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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.17 by root, Wed Jul 25 14:01:46 2001 UTC vs.
Revision 1.119 by root, Sat Dec 2 15:41:28 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	#include <stdio.h>
		44	#include <errno.h>
		45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
6		53
7	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
8	# include <unistd.h>	55	# include <unistd.h>
9	# include <sys/mman.h>	56	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
13	# else	60	# else
14	# undef HAVE_MMAP	61	# undef HAVE_MMAP
15	# endif	62	# endif
16	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
17	#endif	71	# 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	72	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	73	# define PAGESIZE 0
		74	# define BOOT_PAGESIZE (void)0
31	#endif	75	#endif
32		76
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	77	/* 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	78	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
43		82
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		84
46	/* this is actually not only the c stack but also c registers etc... */	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
		92
		93	#include "CoroAPI.h"
		94
		95	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		96
		97	#ifdef USE_ITHREADS
		98	static perl_mutex coro_mutex;
		99	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		100	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		101	#else
		102	# define LOCK (void)0
		103	# define UNLOCK (void)0
		104	#endif
		105
		106	static struct CoroAPI coroapi;
		107	static AV *main_mainstack; /* used to differentiate between $main and others */
		108	static HV *coro_state_stash, *coro_stash;
		109	static SV *coro_mortal; /* will be freed after next transfer */
		110
		111	static struct coro_cctx *cctx_first;
		112	static int cctx_count, cctx_idle;
		113
		114	/* this is a structure representing a c-level coroutine */
47	typedef struct {	115	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	116	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		117
52	coro_context cctx;	118	/* the stack */
53
54	void *sptr;	119	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	120	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		121
58	static coro_stack main_stack = { 1, 0, 0 };	122	/* cpu state */
		123	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		124	JMPENV *top_env;
		125	coro_context cctx;
59		126
		127	int inuse;
		128
		129	#if USE_VALGRIND
		130	int valgrind_id;
		131	#endif
		132	} coro_cctx;
		133
		134	enum {
		135	CF_RUNNING = 0x0001, /* coroutine is running */
		136	CF_READY = 0x0002, /* coroutine is ready */
		137	CF_NEW = 0x0004, /* ahs never been switched to */
		138	};
		139
		140	/* this is a structure representing a perl-level coroutine */
60	struct coro {	141	struct coro {
61	/* the optional C context */	142	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	143	coro_cctx *cctx;
63	void *cursp;	144
		145	/* data associated with this coroutine (initial args) */
		146	AV *args;
64	int gencnt;	147	int refcnt;
		148	int flags;
65		149
66	/* optionally saved, might be zero */	150	/* optionally saved, might be zero */
67	AV *defav;	151	AV *defav;
68	SV *defsv;	152	SV *defsv;
69	SV *errsv;	153	SV *errsv;
70		154
71	/* saved global state not related to stacks */	155	#define VAR(name,type) type name;
72	U8 dowarn;	156	# include "state.h"
		157	#undef VAR
73		158
74	/* the stacks and related info (callchain etc..) */	159	/* coro process data */
75	PERL_SI *curstackinfo;	160	int prio;
76	AV *curstack;
77	AV *mainstack;
78	SV **stack_sp;
79	OP *op;
80	SV **curpad;
81	SV **stack_base;
82	SV **stack_max;
83	SV **tmps_stack;
84	I32 tmps_floor;
85	I32 tmps_ix;
86	I32 tmps_max;
87	I32 *markstack;
88	I32 *markstack_ptr;
89	I32 *markstack_max;
90	I32 *scopestack;
91	I32 scopestack_ix;
92	I32 scopestack_max;
93	ANY *savestack;
94	I32 savestack_ix;
95	I32 savestack_max;
96	OP **retstack;
97	I32 retstack_ix;
98	I32 retstack_max;
99	COP *curcop;
100	JMPENV start_env;
101	JMPENV *top_env;
102
103	/* data associated with this coroutine (initial args) */
104	AV *args;
105	};	161	};
106		162
107	typedef struct coro *Coro__State;	163	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	164	typedef struct coro *Coro__State_or_hashref;
109		165
110	static AV *main_mainstack; /* used to differentiate between $main and others */	166	static AV *
111	static HV *coro_state_stash;	167	coro_clone_padlist (CV *cv)
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115
116	/* mostly copied from op.c:cv_clone2 */
117	STATIC AV *
118	clone_padlist (AV *protopadlist)
119	{	168	{
120	AV *av;	169	AV *padlist = CvPADLIST (cv);
121	I32 ix;
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
124	SV **pname = AvARRAY (protopad_name);
125	SV **ppad = AvARRAY (protopad);
126	I32 fname = AvFILLp (protopad_name);
127	I32 fpad = AvFILLp (protopad);
128	AV *newpadlist, *newpad_name, *newpad;	170	AV *newpadlist, *newpad;
129	SV **npad;
130
131	newpad_name = newAV ();
132	for (ix = fname; ix >= 0; ix--)
133	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135	newpad = newAV ();
136	av_fill (newpad, AvFILLp (protopad));
137	npad = AvARRAY (newpad);
138		171
139	newpadlist = newAV ();	172	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	173	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	174	#if PERL_VERSION_ATLEAST (5,9,0)
		175	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		176	#else
		177	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		178	#endif
		179	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		180	--AvFILLp (padlist);
		181
		182	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	183	av_store (newpadlist, 1, (SV *)newpad);
143		184
144	av = newAV (); /* will be @_ */	185	return newpadlist;
145	av_extend (av, 0);	186	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		187
149	for (ix = fpad; ix > 0; ix--)	188	static void
		189	free_padlist (AV *padlist)
		190	{
		191	/* may be during global destruction */
		192	if (SvREFCNT (padlist))
150	{	193	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	194	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	195	while (i >= 0)
153	{	196	{
154	char *name = SvPVX (namesv); /* XXX */	197	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	198	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	199	{
159	else
160	{ /* our own lexical */
161	SV *sv;	200	SV *sv;
162	if (*name == '&')	201	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	202	SvREFCNT_dec (sv);
164	else if (*name == '@')	203
165	sv = (SV *) newAV ();	204	SvREFCNT_dec (*svp);
166	else if (*name == '%')
167	sv = (SV *) newHV ();
168	else
169	sv = NEWSV (0, 0);
170	if (!SvPADBUSY (sv))
171	SvPADMY_on (sv);
172	npad[ix] = sv;
173	}	205	}
174	}	206	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	207
176	{	208	SvREFCNT_dec ((SV*)padlist);
177	npad[ix] = SvREFCNT_inc (ppad[ix]);
178	}
179	else
180	{
181	SV *sv = NEWSV (0, 0);
182	SvPADTMP_on (sv);
183	npad[ix] = sv;
184	}
185	}	209	}
		210	}
186		211
187	#if 0 /* return -ENOTUNDERSTOOD */	212	static int
188	/* Now that vars are all in place, clone nested closures. */	213	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		214	{
		215	AV *padlist;
		216	AV *av = (AV *)mg->mg_obj;
189		217
190	for (ix = fpad; ix > 0; ix--) {	218	/* casting is fun. */
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	219	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
192	if (namesv	220	free_padlist (padlist);
193	&& namesv != &PL_sv_undef	221
194	&& !(SvFLAGS(namesv) & SVf_FAKE)	222	SvREFCNT_dec (av);
195	&& *SvPVX(namesv) == '&'	223
196	&& CvCLONE(ppad[ix]))	224	return 0;
197	{	225	}
198	CV *kid = cv_clone((CV*)ppad[ix]);	226
199	SvREFCNT_dec(ppad[ix]);	227	#define PERL_MAGIC_coro PERL_MAGIC_ext
200	CvCLONE_on(kid);	228
201	SvPADMY_on(kid);	229	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
202	npad[ix] = (SV*)kid;	230
203	}	231	#define CORO_MAGIC(cv) \
		232	SvMAGIC (cv) \
		233	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		234	? SvMAGIC (cv) \
		235	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		236	: 0
		237
		238	/* the next two functions merely cache the padlists */
		239	static void
		240	get_padlist (CV *cv)
		241	{
		242	MAGIC *mg = CORO_MAGIC (cv);
		243	AV *av;
		244
		245	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		246	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		247	else
		248	{
		249	#if 0
		250	/* this is probably cleaner, but also slower? */
		251	CV *cp = Perl_cv_clone (cv);
		252	CvPADLIST (cv) = CvPADLIST (cp);
		253	CvPADLIST (cp) = 0;
		254	SvREFCNT_dec (cp);
		255	#else
		256	CvPADLIST (cv) = coro_clone_padlist (cv);
		257	#endif
		258	}
		259	}
		260
		261	static void
		262	put_padlist (CV *cv)
		263	{
		264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
		266
		267	if (!mg)
		268	{
		269	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		270	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		271	mg->mg_virtual = &vtbl_coro;
		272	mg->mg_obj = (SV *)newAV ();
204	}	273	}
205	#endif
206		274
207	return newpadlist;	275	av = (AV *)mg->mg_obj;
208	}
209		276
210	#ifdef MAY_FLUSH	277	if (AvFILLp (av) >= AvMAX (av))
211	STATIC AV *	278	av_extend (av, AvMAX (av) + 1);
212	free_padlist (AV *padlist)
213	{
214	/* may be during global destruction */
215	if (SvREFCNT(padlist))
216	{
217	I32 i = AvFILLp(padlist);
218	while (i >= 0)
219	{
220	SV **svp = av_fetch(padlist, i--, FALSE);
221	SV *sv = svp ? *svp : Nullsv;
222	if (sv)
223	SvREFCNT_dec(sv);
224	}
225		279
226	SvREFCNT_dec((SV*)padlist);	280	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
227	}
228	}	281	}
229	#endif
230
231	/* the next two functions merely cache the padlists */
232	STATIC void
233	get_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
236
237	if (he && AvFILLp ((AV *)*he) >= 0)
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
239	else
240	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241	}
242
243	STATIC void
244	put_padlist (CV *cv)
245	{
246	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248	if (SvTYPE (*he) != SVt_PVAV)
249	{
250	SvREFCNT_dec (*he);
251	*he = (SV *)newAV ();
252	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282		282
283	#define SB do {	283	#define SB do {
284	#define SE } while (0)	284	#define SE } while (0)
285		285
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	286	#define LOAD(state) load_state ((state))
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	287	#define SAVE(state,flags) save_state ((state),(flags))
288		288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
290		290
291	static void	291	static void
292	load_state(pTHX_ Coro__State c)	292	load_state (Coro__State c)
293	{	293	{
294	PL_dowarn = c->dowarn;	294	#define VAR(name,type) PL_ ## name = c->name;
295		295	# include "state.h"
296	PL_curstackinfo = c->curstackinfo;	296	#undef VAR
297	PL_curstack = c->curstack;
298	PL_mainstack = c->mainstack;
299	PL_stack_sp = c->stack_sp;
300	PL_op = c->op;
301	PL_curpad = c->curpad;
302	PL_stack_base = c->stack_base;
303	PL_stack_max = c->stack_max;
304	PL_tmps_stack = c->tmps_stack;
305	PL_tmps_floor = c->tmps_floor;
306	PL_tmps_ix = c->tmps_ix;
307	PL_tmps_max = c->tmps_max;
308	PL_markstack = c->markstack;
309	PL_markstack_ptr = c->markstack_ptr;
310	PL_markstack_max = c->markstack_max;
311	PL_scopestack = c->scopestack;
312	PL_scopestack_ix = c->scopestack_ix;
313	PL_scopestack_max = c->scopestack_max;
314	PL_savestack = c->savestack;
315	PL_savestack_ix = c->savestack_ix;
316	PL_savestack_max = c->savestack_max;
317	PL_retstack = c->retstack;
318	PL_retstack_ix = c->retstack_ix;
319	PL_retstack_max = c->retstack_max;
320	PL_curcop = c->curcop;
321	PL_start_env = c->start_env;
322	PL_top_env = c->top_env;
323		297
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	298	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	299	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	300	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
327		301
…		…
330	CV *cv;	304	CV *cv;
331		305
332	/* now do the ugly restore mess */	306	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	307	while ((cv = (CV *)POPs))
334	{	308	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	309	put_padlist (cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	310	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	311	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	312	}
348		313
349	PUTBACK;	314	PUTBACK;
350	}	315	}
351	}	316	}
352		317
353	static void	318	static void
354	save_state(pTHX_ Coro__State c, int flags)	319	save_state (Coro__State c, int flags)
355	{	320	{
356	{	321	{
357	dSP;	322	dSP;
358	I32 cxix = cxstack_ix;	323	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	324	PERL_CONTEXT *ccstk = cxstack;
…		…
366		331
367	PUSHs (Nullsv);	332	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	333	/* this loop was inspired by pp_caller */
369	for (;;)	334	for (;;)
370	{	335	{
371	do	336	while (cxix >= 0)
372	{	337	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	338	PERL_CONTEXT *cx = &ccstk[cxix--];
374		339
375	if (CxTYPE(cx) == CXt_SUB)	340	if (CxTYPE (cx) == CXt_SUB)
376	{	341	{
377	CV *cv = cx->blk_sub.cv;	342	CV *cv = cx->blk_sub.cv;
		343
378	if (CvDEPTH(cv))	344	if (CvDEPTH (cv))
379	{	345	{
380	#ifdef USE_THREADS
381	/*XPUSHs ((SV *)CvOWNER(cv));*/
382	/*CvOWNER(cv) = 0;*/
383	/*error must unlock this cv etc.. etc...*/
384	#endif
385	EXTEND (SP, CvDEPTH(cv)*2);	346	EXTEND (SP, 3);
386		347
387	while (--CvDEPTH(cv))
388	{
389	/* this tells the restore code to increment CvDEPTH */
390	PUSHs (Nullsv);
391	PUSHs ((SV *)cv);
392	}
393
394	PUSHs ((SV *)CvPADLIST(cv));	348	PUSHs ((SV *)CvPADLIST (cv));
		349	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	350	PUSHs ((SV *)cv);
396		351
		352	CvDEPTH (cv) = 0;
397	get_padlist (cv); /* this is a monster */	353	get_padlist (cv);
398	}	354	}
399	}	355	}
		356	#ifdef CXt_FORMAT
400	else if (CxTYPE(cx) == CXt_FORMAT)	357	else if (CxTYPE (cx) == CXt_FORMAT)
401	{	358	{
402	/* I never used formats, so how should I know how these are implemented? */	359	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */	360	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	361	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}	362	}
		363	#endif
406	}	364	}
407	while (cxix >= 0);
408		365
409	if (top_si->si_type == PERLSI_MAIN)	366	if (top_si->si_type == PERLSI_MAIN)
410	break;	367	break;
411		368
412	top_si = top_si->si_prev;	369	top_si = top_si->si_prev;
…		…
419		376
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	377	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	378	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	379	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
423		380
424	/* I have not the slightest idea of why av_reify is necessary */	381	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	382	# include "state.h"
426	if (c->defav)	383	#undef VAR
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430
431	c->curstackinfo = PL_curstackinfo;
432	c->curstack = PL_curstack;
433	c->mainstack = PL_mainstack;
434	c->stack_sp = PL_stack_sp;
435	c->op = PL_op;
436	c->curpad = PL_curpad;
437	c->stack_base = PL_stack_base;
438	c->stack_max = PL_stack_max;
439	c->tmps_stack = PL_tmps_stack;
440	c->tmps_floor = PL_tmps_floor;
441	c->tmps_ix = PL_tmps_ix;
442	c->tmps_max = PL_tmps_max;
443	c->markstack = PL_markstack;
444	c->markstack_ptr = PL_markstack_ptr;
445	c->markstack_max = PL_markstack_max;
446	c->scopestack = PL_scopestack;
447	c->scopestack_ix = PL_scopestack_ix;
448	c->scopestack_max = PL_scopestack_max;
449	c->savestack = PL_savestack;
450	c->savestack_ix = PL_savestack_ix;
451	c->savestack_max = PL_savestack_max;
452	c->retstack = PL_retstack;
453	c->retstack_ix = PL_retstack_ix;
454	c->retstack_max = PL_retstack_max;
455	c->curcop = PL_curcop;
456	c->start_env = PL_start_env;
457	c->top_env = PL_top_env;
458	}	384	}
459		385
460	/*	386	/*
461	* allocate various perl stacks. This is an exact copy	387	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	388	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	389	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	390	* not usually need a lot of stackspace.
465	*/	391	*/
466	STATIC void	392	static void
467	coro_init_stacks (pTHX)	393	coro_init_stacks ()
468	{	394	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	395	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	396	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	397	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	398	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		399
474	PL_stack_base = AvARRAY(PL_curstack);	400	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	401	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	402	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		403
478	New(50,PL_tmps_stack,96,SV*);	404	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	405	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	406	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	407	PL_tmps_max = 128;
482		408
483	New(54,PL_markstack,16,I32);	409	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	410	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	411	PL_markstack_max = PL_markstack + 32;
486		412
		413	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	414	SET_MARK_OFFSET;
		415	#endif
488		416
489	New(54,PL_scopestack,16,I32);	417	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	418	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	419	PL_scopestack_max = 32;
492		420
493	New(54,PL_savestack,96,ANY);	421	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	422	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	423	PL_savestack_max = 64;
496		424
		425	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	426	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	427	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	428	PL_retstack_max = 16;
		429	#endif
500	}	430	}
501		431
502	/*	432	/*
503	* destroy the stacks, the callchain etc...	433	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	434	*/
506	STATIC void	435	static void
507	destroy_stacks(pTHX)	436	coro_destroy_stacks ()
508	{	437	{
		438	if (!IN_DESTRUCT)
		439	{
509	/* is this ugly, I ask? */	440	/* is this ugly, I ask? */
510	while (PL_scopestack_ix)	441	LEAVE_SCOPE (0);
511	LEAVE;
512		442
513	/* sure it is, but more important: is it correct?? :/ */	443	/* sure it is, but more important: is it correct?? :/ */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;	444	FREETMPS;
		445
		446	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		447	}
516		448
517	while (PL_curstackinfo->si_next)	449	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	450	PL_curstackinfo = PL_curstackinfo->si_next;
519		451
520	while (PL_curstackinfo)	452	while (PL_curstackinfo)
521	{	453	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	454	PERL_SI *p = PL_curstackinfo->si_prev;
523		455
524	{	456	{ /*D*//*remove*/
525	dSP;	457	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	458	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */	459	PUTBACK; /* possibly superfluous */
528	}	460	}
529		461
530	dounwind(-1);	462	if (!IN_DESTRUCT)
531		463	{
		464	dounwind (-1);/*D*//*remove*/
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	465	SvREFCNT_dec (PL_curstackinfo->si_stack);
		466	}
		467
533	Safefree(PL_curstackinfo->si_cxstack);	468	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	469	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	470	PL_curstackinfo = p;
536	}	471	}
537		472
538	Safefree(PL_tmps_stack);	473	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	474	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	475	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	476	Safefree (PL_savestack);
		477	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	478	Safefree (PL_retstack);
543	}
544
545	static void
546	allocate_stack (Coro__State ctx, int alloc)
547	{
548	coro_stack *stack;
549
550	New (0, stack, 1, coro_stack);
551
552	stack->refcnt = 1;
553	stack->usecnt = 1;
554	stack->gencnt = ctx->gencnt = 0;
555	if (alloc)
556	{
557	#ifdef HAVE_MMAP
558	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif	479	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}	480	}
573		481
574	static void	482	static void
575	deallocate_stack (Coro__State ctx)	483	setup_coro (struct coro *coro)
576	{
577	coro_stack *stack = ctx->stack;
578
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void
600	setup_coro (void *arg)
601	{	484	{
602	/*	485	/*
603	* emulate part of the perl startup here.	486	* emulate part of the perl startup here.
604	*/	487	*/
		488
		489	coro_init_stacks ();
		490
		491	PL_curcop = &PL_compiling;
		492	PL_in_eval = EVAL_NULL;
		493	PL_curpm = 0;
		494	PL_localizing = 0;
		495	PL_dirty = 0;
		496	PL_restartop = 0;
		497
		498	{
		499	dSP;
		500	LOGOP myop;
		501
		502	/* I have no idea why this is needed, but it is */
		503	PUSHMARK (SP);
		504
		505	SvREFCNT_dec (GvAV (PL_defgv));
		506	GvAV (PL_defgv) = coro->args; coro->args = 0;
		507
		508	Zero (&myop, 1, LOGOP);
		509	myop.op_next = Nullop;
		510	myop.op_flags = OPf_WANT_VOID;
		511
		512	PL_op = (OP *)&myop;
		513
		514	PUSHMARK (SP);
		515	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		516	PUTBACK;
		517	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		518	SPAGAIN;
		519	}
		520
		521	ENTER; /* necessary e.g. for dounwind */
		522	}
		523
		524	static void
		525	free_coro_mortal ()
		526	{
		527	if (coro_mortal)
		528	{
		529	SvREFCNT_dec (coro_mortal);
		530	coro_mortal = 0;
		531	}
		532	}
		533
		534	static void NOINLINE
		535	prepare_cctx (coro_cctx *cctx)
		536	{
605	dSP;	537	dSP;
606	Coro__State ctx = (Coro__State)arg;	538	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		539
609	coro_init_stacks (aTHX);	540	Zero (&myop, 1, LOGOP);
610	JMPENV_BOOTSTRAP;	541	myop.op_next = PL_op;
		542	myop.op_flags = OPf_WANT_VOID;
		543
		544	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		545
		546	PUSHMARK (SP);
		547	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		548	PUTBACK;
		549	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	550	SPAGAIN;
612
613	/*PL_curcop = 0;*/
614	SvREFCNT_dec (GvAV (PL_defgv));
615	GvAV (PL_defgv) = ctx->args;
616
617	if (ctx->stack)
618	{
619	ctx->cursp = 0;
620
621	PUSHMARK(SP);
622	PUTBACK;
623	(void) call_sv (sub_init, G_VOID|G_NOARGS);
624	croak ("FATAL: CCTXT coroutine returned!");
625	}
626	else
627	{
628	UNOP myop;
629
630	PL_op = (OP *)&myop;
631
632	Zero(&myop, 1, UNOP);
633	myop.op_next = Nullop;
634	myop.op_flags = OPf_WANT_VOID;
635
636	PUSHMARK(SP);
637	XPUSHs (sub_init);
638	/*
639	* the next line is slightly wrong, as PL_op->op_next
640	* is actually being executed so we skip the first op.
641	* that doesn't matter, though, since it is only
642	* pp_nextstate and we never return...
643	* ah yes, and I don't care anyways ;)
644	*/
645	PUTBACK;
646	PL_op = pp_entersub();
647	SPAGAIN;
648
649	ENTER; /* necessary e.g. for dounwind */
650	}
651	}	551	}
652		552
653	static void	553	static void
654	continue_coro (void *arg)	554	coro_run (void *arg)
655	{	555	{
		556	/* coro_run is the alternative epilogue of transfer() */
		557	UNLOCK;
		558
656	/*	559	/*
657	* this is a _very_ stripped down perl interpreter ;)	560	* this is a _very_ stripped down perl interpreter ;)
658	*/	561	*/
659	Coro__State ctx = (Coro__State)arg;	562	PL_top_env = &PL_start_env;
660		563
661	ctx->cursp = 0;	564	/* inject call to cctx_init */
662	PL_op = PL_op->op_next;	565	prepare_cctx ((coro_cctx *)arg);
663	CALLRUNOPS(aTHX);	566
664	/*NORETURN*/	567	/* somebody will hit me for both perl_run and PL_restartop */
		568	perl_run (PL_curinterp);
		569
		570	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
665	abort ();	571	abort ();
666	}	572	}
667		573
668	STATIC void	574	static coro_cctx *
		575	cctx_new ()
		576	{
		577	coro_cctx *cctx;
		578
		579	++cctx_count;
		580
		581	New (0, cctx, 1, coro_cctx);
		582
		583	#if HAVE_MMAP
		584
		585	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		586	/* mmap suppsedly does allocate-on-write for us */
		587	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		588
		589	if (cctx->sptr == (void *)-1)
		590	{
		591	perror ("FATAL: unable to mmap stack for coroutine");
		592	_exit (EXIT_FAILURE);
		593	}
		594
		595	# if STACKGUARD
		596	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		597	# endif
		598
		599	#else
		600
		601	cctx->ssize = STACKSIZE * (long)sizeof (long);
		602	New (0, cctx->sptr, STACKSIZE, long);
		603
		604	if (!cctx->sptr)
		605	{
		606	perror ("FATAL: unable to malloc stack for coroutine");
		607	_exit (EXIT_FAILURE);
		608	}
		609
		610	#endif
		611
		612	#if USE_VALGRIND
		613	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		614	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		615	cctx->ssize + (char *)cctx->sptr
		616	);
		617	#endif
		618
		619	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		620
		621	return cctx;
		622	}
		623
		624	static void
		625	cctx_destroy (coro_cctx *cctx)
		626	{
		627	if (!cctx)
		628	return;
		629
		630	--cctx_count;
		631
		632	#if USE_VALGRIND
		633	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		634	#endif
		635
		636	#if HAVE_MMAP
		637	munmap (cctx->sptr, cctx->ssize);
		638	#else
		639	Safefree (cctx->sptr);
		640	#endif
		641
		642	Safefree (cctx);
		643	}
		644
		645	static coro_cctx *
		646	cctx_get ()
		647	{
		648	coro_cctx *cctx;
		649
		650	if (cctx_first)
		651	{
		652	cctx = cctx_first;
		653	cctx_first = cctx->next;
		654	--cctx_idle;
		655	}
		656	else
		657	{
		658	cctx = cctx_new ();
		659	PL_op = PL_op->op_next;
		660	}
		661
		662	return cctx;
		663	}
		664
		665	static void
		666	cctx_put (coro_cctx *cctx)
		667	{
		668	/* free another cctx if overlimit */
		669	if (cctx_idle >= MAX_IDLE_CCTX)
		670	{
		671	coro_cctx *first = cctx_first;
		672	cctx_first = first->next;
		673	--cctx_idle;
		674
		675	assert (!first->inuse);
		676	cctx_destroy (first);
		677	}
		678
		679	++cctx_idle;
		680	cctx->next = cctx_first;
		681	cctx_first = cctx;
		682	}
		683
		684	/* never call directly, always through the coro_state_transfer global variable */
		685	static void NOINLINE
669	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	686	transfer (struct coro *prev, struct coro *next, int flags)
670	{	687	{
671	dSP;
672	dSTACKLEVEL;	688	dSTACKLEVEL;
673		689
		690	/* sometimes transfer is only called to set idle_sp */
		691	if (flags == TRANSFER_SET_STACKLEVEL)
		692	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
674	if (prev != next)	693	else if (prev != next)
675	{	694	{
676	if (next->mainstack)	695	coro_cctx *prev__cctx;
		696
		697	if (prev->flags & CF_NEW)
677	{	698	{
		699	/* create a new empty context */
		700	Newz (0, prev->cctx, 1, coro_cctx);
		701	prev->cctx->inuse = 1;
		702	prev->flags &= ~CF_NEW;
		703	prev->flags |= CF_RUNNING;
		704	}
		705
		706	/*TODO: must not croak here */
		707	if (!prev->flags & CF_RUNNING)
		708	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		709
		710	if (next->flags & CF_RUNNING)
		711	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		712
		713	prev->flags &= ~CF_RUNNING;
		714	next->flags |= CF_RUNNING;
		715
		716	LOCK;
		717
		718	if (next->flags & CF_NEW)
		719	{
		720	/* need to start coroutine */
		721	next->flags &= ~CF_NEW;
		722	/* first get rid of the old state */
		723	SAVE (prev, -1);
		724	/* setup coroutine call */
		725	setup_coro (next);
		726	/* need a new stack */
		727	assert (!next->stack);
		728	}
		729	else
		730	{
		731	/* coroutine already started */
678	SAVE (prev, flags);	732	SAVE (prev, flags);
679	LOAD (next);	733	LOAD (next);
680
681	/* mark this state as in-use */
682	next->mainstack = 0;
683	next->tmps_ix = -2;
684
685	/* stacklevel changed? if yes, grab the stack for us! */
686	if (flags & TRANSFER_SAVE_CCTXT)
687	{
688	if (!prev->stack)
689	allocate_stack (prev, 0);
690	else if (prev->cursp != stacklevel
691	&& prev->stack->usecnt > 1)
692	{
693	prev->gencnt = ++prev->stack->gencnt;
694	prev->stack->usecnt = 1;
695	}
696
697	/* has our stack been invalidated? */
698	if (next->stack && next->stack->gencnt != next->gencnt)
699	{
700	deallocate_stack (next);
701	allocate_stack (next, 1);
702	coro_create (&(next->stack->cctx),
703	continue_coro, (void *)next,
704	next->stack->sptr, labs (next->stack->ssize));
705	}
706
707	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
708	}
709
710	}	734	}
711	else if (next->tmps_ix == -2)	735
712	croak ("tried to transfer to running coroutine");	736	prev__cctx = prev->cctx;
713	else	737
		738	/* possibly "free" the cctx */
		739	if (prev__cctx->idle_sp == STACKLEVEL)
714	{	740	{
715	SAVE (prev, -1); /* first get rid of the old state */	741	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		742	assert (PL_top_env == prev__cctx->top_env);
716		743
717	if (flags & TRANSFER_SAVE_CCTXT)	744	prev->cctx = 0;
718	{
719	if (!prev->stack)
720	allocate_stack (prev, 0);
721		745
722	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)	746	cctx_put (prev__cctx);
723	{	747	prev__cctx->inuse = 0;
724	setup_coro (next);
725
726	prev->stack->refcnt++;
727	prev->stack->usecnt++;
728	next->stack = prev->stack;
729	next->gencnt = prev->gencnt;
730	}
731	else
732	{
733	allocate_stack (next, 1);
734	coro_create (&(next->stack->cctx),
735	setup_coro, (void *)next,
736	next->stack->sptr, labs (next->stack->ssize));
737	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
738	}
739	}
740	else
741	setup_coro (next);
742	}	748	}
		749
		750	if (!next->cctx)
		751	{
		752	next->cctx = cctx_get ();
		753	assert (!next->cctx->inuse);
		754	next->cctx->inuse = 1;
		755	}
		756
		757	if (prev__cctx != next->cctx)
		758	{
		759	prev__cctx->top_env = PL_top_env;
		760	PL_top_env = next->cctx->top_env;
		761	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		762	}
		763
		764	free_coro_mortal ();
		765
		766	UNLOCK;
743	}	767	}
		768	}
744		769
745	next->cursp = stacklevel;	770	struct transfer_args
		771	{
		772	struct coro *prev, *next;
		773	int flags;
		774	};
		775
		776	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		777
		778	static void
		779	coro_state_destroy (struct coro *coro)
		780	{
		781	if (coro->refcnt--)
		782	return;
		783
		784	if (coro->mainstack && coro->mainstack != main_mainstack)
		785	{
		786	struct coro temp;
		787
		788	if (coro->flags & CF_RUNNING)
		789	croak ("FATAL: tried to destroy currently running coroutine");
		790
		791	SAVE ((&temp), TRANSFER_SAVE_ALL);
		792	LOAD (coro);
		793
		794	coro_destroy_stacks ();
		795
		796	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		797
		798	coro->mainstack = 0;
		799	}
		800
		801	cctx_destroy (coro->cctx);
		802	SvREFCNT_dec (coro->args);
		803	Safefree (coro);
		804	}
		805
		806	static int
		807	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		808	{
		809	struct coro *coro = (struct coro *)mg->mg_ptr;
		810	mg->mg_ptr = 0;
		811
		812	coro_state_destroy (coro);
		813
		814	return 0;
		815	}
		816
		817	static int
		818	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		819	{
		820	struct coro *coro = (struct coro *)mg->mg_ptr;
		821
		822	++coro->refcnt;
		823
		824	return 0;
		825	}
		826
		827	static MGVTBL coro_state_vtbl = {
		828	0, 0, 0, 0,
		829	coro_state_clear,
		830	0,
		831	#ifdef MGf_DUP
		832	coro_state_dup,
		833	#else
		834	# define MGf_DUP 0
		835	#endif
		836	};
		837
		838	static struct coro *
		839	SvSTATE (SV *coro)
		840	{
		841	HV *stash;
		842	MAGIC *mg;
		843
		844	if (SvROK (coro))
		845	coro = SvRV (coro);
		846
		847	stash = SvSTASH (coro);
		848	if (stash != coro_stash && stash != coro_state_stash)
		849	{
		850	/* very slow, but rare, check */
		851	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		852	croak ("Coro::State object required");
		853	}
		854
		855	mg = SvMAGIC (coro);
		856	assert (mg->mg_type == PERL_MAGIC_ext);
		857	return (struct coro *)mg->mg_ptr;
		858	}
		859
		860	static void
		861	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		862	{
		863	ta->prev = SvSTATE (prev);
		864	ta->next = SvSTATE (next);
		865	ta->flags = flags;
		866	}
		867
		868	static void
		869	api_transfer (SV *prev, SV *next, int flags)
		870	{
		871	struct transfer_args ta;
		872
		873	prepare_transfer (&ta, prev, next, flags);
		874	TRANSFER (ta);
		875	}
		876
		877	/** Coro ********************************************************************/
		878
		879	#define PRIO_MAX 3
		880	#define PRIO_HIGH 1
		881	#define PRIO_NORMAL 0
		882	#define PRIO_LOW -1
		883	#define PRIO_IDLE -3
		884	#define PRIO_MIN -4
		885
		886	/* for Coro.pm */
		887	static SV *coro_current;
		888	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		889	static int coro_nready;
		890
		891	static void
		892	coro_enq (SV *coro_sv)
		893	{
		894	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		895	coro_nready++;
		896	}
		897
		898	static SV *
		899	coro_deq (int min_prio)
		900	{
		901	int prio = PRIO_MAX - PRIO_MIN;
		902
		903	min_prio -= PRIO_MIN;
		904	if (min_prio < 0)
		905	min_prio = 0;
		906
		907	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		908	if (AvFILLp (coro_ready [prio]) >= 0)
		909	{
		910	coro_nready--;
		911	return av_shift (coro_ready [prio]);
		912	}
		913
		914	return 0;
		915	}
		916
		917	static int
		918	api_ready (SV *coro_sv)
		919	{
		920	struct coro *coro;
		921
		922	if (SvROK (coro_sv))
		923	coro_sv = SvRV (coro_sv);
		924
		925	coro = SvSTATE (coro_sv);
		926
		927	if (coro->flags & CF_READY)
		928	return 0;
		929
		930	#if 0 /* this is actually harmless */
		931	if (coro->flags & CF_RUNNING)
		932	croak ("Coro::ready called on currently running coroutine");
		933	#endif
		934
		935	coro->flags |= CF_READY;
		936
		937	LOCK;
		938	coro_enq (SvREFCNT_inc (coro_sv));
		939	UNLOCK;
		940
		941	return 1;
		942	}
		943
		944	static int
		945	api_is_ready (SV *coro_sv)
		946	{
		947	return !!SvSTATE (coro_sv)->flags & CF_READY;
		948	}
		949
		950	static void
		951	prepare_schedule (struct transfer_args *ta)
		952	{
		953	SV *prev, *next;
		954
		955	for (;;)
		956	{
		957	LOCK;
		958	next = coro_deq (PRIO_MIN);
		959	UNLOCK;
		960
		961	if (next)
		962	break;
		963
		964	{
		965	dSP;
		966
		967	ENTER;
		968	SAVETMPS;
		969
		970	PUSHMARK (SP);
		971	PUTBACK;
		972	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		973
		974	FREETMPS;
		975	LEAVE;
		976	}
		977	}
		978
		979	prev = SvRV (coro_current);
		980	SvRV_set (coro_current, next);
		981
		982	/* free this only after the transfer */
		983	LOCK;
		984	free_coro_mortal ();
		985	UNLOCK;
		986	coro_mortal = prev;
		987
		988	assert (!SvROK(prev));//D
		989	assert (!SvROK(next));//D
		990
		991	ta->prev = SvSTATE (prev);
		992	ta->next = SvSTATE (next);
		993	ta->flags = TRANSFER_SAVE_ALL;
		994
		995	assert (ta->flags & CF_READY);
		996	ta->next->flags &= ~CF_READY;
		997	}
		998
		999	static void
		1000	prepare_cede (struct transfer_args *ta)
		1001	{
		1002	api_ready (coro_current);
		1003
		1004	prepare_schedule (ta);
		1005	}
		1006
		1007	static void
		1008	api_schedule (void)
		1009	{
		1010	struct transfer_args ta;
		1011
		1012	prepare_schedule (&ta);
		1013	TRANSFER (ta);
		1014	}
		1015
		1016	static void
		1017	api_cede (void)
		1018	{
		1019	struct transfer_args ta;
		1020
		1021	prepare_cede (&ta);
		1022	TRANSFER (ta);
746	}	1023	}
747		1024
748	MODULE = Coro::State PACKAGE = Coro::State	1025	MODULE = Coro::State PACKAGE = Coro::State
749		1026
750	PROTOTYPES: ENABLE	1027	PROTOTYPES: DISABLE
751		1028
752	BOOT:	1029	BOOT:
753	{ /* {} necessary for stoopid perl-5.6.x */	1030	{
754	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1031	#ifdef USE_ITHREADS
755	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1032	MUTEX_INIT (&coro_mutex);
		1033	#endif
		1034	BOOT_PAGESIZE;
		1035
756	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1036	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
757		1037
758	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1038	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
759	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1039	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
760	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1040	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
761	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
762
763	if (!padlist_cache)
764	padlist_cache = newHV ();
765		1041
766	main_mainstack = PL_mainstack;	1042	main_mainstack = PL_mainstack;
767	}
768		1043
769	Coro::State	1044	coroapi.ver = CORO_API_VERSION;
770	_newprocess(args)	1045	coroapi.transfer = api_transfer;
771	SV * args	1046
772	PROTOTYPE: $	1047	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1048	}
		1049
		1050	SV *
		1051	new (char *klass, ...)
773	CODE:	1052	CODE:
774	Coro__State coro;	1053	{
		1054	struct coro *coro;
		1055	HV *hv;
		1056	int i;
775		1057
776	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
777	croak ("Coro::State::_newprocess expects an arrayref");
778
779	New (0, coro, 1, struct coro);	1058	Newz (0, coro, 1, struct coro);
		1059	coro->args = newAV ();
		1060	coro->flags = CF_NEW;
780		1061
781	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1062	hv = newHV ();
782	coro->mainstack = 0; /* actual work is done inside transfer */	1063	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
783	coro->stack = 0;	1064	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
784		1065
785	RETVAL = coro;	1066	for (i = 1; i < items; i++)
		1067	av_push (coro->args, newSVsv (ST (i)));
		1068	}
786	OUTPUT:	1069	OUTPUT:
787	RETVAL	1070	RETVAL
788		1071
789	void	1072	void
790	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1073	_set_stacklevel (...)
791	Coro::State_or_hashref prev	1074	ALIAS:
792	Coro::State_or_hashref next	1075	Coro::State::transfer = 1
793	int flags	1076	Coro::schedule = 2
794	PROTOTYPE: @	1077	Coro::cede = 3
795	CODE:	1078	CODE:
796	transfer (aTHX_ prev, next, flags);	1079	{
		1080	struct transfer_args ta;
		1081
		1082	switch (ix)
		1083	{
		1084	case 0:
		1085	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1086	ta.next = 0;
		1087	ta.flags = TRANSFER_SET_STACKLEVEL;
		1088	break;
		1089
		1090	case 1:
		1091	if (items != 3)
		1092	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1093
		1094	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1095	break;
		1096
		1097	case 2:
		1098	prepare_schedule (&ta);
		1099	break;
		1100
		1101	case 3:
		1102	prepare_cede (&ta);
		1103	break;
		1104	}
		1105
		1106	TRANSFER (ta);
		1107	}
797		1108
798	void	1109	void
799	DESTROY(coro)	1110	_clone_state_from (SV *dst, SV *src)
800	Coro::State coro	1111	CODE:
		1112	{
		1113	struct coro *coro_src = SvSTATE (src);
		1114
		1115	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1116
		1117	++coro_src->refcnt;
		1118	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1119	}
		1120
		1121	void
		1122	_exit (code)
		1123	int code
		1124	PROTOTYPE: $
		1125	CODE:
		1126	_exit (code);
		1127
		1128	int
		1129	cctx_count ()
		1130	CODE:
		1131	RETVAL = cctx_count;
		1132	OUTPUT:
		1133	RETVAL
		1134
		1135	int
		1136	cctx_idle ()
		1137	CODE:
		1138	RETVAL = cctx_idle;
		1139	OUTPUT:
		1140	RETVAL
		1141
		1142	MODULE = Coro::State PACKAGE = Coro
		1143
		1144	BOOT:
		1145	{
		1146	int i;
		1147
		1148	coro_stash = gv_stashpv ("Coro", TRUE);
		1149
		1150	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1151	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1152	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1153	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1154	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1155	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1156
		1157	coro_current = get_sv ("Coro::current", FALSE);
		1158	SvREADONLY_on (coro_current);
		1159
		1160	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1161	coro_ready[i] = newAV ();
		1162
		1163	{
		1164	SV *sv = perl_get_sv("Coro::API", 1);
		1165
		1166	coroapi.schedule = api_schedule;
		1167	coroapi.cede = api_cede;
		1168	coroapi.ready = api_ready;
		1169	coroapi.is_ready = api_is_ready;
		1170	coroapi.nready = &coro_nready;
		1171	coroapi.current = coro_current;
		1172
		1173	GCoroAPI = &coroapi;
		1174	sv_setiv (sv, (IV)&coroapi);
		1175	SvREADONLY_on (sv);
		1176	}
		1177	}
		1178
		1179	int
		1180	prio (Coro::State coro, int newprio = 0)
		1181	ALIAS:
		1182	nice = 1
801	CODE:	1183	CODE:
		1184	{
		1185	RETVAL = coro->prio;
802		1186
803	if (coro->mainstack && coro->mainstack != main_mainstack)	1187	if (items > 1)
804	{	1188	{
805	struct coro temp;	1189	if (ix)
		1190	newprio += coro->prio;
806		1191
807	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1192	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
808	LOAD(aTHX_ coro);	1193	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
809		1194
810	destroy_stacks (aTHX);	1195	coro->prio = newprio;
811
812	LOAD((&temp)); /* this will get rid of defsv etc.. */
813
814	coro->mainstack = 0;
815	}	1196	}
		1197	}
816		1198
817	deallocate_stack (coro);	1199	SV *
		1200	ready (SV *self)
		1201	PROTOTYPE: $
		1202	CODE:
		1203	RETVAL = boolSV (api_ready (self));
		1204	OUTPUT:
		1205	RETVAL
818		1206
819	Safefree (coro);	1207	SV *
		1208	is_ready (SV *self)
		1209	PROTOTYPE: $
		1210	CODE:
		1211	RETVAL = boolSV (api_is_ready (self));
		1212	OUTPUT:
		1213	RETVAL
		1214
		1215	int
		1216	nready (...)
		1217	PROTOTYPE:
		1218	CODE:
		1219	RETVAL = coro_nready;
		1220	OUTPUT:
		1221	RETVAL
820		1222
821	void	1223	void
822	flush()	1224	_set_current (SV *current)
		1225	PROTOTYPE: $
823	CODE:	1226	CODE:
824	#ifdef MAY_FLUSH	1227	SvREFCNT_dec (SvRV (coro_current));
825	flush_padlist_cache ();	1228	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
826	#endif
827		1229
828	MODULE = Coro::State PACKAGE = Coro::Cont	1230	MODULE = Coro::State PACKAGE = Coro::AIO
829		1231
830	# this is slightly dirty	1232	SV *
		1233	_get_state ()
		1234	CODE:
		1235	{
		1236	struct {
		1237	int errorno;
		1238	int laststype;
		1239	int laststatval;
		1240	Stat_t statcache;
		1241	} data;
		1242
		1243	data.errorno = errno;
		1244	data.laststype = PL_laststype;
		1245	data.laststatval = PL_laststatval;
		1246	data.statcache = PL_statcache;
		1247
		1248	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1249	}
		1250	OUTPUT:
		1251	RETVAL
831		1252
832	void	1253	void
833	yield(...)	1254	_set_state (char *data_)
834	PROTOTYPE: @	1255	PROTOTYPE: $
835	CODE:	1256	CODE:
836	static SV *returnstk;	1257	{
837	SV *sv;	1258	struct {
838	AV *defav = GvAV (PL_defgv);	1259	int errorno;
839	struct coro *prev, *next;	1260	int laststype;
		1261	int laststatval;
		1262	Stat_t statcache;
		1263	} *data = (void *)data_;
840		1264
841	if (!returnstk)	1265	errno = data->errorno;
842	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1266	PL_laststype = data->laststype;
843		1267	PL_laststatval = data->laststatval;
844	/* set up @_ -- ugly */	1268	PL_statcache = data->statcache;
845	av_clear (defav);	1269	}
846	av_fill (defav, items - 1);
847	while (items--)
848	av_store (defav, items, SvREFCNT_inc (ST(items)));
849
850	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
851	sv = av_pop ((AV *)SvRV (returnstk));
852	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
853	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
854	SvREFCNT_dec (sv);
855
856	transfer(aTHX_ prev, next, 0);
857

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