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Comparing Coro/Coro/State.xs (file contents):
Revision 1.35 by root, Mon Sep 24 01:36:20 2001 UTC vs.
Revision 1.116 by root, Fri Dec 1 14:01:43 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
6		8
		9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
		23	# ifndef PL_ppaddr
		24	# define PL_ppaddr ppaddr
		25	# endif
		26	# ifndef call_sv
		27	# define call_sv perl_call_sv
		28	# endif
		29	# ifndef get_sv
		30	# define get_sv perl_get_sv
		31	# endif
		32	# ifndef get_cv
		33	# define get_cv perl_get_cv
		34	# endif
		35	# ifndef IS_PADGV
		36	# define IS_PADGV(v) 0
		37	# endif
		38	# ifndef IS_PADCONST
		39	# define IS_PADCONST(v) 0
		40	# endif
		41	#endif
		42
7	#include <signal.h>	43	#include <stdio.h>
		44	#include <errno.h>
		45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
8		53
9	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
10	# include <unistd.h>	55	# include <unistd.h>
11	# include <sys/mman.h>	56	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
15	# else	60	# else
16	# undef HAVE_MMAP	61	# undef HAVE_MMAP
17	# endif	62	# endif
18	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
19	#endif	71	# endif
20		72	#else
21	#define MAY_FLUSH /* increases codesize and is rarely used */	73	# define PAGESIZE 0
22		74	# define BOOT_PAGESIZE (void)0
23	#define SUB_INIT "Coro::State::initialize"	75	#endif
24	#define UCORO_STATE "_coro_state"
25		76
26	/* The next macro should declare a variable stacklevel that contains and approximation	77	/* The next macro should declare a variable stacklevel that contains and approximation
27	* to the current C stack pointer. Its property is that it changes with each call	78	* to the current C stack pointer. Its property is that it changes with each call
28	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
30		82
31	#define IN_DESTRUCT (PL_main_cv == Nullcv)	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
32		84
33	#define labs(l) ((l) >= 0 ? (l) : -(l))	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
34		92
35	#include "CoroAPI.h"	93	#include "CoroAPI.h"
36		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
37	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 */
38		110
39	/* 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 */
40	typedef struct {	115	typedef struct coro_cctx {
41	int refcnt; /* pointer reference counter */	116	struct coro_cctx *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		117
45	coro_context cctx;	118	/* the stack */
46
47	void *sptr;	119	void *sptr;
48	long ssize; /* positive == mmap, otherwise malloc */	120	long ssize; /* positive == mmap, otherwise malloc */
49	} coro_stack;
50		121
		122	/* cpu state */
		123	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		124	JMPENV *top_env;
		125	coro_context cctx;
		126
		127	int inuse;
		128
		129	#if USE_VALGRIND
		130	int valgrind_id;
		131	#endif
		132	} coro_cctx;
		133
		134	enum {
		135	CF_RUNNING, /* coroutine is running */
		136	CF_READY, /* coroutine is ready */
		137	};
		138
		139	/* this is a structure representing a perl-level coroutine */
51	struct coro {	140	struct coro {
52	/* the optional C context */	141	/* the c coroutine allocated to this perl coroutine, if any */
53	coro_stack *stack;	142	coro_cctx *cctx;
54	void *cursp;	143
		144	/* data associated with this coroutine (initial args) */
		145	AV *args;
55	int gencnt;	146	int refcnt;
		147	int flags;
56		148
57	/* optionally saved, might be zero */	149	/* optionally saved, might be zero */
58	AV *defav;	150	AV *defav;
59	SV *defsv;	151	SV *defsv;
60	SV *errsv;	152	SV *errsv;
61		153
62	/* saved global state not related to stacks */	154	#define VAR(name,type) type name;
63	U8 dowarn;	155	# include "state.h"
64	I32 in_eval;	156	#undef VAR
65		157
66	/* the stacks and related info (callchain etc..) */	158	/* coro process data */
67	PERL_SI *curstackinfo;	159	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	};	160	};
97		161
98	typedef struct coro *Coro__State;	162	typedef struct coro *Coro__State;
99	typedef struct coro *Coro__State_or_hashref;	163	typedef struct coro *Coro__State_or_hashref;
100		164
101	static AV *main_mainstack; /* used to differentiate between $main and others */	165	static AV *
102	static HV *coro_state_stash;	166	coro_clone_padlist (CV *cv)
103	static SV *ucoro_state_sv;
104	static U32 ucoro_state_hash;
105	static HV *padlist_cache;
106
107	/* mostly copied from op.c:cv_clone2 */
108	STATIC AV *
109	clone_padlist (AV *protopadlist)
110	{	167	{
111	AV *av;	168	AV *padlist = CvPADLIST (cv);
112	I32 ix;
113	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
114	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
115	SV **pname = AvARRAY (protopad_name);
116	SV **ppad = AvARRAY (protopad);
117	I32 fname = AvFILLp (protopad_name);
118	I32 fpad = AvFILLp (protopad);
119	AV *newpadlist, *newpad_name, *newpad;	169	AV *newpadlist, *newpad;
120	SV **npad;
121
122	newpad_name = newAV ();
123	for (ix = fname; ix >= 0; ix--)
124	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
125
126	newpad = newAV ();
127	av_fill (newpad, AvFILLp (protopad));
128	npad = AvARRAY (newpad);
129		170
130	newpadlist = newAV ();	171	newpadlist = newAV ();
131	AvREAL_off (newpadlist);	172	AvREAL_off (newpadlist);
132	av_store (newpadlist, 0, (SV *) newpad_name);	173	#if PERL_VERSION_ATLEAST (5,9,0)
		174	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		175	#else
		176	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		177	#endif
		178	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		179	--AvFILLp (padlist);
		180
		181	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
133	av_store (newpadlist, 1, (SV *) newpad);	182	av_store (newpadlist, 1, (SV *)newpad);
134		183
135	av = newAV (); /* will be @_ */	184	return newpadlist;
136	av_extend (av, 0);	185	}
137	av_store (newpad, 0, (SV *) av);
138	AvFLAGS (av) = AVf_REIFY;
139		186
140	for (ix = fpad; ix > 0; ix--)	187	static void
		188	free_padlist (AV *padlist)
		189	{
		190	/* may be during global destruction */
		191	if (SvREFCNT (padlist))
141	{	192	{
142	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	193	I32 i = AvFILLp (padlist);
143	if (namesv && namesv != &PL_sv_undef)	194	while (i >= 0)
144	{	195	{
145	char *name = SvPVX (namesv); /* XXX */	196	SV **svp = av_fetch (padlist, i--, FALSE);
146	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	197	if (svp)
147	{ /* lexical from outside? */
148	npad[ix] = SvREFCNT_inc (ppad[ix]);
149	}	198	{
150	else
151	{ /* our own lexical */
152	SV *sv;	199	SV *sv;
153	if (*name == '&')	200	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
154	sv = SvREFCNT_inc (ppad[ix]);	201	SvREFCNT_dec (sv);
155	else if (*name == '@')	202
156	sv = (SV *) newAV ();	203	SvREFCNT_dec (*svp);
157	else if (*name == '%')
158	sv = (SV *) newHV ();
159	else
160	sv = NEWSV (0, 0);
161	if (!SvPADBUSY (sv))
162	SvPADMY_on (sv);
163	npad[ix] = sv;
164	}	204	}
165	}	205	}
166	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	206
167	{	207	SvREFCNT_dec ((SV*)padlist);
168	npad[ix] = SvREFCNT_inc (ppad[ix]);
169	}
170	else
171	{
172	SV *sv = NEWSV (0, 0);
173	SvPADTMP_on (sv);
174	npad[ix] = sv;
175	}
176	}	208	}
		209	}
177		210
178	#if 0 /* return -ENOTUNDERSTOOD */	211	static int
179	/* Now that vars are all in place, clone nested closures. */	212	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		213	{
		214	AV *padlist;
		215	AV *av = (AV *)mg->mg_obj;
180		216
181	for (ix = fpad; ix > 0; ix--) {	217	/* casting is fun. */
182	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	218	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
183	if (namesv	219	free_padlist (padlist);
184	&& namesv != &PL_sv_undef	220
185	&& !(SvFLAGS(namesv) & SVf_FAKE)	221	SvREFCNT_dec (av);
186	&& *SvPVX(namesv) == '&'	222
187	&& CvCLONE(ppad[ix]))	223	return 0;
188	{	224	}
189	CV *kid = cv_clone((CV*)ppad[ix]);	225
190	SvREFCNT_dec(ppad[ix]);	226	#define PERL_MAGIC_coro PERL_MAGIC_ext
191	CvCLONE_on(kid);	227
192	SvPADMY_on(kid);	228	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
193	npad[ix] = (SV*)kid;	229
194	}	230	#define CORO_MAGIC(cv) \
		231	SvMAGIC (cv) \
		232	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		233	? SvMAGIC (cv) \
		234	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		235	: 0
		236
		237	/* the next two functions merely cache the padlists */
		238	static void
		239	get_padlist (CV *cv)
		240	{
		241	MAGIC *mg = CORO_MAGIC (cv);
		242	AV *av;
		243
		244	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		245	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		246	else
		247	{
		248	#if 0
		249	/* this is probably cleaner, but also slower? */
		250	CV *cp = Perl_cv_clone (cv);
		251	CvPADLIST (cv) = CvPADLIST (cp);
		252	CvPADLIST (cp) = 0;
		253	SvREFCNT_dec (cp);
		254	#else
		255	CvPADLIST (cv) = coro_clone_padlist (cv);
		256	#endif
		257	}
		258	}
		259
		260	static void
		261	put_padlist (CV *cv)
		262	{
		263	MAGIC *mg = CORO_MAGIC (cv);
		264	AV *av;
		265
		266	if (!mg)
		267	{
		268	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		269	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		270	mg->mg_virtual = &vtbl_coro;
		271	mg->mg_obj = (SV *)newAV ();
195	}	272	}
196	#endif
197		273
198	return newpadlist;	274	av = (AV *)mg->mg_obj;
199	}
200		275
201	#ifdef MAY_FLUSH	276	if (AvFILLp (av) >= AvMAX (av))
202	STATIC void	277	av_extend (av, AvMAX (av) + 1);
203	free_padlist (AV *padlist)
204	{
205	/* may be during global destruction */
206	if (SvREFCNT(padlist))
207	{
208	I32 i = AvFILLp(padlist);
209	while (i >= 0)
210	{
211	SV **svp = av_fetch(padlist, i--, FALSE);
212	SV *sv = svp ? *svp : Nullsv;
213	if (sv)
214	SvREFCNT_dec(sv);
215	}
216		278
217	SvREFCNT_dec((SV*)padlist);	279	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
218	}
219	}	280	}
220	#endif
221
222	/* the next two functions merely cache the padlists */
223	STATIC void
224	get_padlist (CV *cv)
225	{
226	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
227
228	if (he && AvFILLp ((AV *)*he) >= 0)
229	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
230	else
231	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
232	}
233
234	STATIC void
235	put_padlist (CV *cv)
236	{
237	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
238
239	if (SvTYPE (*he) != SVt_PVAV)
240	{
241	SvREFCNT_dec (*he);
242	*he = (SV *)newAV ();
243	}
244
245	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
246	}
247
248	#ifdef MAY_FLUSH
249	STATIC void
250	flush_padlist_cache ()
251	{
252	HV *hv = padlist_cache;
253	padlist_cache = newHV ();
254
255	if (hv_iterinit (hv))
256	{
257	HE *he;
258	AV *padlist;
259
260	while (!!(he = hv_iternext (hv)))
261	{
262	AV *av = (AV *)HeVAL(he);
263
264	/* casting is fun. */
265	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
266	free_padlist (padlist);
267	}
268	}
269
270	SvREFCNT_dec (hv);
271	}
272	#endif
273		281
274	#define SB do {	282	#define SB do {
275	#define SE } while (0)	283	#define SE } while (0)
276		284
277	#define LOAD(state) load_state(aTHX_ (state));	285	#define LOAD(state) load_state((state));
278	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	286	#define SAVE(state,flags) save_state((state),(flags));
279		287
280	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	288	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
281		289
282	static void	290	static void
283	load_state(pTHX_ Coro__State c)	291	load_state(Coro__State c)
284	{	292	{
285	PL_dowarn = c->dowarn;	293	#define VAR(name,type) PL_ ## name = c->name;
286	PL_in_eval = c->in_eval;	294	# include "state.h"
287		295	#undef VAR
288	PL_curstackinfo = c->curstackinfo;
289	PL_curstack = c->curstack;
290	PL_mainstack = c->mainstack;
291	PL_stack_sp = c->stack_sp;
292	PL_op = c->op;
293	PL_curpad = c->curpad;
294	PL_stack_base = c->stack_base;
295	PL_stack_max = c->stack_max;
296	PL_tmps_stack = c->tmps_stack;
297	PL_tmps_floor = c->tmps_floor;
298	PL_tmps_ix = c->tmps_ix;
299	PL_tmps_max = c->tmps_max;
300	PL_markstack = c->markstack;
301	PL_markstack_ptr = c->markstack_ptr;
302	PL_markstack_max = c->markstack_max;
303	PL_scopestack = c->scopestack;
304	PL_scopestack_ix = c->scopestack_ix;
305	PL_scopestack_max = c->scopestack_max;
306	PL_savestack = c->savestack;
307	PL_savestack_ix = c->savestack_ix;
308	PL_savestack_max = c->savestack_max;
309	PL_retstack = c->retstack;
310	PL_retstack_ix = c->retstack_ix;
311	PL_retstack_max = c->retstack_max;
312	PL_curcop = c->curcop;
313	PL_top_env = c->top_env;
314		296
315	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	297	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
316	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	298	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
317	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	299	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
318		300
…		…
321	CV *cv;	303	CV *cv;
322		304
323	/* now do the ugly restore mess */	305	/* now do the ugly restore mess */
324	while ((cv = (CV *)POPs))	306	while ((cv = (CV *)POPs))
325	{	307	{
326	AV *padlist = (AV *)POPs;
327
328	if (padlist)
329	{
330	put_padlist (cv); /* mark this padlist as available */	308	put_padlist (cv); /* mark this padlist as available */
331	CvPADLIST(cv) = padlist;	309	CvDEPTH (cv) = PTR2IV (POPs);
332	#ifdef USE_THREADS	310	CvPADLIST (cv) = (AV *)POPs;
333	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
334	#endif
335	}
336
337	++CvDEPTH(cv);
338	}	311	}
339		312
340	PUTBACK;	313	PUTBACK;
341	}	314	}
342	}	315	}
343		316
344	static void	317	static void
345	save_state(pTHX_ Coro__State c, int flags)	318	save_state(Coro__State c, int flags)
346	{	319	{
347	{	320	{
348	dSP;	321	dSP;
349	I32 cxix = cxstack_ix;	322	I32 cxix = cxstack_ix;
350	PERL_CONTEXT *ccstk = cxstack;	323	PERL_CONTEXT *ccstk = cxstack;
…		…
364	PERL_CONTEXT *cx = &ccstk[cxix--];	337	PERL_CONTEXT *cx = &ccstk[cxix--];
365		338
366	if (CxTYPE(cx) == CXt_SUB)	339	if (CxTYPE(cx) == CXt_SUB)
367	{	340	{
368	CV *cv = cx->blk_sub.cv;	341	CV *cv = cx->blk_sub.cv;
		342
369	if (CvDEPTH(cv))	343	if (CvDEPTH (cv))
370	{	344	{
371	#ifdef USE_THREADS
372	/*XPUSHs ((SV *)CvOWNER(cv));*/
373	/*CvOWNER(cv) = 0;*/
374	/*error must unlock this cv etc.. etc...*/
375	#endif
376	EXTEND (SP, CvDEPTH(cv)*2);	345	EXTEND (SP, 3);
377
378	while (--CvDEPTH(cv))
379	{
380	/* this tells the restore code to increment CvDEPTH */
381	PUSHs (Nullsv);
382	PUSHs ((SV *)cv);
383	}
384		346
385	PUSHs ((SV *)CvPADLIST(cv));	347	PUSHs ((SV *)CvPADLIST(cv));
		348	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
386	PUSHs ((SV *)cv);	349	PUSHs ((SV *)cv);
387		350
		351	CvDEPTH (cv) = 0;
388	get_padlist (cv); /* this is a monster */	352	get_padlist (cv);
389	}	353	}
390	}	354	}
		355	#ifdef CXt_FORMAT
391	else if (CxTYPE(cx) == CXt_FORMAT)	356	else if (CxTYPE(cx) == CXt_FORMAT)
392	{	357	{
393	/* I never used formats, so how should I know how these are implemented? */	358	/* I never used formats, so how should I know how these are implemented? */
394	/* my bold guess is as a simple, plain sub... */	359	/* my bold guess is as a simple, plain sub... */
395	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	360	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
396	}	361	}
		362	#endif
397	}	363	}
398		364
399	if (top_si->si_type == PERLSI_MAIN)	365	if (top_si->si_type == PERLSI_MAIN)
400	break;	366	break;
401		367
…		…
409		375
410	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	376	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
411	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	377	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
412	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	378	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
413		379
414	c->dowarn = PL_dowarn;	380	#define VAR(name,type)c->name = PL_ ## name;
415	c->in_eval = PL_in_eval;	381	# include "state.h"
416		382	#undef VAR
417	c->curstackinfo = PL_curstackinfo;
418	c->curstack = PL_curstack;
419	c->mainstack = PL_mainstack;
420	c->stack_sp = PL_stack_sp;
421	c->op = PL_op;
422	c->curpad = PL_curpad;
423	c->stack_base = PL_stack_base;
424	c->stack_max = PL_stack_max;
425	c->tmps_stack = PL_tmps_stack;
426	c->tmps_floor = PL_tmps_floor;
427	c->tmps_ix = PL_tmps_ix;
428	c->tmps_max = PL_tmps_max;
429	c->markstack = PL_markstack;
430	c->markstack_ptr = PL_markstack_ptr;
431	c->markstack_max = PL_markstack_max;
432	c->scopestack = PL_scopestack;
433	c->scopestack_ix = PL_scopestack_ix;
434	c->scopestack_max = PL_scopestack_max;
435	c->savestack = PL_savestack;
436	c->savestack_ix = PL_savestack_ix;
437	c->savestack_max = PL_savestack_max;
438	c->retstack = PL_retstack;
439	c->retstack_ix = PL_retstack_ix;
440	c->retstack_max = PL_retstack_max;
441	c->curcop = PL_curcop;
442	c->top_env = PL_top_env;
443	}	383	}
444		384
445	/*	385	/*
446	* allocate various perl stacks. This is an exact copy	386	* allocate various perl stacks. This is an exact copy
447	* of perl.c:init_stacks, except that it uses less memory	387	* of perl.c:init_stacks, except that it uses less memory
448	* on the assumption that coroutines do not usually need	388	* on the (sometimes correct) assumption that coroutines do
449	* a lot of stackspace.	389	* not usually need a lot of stackspace.
450	*/	390	*/
451	STATIC void	391	static void
452	coro_init_stacks (pTHX)	392	coro_init_stacks ()
453	{	393	{
454	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	394	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
455	PL_curstackinfo->si_type = PERLSI_MAIN;	395	PL_curstackinfo->si_type = PERLSI_MAIN;
456	PL_curstack = PL_curstackinfo->si_stack;	396	PL_curstack = PL_curstackinfo->si_stack;
457	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	397	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
458		398
459	PL_stack_base = AvARRAY(PL_curstack);	399	PL_stack_base = AvARRAY(PL_curstack);
460	PL_stack_sp = PL_stack_base;	400	PL_stack_sp = PL_stack_base;
461	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	401	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
462		402
463	New(50,PL_tmps_stack,96,SV*);	403	New(50,PL_tmps_stack,128,SV*);
464	PL_tmps_floor = -1;	404	PL_tmps_floor = -1;
465	PL_tmps_ix = -1;	405	PL_tmps_ix = -1;
466	PL_tmps_max = 96;	406	PL_tmps_max = 128;
467		407
468	New(54,PL_markstack,16,I32);	408	New(54,PL_markstack,32,I32);
469	PL_markstack_ptr = PL_markstack;	409	PL_markstack_ptr = PL_markstack;
470	PL_markstack_max = PL_markstack + 16;	410	PL_markstack_max = PL_markstack + 32;
471		411
		412	#ifdef SET_MARK_OFFSET
472	SET_MARK_OFFSET;	413	SET_MARK_OFFSET;
		414	#endif
473		415
474	New(54,PL_scopestack,16,I32);	416	New(54,PL_scopestack,32,I32);
475	PL_scopestack_ix = 0;	417	PL_scopestack_ix = 0;
476	PL_scopestack_max = 16;	418	PL_scopestack_max = 32;
477		419
478	New(54,PL_savestack,96,ANY);	420	New(54,PL_savestack,64,ANY);
479	PL_savestack_ix = 0;	421	PL_savestack_ix = 0;
480	PL_savestack_max = 96;	422	PL_savestack_max = 64;
481		423
		424	#if !PERL_VERSION_ATLEAST (5,9,0)
482	New(54,PL_retstack,8,OP*);	425	New(54,PL_retstack,16,OP*);
483	PL_retstack_ix = 0;	426	PL_retstack_ix = 0;
484	PL_retstack_max = 8;	427	PL_retstack_max = 16;
		428	#endif
485	}	429	}
486		430
487	/*	431	/*
488	* destroy the stacks, the callchain etc...	432	* destroy the stacks, the callchain etc...
489	* still there is a memleak of 128 bytes...
490	*/	433	*/
491	STATIC void	434	static void
492	destroy_stacks(pTHX)	435	coro_destroy_stacks ()
493	{	436	{
494	if (!IN_DESTRUCT)	437	if (!IN_DESTRUCT)
495	{	438	{
496	/* is this ugly, I ask? */	439	/* is this ugly, I ask? */
497	while (PL_scopestack_ix)	440	LEAVE_SCOPE (0);
498	LEAVE;
499		441
500	/* sure it is, but more important: is it correct?? :/ */	442	/* 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;	443	FREETMPS;
		444
		445	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
503	}	446	}
504		447
505	while (PL_curstackinfo->si_next)	448	while (PL_curstackinfo->si_next)
506	PL_curstackinfo = PL_curstackinfo->si_next;	449	PL_curstackinfo = PL_curstackinfo->si_next;
507		450
508	while (PL_curstackinfo)	451	while (PL_curstackinfo)
509	{	452	{
510	PERL_SI *p = PL_curstackinfo->si_prev;	453	PERL_SI *p = PL_curstackinfo->si_prev;
511		454
512	{	455	{ /*D*//*remove*/
513	dSP;	456	dSP;
514	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	457	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
515	PUTBACK; /* possibly superfluous */	458	PUTBACK; /* possibly superfluous */
516	}	459	}
517		460
518	if (!IN_DESTRUCT)	461	if (!IN_DESTRUCT)
519	{	462	{
520	dounwind(-1);	463	dounwind (-1);/*D*//*remove*/
521	SvREFCNT_dec(PL_curstackinfo->si_stack);	464	SvREFCNT_dec (PL_curstackinfo->si_stack);
522	}	465	}
523		466
524	Safefree(PL_curstackinfo->si_cxstack);	467	Safefree (PL_curstackinfo->si_cxstack);
525	Safefree(PL_curstackinfo);	468	Safefree (PL_curstackinfo);
526	PL_curstackinfo = p;	469	PL_curstackinfo = p;
527	}	470	}
528		471
529	Safefree(PL_tmps_stack);	472	Safefree (PL_tmps_stack);
530	Safefree(PL_markstack);	473	Safefree (PL_markstack);
531	Safefree(PL_scopestack);	474	Safefree (PL_scopestack);
532	Safefree(PL_savestack);	475	Safefree (PL_savestack);
		476	#if !PERL_VERSION_ATLEAST (5,9,0)
533	Safefree(PL_retstack);	477	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	478	#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	}	479	}
564		480
565	static void	481	static void
566	deallocate_stack (Coro__State ctx)	482	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	{	483	{
593	/*	484	/*
594	* emulate part of the perl startup here.	485	* emulate part of the perl startup here.
595	*/	486	*/
		487
		488	coro_init_stacks ();
		489
		490	PL_curcop = 0;
		491	PL_in_eval = 0;
		492	PL_curpm = 0;
		493
		494	{
		495	dSP;
		496	LOGOP myop;
		497
		498	/* I have no idea why this is needed, but it is */
		499	PUSHMARK (SP);
		500
		501	SvREFCNT_dec (GvAV (PL_defgv));
		502	GvAV (PL_defgv) = coro->args; coro->args = 0;
		503
		504	Zero (&myop, 1, LOGOP);
		505	myop.op_next = Nullop;
		506	myop.op_flags = OPf_WANT_VOID;
		507
		508	PL_op = (OP *)&myop;
		509
		510	PUSHMARK (SP);
		511	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		512	PUTBACK;
		513	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		514	SPAGAIN;
		515
		516	ENTER; /* necessary e.g. for dounwind */
		517	}
		518	}
		519
		520	static void
		521	free_coro_mortal ()
		522	{
		523	if (coro_mortal)
		524	{
		525	SvREFCNT_dec (coro_mortal);
		526	coro_mortal = 0;
		527	}
		528	}
		529
		530	static void NOINLINE
		531	prepare_cctx (coro_cctx *cctx)
		532	{
596	dSP;	533	dSP;
597	Coro__State ctx = (Coro__State)arg;	534	LOGOP myop;
598	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
599		535
600	coro_init_stacks (aTHX);	536	Zero (&myop, 1, LOGOP);
601	/*PL_curcop = 0;*/	537	myop.op_next = PL_op;
602	/*PL_in_eval = PL_in_eval;*/ /* inherit */	538	myop.op_flags = OPf_WANT_VOID;
603	SvREFCNT_dec (GvAV (PL_defgv));
604	GvAV (PL_defgv) = ctx->args;
605		539
		540	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		541
		542	PUSHMARK (SP);
		543	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		544	PUTBACK;
		545	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
606	SPAGAIN;	546	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	}	547	}
647		548
648	static void	549	static void
649	continue_coro (void *arg)	550	coro_run (void *arg)
650	{	551	{
		552	/* coro_run is the alternative epilogue of transfer() */
		553	UNLOCK;
		554
651	/*	555	/*
652	* this is a _very_ stripped down perl interpreter ;)	556	* this is a _very_ stripped down perl interpreter ;)
653	*/	557	*/
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;	558	PL_top_env = &PL_start_env;
662		559
663	ctx->cursp = 0;	560	/* inject call to cctx_init */
664	PL_op = PL_op->op_next;	561	prepare_cctx ((coro_cctx *)arg);
665	CALLRUNOPS(aTHX);
666		562
		563	/* somebody will hit me for both perl_run and PL_restartop */
		564	perl_run (PL_curinterp);
		565
		566	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
667	abort ();	567	abort ();
668	}	568	}
669		569
670	STATIC void	570	static coro_cctx *
		571	cctx_new ()
		572	{
		573	coro_cctx *cctx;
		574
		575	++cctx_count;
		576
		577	New (0, cctx, 1, coro_cctx);
		578
		579	#if HAVE_MMAP
		580
		581	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		582	/* mmap suppsedly does allocate-on-write for us */
		583	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		584
		585	if (cctx->sptr == (void *)-1)
		586	{
		587	perror ("FATAL: unable to mmap stack for coroutine");
		588	_exit (EXIT_FAILURE);
		589	}
		590
		591	# if STACKGUARD
		592	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		593	# endif
		594
		595	#else
		596
		597	cctx->ssize = STACKSIZE * (long)sizeof (long);
		598	New (0, cctx->sptr, STACKSIZE, long);
		599
		600	if (!cctx->sptr)
		601	{
		602	perror ("FATAL: unable to malloc stack for coroutine");
		603	_exit (EXIT_FAILURE);
		604	}
		605
		606	#endif
		607
		608	#if USE_VALGRIND
		609	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		610	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		611	cctx->ssize + (char *)cctx->sptr
		612	);
		613	#endif
		614
		615	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		616
		617	return cctx;
		618	}
		619
		620	static void
		621	cctx_destroy (coro_cctx *cctx)
		622	{
		623	if (!cctx)
		624	return;
		625
		626	--cctx_count;
		627
		628	#if USE_VALGRIND
		629	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		630	#endif
		631
		632	#if HAVE_MMAP
		633	munmap (cctx->sptr, cctx->ssize);
		634	#else
		635	Safefree (cctx->sptr);
		636	#endif
		637
		638	Safefree (cctx);
		639	}
		640
		641	static coro_cctx *
		642	cctx_get ()
		643	{
		644	coro_cctx *cctx;
		645
		646	if (cctx_first)
		647	{
		648	cctx = cctx_first;
		649	cctx_first = cctx->next;
		650	--cctx_idle;
		651	}
		652	else
		653	{
		654	cctx = cctx_new ();
		655	PL_op = PL_op->op_next;
		656	}
		657
		658	return cctx;
		659	}
		660
		661	static void
		662	cctx_put (coro_cctx *cctx)
		663	{
		664	/* free another cctx if overlimit */
		665	if (cctx_idle >= MAX_IDLE_CCTX)
		666	{
		667	coro_cctx *first = cctx_first;
		668	cctx_first = first->next;
		669	--cctx_idle;
		670
		671	assert (!first->inuse);
		672	cctx_destroy (first);
		673	}
		674
		675	++cctx_idle;
		676	cctx->next = cctx_first;
		677	cctx_first = cctx;
		678	}
		679
		680	/* never call directly, always through the coro_state_transfer global variable */
		681	static void NOINLINE
671	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	682	transfer (struct coro *prev, struct coro *next, int flags)
672	{	683	{
673	dSTACKLEVEL;	684	dSTACKLEVEL;
674	static struct coro *xnext;
675		685
		686	/* sometimes transfer is only called to set idle_sp */
		687	if (flags == TRANSFER_SET_STACKLEVEL)
		688	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
676	if (prev != next)	689	else if (prev != next)
677	{	690	{
678	xnext = next;	691	coro_cctx *prev__cctx;
		692
		693	if (!prev->cctx)
		694	{
		695	/* create a new empty context */
		696	Newz (0, prev->cctx, 1, coro_cctx);
		697	prev->cctx->inuse = 1;
		698	prev->flags |= CF_RUNNING;
		699	}
		700
		701	if (!prev->flags & CF_RUNNING)
		702	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		703
		704	if (next->flags & CF_RUNNING)
		705	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		706
		707	prev->flags &= ~CF_RUNNING;
		708	next->flags |= CF_RUNNING;
		709
		710	LOCK;
679		711
680	if (next->mainstack)	712	if (next->mainstack)
681	{	713	{
		714	/* coroutine already started */
682	SAVE (prev, flags);	715	SAVE (prev, flags);
683	LOAD (next);	716	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	}	717	}
716	else if (next->tmps_ix == -2)
717	croak ("tried to transfer to running coroutine");
718	else	718	else
719	{	719	{
		720	/* need to start coroutine */
720	SAVE (prev, -1); /* first get rid of the old state */	721	/* first get rid of the old state */
721		722	SAVE (prev, -1);
722	if (flags & TRANSFER_SAVE_CCTXT)	723	/* 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);	724	setup_coro (next);
		725	/* need a new stack */
		726	assert (!next->stack);
748	}	727	}
749		728
750	/*	729	prev__cctx = prev->cctx;
751	* xnext is now either prev or next, depending on wether	730
752	* we switched the c stack or not. that's why i use a global	731	/* possibly "free" the cctx */
753	* variable, that should become thread-specific at one point.	732	if (prev__cctx->idle_sp == STACKLEVEL)
754	*/	733	{
755	xnext->cursp = stacklevel;	734	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		735	assert (PL_top_env == prev__cctx->top_env);
		736
		737	cctx_put (prev__cctx);
		738	prev->cctx = 0;
		739	}
		740
		741	if (!next->cctx)
		742	next->cctx = cctx_get ();
		743
		744	if (prev__cctx != next->cctx)
		745	{
		746	assert ( prev__cctx->inuse);
		747	assert (!next->cctx->inuse);
		748
		749	prev__cctx->inuse = 0;
		750	next->cctx->inuse = 1;
		751
		752	prev__cctx->top_env = PL_top_env;
		753	PL_top_env = next->cctx->top_env;
		754	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		755	}
		756
		757	free_coro_mortal ();
		758
		759	UNLOCK;
756	}	760	}
757	}	761	}
758		762
		763	struct transfer_args
		764	{
		765	struct coro *prev, *next;
		766	int flags;
		767	};
		768
		769	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		770
		771	static void
		772	coro_state_destroy (struct coro *coro)
		773	{
		774	if (coro->refcnt--)
		775	return;
		776
		777	if (coro->flags & CF_RUNNING)
		778	croak ("FATAL: tried to destroy currently running coroutine");
		779
		780	if (coro->mainstack && coro->mainstack != main_mainstack)
		781	{
		782	struct coro temp;
		783
		784	SAVE ((&temp), TRANSFER_SAVE_ALL);
		785	LOAD (coro);
		786
		787	coro_destroy_stacks ();
		788
		789	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		790
		791	coro->mainstack = 0;
		792	}
		793
		794	cctx_destroy (coro->cctx);
		795	SvREFCNT_dec (coro->args);
		796	Safefree (coro);
		797	}
		798
		799	static int
		800	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		801	{
		802	struct coro *coro = (struct coro *)mg->mg_ptr;
		803	mg->mg_ptr = 0;
		804
		805	coro_state_destroy (coro);
		806
		807	return 0;
		808	}
		809
		810	static int
		811	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		812	{
		813	struct coro *coro = (struct coro *)mg->mg_ptr;
		814
		815	++coro->refcnt;
		816
		817	return 0;
		818	}
		819
		820	static MGVTBL coro_state_vtbl = {
		821	0, 0, 0, 0,
		822	coro_state_clear,
		823	0,
		824	#ifdef MGf_DUP
		825	coro_state_dup,
		826	#else
		827	# define MGf_DUP 0
		828	#endif
		829	};
		830
759	static struct coro *	831	static struct coro *
760	sv_to_coro (SV *arg, const char *funcname, const char *varname)	832	SvSTATE (SV *coro)
761	{	833	{
762	if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)	834	HV *stash;
		835	MAGIC *mg;
		836
		837	if (SvROK (coro))
		838	coro = SvRV (coro);
		839
		840	stash = SvSTASH (coro);
		841	if (stash != coro_stash && stash != coro_state_stash)
763	{	842	{
764	HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);	843	/* very slow, but rare, check */
765		844	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
766	if (!he)	845	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	}	846	}
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		847
777	croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);	848	mg = SvMAGIC (coro);
778	/*NORETURN*/	849	assert (mg->mg_type == PERL_MAGIC_ext);
		850	return (struct coro *)mg->mg_ptr;
779	}	851	}
780		852
781	static void	853	static void
		854	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		855	{
		856	ta->prev = SvSTATE (prev);
		857	ta->next = SvSTATE (next);
		858	ta->flags = flags;
		859	}
		860
		861	static void
782	api_transfer(pTHX_ SV *prev, SV *next, int flags)	862	api_transfer (SV *prev, SV *next, int flags)
783	{	863	{
784	transfer(aTHX_	864	dTHX;
785	sv_to_coro (prev, "Coro::transfer", "prev"),	865	struct transfer_args ta;
786	sv_to_coro (next, "Coro::transfer", "next"),	866
787	flags);	867	prepare_transfer (&ta, prev, next, flags);
		868	TRANSFER (ta);
788	}	869	}
789		870
790	/** Coro ********************************************************************/	871	/** Coro ********************************************************************/
791		872
792	#define PRIO_MAX 3	873	#define PRIO_MAX 3
…		…
796	#define PRIO_IDLE -3	877	#define PRIO_IDLE -3
797	#define PRIO_MIN -4	878	#define PRIO_MIN -4
798		879
799	/* for Coro.pm */	880	/* for Coro.pm */
800	static GV *coro_current, *coro_idle;	881	static GV *coro_current, *coro_idle;
801	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	882	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
802	static int coro_nready;	883	static int coro_nready;
803		884
804	static void	885	static void
805	coro_enq (SV *sv)	886	coro_enq (SV *coro_sv)
806	{	887	{
807	if (SvROK (sv))	888	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++;	889	coro_nready++;
821
822	return;
823	}
824	}
825
826	croak ("Coro::ready tried to enqueue something that is not a coroutine");
827	}	890	}
828		891
829	static SV *	892	static SV *
830	coro_deq (int min_prio)	893	coro_deq (int min_prio)
831	{	894	{
…		…
834	min_prio -= PRIO_MIN;	897	min_prio -= PRIO_MIN;
835	if (min_prio < 0)	898	if (min_prio < 0)
836	min_prio = 0;	899	min_prio = 0;
837		900
838	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	901	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
839	if (av_len (coro_ready[prio]) >= 0)	902	if (AvFILLp (coro_ready [prio]) >= 0)
840	{	903	{
841	coro_nready--;	904	coro_nready--;
842	return av_shift (coro_ready[prio]);	905	return av_shift (coro_ready [prio]);
843	}	906	}
844		907
845	return 0;	908	return 0;
846	}	909	}
847		910
848	static void	911	static int
849	api_ready (SV *coro)	912	api_ready (SV *coro_sv)
850	{	913	{
		914	struct coro *coro;
		915
		916	if (SvROK (coro_sv))
		917	coro_sv = SvRV (coro_sv);
		918
		919	coro = SvSTATE (coro_sv);
		920
		921	if (coro->flags & CF_READY)
		922	return 0;
		923
		924	if (coro->flags & CF_RUNNING)
		925	croak ("Coro::ready called on currently running coroutine");
		926
		927	coro->flags |= CF_READY;
		928
		929	LOCK;
851	coro_enq (SvREFCNT_inc (coro));	930	coro_enq (SvREFCNT_inc (coro_sv));
852	}	931	UNLOCK;
853		932
		933	return 1;
		934	}
		935
854	static void	936	static int
855	api_schedule (int cede)	937	api_is_ready (SV *coro_sv)
856	{	938	{
		939	return !!SvSTATE (coro_sv)->flags & CF_READY;
		940	}
		941
		942	static void
		943	prepare_schedule (struct transfer_args *ta)
		944	{
857	SV *prev, *next;	945	SV *current, *prev, *next;
858		946
859	prev = GvSV (coro_current);	947	current = GvSV (coro_current);
860		948
861	if (cede)	949	for (;;)
862	coro_enq (SvREFCNT_inc (prev));	950	{
863		951	LOCK;
864	next = coro_deq (PRIO_MIN);	952	next = coro_deq (PRIO_MIN);
		953	UNLOCK;
865		954
866	if (!next)	955	if (next)
867	next = SvREFCNT_inc (GvSV (coro_idle));	956	break;
868		957
869	GvSV (coro_current) = SvREFCNT_inc (next);	958	{
870	transfer (aTHX_	959	dSP;
871	sv_to_coro (prev, "Coro::schedule", "current coroutine"),	960
872	sv_to_coro (next, "Coro::schedule", "next coroutine"),	961	ENTER;
873	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);	962	SAVETMPS;
874	SvREFCNT_dec (next);	963
875	SvREFCNT_dec (prev);	964	PUSHMARK (SP);
		965	PUTBACK;
		966	call_sv (GvSV (coro_idle), G_DISCARD);
		967
		968	FREETMPS;
		969	LEAVE;
		970	}
		971	}
		972
		973	prev = SvRV (current);
		974	SvRV (current) = next;
		975
		976	/* free this only after the transfer */
		977	LOCK;
		978	free_coro_mortal ();
		979	UNLOCK;
		980	coro_mortal = prev;
		981
		982	ta->prev = SvSTATE (prev);
		983	ta->next = SvSTATE (next);
		984	ta->flags = TRANSFER_SAVE_ALL;
		985
		986	ta->next->flags &= ~CF_READY;
		987	}
		988
		989	static void
		990	prepare_cede (struct transfer_args *ta)
		991	{
		992	api_ready (GvSV (coro_current));
		993
		994	prepare_schedule (ta);
		995	}
		996
		997	static void
		998	api_schedule (void)
		999	{
		1000	dTHX;
		1001	struct transfer_args ta;
		1002
		1003	prepare_schedule (&ta);
		1004	TRANSFER (ta);
		1005	}
		1006
		1007	static void
		1008	api_cede (void)
		1009	{
		1010	dTHX;
		1011	struct transfer_args ta;
		1012
		1013	prepare_cede (&ta);
		1014	TRANSFER (ta);
876	}	1015	}
877		1016
878	MODULE = Coro::State PACKAGE = Coro::State	1017	MODULE = Coro::State PACKAGE = Coro::State
879		1018
880	PROTOTYPES: ENABLE	1019	PROTOTYPES: DISABLE
881		1020
882	BOOT:	1021	BOOT:
883	{ /* {} necessary for stoopid perl-5.6.x */	1022	{
884	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1023	#ifdef USE_ITHREADS
885	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1024	MUTEX_INIT (&coro_mutex);
		1025	#endif
		1026	BOOT_PAGESIZE;
		1027
886	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1028	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
887		1029
888	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1030	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
889	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1031	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
890	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1032	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		1033
896	main_mainstack = PL_mainstack;	1034	main_mainstack = PL_mainstack;
897		1035
898	coroapi.ver = CORO_API_VERSION;	1036	coroapi.ver = CORO_API_VERSION;
899	coroapi.transfer = api_transfer;	1037	coroapi.transfer = api_transfer;
900	}
901		1038
902	Coro::State	1039	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
903	_newprocess(args)	1040	}
904	SV * args	1041
905	PROTOTYPE: $	1042	SV *
		1043	new (char *klass, ...)
906	CODE:	1044	CODE:
907	Coro__State coro;	1045	{
		1046	struct coro *coro;
		1047	HV *hv;
		1048	int i;
908		1049
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);	1050	Newz (0, coro, 1, struct coro);
		1051	coro->args = newAV ();
913		1052
914	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1053	hv = newHV ();
915	coro->mainstack = 0; /* actual work is done inside transfer */	1054	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
916	coro->stack = 0;	1055	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
917		1056
918	RETVAL = coro;	1057	for (i = 1; i < items; i++)
		1058	av_push (coro->args, newSVsv (ST (i)));
		1059	}
919	OUTPUT:	1060	OUTPUT:
920	RETVAL	1061	RETVAL
921		1062
922	void	1063	void
923	transfer(prev, next, flags)	1064	_set_stacklevel (...)
924	Coro::State_or_hashref prev	1065	ALIAS:
925	Coro::State_or_hashref next	1066	Coro::State::transfer = 1
926	int flags	1067	Coro::schedule = 2
927	PROTOTYPE: @	1068	Coro::cede = 3
		1069	Coro::Cont::yield = 4
928	CODE:	1070	CODE:
929	PUTBACK;	1071	{
930	transfer (aTHX_ prev, next, flags);	1072	struct transfer_args ta;
931	SPAGAIN;	1073
		1074	switch (ix)
		1075	{
		1076	case 0:
		1077	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1078	ta.next = 0;
		1079	ta.flags = TRANSFER_SET_STACKLEVEL;
		1080	break;
		1081
		1082	case 1:
		1083	if (items != 3)
		1084	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1085
		1086	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1087	break;
		1088
		1089	case 2:
		1090	prepare_schedule (&ta);
		1091	break;
		1092
		1093	case 3:
		1094	prepare_cede (&ta);
		1095	break;
		1096
		1097	case 4:
		1098	{
		1099	SV *yieldstack;
		1100	SV *sv;
		1101	AV *defav = GvAV (PL_defgv);
		1102
		1103	yieldstack = *hv_fetch (
		1104	(HV *)SvRV (GvSV (coro_current)),
		1105	"yieldstack", sizeof ("yieldstack") - 1,
		1106	0
		1107	);
		1108
		1109	/* set up @_ -- ugly */
		1110	av_clear (defav);
		1111	av_fill (defav, items - 1);
		1112	while (items--)
		1113	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1114
		1115	sv = av_pop ((AV *)SvRV (yieldstack));
		1116	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1117	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1118	ta.flags = 0;
		1119	SvREFCNT_dec (sv);
		1120	}
		1121	break;
		1122
		1123	}
		1124
		1125	TRANSFER (ta);
		1126	}
932		1127
933	void	1128	void
934	DESTROY(coro)	1129	_clone_state_from (SV *dst, SV *src)
935	Coro::State coro	1130	CODE:
936	CODE:	1131	{
		1132	struct coro *coro_src = SvSTATE (src);
937		1133
938	if (coro->mainstack && coro->mainstack != main_mainstack)	1134	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
939	{
940	struct coro temp;
941		1135
942	PUTBACK;	1136	++coro_src->refcnt;
943	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1137	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
944	LOAD(aTHX_ coro);	1138	}
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		1139
959	void	1140	void
960	flush()
961	CODE:
962	#ifdef MAY_FLUSH
963	flush_padlist_cache ();
964	#endif
965
966	void
967	_exit(code)	1141	_exit (code)
968	int code	1142	int code
969	PROTOTYPE: $	1143	PROTOTYPE: $
970	CODE:	1144	CODE:
971	#if defined(__GLIBC__) || _POSIX_C_SOURCE
972	_exit (code);	1145	_exit (code);
973	#else
974	signal (SIGTERM, SIG_DFL);
975	raise (SIGTERM);
976	exit (code);
977	#endif
978		1146
979	MODULE = Coro::State PACKAGE = Coro::Cont	1147	int
		1148	cctx_count ()
		1149	CODE:
		1150	RETVAL = cctx_count;
		1151	OUTPUT:
		1152	RETVAL
980		1153
981	# this is slightly dirty (should expose a c-level api)	1154	int
982		1155	cctx_idle ()
983	void	1156	CODE:
984	yield(...)	1157	RETVAL = cctx_idle;
985	PROTOTYPE: @	1158	OUTPUT:
986	CODE:	1159	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		1160
1009	MODULE = Coro::State PACKAGE = Coro	1161	MODULE = Coro::State PACKAGE = Coro
1010		1162
1011	# this is slightly dirty (should expose a c-level api)
1012
1013	BOOT:	1163	BOOT:
1014	{	1164	{
1015	int i;	1165	int i;
		1166
1016	HV *stash = gv_stashpv ("Coro", TRUE);	1167	coro_stash = gv_stashpv ("Coro", TRUE);
1017		1168
1018	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1169	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1019	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1170	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1020	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1171	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1021	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1172	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1022	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1173	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1023	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1174	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1024		1175
1025	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1176	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1026	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1177	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1027		1178
1028	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1179	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1030		1181
1031	{	1182	{
1032	SV *sv = perl_get_sv("Coro::API", 1);	1183	SV *sv = perl_get_sv("Coro::API", 1);
1033		1184
1034	coroapi.schedule = api_schedule;	1185	coroapi.schedule = api_schedule;
		1186	coroapi.cede = api_cede;
1035	coroapi.ready = api_ready;	1187	coroapi.ready = api_ready;
		1188	coroapi.is_ready = api_is_ready;
1036	coroapi.nready = &coro_nready;	1189	coroapi.nready = &coro_nready;
1037	coroapi.current = coro_current;	1190	coroapi.current = coro_current;
1038		1191
1039	GCoroAPI = &coroapi;	1192	GCoroAPI = &coroapi;
1040	sv_setiv(sv, (IV)&coroapi);	1193	sv_setiv (sv, (IV)&coroapi);
1041	SvREADONLY_on(sv);	1194	SvREADONLY_on (sv);
1042	}	1195	}
1043	}	1196	}
1044		1197
1045	void	1198	int
		1199	prio (Coro::State coro, int newprio = 0)
		1200	ALIAS:
		1201	nice = 1
		1202	CODE:
		1203	{
		1204	RETVAL = coro->prio;
		1205
		1206	if (items > 1)
		1207	{
		1208	if (ix)
		1209	newprio += coro->prio;
		1210
		1211	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1212	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1213
		1214	coro->prio = newprio;
		1215	}
		1216	}
		1217
		1218	SV *
1046	ready(self)	1219	ready (SV *self)
1047	SV * self
1048	PROTOTYPE: $	1220	PROTOTYPE: $
1049	CODE:	1221	CODE:
1050	api_ready (self);	1222	RETVAL = boolSV (api_ready (self));
		1223	OUTPUT:
		1224	RETVAL
		1225
		1226	SV *
		1227	is_ready (SV *self)
		1228	PROTOTYPE: $
		1229	CODE:
		1230	RETVAL = boolSV (api_is_ready (self));
		1231	OUTPUT:
		1232	RETVAL
1051		1233
1052	int	1234	int
1053	nready(...)	1235	nready (...)
1054	PROTOTYPE:	1236	PROTOTYPE:
1055	CODE:	1237	CODE:
1056	RETVAL = coro_nready;	1238	RETVAL = coro_nready;
1057	OUTPUT:	1239	OUTPUT:
1058	RETVAL	1240	RETVAL
1059		1241
		1242	MODULE = Coro::State PACKAGE = Coro::AIO
		1243
		1244	SV *
		1245	_get_state ()
		1246	CODE:
		1247	{
		1248	struct {
		1249	int errorno;
		1250	int laststype;
		1251	int laststatval;
		1252	Stat_t statcache;
		1253	} data;
		1254
		1255	data.errorno = errno;
		1256	data.laststype = PL_laststype;
		1257	data.laststatval = PL_laststatval;
		1258	data.statcache = PL_statcache;
		1259
		1260	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1261	}
		1262	OUTPUT:
		1263	RETVAL
		1264
1060	void	1265	void
1061	schedule(...)	1266	_set_state (char *data_)
1062	PROTOTYPE:	1267	PROTOTYPE: $
1063	ALIAS:
1064	cede = 1
1065	CODE:	1268	CODE:
1066	api_schedule (ix);	1269	{
		1270	struct {
		1271	int errorno;
		1272	int laststype;
		1273	int laststatval;
		1274	Stat_t statcache;
		1275	} *data = (void *)data_;
1067		1276
		1277	errno = data->errorno;
		1278	PL_laststype = data->laststype;
		1279	PL_laststatval = data->laststatval;
		1280	PL_statcache = data->statcache;
		1281	}

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