transfer(aTHX_	808	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);
785	sv_to_coro (prev, "Coro::transfer", "prev"),
786	sv_to_coro (next, "Coro::transfer", "next"),
787	flags);
788	}	809	}
789		810
790	/** Coro ********************************************************************/	811	/** Coro ********************************************************************/
791		812
792	#define PRIO_MAX 3	813	#define PRIO_MAX 3
…		…
796	#define PRIO_IDLE -3	817	#define PRIO_IDLE -3
797	#define PRIO_MIN -4	818	#define PRIO_MIN -4
798		819
799	/* for Coro.pm */	820	/* for Coro.pm */
800	static GV *coro_current, *coro_idle;	821	static GV *coro_current, *coro_idle;
801	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	822	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
802	static int coro_nready;	823	static int coro_nready;
803		824
804	static void	825	static void
805	coro_enq (SV *sv)	826	coro_enq (pTHX_ SV *sv)
806	{	827	{
807	if (SvROK (sv))	828	int prio;
808	{	829
809	SV *hv = SvRV (sv);
810	if (SvTYPE (hv) == SVt_PVHV)	830	if (SvTYPE (sv) != SVt_PVHV)
811	{
812	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
813	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
814
815	prio = prio > PRIO_MAX ? PRIO_MAX
816	: prio < PRIO_MIN ? PRIO_MIN
817	: prio;
818
819	av_push (coro_ready [prio - PRIO_MIN], sv);
820	coro_nready++;
821
822	return;
823	}
824	}
825
826	croak ("Coro::ready tried to enqueue something that is not a coroutine");	831	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		832
		833	prio = SvSTATE (sv)->prio;
		834
		835	av_push (coro_ready [prio - PRIO_MIN], sv);
		836	coro_nready++;
827	}	837	}
828		838
829	static SV *	839	static SV *
830	coro_deq (int min_prio)	840	coro_deq (pTHX_ int min_prio)
831	{	841	{
832	int prio = PRIO_MAX - PRIO_MIN;	842	int prio = PRIO_MAX - PRIO_MIN;
833		843
834	min_prio -= PRIO_MIN;	844	min_prio -= PRIO_MIN;
835	if (min_prio < 0)	845	if (min_prio < 0)
836	min_prio = 0;	846	min_prio = 0;
837		847
838	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	848	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
839	if (av_len (coro_ready[prio]) >= 0)	849	if (AvFILLp (coro_ready [prio]) >= 0)
840	{	850	{
841	coro_nready--;	851	coro_nready--;
842	return av_shift (coro_ready[prio]);	852	return av_shift (coro_ready [prio]);
843	}	853	}
844		854
845	return 0;	855	return 0;
846	}	856	}
847		857
848	static void	858	static void
849	api_ready (SV *coro)	859	api_ready (SV *coro)
850	{	860	{
		861	dTHX;
		862
		863	if (SvROK (coro))
		864	coro = SvRV (coro);
		865
		866	LOCK;
851	coro_enq (SvREFCNT_inc (coro));	867	coro_enq (aTHX_ SvREFCNT_inc (coro));
		868	UNLOCK;
852	}	869	}
853		870
854	static void	871	static void
855	api_schedule (int cede)	872	api_schedule (void)
856	{	873	{
		874	dTHX;
		875
857	SV *prev, *next;	876	SV *prev, *next;
858
859	prev = GvSV (coro_current);	877	SV *current = GvSV (coro_current);
860		878
861	if (cede)	879	for (;;)
862	coro_enq (SvREFCNT_inc (prev));	880	{
		881	LOCK;
863		882
864	next = coro_deq (PRIO_MIN);	883	next = coro_deq (aTHX_ PRIO_MIN);
865		884
866	if (!next)	885	if (next)
867	next = SvREFCNT_inc (GvSV (coro_idle));	886	break;
868		887
869	GvSV (coro_current) = SvREFCNT_inc (next);	888	UNLOCK;
870	transfer (aTHX_	889
871	sv_to_coro (prev, "Coro::schedule", "current coroutine"),	890	{
872	sv_to_coro (next, "Coro::schedule", "next coroutine"),	891	dSP;
873	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	892
874	SvREFCNT_dec (next);	893	ENTER;
875	SvREFCNT_dec (prev);	894	SAVETMPS;
		895
		896	PUSHMARK (SP);
		897	PUTBACK;
		898	call_sv (GvSV (coro_idle), G_DISCARD);
		899
		900	FREETMPS;
		901	LEAVE;
		902	}
		903	}
		904
		905	prev = SvRV (current);
		906	SvRV (current) = next;
		907
		908	/* free this only after the transfer */
		909	coro_mortal = prev;
		910
		911	UNLOCK;
		912
		913	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), TRANSFER_SAVE_ALL);
		914	}
		915
		916	static int coro_cede_self;
		917
		918	static void
		919	api_cede (void)
		920	{
		921	dTHX;
		922	SV *current = SvREFCNT_inc (SvRV (GvSV (coro_current)));
		923
		924	LOCK;
		925
		926	if (coro_cede_self)
		927	{
		928	AV *runqueue = coro_ready [PRIO_MAX - PRIO_MIN];
		929	av_unshift (runqueue, 1);
		930	av_store (runqueue, 0, current);
		931	coro_nready++;
		932	coro_cede_self = 0;
		933	}
		934	else
		935	coro_enq (aTHX_ current);
		936
		937	UNLOCK;
		938
		939	api_schedule ();
876	}	940	}
877		941
878	MODULE = Coro::State PACKAGE = Coro::State	942	MODULE = Coro::State PACKAGE = Coro::State
879		943
880	PROTOTYPES: ENABLE	944	PROTOTYPES: DISABLE
881		945
882	BOOT:	946	BOOT:
883	{ /* {} necessary for stoopid perl-5.6.x */	947	{
884	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	948	#ifdef USE_ITHREADS
885	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	949	MUTEX_INIT (&coro_mutex);
		950	#endif
		951	BOOT_PAGESIZE;
		952
886	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	953	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
887		954
888	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	955	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
889	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	956	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
890	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	957	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
891	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
892
893	if (!padlist_cache)
894	padlist_cache = newHV ();
895		958
896	main_mainstack = PL_mainstack;	959	main_mainstack = PL_mainstack;
897		960
898	coroapi.ver = CORO_API_VERSION;	961	coroapi.ver = CORO_API_VERSION;
899	coroapi.transfer = api_transfer;	962	coroapi.transfer = api_transfer;
900	}
901		963
902	Coro::State	964	Newz (0, main_stack, 1, coro_stack);
903	_newprocess(args)	965	main_stack->idle_sp = (void *)-1;
904	SV * args	966
905	PROTOTYPE: $	967	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		968	}
		969
		970	SV *
		971	new (char *klass, ...)
906	CODE:	972	CODE:
907	Coro__State coro;	973	{
		974	struct coro *coro;
		975	HV *hv;
		976	int i;
908		977
909	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
910	croak ("Coro::State::_newprocess expects an arrayref");
911
912	New (0, coro, 1, struct coro);	978	Newz (0, coro, 1, struct coro);
		979	coro->args = newAV ();
913		980
914	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	981	hv = newHV ();
		982	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		983	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		984
		985	av_push (coro->args, newSVsv (RETVAL));
		986	for (i = 1; i < items; i++)
		987	av_push (coro->args, newSVsv (ST (i)));
		988
		989	coro->stack = main_stack;
915	coro->mainstack = 0; /* actual work is done inside transfer */	990	/*coro->mainstack = 0; *//*actual work is done inside transfer */
916	coro->stack = 0;	991	/*coro->stack = 0;*/
917		992	}
918	RETVAL = coro;
919	OUTPUT:	993	OUTPUT:
920	RETVAL	994	RETVAL
921		995
922	void	996	void
923	transfer(prev, next, flags)	997	transfer (prev, next, flags)
924	Coro::State_or_hashref prev	998	SV *prev
925	Coro::State_or_hashref next	999	SV *next
926	int flags	1000	int flags
927	PROTOTYPE: @
928	CODE:	1001	CODE:
929	PUTBACK;	1002	PUTBACK;
930	transfer (aTHX_ prev, next, flags);	1003	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);
931	SPAGAIN;	1004	SPAGAIN;
932		1005
		1006	int
		1007	prio (Coro::State coro, int newprio = 0)
		1008	ALIAS:
		1009	nice = 1
		1010	CODE:
		1011	{
		1012	RETVAL = coro->prio;
		1013
		1014	if (items > 1)
		1015	{
		1016	if (ix)
		1017	newprio += coro->prio;
		1018
		1019	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1020	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1021
		1022	coro->prio = newprio;
		1023	}
		1024	}
		1025
933	void	1026	void
934	DESTROY(coro)	1027	_clear_idle_sp (Coro::State self)
935	Coro::State coro	1028	CODE:
936	CODE:	1029	self->stack->idle_sp = 0;
937
938	if (coro->mainstack && coro->mainstack != main_mainstack)
939	{
940	struct coro temp;
941
942	PUTBACK;
943	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);
944	LOAD(aTHX_ coro);
945	SPAGAIN;
946
947	destroy_stacks (aTHX);
948
949	LOAD((&temp)); /* this will get rid of defsv etc.. */
950	SPAGAIN;
951
952	coro->mainstack = 0;
953	}
954
955	deallocate_stack (coro);
956
957	Safefree (coro);
958		1030
959	void	1031	void
960	flush()	1032	_clone_state_from (SV *dst, SV *src)
961	CODE:	1033	CODE:
962	#ifdef MAY_FLUSH	1034	{
963	flush_padlist_cache ();	1035	struct coro *coro_src = SvSTATE (src);
964	#endif	1036
		1037	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1038
		1039	++coro_src->refcnt;
		1040	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1041	}
965		1042
966	void	1043	void
967	_exit(code)	1044	_exit (code)
968	int code	1045	int code
969	PROTOTYPE: $	1046	PROTOTYPE: $
970	CODE:	1047	CODE:
971	#if defined(__GLIBC__) || _POSIX_C_SOURCE
972	_exit (code);	1048	_exit (code);
973	#else
974	signal (SIGTERM, SIG_DFL);
975	raise (SIGTERM);
976	exit (code);
977	#endif
978		1049
979	MODULE = Coro::State PACKAGE = Coro::Cont	1050	MODULE = Coro::State PACKAGE = Coro::Cont
980		1051
981	# this is slightly dirty (should expose a c-level api)
982
983	void	1052	void
984	yield(...)	1053	yield (...)
985	PROTOTYPE: @	1054	PROTOTYPE: @
986	CODE:	1055	CODE:
987	static SV *returnstk;	1056	{
		1057	SV *yieldstack;
988	SV *sv;	1058	SV *sv;
989	AV *defav = GvAV (PL_defgv);	1059	AV *defav = GvAV (PL_defgv);
990	struct coro *prev, *next;	1060	struct coro *prev, *next;
991		1061
992	if (!returnstk)	1062	yieldstack = *hv_fetch (
993	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1063	(HV *)SvRV (GvSV (coro_current)),
		1064	"yieldstack", sizeof ("yieldstack") - 1,
		1065	0
		1066	);
994		1067
995	/* set up @_ -- ugly */	1068	/* set up @_ -- ugly */
996	av_clear (defav);	1069	av_clear (defav);
997	av_fill (defav, items - 1);	1070	av_fill (defav, items - 1);
998	while (items--)	1071	while (items--)
999	av_store (defav, items, SvREFCNT_inc (ST(items)));	1072	av_store (defav, items, SvREFCNT_inc (ST(items)));
1000		1073
1001	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1002	sv = av_pop ((AV *)SvRV (returnstk));	1074	sv = av_pop ((AV *)SvRV (yieldstack));
1003	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));	1075	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1004	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));	1076	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1005	SvREFCNT_dec (sv);	1077	SvREFCNT_dec (sv);
1006		1078
1007	transfer(aTHX_ prev, next, 0);	1079	coro_state_transfer (aTHX_ prev, next, 0);
		1080	}
1008		1081
1009	MODULE = Coro::State PACKAGE = Coro	1082	MODULE = Coro::State PACKAGE = Coro
1010		1083
1011	# this is slightly dirty (should expose a c-level api)
1012
1013	BOOT:	1084	BOOT:
1014	{	1085	{
1015	int i;	1086	int i;
		1087
1016	HV *stash = gv_stashpv ("Coro", TRUE);	1088	coro_stash = gv_stashpv ("Coro", TRUE);
1017		1089
1018	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1090	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1019	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1091	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1020	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1092	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1021	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1093	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1022	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1094	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1023	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1095	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1024		1096
1025	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1097	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1026	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1098	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1027		1099
1028	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1100	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1030		1102
1031	{	1103	{
1032	SV *sv = perl_get_sv("Coro::API", 1);	1104	SV *sv = perl_get_sv("Coro::API", 1);
1033		1105
1034	coroapi.schedule = api_schedule;	1106	coroapi.schedule = api_schedule;
		1107	coroapi.cede = api_cede;
1035	coroapi.ready = api_ready;	1108	coroapi.ready = api_ready;
1036	coroapi.nready = &coro_nready;	1109	coroapi.nready = &coro_nready;
1037	coroapi.current = coro_current;	1110	coroapi.current = coro_current;
1038		1111
1039	GCoroAPI = &coroapi;	1112	GCoroAPI = &coroapi;
1040	sv_setiv(sv, (IV)&coroapi);	1113	sv_setiv (sv, (IV)&coroapi);
1041	SvREADONLY_on(sv);	1114	SvREADONLY_on (sv);
1042	}	1115	}
1043	}	1116	}
1044		1117
1045	void	1118	void
1046	ready(self)	1119	ready (SV *self)
1047	SV * self
1048	PROTOTYPE: $	1120	PROTOTYPE: $
1049	CODE:	1121	CODE:
1050	api_ready (self);	1122	api_ready (self);
1051		1123
1052	int	1124	int
1053	nready(...)	1125	nready (...)
1054	PROTOTYPE:	1126	PROTOTYPE:
1055	CODE:	1127	CODE:
1056	RETVAL = coro_nready;	1128	RETVAL = coro_nready;
1057	OUTPUT:	1129	OUTPUT:
1058	RETVAL	1130	RETVAL
1059		1131
1060	void	1132	void
1061	schedule(...)	1133	schedule (...)
1062	PROTOTYPE:	1134	PROTOTYPE:
1063	ALIAS:
1064	cede = 1
1065	CODE:	1135	CODE:
1066	api_schedule (ix);	1136	api_schedule ();
1067		1137
		1138	void
		1139	_set_cede_self ()
		1140	CODE:
		1141	coro_cede_self = 1;
		1142
		1143	void
		1144	cede (...)
		1145	PROTOTYPE:
		1146	CODE:
		1147	api_cede ();
		1148
		1149	MODULE = Coro::State PACKAGE = Coro::AIO
		1150
		1151	SV *
		1152	_get_state ()
		1153	CODE:
		1154	{
		1155	struct {
		1156	int errorno;
		1157	int laststype;
		1158	int laststatval;
		1159	Stat_t statcache;
		1160	} data;
		1161
		1162	data.errorno = errno;
		1163	data.laststype = PL_laststype;
		1164	data.laststatval = PL_laststatval;
		1165	data.statcache = PL_statcache;
		1166
		1167	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1168	}
		1169	OUTPUT:
		1170	RETVAL
		1171
		1172	void
		1173	_set_state (char *data_)
		1174	PROTOTYPE: $
		1175	CODE:
		1176	{
		1177	struct {
		1178	int errorno;
		1179	int laststype;
		1180	int laststatval;
		1181	Stat_t statcache;
		1182	} *data = (void *)data_;
		1183
		1184	errno = data->errorno;
		1185	PL_laststype = data->laststype;
		1186	PL_laststatval = data->laststatval;
		1187	PL_statcache = data->statcache;
		1188	}

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