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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.15 by root, Wed Jul 25 04:14:38 2001 UTC vs.
Revision 1.96 by root, Sun Nov 26 18:25:11 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"
		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
		32	#include <stdio.h>
		33	#include <errno.h>
		34
		35	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		36	# undef STACKGUARD
		37	#endif
		38
		39	#ifndef STACKGUARD
		40	# define STACKGUARD 0
		41	#endif
6		42
7	#ifdef HAVE_MMAP	43	#ifdef HAVE_MMAP
8	# include <unistd.h>	44	# include <unistd.h>
9	# include <sys/mman.h>	45	# include <sys/mman.h>
		46	# ifndef MAP_ANONYMOUS
		47	# ifdef MAP_ANON
		48	# define MAP_ANONYMOUS MAP_ANON
		49	# else
		50	# undef HAVE_MMAP
		51	# endif
10	#endif	52	# endif
		53	# include <limits.h>
		54	# ifndef PAGESIZE
		55	# define PAGESIZE pagesize
		56	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		57	static long pagesize;
		58	# else
		59	# define BOOT_PAGESIZE
		60	# endif
		61	#endif
11		62
12	#define MAY_FLUSH /* increases codesize */	63	/* The next macro should declare a variable stacklevel that contains and approximation
		64	* to the current C stack pointer. Its property is that it changes with each call
		65	* and should be unique. */
		66	#define dSTACKLEVEL int stacklevel
		67	#define STACKLEVEL ((void *)&stacklevel)
13		68
14	/* perl-related */	69	#define IN_DESTRUCT (PL_main_cv == Nullcv)
15	#define TRANSFER_SAVE_DEFAV 0x00000001	70
16	#define TRANSFER_SAVE_DEFSV 0x00000002	71	#include "CoroAPI.h"
17	#define TRANSFER_SAVE_ERRSV 0x00000004	72
18	/* c-related */	73	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
19	#define TRANSFER_SAVE_CCTXT 0x00000008	74
20	#ifdef CORO_LAZY_STACK	75	#ifdef USE_ITHREADS
21	# define TRANSFER_LAZY_STACK 0x00000010	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)
22	#else	79	#else
23	# define TRANSFER_LAZY_STACK 0x00000000	80	# define LOCK (void)0
		81	# define UNLOCK (void)0
24	#endif	82	#endif
25		83
26	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	84	static struct CoroAPI coroapi;
27	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	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 */
28		88
29	#define SUB_INIT "Coro::State::initialize"	89	/* this is a structure representing a c-level coroutine */
30	#define UCORO_STATE "_coro_state"	90	typedef struct coro_stack {
		91	struct coro_stack *next;
31		92
32	/* The next macro should delcare a variable stacklevel that contains and approximation	93	/* the stack */
33	* to the current C stack pointer. It's property is that it changes with each call
34	* and should be unique. */
35	#define dSTACKLEVEL void *stacklevel = &stacklevel
36
37	#define labs(l) ((l) >= 0 ? (l) : -(l))
38
39	/* this is actually not only the c stack but also c registers etc... */
40	typedef struct {
41	int refcnt; /* pointer reference counter */
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44
45	coro_context cctx;
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	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		99	JMPENV *top_env;
		100	coro_context cctx;
49	} coro_stack;	101	} coro_stack;
50		102
51	static coro_stack main_stack = { 1, 0, 0 };	103	/* this is a structure representing a perl-level coroutine */
52
53	struct coro {	104	struct coro {
54	/* the optional C context */	105	/* the c coroutine allocated to this perl coroutine, if any */
55	coro_stack *stack;	106	coro_stack *stack;
56	void *cursp;	107
		108	/* data associated with this coroutine (initial args) */
		109	AV *args;
57	int gencnt;	110	int refcnt;
58		111
59	/* optionally saved, might be zero */	112	/* optionally saved, might be zero */
60	AV *defav;	113	AV *defav;
61	SV *defsv;	114	SV *defsv;
62	SV *errsv;	115	SV *errsv;
63		116
64	/* saved global state not related to stacks */	117	/* saved global state not related to stacks */
65	U8 dowarn;	118	U8 dowarn;
		119	I32 in_eval;
66		120
67	/* the stacks and related info (callchain etc..) */	121	/* the stacks and related info (callchain etc..) */
68	PERL_SI *curstackinfo;	122	PERL_SI *curstackinfo;
69	AV *curstack;	123	AV *curstack;
70	AV *mainstack;	124	AV *mainstack;
71	SV **stack_sp;	125	SV **stack_sp;
72	OP *op;	126	OP *op;
73	SV **curpad;	127	SV **curpad;
		128	AV *comppad;
		129	CV *compcv;
74	SV **stack_base;	130	SV **stack_base;
75	SV **stack_max;	131	SV **stack_max;
76	SV **tmps_stack;	132	SV **tmps_stack;
77	I32 tmps_floor;	133	I32 tmps_floor;
78	I32 tmps_ix;	134	I32 tmps_ix;
…		…
87	I32 savestack_ix;	143	I32 savestack_ix;
88	I32 savestack_max;	144	I32 savestack_max;
89	OP **retstack;	145	OP **retstack;
90	I32 retstack_ix;	146	I32 retstack_ix;
91	I32 retstack_max;	147	I32 retstack_max;
		148	PMOP *curpm;
92	COP *curcop;	149	COP *curcop;
93	JMPENV start_env;
94	JMPENV *top_env;
95		150
96	/* data associated with this coroutine (initial args) */	151	/* coro process data */
97	AV *args;	152	int prio;
98	};	153	};
99		154
100	typedef struct coro *Coro__State;	155	typedef struct coro *Coro__State;
101	typedef struct coro *Coro__State_or_hashref;	156	typedef struct coro *Coro__State_or_hashref;
102		157
103	static AV *main_mainstack; /* used to differentiate between $main and others */	158	static AV *
104	static HV *coro_state_stash;	159	coro_clone_padlist (pTHX_ CV *cv)
105	static SV *ucoro_state_sv;
106	static U32 ucoro_state_hash;
107	static HV *padlist_cache;
108
109	/* mostly copied from op.c:cv_clone2 */
110	STATIC AV *
111	clone_padlist (AV *protopadlist)
112	{	160	{
113	AV *av;	161	AV *padlist = CvPADLIST (cv);
114	I32 ix;
115	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
116	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
117	SV **pname = AvARRAY (protopad_name);
118	SV **ppad = AvARRAY (protopad);
119	I32 fname = AvFILLp (protopad_name);
120	I32 fpad = AvFILLp (protopad);
121	AV *newpadlist, *newpad_name, *newpad;	162	AV *newpadlist, *newpad;
122	SV **npad;
123
124	newpad_name = newAV ();
125	for (ix = fname; ix >= 0; ix--)
126	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
127
128	newpad = newAV ();
129	av_fill (newpad, AvFILLp (protopad));
130	npad = AvARRAY (newpad);
131		163
132	newpadlist = newAV ();	164	newpadlist = newAV ();
133	AvREAL_off (newpadlist);	165	AvREAL_off (newpadlist);
134	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)));
135	av_store (newpadlist, 1, (SV *) newpad);	175	av_store (newpadlist, 1, (SV *)newpad);
136		176
137	av = newAV (); /* will be @_ */	177	return newpadlist;
138	av_extend (av, 0);	178	}
139	av_store (newpad, 0, (SV *) av);
140	AvFLAGS (av) = AVf_REIFY;
141		179
142	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))
143	{	185	{
144	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	186	I32 i = AvFILLp (padlist);
145	if (namesv && namesv != &PL_sv_undef)	187	while (i >= 0)
146	{	188	{
147	char *name = SvPVX (namesv); /* XXX */	189	SV **svp = av_fetch (padlist, i--, FALSE);
148	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	190	if (svp)
149	{ /* lexical from outside? */
150	npad[ix] = SvREFCNT_inc (ppad[ix]);
151	}	191	{
152	else
153	{ /* our own lexical */
154	SV *sv;	192	SV *sv;
155	if (*name == '&')	193	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
156	sv = SvREFCNT_inc (ppad[ix]);	194	SvREFCNT_dec (sv);
157	else if (*name == '@')	195
158	sv = (SV *) newAV ();	196	SvREFCNT_dec (*svp);
159	else if (*name == '%')
160	sv = (SV *) newHV ();
161	else
162	sv = NEWSV (0, 0);
163	if (!SvPADBUSY (sv))
164	SvPADMY_on (sv);
165	npad[ix] = sv;
166	}	197	}
167	}	198	}
168	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	199
169	{	200	SvREFCNT_dec ((SV*)padlist);
170	npad[ix] = SvREFCNT_inc (ppad[ix]);
171	}
172	else
173	{
174	SV *sv = NEWSV (0, 0);
175	SvPADTMP_on (sv);
176	npad[ix] = sv;
177	}
178	}	201	}
		202	}
179		203
180	#if 0 /* return -ENOTUNDERSTOOD */	204	static int
181	/* 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;
182		209
183	for (ix = fpad; ix > 0; ix--) {	210	/* casting is fun. */
184	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	211	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
185	if (namesv	212	free_padlist (aTHX_ padlist);
186	&& namesv != &PL_sv_undef	213
187	&& !(SvFLAGS(namesv) & SVf_FAKE)	214	SvREFCNT_dec (av);
188	&& *SvPVX(namesv) == '&'	215
189	&& CvCLONE(ppad[ix]))	216	return 0;
190	{	217	}
191	CV *kid = cv_clone((CV*)ppad[ix]);	218
192	SvREFCNT_dec(ppad[ix]);	219	#define PERL_MAGIC_coro PERL_MAGIC_ext
193	CvCLONE_on(kid);	220
194	SvPADMY_on(kid);	221	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
195	npad[ix] = (SV*)kid;	222
196	}	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 is probably cleaner, but also slower? */
		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 ();
197	}	256	}
198	#endif
199		257
200	return newpadlist;
201	}
202
203	#ifdef MAY_FLUSH
204	STATIC AV *
205	free_padlist (AV *padlist)
206	{
207	/* may be during global destruction */
208	if (SvREFCNT(padlist))
209	{
210	I32 i = AvFILLp(padlist);
211	while (i >= 0)
212	{
213	SV **svp = av_fetch(padlist, i--, FALSE);
214	SV *sv = svp ? *svp : Nullsv;
215	if (sv)
216	SvREFCNT_dec(sv);
217	}
218
219	SvREFCNT_dec((SV*)padlist);
220	}
221	}
222	#endif
223
224	/* the next two functions merely cache the padlists */
225	STATIC void
226	get_padlist (CV *cv)
227	{
228	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
229
230	if (he && AvFILLp ((AV *)*he) >= 0)
231	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
232	else
233	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
234	}
235
236	STATIC void
237	put_padlist (CV *cv)
238	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
240
241	if (SvTYPE (*he) != SVt_PVAV)
242	{
243	SvREFCNT_dec (*he);
244	*he = (SV *)newAV ();
245	}
246
247	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	258	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
248	}	259	}
249
250	#ifdef MAY_FLUSH
251	STATIC void
252	flush_padlist_cache ()
253	{
254	HV *hv = padlist_cache;
255	padlist_cache = newHV ();
256
257	if (hv_iterinit (hv))
258	{
259	HE *he;
260	AV *padlist;
261
262	while (!!(he = hv_iternext (hv)))
263	{
264	AV *av = (AV *)HeVAL(he);
265
266	/* casting is fun. */
267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
268	free_padlist (padlist);
269	}
270	}
271
272	SvREFCNT_dec (hv);
273	}
274	#endif
275		260
276	#define SB do {	261	#define SB do {
277	#define SE } while (0)	262	#define SE } while (0)
278		263
279	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	264	#define LOAD(state) load_state(aTHX_ (state));
280	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	265	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
281		266
282	#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
283		268
284	static void	269	static void
285	load_state(pTHX_ Coro__State c)	270	load_state(pTHX_ Coro__State c)
286	{	271	{
287	PL_dowarn = c->dowarn;	272	PL_dowarn = c->dowarn;
		273	PL_in_eval = c->in_eval;
288		274
289	PL_curstackinfo = c->curstackinfo;	275	PL_curstackinfo = c->curstackinfo;
290	PL_curstack = c->curstack;	276	PL_curstack = c->curstack;
291	PL_mainstack = c->mainstack;	277	PL_mainstack = c->mainstack;
292	PL_stack_sp = c->stack_sp;	278	PL_stack_sp = c->stack_sp;
293	PL_op = c->op;	279	PL_op = c->op;
294	PL_curpad = c->curpad;	280	PL_curpad = c->curpad;
		281	PL_comppad = c->comppad;
		282	PL_compcv = c->compcv;
295	PL_stack_base = c->stack_base;	283	PL_stack_base = c->stack_base;
296	PL_stack_max = c->stack_max;	284	PL_stack_max = c->stack_max;
297	PL_tmps_stack = c->tmps_stack;	285	PL_tmps_stack = c->tmps_stack;
298	PL_tmps_floor = c->tmps_floor;	286	PL_tmps_floor = c->tmps_floor;
299	PL_tmps_ix = c->tmps_ix;	287	PL_tmps_ix = c->tmps_ix;
…		…
305	PL_scopestack_ix = c->scopestack_ix;	293	PL_scopestack_ix = c->scopestack_ix;
306	PL_scopestack_max = c->scopestack_max;	294	PL_scopestack_max = c->scopestack_max;
307	PL_savestack = c->savestack;	295	PL_savestack = c->savestack;
308	PL_savestack_ix = c->savestack_ix;	296	PL_savestack_ix = c->savestack_ix;
309	PL_savestack_max = c->savestack_max;	297	PL_savestack_max = c->savestack_max;
		298	#if PERL_VERSION < 9
310	PL_retstack = c->retstack;	299	PL_retstack = c->retstack;
311	PL_retstack_ix = c->retstack_ix;	300	PL_retstack_ix = c->retstack_ix;
312	PL_retstack_max = c->retstack_max;	301	PL_retstack_max = c->retstack_max;
		302	#endif
		303	PL_curpm = c->curpm;
313	PL_curcop = c->curcop;	304	PL_curcop = c->curcop;
314	PL_start_env = c->start_env;
315	PL_top_env = c->top_env;
316		305
317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	306	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	307	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	308	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
320		309
…		…
327	{	316	{
328	AV *padlist = (AV *)POPs;	317	AV *padlist = (AV *)POPs;
329		318
330	if (padlist)	319	if (padlist)
331	{	320	{
332	put_padlist (cv); /* mark this padlist as available */	321	put_padlist (aTHX_ cv); /* mark this padlist as available */
333	CvPADLIST(cv) = padlist;	322	CvPADLIST(cv) = padlist;
334	#ifdef USE_THREADS
335	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
336	#endif
337	}	323	}
338		324
339	++CvDEPTH(cv);	325	++CvDEPTH(cv);
340	}	326	}
341		327
…		…
359		345
360	PUSHs (Nullsv);	346	PUSHs (Nullsv);
361	/* this loop was inspired by pp_caller */	347	/* this loop was inspired by pp_caller */
362	for (;;)	348	for (;;)
363	{	349	{
364	do	350	while (cxix >= 0)
365	{	351	{
366	PERL_CONTEXT *cx = &ccstk[cxix--];	352	PERL_CONTEXT *cx = &ccstk[cxix--];
367		353
368	if (CxTYPE(cx) == CXt_SUB)	354	if (CxTYPE(cx) == CXt_SUB)
369	{	355	{
370	CV *cv = cx->blk_sub.cv;	356	CV *cv = cx->blk_sub.cv;
371	if (CvDEPTH(cv))	357	if (CvDEPTH(cv))
372	{	358	{
373	#ifdef USE_THREADS
374	/*XPUSHs ((SV *)CvOWNER(cv));*/
375	/*CvOWNER(cv) = 0;*/
376	/*error must unlock this cv etc.. etc...*/
377	#endif
378	EXTEND (SP, CvDEPTH(cv)*2);	359	EXTEND (SP, CvDEPTH(cv)*2);
379		360
380	while (--CvDEPTH(cv))	361	while (--CvDEPTH(cv))
381	{	362	{
382	/* this tells the restore code to increment CvDEPTH */	363	/* this tells the restore code to increment CvDEPTH */
…		…
385	}	366	}
386		367
387	PUSHs ((SV *)CvPADLIST(cv));	368	PUSHs ((SV *)CvPADLIST(cv));
388	PUSHs ((SV *)cv);	369	PUSHs ((SV *)cv);
389		370
390	get_padlist (cv); /* this is a monster */	371	get_padlist (aTHX_ cv);
391	}	372	}
392	}	373	}
		374	#ifdef CXt_FORMAT
393	else if (CxTYPE(cx) == CXt_FORMAT)	375	else if (CxTYPE(cx) == CXt_FORMAT)
394	{	376	{
395	/* I never used formats, so how should I know how these are implemented? */	377	/* I never used formats, so how should I know how these are implemented? */
396	/* my bold guess is as a simple, plain sub... */	378	/* my bold guess is as a simple, plain sub... */
397	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
398	}	380	}
		381	#endif
399	}	382	}
400	while (cxix >= 0);
401		383
402	if (top_si->si_type == PERLSI_MAIN)	384	if (top_si->si_type == PERLSI_MAIN)
403	break;	385	break;
404		386
405	top_si = top_si->si_prev;	387	top_si = top_si->si_prev;
…		…
412		394
413	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	395	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
414	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	396	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
415	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	397	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
416		398
417	/* I have not the slightest idea of why av_reify is necessary */
418	/* but if it's missing the defav contents magically get replaced sometimes */
419	if (c->defav)
420	av_reify (c->defav);
421
422	c->dowarn = PL_dowarn;	399	c->dowarn = PL_dowarn;
		400	c->in_eval = PL_in_eval;
423		401
424	c->curstackinfo = PL_curstackinfo;	402	c->curstackinfo = PL_curstackinfo;
425	c->curstack = PL_curstack;	403	c->curstack = PL_curstack;
426	c->mainstack = PL_mainstack;	404	c->mainstack = PL_mainstack;
427	c->stack_sp = PL_stack_sp;	405	c->stack_sp = PL_stack_sp;
428	c->op = PL_op;	406	c->op = PL_op;
429	c->curpad = PL_curpad;	407	c->curpad = PL_curpad;
		408	c->comppad = PL_comppad;
		409	c->compcv = PL_compcv;
430	c->stack_base = PL_stack_base;	410	c->stack_base = PL_stack_base;
431	c->stack_max = PL_stack_max;	411	c->stack_max = PL_stack_max;
432	c->tmps_stack = PL_tmps_stack;	412	c->tmps_stack = PL_tmps_stack;
433	c->tmps_floor = PL_tmps_floor;	413	c->tmps_floor = PL_tmps_floor;
434	c->tmps_ix = PL_tmps_ix;	414	c->tmps_ix = PL_tmps_ix;
…		…
440	c->scopestack_ix = PL_scopestack_ix;	420	c->scopestack_ix = PL_scopestack_ix;
441	c->scopestack_max = PL_scopestack_max;	421	c->scopestack_max = PL_scopestack_max;
442	c->savestack = PL_savestack;	422	c->savestack = PL_savestack;
443	c->savestack_ix = PL_savestack_ix;	423	c->savestack_ix = PL_savestack_ix;
444	c->savestack_max = PL_savestack_max;	424	c->savestack_max = PL_savestack_max;
		425	#if PERL_VERSION < 9
445	c->retstack = PL_retstack;	426	c->retstack = PL_retstack;
446	c->retstack_ix = PL_retstack_ix;	427	c->retstack_ix = PL_retstack_ix;
447	c->retstack_max = PL_retstack_max;	428	c->retstack_max = PL_retstack_max;
		429	#endif
		430	c->curpm = PL_curpm;
448	c->curcop = PL_curcop;	431	c->curcop = PL_curcop;
449	c->start_env = PL_start_env;
450	c->top_env = PL_top_env;
451	}	432	}
452		433
453	/*	434	/*
454	* allocate various perl stacks. This is an exact copy	435	* allocate various perl stacks. This is an exact copy
455	* of perl.c:init_stacks, except that it uses less memory	436	* of perl.c:init_stacks, except that it uses less memory
456	* on the assumption that coroutines do not usually need	437	* on the (sometimes correct) assumption that coroutines do
457	* a lot of stackspace.	438	* not usually need a lot of stackspace.
458	*/	439	*/
459	STATIC void	440	static void
460	coro_init_stacks (pTHX)	441	coro_init_stacks (pTHX)
461	{	442	{
		443	LOCK;
		444
462	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	445	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
463	PL_curstackinfo->si_type = PERLSI_MAIN;	446	PL_curstackinfo->si_type = PERLSI_MAIN;
464	PL_curstack = PL_curstackinfo->si_stack;	447	PL_curstack = PL_curstackinfo->si_stack;
465	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	448	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
466		449
…		…
475		458
476	New(54,PL_markstack,16,I32);	459	New(54,PL_markstack,16,I32);
477	PL_markstack_ptr = PL_markstack;	460	PL_markstack_ptr = PL_markstack;
478	PL_markstack_max = PL_markstack + 16;	461	PL_markstack_max = PL_markstack + 16;
479		462
		463	#ifdef SET_MARK_OFFSET
480	SET_MARK_OFFSET;	464	SET_MARK_OFFSET;
		465	#endif
481		466
482	New(54,PL_scopestack,16,I32);	467	New(54,PL_scopestack,16,I32);
483	PL_scopestack_ix = 0;	468	PL_scopestack_ix = 0;
484	PL_scopestack_max = 16;	469	PL_scopestack_max = 16;
485		470
486	New(54,PL_savestack,96,ANY);	471	New(54,PL_savestack,96,ANY);
487	PL_savestack_ix = 0;	472	PL_savestack_ix = 0;
488	PL_savestack_max = 96;	473	PL_savestack_max = 96;
489		474
		475	#if PERL_VERSION < 9
490	New(54,PL_retstack,8,OP*);	476	New(54,PL_retstack,8,OP*);
491	PL_retstack_ix = 0;	477	PL_retstack_ix = 0;
492	PL_retstack_max = 8;	478	PL_retstack_max = 8;
		479	#endif
		480
		481	UNLOCK;
493	}	482	}
494		483
495	/*	484	/*
496	* destroy the stacks, the callchain etc...	485	* destroy the stacks, the callchain etc...
497	* still there is a memleak of 128 bytes...
498	*/	486	*/
499	STATIC void	487	static void
500	destroy_stacks(pTHX)	488	destroy_stacks(pTHX)
501	{	489	{
		490	if (!IN_DESTRUCT)
		491	{
502	/* is this ugly, I ask? */	492	/* is this ugly, I ask? */
503	while (PL_scopestack_ix)	493	LEAVE_SCOPE (0);
504	LEAVE;
505		494
506	/* sure it is, but more important: is it correct?? :/ */	495	/* sure it is, but more important: is it correct?? :/ */
507	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
508	FREETMPS;	496	FREETMPS;
		497
		498	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		499	}
509		500
510	while (PL_curstackinfo->si_next)	501	while (PL_curstackinfo->si_next)
511	PL_curstackinfo = PL_curstackinfo->si_next;	502	PL_curstackinfo = PL_curstackinfo->si_next;
512		503
513	while (PL_curstackinfo)	504	while (PL_curstackinfo)
514	{	505	{
515	PERL_SI *p = PL_curstackinfo->si_prev;	506	PERL_SI *p = PL_curstackinfo->si_prev;
516		507
517	{	508	{ /*D*//*remove*/
518	dSP;	509	dSP;
519	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	510	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
520	PUTBACK; /* possibly superfluous */	511	PUTBACK; /* possibly superfluous */
521	}	512	}
522		513
523	dounwind(-1);	514	if (!IN_DESTRUCT)
524		515	{
		516	dounwind (-1);/*D*//*remove*/
525	SvREFCNT_dec(PL_curstackinfo->si_stack);	517	SvREFCNT_dec (PL_curstackinfo->si_stack);
		518	}
		519
526	Safefree(PL_curstackinfo->si_cxstack);	520	Safefree (PL_curstackinfo->si_cxstack);
527	Safefree(PL_curstackinfo);	521	Safefree (PL_curstackinfo);
528	PL_curstackinfo = p;	522	PL_curstackinfo = p;
529	}	523	}
530		524
531	Safefree(PL_tmps_stack);	525	Safefree (PL_tmps_stack);
532	Safefree(PL_markstack);	526	Safefree (PL_markstack);
533	Safefree(PL_scopestack);	527	Safefree (PL_scopestack);
534	Safefree(PL_savestack);	528	Safefree (PL_savestack);
		529	#if PERL_VERSION < 9
535	Safefree(PL_retstack);	530	Safefree (PL_retstack);
536	}
537
538	static void
539	allocate_stack (Coro__State ctx, int alloc)
540	{
541	coro_stack *stack;
542
543	New (0, stack, 1, coro_stack);
544
545	stack->refcnt = 1;
546	stack->usecnt = 1;
547	stack->gencnt = ctx->gencnt = 0;
548	if (alloc)
549	{
550	#ifdef HAVE_MMAP
551	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
552	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
553	if (stack->sptr == (void *)-1)
554	#endif	531	#endif
555	{
556	/*FIXME*//*D*//* reasonable stack size! */
557	stack->ssize = -4096 * sizeof (long);
558	New (0, stack->sptr, 4096, long);
559	}
560	}
561	else
562	stack->sptr = 0;
563
564	ctx->stack = stack;
565	}	532	}
566		533
567	static void	534	static void
568	deallocate_stack (Coro__State ctx)	535	setup_coro (struct coro *coro)
569	{
570	coro_stack *stack = ctx->stack;
571
572	ctx->stack = 0;
573
574	if (stack)
575	{
576	if (!--stack->refcnt)
577	{
578	#ifdef HAVE_MMAP
579	if (stack->ssize > 0 && stack->sptr)
580	munmap (stack->sptr, stack->ssize);
581	else
582	#else
583	Safefree (stack->sptr);
584	#endif
585	Safefree (stack);
586	}
587	else if (ctx->gencnt == stack->gencnt)
588	--stack->usecnt;
589	}
590	}
591
592	static void
593	setup_coro (void *arg)
594	{	536	{
595	/*	537	/*
596	* emulate part of the perl startup here.	538	* emulate part of the perl startup here.
597	*/	539	*/
		540	dTHX;
598	dSP;	541	dSP;
599	Coro__State ctx = (Coro__State)arg;	542	UNOP myop;
600	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);	543	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
601		544
602	coro_init_stacks (aTHX);	545	coro_init_stacks (aTHX);
603	JMPENV_BOOTSTRAP;	546	/*PL_curcop = 0;*/
		547	/*PL_in_eval = PL_in_eval;*/ /* inherit */
		548	SvREFCNT_dec (GvAV (PL_defgv));
		549	GvAV (PL_defgv) = coro->args; coro->args = 0;
		550
604	SPAGAIN;	551	SPAGAIN;
605		552
606	/*PL_curcop = 0;*/	553	Zero (&myop, 1, UNOP);
607	SvREFCNT_dec (GvAV (PL_defgv));	554	myop.op_next = Nullop;
608	GvAV (PL_defgv) = ctx->args;	555	myop.op_flags = OPf_WANT_VOID;
609		556
610	if (ctx->stack)	557	PL_op = (OP *)&myop;
		558
		559	PUSHMARK(SP);
		560	XPUSHs (sub_init);
		561	PUTBACK;
		562	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		563	SPAGAIN;
		564
		565	ENTER; /* necessary e.g. for dounwind */
		566	}
		567
		568	static void
		569	free_coro_mortal ()
		570	{
		571	if (coro_mortal)
611	{	572	{
612	ctx->cursp = 0;	573	SvREFCNT_dec (coro_mortal);
613		574	coro_mortal = 0;
614	PUSHMARK(SP);
615	PUTBACK;
616	(void) call_sv (sub_init, G_VOID|G_NOARGS);
617	croak ("FATAL: CCTXT coroutine returned!");
618	}	575	}
619	else
620	{
621	UNOP myop;
622
623	PL_op = (OP *)&myop;
624
625	Zero(&myop, 1, UNOP);
626	myop.op_next = Nullop;
627	myop.op_flags = OPf_WANT_VOID;
628
629	PUSHMARK(SP);
630	XPUSHs (sub_init);
631	/*
632	* the next line is slightly wrong, as PL_op->op_next
633	* is actually being executed so we skip the first op.
634	* that doesn't matter, though, since it is only
635	* pp_nextstate and we never return...
636	* ah yes, and I don't care anyways ;)
637	*/
638	PUTBACK;
639	PL_op = pp_entersub();
640	SPAGAIN;
641
642	ENTER; /* necessary e.g. for dounwind */
643	}
644	}	576	}
645		577
646	static void	578	static void
647	continue_coro (void *arg)	579	coro_run (void *arg)
648	{	580	{
649	/*	581	/*
650	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
651	*/	583	*/
652	Coro__State ctx = (Coro__State)arg;	584	dTHX;
		585	int ret;
653		586
654	ctx->cursp = 0;	587	UNLOCK;
655	PL_op = PL_op->op_next;	588
656	CALLRUNOPS(aTHX);	589	PL_top_env = &PL_start_env;
657	/*NORETURN*/	590
		591	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV ((coro_stack *)arg));
		592	sv_setiv (get_sv ("Coro::State::cctx_restartop", FALSE), PTR2IV (PL_op));
		593
		594	/* continue at cctx_init, without entersub */
		595	PL_restartop = CvSTART (get_cv ("Coro::State::cctx_init", FALSE));
		596
		597	/* somebody will hit me for both perl_run and PL_restartop */
		598	ret = perl_run (aTHX_ PERL_GET_CONTEXT);
		599	printf ("ret %d\n", ret);//D
		600
		601	fputs ("FATAL: C coroutine fell over the edge of the world, aborting.\n", stderr);
658	abort ();	602	abort ();
659	}	603	}
660		604
661	STATIC void	605	static coro_stack *
		606	stack_new ()
		607	{
		608	coro_stack *stack;
		609
		610	New (0, stack, 1, coro_stack);
		611
		612	#if HAVE_MMAP
		613
		614	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		615	/* mmap suppsedly does allocate-on-write for us */
		616	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		617
		618	if (stack->sptr == (void *)-1)
		619	{
		620	perror ("FATAL: unable to mmap stack for coroutine");
		621	_exit (EXIT_FAILURE);
		622	}
		623
		624	# if STACKGUARD
		625	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		626	# endif
		627
		628	#else
		629
		630	stack->ssize = STACKSIZE * (long)sizeof (long);
		631	New (0, stack->sptr, STACKSIZE, long);
		632
		633	if (!stack->sptr)
		634	{
		635	perror (stderr, "FATAL: unable to malloc stack for coroutine");
		636	_exit (EXIT_FAILURE);
		637	}
		638
		639	#endif
		640
		641	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);
		642
		643	return stack;
		644	}
		645
		646	static void
		647	stack_free (coro_stack *stack)
		648	{
		649	if (!stack)
		650	return;
		651
		652	#if HAVE_MMAP
		653	munmap (stack->sptr, stack->ssize);
		654	#else
		655	Safefree (stack->sptr);
		656	#endif
		657
		658	Safefree (stack);
		659	}
		660
		661	static coro_stack *stack_first;
		662
		663	static coro_stack *
		664	stack_get ()
		665	{
		666	coro_stack *stack;
		667
		668	if (stack_first)
		669	{
		670	stack = stack_first;
		671	stack_first = stack->next;
		672	}
		673	else
		674	{
		675	stack = stack_new ();
		676	PL_op = PL_op->op_next;
		677	}
		678
		679	return stack;
		680	}
		681
		682	static void
		683	stack_put (coro_stack *stack)
		684	{
		685	stack->next = stack_first;
		686	stack_first = stack;
		687	}
		688
		689	/* never call directly, always through the coro_state_transfer global variable */
		690	static void
662	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	691	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)
663	{	692	{
664	dSP;
665	dSTACKLEVEL;	693	dSTACKLEVEL;
666		694
		695	/* sometimes transfer is only called to set idle_sp */
		696	if (flags == TRANSFER_SET_STACKLEVEL)
		697	((coro_stack *)prev)->idle_sp = STACKLEVEL;
667	if (prev != next)	698	else if (prev != next)
668	{	699	{
		700	coro_stack *prev__stack;
		701
		702	LOCK;
		703
669	if (next->mainstack)	704	if (next->mainstack)
670	{	705	{
		706	/* coroutine already started */
671	SAVE (prev, flags);	707	SAVE (prev, flags);
672	LOAD (next);	708	LOAD (next);
673
674	/* mark this state as in-use */
675	next->mainstack = 0;
676	next->tmps_ix = -2;
677
678	/* stacklevel changed? if yes, grab the stack for us! */
679	if (flags & TRANSFER_SAVE_CCTXT)
680	{
681	if (!prev->stack)
682	allocate_stack (prev, 0);
683	else if (prev->cursp != stacklevel
684	&& prev->stack->usecnt > 1)
685	{
686	prev->gencnt = ++prev->stack->gencnt;
687	prev->stack->usecnt = 1;
688	}
689
690	/* has our stack been invalidated? */
691	if (next->stack && next->stack->gencnt != next->gencnt)
692	{
693	deallocate_stack (next);
694	allocate_stack (next, 1);
695	coro_create (&(next->stack->cctx),
696	continue_coro, (void *)next,
697	next->stack->sptr, labs (next->stack->ssize));
698	}
699
700	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
701	}
702
703	}	709	}
704	else if (next->tmps_ix == -2)
705	croak ("tried to transfer to running coroutine");
706	else	710	else
707	{	711	{
		712	/* need to start coroutine */
708	SAVE (prev, -1); /* first get rid of the old state */	713	/* first get rid of the old state */
709		714	SAVE (prev, -1);
710	if (flags & TRANSFER_SAVE_CCTXT)	715	/* setup coroutine call */
711	{
712	if (!prev->stack)
713	allocate_stack (prev, 0);
714
715	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
716	{
717	setup_coro (next);
718
719	prev->stack->refcnt++;
720	prev->stack->usecnt++;
721	next->stack = prev->stack;
722	next->gencnt = prev->gencnt;
723	}
724	else
725	{
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	setup_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
731	}
732	}
733	else
734	setup_coro (next);	716	setup_coro (next);
		717	/* need a stack */
		718	next->stack = 0;
735	}	719	}
		720
		721	if (!prev->stack)
		722	/* create a new empty context */
		723	Newz (0, prev->stack, 1, coro_stack);
		724
		725	prev__stack = prev->stack;
		726
		727	/* possibly "free" the stack */
		728	if (prev__stack->idle_sp == STACKLEVEL)
		729	{
		730	stack_put (prev__stack);
		731	prev->stack = 0;
		732	}
		733
		734	if (!next->stack)
		735	next->stack = stack_get ();
		736
		737	if (prev__stack != next->stack)
		738	{
		739	prev__stack->top_env = PL_top_env;
		740	PL_top_env = next->stack->top_env;
		741	coro_transfer (&prev__stack->cctx, &next->stack->cctx);
		742	}
		743
		744	free_coro_mortal ();
		745
		746	UNLOCK;
736	}	747	}
		748	}
737		749
738	next->cursp = stacklevel;	750	/* use this function pointer to call the above function */
		751	/* this is done to increase chances of the compiler not inlining the call */
		752	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
		753	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
		754
		755	struct transfer_args
		756	{
		757	struct coro *prev, *next;
		758	int flags;
		759	};
		760
		761	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)
		762
		763	static void
		764	coro_state_destroy (struct coro *coro)
		765	{
		766	if (coro->refcnt--)
		767	return;
		768
		769	if (coro->mainstack && coro->mainstack != main_mainstack)
		770	{
		771	struct coro temp;
		772
		773	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
		774	LOAD (aTHX_ coro);
		775
		776	destroy_stacks (aTHX);
		777
		778	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		779
		780	coro->mainstack = 0;
		781	}
		782
		783	stack_free (coro->stack);
		784	SvREFCNT_dec (coro->args);
		785	Safefree (coro);
		786	}
		787
		788	static int
		789	coro_state_clear (SV *sv, MAGIC *mg)
		790	{
		791	struct coro *coro = (struct coro *)mg->mg_ptr;
		792	mg->mg_ptr = 0;
		793
		794	coro_state_destroy (coro);
		795
		796	return 0;
		797	}
		798
		799	static int
		800	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)
		801	{
		802	struct coro *coro = (struct coro *)mg->mg_ptr;
		803
		804	++coro->refcnt;
		805
		806	return 0;
		807	}
		808
		809	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };
		810
		811	static struct coro *
		812	SvSTATE (SV *coro)
		813	{
		814	HV *stash;
		815	MAGIC *mg;
		816
		817	if (SvROK (coro))
		818	coro = SvRV (coro);
		819
		820	stash = SvSTASH (coro);
		821	if (stash != coro_stash && stash != coro_state_stash)
		822	{
		823	/* very slow, but rare, check */
		824	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		825	croak ("Coro::State object required");
		826	}
		827
		828	mg = SvMAGIC (coro);
		829	assert (mg->mg_type == PERL_MAGIC_ext);
		830	return (struct coro *)mg->mg_ptr;
		831	}
		832
		833	static void
		834	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev, SV *next, int flags)
		835	{
		836	ta->prev = SvSTATE (prev);
		837	ta->next = SvSTATE (next);
		838	ta->flags = flags;
		839	}
		840
		841	static void
		842	api_transfer (SV *prev, SV *next, int flags)
		843	{
		844	dTHX;
		845	struct transfer_args ta;
		846
		847	prepare_transfer (aTHX_ &ta, prev, next, flags);
		848	TRANSFER (ta);
		849	}
		850
		851	/** Coro ********************************************************************/
		852
		853	#define PRIO_MAX 3
		854	#define PRIO_HIGH 1
		855	#define PRIO_NORMAL 0
		856	#define PRIO_LOW -1
		857	#define PRIO_IDLE -3
		858	#define PRIO_MIN -4
		859
		860	/* for Coro.pm */
		861	static GV *coro_current, *coro_idle;
		862	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		863	static int coro_nready;
		864
		865	static void
		866	coro_enq (pTHX_ SV *sv)
		867	{
		868	int prio;
		869
		870	if (SvTYPE (sv) != SVt_PVHV)
		871	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		872
		873	prio = SvSTATE (sv)->prio;
		874
		875	av_push (coro_ready [prio - PRIO_MIN], sv);
		876	coro_nready++;
		877	}
		878
		879	static SV *
		880	coro_deq (pTHX_ int min_prio)
		881	{
		882	int prio = PRIO_MAX - PRIO_MIN;
		883
		884	min_prio -= PRIO_MIN;
		885	if (min_prio < 0)
		886	min_prio = 0;
		887
		888	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		889	if (AvFILLp (coro_ready [prio]) >= 0)
		890	{
		891	coro_nready--;
		892	return av_shift (coro_ready [prio]);
		893	}
		894
		895	return 0;
		896	}
		897
		898	static void
		899	api_ready (SV *coro)
		900	{
		901	dTHX;
		902
		903	if (SvROK (coro))
		904	coro = SvRV (coro);
		905
		906	LOCK;
		907	coro_enq (aTHX_ SvREFCNT_inc (coro));
		908	UNLOCK;
		909	}
		910
		911	static void
		912	prepare_schedule (aTHX_ struct transfer_args *ta)
		913	{
		914	SV *current, *prev, *next;
		915
		916	LOCK;
		917
		918	current = GvSV (coro_current);
		919
		920	for (;;)
		921	{
		922	LOCK;
		923
		924	next = coro_deq (aTHX_ PRIO_MIN);
		925
		926	if (next)
		927	break;
		928
		929	UNLOCK;
		930
		931	{
		932	dSP;
		933
		934	ENTER;
		935	SAVETMPS;
		936
		937	PUSHMARK (SP);
		938	PUTBACK;
		939	call_sv (GvSV (coro_idle), G_DISCARD);
		940
		941	FREETMPS;
		942	LEAVE;
		943	}
		944	}
		945
		946	prev = SvRV (current);
		947	SvRV (current) = next;
		948
		949	/* free this only after the transfer */
		950	free_coro_mortal ();
		951	coro_mortal = prev;
		952
		953	ta->prev = SvSTATE (prev);
		954	ta->next = SvSTATE (next);
		955	ta->flags = TRANSFER_SAVE_ALL;
		956
		957	UNLOCK;
		958	}
		959
		960	static void
		961	prepare_cede (aTHX_ struct transfer_args *ta)
		962	{
		963	LOCK;
		964	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
		965	UNLOCK;
		966
		967	prepare_schedule (ta);
		968	}
		969
		970	static void
		971	api_schedule (void)
		972	{
		973	dTHX;
		974	struct transfer_args ta;
		975
		976	prepare_schedule (&ta);
		977	TRANSFER (ta);
		978	}
		979
		980	static void
		981	api_cede (void)
		982	{
		983	dTHX;
		984	struct transfer_args ta;
		985
		986	prepare_cede (&ta);
		987	TRANSFER (ta);
739	}	988	}
740		989
741	MODULE = Coro::State PACKAGE = Coro::State	990	MODULE = Coro::State PACKAGE = Coro::State
742		991
743	PROTOTYPES: ENABLE	992	PROTOTYPES: DISABLE
744		993
745	BOOT:	994	BOOT:
746	{ /* {} necessary for stoopid perl-5.6.x */	995	{
747	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	996	#ifdef USE_ITHREADS
748	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	997	MUTEX_INIT (&coro_mutex);
		998	#endif
		999	BOOT_PAGESIZE;
		1000
749	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1001	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
750		1002
751	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1003	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
752	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1004	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
753	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1005	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
754	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
755
756	if (!padlist_cache)
757	padlist_cache = newHV ();
758		1006
759	main_mainstack = PL_mainstack;	1007	main_mainstack = PL_mainstack;
760	}
761		1008
762	Coro::State	1009	coroapi.ver = CORO_API_VERSION;
763	_newprocess(args)	1010	coroapi.transfer = api_transfer;
764	SV * args	1011
765	PROTOTYPE: $	1012	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1013	}
		1014
		1015	SV *
		1016	new (char *klass, ...)
766	CODE:	1017	CODE:
767	Coro__State coro;	1018	{
		1019	struct coro *coro;
		1020	HV *hv;
		1021	int i;
768		1022
769	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
770	croak ("Coro::State::_newprocess expects an arrayref");
771
772	New (0, coro, 1, struct coro);	1023	Newz (0, coro, 1, struct coro);
		1024	coro->args = newAV ();
773		1025
774	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1026	hv = newHV ();
		1027	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1028	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1029
		1030	for (i = 1; i < items; i++)
		1031	av_push (coro->args, newSVsv (ST (i)));
		1032
775	coro->mainstack = 0; /* actual work is done inside transfer */	1033	/*coro->mainstack = 0; *//*actual work is done inside transfer */
776	coro->stack = 0;	1034	/*coro->stack = 0;*/
777		1035	}
778	RETVAL = coro;
779	OUTPUT:	1036	OUTPUT:
780	RETVAL	1037	RETVAL
781		1038
782	void	1039	void
783	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1040	_set_stacklevel (...)
784	Coro::State_or_hashref prev	1041	ALIAS:
785	Coro::State_or_hashref next	1042	Coro::State::transfer = 1
786	int flags	1043	Coro::schedule = 2
787	PROTOTYPE: @	1044	Coro::cede = 3
		1045	Coro::Cont::yield = 4
788	CODE:	1046	CODE:
789	transfer (aTHX_ prev, next, flags);	1047	{
		1048	struct transfer_args ta;
		1049
		1050	switch (ix)
		1051	{
		1052	case 0:
		1053	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
		1054	ta.next = 0;
		1055	ta.flags = TRANSFER_SET_STACKLEVEL;
		1056	break;
		1057
		1058	case 1:
		1059	if (items != 3)
		1060	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1061
		1062	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1063	break;
		1064
		1065	case 2:
		1066	prepare_schedule (&ta);
		1067	break;
		1068
		1069	case 3:
		1070	prepare_cede (&ta);
		1071	break;
		1072
		1073	case 4:
		1074	{
		1075	SV *yieldstack;
		1076	SV *sv;
		1077	AV *defav = GvAV (PL_defgv);
		1078
		1079	yieldstack = *hv_fetch (
		1080	(HV *)SvRV (GvSV (coro_current)),
		1081	"yieldstack", sizeof ("yieldstack") - 1,
		1082	0
		1083	);
		1084
		1085	/* set up @_ -- ugly */
		1086	av_clear (defav);
		1087	av_fill (defav, items - 1);
		1088	while (items--)
		1089	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1090
		1091	sv = av_pop ((AV *)SvRV (yieldstack));
		1092	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1093	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1094	ta.flags = 0;
		1095	SvREFCNT_dec (sv);
		1096	}
		1097	break;
		1098
		1099	}
		1100
		1101	TRANSFER (ta);
		1102	}
790		1103
791	void	1104	void
792	DESTROY(coro)	1105	_clone_state_from (SV *dst, SV *src)
793	Coro::State coro	1106	CODE:
		1107	{
		1108	struct coro *coro_src = SvSTATE (src);
		1109
		1110	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1111
		1112	++coro_src->refcnt;
		1113	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1114	}
		1115
		1116	void
		1117	_nonlocal_goto (IV nextop)
		1118	CODE:
		1119	/* uuh, somebody will kill me again for this */
		1120	PL_op->op_next = INT2PTR (OP *, nextop);
		1121
		1122	void
		1123	_exit (code)
		1124	int code
		1125	PROTOTYPE: $
		1126	CODE:
		1127	_exit (code);
		1128
		1129	MODULE = Coro::State PACKAGE = Coro
		1130
		1131	BOOT:
		1132	{
		1133	int i;
		1134
		1135	coro_stash = gv_stashpv ("Coro", TRUE);
		1136
		1137	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1138	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1139	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1140	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1141	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1142	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1143
		1144	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
		1145	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
		1146
		1147	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1148	coro_ready[i] = newAV ();
		1149
		1150	{
		1151	SV *sv = perl_get_sv("Coro::API", 1);
		1152
		1153	coroapi.schedule = api_schedule;
		1154	coroapi.cede = api_cede;
		1155	coroapi.ready = api_ready;
		1156	coroapi.nready = &coro_nready;
		1157	coroapi.current = coro_current;
		1158
		1159	GCoroAPI = &coroapi;
		1160	sv_setiv (sv, (IV)&coroapi);
		1161	SvREADONLY_on (sv);
		1162	}
		1163	}
		1164
		1165	int
		1166	prio (Coro::State coro, int newprio = 0)
		1167	ALIAS:
		1168	nice = 1
794	CODE:	1169	CODE:
		1170	{
		1171	RETVAL = coro->prio;
795		1172
796	if (coro->mainstack && coro->mainstack != main_mainstack)	1173	if (items > 1)
797	{	1174	{
798	struct coro temp;	1175	if (ix)
		1176	newprio += coro->prio;
799		1177
800	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1178	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
801	LOAD(aTHX_ coro);	1179	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
802		1180
803	destroy_stacks (aTHX);	1181	coro->prio = newprio;
804
805	LOAD((&temp)); /* this will get rid of defsv etc.. */
806
807	coro->mainstack = 0;
808	}	1182	}
809		1183	}
810	deallocate_stack (coro);
811
812	Safefree (coro);
813		1184
814	void	1185	void
815	flush()	1186	ready (SV *self)
		1187	PROTOTYPE: $
816	CODE:	1188	CODE:
817	#ifdef MAY_FLUSH	1189	api_ready (self);
818	flush_padlist_cache ();
819	#endif
820		1190
		1191	int
		1192	nready (...)
		1193	PROTOTYPE:
		1194	CODE:
		1195	RETVAL = coro_nready;
		1196	OUTPUT:
		1197	RETVAL
		1198
821	MODULE = Coro::State PACKAGE = Coro::Cont	1199	MODULE = Coro::State PACKAGE = Coro::AIO
822		1200
823	# this is slightly dirty	1201	SV *
		1202	_get_state ()
		1203	CODE:
		1204	{
		1205	struct {
		1206	int errorno;
		1207	int laststype;
		1208	int laststatval;
		1209	Stat_t statcache;
		1210	} data;
		1211
		1212	data.errorno = errno;
		1213	data.laststype = PL_laststype;
		1214	data.laststatval = PL_laststatval;
		1215	data.statcache = PL_statcache;
		1216
		1217	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1218	}
		1219	OUTPUT:
		1220	RETVAL
824		1221
825	void	1222	void
826	yield(...)	1223	_set_state (char *data_)
827	PROTOTYPE: @	1224	PROTOTYPE: $
828	CODE:	1225	CODE:
829	static SV *returnstk;	1226	{
830	SV *sv;	1227	struct {
831	AV *defav = GvAV (PL_defgv);	1228	int errorno;
832	struct coro *prev, *next;	1229	int laststype;
		1230	int laststatval;
		1231	Stat_t statcache;
		1232	} *data = (void *)data_;
833		1233
834	if (!returnstk)	1234	errno = data->errorno;
835	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1235	PL_laststype = data->laststype;
836		1236	PL_laststatval = data->laststatval;
837	/* set up @_ -- ugly */	1237	PL_statcache = data->statcache;
838	av_clear (defav);	1238	}
839	av_fill (defav, items - 1);
840	while (items--)
841	av_store (defav, items, SvREFCNT_inc (ST(items)));
842
843	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
844	sv = av_pop ((AV *)SvRV (returnstk));
845	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
846	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
847	SvREFCNT_dec (sv);
848
849	transfer(aTHX_ prev, next, 0);
850

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