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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.33 by root, Sun Aug 26 21:44:20 2001 UTC vs.
Revision 1.117 by root, Fri Dec 1 19:41:06 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 = 0x0001, /* coroutine is running */
		136	CF_READY = 0x0002, /* coroutine is ready */
		137	CF_NEW = 0x0004, /* ahs never been switched to */
		138	};
		139
		140	/* this is a structure representing a perl-level coroutine */
49	struct coro {	141	struct coro {
50	/* the optional C context */	142	/* the c coroutine allocated to this perl coroutine, if any */
51	coro_stack *stack;	143	coro_cctx *cctx;
52	void *cursp;	144
		145	/* data associated with this coroutine (initial args) */
		146	AV *args;
53	int gencnt;	147	int refcnt;
		148	int flags;
54		149
55	/* optionally saved, might be zero */	150	/* optionally saved, might be zero */
56	AV *defav;	151	AV *defav;
57	SV *defsv;	152	SV *defsv;
58	SV *errsv;	153	SV *errsv;
59		154
60	/* saved global state not related to stacks */	155	#define VAR(name,type) type name;
61	U8 dowarn;	156	# include "state.h"
62	I32 in_eval;	157	#undef VAR
63		158
64	/* the stacks and related info (callchain etc..) */	159	/* coro process data */
65	PERL_SI *curstackinfo;	160	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	};	161	};
95		162
96	typedef struct coro *Coro__State;	163	typedef struct coro *Coro__State;
97	typedef struct coro *Coro__State_or_hashref;	164	typedef struct coro *Coro__State_or_hashref;
98		165
99	static AV *main_mainstack; /* used to differentiate between $main and others */	166	static AV *
100	static HV *coro_state_stash;	167	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	{	168	{
109	AV *av;	169	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;	170	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		171
128	newpadlist = newAV ();	172	newpadlist = newAV ();
129	AvREAL_off (newpadlist);	173	AvREAL_off (newpadlist);
130	av_store (newpadlist, 0, (SV *) newpad_name);	174	#if PERL_VERSION_ATLEAST (5,9,0)
		175	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		176	#else
		177	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		178	#endif
		179	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		180	--AvFILLp (padlist);
		181
		182	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
131	av_store (newpadlist, 1, (SV *) newpad);	183	av_store (newpadlist, 1, (SV *)newpad);
132		184
133	av = newAV (); /* will be @_ */	185	return newpadlist;
134	av_extend (av, 0);	186	}
135	av_store (newpad, 0, (SV *) av);
136	AvFLAGS (av) = AVf_REIFY;
137		187
138	for (ix = fpad; ix > 0; ix--)	188	static void
		189	free_padlist (AV *padlist)
		190	{
		191	/* may be during global destruction */
		192	if (SvREFCNT (padlist))
139	{	193	{
140	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	194	I32 i = AvFILLp (padlist);
141	if (namesv && namesv != &PL_sv_undef)	195	while (i >= 0)
142	{	196	{
143	char *name = SvPVX (namesv); /* XXX */	197	SV **svp = av_fetch (padlist, i--, FALSE);
144	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	198	if (svp)
145	{ /* lexical from outside? */
146	npad[ix] = SvREFCNT_inc (ppad[ix]);
147	}	199	{
148	else
149	{ /* our own lexical */
150	SV *sv;	200	SV *sv;
151	if (*name == '&')	201	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
152	sv = SvREFCNT_inc (ppad[ix]);	202	SvREFCNT_dec (sv);
153	else if (*name == '@')	203
154	sv = (SV *) newAV ();	204	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	}	205	}
163	}	206	}
164	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	207
165	{	208	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	}	209	}
		210	}
175		211
176	#if 0 /* return -ENOTUNDERSTOOD */	212	static int
177	/* Now that vars are all in place, clone nested closures. */	213	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		214	{
		215	AV *padlist;
		216	AV *av = (AV *)mg->mg_obj;
178		217
179	for (ix = fpad; ix > 0; ix--) {	218	/* casting is fun. */
180	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	219	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
181	if (namesv	220	free_padlist (padlist);
182	&& namesv != &PL_sv_undef	221
183	&& !(SvFLAGS(namesv) & SVf_FAKE)	222	SvREFCNT_dec (av);
184	&& *SvPVX(namesv) == '&'	223
185	&& CvCLONE(ppad[ix]))	224	return 0;
186	{	225	}
187	CV *kid = cv_clone((CV*)ppad[ix]);	226
188	SvREFCNT_dec(ppad[ix]);	227	#define PERL_MAGIC_coro PERL_MAGIC_ext
189	CvCLONE_on(kid);	228
190	SvPADMY_on(kid);	229	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
191	npad[ix] = (SV*)kid;	230
192	}	231	#define CORO_MAGIC(cv) \
		232	SvMAGIC (cv) \
		233	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		234	? SvMAGIC (cv) \
		235	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		236	: 0
		237
		238	/* the next two functions merely cache the padlists */
		239	static void
		240	get_padlist (CV *cv)
		241	{
		242	MAGIC *mg = CORO_MAGIC (cv);
		243	AV *av;
		244
		245	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		246	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		247	else
		248	{
		249	#if 0
		250	/* this is probably cleaner, but also slower? */
		251	CV *cp = Perl_cv_clone (cv);
		252	CvPADLIST (cv) = CvPADLIST (cp);
		253	CvPADLIST (cp) = 0;
		254	SvREFCNT_dec (cp);
		255	#else
		256	CvPADLIST (cv) = coro_clone_padlist (cv);
		257	#endif
		258	}
		259	}
		260
		261	static void
		262	put_padlist (CV *cv)
		263	{
		264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
		266
		267	if (!mg)
		268	{
		269	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		270	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		271	mg->mg_virtual = &vtbl_coro;
		272	mg->mg_obj = (SV *)newAV ();
193	}	273	}
194	#endif
195		274
196	return newpadlist;	275	av = (AV *)mg->mg_obj;
197	}
198		276
199	#ifdef MAY_FLUSH	277	if (AvFILLp (av) >= AvMAX (av))
200	STATIC void	278	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		279
215	SvREFCNT_dec((SV*)padlist);	280	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
216	}
217	}	281	}
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		282
272	#define SB do {	283	#define SB do {
273	#define SE } while (0)	284	#define SE } while (0)
274		285
275	#define LOAD(state) load_state(aTHX_ (state));	286	#define LOAD(state) load_state ((state))
276	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	287	#define SAVE(state,flags) save_state ((state),(flags))
277		288
278	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
279		290
280	static void	291	static void
281	load_state(pTHX_ Coro__State c)	292	load_state (Coro__State c)
282	{	293	{
283	PL_dowarn = c->dowarn;	294	#define VAR(name,type) PL_ ## name = c->name;
284	PL_in_eval = c->in_eval;	295	# include "state.h"
285		296	#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		297
313	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	298	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
314	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	299	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
315	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	300	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
316		301
…		…
319	CV *cv;	304	CV *cv;
320		305
321	/* now do the ugly restore mess */	306	/* now do the ugly restore mess */
322	while ((cv = (CV *)POPs))	307	while ((cv = (CV *)POPs))
323	{	308	{
324	AV *padlist = (AV *)POPs;
325
326	if (padlist)
327	{
328	put_padlist (cv); /* mark this padlist as available */	309	put_padlist (cv); /* mark this padlist as available */
329	CvPADLIST(cv) = padlist;	310	CvDEPTH (cv) = PTR2IV (POPs);
330	#ifdef USE_THREADS	311	CvPADLIST (cv) = (AV *)POPs;
331	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
332	#endif
333	}
334
335	++CvDEPTH(cv);
336	}	312	}
337		313
338	PUTBACK;	314	PUTBACK;
339	}	315	}
340	}	316	}
341		317
342	static void	318	static void
343	save_state(pTHX_ Coro__State c, int flags)	319	save_state (Coro__State c, int flags)
344	{	320	{
345	{	321	{
346	dSP;	322	dSP;
347	I32 cxix = cxstack_ix;	323	I32 cxix = cxstack_ix;
348	PERL_CONTEXT *ccstk = cxstack;	324	PERL_CONTEXT *ccstk = cxstack;
…		…
359	{	335	{
360	while (cxix >= 0)	336	while (cxix >= 0)
361	{	337	{
362	PERL_CONTEXT *cx = &ccstk[cxix--];	338	PERL_CONTEXT *cx = &ccstk[cxix--];
363		339
364	if (CxTYPE(cx) == CXt_SUB)	340	if (CxTYPE (cx) == CXt_SUB)
365	{	341	{
366	CV *cv = cx->blk_sub.cv;	342	CV *cv = cx->blk_sub.cv;
		343
367	if (CvDEPTH(cv))	344	if (CvDEPTH (cv))
368	{	345	{
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);	346	EXTEND (SP, 3);
375		347
376	while (--CvDEPTH(cv))
377	{
378	/* this tells the restore code to increment CvDEPTH */
379	PUSHs (Nullsv);
380	PUSHs ((SV *)cv);
381	}
382
383	PUSHs ((SV *)CvPADLIST(cv));	348	PUSHs ((SV *)CvPADLIST (cv));
		349	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
384	PUSHs ((SV *)cv);	350	PUSHs ((SV *)cv);
385		351
		352	CvDEPTH (cv) = 0;
386	get_padlist (cv); /* this is a monster */	353	get_padlist (cv);
387	}	354	}
388	}	355	}
		356	#ifdef CXt_FORMAT
389	else if (CxTYPE(cx) == CXt_FORMAT)	357	else if (CxTYPE (cx) == CXt_FORMAT)
390	{	358	{
391	/* I never used formats, so how should I know how these are implemented? */	359	/* I never used formats, so how should I know how these are implemented? */
392	/* my bold guess is as a simple, plain sub... */	360	/* my bold guess is as a simple, plain sub... */
393	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	361	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
394	}	362	}
		363	#endif
395	}	364	}
396		365
397	if (top_si->si_type == PERLSI_MAIN)	366	if (top_si->si_type == PERLSI_MAIN)
398	break;	367	break;
399		368
…		…
407		376
408	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	377	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
409	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	378	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
410	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	379	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
411		380
412	c->dowarn = PL_dowarn;	381	#define VAR(name,type)c->name = PL_ ## name;
413	c->in_eval = PL_in_eval;	382	# include "state.h"
414		383	#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	}	384	}
442		385
443	/*	386	/*
444	* allocate various perl stacks. This is an exact copy	387	* allocate various perl stacks. This is an exact copy
445	* of perl.c:init_stacks, except that it uses less memory	388	* of perl.c:init_stacks, except that it uses less memory
446	* on the assumption that coroutines do not usually need	389	* on the (sometimes correct) assumption that coroutines do
447	* a lot of stackspace.	390	* not usually need a lot of stackspace.
448	*/	391	*/
449	STATIC void	392	static void
450	coro_init_stacks (pTHX)	393	coro_init_stacks ()
451	{	394	{
452	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	395	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
453	PL_curstackinfo->si_type = PERLSI_MAIN;	396	PL_curstackinfo->si_type = PERLSI_MAIN;
454	PL_curstack = PL_curstackinfo->si_stack;	397	PL_curstack = PL_curstackinfo->si_stack;
455	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	398	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
456		399
457	PL_stack_base = AvARRAY(PL_curstack);	400	PL_stack_base = AvARRAY(PL_curstack);
458	PL_stack_sp = PL_stack_base;	401	PL_stack_sp = PL_stack_base;
459	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	402	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
460		403
461	New(50,PL_tmps_stack,96,SV*);	404	New(50,PL_tmps_stack,128,SV*);
462	PL_tmps_floor = -1;	405	PL_tmps_floor = -1;
463	PL_tmps_ix = -1;	406	PL_tmps_ix = -1;
464	PL_tmps_max = 96;	407	PL_tmps_max = 128;
465		408
466	New(54,PL_markstack,16,I32);	409	New(54,PL_markstack,32,I32);
467	PL_markstack_ptr = PL_markstack;	410	PL_markstack_ptr = PL_markstack;
468	PL_markstack_max = PL_markstack + 16;	411	PL_markstack_max = PL_markstack + 32;
469		412
		413	#ifdef SET_MARK_OFFSET
470	SET_MARK_OFFSET;	414	SET_MARK_OFFSET;
		415	#endif
471		416
472	New(54,PL_scopestack,16,I32);	417	New(54,PL_scopestack,32,I32);
473	PL_scopestack_ix = 0;	418	PL_scopestack_ix = 0;
474	PL_scopestack_max = 16;	419	PL_scopestack_max = 32;
475		420
476	New(54,PL_savestack,96,ANY);	421	New(54,PL_savestack,64,ANY);
477	PL_savestack_ix = 0;	422	PL_savestack_ix = 0;
478	PL_savestack_max = 96;	423	PL_savestack_max = 64;
479		424
		425	#if !PERL_VERSION_ATLEAST (5,9,0)
480	New(54,PL_retstack,8,OP*);	426	New(54,PL_retstack,16,OP*);
481	PL_retstack_ix = 0;	427	PL_retstack_ix = 0;
482	PL_retstack_max = 8;	428	PL_retstack_max = 16;
		429	#endif
483	}	430	}
484		431
485	/*	432	/*
486	* destroy the stacks, the callchain etc...	433	* destroy the stacks, the callchain etc...
487	* still there is a memleak of 128 bytes...
488	*/	434	*/
489	STATIC void	435	static void
490	destroy_stacks(pTHX)	436	coro_destroy_stacks ()
491	{	437	{
492	int destruct = PL_main_cv != Nullcv;	438	if (!IN_DESTRUCT)
493
494	if (destruct)
495	{	439	{
496	/* is this ugly, I ask? */	440	/* is this ugly, I ask? */
497	while (PL_scopestack_ix)	441	LEAVE_SCOPE (0);
498	LEAVE;
499		442
500	/* sure it is, but more important: is it correct?? :/ */	443	/* sure it is, but more important: is it correct?? :/ */
501	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
502	FREETMPS;	444	FREETMPS;
		445
		446	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
503	}	447	}
504		448
505	while (PL_curstackinfo->si_next)	449	while (PL_curstackinfo->si_next)
506	PL_curstackinfo = PL_curstackinfo->si_next;	450	PL_curstackinfo = PL_curstackinfo->si_next;
507		451
508	while (PL_curstackinfo)	452	while (PL_curstackinfo)
509	{	453	{
510	PERL_SI *p = PL_curstackinfo->si_prev;	454	PERL_SI *p = PL_curstackinfo->si_prev;
511		455
512	{	456	{ /*D*//*remove*/
513	dSP;	457	dSP;
514	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	458	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
515	PUTBACK; /* possibly superfluous */	459	PUTBACK; /* possibly superfluous */
516	}	460	}
517		461
518	if (destruct)	462	if (!IN_DESTRUCT)
519	{	463	{
520	dounwind(-1);	464	dounwind (-1);/*D*//*remove*/
521	SvREFCNT_dec(PL_curstackinfo->si_stack);	465	SvREFCNT_dec (PL_curstackinfo->si_stack);
522	}	466	}
523		467
524	Safefree(PL_curstackinfo->si_cxstack);	468	Safefree (PL_curstackinfo->si_cxstack);
525	Safefree(PL_curstackinfo);	469	Safefree (PL_curstackinfo);
526	PL_curstackinfo = p;	470	PL_curstackinfo = p;
527	}	471	}
528		472
529	Safefree(PL_tmps_stack);	473	Safefree (PL_tmps_stack);
530	Safefree(PL_markstack);	474	Safefree (PL_markstack);
531	Safefree(PL_scopestack);	475	Safefree (PL_scopestack);
532	Safefree(PL_savestack);	476	Safefree (PL_savestack);
		477	#if !PERL_VERSION_ATLEAST (5,9,0)
533	Safefree(PL_retstack);	478	Safefree (PL_retstack);
534	}
535
536	static void
537	allocate_stack (Coro__State ctx, int alloc)
538	{
539	coro_stack *stack;
540
541	New (0, stack, 1, coro_stack);
542
543	stack->refcnt = 1;
544	stack->usecnt = 1;
545	stack->gencnt = ctx->gencnt = 0;
546	if (alloc)
547	{
548	#ifdef HAVE_MMAP
549	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
550	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
551	if (stack->sptr == (void *)-1)
552	#endif	479	#endif
553	{
554	/*FIXME*//*D*//* reasonable stack size! */
555	stack->ssize = -4096 * sizeof (long);
556	New (0, stack->sptr, 4096, long);
557	}
558	}
559	else
560	stack->sptr = 0;
561
562	ctx->stack = stack;
563	}	480	}
564		481
565	static void	482	static void
566	deallocate_stack (Coro__State ctx)	483	setup_coro (struct coro *coro)
567	{
568	coro_stack *stack = ctx->stack;
569
570	ctx->stack = 0;
571
572	if (stack)
573	{
574	if (!--stack->refcnt)
575	{
576	#ifdef HAVE_MMAP
577	if (stack->ssize > 0 && stack->sptr)
578	munmap (stack->sptr, stack->ssize);
579	else
580	#else
581	Safefree (stack->sptr);
582	#endif
583	Safefree (stack);
584	}
585	else if (ctx->gencnt == stack->gencnt)
586	--stack->usecnt;
587	}
588	}
589
590	static void
591	setup_coro (void *arg)
592	{	484	{
593	/*	485	/*
594	* emulate part of the perl startup here.	486	* emulate part of the perl startup here.
595	*/	487	*/
		488
		489	coro_init_stacks ();
		490
		491	PL_curcop = &PL_compiling;
		492	PL_in_eval = EVAL_NULL;
		493	PL_curpm = 0;
		494	PL_localizing = 0;
		495	PL_dirty = 0;
		496	PL_restartop = 0;
		497
		498	{
		499	dSP;
		500	LOGOP myop;
		501
		502	/* I have no idea why this is needed, but it is */
		503	PUSHMARK (SP);
		504
		505	SvREFCNT_dec (GvAV (PL_defgv));
		506	GvAV (PL_defgv) = coro->args; coro->args = 0;
		507
		508	Zero (&myop, 1, LOGOP);
		509	myop.op_next = Nullop;
		510	myop.op_flags = OPf_WANT_VOID;
		511
		512	PL_op = (OP *)&myop;
		513
		514	PUSHMARK (SP);
		515	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		516	PUTBACK;
		517	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		518	SPAGAIN;
		519	}
		520
		521	ENTER; /* necessary e.g. for dounwind */
		522	}
		523
		524	static void
		525	free_coro_mortal ()
		526	{
		527	if (coro_mortal)
		528	{
		529	SvREFCNT_dec (coro_mortal);
		530	coro_mortal = 0;
		531	}
		532	}
		533
		534	static void NOINLINE
		535	prepare_cctx (coro_cctx *cctx)
		536	{
596	dSP;	537	dSP;
597	Coro__State ctx = (Coro__State)arg;	538	LOGOP myop;
598	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
599		539
600	coro_init_stacks (aTHX);	540	Zero (&myop, 1, LOGOP);
601	/*PL_curcop = 0;*/	541	myop.op_next = PL_op;
602	/*PL_in_eval = PL_in_eval;*/ /* inherit */	542	myop.op_flags = OPf_WANT_VOID;
603	SvREFCNT_dec (GvAV (PL_defgv));
604	GvAV (PL_defgv) = ctx->args;
605		543
		544	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		545
		546	PUSHMARK (SP);
		547	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		548	PUTBACK;
		549	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
606	SPAGAIN;	550	SPAGAIN;
607
608	if (ctx->stack)
609	{
610	ctx->cursp = 0;
611
612	PUSHMARK(SP);
613	PUTBACK;
614	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
615
616	if (SvTRUE (ERRSV))
617	croak (NULL);
618	else
619	croak ("FATAL: CCTXT coroutine returned!");
620	}
621	else
622	{
623	UNOP myop;
624
625	PL_op = (OP *)&myop;
626
627	Zero(&myop, 1, UNOP);
628	myop.op_next = Nullop;
629	myop.op_flags = OPf_WANT_VOID;
630
631	PUSHMARK(SP);
632	XPUSHs (sub_init);
633	/*
634	* the next line is slightly wrong, as PL_op->op_next
635	* is actually being executed so we skip the first op.
636	* that doesn't matter, though, since it is only
637	* pp_nextstate and we never return...
638	* ah yes, and I don't care anyways ;)
639	*/
640	PUTBACK;
641	PL_op = pp_entersub();
642	SPAGAIN;
643
644	ENTER; /* necessary e.g. for dounwind */
645	}
646	}	551	}
647		552
648	static void	553	static void
649	continue_coro (void *arg)	554	coro_run (void *arg)
650	{	555	{
		556	/* coro_run is the alternative epilogue of transfer() */
		557	UNLOCK;
		558
651	/*	559	/*
652	* this is a _very_ stripped down perl interpreter ;)	560	* this is a _very_ stripped down perl interpreter ;)
653	*/	561	*/
654	Coro__State ctx = (Coro__State)arg;
655	JMPENV coro_start_env;
656
657	/* same as JMPENV_BOOTSTRAP */
658	Zero(&coro_start_env, 1, JMPENV);
659	coro_start_env.je_ret = -1;
660	coro_start_env.je_mustcatch = TRUE;
661	PL_top_env = &coro_start_env;	562	PL_top_env = &PL_start_env;
662		563
663	ctx->cursp = 0;	564	/* inject call to cctx_init */
664	PL_op = PL_op->op_next;	565	prepare_cctx ((coro_cctx *)arg);
665	CALLRUNOPS(aTHX);
666		566
		567	/* somebody will hit me for both perl_run and PL_restartop */
		568	perl_run (PL_curinterp);
		569
		570	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
667	abort ();	571	abort ();
668	}	572	}
669		573
670	STATIC void	574	static coro_cctx *
		575	cctx_new ()
		576	{
		577	coro_cctx *cctx;
		578
		579	++cctx_count;
		580
		581	New (0, cctx, 1, coro_cctx);
		582
		583	#if HAVE_MMAP
		584
		585	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		586	/* mmap suppsedly does allocate-on-write for us */
		587	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		588
		589	if (cctx->sptr == (void *)-1)
		590	{
		591	perror ("FATAL: unable to mmap stack for coroutine");
		592	_exit (EXIT_FAILURE);
		593	}
		594
		595	# if STACKGUARD
		596	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		597	# endif
		598
		599	#else
		600
		601	cctx->ssize = STACKSIZE * (long)sizeof (long);
		602	New (0, cctx->sptr, STACKSIZE, long);
		603
		604	if (!cctx->sptr)
		605	{
		606	perror ("FATAL: unable to malloc stack for coroutine");
		607	_exit (EXIT_FAILURE);
		608	}
		609
		610	#endif
		611
		612	#if USE_VALGRIND
		613	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		614	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		615	cctx->ssize + (char *)cctx->sptr
		616	);
		617	#endif
		618
		619	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		620
		621	return cctx;
		622	}
		623
		624	static void
		625	cctx_destroy (coro_cctx *cctx)
		626	{
		627	if (!cctx)
		628	return;
		629
		630	--cctx_count;
		631
		632	#if USE_VALGRIND
		633	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		634	#endif
		635
		636	#if HAVE_MMAP
		637	munmap (cctx->sptr, cctx->ssize);
		638	#else
		639	Safefree (cctx->sptr);
		640	#endif
		641
		642	Safefree (cctx);
		643	}
		644
		645	static coro_cctx *
		646	cctx_get ()
		647	{
		648	coro_cctx *cctx;
		649
		650	if (cctx_first)
		651	{
		652	cctx = cctx_first;
		653	cctx_first = cctx->next;
		654	--cctx_idle;
		655	}
		656	else
		657	{
		658	cctx = cctx_new ();
		659	PL_op = PL_op->op_next;
		660	}
		661
		662	return cctx;
		663	}
		664
		665	static void
		666	cctx_put (coro_cctx *cctx)
		667	{
		668	/* free another cctx if overlimit */
		669	if (cctx_idle >= MAX_IDLE_CCTX)
		670	{
		671	coro_cctx *first = cctx_first;
		672	cctx_first = first->next;
		673	--cctx_idle;
		674
		675	assert (!first->inuse);
		676	cctx_destroy (first);
		677	}
		678
		679	++cctx_idle;
		680	cctx->next = cctx_first;
		681	cctx_first = cctx;
		682	}
		683
		684	/* never call directly, always through the coro_state_transfer global variable */
		685	static void NOINLINE
671	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	686	transfer (struct coro *prev, struct coro *next, int flags)
672	{	687	{
673	dSTACKLEVEL;	688	dSTACKLEVEL;
674	static struct coro *xnext;
675		689
		690	/* sometimes transfer is only called to set idle_sp */
		691	if (flags == TRANSFER_SET_STACKLEVEL)
		692	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
676	if (prev != next)	693	else if (prev != next)
677	{	694	{
678	xnext = next;	695	coro_cctx *prev__cctx;
		696
		697	if (prev->flags & CF_NEW)
		698	{
		699	/* create a new empty context */
		700	Newz (0, prev->cctx, 1, coro_cctx);
		701	prev->cctx->inuse = 1;
		702	prev->flags &= ~CF_NEW;
		703	prev->flags |= CF_RUNNING;
		704	}
		705
		706	/*TODO: must not croak here */
		707	if (!prev->flags & CF_RUNNING)
		708	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		709
		710	if (next->flags & CF_RUNNING)
		711	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		712
		713	prev->flags &= ~CF_RUNNING;
		714	next->flags |= CF_RUNNING;
		715
		716	LOCK;
679		717
680	if (next->mainstack)	718	if (next->mainstack)
681	{	719	{
		720	/* coroutine already started */
682	SAVE (prev, flags);	721	SAVE (prev, flags);
683	LOAD (next);	722	LOAD (next);
684
685	/* mark this state as in-use */
686	next->mainstack = 0;
687	next->tmps_ix = -2;
688
689	/* stacklevel changed? if yes, grab the stack for us! */
690	if (flags & TRANSFER_SAVE_CCTXT)
691	{
692	if (!prev->stack)
693	allocate_stack (prev, 0);
694	else if (prev->cursp != stacklevel
695	&& prev->stack->usecnt > 1)
696	{
697	prev->gencnt = ++prev->stack->gencnt;
698	prev->stack->usecnt = 1;
699	}
700
701	/* has our stack been invalidated? */
702	if (next->stack && next->stack->gencnt != next->gencnt)
703	{
704	deallocate_stack (next);
705	allocate_stack (next, 1);
706	coro_create (&(next->stack->cctx),
707	continue_coro, (void *)next,
708	next->stack->sptr, labs (next->stack->ssize));
709	}
710
711	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
712	/* don't add any code here */
713	}
714
715	}	723	}
716	else if (next->tmps_ix == -2)
717	croak ("tried to transfer to running coroutine");
718	else	724	else
719	{	725	{
		726	/* need to start coroutine */
		727	assert (next->flags & CF_NEW);
		728	next->flags &= ~CF_NEW;
720	SAVE (prev, -1); /* first get rid of the old state */	729	/* first get rid of the old state */
721		730	SAVE (prev, -1);
722	if (flags & TRANSFER_SAVE_CCTXT)	731	/* setup coroutine call */
723	{
724	if (!prev->stack)
725	allocate_stack (prev, 0);
726
727	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728	{
729	setup_coro (next);
730
731	prev->stack->refcnt++;
732	prev->stack->usecnt++;
733	next->stack = prev->stack;
734	next->gencnt = prev->gencnt;
735	}
736	else
737	{
738	allocate_stack (next, 1);
739	coro_create (&(next->stack->cctx),
740	setup_coro, (void *)next,
741	next->stack->sptr, labs (next->stack->ssize));
742	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743	/* don't add any code here */
744	}
745	}
746	else
747	setup_coro (next);	732	setup_coro (next);
		733	/* need a new stack */
		734	assert (!next->stack);
748	}	735	}
		736
		737	prev__cctx = prev->cctx;
		738
		739	/* possibly "free" the cctx */
		740	if (prev__cctx->idle_sp == STACKLEVEL && 0)
		741	{
		742	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		743	assert (PL_top_env == prev__cctx->top_env);
		744
		745	prev->cctx = 0;
		746
		747	cctx_put (prev__cctx);
		748	prev__cctx->inuse = 0;
		749	}
		750
		751	if (!next->cctx)
		752	{
		753	next->cctx = cctx_get ();
		754	assert (!next->cctx->inuse);
		755	next->cctx->inuse = 1;
		756	}
		757
		758	if (prev__cctx != next->cctx)
		759	{
		760	prev__cctx->top_env = PL_top_env;
		761	PL_top_env = next->cctx->top_env;
		762	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		763	}
		764
		765	free_coro_mortal ();
		766
		767	UNLOCK;
749	}	768	}
750
751	/*
752	* xnext is now either prev or next, depending on wether
753	* we switched the c stack or not. that's why i use a global
754	* variable, that should become thread-specific at one point.
755	*/
756	xnext->cursp = stacklevel;
757	}	769	}
		770
		771	struct transfer_args
		772	{
		773	struct coro *prev, *next;
		774	int flags;
		775	};
		776
		777	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		778
		779	static void
		780	coro_state_destroy (struct coro *coro)
		781	{
		782	if (coro->refcnt--)
		783	return;
		784
		785	if (coro->mainstack && coro->mainstack != main_mainstack)
		786	{
		787	struct coro temp;
		788
		789	if (coro->flags & CF_RUNNING)
		790	croak ("FATAL: tried to destroy currently running coroutine");
		791
		792	SAVE ((&temp), TRANSFER_SAVE_ALL);
		793	LOAD (coro);
		794
		795	coro_destroy_stacks ();
		796
		797	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		798
		799	coro->mainstack = 0;
		800	}
		801
		802	cctx_destroy (coro->cctx);
		803	SvREFCNT_dec (coro->args);
		804	Safefree (coro);
		805	}
		806
		807	static int
		808	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		809	{
		810	struct coro *coro = (struct coro *)mg->mg_ptr;
		811	mg->mg_ptr = 0;
		812
		813	coro_state_destroy (coro);
		814
		815	return 0;
		816	}
		817
		818	static int
		819	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		820	{
		821	struct coro *coro = (struct coro *)mg->mg_ptr;
		822
		823	++coro->refcnt;
		824
		825	return 0;
		826	}
		827
		828	static MGVTBL coro_state_vtbl = {
		829	0, 0, 0, 0,
		830	coro_state_clear,
		831	0,
		832	#ifdef MGf_DUP
		833	coro_state_dup,
		834	#else
		835	# define MGf_DUP 0
		836	#endif
		837	};
758		838
759	static struct coro *	839	static struct coro *
760	sv_to_coro (SV *arg, const char *funcname, const char *varname)	840	SvSTATE (SV *coro)
761	{	841	{
762	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	842	HV *stash;
		843	MAGIC *mg;
		844
		845	if (SvROK (coro))
		846	coro = SvRV (coro);
		847
		848	stash = SvSTASH (coro);
		849	if (stash != coro_stash && stash != coro_state_stash)
763	{	850	{
764	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	851	/* very slow, but rare, check */
765		852	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
766	if (!he)	853	croak ("Coro::State object required");
767	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
768
769	arg = HeVAL(he);
770	}	854	}
771
772	/* must also be changed inside Coro::Cont::yield */
773	if (SvROK(arg) && SvOBJECT(SvRV(arg))
774	&& SvSTASH(SvRV(arg)) == coro_state_stash)
775	return (struct coro *) SvIV((SV*)SvRV(arg));
776		855
777	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	856	mg = SvMAGIC (coro);
778	/*NORETURN*/	857	assert (mg->mg_type == PERL_MAGIC_ext);
		858	return (struct coro *)mg->mg_ptr;
779	}	859	}
780		860
781	static void	861	static void
		862	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		863	{
		864	ta->prev = SvSTATE (prev);
		865	ta->next = SvSTATE (next);
		866	ta->flags = flags;
		867	}
		868
		869	static void
782	api_transfer(pTHX_ SV *prev, SV *next, int flags)	870	api_transfer (SV *prev, SV *next, int flags)
783	{	871	{
784	transfer(aTHX_	872	struct transfer_args ta;
785	sv_to_coro (prev, "Coro::transfer", "prev"),	873
786	sv_to_coro (next, "Coro::transfer", "next"),	874	prepare_transfer (&ta, prev, next, flags);
787	flags);	875	TRANSFER (ta);
788	}	876	}
789		877
790	/** Coro ********************************************************************/	878	/** Coro ********************************************************************/
791		879
792	#define PRIO_MAX 3	880	#define PRIO_MAX 3
…		…
795	#define PRIO_LOW -1	883	#define PRIO_LOW -1
796	#define PRIO_IDLE -3	884	#define PRIO_IDLE -3
797	#define PRIO_MIN -4	885	#define PRIO_MIN -4
798		886
799	/* for Coro.pm */	887	/* for Coro.pm */
800	static GV *coro_current, *coro_idle;	888	static SV *coro_current;
801	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	889	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
802	static int coro_nready;	890	static int coro_nready;
803		891
804	static void	892	static void
805	coro_enq (SV *sv)	893	coro_enq (SV *coro_sv)
806	{	894	{
807	if (SvROK (sv))	895	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
808	{
809	SV *hv = SvRV (sv);
810	if (SvTYPE (hv) == SVt_PVHV)
811	{
812	SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0);
813	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
814
815	prio = prio > PRIO_MAX ? PRIO_MAX
816	: prio < PRIO_MIN ? PRIO_MIN
817	: prio;
818
819	av_push (coro_ready [prio - PRIO_MIN], sv);
820	coro_nready++;	896	coro_nready++;
821
822	return;
823	}
824	}
825
826	croak ("Coro::ready tried to enqueue something that is not a coroutine");
827	}	897	}
828		898
829	static SV *	899	static SV *
830	coro_deq (int min_prio)	900	coro_deq (int min_prio)
831	{	901	{
…		…
834	min_prio -= PRIO_MIN;	904	min_prio -= PRIO_MIN;
835	if (min_prio < 0)	905	if (min_prio < 0)
836	min_prio = 0;	906	min_prio = 0;
837		907
838	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	908	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
839	if (av_len (coro_ready[prio]) >= 0)	909	if (AvFILLp (coro_ready [prio]) >= 0)
840	{	910	{
841	coro_nready--;	911	coro_nready--;
842	return av_shift (coro_ready[prio]);	912	return av_shift (coro_ready [prio]);
843	}	913	}
844		914
845	return 0;	915	return 0;
846	}	916	}
847		917
848	static void	918	static int
849	api_ready (SV *coro)	919	api_ready (SV *coro_sv)
850	{	920	{
		921	struct coro *coro;
		922
		923	if (SvROK (coro_sv))
		924	coro_sv = SvRV (coro_sv);
		925
		926	coro = SvSTATE (coro_sv);
		927
		928	if (coro->flags & CF_READY)
		929	return 0;
		930
		931	#if 0 /* this is actually harmless */
		932	if (coro->flags & CF_RUNNING)
		933	croak ("Coro::ready called on currently running coroutine");
		934	#endif
		935
		936	coro->flags |= CF_READY;
		937
		938	LOCK;
851	coro_enq (SvREFCNT_inc (coro));	939	coro_enq (SvREFCNT_inc (coro_sv));
852	}	940	UNLOCK;
853		941
		942	return 1;
		943	}
		944
854	static void	945	static int
855	api_schedule (int cede)	946	api_is_ready (SV *coro_sv)
		947	{
		948	return !!SvSTATE (coro_sv)->flags & CF_READY;
		949	}
		950
		951	static void
		952	prepare_schedule (struct transfer_args *ta)
856	{	953	{
857	SV *prev, *next;	954	SV *prev, *next;
858		955
859	prev = GvSV (coro_current);	956	for (;;)
860		957	{
861	if (cede)	958	LOCK;
862	coro_enq (SvREFCNT_inc (prev));
863
864	next = coro_deq (PRIO_MIN);	959	next = coro_deq (PRIO_MIN);
		960	UNLOCK;
865		961
866	if (!next)	962	if (next)
867	next = SvREFCNT_inc (GvSV (coro_idle));	963	break;
868		964
869	GvSV (coro_current) = SvREFCNT_inc (next);	965	{
870	transfer (aTHX_	966	dSP;
871	sv_to_coro (prev, "Coro::schedule", "current coroutine"),	967
872	sv_to_coro (next, "Coro::schedule", "next coroutine"),	968	ENTER;
873	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	969	SAVETMPS;
874	SvREFCNT_dec (next);	970
875	SvREFCNT_dec (prev);	971	PUSHMARK (SP);
		972	PUTBACK;
		973	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		974
		975	FREETMPS;
		976	LEAVE;
		977	}
		978	}
		979
		980	prev = SvRV (coro_current);
		981	SvRV_set (coro_current, next);
		982
		983	/* free this only after the transfer */
		984	LOCK;
		985	free_coro_mortal ();
		986	UNLOCK;
		987	coro_mortal = prev;
		988
		989	assert (!SvROK(prev));//D
		990	assert (!SvROK(next));//D
		991
		992	ta->prev = SvSTATE (prev);
		993	ta->next = SvSTATE (next);
		994	ta->flags = TRANSFER_SAVE_ALL;
		995
		996	assert (ta->flags & CF_READY);
		997	ta->next->flags &= ~CF_READY;
		998	}
		999
		1000	static void
		1001	prepare_cede (struct transfer_args *ta)
		1002	{
		1003	api_ready (coro_current);
		1004
		1005	prepare_schedule (ta);
		1006	}
		1007
		1008	static void
		1009	api_schedule (void)
		1010	{
		1011	struct transfer_args ta;
		1012
		1013	prepare_schedule (&ta);
		1014	TRANSFER (ta);
		1015	}
		1016
		1017	static void
		1018	api_cede (void)
		1019	{
		1020	struct transfer_args ta;
		1021
		1022	prepare_cede (&ta);
		1023	TRANSFER (ta);
876	}	1024	}
877		1025
878	MODULE = Coro::State PACKAGE = Coro::State	1026	MODULE = Coro::State PACKAGE = Coro::State
879		1027
880	PROTOTYPES: ENABLE	1028	PROTOTYPES: DISABLE
881		1029
882	BOOT:	1030	BOOT:
883	{ /* {} necessary for stoopid perl-5.6.x */	1031	{
884	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1032	#ifdef USE_ITHREADS
885	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1033	MUTEX_INIT (&coro_mutex);
		1034	#endif
		1035	BOOT_PAGESIZE;
		1036
886	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1037	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
887		1038
888	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1039	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
889	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1040	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
890	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1041	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
891	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
892
893	if (!padlist_cache)
894	padlist_cache = newHV ();
895		1042
896	main_mainstack = PL_mainstack;	1043	main_mainstack = PL_mainstack;
897		1044
898	coroapi.ver = CORO_API_VERSION;	1045	coroapi.ver = CORO_API_VERSION;
899	coroapi.transfer = api_transfer;	1046	coroapi.transfer = api_transfer;
900	}
901		1047
902	Coro::State	1048	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
903	_newprocess(args)	1049	}
904	SV * args	1050
905	PROTOTYPE: $	1051	SV *
		1052	new (char *klass, ...)
906	CODE:	1053	CODE:
907	Coro__State coro;	1054	{
		1055	struct coro *coro;
		1056	HV *hv;
		1057	int i;
908		1058
909	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
910	croak ("Coro::State::_newprocess expects an arrayref");
911
912	New (0, coro, 1, struct coro);	1059	Newz (0, coro, 1, struct coro);
		1060	coro->args = newAV ();
		1061	coro->flags = CF_NEW;
913		1062
914	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1063	hv = newHV ();
915	coro->mainstack = 0; /* actual work is done inside transfer */	1064	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
916	coro->stack = 0;	1065	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
917		1066
918	RETVAL = coro;	1067	for (i = 1; i < items; i++)
		1068	av_push (coro->args, newSVsv (ST (i)));
		1069	}
919	OUTPUT:	1070	OUTPUT:
920	RETVAL	1071	RETVAL
921		1072
922	void	1073	void
923	transfer(prev, next, flags)	1074	_set_stacklevel (...)
924	Coro::State_or_hashref prev	1075	ALIAS:
925	Coro::State_or_hashref next	1076	Coro::State::transfer = 1
926	int flags	1077	Coro::schedule = 2
927	PROTOTYPE: @	1078	Coro::cede = 3
		1079	Coro::Cont::yield = 4
928	CODE:	1080	CODE:
929	PUTBACK;	1081	{
930	transfer (aTHX_ prev, next, flags);	1082	struct transfer_args ta;
931	SPAGAIN;	1083
		1084	switch (ix)
		1085	{
		1086	case 0:
		1087	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1088	ta.next = 0;
		1089	ta.flags = TRANSFER_SET_STACKLEVEL;
		1090	break;
		1091
		1092	case 1:
		1093	if (items != 3)
		1094	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1095
		1096	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1097	break;
		1098
		1099	case 2:
		1100	prepare_schedule (&ta);
		1101	break;
		1102
		1103	case 3:
		1104	prepare_cede (&ta);
		1105	break;
		1106
		1107	case 4:
		1108	{
		1109	SV *yieldstack;
		1110	SV *sv;
		1111	AV *defav = GvAV (PL_defgv);
		1112
		1113	yieldstack = *hv_fetch (
		1114	(HV *)SvRV (coro_current),
		1115	"yieldstack", sizeof ("yieldstack") - 1,
		1116	0
		1117	);
		1118
		1119	/* set up @_ -- ugly */
		1120	av_clear (defav);
		1121	av_fill (defav, items - 1);
		1122	while (items--)
		1123	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1124
		1125	sv = av_pop ((AV *)SvRV (yieldstack));
		1126	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1127	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1128	ta.flags = 0;
		1129	SvREFCNT_dec (sv);
		1130	}
		1131	break;
		1132
		1133	}
		1134
		1135	TRANSFER (ta);
		1136	}
932		1137
933	void	1138	void
934	DESTROY(coro)	1139	_clone_state_from (SV *dst, SV *src)
935	Coro::State coro	1140	CODE:
936	CODE:	1141	{
		1142	struct coro *coro_src = SvSTATE (src);
937		1143
938	if (coro->mainstack && coro->mainstack != main_mainstack)	1144	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
939	{
940	struct coro temp;
941		1145
942	PUTBACK;	1146	++coro_src->refcnt;
943	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1147	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
944	LOAD(aTHX_ coro);	1148	}
945	SPAGAIN;
946
947	destroy_stacks (aTHX);
948
949	LOAD((&temp)); /* this will get rid of defsv etc.. */
950	SPAGAIN;
951
952	coro->mainstack = 0;
953	}
954
955	deallocate_stack (coro);
956
957	Safefree (coro);
958		1149
959	void	1150	void
960	flush()
961	CODE:
962	#ifdef MAY_FLUSH
963	flush_padlist_cache ();
964	#endif
965
966	void
967	_exit(code)	1151	_exit (code)
968	int code	1152	int code
969	PROTOTYPE: $	1153	PROTOTYPE: $
970	CODE:	1154	CODE:
971	#if defined(__GLIBC__) || _POSIX_C_SOURCE
972	_exit (code);	1155	_exit (code);
973	#else
974	signal (SIGTERM, SIG_DFL);
975	raise (SIGTERM);
976	exit (code);
977	#endif
978		1156
979	MODULE = Coro::State PACKAGE = Coro::Cont	1157	int
		1158	cctx_count ()
		1159	CODE:
		1160	RETVAL = cctx_count;
		1161	OUTPUT:
		1162	RETVAL
980		1163
981	# this is slightly dirty (should expose a c-level api)	1164	int
982		1165	cctx_idle ()
983	void	1166	CODE:
984	yield(...)	1167	RETVAL = cctx_idle;
985	PROTOTYPE: @	1168	OUTPUT:
986	CODE:	1169	RETVAL
987	static SV *returnstk;
988	SV *sv;
989	AV *defav = GvAV (PL_defgv);
990	struct coro *prev, *next;
991
992	if (!returnstk)
993	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
994
995	/* set up @_ -- ugly */
996	av_clear (defav);
997	av_fill (defav, items - 1);
998	while (items--)
999	av_store (defav, items, SvREFCNT_inc (ST(items)));
1000
1001	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1002	sv = av_pop ((AV *)SvRV (returnstk));
1003	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1004	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1005	SvREFCNT_dec (sv);
1006
1007	transfer(aTHX_ prev, next, 0);
1008		1170
1009	MODULE = Coro::State PACKAGE = Coro	1171	MODULE = Coro::State PACKAGE = Coro
1010		1172
1011	# this is slightly dirty (should expose a c-level api)
1012
1013	BOOT:	1173	BOOT:
1014	{	1174	{
1015	int i;	1175	int i;
		1176
1016	HV *stash = gv_stashpv ("Coro", TRUE);	1177	coro_stash = gv_stashpv ("Coro", TRUE);
1017		1178
1018	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1179	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1019	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1180	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1020	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1181	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1021	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1182	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1022	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1183	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1023	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1184	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1024		1185
1025	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1186	coro_current = get_sv ("Coro::current", FALSE);
1026	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1187	SvREADONLY_on (coro_current);
1027		1188
1028	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1189	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1029	coro_ready[i] = newAV ();	1190	coro_ready[i] = newAV ();
1030		1191
1031	{	1192	{
1032	SV *sv = perl_get_sv("Coro::API", 1);	1193	SV *sv = perl_get_sv("Coro::API", 1);
1033		1194
1034	coroapi.schedule = api_schedule;	1195	coroapi.schedule = api_schedule;
		1196	coroapi.cede = api_cede;
1035	coroapi.ready = api_ready;	1197	coroapi.ready = api_ready;
		1198	coroapi.is_ready = api_is_ready;
1036	coroapi.nready = &coro_nready;	1199	coroapi.nready = &coro_nready;
1037	coroapi.current = coro_current;	1200	coroapi.current = coro_current;
1038		1201
1039	GCoroAPI = &coroapi;	1202	GCoroAPI = &coroapi;
1040	sv_setiv(sv, (IV)&coroapi);	1203	sv_setiv (sv, (IV)&coroapi);
1041	SvREADONLY_on(sv);	1204	SvREADONLY_on (sv);
1042	}	1205	}
1043	}	1206	}
1044		1207
1045	void	1208	int
		1209	prio (Coro::State coro, int newprio = 0)
		1210	ALIAS:
		1211	nice = 1
		1212	CODE:
		1213	{
		1214	RETVAL = coro->prio;
		1215
		1216	if (items > 1)
		1217	{
		1218	if (ix)
		1219	newprio += coro->prio;
		1220
		1221	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1222	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1223
		1224	coro->prio = newprio;
		1225	}
		1226	}
		1227
		1228	SV *
1046	ready(self)	1229	ready (SV *self)
1047	SV * self	1230	PROTOTYPE: $
1048	CODE:	1231	CODE:
1049	api_ready (self);	1232	RETVAL = boolSV (api_ready (self));
		1233	OUTPUT:
		1234	RETVAL
		1235
		1236	SV *
		1237	is_ready (SV *self)
		1238	PROTOTYPE: $
		1239	CODE:
		1240	RETVAL = boolSV (api_is_ready (self));
		1241	OUTPUT:
		1242	RETVAL
1050		1243
1051	int	1244	int
1052	nready(...)	1245	nready (...)
1053	PROTOTYPE:	1246	PROTOTYPE:
1054	CODE:	1247	CODE:
1055	RETVAL = coro_nready;	1248	RETVAL = coro_nready;
1056	OUTPUT:	1249	OUTPUT:
1057	RETVAL	1250	RETVAL
1058		1251
1059	void	1252	void
1060	schedule(...)	1253	_set_current (SV *current)
1061	PROTOTYPE:	1254	PROTOTYPE: $
1062	ALIAS:
1063	cede = 1
1064	CODE:	1255	CODE:
1065	api_schedule (ix);	1256	SvREFCNT_dec (SvRV (coro_current));
		1257	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1066		1258
		1259	MODULE = Coro::State PACKAGE = Coro::AIO
		1260
		1261	SV *
		1262	_get_state ()
		1263	CODE:
		1264	{
		1265	struct {
		1266	int errorno;
		1267	int laststype;
		1268	int laststatval;
		1269	Stat_t statcache;
		1270	} data;
		1271
		1272	data.errorno = errno;
		1273	data.laststype = PL_laststype;
		1274	data.laststatval = PL_laststatval;
		1275	data.statcache = PL_statcache;
		1276
		1277	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1278	}
		1279	OUTPUT:
		1280	RETVAL
		1281
		1282	void
		1283	_set_state (char *data_)
		1284	PROTOTYPE: $
		1285	CODE:
		1286	{
		1287	struct {
		1288	int errorno;
		1289	int laststype;
		1290	int laststatval;
		1291	Stat_t statcache;
		1292	} *data = (void *)data_;
		1293
		1294	errno = data->errorno;
		1295	PL_laststype = data->laststype;
		1296	PL_laststatval = data->laststatval;
		1297	PL_statcache = data->statcache;
		1298	}

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