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Comparing Coro/Coro/State.xs (file contents):
Revision 1.19 by root, Sun Jul 29 01:11:41 2001 UTC vs.
Revision 1.125 by root, Mon Dec 11 20:54:45 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
		23	# ifndef PL_ppaddr
		24	# define PL_ppaddr ppaddr
		25	# endif
		26	# ifndef call_sv
		27	# define call_sv perl_call_sv
		28	# endif
		29	# ifndef get_sv
		30	# define get_sv perl_get_sv
		31	# endif
		32	# ifndef get_cv
		33	# define get_cv perl_get_cv
		34	# endif
		35	# ifndef IS_PADGV
		36	# define IS_PADGV(v) 0
		37	# endif
		38	# ifndef IS_PADCONST
		39	# define IS_PADCONST(v) 0
		40	# endif
		41	#endif
		42
		43	/* 5.8.7 */
		44	#ifndef SvRV_set
		45	# define SvRV_set(s,v) SvRV(s) = (v)
		46	#endif
		47
		48	#include <stdio.h>
		49	#include <errno.h>
		50	#include <assert.h>
		51
		52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		53	# undef STACKGUARD
		54	#endif
		55
		56	#ifndef STACKGUARD
		57	# define STACKGUARD 0
		58	#endif
6		59
7	#ifdef HAVE_MMAP	60	#ifdef HAVE_MMAP
8	# include <unistd.h>	61	# include <unistd.h>
9	# include <sys/mman.h>	62	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	63	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	64	# ifdef MAP_ANON
		65	# define MAP_ANONYMOUS MAP_ANON
13	# else	66	# else
14	# undef HAVE_MMAP	67	# undef HAVE_MMAP
15	# endif	68	# endif
16	# endif	69	# endif
		70	# include <limits.h>
		71	# ifndef PAGESIZE
		72	# define PAGESIZE pagesize
		73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		74	static long pagesize;
		75	# else
		76	# define BOOT_PAGESIZE (void)0
17	#endif	77	# endif
18
19	#define MAY_FLUSH /* increases codesize */
20
21	/* perl-related */
22	#define TRANSFER_SAVE_DEFAV 0x00000001
23	#define TRANSFER_SAVE_DEFSV 0x00000002
24	#define TRANSFER_SAVE_ERRSV 0x00000004
25	/* c-related */
26	#define TRANSFER_SAVE_CCTXT 0x00000008
27	#ifdef CORO_LAZY_STACK
28	# define TRANSFER_LAZY_STACK 0x00000010
29	#else	78	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	79	# define PAGESIZE 0
		80	# define BOOT_PAGESIZE (void)0
31	#endif	81	#endif
32		82
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
35
36	#define SUB_INIT "Coro::State::initialize"
37	#define UCORO_STATE "_coro_state"
38
39	/* The next macro should delcare a variable stacklevel that contains and approximation	83	/* The next macro should declare a variable stacklevel that contains and approximation
40	* to the current C stack pointer. It's property is that it changes with each call	84	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	85	* and should be unique. */
		86	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	87	#define STACKLEVEL ((void *)&stacklevel)
43		88
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		90
46	/* this is actually not only the c stack but also c registers etc... */	91	#if __GNUC__ >= 3
		92	# define attribute(x) __attribute__(x)
		93	#else
		94	# define attribute(x)
		95	#endif
		96
		97	#define NOINLINE attribute ((noinline))
		98
		99	#include "CoroAPI.h"
		100
		101	#ifdef USE_ITHREADS
		102	static perl_mutex coro_mutex;
		103	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		104	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		105	#else
		106	# define LOCK (void)0
		107	# define UNLOCK (void)0
		108	#endif
		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
		118	static struct CoroAPI coroapi;
		119	static AV *main_mainstack; /* used to differentiate between $main and others */
		120	static HV *coro_state_stash, *coro_stash;
		121	static SV *coro_mortal; /* will be freed after next transfer */
		122
		123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
		126	/* this is a structure representing a c-level coroutine */
47	typedef struct {	127	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	128	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		129
52	coro_context cctx;	130	/* the stack */
53
54	void *sptr;	131	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		133
		134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
		137	coro_context cctx;
		138
		139	int inuse;
		140
		141	#if USE_VALGRIND
		142	int valgrind_id;
		143	#endif
		144	} coro_cctx;
		145
		146	enum {
		147	CF_RUNNING = 0x0001, /* coroutine is running */
		148	CF_READY = 0x0002, /* coroutine is ready */
		149	CF_NEW = 0x0004, /* ahs never been switched to */
		150	};
		151
		152	/* this is a structure representing a perl-level coroutine */
58	struct coro {	153	struct coro {
59	/* the optional C context */	154	/* the c coroutine allocated to this perl coroutine, if any */
60	coro_stack *stack;	155	coro_cctx *cctx;
61	void *cursp;
62	int gencnt;
63
64	/* optionally saved, might be zero */
65	AV *defav;
66	SV *defsv;
67	SV *errsv;
68
69	/* saved global state not related to stacks */
70	U8 dowarn;
71	I32 in_eval;
72
73	/* the stacks and related info (callchain etc..) */
74	PERL_SI *curstackinfo;
75	AV *curstack;
76	AV *mainstack;
77	SV **stack_sp;
78	OP *op;
79	SV **curpad;
80	SV **stack_base;
81	SV **stack_max;
82	SV **tmps_stack;
83	I32 tmps_floor;
84	I32 tmps_ix;
85	I32 tmps_max;
86	I32 *markstack;
87	I32 *markstack_ptr;
88	I32 *markstack_max;
89	I32 *scopestack;
90	I32 scopestack_ix;
91	I32 scopestack_max;
92	ANY *savestack;
93	I32 savestack_ix;
94	I32 savestack_max;
95	OP **retstack;
96	I32 retstack_ix;
97	I32 retstack_max;
98	COP *curcop;
99	JMPENV *top_env;
100		156
101	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
102	AV *args;	158	AV *args;
		159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
		162
		163	/* optionally saved, might be zero */
		164	AV *defav; /* @_ */
		165	SV *defsv; /* $_ */
		166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
		169
		170	#define VAR(name,type) type name;
		171	# include "state.h"
		172	#undef VAR
		173
		174	/* coro process data */
		175	int prio;
103	};	176	};
104		177
105	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
106	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
107		180
108	static AV *main_mainstack; /* used to differentiate between $main and others */	181	static AV *
109	static HV *coro_state_stash;	182	coro_clone_padlist (CV *cv)
110	static SV *ucoro_state_sv;
111	static U32 ucoro_state_hash;
112	static HV *padlist_cache;
113
114	/* mostly copied from op.c:cv_clone2 */
115	STATIC AV *
116	clone_padlist (AV *protopadlist)
117	{	183	{
118	AV *av;	184	AV *padlist = CvPADLIST (cv);
119	I32 ix;
120	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
121	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
122	SV **pname = AvARRAY (protopad_name);
123	SV **ppad = AvARRAY (protopad);
124	I32 fname = AvFILLp (protopad_name);
125	I32 fpad = AvFILLp (protopad);
126	AV *newpadlist, *newpad_name, *newpad;	185	AV *newpadlist, *newpad;
127	SV **npad;
128
129	newpad_name = newAV ();
130	for (ix = fname; ix >= 0; ix--)
131	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
132
133	newpad = newAV ();
134	av_fill (newpad, AvFILLp (protopad));
135	npad = AvARRAY (newpad);
136		186
137	newpadlist = newAV ();	187	newpadlist = newAV ();
138	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
139	av_store (newpadlist, 0, (SV *) newpad_name);	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
		192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		193	#endif
		194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		195	--AvFILLp (padlist);
		196
		197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
140	av_store (newpadlist, 1, (SV *) newpad);	198	av_store (newpadlist, 1, (SV *)newpad);
141		199
142	av = newAV (); /* will be @_ */	200	return newpadlist;
143	av_extend (av, 0);	201	}
144	av_store (newpad, 0, (SV *) av);
145	AvFLAGS (av) = AVf_REIFY;
146		202
147	for (ix = fpad; ix > 0; ix--)	203	static void
		204	free_padlist (AV *padlist)
		205	{
		206	/* may be during global destruction */
		207	if (SvREFCNT (padlist))
148	{	208	{
149	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	209	I32 i = AvFILLp (padlist);
150	if (namesv && namesv != &PL_sv_undef)	210	while (i >= 0)
151	{	211	{
152	char *name = SvPVX (namesv); /* XXX */	212	SV **svp = av_fetch (padlist, i--, FALSE);
153	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	213	if (svp)
154	{ /* lexical from outside? */
155	npad[ix] = SvREFCNT_inc (ppad[ix]);
156	}	214	{
157	else
158	{ /* our own lexical */
159	SV *sv;	215	SV *sv;
160	if (*name == '&')	216	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
161	sv = SvREFCNT_inc (ppad[ix]);	217	SvREFCNT_dec (sv);
162	else if (*name == '@')	218
163	sv = (SV *) newAV ();	219	SvREFCNT_dec (*svp);
164	else if (*name == '%')
165	sv = (SV *) newHV ();
166	else
167	sv = NEWSV (0, 0);
168	if (!SvPADBUSY (sv))
169	SvPADMY_on (sv);
170	npad[ix] = sv;
171	}	220	}
172	}	221	}
173	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	222
174	{	223	SvREFCNT_dec ((SV*)padlist);
175	npad[ix] = SvREFCNT_inc (ppad[ix]);
176	}
177	else
178	{
179	SV *sv = NEWSV (0, 0);
180	SvPADTMP_on (sv);
181	npad[ix] = sv;
182	}
183	}	224	}
		225	}
184		226
185	#if 0 /* return -ENOTUNDERSTOOD */	227	static int
186	/* Now that vars are all in place, clone nested closures. */	228	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		229	{
		230	AV *padlist;
		231	AV *av = (AV *)mg->mg_obj;
187		232
188	for (ix = fpad; ix > 0; ix--) {	233	/* casting is fun. */
189	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
190	if (namesv	235	free_padlist (padlist);
191	&& namesv != &PL_sv_undef	236
192	&& !(SvFLAGS(namesv) & SVf_FAKE)	237	SvREFCNT_dec (av);
193	&& *SvPVX(namesv) == '&'	238
194	&& CvCLONE(ppad[ix]))	239	return 0;
195	{	240	}
196	CV *kid = cv_clone((CV*)ppad[ix]);	241
197	SvREFCNT_dec(ppad[ix]);	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
198	CvCLONE_on(kid);	243
199	SvPADMY_on(kid);	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
200	npad[ix] = (SV*)kid;	245
201	}	246	#define CORO_MAGIC(cv) \
		247	SvMAGIC (cv) \
		248	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		249	? SvMAGIC (cv) \
		250	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		251	: 0
		252
		253	/* the next two functions merely cache the padlists */
		254	static void
		255	get_padlist (CV *cv)
		256	{
		257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
		259
		260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		262	else
		263	{
		264	#if 0
		265	/* this is probably cleaner, but also slower? */
		266	CV *cp = Perl_cv_clone (cv);
		267	CvPADLIST (cv) = CvPADLIST (cp);
		268	CvPADLIST (cp) = 0;
		269	SvREFCNT_dec (cp);
		270	#else
		271	CvPADLIST (cv) = coro_clone_padlist (cv);
		272	#endif
		273	}
		274	}
		275
		276	static void
		277	put_padlist (CV *cv)
		278	{
		279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
		281
		282	if (!mg)
		283	{
		284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		286	mg->mg_virtual = &vtbl_coro;
		287	mg->mg_obj = (SV *)newAV ();
202	}	288	}
203	#endif
204		289
205	return newpadlist;	290	av = (AV *)mg->mg_obj;
206	}
207		291
208	#ifdef MAY_FLUSH	292	if (AvFILLp (av) >= AvMAX (av))
209	STATIC AV *	293	av_extend (av, AvMAX (av) + 1);
210	free_padlist (AV *padlist)
211	{
212	/* may be during global destruction */
213	if (SvREFCNT(padlist))
214	{
215	I32 i = AvFILLp(padlist);
216	while (i >= 0)
217	{
218	SV **svp = av_fetch(padlist, i--, FALSE);
219	SV *sv = svp ? *svp : Nullsv;
220	if (sv)
221	SvREFCNT_dec(sv);
222	}
223		294
224	SvREFCNT_dec((SV*)padlist);	295	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
225	}
226	}	296	}
227	#endif
228
229	/* the next two functions merely cache the padlists */
230	STATIC void
231	get_padlist (CV *cv)
232	{
233	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
234
235	if (he && AvFILLp ((AV *)*he) >= 0)
236	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
237	else
238	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
239	}
240
241	STATIC void
242	put_padlist (CV *cv)
243	{
244	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
245
246	if (SvTYPE (*he) != SVt_PVAV)
247	{
248	SvREFCNT_dec (*he);
249	*he = (SV *)newAV ();
250	}
251
252	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
253	}
254
255	#ifdef MAY_FLUSH
256	STATIC void
257	flush_padlist_cache ()
258	{
259	HV *hv = padlist_cache;
260	padlist_cache = newHV ();
261
262	if (hv_iterinit (hv))
263	{
264	HE *he;
265	AV *padlist;
266
267	while (!!(he = hv_iternext (hv)))
268	{
269	AV *av = (AV *)HeVAL(he);
270
271	/* casting is fun. */
272	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
273	free_padlist (padlist);
274	}
275	}
276
277	SvREFCNT_dec (hv);
278	}
279	#endif
280		297
281	#define SB do {	298	#define SB do {
282	#define SE } while (0)	299	#define SE } while (0)
283		300
284	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
285	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
286
287	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	301	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
288		302
289	static void	303	static void
290	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
291	{	305	{
292	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
293	PL_in_eval = c->in_eval;	307	# include "state.h"
294		308	#undef VAR
295	PL_curstackinfo = c->curstackinfo;
296	PL_curstack = c->curstack;
297	PL_mainstack = c->mainstack;
298	PL_stack_sp = c->stack_sp;
299	PL_op = c->op;
300	PL_curpad = c->curpad;
301	PL_stack_base = c->stack_base;
302	PL_stack_max = c->stack_max;
303	PL_tmps_stack = c->tmps_stack;
304	PL_tmps_floor = c->tmps_floor;
305	PL_tmps_ix = c->tmps_ix;
306	PL_tmps_max = c->tmps_max;
307	PL_markstack = c->markstack;
308	PL_markstack_ptr = c->markstack_ptr;
309	PL_markstack_max = c->markstack_max;
310	PL_scopestack = c->scopestack;
311	PL_scopestack_ix = c->scopestack_ix;
312	PL_scopestack_max = c->scopestack_max;
313	PL_savestack = c->savestack;
314	PL_savestack_ix = c->savestack_ix;
315	PL_savestack_max = c->savestack_max;
316	PL_retstack = c->retstack;
317	PL_retstack_ix = c->retstack_ix;
318	PL_retstack_max = c->retstack_max;
319	PL_curcop = c->curcop;
320	PL_top_env = c->top_env;
321		309
322	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
323	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
324	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	312	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		313	if (c->irssv)
		314	{
		315	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		316	SvREFCNT_dec (c->irssv);
		317	else
		318	{
		319	REPLACE_SV (PL_rs, c->irssv);
		320	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		321	sv_setsv (c->irssv_sv, PL_rs);
		322	}
		323	}
325		324
326	{	325	{
327	dSP;	326	dSP;
328	CV *cv;	327	CV *cv;
329		328
330	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
331	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
332	{	331	{
333	AV *padlist = (AV *)POPs;
334
335	if (padlist)
336	{
337	put_padlist (cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
338	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
339	#ifdef USE_THREADS	334	CvPADLIST (cv) = (AV *)POPs;
340	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
341	#endif
342	}
343
344	++CvDEPTH(cv);
345	}	335	}
346		336
347	PUTBACK;	337	PUTBACK;
348	}	338	}
349	}	339	}
350		340
351	static void	341	static void
352	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
353	{	343	{
354	{	344	{
355	dSP;	345	dSP;
356	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
357	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
364		354
365	PUSHs (Nullsv);	355	PUSHs (Nullsv);
366	/* this loop was inspired by pp_caller */	356	/* this loop was inspired by pp_caller */
367	for (;;)	357	for (;;)
368	{	358	{
369	do	359	while (cxix >= 0)
370	{	360	{
371	PERL_CONTEXT *cx = &ccstk[cxix--];	361	PERL_CONTEXT *cx = &ccstk[cxix--];
372		362
373	if (CxTYPE(cx) == CXt_SUB)	363	if (CxTYPE (cx) == CXt_SUB)
374	{	364	{
375	CV *cv = cx->blk_sub.cv;	365	CV *cv = cx->blk_sub.cv;
		366
376	if (CvDEPTH(cv))	367	if (CvDEPTH (cv))
377	{	368	{
378	#ifdef USE_THREADS
379	/*XPUSHs ((SV *)CvOWNER(cv));*/
380	/*CvOWNER(cv) = 0;*/
381	/*error must unlock this cv etc.. etc...*/
382	#endif
383	EXTEND (SP, CvDEPTH(cv)*2);	369	EXTEND (SP, 3);
384		370
385	while (--CvDEPTH(cv))
386	{
387	/* this tells the restore code to increment CvDEPTH */
388	PUSHs (Nullsv);
389	PUSHs ((SV *)cv);
390	}
391
392	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
393	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
394		374
		375	CvDEPTH (cv) = 0;
395	get_padlist (cv); /* this is a monster */	376	get_padlist (cv);
396	}	377	}
397	}	378	}
		379	#ifdef CXt_FORMAT
398	else if (CxTYPE(cx) == CXt_FORMAT)	380	else if (CxTYPE (cx) == CXt_FORMAT)
399	{	381	{
400	/* I never used formats, so how should I know how these are implemented? */	382	/* I never used formats, so how should I know how these are implemented? */
401	/* my bold guess is as a simple, plain sub... */	383	/* my bold guess is as a simple, plain sub... */
402	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	384	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
403	}	385	}
		386	#endif
404	}	387	}
405	while (cxix >= 0);
406		388
407	if (top_si->si_type == PERLSI_MAIN)	389	if (top_si->si_type == PERLSI_MAIN)
408	break;	390	break;
409		391
410	top_si = top_si->si_prev;	392	top_si = top_si->si_prev;
…		…
413	}	395	}
414		396
415	PUTBACK;	397	PUTBACK;
416	}	398	}
417		399
418	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	400	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
419	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	401	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
420	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	402	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		403	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
421		404
422	/* I have not the slightest idea of why av_reify is necessary */	405	#define VAR(name,type)c->name = PL_ ## name;
423	/* but if it's missing the defav contents magically get replaced sometimes */	406	# include "state.h"
424	if (c->defav)	407	#undef VAR
425	av_reify (c->defav);
426
427	c->dowarn = PL_dowarn;
428	c->in_eval = PL_in_eval;
429
430	c->curstackinfo = PL_curstackinfo;
431	c->curstack = PL_curstack;
432	c->mainstack = PL_mainstack;
433	c->stack_sp = PL_stack_sp;
434	c->op = PL_op;
435	c->curpad = PL_curpad;
436	c->stack_base = PL_stack_base;
437	c->stack_max = PL_stack_max;
438	c->tmps_stack = PL_tmps_stack;
439	c->tmps_floor = PL_tmps_floor;
440	c->tmps_ix = PL_tmps_ix;
441	c->tmps_max = PL_tmps_max;
442	c->markstack = PL_markstack;
443	c->markstack_ptr = PL_markstack_ptr;
444	c->markstack_max = PL_markstack_max;
445	c->scopestack = PL_scopestack;
446	c->scopestack_ix = PL_scopestack_ix;
447	c->scopestack_max = PL_scopestack_max;
448	c->savestack = PL_savestack;
449	c->savestack_ix = PL_savestack_ix;
450	c->savestack_max = PL_savestack_max;
451	c->retstack = PL_retstack;
452	c->retstack_ix = PL_retstack_ix;
453	c->retstack_max = PL_retstack_max;
454	c->curcop = PL_curcop;
455	c->top_env = PL_top_env;
456	}	408	}
457		409
458	/*	410	/*
459	* allocate various perl stacks. This is an exact copy	411	* allocate various perl stacks. This is an exact copy
460	* of perl.c:init_stacks, except that it uses less memory	412	* of perl.c:init_stacks, except that it uses less memory
461	* on the assumption that coroutines do not usually need	413	* on the (sometimes correct) assumption that coroutines do
462	* a lot of stackspace.	414	* not usually need a lot of stackspace.
463	*/	415	*/
464	STATIC void	416	static void
465	coro_init_stacks (pTHX)	417	coro_init_stacks ()
466	{	418	{
467	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
468	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
469	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
470	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
471		423
472	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
473	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
474	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
475		427
476	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
477	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
478	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
479	PL_tmps_max = 96;	431	PL_tmps_max = 128;
480		432
481	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
482	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
483	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
484		436
		437	#ifdef SET_MARK_OFFSET
485	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
		439	#endif
486		440
487	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
488	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
489	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
490		444
491	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
492	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
493	PL_savestack_max = 96;	447	PL_savestack_max = 64;
494		448
		449	#if !PERL_VERSION_ATLEAST (5,9,0)
495	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
496	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
497	PL_retstack_max = 8;	452	PL_retstack_max = 16;
		453	#endif
498	}	454	}
499		455
500	/*	456	/*
501	* destroy the stacks, the callchain etc...	457	* destroy the stacks, the callchain etc...
502	* still there is a memleak of 128 bytes...
503	*/	458	*/
504	STATIC void	459	static void
505	destroy_stacks(pTHX)	460	coro_destroy_stacks ()
506	{	461	{
		462	if (!IN_DESTRUCT)
		463	{
507	/* is this ugly, I ask? */	464	/* is this ugly, I ask? */
508	while (PL_scopestack_ix)	465	LEAVE_SCOPE (0);
509	LEAVE;
510		466
511	/* sure it is, but more important: is it correct?? :/ */	467	/* sure it is, but more important: is it correct?? :/ */
512	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
513	FREETMPS;	468	FREETMPS;
		469
		470	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		471	}
514		472
515	while (PL_curstackinfo->si_next)	473	while (PL_curstackinfo->si_next)
516	PL_curstackinfo = PL_curstackinfo->si_next;	474	PL_curstackinfo = PL_curstackinfo->si_next;
517		475
518	while (PL_curstackinfo)	476	while (PL_curstackinfo)
519	{	477	{
520	PERL_SI *p = PL_curstackinfo->si_prev;	478	PERL_SI *p = PL_curstackinfo->si_prev;
521		479
522	{	480	{ /*D*//*remove*/
523	dSP;	481	dSP;
524	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	482	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
525	PUTBACK; /* possibly superfluous */	483	PUTBACK; /* possibly superfluous */
526	}	484	}
527		485
528	dounwind(-1);	486	if (!IN_DESTRUCT)
529		487	{
		488	dounwind (-1);/*D*//*remove*/
530	SvREFCNT_dec(PL_curstackinfo->si_stack);	489	SvREFCNT_dec (PL_curstackinfo->si_stack);
		490	}
		491
531	Safefree(PL_curstackinfo->si_cxstack);	492	Safefree (PL_curstackinfo->si_cxstack);
532	Safefree(PL_curstackinfo);	493	Safefree (PL_curstackinfo);
533	PL_curstackinfo = p;	494	PL_curstackinfo = p;
534	}	495	}
535		496
536	Safefree(PL_tmps_stack);	497	Safefree (PL_tmps_stack);
537	Safefree(PL_markstack);	498	Safefree (PL_markstack);
538	Safefree(PL_scopestack);	499	Safefree (PL_scopestack);
539	Safefree(PL_savestack);	500	Safefree (PL_savestack);
		501	#if !PERL_VERSION_ATLEAST (5,9,0)
540	Safefree(PL_retstack);	502	Safefree (PL_retstack);
541	}
542
543	static void
544	allocate_stack (Coro__State ctx, int alloc)
545	{
546	coro_stack *stack;
547
548	New (0, stack, 1, coro_stack);
549
550	stack->refcnt = 1;
551	stack->usecnt = 1;
552	stack->gencnt = ctx->gencnt = 0;
553	if (alloc)
554	{
555	#ifdef HAVE_MMAP
556	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
557	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
558	if (stack->sptr == (void *)-1)
559	#endif	503	#endif
560	{
561	/*FIXME*//*D*//* reasonable stack size! */
562	stack->ssize = -4096 * sizeof (long);
563	New (0, stack->sptr, 4096, long);
564	}
565	}
566	else
567	stack->sptr = 0;
568
569	ctx->stack = stack;
570	}	504	}
571		505
572	static void	506	static void
573	deallocate_stack (Coro__State ctx)	507	setup_coro (struct coro *coro)
574	{
575	coro_stack *stack = ctx->stack;
576
577	ctx->stack = 0;
578
579	if (stack)
580	{
581	if (!--stack->refcnt)
582	{
583	#ifdef HAVE_MMAP
584	if (stack->ssize > 0 && stack->sptr)
585	munmap (stack->sptr, stack->ssize);
586	else
587	#else
588	Safefree (stack->sptr);
589	#endif
590	Safefree (stack);
591	}
592	else if (ctx->gencnt == stack->gencnt)
593	--stack->usecnt;
594	}
595	}
596
597	static void
598	setup_coro (void *arg)
599	{	508	{
600	/*	509	/*
601	* emulate part of the perl startup here.	510	* emulate part of the perl startup here.
602	*/	511	*/
		512
		513	coro_init_stacks ();
		514
		515	PL_curcop = &PL_compiling;
		516	PL_in_eval = EVAL_NULL;
		517	PL_curpm = 0;
		518	PL_localizing = 0;
		519	PL_dirty = 0;
		520	PL_restartop = 0;
		521
		522	{
		523	dSP;
		524	LOGOP myop;
		525
		526	SvREFCNT_dec (GvAV (PL_defgv));
		527	GvAV (PL_defgv) = coro->args; coro->args = 0;
		528
		529	Zero (&myop, 1, LOGOP);
		530	myop.op_next = Nullop;
		531	myop.op_flags = OPf_WANT_VOID;
		532
		533	PUSHMARK (SP);
		534	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		535	PUTBACK;
		536	PL_op = (OP *)&myop;
		537	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		538	SPAGAIN;
		539	}
		540
		541	ENTER; /* necessary e.g. for dounwind */
		542	}
		543
		544	static void
		545	free_coro_mortal ()
		546	{
		547	if (coro_mortal)
		548	{
		549	SvREFCNT_dec (coro_mortal);
		550	coro_mortal = 0;
		551	}
		552	}
		553
		554	/* inject a fake call to Coro::State::_cctx_init into the execution */
		555	static void NOINLINE
		556	prepare_cctx (coro_cctx *cctx)
		557	{
603	dSP;	558	dSP;
604	Coro__State ctx = (Coro__State)arg;	559	LOGOP myop;
605	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
606		560
607	coro_init_stacks (aTHX);	561	Zero (&myop, 1, LOGOP);
608	/*PL_curcop = 0;*/	562	myop.op_next = PL_op;
609	/*PL_in_eval = PL_in_eval;*/ /* inherit */	563	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
610	SvREFCNT_dec (GvAV (PL_defgv));
611	GvAV (PL_defgv) = ctx->args;
612		564
		565	PUSHMARK (SP);
		566	EXTEND (SP, 2);
		567	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		568	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		569	PUTBACK;
		570	PL_op = (OP *)&myop;
		571	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
613	SPAGAIN;	572	SPAGAIN;
614
615	if (ctx->stack)
616	{
617	ctx->cursp = 0;
618
619	PUSHMARK(SP);
620	PUTBACK;
621	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
622
623	if (SvTRUE (ERRSV))
624	croak (NULL);
625	else
626	croak ("FATAL: CCTXT coroutine returned!");
627	}
628	else
629	{
630	UNOP myop;
631
632	PL_op = (OP *)&myop;
633
634	Zero(&myop, 1, UNOP);
635	myop.op_next = Nullop;
636	myop.op_flags = OPf_WANT_VOID;
637
638	PUSHMARK(SP);
639	XPUSHs (sub_init);
640	/*
641	* the next line is slightly wrong, as PL_op->op_next
642	* is actually being executed so we skip the first op.
643	* that doesn't matter, though, since it is only
644	* pp_nextstate and we never return...
645	* ah yes, and I don't care anyways ;)
646	*/
647	PUTBACK;
648	PL_op = pp_entersub();
649	SPAGAIN;
650
651	ENTER; /* necessary e.g. for dounwind */
652	}
653	}	573	}
654		574
655	static void	575	static void
656	continue_coro (void *arg)	576	coro_run (void *arg)
657	{	577	{
		578	/* coro_run is the alternative tail of transfer(), so unlock here. */
		579	UNLOCK;
		580
658	/*	581	/*
659	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
660	*/	583	*/
661	Coro__State ctx = (Coro__State)arg;	584	PL_top_env = &PL_start_env;
662		585
663	/*FIXME*//* must set up top_env here */	586	/* inject call to cctx_init */
664	ctx->cursp = 0;	587	prepare_cctx ((coro_cctx *)arg);
665	PL_op = PL_op->op_next;
666	CALLRUNOPS(aTHX);
667		588
		589	/* somebody will hit me for both perl_run and PL_restartop */
		590	PL_restartop = PL_op;
		591	perl_run (PL_curinterp);
		592
		593	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
668	abort ();	594	abort ();
669	}	595	}
670		596
671	STATIC void	597	static coro_cctx *
		598	cctx_new ()
		599	{
		600	coro_cctx *cctx;
		601
		602	++cctx_count;
		603
		604	Newz (0, cctx, 1, coro_cctx);
		605
		606	#if HAVE_MMAP
		607
		608	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		609	/* mmap supposedly does allocate-on-write for us */
		610	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		611
		612	if (cctx->sptr == (void *)-1)
		613	{
		614	perror ("FATAL: unable to mmap stack for coroutine");
		615	_exit (EXIT_FAILURE);
		616	}
		617
		618	# if STACKGUARD
		619	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		620	# endif
		621
		622	#else
		623
		624	cctx->ssize = STACKSIZE * (long)sizeof (long);
		625	New (0, cctx->sptr, STACKSIZE, long);
		626
		627	if (!cctx->sptr)
		628	{
		629	perror ("FATAL: unable to malloc stack for coroutine");
		630	_exit (EXIT_FAILURE);
		631	}
		632
		633	#endif
		634
		635	#if USE_VALGRIND
		636	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		637	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		638	cctx->ssize + (char *)cctx->sptr
		639	);
		640	#endif
		641
		642	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		643
		644	return cctx;
		645	}
		646
		647	static void
		648	cctx_destroy (coro_cctx *cctx)
		649	{
		650	if (!cctx)
		651	return;
		652
		653	--cctx_count;
		654
		655	#if USE_VALGRIND
		656	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		657	#endif
		658
		659	#if HAVE_MMAP
		660	munmap (cctx->sptr, cctx->ssize);
		661	#else
		662	Safefree (cctx->sptr);
		663	#endif
		664
		665	Safefree (cctx);
		666	}
		667
		668	static coro_cctx *
		669	cctx_get ()
		670	{
		671	coro_cctx *cctx;
		672
		673	if (cctx_first)
		674	{
		675	cctx = cctx_first;
		676	cctx_first = cctx->next;
		677	--cctx_idle;
		678	}
		679	else
		680	{
		681	cctx = cctx_new ();
		682	PL_op = PL_op->op_next;
		683	}
		684
		685	return cctx;
		686	}
		687
		688	static void
		689	cctx_put (coro_cctx *cctx)
		690	{
		691	/* free another cctx if overlimit */
		692	if (cctx_idle >= MAX_IDLE_CCTX)
		693	{
		694	coro_cctx *first = cctx_first;
		695	cctx_first = first->next;
		696	--cctx_idle;
		697
		698	assert (!first->inuse);
		699	cctx_destroy (first);
		700	}
		701
		702	++cctx_idle;
		703	cctx->next = cctx_first;
		704	cctx_first = cctx;
		705	}
		706
		707	/* never call directly, always through the coro_state_transfer global variable */
		708	static void NOINLINE
672	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	709	transfer (struct coro *prev, struct coro *next)
673	{	710	{
674	dSP;
675	dSTACKLEVEL;	711	dSTACKLEVEL;
676		712
		713	/* sometimes transfer is only called to set idle_sp */
		714	if (!next)
		715	{
		716	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		717	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		718	}
677	if (prev != next)	719	else if (prev != next)
678	{	720	{
679	if (next->mainstack)	721	coro_cctx *prev__cctx;
		722
		723	if (prev->flags & CF_NEW)
680	{	724	{
681	SAVE (prev, flags);	725	/* create a new empty context */
682	LOAD (next);	726	Newz (0, prev->cctx, 1, coro_cctx);
683		727	prev->cctx->inuse = 1;
684	/* mark this state as in-use */	728	prev->flags &= ~CF_NEW;
685	next->mainstack = 0;	729	prev->flags |= CF_RUNNING;
686	next->tmps_ix = -2;
687
688	/* stacklevel changed? if yes, grab the stack for us! */
689	if (flags & TRANSFER_SAVE_CCTXT)
690	{
691	if (!prev->stack)
692	allocate_stack (prev, 0);
693	else if (prev->cursp != stacklevel
694	&& prev->stack->usecnt > 1)
695	{
696	prev->gencnt = ++prev->stack->gencnt;
697	prev->stack->usecnt = 1;
698	}
699
700	/* has our stack been invalidated? */
701	if (next->stack && next->stack->gencnt != next->gencnt)
702	{
703	deallocate_stack (next);
704	allocate_stack (next, 1);
705	coro_create (&(next->stack->cctx),
706	continue_coro, (void *)next,
707	next->stack->sptr, labs (next->stack->ssize));
708	}
709
710	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
711	}
712
713	}	730	}
714	else if (next->tmps_ix == -2)	731
715	croak ("tried to transfer to running coroutine");	732	/*TODO: must not croak here */
		733	if (!prev->flags & CF_RUNNING)
		734	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		735
		736	if (next->flags & CF_RUNNING)
		737	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		738
		739	prev->flags &= ~CF_RUNNING;
		740	next->flags |= CF_RUNNING;
		741
		742	LOCK;
		743
		744	if (next->flags & CF_NEW)
		745	{
		746	/* need to start coroutine */
		747	next->flags &= ~CF_NEW;
		748	/* first get rid of the old state */
		749	save_perl (prev);
		750	/* setup coroutine call */
		751	setup_coro (next);
		752	/* need a new stack */
		753	assert (!next->cctx);
		754	}
716	else	755	else
717	{	756	{
718	SAVE (prev, -1); /* first get rid of the old state */	757	/* coroutine already started */
719		758	save_perl (prev);
720	if (flags & TRANSFER_SAVE_CCTXT)	759	load_perl (next);
721	{
722	if (!prev->stack)
723	allocate_stack (prev, 0);
724
725	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
726	{
727	setup_coro (next);
728
729	prev->stack->refcnt++;
730	prev->stack->usecnt++;
731	next->stack = prev->stack;
732	next->gencnt = prev->gencnt;
733	}
734	else
735	{
736	allocate_stack (next, 1);
737	coro_create (&(next->stack->cctx),
738	setup_coro, (void *)next,
739	next->stack->sptr, labs (next->stack->ssize));
740	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
741	}
742	}
743	else
744	setup_coro (next);
745	}	760	}
		761
		762	prev__cctx = prev->cctx;
		763
		764	/* possibly "free" the cctx */
		765	if (prev__cctx->idle_sp == STACKLEVEL)
		766	{
		767	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		768	assert (PL_top_env == prev__cctx->top_env);
		769
		770	prev->cctx = 0;
		771
		772	cctx_put (prev__cctx);
		773	prev__cctx->inuse = 0;
		774	}
		775
		776	if (!next->cctx)
		777	{
		778	next->cctx = cctx_get ();
		779	assert (!next->cctx->inuse);
		780	next->cctx->inuse = 1;
		781	}
		782
		783	if (prev__cctx != next->cctx)
		784	{
		785	prev__cctx->top_env = PL_top_env;
		786	PL_top_env = next->cctx->top_env;
		787	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		788	}
		789
		790	free_coro_mortal ();
		791
		792	UNLOCK;
746	}	793	}
		794	}
747		795
748	next->cursp = stacklevel;	796	struct transfer_args
		797	{
		798	struct coro *prev, *next;
		799	};
		800
		801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		802
		803	static void
		804	coro_state_destroy (struct coro *coro)
		805	{
		806	if (coro->refcnt--)
		807	return;
		808
		809	if (coro->mainstack && coro->mainstack != main_mainstack)
		810	{
		811	struct coro temp;
		812	Zero (&temp, 1, struct coro);
		813	temp.save = CORO_SAVE_ALL;
		814
		815	if (coro->flags & CF_RUNNING)
		816	croak ("FATAL: tried to destroy currently running coroutine");
		817
		818	save_perl (&temp);
		819	load_perl (coro);
		820
		821	coro_destroy_stacks ();
		822
		823	load_perl (&temp); /* this will get rid of defsv etc.. */
		824
		825	coro->mainstack = 0;
		826	}
		827
		828	cctx_destroy (coro->cctx);
		829	SvREFCNT_dec (coro->args);
		830	Safefree (coro);
		831	}
		832
		833	static int
		834	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		835	{
		836	struct coro *coro = (struct coro *)mg->mg_ptr;
		837	mg->mg_ptr = 0;
		838
		839	coro_state_destroy (coro);
		840
		841	return 0;
		842	}
		843
		844	static int
		845	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		846	{
		847	struct coro *coro = (struct coro *)mg->mg_ptr;
		848
		849	++coro->refcnt;
		850
		851	return 0;
		852	}
		853
		854	static MGVTBL coro_state_vtbl = {
		855	0, 0, 0, 0,
		856	coro_state_clear,
		857	0,
		858	#ifdef MGf_DUP
		859	coro_state_dup,
		860	#else
		861	# define MGf_DUP 0
		862	#endif
		863	};
		864
		865	static struct coro *
		866	SvSTATE (SV *coro)
		867	{
		868	HV *stash;
		869	MAGIC *mg;
		870
		871	if (SvROK (coro))
		872	coro = SvRV (coro);
		873
		874	stash = SvSTASH (coro);
		875	if (stash != coro_stash && stash != coro_state_stash)
		876	{
		877	/* very slow, but rare, check */
		878	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		879	croak ("Coro::State object required");
		880	}
		881
		882	mg = SvMAGIC (coro);
		883	assert (mg->mg_type == PERL_MAGIC_ext);
		884	return (struct coro *)mg->mg_ptr;
		885	}
		886
		887	static void
		888	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		889	{
		890	ta->prev = SvSTATE (prev_sv);
		891	ta->next = SvSTATE (next_sv);
		892	}
		893
		894	static void
		895	api_transfer (SV *prev_sv, SV *next_sv)
		896	{
		897	struct transfer_args ta;
		898
		899	prepare_transfer (&ta, prev_sv, next_sv);
		900	TRANSFER (ta);
		901	}
		902
		903	static int
		904	api_save (SV *coro_sv, int new_save)
		905	{
		906	struct coro *coro = SvSTATE (coro_sv);
		907	int old_save = coro->save;
		908
		909	if (new_save >= 0)
		910	coro->save = new_save;
		911
		912	return old_save;
		913	}
		914
		915	/** Coro ********************************************************************/
		916
		917	#define PRIO_MAX 3
		918	#define PRIO_HIGH 1
		919	#define PRIO_NORMAL 0
		920	#define PRIO_LOW -1
		921	#define PRIO_IDLE -3
		922	#define PRIO_MIN -4
		923
		924	/* for Coro.pm */
		925	static SV *coro_current;
		926	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		927	static int coro_nready;
		928
		929	static void
		930	coro_enq (SV *coro_sv)
		931	{
		932	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		933	coro_nready++;
		934	}
		935
		936	static SV *
		937	coro_deq (int min_prio)
		938	{
		939	int prio = PRIO_MAX - PRIO_MIN;
		940
		941	min_prio -= PRIO_MIN;
		942	if (min_prio < 0)
		943	min_prio = 0;
		944
		945	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		946	if (AvFILLp (coro_ready [prio]) >= 0)
		947	{
		948	coro_nready--;
		949	return av_shift (coro_ready [prio]);
		950	}
		951
		952	return 0;
		953	}
		954
		955	static int
		956	api_ready (SV *coro_sv)
		957	{
		958	struct coro *coro;
		959
		960	if (SvROK (coro_sv))
		961	coro_sv = SvRV (coro_sv);
		962
		963	coro = SvSTATE (coro_sv);
		964
		965	if (coro->flags & CF_READY)
		966	return 0;
		967
		968	#if 0 /* this is actually harmless */
		969	if (coro->flags & CF_RUNNING)
		970	croak ("Coro::ready called on currently running coroutine");
		971	#endif
		972
		973	coro->flags |= CF_READY;
		974
		975	LOCK;
		976	coro_enq (SvREFCNT_inc (coro_sv));
		977	UNLOCK;
		978
		979	return 1;
		980	}
		981
		982	static int
		983	api_is_ready (SV *coro_sv)
		984	{
		985	return !!SvSTATE (coro_sv)->flags & CF_READY;
		986	}
		987
		988	static void
		989	prepare_schedule (struct transfer_args *ta)
		990	{
		991	SV *prev, *next;
		992
		993	for (;;)
		994	{
		995	LOCK;
		996	next = coro_deq (PRIO_MIN);
		997	UNLOCK;
		998
		999	if (next)
		1000	break;
		1001
		1002	{
		1003	dSP;
		1004
		1005	ENTER;
		1006	SAVETMPS;
		1007
		1008	PUSHMARK (SP);
		1009	PUTBACK;
		1010	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1011
		1012	FREETMPS;
		1013	LEAVE;
		1014	}
		1015	}
		1016
		1017	prev = SvRV (coro_current);
		1018	SvRV_set (coro_current, next);
		1019
		1020	/* free this only after the transfer */
		1021	LOCK;
		1022	free_coro_mortal ();
		1023	UNLOCK;
		1024	coro_mortal = prev;
		1025
		1026	assert (!SvROK(prev));//D
		1027	assert (!SvROK(next));//D
		1028
		1029	ta->prev = SvSTATE (prev);
		1030	ta->next = SvSTATE (next);
		1031
		1032	assert (ta->next->flags & CF_READY);
		1033	ta->next->flags &= ~CF_READY;
		1034	}
		1035
		1036	static void
		1037	prepare_cede (struct transfer_args *ta)
		1038	{
		1039	api_ready (coro_current);
		1040
		1041	prepare_schedule (ta);
		1042	}
		1043
		1044	static void
		1045	api_schedule (void)
		1046	{
		1047	struct transfer_args ta;
		1048
		1049	prepare_schedule (&ta);
		1050	TRANSFER (ta);
		1051	}
		1052
		1053	static void
		1054	api_cede (void)
		1055	{
		1056	struct transfer_args ta;
		1057
		1058	prepare_cede (&ta);
		1059	TRANSFER (ta);
749	}	1060	}
750		1061
751	MODULE = Coro::State PACKAGE = Coro::State	1062	MODULE = Coro::State PACKAGE = Coro::State
752		1063
753	PROTOTYPES: ENABLE	1064	PROTOTYPES: DISABLE
754		1065
755	BOOT:	1066	BOOT:
756	{ /* {} necessary for stoopid perl-5.6.x */	1067	{
757	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1068	#ifdef USE_ITHREADS
758	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1069	MUTEX_INIT (&coro_mutex);
		1070	#endif
		1071	BOOT_PAGESIZE;
		1072
759	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1073	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
760		1074
761	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1075	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
762	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1076	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
763	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1077	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1078	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
764	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1079	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
765
766	if (!padlist_cache)
767	padlist_cache = newHV ();
768		1080
769	main_mainstack = PL_mainstack;	1081	main_mainstack = PL_mainstack;
770	}
771		1082
772	Coro::State	1083	coroapi.ver = CORO_API_VERSION;
773	_newprocess(args)	1084	coroapi.transfer = api_transfer;
774	SV * args	1085
775	PROTOTYPE: $	1086	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1087	}
		1088
		1089	SV *
		1090	new (char *klass, ...)
776	CODE:	1091	CODE:
777	Coro__State coro;	1092	{
		1093	struct coro *coro;
		1094	HV *hv;
		1095	int i;
778		1096
779	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
780	croak ("Coro::State::_newprocess expects an arrayref");
781
782	New (0, coro, 1, struct coro);	1097	Newz (0, coro, 1, struct coro);
		1098	coro->args = newAV ();
		1099	coro->save = CORO_SAVE_ALL;
		1100	coro->flags = CF_NEW;
783		1101
784	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1102	hv = newHV ();
785	coro->mainstack = 0; /* actual work is done inside transfer */	1103	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
786	coro->stack = 0;	1104	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
787		1105
788	RETVAL = coro;	1106	for (i = 1; i < items; i++)
		1107	av_push (coro->args, newSVsv (ST (i)));
		1108	}
789	OUTPUT:	1109	OUTPUT:
790	RETVAL	1110	RETVAL
791		1111
		1112	int
		1113	save (SV *coro, int new_save = -1)
		1114	CODE:
		1115	RETVAL = api_save (coro, new_save);
		1116	OUTPUT:
		1117	RETVAL
		1118
792	void	1119	void
793	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1120	_set_stacklevel (...)
794	Coro::State_or_hashref prev	1121	ALIAS:
795	Coro::State_or_hashref next	1122	Coro::State::transfer = 1
796	int flags	1123	Coro::schedule = 2
797	PROTOTYPE: @	1124	Coro::cede = 3
798	CODE:	1125	CODE:
799	transfer (aTHX_ prev, next, flags);	1126	{
		1127	struct transfer_args ta;
		1128
		1129	switch (ix)
		1130	{
		1131	case 0:
		1132	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1133	ta.next = 0;
		1134	break;
		1135
		1136	case 1:
		1137	if (items != 2)
		1138	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1139
		1140	prepare_transfer (&ta, ST (0), ST (1));
		1141	break;
		1142
		1143	case 2:
		1144	prepare_schedule (&ta);
		1145	break;
		1146
		1147	case 3:
		1148	prepare_cede (&ta);
		1149	break;
		1150	}
		1151
		1152	TRANSFER (ta);
		1153	}
800		1154
801	void	1155	void
802	DESTROY(coro)	1156	_clone_state_from (SV *dst, SV *src)
803	Coro::State coro	1157	CODE:
		1158	{
		1159	struct coro *coro_src = SvSTATE (src);
		1160
		1161	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1162
		1163	++coro_src->refcnt;
		1164	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1165	}
		1166
		1167	void
		1168	_exit (code)
		1169	int code
		1170	PROTOTYPE: $
		1171	CODE:
		1172	_exit (code);
		1173
		1174	int
		1175	cctx_count ()
		1176	CODE:
		1177	RETVAL = cctx_count;
		1178	OUTPUT:
		1179	RETVAL
		1180
		1181	int
		1182	cctx_idle ()
		1183	CODE:
		1184	RETVAL = cctx_idle;
		1185	OUTPUT:
		1186	RETVAL
		1187
		1188	MODULE = Coro::State PACKAGE = Coro
		1189
		1190	BOOT:
		1191	{
		1192	int i;
		1193
		1194	coro_stash = gv_stashpv ("Coro", TRUE);
		1195
		1196	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1197	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1198	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1199	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1200	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1201	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1202
		1203	coro_current = get_sv ("Coro::current", FALSE);
		1204	SvREADONLY_on (coro_current);
		1205
		1206	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1207	coro_ready[i] = newAV ();
		1208
		1209	{
		1210	SV *sv = perl_get_sv("Coro::API", 1);
		1211
		1212	coroapi.schedule = api_schedule;
		1213	coroapi.save = api_save;
		1214	coroapi.cede = api_cede;
		1215	coroapi.ready = api_ready;
		1216	coroapi.is_ready = api_is_ready;
		1217	coroapi.nready = &coro_nready;
		1218	coroapi.current = coro_current;
		1219
		1220	GCoroAPI = &coroapi;
		1221	sv_setiv (sv, (IV)&coroapi);
		1222	SvREADONLY_on (sv);
		1223	}
		1224	}
		1225
		1226	void
		1227	_set_current (SV *current)
		1228	PROTOTYPE: $
		1229	CODE:
		1230	SvREFCNT_dec (SvRV (coro_current));
		1231	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1232
		1233	int
		1234	prio (Coro::State coro, int newprio = 0)
		1235	ALIAS:
		1236	nice = 1
804	CODE:	1237	CODE:
		1238	{
		1239	RETVAL = coro->prio;
805		1240
806	if (coro->mainstack && coro->mainstack != main_mainstack)	1241	if (items > 1)
807	{	1242	{
808	struct coro temp;	1243	if (ix)
		1244	newprio += coro->prio;
809		1245
810	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1246	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
811	LOAD(aTHX_ coro);	1247	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
812		1248
813	destroy_stacks (aTHX);	1249	coro->prio = newprio;
814
815	LOAD((&temp)); /* this will get rid of defsv etc.. */
816
817	coro->mainstack = 0;
818	}	1250	}
		1251	}
819		1252
820	deallocate_stack (coro);	1253	SV *
		1254	ready (SV *self)
		1255	PROTOTYPE: $
		1256	CODE:
		1257	RETVAL = boolSV (api_ready (self));
		1258	OUTPUT:
		1259	RETVAL
821		1260
822	Safefree (coro);	1261	SV *
		1262	is_ready (SV *self)
		1263	PROTOTYPE: $
		1264	CODE:
		1265	RETVAL = boolSV (api_is_ready (self));
		1266	OUTPUT:
		1267	RETVAL
		1268
		1269	int
		1270	nready (...)
		1271	PROTOTYPE:
		1272	CODE:
		1273	RETVAL = coro_nready;
		1274	OUTPUT:
		1275	RETVAL
		1276
		1277	MODULE = Coro::State PACKAGE = Coro::AIO
		1278
		1279	SV *
		1280	_get_state ()
		1281	CODE:
		1282	{
		1283	struct io_state *data;
		1284
		1285	RETVAL = newSV (sizeof (struct io_state));
		1286	data = (struct io_state *)SvPVX (RETVAL);
		1287	SvCUR_set (RETVAL, sizeof (struct io_state));
		1288	SvPOK_only (RETVAL);
		1289
		1290	data->errorno = errno;
		1291	data->laststype = PL_laststype;
		1292	data->laststatval = PL_laststatval;
		1293	data->statcache = PL_statcache;
		1294	}
		1295	OUTPUT:
		1296	RETVAL
823		1297
824	void	1298	void
825	flush()	1299	_set_state (char *data_)
		1300	PROTOTYPE: $
826	CODE:	1301	CODE:
827	#ifdef MAY_FLUSH	1302	{
828	flush_padlist_cache ();	1303	struct io_state *data = (void *)data_;
829	#endif
830		1304
831	MODULE = Coro::State PACKAGE = Coro::Cont	1305	errno = data->errorno;
		1306	PL_laststype = data->laststype;
		1307	PL_laststatval = data->laststatval;
		1308	PL_statcache = data->statcache;
		1309	}
832		1310
833	# this is slightly dirty
834
835	void
836	yield(...)
837	PROTOTYPE: @
838	CODE:
839	static SV *returnstk;
840	SV *sv;
841	AV *defav = GvAV (PL_defgv);
842	struct coro *prev, *next;
843
844	if (!returnstk)
845	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
846
847	/* set up @_ -- ugly */
848	av_clear (defav);
849	av_fill (defav, items - 1);
850	while (items--)
851	av_store (defav, items, SvREFCNT_inc (ST(items)));
852
853	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
854	sv = av_pop ((AV *)SvRV (returnstk));
855	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
856	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
857	SvREFCNT_dec (sv);
858
859	transfer(aTHX_ prev, next, 0);
860

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