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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.30 by root, Sat Aug 25 22:19:05 2001 UTC vs.
Revision 1.116 by root, Fri Dec 1 14:01:43 2006 UTC

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

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