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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.28 by root, Sat Aug 25 21:32:05 2001 UTC vs.
Revision 1.108 by root, Mon Nov 27 18:15:47 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
6		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	#define PERL_VERSION_ATLEAST(a,b,c) \
		14	(PERL_REVISION > (a) \
		15	|| (PERL_REVISION == (a) \
		16	&& (PERL_VERSION > (b) \
		17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		18
		19	#if !PERL_VERSION_ATLEAST (5,6,0)
		20	# ifndef PL_ppaddr
		21	# define PL_ppaddr ppaddr
		22	# endif
		23	# ifndef call_sv
		24	# define call_sv perl_call_sv
		25	# endif
		26	# ifndef get_sv
		27	# define get_sv perl_get_sv
		28	# endif
		29	# ifndef get_cv
		30	# define get_cv perl_get_cv
		31	# endif
		32	# ifndef IS_PADGV
		33	# define IS_PADGV(v) 0
		34	# endif
		35	# ifndef IS_PADCONST
		36	# define IS_PADCONST(v) 0
		37	# endif
		38	#endif
		39
7	#include <signal.h>	40	#include <stdio.h>
		41	#include <errno.h>
		42
		43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		44	# undef STACKGUARD
		45	#endif
		46
		47	#ifndef STACKGUARD
		48	# define STACKGUARD 0
		49	#endif
8		50
9	#ifdef HAVE_MMAP	51	#ifdef HAVE_MMAP
10	# include <unistd.h>	52	# include <unistd.h>
11	# include <sys/mman.h>	53	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	54	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	55	# ifdef MAP_ANON
		56	# define MAP_ANONYMOUS MAP_ANON
15	# else	57	# else
16	# undef HAVE_MMAP	58	# undef HAVE_MMAP
17	# endif	59	# endif
18	# endif	60	# endif
		61	# include <limits.h>
		62	# ifndef PAGESIZE
		63	# define PAGESIZE pagesize
		64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		65	static long pagesize;
		66	# else
		67	# define BOOT_PAGESIZE (void)0
19	#endif	68	# endif
20		69	#else
21	#define MAY_FLUSH /* increases codesize and is rarely used */	70	# define PAGESIZE 0
22		71	# define BOOT_PAGESIZE (void)0
23	#define SUB_INIT "Coro::State::initialize"	72	#endif
24	#define UCORO_STATE "_coro_state"
25		73
26	/* The next macro should declare a variable stacklevel that contains and approximation	74	/* 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	75	* to the current C stack pointer. Its property is that it changes with each call
28	* and should be unique. */	76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	78	#define STACKLEVEL ((void *)&stacklevel)
30		79
31	#define labs(l) ((l) >= 0 ? (l) : -(l))	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
		81
		82	#if __GNUC__ >= 3
		83	# define attribute(x) __attribute__(x)
		84	#else
		85	# define attribute(x)
		86	#endif
		87
		88	#define NOINLINE attribute ((noinline))
32		89
33	#include "CoroAPI.h"	90	#include "CoroAPI.h"
34		91
		92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		93
		94	#ifdef USE_ITHREADS
		95	static perl_mutex coro_mutex;
		96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		98	#else
		99	# define LOCK (void)0
		100	# define UNLOCK (void)0
		101	#endif
		102
35	static struct CoroAPI coroapi;	103	static struct CoroAPI coroapi;
		104	static AV *main_mainstack; /* used to differentiate between $main and others */
		105	static HV *coro_state_stash, *coro_stash;
		106	static SV *coro_mortal; /* will be freed after next transfer */
36		107
37	/* this is actually not only the c stack but also c registers etc... */	108	static struct coro_cctx *cctx_first;
		109	static int cctx_count, cctx_idle;
		110
		111	/* this is a structure representing a c-level coroutine */
38	typedef struct {	112	typedef struct coro_cctx {
39	int refcnt; /* pointer reference counter */	113	struct coro_cctx *next;
40	int usecnt; /* shared by how many coroutines */
41	int gencnt; /* generation counter */
42		114
43	coro_context cctx;	115	/* the stack */
44
45	void *sptr;	116	void *sptr;
46	long ssize; /* positive == mmap, otherwise malloc */	117	long ssize; /* positive == mmap, otherwise malloc */
47	} coro_stack;
48		118
		119	/* cpu state */
		120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		121	JMPENV *top_env;
		122	coro_context cctx;
		123
		124	#if USE_VALGRIND
		125	int valgrind_id;
		126	#endif
		127	} coro_cctx;
		128
		129	/* this is a structure representing a perl-level coroutine */
49	struct coro {	130	struct coro {
50	/* the optional C context */	131	/* the c coroutine allocated to this perl coroutine, if any */
51	coro_stack *stack;	132	coro_cctx *cctx;
52	void *cursp;	133
		134	/* data associated with this coroutine (initial args) */
		135	AV *args;
53	int gencnt;	136	int refcnt;
54		137
55	/* optionally saved, might be zero */	138	/* optionally saved, might be zero */
56	AV *defav;	139	AV *defav;
57	SV *defsv;	140	SV *defsv;
58	SV *errsv;	141	SV *errsv;
59		142
60	/* saved global state not related to stacks */	143	#define VAR(name,type) type name;
61	U8 dowarn;	144	# include "state.h"
62	I32 in_eval;	145	#undef VAR
63		146
64	/* the stacks and related info (callchain etc..) */	147	/* coro process data */
65	PERL_SI *curstackinfo;	148	int prio;
66	AV *curstack;
67	AV *mainstack;
68	SV **stack_sp;
69	OP *op;
70	SV **curpad;
71	SV **stack_base;
72	SV **stack_max;
73	SV **tmps_stack;
74	I32 tmps_floor;
75	I32 tmps_ix;
76	I32 tmps_max;
77	I32 *markstack;
78	I32 *markstack_ptr;
79	I32 *markstack_max;
80	I32 *scopestack;
81	I32 scopestack_ix;
82	I32 scopestack_max;
83	ANY *savestack;
84	I32 savestack_ix;
85	I32 savestack_max;
86	OP **retstack;
87	I32 retstack_ix;
88	I32 retstack_max;
89	COP *curcop;
90	JMPENV *top_env;
91
92	/* data associated with this coroutine (initial args) */
93	AV *args;
94	};	149	};
95		150
96	typedef struct coro *Coro__State;	151	typedef struct coro *Coro__State;
97	typedef struct coro *Coro__State_or_hashref;	152	typedef struct coro *Coro__State_or_hashref;
98		153
99	static AV *main_mainstack; /* used to differentiate between $main and others */	154	static AV *
100	static HV *coro_state_stash;	155	coro_clone_padlist (CV *cv)
101	static SV *ucoro_state_sv;
102	static U32 ucoro_state_hash;
103	static HV *padlist_cache;
104
105	/* mostly copied from op.c:cv_clone2 */
106	STATIC AV *
107	clone_padlist (AV *protopadlist)
108	{	156	{
109	AV *av;	157	AV *padlist = CvPADLIST (cv);
110	I32 ix;
111	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
112	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
113	SV **pname = AvARRAY (protopad_name);
114	SV **ppad = AvARRAY (protopad);
115	I32 fname = AvFILLp (protopad_name);
116	I32 fpad = AvFILLp (protopad);
117	AV *newpadlist, *newpad_name, *newpad;	158	AV *newpadlist, *newpad;
118	SV **npad;
119
120	newpad_name = newAV ();
121	for (ix = fname; ix >= 0; ix--)
122	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
123
124	newpad = newAV ();
125	av_fill (newpad, AvFILLp (protopad));
126	npad = AvARRAY (newpad);
127		159
128	newpadlist = newAV ();	160	newpadlist = newAV ();
129	AvREAL_off (newpadlist);	161	AvREAL_off (newpadlist);
130	av_store (newpadlist, 0, (SV *) newpad_name);	162	#if PERL_VERSION_ATLEAST (5,9,0)
		163	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		164	#else
		165	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		166	#endif
		167	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		168	--AvFILLp (padlist);
		169
		170	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
131	av_store (newpadlist, 1, (SV *) newpad);	171	av_store (newpadlist, 1, (SV *)newpad);
132		172
133	av = newAV (); /* will be @_ */	173	return newpadlist;
134	av_extend (av, 0);	174	}
135	av_store (newpad, 0, (SV *) av);
136	AvFLAGS (av) = AVf_REIFY;
137		175
138	for (ix = fpad; ix > 0; ix--)	176	static void
		177	free_padlist (AV *padlist)
		178	{
		179	/* may be during global destruction */
		180	if (SvREFCNT (padlist))
139	{	181	{
140	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	182	I32 i = AvFILLp (padlist);
141	if (namesv && namesv != &PL_sv_undef)	183	while (i >= 0)
142	{	184	{
143	char *name = SvPVX (namesv); /* XXX */	185	SV **svp = av_fetch (padlist, i--, FALSE);
144	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	186	if (svp)
145	{ /* lexical from outside? */
146	npad[ix] = SvREFCNT_inc (ppad[ix]);
147	}	187	{
148	else
149	{ /* our own lexical */
150	SV *sv;	188	SV *sv;
151	if (*name == '&')	189	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
152	sv = SvREFCNT_inc (ppad[ix]);	190	SvREFCNT_dec (sv);
153	else if (*name == '@')	191
154	sv = (SV *) newAV ();	192	SvREFCNT_dec (*svp);
155	else if (*name == '%')
156	sv = (SV *) newHV ();
157	else
158	sv = NEWSV (0, 0);
159	if (!SvPADBUSY (sv))
160	SvPADMY_on (sv);
161	npad[ix] = sv;
162	}	193	}
163	}	194	}
164	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	195
165	{	196	SvREFCNT_dec ((SV*)padlist);
166	npad[ix] = SvREFCNT_inc (ppad[ix]);
167	}
168	else
169	{
170	SV *sv = NEWSV (0, 0);
171	SvPADTMP_on (sv);
172	npad[ix] = sv;
173	}
174	}	197	}
		198	}
175		199
176	#if 0 /* return -ENOTUNDERSTOOD */	200	static int
177	/* Now that vars are all in place, clone nested closures. */	201	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		202	{
		203	AV *padlist;
		204	AV *av = (AV *)mg->mg_obj;
178		205
179	for (ix = fpad; ix > 0; ix--) {	206	/* casting is fun. */
180	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	207	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
181	if (namesv	208	free_padlist (padlist);
182	&& namesv != &PL_sv_undef	209
183	&& !(SvFLAGS(namesv) & SVf_FAKE)	210	SvREFCNT_dec (av);
184	&& *SvPVX(namesv) == '&'	211
185	&& CvCLONE(ppad[ix]))	212	return 0;
186	{	213	}
187	CV *kid = cv_clone((CV*)ppad[ix]);	214
188	SvREFCNT_dec(ppad[ix]);	215	#define PERL_MAGIC_coro PERL_MAGIC_ext
189	CvCLONE_on(kid);	216
190	SvPADMY_on(kid);	217	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
191	npad[ix] = (SV*)kid;	218
192	}	219	/* the next two functions merely cache the padlists */
		220	static void
		221	get_padlist (CV *cv)
		222	{
		223	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		224
		225	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
		226	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
		227	else
		228	{
		229	#if 0
		230	/* this is probably cleaner, but also slower? */
		231	CV *cp = Perl_cv_clone (cv);
		232	CvPADLIST (cv) = CvPADLIST (cp);
		233	CvPADLIST (cp) = 0;
		234	SvREFCNT_dec (cp);
		235	#else
		236	CvPADLIST (cv) = coro_clone_padlist (cv);
		237	#endif
		238	}
		239	}
		240
		241	static void
		242	put_padlist (CV *cv)
		243	{
		244	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		245
		246	if (!mg)
		247	{
		248	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		249	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		250	mg->mg_virtual = &vtbl_coro;
		251	mg->mg_obj = (SV *)newAV ();
193	}	252	}
194	#endif
195		253
196	return newpadlist;
197	}
198
199	#ifdef MAY_FLUSH
200	STATIC void
201	free_padlist (AV *padlist)
202	{
203	/* may be during global destruction */
204	if (SvREFCNT(padlist))
205	{
206	I32 i = AvFILLp(padlist);
207	while (i >= 0)
208	{
209	SV **svp = av_fetch(padlist, i--, FALSE);
210	SV *sv = svp ? *svp : Nullsv;
211	if (sv)
212	SvREFCNT_dec(sv);
213	}
214
215	SvREFCNT_dec((SV*)padlist);
216	}
217	}
218	#endif
219
220	/* the next two functions merely cache the padlists */
221	STATIC void
222	get_padlist (CV *cv)
223	{
224	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
225
226	if (he && AvFILLp ((AV *)*he) >= 0)
227	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
228	else
229	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
230	}
231
232	STATIC void
233	put_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
236
237	if (SvTYPE (*he) != SVt_PVAV)
238	{
239	SvREFCNT_dec (*he);
240	*he = (SV *)newAV ();
241	}
242
243	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	254	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
244	}	255	}
245
246	#ifdef MAY_FLUSH
247	STATIC void
248	flush_padlist_cache ()
249	{
250	HV *hv = padlist_cache;
251	padlist_cache = newHV ();
252
253	if (hv_iterinit (hv))
254	{
255	HE *he;
256	AV *padlist;
257
258	while (!!(he = hv_iternext (hv)))
259	{
260	AV *av = (AV *)HeVAL(he);
261
262	/* casting is fun. */
263	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
264	free_padlist (padlist);
265	}
266	}
267
268	SvREFCNT_dec (hv);
269	}
270	#endif
271		256
272	#define SB do {	257	#define SB do {
273	#define SE } while (0)	258	#define SE } while (0)
274		259
275	#define LOAD(state) load_state(aTHX_ (state));	260	#define LOAD(state) load_state((state));
276	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	261	#define SAVE(state,flags) save_state((state),(flags));
277		262
278	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	263	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
279		264
280	static void	265	static void
281	load_state(pTHX_ Coro__State c)	266	load_state(Coro__State c)
282	{	267	{
283	PL_dowarn = c->dowarn;	268	#define VAR(name,type) PL_ ## name = c->name;
284	PL_in_eval = c->in_eval;	269	# include "state.h"
285		270	#undef VAR
286	PL_curstackinfo = c->curstackinfo;
287	PL_curstack = c->curstack;
288	PL_mainstack = c->mainstack;
289	PL_stack_sp = c->stack_sp;
290	PL_op = c->op;
291	PL_curpad = c->curpad;
292	PL_stack_base = c->stack_base;
293	PL_stack_max = c->stack_max;
294	PL_tmps_stack = c->tmps_stack;
295	PL_tmps_floor = c->tmps_floor;
296	PL_tmps_ix = c->tmps_ix;
297	PL_tmps_max = c->tmps_max;
298	PL_markstack = c->markstack;
299	PL_markstack_ptr = c->markstack_ptr;
300	PL_markstack_max = c->markstack_max;
301	PL_scopestack = c->scopestack;
302	PL_scopestack_ix = c->scopestack_ix;
303	PL_scopestack_max = c->scopestack_max;
304	PL_savestack = c->savestack;
305	PL_savestack_ix = c->savestack_ix;
306	PL_savestack_max = c->savestack_max;
307	PL_retstack = c->retstack;
308	PL_retstack_ix = c->retstack_ix;
309	PL_retstack_max = c->retstack_max;
310	PL_curcop = c->curcop;
311	PL_top_env = c->top_env;
312		271
313	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	272	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
314	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	273	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
315	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	274	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
316		275
…		…
325		284
326	if (padlist)	285	if (padlist)
327	{	286	{
328	put_padlist (cv); /* mark this padlist as available */	287	put_padlist (cv); /* mark this padlist as available */
329	CvPADLIST(cv) = padlist;	288	CvPADLIST(cv) = padlist;
330	#ifdef USE_THREADS
331	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
332	#endif
333	}	289	}
334		290
335	++CvDEPTH(cv);	291	++CvDEPTH(cv);
336	}	292	}
337		293
338	PUTBACK;	294	PUTBACK;
339	}	295	}
340	}	296	}
341		297
342	static void	298	static void
343	save_state(pTHX_ Coro__State c, int flags)	299	save_state(Coro__State c, int flags)
344	{	300	{
345	{	301	{
346	dSP;	302	dSP;
347	I32 cxix = cxstack_ix;	303	I32 cxix = cxstack_ix;
348	PERL_CONTEXT *ccstk = cxstack;	304	PERL_CONTEXT *ccstk = cxstack;
…		…
355		311
356	PUSHs (Nullsv);	312	PUSHs (Nullsv);
357	/* this loop was inspired by pp_caller */	313	/* this loop was inspired by pp_caller */
358	for (;;)	314	for (;;)
359	{	315	{
360	do	316	while (cxix >= 0)
361	{	317	{
362	PERL_CONTEXT *cx = &ccstk[cxix--];	318	PERL_CONTEXT *cx = &ccstk[cxix--];
363		319
364	if (CxTYPE(cx) == CXt_SUB)	320	if (CxTYPE(cx) == CXt_SUB)
365	{	321	{
366	CV *cv = cx->blk_sub.cv;	322	CV *cv = cx->blk_sub.cv;
367	if (CvDEPTH(cv))	323	if (CvDEPTH(cv))
368	{	324	{
369	#ifdef USE_THREADS
370	/*XPUSHs ((SV *)CvOWNER(cv));*/
371	/*CvOWNER(cv) = 0;*/
372	/*error must unlock this cv etc.. etc...*/
373	#endif
374	EXTEND (SP, CvDEPTH(cv)*2);	325	EXTEND (SP, CvDEPTH(cv)*2);
375		326
376	while (--CvDEPTH(cv))	327	while (--CvDEPTH(cv))
377	{	328	{
378	/* this tells the restore code to increment CvDEPTH */	329	/* this tells the restore code to increment CvDEPTH */
…		…
381	}	332	}
382		333
383	PUSHs ((SV *)CvPADLIST(cv));	334	PUSHs ((SV *)CvPADLIST(cv));
384	PUSHs ((SV *)cv);	335	PUSHs ((SV *)cv);
385		336
386	get_padlist (cv); /* this is a monster */	337	get_padlist (cv);
387	}	338	}
388	}	339	}
		340	#ifdef CXt_FORMAT
389	else if (CxTYPE(cx) == CXt_FORMAT)	341	else if (CxTYPE(cx) == CXt_FORMAT)
390	{	342	{
391	/* I never used formats, so how should I know how these are implemented? */	343	/* I never used formats, so how should I know how these are implemented? */
392	/* my bold guess is as a simple, plain sub... */	344	/* my bold guess is as a simple, plain sub... */
393	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	345	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
394	}	346	}
		347	#endif
395	}	348	}
396	while (cxix >= 0);
397		349
398	if (top_si->si_type == PERLSI_MAIN)	350	if (top_si->si_type == PERLSI_MAIN)
399	break;	351	break;
400		352
401	top_si = top_si->si_prev;	353	top_si = top_si->si_prev;
…		…
408		360
409	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	361	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
410	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	362	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
411	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	363	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
412		364
413	c->dowarn = PL_dowarn;	365	#define VAR(name,type)c->name = PL_ ## name;
414	c->in_eval = PL_in_eval;	366	# include "state.h"
415		367	#undef VAR
416	c->curstackinfo = PL_curstackinfo;
417	c->curstack = PL_curstack;
418	c->mainstack = PL_mainstack;
419	c->stack_sp = PL_stack_sp;
420	c->op = PL_op;
421	c->curpad = PL_curpad;
422	c->stack_base = PL_stack_base;
423	c->stack_max = PL_stack_max;
424	c->tmps_stack = PL_tmps_stack;
425	c->tmps_floor = PL_tmps_floor;
426	c->tmps_ix = PL_tmps_ix;
427	c->tmps_max = PL_tmps_max;
428	c->markstack = PL_markstack;
429	c->markstack_ptr = PL_markstack_ptr;
430	c->markstack_max = PL_markstack_max;
431	c->scopestack = PL_scopestack;
432	c->scopestack_ix = PL_scopestack_ix;
433	c->scopestack_max = PL_scopestack_max;
434	c->savestack = PL_savestack;
435	c->savestack_ix = PL_savestack_ix;
436	c->savestack_max = PL_savestack_max;
437	c->retstack = PL_retstack;
438	c->retstack_ix = PL_retstack_ix;
439	c->retstack_max = PL_retstack_max;
440	c->curcop = PL_curcop;
441	c->top_env = PL_top_env;
442	}	368	}
443		369
444	/*	370	/*
445	* allocate various perl stacks. This is an exact copy	371	* allocate various perl stacks. This is an exact copy
446	* of perl.c:init_stacks, except that it uses less memory	372	* of perl.c:init_stacks, except that it uses less memory
447	* on the assumption that coroutines do not usually need	373	* on the (sometimes correct) assumption that coroutines do
448	* a lot of stackspace.	374	* not usually need a lot of stackspace.
449	*/	375	*/
450	STATIC void	376	static void
451	coro_init_stacks (pTHX)	377	coro_init_stacks ()
452	{	378	{
453	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	379	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
454	PL_curstackinfo->si_type = PERLSI_MAIN;	380	PL_curstackinfo->si_type = PERLSI_MAIN;
455	PL_curstack = PL_curstackinfo->si_stack;	381	PL_curstack = PL_curstackinfo->si_stack;
456	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	382	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
…		…
466		392
467	New(54,PL_markstack,16,I32);	393	New(54,PL_markstack,16,I32);
468	PL_markstack_ptr = PL_markstack;	394	PL_markstack_ptr = PL_markstack;
469	PL_markstack_max = PL_markstack + 16;	395	PL_markstack_max = PL_markstack + 16;
470		396
		397	#ifdef SET_MARK_OFFSET
471	SET_MARK_OFFSET;	398	SET_MARK_OFFSET;
		399	#endif
472		400
473	New(54,PL_scopestack,16,I32);	401	New(54,PL_scopestack,16,I32);
474	PL_scopestack_ix = 0;	402	PL_scopestack_ix = 0;
475	PL_scopestack_max = 16;	403	PL_scopestack_max = 16;
476		404
477	New(54,PL_savestack,96,ANY);	405	New(54,PL_savestack,96,ANY);
478	PL_savestack_ix = 0;	406	PL_savestack_ix = 0;
479	PL_savestack_max = 96;	407	PL_savestack_max = 96;
480		408
		409	#if !PERL_VERSION_ATLEAST (5,9,0)
481	New(54,PL_retstack,8,OP*);	410	New(54,PL_retstack,8,OP*);
482	PL_retstack_ix = 0;	411	PL_retstack_ix = 0;
483	PL_retstack_max = 8;	412	PL_retstack_max = 8;
		413	#endif
484	}	414	}
485		415
486	/*	416	/*
487	* destroy the stacks, the callchain etc...	417	* destroy the stacks, the callchain etc...
488	* still there is a memleak of 128 bytes...
489	*/	418	*/
490	STATIC void	419	static void
491	destroy_stacks(pTHX)	420	coro_destroy_stacks ()
492	{	421	{
		422	if (!IN_DESTRUCT)
		423	{
493	/* is this ugly, I ask? */	424	/* is this ugly, I ask? */
494	while (PL_scopestack_ix)	425	LEAVE_SCOPE (0);
495	LEAVE;
496		426
497	/* sure it is, but more important: is it correct?? :/ */	427	/* sure it is, but more important: is it correct?? :/ */
498	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
499	FREETMPS;	428	FREETMPS;
		429
		430	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		431	}
500		432
501	while (PL_curstackinfo->si_next)	433	while (PL_curstackinfo->si_next)
502	PL_curstackinfo = PL_curstackinfo->si_next;	434	PL_curstackinfo = PL_curstackinfo->si_next;
503		435
504	while (PL_curstackinfo)	436	while (PL_curstackinfo)
505	{	437	{
506	PERL_SI *p = PL_curstackinfo->si_prev;	438	PERL_SI *p = PL_curstackinfo->si_prev;
507		439
508	{	440	{ /*D*//*remove*/
509	dSP;	441	dSP;
510	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	442	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
511	PUTBACK; /* possibly superfluous */	443	PUTBACK; /* possibly superfluous */
512	}	444	}
513		445
514	if (PL_main_cv != Nullcv) /* don't during destruction. hack? */	446	if (!IN_DESTRUCT)
515	dounwind(-1);	447	{
516		448	dounwind (-1);/*D*//*remove*/
517	SvREFCNT_dec(PL_curstackinfo->si_stack);	449	SvREFCNT_dec (PL_curstackinfo->si_stack);
		450	}
		451
518	Safefree(PL_curstackinfo->si_cxstack);	452	Safefree (PL_curstackinfo->si_cxstack);
519	Safefree(PL_curstackinfo);	453	Safefree (PL_curstackinfo);
520	PL_curstackinfo = p;	454	PL_curstackinfo = p;
521	}	455	}
522		456
523	Safefree(PL_tmps_stack);	457	Safefree (PL_tmps_stack);
524	Safefree(PL_markstack);	458	Safefree (PL_markstack);
525	Safefree(PL_scopestack);	459	Safefree (PL_scopestack);
526	Safefree(PL_savestack);	460	Safefree (PL_savestack);
		461	#if !PERL_VERSION_ATLEAST (5,9,0)
527	Safefree(PL_retstack);	462	Safefree (PL_retstack);
528	}
529
530	static void
531	allocate_stack (Coro__State ctx, int alloc)
532	{
533	coro_stack *stack;
534
535	New (0, stack, 1, coro_stack);
536
537	stack->refcnt = 1;
538	stack->usecnt = 1;
539	stack->gencnt = ctx->gencnt = 0;
540	if (alloc)
541	{
542	#ifdef HAVE_MMAP
543	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
544	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
545	if (stack->sptr == (void *)-1)
546	#endif	463	#endif
547	{
548	/*FIXME*//*D*//* reasonable stack size! */
549	stack->ssize = -4096 * sizeof (long);
550	New (0, stack->sptr, 4096, long);
551	}
552	}
553	else
554	stack->sptr = 0;
555
556	ctx->stack = stack;
557	}	464	}
558		465
559	static void	466	static void
560	deallocate_stack (Coro__State ctx)	467	setup_coro (struct coro *coro)
561	{
562	coro_stack *stack = ctx->stack;
563
564	ctx->stack = 0;
565
566	if (stack)
567	{
568	printf ("deallocating stack %p %d\n", stack, stack->refcnt);/*D*/
569	if (!--stack->refcnt)
570	{
571	#ifdef HAVE_MMAP
572	if (stack->ssize > 0 && stack->sptr)
573	munmap (stack->sptr, stack->ssize);
574	else
575	#else
576	Safefree (stack->sptr);
577	#endif
578	Safefree (stack);
579	}
580	else if (ctx->gencnt == stack->gencnt)
581	--stack->usecnt;
582	}
583	}
584
585	static void
586	setup_coro (void *arg)
587	{	468	{
588	/*	469	/*
589	* emulate part of the perl startup here.	470	* emulate part of the perl startup here.
590	*/	471	*/
		472
		473	coro_init_stacks ();
		474
		475	PL_curcop = 0;
		476	PL_in_eval = 0;
		477	PL_curpm = 0;
		478
		479	{
		480	dSP;
		481	LOGOP myop;
		482
		483	/* I have no idea why this is needed, but it is */
		484	PUSHMARK (SP);
		485
		486	SvREFCNT_dec (GvAV (PL_defgv));
		487	GvAV (PL_defgv) = coro->args; coro->args = 0;
		488
		489	Zero (&myop, 1, LOGOP);
		490	myop.op_next = Nullop;
		491	myop.op_flags = OPf_WANT_VOID;
		492
		493	PL_op = (OP *)&myop;
		494
		495	PUSHMARK (SP);
		496	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		497	PUTBACK;
		498	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		499	SPAGAIN;
		500
		501	ENTER; /* necessary e.g. for dounwind */
		502	}
		503	}
		504
		505	static void
		506	free_coro_mortal ()
		507	{
		508	if (coro_mortal)
		509	{
		510	SvREFCNT_dec (coro_mortal);
		511	coro_mortal = 0;
		512	}
		513	}
		514
		515	static void NOINLINE
		516	prepare_cctx (coro_cctx *cctx)
		517	{
591	dSP;	518	dSP;
592	Coro__State ctx = (Coro__State)arg;	519	LOGOP myop;
593	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
594		520
595	coro_init_stacks (aTHX);	521	Zero (&myop, 1, LOGOP);
596	/*PL_curcop = 0;*/	522	myop.op_next = PL_op;
597	/*PL_in_eval = PL_in_eval;*/ /* inherit */	523	myop.op_flags = OPf_WANT_VOID;
598	SvREFCNT_dec (GvAV (PL_defgv));
599	GvAV (PL_defgv) = ctx->args;
600		524
		525	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		526
		527	PUSHMARK (SP);
		528	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		529	PUTBACK;
		530	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
601	SPAGAIN;	531	SPAGAIN;
602
603	if (ctx->stack)
604	{
605	ctx->cursp = 0;
606
607	PUSHMARK(SP);
608	PUTBACK;
609	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
610
611	if (SvTRUE (ERRSV))
612	croak (NULL);
613	else
614	croak ("FATAL: CCTXT coroutine returned!");
615	}
616	else
617	{
618	UNOP myop;
619
620	PL_op = (OP *)&myop;
621
622	Zero(&myop, 1, UNOP);
623	myop.op_next = Nullop;
624	myop.op_flags = OPf_WANT_VOID;
625
626	PUSHMARK(SP);
627	XPUSHs (sub_init);
628	/*
629	* the next line is slightly wrong, as PL_op->op_next
630	* is actually being executed so we skip the first op.
631	* that doesn't matter, though, since it is only
632	* pp_nextstate and we never return...
633	* ah yes, and I don't care anyways ;)
634	*/
635	PUTBACK;
636	PL_op = pp_entersub();
637	SPAGAIN;
638
639	ENTER; /* necessary e.g. for dounwind */
640	}
641	}	532	}
642		533
643	static void	534	static void
644	continue_coro (void *arg)	535	coro_run (void *arg)
645	{	536	{
		537	/* coro_run is the alternative epilogue of transfer() */
		538	UNLOCK;
		539
646	/*	540	/*
647	* this is a _very_ stripped down perl interpreter ;)	541	* this is a _very_ stripped down perl interpreter ;)
648	*/	542	*/
649	Coro__State ctx = (Coro__State)arg;	543	PL_top_env = &PL_start_env;
650		544
651	/*FIXME*//* must set up top_env here */	545	/* inject call to cctx_init */
652	ctx->cursp = 0;	546	prepare_cctx ((coro_cctx *)arg);
653	PL_op = PL_op->op_next;
654	CALLRUNOPS(aTHX);
655		547
		548	/* somebody will hit me for both perl_run and PL_restartop */
		549	perl_run (PL_curinterp);
		550
		551	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
656	abort ();	552	abort ();
657	}	553	}
658		554
659	STATIC void	555	static coro_cctx *
		556	cctx_new ()
		557	{
		558	coro_cctx *cctx;
		559
		560	++cctx_count;
		561
		562	New (0, cctx, 1, coro_cctx);
		563
		564	#if HAVE_MMAP
		565
		566	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		567	/* mmap suppsedly does allocate-on-write for us */
		568	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		569
		570	if (cctx->sptr == (void *)-1)
		571	{
		572	perror ("FATAL: unable to mmap stack for coroutine");
		573	_exit (EXIT_FAILURE);
		574	}
		575
		576	# if STACKGUARD
		577	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		578	# endif
		579
		580	#else
		581
		582	cctx->ssize = STACKSIZE * (long)sizeof (long);
		583	New (0, cctx->sptr, STACKSIZE, long);
		584
		585	if (!cctx->sptr)
		586	{
		587	perror ("FATAL: unable to malloc stack for coroutine");
		588	_exit (EXIT_FAILURE);
		589	}
		590
		591	#endif
		592
		593	#if USE_VALGRIND
		594	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		595	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		596	cctx->ssize + (char *)cctx->sptr
		597	);
		598	#endif
		599
		600	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		601
		602	return cctx;
		603	}
		604
		605	static void
		606	cctx_free (coro_cctx *cctx)
		607	{
		608	if (!cctx)
		609	return;
		610
		611	--cctx_count;
		612
		613	#if USE_VALGRIND
		614	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		615	#endif
		616
		617	#if HAVE_MMAP
		618	munmap (cctx->sptr, cctx->ssize);
		619	#else
		620	Safefree (cctx->sptr);
		621	#endif
		622
		623	Safefree (cctx);
		624	}
		625
		626	static coro_cctx *
		627	cctx_get ()
		628	{
		629	coro_cctx *cctx;
		630
		631	if (cctx_first)
		632	{
		633	--cctx_idle;
		634	cctx = cctx_first;
		635	cctx_first = cctx->next;
		636	}
		637	else
		638	{
		639	cctx = cctx_new ();
		640	PL_op = PL_op->op_next;
		641	}
		642
		643	return cctx;
		644	}
		645
		646	static void
		647	cctx_put (coro_cctx *cctx)
		648	{
		649	++cctx_idle;
		650	cctx->next = cctx_first;
		651	cctx_first = cctx;
		652	}
		653
		654	/* never call directly, always through the coro_state_transfer global variable */
		655	static void NOINLINE
660	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	656	transfer (struct coro *prev, struct coro *next, int flags)
661	{	657	{
662	dSTACKLEVEL;	658	dSTACKLEVEL;
663	static struct coro *xnext;
664		659
665	printf ("%p => %p\n", prev, next);/*D*/	660	/* sometimes transfer is only called to set idle_sp */
		661	if (flags == TRANSFER_SET_STACKLEVEL)
		662	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
666	if (prev != next)	663	else if (prev != next)
667	{	664	{
668	xnext = next;	665	coro_cctx *prev__cctx;
		666
		667	LOCK;
669		668
670	if (next->mainstack)	669	if (next->mainstack)
671	{	670	{
		671	/* coroutine already started */
672	SAVE (prev, flags);	672	SAVE (prev, flags);
673	LOAD (next);	673	LOAD (next);
674
675	/* mark this state as in-use */
676	next->mainstack = 0;
677	next->tmps_ix = -2;
678
679	/* stacklevel changed? if yes, grab the stack for us! */
680	if (flags & TRANSFER_SAVE_CCTXT)
681	{
682	if (!prev->stack)
683	allocate_stack (prev, 0);
684	else if (prev->cursp != stacklevel
685	&& prev->stack->usecnt > 1)
686	{
687	prev->gencnt = ++prev->stack->gencnt;
688	prev->stack->usecnt = 1;
689	}
690
691	/* has our stack been invalidated? */
692	if (next->stack && next->stack->gencnt != next->gencnt)
693	{
694	deallocate_stack (next);
695	allocate_stack (next, 1);
696	coro_create (&(next->stack->cctx),
697	continue_coro, (void *)next,
698	next->stack->sptr, labs (next->stack->ssize));
699	}
700
701	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
702	/* don't add any code here */
703	}
704
705	}	674	}
706	else if (next->tmps_ix == -2)
707	croak ("tried to transfer to running coroutine");
708	else	675	else
709	{	676	{
		677	/* need to start coroutine */
710	SAVE (prev, -1); /* first get rid of the old state */	678	/* first get rid of the old state */
711		679	SAVE (prev, -1);
712	if (flags & TRANSFER_SAVE_CCTXT)	680	/* setup coroutine call */
713	{
714	if (!prev->stack)
715	allocate_stack (prev, 0);
716
717	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
718	{
719	setup_coro (next);
720
721	prev->stack->refcnt++;
722	prev->stack->usecnt++;
723	next->stack = prev->stack;
724	next->gencnt = prev->gencnt;
725	}
726	else
727	{
728	allocate_stack (next, 1);
729	coro_create (&(next->stack->cctx),
730	setup_coro, (void *)next,
731	next->stack->sptr, labs (next->stack->ssize));
732	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
733	/* don't add any code here */
734	}
735	}
736	else
737	setup_coro (next);	681	setup_coro (next);
		682	/* need a stack */
		683	next->cctx = 0;
738	}	684	}
		685
		686	if (!prev->cctx)
		687	/* create a new empty context */
		688	Newz (0, prev->cctx, 1, coro_cctx);
		689
		690	prev__cctx = prev->cctx;
		691
		692	/* possibly "free" the cctx */
		693	if (prev__cctx->idle_sp == STACKLEVEL)
		694	{
		695	cctx_put (prev__cctx);
		696	prev->cctx = 0;
		697	}
		698
		699	if (!next->cctx)
		700	next->cctx = cctx_get ();
		701
		702	if (prev__cctx != next->cctx)
		703	{
		704	prev__cctx->top_env = PL_top_env;
		705	PL_top_env = next->cctx->top_env;
		706	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		707	}
		708
		709	free_coro_mortal ();
		710
		711	UNLOCK;
739	}	712	}
740
741	xnext->cursp = stacklevel;
742	}	713	}
		714
		715	struct transfer_args
		716	{
		717	struct coro *prev, *next;
		718	int flags;
		719	};
		720
		721	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		722
		723	static void
		724	coro_state_destroy (struct coro *coro)
		725	{
		726	if (coro->refcnt--)
		727	return;
		728
		729	if (coro->mainstack && coro->mainstack != main_mainstack)
		730	{
		731	struct coro temp;
		732
		733	SAVE ((&temp), TRANSFER_SAVE_ALL);
		734	LOAD (coro);
		735
		736	coro_destroy_stacks ();
		737
		738	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		739
		740	coro->mainstack = 0;
		741	}
		742
		743	cctx_free (coro->cctx);
		744	SvREFCNT_dec (coro->args);
		745	Safefree (coro);
		746	}
		747
		748	static int
		749	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		750	{
		751	struct coro *coro = (struct coro *)mg->mg_ptr;
		752	mg->mg_ptr = 0;
		753
		754	coro_state_destroy (coro);
		755
		756	return 0;
		757	}
		758
		759	static int
		760	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		761	{
		762	struct coro *coro = (struct coro *)mg->mg_ptr;
		763
		764	++coro->refcnt;
		765
		766	return 0;
		767	}
		768
		769	static MGVTBL coro_state_vtbl = {
		770	0, 0, 0, 0,
		771	coro_state_clear,
		772	0,
		773	#ifdef MGf_DUP
		774	coro_state_dup,
		775	#else
		776	# define MGf_DUP 0
		777	#endif
		778	};
743		779
744	static struct coro *	780	static struct coro *
745	sv_to_coro (SV *arg, const char *funcname, const char *varname)	781	SvSTATE (SV *coro)
746	{	782	{
747	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	783	HV *stash;
		784	MAGIC *mg;
		785
		786	if (SvROK (coro))
		787	coro = SvRV (coro);
		788
		789	stash = SvSTASH (coro);
		790	if (stash != coro_stash && stash != coro_state_stash)
748	{	791	{
749	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	792	/* very slow, but rare, check */
750		793	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
751	if (!he)	794	croak ("Coro::State object required");
752	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
753
754	arg = HeVAL(he);
755	}	795	}
756
757	/* must also be changed inside Coro::Cont::yield */
758	if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
759	return (struct coro *) SvIV((SV*)SvRV(arg));
760		796
761	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	797	mg = SvMAGIC (coro);
762	/*NORETURN*/	798	assert (mg->mg_type == PERL_MAGIC_ext);
		799	return (struct coro *)mg->mg_ptr;
763	}	800	}
764		801
765	static void	802	static void
		803	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		804	{
		805	ta->prev = SvSTATE (prev);
		806	ta->next = SvSTATE (next);
		807	ta->flags = flags;
		808	}
		809
		810	static void
766	api_transfer(pTHX_ SV *prev, SV *next, int flags)	811	api_transfer (SV *prev, SV *next, int flags)
767	{	812	{
768	transfer(aTHX_	813	dTHX;
769	sv_to_coro (prev, "Coro::transfer", "prev"),	814	struct transfer_args ta;
770	sv_to_coro (next, "Coro::transfer", "next"),	815
771	flags);	816	prepare_transfer (&ta, prev, next, flags);
		817	TRANSFER (ta);
772	}	818	}
773		819
774	/** Coro ********************************************************************/	820	/** Coro ********************************************************************/
775		821
776	#define PRIO_MAX 3	822	#define PRIO_MAX 3
…		…
780	#define PRIO_IDLE -3	826	#define PRIO_IDLE -3
781	#define PRIO_MIN -4	827	#define PRIO_MIN -4
782		828
783	/* for Coro.pm */	829	/* for Coro.pm */
784	static GV *coro_current, *coro_idle;	830	static GV *coro_current, *coro_idle;
785	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	831	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
786	static int coro_nready;	832	static int coro_nready;
787		833
788	static void	834	static void
789	coro_enq (SV *sv)	835	coro_enq (SV *sv)
790	{	836	{
791	if (SvROK (sv))	837	int prio;
792	{	838
793	SV *hv = SvRV (sv);
794	if (SvTYPE (hv) == SVt_PVHV)	839	if (SvTYPE (sv) != SVt_PVHV)
795	{
796	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
797	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
798
799	prio = prio > PRIO_MAX ? PRIO_MAX
800	: prio < PRIO_MIN ? PRIO_MIN
801	: prio;
802
803	av_push (coro_ready [prio - PRIO_MIN], sv);
804	coro_nready++;
805
806	return;
807	}
808	}
809
810	croak ("Coro::ready tried to enqueue something that is not a coroutine");	840	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		841
		842	prio = SvSTATE (sv)->prio;
		843
		844	av_push (coro_ready [prio - PRIO_MIN], sv);
		845	coro_nready++;
811	}	846	}
812		847
813	static SV *	848	static SV *
814	coro_deq (int min_prio)	849	coro_deq (int min_prio)
815	{	850	{
…		…
818	min_prio -= PRIO_MIN;	853	min_prio -= PRIO_MIN;
819	if (min_prio < 0)	854	if (min_prio < 0)
820	min_prio = 0;	855	min_prio = 0;
821		856
822	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	857	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
823	if (av_len (coro_ready[prio]) >= 0)	858	if (AvFILLp (coro_ready [prio]) >= 0)
824	{	859	{
825	coro_nready--;	860	coro_nready--;
826	return av_shift (coro_ready[prio]);	861	return av_shift (coro_ready [prio]);
827	}	862	}
828		863
829	return 0;	864	return 0;
830	}	865	}
831		866
832	static void	867	static void
833	api_ready (SV *coro)	868	api_ready (SV *coro)
834	{	869	{
		870	dTHX;
		871
		872	if (SvROK (coro))
		873	coro = SvRV (coro);
		874
		875	LOCK;
835	coro_enq (SvREFCNT_inc (coro));	876	coro_enq (SvREFCNT_inc (coro));
		877	UNLOCK;
836	}	878	}
837		879
838	static void	880	static void
839	api_schedule (int cede)	881	prepare_schedule (struct transfer_args *ta)
840	{	882	{
841	SV *prev, *next;	883	SV *current, *prev, *next;
842		884
843	prev = GvSV (coro_current);	885	current = GvSV (coro_current);
844		886
845	if (cede)	887	for (;;)
846	coro_enq (SvREFCNT_inc (prev));	888	{
847		889	LOCK;
848	next = coro_deq (PRIO_MIN);	890	next = coro_deq (PRIO_MIN);
		891	UNLOCK;
849		892
850	if (!next)	893	if (next)
851	next = SvREFCNT_inc (GvSV (coro_idle));	894	break;
852		895
853	GvSV (coro_current) = SvREFCNT_inc (next);	896	{
854	transfer (aTHX_	897	dSP;
855	sv_to_coro (prev, "Coro::schedule", "current coroutine"),	898
856	sv_to_coro (next, "Coro::schedule", "next coroutine"),	899	ENTER;
857	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	900	SAVETMPS;
858	SvREFCNT_dec (next);	901
859	SvREFCNT_dec (prev);	902	PUSHMARK (SP);
		903	PUTBACK;
		904	call_sv (GvSV (coro_idle), G_DISCARD);
		905
		906	FREETMPS;
		907	LEAVE;
		908	}
		909	}
		910
		911	prev = SvRV (current);
		912	SvRV (current) = next;
		913
		914	/* free this only after the transfer */
		915	LOCK;
		916	free_coro_mortal ();
		917	UNLOCK;
		918	coro_mortal = prev;
		919
		920	ta->prev = SvSTATE (prev);
		921	ta->next = SvSTATE (next);
		922	ta->flags = TRANSFER_SAVE_ALL;
		923	}
		924
		925	static void
		926	prepare_cede (struct transfer_args *ta)
		927	{
		928	LOCK;
		929	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
		930	UNLOCK;
		931
		932	prepare_schedule (ta);
		933	}
		934
		935	static void
		936	api_schedule (void)
		937	{
		938	dTHX;
		939	struct transfer_args ta;
		940
		941	prepare_schedule (&ta);
		942	TRANSFER (ta);
		943	}
		944
		945	static void
		946	api_cede (void)
		947	{
		948	dTHX;
		949	struct transfer_args ta;
		950
		951	prepare_cede (&ta);
		952	TRANSFER (ta);
860	}	953	}
861		954
862	MODULE = Coro::State PACKAGE = Coro::State	955	MODULE = Coro::State PACKAGE = Coro::State
863		956
864	PROTOTYPES: ENABLE	957	PROTOTYPES: DISABLE
865		958
866	BOOT:	959	BOOT:
867	{ /* {} necessary for stoopid perl-5.6.x */	960	{
868	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	961	#ifdef USE_ITHREADS
869	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	962	MUTEX_INIT (&coro_mutex);
		963	#endif
		964	BOOT_PAGESIZE;
		965
870	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	966	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
871		967
872	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	968	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
873	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	969	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
874	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	970	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
875	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
876
877	if (!padlist_cache)
878	padlist_cache = newHV ();
879		971
880	main_mainstack = PL_mainstack;	972	main_mainstack = PL_mainstack;
881		973
882	coroapi.ver = CORO_API_VERSION;	974	coroapi.ver = CORO_API_VERSION;
883	coroapi.transfer = api_transfer;	975	coroapi.transfer = api_transfer;
884	}
885		976
886	Coro::State	977	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
887	_newprocess(args)	978	}
888	SV * args	979
889	PROTOTYPE: $	980	SV *
		981	new (char *klass, ...)
890	CODE:	982	CODE:
891	Coro__State coro;	983	{
		984	struct coro *coro;
		985	HV *hv;
		986	int i;
892		987
893	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
894	croak ("Coro::State::_newprocess expects an arrayref");
895
896	New (0, coro, 1, struct coro);	988	Newz (0, coro, 1, struct coro);
		989	coro->args = newAV ();
897		990
898	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	991	hv = newHV ();
899	coro->mainstack = 0; /* actual work is done inside transfer */	992	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
900	coro->stack = 0;	993	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
901		994
902	RETVAL = coro;	995	for (i = 1; i < items; i++)
		996	av_push (coro->args, newSVsv (ST (i)));
		997	}
903	OUTPUT:	998	OUTPUT:
904	RETVAL	999	RETVAL
905		1000
906	void	1001	void
907	transfer(prev, next, flags)	1002	_set_stacklevel (...)
908	Coro::State_or_hashref prev	1003	ALIAS:
909	Coro::State_or_hashref next	1004	Coro::State::transfer = 1
910	int flags	1005	Coro::schedule = 2
911	PROTOTYPE: @	1006	Coro::cede = 3
		1007	Coro::Cont::yield = 4
912	CODE:	1008	CODE:
913	PUTBACK;	1009	{
914	transfer (aTHX_ prev, next, flags);	1010	struct transfer_args ta;
915	SPAGAIN;	1011
		1012	switch (ix)
		1013	{
		1014	case 0:
		1015	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1016	ta.next = 0;
		1017	ta.flags = TRANSFER_SET_STACKLEVEL;
		1018	break;
		1019
		1020	case 1:
		1021	if (items != 3)
		1022	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1023
		1024	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1025	break;
		1026
		1027	case 2:
		1028	prepare_schedule (&ta);
		1029	break;
		1030
		1031	case 3:
		1032	prepare_cede (&ta);
		1033	break;
		1034
		1035	case 4:
		1036	{
		1037	SV *yieldstack;
		1038	SV *sv;
		1039	AV *defav = GvAV (PL_defgv);
		1040
		1041	yieldstack = *hv_fetch (
		1042	(HV *)SvRV (GvSV (coro_current)),
		1043	"yieldstack", sizeof ("yieldstack") - 1,
		1044	0
		1045	);
		1046
		1047	/* set up @_ -- ugly */
		1048	av_clear (defav);
		1049	av_fill (defav, items - 1);
		1050	while (items--)
		1051	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1052
		1053	sv = av_pop ((AV *)SvRV (yieldstack));
		1054	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1055	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1056	ta.flags = 0;
		1057	SvREFCNT_dec (sv);
		1058	}
		1059	break;
		1060
		1061	}
		1062
		1063	TRANSFER (ta);
		1064	}
916		1065
917	void	1066	void
918	DESTROY(coro)	1067	_clone_state_from (SV *dst, SV *src)
919	Coro::State coro	1068	CODE:
920	CODE:	1069	{
		1070	struct coro *coro_src = SvSTATE (src);
921		1071
922	if (coro->mainstack && coro->mainstack != main_mainstack)	1072	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
923	{
924	struct coro temp;
925		1073
926	PUTBACK;	1074	++coro_src->refcnt;
927	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1075	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
928	LOAD(aTHX_ coro);	1076	}
929	SPAGAIN;
930
931	destroy_stacks (aTHX);
932
933	LOAD((&temp)); /* this will get rid of defsv etc.. */
934	SPAGAIN;
935
936	coro->mainstack = 0;
937	}
938
939	deallocate_stack (coro);
940
941	Safefree (coro);
942		1077
943	void	1078	void
944	flush()
945	CODE:
946	#ifdef MAY_FLUSH
947	flush_padlist_cache ();
948	#endif
949
950	void
951	_exit(code)	1079	_exit (code)
952	int code	1080	int code
953	PROTOTYPE: $	1081	PROTOTYPE: $
954	CODE:	1082	CODE:
955	#if defined(__GLIBC__) || _POSIX_C_SOURCE
956	_exit (code);	1083	_exit (code);
957	#else
958	signal (SIGTERM, SIG_DFL);
959	raise (SIGTERM);
960	exit (code);
961	#endif
962		1084
963	MODULE = Coro::State PACKAGE = Coro::Cont	1085	int
		1086	cctx_count ()
		1087	CODE:
		1088	RETVAL = cctx_count;
		1089	OUTPUT:
		1090	RETVAL
964		1091
965	# this is slightly dirty (should expose a c-level api)	1092	int
966		1093	cctx_idle ()
967	void	1094	CODE:
968	yield(...)	1095	RETVAL = cctx_idle;
969	PROTOTYPE: @	1096	OUTPUT:
970	CODE:	1097	RETVAL
971	static SV *returnstk;
972	SV *sv;
973	AV *defav = GvAV (PL_defgv);
974	struct coro *prev, *next;
975
976	if (!returnstk)
977	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
978
979	/* set up @_ -- ugly */
980	av_clear (defav);
981	av_fill (defav, items - 1);
982	while (items--)
983	av_store (defav, items, SvREFCNT_inc (ST(items)));
984
985	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
986	sv = av_pop ((AV *)SvRV (returnstk));
987	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
988	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
989	SvREFCNT_dec (sv);
990
991	transfer(aTHX_ prev, next, 0);
992		1098
993	MODULE = Coro::State PACKAGE = Coro	1099	MODULE = Coro::State PACKAGE = Coro
994		1100
995	# this is slightly dirty (should expose a c-level api)
996
997	BOOT:	1101	BOOT:
998	{	1102	{
999	int i;	1103	int i;
		1104
1000	HV *stash = gv_stashpv ("Coro", TRUE);	1105	coro_stash = gv_stashpv ("Coro", TRUE);
1001		1106
1002	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1107	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1003	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1108	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1004	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1109	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1005	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1110	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1006	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1111	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1007	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1112	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1008		1113
1009	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1114	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1010	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1115	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1011		1116
1012	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1117	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1014		1119
1015	{	1120	{
1016	SV *sv = perl_get_sv("Coro::API", 1);	1121	SV *sv = perl_get_sv("Coro::API", 1);
1017		1122
1018	coroapi.schedule = api_schedule;	1123	coroapi.schedule = api_schedule;
		1124	coroapi.cede = api_cede;
1019	coroapi.ready = api_ready;	1125	coroapi.ready = api_ready;
1020	coroapi.nready = &coro_nready;	1126	coroapi.nready = &coro_nready;
1021	coroapi.current = coro_current;	1127	coroapi.current = coro_current;
1022		1128
1023	GCoroAPI = &coroapi;	1129	GCoroAPI = &coroapi;
1024	sv_setiv(sv, (IV)&coroapi);	1130	sv_setiv (sv, (IV)&coroapi);
1025	SvREADONLY_on(sv);	1131	SvREADONLY_on (sv);
1026	}	1132	}
1027	}	1133	}
1028		1134
		1135	int
		1136	prio (Coro::State coro, int newprio = 0)
		1137	ALIAS:
		1138	nice = 1
		1139	CODE:
		1140	{
		1141	RETVAL = coro->prio;
		1142
		1143	if (items > 1)
		1144	{
		1145	if (ix)
		1146	newprio += coro->prio;
		1147
		1148	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1149	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1150
		1151	coro->prio = newprio;
		1152	}
		1153	}
		1154
1029	void	1155	void
1030	ready(self)	1156	ready (SV *self)
1031	SV * self	1157	PROTOTYPE: $
1032	CODE:	1158	CODE:
1033	api_ready (self);	1159	api_ready (self);
1034		1160
1035	int	1161	int
1036	nready(...)	1162	nready (...)
1037	PROTOTYPE:	1163	PROTOTYPE:
1038	CODE:	1164	CODE:
1039	RETVAL = coro_nready;	1165	RETVAL = coro_nready;
1040	OUTPUT:	1166	OUTPUT:
1041	RETVAL	1167	RETVAL
1042		1168
		1169	MODULE = Coro::State PACKAGE = Coro::AIO
		1170
		1171	SV *
		1172	_get_state ()
		1173	CODE:
		1174	{
		1175	struct {
		1176	int errorno;
		1177	int laststype;
		1178	int laststatval;
		1179	Stat_t statcache;
		1180	} data;
		1181
		1182	data.errorno = errno;
		1183	data.laststype = PL_laststype;
		1184	data.laststatval = PL_laststatval;
		1185	data.statcache = PL_statcache;
		1186
		1187	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1188	}
		1189	OUTPUT:
		1190	RETVAL
		1191
1043	void	1192	void
1044	schedule(...)	1193	_set_state (char *data_)
1045	PROTOTYPE:	1194	PROTOTYPE: $
1046	ALIAS:
1047	cede = 1
1048	CODE:	1195	CODE:
1049	api_schedule (ix);	1196	{
		1197	struct {
		1198	int errorno;
		1199	int laststype;
		1200	int laststatval;
		1201	Stat_t statcache;
		1202	} *data = (void *)data_;
1050		1203
		1204	errno = data->errorno;
		1205	PL_laststype = data->laststype;
		1206	PL_laststatval = data->laststatval;
		1207	PL_statcache = data->statcache;
		1208	}

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