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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.41 by root, Tue Nov 27 02:51:03 2001 UTC vs.
Revision 1.112 by root, Thu Nov 30 20:52:52 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	#define PERL_VERSION_ATLEAST(a,b,c) \
		14	(PERL_REVISION > (a) \
		15	|| (PERL_REVISION == (a) \
		16	&& (PERL_VERSION > (b) \
		17	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		18
		19	#if !PERL_VERSION_ATLEAST (5,6,0)
		20	# ifndef PL_ppaddr
		21	# define PL_ppaddr ppaddr
		22	# endif
		23	# ifndef call_sv
		24	# define call_sv perl_call_sv
		25	# endif
		26	# ifndef get_sv
		27	# define get_sv perl_get_sv
		28	# endif
		29	# ifndef get_cv
		30	# define get_cv perl_get_cv
		31	# endif
		32	# ifndef IS_PADGV
		33	# define IS_PADGV(v) 0
		34	# endif
		35	# ifndef IS_PADCONST
		36	# define IS_PADCONST(v) 0
		37	# endif
		38	#endif
		39
7	#include <signal.h>	40	#include <stdio.h>
		41	#include <errno.h>
		42
		43	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		44	# undef STACKGUARD
		45	#endif
		46
		47	#ifndef STACKGUARD
		48	# define STACKGUARD 0
		49	#endif
8		50
9	#ifdef HAVE_MMAP	51	#ifdef HAVE_MMAP
10	# include <unistd.h>	52	# include <unistd.h>
11	# include <sys/mman.h>	53	# include <sys/mman.h>
12	# ifndef MAP_ANONYMOUS	54	# ifndef MAP_ANONYMOUS
…		…
14	# define MAP_ANONYMOUS MAP_ANON	56	# define MAP_ANONYMOUS MAP_ANON
15	# else	57	# else
16	# undef HAVE_MMAP	58	# undef HAVE_MMAP
17	# endif	59	# endif
18	# endif	60	# endif
		61	# include <limits.h>
		62	# ifndef PAGESIZE
		63	# define PAGESIZE pagesize
		64	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		65	static long pagesize;
		66	# else
		67	# define BOOT_PAGESIZE (void)0
19	#endif	68	# endif
20		69	#else
21	#define MAY_FLUSH /* increases codesize and is rarely used */	70	# define PAGESIZE 0
22		71	# define BOOT_PAGESIZE (void)0
23	#define SUB_INIT "Coro::State::initialize"	72	#endif
24	#define UCORO_STATE "_coro_state"
25		73
26	/* The next macro should declare a variable stacklevel that contains and approximation	74	/* 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	75	* to the current C stack pointer. Its property is that it changes with each call
28	* and should be unique. */	76	* and should be unique. */
		77	#define dSTACKLEVEL int stacklevel
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	78	#define STACKLEVEL ((void *)&stacklevel)
30		79
31	#define IN_DESTRUCT (PL_main_cv == Nullcv)	80	#define IN_DESTRUCT (PL_main_cv == Nullcv)
32		81
33	#define labs(l) ((l) >= 0 ? (l) : -(l))	82	#if __GNUC__ >= 3
		83	# define attribute(x) __attribute__(x)
		84	#else
		85	# define attribute(x)
		86	#endif
		87
		88	#define NOINLINE attribute ((noinline))
34		89
35	#include "CoroAPI.h"	90	#include "CoroAPI.h"
36		91
		92	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		93
		94	#ifdef USE_ITHREADS
		95	static perl_mutex coro_mutex;
		96	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		97	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		98	#else
		99	# define LOCK (void)0
		100	# define UNLOCK (void)0
		101	#endif
		102
37	static struct CoroAPI coroapi;	103	static struct CoroAPI coroapi;
		104	static AV *main_mainstack; /* used to differentiate between $main and others */
		105	static HV *coro_state_stash, *coro_stash;
		106	static SV *coro_mortal; /* will be freed after next transfer */
38		107
39	/* this is actually not only the c stack but also c registers etc... */	108	static struct coro_cctx *cctx_first;
		109	static int cctx_count, cctx_idle;
		110
		111	/* this is a structure representing a c-level coroutine */
40	typedef struct {	112	typedef struct coro_cctx {
41	int refcnt; /* pointer reference counter */	113	struct coro_cctx *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		114
45	coro_context cctx;	115	/* the stack */
46
47	void *sptr;	116	void *sptr;
48	long ssize; /* positive == mmap, otherwise malloc */	117	long ssize; /* positive == mmap, otherwise malloc */
49	} coro_stack;
50		118
		119	/* cpu state */
		120	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		121	JMPENV *top_env;
		122	coro_context cctx;
		123
		124	int inuse;
		125
		126	#if USE_VALGRIND
		127	int valgrind_id;
		128	#endif
		129	} coro_cctx;
		130
		131	enum {
		132	CF_RUNNING, /* coroutine is running */
		133	CF_READY, /* coroutine is ready */
		134	};
		135
		136	/* this is a structure representing a perl-level coroutine */
51	struct coro {	137	struct coro {
52	/* the optional C context */	138	/* the c coroutine allocated to this perl coroutine, if any */
53	coro_stack *stack;	139	coro_cctx *cctx;
54	void *cursp;	140
		141	/* data associated with this coroutine (initial args) */
		142	AV *args;
55	int gencnt;	143	int refcnt;
		144	int flags;
56		145
57	/* optionally saved, might be zero */	146	/* optionally saved, might be zero */
58	AV *defav;	147	AV *defav;
59	SV *defsv;	148	SV *defsv;
60	SV *errsv;	149	SV *errsv;
61		150
62	/* saved global state not related to stacks */	151	#define VAR(name,type) type name;
63	U8 dowarn;	152	# include "state.h"
64	I32 in_eval;	153	#undef VAR
65		154
66	/* the stacks and related info (callchain etc..) */	155	/* coro process data */
67	PERL_SI *curstackinfo;	156	int prio;
68	AV *curstack;
69	AV *mainstack;
70	SV **stack_sp;
71	OP *op;
72	SV **curpad;
73	SV **stack_base;
74	SV **stack_max;
75	SV **tmps_stack;
76	I32 tmps_floor;
77	I32 tmps_ix;
78	I32 tmps_max;
79	I32 *markstack;
80	I32 *markstack_ptr;
81	I32 *markstack_max;
82	I32 *scopestack;
83	I32 scopestack_ix;
84	I32 scopestack_max;
85	ANY *savestack;
86	I32 savestack_ix;
87	I32 savestack_max;
88	OP **retstack;
89	I32 retstack_ix;
90	I32 retstack_max;
91	COP *curcop;
92	JMPENV *top_env;
93
94	/* data associated with this coroutine (initial args) */
95	AV *args;
96	};	157	};
97		158
98	typedef struct coro *Coro__State;	159	typedef struct coro *Coro__State;
99	typedef struct coro *Coro__State_or_hashref;	160	typedef struct coro *Coro__State_or_hashref;
100		161
101	static AV *main_mainstack; /* used to differentiate between $main and others */	162	static AV *
102	static HV *coro_state_stash;	163	coro_clone_padlist (CV *cv)
103	static SV *ucoro_state_sv;
104	static U32 ucoro_state_hash;
105	static HV *padlist_cache;
106	static SV *coro_mortal; /* will be freed after next transfer */
107
108	/* mostly copied from op.c:cv_clone2 */
109	STATIC AV *
110	clone_padlist (AV *protopadlist)
111	{	164	{
112	AV *av;	165	AV *padlist = CvPADLIST (cv);
113	I32 ix;
114	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
115	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
116	SV **pname = AvARRAY (protopad_name);
117	SV **ppad = AvARRAY (protopad);
118	I32 fname = AvFILLp (protopad_name);
119	I32 fpad = AvFILLp (protopad);
120	AV *newpadlist, *newpad_name, *newpad;	166	AV *newpadlist, *newpad;
121	SV **npad;
122
123	newpad_name = newAV ();
124	for (ix = fname; ix >= 0; ix--)
125	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
126
127	newpad = newAV ();
128	av_fill (newpad, AvFILLp (protopad));
129	npad = AvARRAY (newpad);
130		167
131	newpadlist = newAV ();	168	newpadlist = newAV ();
132	AvREAL_off (newpadlist);	169	AvREAL_off (newpadlist);
133	av_store (newpadlist, 0, (SV *) newpad_name);	170	#if PERL_VERSION_ATLEAST (5,9,0)
		171	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		172	#else
		173	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		174	#endif
		175	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		176	--AvFILLp (padlist);
		177
		178	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
134	av_store (newpadlist, 1, (SV *) newpad);	179	av_store (newpadlist, 1, (SV *)newpad);
135		180
136	av = newAV (); /* will be @_ */	181	return newpadlist;
137	av_extend (av, 0);	182	}
138	av_store (newpad, 0, (SV *) av);
139	AvFLAGS (av) = AVf_REIFY;
140		183
141	for (ix = fpad; ix > 0; ix--)	184	static void
		185	free_padlist (AV *padlist)
		186	{
		187	/* may be during global destruction */
		188	if (SvREFCNT (padlist))
142	{	189	{
143	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	190	I32 i = AvFILLp (padlist);
144	if (namesv && namesv != &PL_sv_undef)	191	while (i >= 0)
145	{	192	{
146	char *name = SvPVX (namesv); /* XXX */	193	SV **svp = av_fetch (padlist, i--, FALSE);
147	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	194	if (svp)
148	{ /* lexical from outside? */
149	npad[ix] = SvREFCNT_inc (ppad[ix]);
150	}	195	{
151	else
152	{ /* our own lexical */
153	SV *sv;	196	SV *sv;
154	if (*name == '&')	197	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
155	sv = SvREFCNT_inc (ppad[ix]);	198	SvREFCNT_dec (sv);
156	else if (*name == '@')	199
157	sv = (SV *) newAV ();	200	SvREFCNT_dec (*svp);
158	else if (*name == '%')
159	sv = (SV *) newHV ();
160	else
161	sv = NEWSV (0, 0);
162	if (!SvPADBUSY (sv))
163	SvPADMY_on (sv);
164	npad[ix] = sv;
165	}	201	}
166	}	202	}
167	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	203
168	{	204	SvREFCNT_dec ((SV*)padlist);
169	npad[ix] = SvREFCNT_inc (ppad[ix]);
170	}
171	else
172	{
173	SV *sv = NEWSV (0, 0);
174	SvPADTMP_on (sv);
175	npad[ix] = sv;
176	}
177	}	205	}
		206	}
178		207
179	#if 0 /* return -ENOTUNDERSTOOD */	208	static int
180	/* Now that vars are all in place, clone nested closures. */	209	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		210	{
		211	AV *padlist;
		212	AV *av = (AV *)mg->mg_obj;
181		213
182	for (ix = fpad; ix > 0; ix--) {	214	/* casting is fun. */
183	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
184	if (namesv	216	free_padlist (padlist);
185	&& namesv != &PL_sv_undef	217
186	&& !(SvFLAGS(namesv) & SVf_FAKE)	218	SvREFCNT_dec (av);
187	&& *SvPVX(namesv) == '&'	219
188	&& CvCLONE(ppad[ix]))	220	return 0;
189	{	221	}
190	CV *kid = cv_clone((CV*)ppad[ix]);	222
191	SvREFCNT_dec(ppad[ix]);	223	#define PERL_MAGIC_coro PERL_MAGIC_ext
192	CvCLONE_on(kid);	224
193	SvPADMY_on(kid);	225	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
194	npad[ix] = (SV*)kid;	226
195	}	227	#define CORO_MAGIC(cv) \
		228	SvMAGIC (cv) \
		229	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		230	? SvMAGIC (cv) \
		231	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		232	: 0
		233
		234	/* the next two functions merely cache the padlists */
		235	static void
		236	get_padlist (CV *cv)
		237	{
		238	MAGIC *mg = CORO_MAGIC (cv);
		239	AV *av;
		240
		241	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		242	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		243	else
		244	{
		245	#if 0
		246	/* this is probably cleaner, but also slower? */
		247	CV *cp = Perl_cv_clone (cv);
		248	CvPADLIST (cv) = CvPADLIST (cp);
		249	CvPADLIST (cp) = 0;
		250	SvREFCNT_dec (cp);
		251	#else
		252	CvPADLIST (cv) = coro_clone_padlist (cv);
		253	#endif
		254	}
		255	}
		256
		257	static void
		258	put_padlist (CV *cv)
		259	{
		260	MAGIC *mg = CORO_MAGIC (cv);
		261	AV *av;
		262
		263	if (!mg)
		264	{
		265	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		266	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		267	mg->mg_virtual = &vtbl_coro;
		268	mg->mg_obj = (SV *)newAV ();
196	}	269	}
197	#endif
198		270
199	return newpadlist;	271	av = (AV *)mg->mg_obj;
200	}
201		272
202	#ifdef MAY_FLUSH	273	if (AvFILLp (av) >= AvMAX (av))
203	STATIC void	274	av_extend (av, AvMAX (av) + 1);
204	free_padlist (AV *padlist)
205	{
206	/* may be during global destruction */
207	if (SvREFCNT(padlist))
208	{
209	I32 i = AvFILLp(padlist);
210	while (i >= 0)
211	{
212	SV **svp = av_fetch(padlist, i--, FALSE);
213	SV *sv = svp ? *svp : Nullsv;
214	if (sv)
215	SvREFCNT_dec(sv);
216	}
217		275
218	SvREFCNT_dec((SV*)padlist);	276	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
219	}
220	}	277	}
221	#endif
222
223	/* the next two functions merely cache the padlists */
224	STATIC void
225	get_padlist (CV *cv)
226	{
227	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
228
229	if (he && AvFILLp ((AV *)*he) >= 0)
230	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
231	else
232	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
233	}
234
235	STATIC void
236	put_padlist (CV *cv)
237	{
238	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
239
240	if (SvTYPE (*he) != SVt_PVAV)
241	{
242	SvREFCNT_dec (*he);
243	*he = (SV *)newAV ();
244	}
245
246	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
247	}
248
249	#ifdef MAY_FLUSH
250	STATIC void
251	flush_padlist_cache ()
252	{
253	HV *hv = padlist_cache;
254	padlist_cache = newHV ();
255
256	if (hv_iterinit (hv))
257	{
258	HE *he;
259	AV *padlist;
260
261	while (!!(he = hv_iternext (hv)))
262	{
263	AV *av = (AV *)HeVAL(he);
264
265	/* casting is fun. */
266	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
267	free_padlist (padlist);
268	}
269	}
270
271	SvREFCNT_dec (hv);
272	}
273	#endif
274		278
275	#define SB do {	279	#define SB do {
276	#define SE } while (0)	280	#define SE } while (0)
277		281
278	#define LOAD(state) load_state(aTHX_ (state));	282	#define LOAD(state) load_state((state));
279	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	283	#define SAVE(state,flags) save_state((state),(flags));
280		284
281	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	285	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
282		286
283	static void	287	static void
284	load_state(pTHX_ Coro__State c)	288	load_state(Coro__State c)
285	{	289	{
286	PL_dowarn = c->dowarn;	290	#define VAR(name,type) PL_ ## name = c->name;
287	PL_in_eval = c->in_eval;	291	# include "state.h"
288		292	#undef VAR
289	PL_curstackinfo = c->curstackinfo;
290	PL_curstack = c->curstack;
291	PL_mainstack = c->mainstack;
292	PL_stack_sp = c->stack_sp;
293	PL_op = c->op;
294	PL_curpad = c->curpad;
295	PL_stack_base = c->stack_base;
296	PL_stack_max = c->stack_max;
297	PL_tmps_stack = c->tmps_stack;
298	PL_tmps_floor = c->tmps_floor;
299	PL_tmps_ix = c->tmps_ix;
300	PL_tmps_max = c->tmps_max;
301	PL_markstack = c->markstack;
302	PL_markstack_ptr = c->markstack_ptr;
303	PL_markstack_max = c->markstack_max;
304	PL_scopestack = c->scopestack;
305	PL_scopestack_ix = c->scopestack_ix;
306	PL_scopestack_max = c->scopestack_max;
307	PL_savestack = c->savestack;
308	PL_savestack_ix = c->savestack_ix;
309	PL_savestack_max = c->savestack_max;
310	PL_retstack = c->retstack;
311	PL_retstack_ix = c->retstack_ix;
312	PL_retstack_max = c->retstack_max;
313	PL_curcop = c->curcop;
314	PL_top_env = c->top_env;
315		293
316	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	294	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
317	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	295	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
318	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	296	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
319		297
…		…
322	CV *cv;	300	CV *cv;
323		301
324	/* now do the ugly restore mess */	302	/* now do the ugly restore mess */
325	while ((cv = (CV *)POPs))	303	while ((cv = (CV *)POPs))
326	{	304	{
327	AV *padlist = (AV *)POPs;
328
329	if (padlist)
330	{
331	put_padlist (cv); /* mark this padlist as available */	305	put_padlist (cv); /* mark this padlist as available */
332	CvPADLIST(cv) = padlist;	306	CvDEPTH (cv) = PTR2IV (POPs);
333	#ifdef USE_THREADS	307	CvPADLIST (cv) = (AV *)POPs;
334	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
335	#endif
336	}
337
338	++CvDEPTH(cv);
339	}	308	}
340		309
341	PUTBACK;	310	PUTBACK;
342	}	311	}
343	}	312	}
344		313
345	static void	314	static void
346	save_state(pTHX_ Coro__State c, int flags)	315	save_state(Coro__State c, int flags)
347	{	316	{
348	{	317	{
349	dSP;	318	dSP;
350	I32 cxix = cxstack_ix;	319	I32 cxix = cxstack_ix;
351	PERL_CONTEXT *ccstk = cxstack;	320	PERL_CONTEXT *ccstk = cxstack;
…		…
365	PERL_CONTEXT *cx = &ccstk[cxix--];	334	PERL_CONTEXT *cx = &ccstk[cxix--];
366		335
367	if (CxTYPE(cx) == CXt_SUB)	336	if (CxTYPE(cx) == CXt_SUB)
368	{	337	{
369	CV *cv = cx->blk_sub.cv;	338	CV *cv = cx->blk_sub.cv;
		339
370	if (CvDEPTH(cv))	340	if (CvDEPTH (cv))
371	{	341	{
372	#ifdef USE_THREADS
373	/*XPUSHs ((SV *)CvOWNER(cv));*/
374	/*CvOWNER(cv) = 0;*/
375	/*error must unlock this cv etc.. etc...*/
376	#endif
377	EXTEND (SP, CvDEPTH(cv)*2);	342	EXTEND (SP, 3);
378
379	while (--CvDEPTH(cv))
380	{
381	/* this tells the restore code to increment CvDEPTH */
382	PUSHs (Nullsv);
383	PUSHs ((SV *)cv);
384	}
385		343
386	PUSHs ((SV *)CvPADLIST(cv));	344	PUSHs ((SV *)CvPADLIST(cv));
		345	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
387	PUSHs ((SV *)cv);	346	PUSHs ((SV *)cv);
388		347
		348	CvDEPTH (cv) = 0;
389	get_padlist (cv); /* this is a monster */	349	get_padlist (cv);
390	}	350	}
391	}	351	}
		352	#ifdef CXt_FORMAT
392	else if (CxTYPE(cx) == CXt_FORMAT)	353	else if (CxTYPE(cx) == CXt_FORMAT)
393	{	354	{
394	/* I never used formats, so how should I know how these are implemented? */	355	/* I never used formats, so how should I know how these are implemented? */
395	/* my bold guess is as a simple, plain sub... */	356	/* my bold guess is as a simple, plain sub... */
396	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	357	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
397	}	358	}
		359	#endif
398	}	360	}
399		361
400	if (top_si->si_type == PERLSI_MAIN)	362	if (top_si->si_type == PERLSI_MAIN)
401	break;	363	break;
402		364
…		…
410		372
411	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	373	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
412	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	374	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
413	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	375	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
414		376
415	c->dowarn = PL_dowarn;	377	#define VAR(name,type)c->name = PL_ ## name;
416	c->in_eval = PL_in_eval;	378	# include "state.h"
417		379	#undef VAR
418	c->curstackinfo = PL_curstackinfo;
419	c->curstack = PL_curstack;
420	c->mainstack = PL_mainstack;
421	c->stack_sp = PL_stack_sp;
422	c->op = PL_op;
423	c->curpad = PL_curpad;
424	c->stack_base = PL_stack_base;
425	c->stack_max = PL_stack_max;
426	c->tmps_stack = PL_tmps_stack;
427	c->tmps_floor = PL_tmps_floor;
428	c->tmps_ix = PL_tmps_ix;
429	c->tmps_max = PL_tmps_max;
430	c->markstack = PL_markstack;
431	c->markstack_ptr = PL_markstack_ptr;
432	c->markstack_max = PL_markstack_max;
433	c->scopestack = PL_scopestack;
434	c->scopestack_ix = PL_scopestack_ix;
435	c->scopestack_max = PL_scopestack_max;
436	c->savestack = PL_savestack;
437	c->savestack_ix = PL_savestack_ix;
438	c->savestack_max = PL_savestack_max;
439	c->retstack = PL_retstack;
440	c->retstack_ix = PL_retstack_ix;
441	c->retstack_max = PL_retstack_max;
442	c->curcop = PL_curcop;
443	c->top_env = PL_top_env;
444	}	380	}
445		381
446	/*	382	/*
447	* allocate various perl stacks. This is an exact copy	383	* allocate various perl stacks. This is an exact copy
448	* of perl.c:init_stacks, except that it uses less memory	384	* of perl.c:init_stacks, except that it uses less memory
449	* on the assumption that coroutines do not usually need	385	* on the (sometimes correct) assumption that coroutines do
450	* a lot of stackspace.	386	* not usually need a lot of stackspace.
451	*/	387	*/
452	STATIC void	388	static void
453	coro_init_stacks (pTHX)	389	coro_init_stacks ()
454	{	390	{
455	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	391	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
456	PL_curstackinfo->si_type = PERLSI_MAIN;	392	PL_curstackinfo->si_type = PERLSI_MAIN;
457	PL_curstack = PL_curstackinfo->si_stack;	393	PL_curstack = PL_curstackinfo->si_stack;
458	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	394	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
…		…
468		404
469	New(54,PL_markstack,16,I32);	405	New(54,PL_markstack,16,I32);
470	PL_markstack_ptr = PL_markstack;	406	PL_markstack_ptr = PL_markstack;
471	PL_markstack_max = PL_markstack + 16;	407	PL_markstack_max = PL_markstack + 16;
472		408
		409	#ifdef SET_MARK_OFFSET
473	SET_MARK_OFFSET;	410	SET_MARK_OFFSET;
		411	#endif
474		412
475	New(54,PL_scopestack,16,I32);	413	New(54,PL_scopestack,16,I32);
476	PL_scopestack_ix = 0;	414	PL_scopestack_ix = 0;
477	PL_scopestack_max = 16;	415	PL_scopestack_max = 16;
478		416
479	New(54,PL_savestack,96,ANY);	417	New(54,PL_savestack,96,ANY);
480	PL_savestack_ix = 0;	418	PL_savestack_ix = 0;
481	PL_savestack_max = 96;	419	PL_savestack_max = 96;
482		420
		421	#if !PERL_VERSION_ATLEAST (5,9,0)
483	New(54,PL_retstack,8,OP*);	422	New(54,PL_retstack,8,OP*);
484	PL_retstack_ix = 0;	423	PL_retstack_ix = 0;
485	PL_retstack_max = 8;	424	PL_retstack_max = 8;
		425	#endif
486	}	426	}
487		427
488	/*	428	/*
489	* destroy the stacks, the callchain etc...	429	* destroy the stacks, the callchain etc...
490	* still there is a memleak of 128 bytes...
491	*/	430	*/
492	STATIC void	431	static void
493	destroy_stacks(pTHX)	432	coro_destroy_stacks ()
494	{	433	{
495	if (!IN_DESTRUCT)	434	if (!IN_DESTRUCT)
496	{	435	{
497	/* is this ugly, I ask? */	436	/* is this ugly, I ask? */
498	while (PL_scopestack_ix)	437	LEAVE_SCOPE (0);
499	LEAVE;
500		438
501	/* sure it is, but more important: is it correct?? :/ */	439	/* sure it is, but more important: is it correct?? :/ */
502	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
503	FREETMPS;	440	FREETMPS;
		441
		442	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
504	}	443	}
505		444
506	while (PL_curstackinfo->si_next)	445	while (PL_curstackinfo->si_next)
507	PL_curstackinfo = PL_curstackinfo->si_next;	446	PL_curstackinfo = PL_curstackinfo->si_next;
508		447
509	while (PL_curstackinfo)	448	while (PL_curstackinfo)
510	{	449	{
511	PERL_SI *p = PL_curstackinfo->si_prev;	450	PERL_SI *p = PL_curstackinfo->si_prev;
512		451
513	{	452	{ /*D*//*remove*/
514	dSP;	453	dSP;
515	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	454	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
516	PUTBACK; /* possibly superfluous */	455	PUTBACK; /* possibly superfluous */
517	}	456	}
518		457
519	if (!IN_DESTRUCT)	458	if (!IN_DESTRUCT)
520	{	459	{
521	dounwind(-1);	460	dounwind (-1);/*D*//*remove*/
522	SvREFCNT_dec(PL_curstackinfo->si_stack);	461	SvREFCNT_dec (PL_curstackinfo->si_stack);
523	}	462	}
524		463
525	Safefree(PL_curstackinfo->si_cxstack);	464	Safefree (PL_curstackinfo->si_cxstack);
526	Safefree(PL_curstackinfo);	465	Safefree (PL_curstackinfo);
527	PL_curstackinfo = p;	466	PL_curstackinfo = p;
528	}	467	}
529		468
530	Safefree(PL_tmps_stack);	469	Safefree (PL_tmps_stack);
531	Safefree(PL_markstack);	470	Safefree (PL_markstack);
532	Safefree(PL_scopestack);	471	Safefree (PL_scopestack);
533	Safefree(PL_savestack);	472	Safefree (PL_savestack);
		473	#if !PERL_VERSION_ATLEAST (5,9,0)
534	Safefree(PL_retstack);	474	Safefree (PL_retstack);
535	}
536
537	static void
538	allocate_stack (Coro__State ctx, int alloc)
539	{
540	coro_stack *stack;
541
542	New (0, stack, 1, coro_stack);
543
544	stack->refcnt = 1;
545	stack->usecnt = 1;
546	stack->gencnt = ctx->gencnt = 0;
547	if (alloc)
548	{
549	#if HAVE_MMAP
550	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
551	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
552	if (stack->sptr == (void *)-1)
553	#endif	475	#endif
554	{
555	/*FIXME*//*D*//* reasonable stack size! */
556	stack->ssize = -4096 * sizeof (long);
557	New (0, stack->sptr, 4096, long);
558	}
559	}
560	else
561	stack->sptr = 0;
562
563	ctx->stack = stack;
564	}	476	}
565		477
566	static void	478	static void
567	deallocate_stack (Coro__State ctx)	479	setup_coro (struct coro *coro)
568	{
569	coro_stack *stack = ctx->stack;
570
571	ctx->stack = 0;
572
573	if (stack)
574	{
575	if (!--stack->refcnt)
576	{
577	#ifdef HAVE_MMAP
578	if (stack->ssize > 0 && stack->sptr)
579	munmap (stack->sptr, stack->ssize);
580	else
581	#else
582	Safefree (stack->sptr);
583	#endif
584	Safefree (stack);
585	}
586	else if (ctx->gencnt == stack->gencnt)
587	--stack->usecnt;
588	}
589	}
590
591	static void
592	setup_coro (void *arg)
593	{	480	{
594	/*	481	/*
595	* emulate part of the perl startup here.	482	* emulate part of the perl startup here.
596	*/	483	*/
597	dSP;
598	Coro__State ctx = (Coro__State)arg;
599	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
600		484
601	coro_init_stacks (aTHX);	485	coro_init_stacks ();
		486
602	/*PL_curcop = 0;*/	487	PL_curcop = 0;
603	/*PL_in_eval = PL_in_eval;*/ /* inherit */	488	PL_in_eval = 0;
		489	PL_curpm = 0;
		490
		491	{
		492	dSP;
		493	LOGOP myop;
		494
		495	/* I have no idea why this is needed, but it is */
		496	PUSHMARK (SP);
		497
604	SvREFCNT_dec (GvAV (PL_defgv));	498	SvREFCNT_dec (GvAV (PL_defgv));
605	GvAV (PL_defgv) = ctx->args;	499	GvAV (PL_defgv) = coro->args; coro->args = 0;
606		500
607	SPAGAIN;
608
609	if (ctx->stack)
610	{
611	ctx->cursp = 0;
612
613	PUSHMARK(SP);
614	PUTBACK;
615	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
616
617	if (SvTRUE (ERRSV))
618	croak (NULL);
619	else
620	croak ("FATAL: CCTXT coroutine returned!");
621	}
622	else
623	{
624	UNOP myop;
625
626	PL_op = (OP *)&myop;
627
628	Zero(&myop, 1, UNOP);	501	Zero (&myop, 1, LOGOP);
629	myop.op_next = Nullop;	502	myop.op_next = Nullop;
630	myop.op_flags = OPf_WANT_VOID;	503	myop.op_flags = OPf_WANT_VOID;
631		504
		505	PL_op = (OP *)&myop;
		506
632	PUSHMARK(SP);	507	PUSHMARK (SP);
633	XPUSHs (sub_init);	508	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
634	/*
635	* the next line is slightly wrong, as PL_op->op_next
636	* is actually being executed so we skip the first op.
637	* that doesn't matter, though, since it is only
638	* pp_nextstate and we never return...
639	* ah yes, and I don't care anyways ;)
640	*/
641	PUTBACK;	509	PUTBACK;
642	PL_op = pp_entersub();	510	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
643	SPAGAIN;	511	SPAGAIN;
644		512
645	ENTER; /* necessary e.g. for dounwind */	513	ENTER; /* necessary e.g. for dounwind */
646	}	514	}
647	}	515	}
648		516
649	static void	517	static void
650	continue_coro (void *arg)	518	free_coro_mortal ()
651	{	519	{
652	/*
653	* this is a _very_ stripped down perl interpreter ;)
654	*/
655	Coro__State ctx = (Coro__State)arg;
656	JMPENV coro_start_env;
657
658	/* same as JMPENV_BOOTSTRAP */
659	Zero(&coro_start_env, 1, JMPENV);
660	coro_start_env.je_ret = -1;
661	coro_start_env.je_mustcatch = TRUE;
662	PL_top_env = &coro_start_env;
663
664	ctx->cursp = 0;
665	PL_op = PL_op->op_next;
666	CALLRUNOPS(aTHX);
667
668	abort ();
669	}
670
671	STATIC void
672	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
673	{
674	dSTACKLEVEL;
675	static struct coro *xnext;
676
677	if (prev != next)
678	{
679	xnext = next;
680
681	if (next->mainstack)
682	{
683	SAVE (prev, flags);
684	LOAD (next);
685
686	/* mark this state as in-use */
687	next->mainstack = 0;
688	next->tmps_ix = -2;
689
690	/* stacklevel changed? if yes, grab the stack for us! */
691	if (flags & TRANSFER_SAVE_CCTXT)
692	{
693	if (!prev->stack)
694	allocate_stack (prev, 0);
695	else if (prev->cursp != stacklevel
696	&& prev->stack->usecnt > 1)
697	{
698	prev->gencnt = ++prev->stack->gencnt;
699	prev->stack->usecnt = 1;
700	}
701
702	/* has our stack been invalidated? */
703	if (next->stack && next->stack->gencnt != next->gencnt)
704	{
705	deallocate_stack (next);
706	allocate_stack (next, 1);
707	coro_create (&(next->stack->cctx),
708	continue_coro, (void *)next,
709	next->stack->sptr, labs (next->stack->ssize));
710	}
711
712	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
713	/* don't add any code here */
714	}
715
716	}
717	else if (next->tmps_ix == -2)
718	croak ("tried to transfer to running coroutine");
719	else
720	{
721	SAVE (prev, -1); /* first get rid of the old state */
722
723	if (flags & TRANSFER_SAVE_CCTXT)
724	{
725	if (!prev->stack)
726	allocate_stack (prev, 0);
727
728	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
729	{
730	setup_coro (next);
731
732	prev->stack->refcnt++;
733	prev->stack->usecnt++;
734	next->stack = prev->stack;
735	next->gencnt = prev->gencnt;
736	}
737	else
738	{
739	allocate_stack (next, 1);
740	coro_create (&(next->stack->cctx),
741	setup_coro, (void *)next,
742	next->stack->sptr, labs (next->stack->ssize));
743	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
744	/* don't add any code here */
745	}
746	}
747	else
748	setup_coro (next);
749	}
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	}
758
759	if (coro_mortal)	520	if (coro_mortal)
760	{	521	{
761	SvREFCNT_dec (coro_mortal);	522	SvREFCNT_dec (coro_mortal);
762	coro_mortal = 0;	523	coro_mortal = 0;
763	}	524	}
764	}	525	}
765		526
766	#define SV_CORO(sv,func) \	527	static void NOINLINE
767	do { \	528	prepare_cctx (coro_cctx *cctx)
768	if (SvROK (sv)) \	529	{
769	sv = SvRV (sv); \	530	dSP;
770	\	531	LOGOP myop;
771	if (SvTYPE(sv) == SVt_PVHV) \
772	{ \
773	HE *he = hv_fetch_ent((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
774	\
775	if (!he) \
776	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
777	\
778	(sv) = SvRV (HeVAL(he)); \
779	} \
780	\
781	/* must also be changed inside Coro::Cont::yield */ \
782	if (!SvOBJECT(sv) || SvSTASH(sv) != coro_state_stash) \
783	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
784	\
785	} while(0)
786		532
787	#define SvSTATE(sv) (struct coro *)SvIV (sv)	533	Zero (&myop, 1, LOGOP);
		534	myop.op_next = PL_op;
		535	myop.op_flags = OPf_WANT_VOID;
788		536
		537	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		538
		539	PUSHMARK (SP);
		540	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		541	PUTBACK;
		542	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
		543	SPAGAIN;
		544	}
		545
		546	static void
		547	coro_run (void *arg)
		548	{
		549	/* coro_run is the alternative epilogue of transfer() */
		550	UNLOCK;
		551
		552	/*
		553	* this is a _very_ stripped down perl interpreter ;)
		554	*/
		555	PL_top_env = &PL_start_env;
		556
		557	/* inject call to cctx_init */
		558	prepare_cctx ((coro_cctx *)arg);
		559
		560	/* somebody will hit me for both perl_run and PL_restartop */
		561	perl_run (PL_curinterp);
		562
		563	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
		564	abort ();
		565	}
		566
		567	static coro_cctx *
		568	cctx_new ()
		569	{
		570	coro_cctx *cctx;
		571
		572	++cctx_count;
		573
		574	New (0, cctx, 1, coro_cctx);
		575
		576	#if HAVE_MMAP
		577
		578	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		579	/* mmap suppsedly does allocate-on-write for us */
		580	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		581
		582	if (cctx->sptr == (void *)-1)
		583	{
		584	perror ("FATAL: unable to mmap stack for coroutine");
		585	_exit (EXIT_FAILURE);
		586	}
		587
		588	# if STACKGUARD
		589	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		590	# endif
		591
		592	#else
		593
		594	cctx->ssize = STACKSIZE * (long)sizeof (long);
		595	New (0, cctx->sptr, STACKSIZE, long);
		596
		597	if (!cctx->sptr)
		598	{
		599	perror ("FATAL: unable to malloc stack for coroutine");
		600	_exit (EXIT_FAILURE);
		601	}
		602
		603	#endif
		604
		605	#if USE_VALGRIND
		606	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		607	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		608	cctx->ssize + (char *)cctx->sptr
		609	);
		610	#endif
		611
		612	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		613
		614	return cctx;
		615	}
		616
		617	static void
		618	cctx_free (coro_cctx *cctx)
		619	{
		620	if (!cctx)
		621	return;
		622
		623	--cctx_count;
		624
		625	#if USE_VALGRIND
		626	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		627	#endif
		628
		629	#if HAVE_MMAP
		630	munmap (cctx->sptr, cctx->ssize);
		631	#else
		632	Safefree (cctx->sptr);
		633	#endif
		634
		635	Safefree (cctx);
		636	}
		637
		638	static coro_cctx *
		639	cctx_get ()
		640	{
		641	coro_cctx *cctx;
		642
		643	if (cctx_first)
		644	{
		645	--cctx_idle;
		646	cctx = cctx_first;
		647	cctx_first = cctx->next;
		648	}
		649	else
		650	{
		651	cctx = cctx_new ();
		652	PL_op = PL_op->op_next;
		653	}
		654
		655	return cctx;
		656	}
		657
		658	static void
		659	cctx_put (coro_cctx *cctx)
		660	{
		661	++cctx_idle;
		662	cctx->next = cctx_first;
		663	cctx_first = cctx;
		664	}
		665
		666	/* never call directly, always through the coro_state_transfer global variable */
		667	static void NOINLINE
		668	transfer (struct coro *prev, struct coro *next, int flags)
		669	{
		670	dSTACKLEVEL;
		671
		672	/* sometimes transfer is only called to set idle_sp */
		673	if (flags == TRANSFER_SET_STACKLEVEL)
		674	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		675	else if (prev != next)
		676	{
		677	coro_cctx *prev__cctx;
		678
		679	if (!prev->cctx)
		680	{
		681	/* create a new empty context */
		682	Newz (0, prev->cctx, 1, coro_cctx);
		683	prev->cctx->inuse = 1;
		684	prev->flags |= CF_RUNNING;
		685	}
		686
		687	if (!prev->flags & CF_RUNNING)
		688	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		689
		690	if (next->flags & CF_RUNNING)
		691	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		692
		693	prev->flags &= ~CF_RUNNING;
		694	next->flags |= CF_RUNNING;
		695
		696	LOCK;
		697
		698	if (next->mainstack)
		699	{
		700	/* coroutine already started */
		701	SAVE (prev, flags);
		702	LOAD (next);
		703	}
		704	else
		705	{
		706	/* need to start coroutine */
		707	/* first get rid of the old state */
		708	SAVE (prev, -1);
		709	/* setup coroutine call */
		710	setup_coro (next);
		711	/* need a new stack */
		712	assert (!next->stack);
		713	}
		714
		715	prev__cctx = prev->cctx;
		716
		717	/* possibly "free" the cctx */
		718	if (prev__cctx->idle_sp == STACKLEVEL)
		719	{
		720	assert (PL_top_env == prev__cctx->top_env);
		721
		722	cctx_put (prev__cctx);
		723	prev->cctx = 0;
		724	}
		725
		726	if (!next->cctx)
		727	next->cctx = cctx_get ();
		728
		729	if (prev__cctx != next->cctx)
		730	{
		731	assert ( prev__cctx->inuse);
		732	assert (!next->cctx->inuse);
		733
		734	prev__cctx->inuse = 0;
		735	next->cctx->inuse = 1;
		736
		737	prev__cctx->top_env = PL_top_env;
		738	PL_top_env = next->cctx->top_env;
		739	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		740	}
		741
		742	free_coro_mortal ();
		743
		744	UNLOCK;
		745	}
		746	}
		747
		748	struct transfer_args
		749	{
		750	struct coro *prev, *next;
		751	int flags;
		752	};
		753
		754	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		755
		756	static void
		757	coro_state_destroy (struct coro *coro)
		758	{
		759	if (coro->refcnt--)
		760	return;
		761
		762	if (coro->flags & CF_RUNNING)
		763	croak ("FATAL: tried to destroy currently running coroutine");
		764
		765	if (coro->mainstack && coro->mainstack != main_mainstack)
		766	{
		767	struct coro temp;
		768
		769	SAVE ((&temp), TRANSFER_SAVE_ALL);
		770	LOAD (coro);
		771
		772	coro_destroy_stacks ();
		773
		774	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		775
		776	coro->mainstack = 0;
		777	}
		778
		779	cctx_free (coro->cctx);
		780	SvREFCNT_dec (coro->args);
		781	Safefree (coro);
		782	}
		783
789	static void	784	static int
		785	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		786	{
		787	struct coro *coro = (struct coro *)mg->mg_ptr;
		788	mg->mg_ptr = 0;
		789
		790	coro_state_destroy (coro);
		791
		792	return 0;
		793	}
		794
		795	static int
		796	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		797	{
		798	struct coro *coro = (struct coro *)mg->mg_ptr;
		799
		800	++coro->refcnt;
		801
		802	return 0;
		803	}
		804
		805	static MGVTBL coro_state_vtbl = {
		806	0, 0, 0, 0,
		807	coro_state_clear,
		808	0,
		809	#ifdef MGf_DUP
		810	coro_state_dup,
		811	#else
		812	# define MGf_DUP 0
		813	#endif
		814	};
		815
		816	static struct coro *
		817	SvSTATE (SV *coro)
		818	{
		819	HV *stash;
		820	MAGIC *mg;
		821
		822	if (SvROK (coro))
		823	coro = SvRV (coro);
		824
		825	stash = SvSTASH (coro);
		826	if (stash != coro_stash && stash != coro_state_stash)
		827	{
		828	/* very slow, but rare, check */
		829	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		830	croak ("Coro::State object required");
		831	}
		832
		833	mg = SvMAGIC (coro);
		834	assert (mg->mg_type == PERL_MAGIC_ext);
		835	return (struct coro *)mg->mg_ptr;
		836	}
		837
		838	static void
		839	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		840	{
		841	ta->prev = SvSTATE (prev);
		842	ta->next = SvSTATE (next);
		843	ta->flags = flags;
		844	}
		845
		846	static void
790	api_transfer(pTHX_ SV *prev, SV *next, int flags)	847	api_transfer (SV *prev, SV *next, int flags)
791	{	848	{
792	SV_CORO (prev, "Coro::transfer");	849	dTHX;
793	SV_CORO (next, "Coro::transfer");	850	struct transfer_args ta;
794		851
795	transfer(aTHX_ SvSTATE(prev), SvSTATE(next), flags);	852	prepare_transfer (&ta, prev, next, flags);
		853	TRANSFER (ta);
796	}	854	}
797		855
798	/** Coro ********************************************************************/	856	/** Coro ********************************************************************/
799		857
800	#define PRIO_MAX 3	858	#define PRIO_MAX 3
…		…
804	#define PRIO_IDLE -3	862	#define PRIO_IDLE -3
805	#define PRIO_MIN -4	863	#define PRIO_MIN -4
806		864
807	/* for Coro.pm */	865	/* for Coro.pm */
808	static GV *coro_current, *coro_idle;	866	static GV *coro_current, *coro_idle;
809	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	867	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
810	static int coro_nready;	868	static int coro_nready;
811		869
812	static void	870	static void
813	coro_enq (SV *sv)	871	coro_enq (SV *coro_sv)
814	{	872	{
815	if (SvTYPE (sv) == SVt_PVHV)
816	{
817	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
818	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
819
820	prio = prio > PRIO_MAX ? PRIO_MAX
821	: prio < PRIO_MIN ? PRIO_MIN
822	: prio;
823
824	av_push (coro_ready [prio - PRIO_MIN], sv);	873	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
825	coro_nready++;	874	coro_nready++;
826
827	return;
828	}
829
830	croak ("Coro::ready tried to enqueue something that is not a coroutine");
831	}	875	}
832		876
833	static SV *	877	static SV *
834	coro_deq (int min_prio)	878	coro_deq (int min_prio)
835	{	879	{
…		…
838	min_prio -= PRIO_MIN;	882	min_prio -= PRIO_MIN;
839	if (min_prio < 0)	883	if (min_prio < 0)
840	min_prio = 0;	884	min_prio = 0;
841		885
842	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	886	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
843	if (av_len (coro_ready[prio]) >= 0)	887	if (AvFILLp (coro_ready [prio]) >= 0)
844	{	888	{
845	coro_nready--;	889	coro_nready--;
846	return av_shift (coro_ready[prio]);	890	return av_shift (coro_ready [prio]);
847	}	891	}
848		892
849	return 0;	893	return 0;
850	}	894	}
851		895
852	static void	896	static int
853	api_ready (SV *coro)	897	api_ready (SV *coro_sv)
854	{	898	{
		899	struct coro *coro;
		900
855	if (SvROK (coro))	901	if (SvROK (coro_sv))
856	coro = SvRV (coro);	902	coro_sv = SvRV (coro_sv);
857		903
		904	coro = SvSTATE (coro_sv);
		905
		906	if (coro->flags & CF_READY)
		907	return 0;
		908
		909	if (coro->flags & CF_RUNNING)
		910	croak ("Coro::ready called on currently running coroutine");
		911
		912	coro->flags |= CF_READY;
		913
		914	LOCK;
858	coro_enq (SvREFCNT_inc (coro));	915	coro_enq (SvREFCNT_inc (coro_sv));
		916	UNLOCK;
		917
		918	return 1;
		919	}
		920
		921	static int
		922	api_is_ready (SV *coro_sv)
		923	{
		924	return !!SvSTATE (coro_sv)->flags & CF_READY;
		925	}
		926
		927	static void
		928	prepare_schedule (struct transfer_args *ta)
		929	{
		930	SV *current, *prev, *next;
		931
		932	current = GvSV (coro_current);
		933
		934	for (;;)
		935	{
		936	LOCK;
		937	next = coro_deq (PRIO_MIN);
		938	UNLOCK;
		939
		940	if (next)
		941	break;
		942
		943	{
		944	dSP;
		945
		946	ENTER;
		947	SAVETMPS;
		948
		949	PUSHMARK (SP);
		950	PUTBACK;
		951	call_sv (GvSV (coro_idle), G_DISCARD);
		952
		953	FREETMPS;
		954	LEAVE;
		955	}
		956	}
		957
		958	prev = SvRV (current);
		959	SvRV (current) = next;
		960
		961	/* free this only after the transfer */
		962	LOCK;
		963	free_coro_mortal ();
		964	UNLOCK;
		965	coro_mortal = prev;
		966
		967	ta->prev = SvSTATE (prev);
		968	ta->next = SvSTATE (next);
		969	ta->flags = TRANSFER_SAVE_ALL;
		970
		971	ta->next->flags &= ~CF_READY;
		972	}
		973
		974	static void
		975	prepare_cede (struct transfer_args *ta)
		976	{
		977	api_ready (GvSV (coro_current));
		978
		979	prepare_schedule (ta);
859	}	980	}
860		981
861	static void	982	static void
862	api_schedule (void)	983	api_schedule (void)
863	{	984	{
864	SV *prev, *next;	985	dTHX;
		986	struct transfer_args ta;
865		987
866	prev = SvRV (GvSV (coro_current));	988	prepare_schedule (&ta);
867	next = coro_deq (PRIO_MIN);	989	TRANSFER (ta);
868
869	if (!next)
870	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
871
872	/* free this only after the transfer */
873	coro_mortal = prev;
874	SV_CORO (prev, "Coro::schedule");
875
876	SvRV (GvSV (coro_current)) = next;
877
878	SV_CORO (next, "Coro::schedule");
879
880	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
881	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
882	}	990	}
883		991
884	static void	992	static void
885	api_cede (void)	993	api_cede (void)
886	{	994	{
887	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));	995	dTHX;
		996	struct transfer_args ta;
888		997
889	api_schedule ();	998	prepare_cede (&ta);
		999	TRANSFER (ta);
890	}	1000	}
891		1001
892	MODULE = Coro::State PACKAGE = Coro::State	1002	MODULE = Coro::State PACKAGE = Coro::State
893		1003
894	PROTOTYPES: ENABLE	1004	PROTOTYPES: DISABLE
895		1005
896	BOOT:	1006	BOOT:
897	{ /* {} necessary for stoopid perl-5.6.x */	1007	{
898	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1008	#ifdef USE_ITHREADS
899	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1009	MUTEX_INIT (&coro_mutex);
		1010	#endif
		1011	BOOT_PAGESIZE;
		1012
900	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1013	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
901		1014
902	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1015	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
903	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1016	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
904	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1017	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
905	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
906
907	if (!padlist_cache)
908	padlist_cache = newHV ();
909		1018
910	main_mainstack = PL_mainstack;	1019	main_mainstack = PL_mainstack;
911		1020
912	coroapi.ver = CORO_API_VERSION;	1021	coroapi.ver = CORO_API_VERSION;
913	coroapi.transfer = api_transfer;	1022	coroapi.transfer = api_transfer;
914	}
915		1023
916	Coro::State	1024	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
917	_newprocess(args)	1025	}
918	SV * args	1026
919	PROTOTYPE: $	1027	SV *
		1028	new (char *klass, ...)
920	CODE:	1029	CODE:
921	Coro__State coro;	1030	{
		1031	struct coro *coro;
		1032	HV *hv;
		1033	int i;
922		1034
923	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
924	croak ("Coro::State::_newprocess expects an arrayref");
925
926	New (0, coro, 1, struct coro);	1035	Newz (0, coro, 1, struct coro);
		1036	coro->args = newAV ();
927		1037
928	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1038	hv = newHV ();
929	coro->mainstack = 0; /* actual work is done inside transfer */	1039	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
930	coro->stack = 0;	1040	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
931		1041
932	RETVAL = coro;	1042	for (i = 1; i < items; i++)
		1043	av_push (coro->args, newSVsv (ST (i)));
		1044	}
933	OUTPUT:	1045	OUTPUT:
934	RETVAL	1046	RETVAL
935		1047
936	void	1048	void
937	transfer(prev, next, flags)	1049	_set_stacklevel (...)
938	SV *prev	1050	ALIAS:
939	SV *next	1051	Coro::State::transfer = 1
940	int flags	1052	Coro::schedule = 2
941	PROTOTYPE: @	1053	Coro::cede = 3
		1054	Coro::Cont::yield = 4
942	CODE:	1055	CODE:
943	PUTBACK;	1056	{
944	SV_CORO (next, "Coro::transfer");	1057	struct transfer_args ta;
945	SV_CORO (prev, "Coro::transfer");	1058
946	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1059	switch (ix)
947	SPAGAIN;	1060	{
		1061	case 0:
		1062	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1063	ta.next = 0;
		1064	ta.flags = TRANSFER_SET_STACKLEVEL;
		1065	break;
		1066
		1067	case 1:
		1068	if (items != 3)
		1069	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1070
		1071	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1072	break;
		1073
		1074	case 2:
		1075	prepare_schedule (&ta);
		1076	break;
		1077
		1078	case 3:
		1079	prepare_cede (&ta);
		1080	break;
		1081
		1082	case 4:
		1083	{
		1084	SV *yieldstack;
		1085	SV *sv;
		1086	AV *defav = GvAV (PL_defgv);
		1087
		1088	yieldstack = *hv_fetch (
		1089	(HV *)SvRV (GvSV (coro_current)),
		1090	"yieldstack", sizeof ("yieldstack") - 1,
		1091	0
		1092	);
		1093
		1094	/* set up @_ -- ugly */
		1095	av_clear (defav);
		1096	av_fill (defav, items - 1);
		1097	while (items--)
		1098	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1099
		1100	sv = av_pop ((AV *)SvRV (yieldstack));
		1101	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1102	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1103	ta.flags = 0;
		1104	SvREFCNT_dec (sv);
		1105	}
		1106	break;
		1107
		1108	}
		1109
		1110	TRANSFER (ta);
		1111	}
948		1112
949	void	1113	void
950	DESTROY(coro)	1114	_clone_state_from (SV *dst, SV *src)
951	Coro::State coro	1115	CODE:
952	CODE:	1116	{
		1117	struct coro *coro_src = SvSTATE (src);
953		1118
954	if (coro->mainstack && coro->mainstack != main_mainstack)	1119	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
955	{
956	struct coro temp;
957		1120
958	PUTBACK;	1121	++coro_src->refcnt;
959	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1122	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
960	LOAD(aTHX_ coro);	1123	}
961	SPAGAIN;
962
963	destroy_stacks (aTHX);
964
965	LOAD((&temp)); /* this will get rid of defsv etc.. */
966	SPAGAIN;
967
968	coro->mainstack = 0;
969	}
970
971	deallocate_stack (coro);
972
973	Safefree (coro);
974		1124
975	void	1125	void
976	flush()
977	CODE:
978	#ifdef MAY_FLUSH
979	flush_padlist_cache ();
980	#endif
981
982	void
983	_exit(code)	1126	_exit (code)
984	int code	1127	int code
985	PROTOTYPE: $	1128	PROTOTYPE: $
986	CODE:	1129	CODE:
987	#if defined(__GLIBC__) || _POSIX_C_SOURCE
988	_exit (code);	1130	_exit (code);
989	#else
990	signal (SIGTERM, SIG_DFL);
991	raise (SIGTERM);
992	exit (code);
993	#endif
994		1131
995	MODULE = Coro::State PACKAGE = Coro::Cont	1132	int
		1133	cctx_count ()
		1134	CODE:
		1135	RETVAL = cctx_count;
		1136	OUTPUT:
		1137	RETVAL
996		1138
997	# this is slightly dirty (should expose a c-level api)	1139	int
998		1140	cctx_idle ()
999	void	1141	CODE:
1000	yield(...)	1142	RETVAL = cctx_idle;
1001	PROTOTYPE: @	1143	OUTPUT:
1002	CODE:	1144	RETVAL
1003	static SV *returnstk;
1004	SV *sv;
1005	AV *defav = GvAV (PL_defgv);
1006	struct coro *prev, *next;
1007
1008	if (!returnstk)
1009	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
1010
1011	/* set up @_ -- ugly */
1012	av_clear (defav);
1013	av_fill (defav, items - 1);
1014	while (items--)
1015	av_store (defav, items, SvREFCNT_inc (ST(items)));
1016
1017	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1018	sv = av_pop ((AV *)SvRV (returnstk));
1019	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1020	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1021	SvREFCNT_dec (sv);
1022
1023	transfer(aTHX_ prev, next, 0);
1024		1145
1025	MODULE = Coro::State PACKAGE = Coro	1146	MODULE = Coro::State PACKAGE = Coro
1026		1147
1027	# this is slightly dirty (should expose a c-level api)
1028
1029	BOOT:	1148	BOOT:
1030	{	1149	{
1031	int i;	1150	int i;
		1151
1032	HV *stash = gv_stashpv ("Coro", TRUE);	1152	coro_stash = gv_stashpv ("Coro", TRUE);
1033		1153
1034	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1154	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1035	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1155	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1036	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1156	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1037	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1157	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1038	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1158	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1039	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1159	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1040		1160
1041	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1161	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1042	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1162	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1043		1163
1044	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1164	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1048	SV *sv = perl_get_sv("Coro::API", 1);	1168	SV *sv = perl_get_sv("Coro::API", 1);
1049		1169
1050	coroapi.schedule = api_schedule;	1170	coroapi.schedule = api_schedule;
1051	coroapi.cede = api_cede;	1171	coroapi.cede = api_cede;
1052	coroapi.ready = api_ready;	1172	coroapi.ready = api_ready;
		1173	coroapi.is_ready = api_is_ready;
1053	coroapi.nready = &coro_nready;	1174	coroapi.nready = &coro_nready;
1054	coroapi.current = coro_current;	1175	coroapi.current = coro_current;
1055		1176
1056	GCoroAPI = &coroapi;	1177	GCoroAPI = &coroapi;
1057	sv_setiv(sv, (IV)&coroapi);	1178	sv_setiv (sv, (IV)&coroapi);
1058	SvREADONLY_on(sv);	1179	SvREADONLY_on (sv);
1059	}	1180	}
1060	}	1181	}
1061		1182
1062	void	1183	int
		1184	prio (Coro::State coro, int newprio = 0)
		1185	ALIAS:
		1186	nice = 1
		1187	CODE:
		1188	{
		1189	RETVAL = coro->prio;
		1190
		1191	if (items > 1)
		1192	{
		1193	if (ix)
		1194	newprio += coro->prio;
		1195
		1196	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1197	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1198
		1199	coro->prio = newprio;
		1200	}
		1201	}
		1202
		1203	SV *
1063	ready(self)	1204	ready (SV *self)
1064	SV * self
1065	PROTOTYPE: $	1205	PROTOTYPE: $
1066	CODE:	1206	CODE:
1067	api_ready (self);	1207	RETVAL = boolSV (api_ready (self));
		1208	OUTPUT:
		1209	RETVAL
		1210
		1211	SV *
		1212	is_ready (SV *self)
		1213	PROTOTYPE: $
		1214	CODE:
		1215	RETVAL = boolSV (api_is_ready (self));
		1216	OUTPUT:
		1217	RETVAL
1068		1218
1069	int	1219	int
1070	nready(...)	1220	nready (...)
1071	PROTOTYPE:	1221	PROTOTYPE:
1072	CODE:	1222	CODE:
1073	RETVAL = coro_nready;	1223	RETVAL = coro_nready;
1074	OUTPUT:	1224	OUTPUT:
1075	RETVAL	1225	RETVAL
1076		1226
		1227	MODULE = Coro::State PACKAGE = Coro::AIO
		1228
		1229	SV *
		1230	_get_state ()
		1231	CODE:
		1232	{
		1233	struct {
		1234	int errorno;
		1235	int laststype;
		1236	int laststatval;
		1237	Stat_t statcache;
		1238	} data;
		1239
		1240	data.errorno = errno;
		1241	data.laststype = PL_laststype;
		1242	data.laststatval = PL_laststatval;
		1243	data.statcache = PL_statcache;
		1244
		1245	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1246	}
		1247	OUTPUT:
		1248	RETVAL
		1249
1077	void	1250	void
1078	schedule(...)	1251	_set_state (char *data_)
1079	PROTOTYPE:	1252	PROTOTYPE: $
1080	CODE:	1253	CODE:
1081	api_schedule ();	1254	{
		1255	struct {
		1256	int errorno;
		1257	int laststype;
		1258	int laststatval;
		1259	Stat_t statcache;
		1260	} *data = (void *)data_;
1082		1261
1083	void	1262	errno = data->errorno;
1084	cede(...)	1263	PL_laststype = data->laststype;
1085	PROTOTYPE:	1264	PL_laststatval = data->laststatval;
1086	CODE:	1265	PL_statcache = data->statcache;
1087	api_cede ();	1266	}
1088

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