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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.14 by root, Mon Jul 23 23:48:05 2001 UTC vs.
Revision 1.121 by root, Sat Dec 2 20:40:25 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>
		57	# ifndef MAP_ANONYMOUS
		58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
		60	# else
		61	# undef HAVE_MMAP
		62	# endif
10	#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
		71	# endif
		72	#else
		73	# define PAGESIZE 0
		74	# define BOOT_PAGESIZE (void)0
		75	#endif
11		76
12	#define MAY_FLUSH /* increases codesize */	77	/* The next macro should declare a variable stacklevel that contains and approximation
		78	* to the current C stack pointer. Its property is that it changes with each call
		79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
		81	#define STACKLEVEL ((void *)&stacklevel)
13		82
14	#define TRANSFER_SAVE_DEFAV 0x00000001	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
15	#define TRANSFER_SAVE_DEFSV 0x00000002
16	#define TRANSFER_SAVE_ERRSV 0x00000004
17	#define TRANSFER_SAVE_CCTXT 0x00000008
18		84
19	#define TRANSFER_SAVE_ALL -1	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
20		90
21	#define SUB_INIT "Coro::State::initialize"	91	#define NOINLINE attribute ((noinline))
22	#define UCORO_STATE "_coro_state"
23		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	struct io_state
		107	{
		108	int errorno;
		109	I32 laststype;
		110	int laststatval;
		111	Stat_t statcache;
		112	};
		113
		114	static struct CoroAPI coroapi;
		115	static AV *main_mainstack; /* used to differentiate between $main and others */
		116	static HV *coro_state_stash, *coro_stash;
		117	static SV *coro_mortal; /* will be freed after next transfer */
		118
		119	static struct coro_cctx *cctx_first;
		120	static int cctx_count, cctx_idle;
		121
		122	/* this is a structure representing a c-level coroutine */
		123	typedef struct coro_cctx {
		124	struct coro_cctx *next;
		125
		126	/* the stack */
		127	void *sptr;
		128	long ssize; /* positive == mmap, otherwise malloc */
		129
		130	/* cpu state */
		131	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		132	JMPENV *top_env;
		133	coro_context cctx;
		134
		135	int inuse;
		136
		137	#if USE_VALGRIND
		138	int valgrind_id;
		139	#endif
		140	} coro_cctx;
		141
		142	enum {
		143	CF_RUNNING = 0x0001, /* coroutine is running */
		144	CF_READY = 0x0002, /* coroutine is ready */
		145	CF_NEW = 0x0004, /* ahs never been switched to */
		146	};
		147
		148	/* this is a structure representing a perl-level coroutine */
24	struct coro {	149	struct coro {
25	/* the optional C context */	150	/* the c coroutine allocated to this perl coroutine, if any */
26	coro_context cctx;	151	coro_cctx *cctx;
27	void *sptr;	152
28	long ssize;	153	/* data associated with this coroutine (initial args) */
		154	AV *args;
		155	int refcnt;
		156	int flags;
29		157
30	/* optionally saved, might be zero */	158	/* optionally saved, might be zero */
31	AV *defav;	159	AV *defav;
32	SV *defsv;	160	SV *defsv;
33	SV *errsv;	161	SV *errsv;
34		162
35	/* saved global state not related to stacks */	163	#define VAR(name,type) type name;
36	U8 dowarn;	164	# include "state.h"
		165	#undef VAR
37		166
38	/* the stacks and related info (callchain etc..) */	167	/* coro process data */
39	PERL_SI *curstackinfo;	168	int prio;
40	AV *curstack;
41	AV *mainstack;
42	SV **stack_sp;
43	OP *op;
44	SV **curpad;
45	SV **stack_base;
46	SV **stack_max;
47	SV **tmps_stack;
48	I32 tmps_floor;
49	I32 tmps_ix;
50	I32 tmps_max;
51	I32 *markstack;
52	I32 *markstack_ptr;
53	I32 *markstack_max;
54	I32 *scopestack;
55	I32 scopestack_ix;
56	I32 scopestack_max;
57	ANY *savestack;
58	I32 savestack_ix;
59	I32 savestack_max;
60	OP **retstack;
61	I32 retstack_ix;
62	I32 retstack_max;
63	COP *curcop;
64	JMPENV start_env;
65	JMPENV *top_env;
66
67	/* data associated with this coroutine (initial args) */
68	AV *args;
69	};	169	};
70		170
71	typedef struct coro *Coro__State;	171	typedef struct coro *Coro__State;
72	typedef struct coro *Coro__State_or_hashref;	172	typedef struct coro *Coro__State_or_hashref;
73		173
74	static AV *main_mainstack; /* used to differentiate between $main and others */	174	static AV *
75	static HV *coro_state_stash;	175	coro_clone_padlist (CV *cv)
76	static SV *ucoro_state_sv;
77	static U32 ucoro_state_hash;
78	static HV *padlist_cache;
79
80	/* mostly copied from op.c:cv_clone2 */
81	STATIC AV *
82	clone_padlist (AV *protopadlist)
83	{	176	{
84	AV *av;	177	AV *padlist = CvPADLIST (cv);
85	I32 ix;
86	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
87	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
88	SV **pname = AvARRAY (protopad_name);
89	SV **ppad = AvARRAY (protopad);
90	I32 fname = AvFILLp (protopad_name);
91	I32 fpad = AvFILLp (protopad);
92	AV *newpadlist, *newpad_name, *newpad;	178	AV *newpadlist, *newpad;
93	SV **npad;
94
95	newpad_name = newAV ();
96	for (ix = fname; ix >= 0; ix--)
97	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
98
99	newpad = newAV ();
100	av_fill (newpad, AvFILLp (protopad));
101	npad = AvARRAY (newpad);
102		179
103	newpadlist = newAV ();	180	newpadlist = newAV ();
104	AvREAL_off (newpadlist);	181	AvREAL_off (newpadlist);
105	av_store (newpadlist, 0, (SV *) newpad_name);	182	#if PERL_VERSION_ATLEAST (5,9,0)
		183	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		184	#else
		185	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		186	#endif
		187	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		188	--AvFILLp (padlist);
		189
		190	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
106	av_store (newpadlist, 1, (SV *) newpad);	191	av_store (newpadlist, 1, (SV *)newpad);
107		192
108	av = newAV (); /* will be @_ */	193	return newpadlist;
109	av_extend (av, 0);	194	}
110	av_store (newpad, 0, (SV *) av);
111	AvFLAGS (av) = AVf_REIFY;
112		195
113	for (ix = fpad; ix > 0; ix--)	196	static void
		197	free_padlist (AV *padlist)
		198	{
		199	/* may be during global destruction */
		200	if (SvREFCNT (padlist))
114	{	201	{
115	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	202	I32 i = AvFILLp (padlist);
116	if (namesv && namesv != &PL_sv_undef)	203	while (i >= 0)
117	{	204	{
118	char *name = SvPVX (namesv); /* XXX */	205	SV **svp = av_fetch (padlist, i--, FALSE);
119	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	206	if (svp)
120	{ /* lexical from outside? */
121	npad[ix] = SvREFCNT_inc (ppad[ix]);
122	}	207	{
123	else
124	{ /* our own lexical */
125	SV *sv;	208	SV *sv;
126	if (*name == '&')	209	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
127	sv = SvREFCNT_inc (ppad[ix]);	210	SvREFCNT_dec (sv);
128	else if (*name == '@')	211
129	sv = (SV *) newAV ();	212	SvREFCNT_dec (*svp);
130	else if (*name == '%')
131	sv = (SV *) newHV ();
132	else
133	sv = NEWSV (0, 0);
134	if (!SvPADBUSY (sv))
135	SvPADMY_on (sv);
136	npad[ix] = sv;
137	}	213	}
138	}	214	}
139	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	215
140	{	216	SvREFCNT_dec ((SV*)padlist);
141	npad[ix] = SvREFCNT_inc (ppad[ix]);
142	}
143	else
144	{
145	SV *sv = NEWSV (0, 0);
146	SvPADTMP_on (sv);
147	npad[ix] = sv;
148	}
149	}	217	}
		218	}
150		219
151	#if 0 /* return -ENOTUNDERSTOOD */	220	static int
152	/* Now that vars are all in place, clone nested closures. */	221	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		222	{
		223	AV *padlist;
		224	AV *av = (AV *)mg->mg_obj;
153		225
154	for (ix = fpad; ix > 0; ix--) {	226	/* casting is fun. */
155	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	227	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
156	if (namesv	228	free_padlist (padlist);
157	&& namesv != &PL_sv_undef	229
158	&& !(SvFLAGS(namesv) & SVf_FAKE)	230	SvREFCNT_dec (av);
159	&& *SvPVX(namesv) == '&'	231
160	&& CvCLONE(ppad[ix]))	232	return 0;
161	{	233	}
162	CV *kid = cv_clone((CV*)ppad[ix]);	234
163	SvREFCNT_dec(ppad[ix]);	235	#define PERL_MAGIC_coro PERL_MAGIC_ext
164	CvCLONE_on(kid);	236
165	SvPADMY_on(kid);	237	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
166	npad[ix] = (SV*)kid;	238
167	}	239	#define CORO_MAGIC(cv) \
		240	SvMAGIC (cv) \
		241	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		242	? SvMAGIC (cv) \
		243	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		244	: 0
		245
		246	/* the next two functions merely cache the padlists */
		247	static void
		248	get_padlist (CV *cv)
		249	{
		250	MAGIC *mg = CORO_MAGIC (cv);
		251	AV *av;
		252
		253	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		254	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		255	else
		256	{
		257	#if 0
		258	/* this is probably cleaner, but also slower? */
		259	CV *cp = Perl_cv_clone (cv);
		260	CvPADLIST (cv) = CvPADLIST (cp);
		261	CvPADLIST (cp) = 0;
		262	SvREFCNT_dec (cp);
		263	#else
		264	CvPADLIST (cv) = coro_clone_padlist (cv);
		265	#endif
		266	}
		267	}
		268
		269	static void
		270	put_padlist (CV *cv)
		271	{
		272	MAGIC *mg = CORO_MAGIC (cv);
		273	AV *av;
		274
		275	if (!mg)
		276	{
		277	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		278	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		279	mg->mg_virtual = &vtbl_coro;
		280	mg->mg_obj = (SV *)newAV ();
168	}	281	}
169	#endif
170		282
171	return newpadlist;	283	av = (AV *)mg->mg_obj;
172	}
173		284
174	#ifdef MAY_FLUSH	285	if (AvFILLp (av) >= AvMAX (av))
175	STATIC AV *	286	av_extend (av, AvMAX (av) + 1);
176	free_padlist (AV *padlist)
177	{
178	/* may be during global destruction */
179	if (SvREFCNT(padlist))
180	{
181	I32 i = AvFILLp(padlist);
182	while (i >= 0)
183	{
184	SV **svp = av_fetch(padlist, i--, FALSE);
185	SV *sv = svp ? *svp : Nullsv;
186	if (sv)
187	SvREFCNT_dec(sv);
188	}
189		287
190	SvREFCNT_dec((SV*)padlist);	288	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
191	}
192	}	289	}
193	#endif
194
195	/* the next two functions merely cache the padlists */
196	STATIC void
197	get_padlist (CV *cv)
198	{
199	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
200
201	if (he && AvFILLp ((AV *)*he) >= 0)
202	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
203	else
204	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
205	}
206
207	STATIC void
208	put_padlist (CV *cv)
209	{
210	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
211
212	if (SvTYPE (*he) != SVt_PVAV)
213	{
214	SvREFCNT_dec (*he);
215	*he = (SV *)newAV ();
216	}
217
218	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
219	}
220
221	#ifdef MAY_FLUSH
222	STATIC void
223	flush_padlist_cache ()
224	{
225	HV *hv = padlist_cache;
226	padlist_cache = newHV ();
227
228	if (hv_iterinit (hv))
229	{
230	HE *he;
231	AV *padlist;
232
233	while (!!(he = hv_iternext (hv)))
234	{
235	AV *av = (AV *)HeVAL(he);
236
237	/* casting is fun. */
238	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
239	free_padlist (padlist);
240	}
241	}
242
243	SvREFCNT_dec (hv);
244	}
245	#endif
246		290
247	#define SB do {	291	#define SB do {
248	#define SE } while (0)	292	#define SE } while (0)
249		293
250	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	294	#define LOAD(state) load_state ((state))
251	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	295	#define SAVE(state,flags) save_state ((state),(flags))
252		296
253	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	297	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
254		298
255	static void	299	static void
256	load_state(pTHX_ Coro__State c)	300	load_state (Coro__State c)
257	{	301	{
258	PL_dowarn = c->dowarn;	302	#define VAR(name,type) PL_ ## name = c->name;
259		303	# include "state.h"
260	PL_curstackinfo = c->curstackinfo;	304	#undef VAR
261	PL_curstack = c->curstack;
262	PL_mainstack = c->mainstack;
263	PL_stack_sp = c->stack_sp;
264	PL_op = c->op;
265	PL_curpad = c->curpad;
266	PL_stack_base = c->stack_base;
267	PL_stack_max = c->stack_max;
268	PL_tmps_stack = c->tmps_stack;
269	PL_tmps_floor = c->tmps_floor;
270	PL_tmps_ix = c->tmps_ix;
271	PL_tmps_max = c->tmps_max;
272	PL_markstack = c->markstack;
273	PL_markstack_ptr = c->markstack_ptr;
274	PL_markstack_max = c->markstack_max;
275	PL_scopestack = c->scopestack;
276	PL_scopestack_ix = c->scopestack_ix;
277	PL_scopestack_max = c->scopestack_max;
278	PL_savestack = c->savestack;
279	PL_savestack_ix = c->savestack_ix;
280	PL_savestack_max = c->savestack_max;
281	PL_retstack = c->retstack;
282	PL_retstack_ix = c->retstack_ix;
283	PL_retstack_max = c->retstack_max;
284	PL_curcop = c->curcop;
285	PL_start_env = c->start_env;
286	PL_top_env = c->top_env;
287		305
288	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	306	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
289	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	307	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
290	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	308	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
291		309
…		…
294	CV *cv;	312	CV *cv;
295		313
296	/* now do the ugly restore mess */	314	/* now do the ugly restore mess */
297	while ((cv = (CV *)POPs))	315	while ((cv = (CV *)POPs))
298	{	316	{
299	AV *padlist = (AV *)POPs;
300
301	if (padlist)
302	{
303	put_padlist (cv); /* mark this padlist as available */	317	put_padlist (cv); /* mark this padlist as available */
304	CvPADLIST(cv) = padlist;	318	CvDEPTH (cv) = PTR2IV (POPs);
305	#ifdef USE_THREADS	319	CvPADLIST (cv) = (AV *)POPs;
306	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
307	#endif
308	}
309
310	++CvDEPTH(cv);
311	}	320	}
312		321
313	PUTBACK;	322	PUTBACK;
314	}	323	}
315	}	324	}
316		325
317	static void	326	static void
318	save_state(pTHX_ Coro__State c, int flags)	327	save_state (Coro__State c, int flags)
319	{	328	{
320	{	329	{
321	dSP;	330	dSP;
322	I32 cxix = cxstack_ix;	331	I32 cxix = cxstack_ix;
323	PERL_CONTEXT *ccstk = cxstack;	332	PERL_CONTEXT *ccstk = cxstack;
…		…
330		339
331	PUSHs (Nullsv);	340	PUSHs (Nullsv);
332	/* this loop was inspired by pp_caller */	341	/* this loop was inspired by pp_caller */
333	for (;;)	342	for (;;)
334	{	343	{
335	do	344	while (cxix >= 0)
336	{	345	{
337	PERL_CONTEXT *cx = &ccstk[cxix--];	346	PERL_CONTEXT *cx = &ccstk[cxix--];
338		347
339	if (CxTYPE(cx) == CXt_SUB)	348	if (CxTYPE (cx) == CXt_SUB)
340	{	349	{
341	CV *cv = cx->blk_sub.cv;	350	CV *cv = cx->blk_sub.cv;
		351
342	if (CvDEPTH(cv))	352	if (CvDEPTH (cv))
343	{	353	{
344	#ifdef USE_THREADS
345	/*XPUSHs ((SV *)CvOWNER(cv));*/
346	/*CvOWNER(cv) = 0;*/
347	/*error must unlock this cv etc.. etc...*/
348	#endif
349	EXTEND (SP, CvDEPTH(cv)*2);	354	EXTEND (SP, 3);
350		355
351	while (--CvDEPTH(cv))
352	{
353	/* this tells the restore code to increment CvDEPTH */
354	PUSHs (Nullsv);
355	PUSHs ((SV *)cv);
356	}
357
358	PUSHs ((SV *)CvPADLIST(cv));	356	PUSHs ((SV *)CvPADLIST (cv));
		357	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
359	PUSHs ((SV *)cv);	358	PUSHs ((SV *)cv);
360		359
		360	CvDEPTH (cv) = 0;
361	get_padlist (cv); /* this is a monster */	361	get_padlist (cv);
362	}	362	}
363	}	363	}
		364	#ifdef CXt_FORMAT
364	else if (CxTYPE(cx) == CXt_FORMAT)	365	else if (CxTYPE (cx) == CXt_FORMAT)
365	{	366	{
366	/* I never used formats, so how should I know how these are implemented? */	367	/* I never used formats, so how should I know how these are implemented? */
367	/* my bold guess is as a simple, plain sub... */	368	/* my bold guess is as a simple, plain sub... */
368	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	369	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
369	}	370	}
		371	#endif
370	}	372	}
371	while (cxix >= 0);
372		373
373	if (top_si->si_type == PERLSI_MAIN)	374	if (top_si->si_type == PERLSI_MAIN)
374	break;	375	break;
375		376
376	top_si = top_si->si_prev;	377	top_si = top_si->si_prev;
…		…
383		384
384	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	385	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
385	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	386	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
386	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	387	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
387		388
388	/* I have not the slightest idea of why av_reify is necessary */	389	#define VAR(name,type)c->name = PL_ ## name;
389	/* but if it's missing the defav contents magically get replaced sometimes */	390	# include "state.h"
390	if (c->defav)	391	#undef VAR
391	av_reify (c->defav);
392
393	c->dowarn = PL_dowarn;
394
395	c->curstackinfo = PL_curstackinfo;
396	c->curstack = PL_curstack;
397	c->mainstack = PL_mainstack;
398	c->stack_sp = PL_stack_sp;
399	c->op = PL_op;
400	c->curpad = PL_curpad;
401	c->stack_base = PL_stack_base;
402	c->stack_max = PL_stack_max;
403	c->tmps_stack = PL_tmps_stack;
404	c->tmps_floor = PL_tmps_floor;
405	c->tmps_ix = PL_tmps_ix;
406	c->tmps_max = PL_tmps_max;
407	c->markstack = PL_markstack;
408	c->markstack_ptr = PL_markstack_ptr;
409	c->markstack_max = PL_markstack_max;
410	c->scopestack = PL_scopestack;
411	c->scopestack_ix = PL_scopestack_ix;
412	c->scopestack_max = PL_scopestack_max;
413	c->savestack = PL_savestack;
414	c->savestack_ix = PL_savestack_ix;
415	c->savestack_max = PL_savestack_max;
416	c->retstack = PL_retstack;
417	c->retstack_ix = PL_retstack_ix;
418	c->retstack_max = PL_retstack_max;
419	c->curcop = PL_curcop;
420	c->start_env = PL_start_env;
421	c->top_env = PL_top_env;
422	}	392	}
423		393
424	/*	394	/*
425	* allocate various perl stacks. This is an exact copy	395	* allocate various perl stacks. This is an exact copy
426	* of perl.c:init_stacks, except that it uses less memory	396	* of perl.c:init_stacks, except that it uses less memory
427	* on the assumption that coroutines do not usually need	397	* on the (sometimes correct) assumption that coroutines do
428	* a lot of stackspace.	398	* not usually need a lot of stackspace.
429	*/	399	*/
430	STATIC void	400	static void
431	coro_init_stacks (pTHX)	401	coro_init_stacks ()
432	{	402	{
433	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	403	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
434	PL_curstackinfo->si_type = PERLSI_MAIN;	404	PL_curstackinfo->si_type = PERLSI_MAIN;
435	PL_curstack = PL_curstackinfo->si_stack;	405	PL_curstack = PL_curstackinfo->si_stack;
436	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	406	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
437		407
438	PL_stack_base = AvARRAY(PL_curstack);	408	PL_stack_base = AvARRAY(PL_curstack);
439	PL_stack_sp = PL_stack_base;	409	PL_stack_sp = PL_stack_base;
440	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	410	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
441		411
442	New(50,PL_tmps_stack,64,SV*);	412	New(50,PL_tmps_stack,128,SV*);
443	PL_tmps_floor = -1;	413	PL_tmps_floor = -1;
444	PL_tmps_ix = -1;	414	PL_tmps_ix = -1;
445	PL_tmps_max = 64;	415	PL_tmps_max = 128;
446		416
447	New(54,PL_markstack,12,I32);	417	New(54,PL_markstack,32,I32);
448	PL_markstack_ptr = PL_markstack;	418	PL_markstack_ptr = PL_markstack;
449	PL_markstack_max = PL_markstack + 12;	419	PL_markstack_max = PL_markstack + 32;
450		420
		421	#ifdef SET_MARK_OFFSET
451	SET_MARK_OFFSET;	422	SET_MARK_OFFSET;
		423	#endif
452		424
453	New(54,PL_scopestack,12,I32);	425	New(54,PL_scopestack,32,I32);
454	PL_scopestack_ix = 0;	426	PL_scopestack_ix = 0;
455	PL_scopestack_max = 12;	427	PL_scopestack_max = 32;
456		428
457	New(54,PL_savestack,64,ANY);	429	New(54,PL_savestack,64,ANY);
458	PL_savestack_ix = 0;	430	PL_savestack_ix = 0;
459	PL_savestack_max = 64;	431	PL_savestack_max = 64;
460		432
		433	#if !PERL_VERSION_ATLEAST (5,9,0)
461	New(54,PL_retstack,8,OP*);	434	New(54,PL_retstack,16,OP*);
462	PL_retstack_ix = 0;	435	PL_retstack_ix = 0;
463	PL_retstack_max = 8;	436	PL_retstack_max = 16;
		437	#endif
464	}	438	}
465		439
466	/*	440	/*
467	* destroy the stacks, the callchain etc...	441	* destroy the stacks, the callchain etc...
468	* still there is a memleak of 128 bytes...
469	*/	442	*/
470	STATIC void	443	static void
471	destroy_stacks(pTHX)	444	coro_destroy_stacks ()
472	{	445	{
		446	if (!IN_DESTRUCT)
		447	{
473	/* is this ugly, I ask? */	448	/* is this ugly, I ask? */
474	while (PL_scopestack_ix)	449	LEAVE_SCOPE (0);
475	LEAVE;
476		450
477	/* sure it is, but more important: is it correct?? :/ */	451	/* sure it is, but more important: is it correct?? :/ */
478	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
479	FREETMPS;	452	FREETMPS;
		453
		454	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		455	}
480		456
481	while (PL_curstackinfo->si_next)	457	while (PL_curstackinfo->si_next)
482	PL_curstackinfo = PL_curstackinfo->si_next;	458	PL_curstackinfo = PL_curstackinfo->si_next;
483		459
484	while (PL_curstackinfo)	460	while (PL_curstackinfo)
485	{	461	{
486	PERL_SI *p = PL_curstackinfo->si_prev;	462	PERL_SI *p = PL_curstackinfo->si_prev;
487		463
488	{	464	{ /*D*//*remove*/
489	dSP;	465	dSP;
490	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	466	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
491	PUTBACK; /* possibly superfluous */	467	PUTBACK; /* possibly superfluous */
492	}	468	}
493		469
494	dounwind(-1);	470	if (!IN_DESTRUCT)
495		471	{
		472	dounwind (-1);/*D*//*remove*/
496	SvREFCNT_dec(PL_curstackinfo->si_stack);	473	SvREFCNT_dec (PL_curstackinfo->si_stack);
		474	}
		475
497	Safefree(PL_curstackinfo->si_cxstack);	476	Safefree (PL_curstackinfo->si_cxstack);
498	Safefree(PL_curstackinfo);	477	Safefree (PL_curstackinfo);
499	PL_curstackinfo = p;	478	PL_curstackinfo = p;
500	}	479	}
501		480
502	Safefree(PL_tmps_stack);	481	Safefree (PL_tmps_stack);
503	Safefree(PL_markstack);	482	Safefree (PL_markstack);
504	Safefree(PL_scopestack);	483	Safefree (PL_scopestack);
505	Safefree(PL_savestack);	484	Safefree (PL_savestack);
		485	#if !PERL_VERSION_ATLEAST (5,9,0)
506	Safefree(PL_retstack);	486	Safefree (PL_retstack);
507	}
508
509	static void
510	allocate_stack (Coro__State ctx)
511	{
512	#ifdef HAVE_MMAP
513	ctx->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
514	ctx->sptr = mmap (0, ctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
515	if (ctx->sptr == (void *)-1)
516	#endif	487	#endif
517	{
518	/*FIXME*//*D*//* reasonable stack size! */
519	ctx->ssize = 4096 * sizeof (long);
520	New (0, ctx->sptr, 4096, long);
521	}
522	}	488	}
523		489
524	static void	490	static void
525	deallocate_stack (Coro__State ctx)	491	setup_coro (struct coro *coro)
526	{
527	#ifdef HAVE_MMAP
528	munmap (ctx->sptr, ctx->ssize);
529	#else
530	Safefree (ctx->sptr);
531	#endif
532	}
533
534	/* might go away together with optional SAVE_CCTXT */
535	static void
536	setup_coro (void *arg)
537	{	492	{
538	/*	493	/*
539	* emulate part of the perl startup here.	494	* emulate part of the perl startup here.
540	*/	495	*/
		496
		497	coro_init_stacks ();
		498
		499	PL_curcop = &PL_compiling;
		500	PL_in_eval = EVAL_NULL;
		501	PL_curpm = 0;
		502	PL_localizing = 0;
		503	PL_dirty = 0;
		504	PL_restartop = 0;
		505
		506	{
		507	dSP;
		508	LOGOP myop;
		509
		510	SvREFCNT_dec (GvAV (PL_defgv));
		511	GvAV (PL_defgv) = coro->args; coro->args = 0;
		512
		513	Zero (&myop, 1, LOGOP);
		514	myop.op_next = Nullop;
		515	myop.op_flags = OPf_WANT_VOID;
		516
		517	PUSHMARK (SP);
		518	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		519	PUTBACK;
		520	PL_op = (OP *)&myop;
		521	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		522	SPAGAIN;
		523	}
		524
		525	ENTER; /* necessary e.g. for dounwind */
		526	}
		527
		528	static void
		529	free_coro_mortal ()
		530	{
		531	if (coro_mortal)
		532	{
		533	SvREFCNT_dec (coro_mortal);
		534	coro_mortal = 0;
		535	}
		536	}
		537
		538	/* inject a fake call to Coro::State::_cctx_init into the execution */
		539	static void NOINLINE
		540	prepare_cctx (coro_cctx *cctx)
		541	{
541	dSP;	542	dSP;
542	Coro__State ctx = (Coro__State)arg;	543	LOGOP myop;
543	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
544		544
545	coro_init_stacks (aTHX);	545	Zero (&myop, 1, LOGOP);
546	JMPENV_BOOTSTRAP;	546	myop.op_next = PL_op;
		547	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		548
		549	PUSHMARK (SP);
		550	EXTEND (SP, 2);
		551	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		552	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		553	PUTBACK;
		554	PL_op = (OP *)&myop;
		555	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
547	SPAGAIN;	556	SPAGAIN;
		557	}
548		558
549	/*PL_curcop = 0;*/	559	static void
550	SvREFCNT_dec (GvAV (PL_defgv));	560	coro_run (void *arg)
551	GvAV (PL_defgv) = ctx->args;	561	{
		562	/* coro_run is the alternative tail of transfer(), so unlock here. */
		563	UNLOCK;
552		564
553	if (ctx->sptr)	565	/*
		566	* this is a _very_ stripped down perl interpreter ;)
		567	*/
		568	PL_top_env = &PL_start_env;
		569
		570	/* inject call to cctx_init */
		571	prepare_cctx ((coro_cctx *)arg);
		572
		573	/* somebody will hit me for both perl_run and PL_restartop */
		574	PL_restartop = PL_op;
		575	perl_run (PL_curinterp);
		576
		577	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		578	abort ();
		579	}
		580
		581	static coro_cctx *
		582	cctx_new ()
		583	{
		584	coro_cctx *cctx;
		585
		586	++cctx_count;
		587
		588	New (0, cctx, 1, coro_cctx);
		589
		590	#if HAVE_MMAP
		591
		592	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		593	/* mmap supposedly does allocate-on-write for us */
		594	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		595
		596	if (cctx->sptr == (void *)-1)
554	{	597	{
555	PUSHMARK(SP);	598	perror ("FATAL: unable to mmap stack for coroutine");
556	PUTBACK;	599	_exit (EXIT_FAILURE);
557	(void) call_sv (sub_init, G_VOID|G_NOARGS);	600	}
558	croak ("FATAL: CCTXT coroutine returned!");	601
		602	# if STACKGUARD
		603	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		604	# endif
		605
		606	#else
		607
		608	cctx->ssize = STACKSIZE * (long)sizeof (long);
		609	New (0, cctx->sptr, STACKSIZE, long);
		610
		611	if (!cctx->sptr)
		612	{
		613	perror ("FATAL: unable to malloc stack for coroutine");
		614	_exit (EXIT_FAILURE);
		615	}
		616
		617	#endif
		618
		619	#if USE_VALGRIND
		620	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		621	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		622	cctx->ssize + (char *)cctx->sptr
		623	);
		624	#endif
		625
		626	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		627
		628	return cctx;
		629	}
		630
		631	static void
		632	cctx_destroy (coro_cctx *cctx)
		633	{
		634	if (!cctx)
		635	return;
		636
		637	--cctx_count;
		638
		639	#if USE_VALGRIND
		640	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		641	#endif
		642
		643	#if HAVE_MMAP
		644	munmap (cctx->sptr, cctx->ssize);
		645	#else
		646	Safefree (cctx->sptr);
		647	#endif
		648
		649	Safefree (cctx);
		650	}
		651
		652	static coro_cctx *
		653	cctx_get ()
		654	{
		655	coro_cctx *cctx;
		656
		657	if (cctx_first)
		658	{
		659	cctx = cctx_first;
		660	cctx_first = cctx->next;
		661	--cctx_idle;
559	}	662	}
560	else	663	else
		664	{
		665	cctx = cctx_new ();
		666	PL_op = PL_op->op_next;
		667	}
		668
		669	return cctx;
		670	}
		671
		672	static void
		673	cctx_put (coro_cctx *cctx)
		674	{
		675	/* free another cctx if overlimit */
		676	if (cctx_idle >= MAX_IDLE_CCTX)
561	{	677	{
562	UNOP myop;	678	coro_cctx *first = cctx_first;
		679	cctx_first = first->next;
		680	--cctx_idle;
563		681
564	PL_op = (OP *)&myop;	682	assert (!first->inuse);
565		683	cctx_destroy (first);
566	Zero(&myop, 1, UNOP);
567	myop.op_next = Nullop;
568	myop.op_flags = OPf_WANT_VOID;
569
570	PUSHMARK(SP);
571	XPUSHs (sub_init);
572	/*
573	* the next line is slightly wrong, as PL_op->op_next
574	* is actually being executed so we skip the first op.
575	* that doesn't matter, though, since it is only
576	* pp_nextstate and we never return...
577	* ah yes, and I don't care anyways ;)
578	*/
579	PUTBACK;
580	PL_op = pp_entersub();
581	SPAGAIN;
582
583	ENTER; /* necessary e.g. for dounwind */
584	}	684	}
585	}
586		685
587	STATIC void	686	++cctx_idle;
		687	cctx->next = cctx_first;
		688	cctx_first = cctx;
		689	}
		690
		691	/* never call directly, always through the coro_state_transfer global variable */
		692	static void NOINLINE
588	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	693	transfer (struct coro *prev, struct coro *next, int flags)
589	{	694	{
590	dSP;	695	dSTACKLEVEL;
591		696
		697	/* sometimes transfer is only called to set idle_sp */
		698	if (flags == TRANSFER_SET_STACKLEVEL)
		699	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
592	if (prev != next)	700	else if (prev != next)
593	{	701	{
594	/*	702	coro_cctx *prev__cctx;
595	* this could be done in newprocess which would lead to	703
596	* extremely elegant and fast (basically just SAVE/LOAD)	704	if (prev->flags & CF_NEW)
597	* code here, but lazy allocation of stacks has also
598	* some virtues and the overhead of the if() is nil.
599	*/
600	if (next->mainstack)
601	{	705	{
		706	/* create a new empty context */
		707	Newz (0, prev->cctx, 1, coro_cctx);
		708	prev->cctx->inuse = 1;
		709	prev->flags &= ~CF_NEW;
		710	prev->flags |= CF_RUNNING;
		711	}
		712
		713	/*TODO: must not croak here */
		714	if (!prev->flags & CF_RUNNING)
		715	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		716
		717	if (next->flags & CF_RUNNING)
		718	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		719
		720	prev->flags &= ~CF_RUNNING;
		721	next->flags |= CF_RUNNING;
		722
		723	LOCK;
		724
		725	if (next->flags & CF_NEW)
		726	{
		727	/* need to start coroutine */
		728	next->flags &= ~CF_NEW;
		729	/* first get rid of the old state */
		730	SAVE (prev, -1);
		731	/* setup coroutine call */
		732	setup_coro (next);
		733	/* need a new stack */
		734	assert (!next->stack);
		735	}
		736	else
		737	{
		738	/* coroutine already started */
602	SAVE (prev, flags);	739	SAVE (prev, flags);
603	LOAD (next);	740	LOAD (next);
604
605	/* mark this state as in-use */
606	next->mainstack = 0;
607	next->tmps_ix = -2;
608
609	if (flags & TRANSFER_SAVE_CCTXT)
610	{
611	if (!next->ssize)
612	croak ("destination coroutine has no CCTXT (%p, %d)", next->sptr, next->ssize);
613
614	if (!prev->ssize)
615	prev->ssize = 1; /* mark cctx as valid ;) */
616
617	coro_transfer (&(prev->cctx), &(next->cctx));
618	}
619
620	}	741	}
621	else if (next->tmps_ix == -2)	742
622	croak ("tried to transfer to running coroutine");	743	prev__cctx = prev->cctx;
623	else	744
		745	/* possibly "free" the cctx */
		746	if (prev__cctx->idle_sp == STACKLEVEL)
624	{	747	{
625	SAVE (prev, -1); /* first get rid of the old state */	748	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		749	assert (PL_top_env == prev__cctx->top_env);
626		750
627	if (flags & TRANSFER_SAVE_CCTXT)	751	prev->cctx = 0;
628	{
629	if (!next->ssize)
630	{
631	allocate_stack (next);
632	coro_create (&(next->cctx),
633	setup_coro, (void *)next,
634	next->sptr, next->ssize);
635	}
636		752
637	if (!prev->ssize)	753	cctx_put (prev__cctx);
638	prev->ssize = 1; /* mark cctx as valid ;) */	754	prev__cctx->inuse = 0;
639
640	coro_transfer (&(prev->cctx), &(next->cctx));
641	}
642	else
643	setup_coro (next);
644	}	755	}
		756
		757	if (!next->cctx)
		758	{
		759	next->cctx = cctx_get ();
		760	assert (!next->cctx->inuse);
		761	next->cctx->inuse = 1;
		762	}
		763
		764	if (prev__cctx != next->cctx)
		765	{
		766	prev__cctx->top_env = PL_top_env;
		767	PL_top_env = next->cctx->top_env;
		768	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		769	}
		770
		771	free_coro_mortal ();
		772
		773	UNLOCK;
645	}	774	}
646	}	775	}
647		776
		777	struct transfer_args
		778	{
		779	struct coro *prev, *next;
		780	int flags;
		781	};
		782
		783	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		784
		785	static void
		786	coro_state_destroy (struct coro *coro)
		787	{
		788	if (coro->refcnt--)
		789	return;
		790
		791	if (coro->mainstack && coro->mainstack != main_mainstack)
		792	{
		793	struct coro temp;
		794
		795	if (coro->flags & CF_RUNNING)
		796	croak ("FATAL: tried to destroy currently running coroutine");
		797
		798	SAVE ((&temp), TRANSFER_SAVE_ALL);
		799	LOAD (coro);
		800
		801	coro_destroy_stacks ();
		802
		803	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		804
		805	coro->mainstack = 0;
		806	}
		807
		808	cctx_destroy (coro->cctx);
		809	SvREFCNT_dec (coro->args);
		810	Safefree (coro);
		811	}
		812
		813	static int
		814	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		815	{
		816	struct coro *coro = (struct coro *)mg->mg_ptr;
		817	mg->mg_ptr = 0;
		818
		819	coro_state_destroy (coro);
		820
		821	return 0;
		822	}
		823
		824	static int
		825	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		826	{
		827	struct coro *coro = (struct coro *)mg->mg_ptr;
		828
		829	++coro->refcnt;
		830
		831	return 0;
		832	}
		833
		834	static MGVTBL coro_state_vtbl = {
		835	0, 0, 0, 0,
		836	coro_state_clear,
		837	0,
		838	#ifdef MGf_DUP
		839	coro_state_dup,
		840	#else
		841	# define MGf_DUP 0
		842	#endif
		843	};
		844
		845	static struct coro *
		846	SvSTATE (SV *coro)
		847	{
		848	HV *stash;
		849	MAGIC *mg;
		850
		851	if (SvROK (coro))
		852	coro = SvRV (coro);
		853
		854	stash = SvSTASH (coro);
		855	if (stash != coro_stash && stash != coro_state_stash)
		856	{
		857	/* very slow, but rare, check */
		858	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		859	croak ("Coro::State object required");
		860	}
		861
		862	mg = SvMAGIC (coro);
		863	assert (mg->mg_type == PERL_MAGIC_ext);
		864	return (struct coro *)mg->mg_ptr;
		865	}
		866
		867	static void
		868	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		869	{
		870	ta->prev = SvSTATE (prev);
		871	ta->next = SvSTATE (next);
		872	ta->flags = flags;
		873	}
		874
		875	static void
		876	api_transfer (SV *prev, SV *next, int flags)
		877	{
		878	struct transfer_args ta;
		879
		880	prepare_transfer (&ta, prev, next, flags);
		881	TRANSFER (ta);
		882	}
		883
		884	/** Coro ********************************************************************/
		885
		886	#define PRIO_MAX 3
		887	#define PRIO_HIGH 1
		888	#define PRIO_NORMAL 0
		889	#define PRIO_LOW -1
		890	#define PRIO_IDLE -3
		891	#define PRIO_MIN -4
		892
		893	/* for Coro.pm */
		894	static SV *coro_current;
		895	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		896	static int coro_nready;
		897
		898	static void
		899	coro_enq (SV *coro_sv)
		900	{
		901	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		902	coro_nready++;
		903	}
		904
		905	static SV *
		906	coro_deq (int min_prio)
		907	{
		908	int prio = PRIO_MAX - PRIO_MIN;
		909
		910	min_prio -= PRIO_MIN;
		911	if (min_prio < 0)
		912	min_prio = 0;
		913
		914	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		915	if (AvFILLp (coro_ready [prio]) >= 0)
		916	{
		917	coro_nready--;
		918	return av_shift (coro_ready [prio]);
		919	}
		920
		921	return 0;
		922	}
		923
		924	static int
		925	api_ready (SV *coro_sv)
		926	{
		927	struct coro *coro;
		928
		929	if (SvROK (coro_sv))
		930	coro_sv = SvRV (coro_sv);
		931
		932	coro = SvSTATE (coro_sv);
		933
		934	if (coro->flags & CF_READY)
		935	return 0;
		936
		937	#if 0 /* this is actually harmless */
		938	if (coro->flags & CF_RUNNING)
		939	croak ("Coro::ready called on currently running coroutine");
		940	#endif
		941
		942	coro->flags |= CF_READY;
		943
		944	LOCK;
		945	coro_enq (SvREFCNT_inc (coro_sv));
		946	UNLOCK;
		947
		948	return 1;
		949	}
		950
		951	static int
		952	api_is_ready (SV *coro_sv)
		953	{
		954	return !!SvSTATE (coro_sv)->flags & CF_READY;
		955	}
		956
		957	static void
		958	prepare_schedule (struct transfer_args *ta)
		959	{
		960	SV *prev, *next;
		961
		962	for (;;)
		963	{
		964	LOCK;
		965	next = coro_deq (PRIO_MIN);
		966	UNLOCK;
		967
		968	if (next)
		969	break;
		970
		971	{
		972	dSP;
		973
		974	ENTER;
		975	SAVETMPS;
		976
		977	PUSHMARK (SP);
		978	PUTBACK;
		979	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		980
		981	FREETMPS;
		982	LEAVE;
		983	}
		984	}
		985
		986	prev = SvRV (coro_current);
		987	SvRV_set (coro_current, next);
		988
		989	/* free this only after the transfer */
		990	LOCK;
		991	free_coro_mortal ();
		992	UNLOCK;
		993	coro_mortal = prev;
		994
		995	assert (!SvROK(prev));//D
		996	assert (!SvROK(next));//D
		997
		998	ta->prev = SvSTATE (prev);
		999	ta->next = SvSTATE (next);
		1000	ta->flags = TRANSFER_SAVE_ALL;
		1001
		1002	assert (ta->flags & CF_READY);
		1003	ta->next->flags &= ~CF_READY;
		1004	}
		1005
		1006	static void
		1007	prepare_cede (struct transfer_args *ta)
		1008	{
		1009	api_ready (coro_current);
		1010
		1011	prepare_schedule (ta);
		1012	}
		1013
		1014	static void
		1015	api_schedule (void)
		1016	{
		1017	struct transfer_args ta;
		1018
		1019	prepare_schedule (&ta);
		1020	TRANSFER (ta);
		1021	}
		1022
		1023	static void
		1024	api_cede (void)
		1025	{
		1026	struct transfer_args ta;
		1027
		1028	prepare_cede (&ta);
		1029	TRANSFER (ta);
		1030	}
		1031
648	MODULE = Coro::State PACKAGE = Coro::State	1032	MODULE = Coro::State PACKAGE = Coro::State
649		1033
650	PROTOTYPES: ENABLE	1034	PROTOTYPES: DISABLE
651		1035
652	BOOT:	1036	BOOT:
653	{ /* {} necessary for stoopid perl-5.6.x */	1037	{
654	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1038	#ifdef USE_ITHREADS
655	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1039	MUTEX_INIT (&coro_mutex);
		1040	#endif
		1041	BOOT_PAGESIZE;
		1042
656	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1043	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
657		1044
658	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1045	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
659	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1046	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
660	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1047	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
661	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
662
663	if (!padlist_cache)
664	padlist_cache = newHV ();
665		1048
666	main_mainstack = PL_mainstack;	1049	main_mainstack = PL_mainstack;
667	}
668		1050
669	Coro::State	1051	coroapi.ver = CORO_API_VERSION;
670	_newprocess(args)	1052	coroapi.transfer = api_transfer;
671	SV * args	1053
672	PROTOTYPE: $	1054	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1055	}
		1056
		1057	SV *
		1058	new (char *klass, ...)
673	CODE:	1059	CODE:
674	Coro__State coro;	1060	{
		1061	struct coro *coro;
		1062	HV *hv;
		1063	int i;
675		1064
676	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
677	croak ("Coro::State::_newprocess expects an arrayref");
678
679	New (0, coro, 1, struct coro);	1065	Newz (0, coro, 1, struct coro);
		1066	coro->args = newAV ();
		1067	coro->flags = CF_NEW;
680		1068
681	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1069	hv = newHV ();
682	coro->mainstack = 0; /* actual work is done inside transfer */	1070	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
683	coro->sptr = 0;	1071	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
684	coro->ssize = 0;
685		1072
686	RETVAL = coro;	1073	for (i = 1; i < items; i++)
		1074	av_push (coro->args, newSVsv (ST (i)));
		1075	}
687	OUTPUT:	1076	OUTPUT:
688	RETVAL	1077	RETVAL
689		1078
690	void	1079	void
691	transfer(prev, next, flags = TRANSFER_SAVE_ALL)	1080	_set_stacklevel (...)
692	Coro::State_or_hashref prev	1081	ALIAS:
693	Coro::State_or_hashref next	1082	Coro::State::transfer = 1
694	int flags	1083	Coro::schedule = 2
695	PROTOTYPE: @	1084	Coro::cede = 3
696	CODE:	1085	CODE:
697	transfer (aTHX_ prev, next, flags);	1086	{
		1087	struct transfer_args ta;
		1088
		1089	switch (ix)
		1090	{
		1091	case 0:
		1092	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1093	ta.next = 0;
		1094	ta.flags = TRANSFER_SET_STACKLEVEL;
		1095	break;
		1096
		1097	case 1:
		1098	if (items != 3)
		1099	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1100
		1101	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1102	break;
		1103
		1104	case 2:
		1105	prepare_schedule (&ta);
		1106	break;
		1107
		1108	case 3:
		1109	prepare_cede (&ta);
		1110	break;
		1111	}
		1112
		1113	TRANSFER (ta);
		1114	}
698		1115
699	void	1116	void
700	DESTROY(coro)	1117	_clone_state_from (SV *dst, SV *src)
701	Coro::State coro	1118	CODE:
		1119	{
		1120	struct coro *coro_src = SvSTATE (src);
		1121
		1122	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1123
		1124	++coro_src->refcnt;
		1125	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1126	}
		1127
		1128	void
		1129	_exit (code)
		1130	int code
		1131	PROTOTYPE: $
		1132	CODE:
		1133	_exit (code);
		1134
		1135	int
		1136	cctx_count ()
		1137	CODE:
		1138	RETVAL = cctx_count;
		1139	OUTPUT:
		1140	RETVAL
		1141
		1142	int
		1143	cctx_idle ()
		1144	CODE:
		1145	RETVAL = cctx_idle;
		1146	OUTPUT:
		1147	RETVAL
		1148
		1149	MODULE = Coro::State PACKAGE = Coro
		1150
		1151	BOOT:
		1152	{
		1153	int i;
		1154
		1155	coro_stash = gv_stashpv ("Coro", TRUE);
		1156
		1157	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1158	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1159	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1160	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1161	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1162	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1163
		1164	coro_current = get_sv ("Coro::current", FALSE);
		1165	SvREADONLY_on (coro_current);
		1166
		1167	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1168	coro_ready[i] = newAV ();
		1169
		1170	{
		1171	SV *sv = perl_get_sv("Coro::API", 1);
		1172
		1173	coroapi.schedule = api_schedule;
		1174	coroapi.cede = api_cede;
		1175	coroapi.ready = api_ready;
		1176	coroapi.is_ready = api_is_ready;
		1177	coroapi.nready = &coro_nready;
		1178	coroapi.current = coro_current;
		1179
		1180	GCoroAPI = &coroapi;
		1181	sv_setiv (sv, (IV)&coroapi);
		1182	SvREADONLY_on (sv);
		1183	}
		1184	}
		1185
		1186	int
		1187	prio (Coro::State coro, int newprio = 0)
		1188	ALIAS:
		1189	nice = 1
702	CODE:	1190	CODE:
		1191	{
		1192	RETVAL = coro->prio;
703		1193
704	if (coro->mainstack && coro->mainstack != main_mainstack)	1194	if (items > 1)
705	{	1195	{
706	struct coro temp;	1196	if (ix)
		1197	newprio += coro->prio;
707		1198
708	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1199	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
709	LOAD(aTHX_ coro);	1200	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
710		1201
711	destroy_stacks (aTHX);	1202	coro->prio = newprio;
712
713	LOAD((&temp)); /* this will get rid of defsv etc.. */
714
715	coro->mainstack = 0;
716	}	1203	}
		1204	}
717		1205
718	if (coro->sptr)	1206	SV *
719	{	1207	ready (SV *self)
720	deallocate_stack (coro);	1208	PROTOTYPE: $
721	coro->sptr = 0;	1209	CODE:
722	}	1210	RETVAL = boolSV (api_ready (self));
		1211	OUTPUT:
		1212	RETVAL
723		1213
724	Safefree (coro);	1214	SV *
		1215	is_ready (SV *self)
		1216	PROTOTYPE: $
		1217	CODE:
		1218	RETVAL = boolSV (api_is_ready (self));
		1219	OUTPUT:
		1220	RETVAL
		1221
		1222	int
		1223	nready (...)
		1224	PROTOTYPE:
		1225	CODE:
		1226	RETVAL = coro_nready;
		1227	OUTPUT:
		1228	RETVAL
725		1229
726	void	1230	void
727	flush()	1231	_set_current (SV *current)
		1232	PROTOTYPE: $
728	CODE:	1233	CODE:
729	#ifdef MAY_FLUSH	1234	SvREFCNT_dec (SvRV (coro_current));
730	flush_padlist_cache ();	1235	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
731	#endif
732		1236
733	MODULE = Coro::State PACKAGE = Coro::Cont	1237	MODULE = Coro::State PACKAGE = Coro::AIO
734		1238
735	# this is slightly dirty	1239	SV *
		1240	_get_state ()
		1241	CODE:
		1242	{
		1243	struct io_state *data;
		1244
		1245	RETVAL = newSV (sizeof (struct io_state));
		1246	data = (struct io_state *)SvPVX (RETVAL);
		1247	SvCUR_set (RETVAL, sizeof (struct io_state));
		1248	SvPOK_only (RETVAL);
		1249
		1250	data->errorno = errno;
		1251	data->laststype = PL_laststype;
		1252	data->laststatval = PL_laststatval;
		1253	data->statcache = PL_statcache;
		1254	}
		1255	OUTPUT:
		1256	RETVAL
736		1257
737	void	1258	void
738	yield(...)	1259	_set_state (char *data_)
739	PROTOTYPE: @	1260	PROTOTYPE: $
740	CODE:	1261	CODE:
741	static SV *returnstk;	1262	{
742	SV *sv;	1263	struct io_state *data = (void *)data_;
743	AV *defav = GvAV (PL_defgv);
744	struct coro *prev, *next;
745		1264
746	if (!returnstk)	1265	errno = data->errorno;
747	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1266	PL_laststype = data->laststype;
		1267	PL_laststatval = data->laststatval;
		1268	PL_statcache = data->statcache;
		1269	}
748		1270
749	/* set up @_ -- ugly */
750	av_clear (defav);
751	av_fill (defav, items - 1);
752	while (items--)
753	av_store (defav, items, SvREFCNT_inc (ST(items)));
754
755	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
756	sv = av_pop ((AV *)SvRV (returnstk));
757	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
758	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
759	SvREFCNT_dec (sv);
760
761	transfer(aTHX_ prev, next, 0);
762

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