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Comparing Coro/Coro/State.xs (file contents):
Revision 1.15 by root, Wed Jul 25 04:14:38 2001 UTC vs.
Revision 1.128 by root, Fri Dec 22 04:22:28 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
6		12
7	#ifdef HAVE_MMAP	13	#ifdef HAVE_MMAP
8	# include <unistd.h>	14	# include <unistd.h>
9	# include <sys/mman.h>	15	# include <sys/mman.h>
		16	# ifndef MAP_ANONYMOUS
		17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
		19	# else
		20	# undef HAVE_MMAP
		21	# endif
10	#endif	22	# endif
11		23	# include <limits.h>
12	#define MAY_FLUSH /* increases codesize */	24	# ifndef PAGESIZE
13		25	# define PAGESIZE pagesize
14	/* perl-related */	26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
15	#define TRANSFER_SAVE_DEFAV 0x00000001	27	static long pagesize;
16	#define TRANSFER_SAVE_DEFSV 0x00000002	28	# else
17	#define TRANSFER_SAVE_ERRSV 0x00000004	29	# define BOOT_PAGESIZE (void)0
18	/* c-related */	30	# endif
19	#define TRANSFER_SAVE_CCTXT 0x00000008
20	#ifdef CORO_LAZY_STACK
21	# define TRANSFER_LAZY_STACK 0x00000010
22	#else	31	#else
23	# define TRANSFER_LAZY_STACK 0x00000000	32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
		50	# ifndef PL_ppaddr
		51	# define PL_ppaddr ppaddr
24	#endif	52	# endif
		53	# ifndef call_sv
		54	# define call_sv perl_call_sv
		55	# endif
		56	# ifndef get_sv
		57	# define get_sv perl_get_sv
		58	# endif
		59	# ifndef get_cv
		60	# define get_cv perl_get_cv
		61	# endif
		62	# ifndef IS_PADGV
		63	# define IS_PADGV(v) 0
		64	# endif
		65	# ifndef IS_PADCONST
		66	# define IS_PADCONST(v) 0
		67	# endif
		68	#endif
25		69
26	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	70	/* 5.8.7 */
27	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
28		74
29	#define SUB_INIT "Coro::State::initialize"	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
30	#define UCORO_STATE "_coro_state"	76	# undef STACKGUARD
		77	#endif
31		78
		79	#ifndef STACKGUARD
		80	# define STACKGUARD 0
		81	#endif
		82
		83	/* prefer perl internal functions over our own? */
		84	#ifndef PREFER_PERL_FUNCTIONS
		85	# define PREFER_PERL_FUNCTIONS 0
		86	#endif
		87
32	/* The next macro should delcare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
33	* to the current C stack pointer. It's property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
34	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
35	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
36		93
37	#define labs(l) ((l) >= 0 ? (l) : -(l))	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
38		95
39	/* this is actually not only the c stack but also c registers etc... */	96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	#else
		99	# define attribute(x)
		100	#endif
		101
		102	#define NOINLINE attribute ((noinline))
		103
		104	#include "CoroAPI.h"
		105
		106	#ifdef USE_ITHREADS
		107	static perl_mutex coro_mutex;
		108	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		109	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		110	#else
		111	# define LOCK (void)0
		112	# define UNLOCK (void)0
		113	#endif
		114
		115	struct io_state
		116	{
		117	int errorno;
		118	I32 laststype;
		119	int laststatval;
		120	Stat_t statcache;
		121	};
		122
		123	static struct CoroAPI coroapi;
		124	static AV *main_mainstack; /* used to differentiate between $main and others */
		125	static HV *coro_state_stash, *coro_stash;
		126	static SV *coro_mortal; /* will be freed after next transfer */
		127
		128	static struct coro_cctx *cctx_first;
		129	static int cctx_count, cctx_idle;
		130
		131	/* this is a structure representing a c-level coroutine */
40	typedef struct {	132	typedef struct coro_cctx {
41	int refcnt; /* pointer reference counter */	133	struct coro_cctx *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		134
45	coro_context cctx;	135	/* the stack */
46
47	void *sptr;	136	void *sptr;
48	long ssize; /* positive == mmap, otherwise malloc */	137	long ssize; /* positive == mmap, otherwise malloc */
49	} coro_stack;
50		138
51	static coro_stack main_stack = { 1, 0, 0 };	139	/* cpu state */
		140	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		141	JMPENV *top_env;
		142	coro_context cctx;
52		143
		144	int inuse;
		145
		146	#if USE_VALGRIND
		147	int valgrind_id;
		148	#endif
		149	} coro_cctx;
		150
		151	enum {
		152	CF_RUNNING = 0x0001, /* coroutine is running */
		153	CF_READY = 0x0002, /* coroutine is ready */
		154	CF_NEW = 0x0004, /* ahs never been switched to */
		155	};
		156
		157	/* this is a structure representing a perl-level coroutine */
53	struct coro {	158	struct coro {
54	/* the optional C context */	159	/* the c coroutine allocated to this perl coroutine, if any */
55	coro_stack *stack;	160	coro_cctx *cctx;
56	void *cursp;
57	int gencnt;
58
59	/* optionally saved, might be zero */
60	AV *defav;
61	SV *defsv;
62	SV *errsv;
63
64	/* saved global state not related to stacks */
65	U8 dowarn;
66
67	/* the stacks and related info (callchain etc..) */
68	PERL_SI *curstackinfo;
69	AV *curstack;
70	AV *mainstack;
71	SV **stack_sp;
72	OP *op;
73	SV **curpad;
74	SV **stack_base;
75	SV **stack_max;
76	SV **tmps_stack;
77	I32 tmps_floor;
78	I32 tmps_ix;
79	I32 tmps_max;
80	I32 *markstack;
81	I32 *markstack_ptr;
82	I32 *markstack_max;
83	I32 *scopestack;
84	I32 scopestack_ix;
85	I32 scopestack_max;
86	ANY *savestack;
87	I32 savestack_ix;
88	I32 savestack_max;
89	OP **retstack;
90	I32 retstack_ix;
91	I32 retstack_max;
92	COP *curcop;
93	JMPENV start_env;
94	JMPENV *top_env;
95		161
96	/* data associated with this coroutine (initial args) */	162	/* data associated with this coroutine (initial args) */
97	AV *args;	163	AV *args;
		164	int refcnt;
		165	int save; /* CORO_SAVE flags */
		166	int flags; /* CF_ flags */
		167
		168	/* optionally saved, might be zero */
		169	AV *defav; /* @_ */
		170	SV *defsv; /* $_ */
		171	SV *errsv; /* $@ */
		172	SV *irssv; /* $/ */
		173	SV *irssv_sv; /* real $/ cache */
		174
		175	#define VAR(name,type) type name;
		176	# include "state.h"
		177	#undef VAR
		178
		179	/* coro process data */
		180	int prio;
98	};	181	};
99		182
100	typedef struct coro *Coro__State;	183	typedef struct coro *Coro__State;
101	typedef struct coro *Coro__State_or_hashref;	184	typedef struct coro *Coro__State_or_hashref;
102		185
103	static AV *main_mainstack; /* used to differentiate between $main and others */	186	static AV *
104	static HV *coro_state_stash;	187	coro_clone_padlist (CV *cv)
105	static SV *ucoro_state_sv;
106	static U32 ucoro_state_hash;
107	static HV *padlist_cache;
108
109	/* mostly copied from op.c:cv_clone2 */
110	STATIC AV *
111	clone_padlist (AV *protopadlist)
112	{	188	{
113	AV *av;	189	AV *padlist = CvPADLIST (cv);
114	I32 ix;
115	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
116	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
117	SV **pname = AvARRAY (protopad_name);
118	SV **ppad = AvARRAY (protopad);
119	I32 fname = AvFILLp (protopad_name);
120	I32 fpad = AvFILLp (protopad);
121	AV *newpadlist, *newpad_name, *newpad;	190	AV *newpadlist, *newpad;
122	SV **npad;
123
124	newpad_name = newAV ();
125	for (ix = fname; ix >= 0; ix--)
126	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
127
128	newpad = newAV ();
129	av_fill (newpad, AvFILLp (protopad));
130	npad = AvARRAY (newpad);
131		191
132	newpadlist = newAV ();	192	newpadlist = newAV ();
133	AvREAL_off (newpadlist);	193	AvREAL_off (newpadlist);
134	av_store (newpadlist, 0, (SV *) newpad_name);	194	#if PERL_VERSION_ATLEAST (5,9,0)
		195	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		196	#else
		197	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		198	#endif
		199	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		200	--AvFILLp (padlist);
		201
		202	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
135	av_store (newpadlist, 1, (SV *) newpad);	203	av_store (newpadlist, 1, (SV *)newpad);
136		204
137	av = newAV (); /* will be @_ */	205	return newpadlist;
138	av_extend (av, 0);	206	}
139	av_store (newpad, 0, (SV *) av);
140	AvFLAGS (av) = AVf_REIFY;
141		207
142	for (ix = fpad; ix > 0; ix--)	208	static void
		209	free_padlist (AV *padlist)
		210	{
		211	/* may be during global destruction */
		212	if (SvREFCNT (padlist))
143	{	213	{
144	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	214	I32 i = AvFILLp (padlist);
145	if (namesv && namesv != &PL_sv_undef)	215	while (i >= 0)
146	{	216	{
147	char *name = SvPVX (namesv); /* XXX */	217	SV **svp = av_fetch (padlist, i--, FALSE);
148	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	218	if (svp)
149	{ /* lexical from outside? */
150	npad[ix] = SvREFCNT_inc (ppad[ix]);
151	}	219	{
152	else
153	{ /* our own lexical */
154	SV *sv;	220	SV *sv;
155	if (*name == '&')	221	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
156	sv = SvREFCNT_inc (ppad[ix]);	222	SvREFCNT_dec (sv);
157	else if (*name == '@')	223
158	sv = (SV *) newAV ();	224	SvREFCNT_dec (*svp);
159	else if (*name == '%')
160	sv = (SV *) newHV ();
161	else
162	sv = NEWSV (0, 0);
163	if (!SvPADBUSY (sv))
164	SvPADMY_on (sv);
165	npad[ix] = sv;
166	}	225	}
167	}	226	}
168	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
169	{
170	npad[ix] = SvREFCNT_inc (ppad[ix]);
171	}
172	else
173	{
174	SV *sv = NEWSV (0, 0);
175	SvPADTMP_on (sv);
176	npad[ix] = sv;
177	}
178	}
179		227
180	#if 0 /* return -ENOTUNDERSTOOD */
181	/* Now that vars are all in place, clone nested closures. */
182
183	for (ix = fpad; ix > 0; ix--) {
184	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
185	if (namesv
186	&& namesv != &PL_sv_undef
187	&& !(SvFLAGS(namesv) & SVf_FAKE)
188	&& *SvPVX(namesv) == '&'
189	&& CvCLONE(ppad[ix]))
190	{
191	CV *kid = cv_clone((CV*)ppad[ix]);
192	SvREFCNT_dec(ppad[ix]);
193	CvCLONE_on(kid);
194	SvPADMY_on(kid);
195	npad[ix] = (SV*)kid;
196	}
197	}
198	#endif
199
200	return newpadlist;
201	}
202
203	#ifdef MAY_FLUSH
204	STATIC AV *
205	free_padlist (AV *padlist)
206	{
207	/* may be during global destruction */
208	if (SvREFCNT(padlist))
209	{
210	I32 i = AvFILLp(padlist);
211	while (i >= 0)
212	{
213	SV **svp = av_fetch(padlist, i--, FALSE);
214	SV *sv = svp ? *svp : Nullsv;
215	if (sv)
216	SvREFCNT_dec(sv);
217	}
218
219	SvREFCNT_dec((SV*)padlist);	228	SvREFCNT_dec ((SV*)padlist);
220	}	229	}
221	}	230	}
222	#endif	231
		232	static int
		233	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		234	{
		235	AV *padlist;
		236	AV *av = (AV *)mg->mg_obj;
		237
		238	/* casting is fun. */
		239	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		240	free_padlist (padlist);
		241
		242	SvREFCNT_dec (av);
		243
		244	return 0;
		245	}
		246
		247	#define PERL_MAGIC_coro PERL_MAGIC_ext
		248
		249	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
		250
		251	#define CORO_MAGIC(cv) \
		252	SvMAGIC (cv) \
		253	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		254	? SvMAGIC (cv) \
		255	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		256	: 0
223		257
224	/* the next two functions merely cache the padlists */	258	/* the next two functions merely cache the padlists */
225	STATIC void	259	static void
226	get_padlist (CV *cv)	260	get_padlist (CV *cv)
227	{	261	{
228	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	262	MAGIC *mg = CORO_MAGIC (cv);
		263	AV *av;
229		264
230	if (he && AvFILLp ((AV *)*he) >= 0)	265	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
231	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	266	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
232	else	267	else
		268	{
		269	#if PREFER_PERL_FUNCTIONS
		270	/* this is probably cleaner, but also slower? */
		271	CV *cp = Perl_cv_clone (cv);
		272	CvPADLIST (cv) = CvPADLIST (cp);
		273	CvPADLIST (cp) = 0;
		274	SvREFCNT_dec (cp);
		275	#else
233	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));	276	CvPADLIST (cv) = coro_clone_padlist (cv);
		277	#endif
		278	}
234	}	279	}
235		280
236	STATIC void	281	static void
237	put_padlist (CV *cv)	282	put_padlist (CV *cv)
238	{	283	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);	284	MAGIC *mg = CORO_MAGIC (cv);
		285	AV *av;
240		286
241	if (SvTYPE (*he) != SVt_PVAV)	287	if (!mg)
242	{
243	SvREFCNT_dec (*he);
244	*he = (SV *)newAV ();
245	}	288	{
246		289	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
247	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	290	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
248	}	291	mg->mg_virtual = &vtbl_coro;
249		292	mg->mg_obj = (SV *)newAV ();
250	#ifdef MAY_FLUSH
251	STATIC void
252	flush_padlist_cache ()
253	{
254	HV *hv = padlist_cache;
255	padlist_cache = newHV ();
256
257	if (hv_iterinit (hv))
258	{	293	}
259	HE *he;
260	AV *padlist;
261		294
262	while (!!(he = hv_iternext (hv)))	295	av = (AV *)mg->mg_obj;
263	{
264	AV *av = (AV *)HeVAL(he);
265		296
266	/* casting is fun. */	297	if (AvFILLp (av) >= AvMAX (av))
267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	298	av_extend (av, AvMAX (av) + 1);
268	free_padlist (padlist);
269	}
270	}
271		299
272	SvREFCNT_dec (hv);	300	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
273	}	301	}
274	#endif
275		302
276	#define SB do {	303	#define SB do {
277	#define SE } while (0)	304	#define SE } while (0)
278		305
279	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
280	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
281
282	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	306	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
283		307
284	static void	308	static void
285	load_state(pTHX_ Coro__State c)	309	load_perl (Coro__State c)
286	{	310	{
287	PL_dowarn = c->dowarn;	311	#define VAR(name,type) PL_ ## name = c->name;
288		312	# include "state.h"
289	PL_curstackinfo = c->curstackinfo;	313	#undef VAR
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_start_env = c->start_env;
315	PL_top_env = c->top_env;
316		314
317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	315	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	316	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	317	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		318	if (c->irssv)
		319	{
		320	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		321	SvREFCNT_dec (c->irssv);
		322	else
		323	{
		324	REPLACE_SV (PL_rs, c->irssv);
		325	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		326	sv_setsv (c->irssv_sv, PL_rs);
		327	}
		328	}
320		329
321	{	330	{
322	dSP;	331	dSP;
323	CV *cv;	332	CV *cv;
324		333
325	/* now do the ugly restore mess */	334	/* now do the ugly restore mess */
326	while ((cv = (CV *)POPs))	335	while ((cv = (CV *)POPs))
327	{	336	{
328	AV *padlist = (AV *)POPs;
329
330	if (padlist)
331	{
332	put_padlist (cv); /* mark this padlist as available */	337	put_padlist (cv); /* mark this padlist as available */
333	CvPADLIST(cv) = padlist;	338	CvDEPTH (cv) = PTR2IV (POPs);
334	#ifdef USE_THREADS	339	CvPADLIST (cv) = (AV *)POPs;
335	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
336	#endif
337	}
338
339	++CvDEPTH(cv);
340	}	340	}
341		341
342	PUTBACK;	342	PUTBACK;
343	}	343	}
344	}	344	}
345		345
346	static void	346	static void
347	save_state(pTHX_ Coro__State c, int flags)	347	save_perl (Coro__State c)
348	{	348	{
349	{	349	{
350	dSP;	350	dSP;
351	I32 cxix = cxstack_ix;	351	I32 cxix = cxstack_ix;
352	PERL_CONTEXT *ccstk = cxstack;	352	PERL_CONTEXT *ccstk = cxstack;
…		…
355	/*	355	/*
356	* the worst thing you can imagine happens first - we have to save	356	* the worst thing you can imagine happens first - we have to save
357	* (and reinitialize) all cv's in the whole callchain :(	357	* (and reinitialize) all cv's in the whole callchain :(
358	*/	358	*/
359		359
		360	EXTEND (SP, 3 + 1);
360	PUSHs (Nullsv);	361	PUSHs (Nullsv);
361	/* this loop was inspired by pp_caller */	362	/* this loop was inspired by pp_caller */
362	for (;;)	363	for (;;)
363	{	364	{
364	do	365	while (cxix >= 0)
365	{	366	{
366	PERL_CONTEXT *cx = &ccstk[cxix--];	367	PERL_CONTEXT *cx = &ccstk[cxix--];
367		368
368	if (CxTYPE(cx) == CXt_SUB)	369	if (CxTYPE (cx) == CXt_SUB)
369	{	370	{
370	CV *cv = cx->blk_sub.cv;	371	CV *cv = cx->blk_sub.cv;
		372
371	if (CvDEPTH(cv))	373	if (CvDEPTH (cv))
372	{	374	{
373	#ifdef USE_THREADS
374	/*XPUSHs ((SV *)CvOWNER(cv));*/
375	/*CvOWNER(cv) = 0;*/
376	/*error must unlock this cv etc.. etc...*/
377	#endif
378	EXTEND (SP, CvDEPTH(cv)*2);	375	EXTEND (SP, 3);
379
380	while (--CvDEPTH(cv))
381	{
382	/* this tells the restore code to increment CvDEPTH */
383	PUSHs (Nullsv);
384	PUSHs ((SV *)cv);
385	}
386
387	PUSHs ((SV *)CvPADLIST(cv));	376	PUSHs ((SV *)CvPADLIST (cv));
		377	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
388	PUSHs ((SV *)cv);	378	PUSHs ((SV *)cv);
389		379
		380	CvDEPTH (cv) = 0;
390	get_padlist (cv); /* this is a monster */	381	get_padlist (cv);
391	}	382	}
392	}	383	}
393	else if (CxTYPE(cx) == CXt_FORMAT)
394	{
395	/* I never used formats, so how should I know how these are implemented? */
396	/* my bold guess is as a simple, plain sub... */
397	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
398	}
399	}	384	}
400	while (cxix >= 0);
401		385
402	if (top_si->si_type == PERLSI_MAIN)	386	if (top_si->si_type == PERLSI_MAIN)
403	break;	387	break;
404		388
405	top_si = top_si->si_prev;	389	top_si = top_si->si_prev;
…		…
408	}	392	}
409		393
410	PUTBACK;	394	PUTBACK;
411	}	395	}
412		396
413	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	397	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
414	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	398	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
415	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	399	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		400	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
416		401
417	/* I have not the slightest idea of why av_reify is necessary */	402	#define VAR(name,type)c->name = PL_ ## name;
418	/* but if it's missing the defav contents magically get replaced sometimes */	403	# include "state.h"
419	if (c->defav)	404	#undef VAR
420	av_reify (c->defav);
421
422	c->dowarn = PL_dowarn;
423
424	c->curstackinfo = PL_curstackinfo;
425	c->curstack = PL_curstack;
426	c->mainstack = PL_mainstack;
427	c->stack_sp = PL_stack_sp;
428	c->op = PL_op;
429	c->curpad = PL_curpad;
430	c->stack_base = PL_stack_base;
431	c->stack_max = PL_stack_max;
432	c->tmps_stack = PL_tmps_stack;
433	c->tmps_floor = PL_tmps_floor;
434	c->tmps_ix = PL_tmps_ix;
435	c->tmps_max = PL_tmps_max;
436	c->markstack = PL_markstack;
437	c->markstack_ptr = PL_markstack_ptr;
438	c->markstack_max = PL_markstack_max;
439	c->scopestack = PL_scopestack;
440	c->scopestack_ix = PL_scopestack_ix;
441	c->scopestack_max = PL_scopestack_max;
442	c->savestack = PL_savestack;
443	c->savestack_ix = PL_savestack_ix;
444	c->savestack_max = PL_savestack_max;
445	c->retstack = PL_retstack;
446	c->retstack_ix = PL_retstack_ix;
447	c->retstack_max = PL_retstack_max;
448	c->curcop = PL_curcop;
449	c->start_env = PL_start_env;
450	c->top_env = PL_top_env;
451	}	405	}
452		406
453	/*	407	/*
454	* allocate various perl stacks. This is an exact copy	408	* allocate various perl stacks. This is an exact copy
455	* of perl.c:init_stacks, except that it uses less memory	409	* of perl.c:init_stacks, except that it uses less memory
456	* on the assumption that coroutines do not usually need	410	* on the (sometimes correct) assumption that coroutines do
457	* a lot of stackspace.	411	* not usually need a lot of stackspace.
458	*/	412	*/
459	STATIC void	413	#if PREFER_PERL_FUNCTIONS
		414	# define coro_init_stacks init_stacks
		415	#else
		416	static void
460	coro_init_stacks (pTHX)	417	coro_init_stacks ()
461	{	418	{
462	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
463	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
464	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
465	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
466		423
467	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
468	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
469	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
470		427
471	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
472	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
473	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
474	PL_tmps_max = 96;	431	PL_tmps_max = 128;
475		432
476	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
477	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
478	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
479		436
		437	#ifdef SET_MARK_OFFSET
480	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
		439	#endif
481		440
482	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
483	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
484	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
485		444
486	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
487	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
488	PL_savestack_max = 96;	447	PL_savestack_max = 64;
489		448
		449	#if !PERL_VERSION_ATLEAST (5,9,0)
490	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
491	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
492	PL_retstack_max = 8;	452	PL_retstack_max = 16;
		453	#endif
493	}	454	}
		455	#endif
494		456
495	/*	457	/*
496	* destroy the stacks, the callchain etc...	458	* destroy the stacks, the callchain etc...
497	* still there is a memleak of 128 bytes...
498	*/	459	*/
499	STATIC void	460	static void
500	destroy_stacks(pTHX)	461	coro_destroy_stacks ()
501	{	462	{
502	/* is this ugly, I ask? */	463	if (!IN_DESTRUCT)
503	while (PL_scopestack_ix)	464	{
504	LEAVE;	465	/* restore all saved variables and stuff */
		466	LEAVE_SCOPE (0);
		467	assert (PL_tmps_floor == -1);
505		468
506	/* sure it is, but more important: is it correct?? :/ */	469	/* free all temporaries */
507	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
508	FREETMPS;	470	FREETMPS;
		471	assert (PL_tmps_ix == -1);
		472
		473	POPSTACK_TO (PL_mainstack);
		474	}
509		475
510	while (PL_curstackinfo->si_next)	476	while (PL_curstackinfo->si_next)
511	PL_curstackinfo = PL_curstackinfo->si_next;	477	PL_curstackinfo = PL_curstackinfo->si_next;
512		478
513	while (PL_curstackinfo)	479	while (PL_curstackinfo)
514	{	480	{
515	PERL_SI *p = PL_curstackinfo->si_prev;	481	PERL_SI *p = PL_curstackinfo->si_prev;
516		482
517	{	483	if (!IN_DESTRUCT)
518	dSP;
519	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
520	PUTBACK; /* possibly superfluous */
521	}
522
523	dounwind(-1);
524
525	SvREFCNT_dec(PL_curstackinfo->si_stack);	484	SvREFCNT_dec (PL_curstackinfo->si_stack);
		485
526	Safefree(PL_curstackinfo->si_cxstack);	486	Safefree (PL_curstackinfo->si_cxstack);
527	Safefree(PL_curstackinfo);	487	Safefree (PL_curstackinfo);
528	PL_curstackinfo = p;	488	PL_curstackinfo = p;
529	}	489	}
530		490
531	Safefree(PL_tmps_stack);	491	Safefree (PL_tmps_stack);
532	Safefree(PL_markstack);	492	Safefree (PL_markstack);
533	Safefree(PL_scopestack);	493	Safefree (PL_scopestack);
534	Safefree(PL_savestack);	494	Safefree (PL_savestack);
		495	#if !PERL_VERSION_ATLEAST (5,9,0)
535	Safefree(PL_retstack);	496	Safefree (PL_retstack);
536	}
537
538	static void
539	allocate_stack (Coro__State ctx, int alloc)
540	{
541	coro_stack *stack;
542
543	New (0, stack, 1, coro_stack);
544
545	stack->refcnt = 1;
546	stack->usecnt = 1;
547	stack->gencnt = ctx->gencnt = 0;
548	if (alloc)
549	{
550	#ifdef HAVE_MMAP
551	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-use */
552	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
553	if (stack->sptr == (void *)-1)
554	#endif	497	#endif
555	{
556	/*FIXME*//*D*//* reasonable stack size! */
557	stack->ssize = -4096 * sizeof (long);
558	New (0, stack->sptr, 4096, long);
559	}
560	}
561	else
562	stack->sptr = 0;
563
564	ctx->stack = stack;
565	}	498	}
566		499
567	static void	500	static void
568	deallocate_stack (Coro__State ctx)	501	setup_coro (struct coro *coro)
569	{
570	coro_stack *stack = ctx->stack;
571
572	ctx->stack = 0;
573
574	if (stack)
575	{
576	if (!--stack->refcnt)
577	{
578	#ifdef HAVE_MMAP
579	if (stack->ssize > 0 && stack->sptr)
580	munmap (stack->sptr, stack->ssize);
581	else
582	#else
583	Safefree (stack->sptr);
584	#endif
585	Safefree (stack);
586	}
587	else if (ctx->gencnt == stack->gencnt)
588	--stack->usecnt;
589	}
590	}
591
592	static void
593	setup_coro (void *arg)
594	{	502	{
595	/*	503	/*
596	* emulate part of the perl startup here.	504	* emulate part of the perl startup here.
597	*/	505	*/
		506
		507	coro_init_stacks ();
		508
		509	PL_curcop = &PL_compiling;
		510	PL_in_eval = EVAL_NULL;
		511	PL_curpm = 0;
		512	PL_localizing = 0;
		513	PL_dirty = 0;
		514	PL_restartop = 0;
		515
		516	{
		517	dSP;
		518	LOGOP myop;
		519
		520	SvREFCNT_dec (GvAV (PL_defgv));
		521	GvAV (PL_defgv) = coro->args; coro->args = 0;
		522
		523	Zero (&myop, 1, LOGOP);
		524	myop.op_next = Nullop;
		525	myop.op_flags = OPf_WANT_VOID;
		526
		527	PUSHMARK (SP);
		528	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		529	PUTBACK;
		530	PL_op = (OP *)&myop;
		531	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		532	SPAGAIN;
		533	}
		534
		535	ENTER; /* necessary e.g. for dounwind */
		536	}
		537
		538	static void
		539	free_coro_mortal ()
		540	{
		541	if (coro_mortal)
		542	{
		543	SvREFCNT_dec (coro_mortal);
		544	coro_mortal = 0;
		545	}
		546	}
		547
		548	/* inject a fake call to Coro::State::_cctx_init into the execution */
		549	static void NOINLINE
		550	prepare_cctx (coro_cctx *cctx)
		551	{
598	dSP;	552	dSP;
599	Coro__State ctx = (Coro__State)arg;	553	LOGOP myop;
600	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
601		554
602	coro_init_stacks (aTHX);	555	Zero (&myop, 1, LOGOP);
603	JMPENV_BOOTSTRAP;	556	myop.op_next = PL_op;
		557	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		558
		559	PUSHMARK (SP);
		560	EXTEND (SP, 2);
		561	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		562	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		563	PUTBACK;
		564	PL_op = (OP *)&myop;
		565	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
604	SPAGAIN;	566	SPAGAIN;
605
606	/*PL_curcop = 0;*/
607	SvREFCNT_dec (GvAV (PL_defgv));
608	GvAV (PL_defgv) = ctx->args;
609
610	if (ctx->stack)
611	{
612	ctx->cursp = 0;
613
614	PUSHMARK(SP);
615	PUTBACK;
616	(void) call_sv (sub_init, G_VOID|G_NOARGS);
617	croak ("FATAL: CCTXT coroutine returned!");
618	}
619	else
620	{
621	UNOP myop;
622
623	PL_op = (OP *)&myop;
624
625	Zero(&myop, 1, UNOP);
626	myop.op_next = Nullop;
627	myop.op_flags = OPf_WANT_VOID;
628
629	PUSHMARK(SP);
630	XPUSHs (sub_init);
631	/*
632	* the next line is slightly wrong, as PL_op->op_next
633	* is actually being executed so we skip the first op.
634	* that doesn't matter, though, since it is only
635	* pp_nextstate and we never return...
636	* ah yes, and I don't care anyways ;)
637	*/
638	PUTBACK;
639	PL_op = pp_entersub();
640	SPAGAIN;
641
642	ENTER; /* necessary e.g. for dounwind */
643	}
644	}	567	}
645		568
646	static void	569	static void
647	continue_coro (void *arg)	570	coro_run (void *arg)
648	{	571	{
		572	/* coro_run is the alternative tail of transfer(), so unlock here. */
		573	UNLOCK;
		574
649	/*	575	/*
650	* this is a _very_ stripped down perl interpreter ;)	576	* this is a _very_ stripped down perl interpreter ;)
651	*/	577	*/
652	Coro__State ctx = (Coro__State)arg;	578	PL_top_env = &PL_start_env;
653		579
654	ctx->cursp = 0;	580	/* inject call to cctx_init */
655	PL_op = PL_op->op_next;	581	prepare_cctx ((coro_cctx *)arg);
656	CALLRUNOPS(aTHX);	582
657	/*NORETURN*/	583	/* somebody will hit me for both perl_run and PL_restartop */
		584	PL_restartop = PL_op;
		585	perl_run (PL_curinterp);
		586
		587	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
658	abort ();	588	abort ();
659	}	589	}
660		590
661	STATIC void	591	static coro_cctx *
		592	cctx_new ()
		593	{
		594	coro_cctx *cctx;
		595
		596	++cctx_count;
		597
		598	Newz (0, cctx, 1, coro_cctx);
		599
		600	#if HAVE_MMAP
		601
		602	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		603	/* mmap supposedly does allocate-on-write for us */
		604	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		605
		606	if (cctx->sptr == (void *)-1)
		607	{
		608	perror ("FATAL: unable to mmap stack for coroutine");
		609	_exit (EXIT_FAILURE);
		610	}
		611
		612	# if STACKGUARD
		613	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		614	# endif
		615
		616	#else
		617
		618	cctx->ssize = STACKSIZE * (long)sizeof (long);
		619	New (0, cctx->sptr, STACKSIZE, long);
		620
		621	if (!cctx->sptr)
		622	{
		623	perror ("FATAL: unable to malloc stack for coroutine");
		624	_exit (EXIT_FAILURE);
		625	}
		626
		627	#endif
		628
		629	#if USE_VALGRIND
		630	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		631	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		632	cctx->ssize + (char *)cctx->sptr
		633	);
		634	#endif
		635
		636	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		637
		638	return cctx;
		639	}
		640
		641	static void
		642	cctx_destroy (coro_cctx *cctx)
		643	{
		644	if (!cctx)
		645	return;
		646
		647	--cctx_count;
		648
		649	#if USE_VALGRIND
		650	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		651	#endif
		652
		653	#if HAVE_MMAP
		654	munmap (cctx->sptr, cctx->ssize);
		655	#else
		656	Safefree (cctx->sptr);
		657	#endif
		658
		659	Safefree (cctx);
		660	}
		661
		662	static coro_cctx *
		663	cctx_get ()
		664	{
		665	coro_cctx *cctx;
		666
		667	if (cctx_first)
		668	{
		669	cctx = cctx_first;
		670	cctx_first = cctx->next;
		671	--cctx_idle;
		672	}
		673	else
		674	{
		675	cctx = cctx_new ();
		676	PL_op = PL_op->op_next;
		677	}
		678
		679	return cctx;
		680	}
		681
		682	static void
		683	cctx_put (coro_cctx *cctx)
		684	{
		685	/* free another cctx if overlimit */
		686	if (cctx_idle >= MAX_IDLE_CCTX)
		687	{
		688	coro_cctx *first = cctx_first;
		689	cctx_first = first->next;
		690	--cctx_idle;
		691
		692	assert (!first->inuse);
		693	cctx_destroy (first);
		694	}
		695
		696	++cctx_idle;
		697	cctx->next = cctx_first;
		698	cctx_first = cctx;
		699	}
		700
		701	/* never call directly, always through the coro_state_transfer global variable */
		702	static void NOINLINE
662	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	703	transfer (struct coro *prev, struct coro *next)
663	{	704	{
664	dSP;
665	dSTACKLEVEL;	705	dSTACKLEVEL;
666		706
		707	/* sometimes transfer is only called to set idle_sp */
		708	if (!next)
		709	{
		710	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		711	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		712	}
667	if (prev != next)	713	else if (prev != next)
668	{	714	{
669	if (next->mainstack)	715	coro_cctx *prev__cctx;
		716
		717	if (prev->flags & CF_NEW)
670	{	718	{
671	SAVE (prev, flags);	719	/* create a new empty context */
672	LOAD (next);	720	Newz (0, prev->cctx, 1, coro_cctx);
673		721	prev->cctx->inuse = 1;
674	/* mark this state as in-use */	722	prev->flags &= ~CF_NEW;
675	next->mainstack = 0;	723	prev->flags |= CF_RUNNING;
676	next->tmps_ix = -2;
677
678	/* stacklevel changed? if yes, grab the stack for us! */
679	if (flags & TRANSFER_SAVE_CCTXT)
680	{
681	if (!prev->stack)
682	allocate_stack (prev, 0);
683	else if (prev->cursp != stacklevel
684	&& prev->stack->usecnt > 1)
685	{
686	prev->gencnt = ++prev->stack->gencnt;
687	prev->stack->usecnt = 1;
688	}
689
690	/* has our stack been invalidated? */
691	if (next->stack && next->stack->gencnt != next->gencnt)
692	{
693	deallocate_stack (next);
694	allocate_stack (next, 1);
695	coro_create (&(next->stack->cctx),
696	continue_coro, (void *)next,
697	next->stack->sptr, labs (next->stack->ssize));
698	}
699
700	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
701	}
702
703	}	724	}
704	else if (next->tmps_ix == -2)	725
705	croak ("tried to transfer to running coroutine");	726	/*TODO: must not croak here */
		727	if (!prev->flags & CF_RUNNING)
		728	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		729
		730	if (next->flags & CF_RUNNING)
		731	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		732
		733	prev->flags &= ~CF_RUNNING;
		734	next->flags |= CF_RUNNING;
		735
		736	LOCK;
		737
		738	if (next->flags & CF_NEW)
		739	{
		740	/* need to start coroutine */
		741	next->flags &= ~CF_NEW;
		742	/* first get rid of the old state */
		743	save_perl (prev);
		744	/* setup coroutine call */
		745	setup_coro (next);
		746	/* need a new stack */
		747	assert (!next->cctx);
		748	}
706	else	749	else
707	{	750	{
708	SAVE (prev, -1); /* first get rid of the old state */	751	/* coroutine already started */
709		752	save_perl (prev);
710	if (flags & TRANSFER_SAVE_CCTXT)	753	load_perl (next);
711	{
712	if (!prev->stack)
713	allocate_stack (prev, 0);
714
715	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
716	{
717	setup_coro (next);
718
719	prev->stack->refcnt++;
720	prev->stack->usecnt++;
721	next->stack = prev->stack;
722	next->gencnt = prev->gencnt;
723	}
724	else
725	{
726	allocate_stack (next, 1);
727	coro_create (&(next->stack->cctx),
728	setup_coro, (void *)next,
729	next->stack->sptr, labs (next->stack->ssize));
730	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
731	}
732	}
733	else
734	setup_coro (next);
735	}	754	}
		755
		756	prev__cctx = prev->cctx;
		757
		758	/* possibly "free" the cctx */
		759	if (prev__cctx->idle_sp == STACKLEVEL)
		760	{
		761	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		762	assert (PL_top_env == prev__cctx->top_env);
		763
		764	prev->cctx = 0;
		765
		766	cctx_put (prev__cctx);
		767	prev__cctx->inuse = 0;
		768	}
		769
		770	if (!next->cctx)
		771	{
		772	next->cctx = cctx_get ();
		773	assert (!next->cctx->inuse);
		774	next->cctx->inuse = 1;
		775	}
		776
		777	if (prev__cctx != next->cctx)
		778	{
		779	prev__cctx->top_env = PL_top_env;
		780	PL_top_env = next->cctx->top_env;
		781	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		782	}
		783
		784	free_coro_mortal ();
		785
		786	UNLOCK;
		787	}
		788	}
		789
		790	struct transfer_args
		791	{
		792	struct coro *prev, *next;
		793	};
		794
		795	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		796
		797	static void
		798	coro_state_destroy (struct coro *coro)
		799	{
		800	if (coro->refcnt--)
		801	return;
		802
		803	if (coro->mainstack && coro->mainstack != main_mainstack)
		804	{
		805	struct coro temp;
		806	Zero (&temp, 1, struct coro);
		807	temp.save = CORO_SAVE_ALL;
		808
		809	if (coro->flags & CF_RUNNING)
		810	croak ("FATAL: tried to destroy currently running coroutine");
		811
		812	save_perl (&temp);
		813	load_perl (coro);
		814
		815	coro_destroy_stacks ();
		816
		817	load_perl (&temp); /* this will get rid of defsv etc.. */
		818
		819	coro->mainstack = 0;
		820	}
		821
		822	cctx_destroy (coro->cctx);
		823	SvREFCNT_dec (coro->args);
		824	Safefree (coro);
		825	}
		826
		827	static int
		828	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		829	{
		830	struct coro *coro = (struct coro *)mg->mg_ptr;
		831	mg->mg_ptr = 0;
		832
		833	coro_state_destroy (coro);
		834
		835	return 0;
		836	}
		837
		838	static int
		839	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		840	{
		841	struct coro *coro = (struct coro *)mg->mg_ptr;
		842
		843	++coro->refcnt;
		844
		845	return 0;
		846	}
		847
		848	static MGVTBL coro_state_vtbl = {
		849	0, 0, 0, 0,
		850	coro_state_clear,
		851	0,
		852	#ifdef MGf_DUP
		853	coro_state_dup,
		854	#else
		855	# define MGf_DUP 0
		856	#endif
		857	};
		858
		859	static struct coro *
		860	SvSTATE (SV *coro)
		861	{
		862	HV *stash;
		863	MAGIC *mg;
		864
		865	if (SvROK (coro))
		866	coro = SvRV (coro);
		867
		868	stash = SvSTASH (coro);
		869	if (stash != coro_stash && stash != coro_state_stash)
		870	{
		871	/* very slow, but rare, check */
		872	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		873	croak ("Coro::State object required");
		874	}
		875
		876	mg = SvMAGIC (coro);
		877	assert (mg->mg_type == PERL_MAGIC_ext);
		878	return (struct coro *)mg->mg_ptr;
		879	}
		880
		881	static void
		882	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		883	{
		884	ta->prev = SvSTATE (prev_sv);
		885	ta->next = SvSTATE (next_sv);
		886	}
		887
		888	static void
		889	api_transfer (SV *prev_sv, SV *next_sv)
		890	{
		891	struct transfer_args ta;
		892
		893	prepare_transfer (&ta, prev_sv, next_sv);
		894	TRANSFER (ta);
		895	}
		896
		897	static int
		898	api_save (SV *coro_sv, int new_save)
		899	{
		900	struct coro *coro = SvSTATE (coro_sv);
		901	int old_save = coro->save;
		902
		903	if (new_save >= 0)
		904	coro->save = new_save;
		905
		906	return old_save;
		907	}
		908
		909	/** Coro ********************************************************************/
		910
		911	#define PRIO_MAX 3
		912	#define PRIO_HIGH 1
		913	#define PRIO_NORMAL 0
		914	#define PRIO_LOW -1
		915	#define PRIO_IDLE -3
		916	#define PRIO_MIN -4
		917
		918	/* for Coro.pm */
		919	static SV *coro_current;
		920	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		921	static int coro_nready;
		922
		923	static void
		924	coro_enq (SV *coro_sv)
		925	{
		926	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		927	coro_nready++;
		928	}
		929
		930	static SV *
		931	coro_deq (int min_prio)
		932	{
		933	int prio = PRIO_MAX - PRIO_MIN;
		934
		935	min_prio -= PRIO_MIN;
		936	if (min_prio < 0)
		937	min_prio = 0;
		938
		939	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		940	if (AvFILLp (coro_ready [prio]) >= 0)
		941	{
		942	coro_nready--;
		943	return av_shift (coro_ready [prio]);
736	}	944	}
737		945
738	next->cursp = stacklevel;	946	return 0;
		947	}
		948
		949	static int
		950	api_ready (SV *coro_sv)
		951	{
		952	struct coro *coro;
		953
		954	if (SvROK (coro_sv))
		955	coro_sv = SvRV (coro_sv);
		956
		957	coro = SvSTATE (coro_sv);
		958
		959	if (coro->flags & CF_READY)
		960	return 0;
		961
		962	coro->flags |= CF_READY;
		963
		964	LOCK;
		965	coro_enq (SvREFCNT_inc (coro_sv));
		966	UNLOCK;
		967
		968	return 1;
		969	}
		970
		971	static int
		972	api_is_ready (SV *coro_sv)
		973	{
		974	return !!SvSTATE (coro_sv)->flags & CF_READY;
		975	}
		976
		977	static void
		978	prepare_schedule (struct transfer_args *ta)
		979	{
		980	SV *prev, *next;
		981
		982	for (;;)
		983	{
		984	LOCK;
		985	next = coro_deq (PRIO_MIN);
		986	UNLOCK;
		987
		988	if (next)
		989	break;
		990
		991	{
		992	dSP;
		993
		994	ENTER;
		995	SAVETMPS;
		996
		997	PUSHMARK (SP);
		998	PUTBACK;
		999	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1000
		1001	FREETMPS;
		1002	LEAVE;
		1003	}
		1004	}
		1005
		1006	prev = SvRV (coro_current);
		1007	SvRV_set (coro_current, next);
		1008
		1009	/* free this only after the transfer */
		1010	LOCK;
		1011	free_coro_mortal ();
		1012	UNLOCK;
		1013	coro_mortal = prev;
		1014
		1015	assert (!SvROK(prev));//D
		1016	assert (!SvROK(next));//D
		1017
		1018	ta->prev = SvSTATE (prev);
		1019	ta->next = SvSTATE (next);
		1020
		1021	assert (ta->next->flags & CF_READY);
		1022	ta->next->flags &= ~CF_READY;
		1023	}
		1024
		1025	static void
		1026	prepare_cede (struct transfer_args *ta)
		1027	{
		1028	api_ready (coro_current);
		1029
		1030	prepare_schedule (ta);
		1031	}
		1032
		1033	static void
		1034	api_schedule (void)
		1035	{
		1036	struct transfer_args ta;
		1037
		1038	prepare_schedule (&ta);
		1039	TRANSFER (ta);
		1040	}
		1041
		1042	static void
		1043	api_cede (void)
		1044	{
		1045	struct transfer_args ta;
		1046
		1047	prepare_cede (&ta);
		1048	TRANSFER (ta);
739	}	1049	}
740		1050
741	MODULE = Coro::State PACKAGE = Coro::State	1051	MODULE = Coro::State PACKAGE = Coro::State
742		1052
743	PROTOTYPES: ENABLE	1053	PROTOTYPES: DISABLE
744		1054
745	BOOT:	1055	BOOT:
746	{ /* {} necessary for stoopid perl-5.6.x */	1056	{
747	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1057	#ifdef USE_ITHREADS
748	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1058	MUTEX_INIT (&coro_mutex);
		1059	#endif
		1060	BOOT_PAGESIZE;
		1061
749	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1062	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
750		1063
751	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1064	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
752	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1065	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
753	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1066	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1067	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
754	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1068	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
755
756	if (!padlist_cache)
757	padlist_cache = newHV ();
758		1069
759	main_mainstack = PL_mainstack;	1070	main_mainstack = PL_mainstack;
760	}
761		1071
762	Coro::State	1072	coroapi.ver = CORO_API_VERSION;
763	_newprocess(args)	1073	coroapi.transfer = api_transfer;
764	SV * args	1074
765	PROTOTYPE: $	1075	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1076	}
		1077
		1078	SV *
		1079	new (char *klass, ...)
766	CODE:	1080	CODE:
767	Coro__State coro;	1081	{
		1082	struct coro *coro;
		1083	HV *hv;
		1084	int i;
768		1085
769	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
770	croak ("Coro::State::_newprocess expects an arrayref");
771
772	New (0, coro, 1, struct coro);	1086	Newz (0, coro, 1, struct coro);
		1087	coro->args = newAV ();
		1088	coro->save = CORO_SAVE_ALL;
		1089	coro->flags = CF_NEW;
773		1090
774	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1091	hv = newHV ();
775	coro->mainstack = 0; /* actual work is done inside transfer */	1092	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
776	coro->stack = 0;	1093	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
777		1094
778	RETVAL = coro;	1095	for (i = 1; i < items; i++)
		1096	av_push (coro->args, newSVsv (ST (i)));
		1097	}
779	OUTPUT:	1098	OUTPUT:
780	RETVAL	1099	RETVAL
781		1100
		1101	int
		1102	save (SV *coro, int new_save = -1)
		1103	CODE:
		1104	RETVAL = api_save (coro, new_save);
		1105	OUTPUT:
		1106	RETVAL
		1107
782	void	1108	void
783	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1109	_set_stacklevel (...)
784	Coro::State_or_hashref prev	1110	ALIAS:
785	Coro::State_or_hashref next	1111	Coro::State::transfer = 1
786	int flags	1112	Coro::schedule = 2
787	PROTOTYPE: @	1113	Coro::cede = 3
788	CODE:	1114	CODE:
789	transfer (aTHX_ prev, next, flags);	1115	{
		1116	struct transfer_args ta;
		1117
		1118	switch (ix)
		1119	{
		1120	case 0:
		1121	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1122	ta.next = 0;
		1123	break;
		1124
		1125	case 1:
		1126	if (items != 2)
		1127	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1128
		1129	prepare_transfer (&ta, ST (0), ST (1));
		1130	break;
		1131
		1132	case 2:
		1133	prepare_schedule (&ta);
		1134	break;
		1135
		1136	case 3:
		1137	prepare_cede (&ta);
		1138	break;
		1139	}
		1140
		1141	TRANSFER (ta);
		1142	}
790		1143
791	void	1144	void
792	DESTROY(coro)	1145	_clone_state_from (SV *dst, SV *src)
793	Coro::State coro	1146	CODE:
		1147	{
		1148	struct coro *coro_src = SvSTATE (src);
		1149
		1150	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1151
		1152	++coro_src->refcnt;
		1153	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1154	}
		1155
		1156	void
		1157	_exit (code)
		1158	int code
		1159	PROTOTYPE: $
		1160	CODE:
		1161	_exit (code);
		1162
		1163	int
		1164	cctx_count ()
		1165	CODE:
		1166	RETVAL = cctx_count;
		1167	OUTPUT:
		1168	RETVAL
		1169
		1170	int
		1171	cctx_idle ()
		1172	CODE:
		1173	RETVAL = cctx_idle;
		1174	OUTPUT:
		1175	RETVAL
		1176
		1177	MODULE = Coro::State PACKAGE = Coro
		1178
		1179	BOOT:
		1180	{
		1181	int i;
		1182
		1183	coro_stash = gv_stashpv ("Coro", TRUE);
		1184
		1185	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1186	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1187	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1188	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1189	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1190	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1191
		1192	coro_current = get_sv ("Coro::current", FALSE);
		1193	SvREADONLY_on (coro_current);
		1194
		1195	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1196	coro_ready[i] = newAV ();
		1197
		1198	{
		1199	SV *sv = perl_get_sv("Coro::API", 1);
		1200
		1201	coroapi.schedule = api_schedule;
		1202	coroapi.save = api_save;
		1203	coroapi.cede = api_cede;
		1204	coroapi.ready = api_ready;
		1205	coroapi.is_ready = api_is_ready;
		1206	coroapi.nready = &coro_nready;
		1207	coroapi.current = coro_current;
		1208
		1209	GCoroAPI = &coroapi;
		1210	sv_setiv (sv, (IV)&coroapi);
		1211	SvREADONLY_on (sv);
		1212	}
		1213	}
		1214
		1215	void
		1216	_set_current (SV *current)
		1217	PROTOTYPE: $
		1218	CODE:
		1219	SvREFCNT_dec (SvRV (coro_current));
		1220	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1221
		1222	int
		1223	prio (Coro::State coro, int newprio = 0)
		1224	ALIAS:
		1225	nice = 1
794	CODE:	1226	CODE:
		1227	{
		1228	RETVAL = coro->prio;
795		1229
796	if (coro->mainstack && coro->mainstack != main_mainstack)	1230	if (items > 1)
797	{	1231	{
798	struct coro temp;	1232	if (ix)
		1233	newprio += coro->prio;
799		1234
800	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1235	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
801	LOAD(aTHX_ coro);	1236	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
802		1237
803	destroy_stacks (aTHX);	1238	coro->prio = newprio;
804
805	LOAD((&temp)); /* this will get rid of defsv etc.. */
806
807	coro->mainstack = 0;
808	}	1239	}
		1240	}
809		1241
810	deallocate_stack (coro);	1242	SV *
		1243	ready (SV *self)
		1244	PROTOTYPE: $
		1245	CODE:
		1246	RETVAL = boolSV (api_ready (self));
		1247	OUTPUT:
		1248	RETVAL
811		1249
812	Safefree (coro);	1250	SV *
		1251	is_ready (SV *self)
		1252	PROTOTYPE: $
		1253	CODE:
		1254	RETVAL = boolSV (api_is_ready (self));
		1255	OUTPUT:
		1256	RETVAL
		1257
		1258	int
		1259	nready (...)
		1260	PROTOTYPE:
		1261	CODE:
		1262	RETVAL = coro_nready;
		1263	OUTPUT:
		1264	RETVAL
		1265
		1266	MODULE = Coro::State PACKAGE = Coro::AIO
		1267
		1268	SV *
		1269	_get_state ()
		1270	CODE:
		1271	{
		1272	struct io_state *data;
		1273
		1274	RETVAL = newSV (sizeof (struct io_state));
		1275	data = (struct io_state *)SvPVX (RETVAL);
		1276	SvCUR_set (RETVAL, sizeof (struct io_state));
		1277	SvPOK_only (RETVAL);
		1278
		1279	data->errorno = errno;
		1280	data->laststype = PL_laststype;
		1281	data->laststatval = PL_laststatval;
		1282	data->statcache = PL_statcache;
		1283	}
		1284	OUTPUT:
		1285	RETVAL
813		1286
814	void	1287	void
815	flush()	1288	_set_state (char *data_)
		1289	PROTOTYPE: $
816	CODE:	1290	CODE:
817	#ifdef MAY_FLUSH	1291	{
818	flush_padlist_cache ();	1292	struct io_state *data = (void *)data_;
819	#endif
820		1293
821	MODULE = Coro::State PACKAGE = Coro::Cont	1294	errno = data->errorno;
		1295	PL_laststype = data->laststype;
		1296	PL_laststatval = data->laststatval;
		1297	PL_statcache = data->statcache;
		1298	}
822		1299
823	# this is slightly dirty
824
825	void
826	yield(...)
827	PROTOTYPE: @
828	CODE:
829	static SV *returnstk;
830	SV *sv;
831	AV *defav = GvAV (PL_defgv);
832	struct coro *prev, *next;
833
834	if (!returnstk)
835	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
836
837	/* set up @_ -- ugly */
838	av_clear (defav);
839	av_fill (defav, items - 1);
840	while (items--)
841	av_store (defav, items, SvREFCNT_inc (ST(items)));
842
843	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
844	sv = av_pop ((AV *)SvRV (returnstk));
845	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
846	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
847	SvREFCNT_dec (sv);
848
849	transfer(aTHX_ prev, next, 0);
850

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